CN101205496B - Grease additive, grease containing the same and preparation thereof - Google Patents

Abstract

The present invention relates to a kind of lubricating grease additive, the lubricating grease containing this lubricating grease additive and their preparation method, described lubricating grease additive contains a. a kind of formula A compound/ _MoS Composite nanoparticle; b. at least one selected from Auxiliary for the following substances: antioxidants and rust inhibitors. The lubricating grease additive of the invention can improve the anti-oxidation performance and inhibit copper corrosion performance of the lubricating grease product.

Description

A kind of lubricating grease additive, lubricating grease containing it and their preparation method

technical field

The present invention relates to a lubricating grease additive, lubricating grease containing it and their preparation method. More specifically, the present invention relates to an oxidation-resistant and/or copper-corrosion-inhibiting grease additive, greases containing it, and methods for their preparation. the

Background technique

Extreme pressure and antiwear additives are a very important class of additives in lubricants. In recent years, the extreme pressure and antiwear effects of thiadiazole derivatives have been further understood, and they have begun to emerge as high-performance extreme pressure and antiwear agents for lubricating greases. This kind of extreme pressure antiwear agent does not contain phosphorus and heavy metal elements, it is an ash-free additive, and it also has functions such as anti-oxidation and metal passivation. It is an environmentally friendly and multifunctional extreme pressure antiwear agent with excellent performance (see US Patent USP 6,365,557). Among them, the reaction product of dithiooxadiazolethione and butoxytriethylene glycol has excellent four-ball extreme pressure performance and Timken extreme pressure performance, and is ashless and biodegradable, so it has extremely strong application background. Although the material has excellent extreme pressure properties, its anti-friction and anti-wear properties are insufficient, and there is still a need for improvement. the

Contents of the invention

The present inventor unexpectedly finds that if the reaction product/MoS of dithiooxadiazolethione and butoxytriethylene glycol is synthesized _Composite nanoparticles (composite nanoparticles for short, the same below) are used in base lubricating greases, and it is found that Such composite nanoparticles overcome the problem of poor anti-friction and anti-wear properties of the reaction product of dithiooxadiazolethione and butoxy triethylene glycol. On this basis, after further research, the inventors found that if an antioxidant and/or anti-rust agent is added to the grease containing composite nanoparticles to make a grease additive, the grease product can have further improved oxidation resistance performance and/or copper corrosion inhibition performance.

Therefore, the present invention provides a kind of lubricating grease additive, contains

A. a compound of formula A/ _MoS Composite nanoparticles;

b. At least one additive selected from the group consisting of antioxidants and rust inhibitors. the

The present invention also provides a method for preparing a grease additive, comprising mixing a compound nanoparticle of formula A/MoS ₂ with at least one additive selected from antioxidants and rust inhibitors.

The present invention also provides a lubricating grease, containing

a. A basic grease;

b. A compound of formula A/ _MoS Composite nanoparticles;

c. At least one additive selected from the group consisting of antioxidants and rust inhibitors. the

The present invention also provides a method of preparing grease comprising mixing a base grease and a grease additive comprising the following components:

A. a compound of formula A/ _MoS Composite nanoparticles;

b. At least one additive selected from the group consisting of antioxidants and rust inhibitors. the

The present invention also provides a method for preparing lubricating grease, comprising mixing the following components:

a. A basic grease;

b. A compound of formula A/ _MoS Composite nanoparticles;

c. At least one additive selected from the group consisting of antioxidants and rust inhibitors. the

In the present invention, "the compound of formula A/MoS ₂ composite nanoparticle" is a nanoscale particle of a composite composed of the compound of formula A and MoS ₂ . It can be obtained by the following method: in deionized water heated to 30-90°C, pass an inert gas, and then add ammonium thiomolybdate until completely dissolved. Add the compound of formula A and absolute ethanol under stirring, then add hydroxylamine hydrochloride to react, then add concentrated hydrochloric acid to continue the reaction, and a precipitate is formed; the precipitate is washed with deionized water and an organic solvent; the product is dried to obtain a compound of formula A/MoS ₂ nanoparticles.

