Liquid friction-increasing rubber for shoe plate of rear-drum brake and preparation method thereof
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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
Active Publication Date: 2015-02-04
ZHEJIANG WANXIANG SYST +1
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Problems solved by technology
The disadvantages are: the thickness and uniformity of the paste-like friction-increasing agent are not easy to control on the surface of the shoe, and the brushing efficiency is low; after the application of the friction-increasing agent, the lack of processing accuracy cannot be effectively offset, and the initial bonding rate between the shoe and the brake drum Not high; the composition determines that the friction agent has no elastic buffer, and it is easy to produce braking noise during braking; hard spots and lumps are easy to appear on the surface, rough braking, and accelerated brake drum wear and tear
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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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Abstract
The invention relates to liquid friction-increasing rubber for a shoe plate of a rear-drum brake and a preparation method thereof. The preparation method comprises the following steps: 1, dissolving silicon carbide, antimony sulfide, benzoyl peroxide, sulphur, quartz powder and Buna-N rubber in ethyl acetate and fully stirring; 2, smearing the above mixture onto the surface of a processed shoe plate by a brushing method or an infiltration method; 3, standing and air-drying; 4, placing the shoe plate in a constant-temperature vulcanization box to fully vulcanize rubber; and 5, cooling the vulcanized shoe plate and directly applying the shoe plate in assembling of the brake. The invention has the following beneficial effects: as the friction-increasing formula is blended into a liquid state, the liquid friction-increasing rubber is convenient to smear, can produce productivity and is suitable for mass production; the surface coating is uniform so as to effectively cancel influence of processing precision and raise conjoint ratio; as NRB (Buna-N rubber) is used as a base material, elasticity and buffer performance are enhanced and noise is reduced effectively; and as quartz powder is used to replace emery, the friction-increasing material is easier to distribute uniformly, hard lumps and hard spots are eliminated, and comfortability of drivers is improved.
Description
technical field [0001] The invention belongs to the field of rear drum brake shoes, in particular to a liquid friction-increasing rubber for rear drum brake shoes and a preparation method thereof. Background technique [0002] The initial braking force of the rear drum brake is insufficient. At present, the method of applying a layer of friction-increasing agent on the surface of the brake shoe is mostly used. The formula of the friction-increasing agent mainly includes emery, chromium oxide, antimony sulfide, surface rubber, and ethyl acetate. According to the ratio of 1:3:1:2:3, it is prepared into a paste, and then brushed on the surface of the hoof with paint, and then assembled directly after natural air drying. Its disadvantages are: the thickness and uniformity of the paste-like friction-increasing agent are not easy to control on the surface of the shoe, and the brushing efficiency is low; after the application of the friction-increasing agent, the lack of processing...
Claims
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Application Information
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