阅读说明：本技术 一种在低粘度基础油中原位制备的粘度指数改进剂浓缩液及其制备方法 (Viscosity index improver concentrated solution prepared in situ in low-viscosity base oil and preparation method thereof ) 是由 李嵬 陈二中 燕晓宇 刘晓杰 鄂彦鹏 卢俊典 刘歌 孙梦垚 张娇 于胜楠 于 2021-06-30 设计创作，主要内容包括：本发明涉及应用于润滑油的粘度指数改进剂浓缩液,特别是涉及一种在低粘度基础油中原位制备的粘度指数改进剂浓缩液(星形氢化苯乙烯(S)-异戊二烯(I)-丁二烯(B)三元共聚物粘度指数改进剂的浓缩液)及其制备方法。星形粘度指数改进剂的合成在低粘度基础油中单体占体系5wt％-15wt％浓度下进行聚合、加氢、脱灰,直接得到粘度指数改进剂浓缩液。本发明在低粘度基础油中原位合成星形粘度指数改进剂的方法,减少了粘度指数改进剂传统合成方法中溶剂脱除、溶剂回收、产品干燥、再溶解等工序,降低了生产成本,保证了产品质量。本发明还提供了在低粘度基础油中原位制备的粘度指数改进剂浓缩液的制备方法。(The invention relates to a viscosity index improver concentrated solution applied to lubricating oil, in particular to a viscosity index improver concentrated solution (concentrated solution of a star-shaped hydrogenated styrene (S) -isoprene (I) -butadiene (B) terpolymer viscosity index improver) prepared in situ in low-viscosity base oil and a preparation method thereof. The synthesis of the star viscosity index improver is carried out by polymerizing, hydrogenating and deashing under the condition that the monomer accounts for 5-15 wt% of the system in the low-viscosity base oil, and directly obtaining the viscosity index improver concentrated solution. The method for synthesizing the star-shaped viscosity index improver in situ in the low-viscosity base oil reduces the procedures of solvent removal, solvent recovery, product drying, redissolution and the like in the traditional synthesis method of the viscosity index improver, reduces the production cost and ensures the product quality. The invention also provides a process for the preparation of the viscosity index improver concentrate prepared in situ in a low viscosity base oil.)

1. A process for preparing a viscosity index improver concentrate in situ in a low viscosity base oil, characterized in that: the synthesis of the star viscosity index improver is carried out by polymerizing, hydrogenating and deashing under the condition that the monomer accounts for 5-15 wt% of the system in the low-viscosity base oil, and directly obtaining the viscosity index improver concentrated solution.

2. The process according to claim 1, wherein:

a: adding isoprene and butadiene into base oil, adding an alkyl lithium initiator, initiating polymerization at 20-90 ℃, and reacting to obtain an isoprene and butadiene random copolymer I/B when the conversion rate of the isoprene and the butadiene exceeds 95%; adding styrene, and continuing to react at 20-90 ℃ until the conversion rate of the styrene exceeds 95% to obtain an I/B-S two-block polymer; wherein, when preparing I/B, the mass ratio of the total monomer to the 2cst base oil is 1:4-1: 19; the addition amount of alkyl lithium is 1X 10^-3-1×10^-2mol/100g total monomer, the mass ratio of I to B is 3:7-7:3, and the mass ratio of I/B to S is 98:2-90: 10;

b: after the I/B-S two-block polymer is obtained, adding a coupling agent into the system to react at the temperature of 20-90 ℃, and when the conversion rate of the coupling agent exceeds 95%, adding isopropanol into the system to terminate the coupling reaction to obtain a base adhesive, namely a star-shaped block copolymer (I/B-S)_n-C; wherein the molar ratio of the coupling agent to the alkyl lithium is 3:1-20: 1; the molar ratio of isopropanol to alkyllithium is 1: 1;

c: adding a hydrogenation catalyst into the base oil solution of the base adhesive, uniformly mixing, introducing hydrogenation, and carrying out hydrogenation reaction at the temperature of 40-90 ℃ and the hydrogen pressure of 1.0-6.0 MPa; after the hydrogenation reaction is finished, adding solid acid and hydrogen peroxide to separate out the hydrogenation catalyst in a solid form, and removing the catalyst waste residues on a high-speed centrifuge in a layering manner to obtain a concentrated solution of the viscosity index improver.

3. The process according to claim 1, wherein: the base oil solvent is one or two of I type, II type, III type and IV type base oil with the viscosity of 1-5 cst.