Description of drawings

Fig. 1 is the infrared spectrogram of formula A compound. the

Figure 2 is the infrared spectrum of composite nanoparticles composed of Compound A and MoS ₂ .

12羟基润滑脂；■T₃₂₁；●T₃₅₁)。  Figure 3 is a graph of the friction coefficient of different grease products changing with time (▲Compound of formula A;

12 hydroxyl grease; ■ T ₃₂₁ ; ● T ₃₅₁ ).

Detailed ways

In the grease additive of the present invention, contain

A. a compound of formula A/ _MoS Composite nanoparticles;

b. At least one additive selected from the group consisting of antioxidants and rust inhibitors. the

The method for preparing grease additives of the present invention comprises mixing a compound nanoparticle of formula A/MoS ₂ with at least one additive selected from antioxidants and rust inhibitors.

In the lubricating grease of the present invention, contain

a. A basic grease;

b. A compound of formula A/ _MoS Composite nanoparticles;

c. At least one additive selected from the group consisting of antioxidants and rust inhibitors. the

The method for preparing lubricating grease of the present invention comprises mixing a kind of base lubricating grease and a kind of lubricating grease additive comprising following component:

A. a compound of formula A/ _MoS Composite nanoparticles;

b. At least one additive selected from the group consisting of antioxidants and rust inhibitors. the

The present invention also provides a method for preparing lubricating grease, comprising mixing the following components:

a. A basic grease;

b. A compound of formula A/ _MoS Composite nanoparticles;

c. At least one additive selected from the group consisting of antioxidants and rust inhibitors. the

In the grease additive, grease and their preparation methods of the present invention, the used formula A compound/ _MoS Composite nanoparticles—that is, the nanoscale particles of the composite composed of the formula A compound and _MoS— It can be obtained by the following method: in deionized water heated to 30-90°C, pass an inert gas, and then add ammonium thiomolybdate until completely dissolved. Add the compound of formula A under stirring (the molar ratio of compound of formula A to ammonium thiomolybdate is preferably 0.1:10-10:0.1, more preferably 0.2:5-5:0.2, further preferably 0.5:2-2:0.5) react with absolute ethanol, then add hydroxylamine hydrochloride, and then add concentrated hydrochloric acid to continue the reaction, and a precipitate is formed; the precipitate is washed with deionized water and an organic solvent; the product is dried to obtain a compound nanoparticle of formula A/MoS ₂ . The nanoparticle has an infrared spectrum shown in FIG. 2 .

For the purposes of the present invention, the particle size of the compound of formula A/MoS ₂ composite nanoparticles is not higher than 100 nm.

In the present invention, "compound of formula A" refers to a compound having the following molecular formula:

The compound can be prepared in the following manner: p-dithioxadiazolethione reacts with butoxytriethylene glycol at 90-150°C, and then filters to obtain the product. After characterization, the product has an infrared spectrogram shown in Figure 1. Dithiooxadiazolethione and butoxytriethylene glycol are preferably in a molar ratio of 0.1:10-10:0.1, more preferably in a molar ratio of 0.2:5-5:0.2, most preferably in a molar ratio of 0.2:1-0.5 : 1 molar ratio, react at 100-140°C, more preferably 110-135°C; the reaction time is preferably 0.5-5 hours, more preferably 1-3 hours, most preferably 1.5-2 hours. the

Antioxidants used in the present invention include, but are not limited to, phenolic, amine, sulfur, phosphorus, and nitrogen compounds. In grease additives, the content of antioxidants is usually 1.0-40%, preferably 10-35%, more preferably 25-35%, based on the weight of the nanoparticles of the compound of formula A/ _MoS2 . Among them, 2,6-di-tert-butyl-p-cresol is preferred as phenolic antioxidant; diphenylamine is preferred as amine antioxidant; phenothiazine is preferred as antioxidant containing sulfur, phosphorus and nitrogen compounds.

