CN106364093A - Casting polypropylene film and preparation method thereof - Google Patents

Casting polypropylene film and preparation method thereof Download PDF

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Publication number
CN106364093A
CN106364093A CN201610735815.3A CN201610735815A CN106364093A CN 106364093 A CN106364093 A CN 106364093A CN 201610735815 A CN201610735815 A CN 201610735815A CN 106364093 A CN106364093 A CN 106364093A
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CN
China
Prior art keywords
polypropylene
cast
film
outer layer
polypropylene film
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610735815.3A
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Chinese (zh)
Inventor
贺爱忠
沈均平
晁承鹏
陈涛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SHANGHAI ZITENG PACKAGING MATERIAL CO Ltd
Original Assignee
SHANGHAI ZITENG PACKAGING MATERIAL CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SHANGHAI ZITENG PACKAGING MATERIAL CO Ltd filed Critical SHANGHAI ZITENG PACKAGING MATERIAL CO Ltd
Priority to CN201610735815.3A priority Critical patent/CN106364093A/en
Publication of CN106364093A publication Critical patent/CN106364093A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—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
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/12—Polypropene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/16—Applications used for films

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

The invention provides casting polypropylene film and a preparation method thereof. The casting polypropylene film is characterized in that a polypropylene outer layer, a polypropylene core layer and a polypropylene heat sealing layer are included, and the polypropylene core layer is arranged between the polypropylene outer layer and the polypropylene heat sealing layer. The casting polypropylene film does not contain fisheyes of which the area is larger than or equal to 1 mm<2>. According to the casting polypropylene film and the preparation method thereof, a charging device with a vacuumizing or nitrogen sealing function and a secondary filtration technology are adopted, the temperature difference between the core layer and the other two layers is established during formula design, a processing aid or a combination of multiple processing aids is added, therefore, the generation reasons of the fisheyes are overcome from multiple aspects, the purpose of producing the three-layer co-extrusion casting polypropylene film with few fisheyes is achieved, and the casting polypropylene film can be applied to various high-requirement industrial packaging.

