Moisture-proof and mildew-proof corrugated paper and preparation method thereof

Abstract

The invention relates to the field of corrugated paper preparation, in particular to moisture-proof and mildew-proof corrugated paper and a preparation method thereof. The composite board comprises a board core located in the center and paper layers located on the two sides of the board core. A moisture-proof and mildew-proof bonding layer is arranged between the board core and the paper layer; a moisture-proof and mildew-proof protective layer is arranged on the outer side of the The moisture-proof and mildew-proof bonding layer is obtained by coating a bonding agent; the adhesive comprises activated carbon powder, kaolin, water, hydrogen peroxide, potassium permanganate, starch, caustic soda, borax, a defoaming agent and a special drying catalyst; the moisture-proof and mildew-proof protective layer is obtained by coating a protective agent; the protective agent is prepared from activated carbon powder, kaolin, paraffin, dimethyl silicone oil, absolute ethyl alcohol, tetrabutyl titanate, an emulsifier OP-10, polysorbate-80, an acetic acid solution, styrene-acrylic emulsion, a film-forming agent, a dispersing agent and a preservative. On the basis of the original performance, multi-layer moisture-proof and mildew-proof effects are further achieved, the quality of the corrugated paper is improved, objects contained in the corrugated paper are protected, the strength of the corrugated paper is enhanced, and the service life of a carton is prolonged.

Description

Technical Field

[0001] The invention relates to the field of corrugated paper preparation, and in particular to moisture-proof and mildew-proof corrugated paper and a preparation method thereof. Background Art

[0002] Corrugated paper is mainly composed of face paper, corrugated core paper and lining paper, and has the advantages of light weight, environmental protection, low cost and high strength. However, the surface of corrugated paper is easy to absorb water, and its fiber structure makes it easy to get damp. Once corrugated paper gets damp, its various properties will be greatly reduced, such as reduced strength and softening, thus affecting its use effect.

[0003] 1. Waterproofing requirements for corrugated paper

[0004] Protecting the contents: Corrugated paper is often used to package various items, such as electronic products, food, etc. These items are often sensitive to moisture and may be damaged or deteriorate once exposed to moisture. Therefore, corrugated paper needs to have a certain waterproof property to protect the contents from moisture erosion.

[0005] Maintaining carton strength: When corrugated paper is exposed to moisture, its strength will drop significantly, which may cause the carton to break and fail to effectively protect the contents. Waterproofing can enhance the strength of corrugated paper, allowing it to maintain stable performance in various environments.

[0006] 2. Anti-mildew requirements for corrugated paper

[0007] Prevent mold growth: mold growth requires moisture, temperature, nutrients and other conditions. Corrugated paper can easily become a breeding ground for mold in a humid environment, causing the carton to mold and deteriorate. Anti-mold treatment can effectively prevent the growth of mold on corrugated paper and extend the service life of the carton.

[0008] Protect the quality of the contents: The growth of mold not only affects the appearance and performance of the carton, but may also contaminate the contents, resulting in a decrease in quality. Anti-mold treatment can ensure that the contents are not damaged by mold during storage and transportation, maintaining their original quality.

[0009] Therefore, there is an urgent need for moisture-proof and mildew-proof corrugated paper and a preparation method thereof to meet the demand of the packaging market for moisture-proof and mildew-proof corrugated paper. Summary of the invention

[0010] In view of the problems existing in the background technology, a moisture-proof and mildew-proof corrugated paper and a preparation method thereof are proposed, which further improves the quality of the corrugated paper, protects the contents, enhances the strength of the corrugated paper, and prolongs the service life of the carton by further multi-layer moisture-proof and mildew-proofing on the basis of the original performance.

