A kind of polypropene composition and polypropylene granulesTechnical field
The present invention relates to a kind of polypropene composition and a kind of polypropylene granules.
Background technology
Polypropylene sheet is as trnaslucent materials.Research shows, can be improved after a small amount of ethene is introduced in propylene polymerization processesIts optical transparence.The transparent polypropylene composition for being used at this stage is mainly with homo-polypropylene or ethylene contents in 1-Resin based on the ethylene/propene copolymer of 7mol%, and glucitols or metal carboxylate nucleator are added, it is blended through twin-screwIt is obtained after extrusion.The mist degree of the polypropene composition prepared by the method generally >=10%, impact strength generally≤5KJ/M2.Although the performance requirement being normally applied can be met, there is a problem of that transparency and toughness are not enough in some applications.
CN1675257A discloses a kind of thermoplastic polymer blend, and the blend contains the super of about 0.1-30 weight %Low density polyethylene (LDPE)（ULDPE, density is 0.85-0.93g/mL, and melt index is total to for the ethylene/propene of 0.25-50g/10minPolymers）, about 0-35 weight % isotaxy ethylene/propylene olefinic random copolymer（IPP）Poly- third is advised between about 35-99.9 weight %Polyamino alkenyl thing（SPP）.Research shows, when the weight ratio of SPP/ULDPE/IPP is 70/20/10 or 60/20/20,1/16 inchThe mist degree of print is 7.1%, and IZOD notch impact strengths are 14.9 foot-pounds/inch at 23 DEG C.
CN1659200A discloses a kind of propylene copolymer compositions and preparation method thereof, the propylene copolymer compositionsComprising A）The propylene copolymer of the non-propylene alkene of the % of weight containing 1-20, and B）The non-propylene alkene of at least one % of weight containing 5-98Propylene copolymer, wherein the propylene copolymer compositions are by two benches or multistage polymerization method, and in two ranksSection is all obtained using the catalyst system based on metallocene compound.The propylene copolymer compositions obtained using the method are hadThere is normal temperature impact strength 45kJ/m higher2Pliability higher, and component（A）And component（B）Containing low ratio canBy the material of n-hexane dissolution, with good stress whitening behavior, while having excellent low-temperature impact toughness and uniformComonomer distribution, and good sense of touch, but its transparent performance needs further raising.
CN1861674A discloses a kind of polypropene composition with excellent impact resistance, bending modulus and transparency, andSaid composition is specifically disclosed to include：（a）The highly crystalline random copolymer of 80-95 weight %, the highly crystalline random copolymer be containingThere are the ethylene-propylene random copolymer of 1-5 weight % ethene and the propylene -1- butene random copolymerization containing 2-12 weight %1- butyleneThing；With（b）The ethylene-propylene elastomeric copolymer of 5-20 weight %, the ethylene-propylene elastomeric copolymer contains 30-50 weight % secondAlkene, wherein, component（b）With component（a）Melt mass flow rate ratio be 1.5-35.Research shows, by controlling ethene-the thirdAlkene elastomer copolymer and ethylene-propylene random copolymer or the melt mass flow rate of propylene -1- butene random copolymersThan, and the mol ratio of ethylene/propene in ethylene-propylene elastomeric copolymers is controlled, ethylene-propylene elastomeric copolymers can be madeWith the particle diameter high degree of dispersion less than 1 micron, obtained polypropene composition is at 230 DEG C, the melt under the effect of 2.16kg counterweightsMass flow rate >=20g/10min, IZOD notch impact strengths >=9kgcm/cm, bending modulus>8500kg/cm2, mist degreeIt is 10-15%.The polypropene composition has good mechanical property, is adapted to production cold storage container, refrigerated container, packaging for foodstuffContainer, extrusion moulding product, blow-molded article, film, thin slice and bottle stopper etc., but transparency is general.
