CN109054965A - A kind of low noise compositing lithio ester - Google Patents
A kind of low noise compositing lithio ester Download PDFInfo
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- CN109054965A CN109054965A CN201810761683.0A CN201810761683A CN109054965A CN 109054965 A CN109054965 A CN 109054965A CN 201810761683 A CN201810761683 A CN 201810761683A CN 109054965 A CN109054965 A CN 109054965A
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- low noise
- stearic acid
- oil
- compositing lithio
- antioxidant
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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
- C10M169/06—Mixtures of thickeners and additives
-
- 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
- C10M177/00—Special methods of preparation of lubricating compositions; Chemical modification by after-treatment of components or of the whole of a lubricating composition, not covered by other classes
-
- 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
- C10M2201/087—Boron oxides, acids or salts
-
- 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
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/126—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic
- C10M2207/1265—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic used as thickening agent
-
- 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
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/128—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof
- C10M2207/1285—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof used as thickening agents
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/08—Resistance to extreme temperature
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/76—Reduction of noise, shudder, or vibrations
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/02—Bearings
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Lubricants (AREA)
Abstract
The present invention relates to a kind of lubricating grease, and in particular to a kind of low noise compositing lithio ester.A kind of low noise compositing lithio ester, its raw material includes: stearic acid lithium soap and 12 hydroxy stearic acid lithium soaps as mass fraction: 13% ~ 15%, base oil (Esters oil/ethers oil): and 70% ~ 80%, antioxidant: 1% ~ 5%, antirust agent: 1% ~ 5%, boric acid spirit solution: 0.5% ~ 3%.Lithium saponify of the invention is by being added boric acid spirit solution, and high-temperature behavior is excellent, and low noise properties are good, and under the conditions of 165 DEG C, the service life of lithium saponify of the present invention is 2 ~ 4 times of lithium saponify；It is suitble to the motor bearings application of the low noise properties in wide temperature range.
Description
Technical field
The present invention relates to a kind of lubricating grease, and in particular to a kind of low noise compositing lithio ester.
Background technique
Currently, the developmental research with lubricating grease is more and more, it is mainly reflected in the long-life, high/low temperature is adapted to, is high/low
Fast use, low noise etc..And the exploitation about low-noise lubricating grease has become external popular research direction, it is domestic at present right
This research report is less.Traditional complex lithium grease possesses outstanding high-temperature behavior, but is in terms of low noise properties
Very poor, on the contrary, lithium saponify possesses outstanding low noise properties, but in 150 DEG C of high temperature or it is greater than 150 DEG C of situations, resistance to height
Warm poor performance.
Summary of the invention
The purpose of the present invention is to provide a kind of low noise compositing lithio esters.The present invention is by adding special additive boron
Acid is dissolved in alcohol (60 ~ 80 DEG C), prepares NEW TYPE OF COMPOSITE lithium base, by processing, obtains the excellent compound lithium base of low noise properties
Rouge, high temperature resistance is excellent, and service life is 2 ~ 4 times of common lithium soap base.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of low noise compositing lithio ester, raw material include: as mass fraction
Stearic acid lithium soap and 12 hydroxy stearic acid lithium soaps: 13% ~ 15%；
Base oil: 70% ~ 80%；
Antioxidant: 1% ~ 5%；
Antirust agent: 1% ~ 5%；
Boric acid spirit solution: 0.5% ~ 3%.
Wherein the mass ratio of stearic acid lithium soap and 12 hydroxy stearic acid lithium soaps is 1:4.
The base oil is one or more of Esters oil, ethers oil, mineral oil, synthetic hydrocarbon oil.
Wherein antioxidant be octyl diphenylamine, butyl diphenylamines, di-iso-octyldiphenylamine, phenolic ester, alkyl phenyl amine one
Kind is a variety of.
Wherein antirust agent is one of calcium mahogany sulfonate, barium mahogany sulfonate, sorbester p17 or a variety of.
Wherein the mass fraction of boric acid is 0.5% ~ 3% in boric acid spirit solution.
A kind of method of the low noise compositing lithio ester, comprising the following steps:
(1) lithium hydroxide is mixed with stearic acid, 12 hydroxy stearic acids and base oil, is reacted 1 hour under the conditions of 100 ~ 130 DEG C
(wherein stearic acid lithium soap and 12 hydroxy stearic acid lithium soaps is prepared in process)；
(2) 220 ~ 230 DEG C are continuously heating to, 15min is stirred；
(3) reconciliation kettle is gone to be cooled down；
(4) boric acid spirit solution and antioxidant, antirust agent is added；
(5) it is ground 2 times with triple-roller mill；
(6) it is filtered and deaerates.
