CN111876219B - Lubricating grease composition for automobile door stopper - Google Patents
Lubricating grease composition for automobile door stopper Download PDFInfo
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- CN111876219B CN111876219B CN202010566411.2A CN202010566411A CN111876219B CN 111876219 B CN111876219 B CN 111876219B CN 202010566411 A CN202010566411 A CN 202010566411A CN 111876219 B CN111876219 B CN 111876219B
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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
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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
- C10M177/00—Special methods of preparation of lubricating compositions; Chemical modification by after-treatment of components or of the whole of a lubricating composition, not covered by other classes
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- 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
- C10M2205/0206—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers used as base material
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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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/126—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic
- C10M2207/1265—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic used as thickening agent
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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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/128—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof
- C10M2207/1285—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof used as thickening agents
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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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/28—Esters
- C10M2207/2805—Esters used as base material
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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
- C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
- C10M2213/06—Perfluoro polymers
- C10M2213/062—Polytetrafluoroethylene [PTFE]
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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
- 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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- 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
- C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
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- 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 relates to the technical field of lubricating grease, in particular to a lubricating grease composition for an automobile door stopper. The invention discovers that the problems of abnormal sound, abrasion, breakage and the like existing in the prior lubricating grease composition for the automobile door stop can be effectively improved by optimizing the selection and compatibility of the base oil, the thickening agent and the solid lubricant, and the obtained lubricating grease for the automobile door stop has excellent adhesiveness, plastic compatibility, shearing resistance, wear resistance, noise reduction and long service life by optimizing the formula, and is suitable for metal and plastic in a temperature range of-40-150 ℃ and plastic-plastic contact friction pairs.
Description
Technical Field
The invention relates to the technical field of lubricating grease, in particular to a lubricating grease composition for an automobile door stopper.
Background
The Door check (Door check) functions to limit the degree to which the Door opens. On one hand, the door can be limited in maximum opening degree, so that the door is prevented from being opened too much, and on the other hand, the door can be kept open when needed, and the door cannot be automatically closed when the automobile stops on a ramp or blows ordinary wind. The conventional door check is a separate drawstring check, and some checks are integrated with a door hinge, so that the check usually has a check function when the door is fully opened or half opened.
The automobile door limiter is easy to have the problems of abnormal sound, abrasion, fracture and the like in the operation process. Such problems occur mainly due to lubrication failure, which is mainly caused by the following categories: 1. the compatibility between the lubricating grease and the material (PA66 or POM) of the limiting arm is poor, so that the limiting arm is brittle or shrinks; 2. the lubricating grease has poor shearing resistance and adhesion, and grease loss occurs to cause abnormal sound; 3. the lubricating grease has poor resistance to media such as dust, silt, water and the like, so that impurities form abrasive particles on a friction interface, and the abrasion phenomenon occurs; 4. the lubricating grease has poor wear resistance, so that the limiting arm is worn or cracked.
CN 104327926a relates to a grease composition and a preparation method thereof, wherein the grease composition comprises: 2-10% of thickening agent, 84-95% of base oil and 100-670mm of kinematic viscosity2(s) the condensation point is not higher than-42 ℃, and the additive accounts for 2-10%. The lubricating grease disclosed by the invention is good in low-temperature fluidity, good in lubricating property and good in compatibility with nylon materials. CN 104962374A relates to a lubricating grease composition, wherein the lubricating grease is prepared by adopting polyurea thickening agent to thicken metallocene PAO and alkylbenzene mixed base oil, adding an antioxidant, an antirust agent, an antiwear agent, a metal fire retardant, an adhesive and an antioxidant preservative, and has excellent high and low temperature properties, good rubber compatibility, corrosion resistance, moisture resistance, low noise, dust-resistant adhesion and wear resistance. However, the above-mentioned solutions have a drawback that, in the course of 50000 times of temperature-changing durable stands, 5000 times of durability (simultaneous completion of 10 times of water spraying and dust spraying) at 80 ℃ occurs several times of abnormal noise accompanied with a certain abrasion.
Disclosure of Invention
In order to solve the above problems, the present invention provides a grease composition having excellent properties suitable for use in a vehicle door checker.