CN101506297A discloses a kind of polypropene composition, and the polypropene composition contains：（a）Propylene copolymer A,The bending modulus of its fusing point with less than 160 DEG C and below 1000MPa, and（b）Ethylene-propylene rubber B, based on ethene-the thirdThe weight of alkene rubber B, wherein propylene content are 80-92 weight %, wherein, the polypropene composition has at least below 0 DEG CIn two glass transition points, and two glass transition points one between -45 DEG C to -5 DEG C, and wherein described poly- thirdThe PE crystallinity of ene compositions is less than 3%.Although said composition has impact strength higher, the transparency is not enough.
CN102234400A discloses a kind of polypropene composition and preparation method thereof.The polypropene composition contains 1-Butene content is the propylene/butene random copolymer and Milliken NX8000 nucleators of 0.5-7.5mol%.But, although this gathersPropylene compositions have more excellent rigidity and the transparency, but toughness is not enough.
CN1415655A discloses a kind of preparation method of transparent polypropylene, and the method is included colophony type polypropylene nucleationLow density polyethylene (LDPE) or LLDPE and homopolymerization third of the agent with melt mass flow rate for 0.01-100g/10minAlkene blending is obtained.But, although the transparent polypropylene has more excellent rigidity, but toughness is not enough, and mist degree can only achieve30%。
CN1369519A discloses a kind of transparent polypropene composition, and the polypropene composition is by 99.0-99.97 weightsThe auxiliary of polypropylene, the nucleator of 0.01-0.6 weight %, the primary antioxidant of 0.01-0.2 weight % and 0.1-0.2 weight % for measuring % resistsOxygen agent is constituted, wherein, the nucleator is combined by two kinds of nucleators.Research invention, the mist degree of the polypropene composition is smallIn 10%, but impact property is not enough.
CN101503539A discloses a kind of toughened cold-resistant transparent modified polypropylene material, and the polypropylene material contains 60-The HOPP of 90 weight portions, the toughener of 10-30 weight portions, the α nucleators of 0.1-0.4 weight portions, 0.1-0.4 weight portionsBeta nucleater, the antioxidant of 0.2-0.4 weight portions.Research shows that the polypropylene material has excellent normal low-temperature impact strongDegree, but transparency is not enough.
Therefore, in order to meet it is actually used the need for, need badly at present exploitation one kind can have concurrently high impact strength and thoroughlyThe polypropene composition of lightness.
The content of the invention
Melting is heated it is an object of the invention to provide a kind of new polypropene composition and by the polypropene compositionAnd the polypropylene granules that extruding pelletization is formed.The polypropene composition can have impact strength and transparency higher concurrently.
The invention provides a kind of polypropene composition, wherein, the polypropene composition contain polypropylene A, polypropylene B,Nucleator and antioxidant；The polypropylene A is the copolymer of Noblen and/or ethene and propylene, and the polypropylene B is secondThe copolymer of alkene and propylene, the content of ethylene unit unit is higher than ethylene unit unit content in polypropylene A in the polypropylene B8-15%, and fusing points of the polypropylene B under the heating rate of 10 DEG C/min than polypropylene A 10 DEG C/min heating rateUnder fusing point it is low 90-95 DEG C.
Present invention also offers a kind of polypropylene granules, the polypropylene granules are well mixed by above-mentioned polypropene compositionHeating afterwards melts what simultaneously extruding pelletization was formed.
The impact strength that the polypropene composition of present invention offer is can be seen that from the result of embodiment is not less than7.9KJ/m2, mist degree is not higher than 7.8%, i.e. can well have high impact strength and transparency concurrently.
A preferred embodiment of the invention, when the nucleator in the polypropene composition is MillikenDuring NX8000, the nucleator is particularly well-suited to polypropene composition of the invention, can very well induce the polypropylene A andThe crystallization of polypropylene B, the polypropylene granules very high so as to obtain transparency.Contrast from embodiment 1 and embodiment 4 canGo out, using Milliken NX8000 as nucleator, the mist degree of the polypropylene granules for enabling to is down to 5.3% to embodiment 1, andEmbodiment 4 uses 1,3:2,4- double (3,4- dimethylbenzylidene) sorbierites as nucleator, the polypropylene granules for obtainingMist degree is 7.8%.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Specific embodiment
Specific embodiment of the invention is described in detail below.It should be appreciated that described herein specificImplementation method is merely to illustrate and explain the present invention, and is not intended to limit the invention.
