CN112707978B - Magnesium-based catalyst component for olefin polymerization, preparation method thereof, catalyst and application - Google Patents
Magnesium-based catalyst component for olefin polymerization, preparation method thereof, catalyst and application Download PDFInfo
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- CN112707978B CN112707978B CN201911020072.1A CN201911020072A CN112707978B CN 112707978 B CN112707978 B CN 112707978B CN 201911020072 A CN201911020072 A CN 201911020072A CN 112707978 B CN112707978 B CN 112707978B
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Abstract
The invention relates to a magnesium-based catalyst component for olefin polymerization, a preparation method, a catalyst and application. The magnesium-based catalyst component comprises the reaction product of: (i) a magnesium-containing compound, (ii) an aluminum-containing substance, (iii) tin tetrachloride, (iv) an organic epoxy compound, (v) an organic alcohol, (vi) a titanium-containing compound, and optionally (vii) an electron donor. Mixing a magnesium compound, a substance containing aluminum element, tin tetrachloride, organic alcohol and an organic epoxy compound to form a mixed solution; cooling, namely dripping the titanium-containing compound into the mixed solution or dripping the mixed solution into the titanium-containing compound, and maintaining for a period of time; heating, stirring for a period of time, stopping stirring, settling, filtering, removing mother liquor, and washing solid with hydrocarbon solvent. The catalyst contains magnesium-based catalyst components and organic aluminum compounds, has better activity and bulk density, and omits the dissolution reaction step of the precipitation aid; avoiding the use of phosphorus-containing compounds and phthalic anhydride with larger toxicity, and being beneficial to environmental protection.
Description
Technical Field
The invention relates to the field of olefin polymerization catalysts, in particular to a magnesium-based catalyst component for olefin polymerization, a preparation method thereof, a catalyst and application thereof, and particularly relates to an ethylene polymerization or copolymerization catalyst.
Background
In recent years, polyolefin polymer materials have long become one of the most important materials in the society of today, and have been developed at a high speed. Especially, the rapid development of the worldwide olefin polymerization industry has shown that the development and progress of the catalyst technology for olefin polymerization has promoted the development of polyolefin basic research and its industrial technology to the greatest extent in recent decades.
In particular, the research of catalysts in the development of polyethylene has been an important place in the synthesis and production of polyethylene. The titanium catalyst has been widely used and developed because of its high catalytic efficiency and low price.
Many studies and reports on catalyst performance improvement are currently focused on the following aspects: catalytic efficiency, particle morphology control, copolymerization capability, molecular weight distribution, and the like. For the production of general polyolefin resin, on the basis of further improving the catalyst performance, it is a development direction to simplify the catalyst preparation process, reduce the catalyst cost, develop an environmentally friendly technology to increase the benefit and enhance the competitiveness.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an olefin polymerization catalyst, in particular to a magnesium-based catalyst component for olefin polymerization, a preparation method and application thereof. Under the condition of avoiding the adoption of the organic phosphorus compound and the precipitation aid, the improved magnesium-based catalyst is prepared, the catalyst prepared by the method has better performance than the catalyst disclosed by the prior art, the dissolution reaction step of the precipitation aid is omitted, the preparation period of the catalyst is shortened, and meanwhile, the used raw materials are more environment-friendly than the organic phosphorus compound and phthalic anhydride system.
It is an object of the present invention to provide a magnesium-based catalyst component for olefin polymerization comprising the reaction product of: (i) magnesium compound, (ii) substance containing aluminum element, (iii) tin tetrachloride, (iv) organic epoxy compound, (v) organic alcohol, (vi) acyl halide compound, (vii) titanium-containing compound, and optionally (viii) electron donor.
In a preferred embodiment, the magnesium-containing compound is selected from at least one of magnesium dihalide, water or alcohol complexes of magnesium dihalide, derivatives of magnesium dihalide in which one of the halogen atoms in the molecule is replaced by a hydrocarbon or hydrocarbyloxy group.
In a further preferred embodiment, the magnesium-containing compound is selected from at least one of magnesium dichloride, magnesium dibromide, magnesium diiodide, for example magnesium dichloride.
Wherein inert diluents such as: benzene, toluene, xylene, 1, 2-dichloroethane, chlorobenzene and other hydrocarbon or halogenated hydrocarbon compounds, the inert meaning here that the diluent should not take part in the reaction and not adversely affect the dissolution of the magnesium compound.
