A catalyst component, a process for the preparation thereof and a catalyst

Abstract

The present application discloses a catalyst component, its preparation method and catalyst. The catalyst component comprises 1) a magnesium complex; 2) a titanium-containing compound; 3) a reaction product of an internal electron donor compound, wherein the internal electron donor compound is selected from compound I shown in formula (I) and / or compound II shown in formula (II): When the catalyst component is used for ethylene polymerization or copolymerization, it has the characteristics of high activity and high hydrogen regulation, and the polymer obtained by polymerization has the characteristics of high bulk density and low fine powder content.

Description

Technical Field

[0001] This invention relates to the technical field of catalyst components for olefin polymerization, and more specifically, to a catalyst component for olefin homopolymerization and copolymerization, a method for preparing the same, and a catalyst thereof. Background Technology

[0002] Polyethylene, as the world's largest-produced synthetic resin, is the most widely used synthetic resin. Catalyst technology is a key core technology in the synthesis of polyethylene resin and a crucial breakthrough point for achieving high performance in polyethylene resin. With the continuous development of polyolefin catalyst technology, downstream enterprises are increasingly demanding higher performance from catalysts. In addition to catalyst activity and hydrogen regulation, long-term full-load operation of the plant is a core indicator of concern for enterprises. This requires that the polymerized powder have good particle morphology and flowability, and that the polymer has a high bulk density.

[0003] Alkoxymagnesium supported catalysts have become important catalysts for olefin polymerization due to their advantages such as good particle shape and excellent hydrogen regulation performance. The activity of alkoxymagnesium catalysts, the bulk density of polymers, and the content of fine powder have always been the focus of researchers.

[0004] Chinese patent CN 108341899A discloses a catalyst for ethylene polymerization or copolymerization, which uses long-chain alkanes, diesters, polyol esters, or 1,3-diether compounds as modifiers, resulting in a catalyst with high activity, high packing density, and low fine powder content. Chinese patent CN 119219807A uses a chlorosilane-modified catalyst to solve the problems of difficult particle size control and brittleness in existing technologies. However, improvements to existing technologies for alkoxymagnesium catalysts still have limitations in balancing performance, particularly between activity, hydrogen regulation performance, polymer packing density, and fine powder content.

[0005] Therefore, developing alkoxymagnesium catalysts for ethylene polymerization with excellent comprehensive performance can help enterprises reduce costs and increase efficiency while comprehensively improving the performance of existing catalysts. Summary of the Invention

[0006] To address the problems existing in the prior art, this invention proposes a solid catalyst component, a catalyst, its preparation method, and an olefin polymerization method for olefin polymerization. During the research process, this invention discovered that by introducing compounds of formula (I) and / or formula (II) as electron donors into an alkoxymagnesium catalyst system, the catalyst exhibits excellent activity and hydrogen regulation performance when used for ethylene slurry polymerization / copolymerization, and the polymer bulk density is significantly increased with low fine powder content.

[0007] A first aspect of the present invention provides a catalyst component for olefin polymerization, the solid catalyst component comprising the reaction products of the following components:

[0008] 1) Magnesium complex;

[0009] The magnesium complex is selected from those with the general formula Mg(OR5). m (OR6) n (OR7) 2-m-n alkoxymagnesium compounds, wherein R5 and R6 are each independently selected from substituted or unsubstituted C1-C6 groups. 10 The hydrocarbon group, 0≤m≤2, 0≤n≤2; preferably, the magnesium complex is preferably selected from Mg(OEt)2, Mg(OC3H7)2, Mg(OC4H9)2, Mg(OEt)2. m (OEHA) 2-m Mg(OEt) m (OMe) n (OEHA) 2-m-n Mg(OEt) m (OiPr) n (OEHA) 2-m-n Mg(OC8H) 17 2. Mg(OEt) m (OMe) n (OBu) 2-m-n Mg(OEt) m (OBu) 2-m Mg(OEt) m (OiPr) n (OMe) 2-m-n Mg(OEt) m (OBu) n (OiPr) 2-m-n Mg(OEt) m (OiPr) 2-m Mg(OEt) m (OMe) 2-m At least one of them;

