Moisture-proof packaging material and preparation method thereof

Abstract

The invention provides a preparation method of a moistureproof packaging material, which comprises the following steps: uniformly coating the surface of a base film with a moistureproof mixture, and drying to form a moistureproof layer, comprising 30%-40% of an acrylate copolymer, 20%-30% of polybutyl methacrylate, 20%-30% of cellulose acetate propionate and 5%-10% of cellulose acetate butyrate. Nickel plate laser images and texts are embossed on the surface, away from the base film, of the damp-proof layer, so that the damp-proof layer is provided with an image and text information surface; forming an aluminum layer on the moisture-proof layer through evaporation, and at least covering the surface of the graphic and text information with the aluminum layer to obtain a moisture-proof information film; the moisture-proof information film is adhered to at least one of the two opposite surfaces of the card paper through an adhesive, and the aluminum layer is adhered to the card paper. The invention further provides a damp-proof packaging material. The damp-proof packaging material is beneficial for improving the damp-proof performance.

Description

Technical Field

[0001] The invention relates to the technical field of packaging materials, and in particular to a moisture-proof packaging material and a preparation method thereof. Background Art

[0002] At present, some paper box packaging has high requirements for moisture-proof performance and adopts direct printing on paper. The moisture of the paper itself and the moisture of the external environment can easily penetrate the packaging and affect the storage of the packaging.

[0003] Currently, materials with good barrier properties, such as PVDC (polyvinylidene chloride), PA (polyamide), EVOH (ethylene-vinyl alcohol copolymer), etc., do not blend well with the coatings, glues, varnishes, and back coatings used in laser paper processing, and cannot be added directly, which limits the moisture resistance of current moisture-proof packaging materials. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, an object of the present invention is to provide a moisture-proof packaging material and a preparation method thereof that is beneficial to improving moisture resistance.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0006] A method for preparing a moisture-proof packaging material comprises the following steps:

[0007] The moisture-proof mixture is evenly coated on the surface of the base film, and dried to form a moisture-proof layer, wherein the moisture-proof layer comprises, by weight percentage, 30%-40% of an acrylic copolymer, 20%-30% of polybutyl methacrylate, 20%-30% of cellulose acetate propionate, and 5%-10% of cellulose acetate butyrate;

[0008] Imprinting laser images and texts on a nickel plate onto the surface of the moisture-proof layer away from the base film, so that the moisture-proof layer has a surface with image and text information;

[0009] An aluminum layer is formed by evaporating on the moisture-proof layer, wherein the aluminum layer at least covers the surface of the graphic information to obtain a moisture-proof information film;

[0010] The moisture-proof information film is bonded to at least one of two opposite surfaces of the card paper by an adhesive, and the aluminum layer is bonded to the card paper.

[0011] In some possible implementations, the acrylic ester copolymer is obtained by copolymerizing 60%-90% of methyl methacrylate, 10%-20% of acrylonitrile and 5%-10% of vinyl chloride, by weight percentage.

[0012] In some possible implementations, the dry coating weight of the moisture-proof layer is 1.2-1.3 g / m 2 .

[0013] In some possible implementations, the pressure for forming the graphic information surface is 30-35 Mpz and the temperature is 170-180°C.

[0014] In some possible implementations, the aluminum layer is formed in a vacuum environment of -50,000 to 60,000 mba.

[0015] In some possible implementations, the adhesive includes butyl acrylate-acrylic acid copolymer, styrene-acrylic acid copolymer and water, and the weight ratio of butyl acrylate-acrylic acid copolymer to styrene-acrylic acid copolymer is 8:2, and the wet coating amount of the adhesive is 4-5 g / m 2 .

[0016] In some possible implementations, the drying temperature of the adhesive is 100-150° C., and the laminating speed of the moisture-proof information film is 80-120 m / mim.

[0017] The present application also provides a moisture-proof packaging material, comprising:

[0018] A moisture-proof information film, the moisture-proof information film comprising a stacked moisture-proof layer and an aluminum layer, the moisture-proof layer having a graphic information surface, the moisture-proof layer comprising, by weight percentage, 30%-40% of an acrylic copolymer, 20%-30% of polybutyl methacrylate, 20%-30% of cellulose acetate propionate, and 5%-10% of cellulose acetate butyrate, the aluminum layer at least covering the graphic information surface; and

[0019] Cardboard, at least one of the two opposite surfaces of the cardboard is bonded to the moisture-proof information film through an adhesive, and the aluminum layer is bonded to the cardboard.

