Preparation method of high-barrier degradable environmentally friendly packaging material, packaging material and packaging article

Abstract

The present application provides a method for preparing a high-barrier, degradable, and environmentally friendly packaging material, as well as packaging materials and packaging articles. The method includes transferring and bonding a prefabricated high-resistance layer composed of a water-based, easily peelable substrate layer, a coating layer, and a water-based porous coating layer onto a paper layer to produce a plastic-free, high-barrier, degradable, and environmentally friendly packaging material. The multi-film prefabricated high-resistance layer, composed of multiple layers such as a second coating layer and a second water-based porous coating layer, has ultra-high barrier properties. The present application can save more than 68% of vacuum pump energy consumption. The resulting high-barrier, degradable, and environmentally friendly packaging material and its packaging are degradable, pollution-free, and have ultra-high barrier properties.

Description

Technical Field

[0001] The present application belongs to the technical field of environmentally friendly packaging materials, and relates to paper-based packaging materials such as liquid food, solid food, powdered food, medicine blisters, cigarette lining paper, etc., and specifically relates to a method for preparing a high-barrier, degradable, environmentally friendly packaging material, as well as packaging materials and packaging articles. Background Art

[0002] The "Regulations on the Prohibition of Disposable Non-degradable Plastic Products in the Hainan Special Economic Zone" was promulgated and implemented on December 31, 2019. This is China's first province-wide plastic ban. On January 16, 2021, the Ministry of Ecology and Environment issued and implemented the "Opinions on Further Strengthening the Control of Plastic Pollution", proposing a "Chinese solution" for plastic pollution control. China will orderly ban and restrict the production, sale and use of some plastic products, and actively promote easily recyclable, recyclable and degradable alternative products. In order to control plastic pollution and promote environmental protection development, the inventors of this application have conducted extensive and in-depth theoretical research, experimental testing, process and equipment development on current packaging materials such as liquid food packaging boxes, pharmaceutical blister packaging, and cigarette lining paper for more than two years, and discovered some problems with the existing technology.

[0003] The Chinese invention patent application (CN111655474A) filed by Tetra Pak Laval Group and Finance Co., Ltd. of Switzerland, titled "Barrier film, laminated packaging material comprising the same, and packaging container made therefrom (hereinafter referred to as Background Art 1)," is a highly advanced technical solution for an environmentally friendly, coated packaging material. However, the packaging material still utilizes a significant amount of non-biodegradable polyester film substrate to enhance its barrier properties against oxygen, water vapor, chemicals, aromas, and other substances. In other words, Background Art 1 still utilizes a significant amount of non-biodegradable polyester film substrate, failing to fully address environmental concerns.

[0004] Shandong Yantai Boyuan Technology Materials Co., Ltd.'s Chinese utility model patent (CN210116793U) is titled "A high-barrier paper-based packaging bag (hereinafter referred to as background technology 2)". Jiangsu Little Green Packaging Co., Ltd. filed a Chinese invention patent application (CN113910733A) titled "A single-layer barrier heat-sealed packaging paper and its preparation method (hereinafter referred to as background technology 3)". Nanjing Jinling Gold Foil Co., Ltd. filed a Chinese utility model patent (CN205171271U) titled "A high-resistance, environmentally friendly aluminum-coated paper (hereinafter referred to as background technology 4)". Shanghai Jinye Packaging Materials Co., Ltd. filed a Chinese invention patent application (publication number CN1789478A) titled "The production process of vacuum aluminum-coated paper (hereinafter referred to as background technology 5)". Kunshan Shengli Packaging Materials Co., Ltd. filed a Chinese invention patent application (CN105463940A) titled "The production method of environmentally friendly vacuum aluminum-coated laser paper (hereinafter referred to as background technology 6)". The Chinese invention patent application (publication number CN109338802A) submitted by Jiaxing Tianyue Packaging Co., Ltd. is titled "A production process for aluminum-coated paper (hereinafter referred to as background technology 7)". The Chinese invention patent (CN102966007B) filed by Shaoxing Jingshengguang Information Technology Co., Ltd. is titled "A method for preparing Fresnel lens vacuum aluminum-coated paper and the product obtained therefrom (hereinafter referred to as background technology 8)". The Chinese utility model patent (CN215243494U) filed by Anhui Zijiang Aluminum Spraying Environmental Protection Materials Co., Ltd. is titled "A multi-layer vacuum aluminum-coated laser transfer film composite paper (hereinafter referred to as background technology 9)". The Chinese utility model patent (CN211689669U) filed by Yantai Boyuan Technology Materials Co., Ltd. is titled "A high-temperature resistant vacuum aluminum-coated laser paper (hereinafter referred to as background technology 10)". The Chinese utility model patent (CN2755161Y) filed by Shanghai Fangyin Lifeng Printing and Packaging Co., Ltd. is titled "Vacuum aluminum-coated paper (hereinafter referred to as background technology 11). Boyuan Technology Materials (Yantai) Co., Ltd.'s Chinese invention patent (CN102002894B) is titled "A Vacuum Aluminum-Coated Frosted Cardboard with Electron Beam Cured Coating and Its Production Method (hereinafter referred to as Background Art 12)." This background art provides several patented concepts for packaging materials consisting of a heat-seal layer, a paper layer, a coating layer (to replace the current aluminum foil layer), and a barrier coating. These technologies all involve direct coating of the paper surface.

[0005] A Chinese invention patent (CN106087590B) authorizes the disclosure of "a wrapping paper with a colorful halo effect and its production process," but this is a decorative paper with a colorful halo effect and does not fall into the same technical field as the present application. Japanese patent JP2002316384A discloses an environmentally friendly packaging material with excellent gas barrier properties, flexibility, and no environmental pollution. However, this still uses a large amount of non-biodegradable polyester film substrate, and does not completely solve the environmental problem.

[0006] When implementing their proposed technology, the applicant encountered three major technical challenges: First, the barrier performance of the process using aluminum directly coated on paper was very low. Liquids such as juice and milk packaged in the bags had a shelf life of no more than three months, significantly shorter than that of existing packaging materials using aluminum foil. Analysis and research revealed that the low barrier performance was due to the high moisture content of paper, typically exceeding 6%, making it difficult to completely remove moisture even through vacuum heating and dehumidification, consuming significant amounts of heat energy. When aluminum is directly coated on paper, even trace amounts of residual moisture vaporize during the vapor deposition process and break through the deposited coating, forming tiny perforations in the coating, leading to air leakage and a significant reduction in barrier performance. Second, the patented concept of using oxides such as SiO2 and Al2O3 as high-barrier coatings for direct coating on packaging materials (Background Arts 2 and 3) was unimplementable and lacked practicality within the patented sense. The specific reason is that oxides such as Si02 and AL2O3 can only be deposited using the electron gun evaporation method, and the vaporization temperature is above 3000°C. At this extremely high temperature, on the one hand, the paper (low thermal conductivity) cannot dissipate heat and cool down quickly, and the paper surface will be coked, resulting in the inability to continue production; on the other hand, during the vapor deposition process, the residual moisture in the paper will vaporize when heated, break through the coating being vapor deposited, and form very small water vapor perforations on the coating, causing the coating to leak and the barrier performance to be greatly reduced. Third, the degree of vacuum is one of the indicators that must be strictly required during vacuum coating. It has a direct relationship with the color, wear resistance, firmness and other qualities of the coated product. Since the water content of paper is relatively high, it is usually above 6%. Due to the presence of 6% water in the paper, when evacuating, even if the vacuum pump increases its power by three times, it is difficult to reach 10 -3 The vacuum requirement of 10000 mpa leads to high energy consumption, low production speed, low efficiency and high scrap rate. Fourthly, due to the water vapor permeability of the coating, the barrier performance is very low, so it can only be used as decorative paper with a metallic luster.

