CN106554551B - A kind of polyethylene composition and its microporous barrier - Google Patents
A kind of polyethylene composition and its microporous barrier Download PDFInfo
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- 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
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- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
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Abstract
The present invention provides a kind of polyethylene composition and its microporous barriers.The polyethylene composition contains component A, component B, component C and functional filler；The component A is the linear low density polyethylene of ethylene/alpha-olefin copolymerization, the melt index MI in the case where temperature is 190 DEG C, load is 2.16kgAFor 0.01-2g/10min, density pAFor 0.880-0.936g/cm3；The component B is the linear low density polyethylene of ethylene/alpha-olefin copolymerization, the melt index MI in the case where temperature is 190 DEG C, load is 2.16kgBFor 2.1-9.9g/10min, density pBFor 0.910-0.930g/cm3；The component C is the linear low density polyethylene of ethylene/alpha-olefin copolymerization, the melt index MI in the case where temperature is 190 DEG C, load is 2.16kgCFor 10-80g/10min, density pCFor 0.880-0.930g/cm3.When the polyethylene composition is prepared polyethene microporous membrane using Flat film strength, stretching ratio is big, rate of film build is high, and film forming is very good.
Description
Technical field
The present invention relates to a kind of polyethylene composition and its microporous barriers.
Background technique
Microporous barrier is one kind using thermoplastic as matrix, fills the composite material of the inorganic particulate of high-content, rolled,
Film is made in curtain coating, the methods of blown film, and it is tiny and be mutually communicated then further by uniaxial or biaxial stretching to obtain aperture
Microporous film material.Microporous barrier is only capable of allowing the lesser water vapour molecule of molecular structure to penetrate, and can not allow the water in coherent condition
Drop penetrates through, therefore has the characteristics that permeable watertight, and so as to achieve the effect that Waterproof Breathable, therefore microporous barrier is also referred to as
For ventilated membrane.
Theoretically, thermoplastic can be used as the matrix resin of ventilative membrane material.And since polyethylene is easypro with feel
It the characteristics of suitable softness, good toughness, therefore, is widely used polyethylene as ventilated membrane base resin material, especially uses next life
Produce the Related products such as disposable sanitary articles, water proof and moisture permeable material.
CN1281870A disclose it is a kind of with excellent processability and infiltrative micropore film composition, in the composition
Contain type low density polyethylene resin, acrylic resin, ethylene-propylene copolymer and other polyolefin resins simultaneously, though
The right micropore film composition can improve the physical property of microporous barrier to a certain extent, but its constituent species is more, between component
Poor compatibility, be unfavorable for being obviously improved for performance, and the stability of product is not easily controlled.CN1668689A discloses one
Method of the kind using polymerization methods production bimodal polyethylene composition as microporous barrier basis material, this method is to equipment and technique
It is more demanding, technical difficulty is larger, and properties of product adjustable extent is small, and flexibility is inadequate.CN101591458A discloses one kind
The production method of microporous barrier, the reisn base material of the microporous barrier is based on linear low density polyethylene, and it is poly- to be aided with low-density
Ethylene to improve the processing performances of high filling microporous film products, especially the linear low density polyethylene product of metallocene catalysis,
Since its molecular weight distribution is relatively narrow, processing performance is poor, improves processing performance with greater need for addition low density polyethylene (LDPE).However,
The addition of low density polyethylene (LDPE) can also cause the raising of microporous film products production cost to a certain extent；Meanwhile processing aid
It is fluoropolymer-containing that the cost that can also further increase final products is added.Further, since being added in the reisn base material
The uniformity of the inorganic fillers such as a large amount of calcium carbonate, the microporous barrier prepared by blowing is poor, and is unidirectionally drawn by flat membrane
The mechanical property of microporous barrier obtained by stretching method is poor, it is often necessary to be used in combination with polypropylene non-woven fabric.
Biaxially-oriented polyethylene (Biaxially Oriented Polyethylene, BOPE) microporous barrier be have it is special
Polyethylene (PE) resin of molecular structure is through the molding thin-film material of stretch processes.In the processing and forming mistake of BOPE microporous barrier
Cheng Zhong, after the processing of film drawn, PE macromolecular chain and crystalline texture generation are height-oriented, to significantly improve the drawing of film
Intensity is stretched, tension fracture elongation rate is reduced, and makes that the mist degree of film is lower, glossiness is higher and transparent more preferable.In addition,
Compared with the extrusioning blowing process of the prior art and squeezing out polyethylene film product prepared by casting technique, BOPE microporous barrier has
The advantages such as mechanical strength is high, puncture resistant and shock resistance are good, excellent optical performance, energy conservation and environmental protection.Therefore, BOPE film can quilt
It is widely used in packaging bag, the again side such as packaging bag, Vacuum Heat sealer, low temperature packaging film, composite membrane, medical and sanitary products, plastic film for agricultural use
Face.
The biaxial tension processing method of currently used microporous barrier has Flat film strength and envelope pulling method.Flat film strength
It has been applied in the processing of thin-film materials such as polypropylene (PP), polyamide (PA), polyethylene terephthalate (PET),
Technique is more mature.Compared with envelope pulling method, the stretching ratio of Flat film strength it is big (cross directional stretch multiplying power up to 10 times with
On), shaping speed fast (highest rolling speed is up to hundreds of ms/min), high production efficiency, and the mechanics of obtained film is strong
More preferably, but film forming is influenced significantly by process condition fluctuations, film stretch process for degree, optical property and the thickness uniformity
Difficulty is big, has higher requirement for raw material.Existing Biaxially-oriented polyethylene raw material is only applicable to envelope stretching substantially
Method prepare BOPE microporous barrier, and will these existing polyethylene raw materials using Flat film strength prepare BOPE microporous barrier when, exist
Film forming poor (tensile speed and stretching ratio are very low), film are easy to appear the defect of rupture, that is, are not suitable for substantially using flat membrane
Pulling method prepares microporous barrier.Therefore, it in order to make full use of the above-mentioned advantage of Flat film strength, needs to develop a kind of film forming at present
The modified resin for being suitable for Flat film strength and preparing polyethene microporous membrane that good and film is not easy to occur rupturing, and with this preparative
The excellent polyethene microporous membrane of energy.
Summary of the invention
The purpose of the invention is to overcome existing polyethylene raw material preparing polyethylene micropore using Flat film strength
There are film formings when film, and poor, film is easily broken, that is, is not suitable for preparing the defect of microporous barrier using Flat film strength, and provides one
Kind new polyethylene composition and the microporous barrier made of the polyethylene composition.
Specifically, polyethylene composition provided by the invention contains component A, component B, component C and functional filler；Institute
The linear low density polyethylene that component A is ethylene/alpha-olefin copolymerization is stated, it is molten in the case where temperature is 190 DEG C, load is 2.16kg
Melt index M IAFor 0.01-2g/10min, density pAFor 0.880-0.936g/cm3；The component B is ethylene/alpha-olefin copolymerization
Linear low density polyethylene, the melt index MI in the case where temperature is 190 DEG C, load is 2.16kgBFor 2.1-9.9g/10min,
Density pBFor 0.910-0.930g/cm3；The component C is the linear low density polyethylene of ethylene/alpha-olefin copolymerization, in temperature
Melt index MI under being 2.16kg for 190 DEG C, loadCFor 10-80g/10min, density pCFor 0.880-0.930g/cm3。
The present invention also provides the microporous barriers being prepared by above-mentioned polyethylene composition.
