CN112745981A - Lubricating grease composition containing bentonite and preparation method thereof - Google Patents
Lubricating grease composition containing bentonite and preparation method thereof Download PDFInfo
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- CN112745981A CN112745981A CN201911039626.2A CN201911039626A CN112745981A CN 112745981 A CN112745981 A CN 112745981A CN 201911039626 A CN201911039626 A CN 201911039626A CN 112745981 A CN112745981 A CN 112745981A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/04—Mixtures of base-materials and additives
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
- C10M125/26—Compounds containing silicon or boron, e.g. silica, sand
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/06—Metal compounds
- C10M2201/062—Oxides; Hydroxides; Carbonates or bicarbonates
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/08—Inorganic acids or salts thereof
- C10M2201/081—Inorganic acids or salts thereof containing halogen
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/14—Inorganic compounds or elements as ingredients in lubricant compositions inorganic compounds surface treated with organic compounds
- C10M2201/145—Inorganic compounds or elements as ingredients in lubricant compositions inorganic compounds surface treated with organic compounds used as thickening agents
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
- C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
- C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/08—Aldehydes; Ketones
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/28—Esters
- C10M2207/32—Esters of carbonic acid
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
- C10M2229/04—Siloxanes with specific structure
- C10M2229/041—Siloxanes with specific structure containing aliphatic substituents
- C10M2229/0415—Siloxanes with specific structure containing aliphatic substituents used as base material
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Lubricants (AREA)
Abstract
The invention relates to the field of bentonite lubricating grease, and discloses a lubricating grease composition containing bentonite and a preparation method thereof. The grease composition contains base oil, organic bentonite, inorganic metal salt and optionally a dispersant, wherein the inorganic metal salt is at least one selected from alkali metal carbonate, alkali metal chloride, transition metal carbonate and transition metal chloride; the content of the inorganic metal salt is 8 to 110g per kg of the base oil. The invention also discloses a method for preparing the lubricating grease composition, which comprises the following steps: mixing organic bentonite, inorganic metal salt, dispersant and part of base oil, heating, and mixing with the rest base oil. Through the technical scheme, the wear resistance of the lubricating grease can be effectively improved, and specifically, the lubricating grease composition has higher maximum non-seizure load and sintering load and smaller wear scar diameter.
Description
Technical Field
The invention relates to the field of bentonite lubricating grease, in particular to a lubricating grease composition taking bentonite as a thickening agent and a preparation method thereof.
Background
In recent years, with the development of automation and intellectualization of mechanical equipment, in order to ensure the running precision and reliability of the equipment, more and more parts are integrated in a combined manner, and such parts are more and more difficult to maintain or even impossible to maintain, so that the parts need to be lubricated by grease with better performance and longer service life. Such as sealed hub bearings, small vibrators, small speed reducers and the like, have increased load in the application process, and the lubricating grease is required to have excellent and long-acting extreme pressure wear resistance so as to ensure that the parts can meet the requirements of long-term application.
Among the different grease types, bentonite grease is used as a high dropping point grease, and organic bentonite which is subjected to surface coating treatment by organic amine is used as a thickening agent, so that the special application position and occasions are provided. In order to improve the extreme pressure anti-wear performance of the bentonite grease, a certain content of extreme pressure anti-wear additive is generally required to be added, but due to the structural particularity of the organic bentonite, the extreme pressure anti-wear additive used in other greases has poor effect in the bentonite grease.
For example, CN1045470C employs polytetrafluoroethylene and melamine cyanurate salts as extreme pressure agents; CN107699328A adds di-n-butyl phosphite, dibenzyl molybdenum disulfide, graphite, molybdenum disulfide and other compounds to improve the extreme pressure wear resistance of the bentonite grease; CN102627997A adopts one or more of colloidal graphite, tungsten disulfide, talcum powder, molybdenum disulfide, mica powder, nano calcium carbonate and melamine cyanurate as extreme pressure agent. In CN103468353A, calcium carbonate, calcium acetate, calcium phosphate, copper powder, zinc powder, molybdenum disulfide, tungsten disulfide, cerium trifluoride, graphite and the like are used as extreme pressure antiwear additives.
Although the solid additive can improve the extreme pressure anti-wear performance of the lubricating grease, on one hand, the addition amount is large, and the effect is poor; on the other hand, these additives tend to be costly.
Disclosure of Invention
The invention aims to solve the problems of large addition amount and poor effect in the prior art, and provides a lubricating grease composition containing bentonite and a preparation method thereof.
