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Early strength type polycarboxylate water reducer and preparation method thereof

A technology of polycarboxylic acid and water reducing agent, applied in the field of building materials, can solve the problems of insufficient early strength of concrete, and achieve the effect of accelerating the cement hydration acceleration period, adding less amount, and improving the early strength.

Active Publication Date: 2019-02-19
UNIV OF JINAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at a series of problems such as insufficient early strength of concrete caused by existing polycarboxylate superplasticizers, the present invention provides an early-strength polycarboxylate superplasticizer, which uses unsaturated esters containing alcoholamine groups And the unsaturated amide group-containing compound is an unsaturated early-strength monomer. The modification of the water-reducing agent by the unsaturated early-strength monomer can effectively promote the hydrolysis of cement minerals, effectively improve the early strength of cement and concrete structures, and shorten the Set time, improve production efficiency

Method used

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  • Early strength type polycarboxylate water reducer and preparation method thereof
  • Early strength type polycarboxylate water reducer and preparation method thereof
  • Early strength type polycarboxylate water reducer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041]In the reaction equipment equipped with stirring, temperature control and condensing reflux devices, put 16.3g of DEIPA (diethanol monoisopropanolamine) in a four-necked flask, add 7.4g of propionic acid for neutralization, and control the temperature below 55 ℃, then add 9.8g of maleic anhydride, 0.47g of catalyst p-toluenesulfonic acid and 0.0094g of polymerization inhibitor hydroquinone, control the reaction temperature at about 105°C, and stop the reaction until the acid value no longer decreases. Pressure distillation removes propionic acid, promptly obtains the unsaturated ester A containing alcoholamine group, and its structural formula is as follows:

[0042]

Embodiment 2

[0044] In the reaction equipment equipped with stirring, temperature control and condensing reflux devices, put 17.7g of EDIPA (monoethanol diisopropanolamine) in a four-necked bottle, add 7.4g of propionic acid for neutralization, and control the temperature below 58 ℃, then add 9.8g of maleic anhydride, 0.50g of catalyst p-toluenesulfonic acid and 0.01g of inhibitor hydroquinone, control the reaction temperature at about 110℃, and stop the reaction until the acid value no longer decreases. Pressure distillation removes propionic acid, promptly obtains the unsaturated ester B containing alcoholamine group, and its structural formula is as follows:

[0045]

Embodiment 3

[0047] In the reaction equipment equipped with stirring, temperature control and condensing reflux devices, 16.3g of DEIPA (diethanol monoisopropanolamine) was placed in a four-necked flask, 7.4g of propionic acid was added for neutralization, and the temperature was controlled at 60 ℃, then add 13.1g itaconic anhydride, 0.52g catalyst phosphorus pentoxide and 0.01g polymerization inhibitor p-hydroxyanisole, control the reaction temperature at about 105 ℃, and stop the reaction until the acid value is no longer reduced. Pressure distillation removes propionic acid, promptly obtains the unsaturated ester C containing alcoholamine group, and its structural formula is as follows:

[0048]

[0049] Preparation of early-strength polycarboxylate superplasticizer

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Abstract

The invention discloses an early strength type polycarboxylate water reducer and a preparation method thereof. The early strength type polycarboxylate water reducer is prepared by performing free radical polymerization on unsaturated polyether, unsaturated carboxylic acid, hydramine-containing unsaturated ester and amide-containing unsaturated compounds in a redox system under the action of chaintransfer agent; the preparation process saves heat sources and accordingly is green and environmentally friendly. According to the prepared early strength type polycarboxylate water reducer, the long-chain unsaturated polyether can achieve certain enhancing effects on the early strength of cement and concrete components; the hydramine-containing unsaturated ester and the amide-containing unsaturated compounds serve as unsaturated early strength monomers, contained hydramine groups and amide groups can promote hydration of C3A (3CaO*Al2O3) to produce ettringite, thereby accelerating cement hydration, shortening the time of cement setting, improving the early strength and increasing the production efficiency of the cement and concrete components. Meanwhile, the carboxylic acid groups and theester groups inside the molecules of the early strength type polycarboxylate water reducer endow the early strength type polycarboxylate water reducer with good dispersibility and dispersion retentivity.

Description

technical field [0001] The invention relates to an early-strength polycarboxylate water-reducer and a preparation method thereof, in particular to an unsaturated ester containing an alcohol amine group and an unsaturated compound containing an amide group as an unsaturated early-strength monomer An early-strength polycarboxylate water reducer and a preparation method thereof belong to the technical field of building materials. Background technique [0002] In the field of construction engineering, concrete is the most widely used civil engineering material. Concrete is required for building houses, repairing dikes and dams, and building railways. With the development of the times, higher requirements are placed on the performance of concrete, and higher requirements are placed on the functionality of polycarboxylate superplasticizers. Polycarboxylate superplasticizer has the characteristics of low dosage, high water reducing rate, good workability and durability of concrete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/02C08F222/22C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/065C08F222/103
Inventor 叶正茂卢晓磊雷田雨杜保立付兴华
Owner UNIV OF JINAN
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