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[0007] However, in these coating agents for rubbery elastic bodies, the polybutadiene derivative resin, which is one of the components of the coating agent, sticks at high temperature, and there is a phenomenon that the abrasion resistance and wear characteristics are lowered. Layer resistance at high temperatures can be problematic
Method used
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Embodiment 1
[0052] Methylcellulose (Shin-Etsu Chemical) 10% toluene solution 130 (13) parts by weight
[0053] 1,2-polybutadiene containing isocyanate group 65 (32.5) parts by weight
[0054] (Nippon Soda product TP1001; 50% butyl acetate solution)
[0059] Graphite (Nichiden Carbon Co., Ltd. product C-1) 7.8 (7.8) parts by weight
[0060] Toluene 653 parts by weight
[0061] Mix the components of the above coating agent (the solution concentration is weight %, the value in brackets is the weight part of solid content) and mix them on the compression-molded sheet (60×25×2mm), O-ring (inner diameter: 119.6mm, thick 7 mm in diameter, identification number P120) and oil seals (85 mm in in...
Embodiment 2
[0086] In embodiment 1, use 1,2-polybutadiene (Nippon Soda product G-1000) 19.5 (19.5; Hydroxyl value 70 (KOHmg / g)) weight part and isocyanate (Bayer company's product Desmodur R) 13 (13) parts by weight (7% isocyanate content) of the reaction product to replace 1,2-polybutadiene containing isocyanate groups, and the amount of toluene was changed to 685 parts by weight.
Embodiment 3
[0088] In Example 1, the amount of graphite was changed to 21.7 (21.7) parts by weight, and the amount of toluene was changed to 825 parts by weight.
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Abstract
Disclosed is a coating agent comprising a cellulose derivative, a 1,2-polybutadiene having an isocyanate group, a synthetic wax having a softening point of 100 to 150 DEG C, an aliphatic amide having a softening point of 60 to 170 DEG C and graphite. The coating agent has satisfactory levels of properties required for a coating agent for a rubbery elastic material, such as a sticking-preventing property, an adhesion-preventing property, a blocking-preventing property, and improved abrasion resistance. The coating agent can be used as a surface treatment agent for a vulcanized rubber, which does not cause adhesion upon compression at a high temperature or detachment of a coating film by friction / abrasion under a high surface pressure.
Description
technical field [0001] The present invention relates to a coating agent, and more specifically, to a coating agent for elastomers used as sealing materials and the like. Background technique [0002] In the past, for the purpose of anti-adhesion, anti-blocking, and improvement of wear resistance, a graphite coating film or a graphite coating was formed on the surface of rubber-coated metal gaskets or bearing gaskets, oil gaskets, O-rings, and other rubber elastic bodies. Metal salts or amides of fatty acids, waxes such as paraffin, silicone oil, etc., or coatings containing ethyl cellulose, phenolic resins, silicone resins, etc. as binders, but even if these coatings are formed, the engine mat Gaskets, etc., under the conditions of high surface pressure and high temperature and the vibration of the engine, the rubber coating on the surface of the gasket will also wear and gas leakage will occur. In addition, the rubber coating layer of a rubber elastic body sliding part suc...
Claims
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