The polypropene composition that the present invention is provided contains polypropylene A, polypropylene B, nucleator and antioxidant；The polypropyleneA is the copolymer of Noblen and/or ethene and propylene, and the polypropylene B is the copolymer of ethene and propylene, described poly- thirdThe content of ethylene unit unit is than ethylene unit unit content 8-15% high in polypropylene A in alkene B, and the polypropylene B is 10DEG C/heating rate of min under fusing point of the fusing point than polypropylene A under the heating rate of 10 DEG C/min it is low 90-95 DEG C.
In the present invention, the fusing point is obtained using the test of DSC methods.
, according to the invention it is preferred in the case of, the content of ethylene unit unit is 0-5 weight %, and institute in the polypropylene AFusing points of the polypropylene A under the heating rate of 10 DEG C/min is stated for 140-160 DEG C；Ethylene unit unit in the polypropylene BContent is 8-16 weight %, and fusing points of the polypropylene B under the heating rate of 10 DEG C/min is 50-65 DEG C.
According to the present invention, although as described above, the polypropylene A can be Noblen, or ethene and thirdThe content of ethylene unit unit can be 0-5 weight %, but in order that poly- third for obtaining in the copolymer of alkene, and the polypropylene AEne compositions have transparency higher, and under preferable case, the polypropylene A is the copolymer of ethene and propylene, and described poly-The content of ethylene unit unit is 2-4 weight % in propylene A.
The present invention is not particularly limited to the density and melt mass flow rate of the polypropylene A and polypropylene B, butIn order that the polypropene composition for obtaining has impact strength higher, under preferable case, the density of the polypropylene A is0.90-0.92g/cm2, the melt mass flow rate at 230 DEG C, under the effect of 2.16kg counterweights is 20-30g/10min；InstituteThe density for stating polypropylene B is 0.85-0.88g/cm2, at 230 DEG C, the melt mass flow rate under the effect of 2.16kg counterweightsIt is 15-20g/10min.
Wherein, the melt mass flow rate of the polypropylene A and polypropylene B is according to specified in GB/T3682-2000Method is determined.Wherein, test condition includes：Temperature is 230 DEG C, and load is 2.16kg.
According to the present invention, the polypropylene A and polypropylene B can be commercially available, for example, the polypropylene A can be withIt is that the trade mark produced by the factory of sinopec Beijing Yanshan Mountain branch company chemical industry two is the polypropylene of K4925, the polypropylene B can serve as reasonsThe trade mark of exxonmobil chemical company's production is the polypropylene of VMX6202.Additionally, the polypropylene A and polypropylene B can alsoPrepared by existing method, this those skilled in the art can be known, will not be described in great detail herein.
The present invention is not particularly limited to the content of above-mentioned each material in the polypropene composition, for example, with 100 weightsMeasure on the basis of the polypropylene A of part, the content of the polypropylene B can be 2-20 weight portions, and the content of the nucleator canThink 0.1-0.5 weight portions, the content of the antioxidant can be 0.01-0.5 weight portions；Under preferable case, with 100 weight portionsThe polypropylene A on the basis of, the content of the polypropylene B is 10-20 weight portions, and the content of the nucleator is 0.2-0.4Weight portion, the content of the antioxidant is 0.1-0.3 weight portions.
According to the present invention, the species of the nucleator is known to the skilled person, can for it is existing it is various canThe material of the polypropylene transparent is improved, for example, can be Sorbitol Nucleator.The Sorbitol Nucleator it is specificExample is included but is not limited to：1,3:2,4- bis-（To methyl benzylidene）Sorbierite（Abbreviation MDBS）、1,3:2,4- is double（3,4- bis-Methyl benzylidene) sorbierite（Referred to as 3988）With 1,3:2,4- bis-（To ethyl benzylidene）Sorbierite（Abbreviation EDBS）InOne or more.However, it was found by the inventors of the present invention that when the nucleator is Milliken NX8000（Purchased from Milliken Co.,The trade mark is NX8000）When, the polypropylene granules for enabling to have transparency higher.
