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Hyperbranched polyamine-ester-type polycarboxylate superplasticizer and preparation method thereof

A technology of ester type polycarboxylic acid and high-efficiency water-reducing agent, applied in the field of water-reducing agent, can solve problems such as limiting steric hindrance, and achieve the effects of increasing steric hindrance, promoting hydration, and improving dispersibility

Active Publication Date: 2019-08-09
江苏连外实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have shown that steric hindrance is the main mechanism of action, and the comb-like long-chain structure of polycarboxylate superplasticizers greatly limits the improvement of steric hindrance

Method used

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  • Hyperbranched polyamine-ester-type polycarboxylate superplasticizer and preparation method thereof
  • Hyperbranched polyamine-ester-type polycarboxylate superplasticizer and preparation method thereof
  • Hyperbranched polyamine-ester-type polycarboxylate superplasticizer and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation method of hyperbranched polyamine-ester type polycarboxylic acid superplasticizer of the present invention comprises the following steps:

[0023] 1) Preparation of hyperbranched polyamine-ester polymer: under nitrogen protection, dissolve 0.6 mol diethanolamine in 0.2 mol anhydrous methanol, add dropwise 0.6 mol methyl acrylate, keep warm at 40°C for 6 hours, pass Preparation of AB by Michael addition reaction 2 Monomer (N,N-dihydroxyethyl-3-aminopropionic acid methyl ester), and then 40 ° C rotary evaporation to remove methanol; then 0.3molAB 2 Mix the monomer with 0.1mol trimethylolpropane, add 0.01mol p-toluenesulfonic acid as a catalyst, keep the reaction at 120°C for 3h, and put it in a vacuum drying oven at -0.1MPa and 120°C for 1h and take it out , to obtain a hyperbranched polyamine-ester polymer;

[0024] 2) Preparation of hyperbranched polyamine-ester polycarboxylic acid superplasticizer: 0.3mol acrylic acid, 0.1mol hyperbranched polyamine-e...

Embodiment 2

[0037] The preparation method of hyperbranched polyamine-ester type polycarboxylic acid superplasticizer of the present invention comprises the following steps:

[0038] 1) Preparation of hyperbranched polyamine-ester polymer: under the protection of nitrogen, 0.6 mol of diethanolamine was dissolved in 0.2 mol of anhydrous methanol, then 0.6 mol of methyl acrylate was added dropwise, and the reaction was kept at 40°C for 6 hours. Preparation of AB by Michael addition reaction 2Monomer, and then 40 ° C rotary evaporation to remove methanol; then 0.6molAB 2 Mix the monomer with 0.1mol trimethylolpropane, add 0.01mol p-toluenesulfonic acid as a catalyst, keep the reaction at 120°C for 3h, and put it in a vacuum drying oven at -0.1MPa and 120°C for 1h and take it out , to obtain a hyperbranched polyamine-ester polymer;

[0039] 2) Preparation of hyperbranched polyamine-ester polycarboxylic acid superplasticizer: 0.5mol acrylic acid, 0.05mol hyperbranched polyamine-ester polymer ...

Embodiment 3

[0048] The preparation method of hyperbranched polyamine-ester type polycarboxylic acid superplasticizer of the present invention comprises the following steps:

[0049] 1) Preparation of hyperbranched polyamine-ester polymer: under nitrogen protection, 0.6 mol diethanolamine was dissolved in 0.15 mol anhydrous methanol, then 0.3 mol methyl acrylate was added dropwise, and the reaction was kept at 40°C for 6 hours. Preparation of AB by Michael addition reaction 2 Monomer, and then 40 ° C rotary evaporation to remove methanol; then 0.3molAB 2 Mix the monomer with 0.1mol trimethylolpropane, add 0.01mol p-toluenesulfonic acid as a catalyst, keep the reaction at 120°C for 3h, and put it in a vacuum drying oven at -0.08MPa and 120°C for 1h and take it out , to obtain a hyperbranched polyamine-ester polymer;

[0050] 2) Preparation of hyperbranched polyamine-ester type polycarboxylic acid superplasticizer: 0.5mol acrylic acid, 0.05mol hyperbranched polyamine-ester polymer and 0.1m...

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Abstract

The invention discloses a hyperbranched polyamine-ester-type polycarboxylate superplasticizer and a preparation method thereof. During preparation, firstly, diethanol amine is dissolved in anhydrous methanol, organic monoester is added dropwise to prepare an AB2 monomer, then the AB2 monomer is mixed with trimethylolpropane and a catalyst to prepare a hyperbranched polyamine-ester polymer, finally, an ester macromonomer, the hyperbranched polyamine-ester polymer and an unsaturated acid micromonomer are mixed and prepared into a solution A, the solution A and an initiator solution are added toa chain transfer agent solution to prepare the hyperbranched polyamine-ester-type polycarboxylate superplasticizer. The hyperbranched polyamine-ester-type polycarboxylate superplasticizer is of a highly-branched structure similar to that of a hyperbranched polymer, a new molecular structure is provided, the steric hindrance function between molecules of the superplasticizer and cement particles isimproved, and the water reducing function of the superplasticizer is improved.

Description

technical field [0001] The invention belongs to the field of water reducers, in particular to a hyperbranched polyamine-ester type polycarboxylic acid high-efficiency water reducer and a preparation method thereof. Background technique [0002] With the development of economy and society, people have higher and higher requirements for the construction industry. The development of the construction industry is inseparable from the development of concrete technology, and the development of concrete technology is inseparable from the development of concrete admixtures. Water reducing agent refers to reducing the amount of mixing water, changing the setting time, and improving the strength of concrete when the amount of cement and sand remains unchanged; it hinders the surface of cement particles through surface activity, electrostatic repulsion, or steric hindrance. The flocculation effect improves the dispersion of cement particles, thereby increasing the strength of concrete ...

Claims

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Application Information

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IPC IPC(8): C08F283/00C08F290/06C08F220/06C08F228/02C04B24/16C04B103/30
CPCC04B24/165C04B2103/302C08F283/00C08F290/062C08F220/06C08F228/02
Inventor 吴其胜顾斌诸华军杨涛
Owner 江苏连外实业有限公司