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Polyimide composition and preparation method thereof

A technology of polyimide and composition, which is applied in the field of additively manufactured polyimide composition and its preparation, and can solve problems such as difficulty in forming dense sintered parts, low mechanical properties of sintered parts, and difficult processing

Pending Publication Date: 2022-05-13
CHANGSHA ADVANCED MATERIALS IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although standard PI has been widely used in industry, its current application in some high-tech fields, such as 3D printing, has been greatly restricted due to its special molecular structure, mainly due to the difficulty in processing.
Amorphous polyimide materials do not have crystallinity. They cannot melt rapidly in a narrow temperature range during laser sintering, and their apparent viscosity is high, making it difficult to form dense sintered parts. Higher porosity will The mechanical properties of the sintered parts are much lower than the bulk mechanical properties of the material

Method used

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  • Polyimide composition and preparation method thereof
  • Polyimide composition and preparation method thereof

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Embodiment 1

[0029] (1) 92 parts of crystallinity polyimide and 1 part of polycarbonate resin were pulverized together using an ultrafine pulverizer, and sieved in a mechanical vibrating sieve to obtain a mixed powder.

[0030] (2) adding the mixed powder prepared in step (1), 5 parts of nano-carbon materials, 1 part of nano-whiskers, and 1 part of thermal stabilizer into a high-speed mixer and mixed uniformly to obtain a polyimide for selective sintering powder material.

Embodiment 2

[0032] (1) 84 parts of crystallinity polyimide and 3 parts of polycarbonate resin were pulverized together using an ultrafine pulverizer, and sieved in a mechanical vibrating sieve to obtain a mixed powder.

[0033] (2) adding the mixed powder prepared in step (1), 10 parts of nano-carbon materials, 2 parts of nano-whiskers, and 1 part of thermal stabilizer into a high-speed mixer and mixing uniformly to obtain a polyimide for selective sintering powder material.

Embodiment 3

[0035] (1) Pulverize the crystalline polyimide and polycarbonate resin with an ultra-fine pulverizer respectively, sieve to obtain components of 20-100 microns, and weigh 75 parts of crystalline polyimide and 5 parts of polycarbonate , to obtain mixed powder;

[0036] (2) pulverize the nano-carbon material, nano-whisker and thermal stabilizer respectively, sieve to obtain components of 20-100 microns, mix the mixed powder prepared in step (1), 15 parts of nano-carbon material, 3 parts of nano- The whiskers and 2 parts of heat stabilizer are added into a high-speed mixer and mixed uniformly to obtain a polyimide powder material for selective sintering.

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Abstract

The invention provides a polyimide composition. The polyimide composition is prepared from 70 to 95 parts of crystalline polyimide resin, 5 to 30 parts of nano carbon material, 1 to 5 parts of polycarbonate, 0.1 to 3 parts of nano whisker and 0.1 to 2 parts of heat stabilizer. The defects that a polyimide material additive manufacturing product is large in shrinkage rate and high in porosity are overcome, and the method has wide application prospects in the field of additive manufacturing.

Description

technical field [0001] The invention relates to the field of additive manufacturing, in particular to a polyimide composition for additive manufacturing and a preparation method thereof. technical background [0002] Traditional commercial polymer materials used in additive manufacturing include acrylate polymers, acrylonitrile-butadiene-styrene (ABS) copolymers, polyamide (PA), polycarbonate (PC), etc. The operating temperature of polymers is generally lower than 200 °C, which cannot meet the application requirements of special fields such as aviation and aerospace, such as aircraft engine components (bearings, bushings, casings) and channels. Therefore, in recent years, high-performance engineering plastics with higher temperature resistance grades, such as "high temperature plastics" and "ultra-high temperature plastics", have received great attention. Polyimide (PI), polyetherimide (PEI), polyamideimide (PAI), bismaleimide (BMI) and other imide polymers are used as poly...

Claims

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Application Information

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IPC IPC(8): C08L79/08C08L69/00C08K7/06C08K3/04C08K7/10C08K7/08B33Y70/10
CPCC08L79/08B33Y70/10C08K2201/011C08L2201/08C08L69/00C08K7/06C08K3/041C08K3/04C08K3/042C08K3/045C08K7/10C08K7/08
Inventor 孟思益罗熙雯周利庄王芳
Owner CHANGSHA ADVANCED MATERIALS IND RES INST CO LTD
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