According to the present invention, the antioxidant can for it is existing it is various be prevented from or delay the aging material of polypropylene,Under preferable case, the antioxidant contains primary antioxidant and aid anti-oxidants, and the primary antioxidant is phenolic antioxidant, described to help anti-Oxygen agent is phosphite ester kind antioxidant.
The present invention is not particularly limited to the species of the phenolic antioxidant, for example, the phenolic antioxidant can be selectedFrom four [β-（3,5- di-tert-butyl-hydroxy phenyls）Propionic acid] pentaerythritol ester（Referred to as：Antioxidant 1010）, 1,3,5- front threesBase -2,4,6- (3,5- di-t-butyl -4- hydroxyphenylmethyls) benzene（Referred to as：Antioxidant 330）, 1,3,5- tri- (3,5- di-t-butyls-4- hydroxybenzyls) isocyanuric acid（Referred to as：Antioxidant 3114）With β-（3,5- di-tert-butyl-hydroxy phenyls）Positive 18 carbon of propionic acidAlcohol ester（Referred to as：Antioxidant 1076）In one or more, particularly preferably [β-（3,5- di-tert-butyl-hydroxy phenyls）ThirdAcid] pentaerythritol ester and/or 1,3,5- trimethyls -2,4,6- (3,5- di-t-butyl -4- hydroxyphenylmethyls) benzene.
According to the present invention, the present invention is not particularly limited to the species of the phosphite ester kind antioxidant, for example, describedPhosphite ester kind antioxidant can for example be selected from three（2,4- di-tert-butyl-phenyls）Phosphite ester（Referred to as：Irgasfos 168）, it is double（2,4- DI-tert-butylphenol compounds）Pentaerythritol diphosphites（Referred to as：Antioxidant 626）With it is double（2,4- di-tert-butyl-phenyls）SeasonPenta tetrol diphosphites（Referred to as：Antioxidant PEP-36）In one or more, particularly preferably three（2,4- di-tert-butylsBase）Phosphite ester.
The present invention is not particularly limited to the consumption of the phenolic antioxidant and phosphite ester kind antioxidant, for example, instituteThe weight ratio for stating phenolic antioxidant and phosphite ester kind antioxidant can be 0.2-1：1, preferably 0.4-0.6：1, can so makeObtaining the polypropylene granules can have preferable antioxidant, mist degree and impact strength concurrently.
As a rule, the catalyst of the polypropylene A and polypropylene B is prepared for Zieger-Natta catalyst systems, itsIt is, with metal chloride as carrier, to have a certain amount of residues of chloride in resin.Therefore, Polypropylene compositions of the inventionThing preferably also contains acid-acceptor.The acid-acceptor is in acrylic resin first as halogen（Chlorion）Absorbent, can disappearThe catalyst remained in the halogen and resin in resin is removed, prevents it from producing gelinite with resin effect, while can be withPrevent the corrosion to equipment.
The present invention is not particularly limited to the species of the acid-acceptor, for example, can be stearate and/or hydrated aluminumSour magnesium carbonate, particularly preferably calcium stearate, can not only so remove the catalyst remained in polypropylene, also with lubricationEffect, is more beneficial for the machine-shaping of polypropene composition.
Additionally, the present invention is also not particularly limited to the consumption of the acid-acceptor, polyacrylic can be contained according to describedAmount is suitably selected, and as a rule, on the basis of the polypropylene A of 100 weight portions, the content of the acid-acceptor can be0.01-0.1 weight portions, preferably 0.04-0.06 weight portions.
Additionally, heating melting and extruding pelletization after being well mixed by above-mentioned polypropene composition present invention also offers one kindThe polypropylene granules of formation.
According to the present invention, by the method for polypropene composition heating melting and extruding pelletization, condition and used squeezeGo out machine known to those skilled in the art.Specifically, polypropylene A, polypropylene B, nucleator, antioxidant and selectivity are containedThe mixture of some acidulants heats melting and extruding pelletization on the twin screw extruder.As a rule, the twin-screw extrusionThe condition of work of machine includes：Screw speed is 150-360 revs/min, and each zone temperatures are respectively 170-230 DEG C, 175-240DEG C, 180-250 DEG C, 180-250 DEG C, 180-250 DEG C, 175-240 DEG C, the vacuum of each section is the condition of 0.02-0.09MPaLower extruding pelletization.Vacuum in this specification refers to the absolute value of absolute pressure and the difference of atmospheric pressure.
