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CN106366431B - A kind of polypropene composition of high rigidity high tenacity - Google Patents

A kind of polypropene composition of high rigidity high tenacity Download PDF

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Publication number
CN106366431B
CN106366431B CN201510441682.4A CN201510441682A CN106366431B CN 106366431 B CN106366431 B CN 106366431B CN 201510441682 A CN201510441682 A CN 201510441682A CN 106366431 B CN106366431 B CN 106366431B
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component
group
carbon
polymerization
benzoyloxy
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CN106366431A (en
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张晓萌
宋文波
邹发生
胡慧杰
刘宣伯
邵静波
毕福勇
邵清
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Sinopec Beijing Research Institute of Chemical Industry
China Petroleum and Chemical Corp
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Sinopec Beijing Research Institute of Chemical Industry
China Petroleum and Chemical Corp
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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10Homopolymers or copolymers of propene
    • C08L23/12Polypropene
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F110/00Homopolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F110/02Ethene
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F110/00Homopolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F110/04Monomers containing three or four carbon atoms
    • C08F110/06Propene
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F210/00Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F210/16Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00Properties
    • C08L2201/08Stabilised against heat, light or radiation or oxydation
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00Polymer mixtures characterised by other features
    • C08L2205/03Polymer mixtures characterised by other features containing three or more polymers in a blend
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2314/00Polymer mixtures characterised by way of preparation
    • C08L2314/02Ziegler natta catalyst

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  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)

Abstract

The present invention provides a kind of polypropene composition with high rigidity and high tenacity, the composition include: the homopolypropylene of (a) 60-90 weight %, and the homopolypropylene is the high isotatic polypropylene of isotactic index >=97%;(b) ethylene-propylene copolymer of 5-20 weight %, the ethylene-propylene copolymer contain the ethylene of 30-60 weight %, and the intrinsic viscosity of room temperature xylene soluble part is 2-5dl/g;And (c) homopolymerisation polyethylene of 5-20 weight %;Wherein the intrinsic viscosity of component (c) is greater than 5dL/g.The present invention also provides the preparation methods of above-mentioned composition, by adjusting the composition of component (b) and the molecular weight of component (c), in the higher situation of molecular weight of crystallizable poly- second component, hence it is evident that improve the toughness of product, while keeping certain rigidity.

Description

A kind of polypropene composition of high rigidity high tenacity
Technical field
The present invention relates to the preparation methods of a kind of polypropene composition of high rigidity high tenacity and the composition.
Background technique
Polypropylene is one of with the fastest developing speed, the synthetic resin kind that dosage is maximum, purposes is most wide.With automobile, object The rapid development of the industries such as stream, there is an urgent need to the high-performance polypropylene compound materials of high bending modulus, high impact.
The toughening of high polymer and enhancing are the important topic of polymer material science always, and the purpose of enhancing is to improve mould Amount, the purpose of toughening is to improve impact strength, but the two is often conflicting, can not balance.The prior art is mostly by altogether Mixed method addition rubber and elastomer realize toughening, and realize enhancing by addition inorganic rigid particle, or carry out bullet Property body/inorganic rigid particle it is composite filled come and meanwhile realize the effect of activeness and quietness.But these method post-processing steps are complicated, Energy consumption is high.
Summary of the invention
An object of the present invention is to provide a kind of method of high strong and unyielding impact polypropylene of direct polymerization preparation, in homopolymerization On the basis of polyacrylic, elastomer is obtained by being copolymerized in the first gas-phase reactor, polymerization obtains in the second gas-phase reactor Poly- polyethylene, homopolymerisation polyethylene crystallization are contained inside rubber phase, and two phase compositions of control, content and molecular weight, Ke Yi are passed through Higher rigidity is kept while improving toughness.
Another object of the present invention is to provide the polypropene composition for the high rigidity high tenacity that the above method is prepared, It has the characteristics of high-modulus and high impact strength, can be used for producing automobile component, household items etc..
