CN108003423A - A kind of polypropylene toughening additive - Google Patents
A kind of polypropylene toughening additive Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions 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
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F210/16—Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions 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
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
- C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
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- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions 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
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/14—Copolymers of propene
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- C—CHEMISTRY; METALLURGY
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2308/00—Chemical blending or stepwise polymerisation process with the same catalyst
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Abstract
The invention discloses a kind of polypropylene toughening additive.It is a kind of ethylene polymer composition；The ethylene polymer composition includes component A1 and component A2, and component A1 is the homopolymer of ethene, and component A2 is the copolymer of the alhpa olefin of ethene and at least two 4 10 carbon atoms, its weight average molecular weight is higher than the weight average molecular weight of component A1；The polypropylene toughening additive that the present invention obtains is used for polypropylene modification, and obtained composite material toughness is high, can the extensive use in bumper, automotive upholstery and building materials.
Description
Technical field
The present invention relates to polyblend technical field, and specifically, the present invention relates to a kind of addition of polypropylene toughening
Agent.
Background technology
Polypropylene (PP) has the advantages that inexpensive, light, processing performance is good and is widely used, and is widely used in house by people
Many fields such as electricity, automobile, building materials, agricultural.Polyacrylic demand increases year by year, and yield is also being continuously increased.But poly- third
There is modulus is low and the shortcomings that poor toughness, this significantly limit the application and development of polypropylene material for alkene material.
At present, the method for improving polypropylene material toughness in the prior art is mainly changed by adding other polymers blending
Property.One of method is to add heat-resistant powder filler with polypropylene blending modified, can effectively improve the toughness of polypropylene material,
But the modulus of polypropylene material can be significantly reduced, such as bending modulus can drop to close to 800MPa；The two of method are to add
High-performance polymer, as nylon and polyacrylic blending and modifying effectively can keep or improve the modulus of polypropylene material, still
Improving the form of high-performance polymer and polyacrylic compatibility and high-performance polymer in polypropylene matrix can just improve
The toughness of polypropylene material.
A kind of polypropylene material of polyolefin thermoplastic elastomer (POE) toughness reinforcing is disclosed in Chinese patent CN97111916
Material., it is necessary to add substantial amounts of elastomeric component, about more than 20wt%, this causes poly- third for higher impact strength in order to obtain for it
The rigidity of alkene material declines to a great extent；Simultaneously as the price of polyolefin elastomer is high, the cost of polypropylene material is added.
The content of the invention
For overcome the deficiencies in the prior art, it is an object of the invention to provide a kind of polypropylene toughening additive.This is poly-
Propylene flexibilizer additive preparation method is simple, of low cost, it is used for polypropylene modification, obtained composite material toughness
It is high.
Technical solution of the present invention is specifically described as follows.
The present invention provides a kind of polypropylene toughening additive, it is a kind of ethene polymers, its melt index MFR2For
0.1-10g/10min, density 0.915-0.935g/cm3.The ethylene polymer composition includes component A1 and component A2；
The component A1 is the homopolymer of ethene, its weight average molecular weight is 1000~50000g/mol；The component A2 is ethene and extremely
The copolymer of the alpha-olefin of few two kinds of 4-10 carbon atoms, its weight average molecular weight are higher than the weight average molecular weight of component A1；Described group
The density for dividing A1 is 0.940-0.960g/cm3, density of the density less than component A1 of the component A2；The weight of the component A1
Average molecular weight is 8000~50000g/mol, and the weight average molecular weight of component A2 is 50000-300000g/mol；Based on component A1 and
The total amount of A2, the content of component A1 is 40-60wt%, and the content of component A2 is 60-40wt%.
In the present invention, the weight average molecular weight of the ethylene polymer composition is 50000~150000g/mol, molecular weight
It is distributed as 8~40.
