小麦秸秆／改性膨润土基高吸水性树脂的制备

为了提高树脂的吸水率、抗盐性和重复吸水后的凝胶强度,本研究将预处理后的小麦秸秆,通过水溶液聚合法与丙烯酸、丙烯酰胺、 改性膨润土共聚合成高吸水性树脂。探讨交联剂用量、引发剂用量、单体质量比、丙烯酸中和度、预处理后的小麦秸秆和膨润土用量等单因素对树脂吸水率和吸盐水率的影响,并确定了合成的适宜条件。通过红外光谱对预处理后的小麦秸秆和合成的高吸水性树脂的结构进行了分析,对比了最佳条件下添加和不添加改性膨润土所制备的高吸水性树脂的吸液率、重复吸液率和重复吸液后的凝胶强度。结果表明:最佳条件下制得的树脂在蒸馏水和0.9 ％盐水中的吸液率分别为195.7g?g-1和24.2g?g-1,且最佳条件下添加改性膨润土比没有添加所制备的高吸水性树脂在吸液率、重复吸液率和重复吸液后的凝胶强度方面都明显改善。

Preparation of absorbent resin based on wheat straw/modified bentonite

In order to improve the water absorption, salt resistance and gel strength after repeating absorbing of superabsorbent resin(SAR), a novel SAR was prepared by the solution polymerization of pretreatment wheat straw (WS), modified bentonite, acrylic acid (AA) and acrylamide (AM). The dosage of cross-linking agent and initator, mass ratio of monomer, neutralization degree of AA, the dosage of WS and modified bentonite were investigated, which could influence the water absorption capacity of SAR. FT-IR was conducted to characterize the structure of WS and SAR. The result was obtained as follows: the best water absorption capacity of SAR was 195.7g?g-1 in distilled water and 24.2g?g-1 in 0.9 wt ％ NaCl solution, respectively. Compared with the SAR without adding the modified bentonite, the SAR containing modified bentonite was much better in water absorption, repeating absorption and gel strength after repeating absorbing.