CN112644129B - Single-material patterned thin film and preparation method and application thereof - Google Patents

Single-material patterned thin film and preparation method and application thereof Download PDF

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Publication number
CN112644129B
CN112644129B CN201910964960.2A CN201910964960A CN112644129B CN 112644129 B CN112644129 B CN 112644129B CN 201910964960 A CN201910964960 A CN 201910964960A CN 112644129 B CN112644129 B CN 112644129B
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film
films
composite film
glue
material patterned
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CN112644129A (en
Inventor
郑萃
唐毓婧
姚雪容
任敏巧
施红伟
张韬毅
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Sinopec Beijing Research Institute of Chemical Industry
China Petroleum and Chemical Corp
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Sinopec Beijing Research Institute of Chemical Industry
China Petroleum and Chemical Corp
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
    • 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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
    • 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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
    • 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
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F15/00—Boards, hoardings, pillars, or like structures for notices, placards, posters, or the like
    • G09F15/0006—Boards, hoardings, pillars, or like structures for notices, placards, posters, or the like planar structures comprising one or more panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F15/00—Boards, hoardings, pillars, or like structures for notices, placards, posters, or the like
    • G09F15/02—Bills, posters, or the like therefor
    • 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
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging

Abstract

The invention discloses a single-material patterned composite film, a preparation method thereof and application thereof, wherein the composite film comprises two groups of films, one surface of each group of films is a smooth surface, the other surface of each group of films is a rough surface, a patterned first adhesive layer is arranged between the rough surfaces of the two groups of films, each group of films is independently of a single-layer or multi-layer structure, the content of high molecular materials in each layer of film is more than 80wt%, and the high molecular materials of the films are the same high molecular material. The single-material patterned film can be applied to packaging bags and advertising boards, and because each layer is made of a single same high polymer material, the patterned composite film can be recycled, so that the environmental pressure and the energy waste can be reduced.