[0007] To sum up, how to prevent the coating from being perforated by water vapor, how to prevent the paper surface from being charred, and how to reduce the energy consumption of the vacuum pump in order to produce a high-barrier, biodegradable and environmentally friendly packaging material with similar performance to the current aluminum foil has always been a technical challenge facing researchers in environmentally friendly packaging materials. Summary of the Invention

[0008] One of the purposes of this application is to provide a method for preparing a high-barrier, degradable, and environmentally friendly packaging material to prevent the coating layer from being perforated by water vapor and to produce a high-barrier, degradable, and environmentally friendly packaging material with performance similar to that of current aluminum foil.

[0009] The second purpose of this application is to provide a high-barrier, degradable and environmentally friendly packaging material to prevent the coating layer from being perforated by water vapor, and to produce a high-barrier, degradable and environmentally friendly packaging material with performance similar to that of current aluminum foil.

[0010] The third purpose of this application is to provide a high-barrier, degradable and environmentally friendly packaging material to prevent the coating layer from being perforated by water vapor, and to produce a high-barrier, degradable and environmentally friendly packaging material with performance similar to that of current aluminum foil.

[0011] To achieve one of the above objectives, the present invention provides a method for preparing a high-barrier, degradable and environmentally friendly packaging material as follows.

[0012] A method for preparing a high-barrier, degradable, and environmentally friendly packaging material comprises laying a coating layer and a barrier coating on a paper layer; the method is characterized in that it comprises the following process steps:

[0013] S1. Use PET or BOPP films with high tensile strength (good thermal stability) and smooth surface (such as PET film) as the carrier layer, first (under normal pressure) lay a water-based easy-to-peel backing layer (the peeling force is preferably 0.1-0.2N / 25mm) on the back of the carrier layer; then (put the carrier layer in a vacuum chamber) vapor-deposit SiO2 and / or AL2O3 and other coating layers on the easy-to-peel backing layer in the vacuum chamber (this is the first time to put the coating in the vacuum chamber); then (take out the carrier layer from the vacuum chamber, under normal pressure) apply a (preferably water-based) porous coating layer on the coating layer; the easy-to-peel backing layer, the coating layer and the porous coating layer (or multiple layers) together constitute a (single coating layer) prefabricated high-resistance (barrier) layer temporarily covering the carrier layer, so that it can be peeled off and used in subsequent steps. The reason for applying a pore-filling coating here is that during the vapor deposition process, the coating layer will still form sand holes caused by many unexpected factors such as dust. In order to fill the sand holes and improve the barrier performance, and also to protect the coating layer from accidental scratches by the roller surface, a technical measure of applying a pore-filling coating is adopted here. Research shows that a mixed solution made from three chemical raw materials, namely 50% methyl orthosilicate, 30% V-aminopropyltriethoxysilane, and 20% zirconium propoxide, is applied to the coating layer, heated to 106°C and held for 5-7 seconds before being rolled up. After rolling up, it is kept warm in a 65°C insulation box for 7-8 hours, and then taken out and naturally cooled after it is fully matured. This can form a water-based pore-filling coating with very excellent performance.

[0014] S2. Applying a high-barrier (preferably water-based) composite glue layer onto the prefabricated high-resistance layer to composite the prefabricated high-resistance layer with a paper layer (rather than a plastic film layer) and drying the composite glue layer; then peeling off and recycling the carrier layer; allowing the prefabricated high-resistance layer to be peeled off, retained, and bonded to the paper layer, thereby forming a plastic-free high-resistance (degradable and environmentally friendly packaging) material together with the paper layer;

[0015] S3. It is best to apply a barrier coating (water-based and capable of direct contact with food) on the prefabricated high-resistance layer (made of plastic-free high-resistance material).

[0016] In this way, on the one hand, because the coating layer is formed in advance on a dedicated carrier layer without any moisture, the traditional process of directly vapor-depositing a paper layer with a high moisture content in Background Technology 2-12 is abandoned, so there will be no water vapor perforation during the vapor deposition process; on the other hand, when the carrier layer and the prefabricated high-resistance layer thereon are compounded with the paper layer, even if there is water vapor, it is difficult to break through the already solidified high-strength coating layer. For this reason, the process method of the present application has been able to successfully produce a high-barrier, degradable and environmentally friendly packaging material; on the other hand, because the carrier layer is made of plastic material and has no moisture in it, it is easy to reach 10 when vacuuming. -3 The vacuum requirement of mpa is reduced by more than 68% compared with background technology 2-12, and the production speed, efficiency and scrap rate of the vacuum pump are high.

[0017] In order to enable the plastic-free high-resistance material and plastic-free ultra-high-resistance material produced by the above-mentioned process method to be used to make heat-sealed packaging materials such as milk cartons, it is desirable that the method for preparing the high-barrier degradable and environmentally friendly packaging material is characterized in that a heat-sealing adhesive coating (preferably water-based) is applied on the back of the paper layer.

[0018] Preferably, the method for preparing the high-barrier, degradable and environmentally friendly packaging material is characterized in that: a high-barrier composite glue layer (also known as an adhesive layer) is applied between the porous coating and the paper layer; (wherein, the paper layer is preferably made of breathable and moisture-absorbing paper so that the moisture in the composite glue layer can pass through and evaporate); used to retain and bond the prefabricated high-resistance layer to the paper layer to improve the barrier properties of the packaging material.

[0019] During the implementation of the above process, it was found that after the carrier layer was peeled off, some random micropores (due to scratches or dust punctures) would inevitably appear in the coating layer that was retained and adhered to the paper layer. These micropores would also cause the coating layer to leak air and significantly reduce its barrier performance, making its (water vapor) air permeability ≥2g / m 2 / 24h. To prevent the formation of these micropores, the applicant invested over a million yuan in research and development, conducting repeated experiments using the conventional technique of thickening the film once. These tests revealed that this technique alone was ineffective in preventing the formation of these micropores. Surprisingly, the researchers experimented with the following innovative process, achieving superior airtightness.

[0020] Preferably, the method for preparing the high-barrier degradable environmentally friendly packaging material is characterized by: further compounding the plastic-free high-resistance material with the prefabricated high-resistance layer on the carrier layer and drying; then peeling off and recycling the carrier layer; allowing the newly added prefabricated high-resistance layer to be peeled off, retained and bonded to the prefabricated high-resistance layer already on the plastic-free high-resistance material to form a prefabricated high-resistance layer having multiple (preferably 2-3 layers) prefabricated high-resistance layers (water vapor permeability ≤ 0.005g / m 2 / 24h) plastic-free ultra-high resistance material. Tests show that the water vapor permeability of this plastic-free ultra-high resistance material can easily reach ≤0.005g / m 2 / 24h extremely high technical level.

