CN111187649B - Trimellitate lubricating oil base oil based on block polyester chemical modification and preparation method thereof - Google Patents
Trimellitate lubricating oil base oil based on block polyester chemical modification and preparation method thereof Download PDFInfo
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- CN111187649B CN111187649B CN202010080376.3A CN202010080376A CN111187649B CN 111187649 B CN111187649 B CN 111187649B CN 202010080376 A CN202010080376 A CN 202010080376A CN 111187649 B CN111187649 B CN 111187649B
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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
- C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
- C10M107/20—Lubricating compositions characterised by the base-material being a macromolecular compound containing oxygen
- C10M107/30—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M107/32—Condensation polymers of aldehydes or ketones; Polyesters; Polyethers
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/91—Polymers modified by chemical after-treatment
- C08G63/912—Polymers modified by chemical after-treatment derived from hydroxycarboxylic acids
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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
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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
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/102—Polyesters
- C10M2209/1023—Polyesters 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
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
- C10M2209/105—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing three carbon atoms only
- C10M2209/1055—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing three carbon atoms only used as base material
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Abstract
The invention relates to the field of lubricating oil, and discloses trimellitate lubricating oil base oil based on block polyester chemical modification and a preparation method thereof. The preparation method comprises the following steps: (1) synthesizing linear block polyester, namely adding epsilon-CL and PO or DVL into TBT serving as an initiator, reacting for 2-24 hours at room temperature to synthesize four-arm star-shaped polyester, and then adding HCl solution to initiate the four-arm star-shaped polyester to perform hydrolysis reaction to obtain linear block polyester; (2) and (2) synthesizing the modified trimellitate lubricating oil base oil, adding TMA and the linear block polyester obtained in the step (1), reacting to obtain an embedded polymer intermediate, adding saturated monohydric alcohol, and performing esterification reaction under the action of a catalyst to obtain block-type modified TMT lubricating oil base oil. The method modifies the TMT base oil from the chemical structure, improves the viscosity-temperature performance of the TMT, and simultaneously reduces the adverse effect of the embedded polyester on the low-temperature performance of the base oil to the maximum extent.
Description
Technical Field
The invention relates to the field of lubricating oil, in particular to trimellitate lubricating oil base oil based on block polyester chemical modification and a preparation method thereof.
Background
Trimellitic acid esters (TMT) are mainly used as plasticizers in the plastics industry and have a wide range of applications in the paint industry. In addition, because TMT has low cost, high thermal stability and low volatilization loss, the TMT is also used as high-temperature chain oil. However, as a lubricating oil product, the existence of benzene rings in the TMT structure leads to poor viscosity-temperature performance of TMT lubricating oil base oil, and the development space and market prospect of the TMT lubricating oil base oil are severely restricted. With international surplus of trimellitic anhydride (TMA) production and TMT high-value-added downstream fine chemical product development facing dilemma, high-value-added lubricating oil products with excellent performance meet opportunities and challenges.
Limited by the difference in TMT viscosity index and the current state of commercial confidentiality, few methods have been reported for the synthesis of TMT lubricant base oils having excellent properties. At present, TMT products are mainly obtained by the direct reaction of trimellitic acid esters and long-chain alkyl monohydric alcohols, and by compounding with viscosity index modifiers, lubricating base oils which can be used for high-temperature chain oils. However, as the viscosity of the product increases, the viscosity index of the high-viscosity oil product decreases more seriously, and the lubricating performance of the base oil is reduced by the antagonistic action generated between the viscosity index modifier and other additives.
Because the number of ester groups in ester molecules and the length and the structure of a carbon chain have great influence on the viscosity and the viscosity index of the ester base oil, the polyester with excellent biodegradability can be embedded into the molecular structure of the base oil, the quality and the performance of the base oil are improved through structural design, the problem of low viscosity index of the base oil is solved, the application field of the base oil is expanded, and the market added value of the base oil is increased. However, some polyesters, such as Polycaprolactone (PCL) and Polypentanolactone (PVL), are semi-crystalline polymers, and the low temperature properties of the base oil can be adversely affected by the incorporation of a single polymer.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a segmented polyester-based chemically modified trimellitate lubricating base oil and a preparation method thereof.
