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Production method of high-temperature-resistant workable polyimide plastic alloy

A polyimide and plastic alloy technology, applied in the production field of polyimide plastic alloy, can solve the problems of high molding temperature, high price, low molding yield, etc., and achieve good high temperature resistance, low cost, high heat The effect of high deformation temperature

Inactive Publication Date: 2011-09-28
SHANGHAI TONGMING MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As an engineering plastic, its processing method is similar to the powder metallurgy method. It is molded under high temperature and high pressure. The molding temperature is as high as 450°C, and the molding yield is low and the price is expensive.

Method used

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  • Production method of high-temperature-resistant workable polyimide plastic alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Introduce nitrogen into a 300-liter stirred reactor, add 104.4kg dimethylacetamide, add 6kg 4.4'-diphenyl ether diamine under stirring, dissolve it at room temperature, and then add pyromellitic acid di Anhydride 6.66kg, the reaction temperature is controlled to be lower than 30°C, the viscosity of the reaction system increases gradually, and the viscosity is measured by sampling.

[0025] When the intrinsic viscosity of the resin reaches above 1.5, it can be diluted with a polar solvent, add 50kg of dimethylacetamide, stir evenly, add 26.88kg of polyethersulfone to dissolve it, dissolve it completely and stir evenly, and make the viscous The slurry was precipitated in coagulant ethanol, filtered, washed, and the filter cake was dried. The dried filter cake was pulverized into a powder, heat-treated at 300° C. for 3 hours, and cooled to obtain 38 kg of powder.

[0026] The powder was subjected to compression molding: the molding temperature was 360°C, the pressure was 1...

Embodiment 2

[0028] This example is operated in the same manner as Example 1, except that the amount of polyethersulfone resin added is changed to 11.52kg, and a total of 23kg of powder is obtained as the final product. The powder was subjected to compression molding: the molding temperature was 380°C, the pressure was 100MPa, the heat preservation and pressure were maintained for 60 minutes, cooled, and the plate was taken out. The measured properties are shown in Table 1.

[0029] Table 1

[0030]

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Abstract

The invention relates to a production method of a high-temperature-resistant workable polyimide plastic alloy. The production method comprises the following steps: reacting aromatic diamine with aromatic dianhydride in a polar solvent in an equimolar ratio so as to generate polyamide acid; diluting the polyamide acid with the polar solvent; adding polyarylsulfone resin the mass of which is 20-80% of total mass of the system for evenly dissolution; precipitating the solution in a coagulator, and smashing precipitate to powder; carrying out drying, thermal treatment and compression molding on the powder so as to prepare the polyimide plastic alloy. In the method, the polar solvent is one or a mixed solvent of multiple dimethylformamide, dimethylacetylamide, N-methylpyrrolidone, hexamethylphosphoramide, sulfolane and m-cresol; and the coagulator is alcohol, ketone or water. The polyimide plastic alloy prepared by using the production method has the advantages of high deformation temperature, good high temperature resistance and low cost, is workable, and can be used for a long term at the high temperature.

Description

technical field [0001] The invention relates to a manufacturing process of a polymer material, in particular to a production method of a high-temperature-resistant and easy-to-process polyimide plastic alloy. Background technique [0002] Aromatic polyimide has excellent heat resistance, can be used for a long time at 260-300 °C, and has a heat distortion temperature above 360 ​​°C. It has excellent mechanical properties, dielectric properties, radiation resistance, and resistance at high and low temperatures. Flammability and wear resistance etc. It is widely used as high-temperature insulating material, high-temperature wear-resistant material, high-temperature sealing material, high-temperature mechanical parts, etc. in the aircraft industry, precision machinery industry, automobile industry, electromechanical industry, and electronic industry. As an engineering plastic, its processing method is similar to the powder metallurgy method. It is molded under high temperature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08L81/06C08G73/10
Inventor 范同波马明兴
Owner SHANGHAI TONGMING MATERIAL TECH
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