A water-barrier, air-barrier, and waterproof paper bag adhesive and its preparation method

Abstract

This invention relates to the field of adhesive technology, specifically to a water-blocking, air-barrier, and waterproof paper bag adhesive and its preparation method. The water-blocking, air-barrier, and waterproof paper bag adhesive includes a waterproof component and a heat-sealing component. The waterproof component comprises the following raw materials in parts by weight: ethylene 5-15, vinyl acetate 20-50, styrene 10-15, butyl acrylate 15-18, acrylic acid 20-35, isooctyl acrylate 25-35, polysiloxane 5-10, styrene-butadiene latex 10-20, metal salt 2-4, film-forming agent 1-2, additives 1-4, and deionized water 60-80. Applying this waterproof paper bag adhesive to the surface of a paper bag enables the paper bag to achieve a waterproof and air-barrier effect, making the paper bag suitable for packaging products requiring waterproofing and leak-proof properties.

Description

Technical Field

[0001] This invention relates to the field of adhesive technology, specifically to a water-blocking, air-barrier, and waterproof paper bag adhesive and its preparation method. Background Technology

[0002] Due to the demands for environmental protection, energy conservation, safety, and high-speed production, rapid paper bag production has become a global trend. Compared to plastic bags, paper bags are made from trees, a renewable resource, and are also biodegradable and recyclable, thus enjoying widespread use. However, ordinary paper bags lack waterproof and airtight properties, making them unsuitable for packaging products requiring waterproofing and leak-proof features. Summary of the Invention

[0003] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this invention is to provide a water-blocking, air-proof, and waterproof paper bag adhesive and its preparation method, which, when applied to the surface of a paper bag, enables the paper bag to have a waterproof and air-proof effect.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] A water-blocking, air-barrier, and waterproof paper bag adhesive includes a waterproof component and a heat-sealing component;

[0006] The waterproofing component comprises the following raw materials in parts by weight:

[0007]

[0008]

[0009] The heat-sealing component includes an acrylic emulsion.

[0010] The metal salt is at least one of chromium nitrate, aluminum nitrate, and aluminum chloride.

[0011] The additives include emulsifiers, buffers, and initiators, and the mass ratio of the emulsifiers, buffers, and initiators is 5-8:1-2:1-3.

[0012] The emulsifier includes at least one of ammonium succinate, alkylphenol polyoxyethylene ether, and sodium dodecyl sulfate.

[0013] The initiator comprises a hydrogen peroxide aqueous solution with a mass concentration of 2%-3%, a ferrous sulfate aqueous solution with a mass concentration of 3-4%, and a ferrous ammonium sulfate aqueous solution with a mass concentration of 7-8%, wherein the mass ratio of the hydrogen peroxide aqueous solution, the ferrous sulfate aqueous solution, and the ferrous ammonium sulfate aqueous solution is 10-20:1-2:1.

[0014] The film-forming agent is at least one of maleic acid, tartaric acid, and acetic acid.

[0015] The above-mentioned method for preparing water-blocking, air-barrier, and waterproof paper bag adhesive includes a waterproof component and a heat-sealing component. The preparation method of the waterproof component is as follows:

[0016] Step 1: Mix ethylene, vinyl acetate, styrene, butyl acrylate, acrylic acid, isooctyl acrylate, polysiloxane, styrene-butadiene latex, metal salt, film-forming agent, emulsifier, buffer, and deionized water, and stir at room temperature to form a pre-emulsion.

[0017] Step 2: After heating the pre-emulsion to 80-100℃ in a nitrogen atmosphere, the initiator is added dropwise to the pre-emulsion while stirring. After the addition is complete, the temperature is maintained for 2-3 hours, and finally cooled down to obtain the waterproof component.

[0018] The initiator is added at a rate of 1-2 kg / min.

[0019] In step one, the stirring speed is 500-800 r / min, and the stirring time is 0.5-1 h.

[0020] The beneficial effects of this invention are as follows:

[0021] The waterproof paper bag adhesive of the present invention comprises a waterproof component and a heat-sealing component. In use, the waterproof component is first applied to the surface of the paper bag. After the waterproof component dries and forms a film, the heat-sealing component is then applied to form a heat-sealing layer. The paper bag can be bonded together by heating the heat-sealing layer. The processing method is simple and can effectively improve the waterproofness, air tightness, high and low temperature resistance, and toughness of the paper bag, increase the strength of the paper bag, make the paper bag less prone to breakage, and make the paper bag suitable for packaging products that require waterproof and air-leakage prevention performance.