The present inventor has found after further investigation, by the above-mentioned component A with particular melt index and density,
Polyethylene composition obtained from component B and component C and functional filler are used cooperatively prepares poly- second using Flat film strength
When alkene microporous barrier, have the advantages that stretching ratio is big, rate of film build is high, can satisfy Flat film strength and the higher of raw material is wanted
It asks, and adapts to the economy demand of existing Flat film strength production line, great prospects for commercial application.
A preferred embodiment of the invention, the mass fraction of the component A described in the polyethylene composition
WAFor 25-90 parts by weight, the mass fraction W of the component BBFor 0.1-10 parts by weight, the mass fraction W of the component CCFor 10-
When 75 parts by weight, which is prepared on the basis of with preferable film forming by the polyethylene composition
Microporous barrier also has the advantages that excellent in mechanical performance.
According to another preferred method of implementation of the present invention, when the molecular weight distributing index of the component A and component B meets
Mw/Mn≤ 4.5, and the molecular weight distributing index of the component C meets Mw/MnWhen≤8.0, the polyethylene composition have compared with
On the basis of good film forming, also has the advantages that excellent in mechanical performance by the microporous barrier that the polyethylene composition is prepared.
Yet another preferred form according to the present invention, when component A, component B and component C in the polyethylene composition
Density pA、ρBAnd ρCBetween relationship meet -0.04≤ρA-ρB≤ 0.02 and -0.04≤ρA-ρCWhen≤0.02, the polyethylene
Composition also has mechanical property on the basis of with preferable film forming, by the microporous barrier that the polyethylene composition is prepared
Excellent advantage.
Other features and advantages of the present invention will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
The drawings are intended to provide a further understanding of the invention, and constitutes part of specification, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the structural schematic diagram for being used to prepare the multiple reactor shunting means of polyethylene composition.
Description of symbols
1- first reactor；2- second reactor；3- third reactor；4- solid-liquid (gas) separator；5- homogenization silo；
6- melt pelletization system.
Specific embodiment
Detailed description of the preferred embodiments below.It should be understood that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
Polyethylene composition provided by the invention contains component A, component B, component C and functional filler；The component A
For the linear low density polyethylene of ethylene/alpha-olefin copolymerization, melt index in the case where temperature is 190 DEG C, load is 2.16kg
MIAFor 0.01-2g/10min, density pAFor 0.880-0.936g/cm3；The component B is the linear low of ethylene/alpha-olefin copolymerization
Density polyethylene, the melt index MI in the case where temperature is 190 DEG C, load is 2.16kgBFor 2.1-9.9g/10min, density pB
For 0.910-0.930g/cm3；The component C is the linear low density polyethylene of ethylene/alpha-olefin copolymerization, is 190 in temperature
DEG C, load be 2.16kg under melt index MICFor 10-80g/10min, density pCFor 0.880-0.930g/cm3。
The polyethylene composition provided according to the present invention, it is preferable that the component A is temperature is 190 DEG C, load is
Melt index MI under 2.16kgAFor 0.01-1.5g/10min, the component B is in the case where temperature is 190 DEG C, load is 2.16kg
Melt index MIBFor 3-8g/10min, melt index MI of the component C in the case where temperature is 190 DEG C, load is 2.16kgCFor
10-60g/10min.It is highly preferred that melt index MI of the component A in the case where temperature is 190 DEG C, load is 2.16kgAFor
The melt index MI of 0.01-1g/10min, the component B in the case where temperature is 190 DEG C, load is 2.16kgBFor 3-5g/10min,
Melt index MI of the component C in the case where temperature is 190 DEG C, load is 2.16kgCFor 15-40g/10min.
In the present invention, the melt index is measured according to method specified in GB/T3682-2000, wherein
Test condition includes that temperature is 190 DEG C, load 2.16kg.
The polyethylene composition provided according to the present invention, it is preferable that the density p of the component AAFor 0.910-0.930g/
cm3, the density p of the component BBFor 0.913-0.928g/cm3, the density p of the component CCFor 0.905-0.928g/cm3.More
Preferably, the density p of the component AAFor 0.915-0.926g/cm3, the density p of the component BBFor 0.913-0.924g/
cm3, the density p of the component CCFor 0.910-0.926g/cm3.It is particularly preferred that component A, group in the polyethylene composition
The density p of part B and component CA、ρBAnd ρCBetween relationship meet -0.04≤ρA-ρB≤ 0.02, and -0.04≤ρA-ρC≤ 0.02,
The polyethylene composition enabled in this way is prepared on the basis of with preferable filming performance by the polyethylene composition
Obtained microporous barrier also has the advantages that excellent in mechanical performance.
The component A, component B and component C are the linear low density polyethylene of ethylene/alpha-olefin copolymerization, wherein linear
Structure refers in strand only containing short-chain branch structure, and does not contain long branched chain structure and cross-linked structure, by polymerized monomer and
Polymerization process condition is determined, is specifically known to the skilled person, and therefore not to repeat here.
The polyethylene composition provided according to the present invention, in order to enable the polyethylene composition arrived is with good filming
On the basis of energy, also have the advantages that excellent in mechanical performance by the microporous barrier that the polyethylene composition is prepared, it is preferable that
In the polyethylene composition, the mass fraction W of the component AAFor 25-90 parts by weight, the mass fraction W of the component BBFor
0.1-10 parts by weight, the mass fraction W of the component CCFor 10-75 parts by weight；It is highly preferred that in the polyethylene composition
In, the mass fraction W of the component AAFor 30-80 parts by weight, the mass fraction W of the component BBIt is described for 0.5-8 parts by weight
The mass fraction W of component CCFor 20-70 parts by weight.Further, the mass fraction W of the component AAWith the mass fraction of component C
WCWith the melt index MI of component AARelationship preferably satisfy 5.2 × lgMIA+11.6≥WA/WC≥0.9×lgMIA+ 2.1, it is more excellent
Be full 2.9 × lgMI of footA+6.8≥WA/WC≥1.1×lgMIA+ 2.7, enable to the polyethylene composition in flat membrane in this way
There is bigger stretching ratio and higher rate of extension in method film biaxial tension processing.
The polyethylene composition provided according to the present invention, particularly preferably, the polyethylene composition is 190 in temperature
DEG C, the melt index under load is 2.16kg be 0.1-20g/10min, most preferably 0.5-10g/10min.It is above-mentioned that will have
It is on the basis of particular melt index and the component A of density, component B and component C are used cooperatively, the polyethylene composition is whole
Melt index control in above-mentioned preferred range, the microporous barrier made of the polyethylene composition can be made while being had non-
Film forming, tensile strength and the punctured resistance of Chang Youyi.
The present invention is not particularly limited the content of the component B, using the total weight of the polyethylene composition as base
Standard, the mass percentage content M of the component BBPreferably≤35 weight %, more preferably≤25 weight %.
