CN109233967A - A kind of calcium sulfonate grease and preparation method thereof - Google Patents
A kind of calcium sulfonate grease and preparation method thereof Download PDFInfo
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- CN109233967A CN109233967A CN201811330710.5A CN201811330710A CN109233967A CN 109233967 A CN109233967 A CN 109233967A CN 201811330710 A CN201811330710 A CN 201811330710A CN 109233967 A CN109233967 A CN 109233967A
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- calcium
- calcium sulfonate
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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
- C10M169/044—Mixtures of base-materials and additives the additives being a mixture of non-macromolecular and macromolecular compounds
-
- 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
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
- C10M2219/046—Overbasedsulfonic acid salts
-
- 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
- C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
-
- 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
- C10N2050/00—Form in which the lubricant is applied to the material being lubricated
- C10N2050/10—Semi-solids; greasy
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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)
- Lubricants (AREA)
Abstract
The invention discloses a kind of calcium sulfonate greases and preparation method thereof, including calcium sulfonate with high base number, base oil, transforming agent, calcium hydroxide, fatty acid, polyurea thickening agent, dispersing agent, glycerol, promotor, calcium lignosulfonate, dialkyl dithiophosphate and tea polyphenols；First calcium sulfonate with high base number and base oil are mixed when preparation and are added in reaction kettle, the fatty acid of transforming agent, promotor, calcium hydroxide and 1/3-1/2 is added, after insulation reaction, it heats up again, remaining fatty acid, thickening agent, dispersing agent and glycerol is added and mixes reaction, it is cooling after finally heating dehydration that calcium lignosulfonate, the reaction of dialkyl dithiophosphate agent tea polyphenols is added.Lubricating grease of the invention not only has mechanical performance, colloid stability strong, has good extreme pressure anti-wear, rust-preventing characteristic and anticorrosive property, and have excellent low temperature pumpmg quality and high-temperature oxidation stability；Preparation process is simple simultaneously, Environmental Safety.
Description
Technical field
The invention belongs to lubricating grease fields more particularly to a kind of calcium sulfonate grease and preparation method thereof.
Background technique
Lubricating grease is a kind of solid-liquid stable formed in fluid lubricant medium to be dispersed in as thickening agent micelle
Colloidal dispersion system, the lubricant being also referred to as thickened.Lubricating grease is known very early to be known, and turning for all kinds of machinery is widely used in
Dynamic and sliding position.Especially industrial in steel, automobile, military project, space flight and aerospace etc., lubricating grease is even more indispensable important material
Material.
Complex calcium sulfonate grease is a kind of new type high temperature multiple-effect rouge, it has excellent high-temperature behavior, machinery stable
Property, colloid stability, oxidation stability, water-resistance, corrosivity, excellent rust-preventing characteristic and extreme pressure anti-wear, it is any being added without
It can reach the effect of lithium saponify in the case where additive, be one of lubricating grease quality of optimal development prospect, in more dirt, more
It is with a wide range of applications in the various bad working environments environment such as water, high load capacity.
Load grease of calcium sulfonic acid was just studied much and applies in the external eighties in last century, and grinding at home
Study carefully it is later, real industrial applications it is seldom.Although being made at present this is because the performance of load calcium sulfonate grease is more excellent
Low temperature pumpmg quality, the thermal oxidation stability of standby lubricating grease are poor, differ a lot of with theoretical performance, and then it is true to result in it
Positive industrial production and application are less.
Summary of the invention
Goal of the invention: the first object of the present invention be to provide a kind of low temperature pumpmg quality and high-temperature thermal oxidation stability compared with
It is excellent, while other performances also excellent calcium sulfonate grease；
The second object of the present invention is to provide the preparation of greases method.
