CN104558312A - Method for preparing olefin polymer and olefin polymer - Google Patents

Abstract

The invention discloses a method for preparing an olefin polymer and the olefin polymer. The method comprises the steps of in the presence of an olefin polymerization catalyst, carrying out polymerization reaction on olefin represented by the general formula of CH2=CHR, wherein the olefin polymerization catalyst comprises a catalyst solid component A, an organic aluminum compound B and an organic silicon compound C; the catalyst solid component A comprises magnesium, titanium, halogen, an internal electron donor a and an internal electron donor b and the weight ratio of the internal electron donor a to the internal electron donor b is less than 1: 1, the internal electron donor a and the internal electron donor b satisfy a formula as shown in the description and the polymerization reaction temperature is 85-130 DEG C. In the presence of the olefin polymerization catalyst, the olefin polymer which has both high melt flow rate and broad molecular weight distribution can be prepared.

Description

A kind of preparation method of olefin polymer and polymkeric substance thereof

Technical field

The present invention relates to a kind of preparation method and polymkeric substance thereof of olefin polymer.

Background technology

The molecular weight distribution (MWD) of polymkeric substance affects its mechanical property and processing characteristics.High molecular weight moieties determines the long term mechanical strength of polymkeric substance to a great extent, and low molecular weight part determines its extrusion performance to a great extent.

Adopt specific olefin polymerization catalysis can obtain the polymkeric substance of wide molecular weight distribution.

CN1313869 and CN1398270 discloses a kind of succinate internal electron donor, and the Z-N catalyzer using this internal electron donor to prepare can be used for preparing and has the wide polypropylene having molecular weight distribution.

The Z-N catalyzer that the succinate of cyano group disclosed in CN101993507A makes internal electron donor also can be used for the polyolefine preparing wide molecular weight distribution.

CN1334826 discloses the scheme being prepared polyethylene with wide molecular weight distribution by the different responding abilities of two portions catalyzer to hydrogen.

In addition, special external electron donor also contributes to preparing the wider polyolefine of molecular weight distribution, can obtain molecular weight distribution wider polyolefine when dicyclopentyl dimethoxyl silane as known in the art is used as Z-N catalyzer external electron donor.But often lower to hydrogen sensitive degree during these catalyst preparing polymkeric substance, the melting index of the polymkeric substance namely prepared during identical density of hydrogen is lower.

Also wide molecular weight distribution polyolefin can be obtained by special polymerization technique.As the way of so-called asymmetric hydrogenation, namely the distribution of regulatory molecule amount is carried out by the consumption of Quality Initiative transfer agent hydrogen in multiple reactor, concrete as used a small amount of hydrogen to obtain the polymkeric substance of high molecular in the first reactor, and in the second reactor, use the hydrogen of higher concentration to obtain the relatively low polymer moieties of molecular weight, thus obtain the polymkeric substance of wide molecular weight distribution; The so-called asymmetric method adding external electron donor can also be adopted, namely the polymericular weight difference utilizing different external electron donor to obtain is to regulate and control molecular weight distribution, concrete as used the external electron donor obtaining macromolecule part as dicyclopentyl dimethoxyl silane in the first reactor, and in another reactor, use the external electron donor obtaining small molecular mass moieties as tetraethoxysilane, thus obtain the polymkeric substance of wide molecular weight distribution.But the more difficult realization in a reactor of these schemes, polymerization process is complicated.

In addition, for meeting injecting products, the especially processing request of thin wall parts, polymkeric substance often needs higher melt flow rate (MFR)-MFR(or claims melting index-MI).Improve olefin polymer such as polypropylene melt flow rate and usually adopt following method: after (1) polyreaction, add degradation agents in the polymer, one or more superoxide of usual employing, under certain reaction conditions, make the macromolecular chain generation molecular breakdown in polymkeric substance, the MFR of product is improved.This is generally referred to as controllable rheology technology.(2) increase the consumption of molecular weight regulator hydrogen in the course of the polymerization process, thus reach the object improving MFR.(3) catalyst system of molecular-weight adjusting sensitivity is adopted in the course of the polymerization process.By selecting the combination of different catalysts component, promotor and external electron donor, polymerisation catalyst system is made to become more responsive to molecular weight regulator (hydrogen is the molecular weight regulator the most often adopted), deposit in case at a small amount of hydrogen, the polymeric articles of high MFR can be obtained.

Adopt controllable rheology technology to produce high MFR polymkeric substance, namely in polymkeric substance, add a small amount of peroxide degradation agent, not only can increase the manufacturing cost of product, goods also can be caused to produce niff, thus limit its range of application.In addition, in controllable rheology technology, first the polymer segment of high molecular often ruptures, thus molecular weight distribution is narrowed.

The method that raising hydrogen usage produces high MFR polymeric articles also has significant limitation.On the one hand, due to device pressure design, limit the add-on of hydrogen; On the other hand, hydrogen usage is excessive also can bring following problem: catalyst activity significantly reduces; Polymkeric substance degree of isotacticity declines, and end article rigidity declines; Further, in the polymerization technique using liquid propene heat radiation, in polymerization system, the existence of a large amount of hydrogen (hydrogen is a kind of non-condensable gas) makes propylene condensation difficulty, and directly load is produced in impact, causes production capacity to decline.

In a word, aforementioned production method is difficult to prepare simultaneously and both has the wide olefin polymer of high melt flow rate (MFR), high isotactic, simultaneously molecular weight distribution.But when production injection moulding homopolymer or anti-impact polymkeric substance, often wish that polymkeric substance had both had high melt flow rate (MFR) and high degree of isotacticity, have wide molecular weight distribution simultaneously.This polymkeric substance is considered to intensity that existing good processing characteristics also had and rigidity.

Therefore, need to provide a kind of method can preparing the olefin polymer simultaneously with high melt flow rate (MFR), high isotactic and wide molecular weight distribution.

Summary of the invention

The object of the invention is the shortcoming in order to overcome prior art, providing preparation method and the polymkeric substance thereof of olefin polymer.

To achieve these goals, the invention provides a kind of preparation method of olefin polymer, the method comprises, under the existence of olefin polymerization catalysis, by general formula CH ₂the alkene that=CHR represents carries out polyreaction, described olefin polymerization catalysis contains catalyst solid constituent A, organo-aluminium compound B and silicoorganic compound C, described catalyst solid constituent A contains magnesium, titanium, halogen, internal electron donor a and internal electron donor b, and the weight ratio of described internal electron donor a and described internal electron donor b is for being less than 1:1, wherein, described internal electron donor a and described internal electron donor b meets the following conditions: at polymerizing condition, when organo-aluminium compound B is identical with silicoorganic compound C during polypropylene, by the catalyst solid constituent A0 being only described internal electron donor a containing internal electron donor, the polyacrylic melt flow rate (MFR) MFR11 that the polymerization catalyst that described organo-aluminium compound B and described silicoorganic compound C form obtains with by the catalyst solid constituent B0 being only described internal electron donor b containing internal electron donor, the polyacrylic melt flow rate (MFR) MFR21 that the polymerization catalyst that described organo-aluminium compound B and described silicoorganic compound C forms obtains meets the temperature of described polyreaction is 85-130 DEG C.

Present invention also offers the polyolefine obtained by method provided by the invention, wherein, this polyolefine is polypropylene, and polyacrylic melt flow rate (MFR) MFR is more than 45g/10min, M _z+1/ Mn is more than 45, and isotactic index II is more than 94.5%.

Olefin polymerization catalysis provided by the invention when carrying out high temperature olefinic polyreaction, can be had the olefin polymer of high melt flow rate (MFR), high isotactic and wide molecular weight distribution simultaneously.Specific two kinds of internal electron donor a and b are selected in olefin polymerization catalysis provided by the invention, and under specific amount ratio, and condition under, more can be conducive to the olefin polymer simultaneously with high melt flow rate (MFR), high isotactic and wide molecular weight distribution.

In addition, in described olefin polymerization catalysis provided by the invention application in olefin polymerization, the high temperature polymerization of pre-complexing and prepolymerization technology is had can be more conducive to being polymerized the olefin polymer simultaneously with high melt flow rate (MFR), high isotactic and wide molecular weight distribution.

Other features and advantages of the present invention are described in detail in embodiment part subsequently.

Embodiment

Below the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.

The invention provides a kind of preparation method of olefin polymer, the method comprises, under the existence of olefin polymerization catalysis, by general formula CH ₂the alkene that=CHR represents carries out polyreaction, described olefin polymerization catalysis contains catalyst solid constituent A, organo-aluminium compound B and silicoorganic compound C, described catalyst solid constituent A contains magnesium, titanium, halogen, internal electron donor a and internal electron donor b, and the weight ratio of described internal electron donor a and described internal electron donor b is for being less than 1:1, wherein, described internal electron donor a and described internal electron donor b meets the following conditions: at polymerizing condition, when organo-aluminium compound B is identical with silicoorganic compound C during polypropylene, by the catalyst solid constituent A0 being only described internal electron donor a containing internal electron donor, the polyacrylic melt flow rate (MFR) MFR11 that the polymerization catalyst that described organo-aluminium compound B and described silicoorganic compound C form obtains with by the catalyst solid constituent B0 being only described internal electron donor b containing internal electron donor, the polyacrylic melt flow rate (MFR) MFR21 that the polymerization catalyst that described organo-aluminium compound B and described silicoorganic compound C forms obtains meets the temperature of described polyreaction is 85-130 DEG C, preferably, the temperature of described polyreaction is 85-110 DEG C, is more preferably 85-95 DEG C.

According to the present invention, the internal electron donor a contained in described catalyst solid constituent and internal electron donor b can have specific weight ratio, is more conducive to obtaining having the high melt flow rate (MFR) olefin polymer that molecular weight distribution is wide again.Under preferable case, the weight ratio of described internal electron donor a and described internal electron donor b is 0.05-0.43:1.