[0020] In some possible embodiments, the acrylic copolymer is obtained by copolymerizing 60%-80% methyl methacrylate, 10%-20% acrylonitrile and 5%-10% vinyl chloride by weight, and the dry coating amount of the moisture-proof layer is 1.2-1.3 g / m 2 .

[0021] In some possible implementations, the adhesive includes butyl acrylate-acrylic acid copolymer and styrene-acrylic acid copolymer, and the weight ratio of butyl acrylate-acrylic acid copolymer to styrene-acrylic acid copolymer is 8:2, and the wet coating amount of the adhesive is 4-6 g / m 2 .

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] In the present application, a moisture-proof information film is bonded to the cardboard, and the moisture-proof information film includes a stacked moisture-proof layer and an aluminum layer, and the moisture-proof layer includes acrylic copolymers, polybutyl methacrylate, cellulose acetate propionate, and cellulose acetate butyrate. The synergistic cooperation of the moisture-proof layer and the aluminum layer makes the moisture-proof packaging material of the present application have excellent moisture-proof properties.

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a cross-sectional view of forming a moisture-proof layer on a base film according to an embodiment of the present application;

[0026] Figure 2 For Figure 1 A cross-sectional view of a moisture-proof information film obtained by forming an aluminum layer on the moisture-proof layer shown;

[0027] Figure 3 This is a cross-sectional view of bonding a moisture-proof information film to cardboard.

[0028] Description of Figure Numbers:

[0029] 10 - base film; 20 - moisture-proof layer; 21 - graphic information surface; 30 - aluminum layer; 40 - moisture-proof information film; 50 - cardboard. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0031] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there can be a centered element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or there can be a centered element. When an element is referred to as "arranged on" another element, it can be arranged on the other element or there can be a centered element.

[0032] The present application provides a method for preparing a moisture-proof packaging material, comprising the following steps:

[0033] Step 1, refer to Figure 1The moisture-proof mixture is evenly coated on the surface of the base film 10 and dried to form a moisture-proof layer 20. The moisture-proof layer 20 includes, by weight percentage, 30%-40% of an acrylic copolymer, 20%-30% of polybutyl methacrylate, 20%-30% of cellulose acetate propionate, and 5%-10% of cellulose acetate butyrate. Exemplarily, the base film 10 may be a release film, and the base film 10 may be peeled off in a subsequent step, thereby retaining the moisture-proof layer 20.

[0034] Exemplarily, the moisture-proof layer 20 may include 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40% or percentages between the above values, by weight percentage. Preferably, the weight percentage of the acrylic copolymer is 37%.

[0035] Exemplarily, by weight percentage, the moisture barrier 20 may include 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30% or polybutyl methacrylate in a percentage between the above values. Preferably, the weight percentage of polybutyl methacrylate is 28%.

[0036] For example, the moisture barrier layer 20 may include 20%, 21%, 22%, 23%, 24%, 25% or a percentage between the above values ​​by weight. Preferably, the weight percentage of cellulose acetate propionate is 25%.

[0037] Exemplarily, by weight percentage, the moisture barrier 20 may include 5%, 6%, 7%, 8%, 9%, 10% or a percentage between the above values ​​of cellulose acetate butyrate. Preferably, the weight percentage of cellulose acetate butyrate is 10%. The preferred percentages of the above components of the moisture barrier 20 are conducive to improving the stability of the product.

[0038] In some embodiments, the acrylic copolymer is obtained by copolymerizing 60%-90% methyl methacrylate, 10%-20% acrylonitrile and 5%-10% vinyl chloride by weight. The acrylic copolymer obtained by copolymerizing the above raw materials has a strong barrier to water vapor after film formation, and can improve the overall moisture-proof performance of paper.

[0039] For example, the acrylic copolymer may include 60%, 65%, 70%, 75%, 80%, 85%, 90% or a percentage between the above values ​​of methyl methacrylate by weight. Preferably, the weight percentage of methyl methacrylate is 77%.

[0040] For example, the acrylic copolymer may include 10%, 12%, 15%, 17%, 19%, 20% or acrylonitrile in weight percentage. Preferably, the weight percentage of acrylonitrile is 15%.

[0041] For example, the acrylic copolymer may include 5%, 10% or a percentage between the above values ​​by weight of vinyl chloride. Preferably, the weight percentage of vinyl chloride is 8%.

