A lubricating oil for an automobile engine

Abstract

The application belongs to the technical field of vehicle lubrication, and particularly relates to a lubricating oil for automobile engine. The lubricating oil for automobile engine has good low-temperature wear resistance and is suitable for low-temperature extremely cold environment. The application adopts metallocene poly-alpha olefin, binary ethylene-propylene rubber, zinc hexadecyl dithiocarbamate, zinc naphthenate, disodium ethylenediaminetetraacetate, polymethyl methacrylate and aluminum silicate as additives to modify base oil. The metallocene poly-alpha olefin, disodium ethylenediaminetetraacetate and aluminum silicate are combined, and zinc hexadecyl dithiocarbamate, zinc naphthenate and polymethyl methacrylate zinc and other components are combined, so that the obtained lubricating oil for automobile engine has good low-temperature wear resistance and is suitable for low-temperature extremely cold environment, and is particularly suitable for northern winter weather, northeast extremely cold area and plateau area.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of vehicle lubrication, and particularly relates to a lubricating oil for an automobile engine. BACKGROUND

[0002] With the popularity and use of automobiles, automobiles have been widely used in production and life. As one of the three major components of automobiles, the running state of the engine has an important influence on the overall performance of the automobile. The use environment of automobiles in China is complex, such as severe cold weather in winter in the north and humid weather in the south, which puts different requirements on the operation of the automobile engine.

[0003] In the north, especially in the northeast, car owners often need to "warm up the car" in the morning in extremely cold weather, so that the lubricating oil in the automobile engine fully lubricates the internal parts of the engine to avoid damage caused by dry friction.

[0004] At present, the commonly used lubricating oil for automobile engines on the market generally uniformly coats the mechanical moving parts of the engine in 1-3 minutes during the above-mentioned "warm-up" process.

[0005] However, the above-mentioned lubricating oil generally has a low tolerance to low temperature conditions, and the anti-wear performance under low temperature conditions is significantly reduced, which cannot provide good lubrication protection to the engine under normal temperature conditions. SUMMARY

[0006] The purpose of the present application is to provide a lubricating oil for an automobile engine, which has good low-temperature wear resistance and is suitable for low-temperature extremely cold environments.

[0007] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0008] The present application provides a lubricating oil for an automobile engine, which comprises the following components by mass:

[0009] 200-500 parts of base oil, 1-10 parts of metallocene polyalphaolefin, 2-7 parts of ethylene-propylene rubber, 10-30 parts of zinc hexadecyl dithiocarbamate, 1-5 parts of zinc naphthenate, 10-25 parts of disodium ethylenediaminetetraacetate, 3-8 parts of polymethyl methacrylate, and 8-30 parts of aluminum silicate.

[0010] Preferably, the number average molecular weight of the ethylene-propylene rubber is 30-120 thousand; and the number average molecular weight of the polymethyl methacrylate is 40-150 thousand.

[0011] Preferably, the lubricating oil for an automobile engine comprises the following components by mass:

[0012] Base oil 200-400 parts, metallocene polyalphaolefin 2-10 parts, ethylene-propylene rubber 2-6 parts, zinc hexadecyl dithiocarbamate 10-25 parts, zinc naphthenate 2-5 parts, disodium ethylenediaminetetraacetate 10-20 parts, polymethyl methacrylate 3-6 parts and aluminum silicate 8-22 parts.

[0013] Preferably, the lubricating oil for automobile engine comprises the following components by mass:

[0014] Base oil 250-350 parts, metallocene polyalphaolefin 4-7 parts, ethylene-propylene rubber 3-5 parts, zinc hexadecyl dithiocarbamate 12-20 parts, zinc naphthenate 3-5 parts, disodium ethylenediaminetetraacetate 11-18 parts, polymethyl methacrylate 4-5 parts and aluminum silicate 10-16 parts.

