Hard polyurethane foam plastic specially adapted for pipe insulation layer

Abstract

The invention discloses a hard polyurethane foam plastic in the insulating pipe layer, which is characterized by the following: adopting plural polyether, catalyst, foam stabilizer, distill water and foamer to form component A; using polymethylene polyphenyl polyisocyanates as raw material B; selecting triethanolamine, N, N-dimethyl cyclohexylamine, 2, 4, 6-tri (dimethylamine methyl) phenol and potassium oleate as catalyst; blending component A and B evenly; stirring; pouring the mass into mould; foaming; solidifying; obtaining the product with stable size for SY / T0415-96 standard.

Description

technical field [0001] The invention relates to a rigid polyurethane foam, in particular to a rigid polyurethane foam which is especially suitable for pipe insulation. Background technique [0002] Traditional rigid polyurethane foams use CFCs (chlorofluorocarbons) as blowing agents, mainly CFC-11 blowing agents. It has been confirmed that CFCs have extremely serious damage to the ozone layer. China will implement them on July 1, 2007 CFC-11 has been completely phased out recently. Therefore, the replacement of CFC-11 blowing agent is a research hotspot in the field of polyurethane rigid foam. At present, the blowing agents developed to replace HCFCs mainly include water and liquid CO 2 , pentanes and HFCs (hydrofluorocarbons) series, and HCFC-141b (molecular formula CH 3 CFCl 2 , the chemical name is dichlorofluoroethane). The thermal conductivity of all water-blown foam is large, because CO 2 Its own thermal conductivity is relatively large, and the hard foam made by...

AI Technical Summary

Problems solved by technology

The thermal conductivity of all water-blown foam is large, because CO 2 Its own thermal conductivity is relatively large, and the hard foam made by using it has poor thermal insulation, and the foam is easy to become crisp and brittle; liquid CO 2 The blowing agent needs to be contained in a high-pressure container; pentane is flammable and explosive, and the HFCs series mainly include HFC-245fa and HFC-365mfc. They did not start industrial production in a few developed countries until 2003, and in China, for their The research is still in its infancy, and the price is much higher than that of other blowing agents, which is economically unaffordable for general manufacturers

Therefore, they replace CFC-11 as the blowing agent of the polyurethane foam insulation layer of oil pipelines. Due to the limitations of various conditions, it is difficult to large-scale industrialization in my country at present.