According to the present invention, form the catalyst solid constituent A0 only containing internal electron donor a.With the olefin polymerization catalysis polypropylene containing catalyst solid constituent A0, the polyacrylic melt flow rate (MFR) of gained is MFR11; The size of MFR11 value depends on the number of the hydrogen usage as chain-transfer agent.

Form the catalyst solid constituent B0 only containing internal electron donor b.With the olefin polymerization catalysis polypropylene containing catalyst solid constituent B0, the polyacrylic melt flow rate (MFR) of gained is MFR21; The size of MFR21 value depends on the number of the hydrogen usage as chain-transfer agent.

Prepare high melt flow rate (MFR) and the wide polymkeric substance of molecular weight distribution, in described catalyst solid constituent, electron donor compound a and b also need to meet the following conditions: be polymerized when identical hydrogen amount, preferably $\frac{\mathrm{MFR}21}{\mathrm{MFR}11}>5,$ Most preferably $\frac{\mathrm{MFR}21}{\mathrm{MFR}11}>10.$

Being appreciated that the polymkeric substance of the active centre polymerization preparation for being formed by internal electron donor a has low melt flow rate (MFR) like this, becoming the high molecular weight moieties in polymkeric substance; And the polymkeric substance of the active centre polymerization preparation that internal electron donor b is formed has high melt flow rate (MFR), become the low molecular weight part in polymkeric substance.Thus give final polymeric articles wide molecular weight distribution, there is higher melt flow rate (MFR) simultaneously.

In the present invention, can first select described internal electron donor a for insensitive especially to external electron donor response, described internal electron donor b is responsive especially to external electron donor response.Can select according to following methods:

For well known in the art, when dicyclopentyl dimethoxyl silane uses as external electron donor, the melt flow rate (MFR) that under the same terms, the polymkeric substance tool of gained is lower, namely insensitive especially to the hydrogen as chain-transfer agent; Tetraethoxysilane is as then contrary during external electron donor, and under the same terms, the polymkeric substance of gained has extra high melt flow rate (MFR), namely responsive especially to hydrogen.

Described internal electron donor a refers to external electron donor response is insensitive especially: Above-mentioned catalytic agent solid ingredient A0, under identical specific aggregation condition and polymerization procedure, use dicyclopentyl dimethoxyl silane as the melt flow rate (MFR) MFR12 of resulting polymers during external electron donor, with the ratio using tetraethoxysilane as the melt flow rate (MFR) MFR13 of resulting polymers during external electron donor be $\frac{\mathrm{MFR}13}{\mathrm{MFR}12}<4.$

Described internal electron donor b responds sensitivity especially to external electron donor and refers to: containing catalyst solid constituent B0 in olefin polymerization catalysis, under identical specific aggregation condition and polymerization procedure, use dicyclopentyl dimethoxyl silane as the melt flow rate (MFR) MFR22 of resulting polymers during external electron donor, with the ratio using tetraethoxysilane as the melt flow rate (MFR) MFR23 of resulting polymers during external electron donor be $\frac{\mathrm{MFR}23}{\mathrm{MFR}22}\&GreaterEqual;4.$

Specific aggregation condition comprises: in 5L polymeric kettle, carry out bulk propylene polymerization.Polymerization temperature is 70 DEG C, and hydrogen/propylene ratio is 7.3 × 10 ^-3mol/mol, promotor is organo-aluminium compound B, as the silicoorganic compound of external electron donor; Organo-aluminium compound/silicoorganic compound=25mol/mol; Ti=500mol/mol in silicoorganic compound/catalyst solid constituent; The polyacrylic melt flow rate (MFR) of being polymerized and obtaining is measured in accordance with GB/T3682-2000.

More specifically: the 5 liters of autoclave gas-phase propenes being connected with catalyst feeder, propylene and hydrogen feed line are fully replaced.In catalyst feeder, add the hexane solution (concentration of triethyl aluminum is 0.5mol/L) of 5mL triethyl aluminum, the hexane solution (concentration is 0.1mol/L) of 1mL silicoorganic compound, 10mL anhydrous n-hexane and catalyst solid constituent (make wherein in the mol ratio of the titanium content of titanium elements and triethyl aluminum for 500:1) under room temperature, after mixing 2 minutes (pre-complexing), join autoclave.Close autoclave, introduce the liquid propene that 4.0 standards rise hydrogen and 2.0L; In under agitation 20 minutes, temperature is risen to 70 DEG C.At 70 DEG C, polyreaction is after 1 hour, stops stirring, and removes unpolymerized propylene monomer, collects the polymkeric substance obtained.

Concrete internal electron donor a and the evaluation of internal electron donor b and chosen process are shown in specification sheets embodiment of the present invention.

According to the present invention, each component contained in described catalyst solid constituent content can there is no particular limitation, can be conducive to carrying out olefinic polymerization and obtain high melt flow rate (MFR) and the wide olefin polymer of molecular weight distribution.Under preferable case, with the gross weight of described catalyst solid constituent for benchmark, in described catalyst solid constituent, in the titanium content of titanium elements be 1-8 % by weight, in the Mg content of magnesium elements be 10-70 % by weight, in the content of halogen of halogens for 20-85 % by weight, the content of the total amount of described internal electron donor a and internal electron donor b is 2-30 % by weight; Preferably, with the gross weight of described catalyst solid constituent for benchmark, in described catalyst solid constituent, in the titanium content of titanium elements be 1.6-6 % by weight, in the Mg content of magnesium elements be 15-40 % by weight, in the content of halogen of halogens for 30-80 % by weight, the content of the total amount of described internal electron donor a and internal electron donor b is 3-20 % by weight.

According to the present invention, under preferable case, described internal electron donor a can be at least one in compound shown in compound and formula (III) shown in compound, formula (II) shown in formula (I);

In formula (I): R ₁and R ₂identical or not identical, and be the alkyl of hydrogen or C1-C14 straight or branched, C3-C10 cycloalkyl, C6-C10 aryl, C7-C10 alkaryl or C7-C10 aralkyl independently of one another; R ₃and R ₄identical or not identical, and be the alkyl of C1-C10 straight or branched, C3-C10 cycloalkyl, C6-C20 aryl, C7-C20 alkaryl or C7-C20 aralkyl independently of one another;

In formula (II): R ₅and R ₆identical or not identical, and be the alkyl of C1-C10 straight or branched, C3-C10 cycloalkyl, C6-C20 aryl, C7-C20 alkaryl or C7-C20 aralkyl independently of one another, optionally containing heteroatoms; R ₇-R ₁₀identical or not identical, and be the alkyl of hydrogen or C1-C14 straight or branched, C2-C14 alkylene, C3-C10 cycloalkyl, C6-C10 aryl, C7-C10 alkaryl or C7-C10 aralkyl independently of one another; Work as R ₇-R ₉when being all hydrogen simultaneously, R ₁₀be selected from the secondary alkyl of the uncle position branching of C3-C20, tertiary alkyl, cycloalkyl, aryl, arylalkyl or alkylaryl;

In formula (III): R ₁₁and R ₁₂identical or not identical, and be selected from halogen, the C1-C20 alkyl of substituted or unsubstituted straight or branched, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 alkaryl, C7-C20 aralkyl, C2-C10 alkylene or C10-C20 fused ring aryl independently of one another; R ₁₃-R ₁₈identical or not identical, and be selected from hydrogen, halogen, the C1-C20 alkyl of substituted or unsubstituted straight or branched, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 alkaryl, C7-C20 aralkyl, C2-C10 alkylene or C10-C20 fused ring aryl independently of one another, or optionally R ₁₃-R ₁₈in at least two link up into ring.

