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A kind of amphoteric high-performance polycarboxylate water reducer and its preparation method

A high-performance, polycarboxylic acid technology, applied in the field of preparation of amphoteric high-performance polycarboxylate water reducer, amphoteric high-performance polycarboxylate water reducer, can solve the problems of non-delay, difficult industrialization, high synthesis cost, etc. , to achieve high early compressive strength, mild reaction conditions and safe synthesis process

Active Publication Date: 2017-09-19
LIMING VOCATIONAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN200510037871.1 synthesized an amphoteric concrete that has strong adaptability and excellent slump retention with mineral admixtures, can effectively reduce the early hydration rate and heat release of cement, and does not delay the normal setting time of cement Superplasticizer, the main raw materials that can be synthesized rely on imports, and the cost is high. At the same time, the preparation has experienced the process of esterification, polymerization and then crosslinking. The synthesis process is complicated, the operability is not strong, and it is difficult to realize industrialization.
[0004] At present, the main problem in the synthesis of amphoteric high-performance polycarboxylate superplasticizers is that the synthesis cost is high, and it has been difficult to realize industrialization.

Method used

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  • A kind of amphoteric high-performance polycarboxylate water reducer and its preparation method
  • A kind of amphoteric high-performance polycarboxylate water reducer and its preparation method
  • A kind of amphoteric high-performance polycarboxylate water reducer and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Preparation of cationic active organic monomer

[0030] In a four-neck round-bottom flask, add water and dimethylaminoethyl acrylate, adjust the pH of the dimethylaminoethyl acrylate solution to 7 with dilute acid, then add the polymerization inhibitor, put in the stir bar, and then install the separator. Liquid funnel, monochloromethane gas pipe and tail gas outlet pipe, at room temperature, introduce monochloromethane gas through the gas pipe first, and then stop heating and introduction of monochloromethane gas when the solution is clear. After the reaction, add Large stirring power can remove the monochloromethane gas residue in the system, and the crude product of cationic active organic monomer can be obtained after the stirring time is extended by 0.5h. The crude product obtained is extracted, washed, separated under reduced pressure and dried under vacuum to obtain a refined product of cationic active organic monomer.

[0031] Preferably, the molar ratio of wate...

Embodiment 2

[0043] It is basically the same as Example 1, except that:

[0044] Preferably, the molar ratio of water to dimethylaminoethyl acrylate in the step (1) is 1.5:1.

[0045] Preferably, the polymerization inhibitor in the step (1) is a phenothiazine polymerization inhibitor, and the amount of the phenothiazine polymerization inhibitor is 0.25% of the mass of dimethylaminoethyl acrylate.

[0046] Preferably, the molar ratio of acrylic anionic monomer, polyethylene glycol monomethyl ether acrylate and cationic active organic monomer in the step (2) is 4.0:1.0:1.

[0047] Preferably, the amount of the composite initiator of ammonium peroxodisulfate and sodium bisulfite in the step (2) is 4.0% of the total mass of the reaction monomer.

Embodiment 3

[0049] It is basically the same as Example 1, except that:

[0050] Preferably, the molar ratio of water to dimethylaminoethyl acrylate in the step (1) is 1.5:1.

[0051] Preferably, the polymerization inhibitor in the step (1) is a hydroquinone polymerization inhibitor, and the amount of the hydroquinone polymerization inhibitor is 0.50% of the mass of dimethylaminoethyl acrylate.

[0052] Preferably, in the step (2), the molar ratio of acrylic acid anionic monomer, polyethylene glycol monomethyl ether acrylate and cationic active organic monomer is 6.0:1.5:1.

[0053] Preferably, the amount of the composite initiator of ammonium peroxodisulfate and sodium bisulfite in the step (2) is 5.0% of the total mass of the reaction monomer.

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Abstract

The invention discloses an amphiplilic high-performance polycarboxylate water reducer which has a structure as shown in the formula, wherein n is a natural number between 10-60, and x, y and z are positive integers; the invention further discloses a preparation method of the amphiplilic high-performance polycarboxylate water reducer, and the preparation method comprises the steps of preparing a cationic active organic monomer and preparing the amphiplilic high-performance polycarboxylate water reducer. The amphiplilic high-performance polycarboxylate water reducer provided by the invention is domestic in synthetic raw materials, safe in synthetic process, mild in reaction condition and free of environmental pollution; besides, when used in concrete, the obtained product has the characteristics of low dosage, high dispersion, high slump loss resistance, high water reduction, high early compressive strength and the like.

Description

Technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, and specifically relates to an amphoteric high-performance polycarboxylic acid water reducer. The invention also relates to a preparation method of an amphoteric high-performance polycarboxylic acid water reducer. Background technique [0002] With the acceleration of concrete technology progress, the development of a new generation of polycarboxylic acid superplasticizer has been promoted. At present, the polycarboxylic acid water-reducing agent on the market still has the defects of large dispersion, poor slump retention within 1 to 2 hours after mixing of ready-mixed concrete, low water reduction rate and early compressive strength, and it is difficult to meet the needs of ultra-high performance concrete. Therefore, the development of low cost, low dosage, high dispersion, high slump retention, high water reduction, and high early compressive strength can be widely used in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F290/06C08F220/06C08F220/32
CPCC04B24/2688C04B2103/302C08F290/062C08F220/06
Inventor 陈宝璠卓玲
Owner LIMING VOCATIONAL UNIV
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