废皮胶原蛋白基造纸表面施胶剂的制备、表征及应用性能研究

Preparation,characterization and application performance of the surface sizing agent for papers based on collagen from leather wastes

采用胰蛋白酶对废皮工业明胶进行水解制备胶原蛋白,然后与马来酸酐进行预反应。以过硫酸铵为引发剂,马来酸酐-胶原蛋白与苯乙烯、丙烯酸乙酯单体进行接枝共聚合反应,水相合成出一种新型造纸表面施胶剂。通过单因素实验,以产物接枝率和沉淀率作为指标,对施胶剂的制备条件进行优化;采用傅立叶红外光谱仪、激光粒度仪和X光衍射仪对产物进行表征,并研究产物的施胶应用性能。结果表明,水解胶原蛋白与苯乙烯和丙烯酸乙酯发生了接枝反应,接枝率为60%左右。产物粒径分布较均匀,平均粒径为0.318μm。产品单独施胶,纸张抗张指数、环压指数和抗水性分别提高了35.27%,95.43%和25.36%;产品与苯丙乳液复配施胶,最佳配比为8∶2。

The gelatin was hydrolyzed by using trypsin to prepare collagen,and then the collagen reacted with MA.Finally,ammonium persulfate was as initiator,MA-collagen reacted with styrene and ethyl acrylate monomer,a new surface sizing agent for papers was prepared in acquous phase.The grafting rate and precipitation rate of the product were as indexes,the preparation conditions of product were optimized by single factor experiments.The product was characterized by FT-IR,particle size analyzer and XRD.The sizing performance of the product was also studied.The results showed that hydrolyzed collage reacted with styrene and ethyl acrylate monomer.The grafting rate was about 60%.The size distribution of product was uniform and the average diameter was 0.318μm.The product was used in paper sizing alone,the tensile strength,ring crush strength and water resistance of the papers increased respectively for 35.27%,95.43% and 25.36%.When the product and styrene acrylic emulsion together were used in the sizing of paper,their optimal proportion was 8∶2.