High-temperature-resistant and anti-corrosion lubricating grease special for air cylinder and preparation method of lubricating grease

Abstract

The invention relates to the technical field of lubricating grease, and discloses high-temperature-resistant and anti-corrosion lubricating grease special for air cylinders and a preparation method thereof.The lubricating grease is prepared from 30-45 parts of lubricating oil, 20-25 parts of base oil and 10-15 parts of additives; the invention further provides the high-temperature-resistant and anti-corrosion lubricating grease special for the air cylinder and a preparation method of the lubricating grease, and the preparation method comprises the following steps: S1, mixing: dropwise adding the gallium-based liquid metal into the base oil, and stirring and mixing in the dropwise adding process to obtain a mixture A; the silicon-based lubricating grease not only retains the advantage of high adhesiveness of a silicon base, overcomes the defect that the silicon base is easy to form precipitates, can run for a long time in an environment of 50-300 DEG C, has high adhesiveness, prolongs the service life, can be suitable for various working conditions from low load to high load, and can meet the lubrication requirements of high-temperature working conditions such as watery and humid conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of greases, and specifically to a special grease for cylinders with high temperature resistance and corrosion prevention and a preparation method thereof. Background Art

[0002] Grease can adhere to a vertical surface without flowing at normal temperature and can work in friction parts with open or poor sealing, having characteristics that cannot be replaced by other lubricants. Therefore, grease is used as a lubricating material in many parts of automobiles and construction machinery.

[0003] Traditional grease is prepared by adding grease or fatty acid to inorganic base to prepare metal soap as a thickener or using organic or inorganic thickeners and adding mineral oil or synthetic oil for processing and thickening. It mainly stores mineral oil or synthetic oil within the framework formed by the thickener. Under the action of moving pressure and temperature, the oil stored in the thickener escapes to play a lubricating role, showing a paste-like physical property at normal temperature and pressure. However, under high-temperature conditions, it is difficult to maintain a long-term corrosion resistance effect, resulting in premature scrapping of transmission parts such as bearings and gears. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] Aiming at the deficiencies of the prior art, the present invention provides a special grease for cylinders with high temperature resistance and corrosion prevention and a preparation method thereof, mainly to solve the problem that existing grease is difficult to maintain a long-term corrosion resistance effect under high-temperature conditions, resulting in premature scrapping of transmission parts such as bearings and gears.

[0006] (2) Technical Solutions

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A special grease for cylinders with high temperature resistance and corrosion prevention, the raw materials including: 30 - 45 parts of lubricating oil, 20 - 25 parts of base oil, 10 - 15 parts of additives, 9 - 12 parts of gallium-based liquid metal, 3 - 6 parts of thickener, and 2 - 5 parts of polar dispersant.

[0009] Further, the lubricating oil is any one of Shell lubricating oil, Great Wall lubricating oil, Mobil lubricating oil, Castrol lubricating oil, or Kunlun lubricating oil.

[0010] On the basis of the foregoing solution, the base oil is any one of mineral oil or synthetic oil, and the additives are silicon-based and fluorine-based.

[0011] As a further solution of the present invention, the mineral oil is any one of low-sulfur paraffinic crude oil base oil, low-sulfur intermediate base oil and naphthenic crude oil base oil, and the synthetic oil is any one of synthetic hydrocarbon oil, ester oil, ether oil, silicone oil and fluorine oil.

[0012] Further, the thickener is any one of organic bentonite, urea, soap, lithium soap, sodium soap, calcium complex soap, lithium complex soap or calcium sulfonate complex soap.

[0013] The present invention also provides a special lubricating grease for cylinders with high temperature resistance and corrosion prevention and a preparation method thereof, including the following steps:

[0014] S1: Mixing, adding gallium-based liquid metal drop by drop to the base oil, and stirring and mixing during the dropping process to obtain a mixture A;

[0015] S2: Refining, mixing the mixture A and the thickener, reacting at 65-95°C for 10-60 minutes, continuing to heat up to 190-220°C for high-temperature refining, then adding a polar dispersant, cooling to 100-150°C, and then adding silicon-based and fluorine-based in sequence, and cooling to 60-90°C to obtain a viscous material;

[0016] S3: Grinding, after removing moisture from the viscous material in S2 under reduced pressure, adding it to a grinder, and grinding at a rotation speed of 1000-1500 r / min for 20-25 minutes to obtain lubricating grease;

[0017] S4: Adding lubricating oil, adding the lubricating grease in S5 as an additive to the lubricating oil for mixing to obtain solid lubricating grease.

