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    hydraulic composition with extended opening time. the presently described and claimed concepts of the invention generally relate to a hydraulic composition with an extended opening time. more particularly, the composition comprises at least one cement retarder and at least one accelerator. the concepts of the invention presently described and claimed further refer to a dry mortar composition comprising the hydraulic composition having prolonged opening time without deterioration of the other properties of cement tile glue, such as workability, adjustment time, development of the resistance and resistance to sag.
    公开号:BR112015022627B1
    申请号:R112015022627-2
    申请日:2014-03-13
    公开日:2021-08-17
    发明作者:Wilfried Adolf Hohn；Stefan Hucko；Alexander Adolphe Kindler；Vera Louise Nilles；Martin Wunderlich
    申请人:Hercules Incorporated；
    IPC主号:
    专利说明:

    CROSS REFERENCE TO RELATED ORDERS
    [001] The present application claims benefit under 35 U.S.C. 119(e) of U.S. Provisional Patent Application Serial No. 61/787,219, filed March 15, 2013, the entire contents of which are expressly incorporated herein by reference. BACKGROUND OF THE INVENTION 1. Field of Invention Concepts Presently Described and Claimed
    [002] The concepts of the invention presently described and claimed refer generally to a hydraulic composition with an extended opening time. More particularly, the composition comprises at least one cement retarder and at least one accelerator. The concepts of the invention presently described and claimed further refer to a dry mortar composition comprising the hydraulic composition having prolonged opening time without deterioration of other cement tile glue properties, such as workability, adjustment time, development of the resistance and resistance to sag. 2. Background and Applicable Aspects of the Concepts of the Invention Presently Described and Claimed
    [003] Shingles have long been used as a finishing material for the construction of buildings with a beautiful external appearance, for installation convenience, hygienic properties, convenience for cleaning, maintenance, and building management, and the like.
    [004] Traditional cement tile glues (CTA) used to be simple dry mixes and sand. The dry mix is mixed with water to form a wet mortar. These traditional mortars, by themselves, have poor fluidity or trowel capacity. Therefore, the application of these mortars is labor intensive.
    [005] Furthermore, the evaporation of water into the air and especially the absorption of water through porous substrates, on which CTA is applied, leads to a depletion of water in the wet mortar over time. Consequently, not enough water remains in the mortar resulting in a very short opening time, correction time and even problems with adhesion to the substrate. Furthermore, a lack of sufficient water for proper hydration of cement results in insufficient and incomplete strength development of the CTA.
    [006] Nowadays, in general, cellulose ethers are added to mortar to reduce water loss due to evaporation and absorption of the substrate. Cellulose ethers provide water retention, thus water loss is strongly diminished but not completely prevented. However, constant workability, acceptable correction and especially suitable opening time and strength development are provided.
    [007] The opening time of a mortar is the time in which a tile can still be placed in the applied mortar and sufficient wetting of the tile with tile glue is ensured. The end of the opening time is indicated by having insufficient CTA wetting at the back of the tile. Opening time is limited due to drying as well as other chemical and physical reactions related to the cement set and effects of other additives used such as cellulose ethers and redispersible polymer powders.
    [008] A method of extending the opening time by adding hydration retarders from organic and/or inorganic cements to a cementitious mortar has been widely used. By adding retarders, hydration reactions are slowed down or slowed down. Therefore, the setting and hardening of the mortar are displaced and the opening time is prolonged.
    [009] Adjustment time is defined in ASTM C266-65. Basically, setting time is the time it takes for a mortar to harden or be set to a certain thickness. For construction using a cement-based hydraulic composition, such as mortar or concrete, set-up time control is desired with a view to ensuring feasibility, shortening construction time and simplifying installation curing. As demand for a tuning throttle effect, in particular, is growing in order to shorten the build time, a tuning throttle having a high tuning throttle effect is being developed.
    [010] The delay in cement hydration reactions and, consequently, in the setting time, in general, comes along with the development of decreased strength. Generally speaking, the slower the hydration of the cement, that is, the longer the adjustment time, the greater the risk of water loss and, thus, the development of insufficient strength.
    [011] If a cement tile glue has a long opening time with the addition of a cement retarder, the long opening time is established. However, the adjustment time is undesirably prolonged. Thus, there is a need to have a cement tile glue that has a long opening time with a comparable setting time.
