CN1333123A - Method for making optical degrated biaxial stretching polypropylene film - Google Patents
Method for making optical degrated biaxial stretching polypropylene film Download PDFInfo
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Abstract
The production method of photodegradable biaxial stretching polypropylene film is characterized by that it makes the biaxial stretching polypropylene homogeneously polymerized and/or copolymer special-purpose resin undergo the processes of coextrusion and biaxial stretching treatment to obtain single-layer or multi-layer structure film. At the time of coextrusion, the extrusion temp. is 230-260 deg.C, the polypropylene special-purpose resin can be extruded into cast sheet, quenched at 10-40 deg.C, crystallized and solidifed into thick sheet, preheated at 120-145 deg.C, longitudinally-stretched, its extension ratio is 5.0-6.5 times, then thermal-formed at 100 deg.c-160 deg.c, then preheated at 140-175 deg.c, transverse-stretched at 130-180 deg.c, extension ratio is 6-10 times, and drawn and rolled in speed of 90-300 m/min.
Description
The present invention relates to a kind of manufacture method of optical degrated biaxial stretching polypropylene film.
Bidirectional stretching polypropylene film (abbreviating the BOPP film down as) is that recent two decades grows up, packaging material, printing as high-grade goods (as cigarette, food, medicine, clothes, audio-visual product etc.) are laminated with base material and coating adhesive tape base material etc., such film has transparency extremely clearly, glossiness and good barrier performance that light is bright-coloured, and suit the operation of process high speed such as packing, be coated with, be laminated with, have high economic worth, become new high-tech industry in the ascendant at present.But these commodity are after consumption, and the BOPP film will become scattered house refuse.Because polyacrylic strand is very big; being difficult to thoroughly degraded under field conditions (factors) rots; to pollute existent environment of people; exploitation light degradation BOPP film; for protection with to improve environment for human survival significant, so countries in the world are all classified degradation plastic film as the major fields of first developing the industrialization of new high-technology.Still lack patent and bibliographical information about light degradation BOPP film at present both at home and abroad, therefore, research and development light degradation BOPP thin film fabrication technology is very necessary.
On suitability for industrialized production, the linear velocity of producing the BOPP film is generally 10-15 times of agricultural inflation film, should make the BOPP film have the characteristic of degraded, keep its good optical property, thermal property and mechanical performance again, the technical difficulty of therefore making this class film is quite big.
The manufacture method that the purpose of this invention is to provide a kind of optical degrated biaxial stretching polypropylene film.
The invention provides a kind of optical degrated biaxial stretching polypropylene film and (comprise heat shrink films, heat sealed package film peace film) manufacture method, it is characterized in that using that homopolymerization of biaxial tension grade polypropylene and/or copolymerization are resin dedicated makes the single or multiple lift structural membrane through coextrusion and biaxial tension, when coextrusion, the resin dedicated extrusion temperature of polypropylene is extruded the casting sheet under 230-260 ℃ temperature, be solidified into sheet with 10-40 ℃ of quick cooling crystallization, preheating through 120-145 ℃, carry out longitudinal stretching at 80-135 ℃, draw ratio is 5.0-6.5 times, 100-160 ℃ of thermal finalization, enter before the cross directional stretch again preheating through 140-175 ℃, carry out cross directional stretch at 130-180 ℃ after the preheating, cross directional stretch is than being 6-10 times, with speed drawing and the rolling of 90-300m/min, making thickness is 12-50 μ m, light degradation reserved elongation at break＜5%, turbidity is 0.8%-2.5%, and glossiness is the environment-friendly type optical degrated biaxial stretching polypropylene film of 90%-98%.
In the method for the invention, described optical degrated biaxial stretching polypropylene heat shrink films and the employed biaxial tension grade polypropylene of heat sealed package film manufacturing technology PP Pipe Compound are meant Noblen, propylene copolymer, modified polypropene and the additive resin combination of (comprising sensitising agent, photosensitizing agent, antistatic additive, slip agent, antiplastering aid, stabilizing agent), the melt index of Noblen is 1.5-10.0 (being preferably 2.0-4.0) g/10min, mixes the core material as film with modified polypropene.The melt index of propylene copolymer is 3.0-10.0 (being preferably 4-7) g/10min, as the heat-sealable material on film top layer.
