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Preparation method of polyimide foam

A technology of polyimide and polyamic acid, applied in the field of preparation of polyimide foam, can solve problems such as poor mechanical properties, and achieve the effects of high glass transition temperature, good mechanical properties and good mechanical properties

Active Publication Date: 2014-11-26
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the polyimide foam material obtained by the above method has poor mechanical properties under high temperature conditions.

Method used

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  • Preparation method of polyimide foam

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[0024] The embodiment of the present invention discloses a kind of preparation method of polyimide foam, comprises the following steps:

[0025] (A) Reaction of diamine and dianhydride in an organic solvent to obtain a foaming precursor; the diamine includes at least one diamine containing an aromatic heterocycle and a benzene ring in its molecular structure;

[0026] (B) After heating the foaming precursor obtained in the step (A), a foaming block is obtained;

[0027] (C) performing thermal imidization treatment on the foam block obtained in the step (B) to obtain a polyimide foam.

[0028] In the present invention, diamine and dianhydride are used as raw materials. The diamine includes at least one diamine containing an aromatic heterocycle and a benzene ring in the molecular structure, and the diamine containing an aromatic heterocycle and a benzene ring in the molecular structure is preferably 2,5-bis(4-aminophenyl ) pyrimidine, 2,5-bis(4-aminophenyl)pyridine, 2-(4-amin...

Embodiment 1

[0041] Add 61.42 g (0.1906 mol) of benzophenone tetra-acid dianhydride into 100 ml of methanol, heat to reflux for 3 hours, the system becomes clear, and continue to react for 2 hours to obtain a mixed solution. The temperature of the mixed solution was lowered to room temperature, and 26.45g (0.1334mol) of 4,4-diaminodiphenylmethane, 15.00g (0.0572mol) of 2,5-bis(4-aminophenyl)pyrimidine, 1.0g of polysilicon oxane and 200ml tetrahydrofuran, continue to react for 1 hour, and stir to form a homogeneous solution. The above solution was concentrated and dried to obtain a foaming precursor. The foaming precursor was pulverized and spread on an aluminum plate to form a 2 mm powder layer. The powder layer was transferred to an oven and heated at 150°C for 60 minutes to obtain a foam block; then the temperature was raised to 300°C for imidization for 2 hours to obtain a polyimide foam.

[0042] The performance of the polyimide foam obtained is measured, and the result shows that th...

Embodiment 2

[0044] Add 61.42 g (0.1906 mol) of benzophenone tetra-acid dianhydride into 100 ml of methanol, heat to reflux for 3 hours, the system becomes clear, and continue to react for 2 hours to obtain a mixed solution. The temperature of the mixed solution was lowered to room temperature, and 26.45g (0.1334mol) 4,4'-diaminodiphenylmethane and 12.88g (0.0572mol) 2-(4-aminophenyl)-6-aminobenzoxazole were added , 1.0 g of polysiloxane and 200 ml of tetrahydrofuran, and continue to react for 1 hour. Stir to form a homogeneous solution. The above solution was concentrated and dried to obtain a foaming precursor. The foaming precursor was pulverized and spread on an aluminum plate to form a 2 mm powder layer. The powder layer was transferred to an oven and foamed at 150°C for 60 minutes to obtain a foam block; then the temperature was raised to 300°C for imidization for 2 hours to obtain a polyimide foam.

[0045] The performance of the obtained polyimide foam is measured, and the resul...

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Abstract

The invention provides a preparation method of polyimide foam, which comprises the following steps of: enabling diamine and dianhydride to react in organic solvent to obtain foaming precursors, wherein the diamine at least comprises a kind of diamine with a molecular structure which contains a heteroaromatic ring and a benzene ring; heating the foaming precursors to obtain foaming blocks; and conducting thermal imidization treatment to the foaming blocks to obtain the polyimide foam. The polyimide foam which is prepared by adopting the method has the advantages that the glass transition temperature is high, the heat resistance is good, the mechanical properties are good, and especially under the condition of high temperature, the mechanical properties can still be kept to be good. According to experiments, the compressive strength of the polyimide foam prepared by adopting the method is 0.096-0.127MPa; the glass transition temperature is 290-320DEG C; 5% thermal weight loss temperature is 510-530DEG C; and at 200DEG C, when the volume of the polyimide foam is compressed to 50 percent, the compressive strength of the polyimide foam is 0.092-0.121MPa.

Description

technical field [0001] The invention relates to the field of polyimide materials, in particular to a preparation method of polyimide foam. Background technique [0002] With the emergence of artificial synthetic materials such as "polymers", people introduced the concept of "porous materials" into the synthetic plastics industry, resulting in various types of foams that we can use everywhere today. [0003] Compared with traditional foam materials such as polyurethane, polyethylene, and polystyrene, polyimide foam has excellent heat resistance, high temperature barrier properties, noise reduction, impact resistance, dimensional stability, wave permeability and Flame retardant properties, can be used as heat insulation, sound insulation and flame retardant materials, used in aircraft, spacecraft, weaponry, ships, high-speed trains and automobiles and other fields. [0004] US 3249561 discloses a method for preparing polyimide foam plastics. Firstly, polyamic acid is obtained...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10C08J9/00C08L79/08
Inventor 郭海泉陈文慧杜志军邱雪鹏高连勋
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI