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Amido crosslinked poly-carboxylic acid compound as well as production method and application thereof

A technology of carboxylic acid compound and polyamine compound, which is applied in the field of water reducer and amide-based cross-linked polycarboxylic acid compound, can solve the problems of large environmental impact, difficulty in mixing operation and release control, and chemical slow-release type water reducer. Few reports of water preparations and other issues

Active Publication Date: 2014-06-25
SHANGHAI TAIJIE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Slow-release superplasticizers can be divided into physical slow-release and chemical slow-release according to the mechanism. Among them, physical slow-release is mainly to coat the superplasticizer molecules inside the carrier, such as the slow-release superplasticizer disclosed in patent CN101337785A , the roasted product of layered double metal hydroxide is added to the water reducer solution, and the water reducer is wrapped into the interlayer during the reconstruction of the layered structure, which is greatly affected by the environment, and the mixing operation and release control are also limited. difficulties; chemical slow release mainly depends on ester groups, acid anhydrides and other groups that can be hydrolyzed under alkaline conditions or through the formation of complexes for slow release. Currently, there are few reports on chemical slow release water reducers

Method used

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  • Amido crosslinked poly-carboxylic acid compound as well as production method and application thereof
  • Amido crosslinked poly-carboxylic acid compound as well as production method and application thereof
  • Amido crosslinked poly-carboxylic acid compound as well as production method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Add 300g of allyl polyethylene glycol with a molecular weight of 1000 and 50g of sodium methallylsulfonate into the reaction vessel, add 200g of water, stir and raise the temperature to 60-80°C, and at the same time start to drop 85g of acrylic acid and initiator persulfuric acid 45g of 10wt% sodium solution was added dropwise for 60-120 minutes. After the dropwise addition was completed, the reaction was continued for 120-180 minutes, and the heating was stopped.

[0049] Cool to 30-40°C, add 10g of propylenediamine, stir, start to drop 45g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide (EDC) solution and 4-dimethylaminopyridine (DMAP) solution 10g, the solution concentration is 1wt%, the dropping time is 30-60min, continue to react for 60min-120min after dropping, add NaOH solution with a mass fraction of 30% to adjust the pH value to 6-7; add water to dilute to mass Fraction 30%, promptly obtains amide cross-linked slow-release polycarboxylate superplasticizer.

Embodiment 2

[0051] Add 300g of polyethylene glycol monomethyl ether acrylate with a molecular weight of 1000 into the reaction vessel, add 200g of water, stir and raise the temperature to 60-80°C, add 4g of initiator sodium persulfate, and start to add acrylic acid dropwise after it is fully dissolved 85g and 40g of 10wt% solution of chain transfer agent thioglycolic acid (mass ratio of chain transfer agent to initiator: 1:1), dropwise for 60-120min, continue to react for 120-180min after dropping, stop heating.

[0052] Cool to 30-40°C, add 7.4g of propylenediamine, stir, start to drop 40g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide (EDC) solution and 4-dimethylamino Pyridine (DMAP) solution 10g, the solution concentration is 1wt%, the dropwise addition time is 30-60min, after the dropwise addition, continue to react for 60min-120min, add NaOH solution with a mass fraction of 30% to adjust the pH value to 6-7; add water to dilute to If the mass fraction is 30%, the amide-based cross...

Embodiment 3

[0054] Add 300 g of allyl polyethylene glycol with a molecular weight of 1000 and 50 g of sodium methallyl sulfonate into the reaction vessel, add 200 g of water, stir and heat up to 60-80 ° C, and start to drop 60 g of aqueous solution of maleic anhydride and Initiator sodium persulfate 10wt% solution 45g, dropwise adding time 30-60min, continue to react for 180-240min after dropping, stop heating.

[0055] Cool to 30-40 degrees Celsius, add 8g of propylenediamine, stir, start to drop 4.14g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide (EDC) solution and 4-dimethylamino Pyridine (DMAP) solution 10g, the solution concentration is 1wt%, the dropwise addition time is 30-60min, after the dropwise addition, continue to react for 60min-120min, add NaOH solution with a mass fraction of 30% to adjust the pH value to 6-7; add water to dilute to If the mass fraction is 30%, the amide-based cross-linked slow-release polycarboxylate superplasticizer can be obtained.

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Abstract

The invention provides an amido crosslinked poly-carboxylic acid compound, a production method and application of the amido crosslinked poly-carboxylic acid compound; firstly, CH2=C(R1)-COOH, HOOC-CH=CH-COOM1, CH2=C(R3)-A-(B-O)n-R4, and CH2=C(R2)-CH2-SO3M2 are subjected to CO-polymerization, so as to obtain a poly-carboxylic acid single-strand water reducing agent; then, the carboxylic acid of the obtained single-strand is subjected to a reaction with diamine or poly-amine, and then subjected to crosslinking, finally the produced amido crosslinked poly-carboxylic acid compound is obtained; the obtained product can gradually hydrolyze under a alkaline environment, the poly-carboxylic acid molecules restore the single-strand comb-shaped structure, and are used as the water reducing agent to continuously supply polymer molecules adsorbed by cement particles.

Description

technical field [0001] The present invention relates to a compound that can be used as a cross-linked water reducer, in particular to an amido cross-linked polycarboxylic acid compound and its production method and application, especially in the field of water reducer. Background technique [0002] Water reducer is the most widely used concrete admixture with the largest amount. This type of compound can significantly improve the dispersion of cement through the effect of steric hindrance and electrostatic repulsion, reduce the amount of mixing water, and improve the structure of concrete. , thereby improving the mechanical properties of concrete. [0003] Since the appearance of the water reducer, it has roughly experienced three stages of development, which are lignosulfonate water reducer, naphthalene water reducer and polycarboxylate high efficiency water reducer. Polycarboxylate superplasticizers have gradually replaced traditional naphthalene superplasticizers in deve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/24C08L51/08C08F290/06C08F228/02C08F220/06C08F222/06C08F2/38C08K5/17C08K5/18C04B24/16C04B103/30
Inventor 朱伟亮邵越峰邵田云
Owner SHANGHAI TAIJIE CHEM
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