METHOD OF PREPARING PLASTICIZING ADDITIVE FOR CONCRETE MIX Russian patent published in 2003 - IPC

FIELD: manufacture of building materials. SUBSTANCE: preparation of additive includes sulfuric- acid sulfurization of aromatic hydrocarbons, in particular concentrates of bicyclic aromatic hydrocarbons isolated from liquid gasoline pyrolysis or reforming products, condensation of resulting sulfonic acids with formaldehyde, mixing of condensation product with 50% solution of industrial-grade lignosulfonate, and neutralization of thus obtained mixture with alkali, provided that preferred proportions of above-said condensation product and lignosulfonate solution are 79-94% and 6-22%, respectively. EFFECT: simplified additive preparation technology and improved quality of additive. 2 cl, 2 tbl, 6 ex