• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a watch component (1) made of a composite material comprising an organic matrix reinforced with graphene, said organic matrix being made of a polymer having a Young's modulus E t greater than or equal to 2 and, preferably at 3 GPa.
    公开号:CH713639A1
    申请号:CH00394/18
    申请日:2018-03-26
    公开日:2018-09-28
    发明作者:Corvasce Liliane；Corvasce Filomeno；Eggenschwiler Romain；Maître Jean-Marc
    申请人:Maitre Freres Sa；
    IPC主号:
    专利说明:

    Description
    TECHNICAL FIELD The present invention relates to the watchmaking field and, more specifically, to a watchmaking component made of a synthetic material reinforced with graphene.
    PRIOR ART [0002] In watchmaking, metal alloys are widely used for their remarkable mechanical properties (hardness, ductility, rigidity, absence of brittleness, etc.). We can cite the use of austenitic stainless steels, brass or titanium alloys for watch cases, dials, hands, etc. However, they have the disadvantage of being relatively heavy with densities greater than 4 for titanium alloys and greater than 8 for brasses or stainless steels. They are also expensive and require a machining step for final shaping. Synthetic materials with their low density and their direct shaping in injection molds allow these disadvantages to be overcome. However, they have the disadvantage of being less efficient in terms of mechanical properties than metal alloys.
    To date, there is still a demand in watchmaking for materials combining the advantages of metal alloys and synthetic materials. More specifically, there is a demand for materials combining lightness, mechanical strength, ductility, as well as other properties such as corrosion resistance and wear resistance.
    SUMMARY OF THE INVENTION The object of the present invention is therefore to propose a composite material having a compromise between the mechanical properties of metal alloys and those of synthetic materials, for use in horological components.
    To this end, the present invention provides a timepiece component made of a synthetic material reinforced with graphene. This synthetic material comprises a matrix made of a so-called high or ultra high performance polymer such as PEEK.
    The timepiece component made of this material has the advantage of being light thanks to the low density of the material with values of the order of 1.3 while having superior mechanical properties thanks to the reinforcement of the matrix by graphene.
    Other features and advantages of the present invention will appear in the following description of a preferred embodiment, presented by way of non-limiting example with reference to the accompanying drawings.
    BRIEF DESCRIPTION OF THE FIGURES [0008]
    Figs. 1 and 2 respectively represent a watch case and a casing circle made with the composite material according to the invention.
    DESCRIPTION OF THE INVENTION The present invention relates to a timepiece component made of a synthetic material reinforced with graphene. The timepiece component can be a covering component such as a watch case, a middle part, a caseback, a bezel, a pusher, a bracelet link, a bracelet, a dial, a casing circle, etc. or a movement component such as a bridge or a plate, etc. By way of illustration, FIGS. 1 and 2 represent a watch case 1 and a casing circle 2 designed with the composite material according to the invention.
    The composite material comprises an organic matrix produced with a so-called high or ultra high performance polymer. These are polymers that withstand extreme environments. Their performance is based on high chemical, thermal, pressure, fatigue and abrasion resistance. These materials are also known for their high strength properties and their high modulus.
    High or ultra high performance polymers generally have breaking load properties greater than or equal to 70 or even 80 MPa with an elongation at break greater than or equal to 3% and a Young's modulus greater than or equal to 3 GPa. Certain high performance polymers such as PVDF may nevertheless have weaker properties with a Young's modulus greater than or equal to 2 GPa, a breaking load greater than or equal to 30 MPa with, as a corollary, a greater elongation at break. or equal to 20% which can go up to values of 300%.
    [0012] The selected polymers according to the invention are distinguished more precisely by their Young's modulus E t greater than or equal to 2 and preferably 3 GPa according to ISO 527-1: 2012. Preferably, the polymer to ultra tall
    CH 713 639 A1 performances are PAEK (Polyaryletherketone), PEEK (Polyetheretherketone), PEKK (Polyetherketoneketone), PFSA (Perfluorosulfonic acid), PI (Polyimide), SRP ('Self-reinforced' polyphenylene), PAI (Polyamide-imides), HTS (High temperature sulfone) and the high performance polymers are PPS (Phenylene sulfide), PSU (Polysulfone), PPSU (Polyphenylsulfone), PPA (Polyphthalamide), PFA (Perfluoroalkoxy), MFA (Perfluoromethylalkoxy), PVDF (Polyfluoride vinylidene). More preferably, the polymer chosen is PEEK.
