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Linseed oil modified phenol formaldehyde resin for friction material and its preparation method

A technology of linseed oil modification and phenolic resin, which is applied in the field of friction composite materials, can solve the problems of difficult stability of modified phenolic resin, poor high-temperature performance of phenolic resin, cumbersome purification process, etc., and achieve performance and environmental benefits. Excellent heat resistance and friction and wear performance, easy purification effect

Inactive Publication Date: 2006-03-29
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In summary, the methods of toughening and modifying phenolic resins reported in the literature include two methods: internal toughening and external toughening. Tung oil and cashew nut shell oil are commonly used for internal toughening, but these two raw materials need to be cumbersome before use. Purification treatment process, the obtained modified phenolic resin performance is difficult to stabilize
The external toughening is mainly modified by rubber and thermoplastic resin, but the modified phenolic resin obtained by these two methods has poor high-temperature performance, and its use as a friction composite material matrix is ​​greatly limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 100g of phenol and 0.15g of p-toluenesulfonic acid into the reaction kettle, slowly add 45g of linseed oil under rapid stirring, raise the temperature to 135°C, and react for 2 hours, stop heating and cool to room temperature under stirring to obtain the linseed oil-phenol reaction Under the condition of heating and stirring, add 126g of formaldehyde, stir well and add 4.5g of ammonia water, slowly raise the temperature to 115°C, when the reactant appears yellow and turbid, cool it, and start vacuum dehydration until 50°C, when the resin liquid turns brown When transparent, stop dehydration, add absolute ethanol and stir to dissolve, cool to room temperature and discharge to obtain 248g linseed oil modified phenolic resin.

Embodiment 2

[0030] Add 100g of phenol and 0.17g of p-toluenesulfonic acid into the reaction kettle, slowly add 50g of linseed oil under rapid stirring, raise the temperature to 140°C, and after 3 hours of reaction, stop heating and cool to room temperature under stirring to obtain the linseed oil-phenol reaction Under the condition of heating and stirring, add 130g of formaldehyde, add 6g of ammonia water after stirring evenly, slowly raise the temperature to 105°C, when the reactant appears yellow and turbid, cool it down, and start vacuum dehydration until 50°C, when the resin liquid turns brown and transparent , stop dehydration, add absolute ethanol and stir to dissolve, cool to room temperature and discharge to obtain 256g linseed oil modified phenolic resin.

Embodiment 3

[0032] Add 100g of phenol and 0.20g of p-toluenesulfonic acid into the reaction kettle, slowly add 55g of linseed oil under rapid stirring, raise the temperature to 145°C, and react for 4 hours, stop heating and cool to room temperature under stirring to obtain the linseed oil-phenol reaction Under the condition of heating and stirring, add 135g of formaldehyde, stir well and add 7.5g of ammonia water, slowly raise the temperature to 110°C, when the reactant appears yellow and turbid, cool it, and start vacuum dehydration until 50°C, when the resin liquid turns brown When it is transparent, stop dehydration, add absolute ethanol and stir to dissolve, cool to room temperature and discharge to obtain 252 g of linseed oil modified phenolic resin.

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PUM

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Abstract

A flax oil modified phenolic resin for friction material is prepared through proportionally mixing phenol with methylphenylsulfonic acid, stirring, adding flax oil, heating, reacting, cooling while stirring, heating while adding formaldehyde, stirring, adding ammonia water, slow heating until yellow turbid presents, cooling to 50 deg.C, vacuum dewatering until it become transparent, adding absolute alcohole, stirring while dissolving, and cooling, It has high thermal stability.

Description

technical field [0001] The invention relates to the field of friction composite materials, in particular to a novel friction material modified phenolic resin with linseed oil and a preparation method thereof, which is widely used in clutches and brakes of automobiles, trains and other vehicles and engineering machinery. Dynamic brake pads, used as electromagnet filling materials in electromagnetic brakes, provide friction factors. Background technique [0002] Phenolic resin has good heat resistance and mechanical properties, easy to obtain raw materials, cheap price, simple process and production equipment, and has always been the most important matrix of friction materials. However, the unmodified phenolic resin has defects such as high brittleness and poor toughness. Therefore, more than half of the phenolic resin must be modified to expand its application range. The toughening modification of phenolic resin reported in the literature has the following methods: [0003]...

Claims

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Application Information

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IPC IPC(8): C08G8/32
Inventor 袁新华程晓农陈敏邵美秀汪建敏陈正南
Owner JIANGSU UNIV
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