[0015] Preferably, the lubricating oil for automobile engine comprises the following components by mass:

[0016] Base oil 300 parts, metallocene polyalphaolefin 5 parts, ethylene-propylene rubber 4 parts, zinc hexadecyl dithiocarbamate 15 parts, zinc naphthenate 4 parts, disodium ethylenediaminetetraacetate 12 parts, polymethyl methacrylate 4.5 parts and aluminum silicate 12 parts.

[0017] The application also provides a preparation method of the lubricating oil for automobile engine described in the above scheme, comprising the following steps:

[0018] (1) first heating and mixing base oil, zinc naphthenate, ethylene-propylene rubber, polymethyl methacrylate and zinc hexadecyl dithiocarbamate to obtain premixed oil;

[0019] (2) second heating and mixing the premixed oil with metallocene polyalphaolefin, disodium ethylenediaminetetraacetate and aluminum silicate to obtain the lubricating oil for automobile engine.

[0020] Preferably, the temperature of the first heating and mixing is 30-65℃, and the holding time is 15-50min.

[0021] Preferably, the first heating and mixing is first stirring, and the rotating speed of the first stirring is 100-700rpm.

[0022] Preferably, the temperature of the second heating and mixing is 35-70℃, and the holding time is 10-50min.

[0023] Preferably, the second heating and mixing is second stirring, and the rotating speed of the second stirring is 200-1000rpm.

[0024] The application provides a lubricating oil for automobile engine.

[0025] The application further provides a preparation method of the lubricating oil for automobile engine. DETAILED DESCRIPTION

[0026] The application provides a lubricating oil for automobile engine, which comprises the following components in parts by mass:

[0027] The lubricating oil for automobile engine provided by the application comprises base oil 200-500 parts, preferably 200-400 parts, more preferably 250-350 parts, and further preferably 300 parts, by mass.

[0028] The lubricating oil for automobile engine provided by the application comprises base oil 200-500 parts, preferably 200-400 parts, more preferably 250-350 parts, and further preferably 300 parts, by mass.

[0029] The lubricating oil for automobile engine provided by the application comprises base oil 200-500 parts, preferably 200-400 parts, more preferably 250-350 parts, and further preferably 300 parts, by mass.

[0030] The lubricating oil for automobile engine provided by the application comprises base oil 200-500 parts, preferably 200-400 parts, more preferably 250-350 parts, and further preferably 300 parts, by mass.

[0031] The lubricating oil for automobile engine provided by the application comprises base oil 200-500 parts, preferably 200-400 parts, more preferably 250-350 parts, and further preferably 300 parts, by mass.

[0032] The lubricating oil for automobile engine provided by the application comprises 1-5 parts of zinc naphthenate, preferably 2-5 parts, more preferably 3-5 parts, and further preferably 4 parts.

[0033] The lubricating oil for automobile engine provided by the application comprises 10-25 parts of disodium ethylenediaminetetraacetate, preferably 10-20 parts, more preferably 11-18 parts, and further preferably 12 parts.

[0034] The lubricating oil for automobile engine provided by the application comprises 3-8 parts of polymethyl methacrylate, preferably 3-6 parts, more preferably 4-5 parts, and further preferably 4.5 parts; the number average molecular weight of the polymethyl methacrylate is preferably 40-150 thousand, more preferably 60-120 thousand, and further preferably 80-100 thousand.

[0035] The lubricating oil for automobile engine provided by the application comprises 8-30 parts of aluminum silicate, preferably 8-22 parts, more preferably 10-16 parts, and further preferably 12 parts.

[0036] The application further provides a preparation method of the lubricating oil for automobile engine, comprising the following steps:

[0037] (1) first heating and mixing the base oil, zinc naphthenate, ethylene-propylene rubber, polymethyl methacrylate and zinc hexadecyl dithiocarbamate to obtain a premix oil;

[0038] (2) second heating and mixing the premix oil with metallocene polyalphaolefin, disodium ethylenediaminetetraacetate and aluminum silicate to obtain the lubricating oil for automobile engine.

