新型两性聚丙烯酰胺型纸张增强剂的制备研究

Study on the preparation of a novel amphoteric polyacrylamide paper dry-strength agent

针对抄纸系统的最新发展动向设计并制备了一种新型两性聚丙烯酰胺型纸张增强剂.该增强剂系经过了结构改性的具备空间枝化结构的丙烯酰胺-甲基丙烯酰氧乙基三甲基氯化铵-马来酸(AM/DMC/MA)三元共聚产物.具体的合成条件是:单体摩尔配比n(AM)n(DMC)n(MA)=10063,产物的固含量为15%,以过硫酸铵为引发剂,分前后两次引发,前期引发剂用量为单体质量的0.06%,后期引发剂用量为单体质量的0.027%,终止剂用量为引发剂总量的5倍,结构改性剂M的用量为单体质量的0.50%,结构改性剂N的用量为单体质量的0.07%.据此制备的两性聚丙烯酰胺用于牛卡纸底浆,用量为3.0%时,手抄成纸的耐破指数可提高31%,环压指数则提高了35%.

According to the papermaking system＇s latest developing trend,designed and prepared a novel amphoteric polyacrylamide paper dry-strength agent,which is the copolymerization product of AM,DMC and MA,and had been modified and with branched structure. Its optimum preparing conditions were determined as follows：the molar ratio of AM,DMC and MA is 100：6：3,the total solid content of the product is designed to be 15%,the initiator was ammonium persulfate,initiated twice,firstly its dosage is 0.06%,based on the weight of the monomers,and 0.027% for the second time,while the dosage of the terminator is 5 times the weight of the total initiators＇,as for structure modifier MN,their dosages,relative to the weight of the monomers,were 0.50% and 0.07%. When this amphoteric polyacrylamide was used in kraft paper bottom pulp by 3.0%,the handmade paper＇s bursting index and ring crush index increased by 31% and 35%.