CN112266816A - Knitting machine oil composition, preparation method and application thereof - Google Patents
Knitting machine oil composition, preparation method and application thereof Download PDFInfo
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- CN112266816A CN112266816A CN202011264557.8A CN202011264557A CN112266816A CN 112266816 A CN112266816 A CN 112266816A CN 202011264557 A CN202011264557 A CN 202011264557A CN 112266816 A CN112266816 A CN 112266816A
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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
-
- 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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/04—Ethers; Acetals; Ortho-esters; Ortho-carbonates
-
- 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
- C10M2207/287—Partial esters
- C10M2207/289—Partial esters containing free hydroxy groups
-
- 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
- C10M2207/40—Fatty vegetable or animal oils
- C10M2207/401—Fatty vegetable or animal oils used as base material
-
- 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
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
- C10M2209/104—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only
-
- 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
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
- C10M2209/109—Polyethers, i.e. containing di- or higher polyoxyalkylene groups esterified
-
- 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
- C10M2211/00—Organic non-macromolecular compounds containing halogen as ingredients in lubricant compositions
- C10M2211/08—Halogenated waxes
-
- 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
- C10M2219/02—Sulfur-containing compounds obtained by sulfurisation with sulfur or sulfur-containing compounds
- C10M2219/022—Sulfur-containing compounds obtained by sulfurisation with sulfur or sulfur-containing compounds of hydrocarbons, e.g. olefines
-
- 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
- C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
- C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
- C10M2223/04—Phosphate esters
-
- 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
- C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
- C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
- C10M2223/04—Phosphate esters
- C10M2223/041—Triaryl phosphates
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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)
- Knitting Machines (AREA)
- Lubricants (AREA)
Abstract
The invention relates to a knitting machine oil composition, a preparation method and application thereof, and mainly solves the problem that the knitting machine oil composition in the prior art cannot simultaneously have excellent wear resistance, cleaning performance and storage stability. The invention provides a novel knitting machine oil composition which comprises the following components in parts by weight: a) 0.1-3 parts of an extreme pressure antiwear agent; b) 1-4 parts of a surfactant; c) 93-99 parts of base oil and the technical scheme of the preparation method thereof, and the problem is better solved. Can be used for industrial application of lubricating high-speed cylinder knitting machine equipment.
Description
Technical Field
The invention relates to a knitting machine oil composition, a preparation method and application thereof.
Background
The data show that the export of the knitting industry in China in recent years breaks through the billions of dollars, becomes the first export industry of the textile and clothing industry in China, and the export trade of knitting clothing accounts for one fourth of the world trade. The development and progress of the seamless knitting technology in the knitting industry play an important role, the production efficiency is improved, and the cost is reduced by nearly 40 percent compared with the traditional knitting and sewing processing industry.
The seamless knitted products are all cylindrical fabrics and are produced by processing through a large disc knitting machine. The machine oil, an important auxiliary medium of a circular knitting machine, is mainly used for lubricating parts such as knitting needles, sinkers, triangular needles, inner and outer grooves and the like of a circular knitting machine.
Along with the gradual improvement of knitting technology, the running speed of a circular knitting machine is faster and faster, the friction between a knitting needle and a needle cylinder, between the knitting needle and a triangular plate and other parts is large, so that the temperature rise is extremely fast, and therefore, the knitting machine oil has excellent wear resistance, lubricating performance and cooling performance so as to prevent broken needles and blocked needles; meanwhile, in the knitting process of the high-speed cylindrical knitting machine, the cloth is difficult to stick oil stains, so that the used knitting machine oil is required to have excellent emulsifying property and easy to clean, and the knitted cloth does not pollute the fabric after being cleaned, so that the cleaning property of the knitting machine oil is also an important index. In addition, the knitting machine oil is sometimes stored for a long time due to a long service cycle, and the knitting machine oil also has certain storage stability, so that the knitting machine oil can be stored for a long time without layering, and the stability of various properties of the oil is ensured.
However, in the prior art, the knitting machine oil is often single-sided to emphasize abrasion resistance or cleaning performance. The stability fluctuation of the knitting machine oil is large, the product can be layered and precipitated sometimes, and the actual use stability is poor. The prior art has the problem that the knitting machine oil composition does not simultaneously have excellent wear resistance, excellent emulsifying property and storage stability.
