阅读说明：本技术 茂金属催化剂及其应用 (Metallocene catalyst and application thereof ) 是由 胡泓梵 周生远 李新乐 孙鑫 周逸 李华姝 张雪芹 辛世煊 于 2021-07-07 设计创作，主要内容包括：本发明公开了一种茂金属催化剂及其应用,该茂金属催化剂具有如下式I结构：其中,M为Ti、Zr或Hf；R-(1)为芳基或1-6个碳的烷基；X-(1)、X-(2)和X-(3)各自独立为与M形成σ-键的配体。采用本发明茂金属催化剂得到的mPAO具有相对较高的粘度指数,且通过改变温度,或不同链转移剂的使用,可大幅度调节mPAO的运动粘度。(The invention discloses a metallocene catalyst and application thereof, wherein the metallocene catalyst has a structure shown as the following formula I: wherein M is Ti, Zr or Hf; r 1 Is aryl or alkyl of 1 to 6 carbons; x 1 、X 2 And X 3 Each independently a ligand forming a sigma-bond with M. The mPAO obtained by the metallocene catalyst of the invention has relatively high valueAnd the kinematic viscosity of mPAO can be adjusted substantially by varying the temperature, or the use of different chain transfer agents.)

1. A metallocene catalyst, wherein the metallocene catalyst has the structure of formula I:

wherein M is Ti, Zr or Hf; r₁Is aryl or alkyl of 1 to 6 carbons; x₁、X₂And X₃Each independently a ligand forming a sigma-bond with M.

2. The metallocene catalyst of claim 1, wherein X is₁、X₂And X₃Each independently selected from a halogen atom or an alkyl group having 1 to 6 carbons.

3. The metallocene catalyst of claim 2, wherein X is₁、X₂And X₃Each independently selected from the group consisting of a chlorine atom, a bromine atom, an iodine atom, a fluorine atom, a methyl group, an ethyl group, a propyl group, a n-butyl group and an isobutyl group; the R is₁Is phenyl or phenyl with a substituentMethyl, ethyl, propyl or isopropyl.

4. The metallocene catalyst according to claim 3, characterized in that it is:

complex 1: 5-phenyl-5, 10-dihydroindeno [1, 2-b ] indole zirconium trichloride;

complex 2: 5-phenyl-5, 10-dihydroindeno [1, 2-b ] indolitrimethylzirconium;

complex 3: 5-phenyl-5, 10-dihydroindeno [1, 2-b ] indole hafnium trichloride;

complex 4: 5-phenyl-5, 10-dihydroindeno [1, 2-b ] indolium trimethylhafnium;

complex 5: 5-phenyl-5, 10-dihydroindeno [1, 2-b ] indoletitanium trichloride;

complex 6: 5-phenyl-5, 10-dihydroindeno [1, 2-b ] indolitrimethyl titanium;

complex 7: 5-phenyl-5, 10-dihydroindeno [2, 1-b ] indole zirconium trichloride;

complex 8: 5-phenyl-5, 10-dihydroindeno [2, 1-b ] indolitrimethylzirconium;

complex 9: 5-phenyl-5, 10-dihydroindeno [2, 1-b ] indole hafnium trichloride;

complex 10: 5-phenyl-5, 10-dihydroindeno [2, 1-b ] indolium trimethylhafnium;

complex 11: 5-phenyl-5, 10-dihydroindeno [2, 1-b ] indoletitanium trichloride; or

Complex 12: 5-phenyl-5, 10-dihydroindeno [2, 1-b ] indoletrimethyltitanium.

5. A method for synthesizing metallocene poly-alpha-olefin, characterized in that alpha-olefin is used as raw material, the metallocene catalyst of any one of claims 1-4 is used as main catalyst, and polymerization reaction is carried out.

6. The method of synthesizing metallocene polyalphaolefin of claim 5 wherein the alpha olefin is a single or mixed alpha olefin; the synthesis method also adds a cocatalyst and a chain transfer agent.

7. The method of claim 6, wherein the cocatalyst is an alkylaluminoxane reagent or an organoboron reagent; the chain transfer agent comprises an aluminum agent or an alkyl zinc agent, and the aluminum agent is of the formula AlX₃Alkyl aluminum of formula HAlX₂Of the formula AlX₂Alkylaluminum chloride of Cl and X is an alkyl group.

8. The method for synthesizing metallocene poly alpha-olefin according to claim 7, wherein the alkylaluminoxane reagent is selected from one or more of methylaluminoxane, ethylaluminoxane, n-propylaluminoxane and n-butylaluminoxane; the organoboron reagent is selected from [ Ph₃C][B(C₆F₅)₄]、[PhMe₂NH][B(C₆F₅)₄]、B(C₆F₅)₃One or more of them.