[0042] For example, the acrylic copolymer can be provided by Shanghai Weikai Optoelectronics Technology Co., Ltd., with model number Z-1001.

[0043] In another embodiment, the acrylic ester copolymer can be obtained by copolymerizing ethyl acrylate or butyl acrylate with other comonomers, such as vinyl acetate.

[0044] In some embodiments, the dry coating weight of the moisture-proof layer 20 is 1.2-1.3 g / m 2 The selection of dry coating amount is helpful for the formation of moisture-proof layer and is suitable for the subsequent film pressing effect.

[0045] Step 2: Laser-print the nickel plate onto the surface of the moisture-proof layer 20 facing away from the base film 10, so that the moisture-proof layer 20 has a graphic information surface 21. Specifically, a molding machine can be used to mold and form the graphic information surface 21. The mechanism of forming the graphic information surface is well known, so the specific structure and specific working mechanism of the molding machine are not repeated.

[0046] In some embodiments, the pressure for forming the graphic information surface 21 is 30-35 Mpz, and the temperature is 170-180° C. The combination of the above pressure and temperature is the parameter for the graphic information surface 21 to achieve the best molding effect.

[0047] Step 3, refer to Figure 2 An aluminum layer 30 is formed by vapor deposition on the moisture-proof layer. The aluminum layer 30 at least covers the graphic information surface 21 to obtain a moisture-proof information film 40.

[0048] In some embodiments, the aluminum layer 30 is formed in a vacuum environment of -50000 to 60000 mba. The selection of vacuum degree is conducive to improving the uniformity of aluminum plating and the tightness of the plating layer, thereby helping to further improve the barrier property against water vapor.

[0049] Step 4, refer to Figure 3 The moisture-proof information film 40 is bonded to at least one of the two opposite surfaces of the cardboard 50 by an adhesive, and the aluminum layer 30 is bonded to the cardboard 50. Exemplarily, the cardboard 50 can be a general packaging paper, such as kraft paper, white board paper, corrugated paper, parchment paper, glassine paper, tar paper, and moisture-proof paper.

[0050] In some embodiments, the adhesive comprises butyl acrylate-acrylic acid copolymer, styrene-acrylic acid copolymer and water, wherein the weight ratio of butyl acrylate-acrylic acid copolymer to styrene-acrylic acid copolymer is 8:2, and the wet coating amount of the adhesive is 4-5 g / m 2 For example, in the butyl acrylate-acrylic acid copolymer, the butyl acrylate:acrylic acid ratio may be 1:1, and in the styrene-acrylic acid copolymer, the styrene:acrylic acid ratio may be 2:1. The specific composition of the adhesive is conducive to further improving the water vapor barrier property.

[0051] In some embodiments, the drying temperature of the adhesive is 100-150° C., and the laminating speed of the moisture-proof information film 40 is 80-120 m / mim. The selection of the above temperature and speed facilitates the adhesive to dry and form a film quickly.

[0052] In some embodiments, the base film 10 of the moisture-proof information film 40 may be peeled off after bonding.

[0053] Another embodiment of the present application also provides a moisture-proof packaging material, which includes a moisture-proof information film 40 and a cardboard 50. The moisture-proof information film 40 includes a stacked moisture-proof layer 20 and an aluminum layer 30. The moisture-proof layer 20 has a graphic information surface 21. The moisture-proof layer 20 includes 30%-40% of an acrylic copolymer, 20%-30% of polybutyl methacrylate, 20%-30% of cellulose acetate propionate, and 5%-10% of cellulose acetate butyrate by weight. The aluminum layer 30 at least covers the graphic information surface 21. At least one of the two opposite surfaces of the cardboard 50 is bonded to the moisture-proof information film 40 by an adhesive, and the aluminum layer 30 is bonded to the cardboard 50. Since the materials of each layer in this embodiment are the same as the materials corresponding to each layer in the preparation method, they are not repeated.

[0054] In some embodiments, the acrylic copolymer is obtained by copolymerizing 60%-80% methyl methacrylate, 10%-20% acrylonitrile and 5%-10% vinyl chloride by weight, and the dry coating amount of the moisture-proof layer 20 is 1.2-1.3 g / m 2 .

