Chlorine-free long-life rust-resistant carbon steel pipe rolling oil and method for preparing the same

Abstract

The present application relates to the field of metal rolling oil, especially to a chlorine-free long-antirust carbon steel pipe rolling oil and a preparation method thereof. The rolling oil comprises the following components: base oil 40-60 parts, lubricant 10-20 parts, antirust agent 5-10 parts, antioxidant 0.1-1 part, settling agent 1-3 parts, synthetic ester 15-25 parts, and refined vegetable oil 15-25 parts. The present application uses a sulfur-based lubricant to replace chlorinated paraffin, avoids the rusting problem caused by the residue of chlorine element and acidic decomposition products, and is more environmentally friendly and safe. The antirust agent is compounded to effectively isolate moisture and air, significantly prolonging the antirust period. The synergistic effect of the synthetic ester and the refined vegetable oil forms a high-strength oil film at high temperatures. The settling agent adsorbs metal particles to promote sedimentation, and the antioxidant inhibits the oxidation of the oil product, prolonging the service life. The present application is suitable for high-speed rolling, improves the surface gloss of the product, prevents roll sticking, prolongs the service life of the mold, and improves the processing efficiency and deformation.

Description

Technical Field

[0001] This invention relates to the field of pipe rolling oil, and in particular to chlorine-free long rust-preventive carbon steel pipe rolling oil and its preparation method. Background Technology

[0002] Carbon steel pipe rolling is a processing method that uses rotating rolls to apply pressure to the pipe under certain conditions, causing plastic deformation. The rolling process for carbon steel pipes is quite demanding, requiring rolling oil with good cooling and lubrication properties, anti-wear properties, oxidation stability, and degreasing properties. This reduces external friction between the rolled metal and the rolls, thereby reducing roll wear, lowering total rolling pressure and energy consumption, increasing the reduction rate per pass, reducing the number of rolling passes, and increasing rolling speed. In recent years, in particular, with the advancement of rolling technology, high-speed rolling and mass production have been achieved, placing even higher demands on rolling oil, requiring further improvements in its lubricity and emulsification stability during repeated use.

[0003] Currently, most rolling oils in China can be divided into two types: water-soluble rolling oils and pure oil-based rolling oils. Oil-based rolling oils account for over 95% of the market. Due to their high lubricity, strong antibacterial properties, and high surface gloss of products made from them, they are the preferred choice in the current rolling oil market because they are water-free, resistant to bacterial growth and deterioration, and have a long service life. However, existing oil-based rolling oils have poor cooling properties, and when processing large volumes, they are prone to roller sticking. Most commonly available rolling oils are made with chlorinated paraffin and a small amount of lubricant. Paraffin easily carbonizes at high temperatures, and these carbon deposits are difficult to clean. Incompletely cleaned products will exhibit carburization and chlorine residue problems during subsequent high-temperature annealing, affecting product quality. Furthermore, chlorinated paraffin easily decomposes at certain temperatures, producing highly acidic decomposition products. If the rolled material is not cleaned promptly, it is prone to rusting under acidic conditions.

[0004] Although the stainless steel pipe rolling oil disclosed in application number 201610556413.7 improves performance by compounding antioxidants and extreme pressure agents, its base oil is paraffin-based oil, which still has problems such as high-temperature carbonization, chlorine residue and cleaning.

[0005] Therefore, how to provide a rolling oil with excellent overall performance, good lubricity and stable performance, and safe and environmentally friendly use is a problem that the industry urgently needs to solve. Summary of the Invention

[0006] The technical problem this invention aims to solve is: to address the technical problems described in the background art, this invention provides a chlorine-free long rust-preventive carbon steel pipe rolling oil and its preparation method. By using a sulfur-based lubricant instead of chlorinated paraffin, it avoids rust problems caused by residual chlorine and acidic decomposition products, making it more environmentally friendly and safer.

[0007] By using a compound of rust inhibitors (such as calcium petroleum sulfonate and barium sulfonate), moisture and air are effectively isolated, significantly extending the rust prevention period (30-38 hours in salt spray tests).

[0008] The synergistic effect of synthetic esters and refined vegetable oils forms a high-strength oil film at high temperatures, with a lubricity PB value of 128-135 and an extreme pressure PD value of 800.

[0009] Flocculants (such as isomeric 14-15 alcohols) adsorb metal particles to promote sedimentation, while antioxidants inhibit oil oxidation and extend service life.