Specifically, the present invention uses ziegler-natta catalyzed system, continuously prepares in multi-step polymerization reaction high strong and unyielding poly- Propylene compositions, the continuous phase of acquired composition are the homopolypropylene of high stereoregularity, can keep product rigidity, Hardness and heat resistance.Dispersed phase is the copolymer of ethylene and propylene or other alpha-olefins with special composed structure, and packet Ensconce the crystallization homopolymerisation polyethylene inside aforementioned copolymer, that is, rubber phase.By the composition and homopolymerisation polyethylene that adjust rubber phase Molecular weight, in the higher situation of molecular weight of crystallizable poly- second component, hence it is evident that improve the toughness of product, while keeping centainly Rigidity.
Present invention eliminates the prior arts phase addition filler (to use be blended as mentioned in the background art after the reaction Method addition rubber and elastomer realize toughening, and by addition inorganic rigid particle realize enhancing) complicated process, drop Low energy consumption, solving the problems, such as that polypropene composition is strong and unyielding can not balance.
An object of the present invention is to provide a kind of polypropene composition with high rigidity and high tenacity, the composition Include:
(a) 60-90 weight %, the preferably homopolypropylene of 65-85 weight %, the homopolypropylene be isotactic index >= 97% high isotatic polypropylene;(b) 5-20 weight %, the preferably ethylene-propylene copolymer of 10-15 weight %, the ethylene- Propylene copolymer contains 30-60 weight %, the preferably ethylene of 30-50 weight %, and the intrinsic viscosity of room temperature xylene soluble part is 2-5dl/g;And (c) homopolymerisation polyethylene of 5-20 weight %.Wherein, the intrinsic viscosity of the component (c) is greater than 5dL/g.
The flexural modulus values of the polypropene composition are at least 1.4GPa, preferably higher than 1.5GPa;Izod notch shock (23 DEG C) numerical value is at least 16kJ/m2, preferably 20.0-60kJ/m2
According to the present invention, fusing point >=160 DEG C of the component (a), the fusing point of component (c) is between 120 DEG C -135 DEG C.Institute Stating component (a) is continuous phase, and component (b) and component (c) are dispersed phase, and component (c) crystallizes in component (b).
It is yet another object of the invention to provide the preparation methods of the polypropene composition, use Ziegler-Natta Catalyst is prepared with continuous polymerization.The method includes the polymerization reaction zone that at least three carry out in order, wherein group (a), (b) and (c) is divided to prepare in different polymerization reaction zones in order, in addition to first segment, other each sections are all poly- in leading portion It closes and is operated in the presence of reacting established polymer and catalyst used.
Specifically, propylene homo generate component (a) reaction at least carried out in a polymeric segment, then carry out ethylene with Propylene or other alpha-olefins generate the reaction of elastocopolymer, finally carry out the reaction that ethylene homo generates component (c).
In method of the invention, the Ziegler-Natta catalyst used is largely disclosed, wherein CN02100900.7 Described catalyst especially has advantage for the present invention.
The catalyst includes catalyst activity component, organo-aluminum compound and optional external electron donor.It is described to urge Agent active component includes titanium compound, magnesium compound and internal electron donor, and the internal electron donor is in the following general formula At least one polyester compound:
Wherein:
A, B be carbon or selected from nitrogen, oxygen, sulphur, boron hetero atom;
R1-R6、R1-RnGroup is the C of identical or different hydrogen, halogen or substituted or unsubstituted linear chain or branched chain1- C20Alkyl, naphthenic base, aryl, alkaryl, aralkyl, alkylene, fused ring aryl, ester group, R1And R2It is not hydrogen, R3-R6And R1-Rn It arbitrarily include substituent of one or several hetero atoms as carbon or hydrogen atom or both on group, the hetero atom is selected from Nitrogen, oxygen, sulphur, silicon, phosphorus or halogen atom, R3-R6And R1-RnOne or more of group can link up cyclization;
N is the integer of 0-10;
When A or B is oxygen or sulphur, the number of R group connected thereto is 0;When A or B is boron or nitrogen, connect thereon The number of the R group connect is 1;When A or B is carbon or silicon, the number of R group connected thereto is 2, and when A and B is It is bonded in the form of carbon-carbon single bond or double or triple bonds between A and B when carbon, when bonded in the form of carbon-carbon single bond between A and B, The number for the R group that A and B are separately connected is 2, when bonded in the form of carbon-carbon double bond between A and B, R group that A is connected with B Number 1, when bonded in the form of triple carbon-carbon bonds between A and B, the number 0 for the R group that A is connected with B.