Technical solution: calcium sulfonate grease of the invention includes the following raw material: basicity value 300- in parts by weight
3-7 parts of 5-9 parts of 68-84 parts of 15-26 parts of calcium sulfonate with high base number, base oil, transforming agent, calcium hydroxide, the fat of 400mgKOH/g
6-10 parts sour, 3-5 parts of thickening agent, 2-6 parts of dispersing agent, 4-9 parts of glycerol, 4-8 parts of promotor, 2-8 parts of calcium lignosulfonate, dioxane
5-8 parts of base dithiophosphates and 3-7 parts of tea polyphenols.
The present invention passes through in the feed by calcium hydroxide, fatty acid, thickening agent, dispersing agent, glycerol, promotor, lignin
Sulfoacid calcium, dialkyl dithiophosphate and tea polyphenols are compounded with calcium sulfonate with high base number, base oil and transforming agent, to make
Standby calcium sulfonate grease not only has mechanical performance, colloid stability strong, have good extreme pressure anti-wear, rust-preventing characteristic and
Anticorrosive property, and there is excellent low temperature pumpmg quality and high-temperature oxidation stability.Wherein, calcium hydroxide and fatty acid are added, is led to
The two combining with transforming agent is crossed, the dosage of calcium sulfonate with high base number is reduced, reduces production cost, industrialization is more suitable for and answers
With, and the low-temperature pumpability of lubricating grease is further improved in conjunction with addition sodium lignin sulfonate on this basis；Together
When, it adds dispersing agent and glycerol, dispersing agent adsorbs thickening agent, be adsorbed on the surface of thickening agent, form load micelle, and
It is steadily scattered in base oil by glycerol, so that thickening agent can be evenly dispersed in base oil and keeps thin grain
Sub- degree, it is interior for a long time not to be gathered into bulky grain mutually and settle；In addition, dialkyl dithiophosphate and tea polyphenols are also added,
The autoxidation that energy one side base oil is added of the two is decomposed, and on the other hand can generate protection isolation film in metal surface,
It prevents metal to the oxidation catalysis of base oil, and then improves the high-temperature oxidation resistant effect of lubricating grease, i.e. raising thermostability.
Furtherly, the base oil that the present invention uses can be paraffine base crude oil, polyethylene glycol synthetic oil, poly- a alkene oil or plant
Object oil.Transforming agent can be made of the acid flux material, alcohols solvent and water of molar ratio 8-15:6-10:1.Wherein, acid flux material can be
Lauric acid, glacial acetic acid, boric acid, butyric acid, caproic acid or octanoic acid.Alcohols solvent can for methanol, ethyl alcohol, normal propyl alcohol, n-butanol or just oneself
Alcohol.Thickening agent can be by the 2 ethyl hexylamine of molar ratio 8-13:6-9:1, isobutyramide and diphenyl methane -4,4'- diisocyanate
Ester composition.Dispersing agent can be sorbitan trioleate, anhydrous sorbitol tristearate or cithrol.Promote
It can be calcium carbonate or dodecyl benzene sulfonic acid into agent.Dialkyl dithiophosphate can be zinc dialkyl dithiophosphate, dioxane
Base phosphordithiic acid copper, Cadmium Dialkyldithiophosphate, dialkyl dithiophosphoric acid lead or antimony dialkyldithiophosphate.
The method that the present invention prepares above-mentioned calcium sulfonate grease, includes the following steps:
(1) calcium sulfonate with high base number and 1/3-1/2 base oil are mixed and is added in reaction kettle, after being warming up to 80-95 DEG C, is added
Transforming agent, promotor, calcium hydroxide and 1/3-1/2 fatty acid, mixture is made in insulation reaction 30-45min；
(2) said mixture is warming up to 100-110 DEG C, remaining base oil, remaining fatty acid, thickening agent, dispersion is added
Agent and glycerol mix, and insulation reaction 1-1.5h is cooled to 100-110 DEG C after then raising temperature to 120-130 DEG C of dehydration 20-30min
Calcium lignosulfonate, dialkyl dithiophosphate and tea polyphenols are added, sulfoacid calcium base lubrication is made in insulation reaction 20-30min
Rouge.
