Silane compounds, catalyst compositions, and methods of making and using the same

Abstract

The application provides a silane compound, a catalyst composition and a preparation method and application thereof. The silane compound has the structure shown in the following general formula (I), wherein R1 and R2 are the same or different, R1 and R2 are each independently selected from a hydrogen atom, a halogen, a substituted or unsubstituted alkyl, a cycloalkyl, an aryl, an aralkyl, an alkylaryl, and a heteroatom-containing ring; R3, R4 and R5 are each independently selected from a C1-C8 straight chain or branched alkyl and a C1-C8 straight chain or branched alkoxy. When the silane compound of the application is applied to an olefin polymerization reaction as an external electron donor of a catalyst composition, the catalytic system has good hydrogen regulation sensitivity, and an olefin polymer with a higher yield and higher stereoregularity can be obtained.

Description

Technical Field

[0001] This invention relates to the field of olefin catalytic polymerization, specifically to a silane compound, a catalyst composition, its preparation method, and its application. Background Technology

[0002] Solid catalysts, with magnesium, titanium, halogens, and electron donors as basic components, can be used in the polymerization of ethylene or propylene. When used in propylene polymerization, both an alkylaluminum co-catalyst and an external electron donor component must be added simultaneously. Without an external electron donor, most catalysts produce polymers with low isotacticity, typically below 90%, which is detrimental to industrial production and polymer applications. Therefore, the addition of an external electron donor plays a crucial role in most propylene polymerization catalysts.

[0003] Patent CN111978346A uses an aromatic amino-siloxane compound as an external electron donor, which improves the hydrogen sensitivity of the catalyst and is used to prepare high-flow polypropylene materials. However, the isotacticity of the prepared polypropylene is relatively low. Patent CN1583805B discloses a new type of siloxane compound as an external electron donor component in olefin polymerization catalysts. When using this external electron donor for propylene polymerization, the hydrogen sensitivity is improved, but the improvement is small. Patent CN109535287A selects siloxane, glycerol fatty acid esters containing polar groups, and polyglycerol fatty acid esters as external electron donor components, which solves the problem of activity shift caused by ethers in catalytic polymerization. It is suitable for propylene polymerization in various processes. However, this external electron donor contains three compounds, making the process technology complex and costly. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the inventors unexpectedly discovered that when a novel silane compound is added as an external electron donor in the propylene polymerization catalyst, the catalytic system exhibits good hydrogen regulation sensitivity and polymerization activity, and can obtain polymers with higher isotacticity. Based on the above discovery, the purpose of this invention is to provide a silane compound, a catalyst composition, a method for preparing the same, and its application.

[0005] To achieve the above objectives, the first aspect of the present invention provides a silane compound having the structure shown in the following general formula (I),

[0006]

[0007] Among them, R1 and R2 may be the same or different, and R1 and R2 are each independently selected from hydrogen atoms, halogens, substituted or unsubstituted alkyl groups, substituted or unsubstituted cycloalkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted aralkyl groups, substituted or unsubstituted alkylaryl groups, and substituted or unsubstituted rings containing heteroatoms; R3, R4, and R5 are each independently selected from C1-C8 straight-chain or branched alkyl groups and C1-C8 straight-chain or branched alkoxy groups.

[0008] According to a specific embodiment of the present invention, preferably, in the above-mentioned silane compounds, at least one of R3, R4, and R5 is a straight-chain or branched alkoxy group selected from C1-C8.

[0009] According to a specific embodiment of the present invention, preferably, in the above-mentioned silane compounds, R1 and R2 are each independently selected from fluorine atoms, bromine atoms, methyl, ethyl, benzenesulfonylmethyl, difluoromethyl, dibromomethyl, trifluoromethyl, and tribromomethyl.

[0010] According to a specific embodiment of the present invention, preferably, in the above-mentioned silane compounds, R3, R4, and R5 are each independently selected from methyl, ethyl, n-propyl, isopropyl, methoxy, ethoxy, and 3-propoxy.

