Study on polyurethane rigid foam system for flexible insulating pipe
By selecting a suitable long-chain polyether polyol,all-water-blown flexible polyurethane rigid foam was prepared by one-step method and applied to prefabricated directly buried insulating composite plastic pipes.The mechanical performance and thermal conductivity coefficient of the flexible polyurethane rigid foam could meet the requirements of GB/T 29047-2021 Prefabricated directly buried insulating pipes and fittings with polyurethane foamed-plastics and high density polyethylene casting pipes.
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