A kind of hfc-245eb type combined polyether for spraying polyurethane plastics and preparation method thereof

Abstract

The invention discloses HFC-245eb type compound polyether for spraying polyurethane plastic and a preparing method of the HFC-245eb type compound polyether. The HFC-245eb type compound polyether for spraying polyurethane plastic comprises, by mass, 25-170 parts of polyether polyol, 2.2-17 parts of catalyst, 0-5 parts of foam stabilizer, 10-35 parts of additive flame retardant, 0-2 parts of water and 10-80 parts of foaming agent HFC-245eb. According to the HFC-245eb type compound polyether for spraying polyurethane plastic, the HFC-245eb is used as the foaming agent, and the prepared spraying polyurethane plastic has the good heat preservation performance, mechanical strength and dimension stability; hard polyurethane foams extinguishes by itself after leaving fire 0-3 s, safety, environmental friendliness, energy conservation and reliability are achieved, and the requirements for energy conservation, emission reduction, safety and environmental friendliness of the state are met.

Description

technical field [0001] The invention relates to an HFC-245eb type combined polyether used for spraying polyurethane plastics and a preparation method thereof, belonging to the field of polyurethane foam plastics. Background technique [0002] Rigid polyurethane foam is currently the best thermal insulation and energy-saving material in the world. It is widely used in refrigerators, freezers, construction, transportation, petrochemicals, aviation and military as thermal insulation materials and structural performance materials. However, due to environmental pressure, the use of existing blowing agents has been limited: according to the Montreal Protocol and its subsequent amendments, the United States has banned the use of HCFC-141b on January 1, 2003, and Europe has also banned the use of HCFC-141b in 2002-2004. During the year, the use of HCFC-141b and other HCFC-like characteristics was stopped; in early 2009, the Environmental Protection Foreign Cooperation Center of the ...

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Problems solved by technology

However, due to the pressure of the environment, the use of existing blowing agents has been restricted: according to the Montreal Stop the use of HCFC-141b and other HCFC-like properties during the year; in early 2009, the Environmental Protection Foreign Cooperation Center of the Ministry of Environmental Protection of China and the China Plastics Processing Industry Association launched a comprehensive investigation on the consumption of polyurethane rigid foam R141b in China. On this basis, environmental protection The Environmental Protection Foreign Cooperation Center of the Ministry of Foreign Affairs commissioned the School of the Environment of Peking University and the China Plastics Processing Industry Association to compile the "HCFCs Elimination Plan for China's Polyurethane Foam Industry", which was approved in July 2011. The amount of R141b eliminated is 14,685 tons; the use of R141b in the foam industry will be completely banned by 2030

[0003] At present, although hydrocarbon foaming agents and all-water foaming agents are also used, hydrocarbon foaming agents cannot be used in direct on-site construction of sprayed polyurethane plastics because of their inflammability and explosion; The shortcomings of high coefficient, relatively poor dimensional stability, and high requirements for raw materials limit its popularization and application in sprayed polyurethane plastics.

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