4. The process according to claim 1, wherein: the molecular formula of the alkyl lithium is RLi, and R is a hydrocarbon group with 4-20 carbon atoms; the coupling agent is an epoxy compound or a diene compound.

5. The process according to claim 1, wherein: the hydrogenation catalyst is a main catalyst and a cocatalyst; the main catalyst is nickel salt; the cocatalyst is aluminum alkyl.

6. The process according to claim 4, wherein: the molar ratio of the alkyl aluminum to the nickel salt is 2:1-6: 1.

7. The method of claim 1, wherein: the hydrogenation reaction ensures that the hydrogenation degree of unsaturated double bonds of diolefin in the copolymer is more than 95 percent, the hydrogenation degree of unsaturated bonds of aromatic hydrocarbon is less than 5 percent, and the residual quantity of the catalyst is less than 30 ppm.

8. A radial viscosity index copolymer for lubricating oils prepared by the process of any of claims 1 to 6, characterized in that: the structure of the hydrogenated precursor of the radial viscosity index copolymer is: (I/B-S)_n-C, wherein: I/B is an isoprene butadiene random copolymer, S is a styrene homopolymer, C is a polydivinylbenzene residue, n is the average arm number, and n is a natural number of 2-15; the total number average molecular weight of the star viscosity index improver is 5 multiplied by 10⁴-8×10⁵Arm number average molecular weight of 1X 10⁴-1×10⁵Is divided intoThe molecular weight distribution is 1-1.5.

9. A radial viscosity index copolymer for lubricating oil used in lubricating oils according to claim 7, wherein: the I/B block accounts for 75-95% of the total monomer mass, and the S block accounts for 5-25% of the total monomer mass in the hydrogenated precursor of the star viscosity index copolymer; wherein, the monomer I accounts for 50-70% of the I/B block, and the monomer B accounts for 30-50%; 1,2-B accounts for 5-80% of the mass of B in the I/B block, and 3,4-I accounts for 5-80% of the mass of I in the I/B block.

Technical Field

The invention relates to a viscosity index improver concentrated solution applied to lubricating oil, in particular to a viscosity index improver concentrated solution (concentrated solution of a star-shaped hydrogenated styrene (S) -isoprene (I) -butadiene (B) terpolymer viscosity index improver) prepared in situ in low-viscosity base oil and a preparation method thereof.

Background

By adopting a method of combining anion active polymerization and hydrogenation modification, the viscosity index improver with controllable structure, narrow molecular weight distribution and various topological structures can be prepared. The star hydrogenated SIBR type viscosity index improver is the most well-known, and the highest market share of the products is SV260 of RunYinji company. The polymer arm of the star viscosity index improver described in U.S. Pat. No.4116917 is a hydrogenated poly (butadiene/isoprene) tapered arm, and the preparation process thereof uses cyclohexane as a solvent, styrene, butadiene, and isoprene as monomers, n-butyllithium as an initiator, and divinylbenzene as a coupling agent to perform anionic polymerization and coupling, and after the termination reaction, nickel naphthenate as a main catalyst and triisobutylaluminum as a cocatalyst are used to perform hydrogenation modification on the star polymer to obtain a saturated star polymer, and the saturated star polymer is subjected to catalyst removal, solvent flash evaporation, gel liquid condensation, solvent recovery, and product drying to obtain the dry gel of the star viscosity index improver. The commercial products comprise two forms of dry glue and concentrated liquid. In the preparation method, the steps of solvent flash evaporation, glue solution condensation, solvent recovery, product drying, dry glue dissolving in base oil and the like are complicated to operate, the production period is prolonged, and the production cost is increased.

Disclosure of Invention

The invention aims to provide a viscosity index improver concentrated solution prepared in situ in low-viscosity base oil and a preparation method thereof.

In order to realize the purpose, the technical scheme is as follows:

a process for preparing the concentrated liquid of viscosity index improver from low-viscosity base oil includes such steps as polymerizing in low-viscosity base oil, hydrogenating, deashing and directly preparing the concentrated liquid of viscosity index improver.