[0011] According to a specific embodiment of the present invention, preferably, the silane compound mentioned above is selected from [bis(trifluoromethanesulfonyl)amino]trimethoxysilane, [bis(trifluoromethanesulfonyl)amino]triethoxysilane, [bis(trifluoromethanesulfonyl)amino]tri(3-propoxy)silane, [bis(trifluoromethanesulfonyl)amino]methyldimethoxysilane, [bis(trifluoromethanesulfonyl)amino]methyldiethoxysilane, [bis(trifluoromethanesulfonyl)amino]methyldi(3-propoxy)silane, [bis(trifluoromethanesulfonyl)amino]dimethylmethoxysilane, [bis(trifluoromethanesulfonyl)amino]dimethylethoxysilane, [bis(trifluoromethanesulfonyl)amino]dimethyl(3-propoxy)silane, [bis(trifluoromethanesulfonyl)amino]ethyldimethoxysilane, [bis(trifluoromethanesulfonyl)amino]ethyldimethoxysilane, [bis(trifluoromethanesulfonyl)amino]... [Amino]ethyldiethoxysilane, [bis(trifluoromethanesulfonyl)amino]ethyldi(3-propoxy)silane, [bis(trifluoromethanesulfonyl)amino]diethylmethoxysilane, [bis(trifluoromethanesulfonyl)amino]diethylethoxysilane, [bis(trifluoromethanesulfonyl)amino]diethyl(3-propoxy)silane, [bis(tribromomethanesulfonyl)amino](3-propyl)dimethoxysilane, [bis(tribromomethanesulfonyl)amino](3-propyl)diethoxysilane, [bis(tribromomethanesulfonyl)amino](3-propyl)di(3-propoxy)silane, [bis(tribromomethanesulfonyl)amino]di(3-propyl)methoxysilane, [bis(tribromomethanesulfonyl)amino]di(3-propyl)ethoxysilane, [bis(tribromomethanesulfonyl)amino]di(3-propyl)(3-propoxy)silane.

[0012] According to specific embodiments of the present invention, the present invention provides five typical structural formulas of the above-mentioned silane compounds (compound AD), as follows.

[0013]

[0014] [bis(trifluoromethanesulfonyl)amino]dimethylmethoxysilane (compound A)

[0015]

[0016] [bis(trifluoromethanesulfonyl)amino]methyldimethoxysilane (compound B)

[0017]

[0018] [bis(trifluoromethanesulfonyl)amino]trimethoxysilane (compound C)

[0019]

[0020] [bis(trifluoromethanesulfonyl)amino]triethoxysilane (compound D)

[0021] A second aspect of the present invention provides a method for preparing the above-mentioned silane compounds, comprising the following steps:

[0022] A sulfonylimide compound having the structure shown in general formula (II) and an alkyllithium compound are reacted in an organic solvent under a protective atmosphere at -80°C to 30°C. Without separation, R3R4R5SiCl is added to the reaction system and the reaction continues at -80°C to 30°C. After the reaction is completed, the silane compound is obtained.

[0023]

[0024] According to a specific embodiment of the present invention, preferably, in the above preparation method, the molar ratio of the sulfonylimide compound to the alkyl lithium is 1:(1-5).

[0025] According to a specific embodiment of the present invention, preferably, in the above preparation method, the molar ratio of the sulfonyl imide compound to R3R4R5SiCl is 1:(1-5).

[0026] According to a specific embodiment of the present invention, preferably, in the above preparation method, the sulfonylimide compound reacts with alkyllithium for 1-48 hours, more preferably 2-6 hours.

[0027] According to a specific embodiment of the present invention, preferably, in the above preparation method, after adding the R3R4R5SiCl, the reaction is carried out for 1-48 hours, more preferably 2-6 hours.

[0028] According to a specific embodiment of the present invention, preferably, in the above preparation method, the organic solvent is selected from one or more of toluene, benzene, diethyl ether, tetrahydrofuran, pentane, hexane, heptane and octane, more preferably tetrahydrofuran or toluene.

[0029] According to a specific embodiment of the present invention, preferably, in the above preparation method, the alkyl lithium is butyl lithium, more preferably n-butyl lithium.

[0030] According to a specific embodiment of the present invention, preferably, in the above preparation method, the protective gas is nitrogen, helium or argon.

[0031] A third aspect of the present invention provides a catalyst composition comprising a titanium-containing solid catalyst, an alkylaluminum, and the aforementioned silane compound.

