自交联阳离子聚丙烯酰胺纸张增强剂的制备及性能

Preparation and Properties of Self-crosslinking Cationic Acrylamide Paper Strengthening Agent

关键词:  丙烯酰胺  阳离子  浆内施胶  抗张指数

Key Words:acrylamide  cationic  internal sizing  tensile index

摘要:本研究选用丙烯酰氧乙基三甲基氯化铵（DAC）、丙烯酰胺（AM）和甲基丙烯酸缩水甘油酯（GMA）为原料，水和丙二醇甲醚为溶剂，过硫酸铵为引发剂，合成了一种具有强阳离子性的自交联聚合物（MCPAM），并将其应用于浆内施胶。讨论了DAC含量和GMA含量对MCPAM物理化学性质及其对纸张的增强作用，并分析了MCPAM在造纸湿部化学中的作用机理。结果表明，当DAC含量14%，GMA含量2.6%（相对于单体总质量）时，制得MCPAM平均粒径141.6 nm，黏度426.75 mPa·s，阳离子度15.7%，且其浆内施胶效果最佳；当MCPAM添加量为1.6%时，纸张的干抗张指数达98.8 N·m/g，湿抗张指数达19.2 N·m/g，耐折度达134次，撕裂指数达12.1 N·m²/g，与未施胶纸张相比分别提高了68%、300%、346%、35%。

Abstract:Acryloyloxyethyl trimethyl ammonium chloride （DAC）， acrylamide （AM） and glycidyl methacrylate （GMA） were used as raw materials， water and propylene glycol methyl ether were used as solvents， ammonium persulfate was used as initiator to synthesize a kind of self-crosslinking polymer MCPAM with strong cationicity， and its application in the sizing was studied. The effect of DAC and GMA contents on physicochemical properties of MCPAM and its enhancement to paper was discussed， and the mechanism of MCPAM in the wet end chemistry of papermaking was analyzed. The results showed that when the content of DAC in MCPAM was 14% and the content of GMA in MCPAM was 2.6%， the average particle size of MCPAM was 141.6 nm， the viscosity was 426.75 mPa·s， and the cationicity was 15.7%. In addition， its papermaking enhancement effect was the best. When the adding amount of MCPAM was 1.6%， the dry tensile index of the paper could reach 98.8 N·m/g， the wet tensile index could reach 19.2 N·m/g， the folding endurance could reach 134 times， and the tearing index could reach 12.1 N·m²/g， compared with original paper， it was increased by 68%， 300%， 346%， 35%， respectively.