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Corrosion inhibitor for cooling water of marine diesel engine and preparation method thereof

A technology for diesel engines and corrosion inhibitors, applied in chemical instruments and methods, organic chemistry, descaling and water softening, etc., can solve the problems affecting heat transfer efficiency and equipment life, inorganic salt scaling, aluminum and aluminum alloy protection Weakness and other problems, to achieve the effect of inhibiting the surface dirt inside the condensate pipe, good scale inhibition performance, and continuous and effective heat transfer efficiency

Active Publication Date: 2022-07-29
威海翔泽新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many chemicals are compounded with one or more of the above-mentioned raw materials, which have a good protective effect on carbon steel, copper and copper alloys, and stainless steel, but these corrosion inhibitors have weak protective effects on aluminum and aluminum alloys
Most of the pipelines in the cooling water system of marine diesel engines are made of alloy materials, especially aluminum and aluminum alloy materials are more popular. In addition, the cooling water systems of marine diesel engines mostly use tap water. Once the water temperature exceeds 60°C, the system is prone to inorganic salt scaling, which affects Heat transfer efficiency and equipment life

Method used

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  • Corrosion inhibitor for cooling water of marine diesel engine and preparation method thereof
  • Corrosion inhibitor for cooling water of marine diesel engine and preparation method thereof
  • Corrosion inhibitor for cooling water of marine diesel engine and preparation method thereof

Examples

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Effect test

Embodiment 1

[0030] A method for preparing a corrosion inhibitor for marine diesel engine cooling water, which comprises the following steps:

[0031] Step (1) pre-reaction treatment process: thoroughly clean the three-necked flask, stirring paddle, etc., check the tightness of the system, ensure that the sealing is good, and the stirring and other operations are normal;

[0032] Add 334.0g of 2-mercaptobenzothiazole (MBT) and 0.4g of sodium hydroxide to the three-necked flask, add an appropriate amount of 100g of water to dissolve the sodium hydroxide to ensure that the pH of the reaction system is greater than or equal to 9, and then seal the inside of the three-necked flask to evacuated to Below -0.09mPa, make the inside of the three-necked flask under the condition of negative pressure, and then suck 4.6g of ethanol into the three-necked flask under negative pressure and stir until the 2-mercaptobenzothiazole is completely dissolved;

[0033] Step (2) Reaction process: the three-necked...

Embodiment 2

[0036] A method for preparing a corrosion inhibitor for marine diesel engine cooling water, which comprises the following steps:

[0037] Step (1) pre-reaction treatment process: thoroughly clean the three-necked flask, stirring paddle, etc., check the tightness of the system, ensure that the sealing is good, and the stirring and other operations are normal;

[0038] Add 534.4g of 2-mercaptobenzothiazole (MBT) and 0.4g of sodium hydroxide to the three-necked flask, add an appropriate amount of 100g of water to dissolve the sodium hydroxide to ensure that the pH of the reaction system is greater than or equal to 9, and then seal the three-necked flask and vacuumize the interior to Below -0.09mPa, make the inside of the three-necked flask under the condition of negative pressure, and then suck 4.6g of ethanol into the three-necked flask under negative pressure and stir until the 2-mercaptobenzothiazole is completely dissolved;

[0039] Step (2) Reaction process: the three-necked...

Embodiment 3

[0042] A method for preparing a corrosion inhibitor for marine diesel engine cooling water, which comprises the following steps:

[0043]Step (1) pre-reaction treatment process: thoroughly clean the three-necked flask, stirring paddle, etc., check the tightness of the system, ensure that the sealing is good, and the stirring and other operations are normal;

[0044] Add 417.5g of 2-mercaptobenzothiazole (MBT) and 0.4g of sodium hydroxide to the three-necked flask, add an appropriate amount of 100g of water to dissolve the sodium hydroxide to ensure that the pH of the reaction system is greater than or equal to 9, and then seal the three-necked flask and vacuumize the interior to Below -0.09mPa, make the inside of the three-necked flask under the condition of negative pressure, and then suck 4.6g of ethanol into the three-necked flask under negative pressure and stir until the 2-mercaptobenzothiazole is completely dissolved;

[0045] Step (2) reaction process: the three-necked ...

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Abstract

The invention discloses a corrosion inhibitor for cooling water of a marine diesel engine and a preparation method thereof, which solve the problems in the prior art that the existing corrosion inhibitor has poor water solubility, weak protective effect on the metal inside the condensate pipe, especially Marine diesel engine condensate pipes have poor corrosion inhibition performance, resulting in short service life, and the existing corrosion inhibitors are easy to scale and affect the heat transfer effect of the condensate pipes. The corrosion inhibitor for marine diesel engine cooling water of the present invention is a reaction product mercaptobenzothiazole polymer obtained by ring-opening addition reaction of mercaptobenzothiazole and ethylene oxide; meanwhile, a preparation method thereof is also provided, which can be widely used In the field of cooling water anti-corrosion control technology.

Description

technical field [0001] The invention belongs to the technical field of anticorrosion control of cooling water, and particularly relates to a corrosion inhibitor for cooling water of marine diesel engines and a preparation method thereof. Background technique [0002] The marine diesel engine is the heart of the ship and plays an important role in the sailing process. In order to make the diesel engine work safely and effectively at a suitable temperature, the cooling water system of the engine is particularly important. During the use of marine diesel engines, due to the lack of scientific understanding of the cooling system, the cooling water cannot be properly inspected and the cooling water can not be protected in time, and even the lower the cooling water temperature, the better, which affects the normal function of the cooling system and causes the diesel engine to run. Instability, its service life is greatly reduced. Diesel engine cooling water must be carefully trea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D277/74
CPCC23F11/165C02F5/12C07D277/74
Inventor 程晓婷程显林张爱国
Owner 威海翔泽新材料科技有限公司
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