2 results about "Retention rate" patented technology

The invention provides a binary retention system for a spherical polyelectrolyte brush for improving the retention rate of paper pulp. The binary retention system is composed of a cationic spherical polyelectrolyte brush and anionic polyacrylamide, wherein the cationic spherical polyelectrolyte brush regards SiO2 as an inner core and a copolymer of acrylamide and methacryloyloxyethyl trimethyl ammonium chloride as an outer brush. The invention further provides a method for improving the retention rate by using the binary retention system. The method comprises: sequentially adding the binary retention system composed of the cationic spherical polyelectrolyte brush and anionic polyacrylamide into scattered paper pulp to improve the retention rate of the slurry. The cationic spherical polyelectrolyte brush provided by the invention has high symmetric or quasi-symmetric structures, so that the anti-shear ability is relatively strong. The system has both the characteristics of a highly branched structure and high charge density and is easily to induce flocculation in high speed papermaking so as to improve the retention performance of a modern papermaking system. The binary system adopted by the invention remarkably improves the retention rate of the paper pulp and is simple and convenient to operate and less in use level of auxiliaries.