CN116948725A - Coal-based diesel engine oil composition and preparation method thereof - Google Patents

Coal-based diesel engine oil composition and preparation method thereof Download PDF

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Publication number
CN116948725A
CN116948725A CN202210396560.8A CN202210396560A CN116948725A CN 116948725 A CN116948725 A CN 116948725A CN 202210396560 A CN202210396560 A CN 202210396560A CN 116948725 A CN116948725 A CN 116948725A
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coal
content
antioxidant
diesel engine
component
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郭鹏
汤仲平
金鹏
张勤
焦军平
徐瑞峰
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Petrochina Co Ltd
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Petrochina Co Ltd
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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
    • 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
    • C10M169/048—Mixtures of base-materials and additives the additives being a mixture of compounds of unknown or incompletely defined constitution, non-macromolecular and macromolecular compounds
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    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
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    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
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    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
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    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/14—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to carbon atoms of six-membered aromatic rings
    • C10M2207/144—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to carbon atoms of six-membered aromatic rings containing hydroxy groups
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    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/26—Overbased carboxylic acid salts
    • C10M2207/262—Overbased carboxylic acid salts derived from hydroxy substituted aromatic acids, e.g. salicylates
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    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/284—Esters of aromatic monocarboxylic acids
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    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
    • C10M2209/084—Acrylate; Methacrylate
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    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
    • C10M2215/064—Di- and triaryl amines
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    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
    • C10M2215/064—Di- and triaryl amines
    • C10M2215/065—Phenyl-Naphthyl amines
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    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/086—Imides
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    • 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
    • C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • 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
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    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/06—Thio-acids; Thiocyanates; Derivatives thereof
    • C10M2219/062—Thio-acids; Thiocyanates; Derivatives thereof having carbon-to-sulfur double bonds
    • C10M2219/066—Thiocarbamic type compounds
    • C10M2219/068—Thiocarbamate metal salts
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    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • 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
    • C10M2223/045—Metal containing thio derivatives
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    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/02—Pour-point; Viscosity index
    • C—CHEMISTRY; METALLURGY
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    • 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
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    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/10—Inhibition of oxidation, e.g. anti-oxidants
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    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/25—Internal-combustion engines
    • C10N2040/252—Diesel engines

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  • Chemical & Material Sciences (AREA)
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  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)

Abstract

The invention discloses a coal-based diesel engine oil composition, which comprises the following components by taking the total weight of the composition as a reference: the content of the coal-based base oil is 72.0 to 86.0 percent; (B) The content of the mixed matrix metal detergent is 2.0-8.0%; (C) antiwear additive in 0.2-1.2 wt%; (D) rubber antioxidant with the content of 0.2-1.2%; (E) ashless dispersant, the content is 3.0-10.0%; (F) an antioxidant and anticorrosive agent with the content of 0.5-2.5%; (G) antioxidant with the content of 0.4-2.4%; (H) viscosity index improver with the content of 1.0-8.0%; the content of the pour point depressant is 0.2 to 0.8 percent. The composition has excellent oxidation resistance.

