Modified bismaleimide resin as well as preparation method and application thereof

A technology of bismaleimide resin and bismaleimide, which is applied in the direction of plastic/resin/wax insulators, organic insulators, adhesives, etc., can solve problems such as poor paving properties, and achieve low curing temperature and excellent mechanical properties Performance, low viscosity effect

Active Publication Date: 2012-05-02
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Comprehensive comparison, although the above method of modifying bismaleimide resin has significantly improved the toughness of bismaleimide resin, but still requires a higher temperature (such as 250 ° C) to achieve complete curing
In addition, the currently commercialized modified bismaleimide resin is solid at room temperature, and the prepared prepreg has no stickiness and poor drape, and the molding process performance of the matrix resin for composite materials needs to be further improved

Method used

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  • Modified bismaleimide resin as well as preparation method and application thereof
  • Modified bismaleimide resin as well as preparation method and application thereof
  • Modified bismaleimide resin as well as preparation method and application thereof

Examples

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preparation example Construction

[0021] The preparation modified bismaleimide resin provided by the present invention can specifically carry out by following two methods:

[0022] 1. Melt copolymerization method:

[0023] (1) The reaction vessel is equipped with a reflux condensing device, a thermometer and heating equipment. Add ethynyl aniline to the reaction vessel, heat to 80-120°C, then add or not add a specified amount of thermoplastic toughening agent according to actual needs, keep stirring until the toughening agent is completely dissolved.

[0024] (2) Keep the temperature of the reaction system between 80 and 120°C, add a specified amount of bismaleimide, react at a constant temperature until the resin system is completely dissolved and uniform, and then keep the temperature for 0 to 4 hours to obtain the final modified bismaleimide imide resin.

[0025] 2. Solution copolymerization method:

[0026] (1) The reaction vessel is equipped with a reflux condensing device, a thermometer and heating eq...

Embodiment 1

[0030] The 500ml three-necked bottle is equipped with a reflux condenser, a thermometer and a mechanical stirrer. First add 80g of 4-ethynylaniline, heat to 90°C, then add 40g of polyarylethersulfone with a number average molecular weight of 25,000, and stir at constant temperature until the reaction system is completely dissolved.

[0031] Raise the temperature of the reaction system to 120°C, add 147g of N,N'-diphenylmethane type bismaleimide, react at a constant temperature until the resin system is completely dissolved and uniform, and then keep the temperature for 60 minutes to obtain the modified bismaleimide provided by the present invention imide resin. The resin is a brown-red viscous liquid at room temperature.

[0032] Characterize the curing behavior of gained modified bismaleimide resin with differential calorimetry scanner (DSC), test atmosphere is N 2 , the heating rate is 10°C / min. figure 1 is the DSC curve of the modified bismaleimide resin. Depend on figur...

Embodiment 2

[0039] The 500ml three-necked bottle is equipped with a reflux condenser, a thermometer and a mechanical stirrer. First add 200g of toluene, then add 20g of 3-ethynylaniline, stir well and heat to toluene reflux temperature. 10 g of polyaryletherketone with a number average molecular weight of 80,000 was added, and the mixture was refluxed until completely dissolved.

[0040] Add 40g of N,N'-diphenyl ether type bismaleimide, reflux reaction until the bismaleimide is completely dissolved, and the resin system is transparent and uniform, then reflux reaction for 6 hours. The solvent in the reaction system was distilled off under reduced pressure, the distillation termination temperature was 90° C., and the vacuum degree was ≥0.096 Mpa to obtain the modified bismaleimide resin provided by the present invention. The resin is a brown-red viscous liquid at room temperature.

[0041] Characterize the curing behavior of gained modified bismaleimide resin with differential calorimetr...

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Abstract

The invention discloses a modified bismaleimide resin as well as a preparation method and an application thereof. The preparation method comprises the steps of carrying out high-temperature melting or solution prepolymerization on ethynylaniline, a thermoplastic toughener and a bismaleimide monomer which are mixed according to a certain ratio to obtain a homogeneous and transparent resin. The novel modified bismaleimide resin not only has the characteristics of good forming process properties such as small resin melting viscosity, good solvent solubility, low curing temperature and the like, but also has excellent resistance to high temperature in the form of cured resin. The resin system not only can be used for the matrix resin of the high temperature resistant composite material, and but also can be used in the fields of high temperature resistant adhesives and insulation materials for electronic / electric appliances.

Description

technical field [0001] The invention relates to the field of bismaleimide resins, in particular to a modified bismaleimide resin and its preparation method and application. Background technique [0002] Bismaleimide (BMI) resin has excellent heat resistance, electrical insulation, wave transparency, radiation resistance, flame retardancy, weather resistance, good mechanical properties and dimensional stability, and its molding process is similar to that of rings. It is widely used in the resin matrix of advanced composite materials, high temperature resistant insulating materials and adhesives in aviation, aerospace, machinery, electronics and other industrial fields. [0003] BMI resin, like many thermosetting resins, has weaknesses such as brittleness after curing, poor impact resistance and stress crack resistance, which limits its popularization and application in certain fields. Therefore, the research on BMI modification has always been a research topic that material ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10C08L79/08C08L81/06C08L71/10C08L81/02C09J179/08H01B3/30
Inventor 刘锋赵彤李晓丽周恒
Owner INST OF CHEM CHINESE ACAD OF SCI
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