[0039] The application first heats and mixes the base oil, zinc naphthenate, ethylene-propylene rubber, polymethyl methacrylate and zinc hexadecyl dithiocarbamate to obtain a premix oil.

[0040] In the application, the temperature of the first heating and mixing is preferably 30-65℃, more preferably 35-60℃, and further preferably 40-55℃, and the holding time is preferably 15-50 min, more preferably 25-40 min, and further preferably 30-35 min.

[0041] In the application, the first heating and mixing is preferably first stirring, and the rotating speed of the first stirring is preferably 100-700 rpm, more preferably 200-600 rpm, and further preferably 300-500 rpm.

[0042] In the application, the first heating and mixing preferably further comprises first cooling, standing and second cooling.

[0043] In the present application, the cooling rate of the first cooling is preferably 1-3℃ / min, more preferably 2℃ / min.

[0044] In the present application, the temperature of the standing is preferably 27-28℃, more preferably 27℃, and the holding time is preferably 5-10min, more preferably 6-8min.

[0045] In the present application, the second cooling is preferably natural cooling, and the final temperature of the natural cooling is preferably 25℃.

[0046] After obtaining the premixing oil, the premixing oil is secondarily heated and mixed with the metallocene polyalphaolefin, the disodium ethylenediaminetetraacetate and the aluminum silicate to obtain the lubricating oil for automobile engine.

[0047] In the present application, the temperature of the second heating and mixing is preferably 35-70℃, more preferably 40-60℃, and further preferably 40-50℃, and the holding time is preferably 10-50min, more preferably 20-40min, and further preferably 30min.

[0048] In the present application, the second heating and mixing is preferably second stirring, and the rotating speed of the second stirring is preferably 200-1000rpm, more preferably 300-800rpm, and further preferably 500-600rpm.

[0049] In the present application, the second heating and mixing preferably further comprises third cooling, and the third cooling is preferably natural cooling, and the final temperature of the natural cooling is preferably room temperature.

[0050] In order to further illustrate the present application, the schemes of the present application are described in detail below in conjunction with examples, but they should not be understood as limiting the scope of protection of the present application.

[0051] Example 1

[0052] The present example provides a lubricating oil for automobile engine, which comprises the following components by mass fraction:

[0053] 500 parts of base oil, 10 parts of metallocene polyalphaolefin, 7 parts of ethylene-propylene-diene rubber, 30 parts of zinc hexadecyl dithiocarbamate, 5 parts of zinc naphthenate, 25 parts of disodium ethylenediaminetetraacetate, 8 parts of polymethyl methacrylate and 30 parts of aluminum silicate;

[0054] The number average molecular weight of the ethylene-propylene-diene rubber is 120,000, and the number average molecular weight of the polymethyl methacrylate is 150,000.

[0055] The preparation method of the lubricating oil for automobile engine of the present example comprises the following steps:

[0056] (1) the base oil, zinc naphthenate, ethylene-propylene rubber, polymethyl methacrylate and zinc hexadecyl dithiocarbamate are heated and stirred at 65℃ for 15 min, the stirring speed is 700 rpm, it is cooled at 1℃ / min, it is placed for 10 min at 27℃, it is naturally cooled to 25℃, and a premix oil is obtained;

[0057] (2) the premix oil is heated and stirred with metallocene polyalphaolefin, disodium ethylenediaminetetraacetate and aluminum silicate at 70℃ for 10 min, the stirring speed is 1000 rpm, and it is naturally cooled to room temperature to obtain a lubricating oil for automobile engine.

