CN109278389B - Coating-free biaxially oriented polypropylene cold seal base film and preparation method thereof - Google Patents
Coating-free biaxially oriented polypropylene cold seal base film and preparation method thereof Download PDFInfo
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- CN109278389B CN109278389B CN201811166465.9A CN201811166465A CN109278389B CN 109278389 B CN109278389 B CN 109278389B CN 201811166465 A CN201811166465 A CN 201811166465A CN 109278389 B CN109278389 B CN 109278389B
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
- B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
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- 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
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- 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
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0008—Electrical discharge treatment, e.g. corona, plasma treatment; wave energy or particle radiation
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Thermal Sciences (AREA)
- Laminated Bodies (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
Abstract
The invention discloses a coating-free biaxially oriented polypropylene cold seal base film and a preparation method thereof, wherein the cold seal base film consists of an outer surface layer, a core layer and an inner surface layer, and the surface layer consists of 1-10% of antistatic master batch, 10-80% of modified polypropylene and the balance of homopolymerized polypropylene; the modified polypropylene is prepared by mixing the following components in percentage by mass: 1-30% of tetrafluoroethylene-perfluoropropyl vinyl ether copolymer and the balance of polypropylene; the inner surface layer consists of the following components in percentage by mass: 1-5% of antistatic master batch, 1-3% of anti-blocking master batch, 3-10% of linear low-density polyethylene, 1-10% of ethylene-propylene-butadiene ternary copolymer master batch and the balance of homopolymerized polypropylene. The outer surface layer is added with tetrafluoroethylene-perfluoropropyl vinyl ether copolymer, so that a silicon-based release layer is not required to be coated, and the cold seal base film can be directly used. The coating process is reduced, and the production efficiency is greatly improved; and reduces the production cost.
Description
Technical Field
The invention relates to the technical field of films, in particular to a coating-free biaxially oriented polypropylene cold seal base film and a preparation method thereof.
Background
The european soft packaging industry appeared at the end of the 20 th century with the cold seal technology inspired by self-adhesive envelopes, which was first applied in chocolate production. With the continuous expansion of the application range, the packaging bag can also be used for packaging heat-sensitive products and medical supplies.
Cold sealing is a sealing temperature of the cold sealing material of typically 20-40 c, and the heat sealing material of typically more than 80 c, relative to heat sealing. The cold sealing packaging technology has many advantages, such as low peculiar smell and no pollution of the cold sealing film, and can be directly contacted with food, thereby avoiding the damage to the contents caused by high temperature; the production efficiency is high, and the packaging speed is 5-6 times of that of heat-sealing packaging; the sealed package has moderate sealing strength; compared with heat sealing package, it saves material and energy.
The cold seal film is a new product and a new technology, the used biaxially oriented polypropylene base film also belongs to a product with high added value, and the market prospect is wide.
However, when the common biaxially oriented polypropylene film is used for cold sealing a substrate, a silicon-based release material needs to be coated on the outer surface so as to prevent the adverse situation of colloid residue from occurring when cold sealing glue is stripped, and the production efficiency of the cold sealing film is influenced by the coating process.
Disclosure of Invention
In order to avoid the defects of the prior art, the invention aims to provide a coating-free biaxially oriented polypropylene cold seal base film and a preparation method thereof.
A coating-free biaxially oriented polypropylene cold seal base film is composed of an outer surface layer, a core layer and an inner surface layer, wherein the outer surface layer is composed of the following components in percentage by mass: 1-10% of antistatic master batch, 10-80% of modified polypropylene and the balance of homopolymerized polypropylene;
the modified polypropylene is prepared by mixing the following components in percentage by mass: 1-30% of tetrafluoroethylene-perfluoropropyl vinyl ether copolymer and the balance of polypropylene;
the inner surface layer consists of the following components in percentage by mass: 1-5% of antistatic master batch, 1-3% of anti-blocking master batch, 3-10% of linear low-density polyethylene, 1-10% of ethylene-propylene-butadiene ternary copolymer master batch and the balance of homopolymerized polypropylene.
Further, the thickness of the outer surface layer is 0.8-2.5 μm, and the thickness of the inner surface layer is 1.2-3.0 μm. The thickness of the outer surface layer and the inner surface layer of the base film is set, so that the base film has excellent printing performance and release effect.
According to a further scheme, the anti-blocking master batch is prepared by mixing the following components in percentage by mass: 3-10% of amorphous silicon dioxide, 3-10% of spherical glass beads and the balance of homo-polypropylene.
