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METHOD OF CONTROL OF POLYMER PARTICLES DISTRIBUTION ON SIZES IN PROCEEDING OF WATER POLYMER DISPERSION, WATER POLYMER DISPERSION AND ITS APPLICATION
METHOD OF CONTROL OF POLYMER PARTICLES DISTRIBUTION ON SIZES IN PROCEEDING OF WATER POLYMER DISPERSION, WATER POLYMER DISPERSION AND ITS APPLICATION
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机译:在水分散,水分散过程中控制颗粒尺寸的方法及其应用
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摘要
FIELD: chemistry.;SUBSTANCE: method of controlling the size distribution of polymer particles formed during the preparation of the aqueous polymer dispersion is described; it comprises: preparing an aqueous solution of a polysaccharide which comprises: (a) 10 to 40 wt % of a polysaccharide containing a free hydroxyl group such as starch, polymerization in a solution of the polysaccharide in the presence of a water-soluble oxidation-reduction system for crosslinking by grafting; (B) from 30 to 60 wt % of at least one optionally substituted styrene, (c) from 60 to 30 wt % of at least one C1-C4 alkyl (meth) acrylate, (d) from 0 to 10 wt % of other ethylenically unsaturated copolymerizable monomers, wherein the sum of (a)+(b)+(c)+(d) is 100%. The polysaccharide is an anionic starch derivative, and the size distribution of the polymer particles obtained is controlled by adjusting the viscosity of the polysaccharide solution before polymerization to a level of 10 mPaSec⋅, with a solid content of 15%, as measured at 23°C using a Brookfield LVDV viscometer with a spindle 18 at 60 rpm. An aqueous polymer dispersion for use in the pulp and paper industry is also described.;EFFECT: preparation of an aqueous polymer dispersion containing small particles, with a narrow size distribution.;15 cl, 1 tbl, 7 ex
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