The polyethylene composition provided according to the present invention, it is preferable that the molecular weight distributing index of the component A and component B
Meet Mw/Mn≤ 4.5, and the molecular weight distributing index of the component C meets Mw/Mn≤8.0；It is highly preferred that the component A and
The molecular weight distributing index of component B meets 2.0≤Mw/Mn≤ 4.2, and the molecular weight distributing index satisfaction 3.5 of the component C≤
Mw/Mn≤6.0.Specifically, in order to obtain component A, component B with above-mentioned molecular weight distribution and component C, the component A and group
B is divided to obtain using metallocene catalyst polymerisation, and the component C polymerize to obtain using Ziegler-Natta catalyst.Wherein, institute
The type for stating metallocene catalyst and Ziegler-Natta catalyst can be the conventional selection of this field, for example, the metallocene
Catalyst is usually made of metallocene compound and organo-aluminum compound and optional electron donor, the ziegler-nata
Catalyst is usually made of magnesium titanium compound and organo-aluminum compound and optional electron donor, specially art technology
Known in personnel, therefore not to repeat here.The present inventor has found after further investigation, will use metallocene catalyst polymerisation
The obtained component A and component B with above-mentioned melt index and density, the tool being polymerize using Ziegler-Natta catalyst
There are the component C and functional filler of above-mentioned melt index and density to be used cooperatively, obtained polyethylene composition is with good
On the basis of good filming performance, the microporous barrier made of the polyethylene composition also has the advantages that excellent in mechanical performance.
The present invention is not particularly limited the content of alhpa olefin comonomer in the component A, component B and component C, example
Such as, the molar content of alhpa olefin comonomer can be each independently 0.2- in the component A, component B and component C
15mol%, preferably 1.5-10mol%.In the present invention, the molar content of alhpa olefin comonomer refers to by alpha-olefin polymerization shape
At structural unit mole account for total monomer structural unit mole ratio.In addition, the component A, component B and component
Alhpa olefin in C is each independently C3-C20At least one of alkene.The angle ready availability from raw material, the component A,
Alhpa olefin in component B and component C is preferably propylene, 1- butylene, 2- butylene, 3-methyl-1-butene, 4- methyl-1-butylene, 1-
Amylene, 3- Methyl-1-pentene, 4-methyl-1-pentene, 3,3- dimethyl -1- amylene, 3,4- dimethyl -1- amylene, 4,4- diformazan
Base-1- amylene, 1- hexene, 4- methyl-1-hexene, 5- methyl-1-hexene, 1- heptene, 2- heptene, 1- octene, 1- decene, 1- ten
At least one of two (carbon) alkene, 1- 14 (carbon) alkene, 1- 16 (carbon) alkene, (carbon) alkene of 1- 18 and 1- 20 (carbon) alkene, more
Preferably at least one of 1- butylene, 1- hexene and 1- octene.
The present invention is not particularly limited the content of each component in the polyethylene composition, for example, with the component
A, the total content of component B and component C are 100 parts by weight meters, and the content of the functional filler can be 50-300 parts by weight, excellent
It is selected as 60-200 parts by weight, more preferably 80-150 parts by weight.
The functional filler can be existing various inorganic fillers, and specific example includes but is not limited to: calcium carbonate,
Barium sulfate, titanium dioxide, talcum powder, zeolite, mica, clay, silica, diatomite, kaolin, alumina, calcium sulfate, magnesium sulfate,
At least one of calcium oxide and magnesia.From raw material it is ready availability from the point of view of, the functional filler is particularly preferably carbon
Sour calcium.In addition, the average grain diameter of the functional filler is preferably 0.05-10 μm, more preferably 0.1-5 μm, most preferably
0.5-2μm。
The polyethylene composition provided according to the present invention, it is preferable that the polyethylene composition also contains lubricant, in this way
The extrusion processability energy of the polyethylene composition can be improved.The type and dosage of the lubricant all can be this field
Conventional selection, for example, the lubricant can be selected from polyethylene glycol (PEG) series lubricant agent, fluoropolymer series lubricant agent, organic
Silicon series lubricant agent, fatty alcohol type emollients, fatty acid lubricant, fatty acid ester type emollients, stearic amide series lubricant agent,
Fatty acid metal soaps lubricant, alkane and at least one of oxidation of alkanes series lubricant agent and micro-and nano-particles series lubricant agent.
Specifically, the PEG series lubricant agent for example can be the PEG molecule that molecular weight is 500-50000, can be by blocking, connecing
Branch, crosslinking Treatment, can also pass through other chemical modifications or physical modification.The fluoropolymer series lubricant agent for example can be
At least one of polytetrafluoroethylene (PTFE), Kynoar, polyhexafluoropropylene etc., or other are unimodal or multimodal fluorine-containing poly-
Close object and crystallization or hemicrystalline fluoropolymer.The organo-silicic oil can be existing various with carbon, silicon atom
For molecular backbone, using the oligomer of the organic groups such as methyl, phenyl, alkoxy, vinyl or oligomer as the compound of side chain.
The fatty alcohol type emollients can be for example at least one of soft fat alcohol, tallow alcohol, tallow fatty alcohol etc..The rouge
Fat acids lubricant for example can be with stearic acid and/or 12- hydroxy stearic acid.The fatty acid ester type emollients for example can be hard
At least one of resin acid butyl ester, stearic acid list glycerolipid, cetyl palmitate, tearyl base ester etc..It is described
Stearic amide series lubricant agent for example can be stearic amide, oleamide, erucyl amide, n, n- ethylene bis stearic acid amide
At least one of (EBS) etc..The fatty acid metal soaps lubricant for example can be lead stearate, calcium stearate, tristearin
At least one of sour magnesium, synthesis calcium acetate etc..The alkane and oxidation of alkanes series lubricant agent can be for example atoleine, consolidate
At least one of body paraffin, polyethylene wax, polypropylene wax, ethylene oxide wax etc..The micro-and nano-particles series lubricant agent is for example
It can be powdered rubber and/or aerosil particles.In addition, with the gross mass of the component A, component B and component C for 100 parts by weight
Meter, the content of the lubricant can be 0.05-5 parts by weight, preferably 0.5-3 parts by weight.
In addition, can also contain in the polyethylene composition existing various in polyvinyl resin, polyethene microporous membrane
In usually used other auxiliary agents, and other described auxiliary agents will not stretching film forming to polyethylene composition provided by the invention
It is had adverse effect on mechanical property.Other described auxiliary agents include but is not limited to: antioxidant, slipping agent, antistatic agent, anti-sticking
At least one of agent etc..In addition, the dosage of other auxiliary agents all can be this field conventional selection, to this this field skill
Art personnel can know that therefore not to repeat here.
The polyethylene composition can be prepared according to existing various methods, for example, first prepare respectively component A,
Component B and component C, the lubricant then contained by the component A, component B and component C and functional filler and selectively and
Other auxiliary agents carry out mechanical mixture in mechanical mixing equipment according to the proportion, are then added in melt blending equipment and melt altogether
It is mixed.Wherein, the mechanical mixing equipment can be for example high-speed mixer, kneader etc..The melt blending equipment for example may be used
Think double screw extruder, single screw extrusion machine, open mill, mixer etc..
