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Application of 3D printing in cross-linked polyimide, preparation of porous polyimide, preparation of polyimide composites

A 3D printing, polyimide technology, applied in applications, additive processing, household appliances, etc., can solve the problem of high heat-resistant cross-linked polyimide 3D printing and less research, thermosetting polyimide It can solve the problems of reduced thermal properties of parts, difficult-to-melt and high-temperature-resistant cross-linked polyimide, etc., to achieve the effect of abundant pores, excellent dimensional stability, and enhanced van der Waals force.

Active Publication Date: 2022-08-09
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since both fused deposition 3D printing and selective laser burning 3D printing are difficult to melt high-temperature-resistant cross-linked polyimide, forming is difficult; although stereolithography 3D printing and digital lithography 3D printing are easier to achieve thermosetting polyimide Forming of imide parts, but the thermal performance of the obtained thermosetting polyimide parts is often reduced; at present, the main research object of direct writing 3D printing polyimide is thermoplastic polyimide, which is made of polyamic acid or polyimide Amic acid salts are used as raw materials, and the printed parts are reheated and imidized to obtain polyimide parts
It can be seen that the existing 3D printing has little research on the 3D printing of high heat-resistant cross-linked polyimide

Method used

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  • Application of 3D printing in cross-linked polyimide, preparation of porous polyimide, preparation of polyimide composites
  • Application of 3D printing in cross-linked polyimide, preparation of porous polyimide, preparation of polyimide composites
  • Application of 3D printing in cross-linked polyimide, preparation of porous polyimide, preparation of polyimide composites

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preparation example Construction

[0036] The invention provides a method for preparing a direct-writing 3D printing cross-linked porous polyimide, comprising the following steps:

[0037] Mixing polyamic acid, organic solvent and porogen to obtain polyamic acid ink;

[0038] performing direct writing 3D printing on the polyamic acid ink to obtain a 3D printed component;

[0039] The 3D printed component is heat-treated to obtain a cross-linked porous polyimide.

[0040] In the present invention, unless otherwise specified, the required preparation raw materials are all commercially available products well known to those skilled in the art.

[0041] In the present invention, the polyamic acid, the organic solvent and the porogen are mixed to obtain the polyamic acid ink. In the present invention, the number average molecular weight of the polyamic acid corresponding to the polyimide is preferably 5000-50000 g / mol, more preferably 10000-30000 g / mol; the polyamic acid is preferably:

[0042]

[0043] The pres...

Embodiment 1

[0078] (1) Preparation of polyamic acid powder: under nitrogen atmosphere, 4.9199g of 4,4'-diaminodiphenyl ether was dissolved in 70mL of N,N-dimethylformamide, and 10.4707g was added in three batches under ice bath conditions. g 4,4'-(hexafluoroisopropene)diphthalic anhydride, remove the ice bath after 1 hour of reaction, after 5 hours of reaction at room temperature, add 0.4965g of 4-phenylethynyl phthalic anhydride and add 20 mL of N,N-dimethylformamide , continue to react for 24h to obtain a polyamic acid solution with a solid content of 15%, pour the polyamic acid solution into a mixed solution of water and ethanol (volume ratio is 4:1) under excessive stirring conditions, and then put the obtained white The solid was soaked in the above mixed solution of water and ethanol for 12h, filtered and washed with water, dried at 80°C for 12h, the obtained solid was pulverized by a pulverizer, and sieved with a 100-mesh sieve to obtain polyamic acid powder, corresponding to the nu...

Embodiment 2

[0084] 6 parts of the polyamic acid powder prepared in Example 1, 4 parts of N,N-dimethylformamide and 15 parts of sodium chloride with a particle size of less than 300 meshes were ball-milled at room temperature, and the ball-milling time was 30min and the ball-milling rate was 3000r / min, the obtained mixture is pumped and centrifuged to remove air bubbles to obtain polyamic acid ink;

[0085] Direct writing 3D printing and heat treatment were carried out by the same method as in Example 1. After immersion in deionized water for 12 h, the obtained part was taken out, washed with deionized water, and dried to obtain a cross-linked porous polyimide.

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Abstract

The invention provides the application of 3D printing in cross-linked polyimide, the preparation of porous polyimide, and the preparation of polyimide composite material, and belongs to the technical field of 3D printing and intelligent manufacturing. The invention uses the direct writing 3D printing technology for the cross-linked polyimide, and can simply prepare the cross-linked porous polyimide with good heat resistance, excellent dimensional stability, abundant pores and controllable pore size; It is used to prepare polyimide composite materials. The prepared polyimide composite materials have the characteristics of excellent thermal performance, good dimensional stability and complex shape, and the process is simple, and can manufacture polyimide with diversified shapes. composite material.

Description

technical field [0001] The invention relates to the technical field of 3D printing and intelligent manufacturing, in particular to the application of 3D printing in cross-linked polyimide, the preparation of porous polyimide, and the preparation of polyimide composite material. Background technique [0002] Polyimide refers to a class of polymers containing an imide structure on the main chain, which has excellent mechanical properties, high and low temperature resistance, good transparency, excellent electrical properties and radiation resistance, etc., so it is widely used in aerospace. , microelectronics, coatings, batteries, automobile manufacturing, liquid crystal display and gas separation and other fields have a wide range of applications. When the polyamic acid solution is prepared according to the number of non-equimolar components, the polyamic acid with controllable molecular weight can be obtained by adding a monoanhydride or monoamine containing a curing crossli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10C09D11/102C09D11/03B33Y70/10
CPCC08G73/1071C08G73/1039C08G73/1007C09D11/102C09D11/03B33Y70/10
Inventor 王晓龙胡海媛丁镜红郭玉雄杨昌宫琛亮周峰
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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