[0018] On the basis of the foregoing solution, the mass ratio of the lubricating oil to the lubricating grease in S4 is 45-50∶100-150.

[0019] As a further solution of the present invention, the polar dispersant is any one of acetone or propylene carbonate, and the gallium-based liquid metal is pure gallium or a mixture of gallium and at least one of indium, tin and zinc.

[0020] (III) Beneficial effects

[0021] Compared with the prior art, the present invention provides a special lubricating grease for cylinders with high temperature resistance and corrosion prevention and a preparation method thereof, having the following beneficial effects:

[0022] 1. By adding silicon-based and fluorine-based as additives to the lubricating grease, the present invention retains the high temperature resistance advantage of the fluorine-based and removes the disadvantage of the fluorine-based being easy to corrode fluororubber, retains the high adhesion advantage of the silicon-based, and removes the disadvantage of the silicon-based being easy to form precipitation. It can operate for a long time in an environment of 50 to 300°C, has high adhesion, and improves the service life of the lubricating grease.

[0023] 2. The grease prepared by adding gallium-based liquid metal in the present invention is non-toxic, non-irritating, and non-corrosive. Under high load conditions, it can achieve excellent extreme pressure performance comparable to that of gallium-based liquid metal, while the cost can be reduced to less than one-tenth of that of gallium-based liquid metal, and its anti-wear performance under low load conditions is significantly better than that of gallium-based liquid metal, making it suitable for various working conditions from low load to high load.

[0024] 3. The grease provided by the present invention has excellent high-temperature performance, and at the same time has excellent water resistance, colloidal stability, and rust and corrosion prevention performance, and can meet the lubrication requirements of high-temperature working conditions such as multi-water and humid environments. Description of the Drawings

[0025] Figure 1 It is a schematic flow structure diagram of a special grease for cylinders with high temperature resistance and corrosion prevention and its preparation method proposed by the present invention. Detailed Embodiments

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0027] Embodiment 1

[0028] Refer to Figure 1 , a special grease for cylinders with high temperature resistance and corrosion prevention, the raw materials include: 30 parts of lubricating oil, 20 parts of base oil, 10 parts of additives, 9 parts of gallium-based liquid metal, 3 parts of thickener, and 2 parts of polar dispersant. The grease prepared by adding gallium-based liquid metal is non-toxic, non-irritating, and non-corrosive. Under high load conditions, it can achieve excellent extreme pressure performance comparable to that of gallium-based liquid metal, while the cost can be reduced to less than one-tenth of that of gallium-based liquid metal, and its anti-wear performance under low load conditions is significantly better than that of gallium-based liquid metal, making it suitable for various working conditions from low load to high load.

[0029] In the present invention, the lubricating oil is Kunlun lubricating oil, the base oil is mineral oil, the additives are silicon-based and fluorine-based, the mineral oil is low-sulfur intermediate-base base oil, and the thickener is lithium complex soap.

[0030] The present invention also proposes a special grease for cylinders with high temperature resistance and corrosion prevention and its preparation method, including the following steps:

[0031] S1: Mixing, adding gallium-based liquid metal drop by drop into the base oil, and stirring and mixing during the dropping process to obtain mixture A;

[0032] S2: Refining. Mix the mixture A and the thickener, react at 95°C for 10 min, continue to heat up to 190°C for high-temperature refining, then add the polar dispersant, cool down to 100°C, and then add the silicon-based and fluorine-based components in sequence. After cooling to 60°C, a viscous material is obtained. By adding the silicon-based and fluorine-based components as additives to the grease, the heat-resistant advantage of the fluorine-based component is retained, the disadvantage of the fluorine-based component being prone to corroding fluororubber is removed, the high adhesion advantage of the silicon-based component is retained, and the disadvantage of the silicon-based component being prone to forming precipitation is removed. It can operate for a long time in an environment of 250°C, has high adhesion, and improves the service life of the grease.

