FIELD: chemistry.
SUBSTANCE: invention relates to water-absorbing materials and products from them. Claimed are versions of water-absorbing material in form of particles, including as main component water-absorbing polymer, which has net structure from links, obtained from unsaturated carboxylic acid and/or its salt, which is obtained by surface sewing processing. Water-absorbing material of claimed invention contains residual monomer in amount not higher than 500 p/mln, and residual monomer index value is not higher than 0.30. Claimed method of obtaining water-absorbing material includes obtaining of hydrogel polymer by means of polymerisation of water solution of monomer which includes unsaturated carboxyl acid and/or its salt in presence of sewing agent; obtaining water-absorbing polymer precursor which represents powder and includes particles which have size from 300 to 850 mcm and particles which have size less than 300 mcm as main components; drying of said hydrogel polymer with further crashing and classification for determining distribution by particle size; obtaining water-absorbing polymer by heating mixture of mentioned water-absorbing polymer precursor and surface sewing agent, which can form ester bond on water-absorbing polymer precursor surface; addition to water-absorbing polymer of water solution, which includes sulphur-containing reducing agent, by means of dispersion, and heat processing of mixture of water-absorbing polymer and water solution in air flow at temperature not lower than 40°C, but not higher than 120°C. Also claimed is absorbing product which includes claimed water-absorbing material.
EFFECT: elaboration of water-absorbing material which has inessential amount of residual monomer, inessential change of residual monomer amount in range of particle distribution by size and suitable absorptive properties, applicable for sanitary-hygienic material production; and method of obtaining it.
15 cl, 3 tbl, 8 ex
