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

Method for preparing sulfate-resistant polycarboxylate water-reducing agents and application thereof

A technology of sulfate polycarboxylic acid and water reducing agent, applied in the field of concrete admixtures, can solve the problems of insufficient water reducing effect, poor adaptability, poor sulfate resistance, etc., and achieves low slump loss, low production cost, cement good adaptability

Active Publication Date: 2016-06-29
JIANGSU SOBUTE NEW MATERIALS +1
View PDF8 Cites 25 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims to overcome the poor adaptability between existing polycarboxylate water-reducers and cement, especially the poor tolerance of polycarboxylates to sulfates and insufficient water-reducing effect, and provides a sulfate-resistant polycarboxylate water-reducer and Its preparation method, the sulfate-resistant polycarboxylate water reducer has the advantages of low dosage, high water reducing rate, small slump loss, good cement adaptability, sulfate resistance, etc., and the preparation process is simple

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 sulfate-resistant polycarboxylate water-reducing agents and application thereof
  • Method for preparing sulfate-resistant polycarboxylate water-reducing agents and application thereof
  • Method for preparing sulfate-resistant polycarboxylate water-reducing agents and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Combine 15.6g polyethylene glycol monomethyl ether methacrylate (Mn=500g / mol), 0.67g 4-cyano-4-(phenylthioformylthio)pentanoic acid and 0.06g azobisisobutyl Glyamidine hydrochloride and 36.4g of water are thoroughly mixed, and then N 2 Put O in solution 2 Discharge at N 2 The reversible addition-fragmentation chain transfer polymerization reaction is carried out under protection. The reaction temperature is 60℃, the reaction time is 9h, and the conversion rate of monomer a is 97.34%. The unreacted monomer and small molecules are removed by dialysis to obtain a large polyether monomer. Body-RAFT reagent (Mw=7.18kDa),

[0053] Adding 3.31 g acrylic acid (conversion rate 54.52%) and 9.67 g hydroxyethyl methacrylate phosphate (conversion rate 49.65%) to continue polymerization for 12 hours to obtain sulfate-resistant polycarboxylic acid water-reducing agent mother liquor (Mw=8.05kDa).

Embodiment 2

[0055] Combine 29.64g polyethylene glycol monomethyl ether acrylate (Mn=950g / mol), 0.28g 2-(phenylthioformylthio)propionic acid, 0.03g azobisisobutylamidine hydrochloride and 55g After the water is fully mixed, pass in N 2 Put O in solution 2 Discharge at N 2 The reversible addition-fragmentation chain transfer polymerization reaction is carried out under protection. The reaction temperature is 65℃, the reaction time is 8h, and the conversion rate of monomer a is 97.83%. The unreacted monomer and small molecules are removed by dialysis to obtain a large polyether monomer. Body-RAFT reagent (Mw=13.76kDa),

[0056] 37.49g of methacrylic acid (conversion rate of 60.46%) and 21.37g of hydroxyethyl acrylate phosphate (conversion rate of 56.37%) were added and polymerization was continued for 8 hours to obtain a sulfate-resistant polycarboxylic acid water-reducing agent mother liquor (Mw=31.09kDa).

Embodiment 3

[0058] Combine 29.64g polyethylene glycol monomethyl ether methacrylate (Mn=950g / mol), 0.17g 4-cyano-4-(phenylthioformylthio)pentanoic acid and 0.01g 4,4'-coupling Nitrobis(4-cyanovaleric acid) and 55g of water are thoroughly mixed, then pass in N 2 Put O in solution 2 Discharge at N 2 The reversible addition-fragmentation chain transfer polymerization reaction is carried out under protection. The reaction temperature is 70℃, the reaction time is 8h, and the conversion rate of monomer a is 97.34%. The unreacted monomer and small molecules are removed by dialysis to obtain a large polyether monomer. Body-RAFT reagent (Mw=28.73kDa),

[0059] 37.17g acrylic acid (conversion rate 50.95%) and 49.59g hydroxypropyl methacrylate phosphate (conversion rate 53.39%) were added to polymerize for 7 hours to obtain a sulfate-resistant polycarboxylic acid water reducing agent mother liquor (Mw=43.36kDa).

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
molecular weightaaaaaaaaaa
Login to View More

Abstract

The invention provides a method for preparing sulfate-resistant polycarboxylate water-reducing agents and application thereof. The sulfate-resistant polycarboxylate water-reducing agents comprise monomers a, monomers b and monomers c which are subjected to reversible addition-fragmentation chain transfer polymerization. The method and the application have the advantages that strong adsorption groups and phosphate groups are introduced into block polycarboxylate main chain structures definitely distributed on sequence structures, accordingly, block polycarboxylate is high in adsorption capacity, and the sulfate resistance of the block polycarboxylate can be improved; the sulfate-resistant polycarboxylate water-reducing agents are low in dosage and slump loss, high in water-reducing rate and good in cement adaptability and is sulfate-resistant, the method for synthesizing the sulfate-resistant polycarboxylate water-reducing agents is simple, is low in production cost and little in environmental pollution and has low technological requirements, and the like.

Description

Technical field [0001] The invention relates to the technical field of concrete admixtures in building materials, in particular to a preparation method and application of a sulfate-resistant polycarboxylic acid water-reducing agent that can be used as a concrete water-reducing agent. Background technique [0002] With the rapid development of my country's economy, modern buildings have shown a development trend of super large spans and super high-rise buildings, which put forward higher requirements for the strength and durability of concrete. The addition of high-performance polymer dispersants in concrete is the most effective, economical and simplest technical way to reduce the amount of cement, increase the utilization rate of industrial waste, and realize the high durability and performance of concrete. [0003] Polycarboxylate water-reducing agent has become an important component of modern high-performance concrete due to its excellent water-reducing and dispersing propertie...

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): C08F283/06C08F220/06C08F230/02C04B24/26C04B103/30
CPCC04B24/2605C04B2103/302C08F283/065C08F220/06C08F230/02
Inventor 王秀梅冉千平舒鑫张茜赵红霞严涵毛永琳
Owner JIANGSU SOBUTE NEW MATERIALS
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