Specifically, the invention discovers that the problems of abnormal sound, abrasion, fracture and the like existing in the prior lubricating grease composition for the automobile door limiter in use can be effectively improved by optimizing the selection and compatibility of the base oil, the thickening agent and the solid lubricant, and the optimized scheme of the invention is as follows:
a lubricating grease composition for automobile door stoppers comprises a main component and an additive;
the main components and the mass percentage thereof are as follows:
85-90% of mixed base oil,
10-15% of a mixed thickening agent;
based on the total mass of the main components, the following additives are added in percentage by mass:
5-8% of a solid lubricant;
wherein the mixed base oil is a mixture of a high-viscosity synthetic hydrocarbon and a polymer ester oil having a viscosity of not less than 650mm at 40 ℃2(ii)/s, pour point not greater than-40 ℃, viscosity index not less than 150;
the mixed thickening agent is a mixture of a lithium-containing thickening agent and a potassium-containing thickening agent in a molar ratio of 5-7: 1, the lithium-containing thickening agent and the potassium-containing thickening agent are formed by thickening alkali metal by fatty acid, the fatty acid is one or a mixture of more of C16 straight-chain fatty acid, C18 straight-chain fatty acid, C18 isomeric fatty acid and C20 straight-chain fatty acid, the alkali metal for preparing the lithium-containing thickening agent is lithium hydroxide, and the alkali metal for preparing the potassium-containing thickening agent is potassium hydroxide;
the solid lubricant is polytetrafluoroethylene, the average particle size of the solid lubricant is 3-5 mu m, and the particle shape is spherical or nearly spherical.
Preferably, the high viscosity synthetic hydrocarbon is a metallocene PAO (mPAO).
In general, PAO molecules possess an overhanging backbone from which side chains of varying lengths extend in a disordered manner. The mPAO adopts a metallocene catalyst synthesis process, metallocene is a single-active-center catalyst, and a very uniform chemical product can be obtained by the unique geometric structure of the catalyst, so that the mPAO has a comb-shaped structure and does not have an upright side chain. This shape possesses improved rheological and flow characteristics compared to conventional PAOs, and thus may better provide shear stability, lower pour point and higher viscosity index, particularly with much higher shear stability than conventional PAOs due to fewer side chains.
Preferably, the mixed base oil is a mixture of high-viscosity synthetic hydrocarbon and polymer ester oil, and the mass ratio of the high-viscosity synthetic hydrocarbon to the polymer ester oil is 2-5: 1, the two base oils have better synergistic effect, so that the lubricating grease composition has better lubricating property and load resistance, and is beneficial to reducing abnormal sound probability and reducing abrasion.
The invention further optimizes the selection of the base oil, the thickening agent and the solid lubricant, can further improve various properties of the lubricating grease composition, and obtains the following preferred scheme:
preferably, the high viscosity synthetic hydrocarbon is an interpolymer prepared by polymerizing a C9-C11 olefin; the viscosity of the high-viscosity synthetic hydrocarbon at 40 ℃ is 550-1200 mm2The pour point is-40 to-54 ℃, and the viscosity index is 170 to 200.
Preferably, the polymer ester oil is a copolymer prepared by polymerizing a C8-C12 alpha-olefin and an unsaturated diester, and the copolymer molecule comprises more than 10 ester groups; the polymer ester oil has a viscosity of 600-1500 mm at 40 DEG C2/s。
The polyester is typically colorless, uniform and thick liquid, has high viscosity index and flash point, good volatility and pour point, and has the highest known inherent load capacity and good thermal stability and compatibility due to the molecular structure characteristics.
Preferably, the solid lubricant is polytetrafluoroethylene with an average particle size of 3-4 μm, and the addition amount of the solid lubricant is 6-8%, more preferably 7%, based on the total mass of the main components.
Preferably, the additive also comprises a rust inhibitor, in the system, the rust inhibitor is preferably one or more of metal dialkylnaphthalenesulfonates, wherein alkyl is one or two of C9 and C12, metal salt is one of calcium, barium and sodium, and the addition amount of the rust inhibitor is 0.8-1.2%, more preferably 1%, based on the total mass of the main component.
More preferably, the rust inhibitor is barium dialkylnaphthalene sulfonate, wherein the alkyl group is C9.
Preferably, the additive also comprises an antioxidant, wherein the antioxidant is isooctyl diphenylamine, and the addition amount of the antioxidant is 0.8-1.2%, and more preferably 1%, based on the total mass of the main components.
As a preferable scheme, the lubricating grease composition consists of the following main components and additives;
the main components and the mass percentage thereof are as follows:
85-90% of mixed base oil,
10-15% of a mixed thickening agent;
based on the total mass of the main components, the following additives are added in percentage by mass:
6-8% of a solid lubricant;
0.8-1.2% of an antirust agent;
0.8-1.2% of antioxidant.