9. The method for synthesizing metallocene polyalphaolefin according to claim 7, wherein the alkylaluminum is one or more selected from trimethylaluminum, triethylaluminum, tri-n-propylaluminum, triisobutylaluminum, trihexylaluminum, tri-n-butylaluminum, triisopropylaluminum, tricyclohexylaluminum, trioctylaluminum, triphenylaluminum, tri-p-tolylaluminum, tribenzylaluminum, ethyldibenzylaluminum, ethyldi-p-tolylaluminum, and diethylbenzylaluminum;

the alkyl aluminum hydride is selected from one or more of dimethyl aluminum hydride, diethyl aluminum hydride, di-n-propyl aluminum hydride, diisobutyl aluminum hydride, dihexyl aluminum hydride, di-n-butyl aluminum hydride, diisopropyl aluminum hydride, dicyclohexyl aluminum hydride, dioctyl aluminum hydride, diphenyl aluminum hydride, di-p-tolyl aluminum hydride, dibenzyl aluminum hydride, ethyl benzyl aluminum hydride, ethyl p-tolyl aluminum hydride and ethyl benzyl aluminum hydride;

the alkyl aluminum chloride is selected from one or more of dimethyl aluminum chloride, diethyl aluminum chloride, di-n-propyl aluminum chloride, diisopropyl aluminum chloride, di-n-butyl aluminum chloride, diisobutyl aluminum chloride, dipentyl aluminum chloride, dihexyl aluminum chloride, dicyclohexyl aluminum chloride, dioctyl aluminum chloride, diphenyl aluminum chloride, di-p-tolyl aluminum chloride, dibenzyl aluminum chloride, ethyl benzyl aluminum chloride and ethyl p-tolyl aluminum chloride;

the alkyl zinc reagent is selected from one or more of dimethyl zinc, diethyl zinc and diisopropyl zinc.

10. The method of claim 6, wherein the molar ratio of aluminum in the cocatalyst to the metal in the procatalyst is 10-5000: 1; or the molar ratio of the boron in the cocatalyst to the metal in the main catalyst is 1-200: 1; the alpha-olefin is selected from one or a mixture of more of 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1-tridecene, 1-tetradecene and 1-hexadecene.

11. The method of claim 6, wherein the molar ratio of aluminum in the chain transfer agent to the metal in the procatalyst is 1-500: 1; or the molar ratio of the zinc in the chain transfer agent to the metal in the main catalyst is 1-500: 1; the polymerization reaction is carried out in the presence of inert gas, the temperature of the polymerization reaction is 20-150 ℃, and the time of the polymerization reaction is 1-12 hours.

12. A metallocene polyalphaolefin obtainable by the synthesis process of any one of claims 5 to 11.

Technical Field

The invention relates to the technical field of preparation of poly-alpha-olefin synthetic oil by alpha-olefin polymerization, in particular to a synthesis method of metallocene poly-alpha-olefin and a metallocene catalyst used in the method.

Background

Poly Alpha Olefin (PAO) is one kind of synthetic base oil, is a synthetic hydrocarbon lubricating oil prepared by a chemical synthesis method, has relatively regular long-chain alkane as a composition, is a synthetic lubricating oil base oil with excellent performance, and is one of the most widely applied base oil stocks in the current synthetic engine oil, gear oil and other industrial oil and grease. The synthetic oil prepared by the method greatly expands the application range of the lubricating grease under low temperature, high load and other harsh conditions, and provides excellent viscosity-temperature performance, thermal oxidation stability, lubricating and wear-resisting properties and detergency, thereby greatly prolonging the oil change period, slowing down the corrosion and wear of equipment, reducing the maintenance period of the equipment, and improving the utilization rate and service life of the equipment.

Polyalphaolefins are typically produced by olefin catalytic polymerization techniques using monomeric or mixed olefins in the alpha-olefin range from C8 to C12 and the polymerization catalyst is a Lewis acid type catalyst or a Ziegler-Natta catalyst. The use performance of the base oil is improved by improving the polymerization process and the polymerization catalyst. Over the years, there has been a great improvement and advancement in the technology of poly-alpha-olefin production.

To distinguish from conventional PAOs, the polyalphaolefins synthesized using metallocene catalysts are referred to as metallocene polyalphaolefins, i.e., mpao (metallocene PAO). In general, PAO molecules possess an overhanging backbone from which side chains of varying lengths extend in a disordered manner. The mPAO adopts a metallocene catalyst synthesis process, metallocene is a single-active-center catalyst, and a very uniform chemical product can be obtained by the unique geometric structure of the catalyst, so that the mPAO has a comb-shaped structure and does not have an upright side chain. This shape possesses improved rheological and flow characteristics compared to conventional PAOs, and thus may better provide shear stability, lower pour point and higher viscosity index, particularly with much higher shear stability than conventional PAOs due to fewer side chains. These characteristics dictate that mpaos are targeted for high severity applications, including powertrain and gear oils, compressor lubricants, transmission fluids, and industrial lubricants.

