WO2011088754A1 - 一种具有高熔体强度的丙烯均聚物及其制备方法 - Google Patents
一种具有高熔体强度的丙烯均聚物及其制备方法 Download PDFInfo
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F110/00—Homopolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F110/04—Monomers containing three or four carbon atoms
- C08F110/06—Propene
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- C—CHEMISTRY; METALLURGY
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F10/04—Monomers containing three or four carbon atoms
- C08F10/06—Propene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/001—Multistage polymerisation processes characterised by a change in reactor conditions without deactivating the intermediate polymer
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/38—Polymerisation using regulators, e.g. chain terminating agents, e.g. telomerisation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F4/00—Polymerisation catalysts
- C08F4/06—Metallic compounds other than hydrides and other than metallo-organic compounds; Boron halide or aluminium halide complexes with organic compounds containing oxygen
- C08F4/16—Metallic compounds other than hydrides and other than metallo-organic compounds; Boron halide or aluminium halide complexes with organic compounds containing oxygen of silicon, germanium, tin, lead, titanium, zirconium or hafnium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F4/00—Polymerisation catalysts
- C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
- C08F4/44—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
- C08F4/60—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with refractory metals, iron group metals, platinum group metals, manganese, rhenium technetium or compounds thereof
- C08F4/62—Refractory metals or compounds thereof
- C08F4/64—Titanium, zirconium, hafnium or compounds thereof
- C08F4/642—Component covered by group C08F4/64 with an organo-aluminium compound
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2500/00—Characteristics or properties of obtained polyolefins; Use thereof
- C08F2500/12—Melt flow index or melt flow ratio
Definitions
- the present invention relates to a multi-step propylene homopolymerization process for preparing polypropylene having a high melt strength.
- the present invention also relates to a propylene polymer, and more particularly to a propylene homopolymer having a high melt strength, which is particularly suitable for the preparation of foamed articles, thermoformed articles, biaxially oriented films, blown films and Blow molding products.
- the tailoring of the propylene homopolymer structure has made it widely used in the fields of injection molding, extrusion, casting, biaxial stretching and the like.
- ordinary polypropylene molecular chains have a linear structure, unlike amorphous polymers (such as polystyrene PS), which have rubber-elastic regions in a wide temperature range. Therefore, polypropylene cannot be used at a wide temperature. Thermoforming is carried out within the range. At the same time, the softening point of polypropylene is close to the melting point. When the temperature is higher than the melting point, the melt strength and the viscosity of the melt drop sharply, resulting in uneven wall thickness during hot forming. Extrusion, coating and pressure delay are prone to occur.
- HMSPP high melt strength polypropylene
- the main factors affecting the melt strength of polypropylene are the structure of the polymer molecule, including the size of the molecular weight, the molecular weight distribution and whether the molecular chain contains long chain branches and the length and distribution of long chain branches.
- the larger the molecular weight of the propylene polymer the greater the melt strength; however, the larger the molecular weight, the more disadvantageous the post-forming properties of polypropylene. Therefore, it is necessary to make polypropylene have a broad molecular weight distribution in consideration of the practical application of the material.
- the polymer product should contain both a small amount of "high molecular weight polymer fraction", a certain amount of "higher molecular weight polymer fraction” and a larger amount of "low molecular weight polymer fraction”.
- the disclosed methods for increasing the melt strength of polypropylene generally include: increasing the molecular weight of polypropylene by polymerization process, improving its distribution or introducing a branched structure, or adopting other amorphous or low crystallization during polymer processing. The resin and the elastomer are blended.
- the modulation polymerization process is a commonly used method, usually by preparing a broad molecular weight distribution polypropylene through a plurality of reactors or in-situ polymerization using a metallocene catalyst to obtain a long-chain branched polypropylene, thereby increasing the melt strength of the final polymer.
- the use of a plurality of reactors in series to prepare a broad molecular weight distribution polypropylene is most commonly used, which is usually selected in different amounts of hydrogen, different comonomers, that is, in different reactors that are advantageous for the production of polymers of different molecular weights.
- Polypropylene having a broad molecular weight distribution (MWD) is obtained by series polymerization, for example: one of the reactors facilitates the production of higher molecular weight polymers, while the other reactor facilitates the production of lower molecular weight polymers.
