Method for manufacturing green chrome-free steel plate with a fingerprint-resistance

专利摘要:
PURPOSE: A method for manufacturing environmentally friendly Cr-free anti-finger printing strip is provided to manufacture Cr-free anti-finger printing strip having superior workability and corrosion resistance by controlling Si particle size and Si content in anti-finger printing resin solution without separate Cr-free treatment. CONSTITUTION: The method for manufacturing environmentally friendly Cr-free anti-finger printing strip comprises the step of performing phosphate treatment on the zinc plated steel sheet after plating zinc on a steel sheet to be plated with zinc; and coating an anti-finger printing solution on the phosphate treated plated steel sheet by dipping the phosphate treated plated steel sheet into a Cr-free ethylene-acrylic acid resin solution in which size of Si particles is controlled to 5 nm or less, Si content is controlled to the range of 13 to 20%, wherein the phosphate treatment step is performed so that 0.1 to 2.5 g/m¬2 of phosphate is adhered to the surface of the zinc plated steel sheet, and wherein Si particles are formed on the plated steel sheet in a lamella structure in the anti-finger printing solution coating step performed by dipping the phosphate treated plated steel sheet into the Cr-free ethylene-acrylic acid resin solution.
公开号:KR20040016456A
申请号:KR1020020047986
申请日:2002-08-14
公开日:2004-02-25
发明作者:박기덕；노재원；노상걸
申请人:주식회사 포스코；
IPC主号:

专利说明:

METHOD FOR MANUFACTURING GREEN CHROME-FREE STEEL PLATE WITH A FINGERPRINT-RESISTANCE}
[4] The present invention relates to a method for manufacturing an environmentally friendly chromium-free steel plate, and more particularly, to omit chrome treatment of the steel plate used in various home appliances such as computers, acoustic devices, and VTRs. The present invention relates to a method for producing an environmentally friendly chromium-free fingerprint steel sheet which is environmentally friendly and has excellent workability and corrosion resistance.
[5] In general, anti-fingerprint steel plates of electro-zinc plating as materials for various home appliances such as computers, acoustic devices, and VTRs are conventionally subjected to Chromate (Cr) treatment after galvanizing, and coated with anti-fingerprint resins to produce products. Done.
[6] At this time, the Cr film formed by the Chromate treatment is inexpensive and highly corrosion resistant and paintable on the surface of the galvanized steel sheet, and has been applied since ancient times and is essential.
[7] The rust resistance of the Cr film is explained by the barrier effect of the film itself and the self-retainability caused by the chromium ion (Cr + 6) in the film.
[8] In particular, the latter is inherent to the Cr film, so that the soluble components (mainly Cr + 6) in the Cr film exude to the film defects (wounds, etc.) that occur after the film formation, and regenerate the Cr film. It shows excellent corrosion resistance.
[9] However, Cr treatment has been pointed out to have an adverse effect on the human body. This is very useful when Cr + 6 contained in Cr film exists on the surface of metal material, but for human, for example, hepatic insufficiency, blood impurity in contact, allergic dermatitis in contact, skin ulcer, skin erosion, inhalation It is said that there are toxicities such as rhinitis, septal ulcer and asthma, and there is concern about carcinogenicity.
[10] In response to this, development of a surface treatment material containing no Cr at all is required.
[11] Therefore, since the late 90s, the development of manufacturing technology of Cr-Free or door steel sheet has been promoted. However, the Cr-free anti-finger steel sheet developed so far has a disadvantage in that the manufacturing cost is high because the Cr-free coating is usually adhered to 150 mg / ㎡ or more, even though the treatment chemicals are expensive, and the product structure is also directly on the galvanized layer. It has a structure to process the anti-fingerprint coating and to increase the weight of the Cr-Free film, as well as inferior in workability and friction characteristics.
[12] In order to improve this, the conventional technique is to apply phosphate treatment to improve the friction characteristics after electro galvanizing the plated plate material, and Cr-Free treatment by spray and squeezing treatment with the product name PD-2000 and then PMT 50 After drying at ~ 18 ℃, the technology to produce the product by coating the anti-fingerprint resin has been developed.
[13] However, this is because when the Cr-free layer is dried below PMT 90 ℃ during operation, the Cr-Free layer and the anti-finger resin come into contact with the rubbing roll coater, so that a reaction occurs in the form of fine tangles on the surface of the roll coater. There is a problem that the roll coating operation becomes difficult because SiO2 type film is formed by reaction with Si component in the anti-fingerprint solution on the roll surface.
[14] When Cr-free treatment by spray and squeezing, there is a problem that surface quality such as roll mark is deteriorated due to change of strip width on squeezing roll surface and adhesion of Cr-free resin solution on roll surface.
[15] In order to solve the above problems, the present invention in the manufacture of environmentally friendly Cr-Free to fingerprint steel sheet by treating the conventional Cr-Free coating by Spray + Squeezing and the process of treating the separate fingerprint resin simply Cr- It is an object of the present invention to provide a method for producing an environmentally friendly chromium-free or steel plate, which improves work stability and prevents various surface defects by unifying by a free type or fingerprint resin coating process.
[1] 1 is a schematic view illustrating a process in which Si particles are formed in a layer in a fingerprinting step constituting a method for manufacturing an environmentally friendly chromium-free to steel sheet according to the present invention.
[2] ♣ Explanation of symbols for main part of drawing ♣
[3] 1: Spherical Si Particle 2: Plate Si Particle 3: Layered Si Particle
[16] In order to achieve the above object, the present invention comprises the steps of performing phosphate treatment after galvanizing the galvanized plate; The phosphate plated plated material is controlled by Si coating in a chromium-free ethylene-acrylic resin solution controlled to a Si particle size of 5 nm or less and controlled to a Si content of 13 to 20%. It provides a method for producing an environmentally friendly Cr-Free anti-fingerprint steel sheet.
[17] In addition, the present invention provides a method for producing an environmentally friendly Cr-Free anti-fingerprint steel sheet, characterized in that the phosphate adhesion amount in the step of phosphate treating the galvanized sheet material to be 0.1 ~ 2.5g / ㎡,
[18] In the step of immersing the phosphate plated plate in a chromium-free ethylene-acrylic resin solution, the Si particles formed on the plate plate is a layered structure of the environmentally friendly Cr-Free anti-fingerprint steel sheet It provides a manufacturing method.
[19] That is, according to the present invention, as shown in Table 1, the plating process → phosphate treatment → Cr-free manufacturing process of the steel plate produced by the conventional plating treatment → phosphate treatment → Cr-free treatment → fingerprint treatment is performed. It is to provide a method for producing a fingerprint steel sheet improved by the same process as the fingerprint treatment.
[20]
[21] EMBODIMENT OF THE INVENTION Hereinafter, the structure of this invention is demonstrated in detail.
[22] 1 is a schematic view illustrating a process in which Si particles are formed in a layer in a fingerprinting step constituting a method for manufacturing an environmentally friendly chromium-free to steel sheet according to the present invention.
[23] As described above, the present invention is treated with an electrogalvanized steel sheet so that the phosphate is attached to the phosphate treatment solution in the range of 0.1 ~ 2.5g / ㎡ and then Cr-Free treatment for securing corrosion resistance of the conventional anti-fingerprint resin itself In order to improve the corrosion resistance of conventional anti-fingerprint resins without increasing the treatment by Cr, as shown in Table 2 or FIG. 1, the Si size added in the anti-fingerprint resin solution is reduced, and the Si particle form is reduced. By layering (3) the spherical or plate-like (1, 2) shape, the resin layer permeability of the corrosion factor in the anti-fingerprint resin layer itself is reduced compared to the prior art, thereby preventing corrosion by penetrating the corrosion factor.
[24]
[25] The conventional anti-fingerprint resin solution contains about 19% or more of Si particles having a particle size of 20 nm or more and a spherical or plate-like form in an ethylene-acrylic acid resin. However,
[26] In the present invention, the same ethylene-acrylic acid resin (Ethylene-Acrylic Acid Resin) in the particle size of 5nm or less, while forming a layered structure of the anti-fingerprint resin solution controlled so that the content is about 13 to 20% Was used.
[27] Hereinafter, the embodiment of the present invention will be described in detail.
[28] EXAMPLE
[29] The zinc plated steel sheet having a zinc adhesion of 20 g / m 2 was subjected to phosphate treatment, Cr-free treatment, and anti-fingerprint treatment as follows.
[30] Phosphate treatment of anti-finger steel sheet and conventional comparative material according to the present invention is maintained by maintaining the phosphate solution prepared with the chemical name PB-3312JR at 4 ~ 25pt acidity (TA), 0.2 ~ 6.0pt free acidity (FA), temperature 48 ℃ Phosphate treatment was performed by holding the plated steel plate for 6 seconds.
[31] In order to prepare a conventional comparative material compared with the present invention, A-type Cr-Free treatment solution was prepared using 3-10% solids, 0.5-5.0% phenolic Resign, 0.5% Ti fluoride, 5% amino alcohol, and silane coupler. Consisting of 5% rinse, the Spray + Squeezing process was carried out under a pressure condition of 2Bar, and then dried at a temperature of 50 ~ 120 ℃.
[32] In addition, the conventional B-type Cr-Free treatment solution is composed of 3 to 10% solids, 0.5 to 5.0% polypropylene resin, 0.6% Ti fluoride, 5% amino alcohol, 5% silane coupling agent, and spray + squeezing. The process was carried out under a pressure condition of 2Bar, and then dried at a temperature of 50 ~ 120 ℃.
[33] The Cr-free plated steel sheet under the above solution conditions was coated on the anti-fingerprint solution consisting of the chemical name K-100 (3A, 3B) using a anti-fingerprinter so that the resin adhesion amount was 800-1200 mg / m2. And dried at a temperature of 180 ° C.
[34] The anti-finger steel sheet according to the present invention is treated by immersing the galvanized steel sheet in the phosphate treatment solution as described above, and then immersing the phosphate-treated steel sheet in Cr-Free anti-fingerprint resin solution composed of CF-200. The resin coating amount was coated to 800 ~ 1200mg / ㎡, and then dried at a temperature of 180 ℃.
[35] As described above, the properties of the anti-fingerprint steel sheets manufactured according to the conventional examples, the comparative examples, and the present invention examples were evaluated, and the evaluation criteria were Si content, work stability, and corrosion resistance.
[36] The work stability was measured by the formation of reactants (solution contamination), the presence of streaks and the time of occurrence during the roll coating (Roll Coating),
[37] The corrosion resistance was evaluated by measuring the initial white rust occurrence time using SST.
[38] As shown in Table 3, applying phenolic or polypropylene resin (Resin) in Cr-free chemicals in the prior art and coating the anti-fingerprint resin after drying, solution entanglement or working time 1 to 2 on the anti-fingerprint Roll surface It can be seen that there is a problem that streaks are generated due to Cr-free treatment roll contamination after a lapse of time. (See Examples 1 to 4.)
[39] In order to solve the problems in the operation of manufacturing such conventional Cr-Free or steel plate, omit a separate Cr-Free treatment process to simplify the process, and to ensure corrosion resistance in the resin layer itself when coating the fingerprint resin. Inventive has been developed, and Examples 5 to 15 in Table 3 improve the Si particle size and content in conventional anti-fingerprint resin solutions to allow penetration of the resin layer against corrosion factors when the anti-fingerprint steel sheet is exposed to a corrosive environment. It is possible to expect the advantage of simplifying the process while at the same time solving the problem of workability which is a conventional problem by securing the target corrosion resistance by suppressing.
[40] In more detail, Examples 5 to 10 in Table 3 are measured and displayed as a comparative example for the present invention, the Si particle size in the fingerprint resin solution exceeds 5nm or Si content is 13-20% If it is out of the corrosion resistance to the steel plate is deteriorated it can be confirmed that it is difficult to secure the target corrosion resistance.
[41] However, it can be seen that when the Si particle size in the resin solution, which is the reason for the numerical limitation of the present invention, is 5 nm or less and the Si content is 13 to 20%, the corrosion resistance is excellent in 96 hours or more.
[42]
[43] As described above, the present invention is excellent in workability and corrosion resistance by controlling the Si particle size and Si content in the conventional anti-fingerprint resin solution without a separate Cr-Free treatment in manufacturing an environmentally friendly Cr-Free anti-fingerprint steel sheet There is an effect of providing a technology capable of producing this excellent chromium-free (Cr-Free) to door steel sheet.