[0021] In this way, inside the plastic-free ultra-high resistance material, the air leakage holes (micropores, sand holes, water vapor perforation, etc.) on the upper and lower adjacent coating layers are (in most cases) misaligned with each other (no overlap, the probability of complete overlap is almost zero, and research shows that the overlap rate is ≤10 -7 . And its leakage holes are blocked by the adjacent coating layer instead of being compensated by the organic barrier coating. The leakage path between the two nearest leakage holes in the upper and lower layers must be very long, so the barrier performance will be greatly improved. Comparative experiments show that the barrier performance of plastic-free ultra-high resistance materials is several times higher than that of plastic-free high-resistance materials of the same thickness. For example: milk and juice filled in plastic-free high-resistance material packaging bags of the same thickness have a shelf life of up to 3 months, while milk and juice filled in plastic-free ultra-high resistance material packaging bags of the same thickness have a shelf life of more than 12 months, and will not deteriorate even for 3 years.

[0022] Preferably, the method for preparing the high-barrier degradable environmentally friendly packaging material is characterized in that: in the multiple prefabricated high-resistance layers, the micropores, sand holes and water vapor perforations on the upper and lower coating layers are staggered with an overlap rate of ≤10 -7 .

[0023] To prevent the formation of these micropores, the applicant invested over a million yuan in research and development, conducting repeated experiments using the conventional technique of thickening the film once. These tests revealed that this technique alone did not prevent the formation of these micropores. Surprisingly, the researchers also attempted another innovative process, which achieved comparable airtightness.

[0024] It is desirable that the method for preparing the high-barrier, degradable and environmentally friendly packaging material is characterized in that: the surface of the paper layer is coated in advance, and the coated surface is pressed against a highly polished (e.g., chrome-plated) high-gloss drying cylinder for pressure drying to form a smooth and flat paper surface (e.g., smoothness ≥ 1000s); preferably, a belt pressure mechanism is made to use a belt to press the paper layer against the high-gloss drying cylinder for delayed pressure drying to further improve the smoothness of the paper surface. In this way, since there are very few burrs, spots, and micro-pits on the surface of the paper layer, after the prefabricated high-resistance layer is compounded with the paper layer and the supporting layer is peeled off, the micropores generated on the plastic-free ultra-high-resistance material produced will be very few. Tests show that the water vapor permeability of the plastic-free ultra-high-resistance material produced can easily reach ≤0.005g / m 2 / 24h extremely high technical level.

[0025] While the barrier properties of the aforementioned "plastic-free ultra-high-resistance material" are improved, its production process is quite complex, requiring multiple layers of lamination and peeling, increasing carrier layer waste by 200-300%, and consuming significant energy. Further research has shown that the following process, which involves multiple depositions onto the same carrier layer, achieves excellent barrier and energy savings. Furthermore, the production process is relatively simple, offering high efficiency and requiring only one carrier layer (saving 50-70% of the carrier layer), resulting in minimal waste and low cost.

[0026] Preferably, the method for preparing a high-barrier, degradable, and environmentally friendly packaging material includes the following features: The carrier layer and / or the easily peelable backing layer are pre-pressed and ironed against a highly polished (e.g., chrome-plated) high-gloss ironing cylinder (heated or cooled) for a period of time (preferably to a smoothness of ≥1000 seconds); preferably, a belt-pressed ironing mechanism is used to press the carrier layer and / or the easily peelable backing layer against the high-gloss ironing cylinder for a prolonged period of pressurized ironing. This minimizes burrs, spots, and micro-pits on the coating layer deposited on the easily peelable backing layer. Furthermore, after laminating the prefabricated high-resistance layer with the paper layer and removing the carrier layer, the resulting plastic-free ultra-high-resistance material exhibits minimal micropores.

[0027] Preferably, the method for preparing the high-barrier degradable environmentally friendly packaging material is characterized in that it comprises: (a second time) in a vacuum chamber, vapor-depositing a second coating layer on the (first) coating layer of the carrier layer or the (prefabricated high-resistance layer) pore-filling coating (instead of depositing a very thick coating layer at one time); then (taking out the carrier layer from the vacuum chamber and applying the pore-filling coating on the second coating layer in a normal pressure environment); making the easily peelable substrate layer, the (first) coating layer, (optional pore-filling coating), the second coating layer and the pore-filling coating together constitute a temporary coating on the carrier layer (water vapor permeability ≤ 0.01g / m2 / 24h) double (coating) film (layer) prefabricated high resistance layer.

[0028] It should be emphasized that this application innovatively proposes a two-step method of vapor deposition in two steps, rather than a one-step method of depositing a very thick coating layer in one step. The reason for depositing the coating layer in two steps is that the second deposited coating layer can make up for the leaks on the first deposited coating layer; on the contrary, depositing a very thick coating layer in one step (i.e., a one-step method) cannot make up for the leaks. Tests show that the water vapor permeability of the double-film prefabricated high-resistance layer can easily reach ≤0.01g / m 2 / 24h technical level.

[0029] Preferably, the method for preparing the high-barrier degradable environmentally friendly packaging material is characterized in that it comprises: (a third time) vapor-depositing a third coating layer on the second coating layer or its porous coating layer in a vacuum chamber; (then removing the carrier layer from the vacuum chamber and applying the porous coating layer on the third coating layer in a normal pressure environment); (the coating can be repeated multiple times) so that the easily peelable substrate layer and the multiple coating layers and the porous coating layer together form a temporary coating on the carrier layer (the water vapor permeability is ≤0.005g / m 2 / 24h) multi-film (layer) prefabricated high resistance layer. Tests show that the water vapor permeability of the multi-film prefabricated high resistance layer can easily reach ≤0.005g / m 2 / 24h technical level.

[0030] The above-mentioned process method of multiple (multiple) evaporation on the same carrier layer and the multiple prefabricated high-resistance layers obtained are suitable for the production of products with longer shelf life requirements (for example, more than 12 months). For products with moderate shelf life requirements (for example, 6 months), it is a bit wasteful. In order to avoid the formation of micropores as much as possible, the applicant has tested hundreds of expensive formulas for easy-to-peel substrate layers, but none of them could avoid the formation of micropores, and satisfactory results were never achieved. Unexpectedly, the researchers tried an innovative process method of rapid cooling to peel off the carrier layer, which achieved better results.

