Hyundai Motor Company

Kia Motors Corporation

Kia Motor Corporation

Chi Man Cho

Keun Young Kim

Won Jin Seo

Su Nam Lee

Ki Dong Lee

Jong Beom Seo

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&#xb0; 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&#xb0; 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&#xb0; C. or greater generated by the engine and the exhaust system, and can satisfy UL 94V-0 flame retardancy.

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

The present invention relates to a method for molding a highly heat-resistant sound absorbing and insulating material, which uses a sound absorbing material containing 20-80 parts by weight of a fiber material having a limiting oxygen index (LOI) of 25% or greater and a heat resistance temperature of 200&#xb0; C. or greater and 20-80 parts by weight of a thermosetting binder resin having a heat resistance temperature of 200&#xb0; C. or greater and is installed on an engine cylinder block and an automotive body panel above a muffler of a vehicle. More specifically, the method includes a releasing agent coating step of coating a releasing agent inside a hot die, a hot compression molding step of fixing a shape, and a cold compression step of stabilizing the shape. The highly 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 200&#xb0; C. or greater generated by the engine and the exhaust system, and can satisfy UL 94V-0 flame retardancy.

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Yongin-si, South Korea

Chi Man Cho