明胶接枝共聚物乳液的合成及其对纸张强度的影响

Syntheses of Emulsions of Gelatin-grafted Polymer and Its Effect on the Intensity of Sheets

以明胶、丙烯酰胺(AM)、甲基丙烯酰氧乙基三甲基氯化铵(DMC)为原料,在非离子乳化剂、阳离子乳化剂及二者的复合乳化剂的条件下,以氧化-还原引发剂作为引发体系,采用乳液聚合法合成了一系列明胶接枝共聚物乳液。考查了单体的加料方式,不同种类和不同配比的乳化剂对乳液及纸张增强效果的影响。结果表明,单体采用一次性加料,非离子型乳化剂和阳离子型乳化剂复配的情况下,合成的乳液对阔叶材木浆的增强效果最好。当非离子型乳化剂(OP)和阳离子型乳化剂(Y1)按2.5∶7.5(质量比)进行复配所合成的乳液当其用量为1%(相对绝干浆)时,对纸页物理强度提高最大,纸页裂断长、撕裂指数、耐破指数、耐折度相应比空白样提高了23.9%、7.6%、21.2%和186%。

A series of emulsions of gelatin-grafted polymer were synthesized by polymerization of gelatin with acrylamide （AM） and methacryloyloxyethyl trimethylammonium chloride （DMC） using oxidation-reduction initiator blended with non-ionic emulsifier and cationic emulsifier at different ratios. Effects of feeding method of monomers, kinds and dosages of emulsifiers on the reaction were studied in detail. The results showed that this emulsion could improve physical strength of wood pulp handsheets obviously when all monomers were added simultaneously. The optimum proportion of non-ionic emulsifier （OP） to cationic emulsifier （ Y1 ） rn（OP） ： m（Y1 ） was 2.5 ： 7.5. Compared with the control sample, breaking length, tearing index,burst index and folding endurance were increased by 23.9 %, 7.6 %, 21.2 % and 186 %, respectively, when the dosage of emulsion was 1.0 % （ based on o. d. pulp）.