The utility model has the advantages that compared with prior art, remarkable advantage of the invention are as follows: by the feed by calcium hydroxide, rouge
Fat acid, thickening agent, dispersing agent, glycerol, promotor, calcium lignosulfonate, dialkyl dithiophosphate and tea polyphenols with it is high-alkali
Value sulfoacid calcium, base oil and transforming agent are compounded, so that the calcium sulfonate grease of preparation not only has mechanical performance, colloid
Stability is strong, has good extreme pressure anti-wear, rust-preventing characteristic and anticorrosive property, and have excellent low temperature pumpmg quality and high temperature oxygen
Change stability；Simultaneously by the first addition in conversion reaction by calcium hydroxide and partial fatty acid when preparing, and by remainder
Fatty acid compound reaction time be added, further improve the high-temperature behavior and extreme pressure anti-wear of lubricating grease, improve synthesis
Performance.
Specific embodiment
Below with reference to embodiment, further details of the technical solution of the present invention.
The raw material that the present invention uses is purchased from commercially available.Wherein, the basicity value of calcium sulfonate with high base number is 300-400mgKOH/g.
Embodiment 1
The calcium sulfonate grease raw material and its content of the embodiment are as shown in table 1 below.
The raw material and content of 1 embodiment 1 of table
Preparation method includes the following steps:
(1) paraffine base crude oil of calcium sulfonate with high base number and 1/3 is mixed and is added in reaction kettle, after being warming up to 90 DEG C or so, added
Enter lauric acid, methanol, water, calcium carbonate, calcium hydroxide and 1/3 fatty acid, insulation reaction 35min or so, be made mixture；
(2) said mixture is warming up to 105 DEG C or so, remaining paraffine base crude oil, remaining fatty acid, 2- ethyl hexyl is added
Amine, isobutyramide, diphenyl methane -4,4'- diisocyanate, sorbitan trioleate, glycerol mix, insulation reaction 1h
Left and right, after then raising temperature to 125 DEG C or so dehydration 25min or so, is cooled to 105 DEG C or so additions calcium lignosulfonates, dioxane
Calcium sulfonate grease is made in base zinc dithiophosphate and tea polyphenols, insulation reaction 25min or so.
Embodiment 2
The calcium sulfonate grease raw material and its content of the embodiment are as shown in table 2 below.
The raw material and content of 2 embodiment 2 of table
Preparation method includes the following steps:
(1) the polyethylene glycol synthetic oil of calcium sulfonate with high base number and 1/3 is mixed and is added in reaction kettle, be warming up to 85 DEG C or so
Afterwards, be added glacial acetic acid, ethyl alcohol, water, dodecyl benzene sulfonic acid, calcium hydroxide and 1/3 fatty acid, insulation reaction 40min or so,
Mixture is made；
(2) said mixture is warming up to 105 DEG C or so, remaining polyethylene glycol synthetic oil, remaining fatty acid, 2- is added
Ethylhexylamine, isobutyramide, diphenyl methane -4,4'- diisocyanate, anhydrous sorbitol tristearate, glycerol mix, and protect
Temperature reaction 1h or so, after then raising temperature to 125 DEG C or so dehydration 28min or so, is cooled to 105 DEG C or so addition lignin sulfonic acids
Calcium sulfonate grease is made in calcium, dialkyl dithiophosphoric acid copper and tea polyphenols, insulation reaction 25min or so.
Embodiment 3
The calcium sulfonate grease raw material and its content of the embodiment are as shown in table 3 below.
