Antirust agent for closed cleaning of hydraulic valve element and preparation method of antirust agent

Abstract

The invention provides an antirust agent for closed cleaning of a hydraulic valve element and a preparation method of the antirust agent. The antirust agent comprises the following components in percentage by weight: 15-25% of organic amine, 0.5-1% of triazole, 1-2% of triethanolamine oleic soap, 2-3% of boric acid ester, 1.5-3% of tribasic acid and the balance of water. The antirust agent disclosed by the invention has a corrosion inhibition effect on common materials such as cast iron, carbon steel and brass of hydraulic valve elements, and can be used for cleaning all the elements made of the materials on a closed automatic line; the effective anti-rust time or corrosion condition of the cleaned workpiece completely meets the placement requirements during assembly and pressure test; and the antirust agent does not contain sodium nitrite and other components harmful to the human body or the environment, does not contain an organic solvent, and can be safely used for a long time.

Description

Technical Field

[0001] The invention relates to the technical field of metal rust prevention and cleaning, and in particular to a rust preventive for closed cleaning of hydraulic valve components and a preparation method thereof. Background Art

[0002] Hydraulic valves are widely used in various aspects of industrial and agricultural production. Due to functional requirements, different parts of the valve body are made of different materials, including aluminum alloy, cast iron, carbon steel and brass, etc. Among them, cast iron, carbon steel and brass generally need to be cleaned. Because of the need for valve body pressure, liquid flow control and flow direction change, there are many holes on the hydraulic valve components. Therefore, each component must not only be produced accurately, but also be cleaned before the valve body is assembled, especially the holes, and each component must not be corroded. Therefore, the last process before most components are assembled is cleaning and rust prevention.

[0003] In order to improve the cleaning efficiency, many manufacturers use automated cleaning lines. The general process is: ultrasonic cleaning - spray cleaning - ultrasonic cleaning - water washing - rust prevention - water blowing - hot air drying. Some manufacturers use two hot air drying processes. The general cleaning temperature is 45-50 degrees Celsius. Except for the loading and unloading ports, the entire cleaning line is basically closed. Therefore, the workpiece is always in a high temperature and high humidity environment. In order to prevent the workpiece from rusting during the drying process and the subsequent assembly process, it is necessary to add a rust prevention process after water washing and before drying.

[0004] The requirement of this process is to prevent rust of all cleaned workpieces, to prevent rust of carbon steel and cast iron during drying and line stoppage, and corrosion of brass, while ensuring the corrosion inhibition effect of these components during the period of waiting for assembly and during the placement period after assembly. Summary of the invention

[0005] The object of the present invention is to provide a rust preventive for sealing and cleaning hydraulic valve components and a preparation method thereof, so as to solve the above-mentioned deficiencies of the prior art.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] A rust preventive for sealing and cleaning hydraulic valve components, the components and weight percentages of the rust preventive are:

[0008]

[0009] Furthermore, the organic amine is selected from one or more of monoethanolamine, diethanolamine and triethanolamine.

[0010] Furthermore, the triazole is a mixture of methylbenzotriazole and benzotriazole. Specifically, the ratio of methylbenzotriazole to benzotriazole is 3:2.

[0011] Furthermore, the borate is selected from diethanolamine borate and triethanolamine borate or a mixture of the two.

[0012] Furthermore, the tribasic acid is industrial grade tribasic acid.

[0013] A method for preparing a rust preventive for sealing and cleaning hydraulic valve components, the method for preparing the rust preventive for sealing and cleaning hydraulic valve components specifically comprises the following steps:

[0014] S1. Add half the required amount of tap water into the production tank, and add organic amine and industrial grade tribasic acid in sequence while slowly stirring;

[0015] S2. After sufficient stirring, add triethanolamine oleic acid soap and stir for 50-60 minutes until fully dissolved;

[0016] S3. Add triazole and borate in sequence, stir well, add the remaining required amount of water, and stir for another 15-20 minutes.

[0017] Furthermore, for step S1, if the preparation environment temperature is low, the mixed solution needs to be heated to 30-35 degrees after adding the organic amine.

[0018] Furthermore, in step S2, after the triethanolamine oleic acid soap is added, the mixed solution can be heated to 40-45 degrees to allow the triethanolamine oleic acid soap to dissolve quickly.

[0019] It can be seen from the above technical scheme that the rust inhibitor described in the present invention has a corrosion inhibition effect on cast iron, carbon steel and brass, which are commonly used materials for hydraulic valve components, and components of all these materials can be cleaned on a closed automatic line; the effective rust prevention time or corrosion inhibition of the workpiece after cleaning fully meets the placement requirements during assembly and pressure testing; and the rust inhibitor does not contain sodium nitrite and other ingredients that are harmful to the human body or the environment, does not contain organic solvents, and can be used safely for a long time. DETAILED DESCRIPTION

[0020] A preferred embodiment of the present invention is described in detail below.

[0021] Example 1

[0022] A rust preventive for sealing and cleaning hydraulic valve components, the components and their weight percentages are:

[0023]

[0024] Specifically, the organic amine is triethanolamine; the triazole is a mixture of methylbenzotriazole and benzotriazole, with the ratio of the two being 3:2; the borate is triethanolamine borate; and the tribasic acid is an industrial-grade tribasic acid with a content of 50%.