A preferred embodiment of the invention, the polyethylene composition multiple reactor as shown in Figure 1 simultaneously
Be prepared in coupling device, the multiple reactor shunting means include first reactor 1, second reactor 2, third reactor 3,
Solid-liquid (gas) separator 4, homogenization silo 5 and melt pelletization system 6, wherein the first reactor 1,2 and of second reactor
Third reactor 3 is connected in parallel, and the number of solid-liquid (gas) separator 4 is three, anti-with first reactor 1, second respectively
Answer device 2 to be connected to third reactor 3, the component A that is prepared by first reactor 1, the component B prepared by second reactor 2 and
The component C prepared by third reactor 3 is mutually separated in solid-liquid (gas) separator 4 different respectively, then will be through phase
Component A, component B and component C after separation be delivered in homogenization silo 5 in proportion and with functional filler and other additives
It is mixed together uniformly, is sent into melt pelletization system 6 carries out extruding pelletization later.Wherein, the polymerization in each reactor can be
Batchwise polymerization is also possible to continuous polymerization.When using multiple reactor parallel polymerization, W hereinafterA、WBAnd WCExist for each component
Yield in unit time in respective reaction device.
The present invention also provides the microporous barriers being prepared by above-mentioned polyethylene composition.
In addition, the microporous barrier can be simple tension film, or biaxial stretching film, preferably bidirectional stretched film,
The biaxial stretching film being more preferably prepared by flat membrane biaxial tension method.
It is known to the skilled person using the process that flat membrane biaxial tension method prepares microporous barrier.It specifically, first will be upper
State polyethylene composition be added in casting apparatus carry out squeeze out curtain coating slab, then by obtained slab in film biaxial tension
Drawing and forming is carried out in equipment obtains the microporous film material that aperture is tiny and is mutually communicated.In extrusion process, extrusion temperature
It can be 160-260 DEG C, the temperature for being cast chilling roller can be 15-85 DEG C.In addition, the biaxial tension can use Synchronos method
Drawing process (carries out film longitudinal (MD) simultaneously and laterally (TD) is stretched), can also be using method of fractional steps drawing process (i.e. first
Film longitudinal stretching is carried out, then carries out film cross directional stretch).What the Synchronos method stretched specifically comprises the processes of: the slab is through filling
After point preheating, while the stretching of vertical and horizontal direction is carried out, wherein preheating temperature can be 75-165 DEG C, and draft temperature can be with
It is 75-160 DEG C, longitudinal stretching ratio >=4 times (MD), lateral stretching ratio >=5 times (TD), cross directional stretch rate >=50%/s.
What the method for fractional steps stretched specifically comprises the processes of: the slab first carries out longitudinal stretching after being fully warmed-up, and carries out lateral drawing later
It stretches, wherein preheating temperature can be 65-158 DEG C, and draft temperature can be 65-155 DEG C, longitudinal stretching ratio >=4 times (MD),
Laterally stretching ratio >=5 times (TD), cross directional stretch rate >=50%/s.In addition, can be without setting after film drawing and forming
Processing can also carry out annealing setting processing.When carrying out annealing setting processing, film setting treatment temperature can be 80-165
℃.Finally, film can also carry out surface corona processing, cutting edge and winding processing, microporous barrier of the present invention is finally obtained.
Microporous barrier provided by the invention has preferable film forming, and stretching ratio is big, rate of extension is high.It is drawn using flat membrane
During the method for stretching prepares microporous barrier, as described above, longitudinal stretching ratio >=4 times (MD), lateral stretching ratio >=5 times (TD).
Stretching ratio is bigger, then the mechanical strength of microporous barrier is higher.Transverse direction (TD) rate of extension >=50%/s of the microporous barrier, preferably
For 60-100%/s, can guarantee to industrialize continuous production in this way.
In addition, the thickness of microporous barrier provided by the invention can be 10-200 μm, preferably 10-100 μm.
The present invention will be described in detail by way of examples below.
In the following Examples and Comparative Examples:
Film biaxial tension equipment is purchased from Germany Br ü ckner company, model Karo IV.
The polyethylene composition and micropore film properties are tested in accordance with the following methods:
(1) molecular weight distributing index (Mw/Mn): using the PL-GPC 220 of Polymer Laboratories company of Britain
Type gel permeation chromatograph combination IR5 type infrared detector is measured, and chromatographic column is 3 series connection Plgel, 10 μm of MIXED-B
Column, solvent and mobile phase are 1,2,4- trichloro-benzenes, and column temperature is 150 DEG C, flow velocity 1.0mL/min, using the EasiCal of PL company
PS-1 Narrow distribution polystyrene standard specimen carries out universal calibration；
(2) it melt index (MI): is measured according to method specified in GB/T 3682-2000, wherein test temperature
It is 190 DEG C, load 2.16kg；
(3) it density: is measured according to method specified in GB/T 1033.2-2010 and using density gradient column method.
Embodiment 1
The present embodiment is for illustrating polyethylene composition and its microporous barrier provided by the invention.
(1) preparation of polyethylene composition:
Polyethylene composition provided in this embodiment is by component A, component B, component C, functional filler, lubricant and antioxygen
Agent composition, wherein component A, component B and component C are the linear low density polyethylene (LLDPE) of ethylene/alpha-olefin copolymerization, group
Dividing A and component B that metallocene catalyst is used to be prepared, (metallocene catalyst system is by CN102453124A embodiment
1 carried metallocene catalyst being prepared, similarly hereinafter), component C is prepared (described neat using Ziegler-Natta catalyst
Ge Le-natta catalyst systems are the ziegler-natta catalyst systems being prepared by CN101838351A embodiment 1, under
Together).Specific step is as follows:
By ethylene, alhpa olefin, hydrogen and nitrogen, (ethylene, alhpa olefin, hydrogen and nitrogen are polymer grade, after removing water, oxygen
Use, similarly hereinafter) it is added in gas fluidized bed reactor, catalyst system is then added, is 84-88 DEG C, presses in temperature later
Power polymerize under conditions of being 1.8-2.0MPa, respectively obtains component A, component B and component C.Wherein, component A, component B and component C
Melt index control by adjust hydrogen additional amount realize, density control by adjust alhpa olefin type and add
Enter amount and realizes.Alhpa olefin used is 1- hexene during preparing component A, and preparing alhpa olefin used during component B is 1-
Hexene, alhpa olefin used is 1- butylene during preparing component C.
Through detecting, the performance of component A prepared by the above method, component B and component C are as follows:
The melt index MI of component AA=1.5g/10min, density pA=0.913g/cm3, molecular weight distributing index Mw/Mn=
3.4, molar content=7.5mol% of alhpa olefin comonomer；
The melt index MI of component BB=2.1g/10min, density pB=0.913g/cm3, molecular weight distributing index Mw/Mn=
3.2, molar content=7.5mol% of alhpa olefin comonomer；
The melt index MI of component CC=15g/10min, density pC=0.905g/cm3, molecular weight distributing index Mw/Mn=
4.6, molar content=10.1mol% of alhpa olefin comonomer.
