CN111516334B - Straight-line easy-to-tear aluminized nylon film and preparation method thereof - Google Patents
Straight-line easy-to-tear aluminized nylon film and preparation method thereof Download PDFInfo
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- CN111516334B CN111516334B CN202010364784.1A CN202010364784A CN111516334B CN 111516334 B CN111516334 B CN 111516334B CN 202010364784 A CN202010364784 A CN 202010364784A CN 111516334 B CN111516334 B CN 111516334B
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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
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
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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
- B32B27/16—Layered products comprising a layer of synthetic resin specially treated, e.g. irradiated
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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
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
-
- 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
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
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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
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
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- 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
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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
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/582—Tearability
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
- B32B2307/7244—Oxygen barrier
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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
- B32B2553/00—Packaging equipment or accessories not otherwise provided for
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- 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
- C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- C08J2377/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
-
- 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
- C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
-
- 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
- C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- C08J2477/06—Polyamides derived from polyamines and polycarboxylic acids
Abstract
The invention provides a straight-line easy-tearing aluminized nylon film and a preparation method thereof, wherein the straight-line easy-tearing aluminized nylon film comprises a film layer structure and an aluminum evaporation layer; the base film is a three-layer co-extrusion biaxially oriented nylon film which is A, B, C layers from top to bottom in sequence; the layer A and the layer C are both composed of 67-79.5% of nylon 6, 20-30% of special nylon composition and 0.5-3% of anti-sticking nylon master batch; the layer B consists of 60 to 70 percent of nylon 6 and 30 to 40 percent of special nylon composition; the special nylon composition contains MXD6-PA66 copolymer, long carbon chain nylon, nylon copolymer and compatilizer. The film has the advantages of excellent oxygen barrier property, easy linear tearing and the like, has linear tearing property even if being combined with films such as PP, PE and the like, can keep fragrance and prolong the quality guarantee period of foods and the like, and is particularly suitable for packaging products such as leisure foods, medicines and the like.
Description
Technical Field
The invention relates to the technical field of thin film materials, in particular to a linear easy-tear aluminized nylon thin film and a preparation method thereof.
Background
With the development of socio-economy, people are pursuing more and more convenience of life, especially in the field of packaging. The existing product for packaging food, medicine and the like usually adopts PE, PP and other materials as a heat sealing layer, and the outer layer adopts PA, PET and other materials, so that the bag with the structure has the characteristics of high sealing strength and excellent barrier property, but has the problems of large tearing resistance and incapability of being torn straightly along scratches during use, thereby causing certain troubles in life. Particularly for the elderly and children, it is more desirable that the product is easily torn due to physical strength. Accordingly, there is an increasing demand for films having oxygen barrier properties and linear tearability, and research thereon is being conducted.
Patent CN105778488A, published Japanese 2016.07.20, discloses a linear easy-to-tear polyamide film, which comprises 39-81 parts of PA6, 8-30 parts of MXD6, 5-10 parts of softening agent, 3-20 parts of PA6/MXD6 secondary material and 1-3 parts of MXD 6-g-MAH.
Patent CN109890609A, published japanese patent No. 2019.06.14, discloses an easily tearable aluminum vapor-deposited biaxially stretched film comprising at least an aluminum vapor-deposited layer (a)/a barrier layer (B)/an adhesive layer (C)/a polypropylene layer (D) laminated in this order, wherein the barrier layer (B) comprises a mixture of a polyamide (a) and an amorphous polyamide (B), the polyamide (a) is a polyamide comprising a diamine unit and a dicarboxylic acid unit, the diamine unit contains 70 mol% or more of a structural unit derived from xylylenediamine, the dicarboxylic acid unit contains 70 mol% or more of a structural unit derived from an α, ω -linear aliphatic dicarboxylic acid having 4 to 20 carbon atoms, and the barrier layer (B) contains 30 to 70 mass% of the polyamide (a) and 30 to 70 mass% of the amorphous polyamide (B).
Although the related products of the straight-line easy-tearing film are disclosed, the types of the products are still relatively few, and the market demands are difficult to meet. Therefore, the development of novel linear easy-to-tear film products is still the appeal of the industry.