[0011] The invention provides a moisture-proof and mildew-proof corrugated paper, comprising a board core located in the center and paper layers located on both sides of the board core; a moisture-proof and mildew-proof adhesive layer is arranged between the board core and the paper layer; a moisture-proof and mildew-proof protective layer is arranged on the outer side of the paper layer; the moisture-proof and mildew-proof adhesive layer is obtained by coating an adhesive; the adhesive comprises activated carbon powder, kaolin, water, hydrogen peroxide, potassium permanganate, starch, caustic soda, borax, a defoaming agent and a special drying catalyst; the moisture-proof and mildew-proof protective layer is obtained by coating a protective agent; the protective agent comprises activated carbon powder, kaolin, paraffin, dimethyl silicone oil, anhydrous ethanol, tetrabutyl titanate, emulsifier OP-10, polysorbate-80, acetic acid solution, styrene-acrylic emulsion, a film-forming agent, a dispersant and a preservative.

[0012] Preferably, according to the ingredient ratio, each part of the adhesive includes 200-300 parts of activated carbon powder, 100-200 parts of kaolin, 1000-1500 parts of water, 5-25 parts of hydrogen peroxide, 2.5-15 parts of potassium permanganate, 170-350 parts of starch, 20-29 parts of caustic soda, 7-7.5 parts of borax, 10-15 parts of defoaming agent and 10-15 parts of drying catalyst.

[0013] Preferably, the defoamer is selected from silicone defoamer, polyether defoamer or mineral oil defoamer.

[0014] Preferably, the drying catalyst is selected from silica gel desiccant, montmorillonite desiccant, calcium chloride desiccant or molecular sieve desiccant.

[0015] Preferably, the preparation method of the adhesive is as follows: heating water to 40°C, adding starch and stirring evenly, then heating to 90-100°C, and continuously stirring to ensure that the starch is completely dissolved and gelatinized; during or after the gelatinization of the starch, gradually adding a caustic soda solution to adjust the pH value of the adhesive; after the starch is gelatinized and the caustic soda is added, adding hydrogen peroxide; after the oxidation reaction is completed, adding borax; adding activated carbon powder, kaolin, a defoaming agent and a special drying catalyst; and obtaining the prepared adhesive.

[0016] Preferably, according to the ingredient ratio, each part of the protective agent includes 40-50 parts of activated carbon powder, 40-50 parts of kaolin, 150-200 parts of paraffin, 10-15 parts of dimethyl silicone oil, 3-5 parts of anhydrous ethanol, 0.5-1.5 parts of tetrabutyl titanate, 5-10 parts of emulsifier OP-10, 0.5-1 parts of polysorbate 80, 40-60 parts of acetic acid solution, 50-150 parts of styrene acrylic emulsion, 2-4 parts of film-forming agent, 5-10 parts of dispersant and 0.5-1 parts of preservative.

[0017] Preferably, the film-forming agent is selected from polyacrylamide, polyvinyl alcohol, sodium carboxymethyl cellulose, water-based polyurethane or acrylic resin.

[0018] Preferably, the dispersant is triethanolamine; and the preservative is kason.

[0019] Preferably, the preparation method of the protective agent is as follows: first, paraffin is added to a reaction kettle and heated to melt at 70-80°C, and then dimethyl silicone oil, anhydrous ethanol, tetrabutyl titanate, emulsifier OP-10 and polysorbate-80 are added in sequence, mixed and stirred evenly to obtain a composite emulsified paraffin; the composite emulsified paraffin and acetic acid solution are added to the reaction kettle together and stirred evenly at 80-90°C, and the pH is adjusted to 6-7 after cooling; activated carbon powder, kaolin, styrene-acrylic emulsion, film-forming agent, dispersant and preservative are added, and stirred evenly to obtain a protective agent.

[0020] The present invention further proposes a method for preparing moisture-proof and mildew-proof corrugated paper. The moisture-proof and mildew-proof corrugated paper according to claim 1 is prepared as follows: a group of board cores and two groups of paper layers are taken; adhesive is applied on both sides of the board core to form a moisture-proof and mildew-proof adhesive layer; the inner sides of the two groups of paper layers are respectively pressed on the moisture-proof and mildew-proof adhesive layer; a protective agent is applied on the outer sides of the two groups of paper layers to form a moisture-proof and mildew-proof protective layer; the moisture-proof and mildew-proof corrugated paper is obtained after drying and cooling; the coating amount of the adhesive and the protective agent is 15-20g / m 2 .