    [012] Surprisingly, it has been found that the positive gain in opening time by using a cement retarder is not reversed if an accelerator is added to compensate for the delay of the cement set. It has further been found that a retarder-accelerator combination can generate a synergistic effect, meaning that the combination may still have a longer opening time compared to a retarder alone. DETAILED DESCRIPTION
    [013] Before explaining at least one modality of the concepts of the invention, in detail, through the exemplary drawings, experimentation, results and laboratory procedures, it is to be understood that the concepts of the invention are not limited in their application to the construction details and the arrangement of components determined in the following description or illustrated in the drawings, experimentation and/or results. The concepts of the invention are capable of other modalities or of being practiced or realized in various ways. As such, the language used here is intended to determine the widest possible scope and meaning; and the modalities are intended to be exemplary - non-exhaustive. Also, it is to be understood that the phraseology and terminology employed herein is for the purpose of description and should not be considered limiting.
    [014] Unless otherwise defined, scientific and technical terms used in conjunction with the concepts of the invention herein described and claimed shall have the meanings that are commonly understood by those skilled in the art. In addition, unless otherwise required by the context, singular terms must include pluralities and plural terms must include the singular. Generally, the nomenclatures used in conjunction with and the chemistry techniques described herein are those well known and commonly used in the art. Reactions and purification techniques are carried out in accordance with the manufacturer's specifications or as commonly performed in the art or as described herein. The nomenclatures used in conjunction with, and laboratory procedures and techniques of analytical chemistry, synthetic organic chemistry, and medicinal and pharmaceutical chemistry, described herein, are those well known and commonly used in the art. Standard techniques are used for chemical syntheses, chemical analysis, pharmaceutical preparation, formulation, and distribution, and patient care.
    [015] All patents, published patent applications, and non-patent publications mentioned in the specification are indicative of the skill level of those skilled in the art to which these presently described and claimed invention concepts belong. All patents, published patent applications, and non-patent publications referenced anywhere in this application are expressly incorporated herein by reference in their entirety to the same extent as if each individual patent or publication were specifically and individually indicated to be incorporated by reference.
    [016] All compositions and/or methods described and claimed herein can be made and performed without undue experimentation in light of the present description. While the compositions and methods of this invention have been described in terms of preferred embodiments, it will be apparent to those skilled in the art that variations can be applied to the compositions and/or methods and the steps, or sequence of steps, of the method described herein without departing from the concept, spirit and scope of the invention. All such similar substitutes and apparent modifications to those skilled in the art are considered to be within the spirit, scope and concept of the concepts of the invention as defined by the appended claims.
    [017] As used in accordance with the present description, the following terms, unless otherwise indicated, shall be understood to have the following meanings:
    [018] The use of the word "a" or "an" when used in conjunction with the term "comprising" in the claims and/or the specification may mean "one", but is also consistent with the meaning of "one or more ", "at least one", and "one or more than one". The use of the term "or" in the claims is used to mean "and/or" unless explicitly stated to refer only to alternatives or the alternatives are mutually exclusive, although the description supports a definition referring to only alternatives and "and /or". Throughout this application, the term "about" is used to indicate that a value includes the inherent variation of error for the device, the method being employed to determine the value, and/or the variation that exists among study subjects. The use of the term "at least one" will be understood to include one, as well as any amount more than one, including, but not limited to, 2, 3, 4, 5, 10, 15, 20, 30, 40, 50 , 100, etc. The term "at least one" can extend to 100 or 1000 or more, depending on the period for which it is linked; moreover, quantities of 100/1000 should not be considered as limiting, as higher limits can also produce satisfactory results. Furthermore, the use of the term "at least one of X, Y, and Z" will be understood to include X alone, Y alone, and Z alone, as well as any combination of X, Y, and Z.
    [019] As used in this specification and claims, the words "comprising" (and any form of comprising, such as "comprise" and "comprises"), "having" (and any form of having, such as "have" and "has"), "including" (and any form of including, such as "includes" and "includes") or "containing" (and any form of containing, such as "contains" and "contains") are included steps. , or open-ended and do not exclude, additional, unrecited elements or method.
    [020] The term "or combinations thereof" as used herein refers to all permutations and combinations of the items listed prior to the term. For example, "A, B, C or combinations thereof" is intended to include at least one of: A, B, C, AB, AC, BC, or ABC, and whether the order is important in a context particular, also BA, CA, CB, CBA, BCA, ACB, BAC, or CAB. Continuing with this example, expressly included are combinations that contain repetitions of one or more item or term, such as BB, AAA, MB, BBC, AAABCCCC, CBBAAA, CABABB, and so on. The person skilled in the art will understand that there is typically no limit on the number of items or terms in any combination, unless otherwise apparent from the context.
    [021] Described here is a hydraulic composition with extended opening time. Hydraulic compounding can be used in making a cement mortar as a cement tile glue. Specifically, the hydraulic composition comprises at least one cement retarder and at least one accelerator.
