阅读说明：本技术 一种高分散持久抗积碳沉积型合成酯基础油及其制备方法 (High-dispersion lasting carbon deposition resistant synthetic ester base oil and preparation method thereof ) 是由 叶光华 王永垒 叶震南 李海云 姚武 杨益天 方少平 余亮 于 2020-12-22 设计创作，主要内容包括：本发明属于精细化工技术领域,具体涉及一种高分散持久抗积碳沉积型合成酯基础油,并进一步公开其制备方法。本发明所述高分散持久抗积碳沉积型合成酯基础油,以高活性聚异丁烯、马来酸酐、二乙烯三胺、二甲苯、蓖麻油酸、季戊四醇、异癸醇、正庚酸为主要原料合成的。本发明所述合成酯基础油产品中引入了超分散剂链段,且粘度范围及粘度指数较好,该基础油自身具有优良、持久的分散能力,不存在外加分散剂与基础油相容性变差的问题,其作为基础油使用时,可以将积碳、油泥等均匀持久地分散在基础油中,避免在金属表面发生沉积,从而以达到润滑油能实现更长时间的运行,可以较大程度地延长润滑油的使用寿命,具有重要的经济意义。(The invention belongs to the technical field of fine chemical engineering, and particularly relates to high-dispersion durable anti-carbon deposition type synthetic ester base oil and a preparation method thereof. The high-dispersion durable carbon deposition resistant synthetic ester base oil is synthesized by using high-activity polyisobutylene, maleic anhydride, diethylenetriamine, dimethylbenzene, ricinoleic acid, pentaerythritol, isodecanol and n-heptanoic acid as main raw materials. The synthetic ester base oil product of the invention is introduced with the chain segment of the hyper-dispersant, and has better viscosity range and viscosity index, the base oil has excellent and durable dispersing ability, and the problem of poor compatibility of the added dispersant and the base oil does not exist, when the synthetic ester base oil product is used as the base oil, carbon deposit, oil sludge and the like can be uniformly and durably dispersed in the base oil, and the deposition on the metal surface is avoided, so that the lubricating oil can run for a longer time, the service life of the lubricating oil can be prolonged to a greater extent, and the synthetic ester base oil product has important economic significance.)

1. The high-dispersion durable carbon deposition resistant synthetic ester base oil is characterized in that the preparation raw materials of the synthetic ester base oil comprise the following components in parts by mole:

2. the synthetic ester base oil with high dispersion, durability and carbon deposition resistance as claimed in claim 1, further comprising an esterification catalyst, wherein the amount of the esterification catalyst is 0.5-1.5 mol% of the total molar amount of the maleic anhydride;

the esterification catalyst comprises tetrabutyl titanate.

3. The synthetic ester base oil with high dispersion, durability and carbon deposition resistance as claimed in claim 1 or 2, further comprising a polymerization catalyst, wherein the amount of the polymerization catalyst is 1-2 mol% of the total molar amount of the maleic anhydride;

the polymerization catalyst comprises dibenzoyl peroxide.

4. A method for preparing the synthetic ester base oil with high dispersion, durability and carbon deposition resistance of any one of claims 1 to 3, which comprises the following steps:

(1) uniformly mixing the ricinoleic acid, the isodecyl alcohol and the esterification catalyst according to the formula ratio, and carrying out esterification reaction with water under a vacuum condition; when the acid value of the system mixture is less than 2mgKOH/g, stopping the reaction, removing excessive unreacted isodecyl alcohol, and collecting a reaction product containing isodecyl ricinoleate and an esterification catalyst for later use;

(2) mixing the high-activity polyisobutylene, maleic anhydride and partial xylene in a formula amount, adding a selected amount of the polymerization catalyst, carrying out heat preservation reaction, and stopping the reaction when the iodine value of the reaction mixture is less than 5g/100 g;

(3) continuously adding the diethylenetriamine with the formula amount, removing the dimethylbenzene, carrying out amination reaction, and stopping reaction when the acid value of the reaction mixture is less than 50 mgKOH/g;

(4) continuously adding the rest amount of the dimethylbenzene and the reaction product obtained in the step (1), uniformly mixing, continuously carrying out reflux water diversion esterification reaction, and stopping the reaction when the hydroxyl value of the reaction mixture is less than 3 mgKOH/g;