[0058] Example 2

[0059] The example provides a lubricating oil for automobile engine, which comprises the following components by mass fraction:

[0060] The base oil is 200 parts, the metallocene polyalphaolefin is 1 part, the ethylene-propylene rubber is 2 parts, the zinc hexadecyl dithiocarbamate is 10 parts, the zinc naphthenate is 1 part, the disodium ethylenediaminetetraacetate is 10 parts, the polymethyl methacrylate is 3 parts and the aluminum silicate is 8 parts;

[0061] The number average molecular weight of the ethylene-propylene rubber is 120,000; and the number average molecular weight of the polymethyl methacrylate is 40,000;

[0062] The example provides a lubricating oil for automobile engine, which comprises the following components by mass fraction:

[0063] (1) the base oil, zinc naphthenate, ethylene-propylene rubber, polymethyl methacrylate and zinc hexadecyl dithiocarbamate are heated and stirred at 65℃ for 15 min, the stirring speed is 700 rpm, it is cooled at 1℃ / min, it is placed for 10 min at 27℃, it is naturally cooled to 25℃, and a premix oil is obtained;

[0064] (2) the premix oil is heated and stirred with metallocene polyalphaolefin, disodium ethylenediaminetetraacetate and aluminum silicate at 70℃ for 10 min, the stirring speed is 1000 rpm, and it is naturally cooled to room temperature to obtain a lubricating oil for automobile engine.

[0065] Example 3

[0066] The example provides a lubricating oil for automobile engine, which comprises the following components by mass fraction:

[0067] The base oil is 300 parts, the metallocene polyalphaolefin is 8 parts, the ethylene-propylene rubber is 6 parts, the zinc hexadecyl dithiocarbamate is 20 parts, the zinc naphthenate is 4 parts, the disodium ethylenediaminetetraacetate is 20 parts, the polymethyl methacrylate is 6 parts and the aluminum silicate is 20 parts;

[0068] The number average molecular weight of the ethylene-propylene rubber is 100,000; and the number average molecular weight of the polymethyl methacrylate is 120,000;

[0069] The preparation method of the automobile engine lubricating oil of the embodiment comprises the following steps:

[0070] (1) The base oil, zinc naphthenate, ethylene-propylene rubber, polymethyl methacrylate and zinc hexadecyl dithiocarbamate are heated and stirred at 60℃ for 40min, the stirring speed is 600rpm, it is cooled at 2℃ / min, it is placed at 28℃ for 10min, and it is naturally cooled to 25℃, to obtain a premix oil;

[0071] (2) The premix oil is heated and stirred with metallocene polyalphaolefin, disodium ethylenediaminetetraacetate and aluminum silicate at 40℃ for 40min, the stirring speed is 600rpm, and it is naturally cooled to room temperature, to obtain the automobile engine lubricating oil.

[0072] Example 4

[0073] The automobile engine lubricating oil of the embodiment comprises the following components by mass:

[0074] 400 parts of base oil, 6 parts of metallocene polyalphaolefin, 5 parts of ethylene-propylene rubber, 18 parts of zinc hexadecyl dithiocarbamate, 3 parts of zinc naphthenate, 16 parts of disodium ethylenediaminetetraacetate, 4 parts of polymethyl methacrylate and 22 parts of aluminum silicate;

[0075] The number average molecular weight of the ethylene-propylene rubber is 80,000; and the number average molecular weight of the polymethyl methacrylate is 100,000;

[0076] The preparation method of the automobile engine lubricating oil of the embodiment comprises the following steps:

[0077] (1) The base oil, zinc naphthenate, ethylene-propylene rubber, polymethyl methacrylate and zinc hexadecyl dithiocarbamate are heated and stirred at 45℃ for 30min, the stirring speed is 500rpm, it is cooled at 2℃ / min, it is placed at 28℃ for 8min, and it is naturally cooled to 25℃, to obtain a premix oil;

[0078] (2) The premix oil is heated and stirred with metallocene polyalphaolefin, disodium ethylenediaminetetraacetate and aluminum silicate at 40℃ for 40min, the stirring speed is 800rpm, and it is naturally cooled to room temperature, to obtain the automobile engine lubricating oil.

