CN111958958A - Super-hydrophobic food packaging material and preparation mold and preparation method thereof - Google Patents
Super-hydrophobic food packaging material and preparation mold and preparation method thereof Download PDFInfo
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- CN111958958A CN111958958A CN202010876136.4A CN202010876136A CN111958958A CN 111958958 A CN111958958 A CN 111958958A CN 202010876136 A CN202010876136 A CN 202010876136A CN 111958958 A CN111958958 A CN 111958958A
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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
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
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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
- B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
Abstract
The present disclosure provides a superhydrophobic food packaging material having a substrate layer, at least one surface of the substrate layer having a microstructure, the microstructure being partially or fully covered by a superhydrophobic material. The present disclosure also provides a mold for preparing the superhydrophobic food packaging material and a method of preparing the superhydrophobic food packaging material. The super-hydrophobic food packaging material disclosed by the invention can effectively prevent the adhesion of contents, and the super-hydrophobic layer is firm and reliable and is easy to prepare.
Description
Technical Field
The invention belongs to the field of high-performance materials, and particularly relates to a super-hydrophobic food packaging material and a preparation method thereof.
Background
At present, the inner layer film of paper, aluminum and plastic composite packages of foods such as milk and the like is made of materials such as PE, PP, CPP, PS and the like, and for contents with high viscosity such as yoghourt, honey, jam and the like, a plurality of products are always adhered and remained on the inner wall of the package when the contents are eaten, so that the contents are thrown away and wasted, and the contents are unsanitary and unsightly when people lick the contents, and great troubles are brought to consumers and manufacturers. Therefore, the super-hydrophobic food packaging material capable of preventing the adhesion of the contents has a great application prospect.
In the prior art, a super-hydrophobic material is sprayed on a substrate to prepare a super-hydrophobic food packaging material, but the preparation process is complex and difficult to control, and the problems of thicker super-hydrophobic coating and weak bonding force between the super-hydrophobic coating and the sprayed substrate exist, so that the consumed super-hydrophobic coating material is large in material amount during preparation, the process cost is high, large-area large-scale industrial production cannot be realized, and the prepared super-hydrophobic coating is not firm and is easy to drop to cause the super-hydrophobic failure of the coating and food pollution. Therefore, research into superhydrophobic food packaging materials is required to overcome the above problems.
Disclosure of Invention
Problems to be solved by the invention
In view of the defects that the existing super-hydrophobic food packaging material is complex in preparation process, high in cost and not suitable for industrial production, and the prepared coating is easy to fall off and lose efficacy and causes pollution to packaged objects, the invention provides a super-hydrophobic food packaging material and a preparation method thereof, so as to solve the problems in one aspect or multiple aspects of the prior art.
Means for solving the problems
In order to achieve the above object, the present disclosure provides a superhydrophobic food packaging material, which is characterized in that the superhydrophobic food packaging material has a substrate layer, at least one surface of the substrate layer has a microstructure, and the microstructure is partially or completely covered by the superhydrophobic material.
In a further embodiment of the present disclosure, there is provided the super hydrophobic food packaging material, wherein the microstructures are microprotrusions arranged in an array.
In a further embodiment of the present disclosure, there is provided the super-hydrophobic food packaging material, wherein the shape of the micro-protrusions is a polygonal pyramid, a polygonal frustum, a cone, a circular truncated cone, a cube, a cuboid, a cylinder, a semi-cone, a semi-circular truncated cone, or a birdcage.
In a further embodiment of the present disclosure, there is provided a super-hydrophobic food packaging material, wherein the micro-protrusions have a size of:
when the bottom surface of the micro-protrusion is round or semicircular, the radius of the bottom surface is 3 mu m-3.5mm, and when the bottom surface of the micro-protrusion is triangular, quadrangular or hexagonal, the side length of the bottom surface is 4 mu m-4 mm;
the height of the micro-bumps is 5 mu m-2 mm.
In a further embodiment of the present disclosure, there is provided a superhydrophobic food packaging material, when an included angle between a side wall and a bottom surface of the microprotrusions is greater than 90 °, the included angle between the side wall and the bottom surface of the microprotrusions is 120 ° ± 5 °.
