Long-acting anti-rust protective grease for railway fasteners and preparation method of long-acting anti-rust protective grease

Abstract

The invention relates to a manufacturing method of lubricating grease, and discloses long-acting antirust protective grease for railway fasteners and a preparation method thereof, the long-acting antirust protective grease comprises the following raw materials in proportion: 35-60% of base oil accounting for the total mass of the lubricating grease, 30-60% of ultra-high base number calcium sulfonate, 1-4% of n-butyl alcohol accounting for the mass of the ultra-high base number calcium sulfonate, and 1-4% of glacial acetic acid accounting for the mass of the ultra-high base number calcium sulfonate. The lubricating grease comprises the following components in percentage by mass: 0-5% of C12-C24 aliphatic carboxylic acid, 0-5% of boric acid, 0-5% of calcium hydroxide and 0-5% of functional additive. The high-viscosity base oil which is relatively low in price and easy to obtain and a special thickening agent system are used, so that the retention capability and the water washing resistance of the lubricating grease on a metal surface are effectively improved, and meanwhile, the lubricating grease has good outdoor environment resistance and wear resistance; the protection performance of the road buckle assembly can be effectively reduced, the friction performance under the micro-motion condition is reduced, the lubrication and protection service life is greatly prolonged, and the maintenance cost and the risk of operation faults are reduced.

Description

Technical Field

[0001] The invention relates to a method for preparing lubricating grease, in particular to a long-acting rust-proof protective grease for railway fasteners and a preparation method thereof. Background Art

[0002] In the process of modern industrial production, harsh working conditions such as high and low temperature, water vapor and heavy load often occur, which puts higher requirements on the lubrication, sealing and protection performance of grease. Grease is mainly composed of three parts: base oil, thickener and additives. It is solid or semi-fluid at room temperature, and the base oil is enveloped by the spatial network structure formed by the thickener. Especially in terms of bearing capacity, sealing, corrosion resistance and semi-permanent lubricity, grease is better than general lubricants, and the base oil in the grease is not easy to dialysis when in contact with the machine because it is enveloped by the thickener. In the process of mechanical devices working, grease has a series of functions such as reducing wear, reducing friction, and preventing parts from corrosion during downtime, which can greatly reduce the possibility of machine failure and enhance the reliability and durability of mechanical parts. The performance of grease has a certain impact on the actual service life of mechanical parts, so it is very important to choose a grease with excellent performance for daily maintenance of equipment.

[0003] The same is true in the field of rail transportation. As an important part of the track, rail fasteners and other accessories play a vital role in the operation of rail vehicles. However, due to their harsh working conditions, they are exposed to the atmosphere for a long time, and are exposed to the sun, rain, wind, and snow all year round. At the same time, due to the dynamic effect of the train and the erosion of acid, alkali, salt, and water, it is easy to cause oxidation and chemical and electrochemical corrosion of railway accessories, resulting in adverse consequences such as rusting, failure, and fastening failure of accessories. Therefore, it is necessary to frequently carry out protective maintenance on rail fasteners.

[0004] The inventors found that there are at least the following problems in the prior art that have not been solved: 1. The operation process is complicated and pollutes the environment; 2. Grease is lost (especially in the hot summer climate and when it is washed by rain), and there is no grease adhesion after one year of use; 3. The spikes are rusted and difficult to disassemble; 4. The spikes are broken; 5. The nylon sleeve is damaged; 6. It is impossible to isolate the water vapor in the air and the penetration of O2, SO2, H2S, Cl2, salt spray and dust in the atmosphere, and the protection period is short (usually only 3 months). The above situation will directly affect the line maintenance and repair work, endangering the driving safety, and it is difficult to adapt to the development of the railway transportation industry and the needs of locomotive speed increase. This series of problems should be given enough attention. To this end, the present invention designs a long-term anti-rust protective grease for railway fasteners and a preparation method. Summary of the invention

[0005] The purpose of the present invention is to provide a long-lasting protective grease for railways, which can stabilize and prevent rust on fasteners, and at the same time has good wear resistance, temperature resistance and water resistance, and can effectively extend the grease replacement cycle (more than six months) to achieve good protection purposes.

[0006] To achieve the above object, the present invention provides the following technical solution: a long-lasting anti-rust protective grease for railway fasteners, the raw materials are composed in proportion:

[0007] Base oil accounting for 35-60% of the total mass of the grease, and super-overbased calcium sulfonate accounting for 30%-60%;

[0008] 1-4% n-butanol and 1-4% glacial acetic acid, based on the mass of super-overbased calcium sulfonate;

[0009] 0-5% of the total mass of grease 12 -C 24 Fatty carboxylic acid, 0%-5% boric acid, 0%-5% calcium hydroxide;

[0010] Functional additives accounting for 0-5% of the total mass of grease.

[0011] Preferably, the base oil is mineral oil, synthetic oil or a mixture of the two, and its kinematic viscosity at 100°C is 30-90 mm 2 / s, preferably with a kinematic viscosity of 30-60 mm 2 / s.

