10-01-2019 дата публикации
Номер: US20190010286A1
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The present invention provides a method for preparing a polymer and a use of the polymer. The resulting polymer is used as a dispersant for an aqueous dispersion of a hydraulic binder and/or a latent hydraulic binder, such that water-reducing rate is improved, and suitable control of air content can be achieved, thereby improving the strength of concrete. The method for preparing a polymer includes polycondensation of a polyether macromonomer A of a specific structure, a monomer B and an aldehyde C to obtain the polymer. The monomer B is phenylsulfonic acid, p-/o-aminophenylsulfonic acid, p-/o-hydroxylbenzoic acid, p-/o-aminobenzoic acid, p-/o-hydroxylphenylsulfonic acid, or a phosphoric acid group or phosphorous acid group-containing monomer of a specific structure. A molar ratio of the polyether macromonomer A and the monomer B is 1:(0.5 to 12). 2. The method for preparing a polymer of claim 1 , wherein the polymer has a weight average molecular weight of 4000 to 150000 claim 1 , preferably 8000 to 100000 claim 1 , more preferably 10000 to 40000.3. The method for preparing a polymer of claim 1 , wherein claim 1 ,{'sub': 2', 'f, 'Z is O or O(CH)O, f=1 to 3, more preferably f=1 to 2, most preferably Z is O;'}{'sub': 2', 'f, 'L is (CH), f=1 to 3;'}{'sub': 2', '2, 'Q is C2 to C4 alkylene, preferably C2 to C4 alkylene, more preferably CHCH;'}{'sup': '1', 'Ris H or a C1 to C3 alkyl, more preferably H;'}{'sup': '2', 'Ris H or a C1 to C3 alkyl, more preferably H;'}{'sup': '3', 'Ris a C1 to C3 alkyl, more preferably methyl;'}{'sup': 8', '8, 'X is NRor O, Ris a C1 to C3 alkyl, more preferably methyl or ethyl, most preferably methyl;'}{'sup': 7', '7, 'Y is OH or OR, Ris preferably a C1 to C3 alkyl, more preferably methyl or ethyl, most preferably methyl;'}K is a C1 to C3 alkylene; and{'sup': '5', 'Ris H, COOH or a C1 to C3 alkyl, more preferably H or COOH.'}4. The method for preparing a polymer of claim 3 , wherein the monomer B has a structural formula (IIa) or (IIb) in ...
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