Disclosure of Invention
In order to solve the problems that related products of the existing straight-line easy-to-tear film are still few in types and are difficult to meet the market demand in the background art, the invention provides the straight-line easy-to-tear aluminized nylon film, and the film layer structure of the straight-line easy-to-tear aluminized nylon film comprises a base film and an aluminum evaporation layer;
the base film is a three-layer co-extrusion biaxially oriented nylon film, and A, B, C layers are sequentially arranged from top to bottom; the layer A and the layer C are respectively composed of 67-79.5% of nylon 6, 20-30% of special nylon composition and 0.5-3% of anti-sticking nylon master batch by mass percentage; the layer B consists of 60 to 70 percent of nylon 6 and 30 to 40 percent of special nylon composition;
the special nylon composition contains MXD6-PA66 copolymer, long carbon chain nylon, nylon copolymer and compatilizer.
In the prior art, special nylon MXD6 is added into a film material to change the internal molecular morphology of nylon so that the nylon film has linear tearability. However, in actual production, the addition of special nylon MXD6 into a nylon film material is found to cause the problems of high rigidity of MXD6, easy film rupture, reduced puncture resistance and flexibility of the film, easy occurrence of pinholes in subsequent processing, obvious bow effect and low yield of the linear easy-to-tear nylon film although the linear easy-to-tear nylon film material has linear easy-to-tear property. The special nylon MXD6 is replaced by the special nylon composition containing the MXD6-PA66 copolymer, the long carbon chain nylon, the nylon copolymer and the compatilizer, so that the yield can be improved.
Furthermore, the proportion of the PA66 component in the MXD6-PA66 copolymer is 1-10%.
Further, the long carbon chain nylon is an odd-even long carbon chain nylon formed by polycondensation of alpha, omega-straight chain aliphatic dicarboxylic acid with the carbon number of 5-20 and alpha, omega-straight chain aliphatic diamine with the carbon number of 5-20, or an even long carbon chain nylon formed by polycondensation of alpha, omega-straight chain aliphatic dicarboxylic acid with the carbon number of 5-20 and alpha, omega-straight chain aliphatic diamine with the carbon number of 5-20; the melting point of the long carbon chain nylon is 175-240 ℃.
Further, the nylon copolymer is at least one of a PA66/PA6 copolymer, an MXD6/PA6 copolymer and an MXD6/PA1010 copolymer.
Further, the compatilizer is at least one of MXD6-g-MAH and MXD 6-g-GMA.
Further, the content ratio of the MXD6-PA66 copolymer to the long carbon chain nylon to the nylon copolymer to the compatilizer is 6-8: 3-4: 2-3: 1 to 2.
Further, at least one side of the A and C layers is corona treated, and the corona value is more than 50 dyn.
Further, the thickness of the base film is 10-25 μm, and the thickness of the layer A and the thickness of the layer C are both 1-4 μm;
at least one surface of the A layer and the C layer is subjected to corona treatment, and the corona value is more than 50 dyn;
the thickness of the aluminum evaporation layer is 30-400 nm.
The invention also provides a preparation method of the straight-line easy-tearing aluminized nylon film, which comprises the following steps:
step one, preparing a base film:
respectively mixing the components in the A, B, C layers in proportion, and uniformly dispersing the components by a high-speed stirrer;
melting and co-extruding the uniformly mixed raw materials through three extruders, and casting the melt to a chilled roll with the surface temperature of 15-35 ℃ through a T-shaped die to quench the cast sheet;
thirdly, humidifying the casting sheet in the second step for about 1-2 minutes in a water tank at the temperature of 40-75 ℃, drying the residual moisture on the surface of the humidified casting sheet by using an air knife, and synchronously or distributively stretching the casting sheet at the stretching temperature of 130-205 ℃ at the stretching magnification of 2.5 multiplied by 2.5-3.5 multiplied by 3.5;
fourthly, performing heat setting treatment on the film obtained in the third step at the setting temperature of 180-215 ℃, performing corona treatment on at least one of the layer A and the layer C, and then rolling and cutting to obtain the base film, wherein the thickness of the base film is 10-25 mu m, and the thicknesses of the layer A and the layer C are both 1-4 mu m;
and step two, unreeling the base film in the step one in a vacuum aluminizing machine, carrying out plasma treatment on a corona surface, and simultaneously heating a high-purity aluminum wire in vacuum aluminizing equipment to form gaseous aluminum so that aluminum atoms are attached to the surface of the film to form an aluminized layer.