- a process for preparing a propylene polymer having a high melt strength and a broad molecular weight distribution, which is selected in a series of loop-gas phase polymerization reactors, is selected to have a lower hydrogen sensitivity, for example, in US Pat. No. 6,875,826 and US Pat. No. 7,365,136.
- the Ziegler-Natta catalyst the most characteristic of the Ziegler-Natta catalyst is the need to use a cyclopentanyl-containing siloxane such as dicyclopentyldimethoxysilane as an external electron donor for multi-stage
- the propylene (either reactor) is homopolymerized or copolymerized.
- the first stage produces a "high molecular weight fraction" of polypropylene (MFR ⁇ 0.1 g/10 min), which weighs 10-35% by weight, and produces a "low molecular weight fraction" in the second stage.
- Polypropylene polypropylene
- the type of external electron donor generally has a significant effect on the stereoregularity and molecular weight distribution of the polymer.
- the molecular weight and isotacticity of the high molecular weight fraction which determines the mechanical properties of the polymer are preferably as high as possible, especially in a certain amount.
- the "very high molecular weight fraction"; and the lower the molecular weight of the "low molecular weight fraction” which determines the extrusion performance (processability) of the polymer the better, and the higher the content.
- an external electron donor having a lower hydrogen sensitivity when used in a catalyst system, although the molecular weight of the polymer can be made higher in the first stage of producing a higher molecular weight fraction, it is more in production. In the second stage of the low molecular weight fraction, due to the insensitivity to hydrogen modulation, an extremely high hydrogen content is required to meet the actual requirements. However, if an external electron donor having a higher hydrogen modulating sensitivity is used in the catalyst system, although the second stage of producing the lower molecular weight fraction has a smaller amount of hydrogen, it is in the first stage of producing a higher molecular weight fraction. At this time, the molecular weight cannot be made sufficiently large to affect the mechanical properties of the final product.
- a two-stage method is also used to obtain a polypropylene resin composition having a high melt tension; wherein the first stage is to prepare a high molecular weight polypropylene under hydrogen-free conditions, and the second The low molecular weight polypropylene is prepared in the presence of hydrogen, and the same external electron donor such as dicyclopentyldimethoxysilane is used in the whole process; the prepared polypropylene may contain a molecular weight of more than 1.5 ⁇ 10 6 . Molecular weight component.
- it also fails to solve the problems associated with the aforementioned patents.
- polypropylene is produced by the method described in these patents, when the small molecule is prepared in the first stage, the external electron donor which is highly sensitive to hydrogen modulation will also function in the second stage, so that the super molecule cannot be prepared in the second stage. . Also, high melt strength propylene homopolymers having superior mechanical properties and processability are not available in these patents.
- the melt flow rate MFR requirement is about 2-3 g/10 min. Due to the limitations of the above polymerization process, the "very high molecular weight polymer” in the polymer Fraction ", “high molecular weight polymer fraction” and “low The molecular weight polymer fraction "The distribution of these three fractions is not ideal. Therefore, it has a certain influence on the properties of the final polymer.
- the present invention provides a process for preparing a high melt strength propylene homopolymer by direct polymerization.
- the inventors have found through trial and error that, in the different propylene polymerization stages of series operation, according to the requirements of different molecular weight fractions, by controlling the type and proportion of the external electron donor components in different reaction stages in the Ziegler-Natta catalyst system, it is preferred.
- a propylene polymer having a broad molecular weight distribution and containing a "very high molecular weight fraction" having excellent mechanical properties, particularly high melt strength can be prepared.
- the propylene polymerization process of the present invention comprises carrying out two or more stages of propylene homopolymerization in two or more reactors operated in series, wherein:
- the first stage in the presence of a Ziegler-Natta catalyst, a homopolymerization of propylene is carried out at a polymerization temperature of 50 to 100 ° C, and the MFR of the obtained polymer is controlled to be 0.01 to 0.3 g/10 min, and the Ziegler-Natta catalyst is used.
- the first external electron donor component is included;
- the second stage on the basis of the first stage reaction product, in the presence of hydrogen, the second external electron donor component is added to continue the homopolymerization of propylene; the final polymer
- the MFR is controlled to be 0.2 10 g/lOmin; wherein the first external electron donor is less sensitive to hydrogen modulation than the second external electron donor.