[0010] 2) Titanium-containing compounds;

[0011] The general formula of the titanium-containing compound is Ti(OR8). y X 4-y In the formula, R8 represents C1 to C2. 10 The hydrocarbon group, where X is a halogen atom, 0≤y≤3; preferably, R8 is selected from C1~C6 alkyl, C2~C6 alkenyl, C3 ... 10 cycloalkyl groups, or C6-C6 groups 10The aromatic hydrocarbon group, more preferably, R8 is selected from methyl, ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, cyclopropyl, methylcyclopropyl, methylcyclopentyl, cyclohexyl, phenyl, benzyl, or xylylyl; even more preferably, the titanium-containing compound is selected from at least one of TiCl4, Ti(OC2H5)Cl3, Ti(OCH3)Cl3, and Ti(OC4H9)Cl3. The titanium-containing compound can be added all at once during the reaction or added in stages.

[0012] 3) An internal electron donor compound, wherein the internal electron donor compound is selected from compound I of formula (I) and / or compound II of formula (II);

[0013]

[0014] In formula (Ⅰ), R1 and R2 are each independently selected from substituted or unsubstituted C1 to C2. 10 The hydrocarbon group is preferably selected from C1 to C8 hydrocarbon groups, more preferably from C1 to C8 straight-chain alkyl groups, C3 to C8 branched alkyl or cycloalkyl groups, and C6 to C8 aryl groups. The hydrogen atoms in the above groups may optionally be replaced by hydroxyl groups, heteroatoms (such as halogen atoms), alkyl groups, or alkoxy groups.

[0015] The compound I is preferably selected from at least one of methyl formate, ethyl formate, propyl formate, butyl formate, pentyl formate, hexyl formate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, pentyl acetate, hexyl acetate, methyl propionate, ethyl propionate, propyl propionate, butyl propionate, pentyl propionate, hexyl propionate, methyl butyrate, ethyl butyrate, propyl butyrate, butyl butyrate, pentyl butyrate, hexyl butyrate, methyl valerate, ethyl valerate, propyl valerate, butyl valerate, pentyl valerate, hexyl valerate, methyl hexanoate, ethyl hexanoate, propyl hexanoate, butyl hexanoate, pentyl hexanoate, hexyl hexanoate, methyl benzoate, ethyl benzoate, propyl benzoate, butyl benzoate, pentyl benzoate, and hexyl benzoate.

[0016] In formula (II), R3 and R4 are each independently selected from hydrogen, substituted or unsubstituted C1 to C4. 10 The hydrocarbon group is preferably selected from hydrogen, C1-C8 hydrocarbon groups, more preferably from C1-C8 straight-chain alkyl, C3-C8 branched alkyl or cycloalkyl groups. The hydrogen atom in the above groups may optionally be replaced by a hydroxyl group, a heteroatom (such as a halogen atom), an alkyl group, or an alkoxy group.

[0017] The compound II is preferably selected from at least one of hydroquinone, 4-methoxyphenol, 4-ethoxyphenol, 4-butoxyphenol, 4-pentoxyphenol, 4-hexyloxyphenol, catechol, 2-methoxyphenol, 2-ethoxyphenol, 2-butoxyphenol, 2-pentoxyphenol, 2-hexyloxyphenol, resorcinol, 3-methoxyphenol, 3-ethoxyphenol, 3-butoxyphenol, 3-pentoxyphenol, and 3-hexyloxyphenol.

[0018] The internal electron donor compound may be at least one of compound I shown in formula (Ⅰ), at least one of compound II shown in formula (Ⅱ), and compound I and compound II.

[0019] Compound I can be an aliphatic ester (R1, R2 are straight-chain alkyl, branched alkyl, or cycloalkyl, such as methyl formate, ethyl formate, propyl formate, butyl formate, pentyl formate, hexyl formate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, pentyl acetate, hexyl acetate, methyl propionate, ethyl propionate, propyl propionate, butyl propionate, pentyl propionate, hexyl propionate, methyl butyrate, ethyl butyrate, propyl butyrate, butyrate, etc.). Butyl ester, pentyl butyrate, hexyl butyrate, methyl valerate, ethyl valerate, propyl valerate, butyl valerate, pentyl valerate, hexyl valerate, methyl hexanoate, ethyl hexanoate, propyl hexanoate, butyl hexanoate, pentyl hexanoate, hexyl hexanoate, etc.), aromatic esters (R1 and R2 are aryl groups, such as methyl benzoate, ethyl benzoate, propyl benzoate, butyl benzoate, pentyl benzoate, hexyl benzoate, etc.), or mixtures of aliphatic esters and aromatic esters.

