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Dynamic polycarboxylic acid cement dispersing agent, preparation method and application thereof

A technology of cement dispersant and polycarboxylic acid, which is applied in the field of concrete admixture, can solve the problems of inaccurate control of the initial fluidity and later fluidity of concrete, insufficient number of superplasticizer molecules, and increase of concrete cost, so as to reduce the cost of concrete Cost, slump loss increase mitigation, and the effect of improving water reducing capacity

Active Publication Date: 2013-03-20
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Conventional polycarboxylate dispersant can provide good dispersing ability due to its strong adsorption ability, but at the same time, it will inevitably cause insufficient number of remaining superplasticizer molecules in the concrete system, resulting in insufficient slump retention ability
At present, the most effective way to alleviate the fluidity loss of high-performance concrete mixed with polycarboxylate dispersants is to over-dope admixtures or add additional slump-retaining components. The cost of concrete is increased, and at the same time, the initial fluidity and later fluidity of concrete cannot be accurately controlled, thus increasing the difficulty of operation

Method used

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  • Dynamic polycarboxylic acid cement dispersing agent, preparation method and application thereof
  • Dynamic polycarboxylic acid cement dispersing agent, preparation method and application thereof
  • Dynamic polycarboxylic acid cement dispersing agent, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] In the glass reactor equipped with thermometer, stirrer, dropping funnel and nitrogen inlet pipe, add 350g deionized water, add 560gA-1 (0.08mol) simultaneously, purging reaction vessel with nitrogen while stirring, and be warming up to Dissolve at 30°C, then add 5g of hydrogen peroxide (effective concentration: 30%), and stir evenly. Then mix 182.4g B-1 (0.8mol), 1.8g mercaptoacetic acid, 2.07g 3-mercaptopropionic acid, and 70g water, stir to form a uniform monomer aqueous solution, and drop it into the reactor for 2 hours. , and dropwise add 55g of the aqueous solution containing 7g L-ascorbic acid at the same time, the time of dropping is about 2h, after the dropwise addition is completed, the insulation reaction is 2h, then add 10g of the aqueous solution containing 0.7g L-ascorbic acid in the reaction bottle, and continue to insulate for 1h, Cool to room temperature, add alkali to neutralize to pH 7.0, and obtain an orange-yellow transparent liquid with a solid con...

Embodiment 2

[0045] In a glass reactor equipped with a thermometer, a stirrer, a dropping funnel, and a nitrogen inlet tube, add 250 g of deionized water and 500 g of A-2 (0.5 mol) at the same time, purging the reaction vessel with nitrogen while stirring, and raising the temperature Dissolve at 50°C, then add 2 g of hydrogen peroxide (effective concentration: 30%), and stir evenly. Then 225g of B-2 (1.25mol), 3.7g of 3-mercaptopropionic acid, and 100g of water were mixed together, stirred to form a uniform monomer aqueous solution, which was added dropwise to the reactor for 6 hours, and 100g of The aqueous solution containing 0.6g sodium formaldehyde sulfoxylate, the time of dropping is about 6h, after the dropwise addition is completed, keep warm for 2h, then add 30g aqueous solution containing 0.07g sodium formaldehyde sulfoxylate to the reaction bottle, and continue to keep warm for 1h, cool Bring to room temperature, add alkali to neutralize to a pH value of 7.7, and obtain an orange...

Embodiment 3

[0047] In a glass reactor equipped with a thermometer, a stirrer, a dropping funnel and a nitrogen inlet tube, add 730g of deionized water, and simultaneously add 300g of A-2 (0.3mol) and 480g of A-3 (0.2mol), while stirring The reaction vessel was purged with nitrogen, and the temperature was raised to 60° C. to dissolve, then 1.2 g of hydrogen peroxide (effective concentration: 30%) was added, and stirred evenly. Then 270g of B-3 (1.5mol), 4.6g of mercaptoacetic acid, and 200g of water were mixed, stirred to form a uniform monomer aqueous solution, which was added dropwise to the reactor for 5 hours, and 100g of 0.9 The aqueous solution of g L-ascorbic acid, the dropping time is about 5h, after the dropwise addition, keep warm for 2h, then add 20g aqueous solution containing 0.1g L-ascorbic acid to the reaction bottle, keep warm for 1h, cool to room temperature, add alkali And until the pH value is 6.8, an orange-yellow transparent liquid with a solid content of 48.6% and a ...

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Abstract

The invention discloses dynamic polycarboxylic acid cement dispersing agent, a preparation method and an application thereof. The preparation method for the dynamic polycarboxylic acid cement dispersing agent comprises polymerizing a monomer A and a monomer B in a molar ratio of 1 to (2-10) to form dynamic polycarboxylic acid cement dispersing agent, wherein the molecular weight of the dynamic polycarboxylic acid cement dispersing agent is 20000 to 80000. The cement dispersing agent provided by the invention effectively reduces the dosage of the dispersing agent in the concrete and remarkably reduces the cost of the concrete. At an initial phase, the cement dispersing agent provided by the invention adopts a sulfonic radical as an adsorption radical, so that the influence of sulfate ion in the concrete solution to the cement dispersing agent is effectively reduced for achieving a better material adaptability; meanwhile, the dynamic polycarboxylic acid cement dispersing agent has good slump holding capacity, effectively avoids a defect that the slump holding capacity of the normal carboxylic acid dispersing agent is insufficient under low accretion, and simultaneously avoids a problem that the dispersing effect is weakened and construction difficulty is increased as special slump holding agent is additionally added to improve the slump holding capacity of the concrete.

Description

technical field [0001] The invention relates to a dynamic polycarboxylate cement dispersant, its preparation method and application, and belongs to the technical field of concrete admixtures. Background technique [0002] After years of development, polycarboxylate-based dispersants have become an indispensable key to the preparation of high-performance concrete, relying on their advantages such as low dosage, high water-reducing rate, stronger slump-retaining ability than naphthalene-based water-reducing agents, and no pollution in the preparation process. Components have also become a research hotspot at home and abroad. Comb-shaped polycarboxylic acid dispersants are basically composed of a main chain composed of carboxyl groups, hydroxyl groups, sulfonic acid groups and other groups and side chains composed of polyalkylene glycol ether macromolecules. The polar anionic groups on the main chain produce electrostatic adsorption on the positively charged cement particles, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/38C08F216/18C08F216/20C08F216/14C08F4/40C04B24/16C04B103/40
Inventor 冉千平周栋梁刘加平杨勇刘金芝
Owner JIANGSU SOBUTE NEW MATERIALS
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