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Environment-friendly braking friction material and preparation method thereof

A brake friction material, an environment-friendly technology, applied in the field of brake friction materials and its preparation, can solve problems such as soil pollution, water resource hazards, unfavorable plant growth, etc., and achieve the effect of reducing dust pollution

Inactive Publication Date: 2010-06-23
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (2) Heavy metal elements: ① Lead, chromium, mercury, and nickel are human carcinogens identified by the International Agency for Research on Cancer, and they also pose a great hazard to water resources. Fly ash (a kind of industrial solid waste) contains trace amounts of heavy metals 2. Copper fiber and copper powder are the main sources of solid copper emissions in the air, which seriously pollute water resources; 3. Antimony trisulfide is the main source of solid antimony emissions in the air; 4. Waste tire rubber powder ( An industrial solid waste), the zinc contained in the dust is harmful to organisms in the water; ⑤ palygorskite fiber (hydrous magnesium aluminum silicate), the release of magnesium will cause soil pollution and be harmful to plant growth
[0006] (4) Antimony trioxide (commonly used lubricant for friction materials), which is the product of oxidation reaction during the friction process, may have carcinogenic effect
However, the environmental problems caused by raw materials other than asbestos are not fully recognized

Method used

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  • Environment-friendly braking friction material and preparation method thereof
  • Environment-friendly braking friction material and preparation method thereof
  • Environment-friendly braking friction material and preparation method thereof

Examples

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example 1

[0048] Preparation of natural plant fibers

[0049]The natural plant fiber is washed with water, dried, chopped to 2-4mm, then soaked in 12% sodium hydroxide aqueous solution for 2-4h, and then the lye is washed away, and dried. Steam the chopped fibers with 1mol / L hydrochloric acid vapor for 30-60min, wash off the acid solution, and dry. Cook the chopped fiber with 2% sodium hydroxide solution at 80°C for 2-4 hours, then wash off the lye and dry it. The chopped fibers were steamed in a pressure cooker for 30 minutes and dried. High-pressure steam treatment is beneficial to the microfibrillation of natural plant fibers ( figure 1 ). Hydrochloric acid vapor treatment is beneficial to the length of natural plant fibers ( figure 2 ), overcome the shortcoming of shortening the length of natural plant fibers with conventional hydrochloric acid solution. Chemical (alkali, acid) treatment is beneficial to improve the thermal stability of natural plant fibers ( image 3 ).

[...

Embodiment 1

[0057] Preparation of environmentally friendly brake friction material containing flax

[0058] Formula (measured by volume fraction): flax fiber 9.0%, acicular limestone 28.8%, basalt fiber 8.0%, zircon 8.0%, barite 13.0%, vermiculite 5.0%, graphite 8.0%, cashew phenolic benzo Oxazine 5.6%, phenolic resin 14.6%. Measure all raw materials, granules and phenolic resin according to the formula, then stir in the high-speed mixer for 20-30 seconds, stop for 30-60 seconds, repeat 3-5 times, and control the total stirring time at 3-8 minutes to make the mixture evenly dispersed . Put the mixed material into a hot-press molding machine for hot-pressing. The hot-pressing temperature is 155-170° C., the pressure is 4-10 MPa, and the air is released 2-4 times. The hot-pressing time is 4-6 minutes in total. The molding is put into an oven for heat treatment, and kept at a temperature of 170-180° C. for 3-4 hours to obtain an environment-friendly braking friction material containing fla...

Embodiment 2

[0060] Preparation of environmentally friendly braking friction material containing ramie

[0061] Formula (measured by volume fraction): ramie fiber 9.0%, acicular limestone 28.8%, basalt fiber 8.0%, zircon 8.0%, barite 13.0%, vermiculite 5.0%, graphite 8.0%, cashew phenolic benzo Oxazine 5.6%, phenolic resin 14.6%. The preparation conditions of the brake friction material remain unchanged, and an environment-friendly brake friction material containing ramie is obtained.

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PUM

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Abstract

The invention provides an environment-friendly braking friction material containing natural plant fiber, natural mineral fiber, natural mineral powder and cardanol-based benzoxazine modified phenolic resin and a preparation method thereof. The natural plant fiber is one or a plurality of flax, ramie, jute, hemp and sisal processed by a chemical method (alkali and acid) and a physical method (high-pressure steam), the natural mineral fiber comprises needle-like limestone and basalt fiber, and the natural mineral powder comprises zircon, barite, vermiculite and graphite. The invention also provides a preparation method of the natural mineral powder and cardanol-based benzoxazine pellet and a preparation method of cardanol-based benzoxazine in-situ toughening phenolic resin.

Description

technical field [0001] The present invention relates to a natural plant fiber (including flax, ramie, jute, hemp, sisal), natural mineral fiber (including basalt, acicular wollastonite), natural mineral filler (including zircon, barite, Vermiculite, graphite), cardanol type benzoxazine modified phenolic resin brake friction material and its preparation method. Background technique [0002] Phenolic resin-based brake friction materials are widely used in automobile brake linings. They are multi-component, multi-phase composite materials (generally containing 7-20 kinds of raw materials), which are composed of phenolic resin matrix, fiber reinforcement and filler. During the production process of brake friction materials, a large amount of dust will be generated, which is harmful to human health. During the use of the brake friction material, in order to protect the friction couple (usually cast iron friction disc) from being damaged, it sacrifices itself and is worn, which i...

Claims

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Application Information

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IPC IPC(8): C08L61/14C08L97/02C08K13/04C08K7/04C08K9/04C08J5/14B29C43/58
Inventor 吕亚非索宝霆鲁贻梅王慧
Owner BEIJING UNIV OF CHEM TECH
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