The rust inhibitors according to the present invention include but not limited to organic carboxylic acid rust inhibitors, organic amine rust inhibitors, sulfur and nitrogen heterocycle rust inhibitors. In the grease additive, the content of the rust inhibitor is generally 0.1-40%, preferably 5.0-35%, more preferably 10.0-35%, based on the weight of the compound of formula A/MoS ₂ composite nanoparticles used. Among them, the preferred dodecenyl succinic acid as the organic carboxylic acid rust inhibitor; Diacid; nitrogen heterocyclic rust inhibitor is preferably benzotriazole.

In the grease of the present invention, the base grease may be a grease suitable for use in combination with the compound of formula A/MoS ₂ composite nanoparticles, preferably 12 hydroxy lithium stearate base grease. 12 hydroxy lithium stearate can be mixed with the following raw materials: 12 hydroxy stearic acid, base oil (such as 500SN mineral oil) and lithium hydroxide.

In the grease of the present invention, each component that constitutes a grease additive—that is, two types of substances that constitute a grease additive: one is a compound of formula A/MoS ₂ composite nanoparticles; and at least one auxiliary compound selected from the following materials Agents: antioxidants and rust inhibitors—the content is 0.1-10%, preferably 1.0-8.0%, more preferably 2.0-5.0%, based on the weight of the base grease.

For the purpose of preparing the grease additive of the present invention, in the process of mixing a compound of formula A/ _MoS2 composite nanoparticles with at least one auxiliary agent selected from antioxidants and rust inhibitors, heating, stirring, etc. can be used method.

For the purpose of preparing the lubricating grease of the present invention, a kind of formula A compound/ _MoS Composite nanoparticles can be mixed with at least one auxiliary agent selected from antioxidants and rust inhibitors to make grease additives, and then The grease additive is mixed with the base grease; it is also possible to directly mix a base grease, a compound of formula A/MoS ₂ composite nanoparticles and at least one additive selected from antioxidants and rust inhibitors. In both production methods, heating, stirring, etc. may be employed as necessary in each step.

The lubricating grease additive of the present invention can improve the anti-oxidation performance and inhibit copper corrosion performance of the lubricating grease product. the

Example

The present invention will be illustrated by way of examples below. The present invention includes but is not limited to the following examples. In the embodiment, lithium 12 hydroxystearate is mixed with the following raw materials: 12 hydroxystearic acid, 10% (percentage by weight, the same below); base oil is 500SN mineral oil, 90%; Lithium hydroxide, 0.8% (based on the weight sum of 12 hydroxystearic acid and base oil). The 1/4 cone penetration of the prepared 12-hydroxy lithium stearate is 64, which belongs to 2# grease. the

Preparation Example 1

The preparation of formula A compound

Add p-dithiooxadiazolethione and butoxytriethylene glycol (respectively denoted as "ketone" and "alcohol") into a three-necked flask, react at a certain temperature for several hours, and then filter to obtain the product. the

After characterization, the product has the infrared spectrum shown in Figure 1. the

A total of 16 preparations were carried out, and the results are shown in Table 1:

The preparation of table 1 formula A compound

serial number Feed weight (ketone/alcohol) Feed molar ratio (ketone/alcohol) Reaction temperature (℃) Response time (hours) Product Weight (g) Yield (%) 1 5.96/20.6 0.2:1 105 1.5 17.00 64 2 5.96/20.6 0.2:1 115 2 18.59 70 3 5.96/20.6 0.2:1 125 3 21.78 82 4 5.96/20.6 0.2:1 135 4 19.12 72 5 2.98/4.12 0.5:1 105 2.5 4.33 61 6 2.98/4.12 0.5:1 115 1.5 5.11 72 7 2.98/4.12 0.5:1 125 3 6.11 86 8 2.98/4.12 0.5:1 135 2 5.32 75 9 2.98/2.06 1:1 105 2.5 3.02 60 10 2.98/2.06 1:1 115 3 3.73 74 11 2.98/2.06 1:1 125 4 4.03 80 12 2.98/2.06 1:1 135 4.5 3.53 70 13 5.96/2.06 2:1 105 2.5 4.65 58 14 5.96/2.06 2:1 115 3.5 5.61 70 15 5.96/2.06 2:1 125 3 6.10 76 16 5.96/2.06 2:1 135 4 5.21 65