[0032] According to a specific embodiment of the present invention, preferably, in the above-described catalyst composition, the titanium-containing solid catalyst comprises titanium, magnesium, halogen, and an internal electron donor compound.

[0033] According to a specific embodiment of the present invention, preferably, in the above-described catalyst composition, the internal electron donor compound is selected from polycarboxylic acid esters, acid anhydrides, ketones, ethers, or sulfonyl compounds.

[0034] According to a specific embodiment of the present invention, preferably, the preparation method of the titanium-containing solid catalyst in the above catalyst composition includes: reacting magnesium chloride alkoxide and titanium tetrachloride at -40°C to 0°C, then heating the reaction system to 40°C-140°C, adding the electron donor compound and reacting again, filtering the solid obtained from the reaction and reacting it again with titanium tetrachloride, washing and drying the obtained solid product to obtain the titanium-containing solid catalyst.

[0035] According to a specific embodiment of the present invention, preferably, the preparation method of the main catalyst is as follows: spherical magnesium chloride alcohol particles with the general formula MgCl2·nROH are added to a titanium tetrachloride solution at low temperature and reacted for a period of time; the temperature is gradually raised to 40℃-140℃, one or two internal electron donors are added, and the reaction continues for a period of time; the mixture is filtered, a certain amount of titanium tetrachloride is added, and the reaction continues for a period of time. The addition of titanium tetrachloride and the filtration step can be repeated 1-3 times; finally, the mixture is washed with an inert hydrocarbon solvent and dried to obtain a spherical solid catalyst.

[0036] According to a specific embodiment of the present invention, preferably, in the above-described catalyst composition, the alkyl aluminum has the general formula Al(R6). n X 3-n In the formula, R6 is selected from hydrogen atoms or C1-C atoms. 20 The hydrocarbon group, where X is a halogen and n is 2 or 3.

[0037] According to a specific embodiment of the present invention, preferably, in the above catalyst composition, the alkyl aluminum is selected from triethylaluminum, tripropylaluminum, tri-n-butylaluminum, triisobutylaluminum, tri-n-octylaluminum, triisobutylaluminum, diethylaluminum hydrogen, diisobutylaluminum hydrogen, diethylaluminum chloride, diisobutylaluminum chloride, sesquiethylaluminum chloride, dichloroethylaluminum, and preferably triethylaluminum or triisobutylaluminum.

[0038] A fourth aspect of the present invention provides the application of the above-described silane compounds or the above-described catalyst compositions in olefin polymerization reactions.

[0039] According to a specific embodiment of the present invention, preferably, in the above application, the silane compound serves as an external electron donor compound in the catalyst composition.

[0040] According to a specific embodiment of the present invention, preferably, in the above application, the titanium-containing solid catalyst is used as the main catalyst and the alkyl aluminum is used as a co-catalyst.

[0041] According to a specific embodiment of the present invention, preferably, in the above applications, the olefin polymerization reaction is a homopolymerization or copolymerization reaction of propylene. The silane compounds of the present invention, as external electron donors, can be applied to olefin polymerization reactions, especially the homopolymerization or copolymerization reaction of propylene.

[0042] According to a specific embodiment of the present invention, preferably, in the above application, the polymerization temperature is 0℃-150℃, more preferably 50℃-100℃.

[0043] According to a specific embodiment of the present invention, preferably, the olefin polymerization method is an olefin polymerization reaction carried out in the presence of a main catalyst, a co-catalyst, and an external electron donor. The propylene polymerization and copolymerization of the present invention are carried out according to methods known in the art, in a bulk liquid phase or a solution in an inert solvent, or in the gas phase, or by a combined gas-liquid phase polymerization process. The polymerization temperature is generally 0°C-150°C, preferably 50°C-100°C; the polymerization reaction pressure is atmospheric pressure or higher.

[0044] The silane compounds, catalyst compositions, preparation methods, and applications of the present invention have the following beneficial effects:

[0045] When the silane compounds of the present invention are used as external electron donors in olefin polymerization reactions, the catalytic system can exhibit good hydrogen-modulated sensitivity and yield olefin polymers with high yield and high isotacticity. Detailed Implementation

[0046] In order to provide a clearer understanding of the technical features, objectives and beneficial effects of the present invention, the technical solution of the present invention will now be described in detail below, but it should not be construed as limiting the scope of implementation of the present invention.