In the present invention, preferably, shown in formula (I), compound can be selected from following at least one: 2,3-di-isopropyl-2-cyano group dimethyl succinate, 2,3-di-isopropyl-2-cyano group diethyl succinate, 2,3-di-isopropyl-2-cyano group succinic acid di-n-propyl ester, 2,3-di-isopropyl-2-cyano group diisopropyl ester amber acid, 2,3-di-isopropyl-2-cyano group succinic acid di-n-butyl, 2,3-di-isopropyl-2-cyano group succinic acid diisobutyl ester, 2,3-di-isopropyl-2-cyano group succinic acid-1-methyl esters-4-ethyl ester (R ₁=methyl, R ₂=ethyl), 2,3-di-isopropyl-2-cyano group succinic acid-1-ethyl ester-4-methyl esters (R ₁=ethyl, R ₂=methyl), the positive butyl ester of 2,3-di-isopropyl-2-cyano group succinic acid-1--4-ethyl ester (R ₁=normal-butyl, R ₂=ethyl), the positive butyl ester (R of 2,3-di-isopropyl-2-cyano group succinic acid-1-ethyl ester-4- ₁=ethyl, R ₂=normal-butyl), 2,3-diisobutyl-2-cyano group dimethyl succinate, 2,3-diisobutyl-2-cyano group diethyl succinate, 2,3-diisobutyl-2-cyano group succinic acid di-n-propyl ester, 2,3-diisobutyl-2-cyano group diisopropyl ester amber acid, 2,3-diisobutyl-2-cyano group succinic acid di-n-butyl, 2,3-diisobutyl-2-cyano group succinic acid diisobutyl esters, 2,3-diisobutyl-2-cyano group succinic acid-1-methyl esters-4-ethyl ester (R ₁=methyl, R ₂=ethyl), 2,3-diisobutyl-2-cyano group succinic acid-1-ethyl ester-4-methyl esters (R ₁=ethyl, R ₂=methyl), the positive butyl ester of 2,3-diisobutyl-2-cyano group succinic acid-1--4-ethyl ester (R ₁=normal-butyl, R ₂=ethyl), the positive butyl ester (R of 2,3-diisobutyl-2-cyano group succinic acid-1-ethyl ester-4- ₁=ethyl, R ₂=normal-butyl), 2,3-di-sec-butyl-2-cyano group dimethyl succinate, 2,3-di-sec-butyl-2-cyano group diethyl succinate, 2,3-di-sec-butyl-2-cyano group succinic acid di-n-propyl ester, 2,3-di-sec-butyl-2-cyano group diisopropyl ester amber acid, 2,3-di-sec-butyl-2-cyano group succinic acid di-n-butyl, 2,3-di-sec-butyl-2-cyano group succinic acid diisobutyl esters, 2,3-di-sec-butyl-2-cyano group succinic acid-1-methyl esters-4-ethyl ester (R ₁=methyl, R ₂=ethyl), 2,3-di-sec-butyl-2-cyano group succinic acid-1-ethyl ester-4-methyl esters (R ₁=ethyl, R ₂=methyl), the positive butyl ester of 2,3-di-sec-butyl-2-cyano group succinic acid-1--4-ethyl ester (R ₁=normal-butyl, R ₂=ethyl), the positive butyl ester (R of 2,3-di-sec-butyl-2-cyano group succinic acid-1-ethyl ester-4- ₁=ethyl, R ₂=normal-butyl), 2,3-bicyclopentyl-2-cyano group dimethyl succinate, 2,3-bicyclopentyl-2-cyano group diethyl succinate, 2,3-bicyclopentyl-2-cyano group succinic acid di-n-propyl ester, 2,3-bicyclopentyl-2-cyano group diisopropyl ester amber acid, 2,3-bicyclopentyl-2-cyano group succinic acid di-n-butyl, 2,3-bicyclopentyl-2-cyano group succinic acid diisobutyl esters, 2,3-bicyclopentyl-2-cyano group succinic acid-1-methyl esters-4-ethyl ester (R ₁=methyl, R ₂=ethyl), 2,3-bicyclopentyl-2-cyano group succinic acid-1-ethyl ester-4-methyl esters (R ₁=ethyl, R ₂=methyl), the positive butyl ester of 2,3-bicyclopentyl-2-cyano group succinic acid-1--4-ethyl ester (R ₁=normal-butyl, R ₂=ethyl), the positive butyl ester (R of 2,3-bicyclopentyl-2-cyano group succinic acid-1-ethyl ester-4- ₁=ethyl, R ₂=normal-butyl), 2,3-dicyclohexyl-2-cyano group dimethyl succinate, 2,3-dicyclohexyl-2-cyano group diethyl succinate, 2,3-dicyclohexyl-2-cyano group succinic acid di-n-propyl ester, 2,3-dicyclohexyl-2-cyano group diisopropyl ester amber acid, 2,3-dicyclohexyl-2-cyano group succinic acid di-n-butyl, 2,3-dicyclohexyl-2-cyano group succinic acid diisobutyl esters, 2,3-dicyclohexyl-2-cyano group succinic acid-1-methyl esters-4-ethyl ester (R ₁=methyl, R ₂=ethyl), 2,3-dicyclohexyl-2-cyano group succinic acid-1-ethyl ester-4-methyl esters (R ₁=ethyl, R ₂=methyl), the positive butyl ester of 2,3-dicyclohexyl-2-cyano group succinic acid-1--4-ethyl ester (R ₁=normal-butyl, R ₂=ethyl), the positive butyl ester (R of 2,3-dicyclohexyl-2-cyano group succinic acid-1-ethyl ester-4- ₁=ethyl, R ₂=normal-butyl).Wherein, preferably 2,3-di-isopropyl-2-cyano group diethyl succinate, 2,3-di-isopropyl-2-cyano group succinic acid di-n-propyl ester, 2,3-di-isopropyl-2-cyano group diisopropyl ester amber acid, 2,3-di-isopropyl-2-cyano group succinic acid di-n-butyl, 2,3-di-isopropyl-2-cyano group succinic acid diisobutyl esters.Preferred 2,3-di-isopropyl-2-cyano group diethyl succinates especially.

In the present invention, preferably, compound shown in formula (II) can be selected from following at least one: two (2-ethyl-butyl) the succsinic acid diethyl ester of 2,3-, 2,3-diethyl-2-sec.-propyl succsinic acid diethyl ester, 2,3-di-isopropyl succsinic acid diethyl ester, 2,3-di-t-butyl succsinic acid diethyl ester, 2,3-diisobutyl succsinic acid diethyl ester, 2,3-(two trimethyl silyl) succsinic acid diethyl ester, 2-(3,3,3,3-trifluoro propyl)-3-methylsuccinic acid diethyl ester, 2,3-di neo-pentyl succsinic acid diethyl ester, 2,3-diisoamyl succsinic acid diethyl ester, 2,3-(1-trifluoromethyl-ethyl) succsinic acid diethyl ester, 2-sec.-propyl-3-isobutyl-succsinic acid diethyl ester, the 2-tertiary butyl-3-sec.-propyl succsinic acid diethyl ester, 2-sec.-propyl-3-cyclohexyl succsinic acid diethyl ester, 2-isopentyl-3-cyclohexyl succsinic acid diethyl ester, 2,2,3,3-methylsuccinic acid diethyl ester, 2,2,3,3-tetraethyl-succsinic acid diethyl ester, 2,2,3,3-tetrapropyl succsinic acid diethyl ester, 2,3-diethyl-2,3-di-isopropyl disuccinic acid diethyl ester, two (2-ethyl-butyl) the succsinic acid diisobutyl ester of 2,3-, 2,3-diethyl-2-sec.-propyl di-iso-octyl succinate, 2,3-di-isopropyl di-iso-octyl succinate, 2,3-di-t-butyl succsinic acid diisobutyl ester, 2,3-diisobutyl succsinic acid diisobutyl ester, 2,3-(two trimethyl silyl) succsinic acid diisobutyl ester, 2-(3,3,3,3-trifluoro propyl)-3-methylsuccinic acid diisobutyl ester, 2,3-di neo-pentyl succsinic acid diisobutyl ester, 2,3-diisoamyl succsinic acid diisobutyl ester, 2,3-(1-trifluoromethyl-ethyl) succsinic acid diisobutyl ester, 2-sec.-propyl-3-isobutyl-succsinic acid diisobutyl ester, the 2-tertiary butyl-3-sec.-propyl succsinic acid diisobutyl ester, 2-sec.-propyl-3-cyclohexyl succsinic acid diisobutyl ester, 2-isopentyl-3-cyclohexyl succsinic acid diisobutyl ester, 2,2,3,3-methylsuccinic acid diisobutyl ester, 2,2,3,3-tetraethyl-succsinic acid diisobutyl ester, 2,2,3,3-tetrapropyl succsinic acid diisobutyl ester, 2,3-diethyl-2,3-di-isopropyl disuccinic acid diisobutyl ester.Particularly preferably 2,3-di-isopropyl succsinic acid diethyl ester.

In the present invention, preferably, compound shown in formula (III) can be selected from following at least one: 2-sec.-propyl-2-isopentyl-1,3 propylene glycol dibenzoate, 2,4-glycol dibenzoate, 3-methyl-2,4-glycol dibenzoate, 3-ethyl-2,4-glycol dibenzoate, 2,2-dimethyl-2,4-glycol dibenzoate, 3,5-heptanediol dibenzoate, 4-methyl-3,5-heptanediol dibenzoate, 4-ethyl-3,5-heptanediol dibenzoate.Particularly preferably 2,4-glycol dibenzoate, 3, at least one in 5 heptanediol dibenzoates and 4-ethyl-3,5 heptanediol dibenzoate.

According to the present invention, under preferable case, described internal electron donor b can be compound shown in formula (IV),

In formula (IV): R ₁₉and R ₂₀identical or not identical, and be the one in the alkyl of C1-C12 straight or branched, C3-C10 cycloalkyl and C6-C20 alkaryl, replacement or non-substituted arene base independently of one another; R ₂₁-R ₂₄be all hydrogen, or wherein three be hydrogen, another one is the one in halogen, the alkyl of C1-C4 straight or branched and the alkoxyl group of C1-C4 straight or branched.

In the present invention, preferably, described internal electron donor b can be at least one in diethyl phthalate, n-butyl phthalate, diisobutyl phthalate, dihexyl phthalate, diheptyl phthalate and dimixo-octyl phthalate.

According to the present invention, described catalyst solid constituent A is the reaction product of titanium compound, magnesium compound, internal electron donor a and internal electron donor b.

In the present invention, under preferable case, described magnesium compound can at least one in the alcohol adducts of the magnesium compound shown in the hydrate of the magnesium compound shown in the magnesium compound shown in formula (VIII), formula (VIII) and formula (VIII),

MgR ⁴r ⁵formula (VIII)

In formula (VIII), R ⁴and R ⁵can be the one in halogen, the straight or branched alkoxyl group of C1-C8 and the straight or branched alkyl of C1-C8 independently of one another.

In the present invention, the hydrate of the magnesium compound shown in formula (VIII) refers to MgR ⁴r ⁵pH ₂o, wherein, p is 0.1-6, is preferably 2-3.5.In the present invention, the alcohol adducts of the magnesium compound shown in formula (VIII) refers to MgR ⁴r ⁵qR ⁶oH, wherein, R ⁶for the alkyl of C1-C18, be preferably the alkyl of C1-C8, be more preferably methyl, ethyl, n-propyl and sec.-propyl; Q is 0.1-6, is preferably 2-3.5.

Preferably, described magnesium compound can be dimethoxy magnesium, diethoxy magnesium, dipropoxy magnesium, diisopropoxy magnesium, dibutoxy magnesium, two isobutoxy magnesium, two pentyloxy magnesium, two oxygen base magnesium, two (2-ethyl) oxygen base magnesium, methoxyl group magnesium chloride, methoxyl group magnesium bromide, methoxyl group magnesium iodide, oxyethyl group magnesium chloride, oxyethyl group magnesium bromide, oxyethyl group magnesium iodide, propoxy-magnesium chloride, propoxy-magnesium bromide, propoxy-magnesium iodide, butoxy magnesium chloride, butoxy magnesium bromide, butoxy magnesium iodide, methylmagnesium-chloride, ethylmagnesium chloride, propyl group magnesium chloride, butylmagnesium chloride, amyl group magnesium chloride, phenyl-magnesium-chloride, magnesium dichloride, dibrominated magnesium, diiodinating magnesium, the alcohol adducts of magnesium dichloride, at least one in the alcohol adducts of dibrominated magnesium and the alcohol adducts of diiodinating magnesium.Most preferably, described magnesium compound contains at least one in diethoxy magnesium, butylmagnesium chloride, oxyethyl group magnesium chloride and magnesium dichloride.