The inventor of the invention unexpectedly finds that the introduction of the inorganic metal salt into the bentonite grease can effectively improve the extreme pressure wear resistance of the grease, and simultaneously does not affect other properties of the grease. Accordingly, in order to achieve the above object, the present invention provides, in one aspect, a bentonite-containing grease composition comprising a base oil, an organobentonite, an inorganic metal salt and optionally a dispersant, wherein the inorganic metal salt is selected from at least one of an alkali metal carbonate, an alkali metal chloride, a transition metal carbonate and a transition metal chloride; the content of the inorganic metal salt is 8 to 110g per kg of the base oil.
In a second aspect the present invention provides a method of preparing said grease composition, the method comprising: mixing organic bentonite, inorganic metal salt, dispersant and part of base oil, heating, and mixing with the rest base oil.
Through the technical scheme, the wear resistance of the lubricating grease can be effectively improved, and specifically, the lubricating grease composition has higher maximum non-seizure load and sintering load and smaller wear scar diameter.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The bentonite-containing lubricating grease composition comprises base oil, organic bentonite (a thickening agent), inorganic metal salt and a selective dispersant, wherein the inorganic metal salt is at least one selected from alkali metal carbonate, alkali metal chloride, transition metal carbonate and transition metal chloride; the inorganic metal salt is present in an amount of 8 to 110g, preferably 10 to 60g (e.g. 10g, 11g, 15g, 20g, 25g, 30g, 35g, 40g, 45g, 50g, 55g, 59g, 60g or any value therebetween) per kg of base oil.
According to the invention, the inorganic metal salt is a water-soluble inorganic metal salt, i.e. an inorganic metal salt having a solubility at 20 ℃ of more than 1g/100g of water (preferably more than 10g/100g of water). Preferably, the inorganic metal salt is at least one of lithium carbonate, sodium carbonate, potassium carbonate, lithium chloride, sodium chloride, potassium chloride, chromium carbonate, manganese carbonate, iron carbonate, nickel carbonate, copper carbonate, zinc carbonate, chromium chloride, manganese chloride, iron chloride, nickel chloride, copper chloride, and zinc chloride.
According to the present invention, the content of the base oil is not particularly required, and for example, the content of the base oil may be 75 to 97 wt%, preferably 80 to 95 wt% (e.g., 80 wt%, 83 wt%, 84 wt%, 89 wt%, 90 wt%, 92 wt%, 95 wt%, or any value therebetween), based on the total weight of the grease composition.
According to the present invention, the base oil may be various base oils used in greases, such as mineral oils, synthetic oils (silicone oils, olefin oils, and/or ester oils), vegetable oils, or mixtures thereof. Preferably, the base oil has a kinematic viscosity at 100 ℃ of 4 to 100mm2(ii) fats and oils in s. In the present invention, "kinematic viscosity" is measured with reference to GB/T265-1988.
According to the invention, the organobentonite may be present in an amount of 10 to 280g, preferably 70 to 150g (e.g. 70g, 75g, 78g, 80g, 90g, 95g, 100g, 105g, 110g, 115g, 118g, 120g, 128g, 130g, 132g, 135g, 140g, 141g, 142g, 145g, 150g or any value between the aforementioned values) per kg of base oil.
According to the invention, the organic bentonite is bentonite activated by quaternary ammonium salt, such as the organic bentonite produced by Zhejiang Fenghong New materials GmbH.
According to the invention, the dispersant may be present in an amount of from 5 to 280g, preferably from 10 to 30g (e.g. 10g, 11g, 12g, 15g, 20g, 22g, 23g, 24g, 25g, 30g or any value between the above values), per kg of base oil. During the preparation process, part of the dispersant used is generally volatile, and therefore, it will be understood by those skilled in the art that the amount of dispersant used herein refers to: the amount of dispersant raw material used is not the amount in the final product.
According to the invention, the dispersant, i.e. the agent which modifies the structure of the organobentonite and improves its thickening properties, may or may not be present. The dispersant may be water and/or a water-miscible organic solvent (e.g., a lower alcohol, ketone or ester of C1-C6), preferably at least one of methanol, ethanol, water, propylene carbonate, and acetone.
According to the present invention, the grease composition may further contain an auxiliary such as a rust inhibitor, an oiliness agent, and an antioxidant. The antioxidant can further improve the oxidation resistance of the lubricating grease composition, so that the service life of the lubricating grease composition is prolonged, and the antioxidant can be aromatic amine antioxidant, such as at least one of diphenylamine, phenyl-alpha-naphthylamine and diisooctyldiphenylamine. The antioxidant may be present in an amount of 0.01 to 5 wt.%, based on the total weight of the grease composition.