    [022] In the hydraulic composition of the concepts of the invention presently described and claimed, the accelerator is a material capable of accelerating the hydration of cement and generally classified into organic compounds and inorganic compounds. Suitable inorganic compounds can include, but are not limited to, chlorides such as calcium chloride, sodium chloride and potassium chloride; nitrites, such as sodium nitrite and calcium nitrite; nitrates such as sodium nitrate and calcium nitrate; sulfates such as calcium sulfate, sodium sulfate and alum; thiocyanates such as sodium thiocyanate and calcium thiocyanate; hydroxides such as sodium hydroxide, potassium hydroxide and calcium hydroxide; carbonates such as calcium carbonate, sodium carbonate and lithium carbonate; and alumina analogues such as water glass, aluminum hydroxide and aluminum oxide. Suitable organic compounds can include, but are not limited to, amines such as diethanolamine and triethanolamine; calcium salts of organic acids such as calcium formate and calcium acetate; and maleic anhydride.
    [023] In practicing the presently described and claimed concepts of the invention, a cement retarder may be added. Examples of cement retarders may include, but are not limited to, carboxylic acids and salts thereof, such as gluconic acid, glucuronic acid, citric acid, tartaric acid, glucoheptonic acid, mucic acid, malonic acid, malic acid, and crotonic acid ; inorganic salts thereof with sodium, potassium, calcium, magnesium and ammonium; saccharides and the corresponding salts, such as glucose, sodium gluconate, fructose, galactose, sucrose, xylose, arabinose, ribose, sucrose, mannose; oligosaccharide; dextran; lignosulfonates; phosphonic acids and salts thereof; and boric acid.
    [024] A cement retarder can be a condensed phosphoric acid or a salt thereof. The condensed phosphoric acid or salt thereof comprises two or more phosphoric acid or phosphate units, respectively. Condensed phosphoric acids and salts thereof can be di-, oligo-, and polyphosphoric acids and their salts. In a non-limiting modality, the condensed phosphate is a polyphosphate. Examples of polyphosphates can include, but are not limited to, sodium polyphosphate, calcium polyphosphate, magnesium polyphosphate, ammonium polyphosphate, aluminum polyphosphate, manganese polyphosphate, and combinations thereof.
    [025] The hydraulic composition further comprises cellulose ether. Cellulose ethers are generally used as water-retaining agents to achieve good water retention of the resulting wet mortar. Water retention is necessary to control the water content for adequate hydration of the mortar, including any binder, and to achieve good mortar workability. Secondary beneficial effects resulting from correct mortar hydration performance are less crevice formation and adequate mortar strength development.
    [026] The cellulose ethers in the presently described and claimed concepts of the invention may be selected from the group consisting of alkylcelluloses, hydroxyalkylcelluloses or alkylhydroxyalkylcelluloses, optionally each with two or more different alkyl and/or hydroxyalkyl substituents, or mixtures of two or more of the cellulose derivatives.
    [027] Alternatively, or additionally, the hydraulic composition in accordance with the presently described and claimed concepts of the invention may include one or more water-soluble or at least water-swellable polysaccharides, including, for example, but not by way of limitation, pectin, guar gum, guar derivatives such as guar ethers, gum arabic, xanthan gum, dextran, cold water soluble starch, starch derivatives such as starch ethers, chitin, chitosan, xylan, welan gum, succinoglycan gum, diutan gum, scleroglucan gum, gellan gum, mannan, galactan, glucan, alginate, arabinoxylan, cellulose fibers, and combinations thereof.