The specific anti-blocking master batch can ensure that the surface roughness of the film is more suitable for shallow screen printing, the printing effect is better, and the cold sealing adhesive has better composite fastness.
Preferably, the particle size of the amorphous silicon dioxide is 4.5-5.5 μm, and the particle size of the spherical glass beads is 3-4 μm.
In the further scheme, the ethylene chain segment accounts for 1-8 wt% of the ethylene-propylene-butadiene ternary copolymer master batch, the butadiene chain segment accounts for 5-10 wt% of the ethylene-propylene-butadiene ternary copolymer master batch, and the balance is the propylene chain segment.
The ethylene-propylene-butadiene ternary copolymer master batch with the structure is selected, so that the cold sealing adhesive force of the film and the film is stronger when the cold sealing adhesive is coated on the film.
In a further scheme, the core layer consists of the following components in percentage by mass: 1-10% of antistatic master batch and the balance of homopolymerized polypropylene.
Preferably, the antistatic master batch is a mixture of at least two of glycerin monostearate, fatty acid polyglycol ester, N-dihydroxyethyl octadecylamine and fatty alcohol polyether amide and homopolymerized polypropylene. The antistatic master batch can enable the film to have excellent quick-acting and long-acting antistatic effects at the same time.
The invention also aims to provide a preparation method of the coating-free biaxially oriented polypropylene cold seal base film, which comprises the following steps:
(1) conveying the core layer material to a double-screw extruder according to a ratio, heating and melting at 240-260 ℃, removing water vapor and small molecular impurities in the raw material through a vacuum filtration system, and forming a core layer melt through a 400-mesh candle core type filter;
respectively adding the components of the outer surface layer and the inner surface layer into two double-screw extruders, melting, vacuumizing to remove moisture and impurities, and passing through a 250-mesh flat filter to form an outer surface layer melt and an inner surface layer melt;
(2) sequentially adding the outer surface layer melt, the core layer melt and the inner surface layer melt into a three-layer structure die head, converging and extruding to obtain a membrane, and attaching the membrane to a chill roll at the temperature of 20-40 ℃ by using a patch air knife to quench and form a cast sheet;
(3) longitudinally stretching the cast sheet into a thick sheet, wherein the preheating temperature is 120-140 ℃, the stretching temperature is 130-135 ℃, and the stretching ratio is 4.5-4.8 times;
(4) feeding the longitudinally stretched sheet into a transverse drawing box, wherein the preheating temperature is 170-180 ℃, the drawing temperature is 150-155 ℃, the setting area is 160-170 ℃, the drawing ratio is 9-9.5 times, and the retraction ratio is 1.6-2.5%;
(5) the film enters a traction system for flattening through air cooling, and the inner surface of the film is subjected to corona treatment and is wound; then the finished product is prepared by cutting and packaging after aging treatment.
The invention uses tetrafluoroethylene-perfluoropropyl vinyl ether copolymer to modify polypropylene, and the outer surface layer of the cold seal base film has hydrophobic property due to the hydrophobic property of the fluorine material, and can be directly used as the cold seal base film without coating a release layer. Compared with the common biaxially oriented polypropylene film used for cold sealing of the base material, the outer surface of the film needs to be coated with a silicon-based release material, so that the coating procedures are reduced, and the production efficiency is greatly improved; and reduces the production cost.
The film prepared by the invention can be used in the field of cold sealing films, and the inner surface layer of the film is subjected to corona treatment, so that the surface tension is high, the coating adhesive force of cold sealing adhesive is strong, and the film is not easy to degum; the outer surface layer does not need to be coated with a silicon-based release layer, so that the surface tension is low, the antistatic effect is good, the release effect is good, and no residual glue is generated; in addition, the film prepared by the invention has excellent physical and mechanical properties and optical properties, small static electricity and simple processing technology.
Detailed description of the invention
In the following examples, the ethylene-propylene-butadiene ternary copolymer master batch contains 1 to 8 wt% of an ethylene chain segment, 5 to 10 wt% of a butadiene chain segment, and the balance of a propylene chain segment.