In a further embodiment of the present disclosure, there is provided the super-hydrophobic food packaging material, wherein a distance between adjacent micro protrusions is 100nm to 1 mm.
The present disclosure also provides a mold for processing the superhydrophobic food packaging material of the present disclosure, wherein the mold surface has a micro-recessed structure arranged as an array.
In a further embodiment of the present disclosure, there is provided a mold, wherein the micro-recessed structure has the following dimensions:
when the top surface of the micro-recess is round or semicircular, the radius of the top surface is 3 mu m-3.5mm, and when the top surface of the micro-recess is triangular, quadrangular or hexagonal, the side length of the top surface is 4 mu m-4 mm;
the depth of the micro-pits is 5 mu m-2 mm.
In a further embodiment of the present disclosure, there is provided a mold, wherein the distance between adjacent micro-recesses is 100nm to 1 mm.
The present disclosure also provides a preparation method of the super-hydrophobic food packaging material, which is characterized by comprising the following steps:
a step of preparing a mould: processing a micro-concave structure on the surface of the material of the die body;
the preparation method of the super-hydrophobic coating comprises the following steps: taking a super-hydrophobic material, and spraying, dipping or brushing the surface of the mold with the micro-concave structure prepared in the mold preparation step to obtain a mold coated with the super-hydrophobic material;
an embossing step: and (3) stamping the substrate material by using the mold coated with the super-hydrophobic material to prepare the super-hydrophobic food packaging material.
ADVANTAGEOUS EFFECTS OF INVENTION
In summary, the invention has the following advantages:
1. the super-hydrophobic food packaging material disclosed by the invention has super-hydrophobic characteristics on various high-adhesion fluids such as yoghourt, honey, jam and the like, the static contact angle is more than 150 degrees, and the rolling angle is less than 10 degrees, so that the adhesion of contents can be effectively prevented;
2. the super-hydrophobic food packaging material has a special microstructure, so that the solid-liquid contact area of the surface can be further reduced, and the super-hydrophobic property of the surface is improved; in addition, on one hand, the use amount of the super-hydrophobic coating is saved, on the other hand, the microstructure plays a role in protecting the hydrophobic nano material, the bonding firmness degree between the super-hydrophobic coating and the packaging substrate material is increased in the imprinting process, and the super-hydrophobic layer can be effectively prevented from being damaged in the use process;
3. the mold of the super-hydrophobic food packaging material can be recycled for many times, has simple process and convenient operation, and is suitable for the requirement of large-scale industrial production;
4. the substrate material and the mould of the super-hydrophobic food packaging material can be made of various materials, and the application range is wide.
Drawings
The present disclosure is described in detail in terms of one or more various embodiments with reference to the following figures. The drawings are provided to facilitate an understanding of the disclosure and should not be taken to limit the breadth, scope, size, or applicability of the disclosure. For ease of illustration, the drawings are not necessarily drawn to scale.
FIG. 1 is a schematic view of the surface microstructure of the superhydrophobic food packaging material of the present disclosure;
FIG. 2 is a scanning electron micrograph of a mold surface used to make a microstructure;
FIG. 3 is a comparison graph of an inverted rectangular pyramid microstructure mold before and after spraying hydrophobic particles;
FIG. 4 is a schematic diagram of a direct imprint process for preparing a superhydrophobic food packaging material;
FIG. 5 is a schematic diagram of a rolling press for preparing a super-hydrophobic food packaging material;
FIG. 6 is a scanning electron microscope image of a superhydrophobic composite film material in an application comparative test.
Detailed Description
Overall structure of super-hydrophobic food packaging material
The invention provides a super-hydrophobic food packaging material. The material comprises a substrate layer, wherein the upper surface of the substrate layer is provided with a microstructure, or the upper surface and the lower surface of the substrate layer are both provided with microstructures; the superhydrophobic material covers the microstructures on the base layer partially or completely.
Base layer
The material of the substrate layer is not particularly limited, and may be selected from common materials for food packaging, such as glass, plastic, ceramic, cardboard, composite materials (e.g., a combination of paper, plastic film, aluminum foil, etc.), and the like.
