Novel retention and filtration aid system for light paper

The invention discloses a novel retention and filtration aid system for light paper, and belongs to the technical field of pulping and papermaking. The novel ternary retention and filtration aid system consists of polyethylene imine, cationic polyacrylamide and anionic polyacrylamide, wherein the polyethylene imine is added into a high level tank and an external white water tank respectively to shield a large amount of interference anionic garbage in the pulp of the light paper and eliminate the negative effect of the anionic garbage on the sequentially added cationic polyacrylamide, so that the cationic polyacrylamide can fully play a role, more positive charge adsorption sites are reserved for the sequentially added anionic polyacrylamide, and the purpose of improving the retention rate of the pulp of the light paper on a net part is fulfilled; and meanwhile, the ternary retention and filtration aid system also reduces the consumption of the cationic polyacrylamide, the anionic polyacrylamide ...