以丙烯腈改性淀粉为分散剂的阳离子苯丙乳液的研制

Study on preparing cationic styrene-acrylate emulsion with starch modified by acrylonitrile as dispersant

以丙烯腈改性淀粉为分散剂,采用自由基聚合法在淀粉分子链上接枝苯乙烯(St)、丙烯酸丁酯(BA)、甲基丙烯酸二甲基氨基乙酯(DM)和丙烯酰胺(AM)等共聚单体,合成出一种新型的阳离子型淀粉接枝苯丙乳液施胶剂。探讨了K2S2O8/NaHSO3氧化还原型引发剂、共聚单体等对施胶剂施胶效果的影响。结果表明:当w(DM)=2%、w(AM)=0.3%、m(改性淀粉)∶m(单体)=1.0∶1.5、m(St)∶m(BA)=2.3∶1.0、引发剂中m(K2S2O8)∶m(NaHSO3)=1.0∶1.0且氧化剂w(K2S2O8)=0.10%时,施胶剂的施胶效果最佳,并且优于传统苯丙乳液施胶剂。

With stareh modified by acrylonitrile （AN） as dispersant,the starch molecular chain grafted by some comonomers such as styrene （St） , butyl acrylate （BA）, dimethyl amino ethyl methacrylate （ DM ） and acrylamide（AM） via free radical polymerization,then a new type cationic starch grafted by styrene-amylate emulsion as sizing agent was synthesized. The influences of some factors such as K2S2O8/NaHSO3 redox initiator, comonomer were discussed on sizing resuhs of sizing agent. The results showed that the sizing result of sizing agent,which was better than that of traditional styrene-acrylate emulsion sizing agent,was optimal when mass fractions of DM and AM were 2% and 0.3% respectively,mass ratios of re（modified starch）：m（monomer） and m（St）：m（BA） were 1.0：1.5 and 2.3：1.0 respectively,mass ratio of m（K2S2O8）：rn（NaHSO3） was 1.0：1.0 in initiator and mass fraction of K2S2O8 was 0.10% in oxidant.