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Early-strength-type polycarboxylic acid high-performance water reducer and preparation method thereof

A technology of polycarboxylic acid and water reducing agent is applied in the field of concrete admixtures, which can solve the problems of early strength effect and material environmental adaptability that cannot meet the market application requirements of early strength and super early strength concrete, and achieves the effect of simple steps.

Active Publication Date: 2018-10-30
广东瑞安科技实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned early-strength polycarboxylate superplasticizers can achieve early-strength effects to a certain extent by introducing small-molecule amide and sulfonic acid groups during compounding or synthesis, but in terms of early-strength effects and material environmental adaptability However, it cannot meet the increasingly stringent market application requirements of early-strength and super-early-strength concrete

Method used

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  • Early-strength-type polycarboxylic acid high-performance water reducer and preparation method thereof
  • Early-strength-type polycarboxylic acid high-performance water reducer and preparation method thereof
  • Early-strength-type polycarboxylic acid high-performance water reducer and preparation method thereof

Examples

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Effect test

Embodiment 1

[0054] An early-strength polycarboxylate high-performance water reducer, the synthetic raw material contains a large molecular weight isopentenyl polyoxyethylene ether macromonomer and a dendritic macromolecular comonomer with methacrylic acid-terminated butylenediamine as the core .

[0055] The synthetic raw material also contains unsaturated sodium sulfonate comonomer, unsaturated carboxylic acid comonomer, initiator, reducing agent, chain transfer agent, liquid caustic soda and water.

[0056] The molecular weight of the isopentenyl polyoxyethylene ether macromonomer with large molecular weight is 4000-6000.

[0057] The butanediamine of methacrylic acid end-capping is the chemical formula of the dendritic macromolecule comonomer of nucleus as follows:

[0058]

[0059] In parts by mass, the ratio of synthetic raw materials is,

[0060] Large molecular weight isopentenyl polyoxyethylene ether macromonomer: 350-400 parts;

[0061] Dendritic macromolecular comonomer with...

Embodiment 2

[0095] A preparation method of an early-strength polycarboxylate high-performance water reducer, comprising the following steps,

[0096] (1) Preparation of methacrylic acid-terminated butanediamine as a core dendritic macromolecular comonomer: add 25 parts of methanol A and 6.5 parts of butanediamine A to the reactor, and stir at 50°C until butanediamine A was completely dissolved, and 36 parts of methyl methacrylate was added dropwise for 0.5 h, and the reaction was carried out at 50°C for 10 h, and the intermediate I was obtained by distillation under reduced pressure.

[0097] Add a solution prepared by adding 32 parts of butanediamine B and 30 parts of methanol B to intermediate I, react at 90°C for 10 hours, and distill under reduced pressure to obtain intermediate II;

[0098] Add 6 parts of methacrylic acid and 0.2 parts of inhibitor hydroquinone to intermediate II, N 2 Under the atmosphere, stirred at 70°C for 3h, and distilled under reduced pressure to obtain a dend...

Embodiment 3

[0101] A preparation method of an early-strength polycarboxylate high-performance water reducer, comprising the following steps,

[0102] (1) Preparation of methacrylic acid-terminated butanediamine as a core dendritic macromolecular comonomer: add 20 parts of methanol A and 8 parts of butanediamine A to the reactor, stir until butanediamine is stirred at 55°C A was completely dissolved, and 35 parts of methyl methacrylate was added dropwise for 0.5 h, and the reaction was carried out at 55°C for 12 h, and intermediate I was obtained by distillation under reduced pressure.

[0103] Add a solution prepared by adding 35 parts of butanediamine B and 25 parts of methanol B to intermediate I, react at 100°C for 12 hours, and distill under reduced pressure to obtain intermediate II;

[0104] Add 7 parts of methacrylic acid and 0.3 parts of inhibitor hydroquinone to intermediate II, N 2 Stirring at 80° C. for 4 h under the atmosphere, and distilling under reduced pressure to obtain ...

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Abstract

The invention discloses an early-strength-type polycarboxylic acid high-performance water reducer. The early-strength-type polycarboxylic acid high-performance water reducer is capable of, through introducing a dendritic macromolecule comonomer using methacrylic acid end-capped butanediamine as a nucleus, using an early strength feature of a hyperbranched and amide group of a dendritic macromolecule, and through introducing an isoprenyl polyoxyethylene ether macromonomer of a large molecular weight, using a long side chain steric hindrance and an early strength function thereof, finally further reinforcing the early strength effect by using an unsaturated sodium sulfonate micromolecule. The early-strength-type polycarboxylic acid high-performance water reducer is remarkable in early strength effect, and excellent in comprehensive performance. The invention further discloses a preparation method for the early-strength-type polycarboxylic acid high-performance water reducer. The preparation method is capable of firstly preparing the dendritic macromolecule comonomer using the methacrylic acid end-capped butanediamine as the nucleus, and preparing the early-strength-type polycarboxylic acid high-performance water reducer. The preparation method has the advantage of simple process.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to an early-strength polycarboxylate high-performance water reducer and a preparation method thereof. Background technique [0002] With the continuous development and improvement of concrete technology, concrete, as one of the commonly used building materials, has been widely used in more and more fields. At the same time, the performance of concrete has also put forward higher and higher requirements. Excellent workability, easy pumping construction, high strength, high durability and super early strength have attracted more and more attention. Early-strength and super-early-strength concrete have broad market application prospects in the construction and maintenance of highways, bridges, ports, prefabricated components, and prestressed high-strength pipe piles. Early-strength concrete develops rapidly. [0003] In traditional concrete design, the early strength is u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/06C08F228/02C04B24/16C04B103/30
CPCC04B24/165C04B2103/302C08F283/065C08F220/06C08F222/06C08F228/02
Inventor 仲以林陆智明巫晓鑫黄凯波蒙志泉何洞坤蔡冠杰邓焕友
Owner 广东瑞安科技实业有限公司
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