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Thermoplastic polyimide microporous material and its preparation process

A technology of polyimide and microporous materials, applied in the field of preparation of microporous polymer materials, can solve the problems of poor comprehensive performance and complex process of microporous materials, and achieve good bonding effect

Active Publication Date: 2006-07-26
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention: In order to overcome the disadvantages of poor comprehensive performance and complex process of microporous materials, a method of wet mixing with adding solid foaming agent and cold pressing sintering is proposed to prepare thermoplastic polyimide microporous materials

Method used

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  • Thermoplastic polyimide microporous material and its preparation process
  • Thermoplastic polyimide microporous material and its preparation process
  • Thermoplastic polyimide microporous material and its preparation process

Examples

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Effect test

Embodiment 1

[0031] A kind of preparation method of thermoplastic polyimide microporous material, comprises the following processing steps: in 95g thermoplastic polyimide powder (Changzhou Guangcheng New Plastic Co., Ltd., GCPI TM Add polyethylene glycol (purity 99.5%, average molecular weight 20000) 5g in -M1 polyimide molding powder), the two adopt wet mixing, dry, the mixture is packed into the mould, after cold pressing with the pressure of 20MPa, Release the mold, and keep the pressed tablet at 160°C for 1 hour, and at 290°C for 4 hours. The porosity of the prepared microporous material is 16.4%, the bending performance is 40.9MPa, the friction coefficient is 0.06-0.07, and the volume wear rate is 6.61×10 -15 m 3 / (N·m). Its structure is as figure 1 shown.

Embodiment 2

[0033] A kind of preparation method of thermoplastic polyimide microporous material, comprises the following processing steps: in 90g thermoplastic polyimide powder (Changzhou Guangcheng New Plastic Co., Ltd., GCPI TM -M1 polyimide molding powder) was added citric acid (purity 99.5%) 10g, the two were mixed by wet method, dried, the mixture was put into the mold, after cold pressing with a pressure of 30MPa, demoulding, the tablet Incubate at 110°C for 1 hour and at 300°C for 2 hours. The porosity of the prepared microporous material is 21.3%, the bending performance is 42.3MPa, the friction coefficient is 0.06-0.065, and the volume wear rate is 4.85×10 -15 m 3 / (N·m).

Embodiment 3

[0035] A kind of preparation method of thermoplastic polyimide microporous material, comprises the following processing steps: in 80g thermoplastic polyimide powder (Changzhou Guangcheng New Plastic Co., Ltd., GCPI TM -M1 polyimide molding powder) was added 20g of methyl cellulose (purity 99.5%), the two were mixed by wet method, dried, the mixture was put into the mold, and after cold pressing with a pressure of 40MPa, demoulding , keep the pressed tablet at 180°C for 1 hour, and at 310°C for 1 hour. The porosity of the prepared microporous material is 16.4%, the bending performance is 35.6MPa, the friction coefficient is 0.07-0.08, and the volume wear rate is 2.81×10 -15 m 3 / (N·m).

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Abstract

This invention is related to the manufacturing technologic field of a micropore polymeric material, esecilly related to a thermoplastic polyimide micropore material and its preparation technology. Its raw materials and their percentage contents are as belows: thermoplastic polyimid(TPI): 70%-95%; pore former: 5%-30%. The micropore material is prepared by sintering humid mixed powder of polyimide and solid pore former. Its technological process is simple and it costs little. Multi-stage thermostatic sintering makes the mixed powder decompose completely and blend well with the polyimide particles. This improves material's strength and the factor of porosity. Micropore material's property can be adjusted by controlling the contend of the pore former, so it is very easy to adjust the bore diameter and the factor of porosity.

Description

technical field [0001] The invention relates to the technical field of preparation of microporous polymer materials. In particular, it relates to a thermoplastic polyimide microporous material and a preparation process thereof. Background technique [0002] Since the preparation of nylon microporous materials by the Massachusetts Institute of Technology in 1959, microporous materials have developed rapidly, and their interior has a special microporous structure. Among them, microporous polyimide materials are mostly used in aerospace, heat preservation, heat insulation, precision machinery and other fields due to their thermal stability, good mechanical properties, anti-friction and wear resistance and other properties. Foreign countries began to develop microporous polyimide materials in the 1970s. Microporous materials developed rapidly in the 1980s, and the United States successfully applied the materials to high-tech systems such as satellites and aircraft inertial nav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08J9/00
Inventor 黄培王晓东谷和平
Owner NANJING UNIV OF TECH
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