In the method for the invention, the employed biaxial tension grade polypropylene of the flat film manufacturing technology of described optical degrated biaxial stretching polypropylene PP Pipe Compound is meant the resin combination of Noblen and additive (comprising sensitising agent, photosensitizing agent, antistatic additive, antiplastering aid, stabilizing agent).The melt index of Noblen is 1.5-10.0 (being preferably 2.0-4.0) g/10min, as the core material and the skin-material of film.
In the method for the invention, the turbidity of prepared heat shrink films is 1.2%-1.9%, and glossiness is 92%-96%, and elastic modelling quantity is 2600-3000MPa, and vertically percent thermal shrinkage is 5%-10%, and laterally percent thermal shrinkage is 5%-10%.The turbidity of prepared heat sealed package film is 1.5%-2.5%, and glossiness is 92%-94%, and elastic modelling quantity is 2400-2800MPa, and vertically percent thermal shrinkage is 3%-5%, and laterally percent thermal shrinkage is 3%-5%, and heat seal strength is 2.5-3.5N/mm
2, prepared flat film turbidity is 0.8%-1.0%, and glossiness is 97%-98%, and wetting tension is 40-43mN/m, and the hot strength of vertical and horizontal is respectively 140-170MPa and 220-270MPa.
In the method for the invention, sensitising agent is meant alkyl ketone (preferably methyl vinyl ketone) and polyethylene or polyacrylic graft copolymer, and the consumption of alkyl ketone＜5% is preferably 1%-3%.
In the method for the invention, described photosensitizing agent is meant dialkyldithiocarbamacompositions iron, acetyl salicyl iron, ferric acetyl acetonade, and its consumption is 0.5%-3%, is preferably 1%-2%.
Key technical feature of the present invention is to select suitable sensitising agent and photosensitizing agent, realize the light degradation of bidirectional stretching polypropylene film and control photodegradative speed, need select corresponding technology simultaneously, just can produce both degradables, meet the BOPP film of high-grade goods packing, high-speed coating, presswork requirement again.Sensitising agent is alkyl ketone (being preferably methyl vinyl ketone) and polyethylene or polyacrylic graft copolymer, and the consumption of alkyl ketone＜5% is preferably 1-3%.Photosensitizing agent is dialkyldithiocarbamacompositions iron (being preferably N, N-dibutyl dithiocaarbamate iron), or acetyl salicyl iron, ferric acetyl acetonade, and consumption is 0.5-3% (being preferably 1-2%).Other compounding ingredient is the conventional plastic processing additives that is used for the BOPP film as modified polypropene, stabilizing agent, slip agent, antiplastering aid, antistatic additive.
Of the present invention can being undertaken by following steps:
1. sensitising agent and photosensitizing agent are mixed the hopper that the back adds BOPP film line metering mixed cell in the plastics stirring mixer.
2. resin material and other additives are added the special-purpose separately hopper of BOPP film line metering mixed cell, by the formula rate input proportioning parameter that designs.
3. adopt 230-260 ℃ extrusion temperature, with 10-40 ℃ of quick cooling crystallization, preheating temperature through 120-145 ℃, 5.0-6.5 draw ratio and 80-135 ℃ temperature longitudinal stretching doubly, again after 140-175 ℃ of preheating, with 6-10 times draw ratio and 130-180 ℃ temperature cross directional stretch, with the speed rolling of 90-300m/min.
In the selection of raw material, many sensitising agents process can't with the polypropylene copolymerization, go out at the polypropylene surface wash rice, can't make polypropylene molecular chain have photosensitive gene, and the powdery sensitising agent that goes out of wash rice damaged the surface quality of film, glossiness is reduced.After some sensitising agents and the polypropylene copolymerization, the degree of crystallinity of molecule is descended, the film turbidity of making increases, and transparency descends.When making heat-shrinkable film, owing in the time of sensitising agent and polypropylene copolymerization,, changed the molecule crosslinked structure of modified polypropene also with the modified polypropene copolymerization, the performance such as percent thermal shrinkage, elastic modelling quantity of the film that makes is suffered damage, do not reach specification requirement.For the photosensitizing agent that the control photodegradable speed adds, select also can not suppress at that time the migration of slip agent, antistatic additive, antiplastering aid, reduce its effect, the film that makes is difficult to obtain the favorable mechanical performance.Some photosensitizing agents and polyacrylic intermiscibility are bad, at Hybrid Heating coextrusion process skewness, are easy to generate spot and particle, destroy the appearance of films quality.Therefore needing to select melt index is that the propylene homopolymer of 1.5-10.0g/10min and copolymerization of propylene body that melt index is 3.0-10.0g/10min are as the PP Pipe Compound of making light degradation BOPP film.In the process that the raw material heat fused is extruded, light enhanced sensitivity additive often makes polypropylene generation degraded to a certain degree, too early degraded is unfavorable for obtaining good mechanical performance, and we take to add suitable stabilizing agent, has controlled the degraded of polypropylene under heating condition.Through a large amount of contrast experiments, we have invented the prescription that can satisfy above-mentioned multinomial basic demand simultaneously.