In a preferred embodiment, the substance containing an aluminum element is at least one selected from the group consisting of metallic aluminum and inorganic aluminum compounds.
In a further preferred embodiment, the smaller the size of the metallic aluminum, the more advantageous the dispersion and the shorter the reaction time, preferably nano-aluminum powder; the inorganic aluminum compound is aluminum chloride, preferably finely powdered anhydrous aluminum chloride.
In the invention, the compound carrier is formed by compounding the aluminum-containing substance and the magnesium-containing compound, and the inventor finds that the catalyst system formed by adding the aluminum-containing substance has higher catalytic activity after a large amount of experiments, and the analysis reasons are probably due to the synergistic effect of the components after the aluminum-containing substance is added, so that the components in the catalyst component have synergistic effect and act as a whole and cannot be split and analyzed.
In a preferred embodiment, the organic alcohol comprises C 1 ～C 12 Fatty alcohol or C of (C) 7 ～C 12 Or substituted alcohols derived therefrom.
In a further preferred embodiment, the organic alcohol is selected from at least one of methanol, ethanol, propanol, isooctanol, n-butanol, isobutanol, 2-ethylhexanol, n-octanol, dodecanol, benzyl alcohol, phenethyl alcohol.
In a still further preferred embodiment, the organic alcohol is selected from at least one of ethanol, isooctanol, n-butanol, 2-ethylhexanol, benzyl alcohol, phenethyl alcohol. When two mixed alcohols are adopted, the molar ratio of the two is 1 to 50:1, 1 to 20:1 is preferred.
In the application, the inventor successfully realizes the complete dissolution of the magnesium-containing compound through the combined use of the alcohol compound and the epoxy compound, thereby avoiding the use of the organic phosphorus compound; the inventors have also unexpectedly found that the dissolution effect of the magnesium-containing compound is better when two or more alcohol compounds are used. Meanwhile, different alcohols generate different titanium products in the later reaction with titanium-containing compounds, so that when more than two kinds of alcohol compounds are adopted, more than two kinds of titanium products are obtained, and when the titanium-containing compounds are applied to the preparation of polyolefin, a polymer with wider molecular weight distribution is obtained, thereby being beneficial to the processability of the polymer.
In a preferred embodiment, the organic epoxy compound comprises C 2 ～C 8 An oxide of an aliphatic olefin, an oxide of an aliphatic diene, an oxide of a halogenated aliphatic olefin, an oxide of a halogenated aliphatic diene, a glycidyl ether and an internal ether.
In a further preferred embodiment, the organic epoxy compound is selected from at least one of ethylene oxide, propylene oxide, butylene oxide, butadiene double oxide, epichlorohydrin, methyl glycidyl ether, diglycidyl ether, tetrahydrofuran.
In a still further preferred embodiment, the organic epoxy compound is at least one selected from the group consisting of ethylene oxide, propylene oxide, epichlorohydrin, tetrahydrofuran, such as tetrahydrofuran and/or epichlorohydrin, and most preferably.
In the invention, not only the organic alcohol is adopted to dissolve the magnesium-containing compound, but also the organic epoxy compound is adopted to further promote the dissolution of the magnesium-containing compound.
In the prior art, chinese patent CN111516a discloses a process for the polymerization or copolymerization of ethylene, the titanium-containing component of the catalyst being prepared by the steps of: (1) Dissolving magnesium halide in an organic epoxy compound and an organic phosphorus compound to form a uniform solution; (2) Simultaneously or respectively carrying out contact reaction with at least one organic alcohol and at least one compound selected from C3-C5 cyclic ethers during or after complete dissolution; (3) And (3) carrying out contact reaction on the mixture obtained in the step (2) and at least one Ti-containing compound in the presence of at least one organic anhydride to obtain the titanium-containing solid catalyst component. When the catalyst system is used for ethylene polymerization, the defect of low apparent density of the obtained polymer is obviously existed. Chinese patent CN1229092a proposes a catalyst for polymerization or copolymerization of ethylene and a process for preparing the same, wherein the catalyst is obtained by dissolving magnesium halide in an organic epoxy compound, adding an organic phosphorus compound to an electron donor to form a homogeneous solution, reacting with at least one precipitation aid and a halide of transition metal titanium or a derivative thereof, and combining with an organic aluminum compound during polymerization. The catalyst shows higher activity when used for ethylene polymerization, and the apparent density of the obtained polymer is higher.
