Silicate-base aid for paper mfr. - contg. alkali silicate and alkali fluorosilicate, opt. with other alkali salts and polyhydroxy cpds.

摘要

Silicate-base aid for paper mfr. is produced by mixing alkali silicates with alkali fluorosilicates, opt. with alkali carbonates, bicarbonates, fluorides or other salts with strongly polar anions and/or organic polyhydroxy cpds. Beneficial effects of alkali silicates on pulp prepn. (esp. improved dispersion), and the strength of paper are combined with biocidal action and suppression, of slime formation by alkali fluorosilicates in one compsn., having good storage stability and flowability (promoted by alkali carbonates and/or bicarbonates). Desired pH value of the pulp (between 4 and 12) can be attached by selecting a proper ratio of the alkali silicate to the alkali fluorosilicate. Flocking and dehydration are facilitated.