Additionally, in order that the polypropylene granules for obtaining are more uniformly distributed, under preferable case, the polypropylene granules that the present invention is providedBe additionally included in by polypropene composition heating melting before, first by the polypropylene A, polypropylene B, nucleator, antioxidant andThe acid-acceptor and surfactant that selectivity contains are uniformly mixed in being added to existing various mixing apparatus.Wherein, instituteIt for example can be mixer, kneader, mill and banbury etc. to state mixing apparatus.The temperature and time for stirring mixing is abilityWell known to field technique personnel, for example, the temperature of stirring mixing can be 25-65 DEG C, the time for stirring mixing can be 5-30 pointsClock, the rotating speed for stirring mixing can be 50-300 revs/min.
Below will the present invention will be described in detail by embodiment.
In following examples and comparative example, nucleator Milliken NX8000 is purchased from Milliken Co., and the trade mark is NX8000.
In following examples and comparative example：
The melt mass flow rate of polypropylene A and polypropylene B method according to specified in GB/T3682-2000 is determined,Wherein, test condition includes：Temperature is 230 DEG C, and load is 2.16 kilograms.The fusing point of polypropylene A and polypropylene B is according to ASTMMethod specified in D3418-08 is determined.Wherein, test condition includes：Heating rate is 10 DEG C/min.Polypropylene A and polypropyleneEthene and propylene structural unit content in B use the nuclear magnetic resonance purchased from the model BRUKER400 of Bruker companies of SwitzerlandSpectrometer is measured, wherein, solvent is deuterated o-dichlorohenzene.
Embodiment 1
The embodiment is used to illustrate the polypropene composition of present invention offer and the preparation method of polypropylene granules.
By 90 parts by weight of polypropylene A（The K4925 of the factory of sinopec Beijing Yanshan Mountain branch company chemical industry two production, propylene structure listThe content of unit is 97 weight %, and the content of ethylene unit unit is 3.0 weight %, and the fusing point under the heating rate of 10 DEG C/min is150 DEG C, the melt mass flow rate at 230 DEG C, under the effect of 2.16kg counterweights is 25g/10min, and density is 0.905g/cm3）, 10 parts by weight of polypropylene B（The trade mark of exxonmobil chemical company's production is the polypropylene of VMX6206, propylene structure listThe content of unit is 85 weight %, and the content of ethylene unit unit is 15 weight %, and the fusing point under the heating rate of 10 DEG C/min is56 DEG C, the melt mass flow rate at 230 DEG C, under the effect of 2.16kg counterweights is 18g/10min, and density is 0.860g/cm3）, the Milliken NX8000 of 0.4 weight portion, 0.05 weight portion [β-（3,5 di-t-butyl 4- hydroxy-phenies）Propionic acid] season pentaFour alcohol esters（Antioxidant 1010）, 0.1 weight portion three (2,4- di-tert-butyl-phenyls）Phosphite ester（Irgasfos 168）, 0.05 weightThe calcium stearate for measuring part is well mixed at 25 DEG C of normal temperature, and in the mixture feeding double screw extruder that will be obtained, adjusts spiral shellThe rotating speed of bar is 150 revs/min, and each zone temperatures are controlled at 180 DEG C, 190 DEG C, 200 DEG C, 200 DEG C, 200 DEG C and 190 respectively℃；The vacuum of each section is maintained at 0.02-0.09MPa；Mixture in screw rod and the cylinder of above-mentioned extruder, through superfusionAfter melting, shear, disperseing, compressing, being vented, plastifying, then through die head extrusion, pelletizing, obtain polypropylene granules P1.
Embodiment 2
The embodiment is used to illustrate the polypropene composition of present invention offer and the preparation method of polypropylene granules.
