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Shrinkage reduction and thickening type alkali-free liquid accelerator as well as preparation method and application thereof

A technology of accelerator and liquid, which is applied in the field of liquid alkali-free accelerator and its preparation, can solve the problems of reducing sprayed concrete and the health threats of construction workers, and achieve the reduction of production cost, reduction of construction rebound loss, and adaptability Good results

Active Publication Date: 2020-02-04
CHINA STATE CONSTR READY MIXED CONCRETE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the liquid alkali-free quick-setting agent with shrinkage and anti-cracking functions provided by the invention can reduce the 28d drying shrinkage of shotcrete to a certain extent, it does not mention about reducing the rebound loss of concrete during construction and reducing the dust concentration. There are still threats to the health of construction workers

Method used

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  • Shrinkage reduction and thickening type alkali-free liquid accelerator as well as preparation method and application thereof
  • Shrinkage reduction and thickening type alkali-free liquid accelerator as well as preparation method and application thereof
  • Shrinkage reduction and thickening type alkali-free liquid accelerator as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A kind of preparation of reducing thickening composition, comprises the following steps:

[0041] (1) Esterification reaction

[0042] Mix 3 mol of acrylic acid, 1 mol of polyethylene glycol ether, 0.012 mol of hydroquinone and 0.04 mol of p-toluenesulfonic acid, stir and heat up to 95°C, after 3 hours of esterification, distill under reduced pressure to obtain polyethylene glycol ether acrylate;

[0043] (2) Polymerization reaction

[0044] Access to N 2 Rinse the four-necked flask, then add 300g of deionized water, 12mol of acrylamide and 10mol of methacrylamide, stir to dissolve, gradually raise the temperature to 75°C, and after stirring at constant temperature for 8min, add 1mol of ethyl methacrylate and 0.5mol of The polyethylene glycol ether acrylate and 0.09mol ammonium persulfate aqueous solution obtained in step (1) are added dropwise for 2 hours. After the dropwise addition is completed, react at a constant temperature for 3 hours, and then cool the reactan...

Embodiment 2

[0048]A kind of preparation of reducing thickening composition, comprises the following steps:

[0049] (1) Esterification reaction

[0050] Mix 3 mol of acrylic acid, 1 mol of polyethylene glycol ether, 0.012 mol of hydroquinone and 0.04 mol of p-toluenesulfonic acid, stir and heat up to 95°C, after 3 hours of esterification, distill under reduced pressure to obtain polyethylene glycol ether acrylate;

[0051] (2) Polymerization reaction

[0052] Access to N 2 Rinse the four-necked flask, then add 300g of deionized water, 12mol of acrylamide and 10mol of methacrylamide, stir to dissolve, slowly raise the temperature to 75°C, stir at constant temperature for 8min, slowly add 1mol of ethyl methacrylate, 1mol of 1) The obtained polyethylene glycol ether acrylate and 0.12mol ammonium persulfate aqueous solution are added dropwise for 2 hours. After the dropwise addition is completed, react at a constant temperature for 3 hours, and then cool the reactant to terminate the reacti...

Embodiment 3

[0056] A kind of preparation of reducing thickening composition, comprises the following steps:

[0057] (1) Esterification reaction

[0058] Mix 3 mol of acrylic acid, 1 mol of polyethylene glycol ether, 0.012 mol of hydroquinone and 0.04 mol of p-toluenesulfonic acid, stir and heat up to 95°C, after 3 hours of esterification, distill under reduced pressure to obtain polyethylene glycol ether acrylate;

[0059] (2) Polymerization reaction

[0060] Access to N 2 Rinse the four-neck flask, then add 300g of deionized water, 17mol of acrylamide and 10mol of methacrylamide, stir to dissolve, slowly raise the temperature to 75°C, stir at constant temperature for 8min, slowly add 1mol of ethyl methacrylate, 0.5mol of step (1) The obtained polyethylene glycol ether acrylate and 0.09mol ammonium persulfate aqueous solution are added dropwise for 2 hours. After the dropwise addition is completed, the reaction is carried out at a constant temperature for 3 hours, and then the reactant...

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Abstract

The invention discloses a shrinkage reduction and thickening type alkali-free liquid accelerator as well as a preparation method and application thereof. The accelerator consists of aluminum sulfate,organic amine, a stabilizing agent, an inorganic acid, a shrinkage reduction and thickening component and deionized water, wherein the shrinkage reduction and thickening component simultaneously comprises groups with functions of shrinkage reduction and thickening; and the preparation method of the shrinkage reduction and thickening component comprises the following steps: under the actions of a catalyst and an inhibitor, performing an esterification reaction on acrylic acid and polyethylene glycol ether so as to generate an intermediate polyethylene glycol ether acrylate, and performing a free radical polymerization reaction on the polyethylene glycol ether acrylate with methyl acrylate, acrylamide and methyl acrylamide under the action of an initiator, and performing alkaline neutralization, so as to obtain the shrinkage reduction and thickening component. The shrinkage reduction and thickening type alkali-free liquid accelerator simultaneously has functions of shrinkage reduction and thickening, is capable of not only reducing shrinkage of jet concrete and improving the structural durability of the jet concrete, but also remarkably improving the viscous coagulation performance of the jet concrete, reducing construction rebound loss and reducing dust concentrations, and is suitable for promotion and application.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a liquid alkali-free quick-setting agent with functions of reducing shrinkage, anti-cracking and thickening, and its preparation method and application. Background technique [0002] As we all know, concrete is the most important and widely used bulk civil engineering material in modern engineering construction, but due to the brittleness of concrete, once it shrinks too much, it will seriously affect the quality of concrete engineering. Shrinkage causes cracks inside the concrete. On the one hand, it reduces its strength and accelerates the deterioration of the concrete. On the other hand, it increases the possibility of other harmful substances entering the concrete, making the concrete more prone to corrosion of steel bars and alkali-aggregate reactions. problem, thereby reducing its durability. The above problems are more prominent in shotcrete. Generally speakin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C08F283/06C08F220/56
CPCC04B40/0039C08F283/065C04B2103/12C04B22/148C04B24/122C04B24/2652C04B22/165C04B24/123C08F220/56
Inventor 周博儒赵日煦王军张恒春熊龙李兴邢菊香余昆
Owner CHINA STATE CONSTR READY MIXED CONCRETE CO LTD