CN103331973B - The low temperature resistant anti-impact type cast polypropylene film of resistance to boiling - Google Patents
The low temperature resistant anti-impact type cast polypropylene film of resistance to boiling Download PDFInfo
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- CN103331973B CN103331973B CN201310209289.3A CN201310209289A CN103331973B CN 103331973 B CN103331973 B CN 103331973B CN 201310209289 A CN201310209289 A CN 201310209289A CN 103331973 B CN103331973 B CN 103331973B
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Abstract
A kind of low temperature resistant anti-impact type cast polypropylene film of resistance to boiling, be composited by corona layer, sandwich layer and hot sealing layer, described sandwich layer is between corona layer, hot sealing layer; Described corona layer is made up of polypropylene block copolymer resins, and described sandwich layer is made up of polypropylene block copolymer resins 70-90%, thermoplastic elastomer (TPE) 10-30% and mustard acyl acid amide slipping agent 0.2%; Described hot sealing layer material is made up of polypropylene block copolymer 89.7%, ethylene-alpha-olefin copolymer 10%, synthetic wollastonite antitack agent 0.15% and mustard acyl acid amide slipping agent 0.15%.Patent of the present invention has that resistance to low temperature is excellent, impact strength is large, puncture resistance is good, and also have the advantage of resistance to boiling, the mode by pasteurization or poach carries out sterilization treatment simultaneously.This film, mainly for the packaging of goods needing refrigeration, has the characteristics such as cold-resistant freezing, puncture resistant, shock resistance.Therefore the plastic flexible package needing deepfreeze and sterilization treatment can be widely used in.
Description
Technical field
The present invention relates to a kind of polypropylene film of resistance to boiling, especially a kind of low temperature resistant anti-impact type cast polypropylene film of resistance to boiling.
Background technology
In plastic flexible package application, because some packing articles will carry out deepfreeze, some is packaged in application process and can runs into different ambient temperature conditions in addition, especially winter temperature difference can be very large, temperature as the north is reduced to about-30 DEG C sometimes, in this case, some packing articles shock resistance will be deteriorated because of black brittleness.Now just there will be various problem: 1, the impact resistance of sack is poor, transport, handling, shelf put the destruction being easily subject to external power in process, very easily there is broken bag, open a bag phenomenon, not only affect the outward appearance of packaging product, the due effect of packaging itself can not be played simultaneously.2, the cold resistance of frozen food does not reach requirement, and when temperature is lower, can not keep the original performance of material, packaging material are more crisp, packaging material mechanical strength is declined, causes packaging bag to break and ftracture, and more can not meet the protective effect to content.3, the puncture resistance of packaging bag, frozen food freezing rear be generally harder, particularly fish, meat products, containing bone and hard objects, transport and stack in product extruding be easy to packaging bag is worn out, packaging bag sealing is damaged, and therefore frozen food requires very high to the puncture of packaging bag.
The now commercially common following structure of the many employings of Frozen Food Packaging composite membrane: the properties of product of this structure of OPP/LLDPE can reach moistureproof, cold-resistant, low-temperature heat-sealing pulling force is strong, and cost is relatively economic; The packaging character of this structure of NY/LLDPE can resistance to freezing, shock-resistant, puncture, and cost is relatively high, packing of product better performances; And PET/LLDPE structure also has use in freezing series products, but utilization rate is relatively low; Also having a kind of is in addition simple PE bag, such as vegetables packaging etc.; Above several prods structure is that the cryogenic freezing packing of product of present domestic market uses the structure relatively concentrated.
In above-mentioned packaging, employing be LLDPE as hot sealing layer material, but due to the transparency of LLDPE poor, and because fusing point and the lower boiling resistance of Vicat softening point can be also poor.Therefore pack for the goods that visualization requirements is high and need the packaging for foodstuff of water boiling resistance or resistance to boiling sterilization, adopting LLDPE film will there is certain limitation.
