Degradable high-barrier double-sided direct plating paper

Abstract

The utility model relates to degradable high-barrier double-sided direct plating paper, and belongs to the technical field of packaging materials. Degradable high-barrier double-sided direct plating paper comprises a body paper layer, and is characterized in that a barrier layer I, an evaporation layer and a protective layer are sequentially coated upwards along the upper surface of the body paper layer, and a barrier layer I, an aluminum plating layer, a barrier layer I and a heat sealing layer are sequentially coated downwards along the lower surface of the body paper layer. According to the utility model, a plurality of coatings are matched with one another to fill the paper exhaust holes and seal the paper fibers, so that the paper is subjected to complete coating sealing, the barrier property to gas molecules such as water vapor and oxygen is improved on the whole, and the packaging requirements of different contents and different weights are met. The environment-friendly degradable decorative material has the dual effects of environmental protection, degradability and exquisite printing appearance, meets the two requirements of anti-counterfeiting and attractiveness, and meets the requirements of the novel high-end packaging industry and the decorative material market.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging materials for cigarettes, wines, cosmetics, gifts, etc., and particularly relates to a degradable high-barrier double-sided directly coated paper. Background Art

[0002] Compared with plastic packaging, paper has better stability, printing adaptability and ease of post-processing. However, since a large number of hydroxyl groups are exposed on the surface of paper fibers, paper has high hydrophilicity and hygroscopicity and poor barrier performance. Therefore, the research and development of paper-based materials with good environmental protection and barrier performance has become a current research hotspot.

[0003] Currently, the mainstream products that can improve the environmental protection and barrier properties of paper-based materials mainly include: traditional aluminum foil barrier paper, transfer barrier paper and single-sided directly coated barrier paper; among them, traditional aluminum foil barrier paper contains non-degradable materials, has poor environmental protection, high production costs and complex processes; transfer barrier paper requires the use of a film during the production process, which not only increases the production cost, but also the film is non-degradable, causing environmental pollution; the barrier index of single-sided directly coated barrier paper is relatively low and cannot meet the barrier requirements of foods and drugs with relatively high requirements. Summary of the Invention

[0004] The utility model aims to solve the above-mentioned various problems, and further provides a degradable high-barrier double-sided directly coated paper, which can simultaneously have the dual effects of environmental protection and barrier, meet the two major requirements of anti-counterfeiting and beauty, and meet the needs of the new high-end packaging industry and the decorative material market.

[0005] The specific technical solution of the utility model is as follows:

[0006] A degradable high-barrier double-sided directly coated paper, including a base paper layer 5, characterized in that a first barrier layer 4, an evaporation coating layer 6 and a protective layer 7 are sequentially coated upward along the upper surface of the base paper layer 5, and a first barrier layer 4, an aluminized layer 3, a second barrier layer 2 and a heat-sealing layer 1 are sequentially coated downward along the lower surface of the base paper layer 5.

[0007] Preferably, the heat-sealing layer 1 is an ethylene acrylate coating or an ethylene vinyl acetate coating or an ethylene maleic anhydride copolymer coating.

[0008] Preferably, the second barrier layer 2 is a coating that closes the pores of the paper, has a certain water-blocking property and can be heat-sealed, and the water vapor transmission rate of the coating < 1g / m 2 / 24h.

[0009] Furthermore, the second barrier layer 2 is a coating prepared by mixing fatty acid modified polyester hexaacrylate, modified polyester acrylate, β-carboxyethyl acrylate oligomer and 1,6-hexanediol diacrylate in different proportions.

[0010] Preferably, the aluminized layer 3 is a metallic aluminum layer with a nano - thickness level vacuum - evaporated onto the upper surface of the second barrier layer 2.

[0011] Preferably, the first barrier layer 4 is coated on both sides of the base paper layer 5 and is a coating that can seal the pores of the paper and block oxygen. The oxygen transmission rate of the coating is < 1 cm 3 / m 2 / 24 h at 25 °C.

[0012] Furthermore, the first barrier layer 4 is a coating prepared by mixing methacrylate, polyester acrylate, 3 - methyl - 1,5 - pentanediol diacrylate, and 1,4 - butanediol diacrylate in a predetermined ratio.

