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Poly carboxylic acid water reducing agent adopting tartaric acid as chain transfer agent, and preparation method thereof

A technology of polycarboxylate and chain transfer agent, which is applied in the field of concrete water reducing agent, can solve the problems affecting product performance and function of chain transfer agent, achieve high water reducing rate, eliminate health hazards, and avoid high toxicity effects

Active Publication Date: 2013-03-06
天津世纪维鼎科技发展有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

This process uses sodium methacrylate as a chain transfer agent. Although it overcomes the harm of mercaptoacetic acid, mercaptopropionic acid, and mercaptoethanol as chain transfer agents, it has active double bonds and will participate in the polymerization reaction. As the reaction progresses, Affect the function of chain transfer agent, and ultimately affect product performance

Method used

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  • Poly carboxylic acid water reducing agent adopting tartaric acid as chain transfer agent, and preparation method thereof
  • Poly carboxylic acid water reducing agent adopting tartaric acid as chain transfer agent, and preparation method thereof
  • Poly carboxylic acid water reducing agent adopting tartaric acid as chain transfer agent, and preparation method thereof

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Embodiment 1-3

[0025] Preparation: 0.14mol monomer A, 0.45mol monomer B, 0.02mol monomer C, 0.15mol monomer D, initiator, chain transfer agent;

[0026] Preparation steps:

[0027] a. Dissolve monomer C, monomer D and monomer B twice the amount of monomer D in deionized water, stir evenly, and obtain a small monomer solution for use;

[0028] b. Dissolve the chain transfer agent in deionized water, stir evenly, and obtain the chain transfer agent solution for use;

[0029] c. Put the monomer A and deionized water into the reaction container and heat to dissolve. After the monomer A is completely dissolved, add the remaining monomer B and the initiator, and continue to stir and heat up. When the temperature rises to 60±2°C, start The small monomer solution and the chain transfer agent solution were added dropwise at a uniform speed at the same time, and the drop was completed after 3 hours, and then the reaction was continued with heat preservation. During the dropping process and the heat ...

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Abstract

The present invention relates to a poly carboxylic acid water reducing agent adopting tartaric acid as a chain transfer agent, and a preparation method thereof. The technical scheme comprises that: 0.14 mol of methyl alkenyl polyoxyethelene, allyl polyoxyethelene ether or polyoxypropylene ether with a polymerization degree of 30-60, 0.45 mol of methacrylic acid or acrylic acid, 0.02 mol of sodium methylallyl sulfonate, and 0.15 mol of 2-acrylamide-methyl propanesulfonic acid or acrylamide are subjected to a thermal insulation reaction for 4-5 h at a temperature of 58-62 DEG C in a deionized water medium under effects of an initiator agent and tartaric acid adopted as a chain transfer agent to carry out copolymerization to obtain a polymer with a molecular weight of 70000-120000, cooling is performed, and an alkali solution is added to carry out neutralization to obtain the finished product. According to the present invention, the high performance poly carboxylic acid water reducing agent is prepared, problems of high toxicity, easy flammability, easy explosion and the like can be avoided, and environment pollution and hazards on human body can be reduced.

Description

technical field [0001] The invention relates to the technical field of concrete water reducers, in particular to a polycarboxylate water reducer and a preparation method thereof. Background technique [0002] With the continuous advancement of construction technology, large-span, high-rise, and super high-rise buildings emerge in endlessly. Correspondingly, higher requirements are put forward for the most used building material—concrete, which requires concrete to meet various requirements such as high strength, excellent workability, and high durability. performance. For this reason, the fluidity of concrete is still required to meet the requirements of pumping construction under the condition that the water-binder ratio of concrete continues to decrease. This requires that the water reducing agent not only has a higher water reducing effect, but also can effectively control the slump loss of concrete, and better solve the problems of air entrainment, retardation, and blee...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F228/02C08F220/58C08F2/38C04B24/16C04B103/30
Inventor 黄建国董渊李志坤
Owner 天津世纪维鼎科技发展有限公司
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