    [028] The following is a list of some examples of cellulose ethers that can be used in context with the concepts of the invention presently described and claimed: hydroxyalkylcelluloses, for example, hydroxyethylcellulose (HEC), hydroxypropylcellulose (HPC) and hydroxypropylhydroxyethylcellulose ( HPHEC); carboxyalkylcelluloses, for example carboxymethylcellulose (CMC); carboxyalkylhydroxyalkylcelluloses, for example carboxymethylhydroxyethylcellulose (CMHEC) and carboxymethylhydroxypropylcellulose (CMHPC); sulfoalkylcelluloses, for example sulfoethylcellulose (SEC) and sulfopropylcellulose (SPC); carboxyalkylsulfoalkylcelluloses, for example, carboxymethylsulfoethylcellulose (CMSEC) and carboxymethylsulfopropylcellulose (CMSPC); hydroxyalkylsulfoalkylcelliloses, for example, hydroxyethylsulfoethylcellulose (HESEC), hydroxypropylsulfoethylcellulose (HPSEC) and hydroxyethylhydroxy-roxopropolsulfoethylcellulose (HEHPSEC); alkylhydroxyalkylsulfoalkylcelluloses, for example, methylhydroxyethylsulfoethylcellulose (MHESEC), methylhydroxypropylsulfoethylcellulose (MHPSEC) and methylhydroxyethylhydroxypropylsulfoethylcellulose (MHEHPSEC); alkylcelluloses, for example methylcellulose (MC) and ethylcellulose (EC); binary or ternary alkylhydroxyalkylcellulose, for example, methylhydroxyethylcellulose (MHEC), ethylhydroxyethylcellulose (EHEC), methylhydroxypropylcellulose (MHPC) and ethylhydroxypropylcellulose (EHPC); ethylmethylhydroxyethylcellulose (EMHEC); ethylmethylhydroxypropylcellulose (EMHPC); ionic and non-ionic alkenylcelluloses and mixed alkenylcellulose ethers, for example allylcellulose, allylmethylcellulose, allylethylcellulose and carboxy-methylallylcellulose); dialkylaminoalkylcelluloses, for example N,N-dimethylaminoethylcellulose and N,N-diethylaminoethylcellulose; dialkylaminoalkylhydroxyalkylcelluloses, for example N,N-dimethylaminoethylhydroxyethylcellulose and N,N-dimethylaminoethylhydroxypropylcellulose; aryl- and arylalkyl- and arylhydroxyalkylcelluloses, for example, benzylcellulose, methylbenzylcellulose and benzylhydroxyethylcellulose; as well as the reaction products of the above-mentioned cellulose ethers with hydrophobically modified glycidyl ethers having alkyl residues having C3 to C15 carbon atoms or arylalkyl residues having C7 to C15 carbon atoms.
    [029] According to the concepts of the invention presently described and claimed, the cellulose ether can be MHEC and MHPC, having an aqueous Brookfield solution viscosity of 500 to 130,000 mPa.s, as measured in a Brookfield RVT viscometer at 20°C, 20 rpm and a concentration of 2% by weight using the appropriate spindle.
    [030] According to the concepts of the invention presently described and claimed the hydraulic composition can have additional additives between about 0.005 and about 80% by weight. In a non-limiting embodiment, the amount of additives can be between about 0.5 and about 30% by weight. Additives used may include, but are not limited to, organic or inorganic thickening agents and/or secondary water retention agents, anti-slag agents, air entraining agents, wetting agents, anti-foaming agents, superplasticizers, dispersants , calcium complexing agents, water repellants, redispersible powders, biopolymers, fibers, calcium chelating agents, fruit acids, and surface active agents. Any of the water reducing agents (dispersing or fluidizing agents or super plasticizer) can be used in the hydraulic composition here. Examples of water reducing agents can include, but are not limited to, melamine-based, lignin-based, and polycarboxylate-based compounds. Defoamers used herein may include, but are not limited to, polyester, silicone, alcohol, mineral oil, vegetable oil, and nonionic surfactants.
    [031] Other specific examples of additives may include, but are not limited to, gelatin, polyethylene glycol, casein, lignin sulfonates, naphthalene sulfonate, melamine-formaldehyde condensed sulfonate, sulfonated formaldehyde-sulfonated naphthalene sulfonates, polyacrylates, ether of polycarboxylate, polystyrene sulfonates, phosphates, phosphonates, calcium salts of organic acids having 1 to 4 carbon atoms, such as calcium formate, alkanoate salts, aluminum sulfate, metallic aluminum, bentonite, montmorillonite, sepiolite, fibers of polyamide, polypropylene fibers, polyvinyl alcohol, and homo-, co-, or terpolymers based on vinyl acetate, maleic ester, ethylene, styrene, butadiene, vinyl versatate and acrylic monomers.
    [032] The hydraulic composition according to the concepts of the invention presently described and claimed can be prepared by a wide variety of techniques known to a person skilled in the art. Examples may include, but are not limited to, simple dry blending, combining different components during the spray drying process, spraying solutions or melting onto dry materials, co-extruding, or co-milling.
    [033] The hydraulic composition according to the concepts of the invention presently described and claimed can also be used in the manufacture of a formulation of dry mortar, cement tile glue, cement-based renders, waterproof membranes, and coatings minerals for insulation systems such as ETICS. The hydraulic composition can be mixed with the components of a dry cement mortar composition when making the dry cement mortar.
    [034] According to the concepts of the invention presently described and claimed, the dry cement mortar comprises a component of the hydraulic cement present in the amount of about 10-85% by weight based on the total weight of the dry cement mortar. In a non-limiting modality, the amount of cement component added is about 25 to 80% by weight based on the total weight of the dry cement mortar. In another non-limiting modality, the amount of cement component added is from 30 to 75% by weight. In yet another non-limiting modality, the amount of cement component added is from 35 to 70% by weight.
