Multi-branched polycarboxylate superplasticizer and preparation method thereof
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A high-efficiency water reducer and polycarboxylate technology, applied in the field of new polycarboxylate high-efficiency water reducers, can solve the relationship that cannot fundamentally reveal the performance of polycarboxylate superplasticizers, polycarboxylate water reducers Problems such as unclear molecular structure, to achieve the effect of clear molecular structure and molecular weight
Active Publication Date: 2016-11-23
UNIV OF JINAN
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Although this method has the characteristics of simple and easy-to-control preparation method, low cost, and no pollution, the molecular structure of the polycarboxylate superplasticizer obtained is not clear, and the molecular structure and performance of the polycarboxylate superplasticizer cannot be fundamentally revealed. Relationship
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Embodiment 1
[0030] (1) Add 0.859 g of small molecule initiator, 17.170 g of tert-butyl acrylate, and 0.757 g of PMDETA to a 50 mL single-necked bottle, stir and dissolve, and complete three freezing-vacuumizing-thawing processes under nitrogen protection, and add 0.066 g Cuprous bromide, stir well and repeat three times to freeze, vacuum and thaw. After thawing, it was placed in an oil bath at 85°C and stirred for 18 h. After the reaction is finished, separate and dry under vacuum to obtain the polymer product I.
[0031] (2) Add 4.068 g of polymer product I, 13.750 g of TPEG2400, 0.035 g of PMDETA, and 16.500 g of anisole into the reactor, stir and dissolve, and complete three freezing-vacuumizing-thawing processes under the protection of nitrogen, and add 0.015g of bromine Cuprous chloride, stir evenly and repeat three times to freeze, vacuum and thaw. After thawing, it was placed in an oil bath at 85°C and stirred for 18 h. After the reaction, it is separated and dried under vacuum ...
Embodiment 2
[0034] (1) Add 0.859 g of small molecule initiator, 17.170 g of tert-butyl acrylate, and 0.757 g of PMDETA to a 50 mL single-necked bottle, stir and dissolve, and complete three freezing-vacuumizing-thawing processes under nitrogen protection, and add 0.066 g Cuprous bromide, stir well and repeat three times to freeze, vacuum and thaw. After thawing, it was placed in an oil bath at 85°C and stirred for 18 h. After the reaction is finished, separate and dry under vacuum to obtain the polymer product I.
[0035] (2) Add 12.396 g of polymer product I, 10.475 g of TPEG600, 0.108 g of PMDETA, and 12.570 g of anisole into the reactor, stir and dissolve, and complete three freezing-vacuumizing-thawing processes under the protection of nitrogen, and add 0.045 g of bromine Cuprous chloride, stir evenly and repeat three times to freeze, vacuum, and thaw. After thawing, it was placed in an oil bath at 85°C and stirred for 18 h. After the reaction, it is separated and dried under vacuu...
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Abstract
The invention relates to a multi-branched polycarboxylate superplasticizer and a preparation method thereof and belongs to the technical field of building concrete admixtures. The preparation method of the multi-branched polycarboxylate superplasticizer is characterized in that an AB type double block copolymer with a multi-branched structure is obtained by adopting three steps of atom transfer radical polymerization reaction through step-by-step polymerization. The superplasticizer has the characteristics of controllable chemical structure, controllable molecular weight, narrower molecular weight distribution and simple process. The superplasticizer is high in water-reducing rate, good in slump retaining property and low in sensitivity to mud; the flowability of concrete can be remarkably improved; dextrin is used as a main raw material, and the superplasticizer is low in cost, pollution-free and renewable; the dextrin is used for synthesizing the superplasticizer, so that the cost is remarkably reduced, and the pollution is avoided. Compared with a traditional comb-shaped polycarboxylate water reducer, the multi-branched polycarboxylate superplasticizer disclosed by the invention has the advantages that the problems that the polycarboxylate water reducer is more sensitive to the mud in the concrete and the performance of the polycarboxylate water reducer is reduced due to the existence of the mud can be solved to a certain degree; the polycarboxylate superplasticizer is particularly suitable for concrete with higher mud content.
Description
technical field [0001] The present invention relates to the technical field of synthesizing a novel polycarboxylate high-efficiency water reducer, in particular to a specific method for preparing a hyperbranched polycarboxylate high-efficiency water reducer by utilizing acrylate and a macromonomer through atom transfer radical polymerization. Preparation. Background technique [0002] Polycarboxylate superplasticizer in the traditional sense is a polymer formed by free radical polymerization of unsaturated monomers containing carboxyl groups and unsaturated monomers containing other functional groups. It is a random copolymer. Its molecular structure is comb-shaped, and it has the characteristics of high water reducing rate, small change in slump over time, and good adaptability to different types of cement. [0003] With the rapid development of the construction industry, polycarboxylate high-efficiency water reducers have gradually exposed a series of shortcomings, mainly...
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