- the Ziegler-Natta catalyst consists of the following components: (1) a solid catalyst component mainly composed of magnesium, titanium, a halogen and an internal electron donor, (2) an organic An aluminum component, (3) a first external electron donor component; wherein a ratio between component (1) and component (2) is 1:10 to 500 (weight ratio) in terms of titanium to aluminum; (2) The ratio between the component (3) and the component (3) is 10 to 150:1 (weight ratio); in the second phase, the ratio between the organoaluminum component and the second external electron donor component is 1 ⁇ 50: 1 (weight ratio).
- the amount of the first external electron donor component is adjusted to a ratio of 1:15 to 100 (weight ratio) to the organoaluminum;
- the second external electron donor component is added to the ratio of the organoaluminum component added in the first stage to a ratio of 1:2-20 (weight ratio) to the organoaluminum.
- the amount of hydrogen added in the first and second stages is controlled by the requirements of the final MFR.
- the hydrogen content is less than or equal to 300 ppmV.
- the first external electron donor component is represented by the formula R' n Si (OR 2 ) 4 .n, wherein R 1 is the same or different and is a C 3 -C 6 branched or cyclic aliphatic group.
- R 2 is a -C 3 linear aliphatic group such as methyl, ethyl or propyl; n is 1 or 2.
- the second external electron donor component is represented by the formula R 3 n Si (OR 4 ) 4 .
- n is 0 or 1 or 2
- R 3 and R 4 are the same or different CVC 3 linear chain An aliphatic group; or as represented by the formula R 5 R 6 Si (OR 7 ) 2 wherein R 7 is a linear aliphatic group, ⁇ is a linear aliphatic group of ⁇ - ⁇ , R ⁇ 3 ⁇ 4C 3 -C 6 branched or cyclic aliphatic groups.
- the yield ratio of the first stage to the second stage is 30: 70-70: 30, preferably 40: 60-60: 40.
- the catalyst for propylene polymerization includes, but is not limited to, a Ziegler-Natta catalyst.
- the Ziegler-Natta catalyst used has been widely disclosed, preferably a catalyst having a high stereoselectivity, and the high stereoselective Ziegler-Natta catalyst described herein means that a propylene homopolymer having an isotactic index greater than 95% can be prepared.
- Such a catalyst usually contains (1) a solid catalyst component, preferably a titanium-containing solid catalyst active component; (2) an organoaluminum compound cocatalyst component; and (3) an external electron donor component.
- Such active solid catalyst-containing component (1) that can be used are disclosed in Chinese patents CN85100997, CN98126383.6, CN98111780.5, CN98126385.2, CN93102795.0, CN00109216.2 CN99125566.6, CN99125567.4 , CN02100900.7.
- the catalyst may be used as it is, or may be added after pre-complexation and/or pre-polymerization.
- the catalysts described in the Chinese patents CN85100997, CN93102795.0, CN98111780.5 and CN02100900.7 are particularly advantageous for use in the high melt strength polypropylene preparation process of the present invention.
- the cocatalyst component (2) of the present invention is an organoaluminum compound, preferably an alkylaluminum compound, more preferably a trialkylaluminum such as triethylaluminum, triisobutylaluminum, tri-n-butylaluminum or the like, wherein titanium is contained.
- the ratio of the solid catalyst component to the organoaluminum compound cocatalyst component is from 10 to 500:1 in terms of Al/Ti weight ratio.
- External electron donors having different characteristics are added to different reactors according to the requirements for different molecular weight fractions.
- the present invention requires To prepare a high molecular weight fraction of propylene polymer, in order to have a higher molecular weight of the fraction, an external electron donor having a lower hydrogen modulating sensitivity such as R'nSi(OR 2 ) 4 - n is selected.
- R 1 is the same or different and is a C 3 -C 6 branched or cyclic aliphatic group, preferably R 1 is cyclopentyl, isopropyl or cyclohexyl; R 2 is CC 3 straight A chain aliphatic group such as methyl, ethyl or propyl; n is 1 or 2, preferably 2.
- Specific compounds such as: dicyclopentyldimethoxysilane, diisopropyldimethoxysilane, dicyclohexyldimethoxysilane, diisobutyldimethoxysilane, and the like.
- the first external electron donor is dicyclopentyldimethoxysilane and/or diisopropyldimethoxysilane.