In the preparation process of the two catalysts disclosed in the patent, in order to obtain catalyst solids, the organic phosphorus compounds are adopted in the dissolution system, and meanwhile, the method of adding the precipitation aid is also adopted, especially in the embodiment, phthalic anhydride is adopted as the precipitation aid, and the phthalic anhydride is completely dissolved in a mixed solvent system, and then cooled and mixed with the titanium compound, so that the preparation period of the catalyst is correspondingly prolonged by using the precipitation aid. In addition, the precipitation aid system has relatively high toxicity and high requirements on operation conditions.
However, in the present invention, it is understood that, in view of the above-described one of the objects of the present invention, an organic phosphorus compound is not added, but an appropriate amount of an organic alcohol and an organic epoxy compound is used, and a phthalic anhydride-based precipitation aid is not used.
In a preferred embodiment, the acyl halide compound has the formula R (COX) a Wherein R is H, C 1 ～C 8 Aliphatic radical, C 1 ～C 8 Halogenated aliphatic hydrocarbon radicals, C 6 ～C 10 Aromatic hydrocarbon or C of (2) 6 ～C 10 X is halogen,a is 1 or 2.
In a further preferred embodiment, the acid halide compound is an acid chloride compound, preferably at least one selected from benzoyl chloride, formyl chloride and dichloroacetyl chloride, for example benzoyl chloride.
In the invention, the acyl halide compound is adopted to prepare the magnesium-based catalyst component, wherein the acyl halide compound can be used as an electron donor to improve the hydrogen regulation sensitivity of the catalyst and can be used for providing chlorine for a reaction system, so that the use of titanium tetrachloride can be saved to a certain extent.
In a preferred embodiment, the titanium-containing compound has the formula TiX n (OR) 4-n Wherein: x is halogen, R is C 1 ～C 14 Aliphatic hydrocarbon radicals or C 6 ～C 14 An aromatic hydrocarbon group, n is an integer of 0 to 4.
In a further preferred embodiment, the titanium-containing compound is selected from at least one of titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, titanium tetrabutoxide, titanium tetraethoxy, titanium monochlorotriethoxy, titanium dichlorodiethoxy, titanium trichloromonoethoxy, for example titanium tetrachloride.
The electron donors according to the present invention are compounds known to the person skilled in the art, such as: at least one of an organic ether, a silicon-containing compound, and a boron-containing compound.
Wherein:
the organic ether is at least one of methyl ether, diethyl ether, propyl ether, butyl ether, amyl ether and isoamyl ether;
the silicon-containing compound is of the formula R 1 x R 2 y Si(OR 3 ) z The silicon compounds having no active hydrogen atoms, wherein R 1 And R is 2 R is a hydrocarbon group having 1 to 10 carbon atoms or halogen 3 Is a hydrocarbon group with 1-10 carbon atoms, wherein x, y and z are positive integers, x is more than or equal to 0 and less than or equal to 2, y is more than or equal to 0 and less than or equal to 2, z is more than or equal to 0 and less than or equal to 4, and x+y+z=4; of these, at least one of silicon tetrachloride, tetramethoxysilane, tetraethoxysilane, tetrapropoxysilane, tetrabutoxysilane and tetrakis (2-ethylhexyloxy) silane is preferable, and tetrachloro is most preferableSilicon and/or tetraethoxysilane;
the boron-containing compound is represented by the general formula R 1 x R 2 y B(OR 3 ) z Boron compounds without active hydrogen atoms, where R 1 And R is 2 R is a hydrocarbon group having 1 to 10 carbon atoms or halogen 3 Is hydrocarbon group with 1-10 carbon atoms, wherein x, y and z are positive integers, x is more than or equal to 0 and less than or equal to 2, y is more than or equal to 0 and less than or equal to 1, z is more than or equal to 0 and less than or equal to 3, and x+y+z=3; among them, at least one of boron trichloride, trimethoxyborane, triethoxyborane, tripropoxyborane, tributoxyborane is preferable, and boron trichloride and/or triethoxyborane is most preferable.
In a preferred embodiment, in the magnesium-based catalyst component, the amount of the aluminum-containing element is 0.002 to 1mol, the amount of tin tetrachloride is 0.005 to 4.0mol, the amount of the organic alcohol is 0.1 to 10mol, the amount of the organic epoxy compound is 0.01 to 5mol, the amount of the acid halide compound is 0.01 to 4.0mol, the amount of the electron donor compound is 0 to 5mol, and the amount of the titanium-containing compound is 0.2 to 100mol, per mol of the magnesium-containing compound.
