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Environment-friendly cardanol, urea synergistically modified phenolic resin and application thereof to high temperature resistant friction material

A friction material and phenolic resin technology, applied in other chemical processes, chemical instruments and methods, etc., can solve the problems of high brittleness, insufficient heat resistance, and susceptibility to oxidation of phenolic resin, and improve heat resistance and toughness. The effect of short time and low process temperature

Inactive Publication Date: 2014-10-15
谢再锋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the weak link in the structure of phenolic resin is that the phenolic hydroxyl group and methylene are easily oxidized, resulting in high brittleness, poor toughness and insufficient heat resistance of phenolic resin.

Method used

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  • Environment-friendly cardanol, urea synergistically modified phenolic resin and application thereof to high temperature resistant friction material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] An environmentally friendly double-modified phenolic resin for high-temperature resistant friction materials, the material components are 516 parts of phenol, 344 parts of cardanol, 645 parts of solid paraformaldehyde, 688 parts of urea, 16.34 parts of barium hydroxide, and 200 parts of ethanol.

[0031] Its preparation method comprises the following steps:

[0032] First, add 645 parts of paraformaldehyde, 516 parts of molten phenol, and 16.34 parts of barium hydroxide into a clean reactor equipped with a stirrer, reflux condenser and thermometer, and adjust the pH value between 8.1 and 8.2. Heat while stirring until the temperature rises to 65°C, then keep it warm for 60-70 minutes, and turn off the heating device.

[0033] When the temperature of the solution in the reactor drops from 65°C to 50°C, add urea immediately, and adjust the pH value of the solution to 3 with a saturated oxalic acid solution, raise the temperature to 75°C, the phenolic polycondensation reac...

Embodiment 2

[0035] An environmentally friendly double-modified phenolic resin for high-temperature resistant friction materials, the material components are 516 parts of resorcinol, 344 parts of cardanol, 645 parts of solid paraformaldehyde, 688 parts of urea, 16.34 parts of ammonia water, and 200 parts of ethanol.

[0036] Its preparation method is similar to that of Example 1, except that resorcinol is used instead of phenol, and ammonia water is used instead of barium hydroxide solution.

Embodiment 3

[0038] An environmentally friendly double-modified phenolic resin for high-temperature resistant friction materials, the material components are 516 parts of phenol, 344 parts of cardanol, 645 parts of solid paraformaldehyde, 688 parts of urea, 18.06 parts of barium hydroxide, and 200 parts of ethanol.

[0039] Its preparation method comprises the following steps:

[0040] First, add 645 parts of paraformaldehyde, 516 parts of molten phenol, and 18.06 parts of barium hydroxide into a clean reactor equipped with a stirrer, reflux condenser and thermometer, and adjust the pH value between 8.1 and 8.2. Heat while stirring until the temperature rises to 70°C, then keep it warm for 60-70 minutes, and turn off the heating device.

[0041] When the temperature of the solution in the reactor drops from 65°C to 50°C, urea is added immediately, and the pH value of the solution is adjusted to 4 with p-toluenesulfonic acid solution, and the temperature is raised to 75°C. The phenolic poly...

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Abstract

The invention belongs to the technical field of high polymer material, and more specifically relates to a method for preparation of an environment-friendly high temperature resistant friction material from cardanol and urea double-modified phenolic resin. The specific steps are as follows: first, mixing solid paraformaldehyde, cardanol and phenol in the presence of an alkaline catalyst, regulating the pH value to 8.0-9.0, heating to 60-80 DEG C and insulating and reacting for 60-80 min; and then adding modified urea when the temperature drops to 45-50 DEG C, then regulating the pH value to 2-4 in the presence of an acid catalyst, heating to 75 DEG C, insulating for 90 min, and adjusting the pH value to 7 by an alkaline solution; and finally, conducting vacuum dewatering, adding ethanol diluted resin, mixing evenly and discharging. The invention also relates to preparation of a high temperature resistant friction material. A preparation method is characterized by comprising the steps of: mixing 10wt%-20wt% of an adhesive of modified phenolic resin, 5wt%-15wt% of a modifier of rubber, 0.5wt%-5wt% of a curing agent hexamethylenetetramine, 25wt%-35wt% of a fiber reinforced material and 35wt%-45wt% of a filler, and pressing to obtain a finished product; and conducting heat treatment on the finished product to obtain the heat resistant friction material.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a preparation method of cardanol and urea synergistically modified phenolic resin for an environment-friendly high-temperature-resistant friction material and a preparation method of a high-temperature-resistant friction material. Background technique [0002] Phenolic resin is the first polymer resin to be synthesized and industrialized. Because the product has excellent mechanical properties, heat resistance, cold resistance, electrical insulation, dimensional stability, molding processing type, flame retardancy and low smoke, it is widely used. Used in electrical appliances, machinery, electronics, casting, aviation, aerospace, military, national defense and other fields. However, the weak link in the structure of phenolic resin is that the phenolic hydroxyl group and methylene are easily oxidized, resulting in high brittleness, poor toughness and insuffi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/28C08J5/14C08L61/14C09K3/14
Inventor 谢再锋唐盟
Owner 谢再锋
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