- the MFR value of the polymer obtained in the first stage is controlled to be 0.01-0.3 g/10 min. According to actual needs, it is generally selected that no molecular weight regulator is added in the first reactor or a very small amount (300 ppmV or less) of hydrogen is added as a molecular weight regulator. In order to obtain a high molecular weight fraction.
- a second external electron donor component and a molecular weight regulator (hydrogen) are added for the second-stage polymerization, and the MFR value of the final polymer is controlled to be 1 - 10 g/ 1 Omin.
- the second external electron donor component has the formula R 3 n Si (OR 4 ) 4 . n , where n is 0 or 1 or 2.
- R 3 and R 4 in the formula are the same or different ( ⁇ -(: 3 linear aliphatic group, such as methyl, ethyl or propyl. Specifically, but not limited to tetramethoxysilane, four Ethoxysilane, trimethylmethoxysilane, trimethylethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, etc.
- Second external electron donor group The formula is either R 5 R 6 Si (OR 7 ) 2 , wherein ⁇ is a linear aliphatic group, and R 5 is a CC 3 linear aliphatic group, such as methyl or ethyl.
- propyl, 16 is ( 3 & branched or cyclic aliphatic groups; specific compounds such as methylcyclohexyldimethoxysilane.
- the second external electron donor is preferably tetraethoxysilane and/or methylcyclohexyldimethoxysilane.
- the different stages of polymerization described in the polymerization process of the present invention can be carried out separately in different reactors.
- a specific embodiment is: the first stage of the polymerization is carried out in the first reactor and the second stage of the polymerization is carried out in the second reactor.
- a solid catalyst component containing magnesium, titanium, a halogen and an internal electron donor as a main component (2) an organoaluminum component, and (3) a first external
- the electron donor component is subjected to homopolymerization of propylene under substantially hydrogen-free conditions, and the obtained polymerization product is introduced into the first
- a second external electron donor component is added, and further homopolymerization of propylene is carried out in the presence of a certain amount of hydrogen.
- the three catalyst components may be added directly to the first reactor, or may be added to the first reactor after pre-complexation and/or pre-polymerization as is well known in the industry.
- the reactor in which the pre-complexation reaction is carried out may be in various forms for the purpose of obtaining sufficient and effective mixing of the components of the catalyst, which may be a continuous stirred tank reactor, a loop reactor, or a section of a tube containing a static mixer.
- the road can even be a pipeline in which the material is in a turbulent state.
- the temperature of the pre-complexation can be controlled between -10 and 60 ° C, and the preferred temperature is 0 to 30 ° C.
- the time for pre-complexation is controlled from 0.1 to 180 min, and the preferred time is from 5 to 30 min.
- a prepolymerization treatment can be carried out with or without a pre-complexed catalyst.
- the prepolymerization can be carried out continuously under liquid phase bulk conditions or intermittently in an inert solvent.
- the prepolymerization reactor may be a continuous stirred tank, a loop reactor, or the like.
- the prepolymerization temperature can be controlled between -10 and 60 ° C, and the preferred temperature is 0 to 40 ° C.
- the multiple of the prepolymerization is controlled to be 0.5 to 1000 times, and the preferred multiple is 1.0 to 500 times.
- the polymerization can be carried out in the liquid phase of propylene, or in the gas phase, or by a combination of liquid and gas.
- the polymerization temperature is 0 to 150 ° C, preferably 40 to 100 ° C; the polymerization pressure should be higher than the saturated vapor pressure of propylene at the corresponding polymerization temperature.
- the polymerization temperature is 0 to 150 ° C, preferably 40 to 100 ° C; the polymerization pressure may be normal pressure or higher, and the preferred pressure is 1.0 to 3.0 MPa (gauge pressure, the same applies hereinafter).
- the polymerization may be carried out continuously or intermittently.
- the continuous polymerization may be two or more liquid phase reactors or gas phase reactors connected in series, the liquid phase reactor may be a loop reactor or a stirred tank reactor, and the gas phase reactor may be a horizontal stirred bed reactor or a standing reactor.
- a stirred bed reactor or a fluidized bed reactor, etc., and the above liquid phase reactor and gas phase reactor may be arbitrarily combined.
- the propylene homopolymerization of the present invention is preferably carried out in two or more series of loop reactors.
- the obtained polymer of the present invention can be subjected to extrusion granulation using equipment, and additives such as an antioxidant, a light stabilizer, a heat stabilizer, a coloring agent, and a filler are usually added in the granulation.
