CN101597539B - Method for preparing special lubricating grease and thickening agent for cylinder of electric tool - Google Patents
Method for preparing special lubricating grease and thickening agent for cylinder of electric tool Download PDFInfo
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Abstract
The invention relates to a method for preparing special lubricating grease and thickening agent for a cylinder of an electric tool. The lubricating grease and thickening agent mainly comprise the following components: a) base oil; b) at least one thickening agent of compound lithium, compound lithium calcium or carbamido grease, or composite thickening agent of any two of the three substances; c) silicon-containing anti-foaming agent; d) one or more extreme-pressure antiwear agents of borates or vulcanized whale oil substitute; e) one or more anilines antioxygens or dialkyldithiophosphates antioxygens; and f) tripolycyanamide urate; wherein the amount of the base oil in use accounts for 70-95% of the total weight of the lubricating grease, the thickening agent accounts for 5-30% of the total weight of the lubricating grease, the amount of the silicon-containing anti-foaming agent accounts for 5-10% of the total weight of the lubricating grease, the amount of the extreme-pressure antiwear agents accounts for 2-5% of the total weight of the lubricating grease, the amount of the antioxygens accounts for 1-5% of the total weight of the lubricating grease, and the amount of the tripolycyanamide urate accounts for 3-15% of the total weight of the lubricating grease. The lubricating grease, rubber and thermoplastic elastomer which are prepared using the components have good compatibility, excellent extreme-pressure wearability, foaming resistance, lubrication, flame resistance and noise lowering, and the like. The lubricating grease is suitable for the lubrication of the cylinders of various electric hammers and electric picks and in particular suitable for the lubrication and sealing of the cylinders of the electric hammers and electric picks which keeps on operating for a long time at a high speed.
Description
Technical field
What the present invention relates to is a kind of cylinder of electric tool lubricating grease composition specially, exactly, is a kind of cylinder of electric tool lubricating grease composition specially of low-cost and high-performance.
Background technology
Power tool can be divided into by purposes: metal cutting is processed nine kinds of power tool, other power tools with power tool, sand milling power tool, assembling with power tool, building road electric instrument, mine power tool, railway power tool, agriculture and animal husbandry power tool, woods, wood, and the international BOSCH of renowned company is obtaining remarkable achievement aspect this.The painstaking efforts that the power tool production of China has experienced decades; Formed with the outlet be main, sold inside the country be auxilliary; The needs in field such as can satisfy that industry, agricultural, construction and decoration, gardens, DIY are used, the industry that in national economy, foreign export and daily life, comes into one's own gradually.China's power tool YO in recent years accounts for 70% of world's power tool output, and export volume has accounted for more than 88% of YO.The power tool export amount of money accounts for more than 40% of world's power tool export amount of money, and China's power tool export amount has occupied deputy German more than one times above global export volume, be sure to occupy outlet the first in the world.China has become the main manufacture base of world's power tool, is the big producing country and the big export country of world's power tool.
Along with the rise of China's power tool industry, being used for the lubricated railway grease demand of cylinder of electric tool increases gradually.Though it is the cylinder of electric tool volume is less,, strict to aspects such as noise reduction, long lifetime, use temperature, adhesivity, oilness, rubber, Compatibility in Plastics owing to it is under the conditions such as high speed, HI high impact load.Domestic less to the cylinder of electric tool Research on Lubricating Grease, manufacturer is also few, and product performance also have much room for improvement.For adapting to the develop rapidly and the technical progress of power tool industry, the research and development of accelerating cylinder of electric tool fat are significant.
Therefore; The purpose of this invention is to provide a kind of grease composition; Said composition is mainly used in the cylinder of electric tool, and the consistency of itself and rubber and thermoplastic elastomer is good, has excellent extreme pressure anti-wear, anti-bubble property, oilness, non-flame properties and noise reduction etc.
On the basis of the performance characteristics of analyzing and use for reference existing domestic and international cylinder of electric tool grease product,, researched and developed the cylinder of electric tool special grease according to the work characteristics of cylinder of electric tool and to the requirement of railway grease.Adopt novel viscosifying agent multiviscosisty high quality base oil; And the interpolation multiple additives forms through the special warfare refining; Can satisfy the lubricated of all kinds of cylinder of electric tool of under different condition, working; Thereby promoted the technical progress and the composition optimizes of domestic power tool railway grease, to grease product production domesticization with for domestic enterprise cuts operating costs significantly, market outlook are wide.