Remarkable advantage of the invention is:
(1) after boric acid spirit solution is added in lithium saponify of the invention, high-temperature behavior (dropping point) and compositing lithio ester are close and low
Noise performance is good, and under the conditions of 165 DEG C, the service life of lithium saponify of the present invention is 2 ~ 4 times of lithium saponify；
(2) long-life that lithium saponify of the present invention is suitable for wide temperature range (predominantly Esters oil) lubricates；
(3) lithium saponify of the present invention is suitable for the motor bearings of the low noise properties in wide temperature range, and application is in the car,
The bearing application that high temperature can be suitble to work long hours with low noise properties.
Detailed description of the invention
Fig. 1 is 1 sample microscope particle picture of comparative example；
Fig. 2 is 2 sample microscope particle picture of comparative example；
Fig. 3 is 3 sample microscope particle picture of comparative example；
Fig. 4 is 4 sample microscope particle picture of comparative example；
Fig. 5 is 1 sample microscope particle picture of embodiment；
Fig. 6 is 2 sample microscope particle picture of embodiment；
Fig. 7 is 3 sample microscope particle picture of embodiment；
Fig. 8 is low noise test result (decibel value)；A, B, C, D, E, F, G are followed successively by comparative example 1, comparative example 2, comparative example in figure
3, comparative example 4, embodiment 1, embodiment 2, embodiment 3；
Fig. 9 is BVT bear vibration intermediate frequency test result；A, B, C, D, E, F, G are followed successively by comparative example 1, comparative example 2, compare in figure
Example 3, comparative example 4, embodiment 1, embodiment 2, embodiment 3；
Figure 10 is BVT bear vibration high-frequency test result；A, B, C, D, E, F, G are followed successively by comparative example 1, comparative example 2, compare in figure
Example 3, comparative example 4, embodiment 1, embodiment 2, embodiment 3.
Specific embodiment
Further to disclose rather than the present invention is limited, the present invention is described in further detail below in conjunction with example.
Embodiment 1
A kind of low noise compositing lithio ester, raw material include: as mass fraction
Stearic acid lithium soap and 12 hydroxy stearic acid lithium soaps: 13%, (the wherein quality of stearic acid lithium soap and 12 hydroxy stearic acid lithium soaps
Than for 1:4),
Base oil (Esters oil/ethers oil): 77.5%,
Antioxidant: 2%,
Antirust agent: 4.5%,
Boric acid spirit solution: 3%.
A kind of preparation method of the low noise compositing lithio ester, comprising the following steps:
(1) lithium hydroxide and stearic acid, 12 hydroxy stearic acids and base oil are mixed, it is small that 1 is reacted under the conditions of 100 ~ 130 DEG C
When；
(2) 220 ~ 230 DEG C are continuously heating to, 15min is stirred；
(3) reconciliation kettle is gone to be cooled down；
(4) 3wt% boric acid spirit solution and antioxidant, antirust agent is added；
(5) it is ground 2 times with triple-roller mill；
(6) it is filtered and deaerates.
Wherein antioxidant is di-iso-octyldiphenylamine, and antirust agent is sorbester p17.
Embodiment 2
A kind of low noise compositing lithio ester, raw material include: as mass fraction
Stearic acid lithium soap and 12 hydroxy stearic acid lithium soaps: 13%, (the wherein quality of stearic acid lithium soap and 12 hydroxy stearic acid lithium soaps
Than for 1:4),
Base oil (Esters oil/ethers oil): 79.5%,
Antioxidant: 2%,
Antirust agent: 4.5%,
Boric acid spirit solution: 1%.
A kind of preparation method of the low noise compositing lithio ester, comprising the following steps:
(1) lithium hydroxide is mixed with stearic acid, 12 hydroxy stearic acids and base oil, it is small that 1 is reacted under the conditions of 100 ~ 130 DEG C
When；
(2) 220 ~ 230 DEG C are continuously heating to, 15min is stirred；
(3) reconciliation kettle is gone to be cooled down；
(4) 1wt% boric acid spirit solution and antioxidant, antirust agent is added；
(5) it is ground 2 times with triple-roller mill；
(6) it is filtered and deaerates.
Wherein antioxidant is di-iso-octyldiphenylamine, and antirust agent is sorbester p17.
Embodiment 3
A kind of low noise compositing lithio ester, raw material include: as mass fraction
Stearic acid lithium soap and 12 hydroxy stearic acid lithium soaps: 13%, (the wherein quality of stearic acid lithium soap and 12 hydroxy stearic acid lithium soaps
Than for 1:4),
Base oil (Esters oil/ethers oil): 80%,
Antioxidant: 2%,
Antirust agent: 4.5%,
Boric acid spirit solution: 0.5%.
