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Preparation method and application of a concrete plasticizer with improved clay adaptability

A technology for concrete and plasticizer, applied in the field of concrete admixtures, can solve the problems of water reduction, poor slump retention ability of concrete, loss of dispersing ability of polymers, etc.

Active Publication Date: 2020-10-23
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Patent document CN102239127A reports a type of water reducer with phosphonate as the main chain adsorption group. This type of water reducer has better raw material adaptability, but the initial water reduction is lower than that of conventional carboxylic acid water reducers. And the concrete has poor slump retention ability in the later stage, which is mainly due to the weak adsorption of phosphate ester and easy hydrolysis, especially in the cement system (pH>14 in a strong alkali environment), after the main chain phosphate ester is hydrolyzed, the polymer part or all loses its dispersion ability

Method used

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  • Preparation method and application of a concrete plasticizer with improved clay adaptability
  • Preparation method and application of a concrete plasticizer with improved clay adaptability
  • Preparation method and application of a concrete plasticizer with improved clay adaptability

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preparation example Construction

[0060] Preparation of monomer a-2, Mw=2000, starting agent phenol (monomer A2-1): the preparation method is an ethoxylation method, and the preparation of phenoxy polyethylene glycol (Mw=2000) is used here Described as an example. Initiator phenol, catalyst sodium hydroxide. 94 g of phenol and 3 g of sodium hydroxide were weighed, the above materials were added to the reaction kettle, and the reaction kettle was evacuated to -0.1 MPa at room temperature. Then the reaction kettle was heated to 100° C., 50 g of ethylene oxide was introduced into the reaction kettle, and the polymerization reaction started when the pressure in the reaction kettle dropped and the temperature rose. Continue to feed 1856g of ethylene oxide into the reaction kettle. During the feeding process, keep the temperature of the reaction kettle between 100 and 120 °C and the pressure between 0.2 and 0.4 MPa. After the ethylene oxide feeding is completed, keep the temperature at 100 °C for about 1 hour. . ...

Embodiment 1

[0070] In this embodiment, a-1%=50%, a / b=1:2, (a+b) / d=1:1.0, e-2 / e-1=10%, e / a=0.55, c / b=0.15.

[0071] In a 1000ml four-necked flask equipped with electromechanical stirring and constant temperature heating oil bath, add Monomer A1-1260g (0.125mol), Monomer A2-3250g (0.125mol), Monomer B-1 112g (0.50mol) , concentrated sulfuric acid 12.5g (98% concentration) (0.125mol), FeCl 3 2.03g (0.0125mol), monomer C-510.35g (0.075mol), heat and stir until it is a homogeneous phase. Subsequently, 60.75 g (0.75 mol) of a 37% aqueous formaldehyde solution was slowly added dropwise. After the dropwise addition, the reaction was carried out at 115°C for 5 hours. After the reaction is completed, it is diluted with 30% alkali solution to pH about 10, and the reaction is continued at 105° C. for 0.5-1 hour to remove unreacted formaldehyde. The reaction was cooled to room temperature and diluted with water to about 30%-40%.

Embodiment 2

[0073] In this embodiment, a-1%=50%, a / b=1:2, (a+b) / d=1:1.0, e-2 / e-1=10%, e / a=0.55, c / b=0.15.

[0074] In a 1000ml four-necked flask equipped with an electric-mechanical stirring and constant temperature heating oil bath, add monomer A1-2135g (0.125mol), monomer A2-2 125g (0.125mol), monomer B-1 112g (0.50mol) ), concentrated sulfuric acid (98% concentration) 12.5g (0.125mol), Cu(NO 3 ) 2 2.33g (0.0125mol), monomer C-510.35g (0.075mol), heat and stir until it is a homogeneous phase. Subsequently, 60.75 g (0.75 mol) of a 37% aqueous formaldehyde solution was slowly added dropwise. After the dropwise addition, the reaction was carried out at 115°C for 5 hours. After the reaction is completed, it is diluted with 30% alkali solution to pH about 10, and the reaction is continued at 105° C. for 0.5-1 hour to remove unreacted formaldehyde. The reaction was cooled to room temperature and diluted with water to about 30%-40%.

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Abstract

The invention provides a preparation method and an application of a concrete plasticizer with improved clay adaptability. The concrete plasticizer serves as a dispersing agent of water dispersion of ahydraulic binding agent and / or a potential hydraulic binding agent, and has good clay adaptability, better water reducing capability and higher slump loss resistance. The preparation method comprisesthe step of allowing an ingredient a, a monomer b, a monomer c and aldehyde d to give a copolycondensation under the condition of a combined catalyst e to form the concrete plasticizer. The weight-average molecular weight of the concrete plasticizer is 10000-40000; the ingredient a comprises an aryl polyether monomer a-1 with a terminal subjected to phosphonate esterification, and an optional aryl polyether monomer a-2 with hydroxyl as a terminal; the monomer b is an aryl monomer with a carboxylic ester group; the monomer c is an aryl monomer with COOH, SO3H or OPO3H2; and the combined catalyst e is a composition of protonic acid e-1 and non-protonic acid e-2.

Description

technical field [0001] The invention relates to a preparation method and application of a concrete plasticizer with improved clay adaptability, and belongs to the technical field of concrete admixtures. Background technique [0002] In August 2015, the state put forward the great strategic concept of "Silk Road Economic Belt" and "21st Century Maritime Silk Road". Around this strategy, the number of state-contracted engineering projects exceeded 3,000, which brought huge benefits to the construction concrete industry. opportunity. The consumption rate of concrete at home and abroad has increased significantly, and the level of concrete application technology has also been continuously developed. Among many concrete admixtures, water reducer is the most widely studied and used admixture. The water reducing agent is essentially a surfactant, which mainly improves the fluidity of concrete, controls the setting or hardening time, and improves the strength of concrete. [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/16C04B24/24C08G8/38C08G65/26C08G65/335C04B103/30
CPCC04B24/166C04B24/246C04B2103/30C08G8/38C08G65/2612C08G65/3353
Inventor 王涛冉千平马建峰亓帅王兵范士敏韩正
Owner JIANGSU SOBUTE NEW MATERIALS
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