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Water-soluble phenolic resin solution for woven friction materials and preparation method thereof

A water-soluble phenolic resin and friction material technology, which is applied in chemical instruments and methods, and other chemical processes, can solve the problems of friction material friction coefficient reduction, high brittleness of phenolic resin, and threat to safe operation, etc., to improve wear resistance, Strong adsorption performance, effect of improving heat resistance

Active Publication Date: 2014-06-11
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the decomposition temperature of water-soluble phenolic resin is about 250°C, and its heat resistance is low. During the friction process, the temperature on the surface of the friction material is relatively high. A layer of gaseous or liquid film is formed on the surface of the friction material, resulting in a decrease in the friction coefficient of the friction material, which poses a greater threat to the safe operation of vehicles and other mechanical equipment in severe cases; in addition, due to the high brittleness of water-soluble phenolic resin, water-soluble phenolic resin The pulp impregnated fiber prepared by resin tends to fall off from the surface of the fiber after drying
[0004] In order to overcome the defects of insufficient heat resistance and high brittleness of water-soluble phenolic resin, it is necessary to modify the water-soluble phenolic resin to improve its heat resistance and toughness, so as to meet the actual needs of friction materials

Method used

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  • Water-soluble phenolic resin solution for woven friction materials and preparation method thereof

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Embodiment 1

[0028] In this embodiment, the modified water-soluble phenolic resin solution is composed of polyvinyl alcohol-modified phenolic resin aqueous solution, nano-scale attapulgite and micron-scale copper powder; The aqueous resin solution is formed by mixing 100 parts by mass of phenol, 115 parts by mass of formaldehyde solution with a concentration of 37% by mass, 5 parts by mass of polyvinyl alcohol with a degree of polymerization of 1700, and 5 parts by mass of basic catalyst NaOH; The polyvinyl alcohol-modified phenolic resin aqueous solution contains 100 parts by mass of phenol, 2 parts by mass of nano-scale attapulgite with a length of 0.5um~5um, a width of 15nm~30nm, and a particle size of 0.5um~2um. 1 mass part of micron copper powder.

[0029] The preparation method of the water-soluble phenolic resin solution of above-mentioned modification comprises the steps:

[0030] (1) Put 5 parts by mass of polyvinyl alcohol with a degree of polymerization of 1700, add 8 parts by ...

Embodiment 2

[0040] In this embodiment, the modified water-soluble phenolic resin solution is composed of polyvinyl alcohol-modified phenolic resin aqueous solution, nano-scale attapulgite and micron-scale copper powder; The aqueous resin solution is made of 100 parts by mass of phenol, 118 parts by mass of formaldehyde solution with a concentration of 37% by mass, 6 parts by mass of polyvinyl alcohol with a degree of polymerization of 1750, and 8 parts by mass of a basic catalyst Ba(OH) 2 mixed reaction According to the content of 100 parts by mass in the phenolic resin aqueous solution modified by polyvinyl alcohol, it contains 1.5 parts by mass of nano-scale attapulgite with a length of 0.5um ~ 5um and a width of 15nm ~ 30nm, and a particle size of 0.5 2 parts by mass of micron copper powder of um~2um.

[0041] The preparation method of the water-soluble phenolic resin solution of above-mentioned modification comprises the steps:

[0042] (1) Add 6 parts by mass of polyvinyl alcohol wi...

Embodiment 3

[0052] In this embodiment, the modified water-soluble phenolic resin solution is composed of polyvinyl alcohol-modified phenolic resin aqueous solution, nano-scale attapulgite and micron-scale copper powder; The aqueous resin solution is formed by mixing 100 parts by mass of phenol, 112 parts by mass of formaldehyde solution with a concentration of 37% by mass, 4 parts by mass of polyvinyl alcohol with a degree of polymerization of 1500, and 8 parts by mass of basic catalyst NaOH; The phenol content in the polyvinyl alcohol-modified phenolic resin aqueous solution is 100 parts by mass, containing 1 part by mass of nano-scale attapulgite with a length of 0.5um~5um, a width of 15nm~30nm, and a particle size of 0.5um~2um. 1.5 parts by mass of micron copper powder.

[0053] The preparation method of the water-soluble phenolic resin solution of above-mentioned modification comprises the steps:

[0054] (1) Put 4 parts by mass of polyvinyl alcohol with a degree of polymerization of...

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Abstract

The invention provides a water-soluble phenolic resin solution for woven friction materials and a preparation method thereof. According to the water-soluble phenolic resin solution, polyvinyl alcohol, nano attapulgite and micro copper powder are utilized to modify the water-soluble phenolic resin. In the synthesis technique of the water-soluble phenolic resin solution, a small amount of polyvinyl alcohol is added to enhance the water solubility, bonding property and toughness of the resin; and meanwhile, the nano attapulgite and micro copper powder granules are added to enhance the heat resistance and wear resistance of the resin and also further improve the toughness. When being used as a bonding agent for preparing the woven friction material, the water-soluble phenolic resin solution has the advantages of low cost and low environmental pollution, can enhance the bonding property of fibers and other materials with slurry so as to prevent the slurry from falling off the material surface, can enhance the high temperature resistance and frictional resistance of the friction material, and effectively avoids reduction of the friction factor due to the thermal decomposition of the resin.

Description

technical field [0001] The invention relates to the technical field of water-soluble phenolic resin, in particular to a water-soluble phenolic resin adhesive for braided friction materials and a preparation method thereof. Background technique [0002] Braided friction materials such as brake pads or clutch faces in automobiles and other mechanical equipment are generally composed of binders, reinforcing fibers, fillers, etc. The preparation process generally adopts a wet process, that is, first bonding resin and rubber The agent is dissolved in an organic solvent, and fillers are added to prepare a slurry, and then the reinforcing fiber is impregnated into the slurry, dried and woven into a blank, and then the blank is hot-pressed, and after high-temperature curing, grinding, drilling and other post-treatments, friction is obtained. Material products. [0003] In the above preparation process, when oil-soluble phenolic resin is used to prepare slurry, a large amount of org...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L61/14C08K3/34C08K3/08C08G8/28C09K3/14
Inventor 黄勇乌学东曹慧军王宗和程慧玲
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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