[0010] Suitable for high-speed rolling, it enhances the surface gloss of products, prevents roller sticking, extends die life, and improves processing efficiency and deformation.

[0011] The technical solution adopted by this invention to solve its technical problem is: A chlorine-free long rust-proof carbon steel pipe rolling oil comprises the following components: 40-60 parts base oil, 10-20 parts lubricant, 5-10 parts rust inhibitor, 0.1-1 parts antioxidant, 1-3 parts settling agent, 15-25 parts synthetic ester, and 15-25 parts refined vegetable oil.

[0012] Specifically, the base oil is one or more of the following: 32# national standard oil, 100# machine oil, or 150BS.

[0013] Specifically, the lubricant is one or more of sulfurized olefins, sulfurized fatty acid esters, sulfurized cottonseed oil, and sulfurized sodium fatty acids.

[0014] Specifically, the rust inhibitor is one or more of the following: calcium petroleum sulfonate, barium sulfonate, dodecenyl succinic acid, lauric acid, and tetrameric ricinoleic acid.

[0015] Specifically, the antioxidant is one or more of 2,6-tert-butyl-4-methylphenol, bis(3,5-tert-butyl-4-hydroxyphenyl sulfide), dithiodipropionate diester, and octyl diphenylamine.

[0016] Specifically, the settling agent is at least one of isomeric 14-15 alcohol and C-1415 primary alcohol.

[0017] Specifically, the synthetic ester is one or more of trimethylolpropane oleate, pentaerythritol oleate, isooctyl oleate, methyl oleate, and butyl stearate.

[0018] Specifically, the refined vegetable oil is one or more of refined rapeseed oil, oxidized rapeseed oil, palm oil, cottonseed oil, and castor oil.

[0019] A method for preparing a chlorine-free, rust-resistant, long carbon steel pipe rolling oil is characterized by the following steps: mixing the components according to the specified ratio, stirring at 20-40°C for 20-30 minutes, stopping the heating and continuing to stir for 10-15 minutes to obtain the rolling oil.

[0020] The beneficial effects of this invention are: This invention provides a chlorine-free rolling oil for long rust-preventive carbon steel pipes and its preparation method. By using a sulfur-based lubricant instead of chlorinated paraffin, it avoids rust problems caused by residual chlorine and acidic decomposition products, making it more environmentally friendly and safer.

[0021] By using a compound of rust inhibitors (such as calcium petroleum sulfonate and barium sulfonate), moisture and air are effectively isolated, significantly extending the rust prevention period (30-38 hours in salt spray tests).

[0022] The synergistic effect of synthetic esters and refined vegetable oils forms a high-strength oil film at high temperatures, with a lubricity PB value of 128-135 and an extreme pressure PD value of 800.

[0023] Flocculants (such as isomeric 14-15 alcohols) adsorb metal particles to promote sedimentation, while antioxidants inhibit oil oxidation and extend service life.

[0024] Suitable for high-speed rolling, it enhances the surface gloss of products, prevents roller sticking, extends die life, and improves processing efficiency and deformation. Detailed Implementation

[0025] A chlorine-free long rust-proof carbon steel pipe rolling oil comprises the following components: 40-60 parts base oil, 10-20 parts lubricant, 5-10 parts rust inhibitor, 0.1-1 parts antioxidant, 1-3 parts settling agent, 15-25 parts synthetic ester, and 15-25 parts refined vegetable oil.

[0026] The base oil is one or more of the following: 32# national standard oil, 100# machine oil, or 150BS.

[0027] The lubricant is one or more of sulfurized olefins, sulfurized fatty acid esters, sulfurized cottonseed oil, and sulfurized sodium fatty acids.

[0028] The rust inhibitor is one or more of the following: calcium petroleum sulfonate, barium sulfonate, dodecenyl succinic acid, lauric acid, and tetrameric ricinoleic acid.

[0029] The antioxidant is one or more of 2,6-tert-butyl-4-methylphenol, bis(3,5-tert-butyl-4-hydroxyphenyl sulfide), dithiodipropionate diester, and octyl diphenylamine.

[0030] The settling agent is at least one of isomeric 14-15 alcohol and C-1415 primary alcohol.

[0031] The synthetic ester is one or more of the following: trimethylolpropane oleate, pentaerythritol oleate, isooctyl oleate, methyl oleate, and butyl stearate.

[0032] Refined vegetable oil is one or more of the following: refined rapeseed oil, oxidized rapeseed oil, palm oil, cottonseed oil, and castor oil.

