METHOD OF OBTAINING PLASTICISER FOR CONCRETE MIXTURES

摘要

FIELD: chemistry.SUBSTANCE: method of plasticiser obtaining includes sulphonation of phenol production wastes by concentrated sulphuric acid, successive two-stage neutralisation of sulphomass: by sodium metasilicate (silicate module-4) and 15% solution of caustic soda (NaOH). To obtain additive in dry form the following drying of plasticiser solution to 0.5% humidity is provided. Components are taken in the following ratio, wt %: wastes from phenol production by cumene method - 3.0-5.0, concentrated sulphuric acid - 15.0÷18.0, sodium metasilicate - 5.5-8.5, caustic soda - 8.5-13.0, water - the remaining part.EFFECT: reduction of air-involving, increase of density of concrete mixtures and density of products from them.1 tbl