manufacturing process of polyurethannes expanses with trend. enflammees drops produce by burning

摘要

Prodn. of a flexible and elastic expanded polyurethane is described. A reaction mixt. is formed comprising is not 1 polyol, is not 1 organic polyisocyanate, is not 1 catalyst and is not 1 porophore, the amt. of polyisocyanate being is not 1 equiv. per total equiv. polyol plus porophore. during introduction into the mixing chamber, the polyol is kept at 19-30 degrees C (pref. 21-24 degrees c), the polyisocyanate at 18-27 degrees C (pref. 20-30 degrees c), and the catalyst and porophonre t 15-50 degrees C (pref. 20-30 degrees C). The mixt. is homogonised and then poured on to a surface. The mixt. also contains a melamine deriv. of formula I) (where A,B,D,E,F and G=H, OMe or ROCH2; R=1-4C alkyl, at least one of substits. is OMe or ROCH2) at 1-20 wt.% (or wt. of polyol) and at temp. of 15-50 degrees C (pref. 20-30 degrees C). The prod. is an expanded polyurethane which, when it burns, has a reduced tendency to form inflammable drops. The prod. can be applied in all normal uses of flexible polyurethanes, e.g. carpet backings, padding for clothes, furniture fillings, methesses. The prod. has much lower tendency to spread flame than conventional flexible polyurethanes.