[0031] Preferably, the method for preparing a high-barrier, biodegradable, and environmentally friendly packaging material comprises the following features: The carrier layer, its prefabricated high-resistance layer, and the paper layer, after exiting a high-temperature oven exceeding 100°C, are immediately wrapped onto a cold roller at 4-12°C for rapid cooling; while still at a low temperature of 4-12°C, the carrier layer is peeled off; the back of the carrier layer is preferably held against the cold roller for 0.5-3 seconds to allow for sufficient cooling; to ensure sufficient cooling, the carrier layer, its prefabricated high-resistance layer, and the paper layer are preferably wrapped onto multiple cold rollers at 4-12°C for multi-stage cooling; the plastic-free high-resistance material, comprising the prefabricated high-resistance layer and the paper layer, is then fed into a coating unit and heated to room temperature; finally, a barrier coating is applied to the easily peelable backing layer to produce the high-barrier, biodegradable, and environmentally friendly packaging material. This method significantly reduces micropores; statistics show that the number of micropores is reduced by at least tenfold. Compared to methods that change the formulation of the easily peelable backing layer, this method is cost-effective and easy to implement. Practice has demonstrated that when the temperature of the prefabricated high-resistance layer and the paper layer is reduced to 4-12°C, the film-forming properties and toughness of the easily peelable backing layer are significantly improved, allowing for easy and complete peeling from the carrier layer, thereby reducing micropores. It is important to emphasize that those skilled in the art generally believe that increasing the temperature decreases the peeling force, facilitating peeling. However, the applicant's research has found that reducing the temperature to 4-12°C significantly improves the film-forming properties and toughness of the easily peelable backing layer, facilitating complete peeling from the carrier layer and significantly reducing micropores.

[0032] Preferably, the method for preparing a high-barrier, biodegradable, and environmentally friendly packaging material is characterized in that the easily peelable substrate layer is a water-soluble laminating layer or coating layer, and the peel force between the water-soluble laminating layer or coating layer and the carrier layer is set to 0.1-0.2N / 25mm. The water-soluble laminating layer or coating layer is preferably a polyethylene oxide film. This prevents the formation of micropores caused by strain, as the polyethylene oxide film is a strong thin film and easily peels cleanly from the carrier layer. Testing has shown that these micropores are virtually nonexistent. In contrast, if the easily peelable substrate layer is a release agent coating, micropores caused by strain are numerous. Therefore, using a polyethylene oxide film layer as the easily peelable substrate layer offers significant technical benefits. The inventors of this application have previously attempted to replace PET or BOPP as a carrier layer with water-soluble films such as polyethylene oxide films. However, they discovered that polyethylene oxide films have low tensile strength, poor thermal stability, and high thermal shrinkage. Therefore, the inventors of this application have attempted to compensate for these performance deficiencies by laminating polyethylene oxide films onto carrier layers such as PET or BOPP, which have high tensile strength, good thermal stability, low thermal shrinkage, and a smooth, clean surface. In other words, experiments have shown that water-soluble films such as polyethylene oxide films cannot directly replace PET or BOPP as the carrier layer, but they can offer superior performance in place of existing release agent coatings.

[0033] Preferably, the method for preparing the high-barrier, biodegradable, and environmentally friendly packaging material is characterized by the coating being a vapor-deposited mixed coating of 73-75% SiO2 and 25-27% Al2O3. Research has shown that this ratio provides the highest barrier properties, ensuring that milk and juice in the packaging lasts for over 12 months, or even three years, without spoiling.

[0034] Preferably, the method for preparing a high-barrier, biodegradable, and environmentally friendly packaging material comprises: applying a Teflon coating or a silicone coating to the surface of the carrier layer to produce a carrier layer with a peel force of 0.1-0.2 N / 25 mm; and applying the barrier coating as a peelable underlayer onto the Teflon or silicone coating. This eliminates the peelable underlayer, saving material costs, and the barrier coating step, while also enhancing the packaging material's base strength.

[0035] Preferably, the method for preparing the high-barrier degradable and environmentally friendly packaging material is characterized in that a prefabricated high-resistance layer is coated on the front or back of the peeled and recycled carrier layer, so that the carrier layer can be recycled and used multiple times.

[0036] To achieve the second of the above objectives, the technical solution of the high-barrier, degradable and environmentally friendly packaging material of the present application is as follows.

[0037] A high-barrier, biodegradable, and environmentally friendly packaging material comprises a paper layer. The material is characterized in that a prefabricated high-resistance layer composed of an easily peelable substrate layer, a coating layer, and a porous coating layer is retained and bonded to the paper layer. Preferably, a barrier coating is also applied to the prefabricated high-resistance layer.

[0038] This ensures that, on the one hand, the coating layer is pre-formed on a moisture-free carrier layer, so it is impervious to moisture during the vapor deposition process. Furthermore, even if moisture is present, the carrier layer cannot penetrate the cured coating layer when laminated with the paper layer. Consequently, this packaging material exhibits high barrier properties and is biodegradable.

[0039] In practice, it is found that after the carrier layer is peeled off, some random micropores (due to scratches or dust punctures) will inevitably appear in the coating layer that is retained and bonded to the paper layer. These micropores will also cause the coating layer to leak air and significantly reduce its barrier performance. Its water vapor permeability is ≥2g / m 2 / 24h. To prevent the formation of micropores, the applicant invested over a million yuan in research and development, conducting repeated experiments using conventional techniques for thickening the coating layer once. These tests revealed that this technique (i.e., a one-step process) cannot completely prevent the formation of micropores. Surprisingly, the researchers tried the following innovative approach, which achieved relatively good results.

[0040] Preferably, the high barrier degradable environmentally friendly packaging material is characterized in that: multiple prefabricated high resistance layers are retained and bonded on the paper layer; wherein the (strained) micropores, sand holes and water vapor perforations on the upper and lower coating layers are staggered with an overlap rate of ≤10 -7 In other words, the plastic-free high-resistance material includes a composite layer of multiple prefabricated high-resistance layers stacked together.

[0041] In this way, a plastic-free ultra-high resistance material is produced. Since the (strained) micropores, sand holes, and water vapor perforations on the upper and lower coating layers will be misaligned, the probability of their complete overlap is almost zero. And they are blocked by another inorganic coating layer, rather than being compensated by the organic barrier coating. Therefore, the barrier performance of the plastic-free ultra-high resistance material will be greatly improved. Comparative experiments show that the barrier performance of the plastic-free ultra-high resistance material is improved several times compared with the plastic-free high-resistance material of the same thickness. For example: milk and juice filled in plastic-free high-resistance material packaging bags of the same thickness have a shelf life of up to 3 months, while milk and juice filled in plastic-free ultra-high resistance material packaging bags of the same thickness have a shelf life of more than 12 months, and even 3 years without deterioration.

[0042] While these plastic-free ultra-high-resistance materials offer improved barrier properties, their production process is complex and energy-intensive. Further research has shown that multiple evaporation deposition techniques on the carrier layer achieve superior barrier and energy savings, while also being relatively simple, efficient, and cost-effective.

[0043] Preferably, the high-barrier, degradable and environmentally friendly packaging material is characterized in that: the prefabricated high-resistance layer includes an easily peelable substrate layer, a first coating layer, a first pore-filling coating layer, a second coating layer, and a second pore-filling coating layer in sequence, thereby constituting a double-film prefabricated high-resistance layer; or, the prefabricated high-resistance layer includes an easily peelable substrate layer, a first coating layer, a second coating layer, and a pore-filling coating layer in sequence, thereby constituting a double-film prefabricated high-resistance layer.

[0044] It should be emphasized that this application innovatively proposes a two-step method of vapor deposition in two steps, rather than a one-step method of depositing a very thick coating layer in one step. The reason for depositing the coating layer in two steps is that the second deposited coating layer can make up for the leaks on the first deposited coating layer; on the contrary, depositing a very thick coating layer in one step (i.e., a one-step method) cannot make up for the leaks. Tests show that the water vapor permeability of the double-film prefabricated high-resistance layer can easily reach ≤0.01g / m 2 / 24h technical level.

