Viscosity-reduction type polycarboxylate water reducer and preparation method thereof

A technology of polycarboxylate and water reducer, which is applied in the field of cement dispersant, polycarboxylate water reducer and its preparation, which can solve the problems of high synthesis cost, poor adaptability of cement and aggregate, unsatisfactory viscosity reduction effect, etc. Problems, to achieve low viscosity, no heating, improve the effect of hydrophilic and lipophilic

Active Publication Date: 2018-06-22
JINAN SHIJIE HUAXIN IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of water reducing agent can effectively reduce the slurry viscosity of low water-binder ratio high-strength concrete, and it has the effect of maintaining the slump and fluidity of concrete for a long time without compounding with high-slump polycarboxylate water-reducing agent However, there are still problems such as high synthesis cost, poor adaptability to cement and aggregate, and relatively unsatisfactory viscosity reduction effect.

Method used

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  • Viscosity-reduction type polycarboxylate water reducer and preparation method thereof
  • Viscosity-reduction type polycarboxylate water reducer and preparation method thereof
  • Viscosity-reduction type polycarboxylate water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: To simplify the expression, HPEG23, 50 and TPEG23, 50 respectively represent methallyl polyoxyethylene glycol and isopentenyl polyoxyethylene glycol with oxyethylene units of 23 and 50; MAA represents Methacrylic acid; MAL means maleic anhydride; SC means salicylic acid; SA means mercaptopropionic acid; ester group-containing modified monomer MA-SC means the esterification of salicylic acid and maleic anhydride; (NH 4 ) 2 S 2 o 8 stands for ammonium persulfate; FAS stands for ferrous ammonium sulfate.

Synthetic example 1

[0039] Add 23g absolute ethanol (0.5mol), SC69g (0.5mol), 49g (0.5mol) maleic anhydride, catalyst p-toluenesulfonic acid 3.0g in the four-neck glass flask with thermometer, condenser and stirring device , the temperature was slowly raised to 40°C, and the reaction was continued for 3.0h at this temperature. After the reaction, 140 g of ester group-containing modified monomer MA-SC was obtained.

[0040] Example 1

[0041] 100g of deionized water was added to a four-necked glass flask with a thermometer, a condenser tube and a stirring device, and the stirring was started, 107g of HPEG23 (0.1mol) was added thereto, and the stirring was continued. After adding 0.25g of FAS and stirring for 15min in the flask, Start to add material A and material B with a metering pump. A material is 25.8g MAA (0.3mol), 2.36g MA-SC (0.01mol), 0.86gSA and 7.26g deionized water are made into the aqueous solution of mass fraction 80%; B material is 0.52g initiator (NH 4 ) 2 S 2 o 8 Add 9.88g o...

Embodiment 2

[0043] Add 100g of deionized water into a four-necked glass flask with a thermometer, condenser and stirring device, turn on the stirring, add 108.8g of TPEG23 (0.1mol) to it, and keep stirring, add 0.42g of FAS to the flask and stir for 15min , Start adding material A and material B with a metering pump. A material is 21.5g MAA (0.25mol), 4.72g MA-SC (0.02mol), 1.0gSA and 6.81g deionized water are made into the aqueous solution of mass fraction 80%; B material is 0.85g initiator (NH 4 ) 2 S 2 o 8 Add 16.15 g of deionized water to the solution to form an aqueous solution with a mass fraction of 1.5%. Add material A in 3.0 hours, and add material B in 3.5 hours. After adding material A, keep it at this temperature for 1.0h, neutralize it with 30% NaOH to pH=6-7, and add a certain amount of water to obtain product 2 with a mass fraction of 40% polycarboxylate water reducer.

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Abstract

The invention provides a viscosity-reduction type polycarboxylate water reducer and a preparation method thereof, and relates to the technical field of concrete admixtures. Through the technical scheme, the water reducer is essentially formed by copolymerizing unsaturated polyoxyethylene glycol ether macromonomers, unsaturated acid monomers and modified monomers containing ester groups under the effect of a redox system and a chain transfer agent, wherein the modified monomers containing ester groups comprise esters of salicylic acid and maleic anhydride. The viscosity-reduction type polycarboxylate water reducer synthesized in the invention is simple in technology, low in cost and easy to operate, and has good dispersibility and dispersion retainability, so that the requirement of long-distance transportation is met; when the water reducer is applied to high-performance concrete, the viscosity reduction effect is obvious, the viscosity of high grade concrete can be reduced effectively, the slump retainability of concrete is improved, the rheological property and working performance of concrete are improved, and the water reducer is particularly applicable for preparing high-strength, superhigh-strength and self-compact concrete. Moreover, the water reducer has broad adaptability for different cements and aggregates.

Description

technical field [0001] The invention relates to a cement dispersant, in particular to a viscosity-reducing polycarboxylate water reducer and a preparation method thereof. The invention belongs to the technical field of concrete admixtures. Background technique [0002] As one of the four major building structural materials, concrete is being used more and more. In recent years, with the expansion of my country's infrastructure, high-grade concrete is gradually entering the construction market due to its high strength, good integrity, and low weight, especially in bridge engineering. In order to make concrete reach high-strength or ultra-high-strength grades, a large amount of cementitious materials and a low water-binder ratio must be used, which leads to the problems of high-grade concrete with high viscosity and slow flow speed, making construction difficult, especially for ultra-high-strength concrete. The problem of high viscosity is particularly serious in pumping cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F216/18C08F220/06C08F222/20C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F216/18C08F220/06C08F222/20
Inventor 张栓红张学强
Owner JINAN SHIJIE HUAXIN IND CO LTD
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