The ethylene polymer composition of the present invention, can be mechanical blend either in-situ blending thing or mechanical blending
The mixture of thing and in-situ blending thing, a portion component in-situ blending, then with the other components machinery in composition altogether
It is mixed.In-situ blending thing refers to be mixed together each component in the polymerisation process of compositions described below.Term is in situ altogether
Mixed thing and mechanical blend are meant that well-known in the art.
In the present invention, the polypropylene toughening additive is prepared by following methods：
(1) ethene, hydrogen, the polymerization containing transition metal component and trialkylaluminum activator are provided in the first polymeric area
Catalyst, generates component A1 herein.The transition metal component includes the metal of the 4th or 5 races in periodic table system；
(2) ethene, hydrogen, the polymerization catalyst and at least two 4-10 carbon atom are provided in the second polymeric area
Alpha-olefin comonomer, generates the ethylene polymer component A2 of weight average molecular weight of the weight average molecular weight higher than component A1 herein；
Wherein：First polymeric area and the second polymeric area are serially connected, and the polymer of the first polymeric area generation is present in second
In polymeric area, based on the total amount of component A1 and A2, component A1 accounts for 40-60wt%, and component A2 accounts for 60-40wt%.
Above-mentioned first polymeric area is annular-pipe reactor, and second polymeric area is Gas-phase reactor.
The composition of the present invention can be mixed further with other components.This mixture, i.e. blend include defined above
Ethylene polymer composition and other components.Other components can be polymers compositions and/or additive, such as routinely
For the additive in polymer.It selects to depend on its final application with dosage.
The beneficial effects of the present invention are：The polypropylene toughening addictive preparation method is simple, of low cost, it is used to gather
Propylene is modified, and dosage is few, and obtained composite material toughness is high, can be in bumper, automotive upholstery and building materials
Can extensive use.
Embodiment
The present invention is further elaborated on reference to embodiment.
The present invention provides a kind of polypropylene toughening additive, containing the ethylene polymer composition comprising resin matrix, its
Melt index MFR2For 0.1-10g/10min, density 0.915-0.935g/cm3。
In the present invention, which can be bimodal or multimodal, and preferably includes and account for A1 and A2 is total
The component A1 of weight 40-60wt% and account for A1 and A2 gross weights 60-40wt% component A2 bimodal polymer compositions.It is more excellent
Choosing, component A1 account for 45-55wt%, and component A2 accounts for 45-55wt%.
The weight average molecular weight of ethylene polymer composition is preferably 50000~200000g/mol, more preferably 50000-
150000g/mol.Preferably, using the molecular weight distribution of the ratio between weight average molecular weight and number-average molecular weight definition as 8-40, preferably 15-
35.In addition, the co-monomer content of ethylene copolymer A is preferably 1-10wt%, more preferably 2-10wt%.
Component A1 is the homopolymer of ethene.Its weight average molecular weight is 5000~50000g/mol, preferably 8000~
50000g/mol.In addition, its density is 0.940-0.960g/cm3, it is preferably 0.940-0.955g/cm3。
Component A2 is the copolymer of the alpha-olefin of ethene and at least two 4-10 carbon atom.Its weight average molecular weight is higher than
The weight average molecular weight of component A1, its density are less than the density of component A1.Preferably, its weight average molecular weight is 50000-300000g/
mol.Preferably, its density is 0.900-0.935g/cm3.Preferably, high molecular weight component has the comonomer of 2-20wt%
Content, and the particularly preferably co-monomer content of 5-20wt%.
Ethylene polymer composition can contain additive known in the art and auxiliary agent.Therefore it can contain antioxidant and
Stabilizer, such as Irganox 1010 and Irgaphos 168, it can contain antistatic additive, such as ethoxyquin ammonium, ethoxyquin acyl
Amine and glyceryl monostearate, caking inhibiter, such as talcum or silica, slipping agent, such as oleamide and erucyl amide, acid
Neutralizer, such as calcium stearate and zinc stearate, processing aid, such as fluoroelastomer, and nucleator, such as sodium benzoate.This
The suitable amounts of a little additives are that this area is commonly known.One of skill in the art can select suitable additive and its use
Amount is with the required performance for the tubing for realizeing combination thing and being produced from it.
