Low-sensitivity water-reducing slump-retaining polycarboxylic acid water reducer and preparation method thereof

A polycarboxylic acid, low-sensitivity technology, applied in the field of concrete admixtures, can solve the problems of large slump loss, unsatisfactory slump retention effect and adaptability improvement, unable to meet construction requirements, etc., and achieves good mud and weather resistance characteristics, The effect of high water reduction and slump retention performance

Active Publication Date: 2021-09-28
河北红墙新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But at present, with the introduction of phosphoric acid groups, the dispersion performance of polycarboxylate superplasticizer is greatly improved, but the improvement of slump retention effect and adaptability is still not ideal
The reason may be that in the prior art, by introducing phosphoric acid group functional monomers into polycarboxylic acid molecules, the excellent complexation adsorption capacity and stronger electronegativity of the phosphoric acid group are used to effectively improve the dispersion ability of t

Method used

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  • Low-sensitivity water-reducing slump-retaining polycarboxylic acid water reducer and preparation method thereof
  • Low-sensitivity water-reducing slump-retaining polycarboxylic acid water reducer and preparation method thereof
  • Low-sensitivity water-reducing slump-retaining polycarboxylic acid water reducer and preparation method thereof

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Embodiment 1

[0057] An embodiment of the present invention, the preparation method of the low-sensitivity water-reducing and slump-retaining polycarboxylate superplasticizer described in this embodiment, the preparation method includes the following steps:

[0058] (1) Preparation of unsaturated phosphoric acid monomer C

[0059] Add itaconic acid, 1-aminopropyl phosphoric acid, and hydroquinone (polymerization inhibitor) in a molar ratio of 1:1.5:0.003 in sequence in a flask equipped with a stirring device, and react under nitrogen blowing at 115°C for 8 hours. Unsaturated phosphoric acid monomers are obtained.

[0060] (2) Preparation of terminal glucosidation polyether macromonomer B

[0061] Adding polyoxyethylene ether macromonomer (HPEG2400) and glucose at a molar ratio of 1:1.05 in a flask equipped with a stirring device, adding hydroquinone ( Inhibitor), after heating up to 80°C, add p-toluenesulfonic acid (catalyst) equal to 0.2% glucose weight; keep in vacuum state (-0.080~-0.0...

Embodiment 2

[0066] An embodiment of the present invention, the preparation method of the low-sensitivity water-reducing and slump-retaining polycarboxylate superplasticizer described in this embodiment, the preparation method includes the following steps:

[0067] (1) Preparation of unsaturated phosphoric acid monomer C

[0068] Add itaconic acid, 1-amino-2-methylpropyl phosphoric acid, and hydroquinone (polymerization inhibitor) in a molar ratio of 1:1.5:0.003 in sequence in a flask equipped with a stirring device, and blow with nitrogen at 115°C After reacting for 8 hours, an unsaturated phosphoric acid monomer was obtained.

[0069] (2) Preparation of terminal glucosidation polyether macromonomer B

[0070] Adding polyoxyethylene ether macromonomer (TPEG2400) and glucose with a molar ratio of 1:1.05 in a flask equipped with a stirring device, adding hydroquinone ( Inhibitor), after heating up to 80°C, add p-toluenesulfonic acid (catalyst) equal to 0.2% glucose weight; keep in vacuum ...

Embodiment 3

[0075] An embodiment of the present invention, the preparation method of the low-sensitivity water-reducing and slump-retaining polycarboxylate superplasticizer described in this embodiment, the preparation method includes the following steps:

[0076] (1) Preparation of unsaturated phosphoric acid monomer C

[0077] Add itaconic acid, 1-amino-2-methylpropyl phosphoric acid, and hydroquinone (polymerization inhibitor) in a molar ratio of 1:1.5:0.003 in sequence in a flask equipped with a stirring device, and blow with nitrogen at 115°C After reacting for 8 hours, an unsaturated phosphoric acid monomer was obtained.

[0078] (2) Preparation of terminal glucosidation polyether macromonomer B

[0079] Add polyoxyethylene ether macromonomer (TPEG2400) and glucose at a molar ratio of 1:1.05 into a flask equipped with a stirring device, and add polyoxyethylene ether macromonomer (TPEG2400) equal to 0.002%

[0080] Weight of hydroquinone (polymerization inhibitor), after heating up...

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Abstract

The invention discloses a low-sensitivity water-reducing slump-retaining polycarboxylic acid water reducer and a preparation method thereof, and relates to the technical field of concrete admixtures. The invention provides a structural formula and a preparation method of a low-sensitivity type water-reducing and slump-retaining polycarboxylic acid water reducer, and also provides application of the low-sensitivity type water-reducing and slump-retaining polycarboxylic acid water reducer in preparation of concrete. The water reducer provided by the invention has high water reducing and slump retaining properties, also has good mud-resistant and weather-resistant characteristics, and meets the workability of concrete under the conditions of raw material fluctuation, high temperature, long-distance transportation and the like.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a low-sensitivity water-reducing and slump-retaining polycarboxylate water-reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer is the third generation of high-performance superplasticizer. Compared with the previous two generations of superplasticizers, it has the advantages of low dosage, strong molecular designability, and environmental protection. It is widely used in roads, railways, bridges, etc. It is currently the most widely used concrete admixture in the fields of , dams and high-rise buildings. [0003] However, the natural resource consumption of concrete raw materials is huge, and high-quality sand and stone resources are almost exhausted. It has become a development trend to apply low-quality aggregates such as construction solid waste, machine-made sand, and natural sand with high mud content to concre...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F230/02C08F220/06C08G65/331C04B24/26C04B103/30
CPCC08F283/065C08G65/3312C04B24/246C04B2103/302C08F230/02C08F220/06
Inventor 王子儒白淑英张小富刘虎李宁
Owner 河北红墙新材料有限公司
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