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Method for preparing thermoplastic polyimide porous material

A technology of polyimide and porous material, applied in the field of polyimide, can solve the problems of difficult mass production, complex process and high cost, and achieve the effects of low cost, simplified process and improved material strength

Inactive Publication Date: 2009-06-17
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, from the existing literature, no matter which method is used to prepare polyimide porous materials, the process is complicated, low in efficiency, high in cost, and difficult for large-scale production.

Method used

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  • Method for preparing thermoplastic polyimide porous material
  • Method for preparing thermoplastic polyimide porous material
  • Method for preparing thermoplastic polyimide porous material

Examples

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Embodiment 1

[0024] A preparation method for a thermoplastic polyimide porous material, comprising the following processing steps: adding porogen NaCl 30g in 10g thermoplastic polyimide powder (produced by China Changzhou Guangcheng New Plastic Co., Ltd., the same afterward), both Dry mixing is adopted, the mixture is put into a mold, and after being cold-pressed at a pressure of 20MPa, the mold is opened for degassing, and then kept at a pressure of 50MPa and 330°C for 30 minutes, cooled and demoulded, and leached in hot water at a temperature of 60°C Porogen, made polyimide porous material. The obtained microporous material (i.e. polyimide porous material, the same hereinafter) has a porosity of 66.9%, and a density of 0.45gcm -3 , compressive strength (σ 0.1 ) is 4.65MPa, its structure is as figure 1 shown.

Embodiment 2

[0026] A kind of preparation method of thermoplastic polyimide porous material comprises the following processing steps: in 5g thermoplastic polyimide powder (production of Changzhou Guangcheng New Plastic Co., Ltd.), add porogen sodium sulfate Na 2 SO 4 30g, the two are mixed by dry method, the mixture is put into the mold, and after being cold-pressed at a pressure of 30MPa, the mold is opened for degassing, and then kept at a pressure of 50MPa and 330°C for 30 minutes, cooled and demoulded, and the temperature is 50°C The porogen is leached out in hot water to obtain a polyimide porous material. The prepared microporous material has a porosity of 79.35% and a density of 0.278gcm -3 , compressive strength (σ 0.1 ) is 1.98MPa, its structure is as figure 2 shown.

Embodiment 3

[0028] A preparation method of a thermoplastic polyimide porous material, comprising the following process steps: adding 30 g of porogen NaCl to 3 g of thermoplastic polyimide powder (produced by Changzhou Guangcheng New Plastic Co., Ltd.), and mixing the two by dry method , put the mixture into the mold, after cold pressing at a pressure of 30MPa, open the mold for degassing, then keep the temperature at 330°C for 30 minutes at a pressure of 50MPa, cool and demould, and leaching in hot water at a temperature of 60°C to cause pores agent to prepare polyimide porous material. The prepared microporous material has a density of 0.19 gcm -3 , the porosity is 85.8%, the compressive strength (σ 0.1 ) is 0.85MPa, its structure is as image 3 shown.

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Abstract

The invention discloses a preparation method for thermoplastic polyimide porous materials, which is characterized by comprising following steps: a pore-foaming agent and thermoplastic polyimide materials are taken according to weight percentage of 20 percent to 95 percent of pore-foaming agent and 5 percent to 80 percent of thermoplastic polyimide and compound powder is prepared after even mixing; the compound powder is installed in a module and the module is then put into a constant temperature heating device; under pressure of 20 to 50 Mpa and temperature of 280 to 330 DEG C, heat preservation and pressure maintaining are carried on for 20 to 40 minutes, then natural cooling and demoulding are carried on, and then molded matter is prepared; the molded matter is soaked into water to soak the pore-foaming agent out, then polyimide porous materials are obtained. By using the invention which has simple technical procedure, fast molding, and low cost, the prepared thermoplastic polyimide porous materials has the advantages of fine thermal stability, strong force intensity, and being extensively applied to the fields of Aero-Space, heat preservation, thermal insulation, fine mechanics, etc.

Description

technical field [0001] The invention relates to polyimide, in particular to a method for preparing a thermoplastic polyimide porous material. The prepared porous material products are widely used in aerospace, heat preservation, heat insulation, precision machinery and other fields. 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. The United States successfully applied this material to high-tech s...

Claims

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Application Information

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IPC IPC(8): C08J9/26C08L79/08B29C43/52
Inventor 邓建国贺传兰罗世凯孙素明朱敬芝王宪忠
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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