The invention has the following beneficial effects:
the invention effectively reduces the problems of abnormal sound, abrasion, fracture and the like of the automobile door limiter by optimizing the formula, and the obtained automobile door limiter lubricating grease has excellent adhesion, plastic compatibility, shearing resistance, abrasion resistance, noise reduction and long service life, and is suitable for metal and plastic, and plastic contact friction pairs in the temperature range of-40-150 ℃.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
For the sake of comparison, the high viscosity synthetic hydrocarbons used in the following examples are all metallocene PAOs made from C10 olefins by polymerization in the same batch, and the polymer ester oils are all copolymers made from C8-C12 alpha-olefins and unsaturated diesters by polymerization in the same batch, and the copolymer molecules include more than 10 ester groups, which in practice can be other options as defined in the summary of the invention.
The composition of the grease composition in the following examples is as follows:
the main components and the mass percentage thereof are as follows:
85 percent of mixed base oil,
15% of mixed thickening agent;
based on the total mass of the main components, the following additives are added in percentage by mass:
7% of solid lubricant;
1% of antirust agent;
1% of antioxidant.
The preparation of the grease compositions in the following examples is as follows:
mixing the mixed thickener with 2/3 mixed base oil, slowly heating to 230 deg.C, cooling to 185 deg.C with the rest 1/6 mixed base oil after all materials form a true solution, keeping the temperature constant for 35min, adding the rest 1/6 mixed base oil to reduce the temperature to 160 deg.C, adding polytetrafluoroethylene and isooctyldiphenylamine, stirring until the temperature is reduced to 90 deg.C, and adding barium dinonylnaphthalenesulfonate as antirust agent. The material is dispersed for three times by a three-roller machine to prepare the material.
The examples do not specify particular techniques or conditions, and are to be construed in accordance with the description of the art in the literature or with the specification of the product. The reagents or instruments used are conventional products available from normal commercial vendors, not indicated by the manufacturer.
Example 1
This example provides a grease composition having a blend of a high viscosity synthetic hydrocarbon and a polymer ester oil in a ratio of 3: 1. Wherein the high-viscosity synthetic hydrocarbon is 586mm with viscosity at 40 deg.C2(ii) a PAO having a pour point of-45 ℃ and a viscosity index of 178, wherein the polymer ester oil is selected from the group consisting of PAO having a viscosity of 920mm at 40 ℃2And s. The mixed base oil has the viscosity of 685mm at 40 DEG C2(ii)/s, pour point-42 ℃ and viscosity index 174. The mixed thickening agent is prepared from the following raw materials in a molar ratio of 6: 1 lithium 12 hydroxystearate soap and isomeric potassium stearate soap. The solid lubricant is 4 μm spherical polytetrafluoroethylene, and the addition amount is 7%. The rust inhibitor is barium dinonyl naphthalene sulfonate, and the addition amount is 1%. The antioxidant is selected from iso-dioctyl diphenylamine, and the addition amount is 1%.
Example 2
This example provides a grease packageThe mixed base oil is high viscosity synthetic hydrocarbon and polymer ester oil in the ratio of 4 to 1. Wherein the high-viscosity synthetic hydrocarbon has a viscosity of 917mm at 40 deg.C2(ii) a PAO of metallocene type having a pour point of-42 ℃ and a viscosity index of 187, wherein the polymer ester oil is selected to have a viscosity of 620mm at 40 ℃2And(s) in the presence of a catalyst. The mixed base oil has the viscosity of 782mm at 40 DEG C2(ii)/s pour point-45 ℃ and viscosity index 182. The mixed thickening agent is prepared from the following raw materials in a molar ratio of 5:1 lithium 12 hydroxystearate soap and isomeric potassium stearate soap. The solid lubricant is 3 μm spherical polytetrafluoroethylene, and the addition amount is 7%. The rust inhibitor is barium dinonyl naphthalene sulfonate, and the addition amount is 1%. The antioxidant is selected from isooctyl diphenylamine, and the addition amount is 1%.
Example 3
This example provides a grease composition having a blend of a high viscosity synthetic hydrocarbon and a polymer ester oil in a ratio of 5: 1. Wherein the high-viscosity synthetic hydrocarbon is selected from synthetic hydrocarbon with a viscosity of 614mm at 40 DEG C2(ii) a metallocene PAO having a pour point of-45 ℃ and a viscosity index of 175, wherein the polymer ester oil is selected from those having a viscosity of 1046mm at 40 ℃2And s. The mixed base oil has viscosity of 719mm at 40 DEG C2(s) pour point-45 ℃ and viscosity index 170. The thickening agent is selected from the following components in a molar ratio of 7:1 lithium 12 hydroxystearate soap and isomeric potassium stearate soap. The solid lubricant is 5 μm spherical polytetrafluoroethylene, and the addition amount is 7%. The rust inhibitor is barium dinonyl naphthalene sulfonate, and the addition amount is 1%. The antioxidant is selected from iso-dioctyl diphenylamine, and the addition amount is 1%.