[0047] In a specific embodiment of the present invention, the evaluation and analysis methods employed include:

[0048] (1) Adopt 1 The structure of the synthesized silane compounds was determined by 1H NMR nuclear magnetic resonance method;

[0049] (2) The isotacticity of the polymer product was determined by boiling n-heptane extraction according to the national standard GB / T 2412-2008;

[0050] (3) According to the national standard GB / T 3682-2018, the melt index of the polymer product was determined at a test temperature of 230℃ and a weight of 2.16kg.

[0051] (4) Evaluation of catalyst polymerization: Polypropylene was obtained by bulk polymerization of propylene according to the method in the example. The ratio of the mass of polypropylene to the mass of catalyst is the catalyst polymerization activity, and the activity unit is kgPP / (gcat.h).

[0052] The present invention will now be described in detail with reference to specific embodiments.

[0053] Example 1

[0054] This embodiment provides a method for preparing silane compounds and a method for olefin polymerization, as detailed below:

[0055] (1) Synthesis of [bis(trifluoromethanesulfonyl)amino]dimethylmethoxysilane (compound A)

[0056] Take a 200ml Schlenk flask, add 4g of bis(trifluoromethanesulfonyl)imide and 40ml of tetrahydrofuran (THF), cool to 0℃, and slowly add 30ml of n-butyllithium (1.6M n-hexane solution). After reacting for 2 hours, add 7g of dimethylmethoxychlorosilane, allow to rise naturally to room temperature, and react for 24 hours. Remove the solvent under vacuum, add 60ml of n-hexane, filter, then remove the n-hexane under vacuum, and distill under reduced pressure to obtain 4.5g of a yellow liquid, yield 86%. NMR data are as follows: 1 H NMR (δ, ppm, TMS, CDCl3): 3.58 (3H,s,OCH3), 0.24 (6H,s,CH3).

[0057] (2) Preparation of titanium-containing solid catalysts

[0058] 5.0 g of a spherical MgCl2·2.85C2H5OH support was added to a stirred glass reaction flask containing 150 mL of TiCl4, which had been pre-cooled to -25°C. The temperature was gradually increased to 80°C, and 2 mmol of diisobutyl phthalate (DIP), an internal electron donor, was added. This temperature was maintained for 30 minutes, and then the reaction was increased to 130°C for 2 hours. After filtration, 120 mL of TiCl4 was added, and the reaction was carried out at 130°C for 2 hours. After filtration, the above steps of adding TiCl4 and filtration were repeated once. The product was washed 6 times with n-hexane, and finally the solid was dried under vacuum to obtain 3.2 g of the spherical solid catalyst component of this invention.

[0059] (3) Propylene polymerization experiment

[0060] A 5L stainless steel reactor was fully purged with propylene gas. Then, 5ml of a 2.4mol / L triethylaluminum solution, 0.9mmol of the synthesized external electron donor compound [bis(trifluoromethanesulfonyl)amino]dimethylmethoxysilane (compound A), 20mg of the titanium-containing solid catalyst component prepared above were added, along with 0.1MPa of hydrogen gas. 2.3L of liquid propylene was then introduced, the temperature was raised to 70℃, and the reaction was maintained at this temperature for 1 hour. The reactor was then cooled, depressurized, and the polypropylene product was discharged.

[0061] Example 2

[0062] This embodiment provides a method for preparing silane compounds and a method for olefin polymerization, as detailed below:

[0063] (1) Synthesis of [bis(trifluoromethanesulfonyl)amino]methyldimethoxysilane (compound B)

[0064] Take a 200ml Schlenk flask, add 4g of bis(trifluoromethanesulfonyl)imide and 40ml of THF, cool to 0℃, slowly add 30ml of n-butyllithium (1.6M n-hexane solution), react for 2 hours, then add 7g of methyldimethoxychlorosilane, allow to naturally rise to room temperature and react for 24 hours, remove the solvent under vacuum, add 60ml of n-hexane, filter, then remove the n-hexane under vacuum, distill under reduced pressure to obtain 4.7g of yellow liquid, yield 85%. NMR data are as follows: 1 H NMR (δ, ppm, TMS, CDCl3): 3.58 (6H,s,OCH3), 0.24 (3H,s,CH3).

