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Preparation method of modified natural chitin bio-based high-performance polycarboxylate water reducer

The technology of chitin and polycarboxylic acid is applied in the field of preparation of modified natural chitin bio-based high-performance polycarboxylate water reducing agent, which can solve the problems of single function, environmental pollution and high price.

Active Publication Date: 2020-10-30
JINLING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application of polycarboxylate superplasticizers in concrete materials can effectively improve the performance of concrete materials, but the raw materials for preparing polycarboxylate superplasticizers are mostly synthetic chemicals
Man-made chemicals are limited and expensive
Moreover, the preparation process of artificial chemicals is complicated, and the production process will cause pollution to the surrounding environment and harm people's health.
The traditional polycarboxylate high-efficiency superplasticizer has a single function and cannot have both water-reducing and retarding effects at the same time
These shortcomings hinder the wide application of polycarboxylate superplasticizer in concrete materials

Method used

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  • Preparation method of modified natural chitin bio-based high-performance polycarboxylate water reducer
  • Preparation method of modified natural chitin bio-based high-performance polycarboxylate water reducer
  • Preparation method of modified natural chitin bio-based high-performance polycarboxylate water reducer

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Experimental program
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Effect test

Embodiment 1

[0041] 1. Preparation of modified natural chitin bio-based high-performance polycarboxylate superplasticizer

[0042] 1.1. Preparation of amino chitin polymer

[0043] The chitin high polymer (weight average molecular weight: 335,400) of Nantong Langshan Xingcheng Biochemical Products Factory was used as a raw material. Weigh 300kg of chitin polymer and 700kg of water into a reaction vessel equipped with a stirrer, a thermometer, a dropping funnel, and a reflux condenser. Raise the temperature to 80°C and stir to form a uniform suspension solution. Raise the temperature to 138°C, add 1170kg of sodium hydroxide solution (50% by weight) to the chitin high polymer suspension solution for deacetylation, stir at 138°C for 1.5 hours, and generate carapace containing amino groups Chitin high polymer (concentration is 20-25%), control the degree of deacylation in the chitin high polymer molecule to more than 95%.

[0044] 1.2. Degradation of chitin polymer

[0045] Lower the tempe...

Embodiment 2

[0051] 2. Preparation of modified natural chitin bio-based high-performance polycarboxylate superplasticizer

[0052] 2.1. Preparation of aminochitin polymer

[0053] The chitin high polymer (weight average molecular weight: 335,400) of Nantong Langshan Xingcheng Biochemical Products Factory was used as a raw material. Weigh 330kg of chitin polymer and 670kg of water into a reaction vessel equipped with a stirrer, a thermometer, a dropping funnel, and a reflux condenser. Raise the temperature to 80°C and stir to form a uniform suspension solution. Raise the temperature to 138°C, add 1185kg of sodium hydroxide solution (50% by weight) to the chitin high polymer suspension solution for deacetylation treatment, stir at 135°C for 2 hours, and generate carapace containing amino groups Chitin high polymer (concentration is 20-25%), control the degree of deacylation in the chitin high polymer molecule to more than 95%.

[0054] 2.2. Degradation of chitin polymer

[0055] Lower th...

Embodiment 3

[0061] 3. Preparation of modified natural chitin bio-based high-performance polycarboxylate superplasticizer

[0062] 3.1. Preparation of aminochitin polymer

[0063] The chitin high polymer (weight average molecular weight: 335,400) of Nantong Langshan Xingcheng Biochemical Products Factory was used as a raw material. Weigh 350kg of chitin polymer and 660kg of water into a reaction vessel equipped with a stirrer, a thermometer, a dropping funnel, and a reflux condenser. Raise the temperature to 80°C and stir to form a uniform suspension solution. Raise the temperature to 1140°C, add 1200kg of sodium hydroxide solution (50% by weight) to the chitin high polymer suspension solution for deacetylation treatment, stir at 140°C for 1 hour, and generate carapace containing amino groups Chitin high polymer (concentration is 20-25%), control the degree of deacylation in the chitin high polymer molecule to more than 95%.

[0064] 3.2. Degradation of chitin polymer

[0065]Lower the...

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Abstract

The invention relates to a preparation method of a modified natural chitin bio-based high-performance polycarboxylate superplasticizer. A chitin high polymer is used as a raw material for preparing the polycarboxylate superplasticizer. The chitin high polymer is subjected to deacylation and degradation treatment to obtain a modified chitin oligomer connected with a hydrophilic methylol group and an amino group; maleic anhydride containing a double bond is introduced onto the amino group of the modified chitin oligomer by a grafting reaction; N-maleic anhydride-oligomeric chitin graft and sodium methacrylate sulfonate are subjected to copolymerization to prepare a novel high-performance polycarboxylate superplasticizer containing -SO3H, -COOH, -OH, -CH2OH groups. The prepared polycarboxylate superplasticizer has a good dispersion effect on cement particles at a lower dosage, has a certain comb structure, can be adsorbed on the surface of the cement particles, and can generate a steric-hinerance effect. Then, concrete doped with the polycarboxylate superplasticizer has excellent fluidity retention property.

Description

technical field [0001] The invention relates to the field of high-performance concrete materials, in particular to a preparation method of a modified natural chitin bio-based high-performance polycarboxylate water reducer. Background technique [0002] As high-performance concrete is widely used in civil engineering such as civil buildings, highways, bridges, tunnels, docks, and drilling platforms, the use of concrete materials continues to increase, and concrete materials have become the most used building materials in the 21st century. High-performance water reducer is an indispensable component for the preparation of high-performance concrete materials. Adding high-performance water reducer to concrete materials can effectively improve the fluidity of concrete, reduce the amount of mixing water and reduce the water-cement ratio of concrete materials. At the same time, the use of high-efficiency water reducer can also solve the problems of large slump loss rate of concrete...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F228/02C08B37/08C04B24/16C04B103/30
CPCC04B24/168C04B2103/302C08B37/003C08F251/00C08F228/02
Inventor 赵晖宣卫红陈达廖迎娣欧阳峰杜杨徐海生
Owner JINLING INST OF TECH
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