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

Method for preparing star polycarboxylate water reducing agent

A technology of polycarboxylate and water reducer, which is applied in the field of polycarboxylate water reducer for cement concrete, and achieves the effects of high yield, high efficiency and simple operation

Active Publication Date: 2016-06-15
JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
View PDF12 Cites 38 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, no one in China has proposed to prepare a star-shaped multi-armed comb polycarboxylate superplasticizer with narrow distribution of polymerization products and controllable molecular weight and structure under the action of RAFT chain transfer agent and initiator.

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 preparing star polycarboxylate water reducing agent
  • Method for preparing star polycarboxylate water reducing agent
  • Method for preparing star polycarboxylate water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Preparation of star-shaped RAFT chain transfer agent: 1 mol of 3-methyl-1,3,5-pentanetriol, 3 mol of dodecyltrithioisobutyric acid and 0.03 mol of DMAP were subjected to esterification reaction at 0°C for 10 hours to obtain RAFT chain transfer agent;

[0028] 2) Preparation of star polycarboxylate superplasticizer: RAFT chain transfer agent obtained in 0.1mol step 1), 10mol acrylic acid, 20mol methallyl polyethylene glycol (300g / mol) and 0.01mol azobis React isobutyronitrile (AIBN) at 60°C for 3 hours, and add sodium hydroxide to adjust the pH to 7 to obtain a star-shaped polycarboxylate water reducer.

Embodiment 2

[0030] 1) Preparation of star-shaped RAFT chain transfer agent: 1mol of 1,2,5-pentanetriol, 3.1mol of 4-cyano-4-(dodecylsulfanylthiocarbonyl)sulfanylpentanoic acid and 0.04mol of DCC -DMAP (the molar ratio of EDC to DMAP is 1:1) was esterified at 25°C for 12 hours to obtain RAFT chain transfer agent;

[0031]2) Preparation of star polycarboxylate superplasticizer: RAFT chain transfer agent obtained in 0.1mol step 1), 10mol maleic anhydride, 30mol allyl polyethylene glycol (500g / mol) and 0.02mol diperoxide Benzoyl (BPO) was reacted at 80°C for 3 hours, and potassium hydroxide was added to adjust the pH value to 7 to obtain a star polycarboxylate superplasticizer.

Embodiment 3

[0033] 1) Preparation of star RAFT chain transfer agent: 1 mol of 1,2,3-pentanetriol, 3.01 mol of dithiobenzoic acid and 0.05 mol of EDC-DMAP (the molar ratio of EDC to DMAP is 1:1) at 20°C Esterification reaction 17h obtains RAFT chain transfer agent;

[0034] 2) Preparation of star polycarboxylate superplasticizer: RAFT chain transfer agent obtained in 0.1mol step 1), 30mol fumaric acid, 30mol3-methyl-3-butene-1-polyethylene glycol (1000g / mol) and 0.02mol potassium persulfate (K 2 S 2 0 8 ) at 60°C for 4 hours, and then add sodium hydroxide to adjust the pH to 6 to obtain a star-shaped polycarboxylate superplasticizer.

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 preparing a star polycarboxylate water reducing agent. The method comprises the following specific steps: performing an esterification reaction between polyalcoholic hydroxyl-containing organic molecules and a carboxyl-containing chain transfer agent under the effect of a catalyst to obtain a star RAFT chain transfer agent; enabling the star RAFT chain transfer agent, an unsaturated acid small monomer, an unsaturated macromonomer and an initiator to react for 3-5h at 60-90 DEG C; and adding alkali to adjust the pH value to 6-7 to obtain the star polycarboxylate water reducing agent. According to the method disclosed by the invention, the product performance is adjusted by controlling the temperature, monomer proportion and molecular weight of the macromonomer, the reaction is quick, the efficiency is high, and the operation is simple. The polycarboxylate water reducing agent prepared by the method is a functional polycarboxylate high-efficiency water reducing agent, and the product performance is stable.

Description

technical field [0001] The invention relates to the technical field of a polycarboxylate water-reducer for cement concrete, in particular to a method for preparing a star-shaped polycarboxylate water-reducer. Background technique [0002] Polycarboxylate high-performance water reducer (PCE) is a comb-shaped water-soluble polymer with aliphatic linear main chain connected to multiple polyoxyethylene / polyoxypropylene branch chains containing hydrophilic functional groups such as carboxylic acid groups. polymer. Because PCE has the advantages of environmental protection, superior performance, designability of molecular structure and performance, multi-functional serialization of products, etc., it is an important basic material and key technology for the preparation of high-performance concrete, which is important for ensuring the quality and quality of large-scale important infrastructure projects in my country Improving the service life is of great significance, represents th...

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): C08F283/06C08F290/06C08F220/06C08F222/06C08F220/02C08F228/02C08F212/14C08F220/58C08F2/38C04B24/32
CPCC04B24/32C04B2103/302C08F2/38C08F283/065C08F290/062C08F2438/03C08F220/06C08F228/02C08F212/14C08F220/585
Inventor 钱珊珊张岭丁蓓王毅姜海东郑春扬
Owner JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com