Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for synthesizing polycarboxylate superplasticizer through RAFT method

A technology of polycarboxylic acid and water reducing agent, applied in the field of polycarboxylic acid water reducing agent, can solve problems such as few research reports, and achieve the effects of high chain transfer efficiency, simple process and mild reaction conditions

Active Publication Date: 2015-12-16
SOUTH CHINA UNIV OF TECH +1
View PDF4 Cites 27 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing reports on aqueous RAFT living polymerization, there are few reports on the one-step formation of polymers from multiple monomers

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
  • Method for synthesizing polycarboxylate superplasticizer through RAFT method
  • Method for synthesizing polycarboxylate superplasticizer through RAFT method
  • Method for synthesizing polycarboxylate superplasticizer through RAFT method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The preparation of embodiment 1 polycarboxylate water reducer

[0051] (1) Add 120g of TPEG macromonomer into the reactor, add 117.5g of water, place the reactor in a water bath and heat it to 80°C, and keep stirring;

[0052] (2) Mix 14.4g of acrylic acid and 40g of water evenly, add 2.256g of BDATT into the mixture to dissolve, and add dropwise for 3 hours at a constant speed;

[0053] (3) 0.5424g of azobisisobutylamidine dihydrochloride was dissolved in 20g of water, and the solution in step (2) was dropped into the reaction kettle of step (1) at a constant speed at the same time, and the dropping time was 3h;

[0054] (4) After the dropwise addition, the constant temperature stirring reaction was continued for 4h;

[0055] (5) After the reaction is finished, add 30% NaOH aqueous solution and 10 g of water by mass fraction, and cool down to room temperature to obtain a polycarboxylate water reducer.

Embodiment 2

[0056] The preparation of embodiment 2 polycarboxylate superplasticizer

[0057] (1) Add 120g of TPEG macromonomer into the reactor, add 137.5g of water, place the reactor in a water bath and heat it to 80°C, and keep stirring;

[0058] (2) Mix 14.4g of acrylic acid with 30g of water evenly, add 2.256g of BDATT into the mixture to dissolve, and add dropwise for 3 hours at a constant speed;

[0059] (3) 0.2282g of ammonium persulfate is dissolved in 20g of water, and the solution in step (2) is started to be added dropwise to the reaction kettle of step (1) at the same time, and the dropping time is 3h;

[0060] (4) After the dropwise addition, the constant temperature stirring reaction was continued for 5h;

[0061] (5) After the reaction is finished, add a 30% NaOH aqueous solution by mass fraction, and cool down to room temperature to obtain a polycarboxylate water reducer.

Embodiment 3

[0062] The preparation of embodiment 3 polycarboxylate superplasticizer

[0063] (1) Add 120g of TPEG macromonomer into the reactor, add 117.5g of water, place the reactor in a water bath and heat it to 80°C, and keep stirring;

[0064] (2) Mix 14.4g of acrylic acid and 40g of water evenly, add 1.128g of BDATT into the mixture to dissolve, and add dropwise at a constant speed for 3 hours;

[0065] (3) 0.1356g of azobisisobutylamidine dihydrochloride was dissolved in 20g of water, and the solution in step (2) was dropped into the reactor of step (1) at a constant speed at the same time, and the dropping time was 3h;

[0066] (4) After the dropwise addition, the constant temperature stirring reaction was continued for 5h;

[0067] (5) After the reaction is finished, add 30% NaOH aqueous solution and 10 g of water by mass fraction, and cool down to room temperature to obtain a polycarboxylate water reducer.

[0068] figure 1 Infrared spectrum comparison chart of PCE prepared f...

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

No PUM Login to View More

Abstract

The invention discloses a method for synthesizing polycarboxylate superplasticizer through a RAFT method. According to the method, firstly, macro-monomers A are added into a reaction kettle, water is added, water bath heating is performed till the temperature is 65-85 DEG C, and constant-temperature stirring is performed; then, a trithio ester chain transferring agent is dissolved in a mixed solution of micro-monomers B and water, the mixture is dropwise added into the reaction kettle at constant speed, and meanwhile an initiator aqueous solution is dropwise added; after all the needed matter is dropwise added, a stirring reaction lasts for 3-5 h under the continuous constant-temperature stirring condition of 65-85 DEG C; after the reaction ends, an alkali solution and water are added to adjust PH to 6-7, and the polycarboxylate superplasticizer is obtained after reaction products are cooled to room temperature. By means of the method, the molecular-structure-controllable polycarboxylate superplasticizer can be prepared, the molecular weight is controllable, the molecular weight distribution range is narrow, polymer molecule design can also be performed, and the method has great significance in research and development of the polycarboxylate superplasticizer synthetic technology.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer, in particular to a method for synthesizing a polycarboxylate water reducer (PCE) using a reversible addition-fragmentation chain transfer polymerization (RAFT) method, and belongs to the technical field of concrete chemical admixtures. Background technique [0002] Water reducing agent is known as the fifth component of concrete and plays an important role in the development of concrete. Polycarboxylate superplasticizer has the application advantages of low dosage in concrete, high water reducing rate, small slump loss over time, small concrete shrinkage rate, etc., as well as the synthesis advantages of strong variability in its own molecular structure. Research hotspots at home and abroad. Many scholars are trying to analyze the molecular structure information of PCE. The molecular structure of PCE includes molecular weight, molecular weight distribution, functional groups, side chain density...

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
IPC IPC(8): C08F283/06C08F220/06C08F2/38C04B24/26C04B103/30
Inventor 吴笑梅余文志樊粤明
Owner SOUTH CHINA UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com