In the present invention, described titanium compound can be compound shown in formula (IX),

TiX _m(OR ⁷) _4-mformula (IX)

In formula (IX), X is halogen, R ⁷for the alkyl of C1-C20, m is the integer of 0-4.Described halogen can be chlorine, bromine or iodine.

Preferably, in formula (IX), X is halogen, R ⁷for the alkyl of C1-C5, described titanium compound can be such as: at least one in titanium tetrachloride, titanium tetrabromide, titanium tetra iodide, four titanium butoxide, purity titanium tetraethoxide, a chlorine triethoxy titanium, dichlorodiethyl oxygen base titanium and trichlorine one ethanolato-titanium.Most preferably, described titanium compound is titanium tetrachloride.

In the present invention, described catalyst solid constituent A can be undertaken by the method preparing alkene catalyst component of this area routine.Such as prepare catalyst solid constituent of the present invention by one of following method.

1) method one: alkoxyl magnesium or Alkoxymagnesium halides are suspended in inert diluent and form suspension, then this suspension is mixed with above-mentioned titanium compound, internal electron donor a with b contact to obtain solids dispersion system, be commonly referred to mother liquor.Filtered by mother liquor, gained solid matter is suspended in the solution containing titanium tetrachloride and carries out contact pairs, is commonly referred to titanium process; Then after filtration, washing can obtain catalyst solid constituent of the present invention.

As the object lesson of above-mentioned alkoxyl magnesium, dimethoxy magnesium, diethoxy magnesium, dipropoxy magnesium, diisopropoxy magnesium, dibutoxy magnesium, two isobutoxy magnesium, two pentyloxy magnesium, two hexyloxy magnesium, two (2-ethyl) hexyloxy magnesium etc. or its mixture can be enumerated, be preferably the mixture of diethoxy magnesium or diethoxy magnesium and other alkoxyl magnesium.The preparation method of this alkoxyl magnesium compound, can be prepared by method well known in the art, MAGNESIUM METAL and fatty alcohol is prepared under a small amount of iodine exists disclosed in patent CN101906017A.

As the object lesson of above-mentioned Alkoxymagnesium halides, methoxyl group magnesium chloride, oxyethyl group magnesium chloride, propoxy-magnesium chloride, butoxy magnesium chloride etc. can be enumerated, preferred oxyethyl group magnesium chloride.The preparation method of this alkoxy magnesium compound, can be prepared by method well known in the art, prepares oxyethyl group magnesium chloride as Grignard reagent butylmagnesium chloride mixed with purity titanium tetraethoxide and tetraethoxy-silicane.

The inert diluent that in aforesaid method one, the formation of mother liquor uses can adopt at least one in hexane, heptane, octane, decane, benzene, toluene and dimethylbenzene.

The consumption of each composition that the formation of mother liquor uses in method one, in every mole of magnesium elements, the usage quantity 0.5-100 mole of titanium compound, is preferably 1-50 mole; The usage quantity of inert diluent is generally 0.5-100 mole, is preferably 1-50 mole; The total amount of interior electron donor(ED) a and b is generally 0.005-10 mole, is preferably 0.01-1 mole.

In method one, during the formation of mother liquor, the Contact Temperature of described each component is generally-40 DEG C to 200 DEG C, is preferably-20 DEG C to 150 DEG C; Be generally 1 minute-20 hours duration of contact, be preferably 5 minutes-8 hours.

In titanium treating processes described in method one, use alternative in the solution containing titanium tetrachloride to add inert diluent, as at least one in hexane, heptane, octane, decane, benzene, toluene and dimethylbenzene.

In method one in titanium treating processes, use consumption containing each composition in titanium tetrachloride solution, in every mole of magnesium elements, the usage quantity 0.5-100 mole of titanium compound, is preferably 1-50 mole; The usage quantity of inert diluent is generally 0-100 mole, is preferably 0-50 mole.

In method one, titanium number of processes is 0-10 time, preferred 1-5 time.

In method one in titanium treating processes, alternative adds above-mentioned interior electron donor(ED) a and b, and wherein total consumption of internal electron donor a and b is generally 0.005-10 mole, is preferably 0.01-1 mole.

In method one, titanium treatment temp is generally 0-200 DEG C, is preferably 30-150 DEG C; Be generally 1 minute-20 hours duration of contact, be preferably 5 minutes-6 hours.

2) method two: magnesium dihalide is dissolved in the solvent system that organic epoxy compound thing, organo phosphorous compounds, aliphatic alcohols compound and inert diluent form, with above-mentioned titanium compound, internal electron donor a and b contact reacts after formation homogeneous solution, under precipitation additive exists, separate out solids, form mother liquor; Filtered by mother liquor, gained solid matter is suspended in the solution containing titanium tetrachloride and carries out contact pairs, is below commonly referred to as titanium process; Then after filtration, washing can obtain catalyst solid constituent of the present invention.

The precipitation additive used in method two is not particularly limited, as long as it is shaping that solid particulate can be made to separate out.Adducible example has: at least one in organic acid anhydride, organic acid, ester, ether and ketone.The object lesson of described organic acid anhydride can be diacetyl oxide, Tetra hydro Phthalic anhydride, at least one in Succinic anhydried and MALEIC ANHYDRIDE etc., described organic acid object lesson can be acetic acid, propionic acid, butyric acid, at least one in vinylformic acid and methacrylic acid etc., the object lesson of described ester can be dibutyl phthalate, 2, 4-glycol dibenzoate, 3-ethyl-2, 4-glycol dibenzoate, 2, 3-di-isopropyl-1, 4-butyleneglycol dibenzoate, 3, 5-heptanediol dibenzoate and 4-ethyl-3, at least one in 5-heptanediol dibenzoate, the object lesson of described ether can be methyl ether, ether, propyl ether, butyl ether, amyl ether, 2-sec.-propyl-2-isopentyl Propanal dimethyl acetal and 9, at least one in 9-(dimethoxy methyl) fluorenes, described ketone can be acetone, at least one in methylethylketone and benzophenone.

The organic epoxy compound thing used in method two can for being selected from least one in oxyethane, propylene oxide, butylene oxide ring, butadiene oxide, butadiene double oxide, epoxy chloropropane, methyl glycidyl ether and diglycidylether etc., preferred epoxy chloropropane.

The organo phosphorous compounds used in method two can be hydrocarbyl carbonate or the halo hydrocarbyl carbonate of ortho-phosphoric acid or phosphorous acid, the object lesson of this organo phosphorous compounds can be enumerated: ortho-phosphoric acid trimethyl, ortho-phosphoric acid triethyl, ortho-phosphoric acid tri-n-butyl, ortho-phosphoric acid triphenylmethyl methacrylate, trimethyl phosphite, triethyl-phosphite, tributyl phosphate or phosphorous acid benzene methyl etc., preferred ortho-phosphoric acid tri-n-butyl.

The aliphatic alcohols compound used in method two can be straight or branched alkane unitary or the multi-alcohol of C1-C20, the straight or branched unitary fatty alcohol of preferred C1-C10, object lesson can be enumerated: methyl alcohol, ethanol, propyl alcohol, Virahol, butanols, isopropylcarbinol, amylalcohol, hexanol, enanthol, (2-ethyl) hexyl alcohol, octanol, nonyl alcohol, decyl alcohol etc., preferably (2-ethyl) hexyl alcohol.

The inert diluent that mother liquor uses in being formed in method two can adopt at least one in hexane, heptane, octane, decane, benzene, toluene and dimethylbenzene.

In method two, mother liquor forms the consumption of each composition of middle use, and in every mole of magnesium halide element, organic epoxy compound thing can be 0.2-10 mole, is preferably 0.5-4 mole; Organo phosphorous compounds can be 0.1-3 mole, is preferably 0.3-1.5 mole; Fat alcohol compound can be 0.2-10 mole, is preferably 0.5-3 mole; Titanium compound can be 0.5-20 mole, is preferably 5-15 mole; Helping and separating out component to be 0.01-0.3 mole, is preferably 0.02-0.2 mole; Total consumption of interior electron donor(ED) a and b can be 0-10 mole, is preferably 0.02-0.3 mole.

In method two, during the formation of mother liquor, the Contact Temperature of described each component is generally-40 DEG C to 200 DEG C, is preferably-20 DEG C to 150 DEG C; Be generally 1 minute-20 hours duration of contact, be preferably 5 minutes-8 hours.

In the treating processes of titanium described in method two, use alternative in the solution containing titanium tetrachloride to add inert diluent, as at least one in hexane, heptane, octane, decane, benzene, toluene and dimethylbenzene.

In method two in titanium treating processes, use consumption containing each composition in titanium tetrachloride solution, in every mole of magnesium elements, the usage quantity 0.5-100 mole of titanium compound, is preferably 1-50 mole; The usage quantity of inert diluent is generally 0-100 mole, is preferably 0-50 mole.

In method two, titanium number of processes is 0-10 time, preferred 1-5 time.

In method two in titanium treating processes, alternative adds above-mentioned interior electron donor(ED) a and b, and wherein total consumption of internal electron donor a and b is generally 0.005-10 mole, is preferably 0.01-1 mole.

In method two, titanium treatment temp is generally 0-00 DEG C, is preferably 30-150 DEG C; Be generally 1 minute-20 hours duration of contact, be preferably 5 minutes-6 hours.

3) method three: the alcohol adducts of magnesium dihalide is suspended in inert diluent and forms suspension, then this suspension is mixed with above-mentioned titanium compound, internal electron donor a with b contact to obtain solids dispersion system, be below commonly referred to as mother liquor.Filtered by mother liquor, gained solid matter is suspended in the solution containing titanium tetrachloride and carries out contact pairs, is below commonly referred to as titanium process; Then after filtration, washing can obtain catalyst solid constituent of the present invention.

