Synthesis And Performance Test Of Amphoteric Copolymers

The paper copolymerizes two kinds of cationic copolymers by aqueous solution copolymerization which have been partly hydrolyzed with alkali to synthesize amphoteric copolymers and determines the art of it. On the basis of determination, experiments have made on the conditions for copolymerizaition of amphoteric copolymer, and attain wastewater's flocculants with perfect performances.In the aspect of synthesis, the one experiment is to make the fist kind amphoteric polyacrylamide. Cationic copolymers(Ⅰ) is made by aqueous solution copolymerization. When to add and the quantity of the chain transfer agent are studied by orthogonal test. The results indicate that the quantity of the chain transfer agent 2% the total quantity of cationic monomer is added when the copolymerization has been 40mins. The reaction product has the high conversion percent and better dissolving power.The first kind amphoteric copolymer (Ⅰ)is synthesized by partly hydrolyzed cationic copolymer (Ⅰ) with alkali. Temperature, reaction time and the quantity of alkali are studied by orthogonal test. The results indicate that when the temperature is 60℃,the reaction time is 75min, the quantity of alkali is 1/10(the quantity of alkali/ the quantity of cationic monomer), the effect is the best.The other kind cationic copolymer (Ⅱ) is to be synthesized by aqueous solution copolymerizion of acrylamides and DMC, then hydrolyzed to make the amphoteric copolymer(Ⅱ). By the orthogonal test, about acrylamide/cationic (mol ration), the quantity of redox catalyst and the temperature are studied in the experiment of making cationic copolymer. The results indicate that when acrylanide/cationic acrylamide (mol ration) is 9:1, the quantity of redox catalyst is 0.05%(the quantity of redox/the total quantity of monomer),the temperature is 55℃,the product has the conversion of 98%.The next is to hydrolyze the cationic copolymer(Ⅱ) partly in order to attain the amphoteric copolymer(Ⅱ). By orthogonal test the temperature, reaction time and the quantity of alkali are studied. The results indicate that when the temperature is 60℃, the reaction time is 90min, the quantity of alkali is 1/10 , the amphoteric product has 98.2% yield and dissolved 100%.In the aspect of quality of the products , the paper mainly determines the content of the left monomer and the extent of cation The reaction products amphoteric copolymer have perfect performance and application in the industry water treatment.