In a further preferred embodiment, the magnesium-based catalyst component is used in an amount of 0.005 to 0.5mol, tin tetrachloride is 0.02 to 1.0mol, organic alcohol is 0.2 to 6mol, organic epoxy compound is 0.02 to 2mol, acyl halide compound is 0.02 to 2.0mol, electron donor compound is 0 to 1mol, and titanium-containing compound is 1.0 to 20mol per mol of magnesium-containing compound.
In a still further preferred embodiment, the magnesium-based catalyst component is used in an amount of 0.0075 to 0.4mol, tin tetrachloride is 0.1 to 0.65mol, organic alcohol is 3.5 to 6.0mol, organic epoxy compound is 0.25 to 1.5mol, acyl halide compound is 0.05 to 1.25mol, electron donor compound is 0 to 0.5mol, and titanium-containing compound is 6.0 to 20mol per mol of magnesium-containing compound.
It is another object of the present invention to provide a process for producing the magnesium-based catalyst component for olefin polymerization according to one of the objects of the present invention.
In a preferred embodiment, the preparation method is as follows: (1) Mixing a magnesium compound and a substance containing aluminum element with stannic chloride, organic alcohol and organic epoxy compound, and then adding acyl halide compound to form a mixed solution; (2) Cooling treatment, namely dripping the titanium-containing compound into the mixed solution or dripping the mixed solution into the titanium-containing compound, and preferably, maintaining (a period of time) the mixed solution after the dripping is finished; (3) Heating, stirring (for a period of time), stopping stirring, settling, filtering, removing mother liquor, washing solid matter with hydrocarbon solvent to obtain the magnesium-based catalyst component for olefin polymerization.
In a further preferred embodiment, an electron donor compound may also be added in the preparation, preferably in step (1) or step (2).
In a still further preferred embodiment, said step (1) is carried out at a temperature of from 0 to 170 ℃, preferably from 40 to 140 ℃; the step (2) is carried out at-35 to 60 ℃, preferably-30 to 20 ℃.
The magnesium-based catalyst component obtained by the preparation method of the invention is powdery solid particles, the average particle size is about 2-50 microns, and the particle size can be controlled by changing the preparation conditions.
The invention also provides a catalyst for olefin polymerization, which comprises the following components:
a) A magnesium-based catalyst component, preferably a magnesium-based catalyst component according to one of the objects of the present invention or a magnesium-based catalyst component according to the second of the objects of the present invention;
b) The general formula is AlR n X 3-n Wherein R is a hydrocarbon group having 1 to 20 carbon atoms, X is a halogen, and n is an integer of 0 < n.ltoreq.3.
Wherein the general formula is AlR n X 3-n Wherein R is an alkyl group, an aralkyl group or an aryl group; x is chlorine or bromine. Preferably, the organoaluminum compound comprises trialkylaluminum, alkylaluminum chloride; more preferably, the organoaluminum compound is at least one member selected from the group consisting of trimethylaluminum, triethylaluminum, triisobutylaluminum, trioctylaluminum, diethylaluminum monochloride, diisobutylaluminum monochloride, sesquiethylaluminum chloride, ethylaluminum dichloride, for example, from the group consisting of triethylaluminumBase aluminum and/or triisobutyl aluminum.
In a preferred embodiment, the molar ratio of component B) to component A) is from (5 to 1000): 1, preferably (20 to 800): 1.
wherein the molar amount of component B) is based on the molar amount of aluminum element therein and the molar amount of component A) is based on the molar amount of titanium element therein.
Component A) of the catalyst system according to the invention, which can be used in the form of solids or suspensions, and component A) and component B) of the catalyst system according to the invention can be applied directly to the polymerization system or can be pre-complexed and then applied to the polymerization system.
The fourth object of the present invention is to provide the use of the catalyst for olefin polymerization according to the third object of the present invention in olefin homo-polymerization or copolymerization, especially for ethylene homo-polymerization and ethylene copolymerization with alpha-olefin, and the comonomer may be propylene, butene, pentene, hexene, octene, 4-methyl 1-pentene.
Among them, when applied to polymerization, liquid-phase polymerization or gas-phase polymerization may be employed. In the case of the liquid phase polymerization, an inert solvent such as saturated aliphatic hydrocarbon or aromatic hydrocarbon, e.g., propane, hexane, heptane, cyclohexane, isobutane, isopentane, naphtha, raffinate oil, hydrogenated gasoline, kerosene, benzene, toluene, xylene, etc., may be used as the reaction medium, and the polymerization may be performed before the polymerization. The polymerization may be carried out batchwise, semi-continuously or continuously.
