公开(公告)号：US3985696A

公开(公告)日：1976-10-12

申请号：US523555

申请日：1974-11-14

申请人： Alois Aignesberger ,  Paul Bornmann ,  Hans-Gunter Rosenbauer ,  Hans Theissig

发明人： Alois Aignesberger ,  Paul Bornmann ,  Hans-Gunter Rosenbauer ,  Hans Theissig

IPC分类号： C04B24/30 ,  C08F12/32 ,  C08G12/00 ,  C08G12/32 ,  C08G12/40 ,  C08L61/20

CPC分类号： C08G12/40 ,  C08F12/32

摘要： Aqueous solutions of melamine-formaldehyde and melamine-urea-formaldehyde condensation products having anionic sulfo groups in concentrations as high as 50% by weight may be prepared in a three-stage process. In the first stage, melamine or a mixture of melamine with up to 40 mole-% urea, formaldehyde, and an alkali metal sulfite are condensed in aqueous solution at 60.degree.-80.degree.C and pH 10-13 until the solution is free from readily detectable amounts of sulfite. In the second stage, condensation is continued at pH 3.0-4.5 for 30 to 90 minutes. In the third stage, a temperature of 70.degree. to 95.degree.C and a pH of 7.5 to 9.0 are maintained until a sample of the solution, when diluted to 20% solids by weight, has a viscosity of 5 to 40 centipoises at 20.degree.C.

摘要翻译： 具有浓度高达50重量％的阴离子磺基的三聚氰胺 - 甲醛和三聚氰胺 - 脲 - 甲醛缩合产物的水溶液可以在三步法中制备。 在第一阶段，三聚氰胺或三聚氰胺与高达40摩尔％的尿素，甲醛和碱金属亚硫酸盐的混合物在60℃-80℃和pH 10-13的水溶液中冷凝直到溶液不含 容易检测量的亚硫酸盐。 在第二阶段，在pH3.0-4.5下继续冷凝30至90分钟。 在第三阶段中，保持70℃至95℃的温度和7.5至9.0的pH，直到溶液样品稀释至20重量％固体时，在20℃下的粘度为5至40厘泊 C。