微波辐射APT–g-PAMPS高吸水性树脂的制备及性能

以凹凸棒黏土(APT)和2-丙烯酰胺基-2-甲基丙磺酸(AMPS)为原料,过硫酸钾(KPS)为引发剂,N,N'-亚甲基双丙烯酰胺(NMBA)为交联剂,采用微波辐射法接枝共聚合成了APT-g-PAMPS耐盐性复合高吸水性树脂,用FTIR和XRD对复合吸水性树脂的结构进行了表征。考察了微波功率和时间及APT用量对树脂吸水倍率的影响,测定了不同APT用量高吸水性树脂的吸水速率、保水性能及反复吸水性能。FTIR和XRD结果显示,APT和有机单体之间发生了接枝共聚反应,其反应仅在APT的表面进行,单体并没有插入到APT的层间。结果表明,微波功率为195 W,辐射时间为2.5 min,w(APT)=5%时,树脂在去离子水和生理盐水中的吸水倍率分别为987g/g和102 g/g。该复合高吸水性树脂具有较快的吸水速率、较强的保水性能和较好的反复吸水性能。在体系中引入适量APT能够显著提高复合吸水树脂的吸水能力和耐盐性能,同时能明显加快树脂的吸水速率和提高树脂的保水性能。

Preparation and Properties of Attapulgite Grafted PAMPS Superabsorbent Resin by Microwave Irradiation

A novel attapulgite clay -g-poly(2-acrylamido-2-methylpropanesulfonicacid) (APT-g-PAMPS) superabsorbent resin was synthesized by aqueous solution polymerization using microwave irradiation in the presence of Potassium persulfate (KPS) as a initiator and N, N-methylene-bis-acrylamide (MBA) as a crosslinking agent. The chemical structure of APT-g-PAMPS superabsorbent resin was determined by FT-IR and XRD. The influence of the content of APT, microwave power and time on water absorbency was investigated. The swelling behaviors, the water retention and reswelling capability of superabsorbent resin with different APT content were also examined. FITR and XRD characterization indicated that APT and AMPS happened the grafting copolymerization reaction, the reaction occurs only in the APT surface, and AMPS was not inserted into the APT interlayer. Microwave power was 195W, microwave time was 2.5min and APT amount was 5% (mass fraction), the water absorbency of superabsorbent resin in deionized water and normal saline were 987g /g and 102g/g, respectively. The superabsorbent resin has a faster absorption rate, stronger water retention and better reswelling capability. The water absorbency, salt-water performance, water retention and absorption rate of the superabsorbent resin could be remarkably enhanced by introducing a proper amount of APT.