A kind of dry method automobile sound-absorbing ceiling and preparation method thereof

Abstract

The invention discloses a dry-process sound-absorbing ceiling for automobiles, which is formed by post-processing the ceiling slabs. The ceiling slabs are composed of 5-layer board structures, wherein the first layer board is made of weight ratio Made of 2-2.5:1 glass fiber and polyethylene rubber powder; the second layer is made of modified expanded polystyrene; the third layer is made of glass fiber modified polyethylene rubber powder : the fourth layer is made of modified expanded polystyrene; the fifth layer is made of glass fiber and polyethylene rubber powder with a weight ratio of 2-2.5:1, and the present invention is used to reduce the dry ceiling The weight of the product can be reduced, and the NVH sound absorption performance of the ceiling itself can be improved.

Description

technical field [0001] The invention belongs to the field of car interior materials, and in particular relates to a dry-process sound-absorbing ceiling for cars and a preparation method thereof. Background technique [0002] In order to follow the law of mass, traditional sound insulation materials usually choose dense and high-quality metal and inorganic materials such as steel, brick, and concrete structures, mainly to reduce the transmission of sound waves through large inertial acoustic resistance. However, many traditional sound insulation materials are relatively bulky, have poor processing performance, and have high production costs, which greatly limit their application range. At the same time, with the rapid development of modern technology and other industries such as automobiles, high-speed trains, aerospace, etc., and people's higher and higher requirements for living environment and quality, for light weight, easy processing and good sound insulation performance...

AI Technical Summary

Problems solved by technology

However, compared with most metal materials and inorganic materials, general-purpose polymer materials have lower modulus and areal density, and their sound insulation performance is poor when used alone as a sound insulation material. Therefore, the necessary structure must be carried out on polymer materials It is designed and modified to improve its ability to block sound waves; at the same time, in the field of automotive roof materials, in order to improve the toughness and strength of the roof, glass fibers are often added to it, but the length of the glass fibers is different. It is easy to break under such conditions, thereby reducing the mechanical properties of the ceiling material;

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