新型改性高吸水树脂P(AA-AM)的合成及性能评价

以N,N’-亚甲基双丙烯酰胺为交联剂,过硫酸钾为引发剂,丙烯酸、丙烯酰胺为原料,合成出原位自交联高吸水树脂P(AA-AM)。通过正交实验得出最佳合成工艺为:n(丙烯酸)∶n(丙烯酰胺)=4.5∶1,单体浓度5%,中和度70%,交联剂0.12%,引发剂0.30%(以上均相对AM、AA总量而言);产物的最大吸液性能为:吸蒸馏水最大倍率QW=2 152.4 g/g,吸10%盐水最大倍率Q盐水=28.5 g/g;由于引入适量的AM,产物吸水率和吸盐率得到大幅度的提高,产物形态由最初的粘接颗粒变成分散颗粒。

Synthesis and evaluation of superabsorbent resin P(AA-AM)

Some autogenic cross-linking superabsorbents P(AA-AM) were synthesized by copolymer of part-neutralised acrylic acid (AA) and acrylamide (AM) with potassium peroxydisulfate as initiator,N,N'-methylene-bis-acrylamide as crosslinking agent,by means of water solution polymerization.By the method of orthogonal test,the best synthesis condition were as follows:the mole ratio of acrylic acid (AA) to acrylamide (AM) was 4.5:1,monomer concentration was 5%,neutration of acrylic acid 70%,crosslinker concentration 0.12%,initiator concentration 0.30%;the results indicate that the absorbency of P(AA-AM) is up to Q_W=2 152.4 g/g,and Q_8=28.5 g/g in distilled water and in 10% NaCl solution respectively;through the introduction of AM,the rate of water absorption (Q_W) and the rate of salt absorption (Q_s) for product were greatly improved.The initial shape of product was changed from the bonding particles to the dispersion of particles.