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Freezer foaming layer

A foamed layer and freezer technology, applied in the field of freezer manufacturing, can solve the problems of high cost of foaming system, inability to meet energy conservation and environmental protection and excellent performance, insufficient foam fluidity, etc. Affected, low foam density effects

Inactive Publication Date: 2020-04-28
CHANGHONG MEILING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a foaming layer of a refrigerator, which is prepared by reacting high-viscosity black material, polyether and foaming agent, and is prepared by using higher functional isocyanate and diphenylmethane diisocyanate High-viscosity black material; improve the fluidity of the foaming liquid by combining polyether to make up for the lack of foam fluidity caused by the use of high-viscosity black material; solve the problem of high cost of the existing foaming system, and can not meet the requirements of energy saving and environmental protection excellent performance issues

Method used

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Embodiment 1

[0019] The invention relates to a foaming layer of a freezer, which is prepared by reacting a high-viscosity black material, a combination polyether and a foaming agent;

[0020] The viscosity of the high-viscosity black material at 25°C is 300-700mPa·s; the high-viscosity black material is a mixture of isocyanate with higher functionality and diphenylmethane diisocyanate.

[0021] Among them, the viscosity value of the high-viscosity black material is 350-550 mPa·s.

[0022] Among them, the average viscosity functionality of high-viscosity black material is 2.8-3.0;

[0023] The commercial grades of high-viscosity black materials can be selected as PM-400, PM-4010, and M50.

[0024] Wherein, the foaming agent is one or more of pentane, butane, 1,1,1,3,3-pentafluoropropane or trans-1-chloro-3,3,3-trifluoropropene.

[0025] Wherein, pentane is one or both of cyclopentane and isopentane.

[0026] Wherein, butane is one or both of n-butane and isobutane.

Embodiment 2

[0028] In a specific embodiment, taking the BCD-278 freezer as an example, according to the different components of cycloisopentane, 245fa, LBA and R600a blowing agent, develop different formulations of white material A, white material B, white material C, and white material D , corresponding to comparative example, embodiment 1, embodiment 2 and embodiment 3 respectively, process parameter and performance are shown in Table 1:

[0029]

[0030]

[0031] Table 1

[0032] As can be seen from the above table, compared with the comparative example in Example 1, Example 2 and Example 3, the amount of foaming material in Example 1 is reduced by 4.7%, the curing time is reduced by 20s, the thermal conductivity of the foam is slightly reduced, and the compressive strength is Basically the same; the amount of foaming material in Example 2 is reduced by 9.4%, the curing time is reduced by 50s, the thermal conductivity of the foam is basically the same, and the compressive strengt...

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Abstract

The invention discloses a freezer foaming layer, and relates to the technical field of freezer manufacturing. The freezer foaming layer is prepared from a high-viscosity black material, combined polyether and a foaming agent through a reaction. The viscosity of the high-viscosity black material at 25 DEG C is 300 to 700 mPa.s; wherein the high-viscosity black material is a mixture consisting of isocyanate with higher functionality and diphenylmethane diisocyanate. The flowability of the foaming liquid is improved through the combined polyether, so that the problem of insufficient foam flowability caused by the use of a high-viscosity black material is solved; the prepared polyurethane foam has the effects of zero ODP value and low GWP value; besides, the prepared foam is low in foaming density, the using amount of foaming materials is reduced, the foaming cost is reduced, the heat conductivity coefficient of the foam is low, and it is guaranteed that the heat preservation performance of the foam is not affected.

Description

technical field [0001] The invention belongs to the technical field of freezer manufacture, and in particular relates to a foam layer of a freezer. Background technique [0002] The foaming of refrigerators and freezers generally refers to the foaming of rigid polyurethane. The white material (combined polyether) and black material (isocyanate) containing foaming agent are mixed under high pressure by the mixing head of the foaming machine, and injected into the box or door space. The reaction in the cavity forms a polyurethane foam layer; and the foam layer provides insulation and support for refrigerators and freezers, so the quality and performance of the foam determines the performance of the refrigerator or freezer. [0003] Due to the complex structure of refrigerators and freezers, the thickness of the foam layer is uneven, and there are various blocking parts such as pipes, wire harnesses, and air ducts inside, the fluidity of the foaming liquid will be affected; in ...

Claims

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Application Information

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IPC IPC(8): C08G18/48C08J9/14C08L75/08C08G101/00
CPCC08G18/48C08J9/141C08J9/144C08J9/146C08J2203/14C08J2203/142C08J2203/162C08J2375/08C08G2110/0025
Inventor 王贞平韩爱林冯翘楚
Owner CHANGHONG MEILING CO LTD
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