[0020] The above internal electron-donating compounds can be added all at once during the reaction, or they can be added in portions.

[0021] The amount of the titanium-containing compound used per mole of magnesium is 0.5 to 50 mol, for example, 0.5 mol, 1 mol, 5 mol, 10 mol, 20 mol, 30 mol, 40 mol, 50 mol, etc.; the amount of compound I or compound II used is independently 0 to 2 mol, for example, 0.01 mol, 0.05 mol, 0.1 mol, 0.2 mol, 0.5 mol, 0.8 mol, 1 mol, 1.2 mol, 1.5 mol, 1.8 mol, 2 mol, etc., and the molar amounts of compound I and compound II are not both 0.

[0022] Preferably, the amount of the titanium-containing compound is 0.5 to 20 mol per mole of magnesium; the amounts of compound I and compound II are each independently 0 to 1 mol, and the molar amounts of compound I and compound II are not simultaneously 0.

[0023] When both compound I and compound II are included, the molar ratio of compound I to compound II is (0.001 to 100):1, preferably (0.001 to 10):1.

[0024] According to embodiments of the present invention, the internal electron-donating compounds represented by formula (I) and / or formula (II) can effectively regulate the type and number of active centers in the catalyst, thereby controlling a portion of the active molecular chains that generate high melt strength, which helps to resist breakage during polymerization, reduce the fine powder generated during ethylene polymerization, and thus increase the bulk density of the polymer, while also retaining the high activity and high hydrogen regulation performance of the catalyst.

[0025] A second aspect of the present invention provides a method for preparing the catalyst component for olefin polymerization described above, the method comprising the following steps:

[0026] 1) The magnesium-containing complex is dispersed in an inert solvent to form a suspension;

[0027] 2) After cooling the suspension, it is contacted with a titanium-containing compound and an internal electron donor compound to obtain a solid slurry;

[0028] 3) Separate the solids from the solid slurry, wash with an inert solvent and dry to obtain the catalyst components.

[0029] The amount of the titanium-containing compound used per mole of magnesium is 0.5 to 50 mol, preferably 0.5 to 20 mol, for example, 0.5 mol, 1 mol, 5 mol, 10 mol, 20 mol, 30 mol, 40 mol, 50 mol, etc.

[0030] The internal electron donor compound is selected from compound I of formula (I) and / or compound II of formula (II). The amount of compound I or compound II used is independently 0 to 2 mol, preferably 0 to 1 mol, for example, 0.001 mol, 0.005 mol, 0.01 mol, 0.05 mol, 0.1 mol, 0.5 mol, 1.0 mol, 1.5 mol, 2 mol, etc., and the molar amounts of compound I and compound II are not both 0.

[0031] Preferably, when both compound I and compound II are included, the molar ratio of compound I to compound II is (0.001 to 100):1, more preferably (0.001 to 10):1, for example, it can be 0.001:1, 0.005:1, 0.01:1, 0.05:1, 0.1:1, 0.5:1, 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 20:1, 30:1, 40:1, 50:1, 60:1, 70:1, 80:1, 90:1, 100:1, etc.

[0032] In step 1) or step 3), each of the inert solvents is independently selected from at least one of aromatic compounds or alkane compounds; preferably, each of the inert solvents is independently selected from at least one of benzene, toluene, hexane, heptane, octane, decane, xylene, white oil, paraffin, or silicone oil.

[0033] In step 2), the contact temperature is -20℃ to 110℃.