[0033] A method for preparing a chlorine-free, rust-resistant, long carbon steel pipe rolling oil is characterized by the following steps: mixing the components according to the specified ratio, stirring at 20-40°C for 20-30 minutes, stopping the heating and continuing to stir for 10-15 minutes to obtain the rolling oil. Example

[0034] Formula (parts by weight): Base oil (32# national standard oil) 40 parts, lubricant (sulfurized olefins) 20 parts, rust inhibitor (petroleum sulfonate calcium) 10 parts, antioxidant (2,6-tri-butyl-4-methylphenol) 0.1 parts, settling agent (isomeric 14-15 alcohol) 1 part, synthetic ester (trimethylolpropane oleate) 15 parts, refined vegetable oil (refined rapeseed oil) 15 parts.

[0035] Preparation: Stir at 20°C for 20 minutes, then stop heating and continue stirring for 10 minutes. Example

[0036] Formula: 45 parts base oil (100# machine oil), 18 parts lubricant (sulfurized fatty acid ester), 8 parts rust inhibitor (barium sulfonate), 0.3 parts antioxidant (bis(3,5-tri-butyl-4-hydroxyphenyl sulfide), 1.5 parts settling agent (C-1415 primary alcohol), 20 parts synthetic ester (pentaerythritol oleate), and 18 parts refined vegetable oil (oxidized rapeseed oil).

[0037] Preparation: Same as in Example 1. Example

[0038] Formula: 50 parts base oil (150BS), 20 parts lubricant (sulfurized cottonseed oil), 7 parts rust inhibitor (dodecenyl succinic acid), 0.6 parts antioxidant (thiodipropionate diester), 2 parts settling agent (isomeric 14-15 alcohol), 23 parts synthetic ester (isooctyl oleate), and 23 parts refined vegetable oil (palm oil).

[0039] Preparation: Same as in Example 1. Example

[0040] Formula: 55 parts base oil (a mixture of 32# national standard oil, 100# machine oil, and 150BS in a mass ratio of 1:2:3), 16 parts lubricant (a mixture of sulfurized olefins, sulfurized fatty acid esters, sulfurized cottonseed oil, and sulfurized sodium fatty acid in a mass ratio of 1:2:3:2), 8 parts rust inhibitor (a mixture of calcium petroleum sulfonate, barium sulfonate, dodecenyl succinic acid, lauric acid, and tetrameric ricinoleic acid in a mass ratio of 1:3:2:2:1), and 8 parts antioxidant (2,6-tri-butyl-4-methylphenol and bis(3,5-tri-butyl-4-hydroxyphenyl sulfide). 0.8 parts of a mixture of dithiodipropionate diester and octyl diphenylamine in a mass ratio of 1:3:5:2; 2.5 parts of a settling agent (a mixture of isomeric 14-15 alcohol and C-1415 primary alcohol in a mass ratio of 3:5); 23 parts of a synthetic ester (a mixture of trimethylolpropane oleate, pentaerythritol oleate, isooctyl oleate, methyl oleate, and butyl stearate in a mass ratio of 2:4:3:1:2); and 22 parts of refined vegetable oil (a mixture of refined rapeseed oil, oxidized rapeseed oil, palm oil, cottonseed oil, and castor oil in a mass ratio of 1:2:3:3:5).

[0041] Preparation: Same as in Example 1. Example

[0042] Formula: 60 parts base oil (32# national standard oil), 20 parts lubricant (sodium sulfide fatty acid), 5 parts rust inhibitor (tetrameric ricinoleic acid), 1 part antioxidant (octyl diphenylamine), 3 parts settling agent (C-1415 primary alcohol), 25 parts synthetic ester (butyl stearate), and 25 parts refined vegetable oil (cottonseed oil).

[0043] Preparation: Same as in Example 1.

[0044] Comparative Example 1 The formulation and preparation method of Comparative Example 1 are basically the same as those of Example 1, except that no refined vegetable oil is added.

[0045] Comparative Example 2 The formulation and preparation method of Comparative Example 2 are basically the same as those of Example 1, except that no synthetic ester is added.

[0046] Comparative Example 3 The formulation and preparation method of Comparative Example 3 are basically the same as those of Example 1, except that no settling agent is added.

[0047] Comparative Example 4 The formulation and preparation method of Comparative Example 4 are basically the same as those of Example 1, except that no lubricant was added.

[0048] Comparative Example 5 The formulation and preparation method of Comparative Example 5 are basically the same as those of Example 1, except that the amount of refined vegetable oil added is 12 parts.

