CN105154174A - A high-efficiency composite corrosion inhibitor for hydraulic support hydraulic fluid and its application - Google Patents

Abstract

A high-efficiency composite corrosion inhibitor for hydraulic fluid of a hydraulic support and an application thereof belong to the technical field of transmission media for coal mining equipment. The method for preparing the high-efficiency composite corrosion inhibitor for the hydraulic fluid of the hydraulic bracket at a certain temperature and normal pressure by using triethanolamine, monoethanolamine, sebacic acid, caprylic acid, boric acid, benzotriazole and the like as raw materials. Compared with the existing products, the corrosion inhibitor has high efficiency and obvious corrosion inhibition performance, has a corrosion inhibition effect on various metals, and has excellent stability in hydraulic fluid of the hydraulic support and long-term effectiveness.

Description

A high-efficiency composite corrosion inhibitor for hydraulic support hydraulic fluid and its application

technical field

The invention relates to a preparation method of a high-efficiency composite corrosion inhibitor used for hydraulic fluid of a hydraulic support, and belongs to the technical field of transmission media for coal mining equipment.

Background technique

As the main equipment for comprehensive mechanized coal mining, hydraulic support can provide operators with a safe working space and an effective power source for mining and transportation equipment. It is the key equipment for safe and efficient production in fully mechanized coal mining face. The support, lifting, moving, pushing and overload protection of the hydraulic support are all realized by the hydraulic support hydraulic fluid. As the "blood" of the hydraulic support system, its product performance is particularly important. At present, domestic coal mine hydraulic support hydraulic fluid is usually processed from base oil supplemented with a variety of functional additives, and its lubricity, stability, rust resistance, corrosion resistance, and compatibility with sealing materials must be satisfied. It can only be used underground in coal mines. The performance of hydraulic support hydraulic fluid depends largely on the performance of functional additives.

In actual use, the hydraulic support hydraulic fluid must meet the corrosion inhibition performance for cast iron, steel, copper and other metals stipulated in MT76-2011 "Emulsified oil, concentrated liquid and high water content hydraulic fluid for hydraulic supports", and also needs to be Galvanized layer, aluminum alloy and other metals provide corrosion inhibition. The existing corrosion inhibitors on the market have no significant effect, and can only inhibit the corrosion of a limited number of metals, and are likely to cause instability of the hydraulic fluid system of the hydraulic support. The high-efficiency composite anti-rust agent can form a physical and chemical adsorption film on the metal surface to isolate corrosive substances from the metal surface, which can effectively prevent the corrosion of the hydraulic support and ensure the safe and stable operation of the hydraulic support.

Contents of the invention

The purpose of the present invention is to prepare a kind of high-efficiency composite corrosion inhibitor for hydraulic support hydraulic fluid, which provides better corrosion protection for cast iron, steel, copper, galvanized layer, etc., and is applied in hydraulic support hydraulic fluid. And long-term effective.

The high-efficiency composite corrosion inhibitor for hydraulic support hydraulic fluid of the present invention is characterized in that triethanolamine, monoethanolamine, sebacic acid, octanoic acid, boric acid, and benzotriazole are used as raw materials at a certain temperature and normal pressure. Reaction is made, and main raw material and consumption ratio are as follows (wt%):

Triethanolamine 49～50%

Monoethanolamine 9-10%

Sebacic acid 9~10%

Caprylic acid 19-20%

Boric acid 9-10%

Benzotriazole 0.5-1%.

The production procedure of the present invention is: add triethanolamine, monoethanolamine and octanoic acid into the reaction kettle, heat to 95-100°C and stir evenly, add sebacic acid and boric acid until the white solid melts completely and bubbles are generated, cool to 60°C, Add benzotriazole and stir for at least 60 minutes, stir well and let stand to obtain the product.

Putting the product into the hydraulic fluid of the hydraulic support according to the mass percentage of 1 to 1.5%, can obtain high-efficiency corrosion inhibition effect.