In order to achieve the purpose of the invention, the preparation method of the lubricating oil base oil based on the block polyester chemically modified trimellitate comprises the following steps:
(1) synthesizing linear block polyester, namely adding delta-caprolactone (epsilon-CL) and Propylene Oxide (PO) or delta-caprolactone (epsilon-CL) and delta-valerolactone (DVL) into tetrabutyl titanate (TBT) serving as an initiator, reacting for 2-24 hours at room temperature to synthesize four-arm star-shaped polyester, and then adding HCl solution to initiate the four-arm star-shaped polyester to perform hydrolysis reaction to obtain linear block polyester;
(2) synthesizing modified trimellitate lubricating oil base oil, adding trimellitic anhydride (TMA) and the linear block polyester obtained in the step (1) to react to obtain an embedded polymer intermediate, adding saturated monohydric alcohol, and performing esterification reaction under the action of a catalyst to obtain block Type Modified Trimellitate (TMT) lubricating oil base oil.
Further, in the step (1), tetrabutyl titanate (TBT): delta-caprolactone (. epsilon. -CL): propylene Oxide (PO) or delta-valerolactone (DVL) in a molar ratio of 1: (4-20): (4-20).
Further, in the step (1), the raw materials of tetrabutyl titanate (TBT), delta-caprolactone (epsilon-CL) and Propylene Oxide (PO) or delta-valerolactone (DVL) are fed step by step or at one time.
Further, in the step (1), the HCl solution is 8-12% (v/v) HCl solution.
Further, after the hydrolysis reaction in the step (1) is finished, adding an organic solvent, standing and layering, repeatedly washing the lower layer liquid by deionized water to remove hydrochloric acid in the solution until the pH value reaches neutrality, and then removing the organic solvent and the deionized water to obtain the linear block polyester.
Further, the organic solvent is dichloromethane or trichloromethane.
Further, in the step (2), the reaction temperature of trimellitic anhydride (TMA) and the linear block polyester is 40-120 ℃, and the reaction time is 2-8 hours.
Further, in the step (2), the saturated monohydric alcohol is any one or more of saturated alcohols with carbon atoms of 2-18.
Further, the catalyst in the step (2) is a supported Lewis acid or a solid acid catalyst.
Further, in the step (2), the reaction temperature of the embedded polymer intermediate and the saturated monohydric alcohol is 140 ℃ to 220 ℃, and the reaction time is 6 to 10 hours.
In the invention, the room temperature is 20-25 ℃, and the temperature can be finely adjusted on the premise of ensuring that the reaction can be carried out.
Compared with the prior art, the invention has the following advantages:
(1) the viscosity index of the base oil of the TMT lubricating oil is improved to more than 100 from 8, the viscosity-temperature performance can reach the level (more than 90) of the lubricating oil with high viscosity index, and even the index (more than 120) of the special lubricating oil with high viscosity index is met;
(2) the segmented polyester can ensure the high viscosity-temperature performance of the modified base oil, and also reduce the adverse effect of a single polyester embedded chain on the low-temperature performance of the base oil, and the low-temperature performance of the modified base oil is not greatly adversely affected;
(3) compared with the unmodified TMT lubricating oil base oil, the thermal stability of the modified base oil is improved;
(4) because PCL has good compatibility, the biodegradability of the base oil can be improved so as to meet the requirement of green lubricating oil.
