Composite friction material by using truck waste brake shoe friction material as filler and preparation method thereof

A technology of composite friction material and waste brake shoe, applied in the field of friction material and vehicle brake shoe, can solve the problems of difficult separation of steel back and composite friction material, high recovery cost, complex components, etc., and achieve stable friction coefficient and wear rate. Low, good heat recovery effect

Active Publication Date: 2015-02-11
CRRC SHIJIAZHUANG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is simply treated as solid waste, it will not only affect the environment, but also cause huge waste
[0007] Due to the difficulty in separating the steel back from the composite friction material, and its complex components and high recycling costs, there are currently no companies recycling friction materials, and there are few related researches at home and abroad.

Method used

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  • Composite friction material by using truck waste brake shoe friction material as filler and preparation method thereof
  • Composite friction material by using truck waste brake shoe friction material as filler and preparation method thereof
  • Composite friction material by using truck waste brake shoe friction material as filler and preparation method thereof

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preparation example Construction

[0039] The present invention also provides a preparation method of the above-mentioned composite friction material, such as figure 1 shown, including the following steps:

[0040] (1) Mixing: Prepare and mix the prepared raw materials in proportion, then add the phenolic resin matrix adhesive and stir;

[0041] (2), compression molding;

[0042] (3), curing treatment.

[0043] Preferably, the specific steps for preparing the above-mentioned composite friction material in proportion according to each raw material are as follows:

[0044] (1) Raw material preparation: dry each raw material at a temperature of 80-100°C for 1-2 hours for later use;

[0045] Stirring: first put the steel fiber, the friction material of the waste brake shoe of the truck and the additive into the mixer and mix it at a speed of 10,000 rpm for 1 to 10 minutes, then add the phenolic resin matrix adhesive and then mix it at a low speed of 120 rpm Stir the mixture for 0.5 to 2 hours;

[0046] (2) Co...

Embodiment 1

[0060] 1) Select the parts by weight of each component according to Table 1.

[0061]

[0062] 2) Dry the raw materials at 80°C for 1 hour, first put the steel fiber, the friction material of the waste truck brake shoe and various additives into the mixer and mix them at a speed of 10,000 rpm for 1 minute, then add the phenolic resin The matrix is ​​stirred and mixed at a low speed of 120 rpm for 0.5 hours;

[0063] 3) Hot pressing at 160°C, pressure 20 MPa, sample thickness 7mm, holding time 35 minutes, after hot pressing for 30 seconds, open the mold and exhaust once, and then open the mold and exhaust once every 1 minute, a total of 3 times . When the mold cools down to below 60°C, demould and cool to room temperature;

[0064] 4) Curing treatment: adopt stepwise heating curing process, heat preservation at 60°C for 30 minutes, heat preservation at 80°C for 30 minutes, heat preservation at 100°C for 0.5h, and heat preservation at 140°C for 12 hours.

[0065] 5) The f...

Embodiment 2

[0068] 1) Select the parts by weight of each component according to Table 3.

[0069]

[0070]

[0071] 2) Dry the raw materials at 80°C for 2 hours, first put the steel fiber, the friction material of the waste truck brake shoe and various additives into the mixer and mix them at a speed of 10,000 rpm for 5 minutes, then add the phenolic resin The matrix is ​​stirred and mixed at a low speed of 120 rpm for 1 hour;

[0072] 3) Hot pressing at 150°C, pressure 20 MPa, sample thickness 10mm, pressure holding time 50 minutes, after hot pressing for 30 seconds, open the mold and exhaust once, and then open the mold and exhaust once every 1 minute, a total of 3 times . When the mold cools down to below 60°C, demould and cool to room temperature;

[0073] 4) Curing treatment: adopt a stepwise heating curing process, heat preservation at 60°C for 30 minutes, heat preservation at 80°C for 30 minutes, heat preservation at 100°C for 0.5h, and heat preservation at 120°C for 12h.

...

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Abstract

The invention discloses a composite friction material by using a truck waste brake shoe friction material as a filler, relating to the technical fields of friction materials and vehicle brake shoes. The composite friction material comprises a resin matrix, a reinforcing fiber, a filler and assistants, wherein the resin matrix is a phenol formaldehyde resin, the filler is a truck waste brake shoe friction material, and the assistants comprise iron powder, an accelerator, molybdenum disulfide, stearic acid and graphite. The preparation method comprises the following steps: material preparation, stirring, compression molding and curing treatment. By utilizing the truck waste brake shoe friction material as the filler, combining the optimal selection and proportioning of the phenol formaldehyde resin, reinforcing fiber and other assistants and optimizing various parameters of the molding technique, the prepared composite friction material has the characteristics of stable friction factor, low heat fading, favorable thermal restorability, low wear rate and high carrying capacity, can be used for manufacturing multiple friction components, has excellent frictional wear performance, favorable bending strength and favorable impact toughness, and achieves favorable use effect.

Description

technical field [0001] The invention relates to the technical field of friction materials and vehicle brake shoes. Background technique [0002] The basic structure of brake shoes (brake pads) for vehicles consists of a steel back and a polymer composite friction material. Based on 700,000 railway freight cars (8 brake shoes per car), about 4 million discarded brake shoes are replaced each year, with a weight of 5,000 tons, of which about 2,500 tons are recycled from steel backs. Considering the brake pads used in road traffic vehicles, agricultural vehicles, industrial and mining machinery, etc., the amount of waste is huge. [0003] As industrial solid waste, discarded vehicle brake shoes (sheets) are mainly buried and backfilled at present. The polymers in them degrade for a long time, and the metals and inorganic rare earth fillers in them cause great changes to the soil and occupy a relatively large area. Large land resources, especially automobile brake pads contain ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L61/14C08K13/08C08K11/00C08K7/06C08K3/08C08K3/30C08K5/09C08K3/04
Inventor 付华孙宝臣孟兆军郭娜王彩辉杨晋辉张光磊秦国强于刚姬红姚利敏
Owner CRRC SHIJIAZHUANG CO LTD
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