[0012] Preferably, the super high base calcium sulfonate is petroleum calcium sulfonate or synthetic calcium sulfonate with a base value of 260-430 mgKOH / g, preferably petroleum calcium sulfonate with a base value of 300-360 mgKOH / g.

[0013] Preferably, the C 12 -C 24 The fatty carboxylic acid is 12-hydroxystearic acid.

[0014] Preferably, the functional additive is one or a mixture of the antioxidant diphenylamine and 2,6-di-tert-butyl-p-cresol.

[0015] A method for preparing a long-lasting anti-rust protective grease for railway fasteners, the preparation method comprising the following steps:

[0016] S1. Add 30%-40% of the base oil, basic calcium sulfonate and deionized water, which account for 30% to 40% of the total mass of the grease, into a normal pressure reactor and stir and mix for 30 minutes;

[0017] S2, add glacial acetic acid and n-butanol diluted with deionized water, heat the reactor to 90°C and react for 3 hours; until the infrared spectrum shows 881-886cm -1 Characteristic absorption peak;

[0018] S3, add calcium hydroxide, boric acid and C 12 -C 24 Fatty carboxylic acid, stir and react for 30 minutes, add the remaining amount of base oil, heat to 96℃ and react for 2 hours;

[0019] S4, the reactor is heated to 130°C for dehydration for 1 hour, and then high-temperature refining is carried out at 160°C for 10 minutes;

[0020] S5. The temperature of the reactor is lowered to 80°C and functional additives are added. After the temperature is lowered to 60°C, the reaction product is ground and homogenized to obtain a finished grease.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention effectively improves the retention ability of grease on the metal surface and the water erosion resistance by using relatively cheap and readily available high-viscosity base oil and a special thickener system, while having good outdoor environment resistance and wear resistance, and can effectively reduce the protective performance of the buckle assembly and reduce the friction performance under micro-motion conditions, greatly extending the lubrication and protection life, and reducing maintenance costs and the risk of operational failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a physical and chemical performance diagram of the embodiments of the present invention and the comparative examples;

[0023] Figure 2 The friction coefficient and wear spot diameter diagram of Example 3 of the present invention;

[0024] Figure 3 This is an outdoor coating diagram of the present invention. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1-Figure 3 The present invention provides a technical solution: a long-lasting anti-rust protective grease for railway fasteners, the raw materials are composed in proportion:

[0027] Base oil accounting for 35-60% of the total mass of the grease, and super-overbased calcium sulfonate accounting for 30%-60%;

[0028] 1-4% n-butanol and 1-4% glacial acetic acid, based on the mass of super-overbased calcium sulfonate;

[0029] 0-5% of the total mass of grease 12-C 24 Fatty carboxylic acid, 0%-5% boric acid, 0%-5% calcium hydroxide;

[0030] Functional additives accounting for 0-5% of the total mass of grease.

[0031] Embodiment 1:

[0032] 300g of high base calcium sulfonate, 124g of oil extraction base oil and 30g of deionized water were added to a 1L reactor and stirred for 30 minutes. A mixed solution of 6g of glacial acetic acid and 6g of n-butanol (diluted with 12g of deionized water) was added. The reactor was heated to 90°C for 2 hours. During this period, samples were taken for Fourier transform infrared spectroscopy detection until 881-886cm -1 The characteristic absorption peak does not change. The reactor is heated to 130°C for dehydration for 2 hours, then the temperature is lowered to 80°C, 4.7 g of diphenylamine antioxidant is added, and the reactor is further cooled to 60°C after 1 hour. The reaction product is ground and homogenized to obtain the finished grease.

[0033] Embodiment 2:

[0034] The difference from the first embodiment is that:

[0035] 300g of high base calcium sulfonate, 124g of 150BS base oil and 30g of deionized water were added to a 1L reactor and stirred for 30 minutes. A mixed solution of 6g of glacial acetic acid and 6g of n-butanol (diluted with 12g of deionized water) was added. The reactor was heated to 90°C for 2 hours. During this period, samples were taken for Fourier transform infrared spectroscopy detection until 881-886cm -1 The characteristic absorption peak does not change. The reactor is heated to 130°C for dehydration for 2 hours, then the temperature is lowered to 80°C, 4.7 g of diphenylamine antioxidant is added, and the reactor is further cooled to 60°C after 1 hour. The reaction product is ground and homogenized to obtain the finished grease.