[0022] The waterproofing component of this invention is prepared by mixing ethylene, vinyl acetate, styrene, butyl acrylate, acrylic acid, isooctyl acrylate, polysiloxane, styrene-butadiene latex, metal salts, film-forming agents, and additives, using deionized water as a solvent. The reaction of ethylene and vinyl acetate forms an ethylene-vinyl acetate copolymer emulsion with good water resistance, corrosion resistance, low-temperature resistance, high-temperature exposure resistance, and high toughness, exhibiting good flexibility and coating processability. The addition of butyl acrylate and isooctyl acrylate reacts with vinyl acetate to form a vinyl acetate-butyl acrylate-isooctyl acrylate copolymer emulsion. The addition of acrylates helps reduce the viscosity of the waterproofing component and improve its coating performance. When the components are mixed in the above weight proportions, the resulting vinyl acetate-butyl acrylate-isooctyl acrylate copolymer emulsion exhibits optimal waterproofing performance and better softness, further enhancing the coating performance of the waterproofing component. The addition of styrene, butyl acrylate, and acrylic acid reacts to form a styrene-butyl acrylate-acrylic acid copolymer emulsion with good waterproofing properties, further improving the waterproofing performance of the waterproofing component. Polysiloxanes exhibit excellent properties. When blended with monomers such as ethylene, vinyl acetate, styrene, butyl acrylate, acrylic acid, and isooctyl acrylate, the waterproofing performance, molding properties, and abrasion resistance of the waterproof adhesive can be improved. This invention further enhances the water resistance and flexibility of the waterproof adhesive by adding styrene-butadiene latex. The addition of metal salts and organic acids, specifically the blending of metal salts with monomers such as ethylene, vinyl acetate, styrene, butyl acrylate, acrylic acid, and isooctyl acrylate, can further improve water resistance. The combined effect of metal salts and organic acids not only accelerates the film-forming speed of the adhesive but also gives the film-forming adhesive better hot water resistance.

[0023] The waterproofing component of this invention is formed by compounding and reacting various monomers to create a mixed emulsion containing ethylene-vinyl acetate copolymer, vinyl acetate-butyl acrylate-isooctyl acrylate copolymer, and styrene-butyl acrylate-acrylic acid copolymer. The interaction of different polymers with polysiloxane, styrene-butadiene latex, metal salts, and organic acids improves the waterproofing performance and toughness of the resulting waterproofing component. It also exhibits good resistance to low temperatures and high temperatures. The component has a moderate viscosity, making it suitable for coating and quick film formation. When this waterproofing component is coated onto the surface of a paper bag, it effectively improves the waterproofing, high and low temperature resistance, and toughness of the paper bag, making it less prone to breakage and giving it better strength. This makes the paper bag suitable for packaging products that require waterproofing and airtightness. Detailed Implementation

[0024] To make the objectives, technical solutions, and technical effects of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. The embodiments described below are some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art in conjunction with the embodiments of the present invention without creative effort are within the scope of protection of the present invention. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall be followed; where the manufacturers of reagents or instruments are not specified, they are all conventional products that can be purchased commercially.

[0025] In the description of this invention, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0026] In the description of this invention, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, "at least one of a, b, or c", or "at least one of a, b, and c", can both mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple.

[0027] It should be understood that the weights of the relevant components mentioned in the embodiments of this invention can refer not only to the specific content of each component, but also to the proportional relationship between the weights of the components. Therefore, any scaling up or down of the content of the relevant components according to the embodiments of this invention is within the scope of this invention. Specifically, the weights mentioned in the embodiments of this invention can be well-known units of mass in the chemical industry, such as μg, mg, g, and kg.

[0028] Furthermore, unless the context explicitly uses it otherwise, the singular form of a word should be understood as including the plural form of that word. The terms "comprising" or "having" are intended to specify the presence of a feature, quantity, step, operation, element, part, or combination thereof, but are not intended to exclude the presence or possible addition of one or more other features, quantities, steps, operations, elements, parts, or combinations thereof.

