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Modified phenolic resin adhesive for friction material and preparation method for modified phenolic resin adhesive

A phenolic resin, friction material technology, applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc. effect and other issues, to achieve the effect of enhancing thermal recession resistance, excellent friction performance, and prolonging service life

Active Publication Date: 2012-06-27
HUANGSHI JINZHAOYANG POWDER MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high brittleness of the unmodified phenolic resin, and the phenolic hydroxyl and methylene of the phenolic resin are easily oxidized, its heat resistance is affected.
[0003] At present, in order to improve the heat resistance of phenolic resin, amines such as melamine and aniline are commonly used for modification, but due to the poor solubility of amines (especially melamine and aniline) in the acidic aqueous solution system, it is difficult to completely react, so it affects modified effect

Method used

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Examples

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Effect test

preparation example Construction

[0022] The modified phenolic resin adhesive for friction materials provided in the embodiments of the present invention and its preparation method comprise the following steps:

[0023] A. Mix 100 parts of phenol, 60-120 parts of formaldehyde solution with a mass percentage of 37%, 2-20 parts of amines, and 8-40 parts of cardanol according to the parts by mass, and add 1-20 parts of composite catalyst dropwise , the dropwise addition is completed within 1 hour (the composite catalyst can be added at one time or in the form of dropwise addition, preferably in the form of dropwise addition), the temperature is raised to 80° C. to 105° C., and the reaction is performed at a constant temperature for 0.5 to 2 hours. The composite catalyst is a mixture of organic acid and inorganic salt, the organic acid is at least one of acetic acid, oxalic acid, trifluoroacetic acid, methyl silicic acid and ethyl silicic acid, and the inorganic salt is a compound containing manganese, copper, zinc...

Embodiment 1

[0028] Embodiment 1: add composite catalyst at one time

[0029] 100.0g phenol, 20.0g cardanol, 100.0g mass percentage are 37% formaldehyde solution, 10.0g melamine, 1.0g composite catalyst (0.02g oxalic acid, 0.05g methyl silicic acid, 0.03g manganese sulfate) in one go In a reaction vessel equipped with a thermometer, stirring, and reflux condensing device, heat slowly to 80°C and react at a constant temperature for 0.5h.

[0030] Then, 3.0 ml of 1 mol / L hydrochloric acid and 2.0 g of silicic acid were added, and the constant temperature reaction was continued for 60 min to obtain an orange-yellow milky sticky substance. Wash the orange-yellow milky viscous material twice with warm water at 60°C, then dry and dehydrate, first dry and dehydrate under normal pressure at a temperature of 120°C, and then decompress under a vacuum of 0.05MPa and a temperature of 120°C Drying and dehydration give cardanol and melamine modified phenolic resin adhesive.

[0031] Crush the resin ad...

Embodiment 2

[0034] 100.0g phenol, 15.0g cardanol, 100.0g mass percent are 37% formaldehyde solution, 20.0g aniline join in the reaction vessel with thermometer, stirring, reflux condensation device, 5.0g composite catalyst (1.00g oxalic acid, 2.00g Acetic acid, 2.00g of zinc acetate) was added dropwise into the reaction system at a rate of 0.09g / min, and the dropwise addition was completed within 1 hour, then slowly heated to 90°C, and reacted at a constant temperature for 1h.

[0035] Then 5.0ml of 1mol / L hydrochloric acid and 1.0g of p-toluenesulfonic acid were added, and the constant temperature reaction was continued for 1h to obtain an orange-yellow milky sticky substance. The orange-yellow milky viscous substance was washed three times with warm water at 60°C, first dried and dehydrated under normal pressure at a temperature of 120°C, and then dried and dehydrated under reduced pressure at a vacuum degree of 0.06MPa and a temperature of 120°C to obtain Cardanol, aniline modified phe...

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Abstract

The invention discloses a modified phenolic resin adhesive for a friction material and a preparation method for the modified phenolic resin adhesive. The method comprises the following steps of: mixing 100 mass parts of phenol, 60 to 120 mass parts of 37 mass percent formaldehyde solution, 2 to 20 mass parts of amine substance and 8 to 40 mass parts of cardanol uniformly, dripping 1 to 20 parts of composite catalyst, heating to the temperature of between 80 and 105 DEG C, and performing constant-temperature reaction for 0.5 to 2 hours; and adding 0 to 10 parts of acid catalyst, continuously performing constant-temperature reaction for 1 to 2 hours to obtain orange milky dope, washing the orange milky dope for 2 to 5 times in water of 60 to 70 DEG C, drying, dehydrating, and thus obtaining the cardanol and amine substance modified phenolic resin adhesive. The amine substance can be well dissolved, so that the reaction rate is quickened; the toughness of the modified phenolic resin adhesive is further enhanced by adding powdery nitrile rubber; and the friction material prepared by using the modified phenolic resin adhesive has the advantages of low abrasion rate, long service life, high toughness, high-temperature resistance, high-strength impact resistance and low noise.

Description

technical field [0001] The invention relates to the field of modification of phenolic resins, in particular to a modified phenolic resin adhesive for friction materials and a preparation method thereof. Background technique [0002] Phenolic resin is the earliest industrialized synthetic resin. It has the characteristics of easy to obtain raw materials, convenient synthesis and low price. It has good mechanical properties, weather resistance, corrosion resistance, water resistance and certain heat resistance, so it is widely used in For molding compounds, adhesives, coatings and other industries. However, due to the high brittleness of the unmodified phenolic resin, and the phenolic hydroxyl and methylene of the phenolic resin are easily oxidized, its heat resistance is affected. [0003] At present, in order to improve the heat resistance of phenolic resin, amines such as melamine and aniline are commonly used for modification, but due to the poor solubility of amines (esp...

Claims

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Application Information

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IPC IPC(8): C09J161/34C09J109/02C08G14/10C08G14/073C08J5/14
Inventor 袁文来夏涛
Owner HUANGSHI JINZHAOYANG POWDER MATERIALS
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