- the present invention in the preparation method of the polymer of the present invention, by adjusting the amount of the external electron donor, the type, and the hydrogen addition amount at different stages of the two reactors connected in series or intermittent operation, A special catalyst is required, and no additional multifunctional comon monomer is added; the present invention can obtain a higher molecular weight component than a conventional method of adjusting the molecular weight distribution of the polymer only by different hydrogenation concentrations, and a smaller amount of hydrogen can be used. . Thus, higher performance products can be produced in a more economical manner.
- the polymerization method of the present invention can not only obtain a propylene polymer having a broad molecular weight distribution, but also has the highest characteristic of "high molecular weight fraction", and the content of "low molecular weight fraction" can be guaranteed to be larger than a certain amount.
- the melt strength of the obtained propylene polymer is remarkably improved, and the processability of the polymer is also ensured.
- the most specific method for preparing a propylene homopolymer having high melt strength according to the present invention is characterized in that, in two loop reactors connected in series, a two-stage propylene homopolymerization reaction is carried out, wherein the first stage: In the presence of a Ziegler-Natta catalyst, at a polymerization temperature of 50 to 100 ° C, a homopolymerization of propylene is carried out at a hydrogen content of 300 ppm or less, and the MFR of the obtained polymer is controlled to be 0.01 to 0.3 g/10 min.
- the Ziegler-Natta catalyst is composed of the following components: (1) a solid catalyst component mainly composed of magnesium, titanium, a halogen and an internal electron donor, and (2) an organoaluminum component, ( 3) dicyclopentyldimethoxysilane; wherein the ratio between component (1) and component (2) is 1:10 to 500 (weight ratio) in terms of titanium to aluminum; component (2) The ratio to the component (3) is 10 to 150:1 (weight ratio); the second stage: on the basis of the first stage reaction product, in the presence of hydrogen, tetraethoxysilane is added to continue the homopolymerization of propylene Reaction; the organoaluminum component added in the first stage Determination, fill the tetraethoxysilane, reacted with an organic aluminum ratio of 1 to 50 (weight ratio); final polymer MFR of controlling 0.2-10 g / 10min.
- the present invention also provides a propylene homopolymer having a high melt strength, which has the following characteristics:
- M z+1 / M n is greater than or equal to 70.
- polymers are not composed of a single molecular weight compound, and even a "pure" polymer consists of a mixture of homopolymers of the same chemical composition, molecular weight, and structure.
- the property that such a polymer has a non-uniform molecular weight i.e., a molecular weight of a different size or a heterogeneous one
- a polydispersity of a molecular weight is called a polydispersity of a molecular weight.
- the molecular weights of the polymers measured are average molecular weights.
- the average molecular weight of the polymers is the same, but the dispersibility is not necessarily the same.
- a molecular weight distribution of a polymer is measured using a gel permeation chromatograph, and a number average molecular weight, a weight average molecular weight, a Z average molecular weight or a Z+1 average molecular weight can be obtained from a molecular weight distribution curve.
- the weight of the high molecular weight fraction on the average of these molecular weights is different, and tends to increase sequentially, that is, M n ⁇ M w ⁇ M z ⁇ M z+1 .
- people use M w / M n molecular weight distribution expressed, M n portion near the low molecular weight polymers, i.e., affect the low molecular weight fraction of M n greater;!
- the molecular weight distribution M w /M n of the propylene polymer is generally controlled within 6-20.
- the fraction having a molecular weight of more than 5,000,000 is greater than or equal to 1.0 wt%, more preferably greater than or equal to 1.5 wt%.
- M z+1 / M n is preferably greater than or equal to 80.
- the fraction having a molecular weight of less than 50,000 is greater than or equal to 15.0% by weight, less than or equal to 40% by weight; more preferably greater than or equal to 17.5% by weight, less than or equal to 30%.
- the propylene homopolymer has an MFR of 1.6-6 g/10 min at 230 ° C and a load of 2.16 kg ; more preferably, the MFR is 2.5-6 g/10 min.
- a polymer having a dispersion index PI of from 6.0 to 20.0 can be obtained, preferably from 9.0 to 16.0.
- the melting point (Tm) of the propylene homopolymer of the present invention is greater than or equal to 163 °C, and the peak temperature (Tpeak-atref) of the ATREF temperature rising and rinsing curve is greater than or equal to 122 °C.