Further, the purity of the aluminum wire is 99.99 percent, the aluminum wire is evaporated by high-frequency induction heating, the temperature is 1500 ℃, and the vacuum degree is 4 multiplied by 10-4mbar, uniformity of the aluminum coating is controlled within 5%.
The straight-line easy-tearing aluminized nylon film provided by the invention has the advantages of excellent oxygen barrier property, straight-line easy tearing and the like, has good straight-line tearing property even if the bag is compounded with films such as PP, PE and the like, can keep fragrance and prolong the quality guarantee period of foods and the like, and is particularly suitable for packaging products such as leisure foods, medicines and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of a linear easy-to-tear aluminized nylon film according to the present invention;
FIG. 2 is a schematic diagram of the evaluation of the linear tear properties of the film.
Reference numerals:
10 base film 20 aluminum evaporation layer
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The preparation method of the straight-line easy-tearing aluminized nylon film provided by the embodiment of the invention comprises the following steps:
step one, preparing a base film:
respectively mixing the components in the A, B, C layers in proportion, and uniformly dispersing the components by a high-speed stirrer;
melting and co-extruding the uniformly mixed raw materials through three extruders, and casting the melt to a chilled roll with the surface temperature of 15-35 ℃ through a T-shaped die to quench the cast sheet;
thirdly, humidifying the casting sheet in the second step for about 1-2 minutes in a water tank at the temperature of 40-75 ℃, drying the residual moisture on the surface of the humidified casting sheet by using an air knife, and synchronously or distributively stretching the casting sheet at the stretching temperature of 130-205 ℃ at the stretching magnification of 2.5 multiplied by 2.5-3.5 multiplied by 3.5;
fourthly, performing heat setting treatment on the film obtained in the third step at the setting temperature of 180-215 ℃, performing corona treatment on at least one of the layer A and the layer C, and then rolling and cutting to obtain the base film;
step two, unreeling the base film in the step one in a vacuum aluminizing machine, carrying out plasma treatment on a corona surface, and simultaneously heating a high-purity aluminum wire in a vacuum aluminizing device to evaporate the high-purity aluminum wire into gaseous aluminum so that aluminum atoms are attached to the surface of the film to form an aluminized layer; the aluminum wire has a purity of 99.99%, and is evaporated by high-frequency induction heating at 1500 deg.C and a vacuum degree of 4 × 10-4mbar, uniformity of the aluminum coating is controlled within 5%.
Example 1
As shown in figure 1, the linear easy-to-tear aluminized nylon film has a base film thickness of 15 μm, a layer A and a layer C thickness of 2 μm, and an aluminum evaporation layer thickness of 40 nm.
The layer A and the layer C are respectively composed of 69.5 percent of nylon 6, 30 percent of special nylon composition and 0.5 percent of anti-sticking nylon master batch by mass percentage; the layer B consists of 70 percent of nylon 6 and 30 percent of special nylon composition;
the special nylon composition consists of MXD6-PA66 copolymer, PA512, PA66/PA6 copolymer and MXD6-g-MAH, and the content ratio is 6: 4: 3: 1.
example 2
As shown in figure 1, the linear easy-to-tear aluminized nylon film has a base film thickness of 15 μm, a layer A and a layer C thickness of 3 μm, and an aluminum evaporation layer thickness of 100 nm.
The layer A and the layer C consist of 79 percent of nylon 6, 20 percent of special nylon composition and 1 percent of anti-sticking nylon master batch in percentage by mass; the layer B consists of 65 percent of nylon 6 and 35 percent of special nylon composition;
the special nylon composition consists of MXD6-PA66 copolymer, PA612, MXD6/PA6 copolymer and MXD6-g-MAH, and the content ratio is 7: 3: 3: 1.
example 3
As shown in figure 1, the linear easy-to-tear aluminized nylon film has a base film thickness of 15 μm, a layer thickness of A and a layer thickness of C of 4 μm, and an aluminum evaporation layer thickness of 400 nm.