[0036] Embodiment three:

[0037] The difference between the first embodiment and the second embodiment is that:

[0038] 300g of high base calcium sulfonate, 124g of extracted oil base oil and 30g of deionized water were added to a 1L reactor and stirred for 30 minutes. A mixed solution of 6g of glacial acetic acid and 6g of n-butanol (diluted with 12g of deionized water) was added. The reactor was heated to 90°C for 2 hours. During this period, samples were taken for Fourier transform infrared spectroscopy detection until 881-886cm -1The characteristic absorption peak no longer changes. Slowly add 13.8g of calcium hydroxide) and mix for 10 minutes, slowly add 14.7g of boric acid and 26.8g of 12-hydroxystearic acid. After 30 minutes, 56g of base oil was heated to 96°C for reaction for 2 hours. Continue to heat to 130°C for dehydration for 2 hours, and refine at 165°C for 10 minutes. The temperature of the reactor was reduced to 80°C, and 6.5g of diphenylamine antioxidant was added. After 1 hour, the reactor continued to cool to 60°C. The reaction product was ground and homogenized to obtain the finished grease, the friction coefficient and wear spot diameter of Example 3 (average friction coefficient: 0.103, wear spot diameter 0.459).

[0039] Embodiment 4:

[0040] The difference between the first embodiment, the second embodiment and the third embodiment is that:

[0041] 300g of high base calcium sulfonate, 124g of extracted oil base oil and 30g of deionized water were added to a 1L reactor and stirred for 30 minutes. A mixed solution of 6g of glacial acetic acid and 6g of n-butanol (diluted with 12g of deionized water) was added. The reactor was heated to 90°C for 2 hours. During this period, samples were taken for Fourier transform infrared spectroscopy detection until 881-886cm -1 The characteristic absorption peak does not change. Slowly add 13.8g of calcium hydroxide) and mix for 10 minutes, then slowly add 14.7g of boric acid and 26.8g of 12-hydroxystearic acid. After 30 minutes, add 56g of base oil, heat to 96°C and react for 2 hours. Continue to heat to 130°C for dehydration for 2 hours, and refine at 165°C for 10 minutes. The temperature of the reactor is reduced to 80°C, 6.5g of diphenylamine antioxidant is added, and the reactor is further cooled to 60°C after 1 hour. The reaction product is ground and homogenized to obtain the finished grease.

[0042] In summary: By reference ( Figure 1 , Figure 2 , Figure 3 ) By comparing Example 1, Example 2, Example 3 with Example 4, it can be concluded that the present invention proposes a long-lasting rust-proof protective grease for railway fasteners and a preparation method, which effectively improves the retention ability and water erosion resistance of the grease on the metal surface by using relatively cheap and readily available high-viscosity base oil and a special thickener system, while having good outdoor environment resistance and wear resistance, and can effectively reduce the protective performance of the buckle assembly and reduce the friction performance under micro-motion conditions, greatly extending the lubrication and protection life, and reducing maintenance costs and the risk of operational failures.

[0043] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, technique, article or equipment including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, technique, article or equipment.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A long-lasting anti-rust protective grease for railway fasteners, Features: Raw materials are composed in proportion: Base oil accounting for 35-60% of the total mass of the grease, and super-overbased calcium sulfonate accounting for 30%-60%; 1-4% n-butanol and 1-4% glacial acetic acid, based on the mass of super-overbased calcium sulfonate; 0-5% of the total mass of grease 12 -C 24 Fatty carboxylic acid, 0%-5% boric acid, 0%-5% calcium hydroxide; Functional additives accounting for 0-5% of the total mass of grease.

2. A long-lasting anti-rust protective grease for railway fasteners according to claim 1, Features: The base oil is mineral oil, synthetic oil or a mixture of the two, and its kinematic viscosity at 100°C is 30-90 mm 2 / s, preferably with a kinematic viscosity of 30-60 mm 2 / s.

3. A long-lasting anti-rust protective grease for railway fasteners according to claim 1, Features: The super high base calcium sulfonate is petroleum calcium sulfonate or synthetic calcium sulfonate with a base value of 260-430 mgKOH / g, preferably petroleum calcium sulfonate with a base value of 300-360 mgKOH / g.

4. A long-lasting anti-rust protective grease for railway fasteners according to claim 1, Features: The C 12 -C 24 The fatty carboxylic acid is 12-hydroxystearic acid.

5. The long-lasting anti-rust protective grease for railway fasteners according to claim 1, Features: The functional additive is one of the antioxidants diphenylamine and 2,6-di-tert-butyl-p-cresol or a mixture thereof.

6. A method for preparing a long-lasting anti-rust protective grease for railway fasteners, Features: The preparation method comprises the following steps: S1. Add 30%-40% of the base oil, basic calcium sulfonate and deionized water, which account for 30% to 40% of the total mass of the grease, into a normal pressure reactor and stir and mix for 30 minutes; S2, add glacial acetic acid and n-butanol diluted with deionized water, heat the reactor to 90°C and react for 3 hours; until the infrared spectrum shows 881-886cm -1 Characteristic absorption peak; S3, add calcium hydroxide, boric acid and C 12 -C 24 Fatty carboxylic acid, stir and react for 30 minutes, add the remaining amount of base oil, heat to 96℃ and react for 2 hours; S4, the reactor is heated to 130°C for dehydration for 1 hour, and then high-temperature refining is carried out at 160°C for 10 minutes; S5. The temperature of the reactor is lowered to 80°C and functional additives are added. After the temperature is lowered to 60°C, the reaction product is ground and homogenized to obtain a finished grease.

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