Drawings
FIG. 1 is a flow chart of a synthetic process for synthesizing block-type modified TMT base oil by using epsilon-CL and PO as raw materials;
FIG. 2 is a FT-IR test of the modified TMT base oil obtained in example 1, wherein (1) is trimellitic anhydride, (2) is a polymer intermediate product, and (3) is a modified trimellitic ester;
FIG. 3 is a nuclear magnetic hydrogen spectrum comparison of the modified TMT base oil obtained in example 2 with that of unmodified TMT;
FIG. 4 is a graph showing the comparison of thermal stability TG of unmodified TMT and P (CL-PO) modified TMT obtained in example 2.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. The technical features of the embodiments of the present invention may be combined with each other as long as they do not conflict with each other.
In the invention, tetrabutyl titanate is used as an initiator, and caprolactone (epsilon-CL) and valerolactone (DVL) or Propylene Oxide (PO) are respectively initiated to carry out ring-opening polymerization under the room temperature condition according to a certain proportion to form a four-arm star-shaped block polyester structure; then adding HCl aqueous solution to carry out hydrolysis reaction to obtain linear hydroxyl-terminated block polyester; then obtaining a carboxyl-terminal intermediate product through the reaction of trimellitic anhydride and linear hydroxyl-terminal block polyester; and carrying out esterification reaction on the intermediate product and monohydric alcohol to obtain the block polyester modified trimellitate lubricating oil base oil. By adjusting the molar ratio of tetrabutyl titanate (TBT), delta-caprolactone (epsilon-CL) and Propylene Oxide (PO) or delta-valerolactone (DVL), linear polyesters with different polymerization degrees can be obtained, thereby obtaining the TMT lubricating oil base oil with different embedded lengths and structures, and the chemical formula is as follows:
wherein n is 4-20, and m is 4-20.
Taking delta-caprolactone (. epsilon. -CL) and Propylene Oxide (PO) as examples, the synthetic process is shown in the attached FIG. 1, and it should be understood by those skilled in the art that the reaction conditions shown in the attached FIG. 1 are only illustrative and should not be construed as limiting the technical scheme of the present invention.
Example 1
A block P (CL-PO) modified TMT lubricating oil base oil synthesis method comprises the following steps:
0.02mol of tetrabutyl titanate (TBT) and 0.16mol of delta-caprolactone (. epsilon. -CL) are initially added in molar proportionSealing the three-necked bottle with a glass plug in a 250mL three-necked bottle, reacting for 2h at 25 ℃, adding 0.16mol of Propylene Oxide (PO) into the system, and continuing to react for 24h at room temperature; after the reaction is finished, removing a small amount of unreacted Propylene Oxide (PO) by decompression; then 40mL of HCl solution containing 10% (v/v) is added into a three-neck flask, and linear block polyester and solid TiO are obtained through hydrolysis reaction2Wait for TiO2Stopping the reaction when the hydrolysis is not separated out; adding 20mL of dichloromethane, then adding the mixed system into a separating funnel, standing for layering, transferring the lower-layer linear polyester L-P (CL-PO) into the separating funnel, and repeatedly washing with deionized water for several times to remove hydrochloric acid in the solution until the pH value reaches neutrality; then removing dichloromethane and deionized water under reduced pressure at 60 ℃ to obtain linear polyester L-P (CL-PO); adding trimellitic anhydride (TMA) according to a certain molar ratio, wherein TMA is L-P (CL-PO) which is 1.1:1, and reacting for 4 hours under reduced pressure at the temperature of 120 ℃ to obtain an embedded polymer intermediate; removing the pressure reducing device, erecting a water separator and a condensing device, adding excessive isobutanol and 1 percent (based on the total mass of reactants) of catalyst, and carrying out esterification reaction for 8 hours at 180 ℃. After the reaction is finished, removing residual isobutanol at 100 ℃ by a reduced pressure distillation mode, removing the catalyst by a filtration mode to obtain the block P (CL-PO) modified TMT lubricating oil base oil, wherein the viscosity index is increased from 8 to 105.
