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A method capable of improving wet braking performance of microporous friction material

A friction material and microporous technology, applied in the field of friction materials, can solve the problems of endangering the driving safety of subway vehicles, unstable wet friction coefficient, metal inlay and large wear, etc., to prolong the service life, and stabilize the friction coefficient. long life effect

Active Publication Date: 2021-01-29
SHANGHAI REINPHEN NEW MATERIAL TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main problems of subway brake shoes are: unstable friction coefficient in wet state, thermal cracks, high noise, metal inlay and high wear, etc. Especially in rainy and snowy weather, the road surface is relatively slippery, the existing synthetic brake shoes There is a low wet friction coefficient and an unstable friction coefficient, which will seriously endanger the safety of subway vehicles
[0004] Chinese patent CN103665746B discloses a microporous friction material with low wear and high stability coefficient and its manufacturing method, but the friction coefficient of this patented material is only above 0.25 in wet state, and the stability coefficient on the MM-1000 testing machine is only 85 %above

Method used

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  • A method capable of improving wet braking performance of microporous friction material
  • A method capable of improving wet braking performance of microporous friction material
  • A method capable of improving wet braking performance of microporous friction material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A method capable of improving the wet braking performance of a microporous friction material, comprising adding a hydrophobic agent to the components of the microporous friction material, specifically comprising the following steps:

[0050] (1) The preparation of raw materials, including the following components and weight percentages:

[0051]

[0052] (2) Preparation:

[0053] The above-mentioned raw materials are mixed in a high-speed mixer in sequence in proportion; the steel back and the mixture are placed in a mold for compression molding to obtain a blank; the blank is heated and solidified in an oven, and finally machined to obtain a brake shoe .

[0054] Mixing material: Add each component into a high-speed mixer in proportion to mix and stir, the speed is 2500r / min, and the time is 25min;

[0055] Pressing: Put the mixture and steel back into the mold for pressing, the mold temperature is 60°C, the molding pressure is 20MPa, deflate 5 times within 10 min...

Embodiment 2

[0060] A method capable of improving the wet braking performance of a microporous friction material, comprising adding a hydrophobic agent to the components of the microporous friction material, specifically comprising the following steps:

[0061] (1) The preparation of raw materials, including the following components and weight percentages:

[0062]

[0063]

[0064] (2) Preparation:

[0065] The above-mentioned raw materials are mixed in a high-speed mixer in sequence in proportion; the steel back and the mixture are placed in a mold for compression molding to obtain a blank; the blank is heated and solidified in an oven, and finally machined to obtain a brake shoe .

[0066] Mixing material: Add each component into a high-speed mixer in proportion to mix and stir, the speed is 2500r / min, and the time is 30min;

[0067] Pressing: Put the mixture and steel back into the mold for pressing, the mold temperature is 80°C, the molding pressure is 25MPa, deflate 10 times ...

Embodiment 3

[0072] A method capable of improving the wet braking performance of a microporous friction material, comprising adding a hydrophobic agent to the components of the microporous friction material, specifically comprising the following steps:

[0073] (1) The preparation of raw materials, including the following components and weight percentages:

[0074]

[0075]

[0076] (2) Preparation:

[0077] The above-mentioned raw materials are mixed in a high-speed mixer in sequence in proportion; the steel back and the mixture are placed in a mold for compression molding to obtain a blank; the blank is heated and solidified in an oven, and finally machined to obtain a brake shoe .

[0078] Mixing material: Add each component into a high-speed mixer in proportion to mix and stir, the speed is 2500r / min, and the time is 35min;

[0079] Pressing: Put the mixture and steel back into the mold for pressing, the mold temperature is 100°C, the molding pressure is 30MPa, deflate 7 times ...

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Abstract

The invention relates to a method capable of improving the wet braking performance of a microporous friction material. Hydrophobic agents are added to the components of the microporous friction material. The microporous friction material consists of the following components and raw materials in weight percentage: Made of: nano-silica modified phenolic resin 10%-20%, styrene-butadiene rubber 4%-14%, glass fiber 5%-15%, aramid pulp 2%-11%, aluminum borate whisker 4% ‑15%, hydrophobic agent 4%‑10%, calcium silicate 3%‑8%, artificial graphite 1%‑8%, coke 2%‑8%, mica 2%‑7%, cryolite 5%‑10% , Diatomaceous earth 4%‑10%. Compared with the prior art, the microporous brake shoe prepared by the present invention has a high and stable friction coefficient in a wet state, which greatly improves the wet braking performance of the brake shoe, improves thermal decay, and has no metal inlay on the brake shoe. Low noise, good wear resistance, prolong the service life of the brake shoe, and at the same time ensure that the friction material does not cause abnormal wear on the wheel tread.

Description

technical field [0001] The invention relates to a friction material, in particular to a method capable of improving the wet braking performance of the microporous friction material. Background technique [0002] With the safe, heavy-duty and high-speed development of urban rail transit in my country, synthetic brake shoes with high friction coefficient have become an important part of the braking system of rail transit vehicles in my country. Synthetic brake shoes with high friction coefficient are referred to as high-friction synthetic brake shoes. They are mainly composed of friction body and steel back. The friction body is the key part of the brake shoe. It is composed of binder, reinforcing material and filler (friction performance regulator). , When braking, the friction between the brake shoe and the wheel tread achieves the purpose of deceleration and braking. The physical, mechanical and friction properties of brake shoe materials directly affect the use of brake s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16D69/02
CPCC04B26/122C09K3/14C04B2111/00362C04B24/2611C04B14/42C04B16/06C04B14/383C04B22/08C04B14/024C04B14/022C04B14/20C04B22/126C04B14/08C04B2103/65F16D69/026F16D2200/0065F16D65/04F16D2200/0052F16D2200/0056F16D2200/0069F16D2200/0095F16D2250/0023F16D2250/0038
Inventor 张定权李羲宸
Owner SHANGHAI REINPHEN NEW MATERIAL TECH CO LTD
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