Microstructure
At least one surface of the sheet-like base layer has a microstructure. Specifically, the microstructure may be a micro-protrusion arranged in an array, as shown in fig. 1, the specific shape of the micro-protrusion may be a shape in which an included angle between a sidewall and a plane of the substrate layer is greater than 90 °, such as a polygonal pyramid (e.g., a triangular pyramid, a rectangular pyramid, a hexagonal pyramid, etc.), a polygonal frustum (e.g., a triangular frustum, a rectangular frustum, a hexagonal frustum, etc.), a cone, a circular truncated cone, etc.; or, the shape of the micro-protrusions can also be a shape with an included angle of 90 degrees between the side wall and the plane of the substrate layer, such as a cube, a cuboid, a cylinder, a birdcage and the like; the micro-bulge can also be in a shape that the included angle between one part of the side wall and the plane of the substrate layer is 90 degrees, and the included angle between the other part of the side wall and the plane of the substrate layer is more than 90 degrees, such as a semi-circular truncated cone and a semi-cone.
Regarding the size of the microprotrusions, when the base surfaces of the microprotrusions are circular or semicircular, the base surfaces preferably have a radius of 3 μm to 3.5mm, and when the base surfaces of the microprotrusions are triangular, quadrangular or hexagonal, the base surfaces preferably have a side length of 4 μm to 4 mm. The height of the microprotrusions is preferably 5 μm to 2 mm. When the included angle between the side wall of the micro-protrusion and the bottom surface is greater than 90 degrees, the included angle between the side wall of the micro-protrusion and the bottom surface is preferably 120 degrees +/-5 degrees. The spacing between adjacent microprotrusions is preferably 100nm to 1 mm.
Super-hydrophobic layer
The super-hydrophobic layer covers the microstructure on the base layer partially or completely, so that super-hydrophobic performance is provided for the food packaging material. Under the protection of the microstructure, the super-hydrophobic layer can be firmly bonded with the substrate layer. The material of the super-hydrophobic layer can be edible polysaccharide, edible wax, or other super-hydrophobic materials which can contact with food. The thickness of the super-hydrophobic layer is preferably 200nm to 50 μm.
Die set
In order to facilitate rapid processing of the substrate layer microstructure of the superhydrophobic food material, the present disclosure also provides a mold. The surface of the mold has a micro-recessed structure corresponding to the micro-raised structure of the substrate layer, so that the micro-raised structure can be formed on the substrate layer when the mold is pressed on the substrate layer. As shown in fig. 2, the micro-recesses on the mold surface may be inverted polygonal pyramids (e.g., inverted triangular pyramids, inverted rectangular pyramids, inverted hexagonal pyramids, etc.), inverted polygonal platforms (e.g., inverted triangular prism platforms, inverted rectangular prism platforms, inverted hexagonal prism platforms, etc.), inverted cones, inverted truncated cones, etc.; or the shape of the micro-depression can be a cube, a cuboid, a cylinder, an inverted birdcage shape, an inverted semicircular platform, an inverted semicircular cone and the like.
The size of the micro-pits on the surface of the mold can be determined according to the size of the micro-bumps on the substrate layer to be processed. For example, when the top surface of the micro-recess is circular, the radius of the top surface circle is preferably 3 μm to 3.5mm, and when the top surface of the micro-recess is triangular, quadrangular or hexagonal, the side length of the top surface is preferably 4 μm to 4 mm. The depth of the micro-pits is preferably 5 μm-2 mm. When the included angle between the side wall of the micro-recess and the top surface is less than 90 degrees, the included angle between the side wall of the micro-recess and the top surface is preferably 60 degrees +/-5 degrees. The spacing between adjacent dimples is preferably in the range 100nm to 1 mm.
The material of the die body can be selected from metal, ceramic, plastic, silicon chip, etc., and can be selected according to the specific situation of the substrate layer to be processed.
The shape of the mold body is not particularly limited, but is preferably a flat plate, and the base layer can be directly imprinted; or preferably also in the form of a roll, the substrate layer can be roll embossed.
Preparation method of super-hydrophobic food packaging material
In order to conveniently and rapidly produce the superhydrophobic food packaging material of the present invention, the following preparation method can be selected.
