diaminodiphenylmethane in Vietnamese
@Chuyên ngành kỹ thuật
@Lĩnh vực: hóa học & vật liệu
-điaminođuphenylmeta
Sentence patterns related to "diaminodiphenylmethane"
1. Methods comprising: providing an aromatic polyisocyanate and a polyol; and reacting the aromatic polyisocyanate and the polyol in the presence of a blowing agent and a catalyst to form a rigid polyurethane foam; wherein the blowing agent comprises water and a hydrocarbon having 3 to 8 carbon atoms; and wherein the polyol comprises a poiyether polyol of a mean functionality of 4.5 or more obtained by adding an alkylene oxide to a mixture of diaminodiphenylmethane and polymethylene polyphenylamine where n=0 is 50 to 70% by weight and n≥1 is 30 to 50% by weight, wherein the amount of a compound of n=4 relative to said mixture is 2.5% by weight or more, as expressed by the formula (1):.