Example 4
This example provides a grease composition that uses a blend of a high viscosity synthetic hydrocarbon and a polymer ester oil in a ratio of 2: 1. Wherein the high-viscosity synthetic hydrocarbon is selected from synthetic hydrocarbon with a viscosity of 614mm at 40 DEG C2(ii) a metallocene PAO having a pour point of-45 ℃ and a viscosity index of 175, wherein the polymer ester oil is selected from those having a viscosity of 890mm at 40 ℃2And s. The mixed base oil has the viscosity of 689mm at 40 DEG C2(ii) a/s pour point of-45 ℃ and a viscosity index of 177. The thickening agent is selected from the following components in a molar ratio of 5:1 lithium 12 hydroxystearate soap and isomeric potassium stearate soap. The solid lubricant is 4 μm spherical polytetrafluoroethylene, and the addition amount is 7%. The rust inhibitor is barium dinonyl naphthalene sulfonate, and the addition amount is 1%. The antioxidant is selected from iso-diOctyl diphenylamine, added in an amount of 1%.
Example 5
This example provides a grease composition having a blend of a high viscosity synthetic hydrocarbon and a polymer ester oil in a ratio of 4: 1. Wherein the high-viscosity synthetic hydrocarbon is 780mm in viscosity at 40 DEG C2(ii) a PAO of metallocene type having a pour point of-40 ℃ and a viscosity index of 185, wherein the polymer ester oil is selected from those having a viscosity of 890mm at 40 ℃2And s. The mixed base oil has viscosity of 824mm at 40 DEG C2(ii)/s, pour point-40 ℃ and viscosity index 177. The thickening agent is selected from the following components in a molar ratio of 5:1 lithium 12 hydroxystearate soap and isomeric potassium stearate soap. The solid lubricant is 4 μm spherical polytetrafluoroethylene, and the addition amount is 7%. The rust inhibitor is barium dinonyl naphthalene sulfonate, and the addition amount is 1%. The antioxidant is selected from iso-dioctyl diphenylamine, and the addition amount is 1%.
Comparative example 1
The comparative example differs from example 1 in that: replacing the high-viscosity synthetic hydrocarbon with an equal amount of low-viscosity synthetic hydrocarbon, wherein the low-viscosity synthetic hydrocarbon is selected from the synthetic hydrocarbon with the viscosity of 72mm at 40 DEG C2(ii) a PAO of-51 ℃ pour point and 142 viscosity index.
Comparative example 2
The comparative example differs from example 1 in that: no polymer ester oil was included in the formulation.
Comparative example 3
This comparative example differs from example 1 in that: the solid lubricant is 8 μm spherical polytetrafluoroethylene.
Comparative example 4
This comparative example provides a commercially available high viscosity bentonite grease using a high viscosity synthetic hydrocarbon (metallocene PAO, viscosity 586mm at 40 ℃ C.)2/s) a compound tackifier (polyisobutylene, model 6130) thickening bentonite (modified by quaternary ammonium salt) and molybdenum disulfide, graphite and an antioxidant are added as additives to prepare the modified bentonite.
Comparative example 5
The comparative example provides a commercially available damping grease, which is prepared by using silicon dioxide thickened high-viscosity methyl silicone oil (the viscosity at 25 ℃ is 1200-1300cst) and adding polytetrafluoroethylene (the average particle size is 8-10 mu m, and the particle appearance is non-spherical).
Comparative example 6
The composite lithium lubricating grease is prepared by adding an extreme pressure antiwear agent, a tackifier, an antioxidant and an antirust preservative into a mixture of composite lithium soap thickened PAO100 and PAO 40.
Test examples
The performance of the greases in the examples and comparative examples were tested and evaluated by testing the material compatibility (PA66 and POM), abrasion resistance, load resistance, lubricity, friction reduction, and door check durability bench tests.