[0055] In some embodiments, the adhesive includes butyl acrylate-acrylic acid copolymer and styrene-acrylic acid copolymer, and the weight ratio of butyl acrylate-acrylic acid copolymer to styrene-acrylic acid copolymer is 8:2, and the wet coating amount of the adhesive is 4-5 g / m 2 For example, in terms of weight ratio, in the butyl acrylate-acrylic acid copolymer, the ratio of butyl acrylate to acrylic acid may be 1:1, and in the styrene-acrylic acid copolymer, the ratio of styrene to acrylic acid may be 1:2.

[0056] In this embodiment, the selected value range or preferred range of each layer or each component may be the same as that of the corresponding layers and the corresponding components in the preparation method, and therefore, they are not described in detail.

[0057] For details, please refer to the following specific embodiments.

[0058] Embodiment 1:

[0059] The moisture-proof mixture is evenly coated on the surface of the base film 10 and dried to form a moisture-proof layer 20. The moisture-proof layer 20 includes, by weight percentage, 30% of an acrylic copolymer (acrylic copolymer, by weight percentage, is obtained by copolymerizing 80% of methyl methacrylate, 15% of acrylonitrile and 5% of vinyl chloride, which can be provided by Shanghai Weikai Optoelectronics Technology Co., Ltd., model Z-1001, and the acrylic copolymers in the following embodiments are also), 30% of polybutyl methacrylate, 30% of cellulose acetate propionate, and 10% of cellulose acetate butyrate. The dry coating amount of the moisture-proof layer 20 is 1.2 g / m 2 .

[0060] The nickel plate laser prints images on the surface of the moisture-proof layer 20 away from the base film 10, so that the moisture-proof layer 20 has an image information surface 21. The pressure for forming the image information surface 21 is 30Mpz and the temperature is 175°C.

[0061] In a vacuum environment of -55000mba, an aluminum layer 30 is formed on the moisture-proof layer 20 by vapor deposition. The aluminum layer 30 at least covers the graphic information surface 21 to obtain a moisture-proof information film 40.

[0062] The moisture-proof information film 40 is bonded to each of the two opposite surfaces of the cardboard 50 by an adhesive, and the aluminum layer 30 is bonded to the cardboard 50. The adhesive includes butyl acrylate-acrylic acid copolymer and styrene-acrylic acid copolymer. The weight ratio of butyl acrylate-acrylic acid copolymer to styrene-acrylic acid copolymer is 8:2, and the wet coating amount of the adhesive is 6g / m 2 The drying temperature of the adhesive is 105°C, and the laminating speed of the moisture-proof information film 40 is 100 m / mim. In this embodiment, the water vapor permeability of the product is 25 g / m 2 ·24h.

[0063] Embodiment 2:

[0064] The moisture-proof mixture is evenly coated on the surface of the base film 10 and dried to form a moisture-proof layer 20. The moisture-proof layer 20 includes, by weight percentage, 40% of an acrylic copolymer (acrylic copolymer, by weight percentage, obtained by copolymerizing 80% of methyl methacrylate, 15% of acrylonitrile and 5% of vinyl chloride), 20% of polybutyl methacrylate, 20% of cellulose acetate propionate and 10% of cellulose acetate butyrate. The dry coating amount of the moisture-proof layer 20 is 1.25 g / m 2 .

[0065] The nickel plate laser prints images on the surface of the moisture-proof layer 20 away from the base film 10, so that the moisture-proof layer 20 has an image information surface 21. The pressure for forming the image information surface 21 is 30Mpz and the temperature is 170°C.

[0066] In a vacuum environment of 60000 mba, an aluminum layer 30 is formed on the moisture-proof layer 20 by vapor deposition. The aluminum layer 30 at least covers the graphic information surface 21 to obtain a moisture-proof information film 40 .

[0067] The moisture-proof information film 40 is bonded to each of the two opposite surfaces of the cardboard 50 by an adhesive, and the aluminum layer 30 is bonded to the cardboard 50. The adhesive comprises butyl acrylate-acrylic acid copolymer, styrene-acrylic acid copolymer and water, and the weight ratio of butyl acrylate-acrylic acid copolymer to styrene-acrylic acid copolymer is 8:2, and the wet coating amount of the adhesive is 4g / m 2 The drying temperature of the adhesive is 150°C, and the laminating speed of the moisture-proof information film 40 is 120 m / m. In this embodiment, the water vapor transmission rate of the product is 27 g / m 2 ·24h.

