Anti-friction agent for steel rail and preparation method of anti-friction agent

Abstract

The invention discloses an antifriction agent for a steel rail and a preparation method thereof, the steel rail antifriction agent provided by the scheme abandons an original form taking base oil as a main body and replaces a form taking lubricating grease (the lubricating grease is between 0 # and 000 #) as a main body, and various additives are added, so that various requirements in use of the steel rail are met. On the basis of composite calcium sulfonate lubricating grease, molybdenum disulfide, oxidized paraffin, a tackifier, an antioxidant, an anti-rust agent, an anti-wear reagent at extreme pressure and the like are added, so that the anti-friction agent with excellent anti-wear property at extreme pressure, adhesion, oxidation and rust resistance and stability is obtained, and the problems of friction and abrasion in the running process of a steel rail are well solved.

Description

Technical Field

[0001] The invention belongs to the technical field of antifriction agents, and in particular relates to an antifriction agent for rails and a preparation method thereof. Background Art

[0002] In railway transportation, the friction between rails and wheels is an important issue. Excessive friction will not only increase energy consumption, but also lead to increased wear of rails and wheels, shorten their service life and increase maintenance costs. Traditional anti-friction agents can reduce friction to a certain extent, but they often have problems such as unstable performance, poor durability, weak adhesion, insufficient extreme pressure and wear resistance, and poor anti-corrosion, rust and oxidation resistance. Therefore, it is necessary to develop a high-performance anti-friction agent specifically for rails to solve these problems.

[0003] Because the required consistency of antifriction agent for rail should not be too high, otherwise it will bring great inconvenience to use and fail to achieve the desired effect. Therefore, most antifriction agents currently used in the market are made of base oil plus various additives, and some low-end products simply use base oil instead. This type of antifriction agent has low cost and is easy to use, but in terms of effect, it has low adhesion rate and poor extreme pressure and anti-wear effect, and cannot fully meet the needs of rail antifriction, thus causing a series of problems.

[0004] The rail wear reducer provided in this solution abandons the original form of base oil as the main body, and replaces it with grease (the grease is between 0#-000#) as the main body. By adding various additives, it meets various needs in the use of rails. Summary of the invention

[0005] In order to overcome the problems existing in the prior art, the present invention prepares a friction reducer for rails, which is based on composite calcium sulfonate grease, and by adding molybdenum disulfide, oxidized paraffin, tackifier, antioxidant, rust inhibitor, extreme pressure anti-wear agent, etc., a friction reducer with excellent extreme pressure anti-wear, adhesion, anti-oxidation and anti-rust, and stability is obtained, which well solves the friction and wear problems in rail operation. The specific scheme is as follows: The invention provides a friction reducer for rails. The friction reducer is based on composite calcium sulfonate grease. By adding molybdenum disulfide, oxidized paraffin, a tackifier, an antioxidant, a rust inhibitor and an extreme pressure anti-wear agent, a friction reducer with excellent extreme pressure anti-wear, adhesion, anti-oxidation and anti-rust properties and stability is obtained, which solves the friction and wear problems in rail operation.

[0006] Further, in terms of mass percentage, it is made from the following raw materials: Base oil: 65%-80%; thickener: 10%-15%; molybdenum disulfide: 5%-8%; oxidized paraffin: 2%-3%; antioxidant: 1%-2%; viscosity enhancer: 1%-2%; extreme pressure and anti-wear agent: 2%-3%; rust inhibitor: 1%-2%.

[0007] Furthermore, the base oil is one of polyalphaolefin synthetic oil and synthetic ester oil, or a mixture of the two.

[0008] Furthermore, the thickener is prepared by reacting calcium sulfonate, a conversion accelerator, a higher fatty acid and calcium hydroxide. The composite calcium sulfonate grease itself has certain extreme pressure and anti-wear properties, which is better than using a base oil alone. And compared with a liquid anti-friction agent based solely on a base oil, it can better adhere to the rails, play a role in reducing friction, and also avoid pollution to the environment.

[0009] Furthermore, the calcium sulfonate is a high base number calcium sulfonate, and its base number is greater than 380 mgKOH / g; the higher fatty acid is a C12-C24 fatty acid, including dodecanoic acid, hexadecanoic acid, stearic acid or dodecyl stearic acid; the conversion promoter is a mixture of water, glacial acetic acid, ethanol and isopropanol; wherein the mass ratio of water, glacial acetic acid, ethanol and isopropanol is about 3:2:1:1.