[0079] Example 5

[0080] The automobile engine lubricating oil of the embodiment comprises the following components by mass:

[0081] Base oil 450 parts, metallocene polyalphaolefin 9 parts, ethylene-propylene rubber 3 parts, zinc hexadecyl dithiocarbamate 12 parts, zinc naphthenate 4 parts, disodium ethylenediaminetetraacetate 19 parts, polymethyl methacrylate 6 parts and aluminum silicate 10 parts;

[0082] The number average molecular weight of the ethylene-propylene rubber is 50,000; and the number average molecular weight of the polymethyl methacrylate is 70,000;

[0083] The preparation method of the lubricating oil for automobile engine of the present embodiment comprises the following steps:

[0084] (1) The base oil, zinc naphthenate, ethylene-propylene rubber, polymethyl methacrylate and zinc hexadecyl dithiocarbamate are heated and stirred at 55℃ for 20min, the stirring speed is 400rpm, it is cooled at 3℃ / min, it is placed at 27℃ for 5min, and it is naturally cooled to 25℃, to obtain a premixed oil;

[0085] (2) The premixed oil is heated and stirred with metallocene polyalphaolefin, disodium ethylenediaminetetraacetate and aluminum silicate at 50℃ for 20min, the stirring speed is 300rpm, and it is naturally cooled to room temperature, to obtain the lubricating oil for automobile engine.

[0086] Example 6

[0087] The present embodiment provides a kind of lubricating oil for automobile engine, comprising the following components by mass parts:

[0088] Base oil 250 parts, metallocene polyalphaolefin 4 parts, ethylene-propylene rubber 4 parts, zinc hexadecyl dithiocarbamate 17 parts, zinc naphthenate 4 parts, disodium ethylenediaminetetraacetate 18 parts, polymethyl methacrylate 4 parts and aluminum silicate 21 parts;

[0089] The number average molecular weight of the ethylene-propylene rubber is 60,000; and the number average molecular weight of the polymethyl methacrylate is 60,000;

[0090] The preparation method of the lubricating oil for automobile engine of the present embodiment comprises the following steps:

[0091] (1) The base oil, zinc naphthenate, ethylene-propylene rubber, polymethyl methacrylate and zinc hexadecyl dithiocarbamate are heated and stirred at 35℃ for 35min, the stirring speed is 500rpm, it is cooled at 3℃ / min, it is placed at 27℃ for 5min, and it is naturally cooled to 25℃, to obtain a premixed oil;

[0092] (2) The premixed oil is heated and stirred with metallocene polyalphaolefin, disodium ethylenediaminetetraacetate and aluminum silicate at 40℃ for 50min, the stirring speed is 300rpm, and it is naturally cooled to room temperature, to obtain the lubricating oil for automobile engine.

[0093] Example 7

[0094] The embodiment provides a lubricating oil for automobile engine, which comprises the following components in parts by mass:

[0095] 200 parts of base oil, 8 parts of metallocene polyalphaolefin, 7 parts of ethylene-propylene-diene rubber, 30 parts of zinc hexadecyl dithiocarbamate, 5 parts of zinc naphthenate, 25 parts of disodium ethylenediaminetetraacetate, 8 parts of polymethyl methacrylate and 30 parts of aluminum silicate;

[0096] The number average molecular weight of the ethylene-propylene-diene rubber is 70,000; and the number average molecular weight of the polymethyl methacrylate is 120,000;

[0097] The embodiment provides a preparation method of the lubricating oil for automobile engine, which comprises the following steps:

[0098] (1) heating and stirring base oil, zinc naphthenate, ethylene-propylene-diene rubber, polymethyl methacrylate and zinc hexadecyl dithiocarbamate at 44 DEG C for 35 min, the stirring speed is 600 rpm, cooling at 2 DEG C / min, standing at 27 DEG C for 6 min, and naturally cooling to 25 DEG C to obtain premix oil;

[0099] (2) heating and stirring the premix oil, metallocene polyalphaolefin, disodium ethylenediaminetetraacetate and aluminum silicate at 45 DEG C for 30 min, the stirring speed is 600 rpm, and naturally cooling to room temperature to obtain the lubricating oil for automobile engine.