(5) continuously adding the pentaerythritol with the formula amount for esterification reaction, and stopping the reaction when the acid value of the reaction mixture is less than 2 mgKOH/g;

(6) and continuously adding the n-heptanoic acid with the formula amount, carrying out hydroxyl-terminated esterification reaction, stopping the reaction when the hydroxyl value of the reaction mixture is less than 2mgKOH/g, removing xylene and unreacted n-heptanoic acid, collecting the reactant, and carrying out post-treatment to obtain the required synthetic ester base oil.

5. The method for preparing a synthetic ester base oil with high dispersion, durability and carbon deposition resistance according to claim 4, wherein the esterification reaction temperature in the step (1) is 130-135 ℃, and the vacuum degree is-0.097-0.99 MPa.

6. The method for preparing a synthetic ester base oil with high dispersion, durability and carbon deposition resistance according to claim 4 or 5, wherein the temperature of the heat preservation reaction in the step (2) is 110-120 ℃.

7. The method for preparing a synthetic ester base oil with high dispersion durability and carbon deposition resistance according to any one of claims 4 to 6, wherein the temperature of the amination reaction in the step (3) is 160-165 ℃.

8. The method for preparing a synthetic ester base oil with high dispersion, durability and carbon deposition resistance according to any one of claims 4 to 7, wherein the temperature of the refluxing water-diversion esterification reaction in the step (4), the temperature of the esterification reaction step in the step (5) and the temperature of the capping esterification reaction step in the step (6) are controlled to be the refluxing temperature of the solvent of xylene.

9. The method for preparing a synthetic ester base oil with high dispersion, durability and carbon deposition resistance according to any one of claims 4 to 8, wherein in the step (6), the post-treatment step comprises a step of adding anhydrous sodium carbonate powder and activated clay for adsorption and a step of performing suction filtration treatment.

10. The method for preparing the synthetic ester base oil with high dispersion, durability and carbon deposition resistance according to any one of claims 4 to 9, wherein:

the dosage of the dimethylbenzene in the step (2) is 10-18 molar parts;

the dosage of the dimethylbenzene in the step (4) is 20-30 molar parts.

Technical Field

The invention belongs to the technical field of fine chemical engineering, and particularly relates to high-dispersion durable anti-carbon deposition type synthetic ester base oil and a preparation method thereof.

Background

The lubricating oil is a liquid or semisolid lubricating agent used on various types of automobiles and mechanical equipment to reduce friction and protect machines and workpieces, and mainly plays roles in lubrication, cooling, rust prevention, cleaning, sealing, buffering and the like. The conventional lubricating oil generally consists of two parts, namely base oil and additives, wherein the base oil is the main component of the lubricating oil and determines the basic properties of the lubricating oil, and the additives can make up and improve the defects in the performance aspect of the base oil and endow certain new performances, which are important components of the lubricating oil.

In the composition of conventional lubricating oils, the base oils are predominantly of the mineral or synthetic ester variety. However, mineral oil base oil generates a large amount of carbon deposition in a long-time high-temperature working environment, which is not favorable for an engine; although the synthetic ester base oil has better pour point and high temperature resistance than mineral oil, the synthetic ester base oil can be subjected to oxidative degradation after long-term use, and carbon deposition and oil sludge are generated. In order to improve the dispersing ability and the anti-carbon deposition performance of a lubricating oil system, an effective way is to disperse the generated carbon and oil sludge in the base oil and deposit the carbon and oil sludge on the metal surface as little as possible, and a common improvement way is to add a dispersing agent.

