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Hollow microspheres-enhanced polyimide matrix foamed composite material and preparation method thereof

A polyimide-based, composite foaming technology, applied in the field of polyimide materials, can solve the problems of high cost, poor sound absorption and sound insulation, and achieve high glass transition temperature, good sound absorption and sound insulation. resistance, wear-reducing effect

Active Publication Date: 2014-10-08
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a polyimide-based composite foam material reinforced with hollow microspheres to solve the defects of poor sound absorption and sound insulation and high cost of existing polyimide foam materials in the lower frequency range insufficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] The preparation method of the above-mentioned hollow microbead reinforced polyimide-based composite foam material comprises the following steps:

[0029] A) Dissolve aromatic dianhydride in an organic polar solvent, add fatty alcohol, heat to 50-80°C, and reflux for 1-3 hours to obtain an esterification product; add aromatic diamine to the esterification product, and Continue to react for 3 to 7 hours under the action of catalyst and surfactant to obtain foam precursor solution;

[0030] B) Add hollow glass microspheres and foaming agent to the foam precursor solution obtained in step A, stir for 3 to 5 hours, concentrate and dry it, put it into a mold and heat it to 150 to 200°C for pretreatment, and foam After soaking for 60-120 minutes, a foam block is obtained;

[0031] C) heating the foamed block obtained in step B to 280-350° C. for thermal imidization treatment, and after 2-4 hours, the hollow glass microsphere-reinforced polyimide-based composite foam material ...

Embodiment 1

[0045] In parts by weight:

[0046] 100 parts of pyromellitic dianhydride

[0047] 4,4'-diaminodiphenyl ether 100 parts

[0048] 18 parts absolute ethanol

[0049] N,N-Dimethylacetamide 600 parts

[0050] 0.5 parts of triethylamine

[0051] Sodium dodecylbenzene sulfonate 20 parts

[0052] Hollow glass microspheres 10 parts

[0053] 6 parts formic acid

[0054] Add pyromellitic dianhydride and N,N-dimethylacetamide solvent into the reaction flask and stir thoroughly. After the pyromellitic dianhydride is completely dissolved, add absolute ethanol and heat to reflux at 50°C to continue the reaction The diacid diester solution was obtained in 1 hour; the temperature of the diacid diester solution was lowered to room temperature, and 4,4'-diaminodiphenyl ether, triethylamine and sodium dodecylbenzenesulfonate were added, and the reaction was continued for 3 Hours, the foaming precursor solution was obtained; the hollow glass microspheres and formic acid were added to the f...

Embodiment 2

[0058] In parts by weight:

[0059] 3,3’,4,4’-Biphenyltetracarboxylic dianhydride 100 parts

[0060] 3,4'-diaminodiphenyl ether 80 parts

[0061] Methanol 11 parts

[0062] N,N-Dimethylformamide 800 parts

[0063] 2 parts triethanolamine

[0064] Fatty acid glycerides 30 parts

[0065] Hollow glass microspheres 5 parts

[0066] 10 parts of acetic acid

[0067] Add 3,3',4,4'-biphenyltetracarboxylic dianhydride and N,N-dimethylformamide solvent into the reaction flask and stir thoroughly until 3,3',4,4'-biphenyl After the base tetracarboxylic dianhydride is completely dissolved, add methanol and heat to 60°C to reflux, continue the reaction for 2 hours to obtain a diacid diester solution; lower the temperature of the diacid diester solution to room temperature, add 3,4'-diamino Diphenyl ether, triethanolamine and fatty acid glycerides continue to react for 7 hours to obtain a foaming precursor solution; add hollow glass microspheres and acetic acid to the foaming precurso...

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Abstract

The invention provides a hollow microspheres-enhanced polyimide matrix foamed composite material and a preparation method thereof. The apparent density of the foamed composite material is 0.023-0.035g / cm<3>, the foam shrinkage rate is -35.0% to -20.0%, the compressive strength is 0.05-0.35MPa, the impact strength is 20-60KJ / m<2>, and the average sound absorption coefficient within the frequency range of 125-4,000Hz is 0.40-0.51. The preparation method comprises the following steps: mixing aromatic dianhydride with aromatic diamine and a surfactant to obtain a foaming precursor after esterifying the aromatic dianhydride; adding hollow microspheres and a foaming agent to a precursor solution, and heating the solution to obtain a foaming block; finally carrying out thermal imidization on the foaming block to obtain the foamed composite material. According to the method, the foamed composite material with good mechanical property, and excellent sound absorption and sound insulation can be prepared.

Description

technical field [0001] The invention belongs to the technical field of polyimide materials, and in particular relates to a hollow microbead-reinforced polyimide-based composite foaming material and a preparation method thereof. Background technique [0002] Today's society places strict demands on materials used for sound absorption and insulation. Sound-absorbing and insulating materials are used to improve the stereo effect, for example to reduce undesired noise levels. Plastics are usually used for this purpose, and these materials are suitable due to their excellent viscoelasticity, ease of processing and commercial availability. These plastics are usually used in the form of porous foams. [0003] Porous materials are characterized by good sound absorption at high frequencies, but low absorption at lower frequencies. The sound absorption of plastic foam at lower frequencies can be improved or enhanced by introducing various fillers. Among them, hollow microspheres a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08K7/28C08G73/10C08J9/04C08J9/10C08J9/08
CPCC08K7/28C08G73/1007C08G73/1067C08G73/1071C08K2201/003C08L2203/14
Inventor 姚正军刘沛江周金堂李琳
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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