Description

Coal-based diesel engine oil composition and preparation method thereof
Technical Field
The invention belongs to the technical field of lubricating oil products, and particularly relates to a coal-based diesel engine oil composition and a preparation method of the coal-based diesel engine oil composition.
Background
At present, the base oil at home and abroad is mainly classified according to an API-1509 classification standard proposed by the American Petroleum Institute (API). The standard is based on the saturated alkane content, sulfur content and viscosity index in the base oil as the discrimination basis for classification. Refined mineral base oils are referred to as one type of base oil, hydrofined mineral base oils are referred to as two and three types of base oils, PAOs are referred to as four types of base oils, and base oils other than the above types are collectively referred to as five types of base oils. The change of the molecular structure of the base oil affects the physical and chemical properties such as saturated alkane content, viscosity index, thermal oxidation stability, viscosity retention under high shear and the like of the base oil. Thus, the essential reasons for affecting the properties of the base oil are: the molecular structures of different types of base oils are different. For paraffinic base oils, the differences in the type of raw materials and the process of production will affect the molecular structure of the base oil: for mineral base oil, crude oil is used as a raw material and is prepared through processes such as rectification, hydrogenation and the like, so that the molecular structure of the mineral base oil is influenced by the difference of the properties of different crude oils and the difference of hydrofining processes; the change in molecular structure of the base oil is a key factor affecting the lubricating properties.
The change of the molecular structure of the base oil affects the physical and chemical properties such as saturated alkane content, viscosity index, thermal oxidation stability, viscosity retention under high shear and the like of the base oil. Thus, the essential reason for affecting the properties of base oils is the difference in molecular structure of different types of base oils. For paraffinic base oils, the molecular structure of the base oil will be affected by the different types of raw materials and processes. For mineral base oil, crude oil is used as a raw material and is prepared through processes such as rectification, hydrogenation and the like, so that the molecular structure of the mineral base oil is influenced by the difference of the properties of different crude oils and the difference of hydrofining processes. The change of the molecular structure of the base oil is a key factor affecting the lubricating performance and is important for reducing the friction force of the lubricating oil. It is important to examine the influence of the molecular structure of the base oil on the performance of the oil.
With the continuous development of the technology for indirectly synthesizing oil products from coal, some scientific research institutions in China already grasp key core technologies. The low temperature synthesis technique and the high temperature synthesis technique are classified according to the temperature. The low-temperature composition is mainly Fischer-Tropsch wax of normal alkane, has wide carbon number distribution range (C20-C100), and is an ideal raw material for producing high-viscosity index lubricating oil base oil. The high temperature synthesis products include olefins, fuel oils, and oxygenates. Because the coal reserves in China are richer than natural gas, the raw material of the Fischer-Tropsch synthesis technology in China is mainly coal.
The coal-to-oil is produced by gasifying coal to produce synthetic gas and then Fischer-Tropsch synthesis of oil, and mainly comprises two technological routes of direct coal liquefaction and indirect coal liquefaction. The coal-based synthesized III+ base oil is prepared from an intermediate oil product of Fischer-Tropsch synthesis, and is prepared by adopting an international leading process, wherein the performance of the III+ base oil is close to that of PAO, the viscosity index can reach 140 at the highest, the pour point can be as low as-36 ℃, the oxidation stability and the light stability are good, the requirements of developing six-engine and industrial 4.0 high-end lubricating oil are very met, and the coal-based synthesized III+ base oil has wide market prospect.
With the success of the development of domestic coal-based base oils, the application in the lubricating oil field has been started. Patent CN110951522 reports a coal-based total synthesis long-life gas turbine lubricating oil and a preparation method thereof, and patent CN111019743 reports a coal-based total synthesis low-temperature hydraulic oil and a preparation method thereof.
Disclosure of Invention
A first object of the present invention is to provide a coal-based diesel engine oil composition having excellent oxidation resistance.
The second object of the invention is to provide a method for preparing the coal-based diesel engine oil composition.
The first technical scheme adopted by the invention is that the coal-based diesel engine oil composition comprises the following components by taking the total weight of the composition as a reference: the content of the coal-based base oil is 72.0 to 86.0 percent; (B) The content of the mixed matrix metal detergent is 2.0-8.0%; (C) antiwear additive in 0.2-1.2 wt%; (D) rubber antioxidant with the content of 0.2-1.2%; (E) ashless dispersant, the content is 3.0-10.0%; (F) an antioxidant and anticorrosive agent with the content of 0.5-2.5%; (G) antioxidant with the content of 0.4-2.4%; (H) viscosity index improver with the content of 1.0-8.0%; the content of the pour point depressant is 0.2 to 0.8 percent.
The present invention is also characterized in that,
the component (A) is one or more of CTL4, CTL6 and CTL10, the viscosity index is not less than 140, and the pour point is not higher than-36 ℃.
The component (B) mixed matrix metal detergent is prepared by mixing calcium alkyl salicylate and calcium alkyl benzene sulfonate according to the mass ratio of 3:7 to perform neutralization reaction and high alkalinity reaction. The mixed matrix metal detergent has a base number greater than 270mgKOH/g.
The component (C) antiwear additive is antimony dialkyl dithiocarbamate or selenium dialkyl dithiocarbamate.
The rubber antioxidant of the component (D) is one or more of an antioxidant D, an antioxidant DNP, an antioxidant A, an antioxidant 4010 and an antioxidant 4020.
Component (E) is a mixture of mono-polyisobutylene succinimide dispersants, di-polyisobutylene succinimide ashless dispersants;
wherein the structure of the monoisobutylene succinimide dispersant is as follows:
the structure of the diisobutylene succinimide dispersant is as follows:
PIB in the formula is polyisobutene, the molecular weight is 900-2500, and n is a positive integer which is not zero.
The component (F) of the antioxidant and corrosion inhibitor is zinc dialkyl dithiophosphate;
wherein, the structural formula of the zinc dialkyl dithiophosphate is:
wherein r=c n H 2n+1 ，n＝3～10。
The component (G) antioxidant is a mixture of a phenol antioxidant and an amine antioxidant;
wherein the phenolic antioxidant is 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, and the amine antioxidant is alkyl diphenylamine.
The viscosity index improver of the component (H) is ethylene-propylene copolymer or polymethacrylate.
The pour point depressant of component (I) is a polyalphaolefin or polymethacrylate.