The raw material and content of 3 embodiment 3 of table
Preparation method includes the following steps:
(1) the poly- a alkene oil of calcium sulfonate with high base number and 1/2 is mixed and is added in reaction kettle, after being warming up to 80 DEG C or so, added
Enter boric acid, normal propyl alcohol, water, calcium carbonate, calcium hydroxide and 1/2 fatty acid, insulation reaction 45min or so, be made mixture；
(2) said mixture is warming up to 100 DEG C or so, remaining poly- a alkene oil, remaining fatty acid, 2- ethyl is added
Hexylamine, isobutyramide, diphenyl methane -4,4'- diisocyanate, cithrol, glycerol mix, insulation reaction
1.5h or so, after then raising temperature to 120 DEG C or so dehydration 30min or so, be cooled to 100 DEG C or so addition calcium lignosulfonates,
Calcium sulfonate grease is made in Cadmium Dialkyldithiophosphate and tea polyphenols, insulation reaction 30min or so.
Embodiment 4
The calcium sulfonate grease raw material and its content of the embodiment are as shown in table 4 below.
The raw material and content of 4 embodiment 4 of table
Preparation method includes the following steps:
(1) vegetable oil of calcium sulfonate with high base number and 1/2 is mixed and is added in reaction kettle, after being warming up to 95 DEG C or so, is added
Butyric acid, n-butanol, water, calcium carbonate, calcium hydroxide and 1/2 fatty acid, insulation reaction 30min or so, be made mixture；
(2) said mixture is warming up to 110 DEG C or so, remaining vegetable oil, remaining fatty acid, 2- ethyl hexyl is added
Amine, isobutyramide, diphenyl methane -4,4'- diisocyanate, cithrol, glycerol mix, and insulation reaction 1h is left
The right side after then raising temperature to 130 DEG C or so dehydration 20min or so, is cooled to 100 DEG C or so additions calcium lignosulfonates, dialkyl group
Calcium sulfonate grease is made in phosphordithiic acid lead and tea polyphenols, insulation reaction 20min or so.
Lubricating grease prepared by above-described embodiment 1 to 4 carries out performance detection, and the result of acquisition is as shown in table 5 below.
The performance parameter of the lubricating grease of 5 embodiment 1 to embodiment 4 of table preparation
By table 5 it is found that the extension work cone penetration of calcium sulfonate grease of the invention and work cone penetration difference 15
Within, with good mechanical stability energy；And sintering load and maximum nonseizure load numerical value are high, have good extreme pressure
Abrasion resistance；Stencil oil-dividing and water leaching number of dropouts are below 0.5%, with superior anti-water drenching energy and colloid stability
Energy；In addition to this, time induced oxidation phase is long, and high-temperature oxidation resistance is strong, and the similar viscosity value of low temperature is low, low temperature fluidity
By force, pumping is good.
Comparative example 1
Basic step is same as Example 1, the difference is that fatty acid is not added in raw material, specific raw material and its content
As shown in table 6 below.
The raw material and content of 6 comparative example 1 of table
Preparation method includes the following steps:
(1) paraffine base crude oil of calcium sulfonate with high base number and 1/3 is mixed and is added in reaction kettle, after being warming up to 90 DEG C or so, added
Enter lauric acid, methanol, water, calcium carbonate, calcium hydroxide, insulation reaction 35min or so, mixture is made；
(2) said mixture is warming up to 105 DEG C or so, be added remaining paraffine base crude oil, 2 ethyl hexylamine, isobutyramide,
Diphenyl methane -4,4'- diisocyanate, sorbitan trioleate, glycerol mix, and insulation reaction 1h or so then rises
After temperature to 125 DEG C or so dehydration 25min or so, it is cooled to 105 DEG C or so additions calcium lignosulfonates, dialkyl dithiophosphoric acid
Calcium sulfonate grease is made in zinc and tea polyphenols, insulation reaction 25min or so.
Comparative example 2
Basic step is same as Example 1, the difference is that dispersing agent is not added in raw material, specific raw material and its content
As shown in table 7 below.
