自交联阳离子丙烯酰胺共聚物合成及应用

以甲基丙烯酰氧乙基三甲基氯化铵（DMC）作为阳离子单体，甲基丙烯酸缩水甘油酯（GMA）为交联单体，与丙烯酰胺（AM）通过水溶液共聚法，并采用分子量调节剂和活性基团保护剂，本文制备得到自交联阳离子丙烯酰胺共聚物（G-CPAM）。通过傅里叶红外光谱（FTIR）及溶液稳定性测试对G-CPAM的结构和稳定性进行了表征，探讨了DMC及GMA单体用量对G-CPAM的性能及施胶后纸张的物理性能的影响，利用热失重分析仪（TGA）、X射线光电子谱（XPS）以及纸张施胶前后的FTIR测试对G-CPAM的自身交联与纸张性能增强机理进行了研究。结果表明：当DMC用量为质量分数20%，GMA用量为质量分数13%时，制备得可交联环氧阳离子聚丙烯酰胺，此时聚合物溶液平均粒径为176.9nm，黏度为143mPa·s，分子量为63204，且在150℃下稳定存在。 G-CPAM添加量为质量分数1.6%，进行浆内施胶，纸张干、湿抗张指数分别为58.29N·m/g和17.75N·m/g，环压强度指数为11.10N·m/g，撕裂指数为12.41mN·m²/g，纸张物理性能增强明显。

Synthesis and application of self-crosslinking cationic acrylamide copolymer

A crosslinkable epoxy-cationic polyacrylamide (G-CPAM) was prepared by aqueous copolymerization with acrylamide (AM) using methacryloyloxyethyltrimethylammonium chloride (DMC) as cationic monomer, glycidyl methacrylate (GMA) as crosslinking monomer and propylene glycol methyl ether as dispersant. The structure and stability of G-CPAM were characterized by Fourier transform infrared spectroscopy (FTIR) and solution stability tests. The properties of DMC and GMA monomers on the properties of G-CPAM and the physical properties of paper after sizing were discussed. The influence of performance was studied by using thermal weight loss analyzer (TGA), X-ray photoelectron spectroscopy (XPS) and FTIR test before and after paper sizing. The mechanism of G-CPAM self-crosslinking and paper performance enhancement was analyzed. The results showed that when the amount of DMC was 20% and the amount of GMA was 13%, a crosslinkable epoxy-cationic polyacrylamide was prepared. At this time, the average particle diameter of the polymer solution was 176.9nm with viscosity of 143mPa·s, molecular weight of 63204 and stable at 150℃. According to the ratio of G-CPAM to fiber mass ratio of 1∶0.016, the dry and wet tensile indexes of the paper after sizing in the pulp were 58.29N·m/g and 17.75N·m/g, respectively. The ring compressive strength index was 11.10N·m/g and the tear index was 12.41mN·m²/g, which significantly enhanced the physical properties of the paper.