The oiliness agent can further improve the lubricating property of the friction pair surface, and can be higher fatty acid (such as oleic acid and stearic acid), higher alcohol (such as stearyl alcohol), alkylamine (such as phenyltriazolyl stearyl amine) and the like. The content of the oiliness agent may be 0.01 to 4.5% by weight based on the total weight of the grease composition.
The antirust agent can further improve the rust resistance of the lubricating grease composition and can be at least one of barium petroleum sulfonate, sodium petroleum sulfonate, benzothiazole, benzotriazole, zinc naphthenate and alkenyl succinic acid. The rust inhibitor may be contained in an amount of 0.01 to 4.5% by weight, based on the total weight of the grease composition.
According to a preferred embodiment of the present invention, the grease composition consists of only the above-mentioned ingredients.
The method for preparing the lubricating grease composition comprises the following steps: mixing organic bentonite, inorganic metal salt, dispersant and part of base oil, heating, mixing with the rest of base oil, and optionally mixing with auxiliary agent.
More specifically, the method comprises: mixing organic bentonite, inorganic metal salt, dispersant and part of base oil, heating to 120-130 ℃, mixing with the rest base oil, and mixing with optional auxiliary agent. Generally, the mixture finally obtained should also be subjected to a grinding treatment to make the material dispersion more uniform.
In the present invention, in order to further improve the properties of the resulting grease composition, it is preferred that the inorganic metal salt is introduced in the form of an aqueous solution of an inorganic metal salt. The concentration of the aqueous solution of the inorganic metal salt is not particularly limited, and for example, the content of the inorganic metal salt in the aqueous solution of the inorganic metal salt may be 15 to 50% by weight.
In the present invention, the amount of the organobentonite, the inorganic metal salt, the dispersant and the base oil can be selected by those skilled in the art according to the ratio of the organobentonite, the inorganic metal salt, the dispersant and the base oil, and the details thereof will not be described herein. The specific kinds of the inorganic metal salt and the like are also applicable.
The present invention will be described in detail below by way of examples. In the following examples:
mineral oil was purchased from beijing yanshan petrochemical;
olefin oils are available from Exxon Mobil;
silicone oil was purchased from Sichuan Chenguang Chemicals;
the organic bentonite is purchased from Zhejiang Fenghong New materials GmbH;
acetone, propylene carbonate, lithium carbonate, sodium carbonate, potassium carbonate, lithium chloride, sodium chloride, potassium chloride, chromium carbonate, manganese carbonate, iron carbonate, nickel carbonate, copper carbonate, zinc carbonate, chromium chloride, manganese chloride, iron chloride, nickel chloride, copper chloride, and zinc chloride were all purchased from Beijing reagent company.
Example 1
670g of mineral oil 1 (kinematic viscosity at 100 ℃ C. of 10 mm) is added into a reaction kettle2(s), 100g of organic bentonite (trade name HFGEL-310) and 20g of acetone, stirring uniformly, adding 60g of inorganic metal salt aqueous solution (30g of sodium carbonate +130g of water), stirring, heating to 125 +/-5 ℃, adding 200g of mineral oil 1, and grinding the materials by a three-wheel mill to uniformly disperse the materials to obtain a lubricating grease composition sample.
Example 2
670g of olefin oil 1 (kinematic viscosity at 100 ℃ C. of 10 mm) is added into a reaction kettle2(s), 120g of organic bentonite (trade name HFGEL-310) and 20g of acetone, stirring uniformly, adding 40g of inorganic metal salt aqueous solution (10g of lithium carbonate and 30g of water), stirring and heating to 125 +/-5 ℃, adding 200g of olefin oil 1, and grinding the materials by a three-wheel mill to uniformly disperse the materials to obtain a lubricating grease composition sample.
Example 3
640g of silicone oil (kinematic viscosity at 100 ℃ of 60 mm) is added into a reaction kettle2And/s), 110g of organic bentonite (No. FHD-130D) and 20g of propylene carbonate, uniformly stirring, adding 100g of inorganic metal salt aqueous solution (50g of potassium carbonate and 50g of water), stirring, heating to 125 +/-5 ℃, adding 200g of silicone oil, and grinding the materials by a three-wheel mill to uniformly disperse the materials to obtain a lubricating grease composition sample.