For example, patent "high-wear-resistance easy-cleaning knitting machine oil composition" CN101235336A discloses a knitting machine oil suitable for lubricating equipment such as a circular knitting machine, a hosiery knitting machine, an underwear machine and the like, wherein the knitting machine oil composition comprises the following base oils in percentage by weight: 70-95%, 1-10% of an active agent, 1-10% of an emulsifier and 1-10% of a cleaning agent. The compound of the active agent, the emulsifier, the cleaning agent and the base oil is used for obtaining good cleaning performance on one side, an extreme pressure antiwear agent is not added in the formula, the diameter of a wear point is 0.43-0.62mm, only certain abrasion resistance is considered, and meanwhile, the storage stability performance of the detergent is not evaluated.
Patent "knitting emulsified oil" CN1995302A discloses a liquid composition used for lubrication, antistatic, antirust and cooling in the processes of spinning and weaving, comprising 85-92% of mineral base oil compounded by multiple viscosity base oils and 8-15% of additives, wherein the additives comprise an emulsifier, an antirust agent, an antifriction agent, an antioxidant, a metal deactivator and distilled water, the abrasion spots of the additives are not evaluated, and meanwhile, the stability of the knitting machine oil is not mentioned.
In addition, patent documents such as CN104263478A "easy-to-clean antirust knitting machine oil composition and its use", and CN104342254A "high-wear-resistance knitting machine oil composition and its use" do not introduce the stability of knitting machine oil, and only consider one or more aspects of the wear resistance, cleaning performance or oxidation resistance of knitting machine oil, and the use stability is not concerned.
Therefore, the invention of the knitting machine oil with storage stability on the basis of ensuring excellent wear resistance and cleaning performance has very important significance.
Disclosure of Invention
One of the technical problems to be solved by the invention is that the knitting machine oil composition in the prior art does not simultaneously have the problems of high abrasion resistance, easy cleaning performance and excellent storage stability, and a novel knitting machine oil composition is provided. The knitting machine oil composition has the characteristics of good abrasion resistance and good cleaning property, can provide good lubricating, cooling and other effects for knitting equipment, and ensures the smooth operation of knitting processing. Meanwhile, the fluctuation of the use stability is small, and the product can be stored for a long time in different environments without layering and precipitation. The second technical problem to be solved by the present invention is to provide a method for preparing a knitting machine oil composition corresponding to the first technical problem. The invention aims to solve the third technical problem and provides the application of the knitting machine oil corresponding to one of the problems.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the knitting machine oil composition comprises the following components in parts by weight:
a) 0.1-3 parts of an extreme pressure antiwear agent;
b) 1-4 parts of a surfactant;
c) 93-99 parts of base oil.
In the above technical solution, preferably, the extreme pressure antiwear agent is selected from at least two of sulfurized olefin, sulfurized fatty acid ester, tricresyl phosphate, phosphate ester, chlorinated paraffin or chlorinated fatty acid.
In the above technical solution, preferably, the surfactant is selected from at least two of fatty acid polyoxyethylene ether, fatty acid sorbitan ester, fatty acid glycol ester, sorbitol monooleate, and alkoxylated fatty alcohol.
In the above technical solution, preferably, the base oil is at least one selected from deep-refined mineral oil, vegetable oil, and synthetic oil.
In the above technical solution, preferably, the extreme pressure antiwear agent is selected from at least two of chlorinated paraffin, sulfurized olefin, or phosphate.
In the above technical solution, preferably, the surfactant is selected from at least two of sorbitan fatty acid ester, sorbitan monooleate, and alkoxylated fatty alcohol.
In the technical scheme, preferably, the deeply refined mineral oil is at least one of II-2 or II-6.
In the above technical solution, preferably, the synthetic oil is at least one selected from PAO 6 and PAO 4; the vegetable oil is at least one selected from soybean oil and rapeseed oil.
To solve the second technical problem, the invention adopts the following technical scheme:
the knitting machine oil composition comprises the following steps:
a) putting the base oil into a blending kettle, stirring, heating to 50-60 ℃, and maintaining;
b) adding the extreme pressure antiwear agent, and uniformly stirring;
c) and finally, adding a surfactant, stirring, stopping heating, gradually cooling to room temperature, and stopping stirring to obtain the composition.
In order to solve the third technical problem, the technical scheme adopted by the invention is as follows:
the knitting machine oil composition is applied to lubrication of high-speed cylindrical knitting machine equipment.
