In the paper industry, the papermaking aid polyacrylamide mainly plays three roles: dispersing (dispersant), strengthening (enhancing agent), flocculation (flocculant), flocculation is used to treat wastewater, all of which are understood This time I will mainly talk about how the papermaking aid polyacrylamide is used as a dispersant, Papermaking auxiliary polyacrylamide.
The dissolution process of polyacrylamide as a dispersant: polyacrylamide is also a water-soluble linear and branched organic high molecular polymer with fast dissolution speed, complete dissolution and high viscosity.
The papermaking aid polyacrylamide is used in the production of paper products. It can increase the viscosity of the pulp and effectively disperse the fibers and fillers. Therefore, the paper produced is uniform, smooth, flexible and without holes. The addition of this product can also make the papermaking performance stable. The paper is not easy to break the paper and powder. At the same time, it can also improve the tensile strength and dry and wet strength of paper products and save paper pulp. The paper output rate is increased by 15%, and the speed is greatly improved. The paper dispersant is suitable for all kinds of paper and is widely used in toilet paper.
The mechanism of action of polyacrylamide as a dispersant: The surfactant can make the solid dispersed particles in the suspension be fully wetted and uniformly dispersed by the liquid phase, and minimize the separation and aggregation of the system and the sedimentation speed of the solid particles. To maintain the maximum dynamic stability of the suspension.
Since polyacrylamide contains carboxyl groups in its molecular chain, it has the effect of reducing surface tension and helps water wetting of solids, which is particularly advantageous for the dispersion of fillers and fibers in water.
When the papermaking aid polyacrylamide is added to the slurry, it can form a bi-molecular structure on the surface of the filler and fiber. The extreme of the outer dispersant has a strong affinity with water, which increases the solid particles such as fillers and fibers that are wetted by water. degree. Solid particles such as fibers and fillers are kept away from each other due to electrostatic repulsion, thus achieving a good dispersion effect.
No special smell, other colors may be white or milky white, depending on the batch. In the case of drying for papermaking, the particles are dispersed and non-sticky. In the papermaking field, it is widely used as a retention aid, filter aid, leveling agent and in the same city as the enamide used in papermaking.
The role in papermaking is to improve the quality of paper, improve the dewatering performance of the slurry, increase the retention of fine fibers and fillers, and reduce the consumption of raw materials and environmental pollution. The effectiveness in papermaking depends on its average molecular weight, ionic properties, ionic strength and the activity of other copolymers. Non-ionic polyacrylamide for papermaking is mainly used to improve the filterability of pulp, increase the strength of dry paper, and increase the retention rate of fibers and fillers. Anionic polyacrylamide copolymers are mainly used as dry and wet strengthening agents and retention agents for paper; cationic paper-making polyacrylamide copolymers are mainly used for papermaking wastewater treatment and filter aids, and have a good effect on increasing the retention of fillers. Papermaking auxiliary polyacrylamide, In addition, enamides for papermaking are also used in papermaking wastewater treatment and fiber recycling. In the paper industry, Ciba Specialty Chemicals is used as an industrial application of papermaking additives. The enamide used in papermaking is widely used in the production of cultural paper, newsprint, paperboard and special molded products as a cation retention. It is recommended to add it to the slurry. The addition point should be selected at the post-cut point of the procedure before sheet formation, and the amount is 0.01-0.1% (relative to the dry pulp). Can be used in unit, double and particle retention systems. It can also be used as a polymer flocculant to improve the efficiency of the paper machine recycling system.