[0029] A water-blocking, air-barrier, and waterproof paper bag adhesive includes a waterproof component and a heat-sealing component;

[0030] The waterproofing component comprises the following raw materials in parts by weight:

[0031]

[0032] The waterproof paper bag adhesive of the present invention comprises a waterproof component and a heat-sealing component. In use, the waterproof component is first applied to the surface of the paper bag. After the waterproof component dries and forms a film, the heat-sealing component is then applied to form a heat-sealing layer. The paper bag can be bonded together by heating the heat-sealing layer. The processing method is simple and can effectively improve the waterproofness, air tightness, high and low temperature resistance, and toughness of the paper bag, increase the strength of the paper bag, make the paper bag less prone to breakage, and make the paper bag suitable for packaging products that require waterproof and air-leakage prevention performance.

[0033] The waterproofing component of this invention is prepared by mixing ethylene, vinyl acetate, styrene, butyl acrylate, acrylic acid, isooctyl acrylate, polysiloxane, styrene-butadiene latex, metal salts, film-forming agents, and additives, using deionized water as a solvent. The reaction of ethylene and vinyl acetate forms an ethylene-vinyl acetate copolymer emulsion with good water resistance, corrosion resistance, low-temperature resistance, high-temperature exposure resistance, and high toughness, exhibiting good flexibility and coating processability. The addition of butyl acrylate and isooctyl acrylate reacts with vinyl acetate to form a vinyl acetate-butyl acrylate-isooctyl acrylate copolymer emulsion. The addition of acrylates helps reduce the viscosity of the waterproofing component and improve its coating performance. When the components are mixed in the above weight proportions, the resulting vinyl acetate-butyl acrylate-isooctyl acrylate copolymer emulsion exhibits optimal waterproofing performance and better softness, further enhancing the coating performance of the waterproofing component. The addition of styrene, butyl acrylate, and acrylic acid reacts to form a styrene-butyl acrylate-acrylic acid copolymer emulsion with good waterproofing properties, further improving the waterproofing performance of the waterproofing component. Polysiloxanes exhibit excellent properties. When blended with monomers such as ethylene, vinyl acetate, styrene, butyl acrylate, acrylic acid, and isooctyl acrylate, the waterproofing performance, molding properties, and abrasion resistance of the waterproof adhesive can be improved. This invention further enhances the water resistance and flexibility of the waterproof adhesive by adding styrene-butadiene latex. The addition of metal salts and organic acids, specifically the blending of metal salts with monomers such as ethylene, vinyl acetate, styrene, butyl acrylate, acrylic acid, and isooctyl acrylate, can further improve water resistance. The combined effect of metal salts and organic acids not only accelerates the film-forming speed of the adhesive but also gives the film-forming adhesive better hot water resistance.

[0034] The waterproofing component of this invention is formed by compounding and reacting various monomers to create a mixed emulsion containing ethylene-vinyl acetate copolymer, vinyl acetate-butyl acrylate-isooctyl acrylate copolymer, and styrene-butyl acrylate-acrylic acid copolymer. The interaction of different polymers with polysiloxane, styrene-butadiene latex, metal salts, and organic acids improves the waterproofing performance and toughness of the resulting waterproofing component. It also exhibits good resistance to low temperatures and high temperatures. The component has a moderate viscosity, making it suitable for coating and quick film formation. When this waterproofing component is coated onto the surface of a paper bag, it effectively improves the waterproofing, high and low temperature resistance, and toughness of the paper bag, making it less prone to breakage and giving it better strength. This makes the paper bag suitable for packaging products that require waterproofing and airtightness.

[0035] The heat-sealing component includes an acrylic emulsion. Acrylic emulsions possess outstanding water resistance and weather resistance, as well as excellent adhesion. While sealing the paper bag, they work in conjunction with the waterproofing component to enhance the waterproof and weather-resistant properties of the paper bag. The acrylic emulsion used in this invention is commercially available.

[0036] The metal salt is at least one of chromium nitrate, aluminum nitrate, and aluminum chloride. Using the above-mentioned metal salts can better improve the water resistance of the colloid, increase the film-forming speed, and after the waterproof adhesive film is formed, it can better improve the hot water resistance of the coating.

[0037] The additives include emulsifiers, buffers, and initiators, with a mass ratio of 5-8:1-2:1-3. This invention improves the waterproofing effect and toughness of the waterproof coating by using emulsifiers, buffers, and initiators to facilitate the polymerization of monomers through mutual reaction.