    [035] Examples of the hydraulic cement component may include, but are not limited to, Portland cement, Portland slag cement, Portland silica fume cement, Portland pozzolan cement, Portland burnt shale cement, limestone cement Portland cement, Portland composite cement, blast furnace kiln cement, pozzolan cement, composite cement, and calcium aluminate cement.
    [036] According to the concepts of the invention presently described and claimed, the dry cement mortar further comprises an aggregate material. Examples of aggregate material can be, but are not limited to, silica sand, dolomite, limestone, light aggregates (eg perlite, expanded polystyrene, hollow glass spheres), rubber fragments (recycled from automobile tires) , and fly ash. For the dry cement mortar of the presently described and claimed concepts of the invention, the aggregates can also have a particle size of up to 5 mm. In a non-limiting modality, the aggregates can have a particle size of up to 2 mm.
    [037] The aggregate can be a fine aggregate. By "fine" it is meant that the aggregate materials have particle sizes of up to about 2.0 mm, or up to about 1.0 mm. In a non-limiting modality, fine aggregates can have a particle size of up to 1 mm. The lower limit of the particle size can be at least 0.0001 mm. In a non-limiting modality, the lower particle size limit can be at least 0.001 mm.
    [038] The amount of aggregate can be around 2090% by weight based on the total weight of the dry cement mortar. In a non-limiting modality, the amount of added aggregate is 25 to 70% by weight based on the total weight of the dry cement mortar. In another non-limiting modality, the amount of added aggregate is from 30 to 65% by weight. In yet another non-limiting embodiment, the amount of aggregate is about 50-70% by weight.
    [039] For a dry cement mortar, the accelerator can be added in amounts of 0.01 to 1.0% by weight based on the total weight of the dry cement mortar. In a non-limiting modality, the amount of accelerator added is 0.05 to 0.5% by weight based on the total weight of the dry cement mortar. In another non-limiting modality, the amount of accelerator added is from 0.1 to 0.3% by weight.
    [040] The amount of cement retarder added can be in a range of 0.001 to 0.5% by weight based on the total weight of the dry cement mortar. In a non-limiting modality, the amount of cement retarder added is from 0.005 to 0.3% by weight based on the total weight of the dry cement mortar. In another non-limiting embodiment, the amount of cement retarder added is from 0.01 to 0.05% by weight.
    [041] The amount of water reducing agent added can range from about 0.01 to about 5% by weight based on the total weight of the dry cement mortar. An optimal quantity can be determined as a function of type and degree. In the case of tile cement mortar compositions, the water reducing agent is used because it is necessary to acquire good fluidity with a minimum amount of water. If the amount of water reducing agent used is too small, it may not be effective for its purpose. If the amount of water-reducing agent used is too large, it can cause the material to separate, such as hemorrhage and aggregated furrowing, leading to a drop in strength or efflorescence.
    [042] The amount of defoamer added is in a range of 0.1 to 5% by weight based on the total weight of the dry cement mortar. In a non-limiting modality, the amount of defoamer added is in a range of 0.2 to 4% by weight based on the total weight of the dry cement mortar.
    [043] In practicing the concepts of the invention presently described and claimed, a polymer emulsion can be used, if necessary, to improve adhesion to the body or wear resistance. The polymer emulsion can take the form of a liquid or redispersible powder. Most of the emulsions that are commercially available as a premix for mixing in place are powder-type (redispersible) polymer emulsion.
    [044] Water-redispersible polymer powders are those that decompose into primary particles in water, and then dispersed ("redispersed") in water. The use of such water-redispersible polymer powders in dry-mix mortars is common and known to improve, depending on the type and addition rate, the adhesion on all types of substrates, the deformability of the mortars, the flexural strength and the strength to abrasion to name just a few of several properties. The polymer powder may comprise one or more compounds selected from homopolymers and/or copolymers and/or terpolymers of one or monomers selected from the group of branched or unbranched C1-C15 alkylcarboxylic acids vinyl esters, ester ( meth)acrylic C1-C15 alcohols, vinylaromatics, olefins, dienes, and vinyl halides.
    [045] In a non-limiting modality, vinyl esters can be vinyl acetate; vinyl propionate; vinyl butyrate; vinyl 2-ethylhexanoate; vinyl laurate; 1-methylvinyl acetate; vinyl pivalate; ethylene-vinyl acetate copolymers having an ethylene content of from about 1 to about 60% by weight; vinyl-ethylene-vinyl chloride copolymers having an ethylene content of about 1 to about 40% by weight and a vinyl chloride content of about 20 to about 90% by weight; vinyl acetate copolymers, with from about 1 to about 50% by weight of one or more copolymerizable vinyl esters, such as vinyl laurate, vinyl pivalate, and alpha-branched monocarboxylic acid vinyl esters having between about from 5 to about 11 carbon atoms, especially vinyl esters of Versatic acid, which may also contain from about 1 to about 40% by weight of ethylene; and vinyl acetate-acrylic ester copolymers with from about 1 to about 60% by weight of acrylic ester, especially n-butyl acrylate or 2-ethylhexyl acrylate, and which may also contain from 1 to 40% by weight of ethylene.
