酯类交联剂交联丙烯酸钠吸水树脂的紫外引发制备与性能

Ultraviolet Preparation and Properties of Ester Crosslinking Acrylic Acid Sodium Superabsorbent Polymer

以部分中和的丙烯酸为原料,分别以乙二醇二甲基丙烯酸(EGDMA)、二甲基丙烯酸甘油酯(GDA)与三乙二醇二甲基丙烯酸(TEGDMA)为交联剂,通过紫外引发合成了聚丙烯酸钠缩乙二醇二甲基丙烯酸(PAANa-E)、聚丙烯酸钠缩二甲基丙烯酸甘油酯(PAANa-GDA)、聚丙烯酸钠缩三乙二醇二甲基丙烯酸(PAANa-TE)3种丙烯酸钠高吸水树脂。考察了交联剂用量、单体体积分数、丙烯酸中和度、辐照时间对树脂吸液率的影响,研究了3种不同链长的酯类交联剂制备的树脂吸液率与温度、pH、盐溶液浓度的关系。采用红外、热失重分析对树脂进行了表征。结果表明:以上3种树脂在最佳条件下吸去离子水率和吸NaCl溶液率分别为2 509,170g/g;2 291,125g/g;3 930,219g/g。其中PAANa-TE的吸液率最高,PAANa-E的吸液率次之,PAANa-GDA的吸液率最低。当极性基团类型相同,数量不同时,PAANa-E、PAANa-TE树脂的吸液率随着交联剂所含醚基数目的增加显著提高。

Three kinds of acrylic acid sodium superabsorbent polymers（SAPs）,acrylic acid sodium polymerized glycol two methylacrylic acid（PAANa-E）,and acrylic acid sodium polymerized two methylacrylic acid glyceride（PAANa-GDA）,and acrylic acid sodium polymerized three glycol two methylacrylic acid（PAANa-TE）,were synthesized using the part neutralized acrylic as raw material,EGDMA,GDA and TEGDMA as crosslinking agent by ultraviolet light trigger polymerization.The effect of crosslinking agent amount,monomer volume fraction,acrylic acid neutralization degree and radiation time on liquid absorbency were examined.The relationship between liquid absorbency of three kinds of SAP with different chain length and temperature,pH,solution ionic concentration were studied respectively.SAP was characterized by FT-IR and TGA.Results showed that liquid absorbency of the three kinds of SAP were 2 509,170 g/g;2 291,125 g/g;3 930,219 g/g in the ionized water and NaCl solution respectively.PAANa-TE showed the highest absorbency rate,PAANa-E showed better,PAANa-GDA showed the least absobency rate.When PAANa-E and PAANa-TE contained the same polar group types and the different amounts of ether bases,the liquid absorption rate increased significantly with the increasing of ether base amount.