[0038] The emulsifier includes at least one of ammonium succinate, alkylphenol polyoxyethylene ether, and sodium dodecyl sulfate.

[0039] The initiator comprises a hydrogen peroxide aqueous solution with a mass concentration of 2%-3%, a ferrous sulfate aqueous solution with a mass concentration of 3-4%, and a ferrous ammonium sulfate aqueous solution with a mass concentration of 7-8%, wherein the mass ratio of the hydrogen peroxide aqueous solution, the ferrous sulfate aqueous solution, and the ferrous ammonium sulfate aqueous solution is 10-20:1-2:1.

[0040] The film-forming agent is at least one of maleic acid, tartaric acid, and acetic acid.

[0041] The buffer is sodium bicarbonate.

[0042] The above-mentioned method for preparing water-blocking, air-barrier, and waterproof paper bag adhesive includes a waterproof component and a heat-sealing component. The preparation method of the waterproof component is as follows:

[0043] Step 1: Mix ethylene, vinyl acetate, styrene, butyl acrylate, acrylic acid, isooctyl acrylate, polysiloxane, styrene-butadiene latex, metal salt, film-forming agent, emulsifier, buffer, and deionized water, and stir at room temperature to form a pre-emulsion.

[0044] Step 2: After heating the pre-emulsion to 80-100℃ in a nitrogen atmosphere, the initiator is added dropwise to the pre-emulsion while stirring. After the addition is complete, the temperature is maintained for 2-3 hours, and finally cooled down to obtain the waterproof component.

[0045] The initiator is added at a rate of 1-2 kg / min.

[0046] In step one, the stirring speed is 500-800 r / min, and the stirring time is 0.5-1 h.

[0047] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments. The content mentioned in the embodiments is not intended to limit the present invention.

[0048] Example 1

[0049] A water-blocking, air-barrier, and waterproof paper bag adhesive includes a waterproof component and a heat-sealing component;

[0050] The waterproofing component comprises the following raw materials in parts by weight:

[0051]

[0052] The heat-sealing component includes an acrylic emulsion.

[0053] The metal salt is chromium nitrate.

[0054] The additives include emulsifiers, buffers, and initiators, and the mass ratio of the emulsifiers, buffers, and initiators is 5:1:1.

[0055] The emulsifier includes alkylphenol polyoxyethylene ether.

[0056] The initiator comprises a 2% (w / w) aqueous solution of hydrogen peroxide, a 3% (w / w) aqueous solution of ferrous sulfate, and a 7% (w / w) aqueous solution of ferrous ammonium sulfate, wherein the mass ratio of the aqueous solution of hydrogen peroxide, the aqueous solution of ferrous sulfate, and the aqueous solution of ferrous ammonium sulfate is 10:1:1.

[0057] The film-forming agent is maleic acid, and the buffer is sodium bicarbonate.

[0058] The above-mentioned method for preparing water-blocking, air-barrier, and waterproof paper bag adhesive includes a waterproof component and a heat-sealing component. The heat-sealing component is an acrylic emulsion, which is commercially available. The preparation method of the waterproof component is as follows:

[0059] Step 1: Mix ethylene, vinyl acetate, styrene, butyl acrylate, acrylic acid, isooctyl acrylate, polysiloxane, styrene-butadiene latex, metal salt, film-forming agent, emulsifier, buffer, and deionized water according to the mass ratio of the above substances, and stir at 500 r / min for 0.5 h at room temperature to form a pre-emulsion.

[0060] Step 2: After heating the pre-emulsion to 80°C in a nitrogen atmosphere, while stirring the pre-emulsion at a stirring speed of 300 r / min, ferrous sulfate aqueous solution, ferrous ammonium sulfate aqueous solution, and hydrogen peroxide aqueous solution are simultaneously added dropwise to the pre-emulsion. After the addition is completed, the temperature is maintained for 2 hours, and finally cooled to room temperature to obtain the waterproof component.

[0061] The dropping rate of the ferrous sulfate aqueous solution, ferrous ammonium sulfate aqueous solution, and hydrogen peroxide aqueous solution is 1 kg / min.

[0062] Example 2

[0063] A water-blocking, air-barrier, and waterproof paper bag adhesive includes a waterproof component and a heat-sealing component;

[0064] The waterproofing component comprises the following raw materials in parts by weight:

[0065]

[0066]

[0067] The heat-sealing component includes an acrylic emulsion, which is commercially available.