[0045] Preferably, the high-barrier, degradable, and environmentally friendly packaging material is characterized in that: the prefabricated high-resistance layer sequentially comprises an easily peelable substrate layer, a first coating layer, a first pore-filling coating layer, a second coating layer, a second pore-filling coating layer, a third coating layer, and a third pore-filling coating layer, thereby forming a multi-film prefabricated high-resistance layer; or the prefabricated high-resistance layer sequentially comprises an easily peelable substrate layer, a first coating layer, a second coating layer, a third coating layer, and a pore-filling coating layer, thereby forming a multi-film prefabricated high-resistance layer. Tests have shown that the air permeability of the multi-film prefabricated high-resistance layer can easily reach ≤0.005g / m 2 / 24h technical level.

[0046] Preferably, the high-barrier, degradable and environmentally friendly packaging material is characterized in that a high-barrier composite glue layer is applied between the porous coating and the paper layer, wherein the paper layer is made of moisture-absorbing and breathable paper (non-breathable and non-hygroscopic paper such as coated paper, glassine paper, and oil-impregnated paper cannot be used); on the one hand, it is used to retain and bond the prefabricated high-resistance layer to the paper layer, and on the other hand, it further improves the barrier properties of the packaging material.

[0047] Preferably, the high-barrier, degradable and environmentally friendly packaging material is characterized in that: the easily peelable substrate layer is a water-soluble laminating layer or a water-soluble coating layer; and the peeling force between the easily peelable substrate layer and the supporting layer is 0.1-0.2N / 25mm.

[0048] Preferably, the high-barrier, degradable and environmentally friendly packaging material is characterized in that: a Teflon coating or a silicone oil coating is coated on the surface of the carrier layer, and its peeling force is 0.1-0.2N / 25mm; the barrier coating also serves as the easy-to-peel backing layer, and is coated on the Teflon coating or the silicone oil coating.

[0049] To achieve the third of the above objectives, the technical solution of the high-barrier, degradable and environmentally friendly packaging of this application is as follows.

[0050] A high-barrier, degradable and environmentally friendly packaging material, characterized in that it is made of any one of the above-mentioned high-barrier, degradable and environmentally friendly packaging materials.

[0051] Preferably, the high-barrier, degradable and environmentally friendly packaging is characterized in that a flat texture string is embedded in the packaging, and the texture information file of the flat texture string is stored in the anti-counterfeiting inspection system database for the public to check the authenticity.

[0052] For the sake of convenience, directional nouns such as front and back are used in this application. In fact, the front and back are relative. If one side is called the front, then the other side must be the back, and vice versa.

[0053] Compared with the existing technology, this application can produce the following beneficial technical effects.

[0054] First, degradable and pollution-free: The high-barrier, degradable and environmentally friendly packaging materials and packaging products described in this application only contain naturally degradable water-based materials such as paper layers, porous coatings, barrier layers, and harmless inorganic substances such as SiO2 coating layers and / or AL2O3 vapor-deposited coatings, and no difficult-to-degrade plastic film layers.

[0055] Second, it possesses ultra-high barrier properties: The barrier properties of the packaging material and its packaging approach those of currently used aluminum foil. Compared to Background Art 2-12, the shelf life of the product contained within can be extended to over one year. With plastic-free ultra-high-resistance materials featuring multiple prefabricated high-resistance layers, the shelf life of the product contained within can even be extended to three years.

[0056] Third, environmental protection and pollution-free: it can be recycled and reused. Even if it is not recycled, it will naturally degrade and break down into harmless inorganic powder, causing no pollution to the environment.

[0057] Fourth, energy saving: Since there is no moisture in the bearing layer, it is easy to reach 10 -3 The vacuum requirement of mpa is reduced, and the energy consumption of the vacuum pump is reduced by more than 68% compared with background technology 2-12. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0059] Figure 1 This is a schematic diagram of the cross-sectional structure of a carrier layer and its prefabricated high-resistance layer in the present application (Example 1).

[0060] Figure 2 This is a schematic diagram of the cross-sectional structure of a plastic-free high-resistance material in this application (Example 2).

[0061] Figure 3 This is a schematic diagram of the cross-sectional structure of a plastic-free ultra-high resistance material in this application (Example 3).

[0062] Figure 4 This is a planar schematic diagram of randomly distributed water vapor perforations on the coating layer in Background Technology 2-12.

[0063] Figure 5 Schematic diagram of the randomly distributed scratched micropores on the coating layer.

[0064] Figure 6 for Figure 2Schematic diagram of the leakage path of the plastic-free high-resistance material.

[0065] Figure 7 for Figure 3 Schematic diagram of the leakage path of the plastic-free ultra-high resistance material.

[0066] Figure 8 This is a schematic diagram of the cross-sectional structure of a carrier layer and a double-film prefabricated high-resistance layer of the present application (Example 4).

[0067] Figure 9 This is a schematic diagram of the cross-sectional structure of another carrier layer and a double-film prefabricated high-resistance layer of the present application (Example 4).

[0068] Figure 10 This is a schematic diagram of the cross-sectional structure of a carrier layer and a multi-film prefabricated high-resistance layer of the present application (Example 5).

[0069] Figure 11 This is a schematic diagram of the cross-sectional structure of another carrier layer and multi-film prefabricated high-resistance layer of the present application (Example 5).

[0070] Figure 12 Schematic diagram of the cross-sectional structure of the currently deposited thickened coating layer.

[0071] Figure 13 This is a schematic diagram of the principle of depositing a coating layer on a carrier layer in the present application (embodiment).

[0072] Figure 14 This is a schematic diagram of the principle of two sets of vacuum coating equipment in this application (embodiment) being arranged in the same vacuum chamber.

[0073] Figure 15 This is a schematic diagram of a belt circulation delayed pressurized drying mechanism consisting of a pressure belt and multiple pulleys in the present application (Example 6).

[0074] Figure 16 This is a schematic diagram of a belt circulation delayed pressure ironing mechanism composed of a pressure belt and multiple pulleys in the present application (Example 7).

[0075] Explanation of the accompanying numbers: 1-paper layer, 2-composite glue layer, 3-prefabricated high-resistance layer, 301-porous coating, 302-coating layer, 312-second coating layer, 322-third coating layer, 303-easy-to-peel backing layer, 4-bearing layer, 5-barrier coating, 6-heat-seal coating, 7-water vapor perforation, 8-micropores, 9-leakage path, 10-thickened coating layer, 11-evaporation source, 12-coating drum, 13-vacuum chamber, 14-winding, 15-unwinding, 16-high-gloss drying cylinder, 17-pressure belt, 18-pulley, 19-high-gloss ironing cylinder. DETAILED DESCRIPTION

[0076] Example 1.

[0077] like Figure 1 、 Figure 13 As shown, Figure 1 It is a schematic diagram of the cross-sectional structure of a bearing layer and its prefabricated high-resistance layer.

