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A kind of refrigerator polyurethane insulation layer and preparation method thereof

A polyurethane and insulation layer technology, applied in the field of polyurethane foaming, can solve the problems of low foaming agent addition ratio, difficulty in dissolving foaming agent, and insufficient premixing, so as to improve foaming quality, increase foam strength, and reduce The effect of foaming on the overall cost

Active Publication Date: 2022-02-25
CHANGHONG MEILING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of premixing and mixing white materials, it is inevitable that some foaming agents are added in a low proportion or the foaming agent is difficult to dissolve into pure white materials, which will result in uneven premixing and poor foaming stability, which will affect foaming. bubble quality

Method used

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  • A kind of refrigerator polyurethane insulation layer and preparation method thereof
  • A kind of refrigerator polyurethane insulation layer and preparation method thereof
  • A kind of refrigerator polyurethane insulation layer and preparation method thereof

Examples

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Embodiment 1

[0023] A method for preparing a refrigerator polyurethane insulation layer of the present invention comprises the following steps:

[0024] Step 1: Mix 100 parts of white material, 10 parts of pentane, and 6 parts of HFO-1233ZD in a white material premixing tank according to the weight ratio at a material temperature of 15-25°C to obtain a mixed white material;

[0025] Step 2: Put 145 parts of high-functional polymethylene polyphenylisocyanate with a viscosity of 350-500 (25°C) / mPa·s in the black material premixing tank under the condition of material temperature of 15-25°C Stir evenly to obtain the prepared black material;

[0026] Step 3: At a material temperature of 15-25°C, inject 2.5 parts of R600a into the foaming agent premix tank through high-pressure liquefaction to obtain liquid R600a;

[0027] Step 4: Put the mixed white material, preparatory black material and liquid R600a into the injection gun head, mix well and inject it into the box or door mold to be foamed ...

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Abstract

The invention discloses a refrigerator polyurethane insulation layer and a preparation method thereof, and relates to the technical field of polyurethane foaming. The polyurethane insulation layer of the present invention comprises by weight: 100 parts of white material; 8-15 parts of pentane; 1-3 parts of R600a; 5-7 parts of HFO-1233ZD or HFC-245fa; 135-150 parts of black material. The present invention achieves the effect of improving foaming efficiency and foam strength by adding R600a; by selecting HFO-1233ZD or HFC-245fa, due to the low thermal conductivity of the weather, the thermal insulation performance of the foam can be improved; and the black material with high functionality is selected , increase the degree of cross-linking, achieve the effect of increasing the foam strength, and improve the foam quality as a whole; at the same time, reduce the total injection amount of polyurethane raw materials, thereby effectively reducing the overall cost of foaming; at the same time, the mixed white material, R600a Three-component mixed injection foaming with black material to achieve dynamic mixing, avoiding the situation that the mixing ratio of R600a is very low and it is difficult to mix uniformly in the static premixing tank, resulting in uneven mixing and affecting the foaming quality.

Description

technical field [0001] The invention belongs to the technical field of polyurethane foaming, and in particular relates to a refrigerator polyurethane insulation layer and a preparation method thereof. Background technique [0002] Refrigerators and freezers are indispensable electrical appliances in the family. The very important process in the production of refrigerators and freezers is polyurethane foaming. Both the refrigerator box and the door body need to be foamed after polyurethane foaming to achieve heat preservation and support. Therefore, the quality of refrigerator foaming is extremely important. At the same time, the foaming technology of refrigerators is constantly developing. At present, the most mainstream foaming system of domestic first-line brands is multi-component mixing foaming, that is, mixing various types of foaming agents into white materials in different proportions ( Form a mixed material (hereinafter referred to as "mixed white material") in a mix...

Claims

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Application Information

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IPC IPC(8): C08J9/14C08L75/04
CPCC08J9/141C08J9/146C08J2203/202C08J2375/04
Inventor 叶小三刘鹏江峰
Owner CHANGHONG MEILING CO LTD
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