Summary of the invention
The objective of the invention is to overcome the deficiency that prior art exists; And a kind of have excellent low frictional properties, good adhesivity be provided; Can significantly reduce the power loss that the friction of power tool driver causes, the cylinder of electric tool special grease of the mechanical efficiency of raising driver and the preparation method of viscosifying agent.
The present invention is through in cylinder of electric tool, using a kind of grease composition to realize that said composition includes: a) base oil; B) at least a in complex lithium, complex lithium-calcium or the carbamido thickening agent, or any two kinds composite thickening material; C) siliceous kilfoam; D) extreme pressure anti-wear additives of borate or sulfuration haco oil surrogate wherein one or more; E) one or more in phenyl amines oxidation inhibitor or the dialkyldithiaphosphate antioxidant; F) melamine cyanurate; Wherein the base oil consumption is 70～95% of a railway grease total amount; Viscosifying agent content is 5～30% of railway grease total amount; Siliceous kilfoam consumption is 5～10% of a railway grease total amount; The extreme pressure anti-wear additives consumption is 2～5% of a railway grease total amount, and the total consumption of oxidation inhibitor is 1～5% of a railway grease total amount, and the consumption of melamine cyanurate is 3～15% of a railway grease total amount.
Described base oil is selected the mixture of 100SN～900SN, 150BS, lithium material oil, PAO MO, synthetic oil or its arbitrary proportion, and its consumption is 75～90% of a railway grease total amount.
Described viscosifying agent content is 10～25% of railway grease total amount; The methyl-silicone oil that described siliceous kilfoam is a different viscosity, in the dimethyl-silicon wet goods one or more, consumption is 3～8% of a railway grease total amount.
Described extreme pressure anti-wear additives is selected borate for use, and this borate is the water resisting property potassium borate, and consumption is 3～4% of a railway grease total amount.
Described extreme pressure anti-wear additives is selected sulfuration haco oil surrogate for use, and it is in sulfuration Oleum Gossypii semen, the sulfurized olefin cotton oil one or more, and consumption is 1～3% of a railway grease total amount.
Described oxidation inhibitor is one or more in diphenylamine, the dialkyl dithiophosphate, and total consumption is 1～3% of a railway grease total amount.
Described oxidation inhibitor is selected diphenylamine for use, it comprise alkyl diphenylamine, dinonyldiphenylamine, two dodecyl diphenylamine, octyl group/amyl group pentanoic, octyl group/butyl pentanoic, to di-iso-octyldiphenylamine and dioctyl diphenylamine wherein one or more.
Described oxidation inhibitor is selected dialkyl dithiophosphate for use, and preferred zinc dialkyl dithiophosphate is a kind of or a few profit among two octyl group ZDDP, primary/secondary alkyl ZDDP, fourth octyl group ZDDP, the secondary alkyl ZDDP, and total consumption is 1～5% of a railway grease total amount.
The consumption of described melamine cyanurate is 8～12% of a railway grease total amount.
The preparation method of complex lithium-calcium provided by the invention comprises: with base oil and C
12～C
24Lipid acid or hydroxy fatty acid at least a monoprotic acid mix and heating for dissolving, add Ca (OH)
2With partial L iOHH
2The O saponification slowly is warming up to 100～170 ℃, preferred 120～150 ℃, adds C
2～C
12Binary acid continues to be warming up to 120～150 ℃, adds remaining LiOHH
2O continues reaction, is warming up to 200～220 ℃ of refinings then, adds additive when being cooled to 80～110 ℃ and mixes stirring for some time, can cool off still, and homogeneous grinds, packing.
The preparation method of the areidofat that is provided comprises: with base oil and 4, and 4 '-diphenylmethanediisocyanate or 2, at least a Hybrid Heating dissolving in the 4-toluenediisocyanate; Adding with the good alkylamine of base oil dissolving, slowly is warming up to 130～180 ℃ of insulation for some time in advance then, is cooled to 80～110 ℃ of adding additives and stirs; Can cool off still; Homogeneous grinds, packing.