However, the externally added dispersant has only excellent dispersing performance, and cannot provide the conventional functions of the lubricating oil such as lubrication, low pour point, higher viscosity index and the like by itself, and the externally added dispersant cannot be added too much, on one hand, because the compatibility of the externally added dispersant with the base oil is limited, and the externally added dispersant is easy to separate out from the base oil system and cannot achieve the dispersing effect; on the other hand, when the dispersant is used at a high temperature for a long time, the dispersant itself is degraded, and thus the dispersant is separated from a base oil system, and the capability of dispersing carbon deposit and oil sludge in the base oil is reduced, so that the dispersant and the carbon deposit deposition resistance cannot be provided for the lubricating oil for a long time. Therefore, the development of a synthetic ester base oil with strong dispersibility and durable resistance to carbon deposition has positive significance.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to provide the synthetic ester base oil with high dispersion and long-lasting anti-carbon deposition, so as to solve the problems of insufficient dispersion capability and anti-carbon deposition performance of the lubricating oil system in the prior art;

the second technical problem to be solved by the present invention is to provide a method for preparing the synthetic ester base oil.

In order to solve the technical problems, the synthetic ester base oil with high dispersion, lasting carbon deposition resistance and deposition resistance, provided by the invention, is prepared from the following raw materials in parts by mole:

preferably, the Mn of the highly reactive polyisobutylene is about 1000.

Specifically, the high-dispersion durable carbon deposition resistant deposition type synthetic ester base oil also comprises an esterification catalyst, wherein the use amount of the esterification catalyst accounts for 0.5-1.5 mol% of the total molar amount of the maleic anhydride;

the esterification catalyst comprises tetrabutyl titanate.

Specifically, the high-dispersion durable carbon deposition resistant synthetic ester base oil also comprises a polymerization catalyst, wherein the amount of the polymerization catalyst accounts for 1-2 mol% of the total molar amount of maleic anhydride;

the polymerization catalyst comprises dibenzoyl peroxide.

The invention also discloses a method for preparing the high-dispersion durable carbon deposition resistant synthetic ester base oil, which comprises the following steps:

(1) uniformly mixing the ricinoleic acid, the isodecyl alcohol and the esterification catalyst according to the formula ratio, and carrying out esterification reaction with water under a vacuum condition; when the acid value of the system mixture is less than 2mgKOH/g, stopping the reaction, removing excessive unreacted isodecyl alcohol, and collecting a reaction product containing isodecyl ricinoleate and an esterification catalyst for later use;

(2) mixing the high-activity polyisobutylene, maleic anhydride and partial xylene in a formula amount, adding a selected amount of the polymerization catalyst, carrying out heat preservation reaction, and stopping the reaction when the iodine value of the reaction mixture is less than 5g/100 g;

(3) continuously adding the diethylenetriamine with the formula amount, removing the dimethylbenzene, carrying out amination reaction, and stopping reaction when the acid value of the reaction mixture is less than 50 mgKOH/g;

(4) continuously adding the rest amount of the dimethylbenzene and the reaction product obtained in the step (1), uniformly mixing, continuously carrying out reflux water diversion esterification reaction, and stopping the reaction when the hydroxyl value of the reaction mixture is less than 3 mgKOH/g;

(5) continuously adding the pentaerythritol with the formula amount for esterification reaction, and stopping the reaction when the acid value of the reaction mixture is less than 2 mgKOH/g;

(6) and continuously adding the n-heptanoic acid with the formula amount, carrying out hydroxyl-terminated esterification reaction, stopping the reaction when the hydroxyl value of the reaction mixture is less than 2mgKOH/g, removing xylene and unreacted n-heptanoic acid, collecting the reactant, and carrying out post-treatment to obtain the required synthetic ester base oil.

Specifically, in the step (1), the temperature of the esterification reaction is 130-135 ℃, and the vacuum degree is-0.097 to-0.99 MPa.

Specifically, in the step (2), the temperature of the heat preservation reaction is 110-.

Specifically, in the step (3), the temperature of the amination reaction is 160-165 ℃.

Specifically, the temperature of the refluxing water-diversion esterification reaction in the step (4), the temperature of the esterification reaction step in the step (5), and the temperature of the end-capping esterification reaction step in the step (6) are controlled to be the refluxing temperature (about 139 ℃) of the xylene solvent.

Specifically, in the step (6), the post-treatment step includes a step of adding anhydrous sodium carbonate powder and activated clay for adsorption, and a step of performing suction filtration treatment.

Specifically, the preparation method of the high-dispersion durable carbon deposition resistant synthetic ester base oil comprises the following steps:

the dosage of the dimethylbenzene in the step (2) is 10-18 molar parts;

the dosage of the dimethylbenzene in the step (4) is 20-30 molar parts.