Each component obtained above is weighed and mixed according to the ratio, wherein the mass fraction W of component AAFor 80 weight
Part, the mass fraction W of component BBFor 10 parts by weight, the mass fraction W of component CCFor 20 parts by weight, WA/WC=4 (satisfaction 5.2 ×
lgMIA+11.6≥WA/WC≥0.9×lgMIA+ 2.1, also meet 2.9 × lgMIA+6.8≥WA/WC≥1.1×lgMIA+2.7)；
Then be added calcium carbonate (Jiangxi Huaming nanometer calcium carbonate Co., Ltd production, similarly hereinafter) that 100 parts by weight average grain diameters are 2 μm,
0.1 parts by weight lubricant (lubricant be Switzerland's Clariant Corporation production PEG lubricant, molecular weight 10000) and
(antioxidant is that antioxidant 1010 and irgasfos 168 are mixed according to what the weight ratio of 1:2 was mixed to get to the antioxidant of 0.3 parts by weight
Object is closed, similarly hereinafter), it adds mixture in high speed agitator and is uniformly mixed later, then the material mixed is added to W&P public affairs
It takes charge of in the feeder of the double screw extruder of manufacture, material enters in twin-screw via feeder, the temperature of screw rod in process
Degree be maintained between 160-210 DEG C, through screw rod melting mixing uniformly, squeeze out, be granulated and dry, obtain polyethylene composition grain
Material, is detected its melt index MI=2.4g/10min.
(2) preparation of polyethene microporous membrane:
Polyethylene composition pellet made from step (1) is dried, is added to the type of Labtech company of Sweden later
It, will curtain coating chilling roller during be cast slab number to carry out melting extrusion and being cast slab in the extrusion casting machine of LCR400
Temperature is set as 25 DEG C, and polyethylene micropore film thickness slab is made.
Above-mentioned polyethylene micropore film thickness slab is put into the stretching clamp of film biaxial tension equipment, using first longitudinal direction
(MD) the two-way step drawing technological forming that laterally (TD) is stretched after stretching, each step process condition are as follows: MD preheating temperature is 100
DEG C, MD draft temperature is 110 DEG C, and MD stretching ratio is 4 times；TD preheating temperature is 100 DEG C, and TD draft temperature is 115 DEG C, and TD is drawn
Stretching multiplying power is 5 times, and film TD rate of extension is 60%/s；Film setting temperature is 120 DEG C, and obtaining average thickness is 25 μm micro-
Pore membrane.
Embodiment 2
The present embodiment is for illustrating polyethylene composition and its microporous barrier provided by the invention.
(1) preparation of polyethylene composition:
Polyethylene composition provided in this embodiment is by component A, component B, component C, functional filler, lubricant and antioxygen
Agent composition, wherein component A, component B and component C are the linear low density polyethylene (LLDPE) of ethylene/alpha-olefin copolymerization, group
A and component B is divided to be prepared using metallocene catalyst, component C is prepared using Ziegler-Natta catalyst.Specific step
It is rapid as follows:
Ethylene, alhpa olefin, hydrogen and nitrogen are added in gas fluidized bed reactor, catalyst system is then added, it
It polymerize under conditions of temperature is 84-88 DEG C, pressure is 1.8-2.0MPa afterwards, respectively obtains component A, component B and component C.Its
In, the control of melt index of component A, component B and component C realize that the control of density is led to by adjusting the additional amount of hydrogen
Overregulate alhpa olefin type and additional amount and realize.Alhpa olefin used is 1- butylene during preparing component A, prepares component B
During alhpa olefin used be 1- butylene, preparing alhpa olefin used during component C is 1- hexene.
Through detecting, the performance of component A prepared by the above method, component B and component C are as follows:
The melt index MI of component AA=0.01g/10min, density pA=0.930g/cm3, molecular weight distributing index Mw/Mn
=3.0, molar content=1.6mol% of alhpa olefin comonomer；
The melt index MI of component BB=9.0g/10min, density pB=0.930g/cm3, molecular weight distributing index Mw/Mn=
2.8, molar content=1.9mol% of alhpa olefin comonomer；
The melt index MI of component CC=40g/10min, density pC=0.922g/cm3, molecular weight distributing index Mw/Mn=
4.4, molar content=4.0mol% of alhpa olefin comonomer.
Each component obtained above is weighed and mixed according to the ratio, wherein the mass fraction W of component AAFor 55 weight
Part, the mass fraction W of component BBFor 5 parts by weight, the mass fraction W of component CCFor 55 parts by weight, WA/WC=1 (satisfaction 5.2 ×
lgMIA+11.6≥WA/WC≥0.9×lgMIA+ 2.1, also meet 2.9 × lgMIA+6.8≥WA/WC≥1.1×lgMIA+2.7)；
Then the lubricant of calcium carbonate, 3 parts by weight that 100 parts by weight average grain diameters are 2 μm is added, and (lubricant is Switzerland's Clariant
Company production PEG lubricant, molecular weight 6000) and 0.3 parts by weight antioxidant, add mixture to high-speed stirring later
It mixes in device and is uniformly mixed, then the material mixed is added in the feeder for the double screw extruder that W&P company manufactures, material
Enter in twin-screw via feeder, the temperature of screw rod is maintained between 180-240 DEG C in process, through screw rod melting mixing
Uniformly, it squeezes out, be granulated and dry, obtain polyethylene composition pellet, detected its melt index MI=0.7g/10min.
(2) preparation of polyethene microporous membrane:
Polyethylene composition pellet made from step (1) is dried, is added to the type of Labtech company of Sweden later
It, will curtain coating chilling roller during be cast slab number to carry out melting extrusion and being cast slab in the extrusion casting machine of LCR400
Temperature is set as 85 DEG C, and polyethylene micropore film thickness slab is made.
Above-mentioned polyethylene micropore film thickness slab is put into the stretching clamp of film biaxial tension equipment, using first longitudinal direction
(MD) the two-way step drawing technological forming that laterally (TD) is stretched after stretching, each step process condition are as follows: MD preheating temperature is 130
DEG C, MD draft temperature is 126 DEG C, and MD stretching ratio is 4 times；TD preheating temperature is 130 DEG C, and TD draft temperature is 128 DEG C, and TD is drawn
Stretching multiplying power is 6 times, and film TD rate of extension is 100%/s；Film setting temperature is 130 DEG C, and obtaining average thickness is 25 μm
Microporous barrier.
Embodiment 3
The present embodiment is for illustrating polyethylene composition and its microporous barrier provided by the invention.
(1) preparation of polyethylene composition:
Polyethylene composition provided in this embodiment polymerize to obtain using multiple reactor shunting means shown in FIG. 1, wherein
The polymerization preparation of first reactor 1 component A, the polymerization preparation of second reactor 2 component B, the polymerization preparation component C of third reactor 3, this
Three kinds of components are the linear low density polyethylene (LLDPE) of ethylene/alpha-olefin copolymerization, wherein component A and component B is using cyclopentadienyl gold
Metal catalyst is prepared, and component C is prepared using Ziegler-Natta catalyst.Specific step is as follows:
Alhpa olefin, n-hexane and hydrogen are added in polymer reactor, and polymer reactor is heated to preset polymerization
Vinyl monomer and catalyst system are added in polymer reactor by temperature simultaneously later, and wherein component A and component B are in temperature
It polymerize under conditions of being 2.5MPa for 140 DEG C, pressure and obtains；Component C is under conditions of temperature is 240 DEG C, pressure is 14.8MPa
Polymerization obtains.The melt index of component A, component B and component C control by adjusting hydrogen additional amount realize, density
Control is realized by the type and additional amount for adjusting alhpa olefin.Alhpa olefin used is 1- octene, preparation during preparing component A
Alhpa olefin used is 1- butylene during component B, and preparing alhpa olefin used during component C is 1- butylene.
