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Light flexible polymide foam material and preparation method thereof

A technology of polyimide and foam materials, which is applied in the field of lightweight and flexible polyimide foam materials and its preparation, can solve the problems of inability to meet the requirements of dimensional stability, increase of cell pressure difference, high cost, etc. problems, to achieve the effects of high utilization rate of raw materials, high porosity, good sound absorption and noise reduction performance and flame retardant performance

Inactive Publication Date: 2011-06-15
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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  • Light flexible polymide foam material and preparation method thereof
  • Light flexible polymide foam material and preparation method thereof
  • Light flexible polymide foam material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] With 210 grams of dimethylformamide, 3.60 grams of tris (4-aminophenyl) amines were dissolved in a condensing tube equipped with N 2 In the dry four-necked bottle, magnetically stirred, gradually heated to 45 ° C and kept at a constant temperature, then slowly added 4.96 grams of 3,3',4,4'-benzophenone tetracarboxylic dianhydride into the four-necked bottle within 1 hour After 8 hours, the temperature was lowered to 25°C to obtain solution I. Move solution I to a beaker, add 0.13 grams of triethanolamine, 0.11 grams of dibutyltin dilaurate, 0.24 grams of deionized water, 1.33 grams of DC-193, 3.3 grams of polyethylene glycol (PEG-600), 1.93 grams of anhydrous Methanol, and another 43.17 grams of 3,3',4,4'-benzophenone tetracarboxylic dianhydride, fully stirred evenly, gradually heated to 145 ° C, and cooled to room temperature after 4 hours of reaction to obtain a viscous precursor Body Solution II.

[0059] Measure 25 grams of the above-mentioned precursor solution I...

Embodiment 2

[0066] With 2330 grams of dimethylformamide, 29.91 grams of tris (4-aminophenyl) amines are dissolved in a condensing tube, connected with N 2 In the dry four-necked bottle, magnetically stirred, gradually heated to 45°C and kept at a constant temperature, then slowly added 35.60 grams of 3,3',4,4'-biphenyltetracarboxylic dianhydride into the four-necked bottle within 3.5 hours, After 12 hours, the temperature was lowered to 25° C. to obtain solution I. Move solution I to a beaker, add 0.53 grams of triethanolamine, 0.71 grams of dibutyltin dilaurate, 2.87 grams of deionized water, 9.38 grams of AK-8805, 10.65 grams of polyethylene glycol (PEG-600), 8.12 grams of anhydrous Methanol, and another 353.06 grams of 3,3',4,4'-biphenyltetracarboxylic dianhydride, fully stirred, gradually heated to 125°C, and cooled to room temperature after 5 hours of reaction, a viscous precursor solution can be obtained II.

[0067] Measure 150 grams of the above-mentioned precursor solution II, ...

Embodiment 3

[0074] Dissolve 10.11 grams of 1,3,5-tris(4-aminophenoxy)benzene with 375 grams of dimethylacetamide in a condensing tube equipped 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 5.52 grams of 1,2,4,5-pyromellitic dianhydride into the four-necked bottle within 2 hours, 10 hours After cooling down to 25°C, solution I was obtained. Move solution I to a beaker, add 0.21 grams of triethanolamine, 0.34 grams of dibutyltin dilaurate, 1.48 grams of deionized water, 9.76 grams of AK-8805, 6.77 grams of polyethylene glycol (PEG-600), 3.24 grams of anhydrous Methanol and another 76.34 g of 1,2,4,5-pyromellitic dianhydride were stirred well, gradually heated to 90° C., and cooled to room temperature after 3.5 hours of reaction to obtain a viscous precursor solution II.

[0075] Measure 20 grams of the above precursor solution II, stir rapidly with 9 grams of polymethylene polyphenyl polyisocya...

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Abstract

The invention discloses a light flexible polymide foam material and a preparation method thereof. The light flexible polymide foam material is obtained by reaction and solidification of hyperbranched aromatic polyamide, a catalyst, a surface active agent, an accessory ingredient and isocyanate, wherein the hyperbranched aromatic polyamide is formed by aromatic triamine together with aromatic dianhydride and / or aromatic acid ester. The intermediate section of the molecular structure is a hyperbranched section formed by the aromatic triamine together with the aromatic dianhydride and / or the aromatic acid ester, the side chain of the molecular structure is a cross-linking or / and linear section formed by aromatic dianhydride and / or aromatic acid ester together with isocyanate. The polymide foam material is simple in preparation process, the shrinkage percentage of the polymide foam material is minus 35.34%-21.75%, the density of the polymide foam material is 6.0 kg / m<3>-31.0 kg / m<3>, and the glass-transition temperature of the polymide foam material is 235 DEG C-320 DEG C; and the polymide foam material is a flexible sound-absorbing noise-reducing polymer foam material and is mainly suitable for the fields of aerospace, ships and electronic industry.

Description

technical field [0001] The invention relates to a 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. patents...

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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