Preparation Example 2

Formula A compound/MoS ₂ Preparation of Composite Nanoparticle I (Composite Nanoparticle I for short)

In a three-neck flask, add 150ml of deionized water, heat to 85°C, and keep the temperature constant. After passing helium for 10 minutes, add 2.6 g of ammonium thiomolybdate until completely dissolved. Constant temperature, add 1.8g of compound of formula A and 20ml of absolute ethanol under stirring, then add 0.7g of hydroxylamine hydrochloride, react for 2 hours, then gradually add 1ml of concentrated hydrochloric acid, continue to react for 6 hours, a brown precipitate is formed. The precipitate was washed with deionized water, absolute ethanol, and acetone in large quantities. The product was put into a vacuum drying oven at a drying temperature of 80° C. for 48 hours to obtain 3.3 g of compound nanoparticles of formula A/MoS ₂ . Characterized by transmission electron microscopy (TEM), it was found that the particle size was below 45nm.

The obtained nanoparticles have the infrared spectrum shown in FIG. 2 . the

Preparation Example 3

Formula A compound/MoS ₂ Preparation of Composite Nanoparticle II (abbreviated as Composite Nanoparticle II)

In a three-necked flask, add 180ml of deionized water, heat to 70°C, and keep the temperature constant. After passing helium for 35 minutes, add 4.0 g of ammonium thiomolybdate until completely dissolved. At constant temperature, 2.3 g of the compound of formula A and 30 ml of absolute ethanol were added under stirring. Then add 1.2 g of hydroxylamine hydrochloride, react for 2 hours, then gradually add 1 ml of concentrated hydrochloric acid, continue to react for 6 hours, a brown precipitate is formed. The precipitate was washed with deionized water, absolute ethanol, and acetone in large quantities. The product was put into a vacuum drying oven at a drying temperature of 80° C. for 48 hours to obtain 4.76 g of compound nanoparticles of formula A/MoS ₂ . Characterized by transmission electron microscopy (TEM), it was found that the particle size was below 50nm.

The obtained nanoparticles have the infrared spectrum shown in FIG. 2 . the

Comparative Example 1

Preparation of grease containing compound of formula A and performance test

Adopt 3g formula A compound and 100g 12 hydroxy lithium stearate base fats to mix at room temperature, obtain lubricating grease product (wherein do not add antioxidant and antirust agent), and according to ASTM D942 and ASTM D4048 respectively carry out anti-oxidation and ASTM D4048 Anti-copper corrosion test, the results are shown below. the

Comparative Example 2

Anti-friction and anti-wear performance test and anti-sintering performance experiment of the compound of formula A

1. Anti-friction performance experiment

Respectively adopt 3g of formula A compound, T ₃₂₁ and T ₃₅₁ (T ₃₂₁ and T ₃₅₁ are extreme pressure and anti-wear additives commonly used in grease, commercially available products, the same below), and 100g of 12 hydroxy lithium stearate base fat at room temperature Mix to make a grease product. The anti-friction performance test of the obtained product was carried out in accordance with SH/T0189-92, using a Serial 201-1284-VD Falex Corporation Aurora.1L 60505U.SA friction and wear testing machine, the motor speed was 1200±50r/min, and the temperature was room temperature. Load 392N, time 40min, evaluate the anti-friction performance of the grease, the results are shown in Figure 3 (the smaller the friction coefficient, the better, which means that it can effectively reduce the energy loss caused by friction).

Fig. 3 is the graph of the friction coefficient versus time of lubricating grease and 12 hydroxystearate lithium base grease (blank grease, without additive) prepared by adopting various additives (respectively marked as formula A compound, T ₃₂₁ and T ₃₅₁ ) . It can be seen from Figure 3 that the grease containing the compound of formula A has a high and unstable friction coefficient curve, and its anti-friction performance is not good.

