Hard polyurethane foam

A technology of rigid polyurethane and foam, applied in the field of rigid polyurethane foam, can solve the problems of inability to achieve the expected thermal insulation effect and high thermal conductivity, and achieve the effects of high dimensional stability, low thermal conductivity and good mutual solubility

Active Publication Date: 2016-05-25
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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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 to the combined polyol according to the proportion in the table, mix evenly, then add the physical foaming agent according to the proportion in the table, continue to mix evenly, and configure into 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, injected into a closed mold (1200×400×70mm), and the overfill coefficient is 112% to prepare rigid polyurethane foam.

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Abstract

The invention relates to a hard polyurethane foam. The hard polyurethane foam is composed of a component A and a component B at a weight ratio of 1:0.7-1.2. The component A comprises, by weight, 100 parts of a compound polyhydric alcohol containing phenylenediamine polyether glycol and polyester ether polyhydric alcohol, 10 to 50 parts of a physical foaming agent containing trans-1,1,1,4,4,4-hexafluoro-2-butene, 1 to 4 parts of a catalyst, 1 to 5 parts of a surfactant, and 0.5 to 3.0 parts of water; and the component B is polymethylene polyphenyl isocyanate. The foams of the hard polyurethane foam are fine and uniform; heat conductivity coefficient is low; comprehensive properties are excellent; and K value<=19.0mW / (m.K) at 24 DEG C, and K value<=17.0mW / (m.K) at 0 DEG C.

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 material, and thermal conductivity is an important physical parameter to measure its excellent thermal insulation performance. Relevant theoretical studies show 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 accounting for about 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 foaming agent. [0003] At present, hydrofluorocarbons (HFCs) represen...

Claims

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Application Information

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Patent Type & Authority Applications(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
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