[0065] (2) Preparation of titanium-containing solid catalyst: Same as in Example 1.

[0066] (3) Propylene polymerization experiment

[0067] A 5L stainless steel reactor was fully purged with propylene gas. Then, 5ml of a 2.4mol / L triethylaluminum solution, 0.9mmol of the synthesized external electron donor compound [bis(trifluoromethanesulfonyl)amino]methyldimethoxysilane (compound B), 20mg of the titanium-containing solid catalyst component prepared above were added, along with 0.1MPa of hydrogen gas. 2.3L of liquid propylene was then introduced, the temperature was raised to 70℃, and the reaction was maintained at this temperature for 1 hour. The reactor was then cooled, depressurized, and the polypropylene product was discharged.

[0068] Example 3

[0069] This embodiment provides a method for preparing silane compounds and a method for olefin polymerization, as detailed below:

[0070] (1) Synthesis of [bis(trifluoromethanesulfonyl)amino]trimethoxysilane (compound C)

[0071] Take a 200ml Schlenk flask, add 4g of bis(trifluoromethanesulfonyl)imide and 40ml of THF, cool to 0℃, slowly add 30ml of n-butyllithium (1.6M n-hexane solution), react for 2 hours, then add 7g of trimethoxychlorosilane, allow to naturally rise to room temperature and react for 24 hours, remove the solvent under vacuum, add 60ml of n-hexane, filter, then remove the n-hexane under vacuum, distill under reduced pressure to obtain 4.1g of yellow liquid, yield 72%. NMR data are as follows: 1 H NMR (δ, ppm, TMS, CDCl3): 3.58 (9H, s, OCH3).

[0072] (2) Preparation of titanium-containing solid catalyst: Same as in Example 1.

[0073] (3) Propylene polymerization experiment

[0074] A 5L stainless steel reactor was fully purged with propylene gas. Then, 5ml of a 2.4mol / L triethylaluminum solution, 0.9mmol of the synthesized external electron donor compound [bis(trifluoromethanesulfonyl)amino]trimethoxysilane (compound C), 20mg of the titanium-containing solid catalyst component prepared above were added, along with 0.1MPa of hydrogen gas. 2.3L of liquid propylene was then introduced, the temperature was raised to 70℃, and the reaction was maintained at this temperature for 1 hour. The reactor was then cooled, depressurized, and the polypropylene product was discharged.

[0075] Example 4

[0076] This embodiment provides a method for preparing silane compounds and a method for olefin polymerization, as detailed below:

[0077] (1) Synthesis of [bis(trifluoromethanesulfonyl)amino]triethoxysilane (compound D)

[0078] Take a 200ml Schlenk flask, add 4g of bis(trifluoromethanesulfonyl)imide and 40ml of THF, cool to 0℃, slowly add 30ml of n-butyllithium (1.6M n-hexane solution), react for 2 hours, then add 7g of triethoxychlorosilane, allow to rise naturally to room temperature and react for 24 hours, remove the solvent under vacuum, add 60ml of n-hexane and filter, then remove the n-hexane under vacuum, distill under reduced pressure to obtain 4.8g of yellow liquid, yield 76%. NMR data are as follows: 1 H NMR (δ, ppm, TMS, CDCl3): 1.22 (9H, t, CH3), 3.83 (6H, q, OCH2).

[0079] (2) Preparation of titanium-containing solid catalyst: Same as in Example 1.

[0080] (3) Propylene polymerization experiment

[0081] A 5L stainless steel reactor was fully purged with propylene gas. Then, 5ml of a 2.4mol / L triethylaluminum solution, 0.9mmol of the synthesized external electron donor compound [bis(trifluoromethanesulfonyl)amino]triethoxysilane (compound D), 20mg of the titanium-containing solid catalyst component prepared above were added, along with 0.1MPa of hydrogen gas. 2.3L of liquid propylene was then introduced, the temperature was raised to 70℃, and the reaction was maintained at this temperature for 1 hour. The reactor was then cooled, depressurized, and discharged to obtain the polypropylene product.

[0082] Example 5

[0083] This embodiment provides a method for preparing silane compounds and a method for olefin polymerization, as detailed below:

[0084] (1) Synthesis of [bis(trifluoromethanesulfonyl)amino]dimethylmethoxysilane (compound A): Same as in Example 1.

