光聚合法合成聚丙烯酸-丙烯酸钠高吸水性树脂

摘要

Photopolymerization provides a simple, fast and easy method in the synthesis of super absorbent resin. In this paper, super absorbent resin composed of poly(acrylic acid-sodium acrylate) was synthesized by exposing NaOH neutralized acrylic acid aqueous solution to UV light in the presence of crosslinking agents N,N′-methylene bisacrylamide and photoinitiators. The effects of different kinds of photoinitiators and crosslinking agents, polymerization time, concentration of photoinitiators and the degree of neutralization on the properties of the resins were studied. The water absorption rates of the resin for deionized water and 0.9% NaCl solution are 1 550 mL/g and 160 mL/g, respectively.%以丙烯酸为原料,N,N′-亚甲基双丙烯酰胺为交联剂,采用光聚合的方法合成了聚丙烯酸-丙烯酸钠高吸水性树脂,并对光引发剂用量、曝光时间、丙烯酸中和度以及交联剂用量等对光聚合反应的影响和对产物吸水性能的影响进行了研究.所制得的吸水性树脂吸水率达1 550 mL/g,对0.9% NaCl溶液的吸液率为160 mL/g.