Example 1:
a preparation method of a coating-free biaxially oriented polypropylene cold seal base film comprises the following steps:
a. 5% of antistatic master batch (a mixture of glyceryl stearate, fatty acid polyglycol ester and homopolymerized polypropylene) and 95% of homopolymerized polypropylene are proportioned, conveyed to a double-screw extruder, heated and melted at 250 ℃, passed through a vacuum filtration system, water vapor and small molecular impurities in the raw materials are removed, and a core layer melt is formed through a 400-mesh candle filter;
adding 5% of antistatic master batch (a mixture of glyceryl stearate, fatty acid polyglycol ester and homopolymerized polypropylene), 15% of modified polypropylene (tetrafluoroethylene-perfluoropropyl vinyl ether copolymer 10%, polypropylene 90) and 80% of homopolymerized polypropylene into a double-screw extruder according to a ratio, melting, vacuumizing to remove moisture and impurities, and passing through a 250-mesh flat filter to form an outer surface layer melt;
mixing 5% of antistatic master batch (a mixture of glyceryl stearate, fatty acid polyglycol ester and homopolymerized polypropylene), 3% of adhesion master batch (3% of amorphous silica with the particle size of 5 mu m, 5% of spherical glass microsphere with the particle size of 3.5 mu m, 92% of homopolymerized polypropylene), 3% of linear low-density polyethylene, 5% of ethylene-propylene-butadiene ternary copolymer master batch and 84% of homopolymerized polypropylene, adding the mixture into another double-screw extruder, melting and vacuumizing to remove moisture and impurities, and forming an inner surface layer melt;
sequentially adding the outer surface layer melt, the core layer melt and the inner surface layer melt into a three-layer structure die head for converging, setting the temperature of the die head to be 240 ℃, and extruding to obtain a membrane;
b. attaching the diaphragm to a chilling roller by using a high-pressure patch air knife to be quenched to form a cast sheet, and entering a water bath, wherein the temperature of the chilling roller is 32 ℃, and the temperature of the water bath is 28 ℃;
c. longitudinally stretching the cast sheet into a thick sheet, wherein the longitudinal stretching preheating temperature is 130 ℃, the stretching temperature is 98 ℃, the setting zone temperature is 110 ℃, and the stretching ratio is 4.8 times. The longitudinal drawing preheating, drawing and shaping rollers all need to use Teflon material coatings;
d. transversely stretching the thick sheet to obtain a coating-free biaxially oriented polypropylene film cold sealing base film with the thickness of 18 mu m, wherein the preheating temperature is 178 ℃, the stretching temperature is 153 ℃, the setting temperature is 168 ℃, and the stretching ratio is 9.5 times;
e. cooling the film obtained in the step d) by natural wind, flattening the film in a traction system, cutting edges, measuring thickness, carrying out corona treatment, and then rolling the film; and after the detection is qualified, slitting and coiling are carried out to prepare a finished product.
f. The performance indexes of the finished product are as follows:
example 2:
a. 6% of antistatic master batch and 94% of homopolymerized polypropylene (a mixture of N, N-dihydroxyethyl octadecylamine, fatty alcohol polyether amide and homopolymerized polypropylene), proportioning, conveying to a double-screw extruder, heating and melting at 248 ℃, removing water vapor and micromolecular impurities in the raw materials through a vacuum filtration system, and forming a core layer melt through a 400-mesh candle filter;
adding 6% of antistatic master batch (a mixture of N, N-dihydroxyethyl octadecylamine, fatty alcohol polyether amide and homopolymerized polypropylene), 20% of modified polypropylene (20% of tetrafluoroethylene-perfluoropropyl vinyl ether copolymer, 80% of polypropylene) and 75% of homopolymerized polypropylene into a double-screw extruder according to a ratio, melting, vacuumizing to remove moisture and impurities, and then passing through a 250-mesh flat filter to form an outer surface layer melt;
4 percent of antistatic master batch (mixture of N, N-dihydroxyethyl octadecylamine, fatty alcohol polyether amide and homopolymerized polypropylene), 2.5 percent of adhesion master batch (10 percent of amorphous silicon dioxide with the grain diameter of 4.5 mu m, 3 percent of spherical glass microballoon with the grain diameter of 3 mu m, homopolymerized polypropylene 97), 4 percent of linear low-density polyethylene, 8 percent of ethylene-propylene-butadiene ternary copolymer master batch and 81.5 percent of homopolymerized polypropylene are proportioned and added into another double-screw extruder to be melted and vacuumized to remove moisture and impurities, and then an inner surface layer melt is formed;
sequentially adding the outer surface layer melt, the core layer melt and the inner surface layer melt into a three-layer structure die head for converging, setting the temperature of the die head to be 242 ℃, and extruding to obtain a membrane;
b. attaching the diaphragm to a chilling roller by using a high-pressure patch air knife to be quenched to form a cast sheet, and putting the cast sheet into a water bath, wherein the temperature of the chilling roller is 30 ℃, and the temperature of the water bath is 26 ℃;
c. longitudinally stretching the cast sheet into a thick sheet, wherein the longitudinal stretching preheating temperature is 125 ℃, the stretching temperature is 96 ℃, the setting zone temperature is 105 ℃, and the stretching ratio is 4.6 times. The longitudinal drawing preheating, drawing and shaping rollers all need to use Teflon material coatings;
d. transversely stretching the thick sheet to obtain a coating-free biaxially oriented polypropylene film cold sealing base film with the thickness of 18 mu m, wherein the preheating temperature is 179 ℃, the stretching temperature is 155 ℃, the setting temperature is 168 ℃, and the stretching ratio is 9.0 times;
e. cooling the film obtained in the step d) by natural wind, flattening the film in a traction system, cutting edges, measuring thickness, carrying out corona treatment, and then rolling the film; and after the detection is qualified, slitting and coiling are carried out to prepare a finished product.