[0085] (2) Preparation of titanium-containing solid catalyst: Same as in Example 1.

[0086] (3) Propylene polymerization experiment

[0087] A 5L stainless steel reactor was fully purged with propylene gas. Then, 5ml of a 2.4mol / L triethylaluminum solution, 0.9mmol of the synthesized external electron donor compound [bis(trifluoromethanesulfonyl)amino]dimethylmethoxysilane (compound A), 20mg of the titanium-containing solid catalyst component prepared above were added, along with 0.3MPa of hydrogen gas. 2.3L of liquid propylene was then introduced, the temperature was raised to 70℃, and the reaction was maintained at this temperature for 1 hour. The reactor was then cooled, depressurized, and the polypropylene product was discharged.

[0088] Example 6

[0089] This embodiment provides a method for preparing silane compounds and a method for olefin polymerization, as detailed below:

[0090] (1) Synthesis of [bis(trifluoromethanesulfonyl)amino]methyldimethoxysilane (compound B): Same as in Example 2.

[0091] (2) Preparation of titanium-containing solid catalyst: Same as in Example 1.

[0092] (3) Propylene polymerization experiment

[0093] A 5L stainless steel reactor was fully purged with propylene gas. Then, 5ml of a 2.4mol / L triethylaluminum solution, 0.9mmol of the synthesized external electron donor compound [bis(trifluoromethanesulfonyl)amino]methyldimethoxysilane (compound B), 20mg of the titanium-containing solid catalyst component prepared above were added, along with 0.3MPa of hydrogen gas. 2.3L of liquid propylene was then introduced, the temperature was raised to 70℃, and the reaction was maintained at this temperature for 1 hour. The reactor was then cooled, depressurized, and the polypropylene product was discharged.

[0094] Example 7

[0095] This embodiment provides a method for preparing silane compounds and a method for olefin polymerization, as detailed below:

[0096] (1) Synthesis of [bis(trifluoromethanesulfonyl)amino]trimethoxysilane (compound C): Same as in Example 3.

[0097] (2) Preparation of titanium-containing solid catalyst: Same as in Example 1.

[0098] (3) Propylene polymerization experiment

[0099] A 5L stainless steel reactor was fully purged with propylene gas. Then, 5ml of a 2.4mol / L triethylaluminum solution, 0.9mmol of the synthesized external electron donor compound [bis(trifluoromethanesulfonyl)amino]trimethoxysilane (compound C), 20mg of the titanium-containing solid catalyst component prepared above were added, along with 0.3MPa of hydrogen gas. 2.3L of liquid propylene was then introduced, the temperature was raised to 70℃, and the reaction was maintained at this temperature for 1 hour. The reactor was then cooled, depressurized, and the polypropylene product was discharged.

[0100] Example 8

[0101] This embodiment provides a method for preparing silane compounds and a method for olefin polymerization, as detailed below:

[0102] (1) Synthesis of [bis(trifluoromethanesulfonyl)amino]triethoxysilane (compound D): Same as in Example 4.

[0103] (2) Preparation of titanium-containing solid catalyst: Same as in Example 1.

[0104] (3) Propylene polymerization experiment

[0105] A 5L stainless steel reactor was fully purged with propylene gas. Then, 5ml of a 2.4mol / L triethylaluminum solution, 0.9mmol of the synthesized external electron donor compound [bis(trifluoromethanesulfonyl)amino]triethoxysilane (compound D), 20mg of the titanium-containing solid catalyst component prepared above were added, along with 0.3MPa of hydrogen gas. 2.3L of liquid propylene was then introduced, the temperature was raised to 70℃, and the reaction was maintained at this temperature for 1 hour. The reactor was then cooled, depressurized, and the polypropylene product was discharged.

[0106] Comparative Example 1

[0107] The same titanium-containing solid catalyst components and polymerization method as in Example 1 were used, except that the external electron donor compound was replaced with cyclohexylmethyldimethoxysilane.

[0108] Comparative Example 2

[0109] The same titanium-containing solid catalyst components and polymerization method as in Example 5 were used, except that the external electron donor compound was replaced with cyclohexylmethyldimethoxysilane.