In a specific embodiment of the present invention, the internal electron donor is selected from 9,9- bis- (benzoyloxy methyl) fluorenes, 9, Bis- (propylene carboxymethyl group) fluorenes of 9-, bis- (the third carboxymethyl group) fluorenes of 9,9-, bis- (cortex cinnamomi carboxymethyl group) fluorenes of 9,9-, 2- isopropyl -2- Bis- benzoyloxy propane of isopentyl -1,3-, bis- propylene carboxyl propane of 2- isopropyl -2- isopentyl -1,3-, 2- isopropyl -2- are different Amyl -1,3- dipropyl carboxyl propane, 1,2-, bis- benzoyloxy ethane, 1,3-, bis- benzoyloxy propane,-two benzoyloxy fourth of Isosorbide-5-Nitrae Alkane, ortho-xylene carboxyl benzene, bis- cortex cinnamomi carboxyl propane of 2- isopropyl -2- isopentyl -1,3-, four (benzoyloxy methyl) methane, 1,2,3- tri- benzoyloxy propane, 2,2,4- trimethyl -1,3-, bis- benzoyloxy pentane and 2,2- diisobutyl -1,3- hexichol first At least one of carboxyl propane.
As the organo-aluminum compound optimizing alkyl aluminium compound of cocatalyst component, more preferable trialkylaluminium and its derivative Object, such as: trimethyl aluminium, triethyl aluminum, triisobutyl aluminium, three n-butylaluminums, trioctylaluminum, aluminium diethyl monochloride, a chlorine two are different Butyl aluminium, aluminium diethyl monochloride, a chloro-di-isobutyl aluminum, one aluminium ethide of dichloro, ethyl aluminum dichloride etc..With Ti/Al weight ratio meter, The weight ratio of the active solid catalyst component and organo-aluminum compound cocatalyst component is 1: (10-500), preferably 1: (25-100)。
External electron donor as optional catalyst component is preferably organo-silicon compound, general formula RnSi(OR′)4-n, 0≤n≤3 in formula, R and R ' are alkyl, naphthenic base, aryl, halogenated alkyl etc. of the same race or not of the same race, R may be halogen or Hydrogen atom.It specifically may include but be not limited to tetramethoxy-silicane, tetraethoxysilane, trimethylmethoxysilane, trimethyl second Oxysilane, trimethyl phenoxysilane, dimethyldimethoxysil,ne, dimethyl diethoxysilane, methyl tertbutyl two Methoxy silane, isopropyl methyl dimethoxysilane, two phenoxy group dimethoxysilanes, diphenyl diethoxy silane, benzene Base trimethoxy silane, phenyl triethoxysilane, vinyltrimethoxysilane, Cyclohexyl Methyl Dimethoxysilane, two Cyclopenta dimethoxysilane, diisopropyl dimethoxy silane, second, isobutyl dimethoxy silane, 2- ethyl piperidine base -2- T-butyldimethoxysilane, (1,1,1- tri- fluoro- 2- propyl) -2- ethyl piperidine base dimethoxysilane and (1,1,1- tri- is fluoro- 2- propyl)-methyl dimethoxysilane etc..With Al/Si weight ratio meter, the alkyl aluminum compound and organo-silicon compound Weight ratio is (3-100): 1.
Three kinds of catalytic components can be added directly into polymer reactor, can also be known pre- by industry It complexing and/or prepolymerization and then is added in reactor.It can also be carried out optionally with or without the catalyst being complexed in advance Ground prepolymerization processing.Prepolymerization can be carried out continuously under the conditions of liquid-phase bulk, can also intermittently be carried out in atent solvent.Prepolymerization Reactor can be continuous stirred tank, annular-pipe reactor etc..Prepolymerized temperature control is between -10 to 60 DEG C, preferably Temperature is 0-40 DEG C.At 0.5-1000 times, preferred multiple is 1.0-500 times for prepolymerized multiple control.