Ethylene polymer composition can be gathered by any polymerization known in the art, such as slurry, solution or gas phase
Close, produce the polymer composition.Polymerization can be single step or multistep polymerization.
Can by polymerisation process, in-situ blending each component either a part of component or by according to
Two kinds of manner known in the art mechanical blending or more kinds of components individually produced, so that multimodal defined above is produced,
For example, at least bimodal ethylene copolymer A.
Preferably, ethylene copolymer A is bimodal polymer compositions, and thus the present invention further provides production polymer
The method of composition, the polymer composition include at least two different Alathon or copolymer groups defined above
Point A1 and A2, wherein by single step or multistep polymerization method, in the presence of polymerization catalyst, polymerizing ethylene monomer, optional
Blow one or more alpha-olefin comonomer, produces each component.Preferably using one or more polymer reactors, lead to
Multistep processes production component A1 and A2 are crossed, the polymer reactor can be identical or different, for example, at least slurry-slurry, gas phase-gas
Phase or any combinations of slurry-gas phase polymerization.Identical or different polymerization can be used, parallel or order carries out each
Step., can be by the polymer that in each step except the first step, is formed in preceding step in the order progress stage
It is polymerize in the presence of component, produces each component A1 and A2 in any order.Preferably, used in preceding step
Catalyst is also present in subsequent polymerization procedure.Alternatively, further catalyst can be added in a subsequent step, (it can be with
With preceding step used in catalyst it is identical or different).
Catalyst is not crucial, but preferably using Ziegler-Natta polymerization catalysts.This catalyst included
Cross metal component and activator.
Particularly preferred transition metal component includes halogenated titanium, the alkoxyalkyl magnesium of carrying on an inorganic
Compound and alkyl dihalides aluminium.
Activator is the compound of energy activated transition metal component.Useful activator especially alkyl aluminum and aluminum alkoxide
Compound.Particularly preferred activator is alkyl aluminum, especially trialkylaluminium, such as trimethyl aluminium, triethyl aluminum and triisobutyl
Aluminium.
In production component A1 (polymeric segment of low molecular weight), ceridust can occur poly- in slurry, solution or gas phase
Close.
Temperature needs in polymer reactor are sufficiently high, to reach the acceptable activity of catalyst.On the other hand, temperature
The softening temperature of polymer should not be exceeded.Can be in scope in 50-110 DEG C, preferably 75-105 DEG C and more preferably 75-100 DEG C
Select temperature.
The pressure that may be selected in reactor meets required purpose：Reach the density needed for reaction medium, reach suitable
Monomer concentration or maintain reactor in reactant in liquid phase.In slurry polymerization, suitable pressure limit is 10-100Bar,
It is preferred that 30-80Bar.In gas-phase polymerization, pressure 5-50Bar, preferably 10-30Bar.
If lower-molecular-weight component A1 is produced in slurry, by ethene and inert liquid diluent together with polymerization catalyst one
Rise and be incorporated into reactor.Introduce hydrogen into reactor, to control the weight average molecular weight of polymer.In addition, it can be used altogether
Polycondensation monomer controls the density of polymer.Hydrogen is set with density by the type and targeted weight average molecular weight of used catalyst
The exact amount of gas and final comonomer addition.Suitably, the hydrogen in feed fluid phase and ethylene ratio are 50-
600mol/kmol。
If being polymerize in the form of slurry polymerization, any suitable type of reactor known in the art may be used.Even
Continuous stirred tank and annular-pipe reactor is the fit example of useful type of reactor.In particular it is preferred to endless tube is anti-
Device is answered, because it is particularly conducive to more than the critical-temperature of fluid and pressure, is polymerize under so-called super critical condition.
