Ether type polycarboxylic acid concrete water reducer containing chitosan and preparation method thereof

A technology of concrete water reducing agent and ether polycarboxylic acid, which is applied in the field of building material concrete, can solve the problems of low efficiency of thickener, complex production process, poor compatibility, etc., achieve the effect of increasing strength in the later period, and the synthesis process is simple , the effect of improving fluidity

Active Publication Date: 2016-09-21
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 water reducer 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, it is necessary to compound and use thickening components. However, both theoretical research and engineering practice have found that the compatibility between polycarboxylate water reducers and commonly used thickening components is poor, and thickening components The use of thickeners is not efficient, which brings great difficulty to the thickening compounding of polycarboxylate superplasticizers and makes the production process more complicated; in addition, polycarboxylate superplasticizers on the market now The synthesis process is mainly the product obtained by addition polymerization of petroleum-based monomers such as polyoxyalkylene ether unsaturated macromonomers and unsaturated carboxylic acid derivatives. The depletion of petroleum resources will make petroleum-based monomers The petrochemical industry with body as raw material is unsustainable
The introduction of marine material chitosan into polycarboxylate superplasticizer has not been reported at home and abroad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: 906g isopentenol polyoxyethylene ether (M n =2400), 66g of chitosan, 25g of unsaturated monocarboxylic acid acrylic acid were dissolved in 4.5kg of water under stirring, after it was completely dissolved, the reaction system was preheated and the temperature was controlled at 0-80°C, and then 100g of acrylic acid After mixing with 35g of unsaturated carboxylic acid derivatives, it was dropped into the reaction system. At the same time, 16.9g of cerium ammonium nitrate was dissolved in 100g of water, 20.1g of thioglycolic acid and 15.9g of ascorbic acid were dissolved in 80g of water, and 19.5g of hydrogen peroxide was dissolved in 100g of water. They were dropped into the mixed system to initiate the reaction. All the introduced substances are added dropwise within 30-80 minutes and the reaction is continued for 20-50 minutes, and the chitosan-containing ether polycarboxylate concrete water reducer is obtained after the product is cooled.

Embodiment 2

[0035] Example 2: 120g of water is preheated to 35°C, and then 60g of prenol polyoxyethylene ether macromonomer (M n =2400), 31g allyl polyoxyethylene ether (M n =3600), 1.86g chitosan and 1.8g unsaturated carboxylic acid derivatives, after the above mixture is completely dissolved, weigh 16.5g acrylic acid, 2g unsaturated ether and 10g water and mix them into the reaction system dropwise, and weigh the mercapto group Dissolve 0.8g of propionic acid and 1.8g of ascorbic acid in 20g of water and drop them into the reaction system; at the same time, mix 1.9g of hydrogen peroxide, 0.9g of potassium persulfate and 10g of water into the polymerization reaction system, and control the temperature not to exceed 80°C and the reaction time Cool the aqueous solution of the polymerized product within 2 hours to obtain a chitosan-containing ether polycarboxylate concrete water reducer.

Embodiment 3

[0036] Embodiment 3: 225g water is preheated to 40 ℃, drop into 105g allyl polyoxyethylene ether macromonomer (M n =2400) and 3.7g chitosan, 8g methacrylic acid, 0.9g unsaturated carboxylic acid derivatives, 1.6g unsaturated ether were stirred to dissolve, then 6.8g cetyl mercaptan, 7.8g cerium ammonium nitrate , 7.2g of ammonium persulfate, 25g of acrylic acid and 6g of maleic anhydride were respectively dissolved in 15g of water and added dropwise within 15-60 minutes. The temperature was controlled not to exceed 80°C and the reaction time was not to exceed 2 hours. After cooling, the chitosan-containing ether polycarboxylate concrete water reducer is obtained.

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PUM

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Abstract

The invention provides an ether type polycarboxylic acid concrete water reducer containing chitosan and a preparation method thereof. The concrete water reducer is a polymerization product, and is obtained by a polymerization reaction of the following components in percentage by mass: 0.02-12.6% of chitosan, 3-65% of a polyoxyalkylene based ether type unsaturated macromonomer, 1-40% of unsaturated carboxylic acid and/or unsaturated acid anhydride, 0.02-8% of an unsaturated carboxylic acid derivative and/or unsaturated ether, and 25-95% of water. The ether type polycarboxylic acid concrete water reducer provided by the invention has a simple synthetic process and a relatively low production cost; and the obtained water reducer not only has a high water reducing rate but also can obviously improve phenomena of easy segregation and easy bleeding of concrete to obviously improve workability and fluidity of concrete, and has a very significant effect of improving the long-term strength of concrete.

Description

【Technical field】 [0001] The invention belongs to the macromolecule fine chemical product in the technical field of building material concrete, is related to the application of chitosan, a marine material, and specifically relates to a chitosan-containing ether polycarboxylate concrete water reducer and a preparation method thereof. 【Background technique】 [0002] The application of water reducing agent in concrete can significantly improve the working performance of concrete, increase the strength and durability of concrete. Polycarboxylate high-performance water reducer is a new generation of water reducer developed after ordinary water reducers represented by wood calcium and high-efficiency water reducers represented by naphthalene series. With unique advantages such as water-reducing rate and environmental protection, it is a kind of concrete water-reducing agent that is the most advanced in the world, has excellent comprehensive performance and is widely used. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38C04B103/30
CPCC04B40/0039C04B2103/302C04B24/32C04B24/38C04B24/2641C04B24/04C04B22/085C04B24/16C04B22/068C04B24/023C04B22/14
Inventor 全志龙何中东
Owner HUAQIAO UNIVERSITY
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