Description

A kind of cast polypropylene film and preparation method thereof
Technical field
The present invention relates to two kinds of three-layer co-extruded cast polypropylene films, the three-layer co-extruded cast polypropylene of particularly a kind of low fisheye Film and preparation method thereof.
Background technology
Cast polypropylene film is a kind of heat-sealable material using widely, generally for cast polypropylene when therefore processing The heat sealability concern of film is relatively more.But current cast polypropylene film also has increasingly been used for protecting film, self-adhesive film, aluminum The exigent industrial packaging field such as plastic film, the application of these types is for the fisheye producing in the cast polypropylene course of processing There is higher requirement, typically require low fisheye even no fisheye.
Content of the invention
It is an object of the invention to provide a kind of cast polypropylene film of low fisheye and preparation method thereof.
In order to achieve the above object, the invention provides a kind of cast polypropylene film is it is characterised in that include outside polypropylene Layer, polypropylene core and polypropylene thermal sealing, described polypropylene core between outer layer of polypropylene and polypropylene thermal sealing, Outer layer of polypropylene, polypropylene core and polypropylene thermal sealing are combined with each other.
Preferably, described cast polypropylene film does not contain area and is more than or equal to 1mm2Fisheye.
Preferably, the fusing point of described polypropylene core is high compared with outer layer of polypropylene and polypropylene thermal sealing.
Preferably, the fusing point of described outer layer of polypropylene is 100-140 DEG C, and thickness is 5-20 μm, polypropylene core molten Point is 140-180 DEG C, and thickness is 15-80 μm, 100-140 DEG C of the fusing point of polypropylene thermal sealing, and thickness is 5-20 μm.
Preferably, the thickness of described cast polypropylene film is at 25-100 μm.
Present invention also offers the preparation method of above-mentioned cast polypropylene film is it is characterised in that include:
Step 1: the raw material acrylic resin of outer layer of polypropylene, polypropylene core and polypropylene thermal sealing is passed through respectively three The charge door of individual extruder adds, and carries out fusion plastification by the heating extruding of extruder to polypropylene；
Step 2: the melt polypropylene after plasticizing is adopted the drainage screen group of the drainage screen composition of 3-6 piece 20-400 mesh, with And the disc-type accurate filter filtering video disc composition of 20-100 piece is filtered twice；
Step 3: the melt polypropylene after filtering is cast out from the die head of extruder, the polypropylene melt of polypropylene core 2 Body, between the melt polypropylene and the melt polypropylene of polypropylene thermal sealing 3 of outer layer of polypropylene, is cooled into through chilling roller Thin film forms cast polypropylene film.
Preferably, fed using the feeding device with evacuation or nitrogen gas seal equipment in described step, To discharge air and the vapor being mixed in acrylic resin.
Preferably, in described step in plasticizing process, in outer layer of polypropylene, polypropylene core and polypropylene thermal sealing Acrylic resin in add other raw materials of this layer.
It is highly preferred that described other raw materials include ppa (fluoropolymer additive), antioxidant, slipping agent, open One of processing aids such as mouth agent, ultraviolet absorber, UV stabilizer and antistatic additive or several combination.
Compared with prior art, the invention has the beneficial effects as follows:
By the present invention in that with evacuation or nitrogen-sealed feeding device, secondary filter technique, setting in formula Sandwich layer and the temperature difference of other two-layer are set up in timing, and add the combination of one or more processing aid, improve brilliant from many aspects Point Producing reason, to reach the three-layer co-extruded cast polypropylene film producing low fisheye it is adaptable to the industry of various high request Packaging applicationss.
Brief description
Fig. 1 is cast polypropylene membrane structure schematic diagram.
Specific embodiment
With reference to specific embodiment, the present invention is expanded on further.It should be understood that these embodiments are merely to illustrate the present invention Rather than restriction the scope of the present invention.In addition, it is to be understood that after having read the content of present invention instruction, people in the art Member can make various changes or modifications to the present invention, and these equivalent form of values equally fall within the application appended claims and limited Scope.
Embodiment
As shown in figure 1, described cast polypropylene film, including the heat-sealing of outer layer of polypropylene 1, polypropylene core 2 and polypropylene Layer 3, described polypropylene core 2 between outer layer of polypropylene 1 and polypropylene thermal sealing 3, outer layer of polypropylene 1, polypropylene cores Layer 2 and polypropylene thermal sealing 3 are combined with each other, described outer layer of polypropylene 1, polypropylene core 2 and polypropylene thermal sealing 3 molten Point is 134 DEG C, 160 DEG C and 134 DEG C.The thickness ratio of described outer layer of polypropylene 1, polypropylene core 2 and polypropylene thermal sealing 3 is 1: 4: 1, gross thickness is 60 μm.
The thickness of described outer layer of polypropylene 1 is 10 μm, and its raw material is: the HOPP tf400 of Samsung, The antioxidant of ppa (fluoropolymer additive) ppa-3s and polytechs (Bao Lide) of polytechs (Bao Lide) Ay-3, weight is than for tf400: ppa-3s: ay-3=97: 1: 2.