By 85 parts by weight of polypropylene A（The trade mark of sinopec Beijing Yanshan Mountain company of branch company production is the polypropylene of K4925,The content of propylene construction unit is 97 weight %, and the content of ethylene unit unit is 3.0 weight %, in the heating rate of 10 DEG C/minUnder fusing point for DEG C, the melt mass flow rate at 230 DEG C, under the effect of 2.16kg counterweights is 25g/10min, and density is0.905g/cm3）, 15 parts by weight of polypropylene B（The trade mark of exxonmobil chemical company's production is the polypropylene of VMX6206, thirdThe content of alkene construction unit is 85 weight %, and the content of ethylene unit unit is 15 weight %, under the heating rate of 10 DEG C/minFusing point for DEG C, the melt mass flow rate at 230 DEG C, under the effect of 2.16kg counterweights is 18g/10min, and density is0.860g/cm3）, the Milliken NX8000 of 0.4 weight portion, 0.05 weight portion [β-（3,5 di-t-butyl 4- hydroxy-phenies）ThirdAcid] pentaerythritol ester（Antioxidant 1010）, 0.1 weight portion three (2,4- di-tert-butyl-phenyls）Phosphite ester（Irgasfos 168）、The calcium stearate of 0.05 weight portion is well mixed at 25 DEG C of normal temperature, and in the mixture feeding double screw extruder that will be obtained,The rotating speed of adjusting bolt is 150 revs/min, and each zone temperatures are controlled at 180 DEG C, 190 DEG C, 200 DEG C, 200 DEG C, 200 DEG C respectivelyWith 190 DEG C；The vacuum of each section is maintained at 0.02-0.09MPa；Mixture is passed through in the screw rod and cylinder of above-mentioned extruderCross after melting, shearing, dispersion, compression, exhaust, plasticizing, then through die head extrusion, pelletizing, obtain polypropylene granules P2.
Embodiment 3
The embodiment is used to illustrate the polypropene composition of present invention offer and the preparation method of polypropylene granules.
By 80 parts by weight of polypropylene A（The trade mark of sinopec Beijing Yanshan Mountain company of branch company production is the polypropylene of K4925,The content of propylene construction unit is 97 weight %, and the content of ethylene unit unit is 3.0 weight %, in the heating rate of 10 DEG C/minUnder fusing point be 150 DEG C, the melt mass flow rate at 230 DEG C, under the effect of 2.16kg counterweights is 25g/10min, densityIt is 0.905g/cm3）, 20 parts by weight of polypropylene B（The trade mark of exxonmobil chemical company's production is the polypropylene of VMX6206,The content of propylene construction unit is 85 weight %, and the content of ethylene unit unit is 15 weight %, in the heating rate of 10 DEG C/minUnder fusing point be 56 DEG C, the melt mass flow rate at 230 DEG C, under the effect of 2.16kg counterweights is 18g/10min, and density is0.860g/cm3）, the Milliken NX8000 of 0.4 weight portion, 0.05 weight portion [β-（3,5 di-t-butyl 4- hydroxy-phenies）ThirdAcid] pentaerythritol ester（Antioxidant 1010）, 0.1 weight portion three (2,4- di-tert-butyl-phenyls) phosphite esters（Irgasfos 168）、The calcium stearate of 0.05 weight portion is well mixed at 25 DEG C of normal temperature, and in the mixture feeding double screw extruder that will be obtained,The rotating speed of adjusting bolt is 150 revs/min, and each zone temperatures are controlled at 180 DEG C, 190 DEG C, 200 DEG C, 200 DEG C, 200 DEG C respectivelyWith 190 DEG C；The vacuum of each section is maintained at 0.02-0.09MPa；Mixture is passed through in the screw rod and cylinder of above-mentioned extruderCross after melting, shearing, dispersion, compression, exhaust, plasticizing, then through die head extrusion, pelletizing, obtain polypropylene granules P3.
Embodiment 4
The embodiment is used to illustrate the polypropene composition of present invention offer and the preparation method of polypropylene granules.
Method according to embodiment 1 prepares polypropylene granules, unlike, Milliken NX8000 identical weights part1,3:2,4- is double（3,4- dimethylbenzylidenes) sorbierite replacement, obtain polypropylene granules P4.
