Freezer polyurethane foaming layer and preparation method thereof

Abstract

The invention discloses a freezer polyurethane foaming layer and a preparation method thereof, which relate to the technical field of polyurethane. The polyurethane foaming layer is prepared from a high-viscosity black material, combined polyether and a mixed foaming agent through a reaction. The polyurethane foaming layer is prepared from the following components in parts by weight: 127-150 partsof high-viscosity black material, 100 parts of combined polyether and 16-20 parts of mixed foaming agent. The polyurethane foaming layer is prepared by reacting the high-viscosity black material, thecombined polyether and the mixed foaming agent; mixed foaming is formed by a high-boiling-point pentane foaming agent, a medium-boiling-point 1, 1, 3, 3-pentafluoropropane or trans-1-chloro-3, 3, 3-trifluoropropene foaming agent and low-boiling-point 1, 1-difluoroethane; the prepared polyurethane foaming layer has a zero ODP value and a low GWP value, the prepared foam has the advantages of beinghigh in strength, good in fluidity and low in heat coefficient, and the use amount of foaming raw materials and the foaming cost can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of polyurethane, in particular to a polyurethane foam layer of a freezer and a preparation method thereof. Background technique [0002] Due to its excellent thermal insulation performance and load-bearing strength, polyurethane foam is widely used in household appliances, building panels, pipeline refrigeration and thermal insulation and other industries. Its thermal conductivity and foaming density are important parameters to measure foam performance. Low thermal coefficient foam is an important index to measure the excellent thermal insulation performance of foam, while lower foam density reflects that foam has lower foaming cost. [0003] In the field of home appliances, the structure of refrigerators and freezers is relatively complicated. In order to ensure the foaming filling effect and foaming quality, the black material used generally has a viscosity of about 200mPa·s. The foaming agent used is main...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a polyurethane foam layer for a freezer and a preparation method thereof. The polyurethane foam layer is prepared by reacting a high-viscosity black material, a combined polyether and a mixed foaming agent; the polyurethane foam is flowed using a combined polyether performance improvement; and utilize high-boiling pentane blowing agents and medium-boiling 1,1,1,3,3-pentafluoropropane or trans-1-chloro-3,3,3-trifluoropropene blowing agents and and 1,1-difluoroethane with low boiling point is mixed and foamed; the polyurethane foam layer prepared by this application has zero ODP value and low GWP value, and the worthy foam has the advantages of high strength, good fluidity, and low thermal coefficient , which can effectively reduce the amount of foaming raw materials and foaming cost; solve the problems of high foaming cost of the existing polyurethane foam layer and high thermal conductivity foaming system

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