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Three-arm efficient polycarboxylic acid water reducing agent and preparation method thereof

A technology of polycarboxylate and water reducer, which is applied in the field of polycarboxylate high-efficiency water reducer, and can solve the problems of three-arm polycarboxylate water reducer with unclear molecular structure, low water reducing rate, and poor slump retention performance.

Inactive Publication Date: 2016-11-09
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, we synthesized a polycarboxylate superplasticizer with a three-arm structure by using atom transfer radical polymerization, a new polymerization method, which not only overcomes the low water reducing rate and slump retention performance of conventional polycarboxylate superplasticizers The shortcomings of poor mud resistance and poor mud resistance have also solved the problem of unclear molecular structure of the three-arm polycarboxylate superplasticizer prepared by traditional free radical polymerization, thereby revealing the relationship between the molecular structure of the superplasticizer and its performance. The polycarboxylate superplasticizer provides a theoretical basis

Method used

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  • Three-arm efficient polycarboxylic acid water reducing agent and preparation method thereof
  • Three-arm efficient polycarboxylic acid water reducing agent and preparation method thereof

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Effect test

Embodiment 1

[0031] (1) Add 1 g of small molecule initiator, 19.63 g of tert-butyl acrylate, and 0.643 g of PMDETA to a 50 mL single-necked bottle, stir and dissolve, and complete three freezing, vacuuming, and thawing processes under nitrogen protection, and add 0.266 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 is finished, separate and dry under vacuum to obtain the polymer product I.

[0032] (2) Add 3.87 g of polymer I, 14.86 g of TPEG2400, 0.13 g of PMDETA, and 17.83 g of anisole into the reactor, stir and dissolve, and complete three times of freezing, vacuuming, and thawing under the protection of nitrogen, and add 0.054 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 ...

Embodiment 2

[0035] (1) Add 1 g of small molecule initiator, 19.63 g of tert-butyl acrylate, and 0.643 g of PMDETA to a 50 mL single-necked bottle, stir and dissolve, and complete three freezing, vacuuming, and thawing processes under nitrogen protection, and add 0.266 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 is finished, separate and dry under vacuum to obtain the polymer product I.

[0036] (2) Add 4.07 g of polymerization product I, 15.344 g of TPEG600, 0.137 g of PMDETA, and 18.413 g of anisole into the reactor, stir and dissolve, and complete three times of freezing, vacuuming, and thawing under the protection of nitrogen, and add 0.057 g of bromide Cuprous, 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, it is separated and dried ...

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Abstract

The invention relates to a three-arm efficient water reducing agent and a preparation method thereof, and belongs to the technical field of building concrete additives. The efficient water reducing agent is prepared through the step that an AB-type double-block copolymer of a three-arm structure is obtained through step-by-step polymerization by adopting three atom transferring radical polymerization reaction steps. The water reducing agent has the advantages of being controllable in chemical structure and molecular weight, narrow in molecular weight distribution and simple in process, is high in water reducing rate and good in slump retaining property, can obviously improve the concrete flowability and is low in sensitivity degree to mud. Compared with a traditional comb-shaped polycarboxylic water reducing agent, the problems that the polycarboxylic water reducing agent is sensitive to the mud in concrete, and the performance is reduced due to existence of the mud can be solved to a certain degree, and the three-arm efficient water reducing agent is especially suitable for the concrete with the high mud content.

Description

technical field [0001] The present invention relates to the technical field of a polycarboxylic acid high-efficiency water-reducer, in particular to a high-efficiency water-reducer with excellent performance synthesized by a new preparation method, that is, it is prepared by atom transfer radical polymerization using acrylate and macromonomer The specific preparation method of the three-arm high-efficiency water reducer. 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, the polycarboxylate superplasticize...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F293/00C04B24/26C04B103/30
CPCC08F293/005C04B24/26C04B2103/302
Inventor 裴梅山闫孝伟
Owner UNIV OF JINAN
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