The high-efficiency composite corrosion inhibitor of the present invention has less addition amount and excellent effect. At the same time, it has corrosion inhibition performance on cast iron, steel, copper and other metals, and also has excellent corrosion inhibition effect on other metals such as galvanized layer and aluminum alloy. The invention also has corrosion inhibitory effect on various metals, and the product has excellent stability in the hydraulic fluid of the hydraulic support and is effective for a long time.

Detailed ways

The following examples are used to further illustrate the present invention, but the present invention is not limited to the following examples.

Example 1

Add 50% triethanolamine, 10% monoethanolamine, and 20% caprylic acid into the reaction kettle according to the dosage ratio, heat to 95-100°C and stir evenly, then add 9.5% sebacic acid and 9.5% boric acid until the white solid melts completely and has bubbles produced, cooled to 60°C, added 1% benzotriazole and stirred for 60 minutes, stirred evenly and left to stand to obtain the product. The product is put into the hydraulic support hydraulic fluid according to the mass percentage of 1.5% and stirred evenly, which can obtain better rust and corrosion resistance, and has obvious corrosion inhibition performance on galvanized test pieces, which is better than adding ordinary Corrosion inhibitor for hydraulic support hydraulic fluid oil. The test values are as follows:

project Ordinary hydraulic fluid test results Hydraulic fluid test results after addition Rust resistance (cast iron) no rust no rust Corrosion resistance (steel rod, copper rod) No rust and no discoloration No rust and no discoloration Corrosion inhibition of galvanized test piece discoloration no discoloration

Rust resistance: refer to MT76-2011 "Emulsified Oil, Concentrate and High Water-Containing Hydraulic Fluid for Hydraulic Support", make a 5% test solution of hydraulic fluid and 500mg/L artificial hard water, and test it on cast iron at room temperature Spot the surface of the test piece, observe the surface of the test piece after standing for 24 hours, there should be no rust or color change.

Corrosion resistance: refer to MT76-2011 "Emulsified oil, concentrated liquid and high water content hydraulic fluid for hydraulic supports", make a 2% test solution of hydraulic fluid and 500mg/L artificial hard water, and immerse No. 15 steel rod in In the test solution at a temperature of 70°C, there should be no rust after 24 hours. Dip the No. 62 copper rod in the test solution at a temperature of 70°C, and there should be no rust and no color change after 24 hours.

Corrosion inhibition performance of galvanized test piece: make 5% test solution with hydraulic fluid and 500mg/L artificial hard water, soak the galvanized test piece in it at room temperature, observe the surface of the test piece after 24 hours, there should be no rust or discoloration.

Claims (4)

1. A high-efficiency composite corrosion inhibitor for hydraulic support hydraulic fluid is characterized in that, with triethanolamine, monoethanolamine, sebacic acid, octanoic acid, boric acid, benzotriazole as raw material, at a certain temperature and normal pressure The following reaction makes, main raw material and consumption ratio are as follows (wt%): Triethanolamine 49～50% Monoethanolamine 9-10% Sebacic acid 9~10% Caprylic acid 19-20% Boric acid 9-10% Benzotriazole 0.5-1%. 2. The method for preparing the high-efficiency composite corrosion inhibitor according to claim 1 is characterized in that it comprises the following steps: adding triethanolamine, monoethanolamine and octanoic acid to the reactor, heating to 95-100°C and stirring evenly, adding sebacic acid and boric acid , until the white solid melts completely and bubbles are generated, cool to 60°C, add benzotriazole and stir for at least 60 minutes, stir well and let stand to obtain the product. 3. The high-efficiency composite corrosion inhibitor according to claim 1 is used for hydraulic support hydraulic fluid, characterized in that the high-efficiency composite corrosion inhibitor has a mass percentage of 1 to 1.5%. 4. The hydraulic fluid comprising the high-efficiency composite corrosion inhibitor of claim 1.