On the basis of carrying out orthogonal test, we have invented the new technology that is suitable for the production of light degradation BOPP thin film industry.
The objective of the invention is to research and develop the light degradation technology of BOPP film, and use this technology to realize the suitability for industrialized production of light degradation BOPP film, manufacturing is suitable for high-speed packaging, prints the high-grade film product that is laminated with and is coated with processing.It is characterized in that managing to control impact polypropylene molecule heat fused, mix, extrude, the principal element of crystallization, stretch orientation, type-approval process, obtain to be suitable for the properties of product of different purposes.As the molecular structure of raw material, additive and the change of proportioning, need suitable temperature conditions and draw ratio.In order to prevent molecule cracking and the coking and stop up runner of propylene homopolymer under excessive temperature, cause a series of problems such as film thickness fluctuation, the temperature that the propylene homopolymer is extruded casting sheet process need be controlled at 240-260 ℃, and the temperature that the copolymerization of propylene body is extruded casting sheet process is controlled at 230-250 ℃.For guaranteeing that acrylic resin has good heat endurance at the heating extrusion, need in acrylic resin, to add an amount of stabilizing agent, suppress acrylic resin in the thermal cracking of extruding casting sheet process.On the other hand, acrylic resin and various additive need to be mixed uniformly at extrusion, the temperature of acrylic resin extrusion is crossed when hanging down, its molten fluid viscosity is excessive, the distribution of additive in acrylic resin is just inhomogeneous, this directly influences the stable of properties of product, is characterized as the film thickness fluctuation greatly what drawing process showed, frequent rupture of membranes.Through adding hot-extrudable molten flow of casting, have three-decker, need cool off rapidly, obtain stable three-decker and grain through tiny and uniform crystalline solid with this, for the stretch orientation of crystalline solid molecule creates conditions, the chilling temperature be controlled at 10-40 ℃ more suitable.Longitudinal stretching needs to select between the softening point temperature of acrylic resin and melting temperature suitable temperature to carry out, and the acrylic resin of different size and dissimilar additive combinations all have its different softening points and fusing point.Can be as the fusing point of propylene homopolymer at 180 ℃, and the fusing point of copolymerization of propylene body can be at 125 ℃ or lower.The resin of different melting points has different surface viscosities, and the surface viscosity of resin is also different under different temperature, and the change of additive kind and addition also can change the surface viscosity of resin.Because being polypropylene diaphragm, longitudinal stretching the surperficial stretching that contacts is arranged with the letter of longitudinal stretching roller, the preheat temperature of stretching front diaphragm and draft temperature need be selected suitably, otherwise the problems such as abrading film surface of sliding roll banding can appear or, simultaneously, Zui Jia mechanical performance (as hot strength, elongation at break and elastic modelling quantity) must stretch under rational resin softening temperature and draw ratio and just can obtain.For the percent thermal shrinkage that obtains to expect, also need select suitable longitudinal stretching, setting temperature.We studies show that, 120-145 ℃ of preheating, 80-135 ℃ of stretching, draw ratio is 5.0-6.5 times, setting temperature is 100-160 ℃ and carries out longitudinal stretching, be respectively propylene homopolymer and the copolymerization of propylene body of 1.5-4.0g/10min, 3.0-10.0g/10min for melt index, can obtain favorable mechanical performance and thermal property.In the cross directional stretch process of acrylic resin, preheat temperature, draft temperature, heat setting temperature, draw ratio have determined the quality of horizontal mechanical performance of film and thermal property equally.We find from a large amount of experiments, ideal cross directional stretch preheat temperature is at 140-175 ℃, and draft temperature is at 130-180 ℃, and draw ratio is 6-10 times, the hauling speed of film and rolling speed can be in the scopes of 90-300m/min, and the thickness of making film can be 12-50 μ m.
