Anti-wear hydraulic oil and preparation method thereof

Abstract

The present invention discloses an anti-wear hydraulic oil and a preparation method thereof, and relates to the field of hydraulic oil technology. The anti-wear hydraulic oil comprises the following raw materials in parts by weight: base oil: 80-120 parts, modified extreme pressure anti-wear agent: 0.5-3 parts, antioxidant: 2-4 parts, anti-emulsifier: 0.2-0.6 parts, anti-foaming agent: 0.01-0.03 parts, anti-corrosion agent: 0.5-2 parts, rust inhibitor: 1-5 parts. The present invention prepares a polyimide copolymer by reacting 2,2'-p-phenyl bis-(5-aminobenzimidazole), 3,3',4,4'-dibenzophenone tetracarboxylic dianhydride and bisphenol A dianhydride, and the polymer is modified by MoS2 to obtain a modified extreme pressure anti-wear agent. The anti-wear hydraulic oil prepared by the present invention has the characteristics of good viscosity-temperature performance, stable oxidation stability and excellent friction performance.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic oil, in particular to an anti-wear hydraulic oil and a preparation method thereof. Background Art

[0002] In recent years, with the development and continuous improvement of hydraulic system design and manufacturing technology, hydraulic technology has been widely used in new-generation machinery and equipment. The variability of the operating environment of hydraulic machinery poses a great challenge to hydraulic oil. However, the anti-wear hydraulic oil currently in widespread use suffers from problems such as a low viscosity index, poor viscosity-temperature performance, unstable oxidation stability, oxidative sludge formation at high temperatures, and oil filter clogging. Furthermore, the oil has insufficient load-bearing capacity and cannot withstand large shock loads. Therefore, it is necessary to develop an anti-wear hydraulic oil with good viscosity-temperature performance, stable oxidation stability, and excellent friction properties. This will broaden the temperature applicability of the hydraulic oil, extend the service life of hydraulic machinery, prolong the use of the hydraulic oil, save energy, and reduce pollution.

[0003] Chinese invention patent publication number CN106947570A discloses an anti-wear hydraulic oil and a preparation method thereof. The anti-wear hydraulic oil is composed of the following raw materials in parts by weight: 80-85% base oil, 15-20% pentaerythritol tetraethyl octanoate, and 0.5-1.0% composite additives. The anti-wear hydraulic oil has good corrosion resistance and thermal stability, but poor anti-wear performance. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention aims to provide an anti-wear hydraulic oil and a preparation method thereof.

[0005] To achieve the above object, the present invention is implemented through the following technical solutions:

[0006] An anti-wear hydraulic oil comprises the following raw materials in parts by weight:

[0007] Base oil: 80-120 parts, modified extreme pressure anti-wear agent: 0.5-3 parts, antioxidant: 2-4 parts, anti-emulsifier: 0.2-0.6 parts, anti-foaming agent: 0.01-0.03 parts, anti-corrosion agent: 0.5-2 parts, rust inhibitor: 1-5 parts;

[0008] The modified extreme pressure anti-wear agent is prepared by the following method:

[0009] S1: Under nitrogen protection, DMAc is added to the reaction bottle, and then 2,2'-p-phenylbis-(5-aminobenzimidazole) is slowly added and uniformly dispersed in DMAc. 3,3',4,4'-benzophenone tetracarboxylic dianhydride is slowly added, and the mixture is reacted in an ice-water bath for 4 hours to obtain a light yellow turbid suspension. Bisphenol A dianhydride is then slowly added, and the mixture is reacted in an ice-water bath for 8-12 hours to obtain a viscous polyamic acid solution. Toluene is then added, and the mixture is heated to 130-140°C and reacted for 6-8 hours. The mixture is cooled to room temperature, and then deionized water is added to precipitate a solid precipitate. The solid precipitate is filtered and vacuum dried to obtain a polyimide powder. The reaction equation is as follows:

[0010]

[0011] Among them, m and n are natural numbers.

[0012] S2: Add polyimide powder, MoS2 and deionized water into a high-speed mixer and mix them evenly to obtain a modified extreme pressure anti-wear agent.