[0049] Comparative Example 6 The formulation and preparation method of Comparative Example 6 are basically the same as those of Example 1, except that the amount of synthetic ester added is 11 parts.

[0050] Comparative Example 7 The formulation and preparation method of Comparative Example 7 are basically the same as those of Example 1, except that the amount of lubricant added is 8 parts.

[0051] To further illustrate the beneficial technical effects of the chlorine-free long rust-proof carbon steel pipe rolling oil disclosed in the embodiments of the present invention, the performance of the chlorine-free long rust-proof carbon steel pipe rolling oil described in Examples 1-5 and Comparative Examples 1-7 was tested. The test methods and test results are shown in Table 1.

[0052] Table 1. Test results of rolling oil performance for chlorine-free long rust-proof carbon steel pipes Testing items Viscosity at 40℃ Salt spray test Flash point Lubricating PB Extreme pressure PD Test Standards GB / T265 Sh / t0081 GB / T3536 GB / T3142 GB / T3142 Example 1 52 34H 208 135 800 Example 2 86 34H 220 135 800 Example 3 163 38H 231 135 800 Example 4 108 32H 216 128 800 Example 5 49 30H 206 128 800 Comparative Example 1 50 34H 206 114 800 Comparative Example 2 54 34H 200 114 800 Comparative Example 3 54 25H 204 121 800 Comparative Example 4 52 34H 208 76 315 Comparative Example 5 53 26H 206 128 800 Comparative Example 6 52 34H 204 128 620 Comparative Example 7 50 34H 208 121 620 As can be seen from Table 1, the chlorinated carbon steel pipe rolling oil disclosed in the embodiments of the present invention has excellent comprehensive performance, which is the result of the synergistic effect of each component.

[0053] By comparing experimental data with the absence of key components (such as Comparative Examples 1-4) or the reduction of their dosage (Comparative Examples 5-7), the necessity of the synergistic effect of each component on performance is demonstrated (e.g., the PD value drops to 315 without lubricant, and the rust prevention decreases without flocculant).

[0054] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A chlorine-free rolling oil for long rust-proof carbon steel pipes, characterized in that, It contains the following components: 40-60 parts base oil, 10-20 parts lubricant, 5-10 parts rust inhibitor, 0.1-1 part antioxidant, 1-3 parts settling agent, 15-25 parts synthetic ester, and 15-25 parts refined vegetable oil.

2. The chlorine-free long rust-proof carbon steel pipe rolling oil according to claim 1, characterized in that: The base oil is one or more of the following: 32# national standard oil, 100# machine oil, or 150BS.

3. The chlorine-free long rust-proof carbon steel pipe rolling oil according to claim 1, characterized in that: The lubricant is one or more of sulfurized olefins, sulfurized fatty acid esters, sulfurized cottonseed oil, and sulfurized sodium fatty acids.

4. The chlorine-free long rust-proof carbon steel pipe rolling oil according to claim 1, characterized in that: The rust inhibitor is one or more of the following: calcium petroleum sulfonate, barium sulfonate, dodecenyl succinic acid, lauric acid, and tetrameric ricinoleic acid.

5. The chlorine-free long rust-proof carbon steel pipe rolling oil according to claim 1, characterized in that: The antioxidant is one or more of 2,6-tert-butyl-4-methylphenol, bis(3,5-tert-butyl-4-hydroxyphenyl sulfide), dithiodipropionate diester, and octyl diphenylamine.

6. The chlorine-free long rust-proof carbon steel pipe rolling oil according to claim 1, characterized in that: The settling agent is at least one of isomeric 14-15 alcohol and C-1415 primary alcohol.

7. The chlorine-free long rust-proof carbon steel pipe rolling oil according to claim 1, characterized in that: The synthetic ester is one or more of trimethylolpropane oleate, pentaerythritol oleate, isooctyl oleate, methyl oleate, and butyl stearate.

8. The chlorine-free long rust-proof carbon steel pipe rolling oil according to claim 1, characterized in that: The refined vegetable oil is one or more of refined rapeseed oil, oxidized rapeseed oil, palm oil, cottonseed oil, and castor oil.

9. A method for preparing a chlorine-free long rust-preventive carbon steel pipe rolling oil as described in any one of claims 1-8, characterized in that, The process includes the following steps: mixing the components according to the specified ratio, stirring at 20-40℃ for 20-30 minutes, stopping the heating and continuing to stir for 10-15 minutes to obtain the rolling oil.