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Sound absorption and noise reduction material

A noise reduction and sound absorption technology, applied in the field of sound absorption and noise reduction materials, can solve problems such as sound absorption performance needs to be improved, and achieve the effects of improving the working and living environment, improving low-frequency sound absorption performance, and good degradability

Inactive Publication Date: 2015-03-11
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the sound-absorbing polyurethane material has good sound-absorbing performance in the high-frequency band, but the sound-absorbing performance in the middle and low frequencies needs to be improved.

Method used

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  • Sound absorption and noise reduction material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The filler chooses crushed rice husk with a particle size of 2mm, mixes the components uniformly in the following proportions, and foams them in a constant temperature mold to prepare a foam with a thickness of 40mm. The average sound absorption coefficient in the low frequency range can reach 0.45, The highest sound absorption coefficient is 0.996.

[0022] Rice husk: 5 parts; Modified diphenylmethane diisocyanate: 45 parts; Polyether polyol 330N: 60 parts; Polymer polyol 36 / 28: 40 parts; Catalyst A33: 0.6 parts; Catalyst A-1: ​​0.1 parts parts; silicone oil: 1.8 parts; diethanolamine: 2 parts; melamine phosphate: 10 parts; deionized water: 2 parts.

Embodiment 2

[0024] Complete rice husk is selected as filler, and the following ingredients are uniformly mixed, and foamed and molded in a constant temperature mold to prepare a foam with a thickness of 40mm. The average sound absorption coefficient in the low frequency range can reach 0.59, and the highest sound absorption coefficient is 0.97. .

[0025] Rice husk: 10 parts; Modified diphenylmethane diisocyanate: 40 parts; Polyether polyol 330N: 50 parts; Polymer polyol 36 / 28: 50 parts; Catalyst A33: 0.6 parts; Catalyst A-1: ​​0.1 parts parts; silicone oil: 1.5 parts; diethanolamine: 2 parts; melamine phosphate: 15 parts; deionized water: 2 parts.

Embodiment 3

[0027] Wheat straw with a length of 5 mm is selected as the filler, and the following ingredients are uniformly mixed in the following proportions, and foamed and molded in a constant temperature mold to prepare a foam with a thickness of 40 mm. The average sound absorption coefficient in the low frequency range can reach 0.52, and the highest absorption The sound coefficient is 0.93.

[0028] Wheat straw: 15 parts; Modified diphenylmethane diisocyanate: 45 parts; Polyether polyol 330N: 60 parts; Polymer polyol 36 / 28: 40 parts; Catalyst A33: 0.6 parts; Catalyst A-1: ​​0.2 parts parts; silicone oil: 1.5 parts; diethanolamine: 2 parts; melamine phosphate: 20 parts; deionized water: 2 parts.

[0029] The properties of the material are as follows:

[0030]

[0031] The comparison of the sound absorption coefficient curves of the three embodiments of the present invention figure 1 shown.

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Abstract

The invention discloses a sound absorption and noise reduction material. The material is a polyurethane composite material prepared by taking polyurethane as a base material and an agricultural byproduct as filler. The sound absorption and noise reduction material disclosed by the invention comprises the following components in parts by weight: 5-40 parts of filler, 30-70 parts of modified diphenylmethane diisocyanate, 50-70 parts of polyether polyol 330N, 30-50 parts of polymer polylol 36 / 28, 0.4-0.7 part of catalyst A33, 0.1-0.3 part of catalyst A-1, 1.5-2.5 parts of stabilizer, namely silicon oil, 0.5-3 parts of cross-linking agent, namely diethanolameine and 5-20 parts of flame retardant, namely ammonium polyphosphate and melamine phosphate. The greatest difference between the material disclosed by the invention and a pure polyurethane foam material is as follows: the material has better sound absorption performance at medium and low frequencies and simultaneously has flame resistance, no toxicity and other performances of other general polyurethane materials. The filler used by the material disclosed by the invention is low in cost and easy to obtain, and the preparation process of the material is simple. The material disclosed by the invention is suitable for occasions and environments with strict requirements for acoustics; and by taking the material prepared by taking rice husk as the filler for example, the sound absorption coefficient of the thickness of 40mm can achieve 0.996 (50Hz-1600Hz).

Description

technical field [0001] The invention relates to a polymer composite material, in particular to a sound-absorbing and noise-reducing material. Background technique [0002] Noise pollution has become a contemporary worldwide problem, and it is listed as the world's four major public hazards together with water pollution, air pollution, and solid waste pollution. With the rapid development of industry, agriculture, and transportation, noise pollution is becoming more and more serious, causing harm to people's body and mind, and is increasingly recognized and concerned by people. Noise control In addition to reducing the noise of the noise source, starting from the transmission path, the application of acoustic noise reduction materials is also a very effective method. [0003] Polyurethane can form materials with different functions by changing processing raw materials and fiber resources. It has the advantages of light weight, sound insulation, shock absorption, softness and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/08C08L97/02C08K3/32C08K5/3492C08G18/76C08G18/66C08G18/48C08J9/08
Inventor 张成春王永华任露泉王晶韩志武田丽梅
Owner JILIN UNIV
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