A pollution-free rust-preventive oil and its preparation method

Abstract

This invention relates to a pollution-free rust-preventive oil and its preparation method, belonging to the technical field of rust-preventive oils. This invention uses No. 10 machine oil as a carrier, allowing other functional additives to be uniformly dispersed in the oil. Rust inhibitors such as barium petroleum sulfonate, sodium petroleum sulfonate, and zinc naphthenate can form a protective film on the metal surface, collectively enhancing the rust-preventive effect. Benzotriazole, as a corrosion inhibitor, can form a dense passivation film on the metal surface, working synergistically with the rust inhibitors. Sodium dodecyl sulfonate has excellent dispersing and emulsifying properties, helping other additives to be better dispersed in the base oil. Furthermore, sodium dodecyl sulfonate can enhance the rust-preventive film. 3-Mercaptopropyltrimethoxysilane can enhance the adhesion and water resistance of the rust-preventive film, improving the overall performance of the rust-preventive oil. The addition of modified lanolin can improve the stability of the rust-preventive oil, enabling it to maintain good rust-preventive effects under various environmental conditions.

Description

Technical Field

[0001] This invention belongs to the field of rust-preventive oil technology, and relates to a pollution-free rust-preventive oil and its preparation method. Background Technology

[0002] Rust prevention is a crucial step in metal processing and storage. Traditional rust-preventive oils often contain environmentally harmful chemicals, posing potential health risks during use and causing pollution during disposal. With increasing environmental awareness, the demand for pollution-free rust-preventive oils is growing.

[0003] Currently, rust-preventive oil products on the market often have shortcomings in their formulation and preparation processes, such as poor rust prevention, poor stability, and easy decomposition. Some pollution-free rust-preventive oils may use more expensive raw materials or complex preparation processes, thereby increasing production costs. Furthermore, some pollution-free rust-preventive oils may affect subsequent treatments (such as painting and welding) during the surface treatment of metal parts. At the same time, improper control of process parameters during the preparation of these rust-preventive oils may lead to unstable quality of the finished product, thus affecting its rust prevention performance and service life.

[0004] Therefore, it is necessary to develop a new type of pollution-free rust-preventive oil and its preparation method to solve the problems existing in the current technology. By optimizing the formula and preparation process, the rust-preventive oil's rust-preventive performance, stability, and environmental friendliness can be improved, while reducing production costs and meeting market demands. Summary of the Invention

[0005] The purpose of this invention is to provide a pollution-free rust-preventive oil and its preparation method, which has the characteristics of good rust prevention performance.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A pollution-free rust-preventive oil, the formulation of which is as follows (by weight percentage): 75-85% No. 10 machine oil, 5-8% barium petroleum sulfonate, 2-5% modified lanolin, 1-2% sodium petroleum sulfonate, 1-2% zinc naphthenate, 0.05-0.1% benzotriazole, 1-2% oleic acid, 0.9-0.95% triethanolamine, 2-3% sodium dodecyl sulfonate, and 2-3% 3-mercaptopropyltrimethoxysilane.

[0008] The preparation method of modified lanolin is as follows:

[0009] S1.1: Heat lanolin to 35-40℃ to make it melt, keep it at a constant temperature for 0.5h, stir at 120r / min and slowly heat to 80℃, add rosin, wherein the mass ratio of rosin to lanolin is (0.5-1):1, and continue stirring at 80℃ for 2h to obtain mixture A;

[0010] S1.2: Sodium dodecylbenzenesulfonate and beeswax are mixed at a mass ratio of 1:(1~2) and ground in a ball mill for 0.5 h to obtain mixed solid B;

[0011] S1.3: Reduce the temperature of mixture A to 70°C and increase the rotation speed to 180 r / min. Add mixed solid B to mixture A. The mass ratio of mixture A to mixed solid B is (5-7):1. Stir for 2 hours to obtain the modified lanolin.

[0012] Furthermore, the heating rate of lanolin in S1.1 is 5°C / min.

[0013] Furthermore, in step S1.1, the rate of slowly heating to 80°C is 2°C / min.