When the catalyst is used for polymerization, the polymerization temperature is room temperature to 150 ℃, preferably 50 ℃ to 100 ℃. In order to regulate the molecular weight of the polymer, hydrogen is used as a molecular weight regulator.
Compared with the prior art, the invention has the following obvious advantages: the catalyst prepared by the method has better activity and bulk density, and particularly the use amount of titanium tetrachloride is obviously reduced after the acyl halide compound is added; the dissolution reaction step of the precipitation aid is omitted, and the preparation period of the catalyst is shortened; meanwhile, the method avoids using phosphorus-containing compounds and phthalic anhydride with larger toxicity, which is more beneficial to environmental protection; in addition, the magnesium-based catalyst component for polymerization contains stannic chloride, which is more beneficial to precipitation of the magnesium-based catalyst component during preparation and endows the magnesium-based catalyst component with more excellent bulk density.
Detailed Description
The invention will be further illustrated with reference to the following examples. The present invention is not limited by these examples.
Example 1
(1) Preparation of magnesium-based catalyst component A)
In the warp of high purity N 2 In a fully replaced reactor, 0.04mol of anhydrous MgCl is added in sequence 2 0.0015mol of metallic aluminum and 0.4mol of n-decane, 0.0043mol of anhydrous tin tetrachloride and 0.13mol of isooctanol and 0.02mol of n-butanol are added, the temperature is raised to 130 ℃, the temperature is reduced to 70 ℃, 0.03mol of epichlorohydrin is added, the temperature is maintained for half an hour, 0.002mol of benzoyl chloride is added, the temperature is reduced to-5 ℃, then 0.5mol of titanium tetrachloride is dripped into the catalyst, the temperature is maintained for half an hour, 0.015mol of tetraethoxysilane is added, the temperature is maintained for 1 hour, the temperature is raised to 110 ℃, the temperature is maintained for 1 hour, the catalyst is filtered, washed for 4 times by hexane, and the catalyst component of magnesium base is obtained through vacuum drying.
(2) Homo-polymerization
After the stainless steel reaction kettle with the volume of 2L is fully replaced by high-purity hydrogen, 1L of hexane and 1.0mL of 1M triethylaluminum hexane solution are added, 9-12 mg of the magnesium-based catalyst component A) prepared by the method is added, the temperature is raised to 70 ℃, the hydrogen is introduced to enable the pressure in the kettle to reach 0.26MPa (gauge pressure), the ethylene is introduced to enable the total pressure in the kettle to reach 0.72MPa (gauge pressure), and the polymerization is carried out for 2 hours at 80 ℃, wherein the polymerization result is shown in Table 1.
Example 2
(1) Preparation of magnesium-based catalyst component A)
In the warp of high purity N 2 In a fully replaced reactor, 0.04mol of anhydrous MgCl is added in sequence 2 0.006mol of metallic aluminum and 0.4mol of n-decane, 0.009mol of silicon tetrachloride and 0.0086mol of anhydrous tin tetrachloride are added, the reaction is continued for 5 minutes, 0.13mol of isooctyl alcohol is added, the temperature is raised to 130 ℃ for half an hour, 0.04mol of n-butanol is added, the reaction is continued for half an hour, the temperature is lowered to 70 ℃,adding 0.03mol of epichlorohydrin, maintaining for half an hour, adding 0.010mol of benzoyl chloride, cooling to-10 ℃, dropping 0.45mol of titanium tetrachloride into the mixture, maintaining for 1 hour, heating to 110 ℃, maintaining for 1 hour, filtering, washing with hexane for 4 times, and vacuum drying to obtain the magnesium-based catalyst component.
(2) Homo-polymerization
The polymerization results are shown in Table 1, as in example 1.
Example 3
(1) Preparation of magnesium-based catalyst component A)
In the warp of high purity N 2 In the fully replaced reactor, 0.03mol of anhydrous MgCl is added in sequence 2 0.012mol of anhydrous aluminum chloride and 0.4mol of n-decane, 0.01mol of silicon tetrachloride and 0.017mol of anhydrous tin tetrachloride are added, the reaction is maintained for 5 minutes, 0.13mol of isooctanol is added, the temperature is raised to 130 ℃ for half an hour, 0.04mol of n-butanol is added, the reaction is maintained for half an hour, the temperature is lowered to 70 ℃, 0.0075mol of epichlorohydrin is added, the reaction is maintained for half an hour, 0.020mol of benzoyl chloride is added, the temperature is lowered to-15 ℃, then 0.35mol of titanium tetrachloride is dripped into the reaction product, the reaction product is maintained for 1 hour, the reaction product is heated to 110 ℃, the reaction product is filtered, washed with hexane for 4 times and dried in vacuum, and then the magnesium-based catalyst component is obtained.
