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Chitosan-containing polyether-type polycarboxylate superplasticizer and preparation method thereof

A technology of polyether carboxylic acid and chitosan, applied in the field of concrete admixtures, can solve the problems of low use efficiency of thickeners, poor workability, poor compounding compatibility, etc. Effects of sex and slump

Inactive Publication Date: 2018-08-10
HUAQIAO UNIVERSITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Concrete water reducer is an important component of modern concrete. Its development process has gone through lignin sulfonate, naphthalene sulfonate / sulfamate water reducer. At present, the admixture industry is mainly the third generation of polycarboxylic acid It is a superplasticizer. The excellent performance of this copolymerized polycarboxylate superplasticizer has been widely accepted. The use of polycarboxylate admixtures in the concrete industry can significantly improve the working performance of concrete and improve the quality of concrete. In addition, it has the advantages of low dosage, low mixing, high dispersion, high water reducing agent and environmental protection. It is the most cutting-edge concrete water reducing agent with excellent comprehensive performance and widely used in the world; currently The main problem encountered in the application of polycarboxylate water reducer is that the admixture is sensitive to the type of cement and the mud powder content of sand and gravel. The depletion of natural high-quality river sand resources and the decline in the quality of sand and gravel will directly affect The working performance of concrete using carboxylic acid admixtures, single use of polycarboxylate water reducers is difficult to meet the workability and self-consistent slump retention of commercial concrete, and the concrete mixture often causes bleeding and segregation, resulting in a Poor workability
In order to ensure that the concrete has good workability and improve the efficiency of construction and pouring, it is usually necessary to use thickening components for compounding, but both research and practice have found that the compounding of polycarboxylic acid-based admixtures and polysaccharide thickening components The compatibility is poor, and the use efficiency of the thickener is not high, which complicates the compound modification process of the polycarboxylate water reducer

Method used

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  • Chitosan-containing polyether-type polycarboxylate superplasticizer and preparation method thereof
  • Chitosan-containing polyether-type polycarboxylate superplasticizer and preparation method thereof
  • Chitosan-containing polyether-type polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0052] Example 1: 32 parts of isopentenol polyoxyethylene ether (Mn=2400), 0.6 part of chitosan, 0.6 part of acrylic acid were dissolved in 65 parts of water under stirring, and the reaction system was preheated and controlled after dissolution. The temperature is in the range of 20-60°C, then mix 4.5 parts of acrylic acid, 1.5 parts of maleic anhydride and 0.7 parts of unsaturated carboxylate derivatives containing epoxy groups and drop them into the monomer mixture, while adding 1.9 parts Initiating component solution A (initiating component A, wherein the weight ratio of ammonium persulfate and water is 1:10) and 1.9 parts of initiating component solution B (initiating component solution B consists of thioglycolic acid: ascorbic acid: water The weight ratio is 1.2:1:10), the trigger component solution A and the trigger component solution B were dropped into the mixing system to initiate the reaction. The introduced monomer or initiator is added dropwise within 30-80 minutes...

Embodiment 2

[0053] Example 2: Preheat 50 parts of water to 35°C, then add 16 parts of isopentenol polyoxyethylene ether macromonomer (Mn=2400), 16 parts of allyl polyoxyethylene ether macromonomer under stirring Monomer (Mn=3600), 0.36 parts of water-soluble chitosan and 0.34 parts of unsaturated ether derivatives containing epoxy groups, after the above mixture is dissolved, weigh 7 parts of methacrylic acid and drop into the reaction system, and weigh Get 8 parts of initiating component solution B (the parts by weight of initiating component solution B consist of mercaptopropionic acid: ascorbic acid: water=0.8:1.8:20) and drop into the reaction system; simultaneously 4.8 parts of initiating component solution A (initiating group The composition of the sub-solution A is hydrogen peroxide: potassium persulfate and: water = 1.9:0.9:10) introduced into the polymerization reaction system within 30 minutes, the temperature is controlled not to exceed 65 ° C, the reaction time is not to exceed...

Embodiment 3

[0054] Example 3: 35 parts of methallyl polyoxyethylene ether macromers (Mn=2400), 0.5 parts of epoxy-containing unsaturated carboxylic acid ester derivatives and 8 parts of epoxy-containing unsaturated Saturated ether derivatives, 9 parts of acrylic acid are dissolved in 30 parts of water under stirring, the reaction system is preheated and the temperature is controlled within the range of 0-60°C; then 2.5 parts of the initiator component solution B (initiator component solution The parts by weight of B are composed of thioglycolic acid: ascorbic acid: water=0.44:0.34:8) and 5 parts of initiating component solution A (the parts by weight of initiating component solution A are composed of hydrogen peroxide: water=0.28:1.76) respectively Add dropwise to the polymerization reaction system, and dropwise in 30-60min, continue to react after 20-80min, add 14.5 parts of chitosan solutions (the weight portion of chitosan solution is composed of chitosan: 1 % thioglycolic acid aqueous...

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Abstract

The invention discloses a chitosan-containing polyether-type polycarboxylate superplasticizer and a preparation method thereof. Functional modification is carried out on chitosan by using an epoxy group-containing unsaturated compound, then a copolymerization reaction is carried out on the chitosan subjected to the functional modification with acrylic acid monomers, methylacrylic acid monomers andpolyoxyalkylene-based ether unsaturated macromonomers, and the product is the chitosan-containing polycarboxylate superplasticizer; or a copolymerization reaction is carried out on the epoxy group-containing unsaturated compound with acrylic acid monomers, methylacrylic acid monomers and polyoxyalkylene-based ether unsaturated macromonomers, then a chitosan solution is added into the product forpolymerization, a modification reaction is carried out, and the chitosan-containing polycarboxylate superplasticizer is obtained. The superplasticizer prepared by the invention has high water reducingefficiency, can be used alone or in combination with a polycarboxylate superplasticizer, and can endow commercial concrete with the self consistency of workability and slump retaining performance.

Description

【Technical field】 [0001] The invention relates to the industry of concrete admixtures, and is an effective application technology for synthesizing concrete admixtures by using chitosan raw materials with low deacetylation degree, specifically a polyether-type carboxylic acid-based high-performance water reducer containing chitosan and its preparation method. 【Background technique】 [0002] Concrete water reducer is an important component of modern concrete. Its development process has gone through lignin sulfonate, naphthalene sulfonate / sulfamate water reducer. At present, the admixture industry is mainly the third generation of polycarboxylic acid It is a superplasticizer. The excellent performance of this copolymerized polycarboxylate superplasticizer has been widely accepted. The use of polycarboxylate admixtures in the concrete industry can significantly improve the working performance of concrete and improve the quality of concrete. In addition, it has the advantages o...

Claims

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Application Information

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IPC IPC(8): C08F291/06C08F220/06C08F222/06C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F251/00C08F283/065
Inventor 全志龙何中东卢其生张云波何奕聪苏秀贵范泽淇符丽艳马超凡陈峰儒李明玥王士斌
Owner HUAQIAO UNIVERSITY
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