Friction plate without asbestos and its preparation process

A friction lining and oil technology, applied in the direction of friction lining, mechanical equipment, etc., can solve the problems of high product cost, high temperature fracture, high hardness, and achieve the effect of stable friction coefficient, high mechanical strength and low thermal conductivity

Inactive Publication Date: 2005-06-08
李海 +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the friction performance of the semi-metallic friction material is good, it has problems such as large specificity, high hardness, easy damage to the paired parts used with it, and easy generation of sparks.
In addition, as disclosed in the CN90109408 patent, 10-25% short glass fibers and 10-25% polyacrylonitrile fibers are used to replace asbestos; the CN93102131 patent discloses to replace asbestos with 16% glass fibers and 4% Kevlar. Asbestos to improve the wear resistance of the material, but Kevlar is very expensive and the product cost is high, so it is not easy to popularize and apply
The performance of the materials disclosed in the above patents is comparable to that of the low-hardness (HB146-180) low-carbon steel brake disc counterparts used in new oil drilling rigs and mine hoists in the late 1990s and early 21st century. It is said that the friction plate made has defects such as high hardness, easy sparks, damage to the counterpart, high temperature fracture, etc., which cannot meet the requirements of use and is prone to adverse consequences

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Material ratio (percentage by weight): resin-rubber 29%, glass fiber 16%, organic fiber 5%, non-ferrous metal powder 8.2%, graphite 7%, wollastonite 4%, meerschaum 5%, cashew nut shell oil friction Powder 3%, petroleum coke powder 4.5%, zinc oxide 2%, magnesium oxide 1.5%, barium sulfate 5%, iron oxide 5%, vermiculite powder 2.5%, high alumina 1.5%, zinc stearate 0.8%, ethanol 15%. Production process method: weigh the above materials according to the proportion (resin-rubber mixture is masticated, kneaded into flakes, and crushed), mixed evenly with a Z-type kneader to form a soft wet material, added fiber material and mixed into a large piece Material, extruded or rolled into strip sheet material. The drying temperature is 70-85°C, the time is 2.5-3 hours, the volatile matter is 2.5-3%, the material is preheated at 110-130°C during pressing, the time is 10-15 minutes, the pressing mold temperature is 160±5°C, and the pressure is 15-20MPa. The molding time is 1-1.5 mi...

Embodiment 2

[0025] Material ratio (percentage by weight): resin-rubber mixture 27%, glass fiber 14%, organic fiber 6%, non-ferrous metal powder 10.5%, graphite 6%, wollastonite 4%, sepiolite fiber 5.5%, cashew nuts Shell oil friction powder 2.5%, petroleum coke powder 5.5%, zinc oxide 2%, magnesium oxide 1.5%, iron oxide 5%, vermiculite powder 2.5%, barium sulfate 5%, high alumina 1.5%, zinc stearate 0.8 %, ethanol 15%. The production method is the same as above.

[0026] The following shows the test results of the performance of the non-asbestos friction plate of the present invention. According to the JB / T3721-1999 standard issued by the Ministry of Machinery Industry - mine hoist brake shoe ministerial standard, all technical performances of the friction plate of the present invention have reached the standard. See the table below:

[0027]

[0028] 200℃

[0029] Test items

[0030] It can be seen from the above results that the asbestos-free friction...

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PUM

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Abstract

A non-asbestos friction disk for the brake of drilling machine, heavy machinery, etc is prepared from glass fibres, organic fibres, low-smelting-point metal powder and resin-rubber mixture. Its advantages are low hardness, high toughness, high friction coefficient, high mechanical strength, and low abrasion.

Description

technical field [0001] The invention relates to a non-asbestos friction plate, especially in the disc or drum brakes of oil drilling rigs, mine hoists, heavy construction machinery, etc., which is suitable for pairing with low hardness and low carbon steel brake disc counterparts piece. The invention also discloses a process for manufacturing the friction plate. Background technique [0002] After the 1920s, friction materials with asbestos and phenolic resin as the main raw materials were developed in the world, and they were used until the 1970s and 1980s. However, asbestos materials will produce asbestos dust in the process of production and brake wear, pollute the environment, have carcinogenic effect, and seriously threaten people's health. For this reason, as the substitute product of asbestos friction material, many non-asbestos friction materials have been researched and developed in the 1970s and 1980s at home and abroad, and have been found in patent reports. Fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/04C08J5/14C08L61/06F16D69/02
Inventor 李海程粉荣李龙振张顺波刘红军
Owner 李海
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