[0068] Embodiment 3:

[0069] The moisture-proof mixture is evenly coated on the surface of the base film 10 and dried to form a moisture-proof layer 20. The moisture-proof layer 20 includes 40% of an acrylic copolymer (acrylic copolymer, by weight, obtained by copolymerization of 80% of methyl methacrylate, 15% of acrylonitrile and 5% of vinyl chloride), 20% of polybutyl methacrylate, 30% of cellulose acetate propionate and 5% of cellulose acetate butyrate. The dry coating amount of the moisture-proof layer 20 is 1.3 g / m 2 .

[0070] The nickel plate laser embosses the image and text on the surface of the moisture-proof layer 20 away from the base film 10, so that the moisture-proof layer 20 has an image and text information surface 21. The pressure for forming the image and text information surface 21 is 35Mpz and the temperature is 180°C.

[0071] In a vacuum environment of -55000mba, an aluminum layer 30 is formed on the moisture-proof layer 20 by vapor deposition. The aluminum layer 30 at least covers the graphic information surface 21 to obtain a moisture-proof information film 40.

[0072] The moisture-proof information film 40 is bonded to each of the two opposite surfaces of the cardboard 50 by an adhesive, and the aluminum layer 30 is bonded to the cardboard 50. The adhesive includes butyl acrylate-acrylic acid copolymer and styrene-acrylic acid copolymer. The weight ratio of butyl acrylate-acrylic acid copolymer to styrene-acrylic acid copolymer is 8:2, and the wet coating amount of the adhesive is 6g / m 2 The drying temperature of the adhesive is 100°C, and the laminating speed of the moisture-proof information film 40 is 800 m / mim. In this embodiment, the water vapor permeability of the product is 30 g / m 2 ·24h.

[0073] Comparative Example 1:

[0074] The difference from Example 2 is that the moisture-proof layer 20 is bonded to only one of the two opposite surfaces of the cardboard 50 by an adhesive. In this example, the water vapor transmission rate of the product is 1103 g / m 2 ·24h.

[0075] Comparative Example 2:

[0076] The difference from Example 3 is that the aluminum layer 30 is deposited by evaporation on only one of the two opposite surfaces of the cardboard 50. In this example, the water vapor transmission rate of the product is 205 g / m 2 ·24h.

[0077] Comparative Example 3:

[0078] The moisture-proof packaging material only includes white cardboard. In this comparative example, the measured water vapor transmission rate is 2000-3000g / m 2 ·24h.

[0079] Embodiment 4:

[0080] The moisture-proof mixture is evenly coated on the surface of the base film 10 and dried to form a moisture-proof layer 20. The moisture-proof layer 20 includes, by weight percentage, 30% of an acrylic copolymer (acrylic copolymer, by weight percentage, is obtained by copolymerizing 80% of methyl methacrylate, 15% of acrylonitrile and 5% of vinyl chloride), 30% of polybutyl methacrylate, 30% of cellulose acetate propionate and 10% of cellulose acetate butyrate. The dry coating amount of the moisture-proof layer 20 is 1.2 g / m 2 .

[0081] The nickel plate laser prints images on the surface of the moisture-proof layer 20 away from the base film 10, so that the moisture-proof layer 20 has an image information surface 21. The pressure for forming the image information surface 21 is 30Mpz and the temperature is 175°C.

[0082] In a vacuum environment of -55000mba, an aluminum layer 30 is formed on the moisture-proof layer 20 by vapor deposition. The aluminum layer 30 at least covers the graphic information surface 21 to obtain a moisture-proof information film 40.

[0083] The moisture-proof information film 40 is bonded to each of the two opposite surfaces of the cardboard 50 by an adhesive, and the aluminum layer 30 is bonded to the cardboard 50. The adhesive includes butyl acrylate-acrylic acid copolymer and styrene-acrylic acid copolymer. In terms of weight percentage, the butyl acrylate-acrylic acid copolymer: styrene-acrylic acid copolymer is 8:2, and the wet coating amount of the adhesive is 6g / m 2 The drying temperature of the adhesive is 105°C, and the laminating speed of the moisture-proof information film 40 is 100 m / mim. The water absorption value of the moisture-proof paper is 1.5 g / m 2 (The front and back sides are the same).

[0084] Comparative Example 4:

[0085] The difference from Example 7 is that the moisture-proof packaging material only includes cardboard, and only the water absorption value of the cardboard is tested. The water absorption value of the front side of the paper is 22g / m, and the water absorption value of the back side of the paper is 38g / m 2 The test data shows that the moisture-proof layer has a significant effect in blocking water and water vapor.

