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Bimaleimide foam material and preparation thereof

A technology of bismaleimide and foaming material, which is applied in the field of preparation of polymer foam materials, can solve problems such as poor dielectric properties of foam materials, achieve good mechanical properties and molding processability, convenient material sources, The effect of simple molding process

Inactive Publication Date: 2009-01-14
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The foam material obtained according to the above technical scheme has good thermal properties, flame retardancy, mechanical properties, etc., but, due to the addition of more fillers and auxiliary agents in the foaming process, the dielectric properties of the obtained foam material are not good. good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] By weight, 100 parts of N,N'-4,4'-diphenylmethane bismaleimide and 43 parts of 0,0'-diallyl bisphenol A were blended at a temperature of 130°C After the mixture is transparent, keep it warm for 30 minutes to obtain a bismaleimide / diallyl bisphenol A prepolymer.

[0016] When the temperature of the prepolymer drops below 50°C, add 10 parts of azodicarbonamide and mix evenly to obtain a prefoam.

[0017] Put the pre-foam into a mold at 140°C, foam at 140°C for 35 minutes, and then perform curing treatment according to the process of 140°C / 2h+160°C / 2h+180°C / 2h+200°C / 2h, and then After treatment at 240°C / 4h, a high-performance bismaleimide foam material can be obtained. It is measured that its dielectric constant is 1.57 at a frequency of 1 MHz, and its dielectric loss value is 0.0025.

Embodiment 2

[0019] By weight, blend 100 parts of N,N'-4,4'-diphenylmethane bismaleimide and 67 parts of 0,0'-diallyl bisphenol A at 130°C until the mixture is transparent After keeping it warm for 30 minutes, a bismaleimide / diallyl bisphenol A prepolymer was obtained. When the temperature of the prepolymer drops below 50°C, add 15.3 parts of azodicarbonamide and mix evenly to obtain a prefoam. Put the pre-foam into a mold at 160°C, and after foaming at 160°C for 30 minutes, perform curing and post-treatment according to the processes of 160°C / 2h+180°C / 2h+200°C / 2h and 240°C / 4h respectively. That is, a high-performance bismaleimide foam material is obtained. Its dielectric constant and dielectric loss value measured at 1MHz frequency are 1.54 and 0.0009, respectively.

Embodiment 3

[0021] By weight, blend 100 parts of N,N'-4,4'-diphenylmethane bismaleimide and 80 parts of 0,0'-diallyl bisphenol A at 140°C until the mixture is transparent Then keep it warm for 40 minutes to obtain bismaleimide / diallyl bisphenol A prepolymer. When the temperature of the prepolymer drops below 50°C, add 16.2 parts of azodicarbonamide and mix evenly to obtain a prefoam. Put the pre-foam into a mold at 160°C, and after foaming at 160°C for 20 minutes, perform curing and post-treatment according to the processes of 160°C / 2h+180°C / 2h+200°C / 2h and 220°C / 10h respectively. That is, a high-performance bismaleimide foam material is obtained. Its dielectric constant and dielectric loss values ​​at 1MHz frequency are 1.75 and 0.0050, respectively.

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Abstract

The invention discloses bismaleimide foaming material and the preparation method. The bismaleimide foaming material is composed of 100 parts of N, N`-4, 4`-diphenylmethane bismaleimide / O, O`-diallyl bisphenol A performed polymer and 3 to 12 parts of foaming agent. The preparing method adopts 100 parts of bismaleimide and 43 parts to 103 parts of diallyl bisphenol A resin to be mixed at the temperature of 120 DEG C to 150 DEG C to obtain the performed polymer, 3 to 12 parts of foaming agent are added into the performed polymer per 100 parts of the performed polymer and are evenly mixed, the mixture is positioned into a preheating die, is foamed at 140 DEG C to 180 DEG C for 35 to 10 min, is solidified at the temperature of 140 to 200 DEG C for 4 hours to 8 hours and then is processed at the temperature of 220 DEG C to 240 DEG C for 4 hours to 10 hours, to obtain the bismaleimide foaming material with high performance. The bismaleimide foaming material can be applied to occasions where the requirements for lightness, heat resistance and dielectric properties and mechanical properties of the material are high and also can be served as core material for forming composite material with high performance.

Description

technical field [0001] The invention relates to a high-performance bismaleimide foam material and a preparation method thereof, belonging to the field of preparation of polymer foam materials. Background technique [0002] Foam materials are a class of lightweight materials that have good vibration damping and energy absorption capabilities and therefore play an important role in many fields as effective protective materials. With the progress of society, there is an increasing demand for high-performance structural / functional foam materials in cutting-edge technology fields such as aviation, aerospace, and electronics, especially those with outstanding high temperature resistance, dielectric properties, flame retardancy, good mechanical properties and High-performance foam with good formability. [0003] At present, the more commonly used foam plastics include phenolic formaldehyde, urea formaldehyde, rigid polyvinyl chloride, polyurethane, polystyrene, polycarbonate, etc....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08J9/06B29C44/00B29K77/00
Inventor 顾嫒娟梁国正谢小琴袁莉
Owner SUZHOU UNIV
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