Dry method automobile acoustic absorption roof and preparation method thereof

Abstract

The invention discloses a dry method automobile acoustic absorption roof. The roof is prepared from a roof blank plate through postprocessing forming. The roof blank plate is composed of five layers of plate structures, wherein the first plate layer is prepared from glass fibers and polyethylene adhesive powder with the weight ratio being 2-2.5 to 1; the second plate layer is made from modified expanded polystyrene; the third plate layer is prepared from fiberglass modified polyethylene adhesive powder; the fourth plate layer is prepared from modified expanded polystyrene; and the fifth plate layer is prepared through glass fibers and polyethylene adhesive powder with the weight ratio being 2-2.5 to 1. Through the dry method automobile acoustic absorption roof, the weight of the dry method roof is lowered, the product lightweight is achieved, and the NVH acoustic absorption performance of the roof 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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