The alcohol adducts of magnesium dihalide described in aforesaid method three can obtain by the following method: under not miscible with adducts inert solvent (as hexane, heptane, octane, decane, benzene, toluene and dimethylbenzene etc.) exists, alcohol (as methyl alcohol, ethanol, propyl alcohol or Virahol etc.) and magnesium halide are mixed to form emulsion, make the rapid chilling dispersion of this emulsion, gained spheroidal particle is the alcohol adducts of magnesium dihalide.

The inert diluent that in aforesaid method three, the formation of mother liquor uses can adopt at least one in hexane, heptane, octane, decane, benzene, toluene and dimethylbenzene.

The consumption of each composition that the formation of mother liquor uses in method three, in every mole of magnesium elements, the usage quantity 0.5-100 mole of titanium compound, is preferably 1-50 mole; The usage quantity of inert diluent is generally 0.5-100 mole, is preferably 1-50 mole; The total amount of interior electron donor(ED) a and b is generally 0.005-10 mole, is preferably 0.01-1 mole.

In method three, during the formation of mother liquor, the Contact Temperature of described each component is generally-40 DEG C to 200 DEG C, is preferably-20 DEG C to 150 DEG C; Be generally 1 minute-20 hours duration of contact, be preferably 5 minutes-8 hours.

In titanium treating processes described in method three, use alternative in the solution containing titanium tetrachloride to add inert diluent, as at least one in hexane, heptane, octane, decane, benzene, toluene and dimethylbenzene.

In method three in titanium treating processes, use consumption containing each composition in titanium tetrachloride solution, in every mole of magnesium elements, the usage quantity 0.5-100 mole of titanium compound, is preferably 1-50 mole; The usage quantity of inert diluent is generally 0-100 mole, is preferably 0-50 mole.

In method three, titanium number of processes is 0-10 time, preferred 1-5 time.

In method three in titanium treating processes, alternative adds above-mentioned interior electron donor(ED) a and b, and wherein total consumption of internal electron donor a and b is generally 0.005-10 mole, is preferably 0.01-1 mole.

In method three, titanium treatment temp is generally 0-200 DEG C, is preferably 30-150 DEG C; Be generally 1 minute-20 hours duration of contact, be preferably 5 minutes-6 hours.

According to the present invention, under preferable case, in the aluminium element in described organo-aluminium compound B and described silicoorganic compound C, the mol ratio Al/Si of element silicon is 0.1-500:1; Preferably, Al/Si is 1-300:1; More preferably, Al/Si is 3-100:1.

According to the present invention, under preferable case, the mol ratio Al/Ti of the titanium elements in the aluminium element in described organo-aluminium compound B and described catalyst solid constituent A is 5-5000:1; Preferably, Al/Ti is 20-1000:1; More preferably, Al/Ti is 50-500:1.

According to the present invention, described organo-aluminium compound B can be the various organo-aluminium compounds that can be used as the promotor of Ziegler-natta catalyst conventional in field of olefin polymerisation.Under preferable case, described organo-aluminium compound B can be compound shown in formula (VI),

AlR' _yx' _3-yformula V

In formula V, R' can be hydrogen, the alkyl of C1-C20 or the aryl of C6-C20, and X' is halogen, and y is the integer of 1-3.

Preferably, described organo-aluminium compound B can be selected from least one in following compound: trimethyl aluminium, triethyl aluminum, triisobutyl aluminium, trioctylaluminum, a hydrogen diethyl aluminum, a hydrogen diisobutyl aluminum, aluminium diethyl monochloride, a chloro-di-isobutyl aluminum, sesquialter ethylmercury chloride aluminium or ethyl aluminum dichloride; Be more preferably triethyl aluminum and/or triisobutyl aluminium.

According to the present invention, described silicoorganic compound C is silicon-containing compound shown in formula (VI) and/or the shown aminosilane of formula (VII),

R ¹" _{m "}r ²" _{n "}si (OR ³") _{4-m "-n "}formula (VI)

Wherein, R ¹" and R ²" for identical or different, and be selected from the one in following functional group independently of one another: halogen, hydrogen atom, C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl or C1-C20 haloalkyl; R ³" be selected from the one in following functional group: C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl or C1-C20 haloalkyl; M " and n " is respectively the integer of 0-3, and m "+n " <4;

R ¹" ' _{m " '}si (N R ²" ' R ³" ') _{n " '}(OR ⁴" ') _{4-m " '-n " '}formula (VII)

Wherein, R ¹one in the following functional group of " ' be selected from: halogen, hydrogen atom, C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl or C1-C20 haloalkyl; R ²" ' and R ³" ' for identical or different, and be selected from the one in following functional group independently of one another: hydrogen atom, C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl or C1-C20 haloalkyl; R ⁴one in the following functional group of " ' be selected from: C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl or C1-C20 haloalkyl; The integer that m " ' be the integer of 0-3, n " ' is 1-3.

Preferably, the silicon-containing compound shown in formula (VI) is selected from least one in following compound: trimethylmethoxysilane, diisopropyl dimethoxy silane, second, isobutyl dimethoxy silane, isopropyl butyldimethoxysilane, di-t-butyl dimethoxysilane, tertbutyl methyl dimethoxysilane, t-butylethyl dimethoxysilane, tertiary butyl propyldimethoxy-silane, ter /-butylisopropyl dimethoxysilane, Cyclohexyl Methyl Dimethoxysilane, Dicyclohexyldimethoxysilane, cyclohexyl-t-butyldimethoxysilane, cyclopentyl-methyl dimethoxysilane, cyclopentyl ethyl dimethoxysilane, dicyclopentyl dimethoxyl silane, cyclopentyl cyclohexyl dimethoxysilane, two (2-methylcyclopentyl) dimethoxysilane, dimethoxydiphenylsilane, diphenyl diethoxy silane, phenyl triethoxysilane, methyltrimethoxy silane, Union carbide A-162, ethyl trimethoxy silane, propyl trimethoxy silicane, propyl-triethoxysilicane, isopropyltri-methoxysilane, isopro-pyltriethoxysilane, butyl trimethoxy silane, butyl triethoxyl silane, trimethoxysilane, isobutyl triethoxy silane, amyltrimethoxysilane, isopentyl Trimethoxy silane, cyclopentyl-trimethoxy-silane, cyclohexyl trimethoxy silane, dimethoxydiphenylsilane, diphenyl diethoxy silane, phenyltrimethoxysila,e, phenyl triethoxysilane, vinyltrimethoxy silane, vinyltriethoxysilane, tetramethoxy-silicane, tetraethoxysilane or four butoxy silanes,

More preferably, the silicon-containing compound shown in formula (VI) is selected from least one in following compound: dicyclopentyl dimethoxyl silane, diisopropyl dimethoxy silane, second, isobutyl dimethoxy silane, Cyclohexyl Methyl Dimethoxysilane, dimethoxydiphenylsilane, methyl-t-butyldimethoxysilane, propyl-triethoxysilicane, isobutyl triethoxy silane or tetraethoxysilane.Particularly preferably the silicon-containing compound shown in formula (VI) is selected from least one in following compound: propyl-triethoxysilicane, isobutyl triethoxy silane or tetraethoxysilane.

Preferably, amino silane compounds shown in formula (VII) is selected from least one in following compound: diethylamino triethoxyl silane, two (diethylamino) diisoamyl silane, two (trans-perhydro quinolyl) dimethoxysilane, two (the cis-quinolyl that is all-trans) dimethoxysilane, two (ethylamino) bicyclopentyl silane; Particularly preferably diethylamino triethoxyl silane.

According to silicoorganic compound C of the present invention, can be that above-mentioned silicoorganic compound C is used alone, also can be two or more above-mentioned silicoorganic compound C compound use.

In the present invention, a kind of preferred implementation, the temperature of described polyreaction is 85-95 DEG C, described olefin polymerization catalysis contains catalyst solid constituent A, organo-aluminium compound B and silicoorganic compound C, wherein, described silicoorganic compound C is n-propyl triethoxyl silane, diisopropyl dimethoxy silane, at least one in diethylamino triethoxyl silane and second, isobutyl dimethoxy silane, described internal electron donor a is 2, 3-di-isopropyl-2-cyano group diethyl succinate, 2, 3-di-isopropyl succsinic acid diethyl ester, 2, 4-glycol dibenzoate, 3, 5-heptanediol dibenzoate and 4-ethyl-3, at least one in 5-heptanediol dibenzoate, described internal electron donor b is diethyl phthalate, n-butyl phthalate, diisobutyl phthalate, dihexyl phthalate, at least one in diheptyl phthalate and dimixo-octyl phthalate, and, the weight ratio of described internal electron donor a and described internal electron donor b is 0.05-0.43:1, the mol ratio of the aluminium in described organo-aluminium compound B and described silicoorganic compound C is 3-100:1, and the mol ratio of the titanium in the aluminium in described organo-aluminium compound B and described catalyst solid constituent A is 50-500:1.Obtain when more can be conducive to being polymerized the alkene that general formula CH2=CHR represents and there is high melt flow rate (MFR), high isotactic, the olefin polymer that molecular weight distribution is wide simultaneously.

According to the present invention, described olefin polymerization process can comprise makes one or more alkene contact with olefin polymerization catalysis provided by the invention, and at least one in described alkene is by general formula CH ₂the alkene that=CHR represents, wherein, R can be the alkyl of hydrogen or C1-C6; Preferably, described alkene can be selected from following at least one: ethene, propylene, 1-n-butene, the positive amylene of 1-, 1-n-hexylene, the positive octene of 1-and 4-methyl-1-pentene; More preferably, described alkene can be selected from least one in ethene, propylene and 1-butylene.

All polymerizations of described alkene can be carried out in the present invention, also can carry out the copolymerization of described alkene.

