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CN-121556042-B - Ionic liquid corrosion inhibitor and preparation method and application thereof

CN121556042BCN 121556042 BCN121556042 BCN 121556042BCN-121556042-B

Abstract

The invention relates to an ionic liquid corrosion inhibitor, a preparation method and application thereof, wherein the ionic liquid corrosion inhibitor consists of N, N-dialkyl secondary ammonium cations and dodecyl benzene sulfonic acid anions and has a general structure shown in the following figure. The ionic liquid corrosion inhibitor is added into mineral oil as an oil-soluble corrosion inhibitor, so that corrosion of steel materials in a hot and humid atmosphere environment can be prevented. The ionic liquid corrosion inhibitor has the characteristics of good oil solubility, stable micelle structure and high corrosion inhibition efficiency, and can be used as a key rust inhibition component in novel rust preventive oil. The oil-soluble surface active ionic liquid corrosion inhibitor based on N, N-dialkyl-secondary ammonium ions and dodecyl benzene sulfonate ions provided by the invention has the characteristics of being green, nontoxic, good in oil solubility and high in corrosion inhibition efficiency.

Inventors

  • SONG WENSU
  • ZHU KAI
  • MA XIAOZE
  • ZHANG JIANYONG
  • ZHANG YI

Assignees

  • 武汉科思特仪器股份有限公司

Dates

Publication Date
20260508
Application Date
20260122

Claims (9)

  1. 1. The ionic liquid corrosion inhibitor is characterized in that the ionic liquid corrosion inhibitor is an oil-soluble corrosion inhibitor, and comprises N, N-dialkyl secondary ammonium dodecyl benzene sulfonic acid ionic liquid, and the structural general formula of the ionic liquid corrosion inhibitor is shown as I: I; wherein m and n in the structural formula I are 3-17.
  2. 2. The method for preparing the ionic liquid corrosion inhibitor according to claim 1, comprising the following steps: s1, mixing long-chain alkyl primary amine and alkyl halide to obtain a double-long-chain secondary amine halogen acid salt solution, wherein the carbon content of the long-chain alkyl primary amine is 4-18, and the alkyl halide is n-bromobutane; s2, mixing the double long-chain secondary amine halogen acid salt solution, sodium dodecyl benzene sulfonate, water and dichloromethane, and purifying to obtain the ionic liquid corrosion inhibitor.
  3. 3. The method of claim 2, wherein the molar ratio of long chain alkyl primary amine, alkyl halide, and sodium dodecyl benzene sulfonate is 1:1:1.
  4. 4. The production method according to claim 2, wherein in step S1, a long-chain alkyl primary amine, an alkyl halide and a solvent are mixed to obtain a double-long-chain secondary amine hydrohalogenate solution, wherein the solvent includes at least one of tetrahydrofuran, acetonitrile and dimethylformamide.
  5. 5. The process of claim 4, wherein 4mL of solvent is added per 5mmol of long chain alkyl primary amine.
  6. 6. The preparation method according to claim 2, wherein in step S1, the temperature of the mixed reaction of the long-chain alkyl primary amine and the haloalkane is 60 to 80 ℃ and the reaction time is 4 to 5 hours.
  7. 7. The method according to claim 4, wherein in step S2, the water is used in an amount of one fourth of the volume of the solvent.
  8. 8. The process according to claim 4, wherein in step S2, 10mL of methylene chloride is added per 5mmol of sodium dodecylbenzenesulfonate.
  9. 9. An anti-rust oil, comprising the ionic liquid corrosion inhibitor according to claim 1 or prepared by the preparation method according to any one of claims 2 to 8.

