Technology for preparing composite hole structure broadband sound absorption material through waste plastic

A technology for waste plastics and sound-absorbing materials, which is used in the environmentally friendly recycling of various waste polymers and solid waste treatment. , the sound absorption material is thick and other problems, to achieve the effect of easy installation, wide sound absorption frequency range, low cost

Inactive Publication Date: 2017-06-23
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the practical problems of mass production of waste plastics and lack of high-value-added recycling technology, the present invention provides a preparation process of light-weight, cheap, and wide-absorbing sound-absorbing materials using waste plastics to solve the problem of traditional sound-absorbing materials being thick and heavy, Disadvantages of high cost and narrow sound absorption frequency range

Method used

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  • Technology for preparing composite hole structure broadband sound absorption material through waste plastic
  • Technology for preparing composite hole structure broadband sound absorption material through waste plastic
  • Technology for preparing composite hole structure broadband sound absorption material through waste plastic

Examples

Experimental program
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Effect test

Embodiment 1

[0023] according to figure 1 The flow chart uses waste agricultural mulching film as raw material, washes it with water, and then air-dries it naturally for later use. Mix 3.6 grams of mulch film with 0.054 grams of azodicarbonamide at 160°C. After the mixing is uniform, the mixed material is made into a flat sheet similar to the shape of the mold. After preheating the mold at 180°C for 10 minutes, the compounded material was placed in the mold and foamed for 40 minutes. After foaming, let it cool naturally to below 100°C and demould. Cut off the surface crust layer of the demoulded material to expose the pore structure, and punch 4 perforations with a diameter of 0.3 cm and uniform gaps and 12 concave holes with a depth of 5 mm on the material, and install the air layer behind it. 10mm sealed rigid bracket. In the frequency range of 200-6400Hz, the highest sound absorption coefficient can reach 0.99 (900Hz), the sound absorption peak width is about 500Hz, and the average ...

Embodiment 2

[0025] according to figure 1 The flow chart uses waste polyethylene plastics as raw materials, washes them with water, and then air-dries them naturally for later use. 40 g of polyethylene was kneaded with 0.60 g of azodicarbonamide at 160° C. for 2 minutes, and then the kneaded material was pressed into a flat sheet approximately in the shape of a mold. After the mold was preheated for 10 minutes at 180° C., the compounded material was placed in the mold and molded and foamed for 40 minutes. After foaming, let it cool naturally to below 100°C and demould. Peel off the surface crust layer of the demoulded material to expose the pore structure, and punch 40 perforations with a uniform gap and a diameter of 0.3 cm on the material, and install it on a sealed rigid support with a thickness of 10 mm behind the air layer. The highest sound absorption coefficient in the frequency range of 160-1280Hz can reach 0.99 (900Hz), the sound absorption peak width is about 600Hz, and the ave...

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Abstract

The invention provides a technology for preparing a sound absorption material which is of a composite hole structure and is broad in sound absorption frequency through waste plastic. The technology specifically includes the processes of mixing, foaming, perforating, back cavity creating and the like. The technology is characterized in that after foaming, perforating, semi-perforating and back cavity treatment are conducted, sound absorption material hole channels are arranged in a criss-cross manner, the product is endowed with good low-frequency, medium-frequency and high-frequency broadband sound absorption effects, and the sound absorption frequency range of the material is greatly enlarged; the machining process is simple and easy to conduct, three waste is not generated, and the finished product can be recovered, re-machined and recycled after being abandoned; and the manufacturing technology is low in construction cost, the engineering installation is simple, the overall engineering thickness is generally 1 cm to 3 cm, the relative density is about 0.50 ton/m<3>, and the technology is suitable for establishing and use of sound absorption facilities of high-speed rails, city elevated roads, bridges, highway tunnels, building ceilings and the like.

Description

technical field [0001] The invention relates to a method and process for preparing sound-absorbing materials by using waste plastics, which belongs to the new technology of solid waste treatment in the field of environmental protection and resource comprehensive utilization, and is especially suitable for environment-friendly resource recycling of various waste high molecular polymers. Background technique [0002] In recent years, with the rapid development of the national economy and the gradual improvement of people's living standards, the problem of noise pollution has become increasingly prominent and has become one of the main environmental problems that endanger people's health. These noises mainly include traffic noise, industrial noise, construction noise and living noise, and their hazards are mainly reflected in the damage to people's hearing and physical and mental health, interference with work, study and life, and damage to buildings and facilities. The main me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C67/20
CPCB29C67/20
Inventor 张付申王磊
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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