FIELD: chemistry.
SUBSTANCE: invention relates to a process for sulphation and phosphorylation of a cellulose substrate for imparting anti-flame properties to the substrate, comprising the following steps: i) providing a cellulose substrate; ii) preparing a sulphation and phosphorylation solution, preferably under heated conditions, the sulphation and phosphorylation solution comprising water, ammonium sulphamate, urea and at least one compound of formula (I) PO(OH)2-R-PO(OH)2 (I), wherein R is a linear or branched, substituted or unsubstituted C1-10, preferably C1-5 an alkyl group; group N(R1); group R2N(R3)R4; R1 is H, linear or branched, substituted or unsubstituted C1-5, preferably C1-3 an alkyl group; R2 and R4 independently represent a linear or branched, substituted or unsubstituted C1-5, preferably C1-3 an alkyl group; R3 is a linear or branched, substituted or unsubstituted C1-5, preferably C1-3 alkyl group; group R5N(R6)R7; R5 and R7 independently represent a linear or branched, substituted or unsubstituted C1-5, preferably C1-3 an alkyl group; R6 is a linear or branched, substituted or unsubstituted C1-5, preferably C1-3 an alkyl group; group R8N(R9)R10; R8, R9 and R10 independently represent a linear or branched, substituted or unsubstituted C1-5, preferably C1-3 an alkyl group; provided that the number of -PO(OH)2 groups the general formula (I) is no more than 5; iii) immersing the cellulose substrate in the sulphation and phosphorylation solution; iv) extracting the cellulose substrate from the sulphation and phosphorylation solution; v) maintaining the cellulose substrate at a temperature of 110 to 175 °C for a period of time between 1 minute and 3 hours, obtaining at the end a sulphated and phosphorylated cellulose substrate with anti-flame properties. Invention also relates to the use of phosphoric acid of formula (I) in this process as a sulphation catalyst and a phosphorylating agent.
EFFECT: method for sulphation and phosphorylation of a cellulose substrate to impart anti-inflame properties to said substrate is disclosed.
15 cl, 6 dwg, 7 tbl
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Authors
Dates
2018-03-28—Published
2014-08-04—Filed