Improve polymeric reaction temperature in certain limit, can improve the hydrogen response of catalyzer, namely during identical hydrogen usage, the melt flow rate (MFR) of polymkeric substance increases, and this is conducive to preparing high melt-flow-rate-polymer of the present invention.In addition, improve polymeric reaction temperature within the specific limits, polymkeric substance degree of isotacticity also can increase, and is conducive to polymkeric substance and obtains good rigidity.But polymeric reaction temperature can not significantly raise; For catalyst solid constituent of the present invention, when polymerization temperature is elevated to after more than 95 DEG C, although catalyzer hydrogen response improves further, polymerization activity declines to a great extent, and polymkeric substance isotactic index also starts to present downtrending.Therefore, according to application of the present invention, the temperature of described olefin polymerization process is 85-130 DEG C, is preferably 85-110 DEG C, is more preferably 85-95 DEG C.

Except polymerization temperature, other condition of olefin polymerization process of the present invention can be polymerization time is 0.1-5 hour, and pressure is 0.01-10MPa.Preferably the time is 0.5-4 hour, and pressure is 0.5-5MPa.The consumption of described olefin polymerization catalysis can be the consumption of the catalyzer of prior art.

In the present invention, described method can also comprise olefin polymerization catalysis each component of the present invention, namely catalyst solid constituent A of the present invention, organo-aluminium compound B and silicoorganic compound C first carried out pre-contact or pre-complexing before contacting olefinic monomer, and then contacted with olefinic monomer and carry out polyreaction.The time of pre-contact is 0.1-30min, preferred 1-10 minute; The temperature of pre-contact is-20 DEG C to 80 DEG C, preferably 10 DEG C-50 DEG C.

In the present invention, first described application can also comprise carries out prepolymerization by olefin polymerization catalysis of the present invention and obtains pre-polymerized catalyst under the existence of a small amount of olefinic monomer, then is contacted with olefinic monomer further by pre-polymerized catalyst and react.

Described prepolymerization contributes to the raising etc. of polymerization catalyst activity and polymer bulk density.According to application of the present invention, described prepolymerization can be adopted, also can not adopt described prepolymerization.

The described prepolymerization of preferred employing.Described prepolymerized multiplying power, can adopt by when carrying out prepolymerization, the charging capacity of monomer and olefin polymerization catalysis provided by the invention is calculated as polymkeric substance (as polypropylene PP) with the mass ratio of catalyzer is 2-3000gPP/gCat, preferred 3-2000gPP/gCat; Prepolymerized temperature is-20-80 DEG C, preferred 10-50 DEG C.

In the present invention, a kind of preferred implementation, the application of described olefin polymerization catalysis in olefin polymerization process, can comprise pre-complexing, prepolymerization and olefinic polymerization.

Present invention also offers the polyolefine obtained by method provided by the invention, this polyolefine is polypropylene, and polyacrylic melt flow rate (MFR) MFR is more than 45g/10min, M _z+1/ Mn is more than 45, and isotactic index II is more than 94.5%; Preferably, melt flow rate (MFR) MFR is 60-120g/10min, M _z+1/ Mn is 60-80, and isotactic index II is 95.5-97%.

In the present invention, the molecular weight distribution of gel permeation chromatography (GPC) characterize polymers that this area routine can be used to use.Characterize with GPC, the weight-average molecular weight Mw of polymkeric substance, number-average molecular weight Mn, Z-average molecular weight M can be obtained _zand M _z+1.Usually represent the molecular weight distribution of polymkeric substance with Mw/Mn, its value is larger, and molecular weight distribution is wider.Because number-average molecular weight is comparatively responsive to small molecular mass moieties, and Z-average molecular weight is comparatively responsive to macromolecule part, for special catalyst system of the present invention, adopts M _z+1/ Mn can better reflect the advantage of polymkeric substance in wide molecular weight distribution prepared by olefin polymerization catalysis provided by the invention.

Below will be described the present invention by embodiment.

Test in following examples and evaluation are carried out by the following method:

1) measured by 721 spectrophotometers (An Hemeng (Tianjin) development in science and technology company limited) in the titanium content of titanium elements in catalyst solid constituent;

2) melt flow rate (MFR) (melting index) of polymkeric substance is that the model of use purchased from the new experimental instrument and equipment company limited in Changchun is for XRZ-00 fusion index instrument is according to the method mensuration specified in GB/T3682-2000;

3) Malvern Mastersizer ^tM2000 normal hexane dispersion agent laser diffractometries measure grain size, size-grade distribution (wherein, the SPAN=(D90-D10)/D50 of alkoxyl magnesium and catalyzer).

4) in olefin polymerization catalyst components, internal electron donor content uses Waters600E liquid chromatography to carry out measuring or Agilent7890 gas Chromatographic Determination.

5) molecular weight distribution MWD(MWD=Mw/Mn) measuring method comprise: adopt PL-GPC220 be that solvent carries out measuring (standard specimen: polystyrene at 150 DEG C with trichlorobenzene, flow velocity: 1.0ml/min, pillar: 3xPlgel10um MlxED-B300x7.5nm).

6) testing method of polymkeric substance degree of isotacticity comprises: 2 grams of dry polymer samples, is placed in extractor and after 6 hours, residuum is dried to constant weight, by following formulae discovery degree of isotacticity with the extracting of boiling heptane:

Polymer quality/2 × 100 after degree of isotacticity (%)=extracting.

Preparation example 1

This preparation example is for illustration of preparing alkoxyl magnesium carrier.

After fully replacing the 16L voltage-resistant reactor with agitator with nitrogen, in reactor, add 10L ethanol, 300mL2-ethylhexanol, 11.2g iodine, 8g magnesium chloride and 640g magnesium powder.Stir makes system be warming up to 75 DEG C of back flow reaction simultaneously, till no longer including hydrogen discharge.Stopped reaction, uses 3L washing with alcohol, and filtration, drying, obtain alkoxyl magnesium carrier a1.Gained alkoxyl magnesium carrier D50=30.2um, Span value 0.81.

Preparation example 2

This preparation example is for illustration of Kaolinite Preparation of Catalyst solid ingredient A0.

Get 650g alkoxyl magnesium carrier a1, toluene 3250mL and 2-cyano group-2,3-di-isopropyl diethyl succinate (the preparation method's preparation with reference in CN101811983A) 72mL and be mixed with suspension.Repeating through high pure nitrogen, in the withstand voltage reactor of 16L of replacing, to add toluene 2600mL and titanium tetrachloride 3900mL, be warming up to 80 DEG C.Then add in still by the suspension prepared, constant temperature 1 hour, then in reactor, add 2-cyano group-2,3-di-isopropyl diethyl succinate 108mL, be slowly warming up to 110 DEG C, constant temperature 2 hours, press filtration obtains solid substance.The mixed solution that gained solid substance adds toluene 5070mL and titanium tetrachloride 3380mL 110 DEG C of stir process 1 hour, so process 3 times.Press filtration, the solid of gained hexanes wash 4 times, each 6000mL, press filtration, drying, obtain catalyst solid constituent A0.Be 3.2 % by weight, 2-cyano group-2,3-di-isopropyl diethyl succinate content in the titanium content of titanium elements in gained catalyst solid constituent A0 be 7.9 % by weight.

Preparation example 3

This preparation example is for illustration of Kaolinite Preparation of Catalyst solid ingredient B0.

According to the method for preparation example 2, unlike, " 2-cyano group-2,3-di-isopropyl diethyl succinate " is changed into " n-butyl phthalate ".

Be 2.7 % by weight in the titanium content of titanium elements in gained catalyst solid constituent B0, n-butyl phthalate content is 10.8 % by weight.

Preparation example 4

This preparation example is for illustration of Kaolinite Preparation of Catalyst solid ingredient A1.

According to the method for preparation example 2, unlike, " 2-cyano group-2,3-di-isopropyl diethyl succinate " is changed into " 3,5-heptanediol dibenzoates (with reference to preparation method's preparation in CN1213080C) ".

Be 3.8 % by weight, 3,5-heptanediol dibenzoic acid ester contents in the titanium content of titanium elements in gained catalyst solid constituent A1 be 7.5 % by weight.

Preparation example 5

This preparation example is for illustration of Kaolinite Preparation of Catalyst solid ingredient A2.

According to the method for preparation example 2, unlike, " 2-cyano group-2,3-di-isopropyl diethyl succinate " is replaced with " 2-sec.-propyl-2-isopentyl-1,3-Propanal dimethyl acetal (with reference to preparation method's preparation in CN1036846C) ".

In gained catalyst solid constituent A2, titanium atom content is 2.5 % by weight, 2-sec.-propyl-2-isopentyl-1,3-Propanal dimethyl acetal content is 13.4 % by weight.

Evaluation Example

This evaluation Example is for illustration of the evaluation of internal electron donor a, b and selection.

The 5 liters of autoclave gas-phase propenes being connected with catalyst feeder, propylene and hydrogen feed line are fully replaced.In catalyst feeder, add the hexane solution (concentration of triethyl aluminum is 0.5mol/L) of 5mL triethyl aluminum, the hexane solution (concentration is 0.1mol/L) of 1mL silicoorganic compound, 10mL anhydrous hexane and catalyst solid constituent (make wherein in the mol ratio of the titanium content of titanium elements and triethyl aluminum for 500:1) under room temperature, after mixing 2 minutes (pre-complexing), join autoclave.Close autoclave, introduce the liquid propene that 4.0 standards rise hydrogen and 2.0L; In under agitation 20 minutes, temperature is risen to 70 DEG C.At 70 DEG C, polyreaction is after 1 hour, stops stirring, and removes unpolymerized propylene monomer, collects and obtains polymer P.

Catalyst solid constituent A0, A1, A2, B0 polymerization activity when different silicoorganic compound C, melt flow rate (MFR), polymkeric substance degree of isotacticity (II) are in table 1.Wherein the polymerization activity of catalyzer is calculated by following formula:

Polymerization activity=polymer P quality (kilogram)/catalyst solid constituent quality (g)

Table 1

The polymkeric substance MFR of different catalysts solid ingredient in table 1 when using DCPDMS and TEOS carried out calculating catalyst solid constituent A0, A1, A2 value and catalyst solid constituent B0 value, can reflect that catalyzer containing different internal electron donor a or b is to the responding ability of external electron donor (i.e. silicoorganic compound), specifically in table 2.

