Modified light flexible polyimide foam material and preparation method thereof

A technology of polyimide and foam materials, which is applied in the field of modified lightweight flexible polyimide foam materials and its preparation, can solve the problem that the requirements of dimensional stability cannot be met, the pressure difference of cells increases, and the cost is high. Not inferior to the problem, to achieve the effect of high utilization of raw materials, high opening rate, good sound absorption and noise reduction performance and flame retardant performance

Inactive Publication Date: 2011-07-27
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the cell structure is unstable or not firm at the initial stage of curing, the strength of the cell wall is weak, and the further volatilization of the residual solvent and blowing agent increases the pressure difference of the cells, and the foam shrinks under the action of the pressure difference , that is, molding shrinkage, which can reach more than 30% in severe cases, resulting in high scrap rate, serious material waste, and high cost, which cannot meet the requirements of various high-tech fields for its dimensional stability

Method used

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  • Modified light flexible polyimide foam material and preparation method thereof
  • Modified light flexible polyimide foam material and preparation method thereof
  • Modified light flexible polyimide foam material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] With 253 grams of dimethylformamide, 3.25 grams of tris (4-aminophenyl) amine and 2.14 grams of 3,4'-diaminodiphenyl ether were dissolved in a condensing tube, which was connected to N 2 In the dry four-necked bottle, magnetically stirred, gradually heated to 45 ° C and kept at a constant temperature, then slowly added 6.47 grams of 3,3',4,4'-biphenyltetracarboxylic dianhydride into the four-necked bottle within 1.5 hours, After 8 hours, the temperature was lowered to 25° C. to obtain solution I. Move solution I to a beaker, add 0.17 grams of triethanolamine, 0.15 grams of dibutyltin dilaurate, 0.36 grams of deionized water, 1.36 grams of DC-193, 3.50 grams of polyethylene glycol (PEG-600), 1.99 grams of anhydrous Methanol, and another 41.49 grams of 3,3',4,4'-biphenyltetracarboxylic dianhydride, fully stirred, gradually heated to 80 ° C, and cooled to room temperature after 4 hours of reaction, a viscous foam precursor can be obtained Solution II.

[0063] Measure 20...

Embodiment 2

[0070] With 132 grams of dimethylformamide, 0.48 grams of 1,3,5-tris(4-aminophenoxy)benzene and 2.48 grams of 3,4'-diaminodiphenyl ether were dissolved in a condensing tube, connected with N 2 In the dry four-necked bottle, magnetically stirred, gradually heated to 40°C and kept at a constant temperature, then slowly added 5.93 grams of 1,24,5-pyromellitic anhydride into the four-necked bottle within 3.5 hours, and cooled to At 25°C, solution I was obtained. Move solution I to a beaker, add 0.13 grams of triethanolamine, 0.11 grams of dibutyltin dilaurate, 1.54 grams of deionized water, 3.45 grams of AK-8805, 4.25 grams of polyethylene glycol (PEG-600), 1.67 grams of anhydrous Methanol and another 26.61 g of 1,24,5-pyromellitic anhydride were stirred well, gradually heated to 120° C., and cooled to room temperature after 5 hours of reaction to obtain a viscous foam precursor solution II.

[0071] Measure 25 grams of the above-mentioned precursor solution II, stir rapidly with...

Embodiment 3

[0078]With 375 grams of dimethylacetamide, 44.73 grams of 1,3,5-tris(4-aminophenoxy)benzene and 2.00 grams of 4,4'-diaminodiphenyl ether were dissolved in a condensing tube, which was connected to N 2 In a dry four-necked flask, magnetically stirred, gradually heated to 45°C and kept at a constant temperature, then 24.43 grams of 1,2,4,5-pyromellitic dianhydride and 3.22 grams of 3,3',4,4'- Benzophenone tetracarboxylic dianhydride was slowly added into the four-necked bottle within 3 hours, and cooled to 25° C. after 12 hours to obtain solution I. Move solution I to a beaker, add 0.54 grams of triethanolamine, 0.38 grams of dibutyltin dilaurate, 5.45 grams of deionized water, 5.45 grams of AK-8805, 5.45 grams of polyethylene glycol (PEG-600), 5.25 grams of anhydrous Methanol, and another 244.29 grams of 1,2,4,5-pyromellitic dianhydride, fully stirred, gradually heated to 110 ° C, and cooled to room temperature after 5 hours of reaction, a viscous foam precursor solution II can...

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Abstract

The invention discloses a modified light flexible polyimide foam material and a preparation method thereof. The modified light flexible polyimide foam material is obtained by the reaction of a hyper branched/linear polyamide acid prepolymer formed by aromatic diamine, aromatic triamine, aromatic dianhydride and/or aromatic ester, a catalyst, a surfactant, an additive and an isocyanate, and the curing of the product. The intermediate section of the molecular structure is a hyper branched/linear section formed by aromatic diamine, aromatic triamine, aromatic dianhydride and/or aromatic ester, and the side chain is a crosslinked or/and linear section formed by aromatic dianhydride and/or aromatic ester; the polyimide foam material of the invention has simple process, has a shrinkage of -50.75% to 23.67%, a density of 4.0 kg/m3-31.0 kg/m3, and a glass transition temperature of 230 DEG C-320 DEG C, is a flexible sound-absorbing and noise-reducing polymer foam material, and is applicable tothe fields of aviation and aerospace, ship, and electronic industries.

Description

technical field [0001] The invention relates to a modified lightweight flexible polyimide foam material and a preparation method thereof. Background technique [0002] Polyimide foam material is a new type of lightweight material with a specific chemical structure, high and low temperature resistance range of -250°C to 450°C, and no release of harmful substances. It has excellent heat insulation and sound absorption properties, and good dielectric properties. performance, good flexibility, strength can be designed, radiation resistance, solvent resistance, flame retardant and low smoke and other properties. The performance of polyimide foam material determines that it has multiple uses. At present, it is increasingly used as a material for bearing, heat insulation, shock and noise reduction and insulation in high-tech fields such as aerospace, ships and microelectronics. key material. [0003] At present, there are many preparation methods for polyimide foam materials. U.S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08G73/10C08J9/02
Inventor 詹茂盛刘小艳王凯
Owner BEIHANG UNIV
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