权利要求:
Claims (3)
[1" claim-type="Currently amended] In the method for producing a Cr-free anti-fingerprint steel sheet,
Performing galvanization on the galvanized sheet and then performing a phosphate treatment;
The phosphate plated plated material is controlled by Si coating in a chromium-free ethylene-acrylic resin solution controlled to a Si particle size of 5 nm or less and controlled to a Si content of 13 to 20%. Method for producing environmentally friendly Cr-Free anti-fingerprint steel sheet.
[2" claim-type="Currently amended] The method of claim 1,
The phosphate treatment of the galvanized sheet material is a method for producing an environmentally friendly Cr-Free anti-fingerprint steel sheet, characterized in that the phosphate adhesion amount is treated to be 0.1 ~ 2.5g / ㎡.
[3" claim-type="Currently amended] The method of claim 1,
The phosphate-treated plated plate material is immersed in a chromium-free ethylene-acrylic resin solution and subjected to a fingerprint treatment, wherein the Si particles formed on the plated plate material have a layered structure. Manufacturing method.

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同族专利:

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公开号 | 公开日

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KR100491122B1|2005-05-25|

引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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法律状态:
2002-08-14|Application filed by 주식회사 포스코

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2002-08-14|Priority to KR10-2002-0047986A

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2004-02-25|Publication of KR20040016456A

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2005-05-25|Application granted

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2005-05-25|Publication of KR100491122B1

优先权:

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申请号 | 申请日 | 专利标题

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KR10-2002-0047986A|KR100491122B1|2002-08-14|2002-08-14|Method for manufacturing green chrome-free steel plate with a fingerprint-resistance|