[0014] Furthermore, in S1.2, the rotational speed of the ball mill is 500 r / min.

[0015] Furthermore, the particle size of the mixed solid B obtained by grinding in S1.2 is 500 mesh.

[0016] A method for preparing a pollution-free rust-preventive oil, the specific steps of which are as follows:

[0017] S6.1: Heat No. 10 machine oil to 50-60℃, stir at 180r / min for 1h, then add barium petroleum sulfonate, modified lanolin, sodium petroleum sulfonate and zinc naphthenate in proportion, and continue stirring for 1-2h to obtain mixture C;

[0018] S6.2: Continue stirring, adjust the speed to 160 r / min, then add benzotriazole, oleic acid and triethanolamine, and stir for 1-2 hours to obtain mixture D;

[0019] S6.3: Slowly lower the temperature to 30-40℃, and after maintaining the temperature, add sodium dodecyl sulfonate and 3-mercaptopropyltrimethoxysilane to mixture D, and continue stirring at 160 r / min for 2 h to obtain mixture E;

[0020] S6.4: Filter mixture E using a filter cloth and let it stand for 6 hours to obtain the pollution-free rust-preventive oil.

[0021] Furthermore, the heating rate in S6.1 is 2℃ / min.

[0022] Furthermore, the cooling rate in S6.3 is 1℃ / min.

[0023] Furthermore, the filter cloth in S6.4 has a pore size of 500 mesh.

[0024] Furthermore, the pollution-free rust-preventive oil prepared in step S6.4 is stored in an environment with a temperature of 25°C and a humidity of 20-25%.

[0025] This invention uses No. 10 machine oil as a carrier, allowing other functional additives to be uniformly dispersed in the oil. As a base oil, No. 10 machine oil utilizes its own oil effect to physically adsorb corrosion inhibitors in areas where adsorption is low, working together with rust inhibitor molecules to block pores and create a more complete and dense adsorption film. Rust inhibitors such as barium petroleum sulfonate, sodium petroleum sulfonate, and zinc naphthenate can form a protective film on the metal surface. These protective films are complementary, jointly enhancing the rust-preventive effect. Benzotriazole, as a corrosion inhibitor, can form a dense passivation film on the metal surface, working together with other rust inhibitors to further improve rust prevention performance. Sodium dodecyl sulfonate has excellent dispersing and emulsifying properties, helping other additives to better disperse in the base oil, improving the uniformity and stability of the rust-preventive oil. Furthermore, sodium dodecyl sulfonate can enhance the rust-preventive film through its hydrophilic molecular structure. The interaction of the sulfonic acid groups and hydrophobic groups with the metal surface enhances the density and stability of the rust-preventive film. Furthermore, sodium dodecyl sulfonate can synergistically enhance the rust-preventive performance and stability of the rust-preventive oil with sodium petroleum sulfonate in the formulation. This is because the sulfonic acid groups in the sodium petroleum sulfonate molecule can chemically react with the metal surface to form a dense protective film. This film effectively isolates the metal from contact with oxygen and moisture in the air, slowing down the corrosion rate. When the two are combined, a denser and more stable composite protective film can be formed on the metal surface. This film not only enhances the physical barrier effect but may also further improve the rust-preventive performance through chemical action. 3-Mercaptopropyltrimethoxysilane enhances the adhesion and water resistance of the rust-preventive film, enabling it to maintain good rust-preventive effects even in humid environments. It works in conjunction with other additives to improve the overall performance of the rust-preventive oil.