[0025] In this embodiment, the preparation process of the rust inhibitor is as follows: add half the required amount of tap water into the production tank, add triethanolamine while slowly stirring (it needs to be heated to 30-35 degrees in winter or when the preparation environment temperature is low), then add the tribasic acid, continue to stir and dissolve, then add triethanolamine oleic acid soap, and continue to stir for 60 minutes. If it is not completely dissolved, the mixed solution can be heated to 40-45 degrees, continue to stir until dissolved, and then add triazole and triethanolamine borate in sequence, stir well and evenly, add the remaining required amount of water, and stir for another 15-20 minutes.

[0026] Example 2

[0027] A rust preventive for sealing and cleaning hydraulic valve components, the components and their weight percentages are:

[0028]

[0029] Specifically, the organic amine is monoethanolamine; the triazole is a mixture of methylbenzotriazole and benzotriazole, with the ratio of the two being 3:2; the borate is a mixture of triethanolamine borate and diethanolamine borate, with the ratio of the two being 3:1; and the tribasic acid is an industrial-grade tribasic acid with a content of 50%.

[0030] The preparation process of the rust inhibitor described in this embodiment is the same as that of Example 1.

[0031] Example 3

[0032] A rust preventive for sealing and cleaning hydraulic valve components, the components and their weight percentages are:

[0033]

[0034] Specifically, the organic amine is a mixture of monoethanolamine and triethanolamine, and the ratio of the two is 1:2; the triazole is a mixture of methylbenzotriazole and benzotriazole, and the ratio of the two is 3:2; the borate is triethanolamine borate; and the tribasic acid is an industrial grade tribasic acid with a content of 50%.

[0035] The preparation process of the rust inhibitor described in this embodiment is the same as that of Embodiment 1 and Embodiment 2.

[0036] The rust removers prepared in the above three embodiments are used to automatically clean hydraulic valve components of common materials on a closed automatic line, and the effective rust prevention time or corrosion condition of the hydraulic valve components after cleaning is statistically analyzed. The specific data are shown in the following table:

[0037]

[0038] From the above data, it can be seen that the rust inhibitor described in the present invention has a certain rust prevention effect on hydraulic valve components made of cast iron and carbon steel, and has a good corrosion inhibition effect on hydraulic valve components made of brass. Specifically, for hydraulic valve components made of cast iron, the rust prevention time after cleaning with the rust inhibitor described in the present invention is 5-6 days, for hydraulic valve components made of carbon steel, the rust prevention time after cleaning with the rust inhibitor described in the present invention is 6-7 days, and for hydraulic valve components made of brass, no corrosion occurs after cleaning with the rust inhibitor described in the present invention.

[0039] It can be seen that the hydraulic valve components cleaned with the rust inhibitor described in the present invention fully meet the placement requirements during assembly and pressure testing; and the rust inhibitor does not contain ingredients harmful to the human body or the environment such as sodium nitrite, and does not contain organic solvents, and can be used safely for a long time.

[0040] The above-described embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A rust preventive for sealing and cleaning hydraulic valve components, characterized in that: The components of the rust inhibitor and their weight percentages are:

2. A rust preventive for sealing and cleaning hydraulic valve components according to claim 1, characterized in that: The organic amine is selected from one or more of monoethanolamine, diethanolamine and triethanolamine.

3. The rust preventive for sealing and cleaning hydraulic valve components according to claim 1, characterized in that: The triazole is a mixture of tolutriazole and benzotriazole. Specifically, the ratio of tolutriazole to benzotriazole is 3:

2.

4. The rust preventive for sealing and cleaning hydraulic valve components according to claim 1, characterized in that: The boric acid ester is selected from diethanolamine boric acid ester and triethanolamine boric acid ester or a mixture of the two.

5. The rust preventive for sealing and cleaning hydraulic valve components according to claim 1, characterized in that: The tribasic acid is industrial grade tribasic acid.

6. A method for preparing a rust preventive for sealing and cleaning hydraulic valve components, the method being used to produce the rust preventive for sealing and cleaning hydraulic valve components as claimed in any one of claims 1 to 5, characterized in that: The specific steps include: S1. Add half the required amount of tap water into the production tank, and add organic amine and industrial grade tribasic acid in sequence while slowly stirring; S2. After sufficient stirring, add triethanolamine oleic acid soap and stir for 50-60 minutes until fully dissolved; S3. Add triazole and borate in sequence, stir well, add the remaining required amount of water, and stir for another 15-20 minutes.

7. The method for preparing a rust inhibitor for sealing and cleaning hydraulic valve components according to claim 6, characterized in that: For step S1, if the preparation environment temperature is low, the mixed solution needs to be heated to 30-35 degrees after adding the organic amine.

8. The method for preparing a rust inhibitor for sealing and cleaning hydraulic valve components according to claim 6, characterized in that: In step S2, after adding the triethanolamine oleic acid soap, the mixed solution can be heated to 40-45 degrees to quickly dissolve the triethanolamine oleic acid soap.

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