Polyurethane foam

Abstract

Provided is a polyurethane foam which has excellent heat resistance and the like. This polyurethane foam is obtained from a material that contains a polyol and a polyisocyanate. The polyol contains a polyester polyol, and the polyisocyanate contains a diphenylmethane diisocyanate-based isocyanate. It is preferable that the polyester polyol has one or more side chains, each of which is composed of an alkyl group. This polyurethane foam is able to be used as a sound insulation material for vehicles.

Description

technical field [0001] The present invention relates to a polyurethane foam, in particular, it relates to a polyurethane foam having excellent heat resistance, and further relates to a polyurethane foam having good heat resistance and moist heat resistance and excellent flame retardancy. Background technique [0002] Polyurethane foam has also been used as a soundproof material, but common polyurethane foam, especially ether-based polyurethane foam, is easily oxidized and deteriorated and has poor heat resistance, so it is not suitable in some places of use. For example, in vehicles, sound insulating materials are used in various places in order to suppress noise, but heat resistance is required when used near the engine and the like. [0003] As polyurethane foams having increased heat resistance and flame retardancy among polyurethane foams, there are asphalt-impregnated polyurethane foams (Patent Document 1), isocyanurate foams (Patent Document 2), and polycarbonate-based...

AI Technical Summary

Problems solved by technology

[0007] However, bitumen-impregnated urethane foam becomes heavy and flammable due to the bitumen used for impregnation, and has a problem of blocking at high temperatures

[0008] On the other hand, since the isocyanurate foam contains a large amount of isocyanurate during the blending of the polyurethane foam, the foam is brittle and the hardness of the foam increases, so that the isocyanurate foam is not suitable for use as Soundproofing materials for vehicles, etc.

[0009] In addition, regarding polycarbonate-based polyurethane foam, since the viscosity of its raw material is extremely high, there are problems of troublesome handling during manufacture, poor low-temperature characteristics, and high raw material cost

[0010] Incidentally, polyurethane foam using a melamine flame retardant as a flame retardant has been proposed, but there is a problem that the effect of improving flame retardancy is not very high even when the added amount is increased

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