[0013] Preferably, the base paper layer 5 is a paper - based material with a basis weight ranging from 30 to 340 g / m².

[0014] Preferably, the vapor - deposited layer 6 is a metal or oxide vapor - deposited layer obtained by vacuum vapor deposition, with a thickness of 20 - 30 nm.

[0015] Preferably, the protective layer 7 is a polyacrylate - based varnish with a coating viscosity of 18 - 20 s and a coating thickness of 1 μm. The coating of the protective layer 7 has good leveling properties, a relatively low surface tension, and can ensure that the printed pattern on the plate is the same size as the plate itself without deformation during printing. The function of the protective layer 7 is to protect the vapor - deposited layer from being damaged and to endow the coating with good printing properties.

[0016] The utility model has the following technical effects:

[0017] 1. The barrier performance of the product of the utility model can reach the level of aluminum - plastic composite materials, and can effectively block the oxidation of water vapor, oxygen, light, microorganisms, etc. to the product, and extend the shelf life of the product.

[0018] 2. The product of the utility model can be printed with more delicate patterns in the later stage, while ordinary barrier papers are only limited to simple printing and halftone printing.

[0019] 3. The product of the utility model is safe, environmentally friendly, food - contactable, has good biodegradability, and the degradation rate is as high as 93%. Compared with plastics, it has better environmental protection, can realize the packaging method of replacing plastic with paper, and reduce the use of plastics and environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the interlayer structure of the degradable high - barrier double - sided directly - coated paper in Example 1;

[0021] In the figure, 1, heat - seal layer; 2, second barrier layer; 3, aluminized layer; 4, first barrier layer; 5, base paper layer; 6, vapor - deposited layer; 7, protective layer. Detailed implementation mode

[0022] The following will make the following detailed description of the present utility model with reference to the accompanying drawings.

[0023] This embodiment provides an interlayer structure of a degradable high-barrier double-sided directly plated paper, and its technical core is: adopting a composite layer structure of a barrier layer 1 on both sides of the base paper, an aluminized layer 3 and a barrier layer 2, so that the product has both environmental protection and barrier effects at the same time, meets the two major requirements of anti-counterfeiting and aesthetics, and meets the needs of the new high-end packaging industry and the decorative material market. The barrier layer 2 provides a coating with certain water resistance and heat-sealability. The aluminized layer 3 is a metal aluminum layer with a predetermined thickness vacuum-evaporated on the upper surface of the barrier layer 2. The main function of the barrier layer 1 is to provide a coating that can seal the pores of the paper and block oxygen. Finally, through the combination of three key coatings and the cooperation of the effects of other coatings, the barrier performance is improved to meet the packaging performance requirements of different contents and different weights.

[0024] The following will describe the technical solutions of the present utility model in detail with reference to the accompanying drawings and embodiments:

[0025] Embodiment 1

[0026] This Embodiment 1 discloses a degradable high-barrier double-sided directly plated paper, which includes a heat-sealing layer 1, a barrier layer 2, an aluminized layer 3, a barrier layer 1, a base paper layer 5, a barrier layer 1, an evaporation layer 6, and a protective layer 7; the above coatings are sequentially compounded and arranged from bottom to top.

[0027] The heat-sealing layer 1 is an ethylene acrylate coating. The coating of the barrier layer 2 is prepared from the following raw materials in parts by weight: 30 parts of fatty acid-modified polyester hexaacrylate (RYOJI), 20 parts of modified polyester acrylate (BASF Laromer PO94F), 30 parts of β-carboxyethyl acrylate oligomer (Solvay SOLVAY SIPOMER β-CEA), and 20 parts of 1,6-hexanediol diacrylate (Covestro).

[0028] The coating structure and formula of the barrier layer 1 are the same, and it is composed of 30 parts of methacrylate, 40 parts of polyester acrylate, 25 parts of 3-methyl-1,5-pentanediol diacrylate, and 5 parts of 1,4-butanediol diacrylate. The base paper layer 5 selects a paper base with a basis weight of 225 g / ㎡. The evaporation layer 6 is an aluminum layer, and its main function is to form a strong metallic texture visually to meet the appearance requirements. The protective layer 7 is a polyacrylate-based varnish, the coating viscosity is 20 s, and the coating thickness is 1 μm.

