A kind of polyurethane foam used for refrigerator door overturning beam and its application

A refrigerator door body and overturning beam technology, applied in the field of foamed polyurethane, can solve the problems of high viscosity of polyurethane raw materials, failure to achieve thermal insulation performance, poor filling, etc., achieve high thermal insulation performance, increase surface temperature, and reduce heating frequency.

Active Publication Date: 2020-12-11
CHANGHONG MEILING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the viscosity of general polyurethane raw materials is relatively high, and it is difficult to flow smoothly in the narrow and long refrigerator door hinges with many obstacles, and there is a phenomenon of poor filling, which fails to improve the thermal insulation performance. Good polyurethane foam raw material

Method used

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  • A kind of polyurethane foam used for refrigerator door overturning beam and its application

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Embodiment 1

[0034] In this embodiment, the high-fluidity foamed polyurethane used for the overturning beam of the refrigerator door body has the following raw materials in parts by mass:

[0035] Combined polyether 100 parts,

[0036] 18 parts of foaming agent cyclopentane,

[0037] 161 parts of isocyanate;

[0038] The combined polyether includes polyether polyol, catalyst, water and foam stabilizer, etc. The viscosity is 2500-3000mPa·s under the test condition of 25°C. The lower viscosity is 200-300mPa·s. The combined polyether is provided by BASF Polyurethane Specialty Products (China) Co., Ltd., and the brand name is CH2031 / 151.

[0039] The isocyanate is polymethylene polyphenyl isocyanate, the isocyanate content is 30-32%, and the viscosity at room temperature is 300-450mPa·s;

[0040] In this embodiment, the door body of the refrigerator turns over the beam, and the heat-insulating rigid polyurethane foam in the turning beam is the above-mentioned foamed polyurethane material, ...

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Abstract

Foam polyurethane used for a refrigerator door turning beam and applications thereof are disclosed. Raw materials of the foam polyurethane include, by mass, 100 parts of composite polyether, 15-20 parts of a physical foaming agent and 155-170 parts of isocyanate. The foam polyurethane is adopted as heat-insulating hard polyurethane foam in the refrigerator door turning beam, and the turning beam has good heat insulation performance than common turning beams, thus reducing the risk of condensation at the turning beam. In addition, the hard polyurethane foam has higher strength than EPS foam so that the overall strength of the turning beam is improved, and the turning beam is not liable to bend or deform. The foam polyurethane has high fluidity so that a foaming material can flow in the narrow inside of the turning beam and the turning beam is filled well.

Description

technical field [0001] The invention relates to a polyurethane foam used for a refrigerator door overturning beam and an application thereof, belonging to the field of household appliances. Background technique [0002] With the increasing energy consumption requirements of household refrigerators and the continuous development of refrigerator energy-saving technology, more and more attention has been paid to the insulation performance of the refrigerator door overturn beam. The ordinary polystyrene (hereinafter referred to as EPS) foam flip beam widely used in refrigerators can no longer meet the technical requirements of energy saving, so it is imperative to improve the insulation performance of the refrigerator door body flip beam. [0003] Generally speaking, the thermal conductivity of rigid polyurethane foam is about 20mw / mk, while that of EPS foam is about 40mw / mk. In other words, the thermal conductivity of rigid polyurethane foam is twice that of EPS foam, so the do...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/48C08G18/50C08J9/14C08G101/00
CPCC08G18/482C08G18/5021C08G18/5024C08G18/7664C08J9/141C08J2203/14C08J2205/10C08J2375/08C08G2110/0025C08G2110/005
Inventor 刘鹏江峰蔡训儒
Owner CHANGHONG MEILING CO LTD
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