有机硅改性两性离子型聚丙烯酰胺的应用

Application of amphoteric polyacrylamide modified by organic silicon

以丙烯酰胺(AM)为反应单体,乙二胺四乙酸二钠(EDTA)为配位剂,碳酸二甲酯为稳定分散剂,十二烷基苯磺酸钠为表面活性分散剂,四甲基乙二胺(TMEDA)为催化剂,偶氮二异丁氰(AIBN)为引发剂,在N-N甲叉双丙烯酰胺(MBA)交联作用下链接阴离子单体甲基丙烯酸二甲氨乙酯(DMAEA)、阳离子单体甲基丙烯酰氧乙基三甲基氯化铵(DMC),并用硅烷偶联剂(KH-570)进一步改性,通过胶束聚合技术合成阴/阳两性聚丙烯酰胺絮凝剂。通过电动离心机和722S分光光度计,测定絮凝效果最好时,絮凝剂中各试剂最佳用量:n(DMC)∶n(DMAEA)=1.0∶1.2;w(AM)=13.3%;w(AIBN)=0.9%;w(碳酸二甲酯)=46.9%;w(KH-570)=0.6%;w(十二烷基苯磺酸钠)=10%。

The anionic/cationic amphoteric polyacrylamide flocculant was prepared by micellar polymerization through crosslink of anionic monomer dimethyl methacrylate(DMAEA),cationic monomer methyl acryloyl oxygen ethyl trimethyl ammonium chloride(DMC)by N-N methylene double acrylamide(MBA),and further modified by silane coupling agent(KH-570)using acrylamide(AM)as the monomer,ethylenediamine tetraacetic acid disodium salt(EDTA)as the complexing agent,dimethyl carbonate as the stability dispersant,sodium dodecyl benzene sulfonic acid as the surface active dispersant,tetramethyl ethylene diamine(TMEDA)as the catalyst,azo diisobutyl cyanogen(AIBN)as the initiator.Electric centrifuge and 722S spectrophotometer were used to ascertain the optimum dosage of each reagent when flocculant effect was the best,which were n(DMC):n(DMAEA)=1.0∶1.2;ω(AM)=13.3%;ω(AIBN)=0.9%;ω(dimethyl carbonate)=46.9%;ω(KH-570)=0.6%;ω(sodium dodecylbenzenesulfonate)=10%.