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Preparation method of modified natural chitin-acrylic acid copolymer multifunctional organic anti-dispersing agent for underwater non-dispersed concrete

An anti-dispersant and chitin technology, which is applied in the field of concrete building material preparation, can solve the problems of difficult wide application, complex preparation process, high cost, etc., to improve the ability of anti-washing, simplify the preparation process, and improve the retention Effect

Active Publication Date: 2022-02-18
JINLING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the existing modified starch and cellulose compound as an organic anti-dispersant agent, which has complicated preparation process, high dosage, and needs to be compounded with polycarboxylate high-efficiency water reducer, and the cost is too high, so it is difficult to popularize and apply on a large scale Problem, a preparation method of a new type of modified natural chitin-acrylic acid copolymerized multifunctional organic anti-dispersion agent for underwater non-dispersible concrete is provided

Method used

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  • Preparation method of modified natural chitin-acrylic acid copolymer multifunctional organic anti-dispersing agent for underwater non-dispersed concrete
  • Preparation method of modified natural chitin-acrylic acid copolymer multifunctional organic anti-dispersing agent for underwater non-dispersed concrete
  • Preparation method of modified natural chitin-acrylic acid copolymer multifunctional organic anti-dispersing agent for underwater non-dispersed concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] see figure 1 According to the technical method described in the present invention, one ton of modified natural chitin-acrylic acid copolymer multifunctional organic anti-dispersion agent is produced, and the applied research on the influence of this kind of organic anti-dispersion agent on the performance of underwater concrete is carried out.

[0045] (1). Preparation of deacetylated chitin polymer

[0046] Weigh 240kg of chitin polymer (weight-average molecular weight: 335,400) and 760kg of water into a reaction vessel equipped with a stirrer, thermometer, dropping funnel, and reflux condenser, raise the temperature to 80°C, and accelerate the stirring of the mixture , so that the chitin polymer is evenly dispersed in water to form a uniform suspension. Add 325 kg of 40% sodium hydroxide solution by weight to the chitin high polymer suspension. Stirring for 16 hours at 80° C. removes the acetyl group in the chitin polymer to obtain a chitosan polymer suspension cont...

Embodiment 2

[0052] see figure 1 According to the technical method described in the present invention, one ton of modified natural chitin-acrylic acid copolymer multifunctional organic anti-dispersion agent is produced, and the applied research on the influence of this kind of organic anti-dispersion agent on the performance of underwater concrete is carried out.

[0053] (1). Preparation of deacetylated chitin polymer

[0054] Weigh 260kg of chitin polymer (weight-average molecular weight: 335,400) and 740kg of water into a reaction vessel equipped with a stirrer, thermometer, dropping funnel, and reflux condenser, raise the temperature to 85°C, and accelerate the stirring of the mixture , so that the chitin polymer is evenly dispersed in water to form a uniform suspension. Adding 350kg weight percentage concentration is 40% sodium hydroxide solution in chitin high polymer suspension. Stirring at 85° C. for 16 hours removes the acetyl group in the chitin polymer to obtain a suspension o...

Embodiment 3

[0060] see figure 1 According to the technical method described in the present invention, one ton of modified natural chitin-acrylic acid copolymer multifunctional organic anti-dispersion agent is produced, and the applied research on the influence of this kind of organic anti-dispersion agent on the performance of underwater concrete is carried out.

[0061] (1). Preparation of deacetylated chitin polymer

[0062] Weigh 250kg of chitin polymer (weight-average molecular weight: 335,400) and 750kg of water into a reaction vessel equipped with a stirrer, thermometer, dropping funnel, and reflux condenser, raise the temperature to 85°C, and accelerate the stirring of the mixture , so that the chitin polymer is evenly dispersed in water to form a uniform suspension. Adding 335kg weight percentage concentration is 40% sodium hydroxide solution in chitin polymer suspension. Stirring at 85° C. for 16 hours removes the acetyl group in the chitin polymer to obtain a suspension of chi...

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Abstract

The invention discloses a preparation method of a modified natural chitin-acrylic acid copolymerized multifunctional organic anti-dispersant agent for underwater non-dispersible concrete. First, the chitin polymer is deacylated under strong alkali conditions; then the hydrochloric acid and sodium periodate strong oxidant oxidize the hydroxymethyl group into a carboxyl group; finally, with the help of a composite inorganic chain initiator, the amine ring on the chitosan chain The carbon bond with hydroxyl and amino carbon atoms in the middle is oxidized and broken, and the unoxidized carbon atoms containing hydroxyl or amino groups generate primary free radicals, and the chitosan polymer and acrylic acid undergo a graft reaction to prepare Contains ‑COOH, ‑OH, ‑NH 2 Modified natural chitin-acrylic acid copolymerized multifunctional organic anti-dispersing agent. Adding this kind of organic anti-dispersion agent can significantly improve the anti-water dispersion performance of concrete, and also reduce water and improve the fluidity of concrete. No organic solvent is used in the preparation process of the organic anti-dispersant agent, the preparation process is simplified, the production process is green and environmentally friendly, and it has broad application prospects.

Description

technical field [0001] The invention relates to the technical field of preparation of concrete building materials, in particular to a preparation method of a modified natural chitin-acrylic acid copolymerized multifunctional organic anti-dispersant agent for underwater non-dispersible concrete. Background technique [0002] With the steady advancement of my country's "marine strategy", cement concrete materials, as the most widely used and used civil engineering materials, have been widely used in the construction of hydraulic structures such as ports, revetments, breakwaters, bridges, tunnels, and artificial islands. middle. However, it is worth noting that for the construction of underwater parts of hydraulic structures, when ordinary concrete is directly poured underwater, the washing of water will cause problems such as separation of concrete mortar aggregates, partial loss of cement, and decrease in strength. The traditional methods to solve the problem of underwater co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F220/06C04B24/38C04B103/44
CPCC08F251/00C04B24/38C04B2103/0059C04B2103/44
Inventor 赵晖陈达廖迎娣欧阳峰宣卫红徐海生
Owner JINLING INST OF TECH