2. Anti-wear performance experiment

The additives of different weight ratios (based on the weight of 12 hydroxy lithium stearate) were respectively mixed with 100g of 12 hydroxy lithium stearate at room temperature to prepare a grease product. The anti-wear property test was carried out on the obtained product. The experiment was carried out in accordance with SH/T0204-92, using Serial201-1284-VD Falex Corporation Aurora.1L 60505U.S.A friction and wear testing machine, the motor speed was 1200±50r/min, the temperature was room temperature, the load was 392N, and the time was 60min. The results are shown in the table 2 (the smaller the wear spot, the better the anti-wear performance). the

Table 2 Wear scar diameter of grease prepared with different additives

Additives and dosage Wear scar diameter, mm (No additives, i.e. only 12-hydroxy lithium stearate) 0.61 Compound of formula A, 1% 0.70 Compound of formula A, 2% 0.71 Compound of formula A, 3% 0.70 Compound of formula A, 4% 0.75 Composite nanoparticles I, 2% 0.43 Composite nanoparticles II, 2% 0.43 Composite Nanoparticles II, 3% 0.43 Composite Nanoparticles II, 4% 0.40 T ₃₂₁ , 2% 0.62 T ₃₅₁ , 2% 0.50

3. Anti-sintering performance experiment

The additives of different weight ratios (based on the weight of 12 hydroxy lithium stearate) were respectively mixed with 100g of 12 hydroxy lithium stearate at room temperature to prepare a grease product. The anti-sintering performance test was carried out on the obtained product. The experiment is measured according to SH/T0202, the motor speed is 1770±60r/min, the temperature is room temperature, and the test time is 10s. The extreme pressure performance of grease is evaluated by anti-sintering performance (the larger the sintering load value, the better the extreme pressure performance). The results are shown in Table 3. the

Table 3 Experimental results of extreme pressure performance

Additives base fat Amount added, m% Four-ball sintering load, Kgf Compound of formula A 12 Hydroxy Lithium Stearate 3% 2% 1% 500 400 250 T ₃₂₁ 12 Hydroxy Lithium Stearate 3% 2% 1% 400 250 250 T ₃₅₁ 12 hydroxy lithium stearate 3% 2% 1% 250 250 200 Composite nanoparticles I 12 hydroxy lithium stearate 3% 2% 1% 500 500 400 Composite Nanoparticles II 12 hydroxy lithium stearate 4% 3% 2% 620 500 500

Comparative Example 3

Grease preparation and performance testing

12 hydroxystearic acid lithium base grease 100g is mixed with composite nanoparticle 13g at room temperature, obtains grease product (wherein does not add antioxidant and antirust agent), and carry out oxidation resistance respectively according to ASTM D942 and ASTM D4048 And anti-copper corrosion experiment, the results are shown below. the

Example 1-13

Preparation of grease additives, grease preparation and performance testing

Different weights of composite nanoparticles I and II prepared in Preparation Examples 1-2 were mixed with different weights of antioxidants and antirust agents at room temperature to obtain grease additives 1-13. the

The obtained grease additives 1-13 were mixed with the base grease respectively at room temperature to obtain grease products 1-13, and anti-oxidation and copper corrosion tests were carried out according to ASTM D942 and ASTM D4048 respectively, and the results are as follows. the

Example 1

Raw materials: composite nanoparticles 13g, dodecenyl succinic acid 0.01g, 12 hydroxy lithium stearate 100g. the

Example 2

Raw materials: 3g of composite nanoparticles II, 0.2g of dodecenyl butanediammonium, 100g of lithium 12 hydroxystearate. the

Example 3

Raw materials: composite nanoparticles 1 3g, dodecenyl butanediamine 1g, 12 hydroxy lithium stearate 100g. the

Example 4

Raw materials: composite nanoparticle 1 3g, 2-aminoethyl heptadecenyl imidazoline dodecenyl succinic acid 0.2g, 12 hydroxy lithium stearate 100g. the