[0026] The main principle behind the rust-preventive effect of 3-mercaptopropyltrimethoxysilane is as follows: One end of 3-mercaptopropyltrimethoxysilane contains a thiol (-SH) functional group, which can form covalent bonds with the metal surface, exhibiting strong metalophilic properties and thus providing excellent adhesion to the metal. The other end contains three hydrolyzable methoxysilane functional groups. These groups hydrolyze to generate silanols, which can react with oxides formed on the metal surface to form chemical bonds. In this way, 3-mercaptopropyltrimethoxysilane can firmly bond the organic polymer to the inorganic metal surface, forming a dense protective film on the metal surface. Specifically, when a solution of 3-mercaptopropyltrimethoxysilane comes into contact with the metal surface, its methoxysilane groups hydrolyze to generate silanols, releasing methanol simultaneously. The silanols further undergo a condensation reaction with the hydroxyl groups on the metal surface (possibly originating from metal oxides or moisture from the processing), forming strong chemical bonds. The thiol group forms a covalent bond with the metal atom, further strengthening the adhesion between the protective film and the metal surface. In addition, the thiol group of 3-mercaptopropyltrimethoxysilane can also react with unsaturated esters, polyesters and other substances, which further enhances its multifunctionality and rust-preventive effect in rust-preventive oil.

[0027] Therefore, the addition of 3-mercaptopropyltrimethoxysilane can further form a dense and strong protective film on the metal surface, effectively isolating air and moisture, preventing metal corrosion and oxidation, and thus achieving a significant rust prevention effect.

[0028] This invention also incorporates modified lanolin, which possesses excellent lubricity and adhesion, enhancing the density and adhesion of the anti-rust film and improving its anti-rust effect. As a natural resin, rosin increases the adhesion and hardness of lanolin while improving its dispersibility and stability in the anti-rust oil. Through mixing with lanolin, it forms a more robust and durable protective film, thereby enhancing the anti-rust effect. Sodium dodecylbenzenesulfonate has excellent emulsifying, dispersing, and wetting properties. During the modification of lanolin, it helps other components disperse better within the lanolin, while also increasing the affinity between the modified lanolin and the metal surface, resulting in a more uniform and dense protective film. Beeswax, with its excellent water-repellent and lubricating properties, further enhances the anti-rust performance of lanolin and protects the metal surface from moisture and other corrosive substances. Simultaneously, beeswax also increases the flexibility and gloss of the protective film.

[0029] The rosin, sodium dodecylbenzene sulfonate, and beeswax in modified lanolin work synergistically to form a more robust, uniform, and dense protective film, effectively isolating moisture, oxygen, and other corrosive substances. This significantly enhances the rust-preventive properties of the oil. The addition of modified lanolin also improves the stability of the rust-preventive oil, maintaining its excellent rust-preventive effect under various environmental conditions. This helps extend the service life of metal products and reduce losses caused by rust. Modified lanolin also possesses good lubricity and fluidity, making it easier to apply and evenly distribute the rust-preventive oil on the metal surface. This not only improves application efficiency but also reduces friction and damage to the metal surface during use.

[0030] The rust-preventive oil formula of this invention mainly uses environmentally friendly additives, with No. 10 machine oil as the base oil, and rust inhibitors such as barium petroleum sulfonate, sodium petroleum sulfonate, and zinc naphthenate. These components are relatively environmentally friendly and do not easily decompose to produce harmful substances. Although additives such as benzotriazole and triethanolamine in the formula have certain chemical activity, their usage in this formula is low, and these components themselves have relatively low toxicity, posing less harm to the environment and human body during use. Additives such as oleic acid and sodium dodecyl sulfonate have certain biodegradability, which means that they can be decomposed by microorganisms in the environment, reducing the risk of long-term environmental pollution. Furthermore, this formula improves the stability and rust-preventive performance of the rust-preventive oil by optimizing the component combination, thereby reducing the need for repeated application and cleaning due to poor rust prevention effect, and thus reducing the harmful emissions that may be generated during the cleaning process. Detailed Implementation

[0031] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with embodiments, is provided below.

[0032] Example 1

[0033] The pollution-free rust-preventive oil formula is as follows, by weight percentage: No. 10 machine oil 77%, barium petroleum sulfonate 5%, modified lanolin 5%, sodium petroleum sulfonate 2%, zinc naphthenate 2%, benzotriazole 0.1%, oleic acid 2%, triethanolamine 0.9%, sodium dodecyl sulfonate 3%, 3-mercaptopropyltrimethoxysilane 3%.