[0100] Embodiment 8

[0101] The embodiment provides a lubricating oil for automobile engine, which comprises the following components in parts by mass:

[0102] 200 parts of base oil, 8 parts of metallocene polyalphaolefin, 7 parts of ethylene-propylene-diene rubber, 30 parts of zinc hexadecyl dithiocarbamate, 5 parts of zinc naphthenate, 25 parts of disodium ethylenediaminetetraacetate, 8 parts of polymethyl methacrylate and 30 parts of aluminum silicate;

[0103] The number average molecular weight of the ethylene-propylene-diene rubber is 70,000; and the number average molecular weight of the polymethyl methacrylate is 120,000;

[0104] The embodiment provides a preparation method of the lubricating oil for automobile engine, which comprises the following steps:

[0105] (1) heating and stirring base oil, zinc naphthenate, ethylene-propylene-diene rubber, polymethyl methacrylate and zinc hexadecyl dithiocarbamate at 44 DEG C for 35 min, the stirring speed is 600 rpm, cooling at 2 DEG C / min, standing at 27 DEG C for 6 min, and naturally cooling to 25 DEG C to obtain premix oil;

[0106] (2) the premixed oil is heated and stirred with the metallocene polyalphaolefin, the disodium ethylenediaminetetraacetate and the aluminum silicate at 70℃ for 50min, the stirring speed is 1000rpm, and the premixed oil is naturally cooled to room temperature to obtain the lubricating oil for automobile engine.

[0107] Example 9

[0108] The embodiment provides a lubricating oil for automobile engine, which comprises the following components in parts by mass:

[0109] 500 parts of base oil, 1 part of metallocene polyalphaolefin, 2 parts of ethylene-propylene-diene rubber, 10 parts of zinc hexadecyl dithiocarbamate, 1 part of zinc naphthenate, 10 parts of disodium ethylenediaminetetraacetate, 3 parts of polymethyl methacrylate and 30 parts of aluminum silicate;

[0110] The number average molecular weight of the ethylene-propylene-diene rubber is 120,000; and the number average molecular weight of the polymethyl methacrylate is 150,000.

[0111] The embodiment provides a preparation method of the lubricating oil for automobile engine, which comprises the following steps:

[0112] (1) the base oil, the zinc naphthenate, the ethylene-propylene-diene rubber, the polymethyl methacrylate and the zinc hexadecyl dithiocarbamate are heated and stirred at 65℃ for 15min, the stirring speed is 100rpm, the mixture is cooled at 1℃ / min, the mixture is statically placed at 27℃ for 5min, and the mixture is naturally cooled to 25℃ to obtain a premixed oil;

[0113] (2) the premixed oil is heated and stirred with the metallocene polyalphaolefin, the disodium ethylenediaminetetraacetate and the aluminum silicate at 35℃ for 10min, the stirring speed is 1000rpm, and the premixed oil is naturally cooled to room temperature to obtain the lubricating oil for automobile engine.

[0114] Example 10

[0115] The embodiment provides a lubricating oil for automobile engine, which comprises the following components in parts by mass:

[0116] 300 parts of base oil, 7 parts of metallocene polyalphaolefin, 5 parts of ethylene-propylene-diene rubber, 25 parts of zinc hexadecyl dithiocarbamate, 3 parts of zinc naphthenate, 12 parts of disodium ethylenediaminetetraacetate, 5 parts of polymethyl methacrylate and 15 parts of aluminum silicate;

[0117] The number average molecular weight of the ethylene-propylene-diene rubber is 80,000; and the number average molecular weight of the polymethyl methacrylate is 80,000.

[0118] The embodiment provides a preparation method of the lubricating oil for automobile engine, which comprises the following steps:

[0119] (1) The base oil, zinc naphthenate, ethylene-propylene rubber, poly methyl methacrylate and zinc hexadecyl dithiocarbamate were heated and stirred at 55℃ for 40 min, the stirring speed was 500 rpm, cooled at 2℃ / min, 27℃ for 8 min, and naturally cooled to 25℃, to obtain a premix oil;

[0120] (2) The premix oil was heated and stirred with metallocene poly alpha olefin, disodium ethylenediaminetetraacetate and aluminum silicate at 70℃ for 25 min, the stirring speed was 800 rpm, and naturally cooled to room temperature, to obtain a lubricating oil for automobile engine.

