聚（丙烯酸-醋酸乙烯酯）- 聚乙烯醇互穿网络高吸水性树脂的合成

Synthesis of Superabsorbent of Poly (acrylic acid-vinyl acetate) and Polyvinyl alcohol Interpenetrating Polymer Networks

摘要:

以丙烯酸（AA）、醋酸乙烯酯（VAc）、聚乙烯醇（PVA）为原料，过硫酸钾为引发剂，N,N-亚甲基双丙烯酰胺为交联剂，环己烷作为油相，span60为分散剂，采用反相悬浮法制备出聚（丙烯酸-醋酸乙烯酯）-聚乙烯醇互穿网络(IPN)高吸水性树脂。研究了丙烯酸中和度、单体物料比、引发剂用量、交联剂用量、反应时间以及聚乙烯醇用量等因素对高吸水性树脂吸液倍率的影响。筛选出了最佳工艺条件为：丙烯酸中和度为70%，丙烯酸与醋酸乙烯酯质量比为3:1，引发剂质量分数为0.4%，交联剂质量分数为0.035%，反应温度为70℃，PVA质量分数为8% 。在最佳工艺条件下，树脂对蒸馏水和质量分数0.9%生理盐水的吸液倍率分别为1889g/g和124g/g，具有良好的吸水性。并用红外光谱仪、扫描电镜、热重分析仪对其结构进行了表征。

Abstract:

The poly (acrylic acid and vinyl acetate) - polyvinyl alcohol IPN superabsorbent resin was prepared by inverse suspension method, using cyclohexane as continuous phase, N,N-methyl- ene-bis-acrylamide as crosslinking agent，potassium persulfate as initiating agent，and Span 60 as dispersing agent. The effects of the degree of neutralization of acrylic acid，the monomer mixture ratio，PVA amount，initiating agent amount, crosslinking agent amount, and polymerization temperature were investigated. The results showed that the optimal conditions were as follows: neutralization degree of AA was 70%, m(AA):m(VAc)=3:1, w(initiator agent)=0.4%, w(crosslinking agent)=0.035%, w(PVA)=0.8%, reaction temperature 70℃. The resin has higher absorption rate with the water absorption rate under the optimal conditions reaching 1 889 g /g and the salt absorption rate reaching 124 g /g．The superabsorbent resin was characterized by means of IR spectroscopy, SEM and TG.