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Premixed polyether polyol, polyurethane raw material composition, foam and preparation method and application of foam

A raw material composition and technology of combining polyether, which is applied in the field of polyurethane, can solve the problems of low low-temperature dimensional stability, high refrigerator filling volume, and high thermal conductivity, and achieve good low-temperature dimensional stability, large space, and low thermal conductivity. Effect

Active Publication Date: 2015-11-11
SHANGHAI DONGDA POLYURETHANE
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the disadvantages of high filling volume, high cost, low dimensional stability at low temperature and high thermal conductivity of the refrigerator when pure cyclopentane is used as the blowing agent in the prior art, and provide A combined polyether, polyurethane raw material composition, foam, preparation method and application that do not exist in the prior art

Method used

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  • Premixed polyether polyol, polyurethane raw material composition, foam and preparation method and application of foam
  • Premixed polyether polyol, polyurethane raw material composition, foam and preparation method and application of foam
  • Premixed polyether polyol, polyurethane raw material composition, foam and preparation method and application of foam

Examples

Experimental program
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Effect test

Embodiment 1-3

[0039] The parts by weight of each component of the raw material composition of polyether and isocyanate in Examples 1-3 and Comparative Example 2 are specifically shown in Table 1.

[0040] Table 1

[0041]

[0042]

[0043] (1) Preparation of combined polyether

[0044] Mix other components except foaming agent and isocyanate uniformly in a stainless steel mixing tank for 45 minutes, then freeze the mixture to 14°C, add the above foaming agent, and continue mixing for 15 minutes.

[0045] (2) Preparation of polyurethane foam

[0046] The combined polyether and isocyanate are reacted at 18° C. according to the mass ratio of 1:1.25, and injected into a mold to obtain a rigid polyurethane foam insulation material for refrigerators.

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Abstract

The invention discloses premixed polyether polyol, a polyurethane raw material composition, foam and a preparation method and application of the foam. The premixed polyether polyol comprises, by mass, 30-50 parts of polyether polyol YD1050, 30-50 parts of polyether polyol SA380, 20-30 parts of polyether polyol SD7100, 2-3 parts of foam stabilizer, 2-3 parts of catalyst, 1.5-2.5 parts of water and 17-19 parts of foaming agent. The foaming agent is a mixture of cyclopentane and HFC-245fa. As the varieties of the premixed polyether polyol are specifically selected, the obtained polyurethane foam material is excellent in performance, the compression strength is higher, the low-temperature dimensional stability is better, and the heat conductivity coefficient is lower. The rigid polyurethane foam can be applied to insulating layers of refrigerators or freezers or refrigerated containers.

Description

technical field [0001] The invention relates to the field of polyurethane, in particular to a preparation method and application of a composite polyether, a polyurethane raw material composition, and a foaming agent. Background technique [0002] Rigid polyurethane foam is a polymer composite material with superior performance. Due to its good dimensional stability at low temperature and low thermal conductivity, it is currently widely used as a thermal insulation material in freezers, refrigerators and containers. [0003] According to the "Montreal Protocol", developed countries and regions such as the United States and Europe have banned the use of hydrochlorofluorocarbon blowing agent HCFC-141b around 2003. The Chinese government’s schedule for reducing the production and use of hydrochlorofluorocarbons is that the production and use of hydrochlorofluorocarbons will be frozen at the level in 2013, and the production and use of hydrochlorofluorocarbons will be completely ...

Claims

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Application Information

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IPC IPC(8): C08L71/00C08J9/14C08G18/48C08G18/79C08L75/08C08G101/00
Inventor 李明信延垒王伟汤道玲
Owner SHANGHAI DONGDA POLYURETHANE
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