[0086] The present application measures water vapor transmission rate by the cup method of GB1037-88 "Test method for water vapor permeability of plastic film and sheet".

[0087] The present application determines the water absorption of paper surface by GB / T 461.3-2005 Determination of water absorption of paper and paperboard (immersion method).

[0088] By comparing the above embodiments and comparative examples, it is found that the synergistic cooperation of the moisture-proof layer and the aluminum layer is beneficial to significantly improve the moisture-proof property of the moisture-proof packaging material.

[0089] In the present application, a moisture-proof information film is bonded to the cardboard, and the moisture-proof information film includes a stacked moisture-proof layer and an aluminum layer, and the moisture-proof layer includes acrylic copolymers, polybutyl methacrylate, cellulose acetate propionate, and cellulose acetate butyrate. The synergistic cooperation of the moisture-proof layer and the aluminum layer makes the moisture-proof packaging material of the present application have excellent moisture-proof properties.

[0090] The moisture-proof packaging material provided in this application can be used for packaging food and cigarettes.

[0091] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A method for preparing a moisture-proof packaging material, characterized in that: The following steps are involved: The moisture-proof mixture is evenly coated on the surface of the base film, and dried to form a moisture-proof layer, wherein the moisture-proof layer comprises, by weight percentage, 30%-40% of an acrylic copolymer, 20%-30% of polybutyl methacrylate, 20%-30% of cellulose acetate propionate, and 5%-10% of cellulose acetate butyrate; Imprinting laser images and texts on a nickel plate onto the surface of the moisture-proof layer away from the base film, so that the moisture-proof layer has a surface with image and text information; An aluminum layer is formed by evaporating on the moisture-proof layer, wherein the aluminum layer at least covers the surface of the graphic information to obtain a moisture-proof information film; The moisture-proof information film is bonded to at least one of two opposite surfaces of the card paper by an adhesive, and the aluminum layer is bonded to the card paper.

2. The preparation method according to claim 1, characterized in that The acrylic ester copolymer is obtained by copolymerizing 60%-90% of methyl methacrylate, 10%-20% of acrylonitrile and 5%-10% of vinyl chloride by weight percentage.

3. The preparation method according to claim 1, characterized in that: The dry coating amount of the moisture-proof layer is 1.2-1.3 g / m 2 .

4. The preparation method according to claim 1, characterized in that: The pressure for forming the graphic information surface is 30-35Mpz and the temperature is 170-180°C.

5. The preparation method according to claim 1, characterized in that: The aluminum layer is formed in a vacuum environment of -50000 to 60000 mba.

6. The preparation method according to claim 1, characterized in that: The adhesive comprises butyl acrylate-acrylic acid copolymer, styrene-acrylic acid copolymer and water. In terms of weight percentage, the ratio of butyl acrylate-acrylic acid copolymer to styrene-acrylic acid copolymer is 8:

2. The wet coating amount of the adhesive is 4-6 g / m 2 .

7. The preparation method according to claim 6, characterized in that: The drying temperature of the adhesive is 100-150° C., and the laminating speed of the moisture-proof information film is 80-120 m / mim.

8. A moisture-proof packaging material, characterized in that: include: A moisture-proof information film, the moisture-proof information film comprising a stacked moisture-proof layer and an aluminum layer, the moisture-proof layer having a graphic information surface, the moisture-proof layer comprising, by weight percentage, 30%-40% of an acrylic copolymer, 20%-30% of polybutyl methacrylate, 20%-30% of cellulose acetate propionate, and 5%-10% of cellulose acetate butyrate, the aluminum layer at least covering the graphic information surface; as well as Card paper, at least one of the two opposite surfaces of the card paper is bonded to the moisture-proof information film through an adhesive, and the aluminum layer is bonded to the card paper.

9. The moisture-proof packaging material according to claim 8, characterized in that: The acrylic copolymer is obtained by copolymerizing 60%-80% methyl methacrylate, 10%-20% acrylonitrile and 5%-10% vinyl chloride by weight. The dry coating amount of the moisture-proof layer is 1.2-1.3 g / m 2 .

10. The moisture-proof packaging material according to claim 8, characterized in that: The adhesive comprises butyl acrylate-acrylic acid copolymer and styrene-acrylic acid copolymer. The weight ratio of butyl acrylate-acrylic acid copolymer to styrene-acrylic acid copolymer is 8:

2. The wet coating amount of the adhesive is 4-5 g / m 2 .

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