[0029] The degradable high-barrier double-sided directly plated paper in this Embodiment 1 is prepared by the following method:

[0030] S1. Double-sided Coating I: Double-sided curtain coating is carried out on both sides of the paper simultaneously. The coating is an oxygen barrier layer coating composed of hyperbranched polyester acrylate, urethane acrylate, silicone resin leveling agent, and defoaming agent, which is dried and cured into a film to obtain the barrier layer 1 on the upper and lower sides of the paper respectively.

[0031] S2. Aluminum Coating I: A layer of aluminum metal is evenly vapor-deposited on the barrier layer 1 above the paper through a vacuum coating device. The vapor-deposition speed is 10 m / s, the initial vacuum degree of the coating chamber is ≤ 4E-4 mbar, the winding chamber is ≤ 4E-2 mbar, and the thickness is 25 nm to obtain the aluminum coating layer 3.

[0032] S3. Aluminum Coating II: A layer of aluminum metal is evenly vapor-deposited on the barrier layer 1 below the paper through a vacuum coating device. The vapor-deposition speed is 10 m / s, the initial vacuum degree of the coating chamber is ≤ 4E-4 mbar, the winding chamber is ≤ 4E-2 mbar, and the thickness is 25 nm to obtain the vapor-deposited layer 6.

[0033] S4. Coating: A water barrier coating composed of fatty acid-modified polyester hexaacrylate, modified polyester acrylate, β-carboxyethyl acrylate oligomer, and 1,6-hexanediol diacrylate is coated on the aluminum coating layer 3 to obtain the barrier layer 2. The coating thickness is 1.1 μm. When radiation curing, the electron beam radiation curing power is controlled at 4.0 KGY.

[0034] S5. Double-sided Coating II: Double-sided coating is carried out simultaneously on the front and back sides of the composite layer structure obtained in S4. A varnish suitable for printing is coated on the vapor-deposited layer on the front side to obtain the protective layer 7. A suitable heat-sealing layer coating is coated on the barrier layer 1 on the back side to obtain the heat-sealing layer 1. The coating speed is 500 m / min, the coating viscosity is 10 s, and the oven drying efficiency is 100 - 120.

[0035] Through the above steps, a degradable high-barrier double-sided directly coated paper with a layer structure of heat-sealing layer 1, barrier layer 2, aluminum coating layer 3, barrier layer 4, base paper layer 5, barrier layer 4, vapor-deposited layer 6, and protective layer 7 from bottom to top can be obtained.

[0036] Example II

[0037] This Example II discloses a degradable high-barrier double-sided directly coated paper, with a heat-sealing layer 1, barrier layer 2, aluminum coating layer 3, barrier layer 4, base paper layer 5, barrier layer 4, vapor-deposited layer 6, and protective layer 7 arranged in a composite manner from bottom to top.

[0038] The heat-sealing layer 1 is ethylene vinyl acetate. The coating formulation of the barrier layer 2 is prepared from the following raw materials in parts by weight: 25 parts of fatty acid-modified polyester hexaacrylate (Zhanxin EBECRYL®450), 25 parts of modified polyester acrylate (Korea Aekyung aa6681), 35 parts of β-carboxyethyl acrylate oligomer (Rhodia β-CEA), and 15 parts of 1,6-hexanediol diacrylate (Korea KPX); the aluminized layer 3 is an aluminum layer obtained by vacuum evaporation, with a thickness of 20 μm. The coating structures and coating formulations of the barrier layer 1 4 and the barrier layer 1 4 are the same, and are composed of 28 parts of methacrylate, 32 parts of polyester acrylate, 30 parts of 3-methyl-1,5-pentanediol diacrylate, and 10 parts of 1,4-butanediol diacrylate. The base paper layer 1 selects a paper base with a basis weight of 60 g / m². The vapor deposition layer 6 is an aluminum layer, and its main function is to form a strong metallic texture visually to meet the appearance requirements. The protective layer 7 is a polyacrylate-based varnish, with a coating viscosity of 20 s and a coating thickness of 1 μm.

