A rust-preventive oil with high salt spray resistance

Abstract

This invention discloses a rust-preventive oil with high salt spray resistance, composed of the following components in parts by weight: 30-35 parts base oil, 8-9 parts rust-preventive additives, 3.5-6 parts film-forming agent, 0.2-0.3 parts ethylene oxide-propylene oxide block copolymer, and 54-58 parts solvent oil. This invention introduces the ethylene oxide-propylene oxide block copolymer into the rust-preventive oil system. The ethylene oxide-propylene oxide block copolymer, in combination with a film-forming agent composed of a specific ratio of oxidized wax, oxidized wax ester, and oxidized wax calcium soap, enables the oil to remain clear and free of precipitation at low temperatures, exhibiting excellent low-temperature stability. Furthermore, it ensures a dense and robust rust-preventive film on the surface of metal workpieces, thereby significantly improving the salt spray resistance of the rust-preventive oil. This makes it suitable for applications requiring high salt spray resistance, such as marine transportation.

Description

Technical Field

[0001] This invention relates to a rust-preventive oil with high salt spray resistance. Background Technology

[0002] Rust-preventive oil provides temporary protection against rust on steel products and products made primarily of steel, making it a common method for protecting metal products and reducing corrosion. Salt spray performance is a key indicator for evaluating rust-preventive oil performance and is instructive for its application in marine transportation scenarios. Chloride ions in salt spray tests easily penetrate the rust-preventive oil film on metal surfaces, thus accelerating metal corrosion. Improving the salt spray performance of rust-preventive oil usually requires adding various functional rust-preventive additives to the formulation. However, as the content and types of additives in rust-preventive oil increase, the solubility of the additives in the base oil and their compatibility decrease, leading to turbidity in the oil and the tendency for precipitation to occur during long-term storage, especially at low temperatures. Summary of the Invention

[0003] Purpose of the invention: The purpose of this invention is to provide a rust-preventive oil that has good salt spray resistance while meeting the requirements of low-temperature stability.

[0004] Technical solution: The rust-preventive oil with high salt spray resistance of the present invention is composed of the following components in parts by weight: 30-35 parts base oil, 8-9 parts rust-preventive additive, 3.5-6 parts film-forming agent, 0.2-0.3 parts ethylene oxide-propylene oxide block copolymer, and 54-58 parts solvent oil.

[0005] The base oil is one or more of paraffinic mineral oil or naphthenic mineral oil. The base oil serves as a carrier for the various additives in the rust-preventive oil, and is crucial for the adsorption and film formation of these components on the metal surface.

[0006] The rust-inhibiting additive comprises 3-4 parts by weight of barium petroleum sulfonate, 2-3 parts by weight of neutral dinonylnaphthalene sulfonate calcium, 3-4 parts by weight of dodecenylsuccinic acid, 0.2-0.3 parts by weight of phenolic antioxidant, and 0.2-0.3 parts by weight of N-oleoylsarcosine-octadecylamine salt. Sulfonate corrosion inhibitors exhibit excellent salt spray resistance and good displacement properties against water films and sweat. Dodecenylsuccinic acid has high solubility in mineral oil, and its molecule contains two carboxyl groups at the same end, allowing it to strongly adsorb onto metal surfaces and form a rust-preventive protective layer.

[0007] The film-forming agent is a composition of oxidized wax, oxidized wax ester, and oxidized wax calcium soap in a mass ratio of 0.5:2:1. This mass ratio of film-forming agent enables the formed rust-preventive adsorption film to be denser, thereby improving the salt spray performance of the rust-preventive oil.

[0008] The ethylene oxide-propylene oxide block copolymer has a number-average molecular weight of 2000-20000. This molecular weight allows the film-forming agent molecules (composed of 0.5:2:1 mass ratio of oxidized wax, oxidized wax ester, and oxidized wax calcium soap) to dissolve better in the rust-preventive oil system. Furthermore, it co-adsorbs with sulfonate molecules onto the metal surface to form a dense, strong, and resistant barrier film against chloride ions and water molecules. Simultaneously, the ethylene oxide-propylene oxide block copolymer synergistically enhances the adhesion strength of the oil film on the metal surface with sulfonate molecules, preventing the oil film from being washed away by condensate in a salt spray environment.

[0009] The solvent oil is an aromatic solvent oil, which is used to improve the dispersibility of rust inhibitors in the rust inhibitor system.

[0010] The rust-preventive oil of this invention is prepared by the following method: the base oil, rust-preventive additive, film-forming agent and ethylene oxide-propylene oxide block copolymer are mixed according to the formula, and the mixture is stirred and heated while maintaining the temperature at 60°C until it becomes clear. Finally, solvent oil is added and stirred until the oil is clear and transparent.