[0034] A third aspect of the present invention provides a catalyst for olefin polymerization, the catalyst comprising the following components:

[0035] Component I: The catalyst component described above or the catalyst component obtained by the preparation method described above;

[0036] Component II: Organoaluminum compounds;

[0037] The general formula of the organoaluminum compound is AlR d X 3-d In which the repeated R is independently hydrogen or C l ~C 20 Hydrocarbon group, X is a halogen atom, 0 <d≤3。

[0038] In the organoaluminum compound, the repeated R is independently hydrogen or C1-C2. 10 The hydrocarbon group; preferably, R is hydrogen or a C1-C5 hydrocarbon group; more preferably, the organoaluminum compound is selected from at least one of Al(CH3)3, Al(CH2CH3)3, Al(i-Bu)3, AlH(CH2CH3)2, AlH(i-Bu)2, AlCl(CH2CH3)2, Al2Cl3(CH2CH3)3, and AlCl2(CH2CH3).

[0039] The molar ratio of aluminum in component II to titanium in component I is 10:1 to 200:1, preferably 20:1 to 200:1, and can be, for example, 10:1, 20:1, 50:1, 80:1, 100:1, 150:1, 200:1, etc.

[0040] A fourth aspect of the present invention provides a method for olefin polymerization, the method comprising contacting one or more olefins with the above-described catalyst system under olefin polymerization reaction conditions.

[0041] The polymerization reaction is olefin homopolymerization or α-olefin copolymerization.

[0042] The olefin is preferably at least one selected from ethylene, propylene, butene, and hexene.

[0043] This invention provides a solid catalyst component, preparation method, catalyst system, and olefin polymerization method for ethylene polymerization or copolymerization. When used for ethylene polymerization or copolymerization, this solid catalyst component exhibits high activity and high hydrogen content, resulting in polymers with high bulk density and low fine powder content. Detailed Implementation

[0044] The present invention will now be described in detail with reference to specific embodiments. It should be noted that the following embodiments are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the content of the present invention are still within the scope of protection of the present invention.

[0045] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0046] Unless otherwise specified, the raw materials used in the examples and comparative examples are all disclosed in the prior art, such as those that can be directly purchased or prepared according to the preparation methods disclosed in the prior art.

[0047] In the following examples and comparative examples:

[0048] 1. The relative weight percentage of titanium in the solid catalyst components was characterized by spectrophotometry.

[0049] 2. Bulk density of polymer: determined by the method of weight of loose solids per unit volume (GB / T1636).

[0050] 3. The content of polymer fine powder is determined by sieving 100g of powder through a 200-mesh (75μm) sieve. The amount of polymer passing through the sieve is recorded as W, and the content of fine powder is W.

[0051] 4. Determination of polymer melt index (MI): According to ASTM D1238-99, the MI was determined at a load of 2.16 kg and a temperature of 190 °C.

[0052] 5. All pressures mentioned in the polymerization reaction are absolute pressures:

[0053] ① Polymerization reaction with low hydrogen / ethylene ratio

[0054] A 2L stainless steel reactor was fully purged with high-purity nitrogen, then 1L of hexane and 2.0mL of 1M triethylaluminum solution were added, followed by the solid catalyst components (containing 0.6mg titanium) prepared in the examples and comparative examples. The temperature was raised to 70°C, and hydrogen was introduced to bring the pressure inside the reactor to 0.28MPa. Ethylene was then introduced to bring the total pressure inside the reactor to 0.73MPa, and polymerization was carried out at 80°C for 2 hours.

[0055] ② Polymerization reaction with high hydrogen / ethylene ratio

[0056] A 2L stainless steel reactor was fully purged with high-purity nitrogen, then 1L of hexane and 2.0mL of 1M triethylaluminum were added, followed by the solid catalyst components (containing 2mg titanium) prepared in the examples and comparative examples. The temperature was raised to 70°C, and hydrogen was introduced to bring the pressure inside the reactor to 0.58MPa. Ethylene was then introduced to bring the total pressure inside the reactor to 0.73MPa, and polymerization was carried out at 85°C for 2 hours.

[0057] The present invention will be further described below with reference to specific embodiments.