The sulfur content of the coal-based diesel engine oil composition is not more than 0.4%, the phosphorus content is not more than 0.12%, and the sulfated ash content is not more than 1.0%.
Component (A) comprises 72.0 to 86.0% by weight of the total composition, preferably in the range of 78.0 to 86.0%.
Component (B) is present in an amount of 2.0 to 8.0% by weight, preferably in an appropriate range of 2.0 to 5.5% by weight, based on the total weight of the composition.
Component (C) is present in an amount of 0.2 to 1.2% by weight, preferably in an appropriate range of 0.2 to 0.8% by weight, based on the total weight of the composition.
Component (D) is present in an amount of 0.2 to 1.2% by weight, preferably in an appropriate range of 0.2 to 1.0% by weight, based on the total weight of the composition.
Component (E) comprises 3.0 to 10.0% by weight of the total composition, preferably in the range of 3.0 to 8.0%.
Component (F) is present in an amount of 0.5 to 2.5% by weight, preferably in an appropriate range of 0.6 to 2.0% by weight, based on the total weight of the composition.
Component (G) is present in an amount of 0.4 to 2.4% by weight, preferably in an appropriate range of 0.6 to 2.0% by weight, based on the total weight of the composition.
Component (H) comprises 1.0 to 8.0% by weight of the total composition, preferably in the range of from 1.0 to 7.0%.
Wherein component (I) comprises 0.2 to 0.8% by weight of the total composition, preferably in the range of 0.2 to 0.6%.
The second technical scheme adopted by the invention is that the preparation method of the coal-based diesel engine oil composition comprises the following specific steps: the A, B, C, D, E, F, G, H, I component was added to the vessel in one portion and stirred thoroughly for at least 2 hours until the composition was well mixed.
The beneficial effects of the invention are as follows:
the coal-based diesel engine oil composition has excellent low-temperature performance and oxidation resistance; the method is simple and easy to operate.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The invention provides a coal-based diesel engine oil composition, which comprises the following components by taking the total weight of the composition as a reference: the content of the coal-based base oil is 72.0 to 86.0 percent; (B) The content of the mixed matrix metal detergent is 2.0-8.0%; (C) antiwear additive in 0.2-1.2 wt%; (D) rubber antioxidant with the content of 0.2-1.2%; (E) ashless dispersant, the content is 3.0-10.0%; (F) an antioxidant and anticorrosive agent with the content of 0.5-2.5%; (G) antioxidant with the content of 0.4-2.4%; (H) viscosity index improver with the content of 1.0-8.0%; the content of the pour point depressant is 0.2 to 0.8 percent.
The component (A) is one or more of CTL4, CTL6 and CTL10, the viscosity index is not less than 140, and the pour point is not higher than-36 ℃.
The component (B) mixed matrix metal detergent is prepared by mixing calcium alkyl salicylate and calcium alkyl benzene sulfonate together for neutralization reaction and high alkalinity reaction, and the mass ratio of the calcium alkyl salicylate to the calcium alkyl benzene sulfonate is 3:7. The mixed matrix metal detergent has a base number greater than 270mgKOH/g.
The component (C) antiwear additive is antimony dialkyl dithiocarbamate or selenium dialkyl dithiocarbamate.
The rubber antioxidant of the component (D) is one or more of an antioxidant D, an antioxidant DNP, an antioxidant A, an antioxidant 4010 and an antioxidant 4020.
Component (E) is a mixture of mono-polyisobutylene succinimide dispersants, di-polyisobutylene succinimide ashless dispersants;
the component (F) of the antioxidant and corrosion inhibitor is zinc dialkyl dithiophosphate;
the antioxidant component (G) is a mixture of a phenolic antioxidant and an amine antioxidant.
The viscosity index improver of the component (H) is ethylene-propylene copolymer or polymethacrylate.
The pour point depressant of component (I) is a polyalphaolefin or polymethacrylate.
The sulfur content of the composition is not more than 0.4%, the phosphorus content is not more than 0.12%, and the sulfated ash content is not more than 1.0%.
The invention also provides a preparation method of the coal-based diesel engine oil composition, which comprises the following specific steps: the A, B, C, D, E, F, G, H, I component was added to the vessel in one portion and stirred thoroughly for at least 2 hours until the composition was well mixed.
Example 1
The coal-based diesel engine oil composition disclosed by the invention comprises the following raw materials in percentage by mass based on the total weight of the composition:
and fully stirring the components and the contents in the table for 2 hours until the composition is uniformly mixed, thus obtaining the coal-based diesel engine oil composition.
Example 2
The invention relates to a coal-based diesel engine oil composition, which comprises the following raw materials in parts by mass:
and fully stirring the components and the contents in the table for 2.5 hours until the composition is uniformly mixed, thus obtaining the coal-based diesel engine oil composition.
Example 3
The coal-based diesel engine oil composition disclosed by the invention comprises the following raw materials in percentage by mass based on the total weight of the composition:
and fully stirring the components and the contents in the table for 3 hours until the composition is uniformly mixed, thus obtaining the coal-based diesel engine oil composition.
The invention adopts an elemental analysis method to test the sulfur content and the phosphorus content of the oil product, adopts a viscosity analysis method to test the kinematic viscosity and the high-temperature high-shear viscosity of the oil product, and adopts a sulfated ash content measuring method to test the sulfated ash content of the oil product.
The invention adopts a low-temperature dynamic viscosity test pour point test to inspect the low-temperature performance of the oil product, and adopts a PDSC method to evaluate the oxidation resistance of the oil product.
The following are the tests of the indexes of sulfur content, phosphorus content, sulfated ash and the like of the oil products of examples 1-3, and the analysis results are shown in Table 1.
Table 1 shows the physicochemical properties of examples 1 to 3 according to the invention.
From the test results in Table 1, it can be seen that the oil product of the present invention has low sulfur content, low phosphorus content and low sulfated ash, and is suitable for lubrication of diesel engines with emissions of six countries and below.
The following are the test of the detergency and anti-oxidant properties of the oils of examples 1-3, and the analysis results are shown in Table 2.
Table 2 shows physicochemical property tests of examples of the present invention
As can be seen from the test results in Table 2, the oil product of the invention has a longer oxidation induction period, which indicates that the oxidation resistance of the oil product is good.
Example 4
The coal-based diesel engine oil composition disclosed by the invention comprises the following raw materials in percentage by mass based on the total weight of the composition:
and fully stirring the components and the contents in the table for 3.5 hours until the composition is uniformly mixed, thus obtaining the coal-based diesel engine oil composition.
Example 5
The coal-based diesel engine oil composition disclosed by the invention comprises the following raw materials in percentage by mass based on the total weight of the composition:
and fully stirring the components and the contents in the table for 4 hours until the composition is uniformly mixed, thus obtaining the coal-based diesel engine oil composition.

