Provided is a particulate water-absorbent agent having suppressed reduction of absorption capacity, after elapse of a long time, good gel layer diffusion performance and reduced Re-wet, a water-absorbent goods containing the water-absorbent agent, and a production method for the water-absorbent agent. The above problem is solved by a particulate water-absorbent agent having a polyacrylate salt-type water-absorbent resin as a main component, and having an absorption capacity without load of equal to or higher than 28 g/g, characterized by satisfying the following (a) to (c):
(a) amount of water-soluble component under stirring is from 15 to 60% by mass;
(b) difference between an amount of water-soluble component under stirring and an amount of water-soluble component in standing still (amount of water-soluble component under stirring - amount of water-soluble component in standing still) is from 15 to 50% by mass; and
(c) diffusion absorption index is from 1.40 to 10.0 g/g/min;
wherein the amount of water-soluble component under stirring represents amount of a dissolution polymer after 16 hours, to a normal saline solution under stirring, and the amount of water-soluble component in standing still represents amount of a dissolution polymer after 16 hours, to a normal saline solution in standing still.
本发明提供了一种在长时间使用后吸
水能力下降受到抑制、凝胶体层扩散性能良好且再湿度降低的颗粒状吸
水剂、一种含有该吸
水剂的吸
水制品以及该吸
水剂的生产方法。解决上述问题的方法是:一种以聚
丙烯酸盐类吸
水树脂为主要成分、无负荷吸
水能力等于或大于 28 g/g 的颗粒状吸
水剂,其特征在于满足以下(a)至(c)项:
(a) 搅拌下
水溶性成分的量为 15%至 60%(按质量计);
(b) 搅拌下的
水溶性成分的量与静止时的
水溶性成分的量之差(搅拌下的
水溶性 成分的量-静止时的
水溶性成分的量)为 15%至 50%(按质量计);以及
(c) 扩散吸收指数为 1.40 至 10.0 克/克/分钟;
其中,搅拌下的
水溶性成分的量表示 16 小时后溶解聚合物在搅拌下的正常生理盐
水溶液中的量,静置时的
水溶性成分的量表示 16 小时后溶解聚合物在静置时的正常生理盐
水溶液中的量。