The preparation method of the complex lithium that is provided comprises: with base oil and C
12～C
24Lipid acid or hydroxy fatty acid at least a monoprotic acid mix and heating for dissolving, add partial L iOHH
2The O saponification slowly is warming up to 100～170 ℃, preferred 120～150 ℃, adds C
2～C
12Binary acid continues to be warming up to 120～150 ℃, adds remaining LiOHH
2O continues reaction, is warming up to 200～220 ℃ of refinings then, adds additive when being cooled to 80～100 ℃ and mixes stirring for some time, can cool off still, and homogeneous grinds, packing.
The cylinder of electric tool railway grease of the inventive method preparation has excellent low frictional properties, can significantly reduce the power loss that the friction of power tool driver causes, and improves the mechanical efficiency of driver; Have good adhesivity, can be securely attached to the metallic surface, protection unlikely wearing and tearing of metal and corrosion; Have excellent oxidation stability and mechanical stability, long service life; Splendid load-bearing ability very is fit to have power tool lubricated of heavy loading and impact load; All have good consistency with various conventional sealing materials, guarantee that system sealing is good; Certain noise reduction is arranged; Non-flame properties is excellent.Be applicable to cylinder lubricated of various electric hammers, electric pick, the lubricated and sealing of the electric hammer that is specially adapted to continue for a long time to run up, the cylinder of electric pick.
Embodiment
Cylinder of electric tool special grease of the present invention, it mainly contains: a) base oil; B) at least a in complex lithium, complex lithium-calcium or the areidofat viscosifying agent, or any two kinds composite thickening material; C) siliceous kilfoam; D) extreme pressure anti-wear additives of borate or sulfuration haco oil surrogate wherein one or more; E) one or more in phenyl amines oxidation inhibitor or the dialkyldithiaphosphate antioxidant; F) melamine cyanurate; Wherein the base oil consumption is 70～95% of a railway grease total amount; Viscosifying agent content is 5～30% of railway grease total amount; Siliceous kilfoam consumption is 5～10% of a railway grease total amount; The extreme pressure anti-wear additives consumption is 2～5% of a railway grease total amount, and the total consumption of oxidation inhibitor is 1～5% of a railway grease total amount, and the consumption of melamine cyanurate is 3～15% of a railway grease total amount.
Described base oil is selected the mixture of 100SN～900SN, 150BS, lithium material oil, PAO MO, synthetic oil or its arbitrary proportion, and its consumption is 75～90% of a railway grease total amount; Described viscosifying agent content is 10～25% of railway grease total amount; The methyl-silicone oil that described siliceous kilfoam is a different viscosity, in the dimethyl-silicon wet goods one or more, consumption is 3～8% of a railway grease total amount; The consumption of described melamine cyanurate is 8～12% of a railway grease total amount.
Described extreme pressure anti-wear additives is selected borate for use, and this borate is the water resisting property potassium borate, and consumption is 3～4% of a railway grease total amount.
Described extreme pressure anti-wear additives is selected sulfuration haco oil surrogate for use, and it is in sulfuration Oleum Gossypii semen, the sulfurized olefin cotton oil one or more, and consumption is 1～3% of a railway grease total amount.
Described oxidation inhibitor is one or more in diphenylamine, the dialkyl dithiophosphate, and total consumption is 1～3% of a railway grease total amount.
Described oxidation inhibitor is selected diphenylamine for use, it comprise alkyl diphenylamine, dinonyldiphenylamine, two dodecyl diphenylamine, octyl group/amyl group pentanoic, octyl group/butyl pentanoic, to di-iso-octyldiphenylamine and dioctyl diphenylamine wherein one or more.
Described oxidation inhibitor is selected dialkyl dithiophosphate for use, and preferred zinc dialkyl dithiophosphate is among two octyl group ZDDP, primary/secondary alkyl ZDDP, fourth octyl group ZDDP, the secondary alkyl ZDDP one or more, and total consumption is 1～5% of a railway grease total amount.
A kind of preparation method of viscosifying agent as stated, described viscosifying agent is a kind of complex lithium-calcium, it is with base oil and C
12～C
24Lipid acid or hydroxy fatty acid at least a monoprotic acid mix and heating for dissolving, add Ca (OH)
2With partial L iOHH
2The O saponification slowly is warming up to 100～170 ℃, preferred 120～150 ℃, adds C
2～C
12Binary acid continues to be warming up to 120～150 ℃, adds remaining LiOHH
2O continues reaction, is warming up to 200～220 ℃ of refinings then, adds additive when being cooled to 80～110 ℃ and mixes stirring for some time, can cool off still, and homogeneous grinds, packing.