(1) Preparing a mould; the mold with the required micro-concave structure is manufactured by processing the surface of a mold body material such as metal, ceramic, plastic, silicon chip and the like by utilizing the technologies such as photoetching, micro-milling, cold/hot pressing, femtosecond laser etching and the like.
(2) Preparing a super-hydrophobic coating: one method is to select a commercially available super-hydrophobic coating or to prepare a self-prepared super-hydrophobic coating (such as a coating containing silicone super-hydrophobic particles, polysaccharide edible wax super-hydrophobic particles or chitosan super-hydrophobic particles), and uniformly spray the surface of the prepared mold with the micro-recessed structure for the subsequent imprinting step (as shown in fig. 3). Another method is to prepare a super-hydrophobic suspension (such as a mixed suspension of coffein and edible wax), dip-coat the prepared mold with the micro-recessed structure, and perform rolling impression while dip-coating. The surface of the mold with the micro-concave structure can also be brushed with the super-hydrophobic coating.
(3) And (3) embossing: taking a substrate material to be processed, and carrying out pressure imprinting on the substrate material by using a mold coated with a hydrophobic coating (as shown in figure 4), or carrying out rolling imprinting on the substrate material by using the mold coated with the hydrophobic coating (as shown in figure 5), wherein a micro-protrusion structure is processed on the surface of the substrate material, and simultaneously, a part of the super-hydrophobic coating on the mold is transferred to the surface of the substrate material to form a super-hydrophobic layer firmly connected to the microstructure of the substrate material, so that the super-hydrophobic food packaging material with a regular microstructure is prepared.
Embodiments of the present disclosure will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present disclosure and should not be construed as limiting the scope of the present disclosure. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
Example 1
(1) Preparing a silicon-based inverted rectangular pyramid microstructure mould by utilizing photoetching and wet etching technologies:
taking SiO2The silicon wafer/Si is processed as follows: plasma treatment (100w,30min) -baking (260 ℃,30min) -spin-coating photoresist (3500rpm) -prebaking (110 ℃, 1min) -exposure (8000wcm-2,6s) -development (2.78% TMAH,24s) -postbaking (100 ℃,3min) -etching silicon dioxide (BOE, buffer-oxide-etch, 40% NH)4F: 40% HF ═ 6:1, etch rate 2nms-1,3min) -resist removal (boiling in acetone) -wet etching of silicon (75 ℃, 25% TMAH) -removal of the etch resist silicon dioxide (BOE,3 min).
(2) And modifying the silicon dioxide nano particles by adopting an organic silicon super-hydrophobic coating and utilizing a vapor deposition method to prepare the super-hydrophobic silicon-based inverted rectangular pyramid microstructure mould. The specific method for preparing the organic silicon super-hydrophobic coating comprises the following steps: 1g of silicon dioxide nano particles with the size of 100nm in the market are selected, placed in a vacuum drier together with a glass container filled with 200 mu L of hexadecyl siloxane, kept for reacting for 2 hours in vacuum, and then configured into 1mg/ml ethanol suspension by using the hydrophobized silicon dioxide nano particles, so that the organic silicon hydrophobic coating can be obtained. The silicon-based inverted pyramid microstructure mold was sprayed and the excess sprayed was removed with a sharp stainless steel blade.
(3) The silicon-based inverted rectangular pyramid microstructure mold sprayed with the organic silicon super-hydrophobic coating is utilized to directly imprint a paper-aluminum-plastic composite film for food packaging for 5min by a 2-ton hydraulic press at the temperature of 60 ℃, so that a super-hydrophobic aluminum foil film with a regular rectangular pyramid micro-convex structure is prepared, the height of the rectangular pyramid microstructure is 0.5mm, the side length of the bottom surface is 0.58mm, the distance between adjacent rectangular pyramids is 10 mu m, and the angle between the major side wall and the bottom surface is 120 degrees.
