Preparation method and application of concrete plasticizer with improved clay adaptability

A concrete and plasticizer technology, applied in the field of concrete admixtures, can solve problems such as weak adsorption of phosphate ester, water reduction and poor slump retention ability of concrete

Active Publication Date: 2018-06-08
JIANGSU SOBUTE NEW MATERIALS +1
View PDF10 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method and application of concrete plasticizer with improved clay adaptability
  • Preparation method and application of concrete plasticizer with improved clay adaptability
  • Preparation method and application of concrete plasticizer with improved clay adaptability

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0059] Preparation of monomer a-2, Mw=2000, starter phenol (monomer A2-1): the preparation method is ethoxylation method, here is the preparation of phenoxy polyethylene glycol (Mw=2000) Take the description as an example. Starter phenol, catalyst sodium hydroxide. Weigh 94 g of phenol and 3 g of sodium hydroxide, add the above materials into the reaction kettle, and evacuate the reaction kettle to -0.1 MPa at room temperature. Then the reactor was heated to 100°C, and 50 g of ethylene oxide was introduced into the reactor. When the pressure in the reactor dropped and the temperature rose, the polymerization reaction started. Continue to feed 1856g of ethylene oxide into the reactor. During the feeding process, maintain the temperature of the reactor at 100~120℃ and the pressure at 0.2~0.4MPa. After the ethylene oxide feed is finished, keep the temperature at 100℃ for about 1h. . When the pressure of the reactor no longer decreases, reduce the temperature of the reactor to a...

Embodiment 1

[0069] 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.

[0070] 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. Then, 60.75 g (0.75 mol) of 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, it is diluted with 30% lye until the pH is about 10, and the reaction is continued at 105°C for 0.5-1 hour to remove unreacted formaldehyde. The reaction is cooled to room temperature and diluted with water to about 30%-40%.

Embodiment 2

[0072] 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.

[0073] In a 1000ml four-necked flask equipped with 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 (concentration 98%) 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. Then, 60.75 g (0.75 mol) of 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, it is diluted with 30% lye until the pH is about 10, and the reaction is continued at 105°C for 0.5-1 hour to remove unreacted formaldehyde. The reaction is cooled to room temperature and diluted with water to about 30%-40%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
specific surface areaaaaaaaaaaa
particle sizeaaaaaaaaaa
molecular weight distributionaaaaaaaaaa
Login to view more

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 conception of "Silk Road Economic Belt" and "21st Century Maritime Silk Road". Based on this strategy, the number of national contracted engineering projects exceeded 3,000, which has brought tremendous growth to the construction concrete industry. opportunity. The use of concrete at home and abroad has increased rapidly, and the level of concrete application technology is also constantly developing. Among the numerous concrete admixtures, water reducer is currently the most widely studied and used admixture. Water reducer is essentially a surfactant, which mainly improves the fluidity of concrete, controls the setting or hardening time, and improves the strength of concrete. [0003] Polycarb...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap