Heat-insulating and sound-absorbing honeycomb core material and preparation method thereof

A honeycomb core material and sound absorption technology, which is applied in the field of foam composite materials and its preparation, can solve the problems of heat insulation and sound absorption performance, poor temperature resistance of materials that have not been paid attention to, and reduce the flame retardancy and temperature resistance of core materials. Excellent sound absorption and heat insulation performance, the effect of improving the opening degree

Active Publication Date: 2020-01-31
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, porous nitrile rubber is flammable, has poor temperature resistance, and has high toxicity of combustion smoke, which greatly reduces the flame retardancy and temperature resistance of the core material. The process is complicated and the production cost is high, which is not conducive to large-scale production.
CN103587159A, CN201317133Y, US005338594A and other patents successively disclose the method of filling the honeycomb core grid by pressing polyurethane foam and foaming the polycarbonate precursor film to improve the thermal insulation performance of the honeycomb core material, but the acoustic performance of the material is not reported
Although the acoustic performance of the material has been significantly improved, due to the fully open-cell structure of the melamine foam, its thermal insulation performance is poor, its brittleness is high, and it is easy to fall off, and the overall preparation process of the material is complicated, and the accuracy of the process parameters is relatively low. High, requires post-processing procedures, and engineering production is difficult
[0004] At the same time, the foam-filled honeycomb core material prepared by the above method cannot be used directly, and post-operations such as cutting off the foam growing outside the honeycomb core material are still required
[0005] Among the several patents applied by the applicant, the polyimide foam composite materials disclosed in CN104910380A, CN104804190A, etc., and the polyimide foam disclosed in CN105315464B did not pay attention to the heat insulation and sound absorption properties of the materials, and their heat insulation and sound absorption properties also failed to achieve the ideal situation

Method used

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  • Heat-insulating and sound-absorbing honeycomb core material and preparation method thereof
  • Heat-insulating and sound-absorbing honeycomb core material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Weigh 120 grams of N,N-dimethylformamide solution of 3,3',4,4'-benzophenone tetraacid dimethyl ester with a solid content of 66%, 6 grams of triethanolamine, polyethylene oxide surface Activator polyethylene glycol 600 and polyether siloxane surfactant AK8805 are mixed according to the mass ratio of 1:1 surfactant 12 grams, deionized water 8 grams in a plastic cup, stir with a glass rod to get The foaming white material is then placed in a thermostat at 10 degrees Celsius and stored for use; accurately weigh 63 grams of polymethylene polyphenyl polyisocyanate at zero degrees Celsius and pour it into the foaming white material, and use a mechanical stirring paddle at 1000 rpm After stirring at a rotating speed for 25 seconds, quickly pour it into a square steel experimental mold with an upper opening with an inner cavity size of 30cm*15cm*5.1cm and scrape it flat; the pre-cut density is 48kg / m 3 , the core grid size is 4.8mm, and the aramid paper honeycomb core material ...

Embodiment 2

[0046] Referring to Example 1, the difference between this example and Example 1 is that the surface activity of the polyoxyethylene surfactant polyethylene glycol 600 and polyether siloxane surfactant L580 mixed at a mass ratio of 1:1 was weighed. 35 grams of agent, 21 grams of deionized water, all the other are identical with embodiment 1.

[0047] figure 1 It is a photo of the test sample of the honeycomb core material prepared in Examples 1 and 2 of the present invention. in figure 1 The sample on the right is the sample of embodiment 2.

[0048] The properties of the heat-insulating and sound-absorbing honeycomb core material prepared in this example are as follows:

[0049] The density of filled polyimide foam is 49kg / m 3 ;The opening degree is 53%;The density of the honeycomb core material is 97kg / m 3 ;The thermal conductivity is 0.051W / (m K); the starting frequency of the sound absorption coefficient greater than 0.2 is as low as 166Hz; the average sound absorptio...

Embodiment 3

[0051] Referring to Example 1, the difference between this example and Example 1 is that the weight of various raw materials for preparing foam slurry is half of that in Example 1, and the rest is the same as Example 1.

[0052] figure 2 It is a scanning electron micrograph of the polyimide foam in the honeycomb core material prepared in Example 3 of the present invention. From figure 2 The honeycomb structure of the polyimide foam can be seen.

[0053] The properties of the heat-insulating and sound-absorbing honeycomb core material prepared in this example are as follows:

[0054] The density of filled polyimide foam is 27kg / m 3 ; Opening 54%; Honeycomb core material density 75kg / m 3 ;The thermal conductivity is 0.050W / (m K); the starting frequency of the sound absorption coefficient greater than 0.2 is as low as 187Hz; the average sound absorption coefficient in the 100-1000Hz frequency band is 0.41, and the average sound absorption coefficient of each frequency point...

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Abstract

The invention discloses a heat-insulating and sound-absorbing honeycomb core material and a preparation method thereof. The preparation method is characterized in that the dosage weight ratio of an aromatic anhydride derivative solution to a catalyst to a surfactant to a foaming agent to an isocyanate which are dissolved in a polar solvent is controlled; the length, width and depth three-dimensional size of the heat-insulating and sound-absorbing honeycomb core material is controlled by the length, width and depth three-dimensional size ratio of the inner cavity of a mold; and the ratio of themass of a foaming slurry to the volume of the inner cavity of a closed system is controlled, so that the density of polyimide foam compounded with the heat-insulating and sound-absorbing honeycomb core material is 12-100kg / m < 3 >, and the opening degree is 50-60%, and the heat-insulating and sound-absorbing honeycomb core material is obtained. The heat-insulating and sound-absorbing honeycomb core material can achieve the heat-insulating and sound-absorbing performance without being filled with different functional particles, and can be directly applied without post-processing.

Description

technical field [0001] The invention relates to a foam composite material and a preparation method thereof, in particular to a heat-insulating and sound-absorbing honeycomb core material and a preparation method thereof. Background technique [0002] Honeycomb core material, due to its low density, excellent mechanical properties, and high specific strength, has been widely used as a lightweight structural material in the fields of aerospace, automobiles, and high-speed trains. However, due to its hollow structure, the honeycomb core material itself does not have the function of heat insulation and sound absorption, especially the sound absorption performance is almost zero, and the sound absorption coefficient of each frequency point is below 0.2, so it cannot meet the requirements of aerospace, ship and other fields. The multi-functional requirements of structural materials have limited their application sites. [0003] Patent CN107310225A discloses a method for improving...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08L77/10C08G73/10C08J9/08
CPCC08J9/08C08G73/1035C08J2379/08C08J2205/05
Inventor 孙高辉张浩张力文李嘉兴韩世辉陈蓉蓉王君
Owner HARBIN ENG UNIV
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