The specific test method comprises the following steps:
1. in a plastic compatibility test, the lubricating grease is contacted with a POM and PA66 plastic part for a long time (168h) at the temperature of 90 ℃, and the Shore hardness change rate and the volume change rate of the POM and PA66 plastic part are measured for evaluation; the test method is specifically referred to SH/T0429;
2. abrasion resistance and load resistance were evaluated by a four-ball machine test; the test method is specifically referred to SH/T0202 and SH/T0204;
3. lubricity and friction reduction were assessed by SRV high frequency linear vibrometer (plastic vs. metal); test methods are specifically referenced to ASTM D7420;
4. the durable bench test of the car door stopper, assemble the lubricating grease that the implementation case and contrast case relate to the durable bench and carry on 5 ten thousand times of durable tests (finish 10 water spray, dust sprinkling during the period) at 80 duC, test its limiting arm quality rate of change, deformation degree come assess; the test is completed at the door check manufacturer.
The test results are shown in table 1 below:
TABLE 1
From table 1, it can be seen that 1-5 implemented within the range of the formula of the invention can meet the performance requirements of the lubricating grease of the automobile door check device in the aspects of compatibility (PA66 and POM), abrasion resistance, load resistance, lubricity, antifriction property and the like of the lubricating grease material, and the quality change rate and the change degree of the check arm are good through 5 ten thousand times of durable bench tests, so that the lubricating requirements of the automobile door check device can be completely met. In comparative example 1, the viscosity of the mixed base oil does not meet the requirement, so that the plastic compatibility, the wear reduction performance and the durable bench test are affected, and abnormal sound and deformation are easily caused; in comparative example 2, the lubricating property and load resistance were affected due to the absence of the polymer ester oil in the mixed base oil, and the abnormal sound probability and the abrasion were easily caused; in comparative example 3, the particle size and morphology used in the solid lubricant were not the same, so that the wear resistance was affected, and abnormal sound and wear phenomena were likely to occur; in comparative examples 4 to 6, the wear resistance and the load resistance of commercially available lubricating grease do not satisfy the lubrication requirements of the door check, and there is a risk of wear and reduction in life.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, it is intended that all such modifications and alterations be included within the scope of this invention as defined in the appended claims.
Claims (12)
1. A lubricating grease composition for an automobile door check, which is characterized by comprising a main component and an additive;
the main components and the mass percentage thereof are as follows:
85-90% of mixed base oil,
10-15% of a mixed thickening agent;
based on the total mass of the main components, the following additives are added in percentage by mass:
5-8% of a solid lubricant;
wherein the mixed base oil is prepared from the following components in a mass ratio of 2-5: 1 mixture of a high viscosity synthetic hydrocarbon and a polymer ester oil having a viscosity of not less than 650mm at 40 DEG C2Has a pour point of not more than-40 deg.C and a viscosity index of not less than 150; the high viscosity synthetic hydrocarbon is a metallocene PAO; the high-viscosity synthetic hydrocarbon is a copolymer prepared by polymerizing C9-C11 olefin; the high-viscosity synthetic hydrocarbon has a viscosity of 550-1200 mm at 40 DEG C2The pour point is minus 40 ℃ to minus 54 ℃, and the viscosity index is 170-200; the polymer ester oil is a copolymer prepared by polymerizing C8-C12 alpha-olefin and unsaturated diester, and the molecule of the copolymer comprises more than 10 ester groups; the viscosity of the polymer ester oil at 40 ℃ is 600-1500 mm2/s；
The mixed thickening agent is a mixture of a lithium-containing thickening agent and a potassium-containing thickening agent in a molar ratio of 5-7: 1, the lithium-containing thickening agent and the potassium-containing thickening agent are formed by thickening alkali metal by fatty acid, the fatty acid is one or a mixture of more of C16 straight-chain fatty acid, C18 straight-chain fatty acid, C18 isomerized fatty acid and C20 straight-chain fatty acid, the alkali metal for preparing the lithium-containing thickening agent is lithium hydroxide, and the alkali metal for preparing the potassium-containing thickening agent is potassium hydroxide;
the solid lubricant is polytetrafluoroethylene, the average particle size of the solid lubricant is 3-5 mu m, and the particle shape is spherical or nearly spherical.
2. The grease composition of claim 1, wherein the mixed thickener is a mixture of a lithium 12 hydroxystearate soap and an isomeric potassium stearate soap in a molar ratio of 5-7: 1.
3. A grease composition according to claim 1 or 2, wherein the solid lubricant is polytetrafluoroethylene having an average particle diameter of 3 to 4 μm, and the amount of the solid lubricant added is 6 to 8% based on the total mass of the main component.
