A kind of high sound-absorbing cmt reinforced polyurethane foam composite material for vehicles

Abstract

The invention discloses a high sound-absorbing CMT reinforced polyurethane foam composite material for vehicles. The composite material structure from top to bottom is: polyurethane foam composite layer, which includes a hydrophobic and oil-repellent layer, a breathable sound-absorbing bonding layer, and a polyurethane foam sound-absorbing layer; CMT reinforced composite layer, which includes a bonding layer, a reinforcing layer, and a bonding layer. . Aiming at the phenomenon that the polyurethane foam composite material has high open porosity and poor mechanical properties, and is often used in the interior material of automobile ceilings, the present invention uses the CMT material with high strength and high modulus as its surface reinforcement layer, and through the polyurethane foam The combined effect of the foam composite layer and the CMT reinforced composite layer improves the mechanical properties of the material under the premise of ensuring high sound absorption, heat resistance and good dimensional stability of the material, and can be used in automotive underbody protection materials.

Description

technical field [0001] The invention relates to the field of composite materials for automobile bottom protection, in particular to a high sound-absorbing CMT reinforced polyurethane foam composite material for automobiles. Background technique [0002] The car bottom guard is mainly used to protect the engine and the chassis. The bottom guard can prevent the water and dust on the road from entering the engine compartment, and prevent the hard sand and stones rolled up by the tires from hitting the engine and the uneven road surface and Scratches against the engine by hard objects. In addition, the loading of the car bottom guard can effectively reduce the noise of the engine during driving, thereby improving the comfort of the car. [0003] Since the 1970s, modern multifunctional composite materials with polyurethane foam as the main sound-absorbing material have been developed at home and abroad, and most of the current public documents have applied for patent protection....

AI Technical Summary

Problems solved by technology

Although polyurethane foam has good sound absorption, heat insulation and dimensional stability, its mechanical properties are poor, and it is often used in automotive roof interior materials, which limits its application in the field of automotive interior and exterior decoration.

[0005] Therefore, it is difficult to improve the mechanical properties of polyurethane foam to meet the performance requirements of the car bottom guard through a single structural design of the polyurethane foam.

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