The polymerization, which can be, to be carried out continuously, and also may be carried out batchwise.
The continuous polymerization can be used more than two tandem reactors and carry out.Wherein one or several reactor systems Standby component (a) of the present invention, the reactor for preparing the component (a) can be Liquid-phase reactor or gas-phase reactor, liquid Phase reaction device can be annular-pipe reactor or stirred tank reactor, and gas-phase reactor can be horizontal type agitated bed reactor or stand Formula agitated bed reactor or fluidized-bed reactor etc., the above Liquid-phase reactor and gas-phase reactor can also arbitrarily collocation groups It closes.It is used to prepare component (b) of the present invention preparing the subsequent reactor of the component (a), prepares the component (b) reactor is gas-phase reactor, and gas-phase reactor can be horizontal type agitated bed reactor, vertical mixing bed reactor or stream Fluidized bed reactor etc., the above gas-phase reactor can also arbitrarily matched combineds.Preparing the subsequent reactor of the component (b) For preparing component (c) of the present invention, the reactor for preparing the component (c) is gas-phase reactor, gas phase reaction Device can be horizontal type agitated bed reactor, vertical mixing bed reactor or fluidized-bed reactor etc., and the above gas-phase reactor can also With arbitrarily matched combined.
The batchwise polymerization can be sequentially prepared component of the present invention in single-reactor (such as tank reactor) (a), (b) and (c).It can be polymerize in liquid phase when wherein preparing component (a), can also be polymerize in gas phase.Preparation group Divide (b) and (c) need to be polymerize in gas phase.
For the polymerization reaction in liquid phase polymerization, polymerization temperature is 0-150 DEG C, preferably 40-100 DEG C;Polymerization pressure is answered Higher than saturated vapour pressure of the propylene under corresponding polymerization temperature.In gas-phase polymerization, polymerization temperature is 0-150 DEG C, preferably 40- 100℃;It is highly preferred that reaction temperature when preparation component (a) is 50-80 DEG C, and prepare component (b) and reaction temperature when (c) Degree is 70-100 DEG C.Polymerization pressure can be normal pressure or higher, and preferably pressure is 0.5-3.0MPa (gauge pressure, similarly hereinafter).Using hydrogen Gas produces the product of different melt index as molecular weight regulator.
The known thermo oxidative aging auxiliary agent of industry can be added in polypropene composition of the present invention and halogen absorption helps The known antistatic agent of industry, colorant, nucleating agent etc. can also be added to further increase the property of material in some aspects in agent Energy.
Polypropene composition of the present invention has both high-modulus and good impact resistance, can be used for producing automobile component With household items etc..
Detailed description of the invention
Fig. 1 is scanning electron microscope (SEM) figure of 4 gained polypropene composition of embodiment.
Fig. 2 is differential scanning calorimetry (DSC) figure of 4 gained polypropene composition of embodiment.
Specific embodiment
The present invention is further described below with reference to embodiment.The scope of the present invention is not restricted by the embodiments, this hair Bright range proposes in detail in the claims.
Data in embodiment are obtained according to following test method:
Melt mass flow rate (MFR): GB/T 3682-2000 standard test is pressed.
Isotactic index (II): GB/T 2412-2008 standard test is pressed;
Co-monomer content: it is measured with fourier infrared method.
Gas molar ratio in reactor: it is measured with gas chromatography.
Cold xylene solubles content: it is measured by ASTM D5492-98.
Bending modulus and bending strength: it is measured according to GB/T 9341-2008.
Tensile strength and elongation: it is measured according to GB/T 1040.2-2006.
Izod notched impact strength (23/-20 DEG C): it is measured according to GB/T 1843-2008.
Heat distortion temperature: it is measured according to GB/T 1634.2-2004.