[0033] S3: Grinding. After removing the moisture from the viscous material in S2 under reduced pressure, add it to a grinding machine and grind for 20 min at a rotation speed of 1500 r / min to obtain the grease.

[0034] S4: Adding lubricating oil. Add the grease in S5 as an additive to the lubricating oil for mixing to obtain a solid grease.

[0035] In particular, in S4, the mass ratio of the lubricating oil to the grease is 45:100, the polar dispersant is acetone, and the gallium-based liquid metal is a mixture of gallium and tin.

[0036] Example Two

[0037] Refer to Figure 1 , a special grease for cylinders with high temperature resistance and corrosion prevention, the raw materials include: 40 parts of lubricating oil, 22 parts of base oil, 11 parts of additive, 10 parts of gallium-based liquid metal, 4 parts of thickener, and 3 parts of polar dispersant. The grease prepared by adding gallium-based liquid metal is non-toxic, non-irritating, and non-corrosive. Under high load conditions, it can achieve excellent extreme pressure performance equivalent to that of gallium-based liquid metal, while the cost can be reduced to less than one-tenth of that of gallium-based liquid metal, and its anti-wear performance under low load conditions is significantly better than that of gallium-based liquid metal, and it is suitable for various working conditions from low load to high load.

[0038] In the present invention, the lubricating oil is Mobil lubricating oil, the base oil is synthetic oil, the additive is silicon-based and fluorine-based, the synthetic oil is ether oil, and the thickener is urea.

[0039] The present invention also proposes a special grease for cylinders with high temperature resistance and corrosion prevention and its preparation method, including the following steps:

[0040] S1: Mixing. Dropwise add the gallium-based liquid metal into the base oil and stir and mix during the dropping process to obtain the mixture A.

[0041] S2: Refining, mix the mixture A and the thickener, react at 75°C for 40 min, continue to heat up to 200°C for high-temperature refining, then add the polar dispersant, cool down to 145°C and then add the silicon-based and fluorine-based components in sequence, and cool to 70°C to obtain a viscous material. By adding the silicon-based and fluorine-based components as additives to the grease, the heat-resistant advantage of the fluorine-based component is retained while the disadvantage of the fluorine-based component being prone to corroding fluororubber is removed, and the high adhesion advantage of the silicon-based component is retained while the disadvantage of the silicon-based component being prone to forming precipitation is removed. It can operate continuously in an environment of 200°C, has high adhesion, and improves the service life of the grease;

[0042] S3: Grinding, after removing moisture from the viscous material in S2 under reduced pressure, add it to a grinder and grind at a rotational speed of 1250 r / min for 23 min to obtain the grease;

[0043] S4: Add lubricating oil, add the grease in S5 as an additive to the lubricating oil and mix to obtain a solid grease.

[0044] In particular, in S4, the mass ratio of the lubricating oil to the grease is 47:120, the polar dispersant is propylene carbonate, and the gallium-based liquid metal is a mixture of gallium and indium.

[0045] Example 3

[0046] Refer to Figure 1 , a special grease for high-temperature resistant and corrosion-proof cylinders, the raw materials include: 45 parts of lubricating oil, 25 parts of base oil, 15 parts of additives, 12 parts of gallium-based liquid metal, 6 parts of thickener, and 5 parts of polar dispersant. The grease prepared by adding gallium-based liquid metal is non-toxic, non-irritating, and non-corrosive, and can achieve excellent extreme pressure performance equivalent to that of gallium-based liquid metal under high load conditions, while the cost can be reduced to less than one-tenth of that of gallium-based liquid metal, and its anti-wear performance under low load conditions is significantly better than that of gallium-based liquid metal, suitable for various working conditions from low load to high load.

[0047] In the present invention, the lubricating oil is of the Shell lubricating oil type, the base oil is mineral oil, the additives are silicon-based and fluorine-based, the mineral oil is a low-sulfur paraffin-based crude oil base oil, and the thickener is organobentonite.