[0010] Furthermore, the mass ratios of the components in the thickener are: calcium sulfonate 5%-6%, conversion accelerator 3%-5%, higher fatty acid 1%-2%, and calcium hydroxide 1%-2%.

[0011] Furthermore, the cone penetration of the grease obtained by thickening the base oil with a thickener is between 0# and 000#, and the preferred cone penetration is 00#.

[0012] Furthermore, the oxidized paraffin is selected from one or more of oxidized paraffin 70, oxidized paraffin 80 or oxidized paraffin 731; the antioxidant is one or a mixture of diphenylamine, diisooctyl diphenylamine or thiocarbamate; the tackifier is one or a mixture of polyisobutylene, natural rubber or polymethacrylate; the extreme pressure anti-wear agent is one or a mixture of sulfided isobutylene, phosphate, sulfided olefin and lead cyclopentaneate; the rust inhibitor is one or a mixture of barium dinonylnaphthalene sulfonate, benzotriazole and zinc cyclopentaneate.

[0013] The present invention also provides a method for preparing a wear reducing agent for rails, which is completed by the following steps: (i) Add base oil and calcium sulfonate into a reaction kettle and stir for 30-60 minutes; (ii) raising the temperature to 40°C-60°C, and adding water, glacial acetic acid, ethanol and isopropanol in sequence; (iii) At 70℃-90℃, add higher fatty acids and calcium hydroxide and stir evenly.

[0014] (iv) 95°C-115°C, constant temperature for 1-2 hours; (V) At 160°C-180°C, add molybdenum disulfide and paraffin oxide, stir evenly, keep the temperature constant for 15-30 minutes, and then cool down; The composite calcium sulfonate grease itself has certain extreme pressure and anti-wear properties. In addition, a certain amount of extreme pressure and anti-wear agent and molybdenum disulfide are added. Molybdenum disulfide is dispersible and non-sticky, which can improve the lubricity and extreme pressure properties of the anti-friction agent. It can still maintain the lubricating oil film between the wheel and rail under high-load and high-speed running conditions, thereby reducing friction.

[0015] (VI) Add antioxidant, tackifier, extreme pressure anti-wear agent and rust inhibitor at 80℃-100℃, stir evenly and grind out the grease. Beneficial Effects

[0016] Compared with other similar products, the product obtained by this solution has the following advantages: (1) Excellent extreme pressure and anti-wear performance. The composite calcium sulfonate grease itself has certain extreme pressure and anti-wear performance. In addition, a certain amount of extreme pressure anti-wear agent and molybdenum disulfide are added. Molybdenum disulfide is dispersible and non-adhesive, which can improve the lubricity and extreme pressure of the anti-friction agent. Under high-load and high-speed running conditions, it can still maintain the lubricating oil film between the wheel and the rail, reducing friction. (2) Strong adhesion performance. Calcium sulfonate composite has good adhesion performance. The addition of thickener strengthens its adhesion performance to a certain extent, which can ensure that the anti-friction agent remains on the track surface for a long time and is not easy to fall off.

[0017] (3) Good antioxidant and anti-rust properties. Antioxidants and rust inhibitors can enhance the antioxidant and corrosion resistance of the rail surface, extend the service life of the rail, and reduce economic losses.

[0018] (4) The rail wear reducer obtained by this scheme is mainly composed of grease. Compared with liquid wear reducers mainly composed of base oil, it can adhere to the rail better and achieve the effect of reducing wear, while also avoiding pollution to the environment. DETAILED DESCRIPTION

[0019] The present solution is described in detail with reference to the embodiments. The embodiments are merely further elaborations of the present solution but do not limit the present solution.

[0020] The embodiment of the present invention is a friction reducer for rails. The friction reducer is based on composite calcium sulfonate grease. By adding molybdenum disulfide, oxidized paraffin, a tackifier, an antioxidant, a rust inhibitor, and an extreme pressure anti-wear agent, a friction reducer with excellent extreme pressure anti-wear, adhesion, anti-oxidation and anti-rust properties and stability is obtained, which solves the friction and wear problems during rail operation.

[0021] A wear reducing agent for rails, which is made of the following raw materials in terms of mass percentage: Base oil: 65%-80%; thickener: 10%-15%; molybdenum disulfide: 5%-8%; oxidized paraffin: 2%-3%; antioxidant: 1%-2%; tackifier: 1%-2%; extreme pressure anti-wear agent: 2%-3%; rust inhibitor: 1%-2%. The cone penetration of the grease obtained by thickening the base oil with a thickener is between 0#-000#, and the preferred cone penetration is 00#.