The invention adopts the compounding of the extreme pressure agent containing phosphorus, sulfur and chlorine, and ensures higher extreme pressure lubrication performance in advance under the condition of ensuring less addition amount of the extreme pressure agent in a formula system. In addition, by compounding ester and alcohol surfactants, a better emulsifying effect is obtained, and the cleaning performance of the knitting machine oil is ensured. Meanwhile, by introducing the refined mineral oil with good oxidation resistance, the technical scheme that the oxidation resistance of the oil product is ensured without adding an antioxidant in the formula is not needed, and a good technical effect is achieved.
The present invention will be further illustrated with reference to examples and comparative examples.
Detailed Description
[ examples 1 to 6 ]
Putting the base oil into a blending kettle, stirring, heating to 50-60 ℃, and maintaining at the temperature; adding an extreme pressure antiwear agent, and uniformly stirring; and finally, adding a surfactant, stirring, stopping heating, gradually cooling to room temperature, and stopping stirring to obtain the composition. The types and the amounts of the components in the composition are shown in Table 1.
TABLE 1 compositions and parts by weight of the components of examples 1 to 6
[ COMPARATIVE EXAMPLE 1 ]
Compositions were prepared according to the document CN101235336A [ example 1 ]. The composition is as follows: 70% of 5 cst; 17% of polyisobutylene; 3% RL-3; 1% caprylic acid; 3% oleic acid; 0.5% KOH; 1% of AEO-7; 3% of AEO-3; 1% TWEEN 20; 0.5% of T501.
[ COMPARATIVE EXAMPLE 2 ]
Compositions were prepared according to the document CN104263478A [ example 1 ]. The composition is as follows: 3% of fatty alcohol-polyoxyethylene ether; 2.8% of castor oil polyoxyethylene ether; 1.5% sorbitan fatty acid ester; 0.3% of phenyl thiophosphate; 0.3% Vanlubc BHC phenol; 0.06% water; 92.04% hydrogenated base oil.
[ COMPARATIVE EXAMPLE 3 ]
Compositions were prepared according to the document CN104342254A [ example 2 ]. The composition is as follows: 0.5% isotridecanol phosphate; 2% polyoxyethylene ester of fatty acid; 0.05% of 2- (2 '-hydroxy-5' -methylphenyl) benzotriazol
0.5% Vanlube BHC; 96.5% hydrogenated base oil.
The knitting machine oils prepared in the examples and comparative examples were subjected to critical performance tests such as cleaning performance, abrasion resistance, stability, etc., respectively, according to the relevant standards, the test methods being well known to those skilled in the art. The test results of examples 1 to 6 are shown in Table 2. The test results of comparative examples 1 to 3 are shown in Table 3.
The method for evaluating the cleaning performance of the knitting machine oil (self-construction) is carried out by adopting a weighing method according to patent CN104263478A, namely, an oil sample is dripped on a pure cotton fabric subjected to cleaning and drying treatment, the pure cotton fabric is hung and placed for a certain time at room temperature after being weighed, the pure cotton fabric is washed, dried and weighed according to a specified program, the cleanable rate of oil drops on the fabric is calculated, the test is repeated for 3 times, the average value is calculated, and the cleanable performance of an oil product is evaluated.
The testing method (self-construction) of the storage stability performance of the knitting machine oil is as follows:
1) 100ml of knitting machine oil to be tested is poured into a 100ml high-transparency glass measuring cylinder.
2) And covering and sealing the measuring cylinder, and naturally standing the measuring cylinder in an oven at 50 +/-2 ℃ for 60 days.
3) And (3) regularly observing whether the measuring cylinder generates sediment or not and the time, taking out the measuring cylinder after the sediment is generated, and observing the light transmittance and the layered sediment degree of the knitting machine oil in the measuring cylinder under the environment of no vibration and no shaking.
4) And (3) judging the stability according to whether the precipitate is generated and the precipitation layering degree:
the method comprises the following steps: the oil product is uniform and transparent, has no layering and turbidity phenomenon, and has no change compared with the oil product before storage
Unqualified I level: a small amount of layering occurs, and the volume of layering is less than or equal to 2 percent of the volume of the filling sample
③ unqualified II level: the larger amount of stratification appears, the filling pattern volume is more than 2 percent and the stratified volume is less than or equal to 30 percent
Fourthly, unqualified grade III: has serious obvious demixing, the demixing volume is more than 30 percent of the filling style volume
The long-term storage process of the knitting machine oil is simulated by a thermal storage method, and the knitting machine oil is stored for 60 days under the accelerated condition of 50 +/-2 ℃, which is approximately equivalent to the storage for 1 to 2 years under the natural environment. The intermolecular motion is more violent under the heating condition, so that the collision kinetic energy of a dispersion system is increased, and the collision flocculation and the precipitation are easier to generate, so that the quality of the stability of an oil product formula system is inspected.
