壳聚糖-硅藻土-聚丙烯酸高吸水性树脂

Chitosan-Diatomite-Polyacrylic Acid Superabsorbent

以丙烯酸,硅藻土为原料,过硫酸铵为引发剂,N,N’-亚甲基双丙烯酰胺为交联剂,通过接枝壳聚糖制备了壳聚糖-硅藻土-聚丙烯酸高吸水性树脂,并对高吸水性树脂的结构进行了红外光谱的表征,系统研究了引发剂、交联剂、硅藻土的用量,丙烯酸与壳聚糖的质量比,丙烯酸的中和度,反应温度以及反应时间对高吸水性树脂吸水率的影响。实验结果表明,丙烯酸与壳聚糖的质量比为12∶1,硅藻土的含量为1%,引发剂和交联剂的用量分别为2.5%和0.16%,中和度为70%,反应温度为60℃,反应时间为5.5h时,合成的壳聚糖-硅藻土-聚丙烯酸高吸水性树脂吸水(盐)率最高,分别为145g/g和30g/g。

Using acrylic acid and diatomite as raw material, ammonium persulfate as initiator and N, N′- methylenebisacrylamide as crosslinker, chitosan-diatomite-polyacrylic acid superabsorbent was prepared by grafting chitosan. Structure of the superabsorbent was characterized by infrared spectroscopy. Factors affecting the water absorbabilit of the superabsorbent, such as content of initiator, crosslinker and diatomite, mass ratio of acrylic acid to chitosan, neutralization degree of acrylic acid, reaction temperature and reaction time, were studied. Experimental results showed that the best conditions were as follows mass ratio of acrylic acid to chitosan was 12 ： 1, content of diatomite, initiator and crosslinker is 1%, 2.5% and 0.16%, respectively, neutralization degree was 70%, reaction temperature was 60℃, and reaction time was 5.5 h. Under these conditions, the maximum water absorbance and maximum salt water absorbance Of the superabsorbent were 145 g/g and 30 g/g, respectively.