METHOD OF PRODUCING GLUING ENHANCER Russian patent published in 2020 - IPC D21H21/16 

FIELD: paper.

SUBSTANCE: invention relates to pulp and paper industry, specifically to production of reinforcing additive and production of hydrophobic paper containing reinforcing additive. Method of producing the reinforcing gluing additive involves the following stages: I) combining lignin-containing oil and aqueous solution of gelated cationic polysaccharide and optionally water, II) mixing the lignin/polysaccharide mixture at temperature of 40–100 °C, preferably 90–95 °C, until mixture changes colour from grey-white to brown. Method of producing hydrophobic paper involves a step of adding a reinforcing gluing additive and a hydrophobisating agent to a suspension of lignocellulosic pulp on the wet side of the paper making process.

EFFECT: invention enables to obtain a reinforcing gluing additive, reduces consumption of gluing agents when producing hydrophobic paper products, and improves properties of such paper products.

16 cl, 7 tbl, 6 dwg