In a further aspect of the present invention,

a: adding isoprene and butadiene into base oil, adding an alkyl lithium initiator, initiating polymerization at 20-90 ℃, and reacting to obtain an isoprene and butadiene random copolymer I/B when the conversion rate of the isoprene and the butadiene exceeds 95%; then adding styrene (S), and continuing to react at 20-90 ℃ until the conversion rate of the styrene exceeds 95 percent to obtain an I/B-S two-block polymer; wherein, when preparing I/B, the mass ratio of the total monomer to the 2cst base oil is 1:4-1: 19; the addition amount of alkyl lithium is 1X 10^-3-1×10^-2mol/100g total monomer, the mass ratio of I to B is 3:7-7:3, and the mass ratio of I/B to S is 98:2-90: 10;

in the steps, the distribution of monomers in an isoprene/butadiene copolymer I/B is controlled by adding a structure regulator, the random copolymer is obtained by adding the structure regulator, the adding amount is generally that the molar ratio of THF to Li is 10:1-50:1, and the structure regulator is tetrahydrofuran; at the same time, the gradual copolymer I/B can be obtained without adding a structure regulator.

B: after the I/B-S two-block polymer is obtained, adding a coupling agent into the system to react at the temperature of 20-90 ℃, and when the conversion rate of the coupling agent exceeds 95%, adding isopropanol into the system to terminate the coupling reaction to obtain a base adhesive, namely a star-shaped block copolymer (I/B-S)_n-C; wherein the molar ratio of the coupling agent to the alkyl lithium is 3:1-20: 1; the molar ratio of isopropanol to alkyllithium is 1: 1;

c: adding a hydrogenation catalyst into the base oil solution of the base adhesive, uniformly mixing, introducing hydrogenation, and carrying out hydrogenation reaction at the temperature of 40-90 ℃ and the hydrogen pressure of 1.0-6.0 MPa; after the hydrogenation reaction is finished, adding solid acid and hydrogen peroxide to separate out the hydrogenation catalyst in a solid form, and removing the catalyst waste residues on a high-speed centrifuge in a layering manner to obtain a concentrated solution of the viscosity index improver.

The base oil solvent is one or two of I type, II type, III type and IV type base oil with the viscosity of 1-5 cst.

The molecular formula of the alkyl lithium is RLi, R is a hydrocarbon group with 4-20 carbon atoms, and n-butyl lithium or sec-butyl lithium is preferred; the coupling agent is an epoxy compound or a diene compound; including epoxidized soybean oil, epoxidized linseed oil, Divinylbenzene (DVB), 1, 3-distyrylbenzene. The adding mode of the coupling agent is one-time addition, multiple addition or continuous addition.

The hydrogenation catalyst is a main catalyst and a cocatalyst; the main catalyst is nickel salt (such as nickel naphthenate and nickel octoate); the cocatalyst is alkyl aluminum (such as triisobutyl aluminum, triethyl aluminum and the like).

The molar ratio of the alkyl aluminum to the nickel salt is 2:1-6: 1.

The hydrogenation of the polymer may be carried out by any suitable hydrogenation process, the hydrogenation catalyst comprising a non-noble metal or non-noble metal-containing compound of group VIII of the periodic Table (i.e. iron, cobalt and especially nickel). Specifically, triisobutyl aluminum and nickel naphthenate are mixed, and are added into a reaction system as a hydrogenation catalyst after being aged, wherein the nickel is 0.2-10mg per gram of dry glue according to the nickel; the dosage of triisobutyl aluminum: the molar ratio of triisobutylaluminum to nickel naphthenate is 2:1-8: 1.

The hydrogenation reaction ensures that the hydrogenation degree of unsaturated double bonds of diolefin in the copolymer is more than 95 percent, the hydrogenation degree of unsaturated bonds of aromatic hydrocarbon is less than 5 percent, and the residual quantity of the catalyst is less than 30 ppm.

One such method produces a star viscosity index copolymer for lubricating oils, the hydrogenated precursor of the star viscosity index copolymer having the structure: (I/B-S)_n-C, wherein: I/B is an isoprene butadiene random copolymer, S is a styrene homopolymer, C is a polydivinylbenzene residue, n is the average arm number, and n is a natural number of 2-15; the total number average molecular weight of the star viscosity index improver is 5 multiplied by 10⁴-8×10⁵Arm number average molecular weight of 1X 10⁴-1×10⁵The molecular weight distribution is 1-1.5.

The I/B block accounts for 75-95% of the total monomer mass, and the S block accounts for 5-25% of the total monomer mass in the hydrogenated precursor of the star viscosity index copolymer; wherein, the monomer I accounts for 50-70% of the I/B block, and the monomer B accounts for 30-50%; 1,2-B accounts for 5-80% of the mass of B in the I/B block, and 3,4-I accounts for 5-80% of the mass of I in the I/B block.

