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An early-strength type polycarboxylic acid water reducer and a preparing method thereof

A technology of polycarboxylic acid and water reducing agent, which is applied in the field of concrete admixtures, can solve the problems of single species and inability to meet engineering diversification, and achieve the effects of simple preparation process, easy control of reaction and high slump

Inactive Publication Date: 2015-07-08
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current variety of polycarboxylate superplasticizers is relatively single, which cannot meet the diverse needs of engineering.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add 60 parts of water and 40 parts of methallyl polyoxyethylene ether to the reaction bottle, stir and heat to 60 OC, add 0.5 parts of hydrogen peroxide, then dropwise add 11 parts of maleic anhydride, 2.2 parts of acrylamide, 20 parts of aqueous solution of 0.2 parts of sodium methacryl sulfonate and 0.5 parts of ascorbic acid are added dropwise for 1 hour. After the drop is completed, the temperature is raised to 70°C and reacted for 1.5 hours. After the reaction, the temperature is lowered to normal temperature to obtain polycarboxylic acid Aqua.

Embodiment 2

[0017] Add 60 parts of water and 60 parts of methallyl polyoxyethylene ether to the reaction bottle, stir and heat to 50 OC, then add 1.2 parts of tert-butyl hydroperoxide, then dropwise add 6.4 parts of maleic anhydride, 4.3 parts 10 parts of aqueous solution of acrylamide, 1.1 parts of sodium allyl sulfonate, and 1.4 parts of sodium bisulfite are added dropwise for 1.5 hours. After the drop is completed, the temperature is raised to 60°C and reacted for 1.5 hours. After the reaction is completed, the temperature is lowered to normal temperature. A polycarboxylate water reducer is prepared.

Embodiment 3

[0019] Add 60 parts of water and 50 parts of methallyl polyoxyethylene ether into the reaction bottle, stir and heat to 50 OC, add 1.0 parts of hydrogen peroxide, then dropwise add 4.1 parts of maleic anhydride, 6.2 parts of acrylamide, 10 parts of aqueous solution of 1.9 parts of sodium styrene sulfonate and 0.4 parts of sodium sulfite are added dropwise for 2 hours. After the drop is completed, the temperature is raised to 70°C and reacted for 1 hour. After the reaction, the temperature is lowered to normal temperature to obtain a polycarboxylate superplasticizer .

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PUM

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Abstract

The invention discloses an early-strength type polycarboxylic acid water reducer and a preparing method thereof in the technical field of concrete additives. The preparing method adopts methyl allyl polyethenoxy ether, maleic anhydride and acrylamide as monomers and includes adding an oxidant, a reductant and a chain transfer agent, and performing copolymerization in water. The prepared water reducer has characteristics of good slump loss resistance and good cement adaptability, and has obvious early-strength reinforcing effects. Adjustment of the pH value by using an alkaline solution is not needed in a preparing process. The process is simple and easy in operation.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, and in particular relates to an early-strength polycarboxylate water reducer and a preparation method thereof. Background technique [0002] High-efficiency water reducers play an increasingly important role in the concrete mixing process, especially in the construction of major projects. Polycarboxylate superplasticizer is a new type of superplasticizer after naphthalene superplasticizer and melamine superplasticizer. It has the advantages of low dosage, high water reducing rate and good slump retention. specialty. However, the current variety of polycarboxylate superplasticizers is relatively single, which cannot meet the diverse needs of engineering. With the further development of engineering construction, new requirements are put forward for the coagulation-accelerating and early-strength effects of concrete superplasticizers. Therefore, synthesizing a polycarboxylate water-reducer with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/56C08F222/06C08F4/40C08F2/38C04B24/26C04B103/30
Inventor 温笑菁王言博田宇魏静曹海涛任洁
Owner NORTHEASTERN UNIV
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