Description

Single-material patterned thin film and preparation method and application thereof
Technical Field
The invention relates to the field of thin films, in particular to a single-material patterned thin film and a preparation method and application thereof.
Background
The environment of the earth is increasingly deteriorated, and environmental pollution caused by difficult degradation of plastics is one of the important causes for the deterioration of the environment. In particular, in recent years, pollution of the sea and damage to marine organisms caused by plastic floating objects have not been paid much attention. Among the many solutions, the concept of plastic recycling economy proposed by the dawski forum in 2016 has gained much acceptance, indicating that plastics should be mostly recyclable products. Most of the commercial polymer films are currently used in the form of multi-material composite films. The composite film comprises a PA layer, a first PE layer, an EVOH layer, a second PE layer and an EVA layer from outside to inside in sequence, wherein the PA layer has a thickness of 15-30 um, the first PE layer has a thickness of 10-30 um, the EVOH layer has a thickness of 5-20 um, the second PE layer has a thickness of 10-50 um, and the EVA layer has a thickness of 180-300 um. These layers have different functions, some providing strength, some providing barrier, some providing heat sealing properties, etc. The performance of a single film without being compounded is difficult to meet the needs of people, but the compound film of multiple materials is difficult to recycle, and great pressure is caused to the environment. Designing a composite film of a single material and realizing a specific function by using a multilayer structure of the single material is a method for solving the problem.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a single-material patterned composite film and a preparation method thereof.
The invention aims to provide a single-material patterned composite film, which comprises two groups of films, wherein one surface of each group of films is a smooth surface, the other surface of each group of films is a rough surface, a patterned first adhesive layer is arranged between the rough surfaces of the two groups of films, each group of films is independently of a single-layer or multi-layer structure, the content of macromolecular materials in each layer of film is more than 80wt%, and the macromolecular materials of the films are the same macromolecular material.
Wherein, the content of the polymer material in each layer of film is preferably more than 90 wt%.
When each group of films is of a multilayer structure, the structure is a multilayer co-extruded film, or the structure is a structure of an interlayer adhesive layer between the multilayer films in the group, or the combination of the two structures.
In the present invention, the rough surface means a surface having a surface roughness of more than 50nm, preferably more than 100nm. The smooth surface refers to a surface with a surface roughness of less than 40nm, preferably less than 30nm.
The surface roughness refers to surface profile information of at least 5 square micrometers by using an instrument capable of detecting a surface profile such as an optical profiler or an atomic force microscope, and then calculating an average roughness Ra based on the surface profile information.
The surface contour information refers to a set of information of the relative height of each location of a given surface.
The average roughness Ra refers to given surface profile information, taking the arithmetic mean height of the heights of all the positions of the surface as a median plane, and taking the average of the distances from all the heights of the surface to the median plane.
Wherein the polymer material of each layer of film is optionally selected from film-formable polymer materials. The single material or the same high polymer material refers to the same high polymer material or the same kind of high polymer material with different physical and chemical parameters; also included are polymeric materials of the same type but obtained by different polymerization modes.
The physical and chemical parameters are preferably one or more of different molecular weights, different molecular weight distributions, different comonomer contents and different comonomer distributions.
The comonomer mentioned above refers to a portion of the monomer having a molar content of less than 20% of the total monomer content.
The polymer material is preferably polyolefin polymer or polyester polymer material. Among them, the polyolefin-based polymer is more preferably any one of polyethylene, polypropylene, polystyrene, and polyvinyl chloride, and the polyester-based polymer is more preferably any one of polycarbonate and polyethylene terephthalate.
The first adhesive layer comprises an adhesive B; the interlayer adhesive layer comprises an adhesive A.
The glue A and/or the glue B are selected from organic adhesives. The glue a and the glue B may be the same or different.
In the present invention, the glue a and the glue B may be any general-purpose glue capable of impregnating a polymer with a rough surface and a smooth surface and having a viscosity, and are preferably any one of organic adhesives, more preferably a polymer-based glue or a glue having a structural unit identical to that of the polymer material. Wherein the polymer glue is preferably any one of acrylate, vinyl acetate or two-polymer glue. Preferably, in the organic adhesive, 80wt% or more of the structural units of the component are the same as those of the polymer material. Further, the organic binder is preferably a polymer material of the same type having a molecular weight smaller than that of the polymer material.
Specifically, the glue a or the glue B may be 501 glue, 502 glue, polyethylene wax, POE glue, or the like.
In the present invention, the internal haze of the single layer film is less than 5%, preferably less than 3%. The internal haze of the film refers to that after a liquid which is uniform on both sides of the film, has a refractive index which is less than 0.02 different from that of a film matrix and a viscosity which is less than 10cp and can be fully infiltrated with the film is coated on the surface of the film (for example, silicone oil is coated on the surface of a polyethylene film), the haze of the film is tested according to a method described in the standard ASTM-D1003-07 or GB/T2410-2008, and the obtained result is the internal haze of the film.
In the present invention, the thickness of the film is not particularly limited, and preferably, the thickness of each layer of the film is more than 0.5 μm.
The invention also aims to provide a preparation method of the single-material patterned composite film, which comprises the following steps:
(1) Obtaining two groups of films of high polymer materials, one surface of each film is a smooth surface, and the other surface of each film is a rough surface;
(2) And (3) enabling the rough surfaces of the two groups of films to be opposite, drawing a pattern on at least one rough surface by using glue B or pasting the patterned glue B, and bonding the two groups of films together by using the glue B to obtain the single-material patterned composite film.
In the step (1), when the structure of the interlayer adhesive layer is formed between the plurality of layers of films in each group of films, the preparation method preferably comprises the following steps: obtaining a film with at least one rough surface marked as XA; obtaining at least one film with a smooth surface marked as XB; and optionally one or more films, coating glue A on the opposite surface of the XA rough surface, the optional two surfaces of the film and the opposite surface of the XB smooth surface, and bonding the layers in sequence through the glue A to obtain a group of films with one surface being the smooth surface and the other surface being the rough surface.
More preferably, when each set of films is independently a multilayer structure, it can be prepared by the following steps:
(a) Obtaining a film of a high polymer material with at least one rough surface marked as XA;
(b) Obtaining at least one single-layer film of the same polymer material with a smooth surface, marked as XB1, or two multi-layer films of the same polymer material with the outermost surfaces being smooth surfaces, marked as XB2, and optional films with unlimited surfaces;