The invention has the following advantages:

the viscosity index improver prepared in situ is prepared by the method that isoprene and butadiene exist in a polymer segment in a random copolymerization mode so as to reduce the long chain content of hydrogenated polyethylene and improve the low-temperature performance; the styrene exists in a homopolymerization mode at a position close to the nucleus, and the polystyrene exists in a short chain segment mode, so that the coupling efficiency is improved, and the rigidity of the polymer is not obviously improved. The obtained viscosity index improver has controllable molecular weight and microstructure, narrow molecular weight distribution, super-strong tackifying capability, excellent shear stability, extremely high viscosity index and excellent oxidation resistance, and can meet the requirements of different occasions on the performance of the viscosity index improver. The star-shaped hydrogenated SIBR viscosity index improver is polymerized, coupled and hydrogenated and modified in base oil, and a hydrogenation catalyst is removed by a dry method. The process omits the steps of solvent flash evaporation, glue solution condensation, solvent recovery, product drying, dry glue dissolving in base oil and the like, and has the advantages of simple process, convenient production, effective improvement of efficiency and cost reduction.

Drawings

FIG. 1 shows a dry glue according to example 1 of the present invention¹³C NMR spectrum.

Detailed Description

The present invention will be further explained with reference to examples. The solvent used in the examples was a group II hydrogenated base oil having a medium sea oil viscosity of 2 cst.

Example 1

In a 500mL glass reaction flask with electromagnetic stirring, 180g of a base oil having a viscosity of 2cst, 12g of isoprene (Ip), 6g of butadiene (Bd), and 0.7mL of Tetrahydrofuran (THF) as a structure modifier were charged, the temperature was raised to 70 ℃, and n-butyllithium (n-BuLi) as an initiator was added to polymerize, wherein the amount of Li added was 1.43X 10^-3mol/100g, when the monomer conversion rate of Ip and Bd exceeds 95 percent after the polymerization reaction is carried out for 90 minutes, obtaining a random copolymer block I/B; then adding 2g of styrene (St) monomer, and continuing to react for 90 minutes at the same temperature (70 ℃) until the conversion rate of the St monomer exceeds 95% to obtain a homopolymer block PS; then, divinyl benzene (DVB) is added for coupling reaction at 50 ℃, wherein the molar ratio of DVB to Li is 6:1, and the reaction is carried out for 120 minutes; isopropanol was added to terminate the coupling reaction (molar ratio of isopropanol to alkyllithium 1:1) to give star isoprene/butadiene-styrene terpolymer (I/B-S)_n-C, wherein I/B is a random copolymer, S is a homopolymer, and the number average molecular weight of the I/B block is 6.3X 10⁴The number average molecular weight of the S block is 0.7X 10⁴The number average molecular weight of the polymer arm I/B-S was 7.0X 10⁴The average arm number was 7.0 arms.

Adding a hydrogenation catalyst into the obtained star polymer solution to be hydrogenated, uniformly stirring, introducing hydrogen to carry out hydrogenation reaction, wherein a main catalyst of the hydrogenation catalyst is nickel naphthenate, a cocatalyst is triisobutylaluminum, the molar ratio of the cocatalyst counted by aluminum to the main catalyst counted by nickel is 4:1, the dosage of the hydrogenation catalyst is 2mg of nickel/100 g of dry glue, the reaction temperature is 60 ℃, the reaction pressure is 3MPa, the reaction time is 2 hours, obtaining hydrogenated star polymer, adding solid sebacic acid, stirring, forming a precipitate with the catalyst, separating for 30 minutes by a high-speed centrifuge with the rotation speed of 10000rpm, removing the solid precipitate to enable the solid precipitate to reach the impurity removal standard, and obtaining the viscosity index improver concentrated solution. The hydrogenation reaction conditions enable the hydrogenation degree of Ip and Bd units in the star hydrogenated polymer to be more than 98 percent, and the hydrogenation degree of St units to be less than 2 percent.

Further, it was confirmed that the copolymer block I/B in the concentrated solution of the above example was a random block, and after dry gel was extracted from the mixture by a Soxhlet extractor, the gel was subjected to¹³C NMR detection is carried out, and sequence distribution of a unitary structure, a binary structure and a ternary structure is calculated (see figure 1), wherein the sequence distribution is formed by hydrogenation of an I unit in figure 1 into an ethylene (e) unit and a propylene (p) unit, and the sequence distribution is formed by hydrogenation of a B unit into an ethylene (e) unit and a butylene (B) unit. According to nuclear magnetic carbon spectrum¹³C NMR calculation gives a unary ratio of e: p 62:38, binary ratio ee: ep: pp 23:77:0, ternary ratio eee: eep: pep: epe: ppe: ppp-17: 18:30:35:0: 0. The distribution of the e and p microstructures can be used to conclude that the I and B monomer units are randomly distributed after polymerization.

