Reduction and early strength polymer additive

A polymer and admixture technology, applied in the field of polycarboxylate high-performance water-reducing agent, shrinkage-reducing early-strength polymer admixture, can solve the problems of lack of availability and reducing concrete shrinkage, and achieve reduction of concrete shrinkage, shrinkage cracking, The effect of speeding up the hydration reaction

Inactive Publication Date: 2011-01-05
SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the polycarboxylate superplasticizer of this structure does not have the ability to reduce concrete shrinkage

Method used

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  • Reduction and early strength polymer additive
  • Reduction and early strength polymer additive
  • Reduction and early strength polymer additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Add 170.0 g of A-1, 143.9 g of water, and 5.0 g of 30% hydrogen peroxide into a 500 ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and stir to raise the temperature to 65°C. At the same time, 41.5g vitamin C aqueous solution (obtained by dissolving 0.5g vitamin C and 1.0g thioglycolic acid in 40.0g water) and 110.0g monomer aqueous solution (dissolving 14.0g B-1 and 16.0g C-1 in 80.0g water Obtained), the dropping time was controlled at 210 minutes and 180 minutes respectively, and the reaction temperature was controlled at 63~67°C. After the dropwise addition, keep the temperature at 63-67°C for 30 minutes to complete the polymerization reaction. After the heat preservation is completed, lower the temperature to below 50°C and add 29.6g of 30% NaOH aqueous solution to obtain the polymer additive PC-1 of the present invention with a solid content of 42.3% and a weight average molecular weight of 42,400.

Embodiment 2

[0047] Add 184.0 g of A-2 and 135.5 g of water into a 500 ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and stir to raise the temperature to 80°C. At the same time, 42.0g aqueous sodium persulfate solution (obtained by dissolving 2.0g sodium persulfate in 40.0g water), 21.5g aqueous solution of 3-mercaptopropionic acid (obtained by dissolving 1.5g 3-mercaptopropionic acid in 20.0g water) and 96.0 g monomer aqueous solution (obtained by dissolving 6.0g B-2, 8.0g C-1, and 2.0g C-2 in 80.0g water), the dropping time is controlled at 180 minutes, 150 minutes, and 150 minutes respectively, and the reaction temperature is controlled at 78~82℃. After the dropwise addition, keep the temperature at 78-82°C for about 60 minutes to complete the polymerization reaction. After the heat preservation is completed, lower the temperature to below 50° C. and add 21.0 g of 30% NaOH aqueous solution to obtain the polymer admixture PC-2 of the present inventi...

Embodiment 3

[0049] Add 176.0 g of A-3, 131.4 g of water, and 10.0 g of 30% hydrogen peroxide into a 500 ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and stir to raise the temperature to 65°C. At the same time, 41.6g vitamin C aqueous solution (obtained by dissolving 1.0g vitamin C, 0.6g 3-mercaptopropionic acid in 40.0g water) and 104.0g monomer aqueous solution (obtained by dissolving 6.0g B-1, 10.0g C-1, 4.0 g C-3 and 4.0 g D-1 were dissolved in 80.0 g water), the dropping time was controlled at 300 minutes and 270 minutes respectively, and the reaction temperature was controlled at 63-67°C. After the dropwise addition, keep the temperature at 63-67°C for 30 minutes to complete the polymerization reaction. After the heat preservation is completed, lower the temperature to below 50° C. and add 37.0 g of 30% KOH aqueous solution to obtain the polymer admixture PC-3 of the present invention, which has a solid content of 43.8% and a weight average mole...

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Abstract

The invention discloses a reduction and early strength polymer additive which is obtained by copolymerizing 60-95 percent of monomer A, 1-10 percent of monomer B, 3-16 percent of monomer C and 0-30 percent of monomer D in an aqueous solution at 50-100 DEG C in the presence of an initiator and a chain transfer agent. The polymer additive has the advantages of high water reduction rate, high early strength, low shrinkage, and the like when used for mortar or concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and relates to a shrinkage-reducing early-strength polymer admixture, in particular to a polycarboxylate high-performance water reducer capable of reducing concrete shrinkage and improving concrete early strength. Background technique [0002] Polycarboxylate high-performance water reducer is called the third-generation concrete superplasticizer, which has the advantages of low dosage, high water reducing rate, large degree of freedom in molecular structure design, and environmental friendliness. It has become a concrete admixture in the 21st century Research hotspots and development priorities in the field. However, at present, the research direction of polycarboxylate high-performance water reducers at home and abroad is mainly focused on the research and development of polycarboxylates with high water reducing rate and high slump retention ability, and there is a lack of research o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C08F290/06
Inventor 冯中军傅乐峰郑柏存
Owner SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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