[0034] The preparation method of modified lanolin is as follows:

[0035] S1.1: Heat lanolin to 40°C at a rate of 5°C / min until it is in a molten state. After holding the temperature for 0.5 hours, stir at 120 r / min and slowly raise the temperature to 80°C at a rate of 2°C / min. Add rosin, wherein the mass ratio of rosin to lanolin is 1:1. Continue stirring at 80°C for 2 hours to obtain mixture A.

[0036] S1.2: Sodium dodecylbenzenesulfonate and beeswax are mixed at a mass ratio of 1:1 and ground in a ball mill for 0.5 hours at a speed of 500 r / min to obtain mixed solid B with a particle size of 500 mesh.

[0037] S1.3: The temperature of mixture A is reduced to 70°C and the rotation speed is increased to 180 r / min. Mixed solid B is added to mixture A. The mass ratio of mixture A to mixed solid B is 6:1. After stirring for 2 hours, the modified lanolin is obtained.

[0038] A method for preparing a pollution-free rust-preventive oil, the specific steps of which are as follows:

[0039] S6.1: Heat No. 10 machine oil to 55°C at a rate of 2°C / min, stir at 180r / min for 1h, then add barium petroleum sulfonate, modified lanolin, sodium petroleum sulfonate and zinc naphthenate in proportion, and continue stirring for 2h to obtain mixture C.

[0040] S6.2: Continue stirring, adjust the speed to 160 r / min, then add benzotriazole, oleic acid and triethanolamine, and stir for 2 hours to obtain mixture D;

[0041] S6.3: Slowly reduce the temperature to 30℃ at a rate of 1℃ / min, and after maintaining the temperature, add sodium dodecyl sulfonate and 3-mercaptopropyltrimethoxysilane to mixture D, and continue stirring at a speed of 160r / min for 2h to obtain mixture E;

[0042] S6.4: Filter mixture E using a 500-mesh filter cloth and let it stand for 6 hours to obtain the pollution-free rust-preventive oil. The storage environment temperature is 25℃ and the humidity is 20%.

[0043] Example 2

[0044] The pollution-free rust-preventive oil formula is as follows, by weight percentage: No. 10 machine oil 75%, barium petroleum sulfonate 8%, modified lanolin 5%, sodium petroleum sulfonate 2%, zinc naphthenate 2%, benzotriazole 0.05%, oleic acid 2%, triethanolamine 0.95%, sodium dodecyl sulfonate 2%, and 3-mercaptopropyltrimethoxysilane 3%.

[0045] The preparation method of modified lanolin is as follows:

[0046] S1.1: Heat lanolin to 35°C at a rate of 5°C / min until it is in a molten state. After holding the temperature at 0.5h, stir at 120r / min and slowly raise the temperature to 80°C at a rate of 2°C / min. Add rosin, wherein the mass ratio of rosin to lanolin is 0.5:1. Continue stirring at 80°C for 2h to obtain mixture A.

[0047] S1.2: Sodium dodecylbenzenesulfonate and beeswax are mixed at a mass ratio of 1:1 and ground in a ball mill for 0.5 hours at a speed of 500 r / min to obtain mixed solid B with a particle size of 500 mesh.

[0048] S1.3: The temperature of mixture A is reduced to 70°C and the rotation speed is increased to 180 r / min. Mixed solid B is added to mixture A. The mass ratio of mixture A to mixed solid B is 5:1. After stirring for 2 hours, the modified lanolin is obtained.

[0049] A method for preparing a pollution-free rust-preventive oil, the specific steps of which are as follows:

[0050] S6.1: Heat No. 10 machine oil to 50°C at a rate of 2°C / min, stir at 180r / min for 1h, then add barium petroleum sulfonate, modified lanolin, sodium petroleum sulfonate and zinc naphthenate in proportion, and continue stirring for 1h to obtain mixture C.