A kind of preparation method of the low noise compositing lithio ester, comprising the following steps:
(1) lithium hydroxide and stearic acid, 12 hydroxy stearic acids and base oil are mixed, it is small that 1 is reacted under the conditions of 100 ~ 130 DEG C
When；
(2) 220 ~ 230 DEG C are continuously heating to, 15min is stirred；
(3) reconciliation kettle is gone to be cooled down；
(4) 0.5wt% boric acid spirit solution and antioxidant, antirust agent is added；
(5) it is ground 2 times with triple-roller mill；
(6) it is filtered and deaerates.
Wherein antioxidant is di-iso-octyldiphenylamine, and antirust agent is sorbester p17.
Comparative example
Comparative example 1
Stearic acid lithium soap and 12 hydroxy stearic acid lithium soaps: 13%, (the wherein quality of stearic acid lithium soap and 12 hydroxy stearic acid lithium soaps
Than for 1:4),
Base oil (Esters oil/ethers oil): 80.5%,
Antioxidant: 2%,
Antirust agent: 4.5%,
The preparation method of the lithium saponify, comprising the following steps:
(1) lithium hydroxide and stearic acid, 12 hydroxy stearic acids and base oil are mixed, it is small that 1 is reacted under the conditions of 100 ~ 130 DEG C
When；
(2) 220 ~ 230 DEG C are continuously heating to, 15min is stirred；
(3) reconciliation kettle is gone to be cooled down；
(4) antioxidant, antirust agent is added；
(5) it is ground 2 times with triple-roller mill；
(6) it is filtered and deaerates.
Wherein antioxidant is di-iso-octyldiphenylamine, and antirust agent is sorbester p17.
Comparative example 2
Stearic acid lithium soap/12 hydroxy stearic acid lithium soaps: 13%, (the wherein mass ratio of stearic acid lithium soap and 12 hydroxy stearic acid lithium soaps
For 3:7),
Base oil (Esters oil/ethers oil): 80.5%,
Antioxidant: 2%,
Antirust agent: 4.5%,
The preparation method of the lithium saponify, comprising the following steps:
(1) lithium hydroxide and stearic acid, 12 hydroxy stearic acids and base oil are mixed, it is small that 1 is reacted under the conditions of 100 ~ 130 DEG C
When；
(2) 220 ~ 230 DEG C are continuously heating to, 15min is stirred；
(3) reconciliation kettle is gone to be cooled down；
(4) antioxidant, antirust agent is added；
(5) it is ground 2 times with triple-roller mill；
(6) it is filtered and deaerates.
Wherein antioxidant is di-iso-octyldiphenylamine, and antirust agent is sorbester p17.
Comparative example 3
Decanedioic acid lithium soap/12 hydroxy stearic acid lithium soaps: 13%, (the wherein mass ratio of decanedioic acid lithium soap and 12 hydroxy stearic acid lithium soaps
For 1:4),
Base oil (Esters oil/ethers oil): 80.5%,
Antioxidant: 2%,
Antirust agent: 4.5%,
The preparation method of the compositing lithio ester, comprising the following steps:
(1) lithium hydroxide and decanedioic acid, 12 hydroxy stearic acids and base oil are mixed, it is small that 1 is reacted under the conditions of 100 ~ 130 DEG C
When；
(2) 220 ~ 230 DEG C are continuously heating to, 15min is stirred；
(3) reconciliation kettle is gone to be cooled down；
(4) antioxidant, antirust agent is added；
(5) it is ground 2 times with triple-roller mill；
(6) it is filtered and deaerates.
Wherein antioxidant is di-iso-octyldiphenylamine, and antirust agent is sorbester p17.
Comparative example 4
Stearic acid lithium soap/12 hydroxy stearic acid lithium soaps: 13%, (the wherein mass ratio of stearic acid lithium soap and 12 hydroxy stearic acid lithium soaps
For 1:4),
Base oil (Esters oil/ethers oil): 77.5%,
Antioxidant: 2%,
Antirust agent: 4.5%,
Boric acid solution: 3%
The preparation method of the compositing lithio ester, comprising the following steps:
(1) it by lithium hydroxide and stearic acid, 12 hydroxy stearic acids, is mixed with base oil, it is small that 1 is reacted under the conditions of 100 ~ 130 DEG C
When；
(2) 220 ~ 230 DEG C are continuously heating to, 15min is stirred；
(3) reconciliation kettle is gone to be cooled down；
(4) 3wt% boric acid aqueous solution antioxidant, antirust agent is added；
(5) it is ground 2 times with triple-roller mill；
(6) it is filtered and deaerates.
