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A rigid polyurethane foam

A rigid polyurethane and foam technology, applied in the field of rigid polyurethane foam, can solve the problems of failing to achieve the expected thermal insulation effect and high thermal conductivity, and achieve the effects of high dimensional stability, low thermal conductivity and excellent mechanical properties

Active Publication Date: 2018-05-11
NANJING HONGBAOLI POLYURETHANE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual application, it was found that foam has a high thermal conductivity at low temperatures, and it cannot achieve the expected thermal insulation effect when applied to white goods such as refrigerators, cold storage, and freezers.

Method used

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  • A rigid polyurethane foam
  • A rigid polyurethane foam
  • A rigid polyurethane foam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0052] Table 1

[0053]

[0054] Add the catalyst, surfactant, and water into the combination polyol according to the ratio in the table, mix evenly, then add the physical foaming agent according to the ratio in the table, continue to mix evenly, and configure component A. Component A and component B are reacted by mixing the component A and component B according to the weight ratio in the formula through the head of a high-pressure machine gun, and injected into a closed mold (1200×400×70mm) to obtain a rigid polyurethane foam.

Embodiment 6-10 and comparative example 1

[0056] Table 2

[0057]

[0058] Add the catalyst, surfactant, and water into the combination polyol according to the ratio in the table, mix evenly, then add the physical foaming agent according to the ratio in the table, continue to mix evenly, and configure component A. Component A and component B were mixed and reacted by a high-pressure machine gun head according to the weight ratio in the table, and injected into a closed mold (1200×400×70mm), with an overfill coefficient of 112%, to obtain a rigid polyurethane foam.

Embodiment 11-12 and comparative example 2-6

[0060] table 3

[0061]

[0062]Add the catalyst, surfactant, and water into the combination polyol according to the ratio in the table, mix evenly, then add the physical foaming agent according to the ratio in the table, continue to mix evenly, and configure component A. The above-mentioned component A and the above-mentioned component B are mixed and reacted by a high-pressure machine gun head according to the weight ratio in the formula, and injected into a closed mold (1200 * 400 * 70mm), the overfill coefficient is 112%, and a rigid polyurethane foam is obtained.

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Abstract

The invention relates to a rigid polyurethane foam, which is composed of component A and component B, the weight ratio of component A to component B is 1:0.7-1.2, and the component A is calculated in parts by weight, including: 100 Parts of combined polyol: containing phenylenediamine polyether polyol and polyester ether polyol; 10-50 parts of physical blowing agent: containing trans-1,1,1,4,4,4-hexafluoro-2-butyl ene; 1-4 parts of catalyst; 1-5 parts of surfactant; 0.5-3.0 parts of water; the component B is polymethylene polyphenyl isocyanate. The rigid polyurethane foam invented by the method has fine and uniform cells, small thermal conductivity, and excellent comprehensive performance. K).

Description

technical field [0001] The invention relates to a rigid polyurethane foam, in particular to a rigid polyurethane foam containing trans-1,1,1,4,4,4-hexafluoro-2-butene. Background technique [0002] Rigid polyurethane foam is mainly used as thermal insulation and cold insulation materials, and its thermal conductivity is an important physical parameter to measure its excellent thermal insulation performance. Relevant theoretical studies have shown that the heat conduction of foam materials mainly depends on three ways: gas phase conduction in the cells, solid phase conduction in the foam body, and heat radiation. When the temperature is low, the thermal radiation heat transfer is very small and can be ignored, and the gas that accounts for 90% of the foam volume has the greatest influence on the thermal conductivity of the foam, that is, the thermal conductivity of the foam mainly depends on the type and amount of blowing agent. [0003] At present, hydrofluorocarbons (HFCs)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/14C08G18/76C08G18/48C08G18/50C08G18/42C08G18/24C08G18/20C08G18/22C08L75/08
Inventor 邢益辉熊丽媛王金祥陶学飞吴一鸣
Owner NANJING HONGBAOLI POLYURETHANE