Summary of the invention
The object of the invention is to provide a kind of low temperature resistant anti-impact type cast polypropylene film of resistance to boiling, adopts LLDPE as hot sealing layer material to solve existing Frozen Food Packaging composite membrane, fusing point and Vicat softening point lower, boiling resistance can the technical problem such as poor.
The present invention is mainly solved the problems of the technologies described above by following technical proposals: a kind of low temperature resistant anti-impact type cast polypropylene film, is composited by corona layer, sandwich layer and hot sealing layer, it is characterized in that described sandwich layer is between corona layer, hot sealing layer; Described corona layer is made up of polypropylene block copolymer resins, and described sandwich layer is made up of polypropylene block copolymer resins 70%, thermoplastic elastomer (TPE) 29.8% and erucamide slip agent 0.2%; Described hot sealing layer material is polypropylene block copolymer 89.7%, ethylene-alpha-olefin copolymer 10%, synthetic wollastonite antitack agent 0.15% and erucamide slip agent 0.15% forms.
As preferably, described corona layer, sandwich layer and hot sealing layer three layer by layer thickness rate are 1:3:1.
As preferably, described thermoplastic elastomer (TPE) is polyethylen-octene elastomer, ethene and the 2-butene elastomer mixture that forms of 2:1 in mass ratio altogether.
As preferably, described polypropylene block copolymer can be one or more combinations of HOPP resin, acrylic resin copolymer, copolymerization and HOPP resin.
As preferably, described synthetic wollastonite antitack agent is made up of the polypropylene of 90%, the blended granulation of wollastonite of 10%.
As preferably, described erucamide slip agent is made up of the polypropylene of 95%, the blended granulation of erucyl amide of 5%.
As preferably, described corona layer surface, after high-frequency discharge process, obtains the sided corona treatment value that moistened surface tension force is greater than 38 dyne.
In the present invention, the polyethylen-octene elastomer that elastomer and the mixing of ethene-2 butene elastomer obtain altogether is contributed larger to the low-temperature impact performance of material, this is because play connection, cushioning effect between each composition of elastomer, make system play dispersion when being subject to impacting, shock absorbing can, reduce crazing because of the stressed chance developing into crackle, thus improve the impact strength of system.When system is subject to tension force, can there is larger deformation in the network-like structure formed due to these tie-points, so the elongation at break of system has significant increase, shock resistance strengthens.
Anti-blocking agent can form many projections or different the concavo-convex of shape that relax on the surface of finished films, the surface of finished films is made to reach certain roughness, like this finished films stack or roll up put together time, can allow between each thin layer and retain a certain amount of air, thus effective contact area between minimizing film, reach the effect preventing film blocking.
Slipping agent is dispersed in plastic sheeting by melt extruding, and finally can migrate to film surface fast in production with in using, form a smooth layer, reduce the coefficient of friction of film surface, make it not adhesion mutually, order unreels and cuts more smooth and easy, and has good Kekelé structure count.
Patent of the present invention has that resistance to low temperature is excellent, impact strength is large, puncture resistance is good, and also have the advantage of resistance to boiling, the mode by pasteurization or poach carries out sterilization treatment simultaneously.This film, mainly for the packaging of goods needing refrigeration, has the characteristics such as cold-resistant freezing, puncture resistant, shock resistance.Therefore the plastic flexible package needing deepfreeze and sterilization treatment can be widely used in.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Detailed description of the invention
Below by embodiment, technical scheme of the present invention is described in further detail.Fig. 1 is structural representation of the present invention, as shown in the figure, this low temperature resistant anti-impact type cast polypropylene film of resistance to boiling, is composited by corona layer 1, sandwich layer 2 and hot sealing layer 3, its sandwich layer 2 is between corona layer 1, hot sealing layer 3, and corona layer, sandwich layer and hot sealing layer three layer by layer thickness rate is 1:3:1.