[0051] S6.2: Continue stirring, adjust the speed to 160 r / min, then add benzotriazole, oleic acid and triethanolamine, and stir for 1 hour to obtain mixture D;

[0052] S6.3: Slowly reduce the temperature to 40℃ at a rate of 1℃ / min, and after maintaining the temperature, add sodium dodecyl sulfonate and 3-mercaptopropyltrimethoxysilane to mixture D, and continue stirring at a speed of 160r / min for 2h to obtain mixture E;

[0053] S6.4: Filter mixture E using a 500-mesh filter cloth and let it stand for 6 hours to obtain the pollution-free rust-preventive oil. The storage environment temperature is 25℃ and the humidity is 25%.

[0054] Example 3

[0055] The pollution-free rust-preventive oil formula is as follows, by weight percentage: 85% No. 10 machine oil, 5% barium petroleum sulfonate, 2% modified lanolin, 1% sodium petroleum sulfonate, 1% zinc naphthenate, 0.1% benzotriazole, 1% oleic acid, 0.9% triethanolamine, 2% sodium dodecyl sulfonate, and 2% 3-mercaptopropyltrimethoxysilane.

[0056] The preparation method of modified lanolin is as follows:

[0057] S1.1: Heat lanolin to 35-40°C at a rate of 5°C / min until it is in a molten state. After holding the temperature at 0.5h, stir at 120r / min and slowly raise the temperature to 80°C at a rate of 2°C / min. Add rosin, wherein the mass ratio of rosin to lanolin is 1:1. Continue stirring at 80°C for 2h to obtain mixture A.

[0058] S1.2: Sodium dodecylbenzenesulfonate and beeswax are mixed at a mass ratio of 1:2 and ground in a ball mill for 0.5 hours at a speed of 500 r / min to obtain mixed solid B with a particle size of 500 mesh.

[0059] S1.3: The temperature of mixture A is lowered to 70°C and the rotation speed is increased to 180 r / min. Mixed solid B is added to mixture A. The mass ratio of mixture A to mixed solid B is 7:1. After stirring for 2 hours, the modified lanolin is obtained.

[0060] A method for preparing a pollution-free rust-preventive oil, the specific steps of which are as follows:

[0061] S6.1: Heat No. 10 machine oil to 60℃ at a rate of 2℃ / min, stir at 180r / min for 1h, then add barium petroleum sulfonate, modified lanolin, sodium petroleum sulfonate and zinc naphthenate in proportion, and continue stirring for 2h to obtain mixture C.

[0062] S6.2: Continue stirring, adjust the speed to 160 r / min, then add benzotriazole, oleic acid and triethanolamine, and stir for 2 hours to obtain mixture D;

[0063] S6.3: Slowly reduce the temperature to 40℃ at a rate of 1℃ / min, and after maintaining the temperature, add sodium dodecyl sulfonate and 3-mercaptopropyltrimethoxysilane to mixture D, and continue stirring at a speed of 160r / min for 2h to obtain mixture E;

[0064] S6.4: Filter mixture E using a 500-mesh filter cloth and let it stand for 6 hours to obtain the pollution-free rust-preventive oil. The storage environment temperature is 25℃ and the humidity is 20%.

[0065] Comparative Example 1

[0066] In this comparative example, no rosin was added during the lanolin modification process, and the remaining steps were the same as in Example 1.

[0067] Comparative Example 2

[0068] In this comparative example, sodium dodecylbenzenesulfonate was not added during the lanolin modification process, and the remaining steps were the same as in Example 1.

[0069] Comparative Example 3

[0070] In this comparative example, beeswax was not added during the lanolin modification process, and the remaining steps were the same as in Example 1.

[0071] Comparative Example 4

[0072] This comparative example does not modify lanolin; the remaining steps are the same as in Example 1.

[0073] Comparative Example 5

[0074] In this comparative example, sodium dodecyl sulfonate was not added during the preparation of the pollution-free rust-preventive oil, and the remaining steps were the same as in Example 1.

[0075] Comparative Example 6

[0076] In this comparative example, 3-mercaptopropyltrimethoxysilane was not added during the preparation of the pollution-free rust-preventive oil, and the remaining steps were the same as in Example 1.

