申请人:The Upjohn Company
公开号:US04257996A1
公开(公告)日:1981-03-24
The use of polyisocyanates as binders in the preparation of particle boards is subject to the drawback that the boards exhibit a tendency to adhere to the face of the platens used in their formation. This problem is minimized by utilizing, in association with the polyisocyanate to be used as binder, minor amounts of one or more phosphates or thiophosphates of the formula: ##STR1## where R=alkyl (C.sub.3 and higher), alkenyl (C.sub.3 and higher), aryl, alkyl-substituted aryl, ##STR2## (where R.sub.2 is alkyl, aryl, or alkyl-substituted aryl, A and B are H, methyl, chloromethyl, 2,2,2-trichloromethyl, m=1-25) and lower-alkyl substituted by from 1 to 2 acyloxy groups where acyl is the residue of an aliphatic carboxylic acid having at least 2 carbon atoms; R.sub.1 is Cl, Br, lower-alkoxy, lower-alkylmercapto, arylamino, mono(lower-alkyl)amino, di(lower-alkyl)amino, hydroxy(lower-alkylene)oxy, aryloxy, hydrocarbylureido, and an enol residue; X=O or S and n=1 or 2. The polyisocyanates and the phosphates or thiophosphates are applied to the particles separately, or after preblending one with the other. Whether the components are applied separately or in combination one with the other, they can each be applied either neat or in the form of an emulsion or emulsions.
在制备颗粒板时,使用聚异氰酸酯作为粘合剂存在一个缺点,即板材有粘附在用于其制造的平板表面的倾向。通过在将用作粘合剂的聚异氰酸酯与一种或多种磷酸盐或硫代磷酸盐结合使用少量的方法,可以最小化这个问题,其中磷酸盐或硫代磷酸盐的公式为:##STR1##其中R = 烷基(C.sub.3及以上),烯丙基(C.sub.3及以上),芳基,烷基取代的芳基,##STR2##(其中R.sub.2为烷基,芳基或烷基取代的芳基,A和B为H,甲基,氯甲基,2,2,2-三氯甲基,m = 1-25)和下游烷基取代1-2个酰氧基,其中酰基是具有至少2个碳原子的脂肪族羧酸的残基; R.sub.1是Cl,Br,下游烷氧基,下游烷基硫醇,芳基氨基,单(下游烷基)氨基,双(下游烷基)氨基,羟基(下游烷基)氧基,芳氧基,羟基烷基脲和烯醇残基; X = O或S,n = 1或2。聚异氰酸酯和磷酸盐或硫代磷酸盐分别应用于颗粒,或在彼此预混后应用。无论组分是分别应用还是混合应用,它们都可以单独或以乳液或乳液形式应用。