A novel additive for papermaking is disclosed. The additive comprises an aqueous solution of a copolymer obtained by reacting (a) an acrylamide, (b) a vinyl monomer which is copolymerizable with component (a) and has a cationic group, (c) at least one of vinyl monomers which are copolymerizable with component (a) and (b) and have 2, 3 or 4 carboxyl groups in a molecule thereof and/or a salt thereof, optionally (e) a nonionic monomer which is copolymerizable with components (a), (b) and (c) if desired, and (d) a cross-linking compound, in the presence of (f) at least one of ethylene glycol, diethylene glycol, diethanolamine and glycerin.
This novel additive for papermaking is able to achieve excellent freeness and yield in the process of papermaking and provides paper with increased strength.
本发明公开了一种新型造纸添加剂。该添加剂包括一种共聚物的
水溶液,该共聚物通过以下反应获得:(a)
丙烯酸酰胺;(b) 可与组分(a)共聚并带有阳离子基团的
乙烯基单体;(c) 可与组分(a)和(b)共聚并在其分子中带有 2、(d) 交联化合物,(f) 至少
乙二醇、
二甘醇、
二乙醇胺和
甘油中的一种。
这种新型造纸添加剂能够在造纸过程中获得极佳的白度和产量,并提高纸张强度。