Papermaking retention and filter aid
In the paper industry, many papers need to add a certain amount of filler to improve some properties of paper. Bentonite for papermaking is made by selecting high-quality bentonite raw materials and scientifically modifying. It has multiple properties such as large specific surface, high dispersion, electronegativity and adsorption, making it widely used in the paper industry and showing considerable superiority.
The binary system composed of bentonite and cationic polymers (mainly cationic polyacrylamide and cationic starch) for papermaking is a new type of retention and filter aid. Added cationic polymer of high molecular weight and low charge density to pulp, adsorbed on the pulp fiber by electrostatic action, and caused by bridging the initial flocculation of the paper stock, the initial flocculent decomposed into small floccules by high shear, and then exposed more cationic units for the negatively charged bentonite. At this time the bentonite that can provide a negative center is added to react with the positively charged floc to form a high-density floc (flocs that are prone to water loss), through the above effects not only increase the retention rate of fine fibers and fillers, but also improve the water filtration performance of the slurry.
1. It has a good retention effect on fine fiber, filler and wet-end chemical additives;
2. Maintain stable wet conditions, improve paper uniformity and paper physical properties;
3. Strengthen water filtration and reduce the dewatering energy consumption of molding, pressing and drying processes;
4. Reduce the concentration of white water, which is conducive to the closed circulation of white water and improves the efficiency of white water recovery;
5. Applicable in the range of pH 5.5~10;
6. Increase the output of the paper machine, improve the running performance of the paper machine, reduce costs, improve economic benefits, and be harmless to the environment.
Method of Application:
First, the solid powder product is dispersed in water to make a slurry with a concentration of less than 3%, and then the slurry is directly added to the pulp. When used with cationic polymers, cationic polymers are recommended to be added before the pulp pump or pressure screen, and bentonite is added before the headbox after the pressure screen.