[0011] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: The present invention introduces ethylene oxide-propylene oxide block copolymer into the rust-preventive oil system. The ethylene oxide-propylene oxide block copolymer, in combination with a film-forming agent composed of oxidized wax, oxidized wax ester and oxidized wax calcium soap in a specific ratio, can, on the one hand, make the oil clear and free from precipitation at low temperatures, and has good low-temperature stability; on the other hand, it can make the rust-preventive film formed on the surface of metal workpieces dense and firm, thereby greatly improving the salt spray resistance of the rust-preventive oil, and can be applied in scenarios such as marine transportation that require high salt spray resistance. Detailed Implementation

[0012] Example 1

[0013] The rust-preventive oil of the present invention is composed of the following components in parts by weight: 3 parts barium petroleum sulfonate, 2 parts neutral dinonylnaphthalene sulfonate calcium, 2 parts oxidized wax ester, 0.5 parts oxidized wax, 1 part oxidized wax calcium soap, 3.5 parts dodecenyl succinic acid, 0.2 parts phenolic antioxidant, 0.2 parts ethylene oxide-propylene oxide block copolymer, 30 parts naphthenic base oil, 0.2 parts N-oleoylsarcosine-octadecylamine salt, and 57.4 parts aromatic hydrocarbon solvent oil.

[0014] Example 2

[0015] The rust-preventive oil of this invention is composed of the following components in parts by weight: 3 parts barium petroleum sulfonate, 2 parts neutral dinonylnaphthalene sulfonate calcium, 2 parts oxidized wax ester, 3 parts oxidized wax, 1 part oxidized wax calcium soap, 3.5 parts dodecenyl succinic acid, 0.2 parts phenolic antioxidant, 0.2 parts ethylene oxide-propylene oxide block copolymer, 30 parts naphthenic base oil, 0.2 parts N-oleoylsarcosine-octadecylamine salt, and 54.9 parts aromatic hydrocarbon solvent oil.

[0016] Example 3

[0017] The rust-preventive oil of the present invention is composed of the following components in parts by weight: 3 parts barium petroleum sulfonate, 2 parts neutral dinonylnaphthalene sulfonate calcium, 2 parts oxidized wax ester, 2 parts oxidized wax, 1 part oxidized wax calcium soap, 3.5 parts dodecenyl succinic acid, 0.2 parts phenolic antioxidant, 0.2 parts ethylene oxide-propylene oxide block copolymer, 30 parts naphthenic base oil, 0.2 parts N-oleoylsarcosine-octadecylamine salt, and 55.9 parts aromatic hydrocarbon solvent oil.

[0018] Comparative Example 1

[0019] A rust-preventive oil comprises the following components in parts by weight: 3 parts barium petroleum sulfonate, 2 parts neutral dinonylnaphthalene sulfonate calcium, 2 parts oxidized wax ester, 3 parts oxidized wax, 3.5 parts dodecenyl succinic acid, 0.2 parts phenolic antioxidant, 0.2 parts ethylene oxide-propylene oxide block copolymer, 30 parts naphthenic base oil, 0.2 parts N-oleoylsarcosine-octadecylamine salt, and 55.9 parts aromatic hydrocarbon solvent oil.

[0020] Comparative Example 2

[0021] A rust-preventive oil comprises the following components in parts by weight: 3 parts barium petroleum sulfonate, 2 parts neutral dinonylnaphthalene sulfonate calcium, 2 parts oxidized wax ester, 3 parts oxidized wax, 3.5 parts dodecenyl succinic acid, 0.2 parts phenolic antioxidant, 30 parts naphthenic base oil, 0.2 parts N-oleoylsarcosine-octadecylamine salt, and 56.9 parts aromatic hydrocarbon solvent oil.

[0022] Comparative Example 3

[0023] A rust-preventive oil comprises the following components in parts by weight: 3 parts barium petroleum sulfonate, 2 parts neutral dinonylnaphthalene sulfonate calcium, 2 parts oxidized wax ester, 0.5 parts oxidized wax, 1 part oxidized wax calcium soap, 3.5 parts dodecenyl succinic acid, 0.2 parts phenolic antioxidant, 30 parts naphthenic base oil, 0.2 parts N-oleoylsarcosine-octadecylamine salt, and 57.6 parts aromatic hydrocarbon solvent oil.

[0024] Table 1 shows the performance test results of the rust-preventive oils in Examples 1-3 and Comparative Examples 1-3:

[0025]

[0026] As shown in Table 1, the rust-preventive oil of Example 1 exhibits good salt spray resistance and low-temperature stability, with a salt spray time of up to 104 hours. By introducing an ethylene oxide-propylene oxide block copolymer into the rust-preventive oil system, and combining it with a film-forming agent composed of a specific ratio of oxidized wax, oxidized wax ester, and oxidized wax calcium soap (0.5:2:1), the oil can remain clear and free of precipitation at low temperatures, demonstrating excellent low-temperature stability. Furthermore, it can create a dense and robust rust-preventive film on the surface of the metal workpiece, thereby significantly improving the salt spray resistance of the rust-preventive oil.

Claims

1. A rust preventive oil having high salt mist resistance, characterized by comprising: Consists of 3 parts of barium petroleum sulfonate, 2 parts of calcium neutral dinonylnaphthalene sulfonate, 2 parts of oxidized wax ester, 0.5 parts of oxidized wax, 1 part of calcium oxidized wax soap, 3.5 parts of dodecenyl succinic acid, 0.2 parts of phenolic antioxidant, 0.2 parts of ethylene oxide-propylene oxide block copolymer, 30 parts of naphthenic base oil, 0.2 parts of N-oleoyl sarcosine-octadecylamine salt, and 57.4 parts of aromatic hydrocarbon solvent oil.

Images