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Heat-resistant Friction Material and Its Application

A friction material and heat-resistant technology, applied in other chemical processes, chemical instruments and methods, etc., can solve problems such as limited use conditions, resource waste environment, and reduced service life of friction materials, and achieve good shape memory performance and remodeling Performance, simple synthesis process, outstanding effect of heat resistance

Active Publication Date: 2021-02-09
江苏立一新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Thermal performance is an important performance for friction materials. During the friction process, if the heat resistance is poor, the service life of the friction material will be reduced and the use conditions will be limited.
[0003] Bismaleimide is a thermosetting resin with excellent mechanical properties and heat resistance. It is widely used in aerospace and other fields. At present, there are few reports on wear-resistant materials based on bismaleimide resin. Most of them are used as The modifier (the amount used is less than that of the main resin) is used for the modification of other substances, and the use of a reasonable process to prepare Shuangma wear-resistant materials has good practical significance
[0004] In addition, thermosetting resins are considered to be moldable only once and cannot be reused. Once defects such as cracks appear in wear-resistant products, they can only be scrapped, which will cause serious waste of resources and environmental pollution.
In recent years, the developed remodelable thermoset SMPs cannot combine high heat resistance, high mechanical properties, and good shape memory properties, and cannot be used as wear-resistant materials.

Method used

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  • Heat-resistant Friction Material and Its Application
  • Heat-resistant Friction Material and Its Application
  • Heat-resistant Friction Material and Its Application

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] The preparation method of heat-resistant friction material of the present invention is as follows:

[0035] (1) In the presence of quaternary ammonium salt, react 2-allylphenyl glycidyl ether with terephthalic acid to prepare bis(3-(2-allylphenoxy)-2-hydroxypropyl) terephthalates;

[0036] (2) Stir and mix bis(3-(2-allylphenoxy)-2-hydroxypropyl) terephthalate, bismaleimide, zinc compound and filler system to obtain heat-resistant Friction material system; filler system includes epoxy resin and alumina;

[0037] (3) The heat-resistant friction material system is subjected to hot-press curing and post-treatment to obtain the heat-resistant friction material.

Synthetic example

[0039] On a mass basis, mix 120g of 2-allylphenol, 140g of sodium hydroxide, 10g of tetrabutylammonium bromide and 230g of tetrahydrofuran, and insulate and react at 35°C for 1.5h under stirring conditions to obtain solution A; Slowly add 270 g of epichlorohydrin dropwise, and keep stirring at 35° C. for 6 hours to react; after the reaction, vacuum rotary evaporation removes tetrahydrofuran and epichlorohydrin to obtain a crude product. The crude product was washed successively with saturated ammonium chloride solution (200 mL×2), deionized water (200 mL×2), and finally separated and purified by chromatography to obtain a yellow transparent liquid, namely 2-allylphenyl Glyceryl ether, the yield is about 93%, its reaction formula and 1 H-NMR see attached figure 1 and 2 . On a mass basis, mix 120g 2-allylphenyl glycidyl ether, 45g terephthalic acid, 10g tetrabutylammonium bromide and 230g acetonitrile, and keep it under stirring for 8 hours at 70°C; after the reaction, The a...

Embodiment 1

[0041] Example 1 Preparation of heat-resistant friction material

[0042]50g N, N'-4,4'-diphenylmethane bismaleimide, 76.17g bis(3-(2-allylphenoxy)-2-hydroxypropyl)terephthalate Mix with 6.29g (22.3mmol) zinc acetylacetonate hydrate and 3.5g filler system, stir and pre-polymerize at 130°C for 60 minutes to obtain a prepolymer, take a sample for DSC test; cool the clear prepolymer to room temperature and add 150°C prepolymer In the heated mold, press and post-process according to the following process: 150 ℃ / 1 h / 1MPa+180 ℃ / 2 h / 3MPa+200 ℃ / 1.5 h / 5MPa+220 ℃ / 1.5 h / 5MPa and 240 ℃ / 2 h; demould after natural cooling to obtain a heat-resistant friction material, and test TG, DMA, bending strength and wear resistance.

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Abstract

The invention discloses a heat-resistant friction material and an application thereof. The material is prepared specifically by the following steps: mixing 2-allyl phenyl glycidyl ether and terephthalic acid in acetonitrile, and performing an esterification reaction under the condition of using a quaternary ammonium salt as a catalyst to obtain a bis(3-(2-allylphenoxy)-2-hydroxypropyl)terephthalate containing a reversible dynamic group; and uniformly mixing the bis(3-(2-allylphenoxy)-2-hydroxypropyl)terephthalate, bismaleimide and aluminum oxide, and performing curing to obtain the heat-resistant friction material. The heat-resistant friction material prepared by the method has good abrasion resistance, heat resistance and mechanical properties, can realize remolding under the condition ofhot pressing, and has broad application prospects.

Description

technical field [0001] The invention relates to a heat-resistant friction material and its preparation and remodeling methods, belonging to the field of thermosetting shape memory polymers and recyclable polymers. Background technique [0002] Thermal performance is an important performance for friction materials. During the friction process, if the heat resistance is poor, the service life of the friction material will be reduced and the use conditions will be limited. [0003] Bismaleimide is a thermosetting resin with excellent mechanical properties and heat resistance. It is widely used in aerospace and other fields. At present, there are few reports on wear-resistant materials based on bismaleimide resin. Most of them are used as The modifier (used less than the main resin) is used to modify other substances, and it has good practical significance to prepare Shuangma wear-resistant materials with a reasonable process. [0004] In addition, thermosetting resins can only...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/14C08L79/08C08L63/00C08K3/22C08G73/12
CPCC08G73/127C08K2003/2227C08K2201/003C08L79/085C08L2201/08C08L2201/12C09K3/14C08L63/00C08K3/22
Inventor 梁国正韩建王志龙
Owner 江苏立一新材料科技有限公司