The metallocene catalytic synthesis process has the following characteristics: firstly, metallocene catalyzed alpha-olefin polymerization has very high catalytic activity which can be as high as dozens or even hundreds of kilograms of PAO per gram of catalyst, so the amount of the catalyst and cocatalyst consumed in the synthesis process is very small; secondly, because the metallocene catalyst is a single-active-center catalyst, the single-active-center polyolefin catalyst can well control the microstructure of the synthesized polyolefin molecules, namely the catalytic polymerization degree can be effectively adjusted along with the change of the process, and the catalyst has great elasticity, so that the chemical structure, the molecular weight and the molecular weight distribution of the polyolefin molecules can be accurately controlled, the PAO product with the required viscosity grade can be directly produced according to the actual requirement by utilizing the characteristic, and the production process flow is simplified; moreover, the catalytic system has high catalytic activity, so the reaction period is only about 2 hours, the production period is greatly shortened, and the production efficiency is improved; finally, because the used catalyst and cocatalyst are small in amount, the post-treatment process is simple, and the emission of three wastes can be effectively reduced.

Chinese patent publication No. CN1549852 discloses a process for the preparation of one or more olefin oligomers in the presence of a single site catalyst. Preferably, the olefin is an alpha-olefin and the oligomer is a Polyalphaolefin (PAO). The PAO so produced is completely or substantially free of tertiary hydrogen due to isomerization. Thus, the PAO has improved biodegradability, improved oxidation resistance, and/or a relatively higher viscosity index. The PAO has many useful applications such as being a lubricant component.

The lubricating oil composition of the invention of Chinese patent with publication number CN101617033 contains 1-5 mm kinematic viscosity at 100 DEG C²A lubricating base oil and a kinematic viscosity at 100 ℃ of 20 to 2000mm²At least 1/s selected from the group consisting of Olefin Copolymers (OCP) and Polyalphaolefins (PAO), having a kinematic viscosity at 100 ℃ of 8.0mm²(ii) less than s and a viscosity index of 155 or more.

U.S. patent 6548723 discloses a method for preparing lube base oil PAO by oligomerization of 1-decene and ethylene under catalysis of metallocene or organic metal amine salt, wherein the catalyst is mainly non-bridged cyclopentadienyl metallocene, and the obtained PAO is low-viscosity base oil when Al/Zr is 1000.

U.S. Pat. No. 4,6706828 uses meso-silicon bridged bis-indenyl substituted bridged metallocene catalyst to synthesize PAO in the presence of hydrogen and uses 1-decene as raw material, the catalytic performance of different meso and rac structures is different, and the viscosity-temperature performance of the catalyst system and the obtained PAO product is greatly influenced by changing the configuration ratio and hydrogen pressure of the catalyst.

The Chinese patent publication No. CN105062555 discloses that mPAO with excellent viscosity-temperature performance is synthesized by taking coal-made alpha-olefin produced by a Fischer-Tropsch synthesis process as a polymerization raw material under the action of a metallocene catalyst; the method replaces the expensive pure alpha-olefin polymerization raw material, reduces the production cost of PAO on one hand, and improves the economy of the Fischer-Tropsch synthesis process on the other hand.

Most of the above patents mention that 1-decene or 1-octene obtained by ethylene oligomerization is used as raw material to polymerize mPAO, and also mention that mPAO is synthesized by using coal-made alpha-olefin as raw material, which has certain requirements on the synthetic raw material and limits the application thereof.

Disclosure of Invention

The invention mainly aims to provide a metallocene catalyst and application thereof, so as to overcome the defects that the metallocene catalyst in the prior art has requirements on raw materials and the obtained poly-alpha-olefin has low viscosity-temperature index.

In order to achieve the above object, the present invention provides a metallocene catalyst having the following structure of formula I:

wherein M is Ti, Zr or Hf; r₁Is aryl or alkyl of 1 to 6 carbons; x₁、X₂And X₃Each independently a ligand forming a sigma-bond with M.

The metallocene catalyst of the present invention, wherein X is₁、X₂And X₃Each independently selected from a halogen atom or an alkyl group having 1 to 6 carbons.

The metallocene catalyst of the present invention, wherein X is₁、X₂And X₃Each independently selected from the group consisting of a chlorine atom, a bromine atom, an iodine atom, a fluorine atom, a methyl group, an ethyl group, a propyl group, a n-butyl group and an isobutyl group; the R is₁Is phenyl or phenyl with substituent, and the substituent is methyl, ethyl, propyl or isopropyl.

