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Organosilicon benzimidazole corrosion inhibitor and preparation method thereof

A technology of silicon benzimidazole and benzimidazole, which is applied in the field of silicone benzimidazole corrosion inhibitor and its preparation, can solve the problems of insufficient water solubility, harsh conditions, and low yield

Active Publication Date: 2021-05-14
SHANDONG GUIKE NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its active component is a linear macromolecule with methylphenyl hydrogen-containing polysiloxane as the main chain grafted with a variety of substituent groups that have adsorption activity on the metal inner wall surface of the device. This structure makes each linear macromolecule There are multiple adsorption active sites on the molecule, so it has higher adsorption activity than the alkyl imidazoline or alkyl amide corrosion inhibitors in the prior art, and at the same time, multiple active sites are simultaneously adsorbed on the metal surface " The "pinning" effect greatly improves the stability of the active molecules of the corrosion inhibitor to adsorb and form a film. There are relatively insufficient water solubility, the conditions of the hydrosilylation preparation method are harsh, and the shortcomings of low yield

Method used

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  • Organosilicon benzimidazole corrosion inhibitor and preparation method thereof
  • Organosilicon benzimidazole corrosion inhibitor and preparation method thereof
  • Organosilicon benzimidazole corrosion inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Preparation of 2-(4-(1-methylbenzimidazol-2-yl)phenyl)ethanethiol (BZHS).

[0039] In a three-necked flask equipped with a water separator and a condenser, add 4-(2-bromoethyl)benzoic acid (25.37g, 0.11mol), N-methyl-1,2-phenylenediamine (16.24g, 0.13mol) and 200mL xylene, fed nitrogen, refluxed acylation reaction at 140°C for 12h, the water separator continuously separated water; continued to heat up to 200°C for cyclization reaction, and ended the reaction after 5h. After distilling off low-boiling substances at 100°C under reduced pressure, recrystallize with acetone, and dry in vacuo to obtain 2-(4-bromoethylphenyl)-1-methylbenzimidazole with a yield of 87.24%.

[0040] Weigh 2-(4-bromoethylphenyl)-1-methylbenzimidazole (14.01g, 0.11mol) and sodium hydrosulfide hydrate (14.83g) into a single-necked flask, add 100mL methanol, and The reaction was stirred for 24 hours, and the reaction solution was filtered and rotary evaporated to dryness at 80°C, 100 mL of dichloro...

Embodiment 2

[0042] Preparation of vinyl silicone oil (PVMS).

[0043] Put D into the single-necked flask according to the feeding ratio 4 V 、D 4 , MM and catalyst tetramethylammonium hydroxide (D 4 mass 0.2%), stirred and reacted at 90°C for 9h, then raised the temperature to 150°C and stirred for 1h to decompose the catalyst at high temperature, and the obtained crude product was distilled under reduced pressure at 150°C to remove raw materials that did not participate in the reaction to obtain PVMS.

[0044] PVMS has the following general molecular structure formula:

[0045] The raw material ratio, molecular structure characterization data and number of each PVMS are shown in Table 1.

[0046] Table 1

[0047]

[0048] The number-average molecular weight (Mn) was measured by a Waters 515-2414 gel permeation chromatograph, the mobile phase was chloroform, the flow rate was 1mL / min, the detector temperature was 35°C, the column temperature was 40°C, and the standard sample was ...

Embodiment 3

[0053] Preparation of silicone benzimidazole corrosion inhibitor (PDMS-g-BZQA).

[0054]Weigh PVMS, BZHS, benzoin dimethyl ether (DMPA) dissolved in 400mL tetrahydrofuran, and add to the quartz reaction flask, turn on the 365nm ultraviolet light, react at room temperature for 2h under irradiation, finish the reaction, and distill the crude product under reduced pressure Re-dissolved in chloroform, extracted 3 times with a mixed solvent of methanol and water (V:V=1:1), and obtained a light yellow oily substance obtained by volatilizing the organic phase, which was PDMS-g-BZ.

[0055] Put the PDMS-g-BZ obtained above into a reaction bottle equipped with a condenser tube, add methyl iodide and 50mL toluene to dissolve, raise the temperature to 60°C, and keep it under reflux for 48 hours. After the reaction, remove the solvent and methyl iodide by rotary evaporation. The organosilicon benzimidazole corrosion inhibitor (PDMS-g-BZQA) was obtained.

[0056] The raw material dosage o...

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Abstract

The invention discloses an organosilicon benzimidazole corrosion inhibitor and a preparation method thereof, and the preparation method comprises the following steps: 1) preparing a benzimidazole-containing thiol monomer, namely 2-(4-(1-methylbenzimidazole-2-yl) phenyl)ethanethiol; 2) preparing side vinyl silicone oil; and (3) carrying out sulfydryl-vinyl click reaction on the thiol monomer and vinyl silicone oil to graft a benzimidazole group on the molecular weight of polysiloxane, and then carrying out quaternization to obtain the organic silicon benzimidazole corrosion inhibitor. Compared with the prior art, the preparation method of the organic silicon benzimidazole corrosion inhibitor, provided by the invention, has the advantages of mild conditions, high yield, easiness in control and design of a molecular structure, good water solubility and thermal stability and suitability for various complex environments.

Description

technical field [0001] The invention relates to an organic corrosion inhibitor, in particular to an organosilicon benzimidazole corrosion inhibitor and a preparation method thereof. Background technique [0002] Adsorption film-forming corrosion inhibitors commonly used in oil refineries mainly include pyridine, amide and imidazoline corrosion inhibitors. The common feature of these corrosion inhibitors is that the molecules contain nitrogen atoms, and their corrosion inhibition mainly depends on the nitrogen atoms and Metal adsorption is achieved. However, imidazoline or amide corrosion inhibitors with long alkyl side chains have low hydrolysis temperature, unstable structure at higher temperatures, weak continuous corrosion resistance, and poor adaptability to some devices with complex internal structures, etc. Therefore, in some special occasions, it is prone to failure or aggravated corrosion. Therefore, it is proposed to replace long alkyl side chains with organic sili...

Claims

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Application Information

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IPC IPC(8): C08G77/388C08G77/20C23F11/173
CPCC08G77/388C08G77/20C23F11/173
Inventor 张玉花
Owner SHANDONG GUIKE NEW MATERIAL CO LTD
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