(c) Smearing the contact surfaces of the other surface of XA opposite to the rough surface, the two sides of the optional film and the other surface of XB1 opposite to the smooth surface by using glue A, and sequentially adhering to obtain a group of films; or smearing the other surface of XA opposite to the rough surface, two surfaces of the optional film and one surface of XB2 by using the glue A between the contact surfaces of the layers, and sequentially adhering to obtain a group of films;
(d) Obtaining another set of films according to step (c).
The source of each of the films and the interlayer films is not particularly limited, and the films can be obtained commercially or by any conventional film-forming method known in the art. For example, the film is made of a polymer material by using the film preparation processes of blow molding, casting, biaxial stretching and the like in the prior art.
In the above steps, when the glue a is applied, the glue a may be applied to the interlayer contact surfaces of the multiple layers of films, or only a part of the contact surfaces may be applied, but the films are adhered together without separation, and the middle of the glue a does not contain a visible air layer. Preferably, glue a is applied to fill the interface between the layers to obtain a clearer desired pattern.
Preferably, both surfaces of the film are smooth by any one of a casting method and a biaxial stretching method. The resulting film may be a monolayer or multilayer film.
Preferably, a film having both surfaces roughened by blow molding or a film having both surfaces smoothed has one surface roughened to provide a film having at least one surface roughened.
In the present invention, roughening refers to a process of roughening a surface by physical force through single or multiple impacts or frictions of the surface with a large number of coarse small particles.
The roughening is carried out by methods commonly used in the prior art, such as sanding with sand paper.
The film preparation equipment such as blow molding, casting, biaxial stretching and the like is obtained by using conventional corresponding processing equipment, and the equipment parameters are conventional parameters which can enable the material to be processed into a continuous film in a conventional instrument and are not specially specified.
In the above steps, the bonding includes normal temperature bonding or high temperature bonding. The normal temperature bonding or the high temperature bonding adopts the conventional conditions in the prior art. Wherein the high temperature bonding conditions are at a temperature that melts glue A or glue B but does not cause melting of the layers of the film.
In the step (2), the glue B is used for drawing a pattern or the patterned glue B is used, and the pattern can be any pattern or a specific pattern, such as a solid circular pattern, a non-solid circular pattern, characters and the like. The patterned glue B can be obtained by a conventional method of patterning glue, such as printing, etc. The pattern is drawn with the paste B, and may be drawn with a tool such as a pen, sprayed with a spray gun, or the like by a usual method.
The invention also aims to provide the application of the single-material patterned composite film in packaging bags and advertising boards.
The film of the invention has a rough surface, can possibly scatter more than 70 percent of visible light, but basically does not change the light transmittance, and generates the visual effect similar to 'frosted glass'. Such a surface is easily wetted by a liquid having a specific viscosity and polarity (such as an organic adhesive), the scattering effect disappears after wetting, and the film of the wetted portion becomes clear immediately, resembling the "lens effect", whereby the pattern shape constituted by the wetted portion can be presented. The film has the effects that the film of the coating part of the glue A or the pattern part drawn by the glue B is clear and transparent, and objects behind the film can be clearly seen through the film; the film on the non-drawn portion of either glue a or glue B had a significant haze, and objects behind the film seen through it were hazy.
The single material patterned composite film of the invention is mainly made of single same high molecular material on each layer, can be used as a publicity board, such as an advertisement board placed in an advertisement column of each shopping mall, and can also be made into a packaging bag for various foods in a supermarket, wherein the single material patterned composite film can display all black and white patterns by two effects of 'ground glass' and 'clear'. The general composite film is made of various materials, once the composite film is printed or compounded by various materials, the plastic film can not be recycled as a pure material and can only be used as a filler or degraded for use, so that the waste is great.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The examples, in which specific conditions are not specified, were carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The materials used in the present invention are as follows:
polyethylene-1, designation JHM9455F, available from gilin petrochemicals;
polyethylene-2, trade name DFDA9085, available from tianjin petrochemicals;
polyethylene-3, designation 7042, available from Zhenhai refining;
polyethylene wax, grade 3920F, available from clariant;
502 glue, so called Li brand;
polyethylene terephthalate, designation 2030F, purchased from ceremonial chemical fiber;
the polyethylene three-layer composite film is self-made and is prepared by adopting a casting machine with Collin model E20T-RWT40-CR 136/230. The middle layer is made of 7042, the upper and lower layers are made of DFDA9085, and the processing temperature is 230 deg.C to obtain polyethylene three-layer composite film with width of 20cm and average total thickness of 80 μm.
The film preparation equipment such as blow molding, casting, biaxial stretching and the like is obtained by using conventional corresponding processing equipment, and the equipment parameters are conventional parameters which can enable the material to be processed into a continuous film in a conventional instrument and are not specially specified.
The present invention will be described in detail below by way of examples.
Example A1: polyethylene-1 was blown to a film thickness of 20 microns, designated A1-XA, and polyethylene-2 was cast to a film thickness of 30 microns, designated A1-XB1. And overlapping a layer of A1-XA and two layers of A1-XB1 according to the sequence of A1-XA, A1-XB1 and A1-XB1, smearing 502 glue between every two layers, and bonding after even smearing to obtain three layers of films, namely A1-XC. The rough surfaces of the two groups A1-XC were opposed and superimposed, and a solid circular pattern was applied between the two layers with polyethylene wax. Heating to 90 ℃ melts the polyethylene wax, whereupon the two groups A1-XC of films adhere, and the resulting film is designated A1.
Example A2: polyethylene-2 was cast into a film having a thickness of 20 μm and both sides were sanded with sandpaper and designated A2-XA, the other steps were the same as in example A1, and the film thus obtained was designated A2.
Example A3, the same as example A1, but with a pattern of hollow circles instead of solid circles smeared with polyethylene wax, the resulting film is designated A3.
Example A4 polyethylene terephthalate was biaxially stretched to form films, some of which were sanded on both sides and designated A4-XA, while those films that were not sanded were designated A4-XB. The other steps were the same as in example A1, and the film obtained was designated A4.
Example A5 polyethylene-1 was cast into a film having a thickness of 20 microns and one side was sanded, designated A5-XA, with the two groups of A5-XA having their rough sides facing and superimposed, and on one of the sides polyethylene wax printed in a heart-shaped pattern was adhered. The polyethylene wax is melted by heating to 90 ℃ and the film obtained is designated A5.
Example A6, blow molding polyethylene-1 to form a film with a thickness of 20 μm, which is denoted as A6-XA, laminating A6-XA and A6-XB, applying 502 glue between contact surfaces, uniformly applying and adhering, and thus obtaining a film denoted as A6-XC. The other steps were the same as in example A1, and the film obtained was designated A6.
Table 1 test effect:
Figure BDA0002230185470000081