Example 5

Raw materials: 3g of composite nanoparticles II, 0.3g of diphenylamine, 100g of lithium 12 hydroxystearate. the

Example 6

Raw materials: composite nanoparticles 1 3g, diphenylamine 1.0g, 12 hydroxy lithium stearate 100g. the

Example 7

Raw materials: 3g of composite nanoparticles II, 0.05g of 2,6-di-tert-butyl-p-cresol, and 100g of lithium 12-hydroxystearate. the

Example 8

Raw materials: composite nanoparticles I 3g, 2,6-di-tert-butyl-p-cresol 1g, 12 hydroxy lithium stearate 100g. the

Example 9

Raw materials: 3g of composite nanoparticles II, 0.3g of diphenylamine, 0.01g of dodecenylsuccinic acid, 100g of lithium 12 hydroxystearate. the

Example 10

Raw materials: composite nanoparticle 1 3g, diphenylamine 1.0g, dodecenyl succinic acid 0.01g, 12 hydroxy lithium stearate 100g. the

Example 11

Raw materials: 3g of composite nanoparticles II, 0.05g of 2,6-di-tert-butyl-p-cresol, 0.2g of dodecenyl butanediammonium, and 100g of 12-hydroxy lithium stearate. the

Example 12

Raw materials: composite nanoparticles 1 3g, 2,6-di-tert-butyl-p-cresol 0.05g, dodecenyl butanediamine 1g, 12 hydroxy lithium stearate 100g. the

Example 13

Raw materials: 3g of composite nanoparticles II, 1g of 2,6-di-tert-butyl-p-cresol, 0.2g of 2-aminoethyl heptadecenyl imidazolinium dodecenyl succinic acid, 12 hydroxy lithium stearate 100g. the

Examples 14-22

Grease preparation and performance testing

Take different weights of composite nanoparticles I and II prepared in Preparation Example 1-2, mix with different weights of antioxidants and rust inhibitors, and base grease at room temperature to obtain grease products 14-24, and According to ASTM D942 and ASTM D4048, the anti-oxidation and anti-copper corrosion tests were carried out, and the results are as follows. the

Example 14

Raw materials: 90g of lithium 12 hydroxystearate, 3g of composite nanoparticles II, 1g of 2-aminoethylheptadecenylimidazolinium dodecenylsuccinic acid. the

Example 15

Raw materials: 12 hydroxy lithium stearate 100g, composite nanoparticle 13g, benzotriazole 0.05g. the

Example 16

Raw materials: 12 hydroxy lithium stearate 100g, composite nanoparticles II 3g, benzotriazole 0.1g. the

Example 17

Raw materials: 12 hydroxy lithium stearate 100g, composite nanoparticles II 3g, phenothiazine 0.5g. the

Example 18

Raw materials: 12 hydroxy lithium stearate 75g, composite nanoparticles 13g, phenothiazine 1.0g. the

Example 19

Raw materials: 83g of lithium 12 hydroxystearate, 3g of composite nanoparticles II, 1g of 2,6-di-tert-butyl-p-cresol, 1g of 2-aminoethylheptadecenyl imidazolinium dodecenylsuccinic acid . the

Example 20

Raw materials: 12 hydroxy lithium stearate 95g, composite nanoparticle 13g, phenothiazine 0.3g, benzotriazole 0.05g. the

Example 21

Raw materials: 100g of lithium 12 hydroxystearate, 3g of composite nanoparticles II, 0.5g of phenothiazine, and 0.1g of benzotriazole. the

Example 22

Raw materials: 95g of lithium 12 hydroxystearate, 3g of composite nanoparticles II, 1.0g of phenothiazine, and 0.1g of benzotriazole. the

Claims (15)

1. a grease additive contains

A. formula A compound/MoS ₂Composite nano particle;

B. at least a auxiliary agent that is selected from following material: oxidation inhibitor and rust-preventive agent.

2. according to the grease additive of claim 1, wherein said formula A compound/MoS ₂Composite nano particle adopts following method to obtain: in being heated to 30-90 ℃ deionized water, logical rare gas element adds ammonium thiomolybdate then to dissolving fully; Stir adding formula A compound and absolute ethyl alcohol down, add the oxammonium hydrochloride reaction then, add concentrated hydrochloric acid again and continue reaction, have deposition to generate; Precipitate with deionized water and organic solvent flushing; Product is dry, obtain formula A compound/MoS ₂Composite nano particle.

