Improvement in the preparation of superabsorbent powder by inverse suspension polymerization of acrylic monomers.

摘要

For the preparation of a polyacrylic superabsorbent powders for the water and the aqueous liquids by polymerization in inverse suspension, which procedure is carried out according to the formation of a polymer gel by a first polymerization of a monomer in inverse suspension, followed by polymerization of a second monomer charge is absorbed into this gel is used, the polymerizable surfactants of formula (br / (see appended drawing in bopi) & br / & & br / in which r1 is a hydrocarbon chain with at least 9 carbon atoms and r2, a polymerizable group, acryloyl, methacryloyl or maleoyl radical. & br / the absorption of the monomer by the gel can be carried out at temperatures close to 45degré c. this results in a considerable advantage with regard to the pipe and to the economics of the process.