Molding process of highly heat-resistant sound absorbing and insulating materials

摘要

The present invention relates to a method for molding a substantially improved heat-resistant sound absorbing and insulating material, which uses a sound absorbing material containing, based on 100 parts by weight of the sound absorbing material, an amount of about 20-80 parts by weight of a fiber material having a limiting oxygen index (LOI) of about 25% or greater and a heat resistance temperature of about 200° C. or greater and an amount of about 20-80 parts by weight of a thermosetting binder resin having a heat resistance temperature of about 200° C. or greater and is installed on an engine cylinder block and an automotive body panel above a muffler of a vehicle. The method includes: a releasing agent coating step of coating a releasing agent inside a heated die; a heated compression molding step of fixing a shape; and a cold compression step of stabilizing the shape.;The substantially improved heat-resistant sound absorbing and insulating material molded according to the method can reduce the noise inside a vehicle by blocking radiated noise, which is generated from an engine and an exhaust system, from being transferred to the inside of the vehicle through an automotive body panel, can maintain its shape even under a high-temperature environment of about 200° C. or greater generated by the engine and the exhaust system, and can satisfy UL 94V-0 flame retardancy.

主权项

1. A method for molding a heat-resistant sound absorbing and insulating material, comprising:
i) coating a releasing agent inside a heated die; ii) forming a shape of a sound absorbing material by installing a sound absorbing material comprising, based on 100 parts by weight of sound absorbing material, a) an amount of about 20-80 parts by weight of a fiber material having a limiting oxygen index (LOI) of about 25% or greater and a heat resistance temperature of about 200° C. or greater and b) an amount of about 20-80 parts by weight of a thermosetting binder resin having a heat resistance temperature of about 200° C. or greater on the heated die coated with the releasing agent; and iii) stabilizing the shape of the compressed sound absorbing material, wherein the thermosetting binder resin comprises an epoxy resin, an amount of about 1-20 wt % of a curing agent based on the weight of the epoxy resin, an amount of about 1-10 wt % of a catalyst based on the weight of the epoxy resin and an amount of about 10-40 wt % of a flame retardant based on the weight of the epoxy resin.