[0013] The mass ratio of the DMAc, 2,2'-p-phenylbis-(5-aminobenzimidazole), 3,3',4,4'-benzophenone tetracarboxylic dianhydride and bisphenol A dianhydride is 100:(6-10):(12-16):(3-5).

[0014] The mass ratio of the polyimide powder, MoS2 and deionized water is 5:(2-3):10.

[0015] The base oil is at least one of GTL III+ base oil and poly α-olefin PAO; the GTL III+ base oil is Shell's GTL420 or GTL430, and the poly α-olefin PAO is Sinopec's PAO4 or PAO6.

[0016] The antioxidant is at least one of 2,6-di-tert-butyl-p-cresol, N,N'-di-sec-butyl-p-phenylenediamine and 2,6-di-tert-butylphenol.

[0017] The anti-emulsifier is a combination of one or more of DL32 polyether polymer compounds and polyethylene oxide-propylene oxide ether.

[0018] The antifoaming agent is one of dimethyl silicone oil and 1# composite defoaming agent.

[0019] The anticorrosive agent is a combination of one or more of T203 phosphorus dioctyl basic zinc salt and N-phenyl-α-naphthylamine.

[0020] The rust preventive agent is a combination of one or more of barium dinonylnaphthalenesulfonate, alkenyl succinic acid, and alkenyl succinate esters.

[0021] A method for preparing an anti-wear hydraulic oil comprises the following steps:

[0022] (1) Weigh the base oil, modified extreme pressure anti-wear agent, antioxidant, anti-emulsifier, anti-corrosion agent, and rust inhibitor according to the ratio, add them into the reactor, stir evenly, heat to 40-60℃, and stir for 20-40min;

[0023] (2) Add anti-foaming agent to the above step (1) and continue stirring for 30-50 minutes to obtain high-performance anti-wear hydraulic oil.

[0024] Due to the adoption of the above technical solution, the beneficial effects of the present invention include:

[0025] (1) The present invention prepares a polyimide copolymer by copolymerization of 2,2'-p-phenylbis-(5-aminobenzimidazole), 3,3',4,4'-dibenzophenone tetracarboxylic dianhydride and bisphenol A dianhydride, and then adds MoS2 to modify the polymer to prepare a modified extreme pressure anti-wear agent.

[0026] (2) The polyimide polymer prepared by the present invention contains imide bonds, nitrogen-containing five-membered heterocyclic rings, benzene rings, ether bonds, etc. on its main chain. The carbon and oxygen bonds in the aromatic rings are connected by double bonds. In addition, the conjugation effect of the aromatic rings enhances the binding force. This molecular structure has the advantages of good thermal stability, wear resistance, corrosion resistance, and good mechanical properties. At the same time, the addition of self-lubricating material MoS2 to the polyimide matrix increases the interfacial energy of the polymer surface and thus reduces the contact area during friction. This can not only improve the load-bearing capacity of the polymer matrix and reduce the plastic deformation capacity of the surface, but also reduce the friction coefficient and wear rate, thereby giving the polymer composite material ideal anti-wear properties. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to the embodiments, but the present invention is not limited to these embodiments.

[0028] Example 1

[0029] Preparation of modified extreme pressure antiwear agent:

[0030] S1: Under nitrogen protection, 100g DMAc was added to the reaction bottle and stirred. Then 6g 2,2'-p-phenylbis-(5-aminobenzimidazole) was slowly added and evenly dispersed in DMAc. 12g 3,3',4,4'-dibenzophenone tetracarboxylic dianhydride was slowly added and reacted in an ice-water bath for 4h to obtain a light yellow turbid suspension. Then 3g bisphenol A dianhydride was slowly added and reacted in an ice-water bath for 8h to obtain a viscous polyamic acid solution. Then 20ml toluene was added, heated to 130℃ for reaction for 8h, then cooled to room temperature, and then 100ml deionized water was added to precipitate a solid precipitate. The solid precipitate was filtered and vacuum dried at 60℃ for 4h to obtain polyimide powder.

[0031] S2: Add 50 g of polyimide powder, 20 g of MoS2 and 100 g of deionized water into a high-speed blender and stir for 2 h to mix them evenly to obtain a modified extreme pressure anti-wear agent.