[0110] The olefin polymerization results of the above examples and comparative examples are shown in Table 1.

[0111] Table 1 Results of olefin polymerization

[0112]

[0113] As can be seen from the polymerization experiment results in Table 1, using the novel silane compound of this invention as the external electron donor, the catalyst activity and isotacticity of the resulting polymer are basically the same as those of the most commonly used organosiloxane external electron donor in industry used in the comparative example. However, when using the novel silane compound of this invention as the external electron donor, the melt index of the polypropylene obtained from the propylene polymerization reaction is significantly higher than that of the comparative example under different hydrogen conditions. Moreover, with the increase of hydrogen addition, the growth rate of the polymer melt index is significantly faster than that of the comparative example, indicating that the novel silane compound of this invention as the external electron donor catalyst for propylene polymerization has excellent hydrogen regulation sensitivity; moreover, the catalyst activity and isotacticity of polypropylene are also relatively high, and it can be used to prepare polypropylene materials with high flowability and high isotacticity.

Claims

1. A catalyst composition, characterized in that, Including titanium-containing solid catalysts, alkylaluminum and silane compounds; The silane compounds have the structure shown in the following general formula (I). General Formula (I) Among them, R1 and R2 may be the same or different, and R1 and R2 are each independently selected from difluoromethyl, dibromomethyl, trifluoromethyl, and tribromomethyl. R3, R4, and R5 are each independently selected from methyl, ethyl, methoxy, and ethoxy, and one or two of R3, R4, and R5 are selected from methoxy or ethoxy.

2. The catalyst composition according to claim 1, characterized in that, The titanium-containing solid catalyst comprises titanium, magnesium, halogens, and internal electron donor compounds.

3. The catalyst composition according to claim 2, characterized in that, The internal electron donor compound is selected from polycarboxylic acid esters, acid anhydrides, ketones, ethers, or sulfonyl compounds.

4. The catalyst composition according to claim 2, characterized in that, The preparation method of the titanium-containing solid catalyst includes: reacting magnesium chloride alkoxide and titanium tetrachloride at -40°C to 0°C, then heating the reaction system to 40°C-140°C, adding the internal electron donor compound and reacting again, filtering the solid obtained from the reaction and reacting it again with titanium tetrachloride, washing and drying the obtained solid product to obtain the titanium-containing solid catalyst.

5. The catalyst composition according to claim 1, characterized in that, The general formula of the alkylaluminum is Al(R6). n X 3-n In the formula, R6 is selected from hydrogen atoms or C1-C atoms. 20 The hydrocarbon group, where X is a halogen and n is 2 or 3.

6. The catalyst composition according to claim 1, characterized in that, The alkylaluminum is selected from triethylaluminum, tripropylaluminum, tri-n-butylaluminum, tri-n-octylaluminum, triisobutylaluminum, diethylaluminum hydrogen, diisobutylaluminum hydrogen, diethylaluminum chloride, diisobutylaluminum chloride, sesquiethylaluminum chloride, and diethylaluminum chloride.

7. The catalyst composition according to claim 6, characterized in that, The alkylaluminum is selected from triethylaluminum and triisobutylaluminum.

8. The catalyst composition according to claim 1, characterized in that, The silane compounds are selected from [bis(trifluoromethanesulfonyl)amino]methyldimethoxysilane, [bis(trifluoromethanesulfonyl)amino]methyldiethoxysilane, [bis(trifluoromethanesulfonyl)amino]dimethylmethoxysilane, [bis(trifluoromethanesulfonyl)amino]dimethylethoxysilane, [bis(trifluoromethanesulfonyl)amino]ethyldimethoxysilane, [bis(trifluoromethanesulfonyl)amino]ethyldiethoxysilane, [bis(trifluoromethanesulfonyl)amino]diethylmethoxysilane, and [bis(trifluoromethanesulfonyl)amino]diethylethoxysilane.

9. The use of the catalyst composition according to any one of claims 1-8 in olefin polymerization reactions.

10. The application according to claim 9, characterized in that, The silane compound serves as the external electron donor compound in the catalyst composition.

11. The application according to claim 9, characterized in that, The polymerization temperature is 0℃-150℃.

12. The application according to claim 9, characterized in that, The polymerization temperature is 50℃-100℃.

Images