The metallocene catalyst of the invention is characterized in that:

complex 1: 5-phenyl-5, 10-dihydroindeno [1, 2-b ] indole zirconium trichloride;

complex 2: 5-phenyl-5, 10-dihydroindeno [1, 2-b ] indolitrimethylzirconium;

complex 3: 5-phenyl-5, 10-dihydroindeno [1, 2-b ] indole hafnium trichloride;

complex 4: 5-phenyl-5, 10-dihydroindeno [1, 2-b ] indolium trimethylhafnium;

complex 5: 5-phenyl-5, 10-dihydroindeno [1, 2-b ] indoletitanium trichloride;

complex 6: 5-phenyl-5, 10-dihydroindeno [1, 2-b ] indolitrimethyl titanium;

complex 7: 5-phenyl-5, 10-dihydroindeno [2, 1-b ] indole zirconium trichloride;

complex 8: 5-phenyl-5, 10-dihydroindeno [2, 1-b ] indolitrimethylzirconium;

complex 9: 5-phenyl-5, 10-dihydroindeno [2, 1-b ] indole hafnium trichloride;

complex 10: 5-phenyl-5, 10-dihydroindeno [2, 1-b ] indolium trimethylhafnium;

complex 11: 5-phenyl-5, 10-dihydroindeno [2, 1-b ] indoletitanium trichloride; or

Complex 12: 5-phenyl-5, 10-dihydroindeno [2, 1-b ] indoletrimethyltitanium.

In order to achieve the above object, the present invention also provides a method for synthesizing metallocene poly-alpha-olefin, which comprises carrying out polymerization reaction by using alpha-olefin as raw material and the above metallocene catalyst as main catalyst.

The invention relates to a method for synthesizing metallocene poly alpha-olefin, wherein the alpha-olefin is single or mixed alpha-olefin; the synthesis method also adds a cocatalyst and a chain transfer agent.

The invention relates to a method for synthesizing metallocene poly alpha-olefin, wherein, the cocatalyst is alkyl aluminoxane reagent or organic boron reagent; the chain transfer agent comprises an aluminum agent or an alkyl zinc agent, and the aluminum agent is of the formula AlX₃Alkyl aluminum of formula HAlX₂Of the formula AlX₂Alkylaluminum chloride of Cl and X is an alkyl group.

The invention relates to a method for synthesizing metallocene poly-alpha-olefin, wherein, the alkyl aluminoxane reagent is selected from one or more of methyl aluminoxane, ethyl aluminoxane, n-propyl aluminoxane and n-butyl aluminoxane; the organoboron reagent is selected from [ Ph₃C][B(C₆F₅)₄]、[PhMe₂NH][B(C₆F₅)₄]、B(C₆F₅)₃One or more of the above;

the invention relates to a method for synthesizing metallocene poly-alpha-olefin, wherein the alkyl aluminum is selected from one or more of trimethyl aluminum, triethyl aluminum, tri-n-propyl aluminum, triisobutyl aluminum, trihexyl aluminum, tri-n-butyl aluminum, triisopropyl aluminum, tricyclohexyl aluminum, trioctyl aluminum, triphenyl aluminum, tri-p-tolyl aluminum, tribenzyl aluminum, ethyl dibenzyl aluminum, ethyl di-p-tolyl aluminum and diethyl benzyl aluminum;

the alkyl aluminum hydride is selected from one or more of dimethyl aluminum hydride, diethyl aluminum hydride, di-n-propyl aluminum hydride, diisobutyl aluminum hydride, dihexyl aluminum hydride, di-n-butyl aluminum hydride, diisopropyl aluminum hydride, dicyclohexyl aluminum hydride, dioctyl aluminum hydride, diphenyl aluminum hydride, di-p-tolyl aluminum hydride, dibenzyl aluminum hydride, ethyl benzyl aluminum hydride, ethyl p-tolyl aluminum hydride and ethyl benzyl aluminum hydride;

the alkyl aluminum chloride is selected from one or more of dimethyl aluminum chloride, diethyl aluminum chloride, di-n-propyl aluminum chloride, diisopropyl aluminum chloride, di-n-butyl aluminum chloride, diisobutyl aluminum chloride, dipentyl aluminum chloride, dihexyl aluminum chloride, dicyclohexyl aluminum chloride, dioctyl aluminum chloride, diphenyl aluminum chloride, di-p-tolyl aluminum chloride, dibenzyl aluminum chloride, ethyl benzyl aluminum chloride and ethyl p-tolyl aluminum chloride;

the alkyl zinc reagent is selected from one or more of dimethyl zinc, diethyl zinc and diisopropyl zinc.

The invention relates to a method for synthesizing metallocene poly alpha-olefin, wherein the molar ratio of aluminum in a cocatalyst to metal in a main catalyst is 10-5000: 1; or the molar ratio of the boron in the cocatalyst to the metal in the main catalyst is 1-200: 1; the alpha-olefin is selected from one or a mixture of more of 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1-tridecene, 1-tetradecene and 1-hexadecene.

The invention relates to a method for synthesizing metallocene poly alpha-olefin, wherein the molar ratio of aluminum in a chain transfer agent to metal in a main catalyst is 1-500: 1; or the molar ratio of the zinc in the chain transfer agent to the metal in the main catalyst is 1-500: 1; the polymerization reaction is carried out in the presence of inert gas, the temperature of the polymerization reaction is 20-150 ℃, and the time of the polymerization reaction is 1-12 hours.