With its light degradation reserved elongation at break＜5% of light degradation BOPP film that method of the present invention is made, glossiness 〉=97.7%, turbidity≤1.0%.
Specification of the present invention is intended briefly explaining advantage of the present invention and characteristics by following embodiment.Umber wherein is a weight portion, unless stated otherwise.
Embodiment one:
Select following prescription TS for use
1-01, TS
1-02 resin combination is made the light degradation BOPP heat-shrinkable film of 20 μ m, with the prescription S that does not add sensitising agent, photosensitizing agent
1-03 BOPP heat-shrinkable film that makes is done contrast test:
| The resin title | TS 1-01 | TS 1-02 | S 1-03 | |
| Top layer 1 | Propylene and ethylene EVA MFI=7.0g/10min) | 84 parts | 86 parts | 89 parts |
| The slip agent stearic amide | 10 parts | 10 parts | 10 parts | |
| Synthetic silicon antiplastering aid silica | 1 part | 1 part | 1 part | |
| The sensitising agent methyl vinyl ketone | 3 parts | 2 parts | - | |
| Photosensitizing agent N, N-dibutyl dithiocaarbamate iron | 2 parts | 1 part | - | |
| Sandwich layer | Propylene homopolymer MFI=3.0g/10min | 67 parts | 69 parts | 72 parts |
| Modified polypropene MFI=2.8g/10min | 25 parts | 25 parts | 25 parts | |
| The sensitising agent methyl vinyl ketone | 3 parts | 2 parts | - | |
| Photosensitizing agent N, N-dibutyl dithiocaarbamate iron | 2 parts | 1 part | - | |
| Stabilizing agent hydroxy phenyl acrylate | 1 part | 1 part | 1 part | |
| Antistatic additive ethyoxyl alkyl amine | 2 parts | 2 parts | 2 parts | |
| Top layer 2 | Copolymerization of propylene body MFI=7.0g/10min | 89 parts | 91 parts | 94 parts |
| The slip agent stearic amide | 5 parts | 5 parts | 5 parts | |
| Synthetic silicon antiplastering aid silica | 1 part | 1 part | 1 part | |
| The sensitising agent methyl vinyl ketone | 3 parts | 2 parts | - | |
| Photosensitizing agent N, N-butyl aminodithioformic acid iron | 2 parts | 1 part | - |
The BOPP film line that adopts German BRUCKNER company to make, fabric width 4.1-4.2M, linear velocity is 90-300M/MIN, hourly output is 500-1100KG.Experimental condition:
The process conditions more complicated of BOPP film line, the parameter 200 that relates to is multinomial, the following is relevant major parameter:
| Major parameter | Shrink film |
| (1) main extruder temperature | |
| Feeding zone (Zone1) | ????60℃ |
| Mixed zone (Zone2-4) | ????255℃ |
| Metering zone (Zone5-7) | ????250℃ |
| Filtering area (Zone8-9) | ????250℃ |
| (2) measuring pump temperature | ????- |
| (Zone10-12) | ????250℃ |
| (3) long-acting filter temperature | |
| (Zone13-17) | ????260℃ |
| (4) co-extrusion out-of-machine temperature | |
| Feeding zone (Zone1) | ????80℃ |
| Mixed zone (Zone2) | ????265℃ |
| Metering zone (Zone3) | ????260℃ |
| Compressional zone (Zone4) | ????255℃ |
| Filtering area (Zone5) | ????250℃ |
| (5) die head temperature | |
| (Zone1-5) | ????250℃ |
| (6) sharp cooling roll temperature | ????30℃ |
| (7) chilled water temperature | ????25℃ |
| (8) longitudinal stretching temperature | |
| Preheat roll 1 | ????128℃ |
| Preheat roll 2 | ????133℃ |
| Preheat roll 3 | ????136℃ |
| Draw roll (1-4) | ????95℃ |
| Draw roll (5-6) | ????103℃ |
| Setting roll | ????105℃ |
| Draw ratio | ????5.7 |
| (9) cross directional stretch temperature | |
| Preheating zone (1) | ????168℃ |
| Preheating zone (2) | ????162℃ |
| Drawing zone (3-4) | ????158℃ |
| Drawing zone (5) | ????166℃ |