Example 4
In the reaction kettle, 690g of mineral oil 2 (kinematic viscosity at 100 ℃ 30 mm) was added2And/s), 70g of organic bentonite (brand BS-1C) and 10g of propylene carbonate, uniformly stirring, adding 100g of inorganic metal salt aqueous solution (20g of lithium carbonate, 20g of sodium carbonate and 60g of water), stirring, heating to 125 +/-5 ℃, adding 200g of mineral oil 2, grinding the materials by a three-wheel mill to uniformly disperse the materials, and preparing a lubricating grease composition sample.
Example 5
In the reaction vessel, 660g of mineral oil 2 (kinematic viscosity at 100 ℃ C. of 30 mm) was charged2(s), 100g of organic bentonite (brand BS-1A) and 20g of propylene carbonate, uniformly stirring, adding 100g of inorganic metal salt aqueous solution (30g of lithium carbonate, 10g of sodium carbonate and 60g of water), stirring, heating to 125 +/-5 ℃, adding 200g of mineral oil, grinding the materials by a three-wheel mill to uniformly disperse the materials, and preparing the lubricating grease compositionAnd (3) sampling.
Example 6
In a reaction vessel, 650g of an olefin oil 2 (kinematic viscosity at 100 ℃ C. of 6 mm) was charged2(s), 120g of organic bentonite (brand FHD-130D) and 20g of acetone, uniformly stirring, adding 100g of inorganic metal salt aqueous solution (30g of sodium carbonate and 70g of water), stirring, heating to 125 +/-5 ℃, adding 200g of olefin oil, and grinding the materials by a three-wheel mill to uniformly disperse the materials to obtain a lubricating grease composition sample.
Example 7
670g of silicone oil (kinematic viscosity at 100 ℃ of 60 mm) is added into a reaction kettle2(s), 90g of organic bentonite (brand HFGEL-310) and 10g of acetone, stirring uniformly, adding 100g of inorganic metal salt aqueous solution (20g of sodium carbonate, 20g of potassium carbonate and 60g of water), stirring and heating to 125 +/-5 ℃, adding 200g of silicone oil, grinding the materials by a three-wheel mill to uniformly disperse the materials, and preparing a lubricating grease composition sample.
Example 8
670g of mineral oil 2 (kinematic viscosity at 100 ℃ C. of 30 mm) is added into the reaction kettle2(s), 80g of organic bentonite (the brand is BS-1A) and 10g of acetone, uniformly stirring, adding 100g of inorganic metal salt aqueous solution (50g of sodium carbonate and 50g of water), stirring, heating to 125 +/-5 ℃, adding 200g of mineral oil, and grinding the materials by a three-wheel mill to uniformly disperse the materials to obtain a lubricating grease composition sample.
Example 9
A grease composition sample was prepared as in example 1, except that sodium carbonate was replaced with sodium chloride.
Example 10
A grease composition sample was prepared as in example 1, except that the sodium carbonate was replaced with ferric chloride.
Example 11
A grease composition sample was prepared as in example 1, except that the sodium carbonate was replaced with copper carbonate.
Example 12
A grease composition sample was prepared as in example 1, except that the sodium carbonate was replaced with zinc carbonate.
Comparative example 1
A grease composition sample was prepared in accordance with the method of example 1, except that 60g of the aqueous inorganic metal salt solution was replaced with 30g of mineral oil.
Comparative example 2
A grease composition sample was prepared as in example 1, except that 60g of the aqueous inorganic metal salt solution was replaced with 30g of molybdenum disulfide.
Comparative example 3
A grease composition sample was prepared in accordance with the method of example 1, except that 60g of an aqueous inorganic metal salt solution (30g of sodium carbonate +30g of water) was replaced with 35g of an aqueous sodium carbonate solution (5g of sodium carbonate +30g of water).
Comparative example 4
A grease composition sample was prepared in accordance with the method of example 1, except that 60g of the aqueous inorganic metal salt solution was replaced with 30g of calcium carbonate.
Comparative example 5
A grease composition sample was prepared as in example 1, except that sodium carbonate was replaced with sodium sulfate.
Comparative example 6
A grease composition sample was prepared as in example 1, except that sodium carbonate was replaced with sodium phosphate.
Comparative example 7
A sample of grease composition was prepared in accordance with the procedure of example 1, except that 60g of an aqueous solution of an inorganic metal salt (30g of sodium carbonate +30g of water) was replaced with 260g of an aqueous solution of sodium carbonate (100g of sodium carbonate +160g of water).