FIG. 2 shows TMA infrared spectrum at 1775cm-1And 1694cm-1Two carbonyl peaks are characteristic acid anhydride peaks; (2) for the reaction of TMA with the linear block polyester to give an embedded polymer intermediate, it was found by (2) that 1775cm above TMA-1And 1694cm-1Two characteristic peaks of carbonyl groups disappear, and the corresponding peak is at 1721cm-1Generates a carbonyl stretching vibration peak at 2946cm-1And 2866cm-1A new stretching vibration peak is generated and is a methyl methylene stretching vibration peak in the ester group, which is caused by the esterification reaction of trimellitic anhydride and linear block polyester; (3) compared with (2), 3542cm is a target product obtained by esterification reaction of an embedded polymer intermediate and saturated monohydric alcohol-1The vibration peak of carboxyl group at (b) disappeared. (3) No hydroxyl vibration absorption peak appears in the product, and the partial benzene is illustrated on the one handThe tricarboxylic anhydride completely reacts with the hydroxyl-terminated linear block polyester without residual hydroxyl groups; on the other hand, the second esterification process is proved to be thorough, so that no-OH and-COOH absorption vibration peaks appear, and the synthesis process is feasible.
Example 2
A block P (CL-PO) modified TMT lubricating oil base oil synthesis method comprises the following steps:
firstly, adding 0.02mol of tetrabutyl titanate (TBT) and 0.08mol of delta-caprolactone (epsilon-CL) into a 250mL three-necked bottle according to a molar ratio, sealing the bottle with a glass stopper, reacting for 2 hours at 25 ℃, then adding 0.08mol of Propylene Oxide (PO) into the system, and continuing to react for 24 hours at room temperature; after the reaction is finished, removing a small amount of unreacted Propylene Oxide (PO) by decompression; then 40mL of HCl solution containing 10% (v/v) is added into a three-neck flask, and linear block polyester and solid TiO are obtained through hydrolysis reaction2Wait for TiO2Stopping the reaction when the hydrolysis is not separated out; adding 20mL of dichloromethane, then adding the mixed system into a separating funnel, standing for layering, transferring the lower-layer linear polyester L-P (CL-PO) into the separating funnel, and repeatedly washing with deionized water for several times to remove hydrochloric acid in the solution until the pH value reaches neutrality; then removing dichloromethane and deionized water under reduced pressure at 60 ℃ to obtain linear polyester L-P (CL-PO); adding trimellitic anhydride (TMA) according to a certain molar ratio, wherein TMA is L-P (CL-PO) which is 1.1:1, and reacting for 4 hours under reduced pressure at the temperature of 120 ℃ to obtain an embedded polymer intermediate; adding isooctanol and 1% of catalyst (based on the total mass of reactants) according to a molar ratio to ensure that the polymer intermediate is completely esterified to obtain the block P (CL-PO) modified TMT lubricant base oil, wherein the viscosity index is increased from 8 to 117, and the obtained block P (CL-PO) modified TMT lubricant base oil conforms to the following chemical formula:
wherein n is 4-20, and m is 4-20.
As can be seen by combining the above chemical formulas and FIG. 3, the chemical shifts δ are-CH methine peaks on the benzene ring skeleton at 8.38(s,1H), 8.16(s,1H), 7.72(s,1H) and 4.29(m,1H) in the PO groups embedded in the polyester, respectively; delta 3.81(2,2H), 2.25(t,2H) are the most characteristic variation of methylene peak b and g in the insertion chain respectively; in addition, the characteristic peak of the modified base oil has continuously changed multiple methylene vibration peaks in the range of delta (1.2-2.1). Experimental data show that the process route of embedding the linear block polyester into the molecular structure of the TMT lubricating oil is feasible through TMT nuclear magnetic comparison before and after modification.
