Super-strong-adsorptivity concrete rheological agent and preparation method thereof

A technology of rheological agent and concrete, which is applied in the field of water reducing agent for cement concrete, can solve the problems of complex preparation engineering process, difficult industrial production, harsh reaction conditions, etc., achieve good controllability, reduce production volume, and operate simple effect

Active Publication Date: 2019-02-22
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The entire preparation process of this invention is complicated, cumbersome to operate, a large amount of organic solvents are used, the preparation cost is high, the reaction conditions are harsh and the product yield is low, so it is difficult to industrialize production

Method used

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  • Super-strong-adsorptivity concrete rheological agent and preparation method thereof
  • Super-strong-adsorptivity concrete rheological agent and preparation method thereof
  • Super-strong-adsorptivity concrete rheological agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Preparation of halogen-terminated polyether (ATRP initiator):

[0033] 10mol amino-terminated polyether (its R 1is methyl, m and n are both zero, p=10, and the weight average molecular weight is 500), 11mol1,3-butadiene diepoxide is stirred at normal temperature and pressure for 5h to carry out amino-epoxy ring-opening polymerization reaction , to realize the grafting of amino-terminated polyether on the main chain into a side chain polymer. After the reaction is completed, after dehydration and drying, 22mol 2-bromoisobutyryl chloride is added for esterification reaction for 0.5h to obtain bromo-terminated polyether (ATRP initiator).

[0034] 2) Preparation of super-absorbent concrete rheological agent:

[0035] React 10mol bromo-terminated polyether (ATRP initiator), 20mol acrylic acid and 0.1mol CuBr / pentamethyldiethylenetriamine (PMDETA) at 50°C for 120min, add sodium hydroxide to adjust the pH value to 6 to obtain a super strong Adsorption concrete rheologica...

Embodiment 2

[0037] 1) Preparation of halogen-terminated polyether (ATRP initiator):

[0038] 10mol amino-terminated polyether (its R 1 is methyl, m and n are both zero, p=17, and the weight average molecular weight is 800), 10.1mol1,5-hexadiene diepoxide is stirred at normal temperature and pressure for 1h to carry out amino-epoxy ring-opening polymerization The reaction is to realize the grafting of amino-terminated polyether on the main chain to form a polymer with side chains. After the reaction is completed, after dehydration and drying, 20.1mol 2-bromoisobutyryl bromide is added for esterification reaction for 0.1h to obtain terminal bromine based polyether (ATRP initiator).

[0039] 2) Preparation of super-absorbent concrete rheological agent:

[0040] React 10mol of bromo-terminated polyether (ATRP initiator), 26mol of methacrylic acid and 0.2mol of CuCl / HMTETA at 55°C for 240min, add sodium methoxide to adjust the pH value to 7, and obtain a superabsorbent concrete rheological a...

Embodiment 3

[0042] 1) Preparation of halogen-terminated polyether (ATRP initiator):

[0043] 10mol amino-terminated polyether (its R 1 is methyl, m=0, n=7, p=10, weight average molecular weight is 1000), 10.2mol bis(2,3-epoxycyclopentyl)ether was stirred at normal temperature and pressure for 5h for amino- Epoxy ring-opening polymerization reaction to realize the grafting of amino-terminated polyether on the main chain to form a side chain polymer. After the reaction is completed, after dehydration and drying, 21.1mol 2-bromoisobutyryl chloride is added for esterification reaction for 0.9h This results in a bromo-terminated polyether (ATRP initiator).

[0044] 2) Preparation of super-absorbent concrete rheological agent:

[0045] React 10mol of bromo-terminated polyether (ATRP initiator), 30mol of hydroxymethyl acrylate and 0.3mol of CuBr / tetrakis[(2-pyridyl)methyl]ethylenediamine (TPEN) at 60°C for 90min, add sodium ethoxide to adjust the pH A value of 7 means that a superabsorbent co...

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Abstract

The invention discloses a super-strong-adsorptivity concrete rheological agent and a preparation method thereof. The weight-average molecular weight of the rheological agent is 20000-80000. The rheological agent is prepared by the following steps: carrying out amino-epoxide ring-opening polymerization reaction by virtue of amino-terminal polyether and diepoxy oxide so as to obtain amino-terminal polyether grafted side chain polymer, carrying out esterification reaction modification on hydroxy generated through the amino-epoxide ring-opening polymerization reaction by virtue of halogenated alkyl acyl halide so as to obtain halogen-terminal polyether, and finally, carrying out atom transfer free radical polymerization reaction (ATRP), so as to obtain the super-strong-adsorptivity concrete rheological agent. By virtue of a large number of adsorption groups in the super-strong-adsorptivity concrete rheological agent, the electrostatic repulsion I enhanced, and the dispersing performance ofthe concrete rheological agent is improved; the dispersion holding capacity of the concrete rheological agent is improved by virtue of the strong steric hindrance; and the concrete rheological agenthas the advantages that the production process is good in controllability, the side effects are few, and the concrete rheological agent is strong in adaptability to different types of cement, high inwater-reducing rate and cost performance and obvious in competitive advantage.

Description

technical field [0001] The invention relates to the technical field of a water reducer for cement concrete, in particular to a method for preparing a polywater reducer by combining an amine-epoxy ring-opening polymerization reaction and an atom transfer radical polymerization reaction (ATRP). Background technique [0002] For the dispersibility, slump retention ability and mechanism of action of polycarboxylate superplasticizers, researchers at home and abroad have carried out extensive research on it and obtained many research results. The more consistent view is that polycarboxylate superplasticizers mainly pass through the space The steric hindrance effect disperses the cement particles, but the effect of the electrostatic repulsion cannot be ignored, which is related to the molecular structure of the water reducing agent. The premise of the dispersibility of polycarboxylate superplasticizer is its adsorption on the surface of cement particles, which will inevitably affec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/20C08F220/56C08F212/14C04B24/26C04B103/30
CPCC04B24/2605C08F283/065C04B2103/302C08F2438/01C08F212/22C08F212/14
Inventor 王子明钱珊珊崔素萍王亚丽毛倩瑾刘晓姚燕
Owner BEIJING UNIV OF TECH
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