Wherein antioxidant is di-iso-octyldiphenylamine, and antirust agent is sorbester p17.
1 embodiment of the present invention of table is compared with comparative example properties of product
As can be seen from Table 1, the compositing lithio ester low noise properties that the embodiment of the present invention 1 ~ 3 is prepared are good, high temperature resistant
Service life is long.It is fine to can reflect out its low noise properties from Fig. 8,9,10.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, is all covered by the present invention.
Claims (7)
1. a kind of low noise compositing lithio ester, it is characterised in that: its raw material components includes: as mass fraction
Stearic acid lithium soap and 12 hydroxy stearic acid lithium soaps: 13% ~ 15%；
Base oil: 70% ~ 80%；
Antioxidant: 1% ~ 5%；
Antirust agent: 1% ~ 5%；
Boric acid spirit solution: 0.5% ~ 3%.
2. a kind of low noise compositing lithio ester according to claim 1, it is characterised in that: wherein stearic acid lithium soap and 12 hydroxyls
The mass ratio of base stearic acid lithium soap is 1:4.
3. a kind of low noise compositing lithio ester according to claim 1, it is characterised in that: the base oil be Esters oil,
One or more of ethers oil, mineral oil, synthetic hydrocarbon oil.
4. a kind of low noise compositing lithio ester according to claim 1, it is characterised in that: wherein antioxidant is octyl hexichol
Amine, butyl diphenylamines, di-iso-octyldiphenylamine, phenolic ester, alkyl phenyl amine it is one or more.
5. a kind of low noise compositing lithio ester according to claim 1, it is characterised in that: wherein antirust agent is mahogany acid
One of calcium, barium mahogany sulfonate, sorbester p17 are a variety of.
6. a kind of low noise compositing lithio ester according to claim 1, it is characterised in that: wherein boron in boric acid spirit solution
The mass fraction of acid is 0.5% ~ 3%.
7. a kind of prepare a kind of method of low noise compositing lithio ester as described in claim 1, it is characterised in that: including following
Step:
(1) by lithium hydroxide and stearic acid, 12 hydroxy stearic acids, then with and base oil mix, reacted under the conditions of 100 ~ 130 DEG C
1 hour；
(2) 220 ~ 230 DEG C are continuously heating to, 15min is stirred；
(3) reconciliation kettle is gone to be cooled down；
(4) boric acid spirit solution and antioxidant, antirust agent is added；
(5) it is ground 2 times with triple-roller mill；
(6) it is filtered and deaerates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810761683.0A CN109054965B (en) | 2018-07-12 | 2018-07-12 | Low-noise composite lithium-based grease |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810761683.0A CN109054965B (en) | 2018-07-12 | 2018-07-12 | Low-noise composite lithium-based grease |
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| Publication Number | Publication Date |
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| CN109054965A true CN109054965A (en) | 2018-12-21 |
| CN109054965B CN109054965B (en) | 2021-06-15 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1083353A2 (en) * | 1999-09-08 | 2001-03-14 | Minebea Co., Ltd. | Bearing having low torque, small noise and long life |
| CN1616612A (en) * | 2003-11-13 | 2005-05-18 | 中国石油化工股份有限公司 | Composite lithium base lubricant and its preparing method |
| CN101087868A (en) * | 2004-07-30 | 2007-12-12 | 美蓓亚株式会社 | Lithium grease composition sealed in a small motor bearing to reduce noise |
| CN102010777A (en) * | 2010-12-20 | 2011-04-13 | 云南光电辅料有限公司 | Grease lubricant for optical lens |
| CN108085096A (en) * | 2017-12-25 | 2018-05-29 | 新乡市恒星科技有限责任公司 | A kind of high dropping point universal lithium base grease and preparation method thereof |
-
2018
- 2018-07-12 CN CN201810761683.0A patent/CN109054965B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1083353A2 (en) * | 1999-09-08 | 2001-03-14 | Minebea Co., Ltd. | Bearing having low torque, small noise and long life |
| CN1616612A (en) * | 2003-11-13 | 2005-05-18 | 中国石油化工股份有限公司 | Composite lithium base lubricant and its preparing method |
| CN101087868A (en) * | 2004-07-30 | 2007-12-12 | 美蓓亚株式会社 | Lithium grease composition sealed in a small motor bearing to reduce noise |
| CN102010777A (en) * | 2010-12-20 | 2011-04-13 | 云南光电辅料有限公司 | Grease lubricant for optical lens |
| CN108085096A (en) * | 2017-12-25 | 2018-05-29 | 新乡市恒星科技有限责任公司 | A kind of high dropping point universal lithium base grease and preparation method thereof |
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|---|---|
| CN109054965B (en) | 2021-06-15 |
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