[0039] The degradable high-barrier double-sided directly aluminized paper in the second embodiment can be prepared by the following method:

[0040] S1. Double-sided coating I: Simultaneously perform double-sided curtain coating on both sides of the paper, and uniformly coat the oxygen barrier coating composed of methacrylate, polyester acrylate, 3-methyl-1,5-pentanediol diacrylate, and 1,4-butanediol diacrylate, and dry and cure to form a film to obtain the barrier layer 1 4 on both sides of the paper.

[0041] S2. Aluminizing I: Uniformly evaporate a layer of metallic aluminum on the barrier layer 1 4 through a vacuum coating device, with an evaporation speed of 10 m / s, an initial vacuum degree of the coating chamber ≤ 4E-4 mbar, and the winding chamber ≤ 4E-2 mbar, and a thickness of 25 nm to obtain the aluminized layer 3.

[0042] S3. Aluminizing II: Uniformly evaporate a layer of metallic aluminum on the barrier layer 1 4 through a vacuum coating device, with an evaporation speed of 10 m / s, an initial vacuum degree of the coating chamber ≤ 4E-4 mbar, and the winding chamber ≤ 4E-2 mbar, and a thickness of 20 nm to obtain the vapor deposition layer 6.

[0043] S4. Coating: Coat the water barrier coating composed of fatty acid-modified polyester hexaacrylate, modified polyester acrylate, β-carboxyethyl acrylate oligomer, and 1,6-hexanediol diacrylate on the aluminized layer 3 to obtain the barrier layer 2. When radiation curing, the electron beam radiation curing power is controlled at 2.0 KGY.

[0044] S5. Double-sided coating II: The front and back sides of the composite layer structure obtained in S4 are coated simultaneously by double-sided coating. A varnish suitable for printing is coated on the front vapor deposition layer to obtain the protective layer 7. A suitable heat-sealing layer coating is coated on the back barrier layer I to obtain the heat-sealing layer 1. The coating speed is 550 m / min, the coating viscosity is 20 s, and the oven drying efficiency is 100 - 120.

[0045] Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention. Any modifications, equivalent replacements, or improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention. Those not detailed in this technical solution are all well-known technologies.

Claims

1. A degradable high-barrier double-sided directly coated paper, comprising a base paper layer (5), characterized in that, A barrier layer one (4), an evaporation coating layer (6), and a protective layer (7) are sequentially coated upward along the upper surface of the base paper layer (5), and a barrier layer one (4), an aluminized layer (3), a barrier layer two (2), and a heat-sealing layer (1) are sequentially coated downward along the lower surface of the base paper layer (5).

2. A degradable high-barrier double-sided directly coated paper according to claim 1, wherein the heat-sealing layer (1) is an ethylene acrylate coating, an ethylene vinyl acetate coating, or an ethylene maleic anhydride copolymer coating.

3. A degradable high-barrier double-sided directly coated paper according to claim 1, wherein The barrier layer II (2) is a coating with certain water barrier properties and capable of heat sealing, and the water vapor transmission rate of the coating is < 1 g / m 2 / 24 h.

4. A degradable high-barrier double-sided directly coated paper according to claim 1, wherein the aluminized layer (3) is a metallic aluminum layer with a nano-thickness grade vacuum-evaporated on the upper surface of the barrier layer two (2).

5. A degradable high-barrier double-sided directly coated paper according to claim 1, wherein The first barrier layer (4) is a coating that can seal the pores of the paper and block oxygen, with an oxygen transmission rate < 1 cm 3 / m 2 / 24 h at 25°C.

6. A degradable high-barrier double-sided directly coated paper according to claim 1, wherein the base paper layer (5) is a paper-based material with a basis weight range of 30 - 340 g / ㎡.

7. A degradable high-barrier double-sided directly coated paper according to claim 1, wherein the evaporation coating layer (6) is a metallic or oxide evaporation coating layer obtained by vacuum evaporation, with a thickness of 20 - 30 nm.

8. A degradable high-barrier double-sided directly coated paper according to claim 1, wherein the protective layer (7) is a polyacrylate-based varnish with a coating viscosity of 18 - 20 s and a coating thickness of 1 μm.

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