- the xylene soluble content is less than or equal to 4% by weight.
- the load VtFR at a load of 2.16 kg is 0.2-10 g/10 min, preferably 1.6-6 g/10 min ;
- the content of the molecular weight greater than 5 million fractions is greater than or equal to 0.8 wt%, preferably greater than or equal to 1.0 wt%;
- M z+1 / M n is greater than or equal to 70, preferably greater than or equal to 80.
- the propylene homopolymer has the following characteristics -
- M z+1 / M n is greater than or equal to 80;
- a molecular weight of less than 50,000 parts is greater than or equal to 17.5 wt%, less than or equal to 30%;
- the dispersion index of the polymer PI is 9.0-16.0.
- the polymer of the present invention has a higher melt strength than the prior art, and is more than 0.8 Newtons, and even more than 2.2 Newtons; it is mainly used for preparing foamed articles, biaxially oriented films, thermoformed articles, and blow molded articles. Detailed ways
- Melt strength Rheoten melt strength meter manufactured by Geottfert Maschinenstoff Pmefmaschinen, Germany.
- the instrument comprises a pair of rollers rotating in opposite directions, the polymer is melt-plasticized by a single-screw extruder, and then extruded through a 90° turning circular hole die.
- the uniaxial stretching is carried out between the two rolls by an equal acceleration acceleration method, and the tensile force can be measured by the measuring force element, and the maximum force value measured from the start of the stretching to the melt fracture is the so-called melt strength.
- Melt flow rate was measured according to ISO 1133, 230 ° C, 2.16 kg load.
- ARES Advanced Rheometer Expansion System
- Molecular weight distribution (MJM m M + J / M n ): The molecular weight and molecular weight distribution of the sample were determined by a combination of PL-GPC 220 gel permeation chromatograph from Polymer Laboratories, UK and IR5 detector from Polymer Char, Spain.
- the column is 3 series Plgel ⁇ MIXED-B column, solvent and mobile phase are 1, 2, 4-trichlorobenzene (containing 0.3g/1000ml antioxidant 2, 6-dibutyl-p-cresol), column temperature 150 ° C, flow rate 1.0 ml / min.
- the tensile strength of the resin is measured in accordance with ASTM D638-00.
- Intrinsic viscosity Measured according to ASTM D 5225-1998 using the Y501C intrinsic viscosity analyzer from VISCOTEK, USA. The solvent was decahydronaphthalene and the test temperature was 135 °C.
- the polymerization was carried out on a set of polypropylene pilot plants. Its main equipment includes a prepolymerization reactor, a first loop reactor and a second loop reactor.
- the polymerization method and steps are as follows: (1) Prepolymerization:
- Example 1 of CN93102795 The process described in Example 1 of CN93102795 is obtained with a Ti content of 2.4 wt%, a Mg content of 18.0 wt%, and a di-n-butyl phthalate content of 13 wt%.
- the main catalyst, the cocatalyst (triethylaluminum), the first external electron donor (dicyclopentyldimethoxysilane, DCPMS) were continuously contacted at 10 ° C for 20 min, and then continuously added to the prepolymerization reactor.
- the prepolymerization reactor was carried out, and the prepolymerization was carried out in a liquid phase of propylene liquid at a temperature of 15 ° C and a residence time of about 4 min.
- the prepolymerization ratio of the catalyst was about 120 to 150 times.
- the flow rate of triethylaluminum fed to the prepolymerization reactor was 6.33 g/hr
- the flow rate of dicyclopentyldimethoxysilane was 0.33 g/hr
- the flow rate of the main catalyst was about 0.01 g/hr.
- the catalyst After prepolymerization, the catalyst enters two loop reactors in series, and homopolymerization of propylene is completed in the loop reactor.
- the polymerization temperature of the two-ring tube was 70 ° C, and the reaction pressure was 4.0 MPa.
- the process conditions of the loop reactor are controlled such that the yield ratio of the first and second loops is about 45:55.
- the hydrogen concentration detected by on-line chromatography is ⁇ 10 ppmV
- a certain amount of hydrogen is added to the second loop reactor feed
- the hydrogen concentration detected by on-line chromatography is 4500 ppmV.
- the ratio of cyclopentyldimethoxysilane (Al/Si-I) to the catalyst prepolymer was 19.0 (weight ratio).