Melting temperature (Tm): it is measured with the DSC7 type differential scanning calorimeter instrument of Perkin Elmer company, test scope From 50 DEG C to 200 DEG C.Sample is first risen to 200 DEG C by the speed of 10 DEG C/min to eliminate thermal history, then presses the speed of 10 DEG C/min Degree is down to 50 DEG C, measures its crystallization temperature and crystallization enthalpy, then rise to 200 DEG C by the speed of 10 DEG C/min, measures its fusing point and melts Melt enthalpy.
Intrinsic viscosity: it is measured according to ASTM D5225-98.Wherein component (a) and component (b) and final composition (a+b + c) intrinsic viscosity can directly be measured by instrument, the intrinsic viscosity of component (c) need to be calculated by the following formula to obtain: IVC component=[IVComposition-(IVA component* a constituent mass percentage composition %+IVB component* b constituent mass percentage composition %)]/c constituent mass Percentage composition %.
Above each test all carries out under the conditions of room temperature environment, unless otherwise indicated.
Embodiment 1
Polypropene composition in the present invention and embodiment obtains by the following method:
Major catalyst (active solid catalyst component) is recorded using embodiment 24 in Chinese patent CN02100900.7 Method obtains, and wherein Ti content is 2.5wt%, and polyester compound 9, bis- (benzoyloxy methyl) the fluorenes contents of 9- are 15.1wt%.
Polymerization reaction carries out on a set of polypropylene pilot-plant, polymerization and steps are as follows:
Pre-terminated touches prepolymerization
By the above-mentioned major catalyst being prepared, co-catalyst (triethyl aluminum) and external electron donor (methylcyclohexyl two Methoxy silane, CHMMS) at 10 DEG C pre-contact reaction 20min after, be added continuously prepolymerization reactor carry out prepolymerization it is anti- It answers.The addition rate of each raw material in pre-polymerization process are as follows: triethyl aluminum (TEA) flow is 6g/hr, methylcyclohexyl dimethoxy Silane (CHMMS) flow is 1.02g/hr, and major catalyst flow is 0.36g/hr.Prepolymerization under propylene liquid-phase bulk environment into Row, temperature are 15 DEG C, and the residence time is about 4min.
Polymerization reaction
Pre-polymerization rear catalyst is completed propylene homo in annular-pipe reactor and is closed instead continuously into liquid phase annular-pipe reactor It answers, prepares component (a).Polymeric reaction condition are as follows: liquid-phase polymerization temperature 70 C, reaction pressure 4.0MPa, ring canal reaction Hydrogen is added in the charging of device, the density of hydrogen of on-line chromatograph detection is 0.3mol%.
After annular-pipe reactor reaction, resulting material enters the copolymerization that first fluidized bed gas-phase reactor carries out ethylene and propylene Reaction is prepared component (b).Polymeric reaction condition are as follows: gas phase polymerization temperature is 75 DEG C, reaction pressure 0.8MPa, wherein Ethylene/(ethylene+propylene)=0.4 (volume ratio), gas-phase reactor charging in plus a certain amount of hydrogen, on-line chromatograph detect gas phase Density of hydrogen in reactor cycles gas is 0.3mol%.
After first gas-phase reactor, resulting material enters second fluidized bed gas-phase reactor and carries out ethylene homo reaction, system Standby component (c), obtains polypropene composition of the present invention.Polymeric reaction condition are as follows: gas phase polymerization temperature is 75 DEG C, Reaction pressure is 0.3MPa.Wherein ethylene/(ethylene+propylene) >=0.99 (volume ratio), gas-phase reactor charging in plus it is a certain amount of Hydrogen, on-line chromatograph detect gas-phase reactor circulating air in density of hydrogen be 0.4mol%.
The concrete technology condition of above-mentioned prepolymerization and polymerization reaction is shown in Table 1.
It reacts that obtained polymerizate is degassed, after wet nitrogen deactivation processing, is added 0.1wt%'s into powder 168 additive of IRGAFOS, 1010 additive of IRGANOX of 0.1wt%, the calcium stearate of 0.05wt% and 0.2wt% VP 101B nucleating agent, is granulated with double screw extruder.Injection molding machine prepares the injected sample for meeting GB standard, and tests its physics Property, test result are as shown in table 2.
