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Rear drum brake shoe liquid friction-increasing rubber and preparation method

A drum brake and shoe technology, applied in the coating and other directions, can solve the problems such as the low initial fit rate of the shoe and the brake drum, the inability to effectively offset the processing accuracy, and the difficulty in controlling the thickness and uniformity. Evenly distributed, reduced braking noise, braking relief effect

Active Publication Date: 2017-01-04
ZHEJIANG WANXIANG SYST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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Examples

Experimental program
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Effect test

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), silicon carbide 1~4%, antimony sulfide 1~2%, benzoyl peroxide 2~4%, sulfur 0.2~1%, quartz powder 1~3%, nitrile rubber 5~12%, 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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PUM

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Abstract

The invention relates to a liquid friction-increasing rubber for a rear drum brake shoe and a preparation method thereof, comprising: 1. dissolving silicon carbide, antimony sulfide, benzoyl peroxide, sulfur, quartz powder, and nitrile rubber in ethyl acetate , and stir well; 2. Apply the above mixture to the surface of the processed hoof by brushing or soaking hair; 3. Let it stand to dry; 4. Put the hoof in a constant temperature vulcanization box to fully vulcanize the rubber ; 5. The vulcanized shoe can be directly used for brake assembly assembly after cooling. The beneficial effects of the present invention are: the invention adjusts the friction-increasing formula into a liquid state, which is convenient for painting, can form productivity, and is suitable for mass production; the surface coating is uniform, which can effectively offset the influence of processing accuracy and improve the lamination rate; Rubber (Nitronitrile Rubber) is used as the base material to increase elasticity and cushioning performance, effectively reducing noise; using quartz powder instead of corundum, the friction-increasing material is easier to distribute evenly, eliminating hard spots and improving the driver's comfort.

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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Patent Type & Authority Patents(China)
IPC IPC(8): C09D109/02C09D7/12
Inventor 徐祖锋陈菊
Owner ZHEJIANG WANXIANG SYST
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