[0048] The present invention also provides a special grease for high-temperature resistant and corrosion-proof cylinders and its preparation method, including the following steps:

[0049] S1: Mixing, dropwise add the gallium-based liquid metal into the base oil and stir and mix during the dropping process to obtain mixture A;

[0050] S2: Refining. Mix the mixture A and the thickener, react at 65°C for 60 minutes, continue to heat up to 220°C for high-temperature refining, then add a polar dispersant, cool down to 150°C and then add the silicon-based and fluorine-based components in sequence, and cool to 90°C to obtain a viscous material. By adding the silicon-based and fluorine-based components as additives to the grease, the heat-resistant advantage of the fluorine-based component is retained while the disadvantage of the fluorine-based component being prone to corroding fluororubber is removed, the high adhesion advantage of the silicon-based component is retained, and the disadvantage of the silicon-based component being prone to forming precipitation is removed. It can operate continuously in an environment of 300°C, has high adhesion, and improves the service life of the grease.

[0051] S3: Grinding. After removing the moisture from the viscous material in S2 under reduced pressure, add it to a grinder and grind at a rotational speed of 1000 r / min for 25 minutes to obtain the grease.

[0052] S4: Adding lubricating oil. Add the grease in S5 as an additive to the lubricating oil for mixing to obtain a solid grease.

[0053] In particular, in S4, the mass ratio of the lubricating oil to the grease is 50:150, the polar dispersant is acetone, and the gallium-based liquid metal is pure gallium.

[0054] In the description of this article, it should be noted that relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

Claims

1. A special lubricating grease for cylinders with high temperature resistance and corrosion prevention, characterized in that, The raw materials include: 30 - 45 parts of lubricating oil, 20 - 25 parts of base oil, 10 - 15 parts of additive, 9 - 12 parts of gallium-based liquid metal, 3 - 6 parts of thickener, and 2 - 5 parts of polar dispersant.

2. The special lubricating grease for cylinders with high temperature resistance and corrosion prevention according to claim 1, characterized in that, The lubricating oil is any one of Shell lubricating oil, Great Wall lubricating oil, Mobil lubricating oil, Castrol lubricating oil, or Kunlun lubricating oil.

3. The special lubricating grease for cylinders with high temperature resistance and corrosion prevention according to claim 1, characterized in that, The base oil is any one of mineral oil or synthetic oil, and the additive is silicon-based and fluorine-based.

4. The special lubricating grease for cylinders with high temperature resistance and corrosion prevention according to claim 3, characterized in that, The mineral oil is any one of low-sulfur paraffinic crude oil base oil, low-sulfur intermediate base oil, and naphthenic crude oil base oil, and the synthetic oil is any one of synthetic hydrocarbon oil, ester oil, ether oil, silicone oil, and fluorine oil.

5. A special lubricating grease for cylinders with high temperature resistance and corrosion prevention according to claim 4, characterized in that, The thickener is any one of organic bentonite, urea, soap, lithium soap, sodium soap, calcium complex soap, lithium complex soap, or calcium sulfonate complex soap.

6. A special lubricating grease for cylinders with high temperature resistance and corrosion prevention and its preparation method, characterized in that, It includes the following steps: S1: Mixing, adding the gallium-based liquid metal drop by drop into the base oil, and stirring and mixing during the dropping process to obtain mixture A. S2: Refining, mixing mixture A and the thickener, reacting at 65 - 95 °C for 10 - 60 min, continuously heating to 190 - 220 °C for high-temperature refining, then adding the polar dispersant, cooling to 100 - 150 °C, and then adding silicon-based and fluorine-based in sequence, and cooling to 60 - 90 °C to obtain a viscous material. S3: Grinding, after removing the moisture from the viscous material in S2 under reduced pressure, adding it to a grinding machine, and grinding at a rotational speed of 1000 - 1500 r / min for 20 - 25 min to obtain grease. S4: Adding lubricating oil, adding the grease in S5 as an additive to the lubricating oil for mixing to obtain solid grease.

7. A special lubricating grease for cylinders with high temperature resistance and corrosion prevention and its preparation method according to claim 6, characterized in that, In S4, the mass ratio of the lubricating oil to the grease is 45 - 50:100 - 150.

8. A special lubricating grease for cylinders with high temperature resistance and corrosion prevention and its preparation method according to claim 6, characterized in that, The polar dispersant is any one of acetone or propylene carbonate, and the gallium-based liquid metal is pure gallium or a mixture of gallium and at least one of indium, tin, and zinc.

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