14
2022
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03
Application of retention and drainage aids in papermaking
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Paper making retention and drainage aid is a water-soluble branched chain organic polymer. The function of paper making retention and drainage aid is to increase the retention rate of pulp when it is online, and it has excellent retention effect on small fibers and fillers (such as calcium carbonate, titanium dioxide, and kaolin), with obvious pulp saving. Enhance water filtration and reduce dehydration energy consumption during forming, pressing, and drying processes. Thus increasing paper production, reducing energy consumption, and reducing costs. Moreover, it also has the effect of increasing the strength of wet and dry paper, which can maintain the stability of wet end chemical conditions, improve the uniformity of the paper and the physical properties of the paper. Due to the reduction of small fibers and fillers in the effluent, the load of wastewater treatment has also been reduced. At present, the main retention and drainage aids for papermaking are polyacrylamide, as well as starch modified products. Polyacrylamide is mostly imported cationic products, including powder and lotion. Lotion products account for half of the country at present due to their good retention and drainage effects, good liquidity and fast dissolution rate. There are two kinds of lotion: water in oil and water in water. The performance of water in oil products is good. The only weakness is that they contain mineral oil, which is high in cost. Moreover, the oil enters the pulp and causes secondary pollution, which may also affect the quality of paper. Water in water lotion products also have the advantages of water in oil lotion, and because the production is dispersed in the water phase, the cost is low. No pollution, without affecting the quality of the finished paper. Water in water products are widely used abroad. It is also gradually being applied domestically.
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