f. The performance indexes of the finished product are as follows:
example 3
The preparation method is the same as example 1, and the compositions of the layers are as follows:
the core layer consists of the following components in percentage by mass: 1% of antistatic master batch (mixture of fatty acid polyglycol ester, fatty alcohol polyether amide and homopolymerized polypropylene) and 99% of homopolymerized polypropylene.
The outer surface layer consists of the following components in percentage by mass: 1% of antistatic master batch (mixture of fatty acid polyglycol ester, fatty alcohol polyether amide and homopolymerized polypropylene), 10% of modified polypropylene and 89% of homopolymerized polypropylene; the modified polypropylene is prepared by mixing the following components in percentage by mass: 1% of tetrafluoroethylene-perfluoropropyl vinyl ether copolymer and 99% of polypropylene;
the inner surface layer consists of the following components in percentage by mass: 1% of antistatic master batch (mixture of fatty acid polyglycol ester, fatty alcohol polyether amide and homopolymerized polypropylene), 1% of anti-blocking master batch, 10% of linear low-density polyethylene, 10% of ethylene-propylene-butadiene ternary copolymer master batch and 78% of homopolymerized polypropylene.
The anti-blocking master batch is prepared by mixing the following components in percentage by mass: 10 percent of amorphous silicon dioxide with the grain diameter of 5.5 mu m, 10 percent of spherical glass beads with the grain diameter of 34 mu m and 80 percent of homopolymerized polypropylene.
Example 4
The preparation method is the same as example 1, and the compositions of the layers are as follows:
the core layer consists of the following components in percentage by mass: 10% of antistatic master batch (mixture of glyceryl stearate, fatty alcohol polyether amide and homopolymerized polypropylene) and 90% of homopolymerized polypropylene.
The outer surface layer consists of the following components in percentage by mass: 10% of antistatic master batch (a mixture of glyceryl stearate, fatty alcohol polyether amide and homopolymerized polypropylene), 80% of modified polypropylene and 70% of homopolymerized polypropylene; the modified polypropylene is prepared by mixing the following components in percentage by mass: 30% of tetrafluoroethylene-perfluoropropyl vinyl ether copolymer and 70% of polypropylene;
the inner surface layer consists of the following components in percentage by mass: 1% of antistatic master batch (mixture of glyceryl stearate, fatty alcohol polyether amide and homopolymerized polypropylene), 3% of anti-blocking master batch, 3% of linear low-density polyethylene, 1% of ethylene-propylene-butadiene ternary copolymer master batch and 92% of homopolymerized polypropylene.
The anti-blocking master batch is prepared by mixing the following components in percentage by mass: 3% of amorphous silicon dioxide with the grain diameter of 4.5 mu m, 3-10% of spherical glass beads with the grain diameter of 3 mu m and the balance of homopolymerized polypropylene.
Claims (6)
1. The utility model provides a exempt from to coat biaxial stretching polypropylene cold seal base film, this cold seal base film comprises extexine, sandwich layer and interior skin layer, its characterized in that:
the outer surface layer consists of the following components in percentage by mass: 1-10% of antistatic master batch, 10-80% of modified polypropylene and the balance of homopolymerized polypropylene;
the modified polypropylene is prepared by mixing the following components in percentage by mass: 1-30% of tetrafluoroethylene-perfluoropropyl vinyl ether copolymer and the balance of polypropylene;
the inner surface layer consists of the following components in percentage by mass: 1-5% of antistatic master batch, 1-3% of anti-blocking master batch, 3-10% of linear low-density polyethylene, 1-10% of ethylene-propylene-butadiene ternary copolymer master batch and the balance of homopolymerized polypropylene;
the anti-blocking master batch is prepared by mixing the following components in percentage by mass: 3-10% of amorphous silicon dioxide, 3-10% of spherical glass beads and the balance of homo-polypropylene;
in the ethylene-propylene-butadiene ternary copolymer master batch, the ethylene chain segment accounts for 1-8 wt%, the butadiene chain segment accounts for 5-10 wt%, and the balance is the propylene chain segment.