[0077] The rust-preventive performance of the examples and comparative examples was tested according to standard SH / T 0533-93(2004), and the experimental results are summarized in the table below.

[0078]

[0079]

[0080] The above experiments show that modifying lanolin and adding sodium dodecyl sulfonate and 3-mercaptopropyltrimethoxysilane effectively improves the performance of rust-preventive oil.

[0081] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A pollution-free rust-preventive oil, characterized in that, The pollution-free rust-preventive oil is composed of the following components, by mass percentage: 75-85% No. 10 machine oil, 5-8% barium petroleum sulfonate, 2-5% modified lanolin, 1-2% sodium petroleum sulfonate, 1-2% zinc naphthenate, 0.05-0.1% benzotriazole, 1-2% oleic acid, 0.9-0.95% triethanolamine, 2-3% sodium dodecyl sulfonate, and 2-3% 3-mercaptopropyltrimethoxysilane. The preparation method of modified lanolin is as follows: S1.1: Heat lanolin to 35-40℃ to make it melt, keep it at a constant temperature for 0.5h, stir at 120r / min and slowly heat to 80℃, add rosin, wherein the mass ratio of rosin to lanolin is (0.5-1):1, and continue stirring at 80℃ for 2h to obtain mixture A; S1.2: Sodium dodecylbenzenesulfonate and beeswax are mixed at a mass ratio of 1:(1~2) and ground in a ball mill for 0.5 h to obtain mixed solid B; S1.3: Reduce the temperature of mixture A to 70°C and increase the rotation speed to 180 r / min. Add mixed solid B to mixture A. The mass ratio of mixture A to mixed solid B is (5-7):

1. Stir for 2 hours to obtain the modified lanolin.

2. The pollution-free rust-preventive oil according to claim 1, characterized in that, The heating rate of lanolin in S1.1 is 5℃ / min.

3. The pollution-free rust-preventive oil according to claim 1, characterized in that, The rate at which the temperature is slowly increased to 80°C in S1.1 is 2°C / min.

4. The pollution-free rust-preventive oil according to claim 1, characterized in that, The rotational speed of the ball mill in S1.2 is 500 r / min.

5. The pollution-free rust-preventive oil according to claim 1, characterized in that, The particle size of the mixed solid B obtained by grinding in S1.2 is 500 mesh.

6. A method for preparing a pollution-free rust-preventive oil, based on the pollution-free rust-preventive oil according to any one of claims 1 to 5, characterized in that, The specific steps of the preparation method are as follows: S6.1: Heat No. 10 machine oil to 50-60℃, stir at 180r / min for 1h, then add barium petroleum sulfonate, modified lanolin, sodium petroleum sulfonate and zinc naphthenate in proportion, and continue stirring for 1-2h to obtain mixture C; S6.2: Continue stirring, adjust the speed to 160 r / min, then add benzotriazole, oleic acid and triethanolamine, and stir for 1-2 hours to obtain mixture D; S6.3: Slowly lower the temperature to 30-40℃, and after maintaining the temperature, add sodium dodecyl sulfonate and 3-mercaptopropyltrimethoxysilane to mixture D, and continue stirring at 160 r / min for 2 h to obtain mixture E; S6.4: Filter mixture E using a filter cloth and let it stand for 6 hours to obtain the pollution-free rust-preventive oil.

7. The method for preparing a pollution-free rust-preventive oil according to claim 6, characterized in that, The heating rate in S6.1 is 2℃ / min.

8. The method for preparing a pollution-free rust-preventive oil according to claim 6, characterized in that, The cooling rate in S6.3 is 1℃ / min.

9. The method for preparing a pollution-free rust-preventive oil according to claim 6, characterized in that, The filter cloth in S6.4 has a pore size of 500 mesh.

10. The method for preparing a pollution-free rust-preventive oil according to claim 6, characterized in that, The pollution-free rust-preventive oil prepared in S6.4 is stored at an ambient temperature of 25°C and a humidity of 20-25%.

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