During the preparation process by the yield in unit time W of component A in first reactor 1A, component B in second reactor 2
Yield in unit time WBWith the yield in unit time W of component C in third reactor 3CWeight ratio maintain WA: WB: WC=75:2:
35, wherein WA/WC=2.1 (meet 5.2 × lgMIA+11.6≥WA/WC≥0.9×lgMIA+ 2.1, also meet 2.9 × lgMIA+
6.8≥WA/WC≥1.1×lgMIA+2.7)。
Through detecting, the performance of component A prepared by the above method, component B and component C are as follows:
The melt index MI of component AA=0.1g/10min, density pA=0.920g/cm3, molecular weight distributing index Mw/Mn=
3.1, molar content=2.1mol% of alhpa olefin comonomer；
The melt index MI of component BB=5.0g/10min, density pB=0.920g/cm3, molecular weight distributing index Mw/Mn=
3.5, molar content=5.1mol% of alhpa olefin comonomer；
The melt index MI of component CC=25g/10min, density pC=0.920g/cm3, molecular weight distributing index Mw/Mn=
4.2, molar content=5.7mol% of alhpa olefin comonomer.
Each component obtained above is respectively delivered to different solid-liquids (gas) separator 4 in yield in unit time ratio
Mutually separation is simultaneously transported in turn in the homogenization silo 5 with stirring for middle progress, average grain diameter is added according to the ratio then as 2 μm of carbon
Sour calcium, lubricant and antioxidant (in terms of being 100 parts by weight by the total weight of the component A, component B and component C, the use of calcium carbonate
Amount is 100 parts by weight, and the dosage of lubricant is 1 parts by weight, and the dosage of antioxidant is 0.3 parts by weight, and lubricant is U.S. Buddhist nun suddenly
The polyethylene wax of Wei Er company production) mixing homogenizing is carried out, the mixture that homogenized feed bin 5 is homogenized is added to W&P public affairs later
It takes charge of in the feeder of the double screw extruder of manufacture, material enters in twin-screw via feeder, the temperature of screw rod in process
Degree be maintained between 170-230 DEG C, through screw rod melting mixing uniformly, squeeze out, be granulated and dry, obtain polyethylene composition grain
Material, is detected its melt index MI=0.6g/10min.
(2) preparation of polyethene microporous membrane:
Polyethylene composition pellet made from step (1) is dried, is added to the type of Labtech company of Sweden later
It, will curtain coating chilling roller during be cast slab number to carry out melting extrusion and being cast slab in the extrusion casting machine of LCR400
Temperature is set as 35 DEG C, and polyethylene micropore film thickness slab is made.
Above-mentioned polyethylene micropore film thickness slab is put into the stretching clamp of film biaxial tension equipment, using first longitudinal direction
(MD) the two-way step drawing technological forming that laterally (TD) is stretched after stretching, each step process condition are as follows: MD preheating temperature is 116
DEG C, MD draft temperature is 118 DEG C, and MD stretching ratio is 4 times；TD preheating temperature is 120 DEG C, and TD draft temperature is 120 DEG C, and TD is drawn
Stretching multiplying power is 5 times, and film TD rate of extension is 100%/s；Film setting temperature is 122 DEG C, and obtaining average thickness is 25 μm
Microporous barrier.
Embodiment 4
The present embodiment is for illustrating polyethylene composition and its microporous barrier provided by the invention.
Polyethylene composition and microporous barrier are prepared according to the method for embodiment 1, unlike, the preparation process of component A
In each substance dosage it is different so that the density p of component A, component B and component CA、ρBAnd ρCBetween relationship be unsatisfactory for -0.04
≤ρA-ρB≤ 0.02 and -0.04≤ρA-ρC≤ 0.02, obtain the microporous barrier that average thickness is 25 μm.In the preparation of the component A
In the process, alhpa olefin is 1- hexene, and the performance of obtained component A is as follows: the melt index MI of component AA=1.5g/10min, it is close
Spend ρA=0.928g/cm3, molecular weight distributing index Mw/Mn=3.0, molar content=1.9mol% of alhpa olefin comonomer.
Comparative example 1
This comparative example is used to illustrate the polyethylene raw material and its microporous barrier of reference.
(1) polyethylene raw material:
Polyethylene raw material used in this comparative example is the film-grade linear low density polyethylene of U.S. DOW chemical company production
Alkene, trade mark ELITE 5400G, catalyst are metallocene catalyst, melt index MI=1.0g/10min, density p=0.916g/
cm3, molecular weight distributing index Mw/Mn=3.2.
(2) preparation of polyethene microporous membrane:
Polyethene microporous membrane is prepared according to the method for embodiment 3, unlike, by the polyethylene composition pellet phase
With the polyethylene raw material substitution of this comparative example step (1) of parts by weight, repeatedly attempted the case where stretching rupture of membranes occur, it can not
Stretch film forming.In addition, repeatedly being attempted still after the TD rate of extension in polyethene microporous membrane preparation process is down to 50%/s
There is the case where stretching rupture of membranes, film forming can not be stretched.
Comparative example 2
This comparative example is used to illustrate the polyethylene raw material and its microporous barrier of reference.
(1) polyethylene raw material:
Polyethylene raw material used in this comparative example is identical as comparative example 1.
(2) preparation of polyethene microporous membrane:
The polyethene microporous membrane of this comparative example using DR.COLLIN company of Germany the extrusion-blown modling of upper blowing method film blowing device at
Type obtains, and the specific method is as follows: the polyethylene raw material that above-mentioned steps (1) is chosen is added to upper blowing method film blowing device extruder
In hopper, raw material after the abundant fusion plastification of extruder, by head annular die extrusion melt membrane tube is made, after through compressing
Air inflation (blow-up ratio is 2.5 times), and the polyethene microporous membrane that average thickness is 25 μm is made after vane is cooling.
Comparative example 3
This comparative example is used to illustrate the polyethylene composition and its microporous barrier of reference.
(1) preparation of polyethylene composition:
The polyethylene composition that this comparative example provides is by component 1, component 2, functional filler, lubricant and antioxidant group
It is the linear low density polyethylene (LLDPE) of ethylene/alpha-olefin copolymerization at, wherein component 1 and component 2, component 1 is using cyclopentadienyl gold
Metal catalyst is prepared, and component 2 is prepared using Ziegler-Natta catalyst.Specific step is as follows:
Ethylene, alhpa olefin, hydrogen and nitrogen are added in gas fluidized bed reactor, catalyst system is then added, it
It polymerize under conditions of temperature is 84-88 DEG C, pressure is 1.8-2.0MPa afterwards, respectively obtains component 1 and component 2.Wherein, component
1 and the control of melt index of component 2 realize that the control of density passes through adjusting alhpa olefin by adjusting the additional amount of hydrogen
Type and additional amount and realize.Alhpa olefin used is 1- hexene during preparing component 1, prepares α used during component 2
Alkene is 1- butylene.
