Amphoteric polyacrylamide for dry-strengthening agent for paper

Polyacrylamide (hereinafter referred to as PAM) since in the 1950 of the 20th century since the introduction of paper industry as an additive for more than 40 years of history, is a water-soluble synthetic polymer used in the largest, most widely used variety, called the standard "paper additives". Using different polymerization process, the introduction of different functional groups can be obtained by a series of different molecular weight and charge density of the polymer, as consumption of polyacrylamide in paper industry large industry in the dry strength improvement, widely used filler retention, since water clarification. Used for improving dry strength using anionic polyacrylamide. In recent years due to waste paper regeneration pulp of application, slurry and the since water system in the miscellaneous ion of content relative improve, on paper of copy made effect great, so high polymer molecular chain Shang both with Yin ion function mission, and with Yang electronic function mission of gender polypropylene n amine of development increasingly by people of attention, especially due to it and cost low of cation starch of collaborative effect, in using cost aspects has larger advantage.