UV光聚合法合成高吸水性树脂中光引发剂的影响

The effect of photoinitiators on synthesis of super-absorbent resin by UV photopolymerization

UV光聚合法合成聚丙烯酸-丙烯酸钾(钠)高吸水性树脂,对比于传统的热聚合方法具有工艺简单、反应时间短、易操作、可在常温下进行以及无三废污染等优点。光引发剂是影响UV光聚合反应最重要的因素。本工作对Iragure651、Iragure819、Iragure184、Iragure1700、Iragure1800、Iragure2929等光引发剂的光引发进行了研究,包括光引发剂的种类、浓度和曝光时间等因素对光聚合体系及产品的吸水性能的影响。结果表明,用Iragure651和Iragure1700为光引发剂聚合效果最好。在相同的聚合条件下,以Iragure651为光引发剂合成的丙烯酸-丙烯酸钾高吸水树脂吸水率可达1358mL/g,吸盐水率可达115mL/g。

Synthesis of acrylic acid-acrylate salt (acrylic acid-potassium acrylate and acrylic acid-sodium acry- late) copolymer super absorbent resin (SAR) by UV photopolymerization have many merits compared with traditional methods, such as simple technology, short reaction time, normal temperature operation and no pollution. Photoinitia- tor is the most important factor of photopolymerization. In this paper, several kinds of photoinitiators ( Iragure651、 Iragure819、Iragure184、Iragure1700、Iragure1800 and Iragure2929) were studied, including the influence of varieties and concentration on the performance of UV copolymerization and the water absorption capacity of SAR. It shows Iragure651, Iragure1700 are efficient photoinitiators for photopolymerization of SAR. The proper exposing time for preparing SAR was about 10min. Using Iragure651 as photoinitiator, the water absorbency and 0.9% NaCl absor- bency of acrylic acid-potassium acrylate copolymer SAR reach 1358mL/g and 115mL/g respectively.