In production component A2 (polymeric segment of high molecular weight), the alpha-olefin of ethene and at least two 4-10 carbon atoms is total to
Polycondensation monomer is copolymerized together.It can polymerize in slurry, solution or gas phase.
Temperature needs in polymer reactor are sufficiently high, to reach the acceptable activity of catalyst.On the other hand, temperature
The softening temperature of polymer should not be exceeded.Can be in scope in 50-110 DEG C, preferably 75-105 DEG C and more preferably 75-100 DEG C
Select temperature.
The pressure that may be selected in reactor meets required purpose：Reach the density needed for reaction medium, reach suitable
Monomer concentration or maintain reactor in reactant in liquid phase.In slurry polymerization, suitable pressure limit is 10-100Bar,
It is preferred that 30-80Bar.In gas-phase polymerization, pressure 5-50Bar, preferably 10-30Bar.
If high molecular weight component A2 is produced in Gas-phase reactor.In the case, monomer, inert gas, hydrogen will be contained
It is incorporated into reactor with the gaseous fluid of optional comonomer, polymerize herein.Typically, the hydrogen in gaseous fluid
It is 10-100mol/kmol with the ratio between ethene, and the ratio between comonomer and ethene summation are 10-200mol/kmol.
Therefore produce the method for above-mentioned polymer composition and preferably include following step, in slurry-phase reactor, preferred ring
In pipe reactor, under the conditions of existing for polymerization catalyst, polymerizing ethylene monomer, hydrogen, produce first polymer component A1.
The reaction product of above-mentioned steps is transferred in subsequent Gas-phase reactor with optional.
In Gas-phase reactor, in the presence of the reaction product of above-mentioned steps, polymerizing ethylene monomer, optional at least two
Alpha-olefin comonomer, produces second polymer component A2 to obtain the ethylene copolymer A of the present invention.
The explanation of analysis method
Alliance of the weight average molecular weight (MW) and molecular weight distribution (MWD) of polyethylene product in Waters, US
Measured on GPC2000 types gel permeation chromatography (GPC) instrument, 150 DEG C of test temperature, polystyrene are molten as standard specimen, trichloro-benzenes
Agent, flow 1.0ml/min.
Melt flow index MFR2：Melt flow index MFR is measured according to ISO method 1133, at 190 DEG C, under 2.16kg
Measure is (equivalent to ASTM D 1238, condition L).
Alpha-olefin content：The test of co-monomer content is to use method associated with infrared-nuclear magnetic resonance, is total to using nuclear-magnetism
Legal system of shaking calibrates directrix curve, according to GA2/T6040-2002, using German Brooker company IFS 66/S type infrared spectrum analysis
Instrument tests the infrared absorption pattern of polyethylene film, by standard curve, obtains co-monomer content.
Density：According to 1183 standards of ISO, using the bulk density of A2HM-2 types density gradient column test polymerizate.
Tensile strength and tension fracture elongation rate：Measured according to ISO 527.
Simply supported beam notch impact strength：Tested according to ISO179.
Izod notched impact strength：Tested according to ISO180.
Bending modulus and bending strength：Tested according to ISO178.
