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Chitosan-containing ester polycarboxylate concrete admixture and preparation method thereof

A technology of concrete admixture and ester polycarboxylic acid, which is applied in the field of ester polycarboxylate concrete admixture and its preparation, can solve the problem of difficult to meet the cohesion and water retention requirements of ready-mixed concrete, thickening type compounding work Difficulty, bleeding of concrete mixture, etc., to achieve the effect of significant increase in strength in the later stage, improvement of easy segregation, and better flow performance

Active Publication Date: 2018-07-20
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, based on the influence of factors such as the development of concrete technology, market competition, cost control, and the reduction in the amount and quality of cementitious materials in commercial concrete, it is difficult for a single polycarboxylate admixture to meet the cohesion of ready-mixed concrete. Requirements for water retention and water retention, resulting in bleeding and segregation of the concrete mixture, resulting in poor workability
In order to ensure the normal construction of concrete and improve work efficiency, thickening components must be compounded. However, both research and practice have found that the compatibility between polycarboxylic acid-based admixtures and commonly used thickening components is poor, and thickening The efficiency of the use of additives is not high, which brings great difficulty to the thickening compounding of polycarboxylate additives and makes the production process more complicated; in addition, the current polycarboxylate additives in the market The synthesis process is mainly obtained by addition polymerization of petroleum-based monomers such as polyoxyalkylene ether unsaturated macromonomers and / or polyoxyalkylene ester unsaturated macromonomers, unsaturated carboxylic acid derivatives, etc. The depletion of petroleum resources will make it difficult for the petrochemical industry that uses petroleum-based monomers as raw materials to continue
The introduction of marine material chitosan into polycarboxylate additives has not been reported at home and abroad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: At normal temperature, 2.3kg monomethoxy ether monomethacrylate polyethylene glycol ester (M n =1200), 66g chitosan, 125g unsaturated monocarboxylic acid acrylic acid, 10.3g sodium propylene sulfonate, 25g unsaturated carboxylic acid derivatives are dissolved in 4.5kg water under stirring, after it dissolves completely, the reaction system Preheat and control the temperature within the range of 20-80°C, then dissolve 16.9g of ammonium cerium nitrate in 110g of water, 20.1g of mercaptoacetic acid in 60g of water, 12.5g of hydrogen peroxide in 80g of water, and 14g of ascorbic acid in 80g of water , introduced into the monomer mixed solution. The dropwise addition of all the raw material compounds introduced is completed within 20-80 minutes, and then the reaction is continued for 20-50 minutes, and the product is cooled to obtain the chitosan-containing ester polycarboxylate concrete admixture.

Embodiment 2

[0037] Example 2: 104g of water is preheated to 45°C, and then 70g of polyethylene glycol monomethacrylate (M n =1200) and 28g polyethylene glycol monoacrylate (M n =700), 2.86g chitosan and 1.2g acrylamide, after the above mixture is completely dissolved in aqueous solution, take by weighing 1.8g unsaturated carboxylic acid derivatization and 0.8g unsaturated ether and be dissolved in 10g water and introduce reaction system; 16.5g acrylic acid / mixed with 2g maleic anhydride and then introduced into the reaction system; weighed 1.8g of mercaptopropionic acid and 1.8g of ascorbic acid were dissolved in 15g of water and introduced into the reaction system; at the same time, mixed 0.9g of hydrogen peroxide with 10g of water and introduced into the polymerization reaction system, the temperature is controlled not to exceed 80 DEG C, the reaction time is not to exceed 2 hours, and the aqueous solution of the obtained polymerization product is cooled to obtain the chitosan-contain...

Embodiment 3

[0038] Embodiment 3: 205g water is preheated to 40 ℃, drop into 160g monoacrylic polyethylene glycol ester macromonomer (Mn =2400) and 35g polyethylene glycol monomethoxy monomethacrylate (M n =400), stir to make it dissolve completely, then add 2.3g chitosan, 38g methacrylic acid, 5.6g unsaturated ether, 3.2g allyl potassium sulfonate and 0.6g acrylamide, after mixing the above compounds uniformly , Dissolve 4.8g ammonium ferrous sulfate, 3.6g ammonium persulfate, and 15g acrylic acid in 18g water respectively, and add them dropwise to the obtained monomer mixture in 10-60 minutes, control the temperature not to exceed 75°C, and react for 2h Afterwards, the aqueous solution of the obtained polymer product is cooled to obtain the chitosan-containing ester polycarboxylate concrete admixture.

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PUM

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Abstract

The invention provides an ester polycarboxylate concrete additive containing chitosan, and a preparation method thereof. The additive is a polymerization product containing chitosan. By mass percentage, the additive is obtained through a polymerization reaction of the following raw materials: 0.02-12.6% of chitosan, 4-65% of polyoxyalkylene ester-type unsaturated macromonomer, 1-40% of unsaturated carboxylic acid and / or unsaturated anhydride, 0.02-8% of unsaturated carboxylic acid derivative or unsaturated ether, and 25-94% of water. Additionally, the additive comprises one selected from unsaturated sulfuric acid, unsaturated sulfonate and unsaturated amide accounting for 0.03-13% of the total mass of the additive. The additive provided by the invention has the advantages of simple preparation method and low production cost. The obtained additive has high water-reducing rate, and assists in substantially ameliorating concrete vulnerability to segregation and bleeding. With the additive, concrete workability is good, and concrete fluidity is substantially improved. The additive has a significant effect in improving concrete late strength.

Description

【Technical field】 [0001] The invention relates to polymer fine chemical products in the technical field of building materials concrete, in particular to a chitosan-containing ester polycarboxylate concrete admixture and a preparation method thereof. 【Background technique】 [0002] Graft copolymerization type polycarboxylate concrete admixture, its excellent performance has been gradually recognized by people. At present, this new type of admixture is mainly used in some large bridge projects, water conservancy projects, tunnel projects and a large number of industrial and civil buildings in China. The use of polycarboxylate admixtures in concrete can significantly improve the working performance of concrete, increase the strength and durability of concrete, and has unique advantages such as low dosage, high dispersion, high water reducing rate and environmental protection. It is the most advanced in the world today. It is a kind of concrete admixture which is cutting-edge, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38
CPCC04B40/0039C04B24/38C04B24/32C04B24/2641C04B24/16C04B24/04C04B22/085C04B22/068C04B24/2652C04B24/023C04B22/142C04B22/14
Inventor 全志龙何中东
Owner HUAQIAO UNIVERSITY