(2) Homo-polymerization
The polymerization results are shown in Table 1, as in example 1.
Example 4
(1) Preparation of magnesium-based catalyst component A)
In the warp of high purity N 2 In a fully replaced reactor, 0.04mol of anhydrous MgCl is added in sequence 2 0.0003mol of anhydrous aluminum chloride and 0.6mol of toluene, 0.026mol of anhydrous tin tetrachloride and 0.07mol of n-butanol, 0.07mol of ethanol and 0.06mol of epichlorohydrin are added, the temperature is raised to 80 ℃ for 1 hour, 0.050mol of benzoyl chloride is added, the temperature is lowered to 20 ℃, then 0.3mol of titanium tetrachloride is dripped into the mixture for half an hour, the temperature is raised to 85 ℃ for 1 hour, the mixture is filtered, washed with hexane for 4 times, and vacuum-dried, so that the magnesium-based catalyst component is obtained.
(2) Homo-polymerization
The polymerization results are shown in Table 1, as in example 1.
Example 5
(1) Preparation of magnesium-based catalyst component A)
In the warp of high purity N 2 In a fully replaced reactor, 0.04mol of anhydrous MgCl is added in sequence 2 0.0003mol of anhydrous aluminum chloride and 0.6mol of toluene, 0.026mol of anhydrous tin tetrachloride and 0.07mol of n-butanol, 0.07mol of phenethyl alcohol and 0.04mol of epichlorohydrin are added, the temperature is raised to 80 ℃ for 1 hour, 0.050mol of benzoyl chloride is added, the temperature is lowered to 20 ℃, then 0.3mol of titanium tetrachloride is dripped into the mixture for half an hour, the temperature is raised to 85 ℃ for 1 hour, the mixture is filtered, washed with hexane for 4 times and dried in vacuum, and the magnesium-based catalyst component is obtained.
(2) Homo-polymerization
The polymerization results are shown in Table 1, as in example 1.
Example 6
(1) Preparation of magnesium-based catalyst component A)
In the warp of high purity N 2 In a fully replaced reactor, 0.04mol of anhydrous MgCl is added in sequence 2 0.0004mol of anhydrous aluminum chloride and 0.6mol of toluene, 0.026mol of anhydrous tin tetrachloride are added, 0.16mol of n-butanol is added, the temperature is raised to 110 ℃, the temperature is reduced to 60 ℃ for 1 hour, 0.04mol of epichlorohydrin is added, the temperature is maintained for half an hour, 0.050mol of benzoyl chloride is added, the temperature is reduced to 20 ℃, then 0.3mol of titanium tetrachloride is dripped into the mixture for half an hour, the temperature is raised to 85 ℃ for 1 hour, the mixture is filtered, washed with hexane for 4 times, and vacuum drying is carried out, so that the magnesium-based catalyst component is obtained.
(2) Homo-polymerization
The polymerization results are shown in Table 1, as in example 1.
Comparative example 1
(1) Preparation of magnesium-based catalyst component A)
In the warp of high purity N 2 In a fully replaced reactor, 0.04mol of anhydrous MgCl is added in sequence 2 0.6mol of toluene, 0.03mol of epichlorohydrin, 0.02mol of tributyl phosphate and 0.06mol of ethanol are added under stirring, the temperature is raised to 60 ℃ and maintained for 1 hour, 0.0074mol of phthalic anhydride is added and maintained for half an hour, the solution is cooled to-15 ℃, and 0.60mol of tetrachloroTitanium was dropped thereinto for 1 hour, then heated to 60℃for 1 hour, filtered, washed with hexane 4 times, and vacuum-dried to obtain a magnesium-based catalyst component A).
(2) Homo-polymerization
The polymerization results are shown in Table 1, as in example 1.
Comparative example 2
(1) Preparation of magnesium-based catalyst component: as in comparative example 1, phthalic anhydride was changed to 0.011mol alone.
(2) Homo-polymerization
The polymerization results are shown in Table 1, as in example 1.
