Water-reduction and plasticity-maintaining polycarboxylate-type water reducing agent and preparing method thereof

A polycarboxylic acid-based, water-reducing agent technology, applied in the field of cement dispersants, can solve the problems of plastic retention and concrete state and poor cohesion, divergence, easy segregation and bleeding, etc., and achieves excellent working performance, simplified technological process, Widely adaptable effect

Active Publication Date: 2016-07-20
JINAN SHIJIE HUAXIN IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a water-reducing, plastic-retaining polycarboxylate water-reducing agent and its preparation method, through the application of unsaturated polyoxyethylene glycol ether macromonomer, unsaturated acid monomer and sulfur-containing A new type of polycarboxylate water reducer is copolymerized with modified monomers, aiming to solve the problems of plastic retention, concrete state and poor cohesion, divergence, and easy segregation and bleeding of conventional products when mixing concrete.

Method used

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  • Water-reduction and plasticity-maintaining polycarboxylate-type water reducing agent and preparing method thereof
  • Water-reduction and plasticity-maintaining polycarboxylate-type water reducing agent and preparing method thereof
  • Water-reduction and plasticity-maintaining polycarboxylate-type water reducing agent and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0038] Add 200g of PEG400 (0.5mol), SA53g (0.5mol), 0.6g of polymerization inhibitor hydroquinone, 6.0g of catalyst concentrated sulfuric acid and 27g of water-containing silica gel to a four-necked glass flask with thermometer, condenser and stirring device. , The temperature is slowly raised to 80°C. After the temperature rose to 80°C for 3.0 hours of reaction, 49g (0.5mol) of maleic anhydride was added to the reaction kettle, and the reaction was continued for 3.0 hours at this temperature. After the reaction is completed, the silica gel is filtered out to obtain about 270 g of sulfur group-containing modified monomer SA-PEG400-MAL.

Synthetic example 2

[0040] Add 300g of PEG600 (0.5mol), SA53g (0.5mol), 0.8g of polymerization inhibitor hydroquinone, 8.0g of catalyst concentrated sulfuric acid and 36g of water-containing silica gel to a four-necked glass flask equipped with a thermometer, condenser and stirring device. , The temperature is slowly raised to 90°C. After the temperature rose to 90°C for 4.0 hours, 49g (0.5mol) maleic anhydride was added to the reaction kettle, and the reaction was continued at this temperature for 2.0 hours. After the reaction is completed, the silica gel is filtered out to obtain about 370 g of sulfur-containing modified monomer SA-PEG600-MAL.

Embodiment 1

[0042] 100g of deionized water was added to a four-necked glass flask equipped with a thermometer, a condenser and a stirring device, the stirring was turned on, and 107g of HPEG23 (0.1 mol) was added to it, and the temperature was started. When the temperature rises to 60°C, add 0.25g FAS to the flask and stir for 15 minutes, and then start to feed A and B with a metering pump. Material A is 21.6gAA (0.3mol), 5.68g SA-PEG400-MAL (0.01mol) and 6.82g deionized water to form an 80% aqueous solution; material B is 0.52g initiator (NH 4 ) 2 S 2 O 8 Add 9.88g of deionized water to the solution to make a 5% mass fraction of aqueous solution. Material A was dropped in 2.5 hours, and material B was added in 3.0 hours. After the addition of material A, keep it at this temperature for 1.0h, reduce to about 40℃, neutralize with 30% NaOH to pH=6-8, and add quantitative water to obtain a mass fraction of 40% polycarboxylic acid reduction Liquid product 1.

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Abstract

The invention provides a water-reduction and plasticity-maintaining polycarboxylate-type water reducing agent and a preparing method thereof, and belongs to the technical field of cement dispersing agents.According to the technical scheme, the water reducing agent is essentially formed by copolymerizing unsaturation polyoxyethylene glycol-ether macromonomers, unsaturated acid monomers and sulfenyl-containing modified monomers, wherein the sulfenyl-containing modified monomers are ester of thiohydracrylic acid, polyethylene glycol and maleic anhydride.According to the water reducing agent and the preparing method, as the sulfenyl-containing modified monomers are applied, the product has the large water reducing rate, and meanwhile high plasticity maintaining performance and excellent concrete working performance are kept; in addition, the wide adaptability with different kinds of cement and aggregates are shown.

Description

Technical field [0001] The invention relates to a cement dispersant, in particular to a water-reducing and plastic-preserving polycarboxylic acid water-reducing agent and a preparation method thereof. Background technique [0002] Concrete admixture has experienced the first generation of lignin general water reducer and the second generation of naphthalene series superplasticizer, and now it has developed to the third generation of polycarboxylic acid series high performance water reducer. Due to its many advantages such as low dosage, high water reduction rate, simple production process, and environmental protection, polycarboxylic acid water-reducing agents have become mainstream products in the water-reducing agent market, and more and more are used in high-speed railways, Highways, nuclear power, dams, water conservancy and hydropower, and industrial and civil construction projects. [0003] However, with the increase in the application of polycarboxylic acid-based water redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/16C08F222/02C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/065C08F222/1063
Inventor 张栓红张学强
Owner JINAN SHIJIE HUAXIN IND CO LTD
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