Example 2
(1) Processing an inverted semicircular platform microstructure array on the surface of a cylindrical titanium alloy roller by using a femtosecond laser technology to prepare a roller-shaped metal mold with an inverted semicircular platform microstructure:
firstly, carrying out ultrasonic treatment on the titanium alloy in an acetone solution for 5min, removing possible pollution impurities on the surface of the titanium alloy, and drying the titanium alloy for later use. The adopted laser light source outputs linear polarization pulse laser with the central wavelength of 780nm, the repetition frequency of 1kHz and the pulse width of 120 fs. In the laser scanning process, the interval between adjacent scanning lines was set to 30 μm and the scanning speed was set to 250 μm/s. And then soaking the titanium alloy sheet subjected to femtosecond laser scanning in an acetone solution for ultrasonic treatment for 5min, taking out and naturally drying to obtain the inverted semicircular table microstructure titanium alloy mold with the large side wall angle of 125 degrees.
(2) The self-made super-hydrophobic suspension dip-coating method is adopted, and the preparation details of the super-hydrophobic suspension are as follows: adding 1.2g coffee bean powder into 35g mixed solution of ethanol and water at a volume ratio of 1:1, stirring and dispersing, continuing stirring at 100 deg.C for 5h, naturally cooling and filtering to obtain filtrate, and freeze drying the filtrate to obtain caffeine. Heating and melting 0.6g of honeycomb wax, adding 0.5g of coffein, heating to 85 ℃, continuously stirring for 1 hour, then adding a mixed solution of 18g of acetone and ethanol in a volume ratio of 1:1, and stirring for 20 minutes while the mixture is hot at 2700r/min to obtain a super-hydrophobic suspension for later use.
(3) The super-hydrophobic suspension is adopted to dip-coat a rotating roller-shaped mould with an inverted semi-circular table microstructure, and the normal-temperature rolling impressing and packaging composite material (paper-aluminum-plastic composite film) is carried out at the same time. Horizontally fixing a roller-shaped die with an inverted semi-circular table microstructure, rotating at the speed of 2r/min, partially immersing 1/4 parts below the die into the super-hydrophobic suspension, loading a packaging composite material which is conveyed at a constant speed of 5m/s and is consistent with the rotation direction of the die above the die, and carrying out rolling imprinting to obtain the super-hydrophobic food packaging material with a regular semi-circular table microstructure, wherein the height of the semi-circular table microstructure is 0.6mm, the angle of a large side wall is 125 degrees, and the radius of a bottom semi-circle is 0.5mm, as shown in fig. 6.
Example 3: viscous liquid adhesion surface effect difference test
An application comparison test was performed on the super-hydrophobic paper-aluminum-plastic composite film having the inverted half-truncated cone microstructure prepared in example 2 and on a composite film (non-treated composite film) of the same material but having no micro-structure and no super-hydrophobic coating.
The super-hydrophobic paper-aluminum-plastic composite film prepared in example 2 and the non-treated composite film were tested by use tests using commercially available yogurt and all-flower honey. The test method comprises the following steps: selecting a 5 multiplied by 5cm super-hydrophobic paper-aluminum-plastic composite film and a non-treatment composite film to be horizontally placed, weighing 1g of yoghourt (or all-flower honey) to be placed on the super-hydrophobic composite film and the non-treatment composite film, inclining the composite film, and observing the flowing behavior of the yoghourt (all-flower honey) along with the increasing of the inclination angle.
And (3) test results: when the inclination angle of the super-hydrophobic paper-aluminum-plastic composite film is about 5 degrees, the yoghourt flows without residue, and when the inclination angle is about 6 degrees, the all-flower honey flows without residue. When the inclination angle of the non-processed composite membrane is larger than 35 degrees, the yoghourt and the all-flower honey start to flow, and when the inclination angle reaches 90 degrees, the non-processed composite membrane still has adhesive residues. Test results show that the super-hydrophobic packaging material prepared by the invention has good effect of preventing viscous liquids such as yoghourt, honey and the like from adhering.
Example 4: mechanical Property test for use with packaging Material
The superhydrophobic paper-aluminum-plastic composite film prepared in example 2 was taken, and a composite film coated with the same superhydrophobic coating but without a microstructure processed on the same base material was taken to perform a mechanical property test performance comparison test.