Comparative example 3
(1) Preparation of magnesium-based catalyst component A)
In the warp of high purity N 2 In a fully replaced reactor, 0.04mol of anhydrous MgCl is added in sequence 2 0.30mol of n-decane, adding 0.15mol of 2-ethylhexanol under stirring, heating to 115 ℃, maintaining the temperature for 1 hour, cooling to 50 ℃, adding 0.026mol of silicon tetrachloride, cooling the solution to-10 ℃, dripping 0.45mol of titanium tetrachloride into the solution, maintaining the temperature for 1 hour, heating to 120 ℃, maintaining the temperature for 1 hour, filtering, washing with hexane for 4 times, and vacuum drying to obtain the magnesium-based catalyst component A.
(2) Homo-polymerization
The polymerization results are shown in Table 1, as in example 1.
Comparative examples 4 to 6
Comparative examples 4 to 6 were obtained by repeating the procedures of example 1, examples 3 and 4, respectively, except that no benzoyl chloride was added, and the polymerization results are shown in Table 1.
TABLE 1
From the data in Table 1, it can be seen that the catalysts of the present invention have better activity and bulk density under the same polymerization conditions than those of comparative examples 1 to 3, and at the same time, the catalysts of the present invention have more excellent hydrogen adjusting properties under the same polymerization conditions than those of comparative examples 4 to 6.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.
Claims (17)
1. A magnesium-based catalyst component for olefin polymerization, characterized in that the magnesium-based catalyst component comprises the reaction product of: (i) a magnesium-containing compound, (ii) an element-containing substance, (iii) tin tetrachloride, (iv) an organic epoxy compound, (v) an organic alcohol, (vi) an acyl halide compound, (vii) a titanium-containing compound, and optionally (viii) an electron donor compound; wherein the substance containing aluminum element is selected from at least one of metallic aluminum and inorganic aluminum compound; the amount of the aluminum-containing substance is 0.002 to 1.0mol, the amount of the tin tetrachloride is 0.005 to 4.0mol, the amount of the organic epoxy compound is 0.01 to 5mol, the amount of the organic alcohol is 0.1 to 10mol, the amount of the acyl halide compound is 0.01 to 4.0mol, the amount of the titanium-containing compound is 0.2 to 100mol, and the amount of the electron donor is 0 to 5mol, per mol of the magnesium compound, wherein the molar amount of the magnesium compound is calculated based on the molar amount of the magnesium element, the molar amount of the aluminum-containing substance is calculated based on the molar amount of the aluminum element, and the molar amount of the titanium compound is calculated on the molar amount of the titanium element.
2. A magnesium based catalyst component for olefin polymerization according to claim 1, characterized in that:
the organic epoxy compound includes C 2 ～C 8 An oxide of an aliphatic olefin, an oxide of an aliphatic diene, an oxide of a halogenated aliphatic olefin, an oxide of a halogenated aliphatic diene, a glycidyl ether; and/or
The organic alcohol comprises C 1 ～C 12 Fatty alcohol or C of (C) 7 ～C 12 Or substituted alcohols derived therefrom; and/or
The acid halide compoundHas the general formula R (COX) a Wherein R is H, C 1 ～C 8 Aliphatic radical, C 1 ～C 8 Halogenated aliphatic hydrocarbon radicals, C 6 ～C 10 Aromatic hydrocarbon or C of (2) 6 ～C 10 X is halogen and a is 1 or 2.
3. A magnesium based catalyst component for olefin polymerization according to claim 1, characterized in that:
the organic epoxy compound is at least one selected from ethylene oxide, propylene oxide, epichlorohydrin and tetrahydrofuran; and/or
The organic alcohol is at least one selected from methanol, ethanol, propanol, isooctanol, n-butanol, isobutanol, 2-ethylhexanol, n-octanol, dodecanol, benzyl alcohol and phenethyl alcohol; and/or
The acyl halide compound is acyl chloride compound.
4. A magnesium-based catalyst component for olefin polymerization according to claim 3, characterized in that: the acyl halide compound is at least one selected from benzoyl chloride, formyl chloride and dichloroacetyl chloride.
5. A magnesium based catalyst component for olefin polymerization according to claim 2, characterized in that: based on each mole of the magnesium compound,
the consumption of the stannic chloride is 0.02-1.0 mol; and/or
The dosage of the organic alcohol is 0.2 to 6 mol; and/or
The dosage of the organic epoxy compound is 0.02-2 mol; and/or
The amount of the acid halide compound is 0.02 to 2.0 mol.
