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Super-retarding polycarboxylic acid type water-reducer as well as preparation method and application thereof

A technology of retarding polycarboxylate and superplasticizer, which is applied in the preparation of superplasticizers, ultra-retarding polycarboxylate superplasticizers, and self-compacting steel pipe concrete, which can solve the problem of concrete compaction in steel pipes Low pressure, low construction efficiency, excessive pump pressure, etc., to avoid abnormal setting time, complete reaction, and improve production efficiency

Inactive Publication Date: 2019-02-05
安徽瑞和新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In the past concrete pouring construction of steel tube arches, due to the lack of ultra-long-term fluidity concrete preparation technology, if the pouring and jacking pumping construction technology is used, it is often impossible to pump continuously at one time, not only the construction efficiency is low, and pump pressure may even occur. Engineering quality accidents such as excessive size, bursting of pump pipes, and low density of concrete in steel pipes

Method used

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  • Super-retarding polycarboxylic acid type water-reducer as well as preparation method and application thereof
  • Super-retarding polycarboxylic acid type water-reducer as well as preparation method and application thereof
  • Super-retarding polycarboxylic acid type water-reducer as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Preparation of graft copolymer: Add 3.2 parts of 2-hydroxyethyltrimethylammonium chloride and 5.7 parts of maleic anhydride in a four-necked flask equipped with stirrer, thermometer, reflux condenser and water separator, heat Dissolve at 90°C-100°C; add 0.11 parts of p-toluenesulfonic acid and raise the temperature to 130°C-140°C, and keep it warm for 4h-6h;

[0039] (2) Preparation of super-retarded polycarboxylate water reducer: 24.0 parts of acrylic acid, 38.6 parts of hydroxyethyl acrylate, 7.7 parts of glycerin, 1.43 parts of ferrous sulfate and 9.60 parts of sodium hypophosphite were added to 250 parts of water , to prepare a mixed solution; add 9.0 parts of the prepared graft copolymer, 399.8 parts of hydroxybutyl vinyl polyoxyethylene ether, 234.1 parts of water and 2.40 parts of hydrogen peroxide in a four-necked bottle equipped with a stirrer and a thermometer ;Heat the four-necked bottle to 40°C~45°C, add the mixed solution dropwise within 3h~4h, and cont...

Embodiment 2

[0041] (1) Preparation of graft copolymer: Add 3.1 parts of 2-hydroxyethyltrimethylammonium chloride and 5.5 parts of maleic anhydride in a four-necked flask equipped with stirrer, thermometer, reflux condenser and water separator, heat Dissolve at 90°C to 100°C; add 0.09 parts of p-toluenesulfonic acid and raise the temperature to 130°C to 140°C, and keep it warm for 4h to 6h;

[0042] (2) Preparation of super-retarded polycarboxylate water reducer: add 27.6 parts of methacrylic acid, 41.7 parts of hydroxypropyl acrylate, 4.8 parts of isopropanol, 1.40 parts of Mohr's salt and 10.32 parts of sodium hypophosphite into 250 8.7 parts of prepared graft copolymer, 385.2 parts of hydroxybutyl vinyl polyoxyethylene ether, 250 parts of water and 2.34 parts of over Hydrogen oxidation; heat the four-necked bottle to 40°C-45°C, add the mixed solution dropwise within 3h-4h, and continue to keep warm for 1h-2h after the dropwise addition is completed; after the reaction is completed, the ...

Embodiment 3

[0044] (1) Preparation of graft copolymer: Add 3.1 parts of 2-hydroxyethyltrimethylammonium chloride and 5.5 parts of maleic anhydride in a four-necked flask equipped with stirrer, thermometer, reflux condenser and water separator, heat Dissolve at 90°C to 100°C; add 0.08 parts of sulfamic acid and raise the temperature to 120°C to 125°C, and keep it warm for 4h to 6h;

[0045] (2) Preparation of ultra-retarded polycarboxylate water reducer: 27.7 parts of methacrylic acid, 37.4 parts of hydroxyethyl acrylate, 7.4 parts of glycerin, 1.24 parts of ferrous sulfate and 10.05 parts of phosphorous acid were added to 250 parts In water, prepare a mixed solution; add 8.7 parts of the prepared graft copolymer, 387.1 parts of hydroxybutyl vinyl polyoxyethylene ether, 250 parts of water and 2.81 parts of tert-butyl base hydrogen peroxide; heat the four-necked bottle to 40°C-45°C, add the mixed solution dropwise within 3h-4h, and continue to keep warm for 1h-2h after the dropwise addition...

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Abstract

The invention relates to a super-retarding polycarboxylic acid type water-reducer as well as a preparation method and application thereof. The preparation method of the super-retarding polycarboxylicacid type water-reducer comprises the following steps of step 1, performing copolymerization on chloridized 2-hydroxyethyl trimethyl ammonium and maleic anhydride under the effect of a catalyst to prepare a grafted copolymer; and step 2, preparing the super-retarding polycarboxylic acid type water-reducer with hydroxybutyl vinyl polyoxyethylene ether, unsaturated carboxylic acid, hydroxyalkyl (methyl)acrylates, polyol and the grafted copolymer at low temperature under the effects of an oxidization-reduction system and a chain transfer agent. By using the prepared super-retarding polycarboxylicacid type water-reducer for steel pipe self-compacting concrete requiring for relatively long setting time, the procedure of compounding a retarder can be saved, the production efficiency is improved, a product can be more uniform and stable, the working performance and the retarding setting time of steel pipe concrete can be improved, the strengths of the steel pipe concrete at various ages areremarkably improved, and the volume stability of the steel pipe concrete can be effectively improved at the same time.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures in building materials, and in particular relates to an ultra-retarding polycarboxylate water reducer, in particular to a preparation method of the water reducer and its application in self-compacting steel tube concrete. Background technique [0002] With the rise of large-scale infrastructure such as bridges, tunnels, and water conservancy in my country, the market demand for polycarboxylate-based water reducers continues to grow. Compared with traditional high-efficiency water reducers, polycarboxylate water reducers have been a research hotspot in concrete water reducers in recent years due to their molecular structure designability. Introducing different functional units into the molecular structure, successfully developed high-water-reducing polycarboxylate-based water-reducers, slump-retaining polycarboxylate-based water-reducers, low-air-entraining polycarboxylate-based water-re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/20C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/065C08F220/06C08F220/20
Inventor 陈国新徐志峰祝烨然杨建峰杜志芹崔征
Owner 安徽瑞和新材料有限公司
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