A kind of preparation method of viscosifying agent as stated, described viscosifying agent is a kind of areidofat, it is with base oil and 4; 4 '-diphenylmethanediisocyanate or 2, at least a Hybrid Heating dissolving in the 4-toluenediisocyanate adds in advance with the good alkylamine of base oil dissolving then; Slowly be warming up to 130～180 ℃ of insulation for some time, be cooled to 80～110 ℃ of adding additives and stir, can cool off still; Homogeneous grinds, packing.
A kind of preparation method of viscosifying agent as stated, described viscosifying agent is a kind of complex lithium, it is with base oil and C
12～C
24Lipid acid or hydroxy fatty acid at least a monoprotic acid mix and heating for dissolving, add partial L iOHH
2The O saponification slowly is warming up to 100～170 ℃, preferred 120～150 ℃, adds C
2～C
12Binary acid continues to be warming up to 120～150 ℃, adds remaining LiOHH
2O continues reaction, is warming up to 200～220 ℃ of refinings then, adds additive when being cooled to 80～100 ℃ and mixes stirring for some time, can cool off still, and homogeneous grinds, packing.
Said base oil can be selected the mixture of MO, synthetic oil or its arbitrary proportions such as 100SN～900SN, 150BS, lithium material oil, PAO.The base oil consumption is 70～95% of a railway grease total amount, preferred 75～90%.Base oil can add at twice in the areidofat, and portion is used for dissolving alkylamine, and consumption is approximately 60～70% of base oil total amount, and another part is used for dissolving vulcabond, and consumption is approximately 30～40%; Also can be divided into three parts of addings, 25～55% of a about base oil total amount is dissolved alkylamines, and 25～55% of the about base oil total amount of another part is used for dissolving vulcabond, and remaining 15～45% adds as cold oil at last.
Said alkylamine can be a straight-chain fatty amine in the areidofat, also can be Cycloalkyl amine, and the alkyl carbon number is 8～24, and preferred 10～18 alkyl are like stearylamine, decyl amine, amino dodecane, tetradecy lamine, octylame, cetylamine, hexahydroaniline.
To combine instance that the present invention is described further below.Following examples can replace with above-mentioned related raw material and can draw more embodiment, and proportion of raw materials according to the invention is a weight proportion.
Embodiment 1
With 53.0g12-oxystearic acid and 40 ℃ of viscosity of 97g is 430～500mm
2The naphthenic mineral oil of/s, 305g40 ℃ viscosity are 90～100mm
2The paraffin base mineral oil Hybrid Heating of/s is stirred to 90 ℃ of dissolvings, adds 1.3～1.5 times of water-soluble 9.1g one hydronium(ion) oxidation lithiums, slowly is warming up to 130～140 ℃ of reactions, adds the 17.6g sebacic acid then; Continue to be warming up to 130～140 ℃, add 1.3～1.5 times of water-soluble 9.2g one hydronium(ion) oxidation lithium reactions again, be warming up to 210 ℃ of high temperature refinings at last, postcooling to 80～110 ℃ adding 39.1g methyl-silicone oil; 9.8g sulfurized olefin cotton oil, 9.8g zinc dialkyl dithiophosphate, 2.4g pentanoic oxidation inhibitor, 14.6g borate extreme pressure anti-wear additives; 48.8g melamine cyanurate mixes, and cools off still, homogeneous; Grind packing, finished product.
Embodiment 2
With 44.1g12-oxystearic acid and 262.0g40 ℃ of viscosity is 130～170mm
2The synthin synthetic oil Hybrid Heating of/s is stirred to 90 ℃ of dissolvings, adds the mixture with 1.3 times of water-soluble 1.23g calcium hydroxides and 5.2g one hydronium(ion) oxidation lithium, slowly is warming up to 130～140 ℃ of reactions, adds the 14.8g sebacic acid then; Continue to be warming up to 130～140 ℃, add 6.4g one hydronium(ion) oxidation lithium (1.3 times of water dissolution) reaction again, be warming up to 205～215 ℃ of high temperature refinings at last; Postcooling to 90 ℃ adding 26.7g methyl-silicone oil, 6.7g sulfurized olefin cotton oil, 6.7g zinc dialkyl dithiophosphate; 1.7g pentanoic oxidation inhibitor, 10g borate extreme pressure anti-wear additives, 33.3g melamine cyanurate; Mix, cool off still, homogeneous; Grind packing, finished product.