Example 2

The difference from the embodiment 1 is that:

adding 450g of base oil with the viscosity of 2cst, 32gIp, 13gBd and 0.4mL of THF into a 1000mL glass reaction bottle with electromagnetic stirring, heating to 90 ℃, adding an initiator n-BuLi for polymerization, wherein the adding amount of the n-BuLi is 0.72X 10^-3mol/100g, when the monomer conversion rate of Ip and Bd exceeds 95 percent after the polymerization reaction is carried out for 90 minutes, obtaining a random copolymer block I/B; then adding 2g St monomer, and continuing to react for 90 minutes at the same temperature (90 ℃) until the conversion rate of the St monomer exceeds 95 percent to obtain homopolymer block PS; then, divinyl benzene (DVB) is added for coupling reaction at 50 ℃, wherein the molar ratio of DVB to Li is 6:1, and the reaction is carried out for 120 minutes; isopropanol was added to terminate the coupling reaction (molar ratio of isopropanol to alkyllithium 1:1) to give star isoprene/butadiene-styrene terpolymer (I/B-S)_n-C, wherein I/B is a random copolymer, S is a homopolymer, and the number average molecular weight of the I/B block is 12.6X 10⁴Number average of S blocksThe quantum is 1.4X 10⁴The number average molecular weight of the polymer arm I/B-S was 14.0X 10⁴The average arm number was 5.3 arms. In this example, the same hydrogenation method as in example 1 was used to obtain a saturated star polymer concentrate, i.e., a star viscosity index improver concentrate.

Example 3

Adding 180g of base oil with the viscosity of 2cst, 12gIp, 6gBd and 0.7mL of THF into a 500mL glass reaction bottle with electromagnetic stirring, heating to 90 ℃, adding an initiator n-BuLi for polymerization, wherein the adding amount of the n-BuLi is 1.43X 10^-3mol/100g, when the monomer conversion rate of Ip and Bd exceeds 95 percent after the polymerization reaction is carried out for 70 minutes, obtaining a random copolymer block I/B; then adding 2g St monomer, and continuing to react for 90 minutes at the same temperature (90 ℃) until the conversion rate of the St monomer exceeds 95 percent to obtain homopolymer block PS; then Divinylbenzene (DVB) is added for coupling reaction at the temperature of 50 ℃, wherein the molar ratio of DVB to Li is 8:1, and the reaction is carried out for 120 minutes; isopropanol was added to terminate the coupling reaction (molar ratio of isopropanol to alkyllithium 1:1) to give star isoprene/butadiene-styrene terpolymer (I/B-S)_n-C, wherein I/B is a random copolymer, S is a homopolymer, and the number average molecular weight of the I/B block is 6.2X 10⁴The number average molecular weight of the S block is 0.9X 10⁴The number average molecular weight of the polymer arm I/B-S was 7.1X 10⁴The average arm number was 8.1 arms. In this example, the same hydrogenation method as in example 1 was used to obtain a saturated star polymer concentrate, i.e., a star viscosity index improver concentrate.

Example 4

Adding 450g of base oil with the viscosity of 2cst, 28gIp, 17gBd and 0.7mL of THF into a 1000mL glass reaction bottle with electromagnetic stirring, heating to 50 ℃, adding an initiator n-BuLi for polymerization, wherein the adding amount of the n-BuLi is 1.43X 10^-3mol/100g, when the monomer conversion rate of Ip and Bd exceeds 95 percent after the polymerization reaction is carried out for 90 minutes, obtaining a random copolymer block I/B; then adding 2g St monomer, and continuing to react for 90 minutes at the same temperature (50 ℃) until the conversion rate of the St monomer exceeds 95 percent to obtain homopolymer block PS; adding divinyl at 50 deg.CCarrying out coupling reaction on phenyl (DVB), wherein the molar ratio of DVB to Li is 10:1, and reacting for 120 minutes; isopropanol was added to terminate the coupling reaction (molar ratio of isopropanol to alkyllithium 1:1) to give star isoprene/butadiene-styrene terpolymer (I/B-S)_n-C, wherein I/B is a random copolymer, S is a homopolymer, and the number average molecular weight of the I/B block is 6.1X 10⁴The number average molecular weight of the S block is 0.8X 10⁴The number average molecular weight of the polymer arm I/B-S was 6.9X 10⁴The average arm number was 8.7 arms. In this example, the same hydrogenation method as in example 1 was used to obtain a saturated star polymer concentrate, i.e., a star viscosity index improver concentrate.

