Preparation method and product of polycarboxylate superplasticizer comprising amido groups

A high-efficiency water reducer and polycarboxylate-based technology, applied in the field of concrete admixtures, can solve the problems of low polymerization reactivity, affecting the key performance of polycarboxylate-based water-reducers, polymer properties, etc., to achieve high initial Dispersion and dispersibility over time, excellent retarding effect, and effect of improving electrostatic repulsion

Active Publication Date: 2016-10-26
SHANGHAI TAIJIE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, acrylic acid, methacrylic acid, etc. can be self-polymerized or copolymerized, but the polymerization activity of raw materials such as maleic anhydride or maleic acid ester is low, and self-polymerization basically does not occur. It needs to be carried out at a higher reaction temperature (70~80°C); however, at this temperature, the properties of the obtained polymer will be affected, thereby affecting the key properties of the synthesized polycarboxylate water reducer

Method used

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  • Preparation method and product of polycarboxylate superplasticizer comprising amido groups

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[0024] In the first aspect, the present invention provides a method for preparing an amide-containing polycarboxylate superplasticizer, comprising the following steps:

[0025] (1) Add maleic anhydride and / or maleic anhydride esterification product and acrylamide into the reaction vessel, add water to fully dissolve, heat up to 70°C~85°C, stir mechanically, and drop potassium persulfate aqueous solution as an initiator at the same time , after dropping, continue mechanical stirring to carry out the polymerization reaction until the reaction is complete; cool down to room temperature, and post-process to obtain modified acrylamide;

[0026] (2) Add the modified acrylamide, unsaturated polyether, and unsaturated carboxylic acid into another reaction container, add deionized water, and stir to dissolve; then add vitamin C, stir to dissolve; then control When the temperature of the reaction solution reaches 15°C~35°C, add hydrogen peroxide dropwise and stir to carry out the copoly...

Embodiment 1

[0039] (1) Add 100g of maleic anhydride and 100g of acrylamide into the reaction vessel, add water to fully dissolve, raise the temperature to 75°C, stir mechanically, and at the same time add potassium persulfate aqueous solution as an initiator dropwise, and continue mechanically stirring for 60min after the dripping is completed. Carry out the polymerization reaction until the reaction is complete; cool down to room temperature, and perform post-treatment to obtain modified acrylamide;

[0040] (2) Add 100g of the modified acrylamide, 500g of prenyl polyoxyethylene ether (TPEG) with an average molecular weight of 2400, and 50g of acrylic acid into another reaction vessel, and add a certain amount of deionized water , fully stir to dissolve; then add 10g of vitamin C, stir to dissolve; then control the temperature of the reaction solution to 25°C, add 15g of hydrogen peroxide dropwise, and stir for 180min to carry out the copolymerization reaction;

[0041] (3) Add sodium hy...

Embodiment 2

[0043] (1) Add 100g of maleic anhydride esterification product and 100g of acrylamide into the reaction vessel, add water to fully dissolve, heat up to 80°C, stir mechanically, and at the same time add potassium persulfate aqueous solution as an initiator dropwise, after dropping, continue mechanically Stir for 75 minutes, carry out the polymerization reaction until the reaction is complete; cool down to room temperature, and perform post-treatment to obtain modified acrylamide;

[0044] (2) Add 100g of the modified acrylamide, 750g of methallyl polyoxyethylene ether (HPEG) with an average molecular weight of 3600, and 50g of methacrylic acid into another reaction vessel, and add a certain amount of Deionized water, fully stir to dissolve; then add 15g of vitamin C, stir to dissolve; then control the temperature of the reaction solution to 20°C, add 25g of hydrogen peroxide dropwise, and stir for 210min to carry out the copolymerization reaction;

[0045] (3) Add sodium hydrox...

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Abstract

The invention provides a preparation method of polycarboxylate superplasticizer comprising amido groups, which synthesizes a target product by using two steps: first, polymerizing maleic anhydride and/or maleic anhydride esterification product with acrylamide to obtain modified acrylamide, subjecting the modified acrylamide to free radical copolymerization with unsaturated polyether and unsaturated carboxylic acid to finally synthesize the polycarboxylate superplasticizer comprising amide groups; when applied to concrete, the polycarboxylate superplasticizer comprising amido groups presents excellent retarding effect, presents higher initial dispersibility and time-dependent dispersibility of cement mortar than conventional polycarboxylate water reducers, and accordingly has a promising application prospect.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, and in particular relates to a preparation method of an amide group-containing polycarboxylic acid-based high-efficiency water reducer, and a product prepared according to the method. Background technique [0002] Polycarboxylate superplasticizer is currently the most widely used concrete admixture with the largest amount. As of the end of 2015, its usage has exceeded 72.9% of the total domestic concrete admixture usage, and it shows a growing trend year by year. At present, with the development of synthesis technology, the types of polycarboxylate superplasticizers are increasing rapidly, and there is a development trend that high-end products are superior to low-end products, and functional admixtures are superior to widely applicable admixtures. [0003] Polycarboxylic acid-based water reducers usually use unsaturated carboxylic acids, such as acrylic acid, methacrylic acid, maleic anhydride...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F291/12C08F220/06C08F220/56C08F222/06C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F220/56C08F222/06C08F265/10C08F267/04C08F283/065C08F220/06
Inventor 朱伟亮孙振平邵越峰
Owner SHANGHAI TAIJIE CHEM
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