Embodiment 3
With 18.2g4,4 '-diphenylmethanediisocyanate and 63g40 ℃ viscosity is 420～490mm
2The naphthenic mineral oil of/s, 246.0g40 ℃ viscosity are 80～100mm
2The paraffin base mineral oil of/s mixes, and heated and stirred to 70 ℃ dissolving adds the 10.0g stearylamine and the mixture of 10.8g hexahydroaniline be dissolved in advance in the above-mentioned naphthenic mineral oil of 30.7g, the above-mentioned paraffin base mineral oil of 123.2g then, slowly is warming up to 150～160 ℃ and is incubated 10min; Postcooling to 80 ℃ adding 40g methyl-silicone oil, 10.1g sulfurized olefin cotton oil, 10g zinc dialkyl dithiophosphate; 2.6g pentanoic oxidation inhibitor, 15.2g borate extreme pressure anti-wear additives, 50g melamine cyanurate; Mix, cool off still, homogeneous; Grind packing, finished product.
The physicochemical property of table 1 instance
| Test subject | Instance 1 | Instance 2 | Instance 3 | TP |
| The Drawing cone in-degree, 1/10mm | 290 | 315 | 292 | GB/T269 |
| Dropping point, ℃ | 321 | 319 | 285 | GB/T3498 |
| Prolong Drawing cone in-degree (100,000 times), 1/10mm | 318 | 337 | 354 | GB/T269 |
| Stencil oil-dividing (100 ℃, 24h) % | 0.9 | 1.1 | 1.3 | SH/T0324-92 |
| Anti-water pouring (38 ℃, 1h) % | 0.5 | 0.4 | 0.2 | SH/T0109 |
| Corrosion (T 2Copper sheet, 100 ℃, 24h) | Qualified | Qualified | Qualified | GB/T7326 |
| Four-ball test P B Kg | ≥114 | ≥105 | ≥94 | GB/T3142 |
| ?P D Kg | ≥620 | ≥500 | ≥315 | GB/T3142 |
Claims (13)
1. cylinder of electric tool special grease is characterized in that it mainly contains:
A) base oil;
B) at least a in complex lithium, complex lithium-calcium or the areidofat viscosifying agent, or any two kinds composite thickening material;
C) siliceous kilfoam;
D) extreme pressure anti-wear additives of borate or sulfuration haco oil surrogate wherein one or more; Described sulfuration haco oil surrogate is one or more in sulfuration Oleum Gossypii semen, the sulfurized olefin cotton oil;
E) one or more in phenyl amines oxidation inhibitor or the dialkyldithiaphosphate antioxidant;
F) melamine cyanurate;
Wherein, The base oil consumption is 70～95% of a railway grease total amount, and viscosifying agent content is 5～30% of railway grease total amount, and siliceous kilfoam consumption is 5～10% of a railway grease total amount; The extreme pressure anti-wear additives consumption is 2～5% of a railway grease total amount; The total consumption of oxidation inhibitor is 1～5% of a railway grease total amount, and the consumption of melamine cyanurate is 3～15% of a railway grease total amount, and each component concentration sum is 100%.
2. cylinder of electric tool special grease according to claim 1; It is characterized in that; Described base oil is selected the mixture of 100SN～900SN, 150BS, lithium material oil, PAO MO, synthetic oil or its arbitrary proportion, and its consumption is 75～90% of a railway grease total amount; Described viscosifying agent content is 10～25% of railway grease total amount; Described siliceous kilfoam is the methyl-silicone oil of different viscosity, in the dimethyl silicone oil one or more, and consumption is 3～8% of a railway grease total amount; The consumption of described melamine cyanurate is 8～12% of a railway grease total amount.
3. cylinder of electric tool special grease according to claim 1 is characterized in that described extreme pressure anti-wear additives is selected borate for use, and this borate is the water resisting property potassium borate, and consumption is 3～4% of a railway grease total amount.
4. cylinder of electric tool special grease according to claim 1 is characterized in that, described extreme pressure anti-wear additives is selected sulfuration haco oil surrogate for use, and consumption is 1～3% of a railway grease total amount.
