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Zero-asbestos acrylate rubber-based synthetic brake shoe and its preparation method and use

An acrylic and synthetic brake shoe technology, which is applied in mechanical equipment, friction linings, gear transmission mechanisms, etc., can solve the problems of sepiolite easy to absorb moisture, cracks in products, and air bubbles in semi-finished products, so as to improve the comprehensive mechanical properties , Improving the brittleness of the friction body and the effect of good friction and heat resistance

Active Publication Date: 2022-05-24
铁科金化检测中心有限公司 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Before 2003, asbestos was mostly used as fiber reinforcement in traditional synthetic friction materials for railways in my country. However, as people found that asbestos has carcinogenic effects, developed countries such as Europe and the United States are gradually reducing or even banning the use of asbestos.
[0004] (1) Sepiolite is easy to absorb moisture. After the raw material absorbs moisture during storage and mixing, it is molded under high temperature and high pressure to volatilize the moisture. If the exhaust is not timely, it is easy to cause air bubbles inside the molded semi-finished product , and form internal cracks in the product after heat treatment, affecting the service strength of the product;
[0005] (2) The sepiolite in the raw material will also increase the water absorption rate of the product, causing the synthetic brake shoe to form a water film when braking in wet weather, aggravating the adhesion of the metal particles generated by the friction on the surface of the brake shoe, resulting in metal mosaic phenomenon;
Therefore, the formulation of nitrile rubber, styrene-butadiene rubber, and butadiene rubber is prone to scorching during processing, and the storage period of the mixed rubber is generally not more than 3 days in summer, and longer time Storage will cause the fluidity of the rubber to deteriorate sharply, making it difficult for the material to fill the mold when molding the brake shoe, and the product is prone to cracks, lack of material and other appearance defects

Method used

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  • Zero-asbestos acrylate rubber-based synthetic brake shoe and its preparation method and use
  • Zero-asbestos acrylate rubber-based synthetic brake shoe and its preparation method and use
  • Zero-asbestos acrylate rubber-based synthetic brake shoe and its preparation method and use

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Experimental program
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Effect test

Embodiment 1-10

[0049] Prepare the synthetic brake shoe according to each raw material shown in Table 1 and its corresponding amount, and the preparation method adopted is as follows:

[0050] (a) take by weighing the raw material of the formula amount shown in table 1, place on the twin-roll rubber mixer, carry out plasticizing and mixing successively;

[0051] (b) placing the kneaded material obtained in step (a) on a high-speed mixer, mixing at a speed of 800 rev / min for 1 minute, and then mixing at a speed of 1400 rev / min for 5 minutes;

[0052] (c) putting the material obtained in step (b) into a mold at 160 to 165° C. to press and unmold;

[0053] (d) heating the product obtained in step (c) to 120°C at a heating rate of 1°C / min in an oven, then drying at 120°C for 1 hour, drying at 130°C for 1 hour, and drying at 150°C for 2 hours , 160 ℃ drying for 4 hours, naturally cooled to below 80 ℃, discharging to obtain the corresponding synthetic brake shoe.

[0054] Table 1:

[0055]

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Abstract

The invention provides a zero-asbestos acrylate rubber-based synthetic brake shoe and its preparation method and application, wherein, in weight percentage, the zero-asbestos acrylate rubber-based synthetic brake shoe comprises: acrylate rubber 20-30%; carbonized Silicon fiber 25‑35%; alumina fiber 5‑15%; polyphenylene sulfide fiber 5‑15%; graphite 15‑25%; phenolic resin 2‑8%.

Description

technical field [0001] The invention belongs to the field of transportation, and in particular relates to a novel zero-asbestos acrylate rubber-based synthetic brake shoe and a preparation method and application thereof. Background technique [0002] Brake shoe refers to the braking part that directly rubs the wheels to stop the train when the train is running and braking. The synthetic brake shoe is a shoe-shaped brake pad made of rubber and phenolic resin as the matrix, fiber-reinforced and modified with other fillers. It hugs the tread of the wheel during braking and stops the wheel through friction. Before 2003, asbestos was used as fiber reinforcement in traditional synthetic friction materials for railways in my country. However, as people found that asbestos has carcinogenic effects, developed countries such as Europe and the United States are gradually reducing or even banning the use of asbestos. Since 2003, my country has also completely banned the use of asbestos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L33/04C08L81/02C08L61/06C08K7/10C08K7/08C08K3/04F16D69/02
CPCC08L33/04F16D69/02F16D69/028C08L2205/16C08L2201/02C08L2201/08F16D2200/003F16D2200/0052F16D2200/0056F16D2200/0065F16D2200/0086F16D2250/0023C08L81/02C08L61/06C08K7/10C08K7/08C08K3/04
Inventor 裴顶峰吉媛党佳贺春江韩欢热谢晓
Owner 铁科金化检测中心有限公司
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