Disubstituted thiadiazole compound, preparation method and application thereof

Abstract

The invention relates to a seawater corrosion inhibitor for copper, in particular to a disubstituted thiadiazole compound, a preparation method and application thereof. The disubstituted thiadiazole compound is (5-m-tolyl-[1,3,4]thiadiazole-2-sulfydryl)aceto-(4-dimethylamino benzyl)-hydrazide, and a structural formula is shown in the specification. The disubstituted thiadiazole compound can be used as the seawater corrosion inhibitor for copper products. The seawater corrosion inhibitor is less in using amount, small in toxicity, high in efficiency and high in capacity of lasting action, can inhibit the corrosion and damage of metal copper effectively and has a wide application prospect.

Description

technical field

[0001] The invention relates to a seawater corrosion inhibitor for copper, in particular to a disubstituted thiadiazole compound and a preparation method and application thereof. 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 copper ran...

Examples

Embodiment 1

[0022] The disubstituted thiadiazole compound is (5-m-toluene-[1,3,4]thiadiazole-2-mercapto)acetic acid (4-dimethylaminobenzyl)-hydrazide, and its structural formula is:

[0023]

[0024] Preparation:

[0025] The chemical reaction equation is:

[0026]

[0027] Firstly, m-toluic acid and methanol were mixed equimolarly, and reaction dehydration was carried out to obtain methyl m-toluate (I); the product (I) was reacted with excess hydrazine hydrate, and refluxed at 80°C for 5 hours to obtain acetylhydrazide (II); The obtained reaction product (II) and a slight excess of carbon disulfide were heated to reflux at 75°C in NaOH or KOH alkaline environment, and reacted for 4 hours to form compound (III); the product (III) was catalyzed by concentrated sulfuric acid, and the oil bath temperature was 75 Carry out cyclization at ℃ for 2h to obtain (IV); under NaOH / KOH alkaline conditions (IV) react with excess ethyl chloroacetate plus reflux at 70°C for 5h to obtain (V); react...

Embodiment 2

[0037] Conditions: The experimental material is red copper (99.999%), the corrosion inhibitor is dissolved in cyclohexanone, and its weight ratio to cyclohexanone is 1:10, and then the mixed solution is ultrasonically dispersed with an ultrasonic disperser at room temperature 20min minute, make it dissolve completely; Then, the solution after fully dissolving is joined in the OP-10 emulsifier (Tianjin Damao Chemical Instrument Supply Station, trade name emulsifier OP-10), the OP-10 emulsifier The weight ratio of the added amount to cyclohexanone is 1:1, and the corrosion inhibitor is obtained by stirring evenly at room temperature, and then the copper (99.999%) is immersed in the corrosion inhibitor with pH=7.5 at 25°C, soaking time The time is 30 minutes.

[0038] The disubstituted thiadiazole compound is mixed with 0.5L, 3.5% sodium chloride solution, and the effective content of the disubstituted thiadiazole compound in the corrosion inhibitor is 0.0050g.

[0039] The corr...

Embodiment 3

[0041]Conditions: The experimental material is red copper (99.999%), the corrosion inhibitor is dissolved in cyclohexanone, and its weight ratio to cyclohexanone is 1:10, and then the mixed solution is ultrasonically dispersed with an ultrasonic disperser at room temperature 20min minute, make it dissolve completely; Then, the solution after fully dissolving is joined in the OP-10 emulsifier (Tianjin Damao Chemical Instrument Supply Station, trade name emulsifier OP-10), the OP-10 emulsifier The weight ratio of the added amount to cyclohexanone is 1:1, and the corrosion inhibitor is obtained by stirring evenly at room temperature, and then the copper (99.999%) is immersed in the corrosion inhibitor with pH=7.5 at 25°C, soaking time The time is 30 minutes.

[0042] The disubstituted thiadiazole compound is mixed with 0.5L, 3.5% sodium chloride solution, and the effective content of the disubstituted thiadiazole compound in the corrosion inhibitor is 0.0100g.

[0043] The corro...

technical field

[0001] The invention relates to a seawater corrosion inhibitor for copper, in particular to a disubstituted thiadiazole compound and a preparation method and application thereof. 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 copper ran...

Examples

Embodiment 1

[0022] The disubstituted thiadiazole compound is (5-m-toluene-[1,3,4]thiadiazole-2-mercapto)acetic acid (4-dimethylaminobenzyl)-hydrazide, and its structural formula is:

[0023]

[0024] Preparation:

[0025] The chemical reaction equation is:

[0026]

[0027] Firstly, m-toluic acid and methanol were mixed equimolarly, and reaction dehydration was carried out to obtain methyl m-toluate (I); the product (I) was reacted with excess hydrazine hydrate, and refluxed at 80°C for 5 hours to obtain acetylhydrazide (II); The obtained reaction product (II) and a slight excess of carbon disulfide were heated to reflux at 75°C in NaOH or KOH alkaline environment, and reacted for 4 hours to form compound (III); the product (III) was catalyzed by concentrated sulfuric acid, and the oil bath temperature was 75 Carry out cyclization at ℃ for 2h to obtain (IV); under NaOH / KOH alkaline conditions (IV) react with excess ethyl chloroacetate plus reflux at 70°C for 5h to obtain (V); react...

Embodiment 2

[0037] Conditions: The experimental material is red copper (99.999%), the corrosion inhibitor is dissolved in cyclohexanone, and its weight ratio to cyclohexanone is 1:10, and then the mixed solution is ultrasonically dispersed with an ultrasonic disperser at room temperature 20min minute, make it dissolve completely; Then, the solution after fully dissolving is joined in the OP-10 emulsifier (Tianjin Damao Chemical Instrument Supply Station, trade name emulsifier OP-10), the OP-10 emulsifier The weight ratio of the added amount to cyclohexanone is 1:1, and the corrosion inhibitor is obtained by stirring evenly at room temperature, and then the copper (99.999%) is immersed in the corrosion inhibitor with pH=7.5 at 25°C, soaking time The time is 30 minutes.

[0038] The disubstituted thiadiazole compound is mixed with 0.5L, 3.5% sodium chloride solution, and the effective content of the disubstituted thiadiazole compound in the corrosion inhibitor is 0.0050g.

[0039] The corr...

Embodiment 3

[0041]Conditions: The experimental material is red copper (99.999%), the corrosion inhibitor is dissolved in cyclohexanone, and its weight ratio to cyclohexanone is 1:10, and then the mixed solution is ultrasonically dispersed with an ultrasonic disperser at room temperature 20min minute, make it dissolve completely; Then, the solution after fully dissolving is joined in the OP-10 emulsifier (Tianjin Damao Chemical Instrument Supply Station, trade name emulsifier OP-10), the OP-10 emulsifier The weight ratio of the added amount to cyclohexanone is 1:1, and the corrosion inhibitor is obtained by stirring evenly at room temperature, and then the copper (99.999%) is immersed in the corrosion inhibitor with pH=7.5 at 25°C, soaking time The time is 30 minutes.

[0042] The disubstituted thiadiazole compound is mixed with 0.5L, 3.5% sodium chloride solution, and the effective content of the disubstituted thiadiazole compound in the corrosion inhibitor is 0.0100g.

[0043] The corro...

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