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Sound insulating material

A sound insulation material and thermoplastic resin technology, applied in the field of sound insulation materials, can solve problems such as difficult cutting, large specific weight, and cracking of sound insulation sheets, and achieve the effects of not being easy to bend or warp, improving elongation, and good sound insulation

Inactive Publication Date: 2008-09-03
SEKISUI CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to increase the density to provide sound insulation, the sound insulation sheet contains a filler component in the binder component, so the sound insulation sheet has problems that it has a large specificity, is hard, is difficult to cut and process, and has poor formability such as bending. it is good
[0005] Moreover, the above-mentioned sound-insulating sheet lacks elongation, and even if it is attempted to be molded using a mold, it cannot be molded into a molded product having a desired shape due to cracks or breakage of the sound-insulating sheet.
[0006] Therefore, even if it is desired to form the sound-insulating sheet into a shape that matches the shape of the vibrating metal plate and attach it to a vibrating metal plate with a complex shape such as an automobile bottom steel plate, the sound-insulating sheet cannot be formed correctly. The shape conforming to the shape of the vibrating metal plate has the following problem: gaps appear between the soundproof sheet and the vibrating metal plate, and additional operations are required to fill these gaps

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Knead the foamable resin composition at 110°C for 15 minutes using a test plastic mixer to make it evenly mixed, and then press mold the foamable resin composition at 110°C to prepare a foamable resin composition with a thickness of 2.5 mm. Resin sheet. The foamable resin composition comprises 65 parts by weight of low-density polyethylene (produced by Sumitomo Mitsui Polyolefin Company, trade name LE520), 35 parts by weight of ethylene-vinyl acetate copolymer (produced by Mitsui-DuPont Polymer Chemical Company) , trade name is EVAFLEX EV460, and vinyl acetate content is 19 weight %), the barium sulfate of 150 weight parts (Takehara Chemical Company produces, trade name is W-1), the azodicarbonamide of 4 weight parts (Otsuka Chemical Company Production, trade name UNIFOAM AZ SO-40) and 1 part by weight of zinc stearate (manufactured by Sakai Chemical Company, trade name SZ-2000) as a foaming aid

[0038] The foamable resin sheet was irradiated with electron beams of 2....

Embodiment 2

[0040] Obtain the sound-insulating material according to the method similar to embodiment 1, difference is: barium sulfate is adjusted to 100 weight parts by 150 weight parts, and azodicarbonamide is adjusted to 3 weight parts by 4 weight parts, and zinc stearate is adjusted to 3 weight parts by 1 The weight part was adjusted to 0.8 weight part. The apparent density of the sound insulation material obtained is 0.31g / cm 3 , and its thickness is 3.6mm. The resin expansion ratio of the polyolefin resin constituting the thermoplastic foamed resin sheet was 559.7%.

Embodiment 3

[0042] Obtain the sound-insulating material according to the method similar to embodiment 1, difference is: barium sulfate is adjusted to 50 weight parts by 150 weight parts, and azodicarbonamide is adjusted to 2 weight parts by 4 weight parts, and zinc stearate is adjusted to 2 weight parts by 1 The weight part was adjusted to 0.6 weight part. The apparent density of the sound insulation material obtained is 0.32g / cm 3 , and its thickness is 3.7mm. The resin expansion ratio of the polyolefin resin constituting the thermoplastic foamed resin sheet was 411.4%.

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Abstract

This invention provides a sound insulating material that has excellent sound insulating properties and moldability. The sound insulating material comprises an inorganic compound contained in a thermoplastic resin foam and is characterized in that the inorganic compound is contained in an amount of 30 to 300 parts by weight based on 100 parts by weight of the thermoplastic resin constituting the thermoplastic resin foam. The sound insulating material has excellent sound insulating properties and moldability and can be molded into a form conforming to the shape of a member to be sound insulated by a conventional molding method with good accuracy. Accordingly, the sound insulating material can be stably applied onto the member to be sound insulated, for example, in floor materials of automobiles or partition walls for partitioning an engine room from a vehicle interior without causing a substantial space between the sound insulating material and the member to be sound insulated, and can reliably conduct sound insulation treatment.

Description

technical field [0001] The present invention relates to a sound-insulating material having good sound-insulating properties and formability. Background technique [0002] For a long time, various sound insulation materials have been widely used in vehicles such as automobiles and rail vehicles, and vehicles such as elevators. Especially in automobiles, the intrusion of engine noise into the interior space is an important cause of the deterioration of the interior acoustic environment. Therefore, soundproof materials are used for engines, pedals, and trunks. [0003] As such a sound-insulating material, Patent Document 1 discloses a sound-insulating sheet obtained by kneading and rolling a binder component, a filler component, additives, etc. containing 90% by weight or more of a rubber component. , and make its modulus of elasticity at 20°C 5×10 7 Below Pa. [0004] In order to increase the density to provide sound insulation, the sound insulation sheet contains a filler ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/06G10K11/16G10K11/162
CPCC08J2300/22C08J2323/02C08J2431/00C04B2111/52C08J9/0061C04B26/02C08J9/0066C08J9/103G10K11/162C04B14/368C04B38/02C08J9/06C08J9/22G10K11/16
Inventor 乾延彦山田穰二爱德华·K·奥弗曼斯阿曼德·A·杜伊杰森斯劳伦斯·P·沃格尔斯
Owner SEKISUI CHEM CO LTD
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