METHOD FOR MOULDING HIGHLY HEAT-RESISTANT SOUND ABSORBING AND INSULATING MATERIAL Russian patent published in 2018 - IPC B29C33/58 B29C43/26 C08J5/06 G10K11/168 C08L63/00 

FIELD: moulding.

SUBSTANCE: invention relates to a method for moulding a highly heat-resistant sound absorbing and insulating material, as well as to a method for reducing the noise of a noise generating device, in which said sound absorbing and insulating material is placed. Moulding of sound absorbing material includes a releasing agent coating step of coating a releasing agent inside a hot die, a hot compression moulding step of fixing a shape and a cold compression step of stabilising the shape. Sound absorbing material contains 20–80 parts by weight of fibre material, having a limiting oxygen index (LOI) of 25 % or greater and a heat resistance temperature of 200 °C or greater and 20–80 parts by weight of a thermosetting binder resin having a heat resistance temperature of 200 °C or greater. Sound absorbing material is installed on an engine cylinder block and an automotive body panel above a muffler of a vehicle.

EFFECT: highly heat-resistant sound absorbing and insulating material moulded in accordance with the invention 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 °C or greater generated by the engine and the exhaust system, and can satisfy UL 94V-0 flame retardancy.

17 cl, 6 dwg, 22 ex, 9 tbl