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Polyurethane rigid foam and preparation method thereof

A technology of rigid foam and polyurethane, which is applied in the field of polyurethane rigid foam and its preparation, can solve the problems of high thermal conductivity of foam and poor thermal insulation performance of foam, and achieve the effects of low thermal conductivity, improved thermal insulation performance and small molecular weight

Active Publication Date: 2012-05-09
万华化学(佛山)容威聚氨酯有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using HC and methyl formate as foaming agent, the prepared foam has high thermal conductivity and poor thermal insulation performance

Method used

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  • Polyurethane rigid foam and preparation method thereof
  • Polyurethane rigid foam and preparation method thereof

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Embodiment Construction

[0034] Embodiments of the present invention are further described below in conjunction with examples. However, the present invention is not limited to the listed embodiments, but also includes any other known changes within the scope of the claims of the present invention.

[0035] Preparation steps of rigid polyurethane foam: Mix polyether polyols A-E, surfactants, composite catalysts and water according to the ratios in Table 1 and 2 to obtain a polyether polyol mixture, and freeze in a 10°C freezer. Then mix evenly with the blowing agent frozen to 10°C, and finally mix the polyether polyol mixture containing the blowing agent and isocyanate through a high-pressure foaming machine to prepare polyurethane rigid foam. The operating conditions of the high-pressure foaming machine are: material temperature 19°C, operating pressure 125bar.

[0036] The polyether polyol used in the present invention is:

[0037] Polyether polyol A: prepared by addition reaction of sucrose as the...

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Abstract

The invention discloses polyurethane rigid foam and a preparation method thereof, wherein foam plastic is prepared from the following raw materials by a high pressure foaming machine in parts by weight: 100 parts of combined polyether, 1.5-3 parts of surfactant, 1.5-3 parts of complex catalyst, 1-3 parts of water, 16-26 parts of mixed foaming agent and 140-170 parts of polymerized isocyanate, wherein the mixed foaming agent consists of methyl formate and 1,1,1,3,3-pentafluoropropane (HFC-245fa). The prepared polyurethane foam has low heat conductivity, good dimensional stability and proper cost.

Description

technical field [0001] The invention relates to a rigid polyurethane foam and a preparation method thereof, in particular to a rigid polyurethane foam prepared with an environmentally friendly foaming agent and a preparation method thereof. The foam is used as insulation material for home appliances such as refrigerators and freezers. Background technique [0002] Hydrochlorofluorocarbon blowing agents currently used for polyurethane rigid foam have a detrimental effect on the ozone layer. HCFC-141b is the most widely used hydrochlorofluorocarbon blowing agent. China will ban the use of HCFC-141b in 2020. Currently, it can The blowing agents used to replace HCFC-141b and have no effect on the ozone layer include HC hydrocarbons, HFCs and full water foaming, among which the most commonly used HC blowing agents are cyclopentane and isopentane or a mixture of the two etc. Commonly used HFCs include 1,1,1,2-tetrafluoroethane (HFC-134a), HFC-245fa, 1,1,1,3,3-pentafluorobutane (H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/79C08G18/76C08G18/48C08J9/14
Inventor 朱霞林王林华卫琦丁建生
Owner 万华化学(佛山)容威聚氨酯有限公司
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