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Preparation method of low-density polyimide soft foam

A polyimide and low-density technology, applied in the field of preparation of low-density polyimide soft foam, can solve the problems of low compression and tensile strength of polyimide foam, achieve no degradation in performance, and speed up reaction quality , the effect of speeding up the reaction

Active Publication Date: 2012-07-25
LIYANG HUAJING ELECTRONICS MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The compression and tensile strength of the polyimide foam prepared by this method are not high, the glass transition temperature changes with the change of the monomer, generally around 300 °C, and the density range is 0.032g / cm 3 ~0.08g / cm 3 scope

Method used

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  • Preparation method of low-density polyimide soft foam

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0037] low density foaming powder

[0038] Spread 150g of A powder on a 30×30×12cm tray, put it into a microwave oven, 600W power, 180°C foaming, the foaming ratio is about 35 times within 20 minutes, and the density is controlled at 6.5KG / M 3 , increase the power to 2000W, turn on the dual-bond polymerization aging after 15 minutes, and age in an oven at 320°C for 5 hours to obtain a low-density product foam.

example 2

[0040] Foaming with higher density foaming powder

[0041] Add 30 grams of powder B and 120 grams of powder A to obtain 150 g of mixed powder, spread them all on a tray of 30×30×12 cm, put them in a microwave oven, 600W power, foam at about 180°C, and foam after 20 minutes The magnification is about 28 times, the power is increased to 2000W, the preliminary polymerization aging is carried out for 20 minutes, and the aging is carried out in an oven at 320°C for 5 hours to obtain a foam with a higher foaming density.

example 3

[0043] Foaming with higher density foaming powder

[0044] The amount of powder B added is 60 grams, and the amount of powder A added is 90 grams to obtain 150 g of mixed powder. Spread them on a tray of 30×30×12 cm, put them in a microwave oven, 600W power, foam at about 180°C, and the foaming ratio after 20 minutes About 18 times, increase the power to 2000W, conduct preliminary polymerization aging for 20 minutes, and age in an oven at 320°C for 5 hours to obtain foam with higher foaming density.

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Abstract

The invention provides a preparation method of low-density polyimide soft foam, comprising the following steps of: (A) preparing A powder: mixing binary anhydride D1, de-ionized water and C1-C2 alkyl monohydric alcohol to react to be transparent at a temperature of 60-90 DEG C; reducing the temperature to 25-55 DEG C and adding diamine or diisocyanate DA1 which has the equal mol amount of the binary anhydride; reacting at the state that the temperature is less than or equal to 40 DEG C for 30-120 min and cooling to a room temperature; continually agitating for 120 min to obtain a liquid resinprecursor polyamide-ester with the solid content of 55-65% and viscosity of less than 10000 cp; drying in vacuum and crushing to obtain the A powder; (2) preparing B powder: mixing binary anhydride D2 with diamine DA2 to synthesize polyamic acid resin with the viscosity of 800-1500 p and the solid content of 15-40%; drying, carrying out ring closing, and ageing to obtain the B powder with Tg morethan 300 DEG C; (3) foaming, fully mixing the A powder and the B powder, foaming, carrying out ring closing and aging to obtain the multipurpose polyimide soft foam, wherein the mass percentage of the B powder in the A powder and the B powder is x and x is more than 0 and less than or equal to 40%.

Description

technical field [0001] The invention relates to a preparation method of low-density polyimide soft foam. Background technique [0002] After nearly 50 years of rapid development at home and abroad, the demand for high-performance polyimide foam is increasing, and the domestic demand for polyimide foam is also growing rapidly. The biggest task at present is to further achieve high performance and low cost. [0003] There are many kinds of thermosetting and thermoplastic polyimides. According to incomplete statistics, there are 200 to 300 kinds of dianhydride and diamine monomers that can be used to synthesize polyimides. There are many methods for synthesizing polyimides, which can be used according to different applications. The purpose is to choose different monomers and different synthesis methods, so there are thousands of polyimide materials that have been synthesized or studied. The diversity of synthesis methods of this material is not available in other polymer mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C08L79/08
Inventor 钱时昌
Owner LIYANG HUAJING ELECTRONICS MATERIAL
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