embodiment 1:this low temperature resistant anti-impact type cast polypropylene film of resistance to boiling, its corona layer is made up of polyproplyene block copolymer resins; Sandwich layer gathers resin 70% by polyproplyene block copolymerization, thermoplastic elastomer (TPE) (polyethylen-octene is elastomer, ethene and the 2-butene elastomer mixture that forms of 2:1 in mass ratio altogether) 29.8% and erucamide slip agent (polypropylene of 95%, the blended granulation of high-purity erucyl amide of 5% are made, lower together) 0.2% forms; Hot sealing layer is made up of polypropylene block copolymer 89.7%, ethylene-alpha-olefin copolymer 10%, synthetic wollastonite antitack agent (polypropylene of 90%, the blended granulation of the wollastonite of 10% are made, lower same) 0.15%, erucamide slip agent 0.15%.Above-mentioned trilaminate material carries out melting respectively through three single screw extrusion machines, then carries out film forming through the cooling of block of ingredient connector, T-shaped die head co-extrusion and curtain coating.Product follow-up through cooling and shaping, Thickness sensitivity, sided corona treatment, rolling, Ageing Treatment, cut and pack, obtain final products.In above embodiment, corona layer surface, after high-frequency discharge process, obtains the sided corona treatment value that moistened surface tension force is greater than 38 dyne.
embodiment 2:this low temperature resistant anti-impact type cast polypropylene film of resistance to boiling, its corona layer is made up of boiling level propylene binary random vinyl chloride; Sandwich layer is made up of polypropylene homo resin 79.8%, thermoplastic elastomer (TPE) (polyethylen-octene is elastomer, ethene and the 2-butene elastomer mixture that forms of 2:1 in mass ratio altogether) 20% and erucamide slip agent 0.2%; Hot sealing layer is made up of polypropylene binary random copolymer 89.7%, ethylene-alpha-olefin copolymer 10%, synthetic wollastonite antitack agent 0.15%, erucamide slip agent 0.15%.Above-mentioned trilaminate material carries out melting respectively through three single screw extrusion machines, then carries out film forming through the cooling of block of ingredient connector, T-shaped die head co-extrusion and curtain coating.Product follow-up through cooling and shaping, Thickness sensitivity, sided corona treatment, rolling, Ageing Treatment, cut and pack, obtain final products.In above embodiment, corona layer surface, after high-frequency discharge process, obtains the sided corona treatment value that moistened surface tension force is greater than 38 dyne.
embodiment 3:this low temperature resistant anti-impact type cast polypropylene film of resistance to boiling, its corona layer is made up of boiling level propylene binary random vinyl chloride; Sandwich layer is made up of polypropylene homo resin 89.8%, thermoplastic elastomer (TPE) (polyethylen-octene is elastomer, ethene and the 2-butene elastomer mixture that forms of 2:1 in mass ratio altogether) 10% and erucamide slip agent 0.2%; Hot sealing layer is made up of polypropylene terpolymer 89.7%, ethylene-alpha-olefin copolymer 10%, synthetic wollastonite antitack agent 0.15%, erucamide slip agent 0.15%.Above-mentioned trilaminate material carries out melting respectively through three single screw extrusion machines, then carries out film forming through the cooling of block of ingredient connector, T-shaped die head co-extrusion and curtain coating.Product follow-up through cooling and shaping, Thickness sensitivity, sided corona treatment, rolling, Ageing Treatment, cut and pack, obtain final products.In above embodiment, corona layer surface, after high-frequency discharge process, obtains the sided corona treatment value that moistened surface tension force is greater than 38 dyne.