[0032] Example 2

[0033] Preparation of modified extreme pressure antiwear agent:

[0034] S1: Under nitrogen protection, 100g DMAc was added to the reaction bottle and stirred. Then 8g 2,2'-p-phenylbis-(5-aminobenzimidazole) was slowly added and evenly dispersed in DMAc. 14g 3,3',4,4'-dibenzophenone tetracarboxylic dianhydride was slowly added and reacted in an ice-water bath for 4h to obtain a light yellow turbid suspension. 4g bisphenol A dianhydride was slowly added and reacted in an ice-water bath for 10h to obtain a viscous polyamic acid solution. 20ml toluene was then added and heated to 135°C for 7h. The mixture was then cooled to room temperature. 100ml deionized water was then added to precipitate a solid precipitate. The solid precipitate was filtered and dried in vacuo at 65°C for 3h to obtain a polyimide powder.

[0035] S2: Add 50 g of polyimide powder, 25 g of MoS2 and 100 g of deionized water into a high-speed blender and stir for 2 h to mix them evenly to obtain a modified extreme pressure anti-wear agent.

[0036] Example 3

[0037] Preparation of modified extreme pressure antiwear agent:

[0038] S1: Under nitrogen protection, 100g DMAc was added to the reaction bottle and stirred. Then 10g 2,2'-p-phenylbis-(5-aminobenzimidazole) was slowly added and evenly dispersed in DMAc. 16g 3,3',4,4'-dibenzophenone tetracarboxylic dianhydride was slowly added and reacted in an ice-water bath for 4h to obtain a light yellow turbid suspension. Then 5g bisphenol A dianhydride was slowly added and reacted in an ice-water bath for 12h to obtain a viscous polyamic acid solution. Then 20ml toluene was added, heated to 140℃ for reaction for 6h, then cooled to room temperature, and then 100ml deionized water was added to precipitate a solid precipitate. The solid precipitate was filtered and vacuum dried at 70℃ for 2h to obtain polyimide powder.

[0039] S2: Add 50 g of polyimide powder, 30 g of MoS2 and 100 g of deionized water into a high-speed blender and stir for 2 h to mix them evenly to obtain a modified extreme pressure anti-wear agent.

[0040] Example 4

[0041] Preparation of anti-wear hydraulic oil:

[0042] (1) 80 g of base oil (GTL430), 0.5 g of modified extreme pressure anti-wear agent (prepared in Example 1), 2 g of antioxidant (2,6-di-tert-butyl-p-cresol), 0.2 g of anti-emulsifier (DL32 polyether polymer compound), 0.5 g of corrosion inhibitor (T203 bisoctyl basic zinc salt of phosphorus), and 1 g of rust inhibitor (barium dinonylnaphthalenesulfonate) were added to a reactor, stirred evenly, and heated to 40°C with a stirring speed of 300 r / min for 40 min.

[0043] (2) Add 0.01 g of anti-foaming agent (dimethyl silicone oil) to the above step (1) and continue stirring for 30 min at a stirring speed of 500 r / min to obtain high-performance anti-wear hydraulic oil.

[0044] Example 5

[0045] Preparation of anti-wear hydraulic oil:

[0046] (1) Add 100 g of base oil (50 g of GTL420 + 50 g of GTL430), 1.5 g of modified extreme pressure anti-wear agent (prepared in Example 2), 3 g of antioxidant (N,N'-di-sec-butyl-p-phenylenediamine), 0.4 g of anti-emulsifier (polyethylene oxide-propylene oxide ether), 1.2 g of corrosion inhibitor (N-phenyl-α-naphthylamine), and 3 g of rust inhibitor (1 g of alkenyl succinic acid + 2 g of barium dinonylnaphthalenesulfonate) into a reactor, stir evenly, heat to 50 ° C, stir at a speed of 400 r / min, and stir for 30 min;

[0047] (2) Add 0.02 g of antifoaming agent (1# composite defoaming agent) to the above step (1) and continue stirring for 40 min at a stirring speed of 400 r / min to obtain high-performance anti-wear hydraulic oil.