In order to achieve the above objects, the present invention also provides a metallocene polyalphaolefin obtained by the above synthesis method.

The invention has the beneficial effects that:

the metallocene catalyst of the invention not only can polymerize single long-chain alpha-olefin, but also can catalyze and polymerize mixed long-chain alpha-olefin, and the metallocene poly alpha-olefin polymerized by the metallocene catalyst of the invention has excellent viscosity-temperature performance and high viscosity index, and the kinematic viscosity of mPAO can be greatly adjusted by changing the temperature or using different chain transfer agents.

Detailed Description

The following examples of the present invention are described in detail, and the present invention is carried out on the premise of the technical scheme of the present invention, and detailed embodiments and procedures are given, but the scope of the present invention is not limited to the following examples, and the following examples are experimental methods without specific conditions noted, and generally follow conventional conditions.

The invention provides a metallocene catalyst, which has a structure shown in the following formula I:

wherein M is Ti, Zr or Hf; r₁Is aryl or alkyl of 1 to 6 carbons; x₁、X₂And X₃Each independently a ligand forming a sigma-bond with M.

In one embodiment, X₁、X₂And X₃Each independently selected from a halogen atom or an alkyl group having 1 to 6 carbons; in another embodiment, X₁、X₂And X₃Each independently selected from the group consisting of a chlorine atom, a bromine atom, an iodine atom, a fluorine atom, a methyl group, an ethyl group, a propyl group, a n-butyl group and an isobutyl group.

In one embodiment, R₁Is phenyl or phenyl with substituent, and the substituent is methyl, ethyl, propyl or isopropyl.

In one embodiment, the metallocene catalyst of the present invention is:

complex 1: 5-phenyl-5, 10-dihydroindeno [1, 2-b ] indole zirconium trichloride;

complex 2: 5-phenyl-5, 10-dihydroindeno [1, 2-b ] indolitrimethylzirconium;

complex 3: 5-phenyl-5, 10-dihydroindeno [1, 2-b ] indole hafnium trichloride;

complex 4: 5-phenyl-5, 10-dihydroindeno [1, 2-b ] indolium trimethylhafnium;

complex 5: 5-phenyl-5, 10-dihydroindeno [1, 2-b ] indoletitanium trichloride;

complex 6: 5-phenyl-5, 10-dihydroindeno [1, 2-b ] indolitrimethyl titanium;

complex 7: 5-phenyl-5, 10-dihydroindeno [2, 1-b ] indole zirconium trichloride;

complex 8: 5-phenyl-5, 10-dihydroindeno [2, 1-b ] indolitrimethylzirconium;

complex 9: 5-phenyl-5, 10-dihydroindeno [2, 1-b ] indole hafnium trichloride;

complex 10: 5-phenyl-5, 10-dihydroindeno [2, 1-b ] indolium trimethylhafnium;

complex 11: 5-phenyl-5, 10-dihydroindeno [2, 1-b ] indoletitanium trichloride; or

Complex 12: 5-phenyl-5, 10-dihydroindeno [2, 1-b ] indoletrimethyltitanium.

The invention also provides a method for synthesizing metallocene poly-alpha-olefin, which takes alpha-olefin as raw material and takes the metallocene catalyst as main catalyst to carry out polymerization reaction.

The metallocene catalyst of the invention not only can polymerize single long chain alpha-olefin, but also can catalyze and polymerize mixed long chain alpha-olefin, and the metallocene poly alpha-olefin polymerized by the metallocene catalyst of the invention has the characteristics of excellent viscosity-temperature performance, high viscosity index and adjustable kinematic viscosity.

In one embodiment, the alpha-olefins of the present invention are single or mixed alpha-olefins; in another embodiment, the alpha-olefin of the present invention is selected from the group consisting of 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1-tridecene, 1-tetradecene, and 1-hexadecene, in any combination thereof.

In one embodiment, the polymerization reaction of the present invention is carried out in the presence of an inert gas at a temperature of 20 ℃ to 150 ℃ for a period of 1 hour to 12 hours. The present invention is not particularly limited to the kind of inert gas, and nitrogen gas, argon gas, or the like may be used.

In one embodiment, a co-catalyst and a chain transfer agent are also added to the synthesis process of the present invention. The cocatalyst may be an alkylaluminoxane reagent or an organoboron reagent. In one embodiment, the alkylaluminoxane reagent is selected from one or more of methylaluminoxane, ethylaluminoxane, n-propylaluminoxane and n-butylaluminoxane; the organoboron reagent being selected from [ Ph₃C][B(C₆F₅)₄]、[PhMe₂NH][B(C₆F₅)₄]、B(C₆F₅)₃One or more of them.