embodiment 4:this low temperature resistant anti-impact type cast polypropylene film of resistance to boiling, its corona layer is made up of boiling level propylene binary random vinyl chloride; Sandwich layer is made up of polypropylene binary copolymerization resin 80%, thermoplastic elastomer (TPE) (polyethylen-octene is elastomer, ethene and the 2-butene elastomer mixture that forms of 2:1 in mass ratio altogether) 19.8% and erucamide slip agent 0.2%; Hot sealing layer is made up of polypropylene terpolymer 89.7%, ethylene-alpha-olefin copolymer 10%, synthetic wollastonite antitack agent 0.15%, erucamide slip agent (polypropylene of 95%, the blended granulation of high-purity erucyl amide of 5% are made) 0.15%.Above-mentioned trilaminate material carries out melting respectively through three single screw extrusion machines, then carries out film forming through the cooling of block of ingredient connector, T-shaped die head co-extrusion and curtain coating.Product follow-up through cooling and shaping, Thickness sensitivity, sided corona treatment, rolling, Ageing Treatment, cut and pack, obtain final products.In above embodiment, corona layer surface, after high-frequency discharge process, obtains the sided corona treatment value that moistened surface tension force is greater than 38 dyne.
Raw material of the present invention is all that market is buied, and is mainly selected from DOW Chemical (DOW), E.I.Du Pont Company (DUPONT), Basel (BASELL), Mitsui Chemicals (MITSUICHEMICALS), section rise the renowned company such as (KRATON), Samsung Dao Daer (SUMSUNGTOTAL), Exxon (EXXON), Constant general (CONSTAB).The twin-screw granulating extruder related in embodiment adopts the equipment of Nanjing Jie Ente company, and coextrusion casting equipment adopts Austrian Lenzin company (i.e. SML company) three-layer co-extruded curtain coating production line.
comparative example:this low temperature resistant anti-impact type cast polypropylene film of resistance to boiling, its corona layer is made up of boiling level propylene binary random vinyl chloride; Sandwich layer is made up of polypropylene homo resin 99.8% and erucamide slip agent 0.2%; Hot sealing layer is made up of polypropylene terpolymer 89.7%, ethylene-alpha-olefin copolymer 10%, synthetic wollastonite antitack agent 0.15%, erucamide slip agent 0.15%.Above-mentioned trilaminate material carries out melting respectively through three single screw extrusion machines, then carries out film forming through the cooling of block of ingredient connector, T-shaped die head co-extrusion and curtain coating.Product follow-up through cooling and shaping, Thickness sensitivity, sided corona treatment, rolling, Ageing Treatment, cut and pack, obtain final products.
The item following points that production process of the present invention pays particular attention to: one, the dust impurities of raw material controls: raw material is from spice to conveying, require to carry out under air-proof condition, isolate with the curtain coating workshop of extruding of film between storage workshop and spice skip car, avoid the dust of raw material to enter casting unit; Two, crystalline substance point and the charing point control of process is melt extruded: every platform extruder and die head connector have filter, filter is to adopt the mode of cascade filtration for the best, filter divides coarse filtration and essence to filter two sections, thus avoids brilliant some charing point to wait impurity to enter die head to greatest extent; Three, deflector roll requires: casting unit to the deflector roll that rolling unit is all needs through special surface treatment; Four, workshop environmental requirement: production process requires to carry out in dust-free workshop inside, workshop degree of purification requires more than 1000 grades, wherein require from curtain coating cooling unit to rolling unit to adopt poly (methyl methacrylate) plate to isolate, production operation personnel need to dress special garment for clean room, headgear and mouth mask as far as possible; Five, film dividing mode: the mode of cutting is taked to cut online, unreels the infringement of process to film when avoiding film secondary to cut.Six, the process of heating crystalline again of film: needed a heating and cooling device to heat again film before rolling, heating-up temperature 50 DEG C-100 DEG C, its objective is to accelerate film recrystallization, reduce the film curing time, thus polymer molecular chain is fully extended sizing, avoid rolling rear film to shrink distortion.
In order to verify effect of the present invention, the finished product that each embodiment and comparative example obtain is carried out contrast test, and its result is as following table:
Result of the test shows: the present invention's low temperature resistant anti-impact type cast polypropylene film of resistance to boiling mainly contains following feature: 1. elastic modelling quantity is large, and deflection is high, and its elastic modelling quantity and hot strength are all greater than general thin; 2. initial heat-sealing temperature is low; 3. glossiness is fine, and mist degree is excellent, and the properties of transparency of product is better; 4. low temperature impact strength is high, and the scope of application is wide.
