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Preparation method of amido polycarboxylic water-reducing agent

An amide type polycarboxylic acid and water reducing agent technology, applied in the field of concrete admixtures, can solve the problems of harsh conditions and difficult control, and achieve the effects of high water reduction rate, low water-cement ratio and freight saving.

Inactive Publication Date: 2012-07-04
SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main branches in the molecular structure of the water reducer are connected by amide bonds, and the water reducing performance is excellent, but the conditions in the process of preparing polymerizable monomers by amidation reaction are harsh and difficult to control

Method used

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  • Preparation method of amido polycarboxylic water-reducing agent
  • Preparation method of amido polycarboxylic water-reducing agent
  • Preparation method of amido polycarboxylic water-reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 235.5g of water into the three-necked flask, start stirring, and raise the temperature to 75°C-77°C. At the same time, the initiator solution obtained by dissolving 2.5g potassium persulfate in 30.0g water, the chain transfer agent solution obtained by dissolving 18.0g isopropanol in 60.0g water, and the solution obtained by dissolving 400.0g acrylic acid and 100.0g methacrylic acid in The monomer solution obtained in 154.0 g of water was added dropwise for 3 hours, and after the dropwise addition was completed, it was incubated for 2 hours to obtain a carboxyl group-containing polymer. Then add 1955.0g of amino-terminated polyether monomer A and 1000.0g of polyethylene glycol monomethyl ether with a molecular weight of 1000 into the above-mentioned three-necked flask, raise the temperature, and react under the conditions of 130°C to 140°C and -0.07Mpa to -0.08Mpa After 2 hours, cool down to 40°C and add 900.0g of 20% sodium hydroxide to bring the pH value of the so...

Embodiment 2

[0035] Add 235.5g of water into the three-necked flask, start stirring, and raise the temperature to 65°C-67°C. At the same time, the initiator solution obtained by dissolving 12.0g ammonium persulfate in 30.0g water, the chain transfer agent solution obtained by dissolving 6.0g hypophosphorous acid in 60.0g water, and the solution obtained by dissolving 300.0g acrylic acid and 200.0g methacrylic acid in 154.0 g were added dropwise. The monomer solution obtained in g water, the dropwise addition time is 5 hours, and after the dropwise addition is completed, it is incubated for 1 hour to obtain a carboxyl-containing polymer. Add 2490.0g of amino-terminated polyether monomer B, 810.0g of polyethylene glycol monoethyl ether with a molecular weight of 400, and 19.4g of catalyst p-toluenesulfonic acid into the above-mentioned three-necked flask. Mpa~-0.09Mpa conditions for 6 hours, lower the temperature to 50°C and add 560.0g of potassium hydroxide with a concentration of 30%, the ...

Embodiment 3

[0037] Add 235.5g of water into the three-necked flask, start stirring, and raise the temperature to 85°C-87°C. Add dropwise at the same time the initiator solution obtained by dissolving 9.0g hydrogen peroxide in 30.0g water, the chain transfer agent solution obtained by dissolving 3.0g mercaptoethanol in 60.0g water, and the solution obtained by dissolving 350.0g acrylic acid and 150.0g methacrylic acid in 154.0 g The monomer solution obtained in g water, the dropwise addition time is 2 hours, and after the dropwise addition is completed, it is incubated for 3 hours to obtain a carboxyl-containing polymer. Then add 3000.0g of amino-terminated polyether monomer C and 500.0g of polyethylene glycol monopropyl ether with a molecular weight of 2000 into the above-mentioned three-necked flask, raise the temperature, and react under the conditions of 160°C to 170°C and -0.03Mpa to -0.04Mpa After 7 hours, cool down to 30°C and add 445.0g of triethanolamine with a concentration of 40...

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Abstract

The invention relates to a preparation method of an amido polycarboxylic water-reducing agent. The preparation method comprises the following steps of: adopting a synthetic method with firstly polymerization and secondly functionalization, firstly forming a carboxylic polymer main chain, then carrying out grafting by amidation and esterification reaction with amino-terminated polyether and polyethylene glycol monoalkyl ether under certain temperature to introduce branched chains, and preparing the high-performance novel polycarboxylic water-reducing agent with jointed connection of the main chain and the branched chains by amide / imide bonds and ester bonds. According to the preparation method, the structure and the performance of the water-reducing agent are adjusted by molecular structure design, the reaction process is easy to control, the effect on environmental protection without pollution is achieved, the reaction conversion rate is high, the water reducing rate of a product is high, and under the conditions with low water-cement rate and low doping amount, the mortar doped with the amido polycarboxylic water-reducing agent has better fluidity compared with the common ester polycarboxylic water-reducing agent.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a preparation method of an amide polycarboxylate water reducer. Background technique [0002] Concrete admixtures play an indispensable role in modern construction projects, and polycarboxylate-based water reducers, as an important concrete admixture, are one of the important products in the pillar industry of new building materials. The polycarboxylate water reducer can not only provide a simple and easy construction process, greatly improve the mechanical properties of concrete, but also is non-toxic, environmentally friendly and pollution-free. The polycarboxylate water reducer products currently on the market are mainly the first generation polycarboxylate water reducer (methacrylic acid / methyl acrylate copolymer), the second generation polycarboxylate water reducer (propylene base ether copolymer), and although there has been a small amount of theoretical resear...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C08F220/06C04B24/26C04B103/30
Inventor 傅乐峰孔凡桃冯中军郑柏存
Owner SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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