[0058] Example 1

[0059] In a 300 mL stirred 5-necked reactor fully purged with nitrogen, 4 g of magnesium ethoxylate support with an average particle size of 12 μm and 40 mL of toluene were added. The mixture was cooled to -15 °C, and 1 mL of ethyl acetate was added with stirring. Then, 20 mL of TiCl4 was slowly added dropwise. After this, the temperature was raised to 80 °C and held for 1 h. 1 mL of ethyl benzoate was added, and the mixture was held at this temperature for another 1 h. The mixture was allowed to settle, and the supernatant was decanted, washed four times with hexane, separated, and dried to obtain a solid catalyst with good flowability. The catalyst composition and polymerization results are shown in Table 1.

[0060] Example 2

[0061] In a 300 mL stirred 5-necked reactor fully purged with nitrogen, 4 g of magnesium ethoxylate support with an average particle size of 12 μm and 40 mL of toluene were added. The mixture was cooled to -15 °C, and 2 mL of ethyl acetate was added with stirring, followed by the slow addition of 20 mL of TiCl4. After the reaction was completed, the temperature was raised to 80 °C and held for 2 h, then held for another 1 h. The mixture was allowed to settle, and the supernatant was decanted, washed four times with hexane, separated, and dried to obtain a solid catalyst with good flowability. The catalyst composition and polymerization results are shown in Table 1.

[0062] Example 3

[0063] In a 300 mL stirred 5-necked reactor fully purged with nitrogen, 4 g of magnesium ethoxylate support with an average particle size of 12 μm and 40 mL of toluene were added. The mixture was cooled to -15 °C, and 20 mL of TiCl4 was slowly added dropwise with stirring. After the addition was complete, the temperature was raised to 80 °C and held for 1 h. Then, 1 g of 4-ethoxyphenol was added, and the mixture was held at the same temperature for another 1 h. After settling, the supernatant was decanted, washed four times with hexane, separated, and dried to obtain a solid catalyst with good flowability. The catalyst composition and polymerization results are shown in Table 1.

[0064] Example 4

[0065] In a 300 mL stirred 5-necked reactor fully purged with nitrogen, 4 g of ethoxymagnesium support with an average particle size of 12 μm and 40 mL of toluene were added. The mixture was cooled to -15 °C, and 1.5 mL of ethyl acetate was added with stirring, followed by the slow dropwise addition of 20 mL of TiCl4. After this, the temperature was raised to 80 °C and held for 1 h. Then, 0.5 g of 4-ethoxyphenol was added, and the mixture was held at this temperature for another 1 h. The mixture was allowed to settle, and the supernatant was decanted, washed four times with hexane, separated, and dried to obtain a solid catalyst with good flowability. The catalyst composition and polymerization results are shown in Table 1.

[0066] Example 5

[0067] In a 300 mL stirred 5-necked reactor fully purged with nitrogen, 4 g of magnesium ethoxylate support with an average particle size of 12 μm and 40 mL of toluene were added. The mixture was cooled to -15 °C, and 1 mL of propyl acetate was added with stirring, followed by a slow dropwise addition of 20 mL of TiCl4. After this, the temperature was raised to 80 °C and held for 1 h. Then, 1 g of 4-propoxyphenol was added, and the mixture was held at this temperature for another 1 h. The mixture was allowed to settle, and the supernatant was decanted, washed four times with hexane, separated, and dried to obtain a solid catalyst with good flowability. The catalyst composition and polymerization results are shown in Table 1.

[0068] Example 6

[0069] In a 300 mL stirred 5-necked reactor fully purged with nitrogen, 4 g of magnesium ethoxylate support with an average particle size of 12 μm and 40 mL of toluene were added. The mixture was cooled to -15 °C, and 1 mL of ethyl benzoate was added with stirring, followed by the slow addition of 20 mL of TiCl4. After this, the temperature was raised to 80 °C and held for 1 h. Then, 1.25 g of 4-methoxyphenol was added, and the mixture was held at this temperature for another 1 h. The mixture was allowed to settle, and the supernatant was decanted, washed four times with hexane, separated, and dried to obtain a solid catalyst with good flowability. The catalyst composition and polymerization results are shown in Table 1.