[0078] A 25 μm PET film is used as the carrier layer 4. A 6-12 μm thick polyethylene oxide film is first laminated on the front of the carrier layer 4 (the peeling force is preferably 0.1-0.2 N / 25 mm) as the easy-to-peel backing layer 303 using a laminating machine. The carrier layer 4 with the easy-to-peel backing layer 303 attached in the previous step is then placed into the vacuum chamber 13 (i.e., the first time) at a vacuum degree of ≥6×10 - 3 In a vacuum environment of mpa, an oxide coating layer 302 such as a SiO2 coating layer and / or an AL2O3 coating layer is vapor-deposited on the easily strippable substrate layer 303; it is taken out of the vacuum chamber 13, and a pore-filling coating layer 301 such as an acrylic emulsion is coated on the coating layer 302 on a coating machine in a common environment to seal the micropores 8 such as sand holes on the coating layer 302; the multiple layers such as the easily strippable substrate layer 303, the coating layer 302, and the pore-filling coating layer 301 together constitute a prefabricated high-resistance (barrier) layer 3, which is temporarily covered on the carrier layer 4 for use in subsequent stripping steps.

[0079] In the above steps, the reason for laying the pore-filling coating 301 is that during the vapor deposition process, the coating layer 302 will still form some sand holes caused by many unexpected factors such as dust. In order to fill the sand holes and improve the barrier performance, the technical measure of laying the pore-filling coating 301 is adopted here.

[0080] In the above steps, the polyethylene oxide film layer serving as the easily peelable substrate layer 303 has strong film-forming and degradable properties, almost like a thin film, making it easy to completely peel from the carrier layer 4. This also reduces the risk of strained micropores 8. Tests have shown that strained micropores 8 are virtually nonexistent. Thus, using a polyethylene oxide film layer as the easily peelable substrate layer 303 has significant beneficial technical effects.

[0081] In the above steps, the easily peelable substrate layer 303 may also be formed using a low-viscosity coating, for example, a formulation comprising 1015 parts mica powder, 58 parts silicon dioxide, 1522 parts borax, 38 parts talc, 1218 parts graphite emulsion, 1116 parts emulsifier, 25 parts defoamer, 2025 parts silicone resin, 1624 parts polyurethane adhesive, and 712 parts hydrophilic chain extender. This low-viscosity coating also exhibits good peelability and can be used to coat the easily peelable substrate layer 303. Of course, those skilled in the art may also select various suitable low-viscosity water-based coatings, with a peel force requirement of 0.1-0.2 N / 25 mm.

[0082] It is desirable to use a mixture of 73-75% SiO2 and 25-27% Al2O3 as the evaporation source 11. Research has shown that the coating layer 302 formed with this formulation has the highest barrier properties. Packaging bags made with this formulation, when filled with milk and juice, have a shelf life of over 12 months, or even three years, without deterioration. Conversely, formulations with SiO2 below 72% or above 75%, and Al2O3 below 25% or above 27%, do not produce coating layers 302 with high barrier properties. In other words, the formulation window for the highest barrier properties is very narrow: 75%-72% = 3% for SiO2 and 27%-25% = 2% for Al2O3. This narrow formulation window, discovered by the inventors of the present invention, was a difficult feat and has significant technical benefits.

[0083] Example 2.

[0084] like Figure 2 As shown, Figure 2 Schematic diagram of the cross-sectional structure of a plastic-free high-resistance material.

[0085] Choose a 76g / m 2 Non-fluorescent white backing paper is used as the paper layer 1, and an acrylic emulsion is selected as the composite glue layer 2. The prefabricated high-resistance layer 3 on the carrier layer 4 is laminated to the front of the paper layer 1 using a wet lamination process and dried at temperatures exceeding 100°C. The material is then coated onto multiple cold rollers at 4-12°C for rapid cooling. At the low temperature of 4-12°C, the carrier layer 4 is peeled off and recovered, with the back of the carrier layer 4 pressed against the cold rollers for 0.5-3 seconds to allow sufficient cooling time. The plastic-free high-resistance material, consisting of the prefabricated high-resistance layer 3 and the paper layer 1, is then fed into a coating unit and heated to room temperature. Finally, a layer of acrylic emulsion is applied as a barrier coating 5 onto the easily peelable substrate layer 303 exposed after the carrier layer 4 is peeled off, resulting in a plastic-free high-resistance material. This plastic-free high-resistance material can replace existing aluminum foil backing paper, such as that found in cigarette boxes.

[0086] In this way, the number of micropores 8 damaged by strain will be greatly reduced. Statistics show that the number of micropores 8 damaged by strain is reduced by at least ten times. Compared with the traditional method of changing the formula of the easy-to-peel substrate layer 303, the cost is low and easy to implement. Practice has proved that when the temperature of the prefabricated high-resistance layer 3 and the paper layer 1 is reduced to 4-12°C, the film-forming property and toughness of the easy-to-peel substrate layer 303 are greatly improved, and it is easy to completely peel off from the carrier layer 4, thereby reducing the micropores 8 damaged by strain. It should be emphasized here that: general technicians in this field believe that when the temperature is increased, the peeling force will decrease and it will be easy to peel off. The applicant's research found that when the temperature is reduced to 4-12°C, the film-forming property and toughness of the easy-to-peel substrate layer 303 will be greatly improved, and it will be easy to completely peel off from the carrier layer 4, and the micropores 8 damaged by strain will be greatly reduced.

[0087] Example 3.

[0088] It is desirable that Figure 3 As shown, on the plastic-free high-resistance material prepared in the previous example, 1-2 layers of prefabricated high-resistance layer 3 are compounded, dried, retained, and bonded to form a plastic-free ultra-high-resistance material.

[0089] In this way, the micropores 8, pinholes, and water vapor perforations 7 on the upper and lower coating layers 4 are inevitably misaligned, and the probability of their complete overlap is almost zero. Furthermore, they are completely blocked by the other inorganic coating layer 302, rather than simply compensated by the barrier coating 5. The leakage path 9 between the two nearest leak holes in the upper and lower layers is necessarily very long, so its barrier performance will be greatly improved. In other words, the process method of this embodiment can be used to produce a plastic-free ultra-high resistance material. Tests show that its air permeability can easily reach ≤0.01g / m 2 / 24h technical level.

[0090] Figure 6 for Figure 2 Schematic diagram of the leakage path of the plastic-free high-resistance material. Figure 7 for Figure 3 Schematic diagram of the leakage path of the plastic-free ultra-high resistance material. Comparing the two figures, it can be seen that the leakage path 9 with multiple prefabricated high-resistance layers 3 is the longest. Figure 7 The leakage path 9 in the Figure 6 The leakage path 9 in the air is extended hundreds or thousands of times, which is why it is the most difficult to leak. In other words, the plastic-free high-resistance material with multiple prefabricated high-resistance layers 3 has ultra-high barrier properties.

[0091] The back side of the paper layer 1 on the plastic-free high-resistance material produced by the above process is coated with a heat-sealing coating 6, and the packaging bag for milk and juice can be made from the paper layer 1.

[0092] Comparative experiments show that the barrier performance of plastic-free ultra-high resistance materials is improved several times compared with plastic-free high-resistance materials of the same thickness. For example, the shelf life of milk and juice filled in plastic-free high-resistance material packaging bags of the same thickness is up to 3 months, while the shelf life of milk and juice filled in plastic-free ultra-high resistance material packaging bags of the same thickness is more than 12 months, and even 3 years will not deteriorate.

