Composite polyether, polyurethane foam and raw material composition and preparation method of polyurethane foam

Abstract

The invention discloses composite polyether, polyurethane foam and raw material composition and a preparation method of the polyurethane foam. The composite polyether is prepared from, by weight, 30-50 parts of polyether polyol A, 10-20 parts of polyether polyol B, 30-40 parts of polyether polyol C, 5-15 parts of polyether polyol D, 2-3 parts of foam stabilizer, 2-5 parts of catalysts, 12-14 parts of foaming agent and 1.6-1.8 parts of water. The foaming agent is cyclopentane. The polyurethane foam adopts the composite polyether, the environment-friendly property is remarkably improved, the foam heat conductivity coefficient, the molding density and the refrigerator injection dosage are reduced, production cost is lowered, and compression strength and low-temperature size stability are improved.

Description

technical field [0001] The present invention specifically relates to a combined polyether, polyurethane foam and its raw material composition and preparation method. Background technique [0002] Up to now, in the field of refrigerator insulation, polyurethane foam has occupied an absolute dominant position, but most of the traditional polyurethane foam has the defect of depleting the ozone layer, and this defect is mainly caused by the foaming agent of the polyurethane foam. As people's awareness of environmental protection increases, ozone-depleting blowing agents are being phased out. For example, blowing agent CFC-11 has been completely replaced, and its substitute, HCFC-141B, is also facing phase-out. At present, the common polyurethane foaming agents with ozone depletion potential value (referred to as ODP value) of 0 are mainly cyclopentane, HFC-245fa and HFC-365mfc / 227ea, but HFC-245fa and HFC-365mfc / 227ea The global warming potential value (GWP value for short) of ...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of the polyurethane foam ODP and GWP values ​​in the prior art which are relatively high and poor environmental protection, as well as the high thermal conductivity of the foam, high mold density, low compressive strength, and low temperature Due to defects such as poor dimensional stability and large amount of filling in refrigerators, a combination of polyether, polyurethane foam and its raw material composition and preparation method is provided

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