- TEOS tetraethoxysilane
- the activity of the catalyst in the reactor is removed by wet nitrogen, and the polymer is dried by heating to obtain a polymer powder.
- the powder obtained by the polymerization was added with 0.1 wt% of IRGAFOS 168 additive, 0.2 wt% of IRGANOX 1010 additive, and 0.05 wt% of calcium stearate, and granulated by a twin-screw extruder.
- the pellets were tested for performance in accordance with current ASTM standards.
- Example 2
- Example 3 As in Example 1, only a small amount of hydrogen was added to the make-up propylene feed of the first loop reactor, and the hydrogen concentration detected by on-line chromatography was 230 ppmV. The amount of hydrogen fed to the propylene feed to the second loop reactor was adjusted to 8500 ppmV. By adjusting the amount of external electron donor feed, Al/Si-I was adjusted to 45 (weight ratio) and Al/Si- ⁇ was adjusted to 4.2 (weight ratio). The amount of cocatalyst added to triethylaluminum was unchanged.
- Example 3 Example 3:
- Example 5 In the same manner as in Example 3, only the hydrogen feed amount in the supplementary propylene feed of the second loop reactor was adjusted to 12,000 ppmV. - Example 5:
- Example 2 In the same manner as in Example 2, only the tetraethoxysilane in the second loop reactor was changed to methylcyclohexyldimethoxysilane (CHMMS) in an amount of 1.51 g/hr, Al/Si-II. The ratio was 4.2 (weight ratio); and, the Al/Si-I of the first loop reactor was adjusted to 60.
- CHMMS methylcyclohexyldimethoxysilane
- Al/Si-II weight ratio
- T38f Polypropylene produced by Hunan Changsheng Petrochemical Co., Ltd.
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- Engineering & Computer Science (AREA)
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- Manufacturing & Machinery (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
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Priority Applications (7)
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BR112012018282A BR112012018282B1 (pt) | 2010-01-22 | 2011-01-21 | homopolímero de propileno com elevada resistência à fusão, seu uso e seu processo de preparação |
SG2012054078A SG182655A1 (en) | 2010-01-22 | 2011-01-21 | Propylene homopolymer having high melt strength and preparation method thereof |
KR1020127021847A KR101798500B1 (ko) | 2010-01-22 | 2011-01-21 | 고 용융강도를 가지는 프로필렌 단일중합체 및 이의 제조 방법 |
CN201180010274.3A CN102884093B (zh) | 2010-01-22 | 2011-01-21 | 一种具有高熔体强度的丙烯均聚物及其制备方法 |
EP11734336.8A EP2527376B1 (en) | 2010-01-22 | 2011-01-21 | Preparation method for propylene homopolymer having high melt strength |
US13/574,435 US9068030B2 (en) | 2010-01-22 | 2011-01-21 | Propylene homopolymer having high melt strength and preparation method thereof |
ZA2012/06323A ZA201206323B (en) | 2010-01-22 | 2012-08-22 | Propylene homopolymer having high melt strength and preparation method thereof |
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CN2010100009756A CN102134291B (zh) | 2010-01-22 | 2010-01-22 | 一种高熔体强度聚丙烯的制备方法 |
CN201010000975.6 | 2010-01-22 | ||
CN201010000974.1 | 2010-01-22 | ||
CN2010100009741A CN102134290B (zh) | 2010-01-22 | 2010-01-22 | 具有高熔体强度的聚丙烯及其制品 |
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EP (1) | EP2527376B1 (zh) |
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MY (1) | MY158286A (zh) |
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US9068030B2 (en) | 2015-06-30 |
BR112012018282B1 (pt) | 2020-04-07 |
MY158286A (en) | 2016-09-30 |
CN102884093A (zh) | 2013-01-16 |
CN102884093B (zh) | 2014-03-12 |
KR101798500B1 (ko) | 2017-11-16 |
EP2527376A4 (en) | 2015-04-29 |
SG10201500468RA (en) | 2015-03-30 |
BR112012018282A2 (pt) | 2016-04-19 |
KR20120127466A (ko) | 2012-11-21 |
SG182655A1 (en) | 2012-08-30 |
US20130023598A1 (en) | 2013-01-24 |
EP2527376B1 (en) | 2017-07-19 |
ZA201206323B (en) | 2013-10-30 |
EP2527376A1 (en) | 2012-11-28 |
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