    According to the invention, graphene and, more specifically, a graphene powder is combined with one of these polymers of high to ultra high performance type to obtain a polymer / graphene composite with stiffness properties and ultimate properties (elastic limit , breaking load, elongation, etc.) high. The content by weight of graphene in the composite is between 0.1 and 15%, preferably between 0.5 and 10%, more preferably between 1 and 5% (limits included). The addition of graphene to the polymer makes it possible to develop an infinity of rigid candidates, which can be injected by the transformation methods well known to the skilled person. According to the invention, graphene from different manufacturing processes (chemical vapor deposition, mechanical and chemical exfoliation, etc.) can be used. As an example, the graphene according to the invention can be a graphene FLG (Few-Layer Graphene) which has an average thickness of 4 to 6 nm and is composed of 3 to 5 layers of carbon.
    The composite material reinforced with graphene has, among other things, improved flexural and tensile properties with, according to ISO 527-1: 2012, a stress at the flow threshold σγ as well as a stress at Out o b greater than or equal to 80 MPa and preferably 90 MPa, deformation within an upper flow there or equal to 3%, preferably 4%, and a Young's modulus e greater than or equal t at 3.5 and preferably at 4 GPa. Furthermore, the flexural modulus E f according to ISO standard 178: 2.010 is greater than or equal to 3.5 and preferably to 4 GPa. The reinforced material has a density between 1 and 3 g / cm 3 determined according to standard ISO 1183-1: 2012.
    The final performance of the mixture does not only depend on the proportion of graphene in the polymer but also on the method of incorporating graphene into the polymer matrix. Using a twin screw extruder, it is possible to disperse graphene in the matrix to obtain unusual performance properties in terms of stiffness, thermal conductivity, electrical conductivity, ultimate strength, anisotropy, phase ratio crystalline / amorphous. These properties can be adjusted according to the specifications of the final part.
    The results from PEEK / graphene mixtures according to the invention are listed below.
    Examples The formulas were developed from PEEK and graphene Nanoxplore heXo-G V4. Three formulas have been tested. A first reference does not include graphene and is referenced PEEK in table 2 below. In a second formula according to the invention, the material comprises 2% by weight of graphene. In a third formula according to the invention, the material comprises 5% by weight of graphene. Table 1 shows the characteristics of graphene Nanoxplore heXo-G V4. It is a graphene FLG (Few-Loyer Graphene) produced by a ball mill technology.
    [0018]
    Average thickness (nm) 4-6 Average size of the flake (μm) n û Volume density (g / cm 3 ) 0.13 BET area (m 2 / g) 100-150 Appearance powder Carbon (% wt) > 93 Oxygen (% wt) <4 Ash (% wt) 2.7
    Table 1 The mixtures were produced in an extruder of the “twin screw extruder” type and injected at a temperature of 390 ° C.
    The mechanical properties of the samples were measured as well as their densities. Table 2 shows the results of density measurements, tensile tests and bending tests. The tensile tests were carried out in accordance with ISO 527-1: 2012. In accordance with this standard, the stress at the flow threshold σγ, also called the apparent elastic limit, the breaking stress o b , the deformation within the flow e y and the Young's modulus E t
    CH 713 639 A1 were measured. The density measurements p were carried out according to standard ISO 1183-1: 2012. Furthermore, the flexural modulus E f was measured according to standard ISO 178: 2010. Each test was repeated twice for each grade, the table 2 shows the average.
    Samples p (g / cm 3 ) And (MPa) o y (MPa) o b (MPa) e y (%) Ef (MPa) Ref PEEK 1.29 3900 97.6 81.9 5.1 3780 + 2% graphene 1.32 4500 97.3 96.6 5 4465 + 5% graphene 1.31 4510 96 94.8 4.2 4510
    Table 2 It is observed that the materials with graphene have a tensile stress o b increased by almost 20% while retaining a similar elastic strain e y of the order of 5%. Similarly, a significant increase in the Young's modulus E t and the flexural modulus E f is observed with increases of 15% and almost 20% respectively. Few differences are observed between the samples reinforced with 2 or 5% of graphene, 2% of graphene in the case of a PEEK matrix already making it possible to obtain improved performances.
    权利要求:
    Claims (9)
    [1]
    Claims
    1. Watch component produced in a composite material comprising an organic matrix reinforced with graphene, said organic matrix being produced in a polymer having a Young E t modulus greater than or equal to 2 and, preferably, 3 GPa.
