Special polyurethane tank insulation foam 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. Food industry is the rapid development in China, (beer, wine, spices) fermentation tank, cryogenic liquid storage tanks as well as some storage tanks (such as liquid carbon dioxide) and other aspects of the insulation, the demand for polyurethane increasingly widespread. Polyurethane insulation for tanks, according to molding methods are generally divided into hand-casting, equipment type and infusion site sprayed three, often based on the shape of the tank, the situation on-site, the construction team habits to select the appropriate mode of operation . Due to the large tank insulation layer forming unable closed mold design mode (especially casting), it can not produce the necessary effect of closing die extrusion molding process, which is in the state of semi-free foam molded foam often have inevitably shaped shrinkage, such as the larger or uneven shrinkage can cause the insulation effect is reduced, unsightly and so on, how strictly control the shrinkage is the tank of ingredients, the selection of a vital part. l chemical composition and properties of polyether respect for tank 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 fluoride Several major type type, fluorine type 141b, CFC-free all water type. 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 manual casting process parameters mechanical irrigated sprayed Cream time s ≥20 7 ~ 14 2 ~ 4 Gel time s 70 ~ 120 30 ~ 50 8 ~ 12 min ≤5 ≤5 ≤5 curing time overall density kg / m3 35 to 50 35 to 50 32 to 50 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.