| Heat set zone (6) | ????158℃ |
| (10) traction temperature | |
| Sided corona treatment voltage (1-2) | |
| (11) rolling | |
| Rolling tension force restriction proportion | ????30％ |
| Rolling pressure limit ratio | ????30％ |
| Rolling speed | ??100m/min |
Adopt every performance indications of the light degradation BOPP heat-shrinkable film that above-mentioned prescription makes as follows:
| Project | Unit | Index | Method of testing | ||
| ????TS 1-01 | ????TS 1-02 | ????S 1-03 | |||
| Thickness | μM | ????20.3 | ????20.2 | ????20.3 | ?DIN?53370 |
| Hot strength is vertical | MPa | ????199.9 | ????197.3 | ????198.2 | ?DIN?53456 |
| Elongation at break is vertical | ％ | ????108.5 | ????147.6 | ????136.3 | |
| Elastic modelling quantity | MPa | ????3077.8 | ????2529.1 | ????2763.2 | |
| The coefficient of kinetic friction | - | ????0.26 | ????0.22 | ????0.24 | ?ASTM?D1894 |
| Turbidity | ％ | ????2.3 | ????2.1 | ????2.2 | ?ASTM?D1003 |
| Glossiness | ％ | ????90.9 | ????90.2 | ????90.5 | ?ASTM?D2457 |
| Heat seal strength | N/15mm | ????3.2 | ????3.4 | ????3.3 | ?BMS?TT01 |
| Percent thermal shrinkage vertically/laterally | ％ | ????7.6/8.0 | ????7.3/7.8 | ????7.5/7.8 | ?BMS?TT02 |
| Light degradation elongation at break conservation rate vertically/laterally | ％ | ＜5% becomes broken | ＜5% becomes broken | ????40.9/74.8 | ?GB?9344 ?GB/T?1040 |
On show to show and show, with prescription TS
1-01, TS
1-02 light degradation BOPP heat-shrinkable film that makes, through artificial weathering aging test, vertical, horizontal elongation at break conservation rate all＜5% and does not add BOPP heat-shrinkable film contrast sample (the prescription S of sensitising agent, photosensitizing agent
1-03) after the artificial weathering aging test, 40.9%, 74.8% elongation at break conservation rate is arranged respectively vertically, laterally.
Embodiment two:
Select following prescription TP for use
1-01, TP
1-02, TP
1-03 resin combination is made the flat film of light degradation BOPP of 20 μ m, with the prescription P that does not add sensitising agent, photosensitizing agent
1The flat film of-04 BOPP that makes is done contrast test:
| The resin title | TP 1-01 | TP 1-02 | TP 1-03 | P 1-04 | |
| Top layer 1 | Propylene homopolymer MFI=3.0g/10min) | 92 parts | 94 parts | 95.5 part | 98 parts |
| Synthetic silicon antiplastering aid silica | 2 parts | 2 parts | 2 parts | 2 parts | |
| The sensitising agent methyl vinyl ketone | 3 parts | 2 parts | 1 part | - | |
| Photosensitizing agent N, N-dibutyl dithiocaarbamate iron | 2 parts | 1 part | 0.5 part | - | |
| Stabilizing agent hydroxy phenyl acrylate | 1 part | 1 part | 1 part | ||
| Sandwich layer | Propylene homopolymer MFI=3.0g/10min | 91 parts | 93 parts | 95.5 part | 97 parts |
| The sensitising agent methyl vinyl ketone | 3 parts | 2 parts | 2 parts | - | |
| Photosensitizing agent N, N-dibutyl dithiocaarbamate iron | 2 parts | 1 part | 0.5 part | - | |
| Stabilizing agent hydroxy phenyl acrylate | 1 part | 1 part | 1 part | - | |
| Antistatic additive ethyoxyl alkyl amine | 3 parts | 3 parts | 3 parts | 3 parts | |
| Top layer 2 | Propylene homopolymer MFI=3.0g/10min | 93 parts | 95 parts | 95.5 part | 97 parts |
| Synthetic silicon antiplastering aid silica | 2 parts | 2 parts | 2 parts | 2 parts | |
| The sensitising agent methyl vinyl ketone | 3 parts | 2 parts | 1 part | - | |
| Photosensitizing agent N, N-dibutyl dithiocaarbamate iron | 2 parts | 1 part | 0.5 part | - | |