[0022] Among them, the oxidized paraffin is selected from one or more of oxidized paraffin 70, oxidized paraffin 80 or oxidized paraffin 731; the antioxidant is one or a mixture of diphenylamine, diisooctyl diphenylamine or thiocarbamate; the tackifier is one or a mixture of polyisobutylene, natural rubber or polymethacrylate; the extreme pressure anti-wear agent is one or a mixture of sulfided isobutylene, phosphate, sulfided olefin and lead cyclopentaneate; the rust inhibitor is one or a mixture of barium dinonylnaphthalene sulfonate, benzotriazole and zinc cyclopentaneate.

[0023] The base oil is one of polyalphaolefin synthetic oil and synthetic ester oil or a mixture of the two.

[0024] The thickener is prepared by reacting calcium sulfonate, conversion accelerator, higher fatty acid and calcium hydroxide. The mass ratio of each component is: calcium sulfonate 5%-6%; conversion accelerator 3%-5%; higher fatty acid 1%-2%; calcium hydroxide 1%-2%.

[0025] The calcium sulfonate is a high base calcium sulfonate with a base value greater than 380 mgKOH / g; the higher fatty acid is a C12-C24 fatty acid, including dodecanoic acid, hexadecanoic acid, stearic acid or dodecyl stearic acid; the conversion promoter is a mixture of water, glacial acetic acid, ethanol and isopropanol; the mass ratio of water, glacial acetic acid, ethanol and isopropanol is about 3:2:1:1.

[0026] The present invention also provides another embodiment, the preparation method of the above-mentioned antifriction agent for rail is completed by the following steps: (i) Add base oil and calcium sulfonate into a reaction kettle and stir for 30-60 minutes; (ii) raising the temperature to 40°C-60°C, and adding water, glacial acetic acid, ethanol and isopropanol in sequence; (iii) Raise the temperature to 70°C-90°C, add higher fatty acids and calcium hydroxide, and stir evenly; (iv) raising the temperature to 95°C-115°C and maintaining the temperature for 1-2 hours; (V) Raise the temperature to 160-180°C, add molybdenum disulfide and paraffin oxide, stir evenly, keep the temperature constant for 15-30 minutes, and then cool down; (VI) Add antioxidant, tackifier, extreme pressure anti-wear agent and rust inhibitor at 80℃-100℃, stir evenly and grind out the grease.

[0027] Example 1 In this embodiment, 730 grams of synthetic ester oil, 60 grams of high base calcium sulfonate (base value 420 mgKOH / g), 20 grams of water, 15 grams of glacial acetic acid, 8 grams of ethanol, 7 grams of isopropanol, 15 grams of dodecyl stearic acid, 10 grams of calcium hydroxide, 65 grams of molybdenum disulfide, 20 grams of oxidized paraffin 70, 10 grams of diphenylamine, 10 grams of polyisobutylene, 20 grams of sulfided isobutylene, and 10 grams of barium dinonylnaphthalene sulfonate.

[0028] The preparation method is as follows: ① Add base oil and high base calcium sulfonate into the reactor and stir for 60 minutes.

[0029] ② Raise the temperature to 55°C, add water, glacial acetic acid, ethanol and isopropanol, and stir for 15 minutes.

[0030] ③ Raise the temperature to 85°C, add dodecyl stearic acid and calcium hydroxide, stir and dissolve completely.

[0031] ④ Raise the temperature to 105℃ and keep it constant for 1.5 hours.

[0032] ⑤ Raise the temperature to 170℃, add molybdenum disulfide and 70% paraffin oxide, keep the temperature constant for 15 minutes and then cool down.

[0033] ⑥ Raise the temperature to 85°C, add diphenylamine, polyisobutylene, isobutylene sulfide, and barium dinonylnaphthalene sulfonate, stir evenly and grind out the fat.

[0034] Example 2 The steps are the same as those in Example (I), except that the base oil is replaced with poly-alpha-olefin synthetic oil.

[0035] Example (III) The steps are the same as those in Example (I), except that the base oil is replaced by a mixture of polyalphaolefin synthetic oil and synthetic ester oil (1:1).

[0036] Comparative Example (I) The synthetic ester oil is simply heated and various additives are added at a certain temperature. No thickener is used (steps 2, 3, and 4 in Example (I) are omitted), and the remaining steps are the same as those in Example (I).