[0121] Comparative Example 1

[0122] The preparation method of the present comparative example was the same as that of Example 1, the only difference was that no metallocene poly alpha olefin was added.

[0123] Comparative Example 2

[0124] The preparation method of the present comparative example was the same as that of Example 1, the only difference was that no aluminum silicate was added.

[0125] Comparative Example 3

[0126] The preparation method of the present comparative example was the same as that of Example 1, the only difference was that no disodium ethylenediaminetetraacetate was added.

[0127] The lubricating oil for automobile engine of Examples 1-10 and Comparative Examples 1-3 was detected for low temperature wear resistance, the detection method referred to GB / T 12583-1990, the four-ball method was used, the initial temperature of the four-ball tester was 70℃, the speed was 1200 rpm, the load was 40 kgf, and the running time was 1 h, and the results were shown in Table 1.

[0128] Table 1 Performance detection results of the lubricating oil for automobile engine of Examples 1-10 and Comparative Examples 1-3

[0129] Item Wear scar diameter (pm) Example 1 279 Example 2 312 Example 3 304 Example 4 298 Example 5 286 Example 6 311 Example 7 322 Example 8 317 Example 9 338 Example 10 322 Comparative Example 1 389 Comparative Example 2 397 Comparative Example 3 395

[0130] As shown in Table 1, the lubricating oil for automobile engine prepared by the present application had good low temperature wear resistance, and could be used to protect automobile engine in cold environment.

[0131] As shown in the above examples, the lubricating oil for automobile engine provided by the present application had good low temperature wear resistance, was suitable for low temperature and extremely cold environment, especially for northern winter weather, northeast extremely cold area and plateau area, had wide application prospect, great market potential, and significant economic and social benefits.

[0132] Although the above embodiments have been described in detail, it should be understood that these are only some embodiments of the present application, but not all embodiments, and other embodiments can be obtained without creativity on the basis of the above embodiments, and these embodiments all belong to the protection scope of the present application.

Claims

1. A lubricating oil for automotive engines, characterized in that, The components are in the following parts by mass: 500 parts base oil, 10 parts metallocene polyalphaolefin, 7 parts ethylene propylene diene monomer (EPDM) rubber, 30 parts zinc hexadecyl dithiocarbamate, 5 parts zinc naphthenate, 25 parts disodium ethylenediaminetetraacetate, 8 parts polymethyl methacrylate, and 30 parts aluminum silicate. The number-average molecular weight of the ethylene propylene diene monomer (EPDM) rubber is 120,000; the number-average molecular weight of the polymethyl methacrylate (PMMA) is 150,000.

2. The method for preparing the lubricating oil for automobile engines according to claim 1 comprises the following steps: (1) The base oil, zinc naphthenate, ethylene propylene diene monomer (EPDM) rubber, polymethyl methacrylate (PMMA) and zinc hexadecyl dithiocarbamate are first heated and mixed to obtain a premixed oil; (2) The premixed oil is mixed with metallocene polyalphaolefin, disodium ethylenediaminetetraacetate and aluminum silicate by heating to obtain lubricating oil for automobile engines.

3. The preparation method according to claim 2, characterized in that, The temperature of the first heating mixture is 65 ℃, and the holding time is 15 min.

4. The preparation method according to claim 2 or 3, characterized in that, The first heating and mixing is the first stirring; the speed of the first stirring is 700 rpm.

5. The preparation method according to claim 2, characterized in that, The second heating mixture is heated to a temperature of 70 °C and held for 10 min.

6. The preparation method according to claim 2 or 5, characterized in that, The second heating and mixing is a second stirring; the stirring speed of the second stirring is 1000 rpm.