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Prepolymer for high performance friction materials and application of prepolymer

A friction material and prepolymer technology, applied in the field of thermosetting shape memory polymers and recyclable polymers, to achieve the effects of good shape memory performance and remodeling performance, low energy consumption, and simple synthesis process

Active Publication Date: 2020-01-14
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

[0003] In addition, bismaleimide is a thermosetting resin with excellent mechanical properties and heat resistance, and is widely used in aerospace and other fields. Currently, there are few reports on bismaleimide resin-based wear-resistant materials It is used as a modifier (less than the main resin) for the modification of other substances, and it has good practical significance to prepare Shuangma wear-resistant materials with a reasonable process

Method used

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  • Prepolymer for high performance friction materials and application of prepolymer
  • Prepolymer for high performance friction materials and application of prepolymer
  • Prepolymer for high performance friction materials and application of prepolymer

Examples

Experimental program
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Effect test

preparation example Construction

[0027] The preparation method of the high-performance friction material prepolymer of the present invention is as follows:

[0028] (1) In the presence of quaternary ammonium salt, 2-allylphenyl glycidyl ether is reacted with terephthalic acid to prepare bis(3-(2-allylphenoxy)-2-hydroxypropyl) terephthalates;

[0029] (2) Stir and mix bis(3-(2-allylphenoxy)-2-hydroxypropyl) terephthalate, bismaleimide, zinc compound, and filler system to obtain high performance Prepolymers for friction materials; filler systems include epoxy resin, aluminum phosphate and aluminum oxide.

[0030] The high-performance friction material prepolymer is subjected to hot-press curing and post-treatment to obtain a high-performance friction material.

Synthetic example

[0032] By mass, 120g of 2-allylphenol, 140g of sodium hydroxide, 10g of tetrabutylammonium bromide and 230g of tetrahydrofuran were mixed, and the reaction was kept at 35°C and stirred for 1.5h to obtain solution A; Slowly add 270 g of epichlorohydrin dropwise, and keep stirring at 35°C for 6 h; after the reaction, vacuum rotary evaporation to remove 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 a chromatographic column to obtain a yellow transparent liquid, which is 2-allylphenyl acetonitrile Glyceryl ether, the yield is about 93%, and its reaction formula and 1 H-NMR see attached figure 1 and 2 . By mass, 120g of 2-allylphenyl glycidyl ether, 45g of terephthalic acid, 10g of tetrabutylammonium bromide and 230g of acetonitrile were mixed, and the reaction was kept at 70°C under stirring conditions...

Embodiment 1

[0034] Example 1 Preparation of prepolymer for high performance friction material

[0035] 50g N, N'-4,4'-diphenylmethane bismaleimide, 76.17g bis(3-(2-allylphenoxy)-2-hydroxypropyl) terephthalate It was mixed with 6.29g (22.3mmol) of zinc acetylacetonate hydrate and 5.5g of filler system, and prepolymerized under stirring for 90min at 130°C to obtain a prepolymer for high-performance friction materials, which was sampled and tested for DSC.

[0036] The above-mentioned high-performance friction material prepolymer was cooled to room temperature and then added to the mold preheated at 150 °C, and hot pressed and post-treated according to the following process: 150 °C / 1 h / 1MPa+180 °C / 2 h / 3MPa+ 200 ℃ / 1.5 h / 5MPa + 220 ℃ / 1.5 h / 5MPa and 240 ℃ / 2 h; after natural cooling, demoulding was performed to obtain high-performance friction materials, and TG, DMA, oxygen index and wear resistance were tested.

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Abstract

The invention discloses a prepolymer for high performance friction materials and application of the prepolymer. The prepolymer is specifically prepared through the steps that 2-allyl phenylglycidyl ether and terephthalic acid are mixed in acetonitrile and esterified under the condition that a quaternary ammonium salt is used as a catalyst to obtain bis(3-(2-allyl phenoxy)-2-hydroxypropyl)terephthalate containing a reversible dynamic group; and then the bis(3-(2-allyl phenoxy)-2-hydroxypropyl)terephthalate is evenly mixed with bismaleimide, aluminum phosphate and alumina to obtain the prepolymer, and the high performance friction materials are obtained by curing. The high performance friction materials prepared by the prepolymer have good wear resistance, heat resistance and flame resistance, can realize remodeling under hot pressing conditions, and have broad application prospects.

Description

technical field [0001] The invention relates to a prepolymer for high-performance friction materials, belonging to the field of thermosetting shape memory polymers and recyclable polymers. Background technique [0002] In recent years, the developed remodelable thermoset SMPs cannot combine high heat resistance, flame retardancy and good shape memory properties, and cannot be used as wear-resistant materials. Thermosetting resins are considered to be formed only once and cannot be reused. Once the wear-resistant products have defects such as cracks, they can only be scrapped, which will cause serious waste of resources and environmental pollution. Oxygen Index (OI) refers to the minimum oxygen concentration required for a material to burn with flame in an oxygen-nitrogen mixture under specified conditions. It is expressed by the volume percentage of oxygen; high oxygen index means that the material is not easy to burn, low oxygen index means that the material is easy to bur...

Claims

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Application Information

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IPC IPC(8): C08L79/08C08L63/00C08K3/32C08K3/22C07C67/26C07C69/82C07D301/28C07D303/23
CPCC08L79/08C07C67/26C07D301/28C07D303/23C08K2003/327C08K2003/2227C08L2201/12C08L63/00C08K3/32C08K3/22C07C69/82
Inventor 梁国正韩建王志龙
Owner 江苏立一新材料科技有限公司
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