FIELD: paper.
SUBSTANCE: invention relates to paper-making industry. Chemical system for drainage and dewatering under press in production of paper and cardboard includes amphoteric polyacrylamide, inorganic microparticles of silicon-containing material, such as colloidal silicon oxide or bentonite, and cationic coagulant with high charge. Amphoteric polyacrylamide is a copolymer obtained via polymerisation of (meth)acrylamide and 1–80 mol. % of cationic monomers and 0.1–70 mol. % of anionic monomers. Polyacrylamide is characterized by true viscosity lying in range of 6–38 dl/g. Density of charge of cationic coagulant is more than 5 mEq/g, determined at pH 6. Cationic coagulant is selected from coagulants based on aluminium, organic polymers and mixtures thereof.
EFFECT: improved strength properties of paper.
24 cl, 12 tbl, 4 ex
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