Example 5

Adding 450g of base oil with the viscosity of 2cst, 28gIp, 17gBd and 0.7mL of THF into a 1000mL glass reaction bottle with electromagnetic stirring, heating to 50 ℃, adding an initiator n-BuLi for polymerization, wherein the adding amount of the n-BuLi is 1.43X 10^-3mol/100g, when the monomer conversion rate of Ip and Bd exceeds 95 percent after the polymerization reaction is carried out for 90 minutes, obtaining a random copolymer block I/B; then adding 2g St monomer, and continuing to react for 90 minutes at the same temperature (50 ℃) until the conversion rate of the St monomer exceeds 95 percent to obtain homopolymer block PS; then Divinylbenzene (DVB) is added for coupling reaction at the temperature of 50 ℃, wherein the molar ratio of DVB to Li is 12:1, and the reaction is carried out for 120 minutes; isopropanol was added to terminate the coupling reaction (molar ratio of isopropanol to alkyllithium 1:1) to give star isoprene/butadiene-styrene terpolymer (I/B-S)_n-C, wherein I/B is a random copolymer, S is a homopolymer, and the number average molecular weight of the I/B block is 6.2X 10⁴The number average molecular weight of the S block is 0.7X 10⁴The number average molecular weight of the polymer arm I/B-S was 6.9X 10⁴The average arm number was 9.1 arms. In this example, the same hydrogenation method as in example 1 was used to obtain a saturated star polymer concentrate, i.e., a star viscosity index improver concentrate.

The application properties of the products obtained in the above examples were determined:

the aluminum-nickel residue in the product obtained in the above examples 1-5, the concentrated solution SV261 of the wet-in-package adhesive agent (comparative example 1) was tested by using the Chinese environmental protection standard HJ 700-2014. The tackifying power, viscosity index increment, shear stability and low temperature dynamic viscosity of the above examples 1-5 and comparative example 1 after addition of 150N base oil were tested using the industry standard SH/T0622-2007. The measurement is to measure the kinematic viscosity and viscosity index of an oil sample at 100 ℃ according to GB/T265 'petroleum product kinematic viscosity measurement method and dynamic viscometer algorithm'; a shear stability test is carried out by adopting an SH/T0103-2007 method for measuring shear stability of polymer-containing oil by a diesel nozzle method, the main method is that the polymer-containing oil can cause the degradation of polymer molecules when passing through a diesel nozzle at a certain shear rate, the degradation can cause the reduction of the kinematic viscosity of a sample, the mechanical shear stability of the polymer-containing oil is expressed by viscosity loss percentage, and the smaller the viscosity change rate of the polymer-containing oil before and after the diesel nozzle is sheared is, the better the shear stability of the viscosity index improver is. The viscosity at 100 ℃ is higher, so that the viscosity index improver has better tackifying effect; apparent viscosity (CCS) of lubricating oils at low temperatures (-20 ℃) was measured using a cold start simulator according to GB/T6538 "Engine oil apparent viscometry", the lower the CCS value, the better the low temperature stability of the viscosity index improver. The application performance ratios thereof are shown in table 1.

TABLE 1 application Properties of examples 1 to 5 and comparative example 1

In Table 1, the products of examples 1-5 are superior to comparative example 1 in both thickening ability and viscosity index increment; the shear stability and low temperature dynamic viscosity of examples 1 and 3-5 are also significantly better than those of comparative example 1; example 2 is superior to comparative example 1 in that the arm molecular weight is large, and the thickening ability is superior, but the shear stability and low-temperature dynamic viscosity are slightly lower than those of comparative example 1. In general, the star-shaped hydrogenated SIBR adhesive concentrated solution obtained by the invention has increased tackifying capability and viscosity index increment and reduced shear stability along with the increase of molecular weight, and compared with comparative example 1, the star-shaped hydrogenated SIBR adhesive concentrated solution has excellent comprehensive application performance, simple and feasible preparation process and effectively reduced production cost.

The hydrogenated SIBR base oil solution is a lubricating oil viscosity index improver concentrated solution with excellent performance, has excellent thickening capacity, shear stability and low-temperature performance, and can meet the performance requirements of lubricating oil on polymers in different occasions. The preparation method is simple, the operation is convenient, the yield is high, the polymer structure and the molecular weight are controllable, and the molecular weight distribution is narrow.