The preparation of 1 ethylene polymer composition of embodiment
Propane, ethene and hydrogen are continually introduced into the annular-pipe reactor that volume is 250 liters.In addition, silica is born
The titanium-magnesium catalyst of load is introduced together into the reactor together with triethyl aluminum, and titanium rubs in the aluminium and solid constituent in activator
You are than being 20.The annular-pipe reactor is operated at 95 DEG C of temperature and the pressure of 55Bar.In annular-pipe reactor, in fluid phase
Interior ethylene contents are 1.8mol%, and the ratio between hydrogen and ethene are 310mol/kmol.The speed of production of polymer is
13.5kg/h.The weight average molecular weight of the polymer produced in annular-pipe reactor is 40385g/mol, molecular weight distribution 4.76,
Density is 0.956g/cm3。
Slurry is drawn from annular-pipe reactor to flash vessel, reduces pressure herein to 3Bar.Polymer is guided to stream again
Change in bed Gas-phase reactor, also add extra ethene, 1- butylene, 1- hexene co-monomers and hydrogen herein and as inertia
Propane, the nitrogen of gas.Gas-phase reactor operates at 85 DEG C of temperature and the pressure of 20Bar.In the reactor, in circulating air
Middle ethylene partial pressure is 1Bar, and the ratio between hydrogen and ethene are 25mol/kmol, and the ratio between 1- butylene and ethene are 40mol/kmol, 1-
The ratio between hexene and ethene are 105mol/kmol.The speed of production of polymer is 16.5kg/h in Gas-phase reactor, so as in ring
Production between pipe and Gas-phase reactor is compared for 45/55.Total speed of production is 30kg/h.
The final densities of polymer masses are 0.921g/cm3, weight average molecular weight 115427g/mol, molecular weight distribution is
24.1- butene contents in polymer are 1.9wt%, and 1- ahexene contents are 5.8wt%.
The preparation of 2 ethylene polymer composition of embodiment
Propane, ethene and hydrogen are continually introduced into the annular-pipe reactor that volume is 250 liters.In addition, silica is born
The titanium-magnesium catalyst of load is introduced together into the reactor together with triethyl aluminum, and titanium rubs in the aluminium and solid constituent in activator
You are than being 20.The annular-pipe reactor is operated at 95 DEG C of temperature and the pressure of 55Bar.In annular-pipe reactor, in fluid phase
Interior ethylene contents are 1.8mol%, and the ratio between hydrogen and ethene are 280mol/kmol.The speed of production of polymer is
13.5kg/h.The weight average molecular weight of the polymer produced in annular-pipe reactor is 44648g/mol, molecular weight distribution 4.43,
Density is 0.950g/cm3。
Slurry is drawn from annular-pipe reactor to flash vessel, reduces pressure herein to 3Bar.Polymer is guided to stream again
Change in bed Gas-phase reactor, also add extra ethene, 1- butylene, 1- octene co-monomers and hydrogen herein and as inertia
Propane, the nitrogen of gas.Gas-phase reactor operates at 85 DEG C of temperature and the pressure of 20Bar.In the reactor, in circulating air
Middle ethylene partial pressure is 1Bar, and the ratio between hydrogen and ethene are 20mol/kmol, and the ratio between 1- octenes and ethene are 145mol/kmol,
The ratio between 1- butylene and ethene are 24mol/kmol.The speed of production of polymer is 16.5kg/h in Gas-phase reactor, so as to
Production between endless tube and Gas-phase reactor is compared for 45/55.Total speed of production is 30kg/h.
The final densities of polymer masses are 0.918g/cm3, weight average molecular weight 114328g/mol, molecular weight distribution is
27.1- octene contents in polymer are 5.9wt%, and 1- butene contents are 1.5wt%.
The preparation embodiment of tenacity-increased profax blend
Embodiment 3
(1) preparation of tenacity-increased profax blend
1 tenacity-increased profax blend of table, I raw material forms
Homopolypropylene used produces for Yanshan Petrochemical in the present embodiment, and the trade mark is K9935 (in 230 DEG C and 2.16kg
Under conditions of melt flow rate (MFR) be 3.1g/10min).
Copolymer polypropylene used produces for Kpic in the present embodiment, the trade mark for PP-R BP2000 (230 DEG C with
Melt flow rate (MFR) under conditions of 2.16kg is 0.3g/10min).