    [046] If desired, the polymers can also contain from about 0.1 to about 10% by weight, based on the total weight of the polymer, of functional comonomers. These functional comonomers can include, but are not limited to, ethylenically unsaturated monocarboxylic or dicarboxylic acids, such as acrylic acid; ethylenically unsaturated carboxyamides such as (meth)acrylamide; ethylenically unsaturated sulfonic acids and/or their salts, such as vinylsulfonic acid; polyethylenically unsaturated comonomers such as divinyl adipate, diallyl maleate, allyl methacrylate and triallyl cyanurate; and/or N-methylol (meth)acrylamides or their ethers, for example their isobutoxy or n-butoxy ethers.
    [047] Methacrylic esters or acrylic esters can be, but are not limited to, methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, n-butyl acrylate, ethyl methacrylate n-butyl, 2-ethylhexyl acrylate, and copolymers of methyl methacrylate with 1,3-butadiene.
    [048] Vinyl aromatics can be, but are not limited to, styrene, methylstyrene, and vinyltoluene, styrene-butadiene copolymers and styrene-acrylic ester copolymers such as styrene-n-butyl acrylate or styrene-2-ethylhexyl acrylate , each having a styrene content from about 10 to about 70% by weight.
    [049] Vinyl halide can be vinyl chloride. Vinyl chloride polymers can be, but are not limited to, vinyl ester/vinyl chloride/ethylene copolymers, vinyl chloride-ethylene copolymers and vinyl chloride-acrylate copolymers.
    [050] In a non-limiting modality, olefins can be ethylene and propylene, and dienes can be 1,3-butadiene and isoprene.
    [051] Polymers can be prepared in a conventional manner. In a non-limiting embodiment, the polymer can be prepared by an emulsion polymerization process. The dispersions used can be stabilized with an emulsifier or subsequently with a protective colloid, an example being polyvinyl alcohol. To prepare water-redispersible polymer powders, the polymer dispersion thus obtained can be dried. Drying can be carried out by spray drying, freeze drying, or by coagulating the dispersion and subsequent fluid bed drying. The water-redispersible polymer powder may comprise one or more compounds selected from protective colloids and antiblocking agents. EP1498446A1 describes production methods and examples, such as water redispersible polymer powders, the entire contents of which are expressly incorporated herein by reference.
    [052] The amount of polymer emulsion added can be in a range of 0.5 to 15%, calculated as solids, based on the total weight of the overall system. In a non-limiting embodiment, the amount of polymer emulsion added can be in the range of 0.5 to 10% by weight, calculated as solids, based on the total weight of the system as a whole. If the amount of polymer emulsion added is less than the range, it may not achieve the desired durability and bond strength. If the amount of polymer emulsion added is more than the range, there may be a risk of air entrainment, which results in disadvantages such as damaged surface appearance and a drop in resistance.
    [053] The hydraulic composition of the presently described and claimed concepts of the invention can be prepared separately or in combination with the components described above to form a dry cement tile glue. Specifically, a cement, aggregate, water reducing agent (fluidizing or dispersing agent), defoamer, cement retarder, accelerator, water-soluble cellulose ether and other optional components, and when a cement mortar composition is intended, by combining cement, aggregate, accelerator, cement retarder, water-soluble cellulose ether and other optional components, mixing them uniformly, adding water thereto, and further mixing.
    [054] As already mentioned above, the dry cement mortar according to the presently described and claimed concepts of the invention comprises a standard dry mortar formulation and the hydraulic composition as specified in detail above. In a non-limiting embodiment, the hydraulic composition can be present in an amount of from about 0.3 to about 70% by weight, based on the total weight of the dry cement mortar. In another non-limiting embodiment, the hydraulic composition can be present from about 0.4 to about 30% by weight, based on the total weight of the dry cement mortar. In yet another non-limiting embodiment, the modified composition can be from about 0.5 to about 15% by weight, based on the total weight of the dry cement mortar.
    [055] The dry cement mortar of the concepts of the invention presently described and claimed may also have, in combination therewith, at least one mineral binder of hydrated lime, gypsum, pozzolan, blast furnace slag, hydraulically active calcium hydrosilicates and hydraulic lime. The at least one mineral binder can be present in the amount of about 0.1-70% by weight.