4. The grease composition according to claim 1 or 2, further comprising a rust inhibitor, wherein the rust inhibitor is one or more metal salts of dialkylnaphthalene sulfonate, wherein the alkyl group is one or two selected from C9 and C12, the metal salt is one selected from calcium, barium and sodium, and the addition amount of the rust inhibitor is 0.8-1.2% based on the total mass of the main component.
5. The grease composition as claimed in claim 3, wherein the additive further comprises a rust inhibitor, the rust inhibitor is one or more of metal salts of dialkylnaphthalene sulfonates, wherein the alkyl group is one or two of C9 and C12, the metal salt is one of calcium, barium and sodium, and the addition amount of the rust inhibitor is 0.8-1.2% based on the total mass of the main component.
6. The lubricating grease composition according to any one of claims 1, 2 and 5, wherein the additive further comprises an antioxidant, the antioxidant is isooctyldiphenylamine, and the addition amount of the antioxidant is 0.8-1.2% based on the total mass of the main component.
7. The lubricating grease composition according to claim 3, wherein the additive further comprises an antioxidant, the antioxidant is isooctyldiphenylamine, and the addition amount of the antioxidant is 0.8-1.2% based on the total mass of the main component.
8. The lubricating grease composition according to claim 4, wherein the additive further comprises an antioxidant, the antioxidant is isooctyldiphenylamine, and the addition amount of the antioxidant is 0.8-1.2% based on the total mass of the main component.
9. A grease composition according to any one of claims 1, 2, 5, 7, 8, characterized by consisting of the following main components and additives;
the main components and the mass percentage thereof are as follows:
85-90% of mixed base oil,
10-15% of a mixed thickening agent;
based on the total mass of the main components, the following additives are added in percentage by mass:
6-8% of a solid lubricant;
0.8-1.2% of an antirust agent;
0.8-1.2% of antioxidant.
10. A grease composition according to claim 3, characterized by consisting of the following main components and additives;
the main components and the mass percentage thereof are as follows:
85-90% of mixed base oil,
10-15% of a mixed thickening agent;
based on the total mass of the main components, the following additives are added in percentage by mass:
6-8% of a solid lubricant;
0.8-1.2% of an antirust agent;
0.8-1.2% of antioxidant.
11. A grease composition according to claim 4, characterized by consisting of the following main components and additives;
the main components and the mass percentage thereof are as follows:
85-90% of mixed base oil,
10-15% of a mixed thickening agent;
based on the total mass of the main components, the following additives are added in percentage by mass:
6-8% of a solid lubricant;
0.8-1.2% of an antirust agent;
0.8-1.2% of antioxidant.
12. A grease composition according to claim 6, characterized by consisting of the following main components and additives;
the main components and the mass percentage thereof are as follows:
85-90% of mixed base oil,
10-15% of a mixed thickening agent;
based on the total mass of the main components, the following additives are added in percentage by mass:
6-8% of a solid lubricant;
0.8-1.2% of an antirust agent;
0.8-1.2% of antioxidant.
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| CN202010566411.2A CN111876219B (en) | 2020-06-19 | 2020-06-19 | Lubricating grease composition for automobile door stopper |
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| CN111876219B true CN111876219B (en) | 2022-07-19 |
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| CN101200522A (en) * | 2007-11-26 | 2008-06-18 | 内蒙古金骄特种新材料有限公司 | Polyester oil and method for preparing the same |
| CN103666370B (en) * | 2013-12-03 | 2015-07-29 | 江苏惠丰润滑材料股份有限公司 | Plasticity-vacuum-sealing clay composition |
| CN104327926A (en) * | 2014-10-25 | 2015-02-04 | 中国石油化工股份有限公司 | Lubricating grease composition for automobile door opening stoppers and preparation method thereof |
| CN104962374A (en) * | 2015-07-20 | 2015-10-07 | 广西大学 | Lubricating grease composition for long-service life and wide-temperature antirust vehicle door checks |
| CN106544077B (en) * | 2016-11-04 | 2017-12-12 | 青岛冠军石油化学有限公司 | A kind of ester composition and its application in lubricating oil |
| US20180282650A1 (en) * | 2017-03-31 | 2018-10-04 | Polyplastics Co., Ltd. | Dust-resistant sliding member and method for producing same, window regulator carrier plate, and method for realizing dust-resistant slidability |
| CN107474923A (en) * | 2017-08-24 | 2017-12-15 | 中国石油化工股份有限公司 | A kind of hybrid vehicle transmission mechanism lubricant composition and preparation method |
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