Table 2

From data in table 1 and table 2, catalyst solid constituent A0, A1, A2 are insensitive especially to external electron donor response, namely and catalyst solid constituent B0 is responsive especially to external electron donor response, namely namely in A0, A1, A2 internal electron donor a used be 2-cyano group-2,3-di-isopropyl diethyl succinate, 3,5-heptanediol dibenzoates, 2-sec.-propyl-2-isopentyl-1,3-Propanal dimethyl acetal to external electron donor response insensitive; And the internal electron donor b used in B0 is for dibutyl phthalate is to external electron donor response sensitivity.Therefore, 2-cyano group-2,3-di-isopropyl diethyl succinate, 3,5-heptanediol dibenzoates, 2-sec.-propyl-2-isopentyl-1,3-Propanal dimethyl acetal meet the condition as electron donor a in catalyst solid constituent of the present invention; N-butyl phthalate then meets the condition as electron donor b in catalyst solid constituent of the present invention.

In addition, be it can also be seen that by data in table 1 and table 2, all use n-PTES when making external electron donor, the MFR11(evaluation Example 3 of A0) with the MFR21(evaluation Example 11 of B0) ratio be 11.6, meet condition, then 2-cyano group-2, the 3-di-isopropyl diethyl succinate used in A0 can be used as the internal electron donor a in the present invention, and the n-butyl phthalate in B0 can be used as the internal electron donor b in the present invention.But, the MFR11(evaluation Example 8 of A2 under the same conditions) be 46.4, the ratio of the MFR21 of itself and B0 is 2.3, does not meet do not meet condition, therefore 2-sec.-propyl-2-isopentyl-1,3-Propanal dimethyl acetal can not be used as the internal electron donor a in the present invention.

Preparation example 6-7 is for illustration of the catalyst solid constituent using internal electron donor a and b determined by above-mentioned evaluation Example to prepare.

Preparation example 6

This preparation example is for illustration of Kaolinite Preparation of Catalyst solid ingredient A11.

Get 650g alkoxyl magnesium carrier a1, toluene 3250mL and 2-cyano group-2,3-di-isopropyl diethyl succinate 32mL is mixed with suspension.Repeating in the withstand voltage reactor of 16L of replacing through high pure nitrogen, add toluene 2600mL and titanium tetrachloride 3900mL, be warming up to 80 DEG C, then the suspension prepared is added in still, constant temperature 1 hour, then n-butyl phthalate 148mL is added in reactor, be slowly warming up to 110 DEG C, constant temperature 2 hours, press filtration obtains solid substance.The mixed solution that gained solid substance adds toluene 5070mL and titanium tetrachloride 3380mL 110 DEG C of stir process 1 hour, so process 3 times.Press filtration, the solid of gained hexanes wash 4 times, each 6000mL, press filtration, drying, obtain catalyst solid constituent A11.Be 3.3 % by weight, 2-cyano group-2,3-di-isopropyl diethyl succinate content in the titanium atom content of titanium elements in gained catalyst solid constituent A11 be 1.1 % by weight, n-butyl phthalate content is 6.7 % by weight.

Preparation example 7

This preparation example is for illustration of Kaolinite Preparation of Catalyst solid ingredient A12.

Repeating in the reactor of replacing through High Purity Nitrogen, add 52.5mmol Magnesium Chloride Anhydrous, 328mmol toluene and 140mmol2-ethylhexanol successively, under mixing speed 450rpm, temperature are the condition of 110 DEG C, react 3.0 hours, obtain the alcohol adduct solution of stable and uniform; Add 3,5-heptanediol dibenzoate 0.8mmol, diisobutyl phthalate 5.6mmol and tetrabutyl titanate 2.2mmol again, stir 60 minutes, be cooled to room temperature, obtain mixture.

Said mixture is joined in the reactor of 1.0mol titanium tetrachloride and the 190mmol toluene of fully replacing, being equipped with-20 DEG C through nitrogen, them are made fully to contact at-20 DEG C by stirring, after 5 hours, be warming up to 110 DEG C, separate out solid precipitation in temperature-rise period, then add diisobutyl phthalate 5.6mmol, react 1 hour, after reaction terminates, filter out liquid and obtain solid; The solid obtained is contacted 1 hour with 680mmol toluene and 437mmol titanium tetrachloride at 110 DEG C, repeats again after filtration to react once with this Solids At Low Temperatures at 110 DEG C with 680mmol toluene and 437mmol titanium tetrachloride.By the solids 919mmol hexanes wash that obtains 5 times, then dry, obtain catalyst solid constituent A12.Be 2.2 % by weight, 3,5-heptanediol dibenzoic acid ester contents in the titanium content of titanium elements in this catalyst solid constituent A12 be 2.1 % by weight, diisobutyl phthalate content is 9.1 % by weight.

The olefin polymerization catalysis that following examples 1-6 is prepared for illustration of catalyst solid constituent A11 and A12 selecting preparation example 6-7 to obtain prepares polyacrylic method.

Embodiment 1

The 3.5 liters of autoclave gas-phase propenes being connected with catalyst feeder, propylene and hydrogen feed line are fully replaced.Introduce the liquid propene that 4.0 standards rise hydrogen and 2.0L.Add respectively in autoclave under room temperature the hexane solution (concentration of triethyl aluminum is 0.5mol/L) of 5mL triethyl aluminum, the hexane solution (concentration of n-PTES is 0.1mol/L) of 1mL n-propyl triethoxyl silane (n-PTES), 10mL anhydrous hexane and catalyst solid constituent A11(make wherein in the mol ratio of the titanium content of titanium elements and triethyl aluminum for 500:1), 300mL propylene rinses catalyst addition tube line.Close autoclave, at room temperature stir 5 minutes (being equivalent to pre-polymerization); In under agitation 20 minutes, temperature is risen to 85 DEG C.At 85 DEG C, polyreaction is after 1 hour, stops stirring, and removes unpolymerized propylene monomer, collects and obtains polymer P.

Calculate polymerization activity, melt flow rate (MFR), polymkeric substance degree of isotacticity (II) and polymer bulk density (BD), molecular weight distribution, result is as shown in table 3.

Embodiment 2

According to the method for embodiment 1, unlike, substitute " n-propyl triethoxyl silane (n-PTES) " with " di-isopropyl Trimethoxy silane/n-propyl triethoxyl silane (1/9mol/mol) ".Carry out propylene polymerization, collect the polymeric articles being polymerized and obtaining.

Calculate polymerization activity, melt flow rate (MFR), polymkeric substance degree of isotacticity (II) and polymer bulk density (BD), molecular weight distribution, result is as shown in table 3.

Embodiment 3

According to the method for embodiment 1, unlike, substitute " n-propyl triethoxyl silane " with " diethylamino triethoxyl silane (with reference to preparation method's preparation in CN100427513C) ", substitute " 4.1 standards of introducing rise hydrogen " with " 1.8 standards of introducing rise hydrogen ".Carry out propylene polymerization, collect the polymeric articles being polymerized and obtaining.

Calculate polymerization activity, melt flow rate (MFR), polymkeric substance degree of isotacticity (II) and polymer bulk density (BD), molecular weight distribution, result is as shown in table 3.

Comparative example 1

According to the method for embodiment 1, unlike, substitute " catalyst solid constituent A11 " with " catalyst solid constituent A0 ".Carry out propylene polymerization, collect the polymeric articles being polymerized and obtaining.

Calculate polymerization activity, melt flow rate (MFR), polymkeric substance degree of isotacticity (II) and polymer bulk density (BD), molecular weight distribution, result is as shown in table 3.

Comparative example 2

According to the method for embodiment 1, unlike, substitute " catalyst solid constituent A11 " with " catalyst solid constituent B0 ".Carry out propylene polymerization, collect the polymeric articles being polymerized and obtaining.

Calculate polymerization activity, melt flow rate (MFR), polymkeric substance degree of isotacticity (II) and polymer bulk density (BD), molecular weight distribution, result is as shown in table 3.

Embodiment 4

The 3.5 liters of autoclave gas-phase propenes being connected with catalyst feeder, propylene and hydrogen feed line are fully replaced.Add in catalyst feeder under room temperature the hexane solution (concentration of triethyl aluminum is 0.5mol/L) of 5mL triethyl aluminum, the hexane solution (concentration of DIPDMS is 0.1mol/L) of 1mL diisopropyl dimethoxy silane (DIPDMS), 10mL anhydrous hexane and catalyst solid constituent A12(make wherein in the mol ratio of the titanium content of titanium elements and promotor for 500:1), join autoclave after mixing 2 minutes (pre-complexing).Close autoclave, introduce the liquid propene that 4.0 standards rise hydrogen and 2.0L; At room temperature stir 5 minutes (being equivalent to pre-polymerization); In under agitation 20 minutes, temperature is risen to 95 DEG C.At 95 DEG C, polyreaction is after 1 hour, stops stirring, and removes unpolymerized propylene monomer, collects and obtains polymer P.

Calculate polymerization activity, melt flow rate (MFR), polymkeric substance degree of isotacticity (II) and polymer bulk density (BD), molecular weight distribution, result is as shown in table 3.

Embodiment 5

According to the method for embodiment 3, unlike, substitute " 1.8 standards rise hydrogen " with " 2.7 standards rise hydrogen ", substitute " diisopropyl dimethoxy silane " with " second, isobutyl dimethoxy silane ".Carry out propylene polymerization, collect the polymeric articles being polymerized and obtaining.

Calculate polymkeric substance.Polymerization activity, melt flow rate (MFR), polymkeric substance degree of isotacticity (II) and polymer bulk density (BD), molecular weight distribution, result is as shown in table 3.

Embodiment 6

According to the method for embodiment 3, unlike, substitute " diisopropyl dimethoxy silane " with " diisoamyl dimethoxysilane/tetraethoxysilane (1/9mol/mol) ".Carry out propylene polymerization, collect the polymeric articles being polymerized and obtaining.