    [056] The concepts of the invention presently described and claimed also refer to a method of manufacturing a dry cement mortar. The method comprises mixing the hydraulic composition, as specified in detail above, to a standard dry mortar formulation. The compounds of the hydraulic composition can be mixed individually or in combination with the standard dry mortar formulation.
    [057] When preparing a dry cement mortar, according to the concepts of the invention presently described and claimed, the relative amounts of mandatory and optional compounds in the hydraulic composition must be adapted to the total amounts needed in the final dry cement mortar. It is within the knowledge of a person skilled in the art to prepare a hydraulic composition with appropriate amounts of mandatory and optional compounds in light of the amounts of compounds already present in the standard dry mortar formulation. For example, but not by way of limitation, in case the standard dry mortar formulation already comprises additional amounts of cellulose ether than cellulose ethers do not necessarily have to be added to the hydraulic composition, in accordance with the presently described concepts of the invention and claimed. The total amounts of the various compounds in the final dry cement mortar should be in appropriate ranges that can be identified by a person skilled in the art based on his knowledge and routine testing.
    [058] The presently described and claimed concepts of the invention also provide a method to increase the opening time of a dry cement mortar without deteriorating the setting time. The method of increasing the opening time comprises the steps of: a) mixing a hydraulic composition as specified in detail above to a standard dry mortar formulation, wherein the hydraulic composition compounds can be mixed individually or in combination with the formulation of standard dry mortar, b) mixing water to the modified dry mortar formulation, and c) processing the modified dry mortar formulation containing water into any standard form.
    [059] For end use application, dry cement mortar can be mixed with water and applied as a wet material. In accordance with the presently described and claimed concepts of the invention, the composition when used in a dry cement tile glue formulation can be mixed with a sufficient amount of water to produce a cement tile glue mortar. The water/cement ratio (water factor) can affect the strength performance of cement-based mortars. High water demand generally lowers strength values such as tensile strength. However, polyvalent metal salts can make up for the lack of toughness performance at high water levels.
    [060] In the case of a cement mortar, water can be added in an amount of 10 to 80% by weight based on the total weight of the cement mortar. In another non-limiting modality, water can be added in an amount of 17 to 37% by weight. In another non-limiting modality, water can be added in an amount of 20 to 35% by weight.
    [061] The following examples illustrate the concepts of the invention presently described and claimed, parts and percentages being by weight, unless otherwise indicated. Each example is provided by way of explaining the presently described and claimed concepts of the invention, not limiting the presently described and claimed concepts of the invention. Indeed, it will be apparent to those skilled in the art that various modifications and variations can be made to the concepts of the invention presently described and claimed without departing from the scope or spirit of the invention. For example, features illustrated or described as part of one embodiment can be used in another embodiment to provide a still further embodiment. Thus, it is intended that the concepts of the invention presently described and claimed cover such modifications and variations as come within the scope of the appended claims and their equivalents. EXAMPLES
    [062] All examples were conducted on a cement tile glue. The cellulose ether, cement retarder and accelerator used in the examples are described as follows. Analytical data of the MHEC samples used in the
    Retardant: A. Sodium polyphosphate B. Sodium gluconate Accelerator: A. Sodium thiocyanate, technical grade B. Calcium formate C. Calcium chloride Example 1 Visual Open Time Enhancement
    [063] The improvement properties were tested using the following cement tile glue formulation:
    *MHEC = Culminal 4053, available from Ashland Inc. (Wilmington, DE, USA)
    [064] The cement tile glue was prepared, mixed and tested for the opening time in accordance with ISO13007-2. To determine the opening time, the already mixed mortar was applied with a notched spatula (6 x 6 x 6 mm) on a fiber cement board. Every five minutes, 5 x 5 cm of earthenware and tile tiles were incorporated when loading with a weight of 2 kg for 30 seconds.
    [065] The tile was removed and the back of the tile was dismissed. If more than 50% was covered with cement tile glue, opening time was still ok. Opening time has been completed if less than 50% has been covered with cement tile glue.
    [066] The adjustment time was determined by measuring the ultrasonic wave velocity through the sample. The longer the hydration proceeded, the faster an ultrasonic wave was performed through the mortar sample. Depending on the mortar and cement formulation, the ultrasonic wave velocity approached a value of about 2400 m/s. The adjustment time was compared, when half of the hydration was complete, therefore a speed of 1200 m/s was reached. The test results are shown in Table 1. TABLE 1

    * WF: water factor; amount of water used divided by amount of cement tile glue used (CTA), eg 20 g of water in 100 g of CTA at a water factor of 0.2. **SW: tile plates
    [067] As can be seen from Table 1, the addition of retarder alone improves the opening time of 15 minutes (Sample 1) and 30 minutes (Sample 3), but also strongly delays the setting by 450 minutes (Sample 1) and 550 minutes (Sample 3) compared to the reference. When the retarder and accelerator combination is added, the opening time is extended by 25 minutes (Sample 2) and 10 minutes (Samples 4-6) compared to the reference. But the set-up time is comparable to the reference or even faster.