Material in table 1 is added in mixer according to dosage and is mixed, the rotating speed of mixer is 500 revs/min, mixing
4 minutes time；Melting extrusion in double screw extruder is subsequently entered, is granulated, you can obtain tenacity-increased profax blend I.Double spiral shells
Bar extruder technique is：One 180-190 DEG C of area, two 200-210 DEG C of areas, three 200-210 DEG C of areas, four 210-215 DEG C of areas, 5th area
210-215 DEG C, six 210-215 DEG C of areas, seven 215-225 DEG C of areas, eight 215-225 DEG C of areas, nine 215-225 DEG C of areas, ten area 215-225
DEG C, the residence time is 1.5 minutes, pressure 14MPa.
(2) characterization of the structure of tenacity-increased profax blend and performance
The structure of the tenacity-increased profax blend I prepared in the present embodiment see the table below 4 with performance characterization structure.
Embodiment 4
(1) tenacity-increased profax blend preparation method
2 tenacity-increased profax blend of table, II raw material forms
Homopolypropylene used produces for Yanshan Petrochemical in the present embodiment, and the trade mark is K9935 (in 230 DEG C and 2.16kg
Under conditions of melt flow rate (MFR) be 3.1g/10min).
Copolymer polypropylene used produces for Kpic in the present embodiment, the trade mark for PP-R BP2000 (230 DEG C with
Melt flow rate (MFR) under conditions of 2.16kg is 0.3g/10min).
Material in table 2 is added in mixer according to dosage and is mixed, the rotating speed of mixer is 500 revs/min, during mixing
Between 4 minutes, subsequently enter melting extrusion in double screw extruder, be granulated, obtain tenacity-increased profax blend II.Twin-screw extrusion
Machine technique is：One 180-190 DEG C of area, two 200-210 DEG C of areas, three 200-210 DEG C of areas, four 210-215 DEG C of areas, five area 210-215
DEG C, six 210-215 DEG C of areas, seven 215-225 DEG C of areas, eight 215-225 DEG C of areas, nine 215-225 DEG C of areas, ten 215-225 DEG C of areas, stop
Time is 1.5 minutes, pressure 14MPa.
(2) characterization of the structure of tenacity-increased profax blend and performance
The structure of the tenacity-increased profax blend II prepared in the present embodiment see the table below 4 with performance characterization structure.
Comparative example 1
3 tenacity-increased profax blend of table, III raw material forms
Homopolypropylene used produces for Yanshan Petrochemical in this comparative example, and the trade mark is K9935 (in 230 DEG C and 2.16kg
Under conditions of melt flow rate (MFR) be 3.1g/10min), copolymer polypropylene be Kpic production, trade mark PP-R
BP2000 (melt flow rate (MFR) under conditions of 230 DEG C and 2.16kg is 0.3g/10min), market circulation commodity LLDPE is
A kind of common polypropylene toughening additive.
Above-mentioned dispensing is added in mixer and is mixed, the rotating speed of mixer is 500 revs/min, incorporation time 4 minutes,
Melting extrusion in double screw extruder is subsequently entered, is granulated, obtains polypropylene blend IV, concrete technology is：One area 180-190
DEG C, two 200-210 DEG C of areas, three 200-210 DEG C of areas, four 210-215 DEG C of areas, five 210-215 DEG C of areas, six 210-215 DEG C of areas, 7th area
215-225 DEG C, eight 215-225 DEG C of areas, nine 215-225 DEG C of areas, ten 215-225 DEG C of areas, the residence time is 1.5 minutes, pressure
14MPa。
(2) characterization of the structure of polypropylene blend and performance
The structure of the tenacity-increased profax blend III prepared in this comparative example see the table below 4 with performance characterization structure.