The layer A and the layer C consist of 77 percent of nylon 6, 20 percent of special nylon composition and 3 percent of anti-sticking nylon master batch in percentage by mass; the layer B consists of 60 percent of nylon 6 and 40 percent of special nylon composition;
the special nylon composition consists of MXD6-PA66 copolymer, PA1616, MXD6/PA1010 copolymer and MXD6-g-GMA, and the content ratio is 8: 3: 2: 2.
comparative example 1
The aluminized nylon film is characterized in that the film structure is formed by sequentially laminating a base film and an aluminum evaporation layer. Wherein the thickness of the base film is 15 μm by adopting a common BOPA film, and the thickness of the aluminum evaporation layer is 40 nm.
The preparation method comprises the following steps: unreeling the BOPA film in a vacuum aluminizing machine, carrying out plasma treatment on a corona surface, and simultaneously heating a high-purity aluminum wire in a vacuum aluminizing device to evaporate the high-purity aluminum wire into gaseous aluminum so that aluminum atoms are attached to the surface of the film to form an aluminized layer; the aluminum wire has a purity of 99.99%, and is evaporated by high-frequency induction heating at 1500 deg.C and a vacuum degree of 4 × 10-4mbar, uniformity of the aluminum coating is controlled within 5%.
Comparative example 2
The aluminized nylon film is characterized in that the film structure is formed by sequentially laminating a base film and an aluminum evaporation layer. The thickness of the base film is 15 μm, the thickness of the A and C layers is 2.5 μm, and the thickness of the aluminum evaporation layer is 30 nm.
The layer A and the layer C consist of 72 percent of nylon 6, 25 percent of MXD6 and 3 percent of anti-sticking nylon master batch in percentage by mass; layer B consisted of 70% nylon 6 and 30% MXD6 composition.
The preparation method is the same as that of the example.
Comparative example 3
The aluminized nylon film is characterized in that the film structure is formed by sequentially laminating a base film and an aluminum evaporation layer. The thickness of the base film is 15 μm, the thickness of the A and C layers is 2.5 μm, and the thickness of the aluminum evaporation layer is 30 nm.
The layer A and the layer C consist of 72 percent of nylon 6, 25 percent of MXD6 and 3 percent of anti-sticking nylon master batch in percentage by mass; the B layer was composed of 70% nylon 6 and 30% MXD6-PA66 copolymer.
The preparation method is the same as that of the example.
The present invention tests the relevant performance of the above examples and comparative examples, and the specific result data is shown in table 1.
Evaluation of straight-line tear Performance: cutting a film with length (MD direction) and width (TD direction) of 220mm × 40mm, cutting a tear notch with length of 20mm in the middle of the film, tearing the film at uniform speed along the direction of the crack for 200mm, and measuring the maximum distance of the tear notch from the center line of the tear opening during tearing, namely the deviation displacement SβAs shown in fig. 2. The measurement was carried out on 25 films, if the tear displacement S0An average deviation displacement S at 200mmβWhen the thickness is less than or equal to 6mm, the straight tearing property of the film is good (marked as a), and on the contrary, the straight tearing property of the film is poor (marked as gamma).
Yield evaluation: if the yield of the nylon film for preparing the nylon composite film (PA/PE) with linear tearing performance is less than 90%, the yield is low (recorded as □); if the yield of the nylon film for preparing the nylon composite film (PA/PE) with linear tearing performance is more than 90%, the yield is high (marked as delta).
TABLE 1
| Item | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Linear tearability | ▲ | ▲ | ▲ | ╳ | ▲ | ▲ |
| Yield of | Δ | Δ | Δ | - | □ | □ |
Note: comparative example 1 had no linear tear and the yield rating was reported-.
