正交试验法优化高分子量聚丙烯酸钠合成工艺

Synthesis Technique Optimization of High Molecular Weight Sodium Polyacrylate by Orthogonal Experiment

采用水溶液聚合法,以过硫酸铵为引发剂,亚硫酸氢钠为链转移剂,利用正交试验L_(16)(4~5)对合成聚丙烯酸钠的主要影响因素,如过硫酸铵用量、亚硫酸氢钠用量、单体浓度、聚合温度和聚合时间等,进行了优化,并通过FT-IR对产品进行检测。实验表明,过硫酸铵用量0.02%,亚硫酸氢钠用量0.01%,单体浓度为45%,聚合温度为50℃,聚合时间4h,制备的聚丙烯酸钠平均相对分子质量约为34.3×10~6,其红外谱图与标准谱图基本一致。将其用于泥浆水的絮凝沉降,取得了良好的效果。

Adopting aqueous solution polymerization, （NH4）2S208 was used as initiator and NaHS03 was used as Chain transfer agent to carry on the experiment. The main influences, such as the amount of （NH4）2S208 and NaHS03, monomer concentration, polymerization temperature, polymerization time, were optimized by orthogonal experiment L16 （45）,and product was analyzed by FT - IR. The results showed that the amount of （ NH4 ） 2 S2 O8 was 0. 02% , the amount of NaHS03 was 0. 01% , monomer concentration was 45% , polymerization temperature was 50℃, polymerization time was 4h, the average relative molecular mass of sodium polyacrylate could reach to 34. 3 ×10^6. The infrared spectrum of product was consistent with the standard spectrum, and use it for flocculent precipitate of muddy water, good results had been achieved.