[0068] The metal salt is aluminum nitrate.

[0069] The additives include emulsifiers, buffers, and initiators, and the mass ratio of the emulsifiers, buffers, and initiators is 6.5:1.5:2.

[0070] The emulsifier is sodium dodecyl sulfate.

[0071] The initiator comprises a 2.5% hydrogen peroxide aqueous solution, a 3.5% ferrous sulfate aqueous solution, and a 7.5% ferrous ammonium sulfate aqueous solution, wherein the mass ratio of the hydrogen peroxide aqueous solution, the ferrous sulfate aqueous solution, and the ferrous ammonium sulfate aqueous solution is 15:1.5:1.

[0072] The film-forming agent is tartaric acid, and the buffer is sodium bicarbonate.

[0073] The above-mentioned method for preparing water-blocking, air-barrier, and waterproof paper bag adhesive includes a waterproof component and a heat-sealing component. The heat-sealing component is an acrylic emulsion, which is commercially available. The preparation method of the waterproof component is as follows:

[0074] Step 1: According to the mass of each of the above substances, mix ethylene, vinyl acetate, styrene, butyl acrylate, acrylic acid, isooctyl acrylate, polysiloxane, styrene-butadiene latex, metal salt, film-forming agent, emulsifier, buffer and deionized water, and stir at room temperature at a stirring speed of 650 r / min for 0.75 h to form a pre-emulsion.

[0075] Step 2: After heating the pre-emulsion to 90°C in a nitrogen atmosphere, ferrous sulfate aqueous solution, ferrous ammonium sulfate aqueous solution, and hydrogen peroxide aqueous solution are simultaneously added dropwise to the pre-emulsion while stirring at a speed of 300 r / min. After the addition is complete, the temperature is maintained for 2.5 h, and finally cooled to obtain the waterproof component.

[0076] The dropping rate of the ferrous sulfate aqueous solution, ferrous ammonium sulfate aqueous solution, and hydrogen peroxide aqueous solution is 1.5 kg / min.

[0077] Example 3

[0078] A water-blocking, air-barrier, and waterproof paper bag adhesive includes a waterproof component and a heat-sealing component;

[0079] The waterproofing component comprises the following raw materials in parts by weight:

[0080]

[0081] The heat-sealing component is an acrylic emulsion, which is commercially available.

[0082] The metal salt is aluminum chloride.

[0083] The additives include emulsifiers, buffers, and initiators, and the mass ratio of the emulsifiers, buffers, and initiators is 8:2:3.

[0084] The emulsifier is sodium ammonium succinate.

[0085] The initiator comprises a 3% (w / w) aqueous solution of hydrogen peroxide, a 4% (w / w) aqueous solution of ferrous sulfate, and an 8% (w / w) aqueous solution of ferrous ammonium sulfate, wherein the mass ratio of the aqueous solution of hydrogen peroxide, the aqueous solution of ferrous sulfate, and the aqueous solution of ferrous ammonium sulfate is 20:2:1.

[0086] The film-forming agent is maleic acid, and the buffer is sodium bicarbonate.

[0087] The above-mentioned method for preparing water-blocking, air-barrier, and waterproof paper bag adhesive includes a waterproof component and a heat-sealing component. The heat-sealing component is an acrylic emulsion, which is commercially available. The preparation method of the waterproof component is as follows:

[0088] Step 1: According to the mass of each of the above substances, mix ethylene, vinyl acetate, styrene, butyl acrylate, acrylic acid, isooctyl acrylate, polysiloxane, styrene-butadiene latex, metal salt, film-forming agent, emulsifier, buffer and deionized water, and stir at room temperature at a stirring speed of 800 r / min for 1 hour to form a pre-emulsion.

[0089] Step 2: After heating the pre-emulsion to 100°C in a nitrogen atmosphere, while stirring the pre-emulsion at a stirring speed of 300 r / min, ferrous sulfate aqueous solution, ferrous ammonium sulfate aqueous solution, and hydrogen peroxide aqueous solution are simultaneously added dropwise to the pre-emulsion. After the addition is complete, the temperature is maintained for 3 hours, and finally cooled down to obtain the waterproof component.

[0090] The dropping rate of the ferrous sulfate aqueous solution, ferrous ammonium sulfate aqueous solution, and hydrogen peroxide aqueous solution is 2 kg / min.

