A kind of high-foaming sound insulation material for vehicles and preparation method thereof

Abstract

The invention relates to a method for preparing an automotive sound-insulation material, and mainly relates to a high-performance EVA (ethylene vinyl acetate copolymer) foam damping material and a method for preparing the same. Graphene is used as a filler for the high-performance EVA foam damping material, and an EPDM (ethylene-propylene-diene monomer) is used as a modified material for the high-performance EVA foam damping material. The method includes preparation procedures of mixing ethylene-vinyl acetate resin, ethylene-propylene-diene monomer rubber, fumed silica, filling agents, the functionalized graphene and plasticizers with one another in an internal mixer (at the temperature of 85 DEG C and the rotational speed of 30 revolutions / min for 10min) to obtain mixed compounds; adding foaming agents, foaming agent accelerators and cross-linking agents into the mixed compounds to continue mixing (at the temperature of 85 DEG C and the rotational speed of 30 revolutions / min for 10min), and discharging slices of the mixed compounds. The high-performance EVA foam damping material and the method have the main technical advantages that the functionalized graphene and polymer matrixes are excellent in solubility, energy can be effectively dissipated under the effect of friction loss owing to the interface slip between the functionalized graphene and the polymer matrixes, and accordingly noise pollution in automobiles can be effectively reduced.

Description

technical field [0001] The patent of the present invention relates to a preparation method of an automobile sound insulation material, mainly involving graphene as a filler, EPDM as a modified material and a high-performance EVA foam damping material and its preparation method. Background technique [0002] How to reduce the noise inside the car is the goal of the automobile manufacturing industry. When the car is welded, there will be a large gap between the sheet metal and the sheet metal, such as the door, the pillar, etc., which will easily cause noise when the car is running. , it is necessary to seal and block noise; at present, the materials used in automobiles are mainly high-foaming rubber-plastic materials with multi-layer composite structures. Different, in the foaming process, they will restrict each other, affect the foaming ratio, and peel off between layers, so that the gaps cannot be filled, affect the overall sound insulation effect, and reduce product perfo...

AI Technical Summary

Problems solved by technology

Ethylene-vinyl acetate copolymer foaming material has the advantages of light specific gravity, softness, shock absorption, non-toxicity, and chemical resistance, and is widely used in the manufacture of sports shoe soles, luggage linings, thermal insulation materials, and sound insulation materials; as a lightweight The use of materials, EVA foam materials still have defects such as easy deformation, low tear resistance, and insufficient resilience, which limit its use; the development density is low, soft and shock-resistant, and has high resilience and excellent compression A new type of EVA-based composite foam material with permanent deformation properties is of great significance

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