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Schiff base containing nitrogenous heterocyclic compound and preparation method and application thereof

A technology of nitrogen heterocyclic compounds and Schiff bases, applied in the field of Schiff base-containing nitrogen heterocyclic compounds and their preparation and application, can solve the problems of scarcity of corrosion inhibitors, poor activity, loss of performance, etc., and achieve strong applicability , low cost, and 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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  • Schiff base containing nitrogenous heterocyclic compound and preparation method and application thereof
  • Schiff base containing nitrogenous heterocyclic compound and preparation method and application thereof
  • Schiff base containing nitrogenous heterocyclic compound and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 4-[(4-Hydroxybenzyl)amino]-5-p-toluene-4H-[1,2,4]triazole-3-mercapto Preparation method:

[0025] The chemical reaction equation is:

[0026]

[0027] First, mix benzoic acid and methanol, reflux at 65°C-70°C for 4h, and dehydrate to obtain methyl benzoate (I); react the product (I) with excess hydrazine hydrate, and reflux at 60°C-80°C for 4h-5h to obtain benzoate Hydrazide (II); the resulting reaction product (II) and excess carbon disulfide are refluxed at 70°C to 85°C for 5h-6h under NaOH / KoOH alkaline environment, and then reacted with excess hydrazine hydrate, refluxed at 65°C to 85°C 4h-6h cyclization to give 4-amino-5-phenyl-4H-1,2,4-triazole-3-thiol (III); reaction of product (III) with excess p-hydroxybenzaldehyde, 65 Reflux at ℃~80℃ for 4h-5h, the reaction yields yellow solid 4-[(4-hydroxybenzyl)amino]-5-p-toluene-4H-[1,2,4]tri Azole-3-mercapto (IV).

[0028] The above-mentioned substance is identified by NMR and its NMR spectrum data are as follows:

...

Embodiment 2

[0037] The experimental material is copper (99.999%), and 4-[(4-hydroxybenzyl)amino]-5-p-toluene-4H-[1,2,4]triazole-3-mercapto is used as a corrosion inhibitor. The medium is 3.5% sodium chloride solution, immerse the red copper product in the medium added with corrosion inhibitor, the temperature is 25°C, pH=7.5, soak for 30min, the amount of medium is 0.5L, 4-[(4-hydroxyl in the medium Benzyl)amino]-5-p-toluene-4H-[1,2,4]triazole-3-mercapto was added in an amount of 0.050 g.

[0038] The corrosion inhibition efficiencies obtained through experimental tests are: electrochemical impedance spectroscopy 59.67%, dynamic potential polarization 87.11%, showing that it is a corrosion inhibitor with low dosage and high efficiency.

Embodiment 3

[0040] The experimental material is copper (99.999%), and 4-[(4-hydroxybenzyl)amino]-5-p-toluene-4H-[1,2,4]triazole-3-mercapto is formulated as a corrosion inhibitor , the medium is 3.5% sodium chloride solution, immerse the red copper product in the medium added with corrosion inhibitor, the temperature is 25 ° C, pH = 7.5, soak for 30 minutes, the amount of medium is 0.5L, 4-[(4- The amount of hydroxybenzyl)amino]-5-p-toluene-4H-[1,2,4]triazole-3-mercapto was 0.075 g.

[0041]The corrosion inhibition efficiency obtained through the test is: electrochemical impedance spectroscopy 75.45%, dynamic potential polarization 86.72%, showing 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 of copper, in particular to a Schiff base containing nitrogenous heterocyclic compound and a preparation method and application thereof. The Schiff base containing nitrogenous heterocyclic compound is 4-[(4-hydroxybenzyl)amino]-5-p-methylbenzene-4H-[1,2,4]triazole-3-sulfydryl with structural formula shown in the specification. 4-[(4-hydroxybenzyl)amino]-5-p-methylbenzene-4H-[1,2,4]triazole-3-sulfydryl can serve as a seawater corrosion inhibitor to inhibit corrosion of copper products in seawater or a sodium chloride medium. The corrosion inhibitor can prevent general corrosion and local corrosion of metallic copper in the process of contact with seawater or sodium chloride solution. The compound has not been used as a metal corrosion inhibitor yet at present. The corrosion inhibitor has low dosage and toxicity, high efficiency and strong continuing capacity, can effectively inhibit corrosion damage of metallic copper and has broad application prospect.

Description

technical field [0001] The invention relates to a seawater corrosion inhibitor for copper, in particular to a Schiff base-containing nitrogen 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 resource depletion. However, seawater is a strong electrolyte solution with strong corrosiveness, 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, machinability, 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 copp...

Claims

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Application Information

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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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