Low-frequency micro-perforated sound-absorbing composite material and manufacturing method thereof

A sound-absorbing composite material and a composite material technology are applied in the field of low-frequency micro-perforated sound-absorbing composite materials and their manufacturing, which can solve the problems of complex fabrication of space absorbers, high manufacturing costs, and inability to be widely used, and achieve a good potential economy. Benefit, low cost, wide range of effects

Inactive Publication Date: 2017-02-15
HUNAN INSTITUTE OF ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the frequency selectivity of a single resonator is very strong, and there is a technical problem of narrow sound absorption frequency band
Thin-film vibration-type sound-absorbing structure has excellent mid-frequency sound-absorbing characteristics, but it is usually attached to other materials; and it needs to be hung in a position with high sound energy flux density (such as near the sound source, where the reflection is focused); there is space Technical problems such as complex production of suction body, high manufacturing cost, and small application range
In addition, sound-absorbing materials are designed into various geometric shapes, such as spheres, cones, cylinders, hexahedrons, tetrahedrons, etc., so that although the effective area of ​​sound absorption is enlarged, better absorption can be obtained. Acoustic effect; however, the production process is more complicated, and it will be limited by the use of space, so it cannot be widely used

Method used

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  • Low-frequency micro-perforated sound-absorbing composite material and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] According to the mass ratio, take 100 parts of EPDM and 10 parts of zeolite powder to prepare the sound-absorbing composite material according to the following steps:

[0035] The first mixing:

[0036] (1) Keep the temperature of the rollers on the twin-roll mill at room temperature;

[0037] (2) Add 100 parts of EPDM rubber between the rollers;

[0038] (3) Add 10 parts of zeolite powder to the rubber again, knead the EPDM rubber and the zeolite powder, due to the difference of the surface rotation speed of the two rollers, do artificial auxiliary mixing with a cutter to make the uniform mixing;

[0039] (4) The total mixing time is 20 minutes. After the mixing is uniform, the mixing material is peeled off from the roller, and then shredded into mixed granules for hot pressing.

[0040] The second step of hot pressing:

[0041] (1) Spread the kneaded scrap evenly in the mold, clamp the upper and lower molds with steel plates, and use a layer of PE film between the ...

Embodiment 2

[0048] According to the mass ratio, 100 parts of EPDM and 10 parts of zeolite powder were taken, and the steps of preparing the sound-absorbing material were the same as those in Example 1. The process differs from Example 1 in that the micro-perforation diameter of the rubber-based composite material is 0.5 mm, the aperture ratio is 0.5%, the thickness is 1 mm, and the composite material density is 9.9 g / cm3. The sound absorption effect of the final formed composite material is as follows figure 1 shown in 2#.

Embodiment 3

[0050] According to the mass ratio, 100 parts of EPDM and 10 parts of zeolite powder were taken, and the steps of preparing the sound-absorbing material were the same as those in Example 1. The process is different from Example 1 in that the micro-perforation diameter of the rubber-based composite material is 0.5 mm, the pore diameter is 2.5%, the thickness is 1 mm, and the density of the composite material is 9.9 g / cm3. The sound absorption effect of the final formed composite material is as followsfigure 1 shown in 3#.

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Abstract

The invention discloses a low-frequency micro-perforated sound-absorbing composite material and a manufacturing method thereof. The composite material comprises ethylene propylene diene monomer (EPDM) and zeolite powder, and the mass ratio of EPDM to zeolite powder is 80-100:10-30. The composite material is provided with micro-pores. The thickness of the composite material is 1 to 3 mm; the density is 9.9 to 15.9 g/cm3; the porosity is 0.5 to 2.5%; and the diameter of micro-pores is in a range of 0.5 to 1 mm. The preparation method of the composite material comprises steps of mixing, hot-press moulding, and micro-punching. The provided composite material has the advantages of better structure, better sound absorbing performance, lower production cost, and wider application range, can generate more economic benefits, and is more suitable for industrial production, popularization, and application.

Description

technical field [0001] The invention relates to the low-frequency sound-absorbing material and the field of preparation thereof, in particular to a low-frequency micro-perforated sound-absorbing composite material and a manufacturing method thereof. Background technique [0002] By using a suitable sound-absorbing structure, a better low-frequency sound-absorbing effect can be obtained, making up for the lack of sound-absorbing performance of some sound-absorbing materials at low frequencies. At present, the commonly used sound-absorbing material structures include thin-plate resonance sound-absorbing structure, perforated plate resonance sound-absorbing structure, film vibration type, micro-perforated plate sound-absorbing structure and space absorber. The perforated plate sound-absorbing structure has good sound absorption performance in medium and high frequency. However, the frequency selectivity of a single resonator is very strong, and there is a technical problem of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/16C08K7/26B29C43/02B26F1/24
CPCC08K7/26B26F1/24B29C43/003B29C43/02C08L23/16
Inventor 王坤
Owner HUNAN INSTITUTE OF ENGINEERING
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