| Stabilizing agent hydroxy phenyl acrylate | 1 part | 1 part | 1 part |
The BOPP film line that adopts German BRUCKNER company to make, fabric width 4.1-4.2M, linear velocity is 90-300M/MIN, hourly output is 500-1100KG.Experimental condition:
The process conditions more complicated of BOPP film line, the parameter 200 that relates to is multinomial, the following is relevant major parameter:
| Major parameter | Flat film |
| (1) main extruder temperature | |
| Feeding zone (Zone1) | ????60℃ |
| Mixed zone (Zone2-4) | ????255℃ |
| Metering zone (Zone5-7) | ????250℃ |
| Filtering area (Zone8-9) | ????250℃ |
| (2) measuring pump temperature | |
| (Zone10-12) | ????250℃ |
| (3) long-acting filter temperature | |
| (Zone13-17) | ????260℃ |
| (4) co-extrusion out-of-machine temperature | |
| Feeding zone (Zone1) | ????80℃ |
| Mixed zone (Zone2) | ????265℃ |
| Metering zone (Zone3) | ????260℃ |
| Compressional zone (Zone4) | ????255℃ |
| Filtering area (Zone5) | ????250℃ |
| (5) die head temperature | |
| (Zone1-5) | ????250℃ |
| (6) sharp cooling roll temperature | ????30℃ |
| (7) chilled water temperature | ????25℃ |
| (8) longitudinal stretching temperature | |
| Preheat roll 1 | ????128℃ |
| Preheat roll 2 | ????133℃ |
| Preheat roll 3 | ????136℃ |
| Draw roll (1-4) | ????129℃ |
| Draw roll (5-6) | ????129℃ |
| Setting roll | ????150℃ |
| Draw ratio | ????5.0 |
| (9) cross directional stretch temperature | |
| Preheating zone (1) | ????174℃ |
| Preheating zone (2) | ????168℃ |
| Drawing zone (3-4) | ????161℃ |
| Drawing zone (5) | ????175℃ |
| Heat set zone (6) | ????175℃ |
| (10) traction temperature | |
| Sided corona treatment voltage (1-2) | ????11.5KV |
| (11) rolling parameter | |
| Rolling tension force restriction proportion | ????68％ |
| Rolling pressure limit ratio | ????68％ |
| Rolling speed | ????110m/min |
Adopt every performance indications of the flat film of light degradation BOPP that above-mentioned prescription makes as follows:
| Project | Unit | Index | Method of testing | |||
| TP 1-01 | TP 1-02 | TP 1-03 | P 1-04 | |||
| Thickness | μM | 20.0 | 20.0 | 20.0 | 20.0 | ?DIN53370 |
| Hot strength vertically/laterally | MPa | 156.7/293.9 | 158.6/293.7 | 154.9/297.8 | 157.1/295.6 | ?DIN53456 |
| Elongation at break vertically/laterally | ％ | 146.0/61.4 | 149.0/61.7 | 144.8/65.0 | 145.0/62.1 | |
| Young's modulus (elastic modelling quantity) | MPa | 2378.5 | 2302.0 | 2173.4 | 2216 | |
| The coefficient of kinetic friction | - | 0.45 | 0.46 | 0.46 | 0.45 | ?ASTM ?D1894 |
| Turbidity | ％ | 1.0 | 1.0 | 1.0 | 1.1 | ?ASTM ?D1003 |
| Glossiness | ％ | 97.7 | 97.6 | 97.7 | 96.2 | ?ASTM ?D2457 |
| Wetting tension | mN/m | 41 | ?41 | 41 | ?41 | ?ASTM ?D2578 |
| Percent thermal shrinkage vertically/laterally | ％ | 3.2/1.3 | 3.1/1.3 | 3.2/1.3 | 3.1/1.3 | ?BMS ?TT02 |
| Light degradation elongation at break conservation rate vertically/laterally | ％ | ＜5% becomes broken | ＜5% becomes broken | ＜5% becomes broken | 56.7/60.8 | ?GB?9344 ?GBT1040 |
On show to show and show, with prescription TP
1-01, TP
1-02, TP
1-03 flat film of light degradation BOPP that makes, through artificial weathering aging test, vertical, horizontal extension at break conservation rate all＜5% and does not add the flat film contrast of BOPP sample (the prescription P of sensitising agent, photosensitizing agent
1-04) after the artificial weathering aging test, 56.7%, 60.8% elongation at break conservation rate is arranged respectively vertically, laterally.
