GYPSUM BOARDS WITH IMPROVED INTER-LAYER ADHESION Russian patent published in 2013 - IPC C04B28/14 

FIELD: chemistry.

SUBSTANCE: invention relates to production of gypsum boards, namely to gypsum suspension for production of gypsum boards with improved inter-layer adhesion. Gypsum suspension for production of gypsum boards with improved inter-layer adhesion includes: gypsum, oxidised starch, foam-generating substance, plasticiser, paper pulp, water and additionally alkaline starch paster with concentration by finished starch from 1% to 25%, in quantity from 0.001% to 0.2% of gypsum weight. Method of production of gypsum boards with improved inter-layer adhesion includes the following stages: preparation of alkaline starch paster, preparation of water suspension of paper pulp, dosing all components of gypsum suspension into mixer, mixing gypsum suspension components, formation of gypsum cloth of gypsum board with required edge shape and thickness, chopping obtained gypsum board cloth into straps, drying in drying chamber, cutting and facing lines into required length.

EFFECT: improved adhesion of board to gypsum core, increase of strength characteristics of gypsum board sheets without increase of 1 m² weight.

4 cl, 3 tbl, 2 ex