The raw material and content of 7 comparative example 2 of table
Preparation method includes the following steps:
(1) paraffine base crude oil of calcium sulfonate with high base number and 1/3 is mixed and is added in reaction kettle, after being warming up to 90 DEG C or so, added
Enter lauric acid, methanol, water, calcium carbonate, calcium hydroxide and 1/3 fatty acid, insulation reaction 35min or so, be made mixture；
(2) said mixture is warming up to 105 DEG C or so, remaining paraffine base crude oil, remaining fatty acid, 2- ethyl hexyl is added
Amine, isobutyramide, diphenyl methane -4,4'- diisocyanate, glycerol mix, and insulation reaction 1h or so then raises temperature to 125
DEG C or so after dehydration 25min or so, be cooled to 105 DEG C or so additions calcium lignosulfonate, zinc dialkyl dithiophosphate and tea
Calcium sulfonate grease is made in polyphenol, insulation reaction 25min or so.
Comparative example 3
Basic step is same as Example 1, the difference is that tea polyphenols are not added in raw material, specific raw material and its content
As shown in table 8 below.
The raw material and content of 8 comparative example 3 of table
Preparation method includes the following steps:
(1) paraffine base crude oil of calcium sulfonate with high base number and 1/3 is mixed and is added in reaction kettle, after being warming up to 90 DEG C or so, added
Enter lauric acid, methanol, water, calcium carbonate, calcium hydroxide and 1/3 fatty acid, insulation reaction 35min or so, be made mixture；
(2) said mixture is warming up to 105 DEG C or so, remaining paraffine base crude oil, remaining fatty acid, 2- ethyl hexyl is added
Amine, isobutyramide, diphenyl methane -4,4'- diisocyanate, sorbitan trioleate, glycerol mix, insulation reaction 1h
Left and right, after then raising temperature to 125 DEG C or so dehydration 25min or so, is cooled to 105 DEG C or so additions calcium lignosulfonates, dioxane
Calcium sulfonate grease is made in base zinc dithiophosphate, insulation reaction 25min or so.
The lubricating grease of above-mentioned comparative example 1-3 preparation is subjected to performance detection, the result of acquisition is as shown in table 9 below.
The performance parameter of lubricating grease prepared by 9 embodiment 1 of table, comparative example 1 to 3
By table 9 it is found that do not added in raw material the mechanical stability energy of lubricating grease prepared by fatty acid or tea polyphenols,
Extreme pressure and antiwear behavior, high-temperature oxidation resistance and low-temperature pumpability are poor, when without adding dispersing agent, the mechanical peace of lubricating grease
Qualitative energy, extreme pressure and antiwear behavior, colloid stability energy, high-temperature oxidation resistance and low-temperature pumpability are poor.It follows that this
Invention uses calcium hydroxide, fatty acid, polyurea thickening agent, dispersing agent, glycerol, promotor, calcium lignosulfonate, dialkyl disulfides
It is compounded for phosphate and tea polyphenols with calcium sulfonate with high base number, base oil and transforming agent, thus the sulfoacid calcium base lubrication of preparation
Rouge not only has mechanical performance, colloid stability strong, has good extreme pressure anti-wear, rust-preventing characteristic and anticorrosive property, and have
Excellent low temperature pumpmg quality and high-temperature oxidation stability.
In addition to the implementation, acid solution can be also caproic acid or octanoic acid to the present invention, and alcohols solvent can also be n-hexyl alcohol.
Claims (10)
1. a kind of calcium sulfonate grease, it is characterised in that in parts by weight include the following raw material: basicity value 300-
3-7 parts of 5-9 parts of 68-84 parts of 15-26 parts of calcium sulfonate with high base number, base oil, transforming agent, calcium hydroxide, the fat of 400mgKOH/g
6-10 parts sour, 3-5 parts of thickening agent, 2-6 parts of dispersing agent, 4-9 parts of glycerol, 4-8 parts of promotor, 2-8 parts of calcium lignosulfonate, dioxane
5-8 parts of base dithiophosphates and 3-7 parts of tea polyphenols.
