两性聚合物的制备及其应用研究

Preparation and Application of Amphoteric polymer

为制备一种对染色废水有显著脱色效果的絮凝剂,采用溶液聚合法,将两种阳离子单体二甲基二烯丙基氯化铵(DMDAAC)和丙烯酰氧乙基三甲基氯化铵(DAC)分别与丙烯酰胺(AM),丙烯酸(AA)共聚,合成了两性聚合物。研究了阳离子单体种类和引发体系对两性聚合物合成的影响,单体配比对合成产物特性黏数[η]的影响,确定了合适的制备条件:以AM、AA和DAC为单体,过硫酸铵为引发剂,单体的质量比为AM:AA:DAC=6:2 :4、体系pH为6．5。探讨了聚合物的用量、阴阳离子比例以及染色废水的温度、pH对脱色效果的影响。结果表明,所制备的两性聚合物,对皮革染色废水的脱色率达92％以上。常温(25℃)条件下,合成产物对皮革染色废水脱色的较佳pH值为3～4。

To obtain a flocculant which could effectively remove dyes from dyeing wastewater, the amphoteric polymer was prepared by copolymerization of acrylamide （AM）, acrylic acid （AA）, cationic monomer and dmethyldiallylammonium chloride（DMDAAC） or acryloyl oxyethyl trimethyl ammonium chloride（DAC）. Effects of cationic monomers and initiator system on the copolymerization, as well as monomers ratio on the intrinsic viscosity [ η] of the polyampholyte were investigated. The suitable reaction parameters for the copolymerization had been projected： AM、 AA and DAC as the monomers, ammonium persulfate as the initiator, ratio of monomers m （AM ： AA ： DAC=6 ： 2 ： 4）, pH value at 6. 5. The effects of monomer ratio, dosage, pH and temperature on the wastewater decolorization of developed polyampholyte were also investigated in detail. The experimental results indicated that the polyampholyte flocculant exhibited an excellent properties in leather dyeing wastewater, with a decolorization ratio of 92% under pH value of 3-4 and temperature at 25 ℃.