[0021] Compared with the prior art, the present invention has the following beneficial technical effects: a moisture-proof and mildew-proof adhesive layer is arranged between the board core and the paper layer; a moisture-proof and mildew-proof protective layer is arranged on the outer side of the paper layer, and activated carbon and kaolin are added to both the moisture-proof and mildew-proof adhesive layer and the moisture-proof and mildew-proof protective layer, thereby further achieving multi-layer moisture-proof and mildew-proof properties on the basis of the original performance, improving the quality of corrugated paper, protecting the contents, enhancing the strength of corrugated paper, and extending the service life of the carton. DETAILED DESCRIPTION

[0022] The invention provides a moisture-proof and mildew-proof corrugated paper, comprising a board core located in the center and paper layers located on both sides of the board core; a moisture-proof and mildew-proof adhesive layer is arranged between the board core and the paper layer; a moisture-proof and mildew-proof protective layer is arranged on the outer side of the paper layer; the moisture-proof and mildew-proof adhesive layer is obtained by coating an adhesive; the adhesive comprises activated carbon powder, kaolin, water, hydrogen peroxide, potassium permanganate, starch, caustic soda, borax, a defoaming agent and a special drying catalyst; the moisture-proof and mildew-proof protective layer is obtained by coating a protective agent; the protective agent comprises activated carbon powder, kaolin, paraffin, dimethyl silicone oil, anhydrous ethanol, tetrabutyl titanate, emulsifier OP-10, polysorbate-80, acetic acid solution, styrene-acrylic emulsion, a film-forming agent, a dispersant and a preservative.

[0023] Embodiment 1

[0024] The invention provides a moisture-proof and mildew-proof corrugated paper, comprising a board core located in the center and paper layers located on both sides of the board core; a moisture-proof and mildew-proof adhesive layer is arranged between the board core and the paper layer; a moisture-proof and mildew-proof protective layer is arranged on the outer side of the paper layer; and the moisture-proof and mildew-proof adhesive layer is obtained by coating an adhesive.

[0025] It should be further explained that, according to the ingredient ratio, each part of the adhesive includes 200 parts of activated carbon powder, 100 parts of kaolin, 1000 parts of water, 5 parts of hydrogen peroxide, 2.5 parts of potassium permanganate, 170 parts of starch, 20 parts of caustic soda, 7 parts of borax, 10 parts of defoaming agent and 10 parts of drying catalyst.

[0026] It should be further explained that the defoaming agent is selected from silicone defoaming agent, polyether defoaming agent or mineral oil defoaming agent.

[0027] It should be further explained that the drying catalyst is selected from silica gel desiccant, montmorillonite desiccant, calcium chloride desiccant or molecular sieve desiccant.

[0028] It should be further explained that the preparation method of the adhesive is as follows: heat water to 40°C, add starch and stir evenly, then heat to 90-100°C, and continue stirring to ensure that the starch is completely dissolved and gelatinized; during or after starch gelatinization, gradually add caustic soda solution to adjust the pH value of the adhesive; the amount of caustic soda added should be determined according to the type and amount of starch and the required adhesive properties; after the starch is gelatinized and caustic soda is added, add hydrogen peroxide; the oxidant can promote the oxidation reaction of starch, increase the viscosity and film-forming ability of the adhesive; after the oxidation reaction is completed, add borax; the cross-linking agent can form a cross-linking structure with the starch molecules to enhance the initial viscosity and drying speed of the adhesive; add activated carbon powder, kaolin, defoaming agent and special drying catalyst; the defoaming agent can eliminate foam in the adhesive to ensure the uniformity and stability of the adhesive; and obtain the prepared adhesive.

[0029] It should be further explained that, according to the ingredient ratio, each part of the protective agent includes 40-50 parts of activated carbon powder, 40 parts of kaolin, 150 parts of paraffin, 10 parts of dimethyl silicone oil, 3 parts of anhydrous ethanol, 0.5 parts of tetrabutyl titanate, 5 parts of emulsifier OP-10, 0.5 parts of polysorbate 80, 40 parts of acetic acid solution, 50 parts of styrene acrylic emulsion, 2 parts of film-forming agent, 5 parts of dispersant and 0.5 parts of preservative.

