Special polyurethane foam pipe insulation material

l Review as insulation material, polyurethane foam for its very low thermal conductivity and ease of molding process has an irreplaceable role in many aspects, has great significance in terms of energy savings. In the west, the northern region of China, a large number of delivery channels, such as oil pipelines, central heating pipes, water pipes and other needs insulation, most of which have been adopted or are pending polyurethane insulation materials. Polyurethane material for pipe insulation, depending on molding methods are generally divided into preformed, cast-molding and spot spraying forming three; according to the application when the transmission medium temperature can be divided into common type and temperature type (long-term temperature above 150 ℃ ) two categories. l chemical composition and properties of polyether respect for pipe insulation material is usually a combination of polyether, foam stabilizers, catalysts, blowing agents, flame retardants and other components of the composition, according to the blowing agent can be divided into high-fluorine type freon 141b type, fluorine type all water several major types. Polyether combination of materials usually pale yellow or reddish brown transparent viscous liquid, no matter coagulum and dilute thick and uneven, without mechanical impurities. l reference parameters prefabricated shell small effective material feed large pipes Cream time s ≥20 10 ~ 25 20 ~ 40 Gel time s 70 ~ 120 60 ~ 90 100 ~ 150 Curing time min ≤5 ≤5 10 bulk density kg / m3 35 ~ 50 40 ~ 60 60 ~ 80 NOTE: According to the site to different situations and requirements more adjustable parameters. l reference performance compressive strength (10%): ≥140kpa Water absorption: ≤3% dimensional stability (70 ℃, 48h): ΔV≤ 2% thermal conductivity: ≤0.023w / mk l packaging, storage and transportation of special dry and clean galvanized iron drum, sealed storage in a dry, cool, well-ventilated place, water, sun, heat; optimum storage temperature: 15 ~ 25 ℃. l Caution ① foaming use the best control temperature in the proper range to ensure that the system has the appropriate response performance and mobility; ② foam should be strictly determined proportion of white material with black material in accordance with instructions requirements to ensure that all the basic properties of process performance and foam system is not affected; ③ Do not allow material contact with moisture, at the production site, please pay attention to proper ventilation.