2. The coating-free biaxially oriented polypropylene cold seal base film according to claim 1, wherein: the thickness of the outer surface layer is 0.8-2.5 mu m, and the thickness of the inner surface layer is 1.2-3.0 mu m.
3. The coating-free biaxially oriented polypropylene cold seal base film according to claim 1, wherein: the particle size of the amorphous silicon dioxide is 4.5-5.5 mu m, and the particle size of the spherical glass beads is 3-4 mu m.
4. The coating-free biaxially oriented polypropylene cold seal base film according to claim 1, wherein: the core layer comprises the following components in percentage by mass: 1-10% of antistatic master batch and the balance of homopolymerized polypropylene.
5. The coating-free biaxially oriented polypropylene cold seal base film according to claim 1 or 4, wherein: the antistatic master batch is a mixture of at least two of glycerin monostearate, fatty acid polyglycol ester, N-dihydroxyethyl octadecylamine and fatty alcohol polyether amide and homopolymerized polypropylene.
6. The method for preparing the coating-free biaxially oriented polypropylene cold seal base film according to claim 1, wherein the method comprises the following steps: the method comprises the following steps:
(1) conveying the core layer material to a double-screw extruder according to a ratio, heating and melting at 240-260 ℃, removing water vapor and small molecular impurities in the raw material through a vacuum filtration system, and forming a core layer melt through a 400-mesh candle core type filter;
respectively adding the components of the outer surface layer and the inner surface layer into two double-screw extruders, melting, vacuumizing to remove moisture and impurities, and passing through a 250-mesh flat filter to form an outer surface layer melt and an inner surface layer melt;
(2) sequentially adding the outer surface layer melt, the core layer melt and the inner surface layer melt into a three-layer structure die head, converging and extruding to obtain a membrane, and attaching the membrane to a chill roll at the temperature of 20-40 ℃ by using a patch air knife to quench and form a cast sheet;
(3) longitudinally stretching the cast sheet into a thick sheet, wherein the preheating temperature is 120-140 ℃, the stretching temperature is 130-135 ℃, and the stretching ratio is 4.5-4.8 times;
(4) feeding the longitudinally stretched sheet into a transverse drawing box, wherein the preheating temperature is 170-180 ℃, the drawing temperature is 150-155 ℃, the setting area is 160-170 ℃, the drawing ratio is 9-9.5 times, and the retraction ratio is 1.6-2.5%;
(5) the film enters a traction system for flattening through air cooling, and the inner surface of the film is subjected to corona treatment and is wound; then the finished product is prepared by cutting and packaging after aging treatment.
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| CN111231462A (en) * | 2019-03-22 | 2020-06-05 | 上海灵博塑料包装有限公司 | Easy-to-open transparent polyethylene blown film with thickness of less than 45 micrometers and preparation method thereof |
| CN110498910A (en) * | 2019-08-26 | 2019-11-26 | 青岛嘉泽包装有限公司 | A kind of low temperature packing film and preparation method thereof |
| CN114290782A (en) * | 2022-01-13 | 2022-04-08 | 广东德冠包装材料有限公司 | Biaxially oriented polypropylene film for epoxy resin curing and preparation method thereof |
| CN116922912A (en) * | 2023-07-07 | 2023-10-24 | 安徽国风新材料股份有限公司 | Antistatic coating transfer extinction film and preparation method thereof |
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| CN101723132A (en) * | 2009-10-22 | 2010-06-09 | 惠州宝柏包装有限公司 | Release BOPP thin film and preparation method thereof |
| CN101885256A (en) * | 2010-06-22 | 2010-11-17 | 佛山市塑兴母料有限公司 | Release liner and production method thereof |
| CN105522798A (en) * | 2016-01-06 | 2016-04-27 | 湖南尚鑫新材料科技有限公司 | High-temperature-resistant compound release film and producing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101723132A (en) * | 2009-10-22 | 2010-06-09 | 惠州宝柏包装有限公司 | Release BOPP thin film and preparation method thereof |
| CN101885256A (en) * | 2010-06-22 | 2010-11-17 | 佛山市塑兴母料有限公司 | Release liner and production method thereof |
| CN105522798A (en) * | 2016-01-06 | 2016-04-27 | 湖南尚鑫新材料科技有限公司 | High-temperature-resistant compound release film and producing method thereof |
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