6. A magnesium based catalyst component for olefin polymerization according to claim 1, characterized in that:
the metal aluminum is nano aluminum powder, and the inorganic aluminum compound is aluminum chloride; and/or
The magnesium-containing compound is selected from at least one of magnesium dihalide, water or alcohol complex of magnesium dihalide and derivative of magnesium dihalide in which one halogen atom is replaced by hydrocarbon group or hydrocarbyloxy group; and/or
The amount of the substance containing an aluminum element is 0.005 to 0.5mol per mol of the magnesium compound.
7. The magnesium-based catalyst component for olefin polymerization according to claim 6, wherein: the magnesium-containing compound is at least one selected from magnesium dichloride, magnesium dibromide and magnesium diiodide.
8. The magnesium-based catalyst component for olefin polymerization according to any one of claims 1 to 7, characterized in that:
the general formula of the titanium-containing compound is TiX n (OR) 4-n Wherein: x is halogen, R is C 1 ～C 14 Aliphatic hydrocarbon radicals or C 6 ～C 14 An aromatic hydrocarbon group, n is an integer of 0 to 4; and/or
The electron donor is selected from at least one of organic ether, silicon-containing compound and boron-containing compound; and/or
The dosage of the titanium-containing compound is 1.0 to 20mol per mol of the magnesium compound; and/or the dosage of the electron donor is 0 to 1mol.
9. The magnesium-based catalyst component for olefin polymerization according to claim 8, wherein: the titanium-containing compound is at least one of titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, titanium tetrabutoxide, titanium tetraethoxy, titanium monochlorotriethoxy, titanium dichlorodiethoxy and titanium trichloromonoethoxy.
10. The process for preparing a magnesium-based catalyst component for olefin polymerization according to one of claims 1 to 9, which is carried out as follows: (1) Mixing a magnesium compound and a substance containing aluminum element with stannic chloride, organic alcohol and organic epoxy compound, and then adding acyl halide compound to form a mixed solution; (2) Cooling, namely dripping the titanium-containing compound into the mixed solution or dripping the mixed solution into the titanium-containing compound; (3) Heating, stirring, stopping stirring, settling, filtering, removing mother liquor, washing solid matter with hydrocarbon solvent to obtain magnesium-base catalyst component for olefine polymerization.
11. The preparation method according to claim 10, wherein,
the temperature of the step (1) is between 0 and 170 ℃; and/or
The temperature of the step (2) is between minus 35 and 60 ℃.
12. The preparation method according to claim 11, wherein,
the electron donor compound is added in the step (1) or the step (2); and/or
The step (1) is carried out at 40-140 ℃; and/or
The step (2) is carried out at the temperature of minus 30 to 20 ℃.
13. A catalyst for olefin polymerization, characterized in that the catalyst comprises:
a) A magnesium-based catalyst component for olefin polymerization according to any one of claims 1 to 9 or prepared according to the preparation method of any one of claims 10 to 12;
b) The general formula is AlR n X 3-n Wherein R is a hydrocarbon group having 1 to 20 carbon atoms, X is a halogen, and n is an integer of 0 < n.ltoreq.3.
14. The catalyst for olefin polymerization according to claim 13, wherein B) is represented by the formula AlR n X 3-n Wherein R is an alkyl, aralkyl or aryl group; x is chlorine or bromine.
15. The catalyst for olefin polymerization according to claim 13, wherein,
the organoaluminum compound includes trialkylaluminum, alkylaluminum chloride; and/or
The molar ratio of component B) to component A) is (5-1000): 1, a step of; wherein the molar amount of component B) is based on the molar amount of aluminum element therein and the molar amount of component A) is based on the molar amount of titanium element therein.
16. The catalyst for olefin polymerization according to claim 15, wherein,
the organic aluminum compound is at least one selected from trimethylaluminum, triethylaluminum, triisobutylaluminum, trioctylaluminum, diethylaluminum chloride, diisobutylaluminum chloride, sesquiethylaluminum chloride and ethylaluminum dichloride; and/or
The molar ratio of component B) to component A) is (20-800): 1, a step of; wherein the molar amount of component B) is based on the molar amount of aluminum element therein and the molar amount of component A) is based on the molar amount of titanium element therein.
17. Use of the catalyst for olefin polymerization according to any one of claims 13 to 16 in olefin homo-or copolymerization.
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