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A kind of preparation method of carbon fiber powder reinforced polyimide foam material

A technology of carbon fiber powder and polyimide, which is applied in the field of preparation of fibrous powder reinforced polyimide foam materials, can solve the problems of product performance controllability and low repeatability, waste of raw materials, and reduction of foam mechanical properties. Achieve the effects of high performance controllability and repeatability, improved mechanical properties, and improved compressive strength

Active Publication Date: 2017-06-06
BAODING KAIBORUI MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First use aminosiloxane to end-cap, prepare polyimide precursor powder containing siloxane, first heat at high temperature to prepare microspheres, and prepare high-density siloxane-modified polyimide foam plastics by microsphere molding. The method overcomes the defect that by-products are easily produced during the preparation of diacid diester, but the introduction of siloxane reduces the mechanical properties of the foam
The bonding strength between adjacent foams of the polyimide foam prepared by the microsphere method is smaller than that of the polyimide foam prepared by the powder method, which leads to a decrease in its mechanical properties
In addition, it also requires a special mold, the production efficiency is low, and the bottom and surface of the foam have many defects, resulting in a lot of waste of raw materials
[0010] The polyimide foam materials prepared by the above patents and documents are either soft foam materials, although they can effectively reduce the weight of parts, but their mechanical properties are poor.
Or high-density rigid foam materials, these materials are dense, and the preparation process is complicated, the cost is high, the production efficiency is low, the product performance controllability and repeatability are low, which limits the large-scale production of polyimide foam materials Production and application, this is also the main reason why there has been no better commercialized polyimide foam products in China

Method used

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  • A kind of preparation method of carbon fiber powder reinforced polyimide foam material
  • A kind of preparation method of carbon fiber powder reinforced polyimide foam material
  • A kind of preparation method of carbon fiber powder reinforced polyimide foam material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Weigh 32.2g (0.1mol) of 3,3',4,4'-benzophenone tetracarboxylic dianhydride (BTDA) into a 250ml three-neck flask, measure 100ml of ethanol and 20ml of tetrahydrofuran into it, add dropwise 0.06 g of 1-methylimidazole as a catalyst, and then heated to reflux at 70°C for 2 hours. Add 0.26g fluorocarbon surfactant and 1.05g (2wt%) carbon fiber powder, after fully stirring, add 20.0g (0.1mol) of 4,4'-diaminodiphenyl ether (ODA), and then Heat and reflux for 2 hours to obtain a precursor solution of BTDA / ODA. After the reaction, excess solvent was distilled off under reduced pressure, and the obtained resin was further dried in a vacuum oven, and the volatile content of the solvent was controlled to 12 wt%. Then grind the resin into powder, and screen the powder with a particle size of 100-150 μm. The graphite plate is used as the lower heat transfer plate for foaming, and a layer of kaolin is evenly spread and compacted on it, the precursor powder is spread on the kaolin, ...

Embodiment 2

[0047] Weigh 32.2g (0.1mol) of 3,3',4,4'-benzophenone tetracarboxylic dianhydride (BTDA) into a 250ml three-neck flask, measure 100ml of ethanol and 20ml of tetrahydrofuran into it, add dropwise 0.06 g of 1-methylimidazole as a catalyst, and then heated to reflux at 70°C for 2 hours. Add 0.26g fluorocarbon surfactant and 3.12g (6wt%) carbon fiber powder, after fully stirring, add 20.0g (0.1mol) of 4,4'-diaminodiphenyl ether (ODA), and then Heat and reflux for 2 hours to obtain a precursor solution of BTDA / ODA. After the reaction, the excess solvent was distilled off under reduced pressure, and the obtained resin was further dried in a vacuum oven, and the volatile content of the solvent was controlled to 13 wt%. Then grind the resin into powder, and screen the powder with a particle size of 75-100 μm. The graphite plate is used as the foamed lower heat transfer plate, and a layer of kaolin is evenly spread and compacted on it, the precursor powder is spread on the kaolin, th...

Embodiment 3

[0051] Weigh 32.2g (0.1mol) of 3,3',4,4'-benzophenone tetracarboxylic dianhydride (BTDA) into a 250ml three-neck flask, measure 100ml of ethanol and 20ml of tetrahydrofuran into it, add dropwise 0.06 g of 1-methylimidazole as a catalyst, and then heated to reflux at 70°C for 2 hours. Add 0.26g fluorocarbon surfactant and 2.08g (4wt%) carbon fiber powder, after fully stirring, add 20.0g (0.1mol) of 4,4'-diaminodiphenyl ether (ODA), and then Heat and reflux for 2 hours to obtain a precursor solution of BTDA / ODA. After the reaction, the excess solvent was distilled off under reduced pressure, and the obtained resin was further dried in a vacuum oven, and the volatile content of the solvent was controlled to 15 wt%. Then grind the resin into powder, and screen the powder with a particle size of 75-100 μm. The graphite plate is used as the lower heat transfer plate for foaming, and a layer of kaolin is evenly spread and compacted on it, the precursor powder is spread on the kaoli...

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Abstract

The invention provides a method for preparing polyimide foam material reinforced by carbon fiber powder. By adding a small amount of carbon fiber powder, the mechanical properties of the foam material can be significantly improved, and the foam material can exhibit high performance at a relatively low density. Strength of. Compared with polyimide foam without carbon fiber powder of the same density, the compressive strength of polyimide foam with carbon fiber powder can be increased by 3-7 times. The process method of the present invention does not require a specially processed mold, only needs a graphite plate, has no shape limitation, no volume limitation, can prepare polyimide foam materials with any area and volume size, and can realize high-efficiency production. The foaming process and method proposed by the present invention can completely eliminate defects at the bottom and surface of the foam, and effectively improve the utilization rate of raw materials. The resulting polyimide foam composite material is light in weight, has uniform pore size, has no defects, and has high strength.

Description

[0001] 【Technical field】 [0002] The invention belongs to the technical field of polymer materials, and relates to a preparation method of a fibrous powder reinforced polyimide foam material. [0003] 【Background technique】 [0004] Polyimide (PI) refers to a class of aromatic heterocyclic polymers containing imide rings in the molecular chain. The rigid structure of the macromolecular chain and the strong force between molecules endow the polyimide material with many excellent properties. , such as high temperature resistance and low temperature resistance, high strength and modulus, insulation, flame retardancy, and high chemical stability. Polyimide foam material combines the high performance of polyimide and the low density of foam material. It has been widely used in cutting-edge technologies such as aviation, aerospace, and navigation as key materials such as heat insulation, shock absorption and noise reduction, and insulation. field. [0005] In view of the excellent...

Claims

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Application Information

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IPC IPC(8): C08L79/08C08K7/06C08G73/10C08J9/00
CPCC08G73/1007C08G73/1067C08G73/1071C08J9/0085C08J2379/08C08K7/06C08L2203/14C08L2205/24C08L79/08
Inventor 张广成李建伟范晓龙张新宇李建通马忠雷周立生
Owner BAODING KAIBORUI MACHINERY MFG