Example 3
A preparation method of block P (CL-VL) modified TMT nano lubricating oil base oil comprises the following steps:
firstly, adding 0.02mol of tetrabutyl titanate (TBT) and 0.16mol of delta-caprolactone (. epsilon. -CL) into a 250mL three-necked bottle according to mol ratio, sealing the bottle with a glass plug, reacting for 2 hours at 25 ℃, then adding 0.16mol of delta-valerolactone (DVL) into the system, and continuing to react for 6 hours at room temperature; then 40mL of HCl solution containing 10% (v/v) is added into a three-neck flask, and linear block polyester and solid TiO are obtained through hydrolysis reaction2Wait for TiO2Stopping the reaction when the hydrolysis is not separated out; adding 20mL of dichloromethane, then adding the mixed system into a separating funnel, standing for layering, transferring the lower-layer linear polyester L-P (CL-VL) into the separating funnel, and repeatedly washing with deionized water for several times to remove hydrochloric acid in the solution until the pH value reaches neutrality; then removing dichloromethane and deionized water under reduced pressure at 60 ℃ to obtain linear polyester L-P (CL-VL); adding TMA according to a certain molar ratio, wherein TMA is L-P (CL-VL) and is 1.1:1, and reacting for 4 hours under reduced pressure at 120 ℃ to obtain an embedded polymer intermediate; removing the pressure reducing device, erecting a water separator and a condensing device, adding excessive isobutanol and 1% of catalyst (based on the total mass of reactants), and carrying out esterification reaction for 8 hours at 180 ℃. After the reaction is finished, removing residual isobutanol at 100 ℃ by a reduced pressure distillation mode, removing the catalyst by a filtration mode, and obtaining the block P (CL-VL) modified TMT lubricating oil base oil with the viscosity index rising from 8 to 102.
Example 4
A preparation method of block P (CL-VL) modified TMT nano lubricating oil base oil comprises the following steps:
firstly, 0.02mol of tetrabutyl titanate (TBT), 0.08mol of delta-caprolactone (epsilon-CL) and 0.08mol of delta-valerolactone (DVL) are mixed and added into a 250mL three-necked bottle according to mol ratio, and the mixture is continuously reacted for 6h at room temperature; then 40mL of HCl solution containing 10% (v/v) is added into a three-neck flask, and linear block polyester and solid TiO are obtained through hydrolysis reaction2Wait for TiO2Stopping the reaction when the hydrolysis is not separated out; adding 20mL of dichloromethane, then adding the mixed system into a separating funnel, standing for layering, transferring the lower-layer linear polyester L-P (CL-VL) into the separating funnel, and repeatedly washing with deionized water for several times to remove hydrochloric acid in the solution until the pH value reaches neutrality; then removing dichloromethane and deionized water under reduced pressure at 60 ℃ to obtain linear polyester L-P (CL-VL); adding TMA according to a certain molar ratio, wherein TMA is L-P (CL-VL) and is 1.1:1, and reacting for 4 hours under reduced pressure at 120 ℃ to obtain an embedded polymer intermediate; removing the pressure reducing device, erecting a water separator and a condensing device, adding excessive isobutanol and 1% of catalyst (based on the total mass of reactants), and carrying out esterification reaction for 8 hours at 180 ℃. After the reaction is finished, removing residual isobutanol at 100 ℃ by a reduced pressure distillation mode, removing the catalyst by a filtration mode, and obtaining the block P (CL-VL) modified TMT lubricating oil base oil with the viscosity index rising from 8 to 108.
According to the invention, a block linear polyester structure is introduced into a modified TMT molecular structure, and a curled linear polymer molecule expands and elongates along with the rise of temperature, so that the viscosity-temperature performance of an oil molecule is greatly improved. However, as a semi-crystalline polymer, the crystallization ability of the modified TMT lubricant base oil becomes stronger with the increase of the content of the single polyester, and once the polymer is crystallized, the flexibility thereof is greatly reduced, resulting in the reduction of the low-temperature fluidity of the modified base oil. The block polymer effectively reduces the content of single polymer and reduces the adverse effect of embedded chains on the low-temperature performance of the modified base oil.