[0048] Example 6

[0049] Preparation of anti-wear hydraulic oil:

[0050] (1) 120 g of base oil (60 g of PAO6 + 60 g of PAO4), 3 g of modified extreme pressure anti-wear agent (prepared in Example 3), 4 g of antioxidant (2 g of 2,6-di-tert-butylphenol + 2 g of N,N'-di-sec-butyl-p-phenylenediamine), 0.6 g of anti-emulsifier (polyethylene oxide-propylene oxide ether), 2 g of anti-corrosion agent (N-phenyl-α-naphthylamine), and 5 g of rust inhibitor (2 g of alkenyl succinate + 3 g of alkenyl succinate) were added to a reactor, stirred evenly, and heated to 60 ° C. The stirring speed was 500 r / min and the stirring time was 20 min.

[0051] (2) Add 0.03 g of antifoaming agent (1# composite defoaming agent) to the above step (1) and continue stirring for 50 min at a stirring speed of 300 r / min to obtain high-performance anti-wear hydraulic oil.

[0052] Comparative Example 1

[0053] The preparation method of the anti-wear hydraulic oil is basically the same as that of Example 5, except that no modified extreme pressure anti-wear agent is added to the composition.

[0054] Comparative Example 2

[0055] The preparation method of the anti-wear hydraulic oil is basically the same as that of Example 5, except that the modified extreme pressure anti-wear agent is replaced by an equal weight of the polyimide powder prepared in step S1 of Example 2.

[0056] Comparative Example 3

[0057] The preparation method of the anti-wear hydraulic oil is basically the same as that of Example 5, except that the modified extreme pressure anti-wear agent is replaced by 0.3g 2,2'-p-phenylbis-(5-aminobenzimidazole), 0.5g 3,3',4,4'-dibenzophenone tetracarboxylic dianhydride, 0.15g bisphenol A dianhydride and 0.55g MoS2.

[0058] Comparative Example 4

[0059] The raw materials of Example 3 of the Chinese invention patent with publication number CN106947570A were used to produce anti-wear hydraulic oil using the production process of the present application.

[0060] The MoS2 used in the examples and comparative examples of the present application was purchased from Huajing Powder Material Technology Co., Ltd.; DL32 polyether polymer compound was purchased from Jinzhou Shengda Chemical Co., Ltd.; polyethylene oxide-propylene oxide ether was purchased from Nanjing Ningjiang Chemical Plant; dimethyl silicone oil with CAS number: 9006-65-9 was purchased from Qianyan Chemical Technology (Wuhan) Co., Ltd.; 1# composite defoamer was purchased from Suzhou Xingchangrun Chemical Co., Ltd.; T203 bisoctyl alkaline zinc salt of phosphine was purchased from Jining Benoke Biotechnology Co., Ltd.; alkenyl succinic acid and alkenyl succinate were purchased from Jinzhou Xinxing Petroleum Additives Co., Ltd.

[0061] The anti-wear hydraulic oils prepared in Examples 4-6 of the present application and Comparative Examples 1-4 were fully formulated for physical and chemical properties, including viscosity, viscosity index, pour point, flash point, copper corrosion, wear resistance and oxidation stability. The test results are shown in Table 1.

[0062] Table 1

[0063]

[0064] It can be seen from Table 1 that the anti-wear hydraulic oils prepared in Examples 4-6 of the present application have good viscosity-temperature properties, excellent oxidation stability and anti-wear properties.

[0065] Comparative Example 1 is a comparative example of an anti-wear hydraulic oil prepared without adding a modified extreme pressure anti-wear agent. From the data in Table 1, it can be seen that its wear diameter is 0.38 mm, the friction coefficient is 0.1021, and the anti-wear performance is poor.

[0066] The modified extreme pressure and anti-wear agent added in Comparative Example 2 is the polyimide powder prepared in step S1. As can be seen from Table 1, its wear diameter is 0.36 mm, and its friction coefficient is 0.0921, and its anti-friction and anti-wear performance is not obvious.

[0067] The modified extreme pressure anti-wear agent added in Comparative Example 3 is 0.3g 2,2'-p-phenylbis-(5-aminobenzimidazole), 0.5g 3,3',4,4'-dibenzophenone tetracarboxylic dianhydride, 0.15g bisphenol A dianhydride and 0.55g MoS2. As can be seen from Table 1, its wear diameter is 0.32mm, the friction coefficient is 0.0756, and the anti-wear performance is average.

