FIELD: chemistry; technological processes.
SUBSTANCE: invention relates to a process for the preparation of water-soluble homo- or copolymers comprising (meth)acrylamide, which can be used as a thickener, flocculant, reinforcing material for paper, for oil recovery or for use in the mining industry. Process for the preparation of water-soluble homo- or copolymers is that to the cooled to less than 5°C monomer aqueous solution comprising water, from 25 to 45 % by weight ethylene-unsaturated monomers (A), from 0.1 to 2 % by weight stabilizer (B), azoinitiator (C) with a value of 10 h t1/2 from 40 °C to 75°C, a redox polymerization initiator (D) is added. Aqueous monomer solution has a pH value of <7. Monomer solution is inertized. Next, gel-polymerization of the aqueous monomer solution under adiabatic conditions is carried out. Polymerization start temperature is less than 5°C. Under the influence of heat, the mixture is heated to a temperature of 60°C to 100°C, forming a polymer gel. Resulting polymer gel is dried. At least 70 wt.% of the starting monomers (A) are monoethylene-unsaturated hydrophilic monomers (A1), one of the monomers (A1) being (meth)acrylamide. Sulfur compounds are used as the stabilizer (B), which prevents the destruction of the polymer by molecular oxygen.
EFFECT: invention makes it possible to obtain homo- or copolymers having high viscosity and high molecular weight.
12 cl, 3 dwg, 1 tbl, 13 ex
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| SILICONE-CONTAINING PREPOLYMERS SUBJECTED TO WATER PROCESSING AND VERSIONS OF APPLICATION THEREOF | 2011 |
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