Comparative example 8
670g of mineral oil 1 (kinematic viscosity at 100 ℃ C. of 10 mm) is added into a reaction kettle2(s), 100g of organic bentonite (trade name HFGEL-310) and 20g of acetone, stirring uniformly, adding 60g of inorganic metal salt aqueous solution (10g of sodium phosphate and 50g of water), stirring and heating to 125 +/-5 ℃, adding 220g of mineral oil 1, and grinding the materials by a three-wheel mill to uniformly disperse the materials to obtain a lubricating grease composition sample.
Test example 1
The physical and chemical properties of the grease composition samples obtained in the above examples and comparative examples were analyzed as follows:
penetration (25 ℃, 0.1mm, 60 times): GB/T269-1991, the smaller the cone penetration is in 60 times of work, which indicates that the thickening capacity is stronger;
dropping point: GB/T3498-;
extreme pressure Properties (maximum non-seizure load, P)BValue): SH/T0202-;
extreme pressure Properties (sintering load, P)DValue): SH/T0202-;
abrasion resistance (d value): SH/T0204-;
coefficient of friction (f value): SH/T0204-.
Wherein, PBValue sum PDThe larger the value is, the smaller the value d is, the stronger the extreme pressure wear resistance is; the smaller the f-number, the better the lubricating property.
The results are shown in Table 1.
TABLE 1
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. A bentonite-containing grease composition comprising a base oil, an organic bentonite, an inorganic metal salt and optionally a dispersant, wherein the inorganic metal salt is at least one selected from the group consisting of an alkali metal carbonate, an alkali metal chloride, a transition metal carbonate and a transition metal chloride; the content of the inorganic metal salt is 8 to 110g per kg of the base oil.
2. Grease composition according to claim 1, wherein the content of inorganic metal salt is 10-60g per kg of base oil.
3. A grease composition according to claim 1 or 2, wherein the inorganic metal salt is at least one of lithium carbonate, sodium carbonate, potassium carbonate, lithium chloride, sodium chloride, potassium chloride, chromium carbonate, manganese carbonate, iron carbonate, nickel carbonate, copper carbonate, zinc carbonate, chromium chloride, manganese chloride, iron chloride, nickel chloride, copper chloride and zinc chloride.
4. Grease composition according to claim 1, wherein the base oil is present in an amount of 75-97 wt.%, preferably 80-95 wt.%, based on the total weight of the grease composition.
5. A grease composition according to claim 1 or 4, wherein the base oil has a kinematic viscosity at 100 ℃ of 4-100mm2/s。
6. Grease composition according to claim 1, wherein the content of organobentonite is between 10 and 280g, preferably between 70 and 150g, per kg of base oil.
7. Grease composition according to claim 1, wherein the dispersant is present in an amount of 5-280g, preferably 10-30g, per kg of base oil.
8. Grease composition according to claim 1 or 7, wherein the dispersant is water and/or a water-miscible organic solvent, preferably at least one of methanol, ethanol, water, propylene carbonate and acetone.
9. A method of preparing a grease composition according to any one of claims 1-8, characterized in that the method comprises: mixing organic bentonite, inorganic metal salt, dispersant and part of base oil, heating, and mixing with the rest base oil.
10. The method of claim 9, wherein the inorganic metal salt is introduced in the form of an aqueous inorganic metal salt solution;
preferably, the content of the inorganic metal salt in the aqueous solution of the inorganic metal salt is 15 to 50% by weight.
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| CN113372978A (en) * | 2021-05-28 | 2021-09-10 | 中国石油化工股份有限公司 | Lubricating grease composition for high-temperature food machinery and preparation method and application thereof |
| CN113403127A (en) * | 2021-06-08 | 2021-09-17 | 郑州市欧普士科技有限公司 | Environment-friendly anti-corrosion grease for overhead conductor and preparation method thereof |
| CN116024028A (en) * | 2021-10-25 | 2023-04-28 | 中国石油化工股份有限公司 | Grease composition, preparation method thereof and application of trifluoroacetate and fatty alcohol |
| CN116042288A (en) * | 2021-10-28 | 2023-05-02 | 中国石油化工股份有限公司 | Grease composition, preparation method thereof and application of pyrimidine compound and fatty alcohol |
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| CN116024028A (en) * | 2021-10-25 | 2023-04-28 | 中国石油化工股份有限公司 | Grease composition, preparation method thereof and application of trifluoroacetate and fatty alcohol |
| CN116042288A (en) * | 2021-10-28 | 2023-05-02 | 中国石油化工股份有限公司 | Grease composition, preparation method thereof and application of pyrimidine compound and fatty alcohol |
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