    [068] It is, of course, not possible to describe all possible combinations of components or methodologies for the purpose of describing the described information, but one skilled in the art may recognize that many other combinations and permutations of the described information are possible. Accordingly, the information described is intended to cover all such alternations, modifications and variations which fall within the spirit and scope of the appended claims.
    权利要求:
    Claims (9)
    [0001]
    1. Dry cement mortar with extended opening time characterized by comprising (i) a hydraulic cement component in the amount of 10 to 85% by weight, based on the total weight of the dry cement mortar, and (ii) at least one cement retarder selected from the group consisting of sodium polyphosphate, calcium polyphosphate, magnesium polyphosphate, ammonium polyphosphate, aluminum polyphosphate, manganese polyphosphate and combinations thereof, wherein the cement retarder is in the range of 0.001 to 0 .5% by weight based on the total weight of the dry cement mortar, and (iii) at least one accelerator selected from the group consisting of calcium chloride, potassium chloride, sodium nitrite, calcium nitrite, calcium sulfate, sodium sulfate, alumina, sodium thiocyanate, calcium thiocyanate, sodium hydroxide, potassium hydroxide, calcium carbonate, sodium carbonate, lithium carbonate, sodium silicate ("water glass"), aluminum hydroxide, diethanolamine a, triethanolamine, calcium formate, calcium acetate, maleic anhydride and combinations thereof, wherein the accelerator is in the range of 0.01 to 1% by weight based on the total weight of the dry product cement mortar and (iv) an aggregate material.
    [0002]
    2. Dry cement mortar with extended opening time, according to claim 1, characterized in that the accelerator is sodium thiocyanate.
    [0003]
    3. Dry cement mortar with extended opening time, according to claim 1 or 2, characterized in that it further comprises a cellulose ether.
    [0004]
    4. Dry cement mortar with extended opening time, according to claim 3, characterized in that the cellulose ether is selected from the group consisting of alkylcelluloses, hydroxyalkylcelluloses, alkyl-hydroxyalkylcelluloses and combinations thereof.
    [0005]
    5. Dry cement mortar with extended opening time, according to any one of claims 1 to 4, characterized in that the cement retarder is in the range of 0.005 to 0.3% by weight, based on the total weight of dry cement mortar.
    [0006]
    6. Extended open time dry cement mortar according to claim 5, characterized in that the cement retarder is in the range of 0.01 to 0.05% by weight, based on the total weight of the mortar. dry cement.
    [0007]
    7. Dry cement mortar with extended opening time, according to any one of claims 1 to 4, characterized in that the accelerator is in the range of 0.05 to 0.5% by weight, based on the total weight of dry cement mortar.
    [0008]
    8. Extended open time dry cement mortar according to claim 7, characterized in that the accelerator is in the range of 0.1 to 0.3% by weight, based on the total weight of the dry cement mortar .
    [0009]
    A method for making a cement tile glue characterized by comprising the steps of: v) mixing the dry cement mortar composition with extended opening time as defined in any one of claims 1 to 8 and an optional component; and vi) ) mix the amount of water needed for processing to a configurable mortar.
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    同族专利:
    公开号 | 公开日
    EP2970007B1|2020-01-08|
    WO2014151388A1|2014-09-25|
    ZA201507665B|2017-11-29|
    US9353003B2|2016-05-31|
    CA2905909A1|2014-09-25|
    MX2015012246A|2016-01-12|
    KR20150132187A|2015-11-25|
    JP6276377B2|2018-02-07|
    JP2016511217A|2016-04-14|
    RU2015144101A|2017-04-21|
    US20140311387A1|2014-10-23|
    BR112015022627A2|2017-07-18|
    EP2970007A1|2016-01-20|
    CN105209404A|2015-12-30|
    KR102322517B1|2021-11-05|
    CA2905909C|2017-12-19|
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    法律状态:
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    2020-10-06| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|
    2021-03-09| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|
    2021-06-01| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-08-17| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 13/03/2014, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US201361787219P| true| 2013-03-15|2013-03-15|
    US61/787,219|2013-03-15|
    PCT/US2014/025631|WO2014151388A1|2013-03-15|2014-03-13|Hydraulic composition with prolonged open time|
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