Claims (1)
1. a low temperature resistant anti-impact type cast polypropylene film, is composited by corona layer, sandwich layer and hot sealing layer, it is characterized in that described sandwich layer is between corona layer, hot sealing layer; Described corona layer is made up of polypropylene block copolymer resins, and described sandwich layer is made up of polypropylene block copolymer resins 70%, thermoplastic elastomer (TPE) 29.8% and erucamide slip agent 0.2%; Described hot sealing layer material is polypropylene block copolymer 89.7%, ethylene-alpha-olefin copolymer 10%, synthetic wollastonite antitack agent 0.15% and erucamide slip agent 0.15% forms; Described corona layer, sandwich layer and hot sealing layer three layer by layer thickness rate are 1:3:1; Described thermoplastic elastomer (TPE) is polyethylen-octene altogether elastomer, ethene and the 2-butene elastomer mixture that forms of 2:1 in mass ratio; Described synthetic wollastonite antitack agent is made up of the polypropylene of 90%, the blended granulation of wollastonite of 10%; Described erucamide slip agent is made up of the polypropylene of 95%, the blended granulation of erucyl amide of 5%; Described corona layer surface, after high-frequency discharge process, obtains the sided corona treatment value that moistened surface tension force is greater than 38 dyne.
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| CN201310209289.3A CN103331973B (en) | 2013-01-15 | 2013-05-31 | The low temperature resistant anti-impact type cast polypropylene film of resistance to boiling |
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| 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 |
| 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 |
| CN109466147A (en) * | 2018-12-28 | 2019-03-15 | 大连盛林薄膜新材料有限公司 | A kind of thermophilic digestion type cast polypropylene film |
| CN110948986A (en) * | 2019-12-16 | 2020-04-03 | 嘉兴鹏翔包装材料有限公司 | Agricultural high-toughness VMCPP aluminum-plated film and preparation method thereof |
| CN111361255A (en) * | 2020-04-07 | 2020-07-03 | 深圳日高胶带新材料有限公司 | Environment-friendly automotive interior adhesive tape |
| CN113752599A (en) * | 2021-06-21 | 2021-12-07 | 徐州宏恩包装新材料有限公司 | High-temperature cooking film for food packaging and preparation method thereof |
| CN115139615B (en) * | 2022-08-25 | 2023-06-06 | 河北泰达包装材料有限公司 | Flexible package modified CPP film and production method thereof |
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| CN101367280A (en) * | 2008-07-22 | 2009-02-18 | 黄山永新股份有限公司 | Antifreezing speed-sealing film and preparation method thereof |
| CN202293553U (en) * | 2011-11-04 | 2012-07-04 | 任丘市京开塑业有限公司 | Flexibility-enhanced type thin film resistant to low temperature freezing refrigeration and high temperature steaming |
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| JPS58175635A (en) * | 1982-04-08 | 1983-10-14 | Asahi Chem Ind Co Ltd | Highly stretched multilayered film and manufacture thereof |
| JP4471193B2 (en) * | 2003-08-20 | 2010-06-02 | 東セロ株式会社 | Heat-fusible propylene polymer laminated film and use thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101367280A (en) * | 2008-07-22 | 2009-02-18 | 黄山永新股份有限公司 | Antifreezing speed-sealing film and preparation method thereof |
| CN202293553U (en) * | 2011-11-04 | 2012-07-04 | 任丘市京开塑业有限公司 | Flexibility-enhanced type thin film resistant to low temperature freezing refrigeration and high temperature steaming |
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Denomination of invention: Low temperature and impact resistant cast polypropylene cooking resistant film Effective date of registration: 20220119 Granted publication date: 20160427 Pledgee: Bank of China Limited Xiantao branch Pledgor: Hubei Huishi Plastics Industry Co.,Ltd. Registration number: Y2022420000019 |