辉光放电电解等离子体引发合成聚丙烯酸钠/腐植酸复合高吸水性树脂

以丙烯酸和腐植酸为原料，N,N-亚甲基双丙烯酰胺为交联剂，在水溶液中采用辉光放电电解等离子体引发聚合反应制备聚丙烯酸钠/腐植酸复合高吸水性树脂。 考察了放电电压、交联剂、丙烯酸中和度、后聚合温度、腐植酸钠和丙烯酸的含量对树脂吸水率的影响，讨论了树脂在0.9%氯化钠溶液中的溶胀速率和不同pH值溶液中的溶胀行为。 用红外光谱和热重分析分别对产物进行了结构表征和稳定性测试，结果表明，最佳的合成条件为：放电电压470 V、交联剂质量分数为0.6%、腐植酸钠质量分数为4%、丙烯酸质量分数为10%、中和度60%、后聚合温度70 ℃。 所得复合树脂对蒸馏水的吸水率为1152 g/g，对0.9%NaCl溶液的吸水率为89 g/g，800 ℃后复合树脂残留率为44.3%。

Synthesis of Composite Superabsorbent of Poly( acrylic acid sodium)/Humic Acid by Using Glowdischarge Electrolysis Plasma

Poly(acrylic acid sodium)/humic acid superabsorbent composite was prepared in aqueous solution by using glow-discharge electrolysis plasma.Acrylic acid and humic acid were used as raw materials and N,N-methylenebisacrylamide as crosslinking agent.The effects of absorbency were examined in detail,such as the discharge voltage,crosslinking agent,neutralization degree of acrylic acid,polymerization temperature,amounts of sodium humate and acrylic acid.The swelling rate in 0.9% sodium chloride solution and the swelling behavior in various pH value solutions were also investigated.The structure and thermal stability of the resulting products were also characterized by Fourier transform infrared spectroscopy and thermogravimetric analysis.The results show that the discharge voltage,amount of crosslinking agent,sodium humate,acrylic acid,neutralization degree of acrylic acid,reaction temperature were 470 V,0.6%,4%,10%,60% and 70 ℃,respectively,under the optimal conditions.The superabsorbent has higher water absorbency,i.e.1152 g/g for distilled water and 89 g/g for 0.9% sodium chloride solution.The retention rate of the composite is about 44.3% after heating to 800 ℃.