Subordinate list and explanation
Table 1 is that embodiment and comparative example prepares the reaction condition of polypropene composition, and obtains polypropene composition Performance parameter;Table 2 is polypropene composition that embodiment and comparative example is prepared after being granulated and sample is made, and is surveyed Try obtained performance parameter.
Embodiment 2
Used catalyst, pre- complexing and polymerization process condition are substantially the same manner as Example 1, the difference is that: the Density of hydrogen in two gas-phase reactor is 0.2mol%, and concrete technology condition is shown in Table 1.
Embodiment 3
Used catalyst, pre- complexing and polymerization process condition are substantially the same manner as Example 1, the difference is that: the Reaction pressure in two gas-phase reactor is 0.6MPa, and concrete technology condition is shown in Table 1.
Embodiment 4
Used catalyst, pre- complexing and polymerization process condition are substantially the same manner as Example 1, the difference is that: the Density of hydrogen in two gas-phase reactor is 0.2mol%, reaction pressure 0.6MPa, and concrete technology condition is shown in Table 1, product Microscopic appearance is as shown in Figure 1, continuous phase therein is component (a), and the spherical discontinuous phase part of white is component (c), in component (c) component (b) of annular, component (c) crystallization in component (b) are wrapped in outside.The DSC melting curve of product as shown in Fig. 2, its There are two melting peak, the position between 160 DEG C and 120-135 DEG C respectively.Since polyacrylic fusing point is generally on 160 DEG C of left sides The right side, so melting peak as we know from the figure >=160 DEG C is the melting peak of component (a), the melting peak between 120-135 DEG C is component (c) melting peak.
Embodiment 5
Used catalyst, pre- complexing and polymerization process condition are substantially the same manner as Example 1, the difference is that: the The ethylene of one gas-phase reactor/(ethylene+propylene)=0.5 (volume ratio), density of hydrogen 0.4mol%, concrete technology condition are shown in Table 1.
Comparative example 1
Used catalyst, pre- complexing and polymerization process condition are substantially the same manner as Example 1, the difference is that: it is anti- The first gas-phase reactor should only be proceeded to, no longer carry out the second gas phase reaction, concrete technology condition is shown in Table 1.
Comparative example 2
Used catalyst, pre- complexing and polymerization process condition are substantially the same manner as Example 1, the difference is that: the Two gas-phase reactor continue to repeat the reaction in the first gas-phase reactor, do not produce homopolymerisation polyethylene, and are to continue with production second third Copolymer, concrete technology condition are shown in Table 1.
Comparative example 3
Used catalyst, pre- complexing and polymerization process condition are substantially the same manner as Example 1, the difference is that: the Density of hydrogen in two gas-phase reactor is 40mol%, reaction pressure 0.6MPa, and concrete technology condition is shown in Table 1.
Comparative example 4
Used catalyst, pre- complexing and polymerization process condition are substantially the same manner as Example 1, the difference is that: ring Density of hydrogen in pipe reactor is 0.5mol%, ethylene/(ethylene+propylene)=0.2 (volume ratio) in the first gas-phase reactor, Density of hydrogen is 0.2mol%, and the density of hydrogen in the second gas-phase reactor is 27%, and concrete technology condition is shown in Table 1.

Claims (10)

1. a kind of polypropene composition with high rigidity and high tenacity, the composition include:
(a) homopolypropylene of 67-68 weight %, the homopolypropylene are the polypropylene of isotactic index >=97%;
(b) ethylene-propylene copolymer of 12-14 weight %, the ethylene-propylene copolymer contain the ethylene of 30-60 weight %, room The intrinsic viscosity of warm xylene soluble part is 2-5dl/g;And
(c) homopolymerisation polyethylene of 19-20 weight %;Wherein the intrinsic viscosity of the component (c) is greater than 9dL/g;
The flexural modulus values of the polypropene composition are at least 1.63GPa;Izod notch shock (23 DEG C) numerical value is at least 37kJ/m2
2. polypropene composition according to claim 1, which is characterized in that fusing point >=160 DEG C of the component (a), institute The fusing point of component (c) is stated between 120 DEG C -135 DEG C.