In one embodiment, the chain transfer agent comprises an aluminum agent or an alkyl zinc agent, the aluminum agent being of the formula AlX₃Alkyl aluminum of formula HAlX₂Of the formula AlX₂Alkylaluminum chloride of Cl and X is an alkyl group.

In another embodiment, the aluminum alkyl is selected from one or more of trimethylaluminum, triethylaluminum, tri-n-propylaluminum, triisobutylaluminum, trihexylaluminum, tri-n-butylaluminum, triisopropylaluminum, tricyclohexylaluminum, trioctylaluminum, triphenylaluminum, tri-p-tolylaluminum, tribenzylaluminum, ethyldibenzylaluminum, ethyldi-p-tolylaluminum, and diethylbenzylaluminum;

the alkyl aluminum hydride is selected from one or more of dimethyl aluminum hydride, diethyl aluminum hydride, di-n-propyl aluminum hydride, diisobutyl aluminum hydride, dihexyl aluminum hydride, di-n-butyl aluminum hydride, diisopropyl aluminum hydride, dicyclohexyl aluminum hydride, dioctyl aluminum hydride, diphenyl aluminum hydride, di-p-tolyl aluminum hydride, dibenzyl aluminum hydride, ethyl benzyl aluminum hydride, ethyl p-tolyl aluminum hydride and ethyl benzyl aluminum hydride;

the alkyl aluminum chloride is selected from one or more of dimethyl aluminum chloride, diethyl aluminum chloride, di-n-propyl aluminum chloride, diisopropyl aluminum chloride, di-n-butyl aluminum chloride, diisobutyl aluminum chloride, dipentyl aluminum chloride, dihexyl aluminum chloride, dicyclohexyl aluminum chloride, dioctyl aluminum chloride, diphenyl aluminum chloride, di-p-tolyl aluminum chloride, dibenzyl aluminum chloride, ethyl benzyl aluminum chloride and ethyl p-tolyl aluminum chloride;

the alkyl zinc reagent is selected from one or more of dimethyl zinc, diethyl zinc and diisopropyl zinc.

In one embodiment, the molar ratio of aluminum in the cocatalyst of the present invention to the metal (M) in the procatalyst is from 10 to 5000: 1; or the molar ratio of the boron in the cocatalyst to the metal in the main catalyst is 1-200: 1. In another embodiment, the molar ratio of aluminum in the chain transfer agent to the metal in the procatalyst is from 1 to 500: 1; or the molar ratio of the zinc in the chain transfer agent to the metal in the main catalyst is 1-500: 1.

Thus, the present invention provides a metallocene three-way catalyst system comprising a procatalyst, a cocatalyst and a chain transfer agent, which catalyst system is suitable for the polymerization of single or mixed long chain alpha-olefins.

The method for synthesizing the metallocene poly-alpha-olefin of the present invention can be further detailed as follows:

in the presence of inert gas, adding single or mixed long-chain alpha-olefin, a main catalyst, a cocatalyst and a chain transfer agent into a polymerization kettle in sequence for polymerization reaction; the polymerization temperature is 20 ℃ to 150 ℃, preferably 80 ℃ to 120 ℃. The single or mixed long-chain alpha-olefin used in the invention is selected from one or a mixture of more of 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1-tridecene, 1-tetradecene and 1-hexadecene.

Further, the molar ratio of the aluminum in the cocatalyst to the metal in the main catalyst is (10-5000) to 1; or the molar ratio of the boron in the cocatalyst to the metal in the main catalyst is (1-200) to 1. Wherein the molar ratio of the aluminum in the chain transfer agent to the metal in the main catalyst is (1-500) to 1; or the molar ratio of the zinc in the chain transfer agent to the metal in the main catalyst is (1-500) to 1.

The polymerization time of the present invention is generally 1 hour to 12 hours, preferably 2 hours, and the stirring is stopped after the polymerization is completed, the reaction is terminated with water, the supernatant is centrifuged, and the supernatant is decanted, and the unreacted monomer is removed by rotary evaporation to obtain the mPAO having excellent viscosity-temperature properties.

The method for testing various viscosity-temperature properties of mPAO obtained after treatment comprises the following steps:

petroleum product kinematic viscometry and dynamic viscometer algorithms: GB/T265

Calculation of viscosity index of petroleum products: GB/T1995.

The present invention will be described in further detail with reference to specific examples. However, the following examples are only for the understanding of the present invention, and the scope of the present invention is not limited thereto or thereby.

Example 1

N-butyllithium (1.6M in hexane) was slowly added dropwise to 5-phenyl-5, 10-dihydroindeno [1, 2-b ] at 0 deg.C]Slowly heating to room temperature in the diethyl ether solution of indole (molar ratio is 1.05: 1), continuing to react for 4h, draining diethyl ether, washing with anhydrous n-hexane to obtain dark yellow powder solid which is 5-phenyl-5, 10-dihydroindeno [1, 2-b ]]Li salts of indole. Reacting 5-phenyl-5, 10-dihydroindeno [1, 2-b ] at-40 deg.C]ZrCl is slowly added into the ether solution of Li salt of indole₄After warming to room temperature, the reaction was continued overnight, the ether was drained and extracted with toluene, followed by filtration to remove the formed LiCl precipitate and recrystallization of the filtrate to give complex 1.