The thickness of described polypropylene core 2 is 40 μm, and its raw material is: the HOPP hf400 of Samsung, The compound opening slipping agent sab- of antioxidant ay-3, polytechs (Bao Lide) of polytechs (Bao Lide) 7238pp, weight is than for hf400: ay-3: sab-7238pp=97: 2: 1.
The thickness of described polypropylene thermal sealing 3 is 10 μm, and its raw material is: the HOPP tf400 of Samsung, The antioxidant of ppa (fluoropolymer additive) ppa-3s, polytechs (Bao Lide) of polytechs (Bao Lide) The compound opening slipping agent sab-7238pp of ay-3, polytechs (Bao Lide), weight is than for tf400: ppa-3s: ay-03 : sab-7238pp=95: 1: 2: 2.
Process equipment is the 4.3m three-layer co-extrusion tape casting machine that Mitsubishi heavy industry Co., Ltd. produces.
The preparation method of described cast polypropylene film is:
(1) polypropylene in the raw material of outer layer of polypropylene 1, polypropylene core 2 and polypropylene thermal sealing 3 is passed through respectively three The charge door of individual extruder adds, and discharges the air being mixed in resin particle, vapor etc. by nitrogen gas seal equipment during charging Gas, these gases can cause resin oxidation, crosslinked and form fisheye in processing.
(2) fusion plastification is carried out to polypropylene by the heating extruding of extruder, wherein, the processing temperature of outer layer of polypropylene 1 Spend and be: extruder temperature is followed successively by 180/210/245/245/245/245 DEG C；The processing temperature of polypropylene core 2 is: extruder Temperature is followed successively by 180/210/230/260/260/260/260/260 DEG C；The processing temperature of polypropylene thermal sealing 3 is: extruder Temperature is followed successively by 180/210/245/245/245/245 DEG C.
In plasticizing process, press each layer formula respectively and add the other raw materials in addition to polypropylene, wherein, the antioxidant of addition Ay-3 can prevent resin from aoxidizing at high temperature under high pressure, crosslinked generation fisheye, and ppa-3s can reduce resin and extruder metal watch The time of contact in face, prevent from leading to hot-spot rear oxidation, crosslinked generation brilliant in metal surface length time of contact during Plastic Point, ppa-3s can also produce lubrication in interlaminar resin together with compound opening slipping agent sab-7238pp, so that resin is subject to Thermoplastification evenly, prevents hot-spot.
(3) each layer polypropylene melt having plastified first passes through the mistake of four drainage screen compositions of 100/200/400/100 purpose Filter screen group carries out coarse filtration to the fisheye producing in processing, removes area 1mm2Above fisheye, for ensureing the effectiveness of drainage screen, Often produce needs to change a drainage screen for 24 hours.Wherein, 245 DEG C of the drainage screen temperature of outer layer of polypropylene 1, extruder and filtration 250 DEG C of the temperature of the connecting portion between net；260 DEG C of the drainage screen temperature of polypropylene core 2, the company between extruder and drainage screen 260 DEG C of socket part temperature；245 DEG C of the drainage screen temperature of polypropylene thermal sealing 3, the temperature of the connecting portion between extruder and drainage screen 250℃；
(4) video disc forming through the filtration video disc being 40 μm of aperture by 50 filtering accuracies again through the polypropylene of coarse filtration Formula accurate filter carries out fine straining, removes area 0.1mm2Above fisheye, for ensureing filter effect, disc-type filter is often given birth to Produce and must change for 8 hours, if run into also must change during the filter screen replacement of coarse filtration simultaneously, outer layer of polypropylene 1, polypropylene cores The temperature of the filtration video disc of layer 2 and polypropylene thermal sealing 3 is respectively 240 DEG C, 250 DEG C and 240 DEG C.
(5) melt polypropylene after fine straining is cast out from the die head of extruder, and die head temperature is all 225 DEG C, through one The chilling roller of the diameter 600mm at 28 ± 3 DEG C for the chilling temperature is cooled into thin film, outer layer of polypropylene 1 and polypropylene thermal during cooling The polypropylene tf400 that sealing 3 uses, because directly contact air or chilling roller can preferentially cool down, and the polypropylene hf400 of sandwich layer Cooling can be delayed, because the polypropylene rf401 fusing point of sandwich layer is higher, and the thickness of sandwich layer distribution accounts for the 80% of gross thickness, cold The outer layer that substantial amounts of heat can be relatively low to cooled fusing point can be discharged when but and heat-sealing layer polypropylene tf400 heats again, And form secondary crystallization in the presence of chilling roller, to form less crystal grain, it is to avoid the fisheye of the too big formation of crystalline particle.
The cast polypropylene film parent roll produced is being provided with isra photograph detection after cutting into the wide son volume of 500mm System checking machine on examine product, camera minimum resolution is 0.14mm, you can to detect that area is more than (0.14/2)2* 3.14mm2=0.015mm2Fisheye, volume 8 son volume often rolling up 2000 meters after testing, statistical average often rolls up fisheye number: fisheye area More than or equal to 1mm2Fisheye number≤0/volume, fisheye area is in 0.1mm2-1mm2Between fisheye number≤5/volume, fisheye face Amass and be less than 0.1mm2Fisheye number≤40/volume.And conventionally produced cast polypropylene film, under identical inspection product parameter Inspection product data statisticss result be: fisheye area be more than or equal to 1mm2Fisheye number 12/volume, fisheye area is in 0.1mm2-1mm2 Between fisheye number 80/volume, fisheye area be less than 0.1mm2Fisheye number 1800/volume.