2. calcium sulfonate grease according to claim 1, it is characterised in that: the base oil is paraffine base crude oil, poly- second
Glycol synthetic oil, poly- a alkene oil or vegetable oil.
3. calcium sulfonate grease according to claim 1, it is characterised in that: the transforming agent is by molar ratio 8-15:6-
Acid flux material, alcohols solvent and the water composition of 10:1.
4. calcium sulfonate grease according to claim 3, it is characterised in that: the acid flux material is lauric acid, ice vinegar
Acid, boric acid, butyric acid, caproic acid or octanoic acid.
5. calcium sulfonate grease according to claim 3, it is characterised in that: the alcohols solvent is methanol, ethyl alcohol, just
Propyl alcohol, n-butanol or n-hexyl alcohol.
6. calcium sulfonate grease according to claim 1, it is characterised in that: the thickening agent is by molar ratio 8-13:6-
2 ethyl hexylamine, isobutyramide and the diphenyl methane -4,4'- diisocyanate composition of 9:1.
7. calcium sulfonate grease according to claim 1, it is characterised in that: the dispersing agent is three oil of anhydrous sorbitol
Acid esters, anhydrous sorbitol tristearate or cithrol.
8. calcium sulfonate grease according to claim 1, it is characterised in that: the promotor is calcium carbonate or dodecane
Base benzene sulfonic acid.
9. calcium sulfonate grease according to claim 1, it is characterised in that: the dialkyl dithiophosphate is two
Alkyl zinc dithiophosphate, dialkyl dithiophosphoric acid copper, Cadmium Dialkyldithiophosphate, dialkyl dithiophosphoric acid lead or two
Alkyl dithiophosphoric acid antimony.
10. a kind of method for preparing calcium sulfonate grease described in claim 1, it is characterised in that include the following steps:
(1) calcium sulfonate with high base number and 1/3-1/2 base oil are mixed and is added in reaction kettle, after being warming up to 80-95 DEG C, conversion is added
Agent, promotor, calcium hydroxide and 1/3-1/2 fatty acid, mixture is made in insulation reaction 30-45min；
(2) said mixture is warming up to 100-110 DEG C, be added remaining base oil, remaining fatty acid, thickening agent, dispersing agent and
Glycerol mixes, and insulation reaction 1-1.5h is cooled to 100-110 DEG C of addition after then raising temperature to 120-130 DEG C of dehydration 20-30min
Calcium sulfonate grease is made in calcium lignosulfonate, dialkyl dithiophosphate and tea polyphenols, insulation reaction 20-30min.
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| CN201811330710.5A CN109233967A (en) | 2018-11-09 | 2018-11-09 | A kind of calcium sulfonate grease and preparation method thereof |
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| CN201811330710.5A CN109233967A (en) | 2018-11-09 | 2018-11-09 | A kind of calcium sulfonate grease and preparation method thereof |
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| CN110591795A (en) * | 2019-08-08 | 2019-12-20 | 江苏龙蟠科技股份有限公司 | Railway wheel-rail lubricating grease and preparation method thereof |
| CN111040847A (en) * | 2019-12-10 | 2020-04-21 | 融润化工科技有限公司 | Special lubricating grease for high-dropping-point extreme pressure drill collar threads |
| JPWO2021039363A1 (en) * | 2019-08-30 | 2021-03-04 | ||
| CN114806688A (en) * | 2022-04-25 | 2022-07-29 | 宝鸡文理学院 | Composite calcium sulfonate-based lubricating grease for industrial robot and preparation method thereof |
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| CN114806688A (en) * | 2022-04-25 | 2022-07-29 | 宝鸡文理学院 | Composite calcium sulfonate-based lubricating grease for industrial robot and preparation method thereof |
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Application publication date: 20190118 |
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