Embodiment 5
The embodiment is used to illustrate the polypropene composition of present invention offer and the preparation method of polypropylene granules.
Method according to embodiment 1 prepares polypropylene granules, unlike, in preparation process, the polypropylene A uses poly-Noblen（The trade mark of sinopec Beijing Yanshan Mountain company of branch company production is the polypropylene of T1701, in the intensification of 10 DEG C/minFusing point under speed is 165 DEG C, at 230 DEG C, the melt mass flow rate under the effect of 2.16kg counterweights be 1.0g/10min,Density is 0.908g/cm3）Substitute, obtain polypropylene granules P5.
Comparative example 1
The comparative example is used to illustrate the preparation method of reference polypropylene composition and polypropylene granules.
Method according to embodiment 1 prepares polypropylene granules, unlike, the polypropylene B is poly- with identical weight partPropylene A is substituted, and obtains reference polypropylene pellet DP1.
Comparative example 2
The comparative example is used to illustrate the preparation method of reference polypropylene composition and polypropylene granules.
Method according to embodiment 1 prepares polypropylene granules, unlike, Milliken NX8000 is added without, obtain referencePolypropylene granules DP2.
Comparative example 3
The comparative example is used to illustrate the preparation method of reference polypropylene composition and polypropylene granules.
Method according to embodiment 1 prepares polypropylene granules, unlike, the polypropylene B is with the third of identical weight partAlkene/octene copolymer（The trade mark of Dow Chemical's production is POE8200, and the content of ethylene unit unit is 62 weight %, pungentThe content of alkene construction unit is 38 weight %, 59 DEG C of the fusing point under the heating rate of 10 DEG C/min, at 230 DEG C, 2.16kg weightsMelt mass flow rate under code effect is 5g/10min, and density is 0.870g/cm3）Substitute, obtain reference polypropylene pelletDP3。
Test case 1-5
The performance that test case 1-5 is used for the polypropylene granules P1-P5 for illustrating present invention offer is tested.
（1）Mist degree：It is measured according to method specified in GB/T2410-2008, wherein, the thickness of injection-molded plaques is 1mm,Acquired results are as shown in table 1；
（2）Simply supported beam notch impact strength：Determined according to method specified in GB/T1043.1-2008, acquired results are such asShown in table 1；
（3）The measure of melt mass flow rate：Determined according to method specified in GB/T3682-2000, wherein, testCondition includes：Temperature is 230 DEG C, and load is 2.16 kilograms, and acquired results are as shown in table 1.
Contrast test example 1-3
Contrast test example 1-3 is used to illustrate the test of reference polypropylene granule performance.
Method according to test case 1-5 is tested the performance of reference polypropylene pellet DP1-DP3, acquired results such as tableShown in 1.
Table 1
From the results shown in Table 1, the impact strength of the polypropylene granules that the present invention is provided is not less than 7.9KJ/m2MPa, mist degree is not higher than 7.8%, i.e. can well have excellent impact strength and transparency concurrently.From embodiment 1 and in factThe contrast of example 4 is applied as can be seen that when the nucleator in the polypropene composition is Milliken NX8000, the nucleator canThe crystallization of the polypropylene A and polypropylene B is induced well, the polypropylene granules higher so as to obtain transparency.From embodiment 1Contrast with embodiment 5 is as can be seen that when the copolymer that the polypropylene A is ethene and propylene, and wherein ethylene unit unitContent be 2-4 weight % when, the polypropylene granules for enabling to have transparency higher.
The preferred embodiment of the present invention described in detail above, but, the present invention is not limited in above-mentioned implementation methodDetail, in range of the technology design of the invention, various simple variants can be carried out to technical scheme, thisA little simple variants belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned specific embodiment, in not lanceIn the case of shield, can be combined by any suitable means.In order to avoid unnecessary repetition, the present invention to it is various canThe combination of energy is no longer separately illustrated.
Additionally, can also be combined between a variety of implementation methods of the invention, as long as it is without prejudice to originallyThe thought of invention, it should equally be considered as content disclosed in this invention.