Preparation method of viscosity-reduction type polycarboxylate water reducer
A technology of viscous polycarboxylic acid and water reducer, which is applied in the field of concrete admixtures in building materials, can solve the problems of high viscosity, achieve high dispersion, obvious viscosity reduction effect, and good adaptability
Inactive Publication Date: 2014-06-18
NANJING RUIDI HIGH TECH
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The invention discloses a preparation method of a viscosity-reduction type polycarboxylate water reducer, which belongs to the field of concrete admixtures. The water reducer is prepared from random polyoxyalkyl ether unsaturated acid ester, unsaturated modified polyoxyethylene ether, unsaturated acid alkyl ester, and (methyl) acrylic acid, by means of copolymerization with an aqueous solution and then adding alkali for neutralization, under the presence of an initiator and a molecular weight regulator. By a certain quantity of hydrophobic units and hydrophobic groups which are introduced into and controlled in carboxylic acid copolymer molecule structures, the viscosity of a cement-based material is reduced under the presence of the water reducer. The water reducer prepared by the method has the advantages of high viscosity reducing effect, high dispersibility, good adaptability to cement, and the like; the water reducer is especially applicable to preparation of high-strength concrete, self-compacting concrete, low-water-binder-ratio high-dosage mineral admixture concrete, and the like.
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