Calculate polymerization activity, melt flow rate (MFR), polymkeric substance degree of isotacticity (II) and polymer bulk density (BD), molecular weight distribution, result is as shown in table 3.

Comparative example 3

According to the method for embodiment 1, unlike, substitute " catalyst solid constituent A11 " with " catalyst solid constituent A1 ".Carry out propylene polymerization, collect the polymeric articles being polymerized and obtaining.

Calculate polymerization activity, melt flow rate (MFR), polymkeric substance degree of isotacticity (II) and polymer bulk density (BD), molecular weight distribution, result is as shown in table 3.

Comparative example 4

According to the method for embodiment 1, unlike, substitute " catalyst solid constituent A11 " with " catalyst solid constituent A12 ", substitute " polymerization temperature 85 DEG C " with " polymerization temperature 70 DEG C ".Carry out propylene polymerization, collect the polymeric articles being polymerized and obtaining.

Calculate polymerization activity, melt flow rate (MFR), polymkeric substance degree of isotacticity (II) and polymer bulk density (BD), molecular weight distribution, result is as shown in table 3.

Comparative example 5

According to the method for comparative example 4, unlike, substitute " catalyst solid constituent A11 " with " catalyst solid constituent A12 "; Substitute " 1mL n-propyl triethoxyl silane (n-PTES) " with " 1mL diisopropyl dimethoxy silane ".Carry out propylene polymerization, collect the polymeric articles being polymerized and obtaining.

Calculate polymerization activity, melt flow rate (MFR), polymkeric substance degree of isotacticity (II) and polymer bulk density (BD), molecular weight distribution, result is as shown in table 3.

From table 3, adopt the preparation method of olefin polymer provided by the invention, can containing specific internal electron donor a and b and under the weight ratio of a:b be specific and the olefin polymerization catalysis of specific silicoorganic compound C exists, by general formula CH ₂the alkene that=CHR represents at high temperature is polymerized in single reactor, and preparation has high melt flow rate (MFR) (MFR>45g/10min), wide molecular weight distribution (M simultaneously _z+1/ Mn>45) and the polymeric articles of isotactic index high (>94.5%).And in comparative example 1-3, do not adopt specific olefin polymerization catalysis (only internal electron donor a or b), or polyreaction is not at high temperature carried out in comparative example 4-5, the polymeric articles then obtained there will be the deficiency of melt flow rate (MFR) (comparative example 1 and 5), molecular weight distribution (comparative example 2) or isotactic index (comparative example 3 and 4) aspect, namely can not obtain and there is high melt flow rate (MFR), wide molecular weight distribution simultaneously, and the polymeric articles that isotactic index is high.

Claims (14)

1. a preparation method for olefin polymer, the method comprises, under the existence of olefin polymerization catalysis, by general formula CH ₂the alkene that=CHR represents carries out polyreaction; Described olefin polymerization catalysis contains catalyst solid constituent A, organo-aluminium compound B and silicoorganic compound C; Described catalyst solid constituent A contains magnesium, titanium, halogen, internal electron donor a and internal electron donor b, and the weight ratio of described internal electron donor a and described internal electron donor b is for being less than 1:1;

Wherein, described internal electron donor a and described internal electron donor b meets the following conditions: at polymerizing condition, when organo-aluminium compound B is identical with silicoorganic compound C during polypropylene, by the catalyst solid constituent A0 being only described internal electron donor a containing internal electron donor, the polyacrylic melt flow rate (MFR) MFR11 that the polymerization catalyst that described organo-aluminium compound B and described silicoorganic compound C form obtains with by the catalyst solid constituent B0 being only described internal electron donor b containing internal electron donor, the polyacrylic melt flow rate (MFR) MFR21 that the polymerization catalyst that described organo-aluminium compound B and described silicoorganic compound C forms obtains meets

The temperature of described polyreaction is 85-130 DEG C.

2. method according to claim 1, wherein, the temperature of described polyreaction is 85-110 DEG C, is more preferably 85-95 DEG C.

3. method according to claim 1, wherein, the weight ratio of described internal electron donor a and described internal electron donor b is 0.05-0.43:1.

4. method according to claim 1, wherein,

5. method according to claim 1, wherein, the mol ratio of the element silicon in the aluminium element in described organo-aluminium compound B and described silicoorganic compound C is 0.1-500:1, and the mol ratio of the titanium elements in the aluminium element in described organo-aluminium compound B and described catalyst solid constituent A is 5-5000:1.

6. method according to claim 1, wherein, with the gross weight of described catalyst solid constituent A for benchmark, in described catalyst solid constituent A, in the titanium content of titanium elements be 1-8 % by weight, in the Mg content of magnesium elements be 10-70 % by weight, in the content of halogen of halogens for 20-85 % by weight, the content of the total amount of described internal electron donor a and internal electron donor b is 2-30 % by weight.

7. according to the method in claim 1-6 described in any one, wherein, described internal electron donor a is at least one in compound shown in compound and formula (III) shown in compound, formula (II) shown in formula (I), and described internal electron donor b is compound shown in formula (IV)

In formula (I): R ₁and R ₂identical or not identical, and be the alkyl of hydrogen or C1-C14 straight or branched, C3-C10 cycloalkyl, C6-C10 aryl, C7-C10 alkaryl or C7-C10 aralkyl independently of one another; R ₃and R ₄identical or not identical, and be the alkyl of C1-C10 straight or branched, C3-C10 cycloalkyl, C6-C20 aryl, C7-C20 alkaryl or C7-C20 aralkyl independently of one another;

In formula (II): R ₅and R ₆identical or not identical, and be the alkyl of C1-C10 straight or branched, C3-C10 cycloalkyl, C6-C20 aryl, C7-C20 alkaryl or C7-C20 aralkyl independently of one another, optionally containing heteroatoms; R ₇-R ₁₀identical or not identical, and be the alkyl of hydrogen or C1-C14 straight or branched, C2-C14 alkylene, C3-C10 cycloalkyl, C6-C10 aryl, C7-C10 alkaryl or C7-C10 aralkyl independently of one another; Work as R ₇-R ₉when being all hydrogen simultaneously, R ₁₀be selected from the secondary alkyl of the uncle position branching of C3-C20, tertiary alkyl, cycloalkyl, aryl, arylalkyl or alkylaryl;

In formula (III): R ₁₁and R ₁₂identical or not identical, and be selected from halogen, the C1-C20 alkyl of substituted or unsubstituted straight or branched, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 alkaryl, C7-C20 aralkyl, C2-C10 alkylene or C10-C20 fused ring aryl independently of one another; R ₁₃-R ₁₈identical or not identical, and be selected from hydrogen, halogen, the C1-C20 alkyl of substituted or unsubstituted straight or branched, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 alkaryl, C7-C20 aralkyl, C2-C10 alkylene or C10-C20 fused ring aryl independently of one another, or optionally R ₁₃-R ₁₈in at least two link up into ring;

In formula (IV): R ₁₉and R ₂₀identical or not identical, and be the one in the alkyl of C1-C12 straight or branched, C3-C10 cycloalkyl and C6-C20 alkaryl, replacement or non-substituted arene base independently of one another; R ₂₁-R ₂₄be all hydrogen, or wherein three be hydrogen, another one is the one in halogen, the alkyl of C1-C4 straight or branched and the alkoxyl group of C1-C4 straight or branched.

8. method according to claim 7, wherein, described internal electron donor a is 2,3-di-isopropyl-2-cyano group diethyl succinate, 2,3-di-isopropyl succsinic acid diethyl ester, 2, at least one in 4-glycol dibenzoate, 3,5-heptanediol dibenzoates and 4-ethyl-3,5-heptanediol dibenzoate.

9. method according to claim 7, wherein, described internal electron donor b is at least one in diethyl phthalate, n-butyl phthalate, diisobutyl phthalate, dihexyl phthalate, diheptyl phthalate and dimixo-octyl phthalate.

10. according to the method in claim 1-6 described in any one, wherein, described organo-aluminium compound B is compound shown in formula V,

AlR ' _yx ' _3-yformula V

In formula V, R ' is hydrogen, the alkyl of C1-C20 or the aryl of C2-C20, and X ' is halogen, and y is 1-3 integer.

11. methods according to claim 1, wherein, described silicoorganic compound C is silicon-containing compound shown in formula (VI) and/or the shown aminosilane of formula (VII),

R ¹" _{m "}r ²" _{n "}si (OR ³") _{4-m " -n "}formula (VI)

Wherein, R ¹" and R ²" for identical or different, and be selected from the one in following functional group independently of one another: halogen, hydrogen atom, C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl or C1-C20 haloalkyl; R ³" be selected from the one in following functional group: C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl or C1-C20 haloalkyl; M " and n " is respectively the integer of 0-3, and m "+n " <4;

R ¹" ' _{m " '}si (N R ²" ' R ³" ') _{n " '}(OR ⁴" ') _{4-m " ' -n " '}formula (VII)

Wherein, R ¹one in the following functional group of " ' be selected from: halogen, hydrogen atom, C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl or C1-C20 haloalkyl; R ²" ' and R ³" ' for identical or different, and be selected from the one in following functional group independently of one another: hydrogen atom, C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl or C1-C20 haloalkyl; R ⁴one in the following functional group of " ' be selected from: C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl or C1-C20 haloalkyl; The integer that m " ' be the integer of 0-3, n " ' is 1-3.

12. methods according to claim 1, wherein, described catalyst solid constituent is the reaction product of titanium compound, magnesium compound, internal electron donor a and internal electron donor b.

13. methods according to claim 1, wherein, the time of described polyreaction is 0.1-5 hour, and the pressure of described polyreaction is 0.01-10MPa.

14. polyolefine obtained by the method in claim 1-13 described in any one, it is characterized in that, this polyolefine is polypropylene, and polyacrylic melt flow rate (MFR) MFR is more than 45g/10min, M _z+1/ Mn is more than 45, and isotactic index II is more than 94.5%.