Example 2

Methyllithium (1.2M in ether) was slowly added to the ether solution of complex 1 (molar ratio 3: 1) at-40 ℃ and allowed to warm to room temperature, followed by overnight reaction, extraction with toluene after drying of the ether, followed by filtration to remove the LiCl precipitate formed and recrystallization of the filtrate to give complex 2.

Examples 3 to 12

Synthesis of complexes 3-12 referring to example 1-2, the synthesis was carried out using different metal chlorides and indenoindole ligands.

Homogeneously catalyzed olefin copolymerization

Example 13

Alpha-olefin polymerization catalyzed by complex 1 as main catalyst

200ml of coal-made alpha-olefin mixture is weighed in a 500ml reaction bottle with magnetic stirring under the protection of high-purity nitrogen, heated to 90 ℃, added into the reaction bottle under the protection of 1ml of triethylaluminum (1.0mol/lin tolumene) nitrogen, and stirred for half an hour. 20mg of the complex 1, 5-phenyl-5, 10-dihydroindeno [1, 2-b ] indolezirconium trichloride was weighed, dissolved in 2ml of Methylaluminoxane (MAO) (1.0mol/l in tolumene), the prepared catalyst solution was charged into a reaction flask, polymerization was started, and the reaction was maintained at 90 ℃. After 2 hours, adding water to terminate the reaction, centrifuging, pouring out the supernatant, and performing rotary evaporation on the supernatant to remove unreacted monomers to obtain mPAO with excellent viscosity-temperature performance.

Example 14

Method for catalyzing d-olefin polymerization by using complex 1 as main catalyst

The polymerization conditions and procedure were the same as in example 13, except that the polymerization temperature was maintained at 100 ℃.

Example 15

Method for catalyzing d-olefin polymerization by using complex 1 as main catalyst

The polymerization conditions and procedure were the same as in example 13, except that the polymerization temperature was maintained at 110 ℃.

Example 16

Alpha-olefin polymerization catalyzed by complex 1 as main catalyst

The polymerization conditions and procedure were the same as in example 13, except that the polymerization temperature was maintained at 120 ℃.

The kinematic viscosity at 100 ℃ and the composition data of the poly-d-olefins obtained in examples 13 to 16 were measured, and the results are shown in Table 1.

TABLE 1 analysis of the composition and viscosity of the polymer products obtained in examples 1 to 4

As can be seen from the data in table 1: as the polymerization temperature increases, the dimer content in the product increases, the trimer content does not change significantly, while the tetramer and above components decrease, resulting in a decrease in the kinematic viscosity of the resulting mPAO with increasing temperature.

Example 17

Catalyzing d-olefin polymerization by using complex 3 as main catalyst

200ml of coal-made alpha-olefin mixture is weighed in a 500ml reaction bottle with magnetic stirring under the protection of high-purity nitrogen, heated to 90 ℃, added into the reaction bottle under the protection of 1ml of triethyl aluminum (1.0mol/l in toluene) nitrogen, and stirred for half an hour. 20mg of complex 3, 5-phenyl-5, 10-dihydroindeno [1, 2-b ] indole hafnium trichloride was weighed, dissolved in 2ml of Methylaluminoxane (MAO) (1.0mol/lin tolumene), the prepared catalyst solution was charged into a reaction flask, polymerization was started, and the reaction was maintained at 90 ℃. After 2 hours, adding water to terminate the reaction, centrifuging, pouring out the supernatant, and performing rotary evaporation on the supernatant to remove unreacted monomers to obtain mPAO with excellent viscosity-temperature performance.

Example 18

Alpha-olefin polymerization catalyzed by complex 5 as main catalyst

200ml of coal-made d-olefin mixture is weighed in a 500ml reaction bottle with magnetic stirring under the protection of high-purity nitrogen, heated to 90 ℃, added into the reaction bottle under the protection of 1ml of triethyl aluminum (1.0mol/l in toluene) nitrogen, and stirred for half an hour. 20mg of complex 5, 5-phenyl-5, 10-dihydroindeno [1, 2-b ] indoletitanium trichloride was weighed, dissolved in 2ml of Methylaluminoxane (MAO) (1.0mol/l in tolumene), the prepared catalyst solution was charged into a reaction flask, polymerization was started, and the reaction was maintained at 90 ℃. After 2 hours, adding water to terminate the reaction, centrifuging, pouring out the supernatant, and performing rotary evaporation on the supernatant to remove unreacted monomers to obtain mPAO with excellent viscosity-temperature performance.

