Polyurethane panel box type thermal insulation board production

Adopt similar to the box type soft foam production mold, the portfolio polyether foam to box machine working in the kettle, stir into the foaming stirring barrels, in a few minutes and then enter the isocyanate component, high speed stirring after 30 seconds, filed a stirring barrels and at the same time open the barrel bottom cover, the blend of black and white material into the box in the mold ( The mold surface coated with release agent shop or on the surface of polyethylene plastic film) Foam, put the floating roof, mixture. Placed after 20 min, the box body can be open around the sides, remove the rigid polyurethane foam, natural curing to cut after 24 h. Box-type insulation plate hard foam composite material production pay attention to the following aspects: (1) selection of official degree polyether polyol; 2 water should be controlled in 0. 1% ~ 0. 5%, avoid excessive heat cause burning foam core; (3) control the viscosity of composite cannot too big, if the viscosity is too big, should choose delayed catalyst, with appropriate to extend the time of mixing time and milky white, is conducive to a large number of raw materials mixing, reaction completely in the large mold, improve liquidity. (4) in the formula to determine under the premise of the raw material temperature is the main factors influencing the foaming speed. General should control material temperature around 15 ℃. Material temperature is too high, too fast reaction, in the fierce heat, and low coefficient of thermal conductivity of polyurethane foam itself, the accumulation of heat is not easy to be spread, and a lot of heat concentration can cause burning foam core. In our country, refrigerated insulated car compartments board, need a lot of demand for more and more big, the body of the box body material is polyurethane rigid foam. Henan ice bears refrigerator car factory always adopt the method of batch production sheet. As countries on the sandwich board products are safe and environmental protection performance and service life requirements increase, in the next five years, polyurethane plate demand will reach 30 million m3, the market share of more than 60%.