Thiazole compound, its preparation and application

A technology of compounds and thiazoles, applied in the fields of thiazoles and their preparation and application, can solve the problems of scarcity of corrosion inhibitors, corrosion damage, poor activity and the like, and achieve the effects of convenient synthesis, inhibition of damage and low cost

Inactive Publication Date: 2012-11-14
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 compound, its preparation and application
  • Thiazole compound, its preparation and application
  • Thiazole compound, its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0035] The chemical reaction equation is:

[0036]

[0037] First, acetic acid and methanol are mixed equimolarly, and the reaction dehydration is obtained 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), and the reaction product ( II) with excess carbon disulfide in KOH (or NaOH, Ca 2 OH) in an alkaline environment to generate compound (III), 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 -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 prod...

Embodiment 2

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

[0047] The corrosion inhibition efficiencies obtained through experimental tests are: electrochemical impedance spectroscopy 85.11%, dynamic potential polarization 82.03%, 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-hydroxy-3-methoxy-benzylidene )-hydrazide and emulsifier are prepared as corrosion inhibitor of microemulsion, the medium is 3.5% sodium chloride solution, the dosage is 0.5L, and (5-methyl-[1,3,4]thiadiazole-2 The amount of -mercapto)-acetic acid (4-hydroxy-3-methoxy-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 91.39%, and dynamic potential polarization 84.55%, 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, that is, a thiazole compound with low toxicity and high efficiency for inhibiting the corrosion to copper and copper products in seawater or common salt mediums, and its preparation and application. The thiazole compound is represented by (5-methyl-[1, 3, 4]thiadiazole-2-mercapto)-acetate(4-hydroxy-3-methoxy-benzylidene)-hydrazide and the structure formula is shown in the specification. The thiazole compound can be used as the seawater corrosion inhibitor of copper to resist corrosion to copper products in seawater or common salt mediums. According to the invention, the corrosion inhibitor disclosed in the invention has the advantages of low consumption, low toxicity, high efficiency, and strong continuous action ability, can effectively resist the corrosion to copper, and has a wide application prospect.

Description

technical field [0001] The invention relates to a seawater corrosion inhibitor for copper, namely a low-toxicity and high-efficiency thiazole 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 has been widel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D285/125C23F11/14
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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