High sound absorption CMT reinforced polyurethane foam composite material for vehicles

Abstract

The invention discloses a high sound absorption CMT reinforced polyurethane foam composite material for vehicles. The composite material structurally comprises a polyurethane foam composite layer anda CMT reinforced composite layer, wherein the polyurethane foam composite layer comprises a hydrophobic oil-repellent layer, a gas permeable and sound-absorbing adhesive layer and a polyurethane foamsound-absorbing layer; the CMT reinforced composite layer comprises a bonding layer, a reinforcing layer and a bonding layer. For the situation that the polyurethane foam composite material has a higher aperture ratio and poor mechanical properties and is usually taken as an interior material of roofs of the vehicles, a CMT material with the characteristics of high strength and high modulus is taken as a surface reinforcing layer, and the polyurethane foam composite layer and the CMT reinforced composite layer cooperatively act, so that the mechanical properties of the material are improved under the premise of ensuring high sound absorption, heat resistance and good dimensional stability of the material, and the material can be applied to automotive bottom protection.

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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