[0037] Comparative Example (II) No thickener is used (steps 2, 3, and 4 in Example (II) are omitted), and the remaining steps are the same as those in Example (II).

[0038] Performance Test: In all embodiments and comparative examples, the indicators obtained by testing are shown in the following table:

[0039] By comparing the various index data in the embodiment and the comparative example, it can be seen that the friction reducing agent obtained in this scheme has excellent performance in extreme pressure wear resistance, adhesion, and oxidation stability, which is better than the various data indicators in the comparative example. It can fully meet the demand for rail wear reduction and protection in railway transportation, greatly reduce the wear of the rails, and has good application value and economic value.

Claims

1. A wear reducing agent for rails, characterized in that: The wear reducer is based on composite calcium sulfonate grease, and by adding molybdenum disulfide, oxidized paraffin, tackifier, antioxidant, rust inhibitor, and extreme pressure anti-wear agent, a wear reducer with excellent extreme pressure anti-wear, adhesion, anti-oxidation and anti-rust, and stability properties is obtained, which solves the friction and wear problems during rail operation.

2. A rail wear reducer according to claim 1, characterized in that: In terms of mass percentage, it is made from the following raw materials: Base oil: 65%-80%; thickener: 10%-15%; molybdenum disulfide: 5%-8%; oxidized paraffin: 2%-3%; antioxidant: 1%-2%; viscosity enhancer: 1%-2%; extreme pressure and anti-wear agent: 2%-3%; rust inhibitor: 1%-2%.

3. A rail wear reducer as claimed in claim 2, characterized in that: The base oil is one of polyalphaolefin synthetic oil and synthetic ester oil or a mixture of the two.

4. A rail wear reducer as claimed in claim 2, characterized in that: The thickener is prepared by reacting calcium sulfonate, a conversion accelerator, a higher fatty acid and calcium hydroxide.

5. A rail wear reducer as claimed in claim 4, characterized in that: The calcium sulfonate is a high base calcium sulfonate with a base value greater than 380 mgKOH / g; the higher fatty acid is a C12-C24 fatty acid, including dodecanoic acid, hexadecanoic acid, stearic acid or dodecyl stearic acid; the conversion promoter is a mixture of water, glacial acetic acid, ethanol and isopropanol; wherein the mass ratio of water, glacial acetic acid, ethanol and isopropanol is about 3:2:1:

1.

6. A rail wear reducer as claimed in claim 4, characterized in that: The mass ratios of the components in the thickener are: calcium sulfonate 5%-6%; conversion accelerator 3%-5%; higher fatty acid 1%-2%; calcium hydroxide 1%-2%.

7. A rail wear reducer as claimed in claim 2, characterized in that: The cone penetration of the grease obtained by thickening the base oil with a thickener is between 0#-000#.

8. A rail wear reducer as claimed in claim 2, characterized in that: The cone penetration of the grease obtained by thickening the base oil with a thickener is 00#.

9. A rail wear reducer as claimed in claim 2, characterized in that: The oxidized paraffin is selected from one or more of oxidized paraffin 70, oxidized paraffin 80 or oxidized paraffin 731; the antioxidant is one or a mixture of diphenylamine, diisooctyl diphenylamine or thiocarbamate; the tackifier is one or a mixture of polyisobutylene, natural rubber or polymethacrylate; the extreme pressure anti-wear agent is one or a mixture of sulfided isobutylene, phosphate, sulfided olefin and lead cyclopentaneate; the rust inhibitor is one or a mixture of barium dinonylnaphthalene sulfonate, benzotriazole and zinc cyclopentaneate.

10. The method for preparing a friction reducing agent for rails according to any one of claims 1 to 9, characterized in that: This is accomplished by the following steps: (i) Add base oil and calcium sulfonate into a reaction kettle and stir for 30-60 minutes; (ii) raising the temperature to 40°C-60°C, and adding water, glacial acetic acid, ethanol and isopropanol in sequence; (iii) Raise the temperature to 70°C-90°C, add higher fatty acids and calcium hydroxide, and stir evenly; (iv) raising the temperature to 95°C-115°C and maintaining the temperature for 1-2 hours; (V) Raise the temperature to 160-180°C, add molybdenum disulfide and paraffin oxide, stir evenly, keep the temperature constant for 15-30 minutes, and then cool down; (VI) Add antioxidant, tackifier, extreme pressure anti-wear agent and rust inhibitor at 80℃-100℃, stir evenly and grind out the grease.

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