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Mannich base quaternary ammonium salt compound inhibitor and preparation method thereof

A technology of Mannich base and oil Mannich base, which is applied in the field of compound corrosion inhibitor and its preparation, can solve the problems that the corrosion inhibition efficiency needs to be further improved, the synthesis process of corrosion inhibitor is complicated, and the temperature requirement is high, so as to achieve enhanced Inhibit pitting corrosion ability, excellent corrosion inhibition effect, good water solubility effect

Inactive Publication Date: 2014-07-02
纳尔科工业服务(南京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesis of imidazoline quaternary ammonium hydrochloride corrosion inhibitor using linseed oil as raw material has been reported. Very high, consumes a lot of energy, and the corrosion inhibition efficiency after purification treatment needs to be further improved

Method used

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  • Mannich base quaternary ammonium salt compound inhibitor and preparation method thereof
  • Mannich base quaternary ammonium salt compound inhibitor and preparation method thereof
  • Mannich base quaternary ammonium salt compound inhibitor and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The present invention proposes a preparation method of a composite corrosion inhibitor suitable for strongly acidic corrosive media, which specifically includes the following steps:

[0041] Step 1: Preparation of quaternary ammonium salt of linseed oil Mannich base.

[0042] Slowly heat 12g of diethylenetriamine to 100-150°C in a 250ml four-neck bottle under nitrogen protection, add concentrated sulfuric acid catalyst, slowly add 29ml of linseed oil under magnetic stirring conditions, and react at 100-150°C 3-4 hours, the amount of the catalyst added is 0.1-0.5ml per mole of linseed oil, after the reaction is completed, the temperature is lowered to 50-80°C, and 20-40ml of absolute ethanol is added as a solvent to adjust the pH of the solution to 2 -6 or so, then add 18-25g formaldehyde and 8-12 cyclohexanone, condense and reflux at 50-100°C for 8-12h, finally add about 11g of sodium chloroacetate slowly to the product, and condense under mechanical stirring Reflux fo...

Embodiment 2

[0058] The main difference between this embodiment and embodiment 1 lies in step 2, specifically:

[0059] Mix linseed oil Mannich base quaternary ammonium salt, thiourea, sodium molybdate and isopropanol according to their mass fractions of 55%, 20%, 5% and 20% respectively to obtain a compound corrosion inhibitor .

[0060] The compound corrosion inhibitor obtained is added to the 20% HCl solution according to the specific gravity of 0.1 g of the compound corrosion inhibitor per 100 g of 20% HCl, and the 20% HCl with and without the compound corrosion inhibitor is added Carbon steel test pieces were placed in the solution, soaked at 40°C for 20 minutes, and then electrochemical impedance test was performed. The results are as follows: Figure 4 and Figure 5 And as shown in Table 3, after adding the corrosion inhibitor, the impedance value increases obviously, indicating that the corrosion inhibitor has excellent corrosion inhibition effect.

[0061] table 3

[0062] ...

Embodiment 3

[0064] The main difference between this embodiment and embodiment 1 lies in step 2, specifically:

[0065] Mix linseed oil Mannich base quaternary ammonium salt, thiourea, sodium molybdate and isopropanol according to their mass fractions of 60%, 10%, 5% and 25% respectively to obtain a compound corrosion inhibitor .

[0066] The compound corrosion inhibitor obtained is added to the 20% HCl solution according to the specific gravity of 0.1 g of the compound corrosion inhibitor per 100 g of 20% HCl, and the 20% HCl with and without the compound corrosion inhibitor is added Carbon steel test pieces were placed in the solution, soaked at 60°C for 4 hours, and then tested by scanning electron microscope. The results are as follows: Figure 6 and Figure 7 As shown, when no corrosion inhibitor was added, the surface of carbon steel corroded very seriously; after adding corrosion inhibitor, no corrosion was found on the surface of carbon steel, indicating that the corrosion inhibi...

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Abstract

The invention discloses a Mannich base quaternary ammonium salt compound inhibitor. The compound inhibitor consists of the following components in percentage by mass: 50-65 percent of linseed oil Mannich base quaternary ammonium salt, 10-20 percent of thiourea, 5-10 percent of sodium molybdate and 20-30 percent of isopropanol, totaling 100 percent. The Mannich base quaternary ammonium salt compound inhibitor has the beneficial effects that 1, linseed oil taken as a raw material is green plant oil which is environment-friendly, and a final compound inhibitor has high water solubility; 2, the synthesis process of the linseed oil Mannich base quaternary ammonium salt is simple, and low in energy consumption; 3, the linseed oil Mannich base quaternary ammonium salt has high water solubility; 4, by compounding the linseed oil Mannich base quaternary ammonium salt with sodium molybdate, pitting corrosion resistance of the Mannich base quaternary ammonium salt compound inhibitor can be remarkably improved; 5, the compound inhibitor has an excellent inhibiting effect, and the inhibiting efficiency can be over 95 percent.

Description

technical field [0001] The invention relates to a compound corrosion inhibitor and a preparation method thereof, more specifically, it relates to a Mannich base quaternary ammonium salt compound corrosion inhibitor and a preparation method thereof. Background technique [0002] The method of using a strong acid solution to remove scale and rust on the steel surface is called pickling. The strong acidic medium added in the pickling process can not only remove the scale on the surface of the metal material, but also have a certain damage to the metal substrate. Therefore, it is usually necessary to add a specific pickling corrosion inhibitor during the pickling process. A corrosion inhibitor is a substance that can inhibit the destruction process of metals in corrosive media at very low concentrations. The corrosion inhibitor added in the pickling solution, because its arc-pair electrons can interact with the d orbitals of the metal substrate atoms, and adsorb on the metal su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/16
Inventor 张昭沈悦华陈宇江莉江依义安长胜
Owner 纳尔科工业服务(南京)有限公司