[0068] Comparative Example 4 is an anti-wear hydraulic oil produced using Example 3 of the Chinese invention patent with publication number CN106947570A and the production process of the present application. As can be seen from Table 1, its wear diameter is 0.36 mm, the friction coefficient is 0.0926, and the anti-wear performance is poor.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. However, any equivalent changes, modifications and evolutions made by ordinary technicians in this field without departing from the scope of the technical solution of the present invention by using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. An anti-wear hydraulic oil, characterized in that: The composition comprises the following raw materials in parts by weight: Base oil: 80-120 parts, modified extreme pressure anti-wear agent: 0.5-3 parts, antioxidant: 2-4 parts, anti-emulsifier: 0.2-0.6 parts, anti-foaming agent: 0.01-0.03 parts, anti-corrosion agent: 0.5-2 parts, rust inhibitor: 1-5 parts; The modified extreme pressure anti-wear agent is prepared by the following method: S1: Under nitrogen protection, DMAc is added to the reaction bottle, and then 2,2'-p-phenylbis-(5-aminobenzimidazole) is slowly added and uniformly dispersed in the DMAc. 3,3',4,4'-dibenzophenone tetracarboxylic dianhydride is slowly added, and the mixture is reacted in an ice-water bath for 4 hours to obtain a light yellow turbid suspension. Bisphenol A dianhydride is then slowly added, and the mixture is reacted in an ice-water bath for 8-12 hours to obtain a viscous polyamic acid solution. Toluene is then added, and the mixture is heated to 130-140°C and reacted for 6-8 hours. The mixture is cooled to room temperature, and then deionized water is added to precipitate a solid precipitate, which is filtered and vacuum-dried to obtain a polyimide powder. S2: Add polyimide powder, MoS2 and deionized water into a high-speed mixer and stir evenly to obtain a modified extreme pressure anti-wear agent; The mass ratio of DMAc, 2,2'-p-phenylbis-(5-aminobenzimidazole), 3,3',4,4'-benzophenone tetracarboxylic dianhydride, and bisphenol A dianhydride is 100:(6-10):(12-16):(3-5); The mass ratio of polyimide powder, MoS2 and deionized water is 5:(2-3):

10.

2. The anti-wear hydraulic oil according to claim 1, characterized in that: The base oil is at least one of GTL III+ base oil and poly α-olefin PAO; the GTL III+ base oil is Shell's GTL420 or GTL430, and the poly α-olefin PAO is Sinopec's PAO4 or PAO6.

3. The anti-wear hydraulic oil according to claim 1, characterized in that: The antioxidant is at least one of 2,6-di-tert-butyl-p-cresol, N,N'-di-sec-butyl-p-phenylenediamine and 2,6-di-tert-butylphenol.

4. The anti-wear hydraulic oil according to claim 1, characterized in that: The anti-emulsifier is a combination of one or more of DL32 polyether polymer compounds and polyethylene oxide-propylene oxide ether.

5. The anti-wear hydraulic oil according to claim 1, characterized in that: The antifoaming agent is one of dimethyl silicone oil and 1# composite defoaming agent.

6. The anti-wear hydraulic oil according to claim 1, characterized in that: The anticorrosive agent is a combination of one or more of T203 phosphorus dioctyl basic zinc salt and N-phenyl-α-naphthylamine.

7. The anti-wear hydraulic oil according to claim 1, characterized in that: The rust preventive agent is a combination of one or more of barium dinonylnaphthalenesulfonate, alkenyl succinic acid, and alkenyl succinate esters.

8. A method for preparing the anti-wear hydraulic oil according to any one of claims 1 to 7, characterized in that: The following steps are involved: (1) Weigh the base oil, modified extreme pressure anti-wear agent, antioxidant, anti-emulsifier, anti-corrosion agent, and rust inhibitor according to the ratio, add them into the reactor, stir evenly, heat to 40-60℃, and stir for 20-40min; (2) Add anti-foaming agent to the above step (1) and continue stirring for 30-50 minutes to obtain high-performance anti-wear hydraulic oil.

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