Preparation method of boron-containing phenolic resin for friction materials

A technology of boron phenolic resin and friction material, which is applied in the field of preparation of boron phenolic resin for friction materials, can solve the problems of inability to apply friction materials, limit wide application, and lack of fluidity, and achieve easy promotion, improved heat resistance, and wear resistance low rate effect

Inactive Publication Date: 2012-10-24
XIANGFAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the high temperature resistance modification of phenolic resin has become a research hotspot in the field of friction materials. Boron phenolic resin has good high temperature resistance and is considered to be one of the most successful modified phenolic resin varieties. However, due to its poor processing performance, it is limited. Wide application in high-tech fields
At present, the commercially available boron phenolic resin cannot be used in the actual production of friction materials due to its lack of fluidity

Method used

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  • Preparation method of boron-containing phenolic resin for friction materials
  • Preparation method of boron-containing phenolic resin for friction materials
  • Preparation method of boron-containing phenolic resin for friction materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Add 128.5g of phenol into a 500mL three-necked flask equipped with a condenser, a thermometer, and an electric stirrer, heat up to 40°C, then add 100.7g of formaldehyde solution (37% aqueous solution), and use 0.1mol / L of oxalic acid solution Adjust the pH value of the solution in the three-necked flask to 2-3, gradually raise the temperature to reflux temperature of 104°C and react for 1 hour, then add 0.1mol / L hydrochloric acid solution to the system dropwise every five minutes to adjust the pH value of the solution to 2-3, After reacting for 0.5 h, adjust the pH value of the solution to about 7-8 with 0.1 mol / L sodium hydroxide solution to terminate the reaction.

[0021] (2) Add 17.1g of boric acid to the product obtained in step (1), heat to reflux temperature, decompress and dehydrate after 0.5h of reaction, the vacuum degree is 0.01~0.06MPa, and the liquid in the three-hole bottle becomes viscous gradually, and It is yellow-green, the reaction is stopped, and...

Embodiment 2

[0023] (1) Add 30g of phenol into a 500mL three-necked flask equipped with a condenser, a thermometer, and an electric stirrer, heat up to 40°C, then add 23.5g of formaldehyde solution (37% aqueous solution), and use 0.1mol / L p-toluenesulfonate Adjust the pH value of the solution in the three-necked flask to 2-3 with the acid solution, gradually raise the temperature to reflux temperature of 104°C for 1 hour, and then add 0.1mol / L hydrochloric acid solution to the system every five minutes to adjust the pH value of the solution to 2-3 3. After reacting for 0.5h, use 0.1mol / L potassium hydroxide solution to adjust the pH value of the solution to about 7-8 to terminate the reaction.

[0024] (2) Add 5g of boric acid to the product obtained in step (1), heat to reflux temperature, and dehydrate under reduced pressure after 0.5h of reaction. The vacuum degree is 0.01-0.06MPa. Green, the reaction is stopped, and the discharged material is cooled to obtain the desired product.

Embodiment 3

[0026] (1) Add 85g of phenol into a 500mL three-necked flask equipped with a condenser, a thermometer, and an electric stirrer, raise the temperature to 40°C, then add 66.7g of formaldehyde solution (37% aqueous solution), adjust with 0.1mol / L phosphoric acid solution When the pH value of the solution in the three-necked flask reaches 2-3, gradually heat up to the reflux temperature of 104°C and react for 1 hour, then add 0.1mol / L sulfuric acid solution to the system dropwise every five minutes to adjust the pH value of the solution to 2-3, and react After 0.5 h, use 0.1 mol / L sodium hydroxide solution to adjust the pH value of the solution to about 7-8 to terminate the reaction.

[0027] (2) Add 11.5g of boric acid to the product obtained in step (1), heat to reflux temperature, decompress and dehydrate after 0.5h of reaction, the vacuum degree is 0.01~0.06MPa, and the liquid in the three-hole bottle becomes viscous gradually, and It is yellow-green, the reaction is stopped, ...

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Abstract

The invention discloses a preparation method of a boron-containing phenolic resin for friction materials, used for preparing the boron-containing phenolic resin. The method adopts a two-stage process, characterized by firstly reacting phenol with formaldehyde under the effect of acid catalysis to generate a phenolic resin with small molecular weight, and reacting the phenolic resin with small molecular weight with boric acid to generate a boron modified phenolic resin. By adjusting the ratio of raw materials, controlling the reaction temperature, time and other conditions, the boron modified phenolic resin is obtained. Various technical indicators of the boron-containing phenolic resin of the invention all meet the requirements of phenolic resin for friction materials GB/T2441-2009. Compared with the common phenolic resin, the friction materials prepared by using the boron-containing phenolic resin of the invention as a binder of friction materials have better high temperature stability of the friction coefficient and lower wear rate. The preparation method of the invention is similar to the process of the common phenolic resin, and the method is easy to popularize and apply.

Description

technical field [0001] The invention relates to the technical field of resin materials, in particular to a preparation method of boron phenolic resin for friction materials. Background technique [0002] Friction materials are usually composed of binders, fiber reinforcements, friction modifiers and fillers. Phenolic resin and its modified products are the most basic binders of friction materials, and they are also the components with the worst chemical properties and thermal stability in friction materials. Their properties directly affect the thermal decay performance, recovery performance and wear performance of friction materials. and mechanical properties. At present, vehicles are developing in the direction of high speed and heavy load, which puts forward higher and higher requirements for the temperature resistance of friction materials. Therefore, the high temperature resistance modification of phenolic resin has become a research hotspot in the field of friction m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/28C09K3/14
Inventor 李本林汪万强
Owner XIANGFAN UNIVERSITY
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