The invention also discloses application of the high-dispersion durable anti-carbon deposition synthetic ester base oil in preparation of industrial lubricating oil.

The high-dispersion durable carbon deposition resistant synthetic ester base oil is synthesized by taking high-activity polyisobutylene, maleic anhydride, diethylenetriamine, xylene, ricinoleic acid, pentaerythritol, isodecyl alcohol and n-heptanoic acid as main raw materials, a hyperdispersant containing partial anhydride is prepared from the high-activity polyisobutylene, the maleic anhydride and the diethylenetriamine, then the hyperdispersant is subjected to chain extension reaction with the ricinoleic acid isodecyl ester and the pentaerythritol respectively, and the synthetic ester base oil is further subjected to esterification and end capping by the n-heptanoic acid. The high-dispersion durable anti-carbon deposition synthetic ester base oil product provided by the invention introduces a hyper-dispersant chain segment, has a good viscosity range and a good viscosity index, has excellent and durable dispersing ability, does not have the problem that the compatibility of an external dispersant and the base oil is poor, and can uniformly and durably disperse carbon deposition, oil sludge and the like in the base oil and avoid deposition on the metal surface when being used as the base oil, so that the lubricating oil can run for a longer time, the service life of the lubricating oil can be prolonged to a greater extent, and the high-dispersion durable anti-carbon deposition synthetic ester base oil product has important economic significance.

Detailed Description

In the following examples of the present invention, the high-activity polyisobutylene Mn is about 1000, and is available from petrochemical company of yangzi oil chemical ltd.

Example 1

The preparation raw materials of the high-dispersion durable carbon deposition resistant synthetic ester base oil comprise the following components in parts by mole:

3mol of high-activity polyisobutene;

9mol of maleic anhydride;

5mol of diethylenetriamine;

4mol of ricinoleic acid;

6mol of pentaerythritol;

6mol of isodecyl alcohol;

22mol of n-heptanoic acid;

32mol of dimethylbenzene;

0.18mol of dibenzoyl peroxide;

tetrabutyl titanate 0.12 mol.

The preparation method of the high-dispersion durable carbon deposition resistant synthetic ester base oil comprises the following steps:

(1) adding the ricinoleic acid, the isodecyl alcohol and the tetrabutyl titanate with the formula ratio into a reaction kettle, heating to 135 ℃, starting a vacuum system to carry out vacuum esterification reaction with water, and controlling the vacuum degree to be-0.098 Mpa; when the acid value of the system mixture is less than 2mgKOH/g, continuously heating to 170 ℃, carrying out negative pressure removal on excessive unreacted isodecyl alcohol under the vacuum degree of-0.098 Mpa, closing the vacuum system after no obvious material is evaporated, and cooling the mixture of the reaction product isodecyl ricinoleate and the catalyst to room temperature for later use;

(2) adding the high-activity polyisobutylene, maleic anhydride and part of xylene (11mol) in the formula amount into another reaction kettle, starting stirring, heating to 110 ℃, fully and uniformly mixing, adding the dibenzoyl peroxide in the formula amount for 3 times at intervals of 20min each time, and after all the dibenzoyl peroxide is added, carrying out heat preservation reaction at 110 ℃; sampling and detecting, and stopping reaction when the iodine value of the reaction mixture is less than 5g/100 g;

(3) continuously adding the diethylenetriamine with the formula amount into the reaction kettle, removing the xylene solvent and heating at the same time, heating to 165 ℃ within 1h, then preserving heat for amination reaction, and stopping the reaction when the acid value of the reaction mixture is less than 50 mgKOH/g;

(4) cooling the whole reaction system to 130 ℃, continuously adding the residual amount of xylene (21mol) and the mixture containing the isodecyl ricinoleate and the catalyst obtained in the step (1), stirring and mixing uniformly, carrying out reflux water diversion esterification reaction at about 139 ℃, and stopping the reaction when the hydroxyl value of the reaction mixture is less than 3 mgKOH/g;

(5) continuously adding the pentaerythritol with the formula amount, uniformly mixing, continuously carrying out esterification water-carrying reaction at about 139 ℃, and stopping the reaction when the acid value of the reaction mixture is less than 2 mgKOH/g;

