Syntheses and application of water-soluble bis-Schiff base potassium salts

A Schiff base potassium salt, water-soluble technology, applied in the field of Schiff base corrosion inhibitors and synthesis, can solve the problems of inability to achieve high concentration, low solubility, low slow release effect, etc. The effect of good performance, simple synthesis and separation methods

Inactive Publication Date: 2017-01-04
CHONGQING UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0002] Existing Schiff base corrosion inhibitors and other types of corrosion inhibitors have a certain corrosion inhibition effect on copper in 3.5% sodium chloride solution by mass ratio, but the slow release effect is low, mainly organic corrosion inhibitors The solubility of the agent in the sodium chloride solution is extremely low, and the slow-release solution of high concentration cannot form multi-layer adsorption on the copper surface.

Method used

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  • Syntheses and application of water-soluble bis-Schiff base potassium salts
  • Syntheses and application of water-soluble bis-Schiff base potassium salts
  • Syntheses and application of water-soluble bis-Schiff base potassium salts

Examples

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Effect test

Embodiment 1

[0017] 2,2'-(1E,1'E)-(4,4'-((E)-ethylene-1,2-diyl)bis(4,1-phenylene))bis(azane-1 Synthesis of Potassium -yl-1-ylidene)di(methane-1-yl-1-ylidene)diphenylalkoxide

[0018] 2,2'-(1E,1'E)-(4,4'-((E)-ethylene-1,2-diyl)bis(4,1-phenylene))bis(azane-1 -yl-1-ylidene) bis(methane-1-yl-1-ylidene)diphenol (1.00g, 2.4mmol), potassium hydroxide (0.29g, 5.3mmol) were added to a 50mL single-necked flask, and 10mL of anhydrous Ethanol, stirred magnetically at normal temperature for 2 hours, the reaction was completed, and the solvent was removed by distillation under reduced pressure, then extracted with methylene chloride, and distilled under reduced pressure to obtain a yellow solid compound, and its hydrogen nuclear magnetic resonance spectrum was as follows: figure 1 , yield 65%. 1 H-NMR (400MHz, DMSO-d 6 )δ (ppm): 10.118 (s, 2H, -OH), 7.616-7.523 (m, 7H, Ar-H), 7.244-7.113 (m, 10H, Ar-H), 6.908-6.894 (d, J= 5.6Hz, 3H, Ar-H), 6.849-6.824 (t, 2H, J=5Hz, Ar-CH=CH).

Embodiment 2

[0020] 3,3'-(1E,1'E)-(4,4'-((E)-ethylene-1,2-diyl)bis(4,1-phenylene))bis(azane-1 Synthesis of Potassium -yl-1-ylidene)di(methane-1-yl-1-ylidene)diphenylalkoxide

[0021] 3,3'-(1E,1'E)-(4,4'-((E)-ethylene-1,2-diyl)bis(4,1-phenylene))bis(azane-1 -yl-1-ylidene) bis(methane-1-yl-1-ylidene)diphenol (1.00g, 2.4mmol), potassium hydroxide (0.29g, 5.3mmol) were added to a 50mL single-necked flask, and 10mL of anhydrous Ethanol, magnetic stirring at normal temperature for 2 hours, the reaction was completed, the solvent was removed by distillation under reduced pressure, then extracted with dichloromethane, and distilled under reduced pressure to obtain a yellow solid compound, and its H NMR spectrum was as follows: figure 2 , yield 67%. 1 H-NMR (400MHz, DMSO-d 6 )δ (ppm): 10.028 (s, 2H, -OH), 7.616-7.523 (m, 7H, Ar-H), 7.244-7.113 (m, 10H, Ar-H), 6.908-6.894 (d, J= 5.6Hz, 3H, Ar-H), 6.849-6.824 (t, 2H, J=5Hz, Ar-CH=CH).

Embodiment 3

[0023] 4,4'-(1E,1'E)-(4,4'-((E)-ethylene-1,2-diyl)bis(4,1-phenylene))bis(azane-1 Synthesis of Potassium -yl-1-ylidene)di(methane-1-yl-1-ylidene)diphenylalkoxide

[0024] 4,4'-(1E,1'E)-(4,4'-((E)-ethylene-1,2-diyl)bis(4,1-phenylene))bis(azane-1 -yl-1-ylidene) bis(methane-1-yl-1-ylidene)diphenol (1.00g, 2.4mmol), potassium hydroxide (0.29g, 5.3mmol) were added to a 50mL single-necked flask, and 10mL of anhydrous Ethanol, stirred magnetically at normal temperature for 2 hours, the reaction was completed, and the solvent was removed by distillation under reduced pressure, then extracted with methylene chloride, and distilled under reduced pressure to obtain a yellow solid compound, and its hydrogen nuclear magnetic resonance spectrum was as follows: image 3 , yield 68%. 1 H-NMR (400MHz, DMSO-d 6 )δ (ppm): 10.008 (s, 2H, -OH), 7.616-7.523 (m, 7H, Ar-H), 7.244-7.113 (m, 10H, Ar-H), 6.908-6.894 (d, J= 5.6Hz, 3H, Ar-H), 6.849-6.824 (t, 2H, J=5Hz, Ar-CH=CH).

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Abstract

As a corrosion inhibitor of copper, a type of water-soluble bis-Schiff base potassium salts have a chemical structural formula described in the description, wherein in the structural formula, C1, R1=-OK, R2=R3=H; C2, R2=-OK, R1=R3=H; C3, R3=-OK, R1=R2=H. As the corrosion inhibitor, the type of water-soluble bis-Schiff base potassium salts have a corrosion inhibition effect for the metal copper in a sodium chloride solution with a mass ratio of 3.5%; due to the chemical structure of the organic salt, the water solubility of the corrosion inhibitor is greatly improved, and the corrosion inhibition effect of the corrosion inhibitor is further facilitated to be improved; furthermore, a synthesis method and a separation method of the water-soluble bis-Schiff base potassium salts are simple, and raw materials are conveniently obtained.

Description

technical field [0001] The invention belongs to the technical field of Schiff base corrosion inhibitors and their synthesis, and in particular relates to the synthesis of water-soluble di-Schiff base potassium salt and its application to corrosion inhibition of copper in a sodium chloride solution with a mass ratio of 3.5%. Background technique [0002] Existing Schiff base corrosion inhibitors and other types of corrosion inhibitors have a certain corrosion inhibition effect on copper in 3.5% sodium chloride solution by mass ratio, but the slow release effect is low, mainly organic corrosion inhibitors The solubility of the agent in the sodium chloride solution is extremely low, and the slow-release solution of high concentration cannot reach the formation of multi-layer adsorption on the copper surface. Contents of the invention [0003] The purpose of the present invention is exactly in order to overcome the deficiency of above-mentioned background technology, synthesiz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C249/02C07C251/24C23F11/14
CPCC23F11/146C07C249/02C07C251/24
Inventor 苏纪宏王震强丁戈高放李红茹张胜涛罗自萍
Owner CHONGQING UNIV
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