FIG. 4 is a comparison graph of thermal stability TG of unmodified and P (CL-PO) modified TMT, and experimental results show that the initial oxidative decomposition of the P (CL-PO) modified TMT lubricant base oil is improved, the thermal stability of the P (CL-PO) modified TMT lubricant base oil is more excellent than that of PCL (n-4) modified TMT lubricant base oil with the same chain length, and the thermal stability of the modified TMT is better than that of the unmodified TMT lubricant base oil. The inventors further compared the effect of embedded chain length on P (CL-PO) modified TMT lubricating performance, and the results are shown in Table 1.
TABLE 1 Effect of embedded chain length on P (CL-PO) modified TMT lubricity
It will be understood by those skilled in the art that the foregoing is only exemplary of the present invention, and is not intended to limit the invention, which is intended to cover any variations, equivalents, or improvements therein, which fall within the spirit and scope of the invention.
Claims (10)
1. The block polyester chemical modification-based trimellitate lubricating base oil is characterized in that the chemical formula of the block polyester chemical modification-based trimellitate lubricating base oil is as follows:
wherein n is 4-20, and m is 4-20.
2. The method for preparing the trimellitate ester lubricant base oil based on the block polyester chemical modification of claim 1, wherein the method comprises the following steps:
(1) synthesizing linear block polyester, namely adding delta-caprolactone (epsilon-CL) and Propylene Oxide (PO) or delta-caprolactone (epsilon-CL) and delta-valerolactone (DVL) into tetrabutyl titanate (TBT) serving as an initiator, reacting for 2-24 hours at room temperature to synthesize four-arm star-shaped polyester, and then adding HCl solution to initiate the four-arm star-shaped polyester to perform hydrolysis reaction to obtain linear block polyester;
(2) synthesizing modified trimellitate lubricating oil base oil, adding trimellitic anhydride (TMA) and the linear block polyester obtained in the step (1) to react to obtain an embedded polymer intermediate, adding saturated monohydric alcohol, and performing esterification reaction under the action of a catalyst to obtain block Type Modified Trimellitate (TMT) lubricating oil base oil.
3. The method for preparing the trimellitate ester lubricant base oil based on block polyester chemical modification according to claim 2, wherein in the step (1), tetrabutyl titanate (TBT): delta-caprolactone (. epsilon. -CL): propylene Oxide (PO) or delta-valerolactone (DVL) in a molar ratio of 1: (4-20): (4-20).
4. The method for preparing trimellitate ester lubricant base oil based on block polyester chemical modification according to claim 2, wherein in the step (1), the HCl solution is 8-12% (v/v) HCl solution.
5. The preparation method of the trimellitate ester lubricant base oil based on block polyester chemical modification according to claim 2, wherein the organic solvent is added after the hydrolysis reaction in step (1) is completed, then the mixture is allowed to stand for delamination, the lower layer liquid is repeatedly washed by deionized water to remove hydrochloric acid in the solution until the pH value reaches neutral, and then the organic solvent and the deionized water are removed to obtain the linear block polyester.
6. The method for preparing the trimellitate ester lubricant base oil based on the block polyester chemical modification of claim 5, wherein the organic solvent is dichloromethane or chloroform.
7. The method for preparing trimellitate ester lubricant base oil based on block polyester chemical modification according to claim 2, wherein in the step (2), the reaction temperature of trimellitic anhydride (TMA) and linear block polyester is 40-120 ℃ and the reaction time is 2-8 hours.
8. The method for preparing the trimellitate ester lubricant base oil based on block polyester chemical modification according to claim 2, wherein in the step (2), the saturated monohydric alcohol is any one or more of saturated alcohols with carbon atoms of 2-18.
9. The method for preparing the trimellitate ester lubricant base oil based on the block polyester chemical modification of claim 2, wherein the catalyst in the step (2) is a supported Lewis acid or a solid acid catalyst.
10. The method for preparing the trimellitate ester lubricant base oil based on block polyester chemical modification as defined in claim 2, wherein in the step (2), the reaction temperature of the embedded polymer intermediate and the saturated monohydric alcohol is 140-220 ℃, and the reaction time is 6-10 hours.
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