Thiazole heterocyclic compound as well as preparation and application thereof

A compound, thiazole technology, applied in the field of thiazole heterocyclic compounds, can solve the problems of scarcity of corrosion inhibitors, corrosion damage, poor activity, etc., and achieve the effects of convenient synthesis, inhibition of damage, and low cost

Inactive Publication Date: 2013-05-15
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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  • Thiazole heterocyclic compound as well as preparation and application thereof
  • Thiazole heterocyclic compound as well as preparation and application thereof
  • Thiazole heterocyclic compound as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (5-Methyl-[1,3,4]thiadiazole-2-mercapto)-acetic acid (4-N,N dimethylamine-benzylidene)-hydrazide preparation method:

[0035] The chemical reaction equation is:

[0036]

[0037] First, mix acetic acid and methanol equimolarly, and dehydrate to obtain methyl acetate (I). The product (I) is mixed with excess hydrazine hydrate, and reacted in an oil bath at 80°C for 2 hours to obtain acetylhydrazide (II). The reaction product (II) will be obtained. ) with excess carbon disulfide in KOH (or NaOH, Ca 2 OH) in an alkaline environment to generate compound (III), and the product (III) was cyclized under the catalysis of concentrated sulfuric acid at an oil bath temperature of 75°C for 1.5h to obtain the product (IV), namely 2-mercapto-5- Methyl-[1,3,4]thiadiazole, then in NaOH (or KOH, Ca 2 OH) under alkaline conditions, product (IV) reacts with excess ethyl chloroacetate to obtain product (V), reacts product (V) with excess hydrazine hydrate to obtain product (VI), and f...

Embodiment 2

[0046] Conditions: The experimental material is copper (99.999%), (5-methyl-[1,3,4]thiadiazole-2-mercapto)-acetic acid (4-N,N dimethylamine-benzylidene )-hydrazide and emulsifier are prepared into microemulsion, the medium is 3.5% sodium chloride solution, the dosage is 0.5L, and (5-methyl-[1,3,4]thiadiazole-2-mercapto)- The amount of acetic acid (4-N, N dimethylamine-benzylidene)-hydrazide is 0.0050 g, the temperature is 25° C., and the pH is 7.5.

[0047] The corrosion inhibition efficiencies obtained through experimental tests are respectively: electrochemical impedance spectroscopy 98.04%, and dynamic potential polarization 96.95%, showing that it is a corrosion inhibitor with low dosage and high efficiency.

Embodiment 3

[0049] Conditions: The experimental material is copper (99.999%), (5-methyl-[1,3,4]thiadiazole-2-mercapto)-acetic acid (4-N,N dimethylamine-benzylidene )-hydrazide and emulsifier are prepared into microemulsion, the medium is 3.5% sodium chloride solution, the dosage is 0.5L, and (5-methyl-[1,3,4]thiadiazole-2-mercapto)- The amount of acetic acid (4-N,N dimethylamine-benzylidene)-hydrazide is 0.0100 g, the temperature is 25° C., and the pH=7.5.

[0050] The corrosion inhibition efficiencies obtained through experimental tests are: electrochemical impedance spectroscopy 98.76%, and dynamic potential polarization 97.85%, 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, namely, a low-toxic and high-efficiency thiazole heterocyclic compound used for inhibiting corrosion of metal copper and products thereof in seawater or a sodium chloride medium, as well as preparation and application of the low-toxic and high-efficiency thiazole heterocyclic compound. The low-toxic and high-efficiency thiazole heterocyclic compound is (5-methyl-[1,3,4] thiadiazole-2-sulfydryl)-acetic acid (4-N,N-dimethylamine-benzylidene)-hydrazide with the following structural formula, wherein the low-toxic and high-efficiency thiazole heterocyclic compound can be used as the seawater corrosion inhibitor of the copper. In the invention, global corrosion and local corrosion of the metal copper in the process of contactingwith the seawater or the sodium chloride solution by using the low-toxic and high-efficiency thiazole heterocyclic compound as the corrosion inhibitor can be prevented. The compound has not been usedas the metal corrosion inhibitor at present. The corrosion inhibitor provided by the invention has the advantages of less consumption, low toxicity, high efficiency, strong ability in sustained action and broad application prospect; and by using the corrosion inhibitor, the corrosion damage of the metal copper can be effectively inhibited.

Description

technical field [0001] The invention relates to a seawater corrosion inhibitor for copper, namely a low-toxicity and high-efficiency thiazole heterocyclic compound used to inhibit the corrosion of metal copper and its products in seawater or sodium chloride medium, 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 h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D285/125C23F11/16
Inventor 李伟华白雪田惠文曹琨侯保荣
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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