    [2]
    2. Watch component according to claim 1, characterized in that the percentage by weight of graphene in the composite material is between 0.1 and 15%, preferably between 0.5 and 10% and more preferably between 1 and 5%.
    [3]
    3. Watch component according to claim 1 or 2, characterized in that the organic matrix is produced in a polymer chosen from the list comprising PAEK, PEEK, PEKK, PFSA, Pi, SRP, PAI, HTS, PPS, PSU, PPSU , PPA, PFA, M FA and PVDF.
    [4]
    4. Watch component according to claim 3, characterized in that the polymer is PEEK.
    [5]
    5. timepiece component according to any one of the preceding claims, characterized in that the composite material has a stress at the flow threshold oyet a stress at break o b respectively greater than or equal to 80 and, preferably, 90 MPa .
    [6]
    6. timepiece component according to any one of the preceding claims, characterized in that the composite material has a deformation at the flow threshold εγ greater than or equal to 3% and, preferably, greater than or equal to 4%.
    [7]
    7. timepiece component according to any one of the preceding claims, characterized in that the composite material has a Young's modulus E t greater than or equal to 3.5 and, preferably, to 4 GPa.
    [8]
    8. Watch component according to any one of the preceding claims, characterized in that it is chosen from the list comprising a watch case, a casing circle, a middle part, a case back, a bezel, a push button, a link bracelet, a bracelet, a dial, a bridge and a plate.
    [9]
    9. Watch comprising the timepiece component according to any one of the preceding claims.
    CH 713 639 A1
    类似技术:
    公开号 | 公开日 | 专利标题
    EP2413984B1|2017-08-23|Fasteners made of a polymer material
    FR2900417A1|2007-11-02|Amorphous carbon based hard multilayer film for hard surface component such as sliding component of machine, has base layer containing nitride, compositional gradient layer and surface layer, sequentially formed on substrate
    US8409722B2|2013-04-02|Alloy material having high-temperature corrosion resistance, thermal barrier coating, turbine member, and gas turbine
    Zhang et al.2009|Possible pitfalls in theoretical determination of ground-state crystal structures: The case of platinum nitride
    CH713639A1|2018-09-28|Clock component made of composite material comprising an organic matrix reinforced with graphene.
    WO2017102661A1|2017-06-22|Method for producing a timepiece component
    Chaturvedi et al.2013|Spectroscopic and morphological analysis of graphene vinylester nanocomposites
    WO2008102768A1|2008-08-28|Carrier film for use in fuel cell production process, and method for production thereof
    Liu et al.2014|Enhancement on interlaminar shear strength and water‐lubricated tribological performance of high‐strength glass fabric/phenolic laminate by the incorporation of carbon nanotubes
    Gang et al.2015|The research on the effect of SiO2 and CF on the tensile and tribological properties of PI composite
    JP5055535B2|2012-10-24|Method for producing carbon-based bilayer film with excellent underwater peel resistance
    CA2572807C|2014-08-12|Anti-corrosive insulating clip composed entirely of a polymer composition
    CN101117439A|2008-02-06|Composite material and musical movements baseboard
    EP3037463B1|2018-12-05|Composite material, in particular for horology
    Abdollah2017|Agricultural-waste based polymeric composite as a new self-lubricating antifriction material
    Pagès et al.2006|Raman study of the random ZnTe–BeTe mixed crystal: Percolation model plus multimode decomposition
    CN105968558A|2016-09-28|Heat-conductive anti-static hard Teflon engineering plastic
    JP6382679B2|2018-08-29|Manufacturing method of sliding member
    Xu et al.2007|Mechanical properties of Al x Ga 1− x N films with high Al composition grown on AlN/sapphire templates
    Liu et al.2021|Negative Thermal Expansion HfV₂O₇ Nanostructures for Alleviation of Thermal Stress in Nanocomposite Coatings
    Achour et al.2008|Résistance à la traction et module d’élasticité des bétons calcaires: application à des mélanges tunisiens
    Kong et al.2020|A study on the tribological property of MoS₂/Ti–MoS₂/Si multilayer nanocomposite coating deposited by magnetron sputtering
    Michau et al.2018|Vers des combustibles encore plus robustes en cas d’accident
    Sardar et al.2014|Evaluation of wear behavior of a nonmetallic spur gear
    Jojibabu et al.2017|Effect of nanoclay addition on the lap shear strength of epoxy adhesive bonded joints
    同族专利:
    公开号 | 公开日
    CH713639B1|2021-09-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CH3982017|2017-03-27|
    [返回顶部]