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
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  • 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

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  • 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
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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).

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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

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Application Information

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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
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