Claims (10)

1. The coal-based diesel engine oil composition is characterized by comprising the following components by taking the total weight of the composition as a reference: the content of the coal-based base oil is 72.0 to 86.0 percent; (B) The content of the mixed matrix metal detergent is 2.0-8.0%; (C) antiwear additive in 0.2-1.2 wt%; (D) rubber antioxidant with the content of 0.2-1.2%; (E) ashless dispersant, the content is 3.0-10.0%; (F) an antioxidant and anticorrosive agent with the content of 0.5-2.5%; (G) antioxidant with the content of 0.4-2.4%; (H) viscosity index improver with the content of 1.0-8.0%; the content of the pour point depressant is 0.2 to 0.8 percent.
2. The coal-based diesel engine oil composition according to claim 1, wherein the component (a) coal-based base oil is one or more of CTL4, CTL6, CTL10, and has a viscosity index of not less than 140 and a pour point of not more than-36 ℃.
3. The coal-based diesel engine oil composition according to claim 1, wherein the component (B) mixed matrix metal detergent is prepared by mixing calcium alkylsalicylate and calcium alkylbenzenesulfonate according to a mass ratio of 3:7.
4. The coal-based diesel engine oil composition of claim 1, wherein the antiwear additive of component (C) is antimony dialkyldithiocarbamate or selenium dialkyldithiocarbamate.
5. The coal-based diesel engine oil composition according to claim 1, wherein the rubber antioxidant of the component (D) is one or more of an antioxidant D, an antioxidant DNP, an antioxidant a, an antioxidant 4010, and an antioxidant 4020.
6. The coal-based diesel engine oil composition of claim 1, wherein the component (E) is a mixture of mono-polyisobutylene succinimide based dispersants, di-polyisobutylene succinimide based ashless dispersants; the component (F) antioxidant and corrosion inhibitor is zinc dialkyl dithiophosphate; the component (G) antioxidant is formed by mixing a phenol antioxidant and an amine antioxidant.
7. The coal-based diesel engine oil composition of claim 1, wherein the component (H) viscosity index improver is an ethylene propylene copolymer or a polymethacrylate.
8. The coal-based diesel engine oil composition of claim 1, wherein the component (I) pour point depressant is a polyalphaolefin or polymethacrylate.
9. The coal-based diesel engine oil composition of claim 1 wherein the composition has a sulfur content of no greater than 0.4%, a phosphorus content of no greater than 0.12%, and a sulfated ash content of no greater than 1.0%.
10. The method for preparing a coal-based diesel engine oil composition according to any one of claims 1 to 9, characterized by the specific steps of: the A, B, C, D, E, F, G, H, I component was added to the vessel in one portion and stirred thoroughly for at least 2 hours until the composition was well mixed.
CN202210396560.8A 2022-04-15 2022-04-15 Coal-based diesel engine oil composition and preparation method thereof Pending CN116948725A (en)

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Application Number Priority Date Filing Date Title
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