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Chilled water corrosion inhibitor for inhibiting electrochemical corrosion and preparation method thereof

A technology of corrosion inhibitor and frozen water, applied in the field of frozen water corrosion inhibitor for inhibiting electrochemical corrosion and its preparation, can solve the problems of eutrophication of environmental water, unfriendly environment, long time required for protective layer, etc. The effect of stabilizing pH and not easy to deposit

Inactive Publication Date: 2021-12-17
广州市粤新工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the corrosion inhibitors on the market generally contain inorganic phosphorus or organic phosphorus. However, the corrosion inhibitors containing phosphorus substances are not friendly to the environment, and will lead to eutrophication of the environmental water after discharge, which is not conducive to the practice of green environmental protection. Industrial production needs, while the structure of imidazoline corrosion inhibitors is relatively unstable in temperature fluctuations, it takes a long time to attach and form a protective layer, and the corrosion resistance is not good

Method used

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  • Chilled water corrosion inhibitor for inhibiting electrochemical corrosion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0033] A chilled water corrosion inhibitor for inhibiting electrochemical corrosion, its raw material components are shown in Table 1, and its preparation method comprises the following steps:

[0034] Step 1: According to the dosage in Table 1, mix cyanuric chloride, benzotriazole, 2-mercaptobenzothiazole with the solvent, heat up to 95°C and stir for 3 hours after sealing, then cool down to 80°C and keep warm React for 2h to obtain the first mixture;

[0035] Step 2: Stir and cool down the first mixture to 65° C., put in diethoxymethylphenylsilane and stir for 2 hours to obtain the second mixture;

[0036] Step 3: Stir the second mixture to cool down to 40°C, add a pH buffer stabilizer, stir and disperse evenly, and obtain a corrosion inhibitor.

Embodiment 4～6

[0038] A chilled water corrosion inhibitor for inhibiting electrochemical corrosion, its raw material components are shown in Table 1, and its preparation method comprises the following steps:

[0039] Step 1: According to the dosage in Table 1, mix cyanuric chloride, benzotriazole, 2-mercaptobenzothiazole with the solvent, heat up to 90°C and stir for 2 hours after sealing, then cool down to 85°C and keep warm React for 1h to obtain the first mixture;

[0040] Step 2: Stir and cool down the first mixture to 75° C., put in diethoxymethylphenylsilane and stir for 1 hour to obtain the second mixture;

[0041] Step 3: Stir the second mixture to cool down to 35°C, add a pH buffer stabilizer, stir and disperse evenly, and obtain a corrosion inhibitor.

Embodiment 7～9

[0043] A chilled water corrosion inhibitor for inhibiting electrochemical corrosion, its raw material components are shown in Table 1, and its preparation method comprises the following steps:

[0044] Step 1: According to the dosage in Table 1, mix cyanuric chloride, benzotriazole, 2-mercaptobenzothiazole with the solvent, heat up to 95°C and stir for 3 hours after sealing, then cool down to 80°C and keep warm React for 2h to obtain the first mixture;

[0045] Step 2: Stir and cool down the first mixture to 65° C., put in diethoxymethylphenylsilane and stir for 2 hours to obtain the second mixture;

[0046] Step 3: Stir and lower the temperature of the second mixture to 55° C., add 4,4-bipyridine and a pH buffer stabilizer, stir and disperse evenly, and obtain a corrosion inhibitor.

[0047] Table 1. The dosage of corrosion inhibitor raw materials in Examples 1-9 (unit: kg)

[0048]

[0049] Among them, diethoxymethylphenylsilane is purchased from Hubei Xinghengye Techno...

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Abstract

The invention relates to a chilled water corrosion inhibitor for inhibiting electrochemical corrosion and a preparation method thereof, and belongs to the field of corrosion inhibitors. The chilled water corrosion inhibitor is prepared from the following raw materials: cyanuric chloride, diethoxy methyl phenyl silane, benzotriazole, 2-mercaptobenzothiazole, a pH buffer stabilizer and a solvent. The preparation method comprises the following steps of mixing the cyanuric chloride, the benzotriazole, the 2-mercaptobenzothiazole and the solvent, heating to 90-95 DEG C, carrying out stirring reaction for 4-5 hours, cooling to 80-85 DEG C, and carrying out heat preservation reaction for 2-3 hours; when cooling to 65-75 DEG C, adding the diethoxy methyl phenyl silane, and carrying out stirring reaction for 2-3 hours; and when cooling to 35-55 DEG C, adding the pH buffer stabilizer, and uniformly stirring and dispersing to obtain the corrosion inhibitor. The corrosion inhibitor disclosed by the invention is free of phosphorus, is more green and environmentally friendly, and has stable and good electrochemical corrosion resistance and scale inhibition effects.

Description

technical field [0001] The invention relates to the field of corrosion inhibitors, in particular to a chilled water corrosion inhibitor for inhibiting electrochemical corrosion and a preparation method thereof. Background technique [0002] In recent years, central air conditioners have become more and more popular in industrial production, office spaces and residential buildings. The central air conditioners on the market generally use the heat absorption when the liquid vaporizes and the heat release effect when it condenses to achieve cooling. The central air conditioner consists of four major components. Compressor, condenser, throttling device, and evaporator, among which there is a chilled water circulation system connected at both ends of the evaporator. The heat absorbed by the refrigerant will reduce the temperature of the chilled water, so that the low-temperature water flows to the user end, and then passes through The fan coil performs heat exchange and blows col...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/10
CPCC23F11/10
Inventor 何星亮梁玲玲李燕玲郭大海
Owner 广州市粤新工程技术有限公司
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