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Polyimide sound absorption foam with spherical pit microstructure and preparation method of polyimide sound absorption foam

A polyimide sound-absorbing and micro-structure technology, which is applied in the direction of sound-producing equipment and instruments to achieve the effect of improving the degree of transformation, the degree of improvement is significant, and the operation process is simple

Active Publication Date: 2020-12-25
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] For polymer sound-absorbing foam materials, the research on the microstructure design of the matrix resin skeleton and window surface and the influence of microstructure on the material's sound-absorbing performance is still blank.

Method used

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  • Polyimide sound absorption foam with spherical pit microstructure and preparation method of polyimide sound absorption foam
  • Polyimide sound absorption foam with spherical pit microstructure and preparation method of polyimide sound absorption foam
  • Polyimide sound absorption foam with spherical pit microstructure and preparation method of polyimide sound absorption foam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In a disposable plastic cup, 40g of N,N-dimethylformamide solution of 45% 3,3',4,4'-benzophenone tetra-acid dimethyl, 3.2g of T12 , Dabco33, a catalyst prepared from triethanolamine at a mass ratio of about 1:2:5, 20g of a surfactant prepared from AK8805 and PEG600 at a mass ratio of 1:1, and 4.8g of deionized water, mixed evenly as Foaming white material; weigh 60g of polyisocyanate and add it to a disposable plastic cup as foaming black material; after mixing the foaming white material and foaming black material evenly, foam molding to obtain a polyimide foam intermediate ; Demoulding the foam intermediate and placing it in a blast drying oven at 180° C. for 2 hours, finally obtaining a polyimide sound-absorbing foam with a microstructure on the inner surface of spherical pits. see figure 1 with figure 2 As shown, the diameter of the spherical pit structure on the resin skeleton of the foam matrix and the surface of the window is 6-8 μm, and wrinkles appear on the ...

Embodiment 2

[0036] In a disposable plastic cup, 44g of N,N-dimethylacetamide solution of 47% 3,3',4,4'-biphenyltetraic acid diethyl ester, 3.2g of T12, Dabco33 , triethanolamine catalyst prepared in a mass ratio of about 1:2:5, 22g of surfactant prepared by DC193 and PEG1000 in a mass ratio of 0.8:1, 4.8g of deionized water, mixed evenly as foam White material; The polyisocyanate that weighs 60g joins in the disposable plastic cup, as foaming black material; After foaming white material and foaming black material are mixed, foam molding obtains polyimide foam intermediate; The foam intermediate was released from the mold and placed in a blast drying oven at 180°C for 2 hours to obtain a polyimide sound-absorbing foam with a microstructure on the inner surface of spherical pits. The diameter of the spherical pit structure on the resin skeleton of the foam matrix and the surface of the window is 8-10 μm, and wrinkles appear on the surface of some pits.

[0037] The polyimide sound-absorbin...

Embodiment 3

[0039]In a disposable plastic cup, 25g of N-methylpyrrolidone solution of 77% pyromellitic acid diisopropyl, 3.2g of T12, Dabco33, triethanolamine in a mass ratio of about 1:2:5 Catalyst prepared in proportion, 23g of surfactant prepared by PMX200 and PTMG2000 at a mass ratio of 1.2:1, 4.8g of deionized water, mixed evenly as foaming white material; weighing 60g of polyisocyanate added to a disposable In a plastic cup, it is used as a foaming black material; after mixing the foaming white material and the foaming black material evenly, foaming is formed to obtain a polyimide foam intermediate; the foam intermediate is demoulded and placed in a blast drying at 180°C Keep it in the box for 2 hours, and finally obtain a polyimide sound-absorbing foam with a microstructure on the inner surface of spherical pits. The diameter of the spherical pit structure on the resin skeleton of the foam matrix and the surface of the window is 5-7 μm, and wrinkles appear on the surface of some pi...

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Abstract

The invention discloses polyimide sound absorption foam with a spherical pit microstructure and a preparation method of the polyimide sound absorption foam. The preparation method comprises the following steps of: S1, preparing a foaming white material containing a non-ionic surfactant, wherein the total part of the foaming white material is 250-450 parts by weight, the use amount of the non-ionicsurfactant for preparing the foaming white material is 75-125 parts by weight, the non-ionic surface active agent is composed of polyhydric alcohol and polysiloxane-polyether copolymer, and the massratio of polyhydric alcohol to polysiloxane-polyether copolymer is 0.8: 1 to 1.2: 1; S2, uniformly mixing the foaming white material containing the non-ionic surfactant with a foaming black material,and carrying out foaming molding to obtain a polyimide foam intermediate; and S3, demolding the foam intermediate, and curing the foam intermediate in a blast drying oven to finally obtain the polyimide sound absorption foam with a spherical pit microstructure. The prepared polyimide sound absorption foam can improve the reflection and absorption effects of sound waves in foam holes so as to enhance the sound wave consumption capacity of the material.

Description

technical field [0001] The invention relates to a polyimide foam material and a preparation method thereof, in particular to a polyimide sound-absorbing foam with spherical pit microstructure and a preparation method thereof. Background technique [0002] There are three main sound absorption mechanisms of foam materials: the first is that the air molecules in the porous sound-absorbing material rub against the pore wall, and the sound energy is converted into heat energy for dissipation; the second is that when the longitudinal sound wave penetrates the porous material, the pores in the pores The air in the air is periodically compressed and released, resulting in energy consumption in the process of energy conversion; the third is that the sound energy is converted into mechanical energy and heat energy through hole wall resonance. It can be seen that the surface microstructure of the hole wall plays a non-negligible role in the dissipation of sound energy by the sound-abs...

Claims

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Application Information

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IPC IPC(8): C08J9/30C08L79/08C08G73/10G10K11/162
CPCC08J9/30C08G73/1035G10K11/162C08J2379/08Y02A50/20
Inventor 孙高辉任晓荷王君韩世辉陈蓉蓉段天娇
Owner HARBIN ENG UNIV
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