(6) continuously adding the n-heptanoic acid with the formula amount, uniformly stirring, keeping the temperature at about 139 ℃ for continuously carrying out hydroxyl-terminated esterification reaction, starting a vacuum system when the hydroxyl value of the reaction mixture is less than 2mgKOH/g, keeping the vacuum degree at-0.098 Mpa, and gradually heating to 175 ℃ for fully removing the xylene solvent and the unreacted n-heptanoic acid; stopping reaction after no obvious substances are evaporated, cooling to room temperature, respectively adding anhydrous sodium carbonate powder accounting for 1% of the crude product of the synthetic ester and 5% of activated clay for adsorption treatment for 2 times, and then performing suction filtration to obtain the product.

The synthetic ester base oil product obtained in this example was a light yellow transparent liquid with a test viscosity index of 128.

Example 2

The preparation raw materials of the high-dispersion durable carbon deposition resistant synthetic ester base oil comprise the following components in parts by mole:

6mol of high-activity polyisobutene;

14mol of maleic anhydride;

4mol of diethylenetriamine;

6mol of ricinoleic acid;

8mol of pentaerythritol;

8mol of isodecyl alcohol;

30mol of n-heptanoic acid;

47mol of dimethylbenzene;

0.15mol of dibenzoyl peroxide;

tetrabutyl titanate 0.14 mol.

The preparation method of the high-dispersion durable carbon deposition resistant synthetic ester base oil comprises the following steps:

(1) adding the ricinoleic acid, the isodecyl alcohol and the tetrabutyl titanate with the formula ratio into a reaction kettle, heating to 130 ℃, starting a vacuum system to carry out vacuum esterification reaction with water, and controlling the vacuum degree to be-0.099 Mpa; when the acid value of the system mixture is less than 2mgKOH/g, continuously heating to 170 ℃, carrying out negative pressure removal on excessive unreacted isodecyl alcohol under the vacuum degree of-0.099 Mpa, closing the vacuum system after no obvious material is evaporated, and cooling the mixture of the reaction product isodecyl ricinoleate and the catalyst to room temperature for later use;

(2) adding the high-activity polyisobutylene, maleic anhydride and part of xylene (18mol) in the formula amount into another reaction kettle, starting stirring, heating to 120 ℃, fully and uniformly mixing, adding the dibenzoyl peroxide in the formula amount for 3 times at intervals of 20min each time, and after all the dibenzoyl peroxide is added, carrying out heat preservation reaction at 120 ℃; sampling and detecting, and stopping reaction when the iodine value of the reaction mixture is less than 5g/100 g;

(3) continuously adding the diethylenetriamine with the formula amount into the reaction kettle, removing the xylene solvent and heating at the same time, heating to 160 ℃ within 1h, then preserving heat for amination reaction, and stopping the reaction when the acid value of the reaction mixture is less than 50 mgKOH/g;

(4) cooling the whole reaction system to 135 ℃, continuously adding the residual amount of xylene (29mol) and the mixture containing the isodecyl ricinoleate and the catalyst obtained in the step (1), stirring and mixing uniformly, carrying out reflux water diversion esterification reaction at about 139 ℃, and stopping the reaction when the hydroxyl value of the reaction mixture is less than 3 mgKOH/g;

(5) continuously adding the pentaerythritol with the formula amount, uniformly mixing, continuously carrying out esterification water-carrying reaction at about 139 ℃, and stopping the reaction when the acid value of the reaction mixture is less than 2 mgKOH/g;

(6) continuously adding the n-heptanoic acid with the formula amount, uniformly stirring, keeping the temperature at about 139 ℃ for hydroxyl-terminated esterification reaction, starting a vacuum system when the hydroxyl value of the reaction mixture is less than 2mgKOH/g, keeping the vacuum degree at-0.098 Mpa, and gradually heating to 175 ℃ to fully remove the xylene solvent and unreacted n-heptanoic acid; stopping reaction after no obvious substances are evaporated, cooling to room temperature, respectively adding anhydrous sodium carbonate powder accounting for 1% of the crude product of the synthetic ester and 5% of activated clay for adsorption treatment for 2 times, and then performing suction filtration to obtain the product.

