造纸分散剂
造纸分散剂的介绍：
在抄纸过程中，纸浆中的纸纤维和填料等具有疏水性，有絮凝成团的趋势，往往难以制得性能均匀，强度符合要求的纸张。需要加入一种助剂增加纸浆的粘度，以利于纤维和填料的均匀分散，使抄出的纸均匀平滑有柔性无洞眼，使抄纸性能稳定，抄纸时不易断纸和起粉末，同时能提高纸品的拉力及干湿强度并节约纸浆。加入的这种助剂就叫造纸分散剂。
造纸分散剂有很多种。主要有PAM、淀粉改性等。并且它应该具有热解性、随温度升高其粘度很快下降的特点，从而保证不影响干燥的纸中原有纤维的性能。
阴离子聚丙烯酰胺是水溶性有机高分子聚合物，易溶于水并形成高粘度液体，在低添加量下能促进造纸纤维的良好分散和极佳的纸张成型效果，改善纸浆匀度和纸张的柔软度，还能使纸的强度性能增高。在造纸涂布使用中，造纸分散剂具有分散效率高，涂料粘度稳定、泡沫少、无毒、无腐蚀性，可使涂料固含量提高，且流动性和耐擦洗性好，能保持纸品光泽度，不易变霉。造纸分散剂也可以提高抄造车速，节省打浆时间，降低能源消耗，具有显著的经济效益。阴离子聚丙烯酰胺分子量达到1500万以上，产品溶解性一般在1小时以内，并且产品水溶液具有很好过滤性能，用于各种卫生纸、餐巾纸、白巾纸，也广泛用于文化纸，有光薄页纸和新闻纸的抄造。
造纸分散剂性能特点：
造纸分散剂是一款水油两性、低粘度的分散剂，低量添加后有效解决颗粒漂浮、涂布后洞口生成、提升纸张的平整光滑度；并促进造纸纤维的良好分散、改善纸浆匀度、提高纸张的成型效果、柔软度及强度性能。
造纸分散剂适用范围：
造纸分散剂广泛应用在手帕纸、面巾纸等高档生活用纸和特种纸、滤纸、白板纸等高档工业用纸的纸张生产中。
造纸分散剂使用方法：
造纸分散剂的浓度建议控制在0.5‰-1‰，且添加量不易过大的进行调整。 Introduction of paper dispersants:
In the process of paper making, the paper fibers and fillers in pulp are hydrophobic, flocculating and agglomerating. It is often difficult to produce paper with uniform performance and high strength. It is necessary to add an additive to increase the viscosity of pulp in order to facilitate the uniform dispersion of fibers and fillers, to make the paper evenly smooth and flexible without holes, to make the paper stable, not easy to break and powder when making paper, at the same time, to improve the tensile force and dry-wet strength of paper products and save pulp. The additive is called paper dispersant.
There are many kinds of paper dispersants. There are mainly PAM, starch modification and so on. And it should have the characteristics of pyrolysis and fast decrease of viscosity with the increase of temperature, so as to ensure that the properties of the original fibers in the drying paper are not affected.
Anionic polyacrylamide is a water-soluble organic macromolecule polymer. It is easy to dissolve in water and form high viscosity liquid. It can promote good dispersion of papermaking fibers and excellent paper forming effect at low dosage, improve the uniformity of pulp and the softness of paper, and also increase the strength and properties of paper. In papermaking, the dispersing agent has the advantages of high dispersing efficiency, stable coating viscosity, less foam, no poison and no corrosion. It can improve the solid content of the coating, and has good fluidity and scrubbing resistance. It can keep the gloss of paper and keep it mouldy. Paper dispersant can also improve the speed of papermaking, save beating time and reduce energy consumption, with significant economic benefits. The molecular weight of anionic polyacrylamide is more than 15 million. The solubility of the product is generally less than 1 hour. The aqueous solution of the product has good filtration performance. It is used for various toilet paper, napkin and white napkin. It is also widely used in the manufacture of cultural paper, light paper and newsprint.
Performance characteristics of paper dispersant:
Paper dispersant is a water-oil amphoteric and low viscosity dispersant, which can effectively solve the problem of particle floating, the formation of hole after coating, and improve the smoothness of paper. It also promotes the good dispersion of papermaking fibers, improves the uniformity of pulp, and improves the forming effect, softness and strength of paper.
Scope of application of paper dispersant:
Paper dispersant is widely used in handkerchief paper, tissue paper and other high-grade living paper and special paper, filter paper, white board paper and other high-grade industrial paper production.
 
Method of using paper dispersant:
The concentration of paper dispersant is suggested to be controlled at 0.5 -1, and the dosage can not be adjusted too much