A method for determining the quality of polyurethane stabbing formula

China Coatings Online News Information: Polyurethane squig gum is commonly known as squig gum, usually its main component is polyurethane pre-polymer, by polycyanate compounds, polyester or polyether polyols, catalysts and solvents and other reactions. Polyurethane stabbing gum pipe and gun type two, polyurethane stabbing gum reaction activity is high, often used in doors and windows, such as installation fill, bonding, leak blocking, insulation, sound insulation, waterproof, is an environmentally friendly energy-saving, easy to use building materials.to judge the quality of polyurethane styrofi formula can be good or bad through the following methods: 1, if it is the use of gun-type polyurethane styrofi, see the effect of the gun, foaming, the foam hope is smooth, can not be too thin or too thick, too thin is not big foam, and the bubble hole will collapse, too thick performance of foam dry, foam easy to contract;2, spray polyurethane styrofi in the newspaper to form a layer of foam material, the next day to see if the ends of this layer of foam material up. If raised, it indicates that the foam shrinks, the higher the, the more severe the contraction, if the ends do not rise, it indicates that the foam is good3, cut the foam, look at the internal structure of the bubble hole, if the bubble hole is uniform and thin, it indicates a good bubble, such as the bubble hole is very large, and the density is not good as a secondary product; 4, observe the foam surface of polyurethane styrofi, good foam surface is ravine-shaped, smooth but glossy is not very bright; poor foam surface is flat, no folds; 5, observe the bubble size of polyurethane foam, for good foam, foam full of round; poor foam is small, and collapse; 6, with the finger press foam, foam elastic, is a good foam; poor foam is not elastic, press up very hard, brittle