[0030] It should be further explained that the film-forming agent is selected from polyacrylamide, polyvinyl alcohol, sodium carboxymethyl cellulose, water-based polyurethane or acrylic resin.

[0031] It should be further explained that triethanolamine is selected as the dispersant and kason is selected as the preservative.

[0032] It should be further explained that the preparation method of the protective agent is as follows: first add paraffin into a reactor and heat to melt at 70-80°C, then add dimethyl silicone oil, anhydrous ethanol, tetrabutyl titanate, emulsifier OP-10 and polysorbate-80 in sequence, mix and stir evenly to obtain a composite emulsified paraffin; add the composite emulsified paraffin and acetic acid solution into the reactor together and stir evenly at 80-90°C, and adjust the pH to 6-7 after cooling; add activated carbon powder, kaolin, styrene-acrylic emulsion, film-forming agent, dispersant and preservative, stir evenly to obtain a protective agent.

[0033] Embodiment 2

[0034] The invention provides a moisture-proof and mildew-proof corrugated paper, comprising a board core located in the center and paper layers located on both sides of the board core; a moisture-proof and mildew-proof adhesive layer is arranged between the board core and the paper layer; a moisture-proof and mildew-proof protective layer is arranged on the outer side of the paper layer; and the moisture-proof and mildew-proof adhesive layer is obtained by coating an adhesive.

[0035] It should be further explained that, according to the ingredient ratio, each part of the adhesive includes 300 parts of activated carbon powder, 200 parts of kaolin, 1500 parts of water, 25 parts of hydrogen peroxide, 15 parts of potassium permanganate, 350 parts of starch, 29 parts of caustic soda, 7.5 parts of borax, 15 parts of defoaming agent and 15 parts of drying catalyst.

[0036] It should be further explained that the defoaming agent is selected from silicone defoaming agent, polyether defoaming agent or mineral oil defoaming agent.

[0037] It should be further explained that the drying catalyst is selected from silica gel desiccant, montmorillonite desiccant, calcium chloride desiccant or molecular sieve desiccant.

[0038] It should be further explained that the preparation method of the adhesive is as follows: heat water to 40°C, add starch and stir evenly, then heat to 90-100°C, and continue stirring to ensure that the starch is completely dissolved and gelatinized; during or after starch gelatinization, gradually add caustic soda solution to adjust the pH value of the adhesive; the amount of caustic soda added should be determined according to the type and amount of starch and the required adhesive properties; after the starch is gelatinized and caustic soda is added, add hydrogen peroxide; the oxidant can promote the oxidation reaction of starch, increase the viscosity and film-forming ability of the adhesive; after the oxidation reaction is completed, add borax; the cross-linking agent can form a cross-linking structure with the starch molecules to enhance the initial viscosity and drying speed of the adhesive; add activated carbon powder, kaolin, defoaming agent and special drying catalyst; the defoaming agent can eliminate foam in the adhesive to ensure the uniformity and stability of the adhesive; and obtain the prepared adhesive.

[0039] It should be further explained that, according to the ingredient ratio, each part of the protective agent includes 40-50 parts of activated carbon powder, 50 parts of kaolin, 200 parts of paraffin, 15 parts of dimethyl silicone oil, 5 parts of anhydrous ethanol, 1.5 parts of tetrabutyl titanate, 10 parts of emulsifier OP-10, 1 part of polysorbate 80, 60 parts of acetic acid solution, 150 parts of styrene acrylic emulsion, 4 parts of film-forming agent, 10 parts of dispersant and 1 part of preservative.

[0040] It should be further explained that the film-forming agent is selected from polyacrylamide, polyvinyl alcohol, sodium carboxymethyl cellulose, water-based polyurethane or acrylic resin.

[0041] It should be further explained that triethanolamine is selected as the dispersant and kason is selected as the preservative.

[0042] It should be further explained that the preparation method of the protective agent is as follows: first add paraffin into a reactor and heat to melt at 70-80°C, then add dimethyl silicone oil, anhydrous ethanol, tetrabutyl titanate, emulsifier OP-10 and polysorbate-80 in sequence, mix and stir evenly to obtain a composite emulsified paraffin; add the composite emulsified paraffin and acetic acid solution into the reactor together and stir evenly at 80-90°C, and adjust the pH to 6-7 after cooling; add activated carbon powder, kaolin, styrene-acrylic emulsion, film-forming agent, dispersant and preservative, stir evenly to obtain a protective agent.