[0093] Example 4.

[0094] like Figure 8 、 Figure 13 As shown, the prefabricated high-resistance layer 3 (in the above-mentioned embodiment 1) is firstly sent into the vacuum chamber 13 together with its supporting layer 4 again (i.e., for the second time), and a second coating layer 312 is vapor-deposited on the pore-filling coating layer 301 (instead of depositing and thickening it once); then it is taken out of the vacuum chamber 13, and the pore-filling coating layer 301 is coated on the second coating layer 312 and dried; so that the easily peelable substrate layer 303, the (first) coating layer 302, the pore-filling coating layer 301, the second coating layer 312 and the pore-filling coating layer 301, etc., together constitute a temporary coating (air permeability ≤ 0.01 g / m 2 / 24h) double (coating) film (layer) prefabricated high resistance layer 3. It should be emphasized that here the vapor deposition is carried out in multiple times, rather than a single deposition thickening. The reason for multiple depositions is that the second deposited coating layer 312 can make up for the leaks on the first deposited coating layer 302; on the contrary, the thickened coating layer 10 deposited in a single time cannot make up for the leaks formed by itself. Tests show that the air permeability of the double-film prefabricated high resistance layer 3 can easily reach ≤0.01g / m 2 / 24h technical level.

[0095] like Figure 9 、 Figure 14 As shown, a coating drum 12 is connected in series in the same vacuum chamber 13. In other words, two sets of vacuum coating equipment are placed in one vacuum chamber 13. A second coating layer 312 is further vapor-deposited on the (first) coating layer 302 in the above-mentioned embodiment 1 (instead of depositing and thickening it once). After being taken out of the vacuum chamber 13, a pore-filling coating 301 is applied on the second coating layer 312. The multiple layers including the easily peelable substrate layer 303, the (first) coating layer 302, the second coating layer 312 and the pore-filling coating 301 together constitute a temporary coating (air permeability ≤ 0.01 g / m 2 / 24h) double (coating) film (layer) prefabricated high resistance layer 3. It should be emphasized that the vapor deposition is carried out in two steps, rather than a single deposition and thickening. The reason for the two depositions is that the second deposited coating layer 312 can make up for the leaks on the first deposited coating layer 302; on the contrary, the thickened coating layer 10 deposited in one step cannot make up for the leaks formed by itself. Tests show that the air permeability of the double-film prefabricated high resistance layer 3 can easily reach ≤0.005g / m 2 / 24h technical level.

[0096] Research shows that Figure 8 The technical solution shown is Figure 9 Compared to the technical solution shown, the air permeability of the two differs by an order of magnitude. The former has lower air permeability, stronger barrier properties, better flexibility, and higher quality. This is because a filler coating 301 is sandwiched between the (first) coating layer 302 and the second coating layer 312. This filler coating 301 further fills the micropores 8 in the prefabricated high-resistance layer 3. Because the micropores 8, pinholes, and water vapor perforations in the upper and lower coating layers are misaligned, the probability of their complete overlap is almost zero. As a result, the leakage path between the two nearest leaks in the upper and lower layers is necessarily very long, which greatly improves the barrier performance.

[0097] Example 5.

[0098] like Figure 10 As shown, the double-film prefabricated high-resistance layer 3 prepared in the fourth embodiment, together with its carrier layer 4, is again (i.e., for the third time) sent into the vacuum chamber 13, and a third coating layer 322 is vapor-deposited on the porous coating layer 301; taken out of the vacuum chamber 13, and a porous coating layer 310 is coated on the third coating layer 322; (the film can be repeatedly placed in and out of the vacuum chamber for multiple times) so that the easily peelable substrate layer 303, the multiple coating layers, and the porous coating layer 301 together form a temporary coating (air permeability ≤ 0.005 g / m 2 / 24h) multi-film (layer) prefabricated high resistance layer 3. Tests show that the air permeability of the multi-film prefabricated high resistance layer 3 can easily reach ≤0.005g / m 2 / 24h technical level.

[0099] like Figure 11 As shown, further on the second coating layer 312 in the fourth embodiment, a third coating layer 322 is vapor-deposited (instead of being deposited and thickened at one time); after being taken out of the vacuum chamber, a pore-filling coating 301 is applied on the third coating layer 322; the easily peelable substrate layer 303, the (first) coating layer 302, the second coating layer 312, the third coating layer 322 and the pore-filling coating 301 are multi-layered to form a temporary coating on the carrier layer 4 (air permeability ≤ 0.01 g / m 2 / 24h) multi-film (layer) prefabricated high-resistance layer 3. It should be emphasized that the vapor deposition is carried out three times here, rather than one deposition and thickening. The reason for three depositions is that the second deposition of the coating layer 312 and the third deposition of the coating layer 322 can make up for the leakage holes on the first deposition of the coating layer 302 and the second deposition of the coating layer 312; on the contrary, the thickened coating layer 10 deposited once cannot make up for the leakage holes formed by itself. Tests show that the air permeability of the multi-film prefabricated high-resistance layer 3 can easily reach ≤0.005g / m 2 / 24h technical level.

[0100] In summary (Examples 4 and 5), the multi-film (including double-film) prefabricated high-resistance layer 3 prepared by multiple multi-layer coating thickening technical measures has a significantly reduced water vapor permeability and significantly improved barrier performance compared to the thickened coating layer 10 prepared by a single single-layer thickening technical measure.

[0101] Example 6.

[0102] like Figure 15 As shown, an innovative seamless belt (circulating) pressure mechanism is constructed, comprising a (e.g., seamless, circulating) pressure belt 17 and multiple pulleys 18. The surface of the paper layer 1 is pre-coated, and the seamless belt pressure mechanism presses the coated surface tightly against a highly polished (e.g., chrome-plated) high-gloss drying cylinder 16 for delayed pressurized drying, resulting in a smooth, even paper surface. Experimental testing has shown that compared to instantaneous pressurized and non-pressurized drying processes, this delayed pressurized drying significantly improves paper surface smoothness, achieving a smoothness of over 1000 seconds, compared to only 600-800 seconds otherwise.

[0103] In this way, the surface of the paper layer 1 has very few burrs, spots, and micro-pits. Therefore, after the prefabricated high-resistance layer 3 is compounded with the paper layer 1 and the carrier layer 4 is removed, the micropores 8 on the resulting plastic-free ultra-high-resistance material will be very few. Tests have shown that the water vapor permeability of the resulting plastic-free ultra-high-resistance material can easily reach ≤0.005g / m 2 / 24h extremely high technical level.

[0104] Example 7.

[0105] like Figure 16As shown, the carrier layer 4 and / or the easily peelable backing layer 303 are placed in close contact with a highly polished (e.g., chrome-plated) high-gloss ironing cylinder 19 (heated or cooled) and pressed and ironed (preferably to a smoothness of ≥1000s). Preferably, the belt-pressing and ironing mechanism is used to press the easily peelable backing layer 303 against the high-gloss ironing cylinder 19 for extended pressurization and ironing to further improve the smoothness of the carrier layer 4 and / or the easily peelable backing layer 303. This minimizes burrs, spots, and micro-pits on the coating layer 302 deposited on the easily peelable backing layer 303. After laminating the prefabricated high-resistance layer 3 with the paper layer 1 and removing the carrier layer 4, the resulting plastic-free ultra-high-resistance material will have minimal micropores, thereby ensuring that the resulting plastic-free ultra-high-resistance material exhibits extremely high barrier properties.