The 6 x 6cm size super-hydrophobic paper-aluminum-plastic composite film of example 2 and the microstructure-free hydrophobic composite film were selected, and friction damage in the actual use process was simulated by a stainless steel blade friction test. A stainless steel blade with the length of 3cm is adopted, two aluminum foil film packaging materials are repeatedly worn back and forth by 90 degrees vertically and 3cm in a single pass, when the friction times reach 3 times, the coating damage phenomenon of the microstructure composite film is avoided, the contact angle between the microstructure composite film and water is smaller than 100 degrees, and after the super-hydrophobic aluminum foil film is repeatedly rubbed for 30 times, the coating is still complete, and the contact angle between the super-hydrophobic aluminum foil film and water is larger than 140 degrees. The test result shows that: the microstructure processed on the surface of the substrate plays a role in protecting the hydrophobic coating, and the hydrophobic coating is not easy to fall off and damage in use.
While the features of the present invention have been shown and described in detail with reference to the preferred embodiments, those skilled in the art will understand that other changes may be made therein without departing from the spirit of the scope of the invention. Likewise, the various figures may depict exemplary architectures or other configurations for the present disclosure, which are useful for understanding the features and functionality that may be included in the present disclosure. The present disclosure is not limited to the example architectures or configurations shown, but may be implemented using a variety of alternative architectures and configurations. Additionally, while the present disclosure has been described above in terms of various exemplary embodiments and implementations, it should be understood that the various features and functionality described in one or more of the individual embodiments are not limited in their applicability to the particular embodiment to which they pertain. Rather, they may be applied, individually or in some combination, to one or more other embodiments of the disclosure, whether or not such embodiments are described and whether or not such features are presented as being part of the described embodiments. Thus, the breadth and scope of the present disclosure should not be limited by any of the above-described exemplary embodiments.
Claims (10)
1. A superhydrophobic food packaging material, characterized in that the superhydrophobic food packaging material has a substrate layer, at least one surface of the substrate layer having a microstructure, which microstructure is partially or completely covered by the superhydrophobic material.
2. The superhydrophobic food packaging material of claim 1, wherein the microstructures are microprotrusions arranged in an array.
3. The superhydrophobic food packaging material of claim 2, wherein the shape of the microprotrusions is a polygonal pyramid, a polygonal frustum, a cone, a truncated cone, a cube, a cuboid, a cylinder, a semi-cone, a semi-truncated cone, or a birdcage.
4. The superhydrophobic food packaging material of claim 2 or 3, wherein the dimensions of the microprotrusions are:
when the bottom surface of the micro-protrusion is round or semicircular, the radius of the bottom surface is 3 mu m-3.5mm, and when the bottom surface of the micro-protrusion is triangular, quadrangular or hexagonal, the side length of the bottom surface is 4 mu m-4 mm;
the height of the micro-bumps is 5 mu m-2 mm.
5. The superhydrophobic food packaging material of any of claims 2-4, wherein the sidewalls of the microprotrusions are angled 120 ° ± 5 ° with respect to the bottom surface when the sidewalls of the microprotrusions are angled more than 90 ° with respect to the bottom surface.
6. The superhydrophobic food packaging material of any one of claims 2-5, wherein a spacing between adjacent microprotrusions is 100nm-1 mm.
7. A mould for processing the superhydrophobic food packaging material according to any of claims 1-6, wherein the mould surface has a micro-recessed structure arranged as an array.
8. The mold of claim 7, wherein the dimple features have dimensions of:
when the top surface of the micro-recess is round or semicircular, the radius of the top surface is 3 mu m-3.5mm, and when the top surface of the micro-recess is triangular, quadrangular or hexagonal, the side length of the top surface is 4 mu m-4 mm;
the depth of the micro-pits is 5 mu m-2 mm.
9. The mold of claim 7 or 8, wherein the distance between adjacent micro-recesses is 100nm to 1 mm.
10. The method for preparing a superhydrophobic food packaging material according to any one of claims 1-6, comprising the steps of:
a step of preparing a mould: processing a micro-concave structure on the surface of the material of the die body;
the preparation method of the super-hydrophobic coating comprises the following steps: taking a super-hydrophobic material, and spraying, dipping or brushing the surface of the mold with the micro-concave structure prepared in the mold preparation step to obtain a mold coated with the super-hydrophobic material;
an embossing step: and (3) stamping the substrate material by using the mold coated with the super-hydrophobic material to prepare the super-hydrophobic food packaging material.
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