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为了增强纸张中纤维与填料之间的结合力,采用淀粉-脂肪酸复合物形成法制备了淀粉-填料复合物。这种复合物以造纸填料的形式来提高纸张的物理性能、填料的留着率以及施胶效果。实验在不同温度下测定了淀粉-脂肪酸复合物在水中的溶解性能。结果表明,当水温低于70℃时,淀粉-脂肪酸复合物的溶解度很低,使其很容易包覆到高岭土表面,以改善高岭土与纤维之间的结合力。与只添加高岭土相比,在手抄片中加入高岭土-淀粉复合物可使纸张强度提高1～2倍左右。在使用未改性高岭土时,随着高岭土含量的增加,手抄片的z向抗张强度降低,但是使用淀粉-脂肪酸复合物改性填料时,手抄片的z向抗张强度却随着高岭土含量的增加而增加。实验还发现,复合物中脂肪酸的存在可以提高手抄片的防水性能,这有益于造纸过程中的施胶。实验还利用扫描电镜对填料的分布以及淀粉-脂肪酸复合物与纤维之间的黏合特性进行了研究。
In order to enhance the binding force between fiber and filler in paper, starch-filler composite was prepared by starch-fatty acid complex formation method. This compound enhances the physical properties of the paper, the retention of the filler, and the sizing effect in the form of papermaking filler. The solubility of starch-fatty acid complex in water was determined experimentally at different temperatures. The results showed that when the water temperature is below 70 ℃, the solubility of starch-fatty acid complex is very low, making it easily coated onto the surface of kaolin to improve the bonding between kaolin and fiber. Compared with adding kaolin only, adding kaolinite-starch compound in the hand sheet can increase the strength of the paper about 1 ~ 2 times. With the unmodified kaolin, the z-direction tensile strength of hand-made sheets decreases with increasing kaolin content, but the z-direction tensile strength of hand-made sheets increases with the use of the starch-fatty acid complex- Kaolin content increases. Experiments also found that the presence of fatty acids in the complex can improve the water-repellency of hand sheet, which is good for sizing in the papermaking process. The experiment also used scanning electron microscopy to study the distribution of the filler and the binding properties between the starch-fatty acid complex and the fiber.