Example 19

Catalytic polymerization of d-olefin with complex 7 as catalyst

200ml of coal-made alpha-olefin mixture is weighed in a 500ml reaction bottle with magnetic stirring under the protection of high-purity nitrogen, heated to 90 ℃, added into the reaction bottle under the protection of 1ml of triethyl aluminum (1.0mol/l in toluene) nitrogen, and stirred for half an hour. 20mg of complex 7, 5-phenyl-5, 10-dihydroindeno [1, 2-b ] indolezirconium trichloride was weighed, dissolved in 2ml of Methylaluminoxane (MAO) (1.0mol/l in tolumene), the prepared catalyst solution was charged into a reaction flask, polymerization was started, and the reaction was maintained at 90 ℃. After 2 hours, adding water to terminate the reaction, centrifuging, pouring out the supernatant, and performing rotary evaporation on the supernatant to remove unreacted monomers to obtain mPAO with excellent viscosity-temperature performance.

The viscosity data of the mpaos synthesized by the different procatalysts of the above examples 13, 17, 18, 19 are shown in table 2.

TABLE 2 viscosity temperature data of mPAO synthesized with different main catalysts

As can be seen from the data in table 2, the mPAO synthesized in examples 1, 5, 6 and 7 have a large viscosity index, which is 200 or more, indicating that such a heterocyclic ring-containing metallocene catalyst can provide an mPAO having excellent viscosity-temperature performance as a main catalyst.

Example 20

Catalysis of alpha-olefin polymerization using triisobutylaluminum chain transfer agents

200ml of coal-made alpha-olefin mixture is weighed in a 500ml reaction bottle with magnetic stirring under the protection of high-purity nitrogen, heated to 90 ℃, added into the reaction bottle under the protection of 1ml of triisobutylaluminum (1.0mol/l in toluene) nitrogen, and stirred for half an hour. 20mg of the complex 1, 5-phenyl-5, 10-indano [1, 2-b ] indolezirconium trichloride was weighed, dissolved in 2ml of Methylaluminoxane (MAO) (1.0mol/l in tolumene), the prepared catalyst solution was charged into a reaction flask, polymerization was started, and the reaction was maintained at 90 ℃. After 2 hours, adding water to terminate the reaction, centrifuging, pouring out supernatant liquid, and performing rotary evaporation on the supernatant liquid to remove unreacted monomers to obtain the mPAO with excellent viscosity-temperature performance.

Example 21

Catalysis of alpha-olefin polymerization using diethyl aluminum hydride chain transfer agent

200ml of coal-made alpha-olefin mixture is weighed in a 500ml reaction bottle with magnetic stirring under the protection of high-purity nitrogen, heated to 90 ℃, added into the reaction bottle under the protection of 1ml of diethyl aluminum hydride (1.0mol/l in toluene) nitrogen, and stirred for half an hour. 20mg of the complex 1, 5-phenyl-5, 10-indano [1, 2-b ] indolezirconium trichloride was weighed, dissolved in 2ml of Methylaluminoxane (MAO) (1.0mol/l in tolumene), the prepared catalyst solution was charged into a reaction flask, polymerization was started, and the reaction was maintained at 90 ℃. After 2 hours, adding water to terminate the reaction, centrifuging, pouring out supernatant liquid, and performing rotary evaporation on the supernatant liquid to remove unreacted monomers to obtain the mPAO with excellent viscosity-temperature performance.

Example 22

Catalysis of alpha-olefin polymerization using diethyl zinc chain transfer agent

200ml of coal-made d-olefin mixture is weighed in a 500ml reaction bottle with magnetic stirring under the protection of high-purity nitrogen, heated to 90 ℃, added into the reaction bottle under the protection of 1ml of diethyl zinc (1.0mol/l in toluene) nitrogen, and stirred for half an hour. 20mg of the complex 1, 5-phenyl-5, 10-indano [1, 2-b ] indolezirconium trichloride was weighed, dissolved in 2ml of Methylaluminoxane (MAO) (1.0mol/l in tolumene), the prepared catalyst solution was charged into a reaction flask, polymerization was started, and the reaction was maintained at 90 ℃. After 2 hours, adding water to terminate the reaction, centrifuging, pouring out supernatant liquid, and performing rotary evaporation on the supernatant liquid to remove unreacted monomers to obtain the mPAO with excellent viscosity-temperature performance.

The kinematic viscosities at 100 ℃ of the poly-d-olefins obtained in examples 13, 20, 21 and 22 above were measured and the results are shown in Table 3.

TABLE 3 comparison of kinematic viscosities at 100 ℃ of the polymers obtained in examples 13, 20, 21, 22

As can be seen from the data in table 3: under the same other conditions, the kinematic viscosity of mPAO can be obviously adjusted by only changing the type of the chain transfer agent. That is, the introduction of different chain transfer agents can greatly adjust the molecular weight of the polymer, which is of great significance for producing mPAO with different viscosities.

The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.