[0070] Comparative Example 1

[0071] In a 300 mL stirred 5-necked reactor fully purged with nitrogen, 4 g of magnesium ethoxylate support with an average particle size of 12 μm and 40 mL of toluene were added. The mixture was cooled to -15 °C, and 20 mL of TiCl4 was slowly added dropwise with stirring. After the addition was complete, the temperature was raised to 80 °C and held at that temperature for 2 h. The mixture was allowed to settle, and the supernatant was decanted, washed four times with hexane, separated, and dried to obtain a solid catalyst with good flowability. The catalyst composition and polymerization results are shown in Table 1.

[0072] Comparative Example 2

[0073] 4.0 g magnesium chloride, 50 mL toluene, 3.0 mL epichlorohydrin, 9 mL tri-n-butyl phosphate, and 4.4 mL ethanol were added to a reactor. The reaction was carried out at 70 °C for 2 hours until the magnesium chloride was completely dissolved. The system was then cooled to -10 °C, and 70 mL titanium tetrachloride was slowly added dropwise, followed by 3 mL tetraethoxysilane. The temperature was slowly raised to 85 °C and maintained at this temperature for 2 hours. After standing, the mixture was decanted, and the solid catalyst was washed several times with hexane. After drying, a solid catalyst component with good flowability was obtained. The catalyst composition and polymerization results are shown in Table 1.

[0074] The performance parameters of the catalysts and polymers in the examples and comparative examples are shown in Table 1.

[0075] Table 1

[0076]

[0077] As shown in Table 1, when the catalyst of the present invention is used for ethylene polymerization, compared with Comparative Example 1, the activity of the catalyst and the bulk density of the polymer are significantly improved by simultaneously introducing electron-donating compounds of formula (I) and / or formula (II) into the catalyst. Compared with Comparative Example 2, the activity of some catalysts is improved to varying degrees by simultaneously introducing electron-donating compounds of formula (I) and / or formula (II) into the catalyst, and the high hydrogen melt index and polymer bulk density of the catalyst are significantly improved. The above results indicate that the catalyst of the present invention has superior overall performance compared with the comparative catalyst.

[0078] The embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A catalyst component comprising a reaction product of the following components: 1) Magnesium complex; 2) Titanium-containing compounds; 3) An internal electron-donating compound, wherein the internal electron-donating compound is selected from compound I of formula (I) and / or compound II of formula (II): In formula (Ⅰ), R1 and R2 are each independently selected from substituted or unsubstituted C1 to C2. 10 hydrocarbon group; In formula (II), R3 and R4 are each independently selected from hydrogen, substituted or unsubstituted C1 to C4. 10 hydrocarbon group; The amount of the titanium-containing compound used per mole of magnesium is 0.5 to 50 mol; the amount of compound I or compound II used is independently 0 to 2 mol, and the molar amounts of compound I and compound II are not both 0.

2. The catalyst component according to claim 1, characterized in that: Compound I is selected from at least one of methyl formate, ethyl formate, propyl formate, butyl formate, pentyl formate, hexyl formate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, pentyl acetate, hexyl acetate, methyl propionate, ethyl propionate, propyl propionate, butyl propionate, pentyl propionate, hexyl propionate, methyl butyrate, ethyl butyrate, propyl butyrate, butyl butyrate, pentyl butyrate, hexyl butyrate, methyl valerate, ethyl valerate, propyl valerate, butyl valerate, pentyl valerate, hexyl valerate, methyl hexanoate, ethyl hexanoate, propyl hexanoate, butyl hexanoate, pentyl hexanoate, hexyl hexanoate, methyl benzoate, ethyl benzoate, propyl benzoate, butyl benzoate, pentyl benzoate, and hexyl benzoate; and / or, Compound II is selected from at least one of hydroquinone, 4-methoxyphenol, 4-ethoxyphenol, 4-butoxyphenol, 4-pentoxyphenol, 4-hexyloxyphenol, catechol, 2-methoxyphenol, 2-ethoxyphenol, 2-butoxyphenol, 2-pentoxyphenol, 2-hexyloxyphenol, resorcinol, 3-methoxyphenol, 3-ethoxyphenol, 3-butoxyphenol, 3-pentoxyphenol, and 3-hexyloxyphenol.