The synthetic ester base oil product obtained in this example was a pale yellow transparent liquid with a test viscosity index of 131.

Example 3

The preparation raw materials of the high-dispersion durable carbon deposition resistant synthetic ester base oil comprise the following components in parts by mole:

5mol of high-activity polyisobutene;

18mol of maleic anhydride;

7mol of diethylenetriamine;

7mol of ricinoleic acid;

9mol of pentaerythritol;

10mol of isodecyl alcohol;

35mol of n-heptanoic acid;

46mol of dimethylbenzene;

0.3mol of dibenzoyl peroxide;

tetrabutyl titanate 0.10 mol.

The preparation method of the high-dispersion durable carbon deposition resistant synthetic ester base oil comprises the following steps:

(1) adding the ricinoleic acid, the isodecyl alcohol and the tetrabutyl titanate with the formula ratio into a reaction kettle, heating to 133 ℃, starting a vacuum system to carry out vacuum esterification reaction with water, and controlling the vacuum degree to be-0.097 Mpa; when the acid value of the system mixture is less than 2mgKOH/g, continuously heating to 170 ℃, carrying out negative pressure removal on excessive unreacted isodecyl alcohol under the vacuum degree of-0.097 Mpa, closing the vacuum system after no obvious material is evaporated, and cooling the mixture of the reaction product isodecyl ricinoleate and the catalyst to room temperature for later use;

(2) adding the high-activity polyisobutylene, maleic anhydride and part of xylene (15mol) in the formula amount into another reaction kettle, starting stirring, heating to 115 ℃, fully and uniformly mixing, adding the dibenzoyl peroxide in the formula amount for 3 times at intervals of 20min each time, and after all the dibenzoyl peroxide is added, carrying out heat preservation reaction at 115 ℃; sampling and detecting, and stopping reaction when the iodine value of the reaction mixture is less than 5g/100 g;

(3) continuously adding the diethylenetriamine with the formula amount into the reaction kettle, removing the xylene solvent and heating at the same time, heating to 162 ℃ within 1h, then preserving heat for amination reaction, and stopping the reaction when the acid value of the reaction mixture is less than 50 mgKOH/g;

(4) cooling the whole reaction system to 135 ℃, continuously adding the rest amount of dimethylbenzene (25mol) and the mixture containing the isodecyl ricinoleate and the catalyst obtained in the step (1), stirring and mixing uniformly, carrying out reflux water diversion esterification reaction at about 139 ℃, and stopping the reaction when the hydroxyl value of the reaction mixture is less than 3 mgKOH/g;

(5) continuously adding the pentaerythritol with the formula amount, uniformly mixing, continuously carrying out esterification water-carrying reaction at about 139 ℃, and stopping the reaction when the acid value of the reaction mixture is less than 2 mgKOH/g;

(6) continuously adding the n-heptanoic acid with the formula amount, uniformly stirring, keeping the temperature at about 139 ℃ for hydroxyl-terminated esterification reaction, starting a vacuum system when the hydroxyl value of the reaction mixture is less than 2mgKOH/g, keeping the vacuum degree at-0.098 Mpa, and gradually heating to 175 ℃ to fully remove the xylene solvent and unreacted n-heptanoic acid; stopping reaction after no obvious substances are evaporated, cooling to room temperature, respectively adding anhydrous sodium carbonate powder accounting for 1% of the crude product of the synthetic ester and 5% of activated clay for adsorption treatment for 2 times, and then performing suction filtration to obtain the product.

The synthetic ester base oil product obtained in this example was a pale yellow transparent liquid with a test viscosity index of 132.

Example 4

The preparation raw materials of the high-dispersion durable carbon deposition resistant synthetic ester base oil comprise the following components in parts by mole:

4mol of high-activity polyisobutylene;

12mol of maleic anhydride;

6mol of diethylenetriamine;

5mol of ricinoleic acid;

10mol of pentaerythritol;

7mol of isodecyl alcohol;

40mol of n-heptanoic acid;

46mol of dimethylbenzene;

0.18mol of dibenzoyl peroxide;

tetrabutyl titanate 0.12 mol.