Claims (16)

1. the single-material patterned composite film comprises two groups of films, wherein one surface of each group of films is a smooth surface, the other surface of each group of films is a rough surface, a patterned first adhesive layer is arranged between the rough surfaces of the two groups of films, each group of films is independently of a single-layer or multi-layer structure, the content of high molecular materials in each layer of film is more than 80wt%, the high molecular materials of the films are the same high molecular material, the first adhesive layer comprises an adhesive B, the adhesive B is selected from an organic adhesive, and the structural units of the components of more than 80wt% of the organic adhesive are the same as the structural units of the high molecular materials.
2. The single material patterned composite film of claim 1, wherein:
the content of the polymer material in each layer of film is more than 90 wt%.
3. The single material patterned composite film of claim 1, wherein:
when each group of films is of a multilayer structure, the structure is a multilayer co-extruded film, or the structure is a structure of an interlayer adhesive layer between the multilayer films in the group, or the combination of the two structures.
4. The single material patterned composite film of claim 1, wherein:
the high polymer material is selected from any one of polyethylene, polypropylene, polystyrene, polyvinyl chloride, polycarbonate and polyethylene terephthalate.
5. The single material patterned composite film of claim 3, wherein:
the interlayer adhesive layer comprises an adhesive A;
the adhesive A is selected from organic adhesives, and the structural units of the components with the weight percent of more than 80 percent of the organic adhesives are the same as the structural units of the high polymer materials.
6. The single material patterned composite film of claim 1 or 5, wherein:
the organic adhesive is selected from any one of acrylate, vinyl acetate or two co-polymer adhesives.
7. The single material patterned composite film of claim 1, wherein:
the surface roughness of the rough surface is more than 50nm;
the smooth surface has a surface roughness of less than 40nm.
8. The single material patterned composite film of claim 7, wherein:
the surface roughness of the rough surface is more than 100nm;
the surface roughness of the smooth surface is less than 30nm.
9. The single material patterned composite film of claim 1, wherein:
the monolayer film has an internal haze of less than 5%.
10. The single material patterned composite film of claim 9, wherein:
the monolayer film has an internal haze of less than 3%.
11. A method of preparing a single material patterned composite film according to any one of claims 1 to 10, characterized by comprising the steps of:
(1) Obtaining two groups of films of high polymer materials, one surface of each film is a smooth surface, and the other surface of each film is a rough surface;
(2) And (3) enabling the rough surfaces of the two groups of films to be opposite, drawing a pattern on at least one rough surface by using glue B or pasting the patterned glue B, and bonding the two groups of films together by using the glue B to obtain the single-material patterned composite film.
12. The method of claim 11, wherein the step of forming the patterned composite film comprises:
in the step (1), when each group of thin films are independently of a multilayer structure, obtaining a thin film with at least one rough surface, and marking as XA; obtaining at least one film with a smooth surface marked as XB; and optionally one or more films, coating glue A on the opposite surface of the XA rough surface, the optional two surfaces of the film and the opposite surface of the XB smooth surface, and sequentially bonding the layers by the glue A to obtain a group of films with one surface being the smooth surface and the other surface being the rough surface.
13. The method for producing a composite film according to claim 11, characterized in that:
the method for obtaining the smooth surface film is a tape casting method or a biaxial stretching method.
14. The method for producing a composite film according to claim 11, characterized in that:
the method for obtaining the film with the rough surface is a blow molding method or roughening the smooth surface of the film.
15. The method for producing a composite film according to claim 11, characterized in that:
the bonding comprises normal temperature bonding or high temperature bonding.
16. Use of a single material patterned composite film according to any of claims 1 to 10 in packaging bags, billboards.
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