3. polypropene composition according to claim 1 or 2, which is characterized in that the component (a) is continuous phase, described Component (b) and component (c) are dispersed phase, and the component (c) crystallizes in component (b).
4. the preparation method of polypropene composition described in any one of claims 1 to 3, uses Ziegler-Natta to urge Agent is prepared with continuous polymerization, the polymerization reaction zone carried out in order including at least three, wherein component (a), (b) and (c) it is prepared in different polymerization reaction zones in order, in addition to first segment, other each sections have been formed in first-stage polymerization reaction Polymer and catalyst used in the presence of operated.
5. according to the method described in claim 4, being carried out under liquid phase or gas phase condition when it is characterized in that, preparing component (a) Polymerization, preparation component (b) and (c) are polymerize under gas phase condition.
6. according to the method described in claim 5, it is characterized in that, polymerization temperature is 0-150 DEG C when liquid phase polymerization, polymerization pressure Power is higher than saturated vapour pressure of the propylene under corresponding polymerization temperature;When gas-phase polymerization, polymerization temperature is 0-150 DEG C, and pressure is 0.5-3.0MPa。
7. according to the method described in claim 6, it is characterized in that, polymerization temperature is 40-100 DEG C when liquid phase polymerization;Gas phase is poly- When conjunction, polymerization temperature is 40-100 DEG C.
8. according to the method described in claim 4, catalyst used in it includes titanium compound, magnesium compound and interior electron Body, the internal electron donor are selected from least one of the following general formula polyester compound:
Wherein:
A, B be carbon or selected from nitrogen, oxygen, sulphur, boron hetero atom;
R1-R6、R1-RnGroup is the C of identical or different hydrogen, halogen or substituted or unsubstituted linear chain or branched chain1-C20Alkane Base, naphthenic base, aryl, alkaryl, aralkyl, alkylene, fused ring aryl, ester group, and R1And R2It is not hydrogen, R3-R6And R1-RnBase In group arbitrarily include substituent of one or several hetero atoms as carbon or hydrogen atom or both, the hetero atom selected from nitrogen, Oxygen, sulphur, silicon, phosphorus or halogen atom, R3-R6And R1-RnOne or more of group can link up cyclization;
N is the integer of 0-10;
When A or B is oxygen or sulphur, the number of R group connected thereto is 0;It is connected thereto when A or B is boron or nitrogen The number of R group is 1;When A or B is carbon or silicon, the number of R group connected thereto is 2, and when A and B is carbon When, it is bonded in the form of carbon-carbon single bond or double or triple bonds between A and B, when bonded in the form of carbon-carbon single bond between A and B, A It is 2 with the number of the B R group being separately connected, when bonded in the form of carbon-carbon double bond between A and B, R group that A is connected with B Number 1, when bonded in the form of triple carbon-carbon bonds between A and B, the number 0 for the R group that A is connected with B.
9. according to the method described in claim 8, wherein the internal electron donor be selected from bis- (benzoyloxy methyl) fluorenes of 9,9-, Bis- (propylene carboxymethyl group) fluorenes of 9,9-, bis- (the third carboxymethyl group) fluorenes of 9,9-, bis- (cortex cinnamomi carboxymethyl group) fluorenes of 9,9-, 2- isopropyl- Two benzoyloxy propane of 2- isopentyl -1,3-, two propylene carboxyl propane of 2- isopropyl -2- isopentyl -1,3-, 2- isopropyl -2- Isopentyl -1,3- dipropyl carboxyl propane, bis- benzoyloxy ethane of 1,2-, bis- benzoyloxy propane of 1,3-, bis- benzoyloxy of 1,4- Butane, ortho-xylene carboxyl benzene, two cortex cinnamomi carboxyl propane of 2- isopropyl -2- isopentyl -1,3-, four (benzoyloxy methyl) first Alkane, tri- benzoyloxy propane of 1,2,3-, two benzoyloxy pentane of 2,2,4- trimethyl -1,3- and 2,2- diisobutyl -1,3- two At least one of benzoyloxy propane.
10. a kind of product is prepared by composition described in any one of claims 1 to 3.
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