As can be seen from Table 1, the films prepared in examples 1-3 of the present invention all had MD direction linear tearability and the yield evaluation was high; the films of comparative examples 2 and 3 also had MD direction linear tear properties, but the yield evaluation was low. Therefore, the special nylon composition containing the MXD6-PA66 copolymer, the long carbon chain nylon, the nylon copolymer and the compatilizer can improve the yield.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. The utility model provides a straight line easily tears aluminized nylon film which characterized in that: the film layer structure comprises a base film and an aluminum evaporation layer;
the base film is a three-layer co-extrusion biaxially oriented nylon film, and A, B, C layers are sequentially arranged from top to bottom; the layer A and the layer C are respectively composed of 67-79.5% of nylon 6, 20-30% of special nylon composition and 0.5-3% of anti-sticking nylon master batch by mass percentage; the layer B consists of 60 to 70 percent of nylon 6 and 30 to 40 percent of special nylon composition;
the special nylon composition contains MXD6-PA66 copolymer, long carbon chain nylon, nylon copolymer and compatilizer;
the long carbon chain nylon is odd-even long carbon chain nylon formed by the polycondensation of alpha, omega-straight chain aliphatic dicarboxylic acid with the carbon atom number of 5-20 and alpha, omega-straight chain aliphatic diamine with the carbon atom number of 5-20, or even long carbon chain nylon formed by the polycondensation of alpha, omega-straight chain aliphatic dicarboxylic acid with the carbon atom number of 5-20 and alpha, omega-straight chain aliphatic diamine with the carbon atom number of 5-20, wherein the melting point of the long carbon chain nylon is 175-240 ℃;
the nylon copolymer is at least one of a PA66/PA6 copolymer, an MXD6/PA6 copolymer and an MXD6/PA1010 copolymer;
the compatilizer is at least one of MXD6-g-MAH and MXD 6-g-GMA;
the content ratio of the MXD6-PA66 copolymer to the long carbon chain nylon to the nylon copolymer to the compatilizer is 6-8: 3-4: 2-3: 1 to 2.
2. The linear easy-tear aluminized nylon film according to claim 1, characterized in that: the PA66 component in the MXD6-PA66 copolymer accounts for 1-10%.
3. The linear easy-tear aluminized nylon film according to claim 1, characterized in that: at least one side of the A and C layers is subjected to corona treatment, and the corona value is more than 50 dyn.
4. The linear easy-tear aluminized nylon film according to claim 1, characterized in that: the thickness of the base film is 10-25 mu m, and the thickness of the A layer and the thickness of the C layer are both 1-4 mu m;
the thickness of the aluminum evaporation layer is 30-400 nm.
5. The preparation method of the linear easy-to-tear aluminized nylon film according to any one of claims 1 to 4, characterized by comprising the following steps: the method comprises the following steps:
step one, preparing a base film:
respectively mixing the components in the A, B, C layers in proportion, and uniformly dispersing the components by a high-speed stirrer;
melting and co-extruding the uniformly mixed raw materials through three extruders, and casting the melt to a chilled roll with the surface temperature of 15-35 ℃ through a T-shaped die to quench the cast sheet;
thirdly, humidifying the casting sheet in the second step for 1-2 minutes in a water tank at the temperature of 40-75 ℃, drying the residual moisture on the surface of the humidified casting sheet by using an air knife, and synchronously or step-by-step stretching at the stretching temperature of 130-205 ℃ at the stretching magnification of 2.5 multiplied by 2.5-3.5 multiplied by 3.5;
fourthly, performing heat setting treatment on the film obtained in the third step at the setting temperature of 180-215 ℃, performing corona treatment on at least one of the layer A and the layer C, and then rolling and cutting to obtain the base film, wherein the thickness of the base film is 10-25 mu m, and the thicknesses of the layer A and the layer C are both 1-4 mu m;
and step two, unreeling the base film obtained in the step one in a vacuum aluminizing machine, carrying out plasma treatment on a corona surface, and simultaneously heating a high-purity aluminum wire to form gaseous aluminum so that aluminum atoms are attached to the surface of the film to form an aluminized layer.
6. The method for preparing the straight-line easy-tearing aluminized nylon film according to claim 5, characterized in that: the aluminum wire has a purity of 99.99%, is evaporated by high-frequency induction heating at 1500 deg.C and a vacuum degree of 4 × 10-4mbar, uniformity of the aluminum coating is controlled within 5%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010364784.1A CN111516334B (en) | 2020-04-30 | 2020-04-30 | Straight-line easy-to-tear aluminized nylon film and preparation method thereof |
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| CN202010364784.1A CN111516334B (en) | 2020-04-30 | 2020-04-30 | Straight-line easy-to-tear aluminized nylon film and preparation method thereof |
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