Liquid friction-increasing rubber for shoe plate of rear-drum brake and preparation method thereof
A drum brake and shoe technology, applied in the direction of coating, conjugated diene coating, etc., can solve the problem that the initial fitting rate of the shoe and the brake drum is not high, and cannot effectively offset the machining accuracy, thickness and uniformity. It is difficult to control and other problems to achieve the effect of easier and even distribution, reduced braking noise, and braking relief
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preparation example Construction
[0014] The preparation method of the rear drum brake shoe liquid friction-increasing rubber, the method comprises the following steps:
[0015] (1), 1-4% of silicon carbide, 1-2% of antimony sulfide, 2-4% of benzoyl peroxide, 0.2-1% of sulfur, 1-3% of quartz powder, 5-12% of nitrile rubber, Dissolve in ethyl acetate and stir well;
[0016] (2), apply the above mixture to the surface of the processed hoof by brushing or soaking hair;
[0017] (3), let stand to dry;
[0018] (4) Place the hoof in a vulcanization box with a constant temperature of 135-155°C for 15-20 minutes to fully vulcanize the rubber;
[0019] (5) The vulcanized shoe can be directly used for brake assembly assembly after cooling.
Embodiment 1
[0020] Embodiment 1: Prepared from the following raw materials by weight ratio, friction agent (silicon carbide) 1%, flame retardant (antimony sulfide) 1%, vulcanizing agent (benzoyl peroxide) 2%, vulcanization aid (sulfur) 0.2%, reinforcing agent (quartz powder) 1%, nitrile rubber 5%, solvent ethyl acetate and the rest.
Embodiment 2
[0021] Embodiment 2: be prepared by weight ratio by following raw material, friction agent (silicon carbide) 4%, flame retardant (antimony sulfide 2%, vulcanizing agent (benzoyl peroxide) 4%, vulcanization aid ( Sulfur) 1%, reinforcing agent (quartz powder) 3%, nitrile rubber 12%, solvent ethyl acetate and the rest.
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