[0106] The technical solution provided by the present application is described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only intended to help understand the method and core ideas of the present application. It should be noted that, for those skilled in the art, without departing from the principles of the present application, several improvements and modifications may be made to the present application, and these improvements and modifications also fall within the scope of protection of the present application.

Claims

1. A method for preparing a high-barrier, degradable, and environmentally friendly packaging material, comprising: laying a coating layer on a paper layer; characterized in that: It includes the following process steps: S1. A film with high tensile strength and a smooth surface is used as a carrier layer; an easily peelable substrate layer is first applied to the back of the carrier layer; a coating layer is then vapor-deposited on the easily peelable substrate layer in a vacuum chamber; and a pore-filling coating is then applied to the coating layer; The easily strippable substrate layer, the coating layer and the porous coating together form a prefabricated high-resistance layer temporarily covering the carrier layer, so as to be stripped and used in subsequent processes; S2. Compounding the prefabricated high-resistance layer with the paper layer and drying them to form a composite structure in which the supporting layer, the prefabricated high-resistance layer, and the paper layer are arranged in sequence; then immediately wrapping the supporting layer, the prefabricated high-resistance layer, and the paper layer, which have been removed from a high-temperature oven at a temperature exceeding 100° C., onto a cold roller at a temperature of 4-12° C. for rapid cooling; At a low temperature of 4-12° C., the carrier layer is peeled off and recovered; the prefabricated high-resistance layer is peeled off, retained and bonded to the paper layer, and together with the paper layer, forms a plastic-free high-resistance material; The plastic-free high-resistance material is further compounded with the prefabricated high-resistance layer on the carrier layer and dried; the carrier layer is then peeled off and recovered; the newly added prefabricated high-resistance layer is peeled off, retained and bonded to the prefabricated high-resistance layer already on the plastic-free high-resistance material to form a plastic-free ultra-high-resistance material having multiple prefabricated high-resistance layers; The easily peelable substrate layer is a water-soluble laminating layer or a water-soluble coating layer.

2. The method for preparing a high-barrier, degradable, and environmentally friendly packaging material according to claim 1, wherein: Also includes: In a vacuum chamber, vapor-depositing a second coating layer on the coating layer of the carrier layer or on the porous coating layer; Then, coating the pore-filling coating on the second coating layer; The easily strippable substrate layer, the coating layer, the second coating layer and the porous coating layer together constitute a double-film prefabricated high-resistance layer temporarily covering the bearing layer.

3. The method for preparing a high-barrier, degradable, and environmentally friendly packaging material according to claim 2, wherein: Also includes: In a vacuum chamber, vapor-depositing a third coating layer on the second coating layer or the pore-filling coating; and coating the pore-filling coating on the third coating layer; The easily strippable substrate layer, the multiple coating layers and the porous coating layer together form a multi-film prefabricated high-resistance layer temporarily covering the bearing layer.

4. The method for preparing a high-barrier, degradable, and environmentally friendly packaging material according to claim 1, 2, or 3, wherein: Also includes: A high-barrier composite glue layer is applied between the porous coating layer and the paper layer to peel off the prefabricated high-resistance layer, retain it, and bond it to the paper layer.

5. The method for preparing a high-barrier, degradable, and environmentally friendly packaging material according to claim 1, 2, or 3, wherein: The easily peelable substrate layer is a water-soluble laminating layer or a water-soluble coating layer; the peeling force between the easily peelable substrate layer and the bearing layer is set to 0.1-0.2N / 25mm.

6. The method for preparing a high-barrier, degradable, and environmentally friendly packaging material according to claim 1, 2, or 3, wherein: The coating layer is a mixed coating layer of 73-75% SiO2 and 25-27% Al2O3 deposited by vapor phase.

7. The method for preparing a high-barrier, degradable, and environmentally friendly packaging material according to claim 1, 2, or 3, wherein: Applying a Teflon coating or a silicone oil coating on the surface of the carrier layer to prepare the carrier layer with a peeling force of 0.1-0.2N / 25mm; The barrier coating also serves as the easily peelable substrate layer and is coated on the Teflon coating or the silicone oil coating.

8. A high-barrier, degradable, and environmentally friendly packaging material, prepared by the method for preparing a high-barrier, degradable, and environmentally friendly packaging material according to any one of claims 1 to 7, comprising a composite layer of a paper layer and a plurality of prefabricated high-resistance layers; characterized in that: On the paper layer, a plurality of prefabricated high-resistance layers composed of an easily peelable substrate layer, a coating layer and a porous coating layer are retained and bonded.

9. The high-barrier, degradable, and environmentally friendly packaging material according to claim 8, characterized in that: The prefabricated high-resistance layer includes an easily strippable substrate layer, a first coating layer, a first pore-filling coating layer, a second coating layer, and a second pore-filling coating layer in sequence, thereby forming a double-film prefabricated high-resistance layer; or, the prefabricated high-resistance layer includes an easily strippable substrate layer, a first coating layer, a second coating layer, and a pore-filling coating layer in sequence, thereby forming a double-film prefabricated high-resistance layer.

10. The high-barrier, degradable, and environmentally friendly packaging material according to claim 9, characterized in that: The prefabricated high-resistance layer includes an easily strippable substrate layer, a first coating layer, a first pore-filling coating layer, a second coating layer, a second pore-filling coating layer, a third coating layer, and a third pore-filling coating layer in sequence, thereby constituting a multi-film prefabricated high-resistance layer; or, the prefabricated high-resistance layer includes an easily strippable substrate layer, a first coating layer, a second coating layer, a third coating layer, and a pore-filling coating layer in sequence, thereby constituting a multi-film prefabricated high-resistance layer.

11. The high-barrier, degradable, and environmentally friendly packaging material according to claim 8, 9, or 10, characterized in that: A high-barrier composite glue layer is coated between the porous coating layer and the paper layer.

12. The high-barrier, degradable, and environmentally friendly packaging material according to claim 8, 9, or 10, characterized in that: The easily peelable substrate layer is a water-soluble laminating layer or a water-soluble coating layer; the peeling force between the easily peelable substrate layer and the bearing layer is 0.1-0.2N / 25mm.

13. The high-barrier, degradable, and environmentally friendly packaging material according to claim 8, 9, or 10, characterized in that: The surface of the bearing layer is coated with a Teflon coating or a silicone oil coating, and its peeling force is 0.1-0.2N / 25mm; the barrier coating also serves as the easy-to-peel backing layer, and is coated on the Teflon coating or the silicone oil coating.

14. A high-barrier, degradable and environmentally friendly packaging material, characterized by: The packaging material is made of any one of the high-barrier, degradable and environmentally friendly packaging materials described in claims 8 to 13.

15. The high-barrier, degradable and environmentally friendly packaging according to claim 14, characterized in that: A flat texture string is embedded in the packaging, and the texture information file of the flat texture string is stored in the anti-counterfeiting inspection system database for the public to check the authenticity.

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