3. according to the grease additive of claim 1, wherein oxidation inhibitor is selected from phenol type, amine type, sulfur-bearing, phosphorus and nitrogen compound.

4. according to the grease additive of claim 3, wherein oxidation inhibitor is selected from 2,6-toluene di-tert-butyl phenol, pentanoic and thiodiphenylamine.

5. according to the grease additive of claim 1, wherein rust-preventive agent is selected from organic carboxyl acid class rust-preventive agent, organic amine rust-preventive agent, sulphur and nitrogen heterocycles rust-preventive agent.

6. according to the grease additive of claim 5, wherein rust-preventive agent is selected from dodecenylsuccinic acid, laurylene base tetramethylenediamine, 2-amino-ethyl 17 alkenyl imidazoline dodecenylsuccinic acid and benzotriazoles.

7. according to the grease additive of claim 1, wherein, with formula A compound/MoS ₂The weight of composite nano particle is benchmark, and the content of oxidation inhibitor is 1.0-40%, and the content of rust-preventive agent is 0.1-40%.

8. a method for preparing grease additive comprises a kind of formula A compound/MoS ₂Composite nano particle mixes with at least a auxiliary agent that is selected from oxidation inhibitor and rust-preventive agent.

9. according to Claim 8 method, wherein said formula A compound/MoS ₂Composite nano particle adopts following method to obtain: in being heated to 30-90 ℃ deionized water, logical rare gas element adds ammonium thiomolybdate then to dissolving fully; Stir adding formula A compound and absolute ethyl alcohol down, add the oxammonium hydrochloride reaction then, add concentrated hydrochloric acid again and continue reaction, have deposition to generate; Precipitate with deionized water and organic solvent flushing; Product is dry, obtain formula A compound/MoS ₂Composite nano particle.

10. a railway grease contains

A. basic lubricating grease;

B. formula A compound/MoS ₂Composite nano particle;

C. at least a auxiliary agent that is selected from following material: oxidation inhibitor and rust-preventive agent.

11. according to the railway grease of claim 10, wherein said formula A compound/MoS ₂Composite nano particle adopts following method to obtain: in being heated to 30-90 ℃ deionized water, logical rare gas element adds ammonium thiomolybdate then to dissolving fully; Stir adding formula A compound and absolute ethyl alcohol down, add the oxammonium hydrochloride reaction then, add concentrated hydrochloric acid again and continue reaction, have deposition to generate; Precipitate with deionized water and organic solvent flushing; Product is dry, obtain formula A compound/MoS ₂Composite nano particle.

12. according to the railway grease of claim 10, wherein basic lubricating grease is 12 hydroxy lithium stearate base fat.

13., wherein, be benchmark, constitute each component of grease additive with the weight of basic lubricating grease according to the railway grease of claim 10---promptly constitute two types of materials of grease additive: a kind of formula A compound/MoS ₂Composite nano particle; And at least a auxiliary agent that is selected from following material: oxidation inhibitor and rust-preventive agent---content be 0.1-10%.

14. a method for preparing railway grease comprises and mixes a kind of basic lubricating grease and a kind of grease additive that comprises following component:

A. formula A compound/MoS ₂Composite nano particle;

B. at least a auxiliary agent that is selected from following material: oxidation inhibitor and rust-preventive agent.

15. a method for preparing railway grease comprises and mixes following component:

A. basic lubricating grease;

B. formula A compound/MoS ₂Composite nano particle;

C. at least a auxiliary agent that is selected from following material: oxidation inhibitor and rust-preventive agent.

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