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Polyurethane elastomer phononic crystal noise-reducing film and preparation method thereof

A polyurethane elasticity, sub-crystal technology, applied in chemical instruments and methods, synthetic resin layered products, transportation and packaging, etc. High efficiency, good barrier effect and strong applicability

Inactive Publication Date: 2019-07-16
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problems of low low-frequency sound insulation effect of traditional sound insulation technology and the failure to effectively utilize the sound insulation ability of phononic crystals, etc., and proposes polyurethane elastomer phononic crystal sound-absorbing film and its manufacturing method

Method used

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  • Polyurethane elastomer phononic crystal noise-reducing film and preparation method thereof
  • Polyurethane elastomer phononic crystal noise-reducing film and preparation method thereof
  • Polyurethane elastomer phononic crystal noise-reducing film and preparation method thereof

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Embodiment Construction

[0019] The polyurethane elastomer phononic crystal sound-absorbing membrane of the present invention includes at least four periodic components 8, and each periodic component 8 is composed of a polyurethane layer 9 and a vibrator layer 10, wherein the vibrator layer 10 is covered by a polymer 11 with a large number of microbead vibrators 1, the microbead vibrator 1 is composed of a metal microbead 2 covered with a layer of soft elastomer 3; the melt lamination equipment required for its manufacturing method consists of an extrusion unit 12, a confluence unit 13, a lamination unit 14, and a head unit Composed of 15, the two extrusion units 12 are respectively connected with the confluence unit 13, the confluence unit 13 is followed by one or more lamination units 14, and the last lamination unit 14 is connected with the head unit 15; the confluence unit 13 has a confluence channel 16 , there are stacked flow channel I 17 and stacked flow channel II 18 in the stacking unit 14, et...

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Abstract

The invention relates to a polyurethane elastomer phononic crystal noise-reducing film and a preparation method thereof. The noise reducing film comprises at least four periodic components, each periodic component is composed of one polyurethane layer and one vibrator layer, wherein each vibrator layer is formed by coating a large amount of microbead vibrators by a polymer, and each microbead vibrator is formed by coating each metal microbead by a layer of soft elastomer; and the preparation method comprises the following steps: the microbead vibrators formed by coating the metal microbeads bythe soft elastomers and polymer pellets are uniformly mixed, the mixed material is subjected to melt extrusion by one extrusion unit, the polyurethane raw material is subjected to melt extrusion by another extrusion unit, the extrudate enters a confluence unit, the confluent material sequentially passes through m lamination units, partition, torsion and lamination are performed for n times in n torsion flow channels in each lamination unit to form the phononic crystals in which the vibrator layers and the polyurethane layers are alternately arranged. The preparation process of the noise reducing film provided by the invention is very simple, the production efficiency is high, large-scale production is easy to realize, and the noise reducing film has strong applicability, and can cover thesurface of a large target to realize a noise reducing function.

Description

technical field [0001] The invention belongs to the technical field of new materials and advanced manufacturing, and relates to a polyurethane elastomer phononic crystal sound-absorbing membrane and a manufacturing method thereof. Background technique [0002] With the rapid development of aerospace, high-speed trains, power transmission and transformation projects, etc., the problem of noise is becoming more and more serious, which has attracted widespread attention. In daily life, noise interferes with people's normal life and work, and long-term exposure to high noise environments will cause harm to people's health. In production practice, high noise will affect the accuracy of the instrument and even cause the instrument to fail or be damaged. In the field of military defense, noise reduction and stealth are the key technologies of submarines. Therefore, noise control is a very important task in both civilian and military fields. [0003] The traditional sound absorpt...

Claims

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Application Information

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IPC IPC(8): B32B25/20B32B25/04B32B25/08B32B25/02B32B27/06B32B27/40B32B7/04B32B33/00B29C48/08B29C48/18
CPCB29C48/08B29C48/18B29K2075/00B32B5/18B32B7/04B32B25/02B32B25/045B32B25/08B32B25/20B32B27/06B32B2266/0278B32B2307/102B32B2419/00B32B2605/12
Inventor 杨卫民谭晶刘海超丁玉梅谢鹏程阎华郎增科李思奇
Owner BEIJING UNIV OF CHEM TECH
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