Through detecting, the performance of component 1 and component 2 prepared by the above method is as follows:
The melt index MI of component 11=5.0g/10min, density p1=0.913g/cm3, molecular weight distributing index Mw/Mn=
3.2, molar content=7.5mol% of alhpa olefin comonomer；
The melt index MI of component 22=15g/10min, density p2=0.905g/cm3, molecular weight distributing index Mw/Mn=
5.5, molar content=10.8mol% of alhpa olefin comonomer.
Each component obtained above is weighed and mixed according to the ratio, wherein the mass fraction W of component 11For 80 weight
Part, the mass fraction W of component 22For 20 parts by weight, W1/W2=4；Then the carbonic acid that 100 parts by weight average grain diameters are 2 μm is added
Calcium, 0.1 parts by weight lubricant (lubricant be Switzerland's Clariant Corporation production PEG lubricant, molecular weight 10000) with
And 0.3 parts by weight antioxidant, add mixture in high speed agitator and be uniformly mixed later, then the material mixed is added
In the feeder for entering the double screw extruder manufactured to W&P company, material enters in twin-screw via feeder, in process
The temperature of screw rod is maintained between 160-210 DEG C, through screw rod melting mixing uniformly, squeeze out, be granulated and dry, obtain polyethylene group
Object pellet is closed, its melt index MI=6.2g/10min is detected.
(2) preparation of polyethene microporous membrane:
The preparation of polyethene microporous membrane is carried out according to the method for embodiment 1, the results showed that, by repeatedly attempting, two-way drawing
The maximum tension multiplying power for stretching film is only 2 times (TD) × 2 times (MD), and film TD highest stretching ratio is only 10%/s, that is, is stretched
Multiplying power and rate of extension are too low, and stretching film forming is poor, do not have practicability.
Comparative example 4
This comparative example is used to illustrate the polyethylene composition and its microporous barrier of reference.
(1) preparation of polyethylene composition:
The polyethylene composition that this comparative example provides is by component 1, component 2, functional filler, lubricant and antioxidant group
It is the linear low density polyethylene (LLDPE) of ethylene/alpha-olefin copolymerization at, wherein component 1 and component 2, component 1 is using cyclopentadienyl gold
Metal catalyst is prepared, and component 2 is prepared using Ziegler-Natta catalyst.Specific step is as follows:
Ethylene, alhpa olefin, hydrogen and nitrogen are added in gas fluidized bed reactor, catalyst system is then added, it
It polymerize under conditions of temperature is 84-88 DEG C, pressure is 1.8-2.0MPa afterwards, respectively obtains component 1 and component 2.Wherein, component
1 and the control of melt index of component 2 realize that the control of density passes through adjusting alhpa olefin by adjusting the additional amount of hydrogen
Type and additional amount and realize.Alhpa olefin used is 1- butylene during preparing component 1, prepares α used during component 2
Alkene is 1- hexene.
Through detecting, the performance of component 1 and component 2 prepared by the above method is as follows:
The melt index MI of component 11=0.01g/10min, density p1=0.930g/cm3, molecular weight distributing index Mw/Mn
=2.8, molar content=1.8mol% of alhpa olefin comonomer；
The melt index MI of component 22=5.0g/10min, density p2=0.922g/cm3, molecular weight distributing index Mw/Mn=
4.5, molar content=4.9mol% of alhpa olefin comonomer.
Each component obtained above is weighed and mixed according to the ratio, wherein the mass fraction W of component 11For 55 weight
Part, the mass fraction W of component 22For 55 parts by weight, W1/W2=1；Then the carbonic acid that 100 parts by weight average grain diameters are 2 μm is added
Calcium, 0.1 parts by weight lubricant (lubricant be Switzerland's Clariant Corporation production PEG lubricant, molecular weight 6000) with
And 0.3 parts by weight antioxidant, add mixture in high speed agitator and be uniformly mixed later, then the material mixed is added
In the feeder for entering the double screw extruder manufactured to W&P company, material enters in twin-screw via feeder, in process
The temperature of screw rod is maintained between 180-240 DEG C, through screw rod melting mixing uniformly, squeeze out, be granulated and dry, obtain polyethylene group
Object pellet is closed, its melt index MI=0.22g/10min is detected.
(2) preparation of polyethene microporous membrane:
The preparation of polyethene microporous membrane is carried out according to the method for embodiment 2, the results showed that, by repeatedly attempting, two-way drawing
The maximum tension multiplying power for stretching film is only 2 times (TD) × 2 times (MD), and film TD highest stretching ratio is only 10%/s, that is, is stretched
Multiplying power and rate of extension are too low, and stretching film forming is poor, do not have practicability.
Test case
Test case is used to illustrate the test of polyethene microporous membrane and reference polyethylene micropore film properties.
(1) tensile strength and tension fracture elongation rate: being measured according to method specified in GB/T 1040.3-2006,
Acquired results are as shown in table 1；
(2) it puncture strength: is measured according to method specified in GB/T10004-2008, wherein sample thickness 25
± 5 μm, acquired results are as shown in table 1.
Table 1
It can be concluded that, polyethylene composition provided by the invention, Neng Goutong are used in embodiment 1-4 from the result in table 1
Cross biaxial tension and prepare polyethene microporous membrane, and compare with the microporous barrier using the preparation of existing method have film forming multiplying power greatly,
The advantage that rate of extension is fast, mechanical strength is high.It can be seen that from the comparison of embodiment 1 and embodiment 4 when the polyethylene composition
The density p of component A, component B and component C in objectA、ρBAnd ρCBetween relationship meet -0.04≤ρA-ρB≤ 0.02, and -0.04≤
ρA-ρCWhen≤0.02, which is prepared on the basis of with preferable film forming by the polyethylene composition
Microporous barrier tensile strength also with higher and punctured resistance.It can be seen that from embodiment 3 and the comparison of comparative example 1-2
Film forming can not be stretched using the commercial polyethylene raw material of prior art preparation, thus be not suitable for being added using Flat film strength
Work, and compared with the blow molding microporous barrier of the prior art, using the microporous barrier of Flat film strength machine-shaping mechanical strength and
Puncture strength is higher.In addition, can be seen that from the comparison of embodiment 1-4 and comparative example 3-4 using polyethylene provided by the invention
Composition has better filming performance, more prospects for commercial application as the raw material for preparing polyethene microporous membrane.
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above
Detail within the scope of the technical concept of the present invention can be with various simple variants of the technical solution of the present invention are made, this
A little simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, it can be combined in any appropriate way.In order to avoid unnecessary repetition, the present invention to it is various can
No further explanation will be given for the combination of energy.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (30)
1. a kind of polyethylene composition, which is characterized in that the polyethylene composition contains component A, component B, component C and function
It can property filler；The component A is the linear low density polyethylene of ethylene/alpha-olefin copolymerization, temperature is 190 DEG C, load is
Melt index MI under 2.16kgAFor 0.01-2g/10min, density pAFor 0.880-0.936g/cm3；The component B be ethylene/
The linear low density polyethylene of alhpa olefin copolymerization, the melt index MI in the case where temperature is 190 DEG C, load is 2.16kgBFor 2.1-
9.9g/10min, density pBFor 0.913-0.928g/cm3；The component C is the linear low density polyethylene of ethylene/alpha-olefin copolymerization
Alkene, the melt index MI in the case where temperature is 190 DEG C, load is 2.16kgCFor 10-80g/10min, density pCFor 0.905-
0.928g/cm3；
Wherein, the molecular weight distributing index of the component A and component B meets Mw/Mn≤ 4.5, and the molecular weight of the component C point
Cloth index meets Mw/Mn≤8.0。
2. polyethylene composition according to claim 1, wherein the total content with the component A, component B and component C is
100 parts by weight meters, the content of the functional filler are 50-300 parts by weight.