3. The catalyst component according to claim 1, characterized in that: The magnesium complex is selected from those with the general formula Mg(OR5). m (OR6) n (OR7) 2-m-n alkoxymagnesium compounds, wherein R5 and R6 are each independently selected from substituted or unsubstituted C1-C6 groups. 10 The hydrocarbon group, 0≤m≤2, 0≤n≤2; preferably, the magnesium complex is selected from Mg(OEt)2, Mg(OC3H7)2, Mg(OC4H9)2, Mg(OEt) m (OEHA) 2-m Mg(OEt) m (OMe) n (OEHA) 2-m-n Mg(OEt) m (OiPr) n (OEHA) 2-m-n Mg(OC8H) 17 2. Mg(OEt) m (OMe) n (OBu) 2-m-n Mg(OEt) m (OBu) 2-m Mg(OEt) m (OiPr) n (OMe) 2-m-n Mg(OEt) m (OBu) n (OiPr) 2-m-n Mg(OEt) m (OiPr) 2-m Mg(OEt) m (OMe) 2-m At least one of them.

4. The catalyst component according to claim 1, characterized in that: The general formula of the titanium-containing compound is Ti(OR8). y X 4-y In the formula, R8 represents C1 to C2. 10 The hydrocarbon group, where X is a halogen atom, 0≤y≤3; preferably, R8 is selected from C1~C6 alkyl, C2~C6 alkenyl, C3 ... 10 cycloalkyl groups, or C6-C6 groups 10 The aromatic hydrocarbon group; more preferably, R8 is selected from methyl, ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, cyclopropyl, methylcyclopropyl, methylcyclopentyl, cyclohexyl, phenyl, benzyl, or xylylene; even more preferably, the titanium-containing compound is selected from at least one of TiCl4, Ti(OC2H5)Cl3, Ti(OCH3)Cl3, and Ti(OC4H9)Cl3.

5. The catalyst component according to claim 1, characterized in that: The amount of the titanium-containing compound used is 0.5–20 mol per mole of magnesium; the amount of compound I or compound II is independently 0–1 mol, and the molar amounts of compound I and compound II are not simultaneously 0; and / or, When both compound I and compound II are included, the molar ratio of compound I to compound II is preferably (0.001 to 100):1, more preferably (0.001 to 10):

1.

6. A method for preparing the catalyst component according to any one of claims 1 to 5, comprising the following steps: 1) The magnesium complex is dispersed in an inert solvent to form a suspension; 2) After cooling the suspension, it is contacted with a titanium-containing compound and an internal electron donor compound to obtain a solid slurry; 3) Separate the solids from the solid slurry, wash with an inert solvent, and dry to obtain the catalyst component.

7. The preparation method according to claim 6, characterized in that: In step 1) or step 3), each of the inert solvents is independently selected from at least one of aromatic compounds or alkane compounds; preferably, each of the inert solvents is independently selected from at least one of benzene, toluene, hexane, heptane, octane, decane, xylene, white oil, paraffin wax, and silicone oil.

8. A catalyst for olefin polymerization, comprising the following components: Component I: The catalyst component according to any one of claims 1 to 5 or the catalyst component obtained by the preparation method according to any one of claims 6 to 7; Component II: General formula AlR d X 3-d Organoaluminum compounds, wherein the repeated R is independently hydrogen or C1-C2. 20 The hydrocarbon group, where X is a halogen atom, 0 <d≤3。 9. The catalyst according to claim 8, characterized in that: The molar ratio of aluminum in component II to titanium in component I is 10:1 to 200:1, preferably 20:1 to 200:1; and / or, In the organoaluminum compound, the repeated R is independently hydrogen or C1-C2. 10 The hydrocarbon group; preferably, R is hydrogen or a C1-C5 hydrocarbon group; more preferably, the organoaluminum compound is selected from at least one of Al(CH3)3, Al(CH2CH3)3, Al(i-Bu)3, AlH(CH2CH3)2, AlH(i-Bu)2, AlCl(CH2CH3)2, Al2Cl3(CH2CH3)3, and AlCl2(CH2CH3).

10. An olefin polymerization method, comprising contacting one or more olefins with a catalyst according to any one of claims 8 to 9 under olefin polymerization reaction conditions; preferably, the polymerization reaction is olefin homopolymerization or α-olefin copolymerization.

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