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Heat preservation rigid polyurethane foam and preparation method thereof

A technology of rigid polyurethane and foam, applied in the field of polyurethane, to meet the needs of diversified foaming, high compressive strength, and small cell size

Active Publication Date: 2019-08-09
海斯福(深圳)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the GWP of PF5056 is as high as 9000, which is not an environmentally friendly foaming additive

Method used

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  • Heat preservation rigid polyurethane foam and preparation method thereof
  • Heat preservation rigid polyurethane foam and preparation method thereof
  • Heat preservation rigid polyurethane foam and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Combine 100kg polyether (functional group degree is 4, viscosity at 25°C is 4000mPa·s), 15kg foaming agent cyclopentane CP, 2.6kg foaming aid (which contains 2.34kg perfluoro-E-(4- Methylpent-2-ene) and 0.26kg perfluoro-Z-(4-methylpent-2-ene)) into the static mixer; the above-mentioned materials after static mixing enter the premix tank, N 2 0.5 atmospheric pressure in the atmosphere, emulsified for 30 minutes under 1500 rev / min rotating speed to obtain the emulsified white material; the above emulsified white material and 150kg polymethylene polyphenyl isocyanate (the average functional group degree is 2.7-2.8, the viscosity at 25 ° C 400-420mPa·s) are mixed by a high-pressure foaming machine to obtain a foaming system, which is quickly injected into a foaming mold.

[0034] The milky time of the foam system is 3s, the drawing time is 46s, the non-sticky time is 180s, and the free foaming density is 23kg / m 3 , the liquidity index is 2.9497.

[0035] The mold temperat...

Embodiment 2

[0037] Combine 100kg polyether (functional group degree is 8, viscosity at 25°C is 6000mPa·s), 30kg foaming agent HFC-245fa, 2.6kg foaming aid (which contains 1.6kg perfluoro-E-(4-methyl pent-2-ene) and 1kg1,1,1,2,3,4,4,5,5,5-decafluoro-3-methoxy-2-trifluoromethylpentane) into static mixing In the device; the above-mentioned materials after static mixing enter the premix tank, N 2 1 atmospheric pressure in the atmosphere, emulsified for 10 minutes at a speed of 4000 rpm to obtain an emulsified white material; the above-mentioned emulsified white material and 140kg polymethylene polyphenyl isocyanate (average functional group degree is 3.0-3.2, viscosity at 25°C 780-800mPa·s) are mixed by a high-pressure foaming machine to obtain a foaming system, which is quickly injected into a foaming mold.

[0038]The milky time of the foaming system is 3s, the drawing time is 40s, the non-sticky time is 100s, and the free foaming density is 28kg / m 3 , the liquidity index was 2.9431.

[...

Embodiment 3

[0041] Combine 100kg polyether (functional group degree is 6, viscosity at 25°C is 5100mPa·s), 30kg foaming agent HCFC-141b and 2.6kg foaming aid (which contains 2.1kg perfluoro-E-(4-methanol) pent-2-ene), 0.3kg perfluoro-Z-(4-methylpent-2-ene) and 0.2kg1,1,1,2,2,3,3,4,4,4-nonafluoro -4-ethoxybutane) into the static mixer; the above-mentioned materials after static mixing enter the premix tank, N 2 At 3 atmospheric pressures in the atmosphere, emulsify for 120 minutes at 1000 rpm to obtain emulsified white material; mix the above emulsified white material with 150kg polymethylene polyphenyl isocyanate (the average functional group degree is 3.0-3.1, the viscosity at 25°C 580-610mPa·s) are mixed by a high-pressure foaming machine to obtain a foaming system, which is quickly injected into a foaming mold.

[0042] The milky time of the foaming system is 10s, the drawing time is 90s, the non-sticky time is 200s, and the free foaming density is 20kg / m 3 , the liquidity index was ...

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Abstract

The invention relates to a heat preservation rigid polyurethane foam and a preparation method thereof. The heat preservation rigid polyurethane foam is prepared from the following raw materials by weight: 100 parts of combined polyether; 10-30 parts of a foaming agent; 1-2.6 parts of a foaming assistant; and 115-150 parts of isocyanate. Specifically, the foaming agent is one of 1, 1-dichloro-1-fluoroethane, 1-chloro-3, 3, 3-trifluoropropene, 1, 1, 1, 3, 3,-pentafluoropropane, 1, 1, 1, 4, 4, 4-hexafluoropropylene or cyclopentane; the foaming assistant is one of or a mixture of perfluoroolefineand hydrofluoroether, and the perfluoroolefine and hydrofluoroether are in a weight ratio of 100:0-100; the combined polyether is high functionality polyether; and the isocyanate is polymethylene polyphenyl isocyanate. The heat preservation rigid polyurethane foam has the characteristics of high compression strength, small cell size and low thermal conductivity, and can generate obvious energy saving and consumption reduction effects.

Description

technical field [0001] The invention belongs to the technical field of polyurethane, and in particular relates to a thermal insulation rigid polyurethane foam and a preparation method thereof. Background technique [0002] Polyurethane rigid foam is made by reacting and foaming rigid polyether polyol (combined polyether, also known as white material) and polyisocyanate (also known as black material). As a thermal insulation material, polyurethane rigid foam has the characteristics of extremely low thermal conductivity, high specific mechanical properties and low density, and is widely used in refrigerators, cold storage, solar energy, thermal pipelines, construction and other fields. [0003] Polyurethane physical foaming agents do not undergo chemical reactions during the foaming process, are inert and miscible with polyurethane substrates, and mainly include low-boiling point chlorofluorocarbons (CFCs), hydrofluorocarbons (HFCs), hydrochlorofluorocarbons (HCFCs) and alkane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/48C08J9/14C08K5/02C08K5/06C08G101/00
CPCC08G18/48C08J9/0019C08J9/0023C08J9/141C08J9/144C08J9/146C08J2203/14C08J2203/142C08J2375/08C08K5/02C08K5/06C08G2110/0025
Inventor 米欣肖强刘星
Owner 海斯福(深圳)科技有限公司
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