Claims (9)

1. a kind of cast polypropylene film is it is characterised in that include outer layer of polypropylene (1), polypropylene core (2) and polypropylene heat-sealing Layer (3), described polypropylene core (2) between outer layer of polypropylene (1) and polypropylene thermal sealing (3), outer layer of polypropylene (1), polypropylene core (2) and polypropylene thermal sealing (3) are combined with each other.
2. cast polypropylene film as claimed in claim 1 is more than or equal to 1mm it is characterised in that not containing area2Fisheye.
3. cast polypropylene film as claimed in claim 1 is it is characterised in that the fusing point of described polypropylene core (2) is more poly- Propylene outer layer (1) and polypropylene thermal sealing (3) are high.
4. cast polypropylene film as claimed in claim 1 is it is characterised in that the fusing point of described outer layer of polypropylene (1) is 100-140 DEG C, thickness is 5-20 μm, and the fusing point of polypropylene core (2) is 140-180 DEG C, and thickness is 15-80 μm, polypropylene thermal The fusing point 100-140 degree of sealing (3), thickness is 5-20 μm.
5. cast polypropylene film as claimed in claim 1 is it is characterised in that the thickness of described cast polypropylene film is in 25- 100μm.
6. the preparation method of the cast polypropylene film any one of claim 1-5 is it is characterised in that include:
Step 1: the raw material acrylic resin of outer layer of polypropylene 1, polypropylene core 2 and polypropylene thermal sealing 3 is passed through respectively three The charge door of individual extruder adds, and carries out fusion plastification by the heating extruding of extruder to polypropylene；
Step 2: the melt polypropylene after plasticizing is adopted the drainage screen group of the drainage screen composition of 3-6 piece 20-400 mesh, and 20- The disc-type accurate filter filtering video disc composition of 100 is filtered twice；
Step 3: the melt polypropylene after filtering is cast out from the die head of extruder, the melt polypropylene of polypropylene core 2 sets Between the melt polypropylene and the melt polypropylene of polypropylene thermal sealing 3 of outer layer of polypropylene 1, it is cooled into thin film through chilling roller Form cast polypropylene film.
7. the preparation method of cast polypropylene film as claimed in claim 6 is it is characterised in that using band in described step 1 There are evacuation or the feeding device of nitrogen gas seal equipment to be fed, steamed with discharging the air being mixed in acrylic resin and water Gas.
8. the preparation method of cast polypropylene film as claimed in claim 6 is it is characterised in that in plasticizing in described step 1 During, add other of this layer former in the acrylic resin of outer layer of polypropylene 1, polypropylene core 2 and polypropylene thermal sealing 3 Material.
9. the preparation method of cast polypropylene film as claimed in claim 8 is it is characterised in that described other raw materials include One of ppa, antioxidant, slipping agent, opening agent, ultraviolet absorber, UV stabilizer and antistatic additive or several groups Close.
CN201610735815.3A 2016-08-26 2016-08-26 Casting polypropylene film and preparation method thereof Pending CN106364093A (en)

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CN201610735815.3A CN106364093A (en) 2016-08-26 2016-08-26 Casting polypropylene film and preparation method thereof

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Application Number Priority Date Filing Date Title
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107757032A (en) * 2017-11-02 2018-03-06 上海紫江新材料科技有限公司 A kind of ultrathin aluminum plastic film polypropylene screen and preparation method thereof
CN107933025A (en) * 2017-11-02 2018-04-20 上海紫江新材料科技有限公司 A kind of cast polypropylene film and preparation method thereof
CN110505960A (en) * 2017-03-28 2019-11-26 东洋纺株式会社 Biaially oriented polypropylene based resin film
CN112760053A (en) * 2020-12-16 2021-05-07 苏州绍荣光学科技有限公司 Preparation process of CPP (chlorinated Polypropylene) protective film for conductive film

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000211627A (en) * 1999-01-26 2000-08-02 Toppan Printing Co Ltd Retort-sterilizable paper container
CN103203933A (en) * 2013-03-23 2013-07-17 湖北慧狮塑业股份有限公司 Low-temperature-resistant impact-resistant CPP (cast polypropylene) cooking-resistant film

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000211627A (en) * 1999-01-26 2000-08-02 Toppan Printing Co Ltd Retort-sterilizable paper container
CN103203933A (en) * 2013-03-23 2013-07-17 湖北慧狮塑业股份有限公司 Low-temperature-resistant impact-resistant CPP (cast polypropylene) cooking-resistant film

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110505960A (en) * 2017-03-28 2019-11-26 东洋纺株式会社 Biaially oriented polypropylene based resin film
CN110505960B (en) * 2017-03-28 2022-05-10 东洋纺株式会社 Biaxially oriented polypropylene resin film
CN107757032A (en) * 2017-11-02 2018-03-06 上海紫江新材料科技有限公司 A kind of ultrathin aluminum plastic film polypropylene screen and preparation method thereof
CN107933025A (en) * 2017-11-02 2018-04-20 上海紫江新材料科技有限公司 A kind of cast polypropylene film and preparation method thereof
CN112760053A (en) * 2020-12-16 2021-05-07 苏州绍荣光学科技有限公司 Preparation process of CPP (chlorinated Polypropylene) protective film for conductive film

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Application publication date: 20170201