4 tenacity-increased profax blend performance comparison of table
| Performance | Blend I | Blend II | Blend III |
| Tensile strength (MPa) | 20 | 19 | 14 |
| Izod notched impact strength (KJ/m2) | ≥26 | ≥25 | ≥15 |
| Simple beam impact strength (KJ/m2) | ≥56 | ≥55 | ≥41 |
| Bending modulus (MPa) | 1386 | 1365 | 1150 |
| Bending strength (MPa) | 20 | 19 | 12 |
| Melt index (g/10min) | 9.7 | 10.3 | 11.9 |
| Density (g/cm3) | 1.01 | 1.02 | 0.99 |
From the data in table 4 it can be found that using the polypropylene toughening additive of the present invention as matrix, appropriate modifying agent is added
The polypropylene blend I and II of gained is substantially better than comparative example in terms of tensile strength, impact strength, modulus and bending strength
Obtained polypropylene blend III in 1, this is because containing a variety of comonomers in polypropylene toughening additive of the present invention
Construction unit, the presence of this construction unit, adds point between copolymer molecule chain and between polypropylene molecular chain
Sub- intermolecular forces and entanglement probability so that polypropylene blend shows the performances such as good toughness and impact strength.Above-mentioned reality
Apply the product that the obtained polypropylene blend I and II of example can be used for having higher requirements to impact strength and toughness, such as automobile
Bumper and automotive upholstery.
It should be noted that embodiment described above is only used for explaining the present invention, do not form to any of the present invention
Limitation.By referring to exemplary embodiments, invention has been described, it should be appreciated that word wherein used is descriptive
With explanatory vocabulary, rather than limited vocabulary.The present invention can be made within the scope of the claims by regulation
Modification, and the present invention is revised in without departing substantially from scope and spirit of the present invention.Although the present invention described in it relates to
And specific method, material and embodiment, it is not intended that the present invention is limited to wherein disclosed particular case, on the contrary, this hair
It is bright to can be extended to other all methods and applications with identical function.
Claims (4)
- A kind of 1. polypropylene toughening additive, it is characterised in that：It is a kind of ethylene polymer composition, its melt index MFR2 For 0.1-10g/10min, density 0.915-0.935g/cm3；The ethylene polymer composition includes component A1 and component A2；The component A1 is the homopolymer of ethene, its weight average molecular weight is 1000~50000g/mol, the component A2 be ethene and The copolymer of the alpha-olefin of at least two 4-10 carbon atom, its weight average molecular weight are higher than the weight average molecular weight of component A1；Component The density of A1 is 0.940-0.960g/cm3, density of the density less than component A1 of the component A2；The weight of the component A1 Son amount is 8000~50000g/mol, and the weight average molecular weight of component A2 is 50000-300000g/mol；Based on component A1 and A2 Total amount, the content of component A1 is 40-60wt%, and the content of component A2 is 60-40wt%.
- 2. polypropylene toughening additive according to claim 1, it is characterised in that：The weight of the ethene polymers group thing is equal Molecular weight is 50000~150000g/mol, and molecular weight distribution is 8~40.
- 3. polypropylene toughening additive according to claim 1, it is characterised in that it is prepared by following methods：(1) ethene, hydrogen, polymerization catalyzed containing transition metal component and trialkylaluminum activator is provided in the first polymeric area Agent, the transition metal component include the metal of the 4th or 5 races in periodic table system, generate component A1 herein；(2) α-alkene of ethene, hydrogen, the polymerization catalyst and at least two 4-10 carbon atom is provided in the second polymeric area Hydrocarbon comonomer, generates the ethylene polymer component A2 of weight average molecular weight of the weight average molecular weight higher than component A1 herein；Wherein：First polymeric area and the second polymeric area are serially connected, and the polymer of the first polymeric area generation is present in the second polymerization In area, based on the total amount of component A1 and A2, component A1 accounts for 40-60wt%, and component A2 accounts for 60-40wt%.
- 4. polypropylene toughening additive according to claim 3, it is characterised in that：First polymeric area is ring canal reaction Device, second polymeric area is Gas-phase reactor.
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| CN106585018A (en) * | 2015-10-20 | 2017-04-26 | 中国石油化工股份有限公司 | Multilayer heat-shrinkable film |
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| CN102575073A (en) * | 2009-10-09 | 2012-07-11 | 北欧化工公司 | Glass fibre composite of improved processability |
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Application publication date: 20180508 |