[0091] Performance testing

[0092] Waterproof paper bags were prepared using the waterproof paper bag adhesives from Examples 1, 2, and 3, respectively.

[0093] The method for preparing waterproof paper bags is as follows: a waterproof component is coated on both sides of the paper. After the waterproof component dries into a film, a heat-sealing component is coated on the edge of the paper. The paper is then folded into the shape of a pre-set paper bag, and the heat-sealing component is heat-pressed using a heat-sealing machine to complete the bonding of the paper bag, thus producing a waterproof paper bag.

[0094] The performance of waterproof paper bags made from the waterproof paper bag adhesives of Examples 1, 2, and 3 was tested.

[0095] Waterproof test: Fill the paper bag coated with waterproof adhesive with the same mass of water, observe the leakage of the paper bag every day, and record the experimental results in Table 1.

[0096] Gas barrier test: Inflate the paper bag coated with waterproof paper bag adhesive to a pressure of 2 kg, then seal the bag opening and test the air leakage of the waterproof paper bag. Record the experimental results in Table 1.

[0097] Table 1: Waterproof and Air-tightness Test Results

[0098] sample Example 1 Example 2 Example 3 Leakage 6 days without leakage 6 days without leakage 6 days without leakage air leak Airtight Airtight Airtight

[0099] The above embodiments are preferred implementations of the present invention. In addition, the present invention can be implemented in other ways. Any obvious substitutions without departing from the concept of the present invention are within the protection scope of the present invention.

Claims

1. A water-blocking, air-barrier, and waterproof paper bag adhesive, characterized in that: Includes waterproofing components and heat-sealing components; The waterproofing component comprises the following raw materials in parts by weight: The metal salt is at least one of chromium nitrate, aluminum nitrate, and aluminum chloride. The film-forming agent is at least one of maleic acid, tartaric acid, and acetic acid; the heat-sealing component includes an acrylic emulsion.

2. The water-blocking, air-barrier, and waterproof paper bag adhesive according to claim 1, characterized in that: The additives include emulsifiers, buffers, and initiators, and the mass ratio of the emulsifiers, buffers, and initiators is 5-8:1-2:1-3.

3. The water-blocking, air-barrier, and waterproof paper bag adhesive according to claim 2, characterized in that: The emulsifier includes at least one of ammonium succinate, alkylphenol polyoxyethylene ether, and sodium dodecyl sulfate.

4. The water-blocking, air-barrier, and waterproof paper bag adhesive according to claim 2, characterized in that: The initiator comprises a hydrogen peroxide aqueous solution with a mass concentration of 2%-3%, a ferrous sulfate aqueous solution with a mass concentration of 3-4%, and a ferrous ammonium sulfate aqueous solution with a mass concentration of 7-8%, wherein the mass ratio of the hydrogen peroxide aqueous solution, the ferrous sulfate aqueous solution, and the ferrous ammonium sulfate aqueous solution is 10-20:1-2:

1.

5. A method for preparing a water-blocking, air-barrier, and waterproof paper bag adhesive, characterized in that: The waterproof paper bag adhesive comprises a waterproof component and a heat-sealing component, and the preparation method of the waterproof component is as follows: Step 1: Mix ethylene, vinyl acetate, styrene, butyl acrylate, acrylic acid, isooctyl acrylate, polysiloxane, styrene-butadiene latex, metal salt, film-forming agent, emulsifier, buffer, and deionized water, and stir at room temperature to form a pre-emulsion. Step 2: After heating the pre-emulsion to 80-100℃ in a nitrogen atmosphere, the initiator is added dropwise to the pre-emulsion while stirring. After the addition is complete, the temperature is maintained for 2-3 hours, and finally the temperature is lowered to obtain the waterproof component. In step one, the waterproof component comprises the following raw materials in parts by weight: The metal salt is at least one of chromium nitrate, aluminum nitrate, and aluminum chloride; The film-forming agent is at least one of maleic acid, tartaric acid, and acetic acid; the heat-sealing component includes an acrylic emulsion.

6. The method for preparing a water-blocking, air-barrier, and waterproof paper bag adhesive according to claim 5, characterized in that: The initiator is added at a rate of 1-2 kg / min.

7. The method for preparing a water-blocking, air-barrier, and waterproof paper bag adhesive according to claim 5, characterized in that: In step one, the stirring speed is 500-800 r / min, and the stirring time is 0.5-1 h.

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