METHOD OF PRODUCING FIRE-RESISTANT TEXTILE MATERIALS FROM CELLULOSE AND SYNTHETIC FIBRES Russian patent published in 2020 - IPC C09K21/14 D06M15/431 

FIELD: chemistry.

SUBSTANCE: invention relates to chemical technology of textile materials and a method of producing fire-resistant textile materials from cellulose and synthetic fibres. Method involves applying a solution of a phosphonium compound and a nitrogen-containing compound onto tissue, obtaining a phosphorus-containing polymer on the fabric by reacting a phosphonium compound and a nitrogen-containing compound to form a linear-structure oligomer precondensate, fabrication of a cross-linked polymer on the fabric of a precondensate reaction with a cross-linking composition, oxidising the cross-linked polymer to convert at least a portion of the phosphorus atoms in the cross-linked polymer into pentavalent phosphorus atoms and washing the fabric with water, pH of water extract of fabric without starch is 7 ± 0.5, phosphorus-containing polymer is obtained by its impregnation with aqueous solution of tetra-hydroxymethyl phosphonium chloride and urea with concentration of 500 g/l, squeezed, dried at 110 °C to residual moisture content of 10 % and cooled, filling the fabric in roller mechanism of drawing and tension inside ammonium chamber and obtaining a cross-linked polymer - polymer by reaction of precondensate with cross-linking composition by treatment of wet fabric with 40–60 % ammonia mixture and air at temperature of 25÷40 °C with simultaneous tension for fabrication of particles of cross-linked polymer with size of 100–300 nm on fabric, oxidation is carried out by immersion of cloth coated with cross-linked polymer, into an aqueous solution of hydrogen peroxide with concentration of 150 g/l at temperature of 25 ± 5°C to obtain on the fabric a cross-linked polymer - a condensation product of tetra-hydroxymethyl phosphonium chloride and urea, which contains a repeating trimethylene phosphine oxide group, longitudinally bonded with ureido groups and cross-linked with amino groups, and after tissue washing with water, it is additionally treated in aqueous solution of sodium bisulphite with concentration of 110 ÷120 g/l and final washing with water.

EFFECT: invention provides improved indices of human protection against harmful effect of open flame and reduced irritant action of tissue on human skin during its prolonged contact with material of overalls.

1 cl, 3 dwg