3. polyethylene composition according to claim 1, wherein the component A is temperature is 190 DEG C, load is
Melt index MI under 2.16kgAFor 0.01-1.5g/10min, the component B is in the case where temperature is 190 DEG C, load is 2.16kg
Melt index MIBFor 3-8g/10min, melt index MI of the component C in the case where temperature is 190 DEG C, load is 2.16kgCFor
10-60g/10min。
4. polyethylene composition according to claim 3, wherein the component A is temperature is 190 DEG C, load is
Melt index MI under 2.16kgAFor 0.01-1g/10min, the component B is in the case where temperature is 190 DEG C, load is 2.16kg
Melt index MIBFor 3-5g/10min, melt index MI of the component C in the case where temperature is 190 DEG C, load is 2.16kgCFor
15-40g/10min。
5. polyethylene composition according to claim 1, wherein the density p of the component AAFor 0.910-0.930g/
cm3。
6. polyethylene composition according to claim 5, wherein the density p of the component AAFor 0.915-0.926g/
cm3, the density p of the component BBFor 0.913-0.924g/cm3, the density p of the component CCFor 0.910-0.926g/cm3。
7. polyethylene composition according to claim 5, wherein component A, component B and group in the polyethylene composition
The density p of part CA、ρBAnd ρCBetween relationship meet -0.04≤ρA-ρB≤ 0.02, and -0.04≤ρA-ρC≤0.02。
8. polyethylene composition according to any one of claims 1-7, wherein in the polyethylene composition,
The mass fraction W of the component AAFor 25-90 parts by weight, the mass fraction W of the component BBFor 0.1-10 parts by weight, described group
Divide the mass fraction W of CCFor 10-75 parts by weight.
9. polyethylene composition according to claim 8, wherein in the polyethylene composition, the matter of the component A
Measure number WAFor 30-80 parts by weight, the mass fraction W of the component BBFor 0.5-8 parts by weight, the mass fraction W of the component CC
For 20-70 parts by weight.
10. polyethylene composition according to claim 8, wherein the mass fraction W of the component AAWith the quality of component C
Number WCWith the melt index MI of component AARelationship meet 5.2 × lgMIA+11.6≥WA/WC≥0.9×lgMIA+2.1。
11. polyethylene composition according to claim 10, wherein the mass fraction W of the component AAWith the matter of component C
Measure number WCWith the melt index MI of component AARelationship meet 2.9 × lgMIA+6.8≥WA/WC≥1.1×lgMIA+2.7。
12. polyethylene composition according to claim 10, wherein using the total weight of the polyethylene composition as base
Standard, the mass percentage content M of the component BB≤ 35 weight %.
13. polyethylene composition according to claim 12, wherein using the total weight of the polyethylene composition as base
Standard, the mass percentage content M of the component BB≤ 25 weight %.
14. polyethylene composition described in any one of -7,10 and 12 according to claim 1, wherein the polyethylene composition
Melt index of the object in the case where temperature is 190 DEG C, load is 2.16kg is 0.1-20g/10min.
15. polyethylene composition according to claim 14, wherein the polyethylene composition is 190 DEG C, carries in temperature
Melt index under lotus is 2.16kg is 0.5-10g/10min.
16. polyethylene composition according to any one of claims 1-7, wherein point of the component A and component B
Son amount profile exponent meets 2.0≤Mw/Mn≤ 4.2, and the molecular weight distributing index of the component C meets 3.5≤Mw/Mn≤
6.0。
17. polyethylene composition according to claim 16, wherein the component A and component B uses metallocene catalyst
Polymerization obtains, and the component C polymerize to obtain using Ziegler-Natta catalyst.
18. polyethylene composition according to any one of claims 1-7, wherein the component A, component B and component
The molar content of alhpa olefin comonomer is each independently 0.2-15mol% in C.
19. polyethylene composition according to claim 18, wherein alhpa olefin is total in the component A, component B and component C
The molar content of polycondensation monomer is each independently 1.5-10mol%.
20. polyethylene composition according to claim 18, wherein the alhpa olefin in the component A, component B and component C
It is each independently C3-C20At least one of alkene.
21. polyethylene composition according to claim 20, wherein the alhpa olefin in the component A, component B and component C
It is each independently propylene, 1- butylene, 2- butylene, 3-methyl-1-butene, 1- amylene, 3- Methyl-1-pentene, 4- methyl-1-pentene
Alkene, 3,3- dimethyl-1- amylene, 3,4- dimethyl-1- amylene, 4,4- dimethyl-1- amylene, 1- hexene, 4- methyl-1-oneself
Alkene, 5- methyl-1-hexene, 1- heptene, 2- heptene, 1- octene, 1- decene, 1- dodecylene, tetradecene, 16 carbon of 1-
At least one of alkene, 1- octadecene and 1- eicosylene.
22. polyethylene composition according to claim 21, wherein the alhpa olefin in the component A, component B and component C
It is each independently at least one of 1- butylene, 1- hexene and 1- octene.
23. polyethylene composition according to any one of claims 1-7, wherein the functional filler is averaged
Partial size is 0.05-10 μm.
24. polyethylene composition according to claim 23, wherein the functional filler is calcium carbonate, barium sulfate, two
Titanium oxide, talcum powder, zeolite, mica, clay, silica, diatomite, kaolin, alumina, calcium sulfate, magnesium sulfate, calcium oxide and oxygen
Change at least one of magnesium.
25. polyethylene composition according to any one of claims 1-7, wherein the polyethylene composition also contains
There is lubricant.
26. polyethylene composition according to claim 25, wherein with the total weight of the component A, component B and component C
For 100 parts by weight meters, the content of the lubricant is 0.05-5 parts by weight.
27. polyethylene composition according to claim 26, wherein the lubricant be selected from polyethylene glycol series lubricant agent,
Fluoropolymer series lubricant agent, organic silicon lubricant, fatty alcohol type emollients, fatty acid lubricant, fatty acid ester profit
Lubrication prescription, stearic amide series lubricant agent, fatty acid metal soaps lubricant, alkane and oxidation of alkanes series lubricant agent and the micro-nano grain of rice
At least one of subclass lubricant.
28. the microporous barrier that the polyethylene composition as described in any one of claim 1-27 is prepared.
29. microporous barrier according to claim 28, wherein the microporous barrier with a thickness of 10-200 μm.
30. microporous barrier according to claim 29, wherein the microporous barrier with a thickness of 10-100 μm.
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| CN102604194A (en) * | 2012-02-11 | 2012-07-25 | 常州市嘉鹏塑料制品有限公司 | Transparent electromagnetic shielding film |
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