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Polysaccharide derivative and its preparation method and application

A technology of derivatives and polysaccharides, used in anti-corrosion materials and application fields, can solve the problems of corrosion inhibition efficiency and high toxicity in polluted environments, achieve high efficiency, low dosage, low toxicity, and improve leveling

Active Publication Date: 2022-08-05
湖南鑫恒环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although most inorganic or organic corrosion inhibitors have good applicability, they have more or less problems such as high toxicity, environmental pollution and low corrosion inhibition efficiency.

Method used

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  • Polysaccharide derivative and its preparation method and application
  • Polysaccharide derivative and its preparation method and application
  • Polysaccharide derivative and its preparation method and application

Examples

Experimental program
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Effect test

preparation example Construction

[0081] Another aspect of the present invention provides a method for preparing any of the above-mentioned polysaccharide derivatives, comprising the following steps S100-S200.

[0082] In step S100, compound 1 is subjected to an oxidation reaction with an oxidant to obtain intermediate M.

[0083] In some of the embodiments, the above oxidation reaction is carried out under the condition of a protective gas atmosphere and a pH value of 7.0; further, the condition of the oxidation reaction is: the reaction is carried out at 60°C to 120°C for 12h to 36h.

[0084] In some of the embodiments, the molar ratio of compound 1 and oxidizing agent in step S100 is 1: (1.5-3.5).

[0085] In some of these embodiments, the above-mentioned oxidizing agent is selected from halogen acid salts; further, the above-mentioned oxidizing agent is selected from sodium iodate.

[0086] In some of these embodiments, in step S100, after the oxidation reaction step, the step of purifying the oxidation r...

Embodiment 1

[0114] The synthetic route of the glycan derivatives is shown below:

[0115]

[0116] The specific synthesis process is as follows:

[0117] 1) Weigh 5g glucomannan (C 24 H 42 O 21 , molecular weight 60000-80000g / mol) GA is added in the round bottom flask of 100mL, add by 10gNaIO 4 , and use NH 3 .H 2 O solution adjusted the pH of the reaction system to 7.0, and then reacted at 60 °C for 24 h. After the reaction, centrifuge at 2000 rpm, filter, wash with deionized water and absolute ethanol for more than 3 times in turn, and dry at 40 °C for 12 h after the end to obtain the pretreated GA product.

[0118] 2) 40 mg of the pretreated GA-1 product obtained in step 1) and 100 mg of 4-aminothiazole were added to a 40 mL dimethyl sulfoxide (DMSO) round-bottomed flask, while using NH3.H 2 The pH value of the reaction system was adjusted to 7.0 with the O solution. Under the protection of nitrogen, the reaction was magnetically stirred at 80 °C for 12 h. After the reaction,...

Embodiment 2

[0121] The anti-corrosion performance test was carried out on the target product GA-2 of Example 1, as follows.

[0122] The raw material glucomannan GA, the intermediate product GA-1 and the target product GA-2 were respectively used as corrosion inhibitors, and the hydrochloric acid cleaning solution containing the raw material GL, the intermediate product GA-1 and the target product GA-2 was prepared accordingly, Among them, the concentration of hydrochloric acid in the hydrochloric acid cleaning solution is 0.5M, and the potentiodynamic polarization curves (25°C) of low carbon steel in the hydrochloric acid cleaning solution containing different corrosion inhibitors are tested, and the results are as follows.

[0123] 1) figure 2 It is the AC impedance spectrum of raw material glucomannan GA, intermediate product GA-1 and target product GA-2 to low carbon steel. The abscissa is the real part of the impedance spectrum (Ωcm 2 ), the ordinate is the imaginary part of the i...

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Abstract

The present invention relates to a polysaccharide derivative, a preparation method and application thereof, wherein the polysaccharide derivative has the structure shown in the following formula (I): the polysaccharide derivative is connected with a five-membered ring containing N or S and a carbon Nitrogen double bond, the polysaccharide derivative can effectively prevent the metal surface from being corroded to produce flash rust, so as to protect the metal from corrosion and hydrogen embrittlement. As a corrosion inhibitor, it has high corrosion inhibition efficiency, low toxicity, and is biodegradable. It can also increase the surface wetting effect of the coating, improve the leveling ability of the coating, and ultimately improve the leveling, appearance, adhesion and service life of the coating.

Description

technical field [0001] The invention relates to new chemical materials, especially anti-corrosion materials and the technical field of application, in particular to a polysaccharide derivative and a preparation method and application thereof. Background technique [0002] With the depletion of global freshwater resources, using seawater as water for industrial cooling systems has become a beneficial option to alleviate the shortage of freshwater resources. However, natural seawater contains a large amount of corrosive substances, such as chloride ions (Cl - ), sulfate ion (SO 4 2- ), carbonate ions (CO 3 2- ), organic acids and corrosive microorganisms, etc., which can easily cause corrosion and leakage in the cooling system, which will not only lead to a significant reduction in the heat exchange efficiency in the cooling system, but also lead to rapid deterioration of equipment materials, resulting in serious economic losses and safety. question. In the field of indu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/02C23F11/173C09D175/04C09D5/08C09K8/54
CPCC08B37/0009C23F11/173C09D175/04C09D5/08C09K8/54C09K2208/32C08L5/02
Inventor 钟仁华刘娅莉罗小虎彭诗阳陈博潘心宇
Owner 湖南鑫恒环境科技有限公司
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