5. cylinder of electric tool special grease according to claim 1 is characterized in that, described oxidation inhibitor is one or more in diphenylamine, the dialkyl dithiophosphate, and total consumption is 1～3% of a railway grease total amount.
6. according to claim 1 or 5 described cylinder of electric tool special greases; It is characterized in that; Described oxidation inhibitor is selected diphenylamine for use, it comprise alkyl diphenylamine, dinonyldiphenylamine, two dodecyl diphenylamine, octyl group/amyl group pentanoic, octyl group/butyl pentanoic, to di-iso-octyldiphenylamine and dioctyl diphenylamine wherein one or more.
7. according to claim 1 or 5 described cylinder of electric tool special greases; It is characterized in that; Described oxidation inhibitor is selected dialkyl dithiophosphate for use; Be among two octyl group ZDDP, primary/secondary alkyl ZDDP, fourth octyl group ZDDP, the secondary alkyl ZDDP one or more, total consumption is 1～5% of a railway grease total amount.
8. cylinder of electric tool special grease according to claim 7 is characterized in that described oxidation inhibitor is selected zinc dialkyl dithiophosphate for use.
9. preparation method of cylinder of electric tool special grease according to claim 1 or claim 2, described viscosifying agent is a kind of complex lithium-calcium, it is with base oil and C
12～C
24Lipid acid or hydroxy fatty acid at least a monoprotic acid mix and heating for dissolving, add Ca (OH)
2With partial L iOHH
2The O saponification slowly is warming up to 100～170 ℃, adds C
2～C
12Binary acid continues to be warming up to 120～150 ℃, adds remaining LiOHH
2O continues reaction, is warming up to 200～220 ℃ of refinings then, adds additive when being cooled to 80～110 ℃ and mixes stirring for some time, can cool off still, and homogeneous grinds, packing.
10. preparation method according to claim 9 is characterized in that, said slow intensification is for slowly being warming up to 120～150 ℃.
11. the preparation method of cylinder of electric tool special grease according to claim 1 or claim 2, described viscosifying agent is a kind of areidofat, and it is with base oil and 4; 4 '-diphenylmethanediisocyanate or 2, at least a Hybrid Heating dissolving in the 4-toluenediisocyanate adds in advance with the good alkylamine of base oil dissolving then; Slowly be warming up to 130～180 ℃ of insulation for some time; Be cooled to 80～110 ℃ of adding additives and stir, can cool off still, homogeneous; Grind packing.
12. the preparation method of cylinder of electric tool special grease according to claim 1 or claim 2, described viscosifying agent is a kind of complex lithium, and it is with base oil and C
12～C
24Lipid acid or hydroxy fatty acid at least a monoprotic acid mix and heating for dissolving, add partial L iOHH
2The O saponification slowly is warming up to 100～170 ℃, adds C
2～C
12Binary acid continues to be warming up to 120～150 ℃, adds remaining LiOHH
2O continues reaction, is warming up to 200～220 ℃ of refinings then, adds additive when being cooled to 80～100 ℃ and mixes stirring for some time, can cool off still, and homogeneous grinds, packing.
13. preparation method according to claim 12 is characterized in that, said slow intensification is for slowly being warming up to 120～150 ℃.
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| CN200910099623A CN101597539B (en) | 2009-06-11 | 2009-06-11 | Method for preparing special lubricating grease and thickening agent for cylinder of electric tool |
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| CN102604726B (en) * | 2012-02-21 | 2014-09-10 | 杭州得润宝油脂有限公司 | Lubricating grease composition used for electric tool cylinder, and preparation method thereof |
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| CN105586121B (en) * | 2014-10-23 | 2018-12-11 | 杭州得润宝油脂股份有限公司 | A kind of cylinder of electric tool lubricant composition and preparation method thereof |
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| CN101065592A (en) * | 2004-11-25 | 2007-10-31 | 本田技研工业株式会社 | Constant velocity joint |
| CN101319164A (en) * | 2008-07-18 | 2008-12-10 | 杭州得润宝油脂有限公司 | Composite calcium sulphonic consistent grease and preparation method thereof |
| CN101319165A (en) * | 2008-07-18 | 2008-12-10 | 杭州得润宝油脂有限公司 | Heavy-duty gear lubricant and preparation method thereof |
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|---|---|
| CN101597539A (en) | 2009-12-09 |
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