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Phosphate-based high slump loss resistant type polycarboxylate high-performance water reducing agent and preparation method thereof

A technology of polycarboxylic acid series and water reducing agent, applied in the field of concrete admixtures, can solve the problems of poor performance of water reducing agent, unsatisfactory slump retention ability, and reduced carboxyl group content.

Inactive Publication Date: 2016-08-10
GUANGDONG FUTE NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amount of carboxyl groups contained in the unsaturated phosphate ester prepared in this technology is small and the preparation method is not optimized. The range of pH adjustment is not optimal, and the performance of the obtained water reducer is not good.
[0009] CN 104261719 A discloses a polycarboxylate water reducer, and discloses its general structural formula, which is composed of three parts, unsaturated carboxylic acid monomer, unsaturated phosphoric acid ester monomer and polyether macromonomer , there is no carboxyl group on the two carbon atoms of the disclosed unsaturated phosphate ester monomer, the content of the carboxyl group in the water reducing agent is reduced, and the slump retention ability applied in cement can not achieve the best effect

Method used

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  • Phosphate-based high slump loss resistant type polycarboxylate high-performance water reducing agent and preparation method thereof
  • Phosphate-based high slump loss resistant type polycarboxylate high-performance water reducing agent and preparation method thereof
  • Phosphate-based high slump loss resistant type polycarboxylate high-performance water reducing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Prepare phosphoric acid-based high-slump polycarboxylate-based high-performance water-reducers according to the following raw material quantities and processes, specifically:

[0075](1) Esterification reaction: To ensure that there is no residual water in the reaction kettle, first pass nitrogen into the kettle for 5 minutes, add 15 g of ethylene glycol, and then put 23.7 g of maleic anhydride into the bottom of the kettle, seal the mouth of the kettle, open and stir, and the temperature After keeping at 55°C for 1 hour, turn on the condensed water to lower the temperature, add 9.7 g of deionized water, stir for 5 minutes, and beat the material, turn off the nitrogen and circulating water to obtain ethylene glycol maleate;

[0076] (2) Phosphorylation reaction: Slowly add 42.3 g of the prepared ethylene glycol maleate into the reaction kettle, stir with the stirrer at low speed, and control the temperature of the water bath at 40°C; Add a total of 15g of phosphorus pen...

Embodiment 2

[0084] Prepare phosphoric acid-based high-slump polycarboxylate-based high-performance water-reducers according to the following raw material quantities and processes, specifically:

[0085] (1) Esterification reaction: To ensure that there is no residual water in the reaction kettle, first pass nitrogen into the kettle for 5 minutes, add 13g of ethylene glycol, then put 24.3g of maleic acid into the bottom of the kettle, seal the mouth of the kettle, open and stir, and the temperature After keeping at 50°C for 0.5h, turn on the condensed water to lower the temperature, add 13.3g of deionized water, stir for 5min, then beat the material, turn off the nitrogen, and circulate the water to obtain ethylene glycol maleate;

[0086] (2) Phosphorylation reaction: slowly add 54.1 g of the prepared ethylene glycol maleate into the reaction kettle, stir with a stirrer at a low speed, and control the temperature of the water bath at 45°C. After the reactant is kept at constant temperatur...

Embodiment 3

[0089] Prepare phosphoric acid-based high-slump polycarboxylate-based high-performance water-reducers according to the following raw material quantities and processes, specifically:

[0090] (1) Esterification reaction: To ensure that there is no residual water in the reaction kettle, first pass nitrogen into the kettle for 5 minutes, add 18g of ethylene glycol, and then put 39g of itaconic anhydride into the bottom of the kettle, seal the mouth of the kettle, open and stir, and keep the temperature After keeping at 60°C for 2 hours, turn on the condensed water to lower the temperature, add 10.1 g of deionized water, stir for 5 minutes, then beat the material, turn off the nitrogen, and circulate water to obtain ethylene glycol itaconate.

[0091] (2) Phosphorylation reaction: slowly add 28.8 g of the prepared ethylene glycol itaconate into the reaction kettle, stir with a stirrer at a low speed, and control the temperature of the water bath at 43°C. After the reactants are ke...

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Abstract

The invention relates to a structural formula and a preparation method of a phosphate-based high slump loss resistant type polycarboxylate high-performance water reducing agent. The method includes: performing esterification reaction of alcohol and a mixture of one or more of unsaturated acids and unsaturated acid anhydrides, performing phosphorylation of a phosphatizing agent and prepared unsaturated acid ester, subjecting prepared phosphate and isobutene or TPEG, a chain transfer agent and a mixture of one or more of unsaturated acids and unsaturated acid derivatives to free radical polymerization reaction at the normal temperature, and after reaction is finished, adding an alkali solution to regulate a pH to be 7-9 to obtain the phosphate-based high slump loss resistant type polycarboxylate high-performance water reducing agent. The water reducing agent has the advantages of excellent performances, low admixing quantity, high water reducing rate, excellent slump loss resistance, high cement adaptability, insensitivity to mud content of concrete materials and the like.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures in building materials, in particular to a phosphoric acid-based high-slump polycarboxylate-based high-performance water reducer and a preparation method thereof. Background technique [0002] Concrete is the most widely used building material in modern times. Concrete admixture is the key material for the development of concrete to the high-tech field, and water reducer is the most widely used concrete admixture. Adding water reducing agent into concrete can improve the workability of concrete, increase the strength of concrete, and save cement under the same water consumption. [0003] Polycarboxylate-based water reducer is the third generation of high-performance water reducer developed after ordinary water reducers represented by wood calcium and wood magnesium and high-efficiency water reducers represented by naphthalene and melamine. It has the advantages of low dosage, high wat...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F230/02C08F222/02C08F220/28C08F220/56C08F222/06C04B24/26C07C67/08C07C69/60C07C69/593C07F9/09C04B103/30
CPCC04B24/246C04B2103/302C07C67/08C07F9/091C08F283/065C07C69/60C07C69/593C08F220/281
Inventor 张炜林震梁晓彤黎锦霞
Owner GUANGDONG FUTE NEW MATERIALS TECH CO LTD
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