The preparation method of the synthetic ester base oil with high dispersion, lasting carbon deposition resistance and deposition resistance is the same as that in example 3.

The synthetic ester base oil product obtained in this example was a pale yellow transparent liquid with a viscosity index of 135.

Example 5

The preparation raw materials of the high-dispersion durable carbon deposition resistant synthetic ester base oil comprise the following components in parts by mole:

5mol of high-activity polyisobutene;

12mol of maleic anhydride;

5mol of diethylenetriamine;

6mol of ricinoleic acid;

5mol of pentaerythritol;

8mol of isodecyl alcohol;

20mol of n-heptanoic acid;

30mol of dimethylbenzene;

0.12mol of dibenzoyl peroxide;

tetrabutyl titanate 0.08 mol.

The preparation method of the synthetic ester base oil with high dispersion, lasting carbon deposition resistance and deposition resistance is the same as that in example 3.

The synthetic ester base oil product obtained in this example was a light yellow transparent liquid with a test viscosity index of 127.

Comparative example 1

This comparative example uses a commercially available pentaerythritol tetraheptanoate base oil as a comparative example.

Comparative example 2

In this comparative example, a commercially available pentaerythritol tetraheptanoate base oil plus 2% dispersant (type 154A, Liaoning Ninghe chemical Co., Ltd.) was used as a comparative example.

Comparative example 3

In this comparative example, a commercially available pentaerythritol tetraheptanoate base oil plus 4% dispersant (type 154A, Liaoning Ninghe chemical Co., Ltd.) was used as a comparative example.

Comparative example 4

In this comparative example, a commercially available pentaerythritol tetraheptanoate base oil plus 8% dispersant (type 154A, Liaoning Dengyi chemical Co.) was used as a comparative example.

Examples of the experiments

The base oil systems of comparative examples 1-4, grades 1-5 above, were tested for performance, respectively, by the methods comprising:

the iodine value is measured according to a method for measuring the iodine value of GB/T5532-2008 animal and plant oil and fat;

the viscosity measurement is based on GB-T265-88 petroleum product kinematic viscosity measurement method and dynamic viscometer algorithm;

the viscosity index is determined according to the GB/T1995 petroleum product viscosity index calculation method;

the dispersing ability and the lasting anti-carbon deposition ability of the base oil are reflected in the conditions of adhesive weight, deposition of carbon on a metal plate, dispersion of carbon on the base oil and the like according to SH/T0300-92 crankcase simulation test method (QZX method), wherein the preparation method for testing the base oil comprises the following steps: 20% of waste lubricating oil containing carbon deposit and oil sludge + 80% of new base oil (mass ratio), wherein the same batch of waste lubricating oil is used for preparing the sample effects of the test examples and the comparative examples.

The results of the tests are shown in table 1 below,

table 1 product Performance test results

The results in the table show that the synthetic ester base oil prepared by the method has a high viscosity index which is basically over 125, good viscosity-temperature performance, and particularly good capability of dispersing and resisting deposition of durable carbon deposition, can still play a good role in dispersing carbon deposition and oil sludge for a long time in a test system of waste lubricating oil containing carbon deposition and oil sludge, can hardly generate deposition or a very small amount of deposition on a metal plate for a long time (such as 200 ℃/240h or 240 ℃/120h), can be stably and uniformly dispersed in a lubricating oil system all the time, and hardly generates deposition after standing for 24 h.

In comparative examples 1-4, a blank of pentaerythritol tetraheptanoate base oil was used, and 2%, 4%, and 8% of dispersants were added to disperse carbon and oil sludge, respectively, wherein 8% was added in excess. The test result shows that the addition of 4 percent of the dispersant is most suitable, the addition of no dispersant or little dispersant can cause the insufficient dispersing ability to obviously cause carbon deposition on a metal plate, the excessive addition of the comparative example 4 can reduce the compatibility of the dispersant and the base oil, so the insufficient compatibility is easy to occur under the high-temperature state for a long time, and the carbon deposition dispersing ability is slightly reduced, although the addition of the dispersant has a certain carbon deposition dispersing effect, the dispersing ability and the durable carbon deposition resistance under the high-temperature state for a long time are far lower than those of the product of the invention.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.