When the oil product has better stability, the knitting machine oil has no phenomena of flocculation, layering, precipitation and the like for a longer time, the oil product is transparent and uniform, and the light transmittance of the measuring cylinder is better; when the aluminum powder settling property of the oil product is poor, the knitting machine oil can generate the phenomena of flocculation turbidity, delamination, precipitation and the like under the high-temperature limit condition due to the unstable system.
Table 2 test results of examples 1 to 6
TABLE 3 test results of comparative examples 1 to 3
As can be seen from the comparison of Table 2 and Table 3, compared with the same knitting machine oil, the knitting machine oil composition of the invention better balances the cleaning performance, the wear resistance and the storage stability of the oil product, has excellent wear resistance and simultaneously gives consideration to the storage stability of the oil product. The indexes of abrasion resistance, cleaning performance and the like are equivalent to those of similar oil products, the stability is obviously superior to that of the similar oil products, and better technical effects are achieved.
Claims (10)
1. The knitting machine oil composition comprises the following components in parts by weight:
a) 0.1-3 parts of an extreme pressure antiwear agent;
b) 1-4 parts of a surfactant;
c) 93-99 parts of base oil.
2. The knitting machine oil composition of claim 1, wherein the extreme pressure antiwear agent is at least two selected from the group consisting of sulfurized olefins, sulfurized fatty acid esters, tricresyl phosphate, phosphate esters, chlorinated paraffins, and chlorinated fatty acids.
3. The knitting machine oil composition of claim 1, wherein the surfactant is selected from at least two of fatty acid polyoxyethylene ether, fatty acid sorbitan ester, fatty acid glycol ester, sorbitol monooleate, or alkoxylated fatty alcohol.
4. The knitting machine oil composition of claim 1, wherein the base oil is at least one selected from the group consisting of highly refined mineral oils, vegetable oils, and synthetic oils.
5. The knitting machine oil composition of claim 2, wherein the extreme pressure antiwear agent is selected from at least two of chlorinated paraffin, sulfurized olefin, or phosphate ester.
6. The knitting machine oil composition of claim 3, wherein the surfactant is selected from at least two of sorbitan fatty acid esters, sorbitan monooleate, and alkoxylated fatty alcohols.
7. The knitting machine oil composition of claim 4, wherein the highly refined mineral oil is at least one of II-2 or II-6.
8. The knitting machine oil composition of claim 4, wherein the synthetic oil is selected from at least one of PAO 6 or PAO 4; the vegetable oil is at least one selected from soybean oil and rapeseed oil.
9. A method for preparing the knitting machine oil composition of claim 1, comprising the steps of:
a) putting the base oil into a blending kettle, stirring, heating to 50-60 ℃, and maintaining;
b) adding the extreme pressure antiwear agent, and uniformly stirring;
c) and finally, adding a surfactant, stirring, stopping heating, gradually cooling to room temperature, and stopping stirring to obtain the composition.
10. Use of the knitting machine oil composition of claim 1 for lubrication of high speed cylindrical knitting machine equipment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011264557.8A CN112266816A (en) | 2020-11-12 | 2020-11-12 | Knitting machine oil composition, preparation method and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011264557.8A CN112266816A (en) | 2020-11-12 | 2020-11-12 | Knitting machine oil composition, preparation method and application thereof |
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| CN112266816A true CN112266816A (en) | 2021-01-26 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111471509A (en) * | 2020-03-18 | 2020-07-31 | 江苏悦孚油品有限公司 | Knitting auxiliary agent with good extreme pressure wear resistance and preparation process thereof |
| CN111635806A (en) * | 2020-05-27 | 2020-09-08 | 中国石油化工股份有限公司 | Naturally degradable knitting machine oil composition, preparation method and application thereof |
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2020
- 2020-11-12 CN CN202011264557.8A patent/CN112266816A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111471509A (en) * | 2020-03-18 | 2020-07-31 | 江苏悦孚油品有限公司 | Knitting auxiliary agent with good extreme pressure wear resistance and preparation process thereof |
| CN111635806A (en) * | 2020-05-27 | 2020-09-08 | 中国石油化工股份有限公司 | Naturally degradable knitting machine oil composition, preparation method and application thereof |
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Application publication date: 20210126 |