Description

Ionic liquid corrosion inhibitor and preparation method and application thereof Technical Field The invention belongs to the technical field of metal corrosion inhibition, and particularly relates to an ionic liquid corrosion inhibitor, a preparation method and application thereof. Background Under the action of complex atmospheric environment, the storage and transportation equipment is extremely easy to adsorb hygroscopic salt particles (such as NaCl, mgCl 2 and the like), and even under the condition of low humidity (< 40%), the micron-sized corrosion liquid film can be formed through capillary adsorption and condensation. In addition, as the instrument and equipment become more integrated and miniaturized, the failure such as instrument functional failure can be possibly caused by the corrosion weight loss of ng level only. Traditional rust preventive oil systems rely on physical barriers to separate corrosive media, but under the coupling action of multiple factors such as damp heat, salt particle deposition, polluted gas invasion and the like, oil films are extremely easy to decline in protection efficiency. The oil-soluble corrosion inhibitor is used as a core component of the rust preventive oil, and the microstructure of the oil-soluble corrosion inhibitor is closely related to the macroscopic property of the rust preventive oil. The Surface Active Ionic Liquid (SAILs) is widely used in the research of water phase corrosion inhibitors in recent years due to the controllability and high corrosion inhibition of the structure, but the amphiphilicity of SAILs also provides potential possibility for the application of the surface active ionic liquid in an oil phase, which has important significance for developing high-performance rust preventive oil. Disclosure of Invention In view of the above, the invention provides an ionic liquid corrosion inhibitor, a preparation method and application thereof, and has the characteristics of green and non-toxicity, good oil solubility and high corrosion inhibition efficiency. In order to achieve the above purpose, the invention adopts the following technical scheme: In a first aspect, the invention provides an ionic liquid corrosion inhibitor, which comprises N, N-dialkyl secondary ammonium dodecyl benzene sulfonic acid ionic liquid, wherein the structural general formula of the ionic liquid is shown as I: I wherein m and n in the structural formula I are 3-17. In a second aspect, the invention provides a preparation method of the ionic liquid corrosion inhibitor, which comprises the following steps: s1, mixing long-chain alkyl primary amine and alkyl halide to obtain a double-long-chain secondary amine halogen acid salt solution, wherein the carbon content of the long-chain alkyl primary amine is 4-18, and the alkyl halide is n-bromobutane; s2, mixing the double long-chain secondary amine halogen acid salt solution, sodium dodecyl benzene sulfonate, water and dichloromethane, and purifying to obtain the ionic liquid corrosion inhibitor. Preferably, the molar ratio of the long chain alkyl primary amine, the alkyl halide and the sodium dodecyl benzene sulfonate is 1:1:1. Preferably, in step S1, a long chain alkyl primary amine, an alkyl halide and a solvent are mixed to obtain a double long chain secondary amine hydrohalate solution, wherein the solvent comprises at least one of tetrahydrofuran, acetonitrile and dimethylformamide. Preferably, 4mL of solvent is added per 5mmol of long chain primary alkyl amine. Preferably, in step S1, the temperature of the mixed reaction of the long-chain alkyl primary amine and the haloalkane is 60-80 ℃ and the reaction time is 4-5 hours. Preferably, in step S2, the amount of water is one fourth of the volume of the solvent. Preferably, in step S2, methylene chloride is added in an amount of 10mL of methylene chloride per 5mmol of sodium dodecylbenzenesulfonate. In a third aspect, the invention provides an anti-rust oil, which comprises the ionic liquid corrosion inhibitor or the ionic liquid corrosion inhibitor prepared by the preparation method. Compared with the prior art, the invention has the beneficial effects that: (1) The oil-soluble surface active ionic liquid corrosion inhibitor based on N, N-dialkyl-secondary ammonium ions and dodecyl benzene sulfonate ions provided by the invention has the characteristics of being green, nontoxic, good in oil solubility and high in corrosion inhibition efficiency. (2) The synthesis method provided by the invention has the advantages of simple steps, mild reaction conditions, convenient operation, simple equipment, readily available raw materials and no environmental pollutants. Drawings FIG. 1 is an infrared spectrum of the ionic liquid corrosion inhibitor provided in examples 1-5 of the present invention; FIG. 2 is a graph showing the contact angle of an anti-rust oil film prepared by the ionic liquid corrosion inhibitors provided in examples 1-5 of the present invention on the surface