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Vinyl-containing cage type silsesquioxane modified bismaleimide resin and preparation method thereof

A technology of bismaleimide resin and bismaleimide, applied in the field of vinyl cage silsesquioxane-modified bismaleimide resin and its preparation, can solve the problem of sacrificial bismaleimide Imide resin and other problems to achieve the effect of increasing strength, improving toughness, and avoiding poor dispersion

Inactive Publication Date: 2019-01-11
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Bismaleimide resin is an ideal resin matrix for advanced composite materials and high-performance adhesives due to its excellent comprehensive properties such as high temperature resistance, heat and humidity resistance, radiation resistance, electrical insulation, wave permeability, and good mechanical properties. It is widely used in high-tech fields such as national defense and military industry and high-performance electronic equipment. However, due to the high cross-linking density and strong molecular chain rigidity of the BMI curing system, the resin is extremely brittle, and the poor toughness is why BMI adapts to high-tech requirements. And a major obstacle to expanding new application fields, so how to improve resilience has become one of the key technologies that determine the application and development of BMI
[0003] Conventional toughening modification methods mainly include: internal chain extension modification, diamine modification, allyl compound modification, thermoplastic or thermosetting resin modification, rubber elastomer toughening modification, inorganic functional material modification etc., but these will sacrifice the strength, heat resistance, dielectric properties, etc. of the bismaleimide resin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 40g of N,N'-4,4'-diphenylmethane bismaleimide and 30g of diallyl bisphenol A, mix well, stir and react in an oil bath at 100°C for 20min, add 1g For methacryloxypropyl cage silsesquioxane, heat up to 135°C for 20 minutes under stirring conditions, debubble in a vacuum oven at 140°C for 30 minutes, pour into a preheated glass mold at 140°C, and again Debubble in a vacuum oven at 140°C for 20 minutes, cure according to the process of 150°C / 2h+180°C / 2h+220°C / 4h, and post-treat at 240°C / 4h. After cooling down to room temperature, the mold is released to obtain a high-toughness bismaleimide resin composite material.

[0022] After testing, the impact strength of the prepared bismaleimide resin is 10.49kJ / m 2 , The bending strength is 122.16Mpa.

Embodiment 2

[0024] Weigh 40g of N,N'-4,4'-diphenylmethane bismaleimide and 30g of diallyl bisphenol A, mix well, stir and react in an oil bath at 100°C for 20min, add 3g For methacryloxypropyl cage silsesquioxane, heat up to 135°C for 20 minutes under stirring conditions, debubble in a vacuum oven at 140°C for 30 minutes, pour into a preheated glass mold at 140°C, and again Debubble in a vacuum oven at 140°C for 20 minutes, cure according to the process of 150°C / 2h+180°C / 2h+220°C / 4h, and post-treat at 240°C / 4h. After cooling down to room temperature, the mold is released to obtain a high-toughness bismaleimide resin composite material.

[0025] After testing, the impact strength of the prepared bismaleimide resin is 10.86kJ / m 2 , The bending strength is 130.79Mpa.

Embodiment 3

[0027] Weigh 40g of N,N'-4,4'-diphenylmethane bismaleimide and 30g of diallyl bisphenol A, mix well, stir and react in an oil bath at 100°C for 20min, add 5g For methacryloxypropyl cage silsesquioxane, heat up to 135°C for 20 minutes under stirring conditions, debubble in a vacuum oven at 140°C for 30 minutes, pour into a preheated glass mold at 140°C, and again Debubble in a vacuum oven at 140°C for 20 minutes, cure according to the process of 150°C / 2h+180°C / 2h+220°C / 4h, and post-treat at 240°C / 4h. After cooling down to room temperature, the mold is released to obtain a high-toughness bismaleimide resin composite material.

[0028] After testing, the impact strength of the prepared bismaleimide resin is 19.10kJ / m 2 , The bending strength is 147.62Mpa.

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Abstract

The invention relates to vinyl-containing cage type silsesquioxane modified bismaleimide resin and a preparation method thereof. The vinyl-containing cage type silsesquioxane modified bismaleimide resin comprises 40-100 parts of bismaleimide resin, 30-80 parts of diallyl bisphenol A and 4-10 parts of methacryloxypropyl cage type silsesquioxane in parts by weight, wherein the bismaleimide resin ismodified to substantially improve the toughness of the bismaleimide resin without lowering the strength of the bismaleimide resin. The vinyl-containing cage type silsesquioxane modified bismaleimide resin has the beneficial effects that used vinyl-containing cage type silsesquioxane has high synthesis yield, is added to the resin system to avoid the poor dispersibility of inorganic nanoparticles and the problem of easy agglomeration of inorganic nanoparticles in the resin system, and improves the toughness and strength of the bismaleimide resin.

Description

technical field [0001] The invention belongs to the field of high-performance and functional thermosetting resins, and relates to a vinyl-cage silsesquioxane-modified bismaleimide resin and a preparation method thereof. Background technique [0002] Bismaleimide resin is an ideal resin matrix for advanced composite materials and high-performance adhesives due to its excellent comprehensive properties such as high temperature resistance, heat and humidity resistance, radiation resistance, electrical insulation, wave permeability, and good mechanical properties. It is widely used in high-tech fields such as national defense and military industry and high-performance electronic equipment. However, due to the high cross-linking density and strong molecular chain rigidity of the BMI curing system, the resin is extremely brittle, and the poor toughness is why BMI adapts to high-tech requirements. As well as a major obstacle to the expansion of new application fields, how to improv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/455C08G73/12
CPCC08G73/126C08G77/455
Inventor 马晓燕田丹闫龙张弛梁一鸣
Owner NORTHWESTERN POLYTECHNICAL UNIV
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