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Triazole heterocyclic compound and preparation and application thereof

A technology of heterocyclic compounds and triazoles, which is applied in the field of triazole heterocyclic compounds and their preparation and application, can solve the problems of scarcity of corrosion inhibitors, poor activity, corrosion damage, etc., and achieve good durability and low cost , the effect of inhibiting damage

Inactive Publication Date: 2012-01-25
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although copper ranks after hydrogen in the metal activity sequence table, and its activity is poor, copper is also extremely susceptible to corrosion damage to varying degrees in systems containing chloride ions, sulfates, nitrates and other corrosive media, thus Lose its original various performances, and even bring huge disasters
[0004] At present, although there have been many reports on seawater corrosion inhibitors for metallic copper, the number of corrosion inhibitors that can be used in actual production is extremely rare, and most of them still use traditional benzotriazole compounds as copper corrosion inhibitors. agent, which brings a series of economic and environmental problems to the production process

Method used

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  • Triazole heterocyclic compound and preparation and application thereof
  • Triazole heterocyclic compound and preparation and application thereof
  • Triazole heterocyclic compound and preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] 4-[(2-Chlorobenzyl)amino]-5-p-toluene-4H-[1,2,4]triazole-3-mercapto Preparation method:

[0026] The chemical reaction equation is:

[0027]

[0028] Firstly, equimolar benzoic acid is mixed with methanol, and refluxed at 65℃~70℃ for 4h. The reaction is dehydrated to obtain methyl benzoate (I); the product (I) is reacted with excess hydrazine hydrate, and it is refluxed at 60℃~80℃ for 4h-5h Benzohydrazide (II); the obtained reaction product (II) and excess carbon disulfide are refluxed at 70℃~85℃ for 5h-6h in NaOH or KoOH alkaline environment, and then the reactant is refluxed at 70℃~85℃ for 5h- 6h, then react the reactant with excess hydrazine hydrate, reflux at 65℃~85℃ for 4h-6h cyclization to obtain 4-amino-5-phenyl-4H-1,2,4-triazole-3-thiol (III); Compound (III) and excess 2-chlorobenzaldehyde are refluxed at 65℃~80℃ for 4h-5h, the reaction is to obtain bright yellow solid 4-[(2-chlorobenzyl) with a melting point of 224~227℃ )Amino]-5-p-toluene-4H-[1,2,4]triazole-3-mer...

Embodiment 2

[0039] Conditions: The experimental material is red copper (99.999%), and 4-[(2-chlorobenzyl)amino]-5-p-toluene-4H-[1,2,4]triazole-3-mercapto is formulated as corrosion inhibitor The medium is 3.5% sodium chloride solution, the copper product is immersed in the medium with corrosion inhibitor, the temperature is 25℃, pH=7.5, soak for 30min, the medium dosage is 0.5L, the medium 4-[(2 -Chlorobenzyl)amino]-5-p-toluene-4H-[1,2,4]triazole-3-mercapto group added in an amount of 0.050g.

[0040] The corrosion inhibition efficiencies obtained through experimental tests are: electrochemical impedance spectroscopy 60.27%, and potential polarization 75.11%, which shows that it is a corrosion inhibitor with low dosage and high efficiency.

Embodiment 3

[0042] Conditions: The experimental material is red copper (99.999%), and 4-[(2-chlorobenzyl)amino]-5-p-toluene-4H-[1,2,4]triazole-3-mercapto is formulated as corrosion inhibitor The medium is 3.5% sodium chloride solution, the copper product is immersed in the medium with corrosion inhibitor, the temperature is 25℃, pH=7.5, soak for 30min, the medium dosage is 0.5L, the medium 4-[(2 -Chlorobenzyl)amino]-5-p-toluene-4H-[1,2,4]triazole-3-mercapto group added in an amount of 0.075g. The corrosion inhibition efficiencies obtained through experimental tests are: electrochemical impedance spectroscopy 67.16%, and potential polarization 78.36%, which shows that it is a corrosion inhibitor with low dosage and high efficiency.

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Abstract

The invention relates to a seawater corrosion inhibitor for copper, in particular to a triazole heterocyclic compound and preparation and application thereof. The triazole heterocyclic compound is 4-[(2-chlorobenzyl)amino]-5-p-methylbenzene-4H-[1,2,4]triazole-3-sulfydryl (named by using software), and the structural formula is shown in the specification. The 4-[(2-chlorobenzyl)amino]-5-p-methylbenzene-4H-[1,2,4]triazole-3-sulfydryl can be used as a seawater corrosion inhibitor to inhibit copper products in seawater or sodium chloride media from being corroded. The corrosion inhibitor can prevent metal copper from being totally and locally corroded when the metal copper is contacted with seawater or solution of sodium chloride. The compound is not used as a metal corrosion inhibitor at present. The corrosion inhibitor is small in using amount, low in toxicity, high in efficiency and strong in sustained action capacity, can effectively inhibit the metal copper from being corroded and damaged, and has broad application prospect.

Description

Technical field [0001] The invention relates to a seawater corrosion inhibitor of copper, in particular to a triazole heterocyclic compound and its preparation and application. Background technique [0002] With the continuous consumption of various resources on land, the development and utilization of marine resources has become an inevitable way to solve the current depletion of resources. However, seawater is a strong electrolyte solution and is highly corrosive, which greatly limits the development and utilization of marine resources. Therefore, only by solving the corrosion problem of metal materials in seawater, can the development and utilization value of marine resources be truly reflected. [0003] Copper has excellent mechanical strength, workability, electrical conductivity, thermal conductivity, weldability and other characteristics, and has been widely used in industry, military and civilian fields for a long time. However, although copper ranks after hydrogen in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D249/14C23F11/16
Inventor 李伟华白雪孟彩云侯保荣
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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