Claims (10)
1. method of making optical degrated biaxial stretching polypropylene film, it is characterized in that using that homopolymerization of biaxial tension grade polypropylene and/or copolymerization are resin dedicated makes the single or multiple lift structural membrane through coextrusion and biaxial tension, when coextrusion, the resin dedicated extrusion temperature of polypropylene is extruded the casting sheet under 230-260 ℃ temperature, be solidified into sheet with 10-40 ℃ of quick cooling crystallization, preheating through 120-145 ℃, carry out longitudinal stretching at 80-135 ℃, draw ratio is 5.0-6.5 times, 100-160 ℃ of thermal finalization, enter before the cross directional stretch again preheating through 140-175 ℃, carry out cross directional stretch at 130-180 ℃ after the preheating, cross directional stretch is than being 6-10 times, with speed drawing and the rolling of 90-300m/min;
Wherein, described biaxial tension grade polypropylene PP Pipe Compound is meant Noblen, propylene copolymer, modified polypropene and comprises the resin combination of the additive of sensitising agent, photosensitizing agent, antistatic additive, slip agent, antiplastering aid and stabilizing agent, the melt index of Noblen is 1.5-10.0g/10min, mix core material as film with modified polypropene, the melt index of propylene copolymer is 3.0-10.0g/10min, as the heat-sealable material on film top layer.
2. in accordance with the method for claim 1, wherein, the melt index of described Noblen is 2.0-4.0g/10min, and the melt index of described propylene copolymer is 4-7g/10min.
3. in accordance with the method for claim 1, wherein said optical degrated biaxial stretching polypropylene film is heat shrink films, heat sealed package film or flat film.
4. the method for claim 1, wherein, employed biaxial tension grade polypropylene PP Pipe Compound is meant Noblen and comprises the resin combination of the additive of sensitising agent, photosensitizing agent, antistatic additive, antiplastering aid and stabilizing agent, the melt index of Noblen is 1.5-10.0g/10min, as the core material and the skin-material of film.
5. in accordance with the method for claim 4, wherein, the melt index of described Noblen is 2.0-4.0g/10min.
6. method as claimed in claim 3, wherein, the turbidity of prepared heat shrink films is 1.2%-1.9%, glossiness is 92%-96%, elastic modelling quantity is 2600-3000MPa, and vertically percent thermal shrinkage is 5%-10%, and laterally percent thermal shrinkage is 5%-10%, the turbidity of prepared heat sealed package film is 1.5%-2.5%, glossiness is 92%-94%, and elastic modelling quantity is 2400-2800MPa, and vertically percent thermal shrinkage is 3%-5%, laterally percent thermal shrinkage is 3%-5%, and heat seal strength is 2.5-3.5N/mm
2, prepared flat film turbidity is 0.8%-1.0%, and glossiness is 97%-98%, and wetting tension is 40-43mN/m, and the hot strength of vertical and horizontal is respectively 140-170MPa and 220-270MPa.
7. in accordance with the method for claim 1, wherein sensitising agent is alkyl ketone and polyethylene or polyacrylic graft copolymer, the consumption of alkyl ketone＜5%.
8. in accordance with the method for claim 5, wherein, described alkyl ketone is a methyl vinyl ketone, and its consumption is 1%-3%.
9. in accordance with the method for claim 1, wherein photosensitizing agent is dialkyldithiocarbamacompositions iron, acetyl salicyl iron and/or ferric acetyl acetonade, and its consumption is 0.5%-3%.
10. in accordance with the method for claim 7, wherein, the consumption of described photosensitizing agent is 1%-2%.
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| CN 00109848 CN1124928C (en) | 2000-07-11 | 2000-07-11 | Method for making optical degrated biaxial stretching polypropylene film |
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| CN 00109848 CN1124928C (en) | 2000-07-11 | 2000-07-11 | Method for making optical degrated biaxial stretching polypropylene film |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2007003085A1 (en) * | 2005-06-30 | 2007-01-11 | Byd Company Limited | A process for preparing a microporous polyolefin membrane |
| CN101531082B (en) * | 2009-03-10 | 2011-03-16 | 安徽国风塑业股份有限公司 | BOPP thin film for shallow reticulated printing |
| CN102218869A (en) * | 2011-03-23 | 2011-10-19 | 河北洋浦包装材料有限公司 | Packaging film |
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