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Synthetic technology of slump-retaining polycarboxylic type water reducer

A technology of polycarboxylic acid series and synthesis process, which is applied in the field of synthesis process of slump-retaining polycarboxylate-based water reducer, which can solve the problems of prolonged concrete setting time, weak slump-preservation ability, and influence on construction progress, etc., and achieves excellent performance. Good workability, good slump stability, and optimized molecular structure

Active Publication Date: 2015-12-30
HEBEI SANKAISHENFA SCI & TECH CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of retarder fundamentally does not solve its weak slump-preserving ability. If the amount is too large, it will prolong the setting time of concrete and affect the construction progress of the project.

Method used

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  • Synthetic technology of slump-retaining polycarboxylic type water reducer
  • Synthetic technology of slump-retaining polycarboxylic type water reducer
  • Synthetic technology of slump-retaining polycarboxylic type water reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]Add 250 g of deionized water into a 2000 mL four-neck flask, preheat to 30°C, add 430 g of prenol polyoxyethylene ether macromonomer with a molecular weight of 3900 and stir to dissolve. After the macromonomer is dissolved, add 4.77 g of hydrogen peroxide and stir evenly, and add A separately at 30°C with a peristaltic pump. 1 Solution (an aqueous solution consisting of 17.2 grams of acrylic acid, 21.5 grams of β-carboxyethyl acrylate and 25.8 grams of deionized water) was added dropwise for 2.5 hours, and solution B (8.6 grams of 3-allyloxy-2-hydroxypropanesulfonic acid Sodium and the aqueous solution that 77.4 grams deionized water forms) drop time 2.5h and C 1 Solution (an aqueous solution consisting of 1.19 grams of vitamin C, 2.39 grams of 3-mercaptopropionic acid, and 139.62 grams of deionized water) was added dropwise for 2.5 hours.

[0030] A 1 Liquid, B liquid and C 1 After the liquid drops, add 4.26 grams of hydrogen peroxide and stir evenly, and immediately...

Embodiment 2

[0033] Add 250 g of deionized water into a 2000 mL four-neck flask, preheat to 30°C, add 430 g of prenol polyoxyethylene ether macromonomer with a molecular weight of 3900 and stir to dissolve. After the macromonomer is dissolved, add 7.29 g of hydrogen peroxide and stir evenly, and add A separately at 30°C with a peristaltic pump. 1 Solution (an aqueous solution consisting of 21.5 grams of acrylic acid, 23.65 grams of β-carboxyethyl acrylate and 30.1 grams of deionized water) was added dropwise for 2.5 hours, solution B (10.75 grams of 3-allyloxy-2-hydroxypropanesulfonic acid Sodium and 96.75 grams of deionized water aqueous solution) drop time 2.5h and C 1 Solution (an aqueous solution consisting of 1.21 grams of vitamin C, 2.43 grams of 3-mercaptopropionic acid and 141.96 grams of deionized water) was added dropwise for 2.5 hours.

[0034] A 1 Liquid, B liquid and C 1 After the liquid drops, add 4.26 grams of hydrogen peroxide and stir evenly, and immediately dropwise ad...

Embodiment 3

[0037] Add 250 g of deionized water into a 2000 mL four-neck flask, preheat to 30°C, add 430 g of prenol polyoxyethylene ether macromonomer with a molecular weight of 3900 and stir to dissolve. After the macromonomer is dissolved, add 6.07 g of hydrogen peroxide and stir evenly, and add A separately at 30°C with a peristaltic pump. 1 Solution (an aqueous solution consisting of 25.8 grams of acrylic acid, 17.2 grams of β-carboxyethyl acrylate and 28.7 grams of deionized water) was added dropwise for 2.5 hours, and solution B (12.9 grams of 3-allyloxy-2-hydroxypropanesulfonic acid Sodium and the aqueous solution that 116.1 gram deionized waters form) drop time 2.5h and C 1 Solution (an aqueous solution composed of 1.22 grams of vitamin C, 2.43 grams of 3-mercaptopropionic acid and 142.35 grams of deionized water) was added dropwise for 2.5 hours.

[0038] A 1 Liquid, B liquid and C 1 After the liquid drops, add 4.35 grams of hydrogen peroxide and stir evenly, and immediately ...

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Abstract

The invention discloses a synthetic technology of a slump-retaining polycarboxylic type water reducer. Specifically, beta-carboxyethyl acrylic ester with the high water-reducing function and slump-retaining function and 3-allyloxy-2-hydroxy sodium propanesulfonic acid with the high water-reducing function are introduced in the synthetic process, and diethylene glycol monoacrylate and other monomers with special functions are introduced into the slump-retaining component. According to the synthetic technology, an oxidation-reduction initiating system molecular weight regulator is adopted in the water phase, and therefore the monomers with the slump-retaining function and the water-reducing function are synthesized in a one-pot subsection relay dropwise addition synthetic mode. Concrete tests prove that the synthetic product has the water reducing performance and slump retaining performance, the workability of fresh concrete is greatly improved, and the sensitivity of the water reducer for the water amount is lowered.

Description

technical field [0001] The invention relates to the technical field of concrete admixture synthesis, and more specifically relates to a synthesis process of a slump-preserving polycarboxylate water reducer. Background technique [0002] As we all know, the polycarboxylate high-performance water reducer has the advantages of low dosage, good dispersibility, high water reducing rate, strong slump retention, low shrinkage rate, no "three wastes" in the production process, and environmental protection. widely concerned by people. In recent years, polycarboxylate high-performance water reducers have been widely used in major national key projects and played an important role. At present, it is developing rapidly, the market demand has increased dramatically, and there is a lot of room for development. Polycarboxylate-based high-performance water reducers have become an inevitable trend of research and development in the 21st century. However, due to my country's vast territory,...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F216/14C08F222/16C08F220/28C08F4/40C08F2/38C04B24/16C04B103/30
Inventor 马国栋谢红靳通收王文彬骆志超陈占虎李茜茜李红双
Owner HEBEI SANKAISHENFA SCI & TECH CORP LTD
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