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Method for preparing amphoteric chitosan water reducing agents

A technology of chitosan and water reducing agent, which is applied in the field of concrete water reducing agent, can solve problems such as covering problems, limited degree of problem solving, unevenness, etc., and achieves improved strength and durability, good slump retention, good The effect of flow properties

Inactive Publication Date: 2012-05-09
天津市鑫永强混凝土外加剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Of course, compounding technology is also one of the ways to solve the problem, but the degree of relying on compounding to solve problems is limited. Compounding is at the expense of a certain aspect of performance. At the same time, compounding will also cover up the root of the problem and hinder the development of technology.
In addition, the solution of the water-reducing agent compounded with retarder will show inhomogeneity, and sedimentation and stratification will appear after standing, which will cause great differences in the performance of cement concrete.

Method used

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  • Method for preparing amphoteric chitosan water reducing agents

Examples

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Effect test

Embodiment 1

[0014] 1) Preparation of monomethoxy polyethylene glycol aldehyde derivatives

[0015] Dissolve 25 parts of polyethylene glycol monomethyl ether MPEG2000 in a mixed solution of 50 parts of dimethyl sulfoxide and 10 parts of chloroform in parts by mass, then add 10.2 parts of acetic anhydride, stir and react at 5°C for 12h, and the reaction The product was poured into 100 parts of ether for crystallization, filtered, and vacuum-dried at 40°C to obtain the monomethoxy polyethylene glycol aldehyde derivative, namely MPEGCHO2000;

[0016] 2) Preparation of N-monomethoxy polyethylene glycol chitosan (MPEGC2000)

[0017] Dissolve 1 part of soluble chitosan in 20 parts of methanol and 40 parts of mass concentration in a mixed solvent composed of 2% acetic acid aqueous solution in parts by mass, then add 2.27 parts of MPEGCHO2000, and then adjust it with 1mol / L sodium hydroxide The pH was 6.5, and then 11 parts containing 0.476 parts of sodium cyanoborohydride (NaCNBH 3 ) solution, ...

Embodiment 2

[0021] 1) Preparation of monomethoxy polyethylene glycol aldehyde derivatives

[0022] Dissolve 25 parts of polyethylene glycol monomethyl ether MPEG2000 in a mixed solution of 50 parts of dimethyl sulfoxide and 10 parts of chloroform in parts by mass, then add 12.66 parts of acetic anhydride, stir and react at 10°C for 11 hours, and the reaction The product was poured into 100 parts of ether for crystallization, filtered, and vacuum-dried at 40°C to obtain the monomethoxy polyethylene glycol aldehyde derivative, namely MPEGCHO2000;

[0023] 2) Preparation of N-monomethoxy polyethylene glycol chitosan (MPEGC2000)

[0024] Dissolve 1 part of soluble chitosan in 20 parts of methanol and 40 parts of mass concentration in a mixed solvent composed of 2% acetic acid aqueous solution in parts by mass, then add 3.33 parts of MPEGCHO2000, and adjust with 1mol / L sodium hydroxide The pH was 6.5, and then 12 parts containing 0.68 parts of sodium cyanoborohydride (NaCNBH 3 ) aqueous solu...

Embodiment 3

[0028] 1) Preparation of monomethoxy polyethylene glycol aldehyde derivatives

[0029] Dissolve 25 parts of polyethylene glycol monomethyl ether MPEG2000 in a mixed solution of 50 parts of dimethyl sulfoxide and 10 parts of chloroform in parts by mass, then add 14.12 parts of acetic anhydride, stir and react at 15°C for 10 h, and the reaction The product was poured into 100 parts of ether for crystallization, filtered, and vacuum-dried at 40°C to obtain the monomethoxy polyethylene glycol aldehyde derivative, namely MPEGCHO2000;

[0030] 2) Preparation of N-monomethoxy polyethylene glycol chitosan (MPEGC2000)

[0031] Dissolve 1 part of soluble chitosan in 20 parts of methanol and 40 parts of mass concentration in a mixed solvent composed of 2% acetic acid aqueous solution in parts by mass, then add 3.45 parts of MPEGCHO2000, and then adjust it with 1mol / L sodium hydroxide The pH was 6.5, and then 13 parts containing 0.79 parts of sodium cyanoborohydride (NaCNBH 3 ) solution...

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Abstract

The invention relates to a method for preparing amphoteric chitosan water reducing agents. The amphoteric chitosan water reducing agents are prepared from chitosan, methoxy polyethylene glycol, acetic anhydride and chlorosulfonic acid through reaction. The method has the innovation point that the natural chitosan is used as raw materials, methoxy polyethylene glycol (MPEG) and hydrophilic sulfo groups are introduced, and the novel amphoteric chitosan water reducing agents are prepared. The prepared amphoteric chitosan water reducing agents have the advantages that the product performance is stable, the cement adaptability is high, the compatibility is good, the cement initial net pulp flowability can reach a value higher than 250mm (W / C=0.29), the concrete water reducing rate can reach about 25 percent, the one-hour collapsbillity can reach 140mm, and in addition, no pollution is caused on the environment. The preparation method has the advantages that the preparation process is noveland unique, the industrial production is convenient, and the like.

Description

technical field [0001] The invention belongs to the technical field of concrete water reducers, and relates to a preparation method of an amphoteric chitosan water reducer used in concrete construction. Background technique [0002] Water reducing agent can improve many properties of freshly mixed and hardened concrete, so it is recognized as the most important chemical admixture of concrete. The development of water reducers has gone through the first generation of water reducers represented by wood calcium, wood sodium, etc., the second generation of water reducers represented by Nai series and melamine, and now it has developed to polycarboxylic acid and its ester polymerization. The third generation of water reducer represented by water reducing agent. In China, the first generation of water reducing agents has been basically eliminated, the second generation of water reducing agents is the most widely used, and the third generation of water reducing agents is still bei...

Claims

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Application Information

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IPC IPC(8): C08G81/00C08G65/48C08B37/08C04B24/16C04B103/30
Inventor 吕生华段建平
Owner 天津市鑫永强混凝土外加剂有限公司
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