大颗粒吸水树脂的制备工艺及其性能

Preparation and properties of water-absorbent resin with large particles

采用反相悬浮聚合制备了大颗粒聚丙烯酰胺-丙烯酸-丙烯酸钠[P(AM-AA-SA)]树脂微球,考察了搅拌速率与乳化剂对树脂微球粒径的影响,交联剂用量、单体配比和丙烯酸中和度对330μm树脂微球吸水倍率的影响,丙烯酸丁酯的用量对树脂吸水速率的影响以及树脂微球在80℃下的保水性能。结果表明:制备的树脂吸去离子水量达983.0 g/g,对NaCl和CaCl2溶液的吸水倍率最大值分别为91.3,15.6 g/g,在80℃下有良好的保水性能,丙烯酸丁酯的加入可将吸水饱和时间延长2倍。

A kind of absorbent resin microspheres with large particle size was synthesized from acrylic acid （AA）, acrylamide （AM） and sodium acrylate via inverse suspension polymerization. The effects of stirring speed and emulsifier on the particle size, the influences of erosslinker dosage, monomer ratio and neutralization value of AA on absorptivity of the resin microspheres with diameter of 330 μm and the effects of butyl acrylate（BA） amount on absorption rate of the resin were explored respectively. The water retention ability of the resin microspheres at 80℃ was tested. The results show that the resin so prepared absorbs deionized water up to 983.0 g/g and its maximum absorptivity of NaCl and CaC12 solution is 91.3 g/g and 15.6 g/g, respectively. The resin exhibits superior water retention ability at 80 ℃ and the introduction of BA can treble the time of saturated absorption of the resin.