[0043] Embodiment 3

[0044] The invention provides a moisture-proof and mildew-proof corrugated paper, comprising a board core located in the center and paper layers located on both sides of the board core; a moisture-proof and mildew-proof adhesive layer is arranged between the board core and the paper layer; a moisture-proof and mildew-proof protective layer is arranged on the outer side of the paper layer; and the moisture-proof and mildew-proof adhesive layer is obtained by coating an adhesive.

[0045] It should be further explained that, according to the ingredient ratio, each part of the adhesive includes 200-300 parts of activated carbon powder, 150 parts of kaolin, 1200 parts of water, 15 parts of hydrogen peroxide, 8 parts of potassium permanganate, 300 parts of starch, 24 parts of caustic soda, 7.3 parts of borax, 12 parts of defoaming agent and 12 parts of drying catalyst.

[0046] It should be further explained that the defoaming agent is selected from silicone defoaming agent, polyether defoaming agent or mineral oil defoaming agent.

[0047] It should be further explained that the drying catalyst is selected from silica gel desiccant, montmorillonite desiccant, calcium chloride desiccant or molecular sieve desiccant.

[0048] It should be further explained that the preparation method of the adhesive is as follows: heat water to 40°C, add starch and stir evenly, then heat to 90-100°C, and continue stirring to ensure that the starch is completely dissolved and gelatinized; during or after starch gelatinization, gradually add caustic soda solution to adjust the pH value of the adhesive; the amount of caustic soda added should be determined according to the type and amount of starch and the required adhesive properties; after the starch is gelatinized and caustic soda is added, add hydrogen peroxide; the oxidant can promote the oxidation reaction of starch, increase the viscosity and film-forming ability of the adhesive; after the oxidation reaction is completed, add borax; the cross-linking agent can form a cross-linking structure with the starch molecules to enhance the initial viscosity and drying speed of the adhesive; add activated carbon powder, kaolin, defoaming agent and special drying catalyst; the defoaming agent can eliminate foam in the adhesive to ensure the uniformity and stability of the adhesive; and obtain the prepared adhesive.

[0049] It should be further explained that, according to the ingredient ratio, each part of the protective agent includes 45 parts of activated carbon powder, 45 parts of kaolin, 160 parts of paraffin, 12 parts of dimethyl silicone oil, 4 parts of anhydrous ethanol, 1 part of tetrabutyl titanate, 7 parts of emulsifier OP-10, 0.7 parts of polysorbate 80, 50 parts of acetic acid solution, 100 parts of styrene acrylic emulsion, 3 parts of film-forming agent, 7 parts of dispersant and 0.7 parts of preservative.

[0050] It should be further explained that the film-forming agent is selected from polyacrylamide, polyvinyl alcohol, sodium carboxymethyl cellulose, water-based polyurethane or acrylic resin.

[0051] It should be further explained that triethanolamine is selected as the dispersant and kason is selected as the preservative.

[0052] It should be further explained that the preparation method of the protective agent is as follows: first add paraffin into a reactor and heat to melt at 70-80°C, then add dimethyl silicone oil, anhydrous ethanol, tetrabutyl titanate, emulsifier OP-10 and polysorbate-80 in sequence, mix and stir evenly to obtain a composite emulsified paraffin; add the composite emulsified paraffin and acetic acid solution into the reactor together and stir evenly at 80-90°C, and adjust the pH to 6-7 after cooling; add activated carbon powder, kaolin, styrene-acrylic emulsion, film-forming agent, dispersant and preservative, stir evenly to obtain a protective agent.

[0053] Embodiment 4

[0054] Based on the moisture-proof and mildew-proof corrugated paper in Examples 1, 2 and 3, this embodiment proposes a method for preparing moisture-proof and mildew-proof corrugated paper, and the preparation method is as follows: take a group of board cores and two groups of paper layers; apply adhesive on both sides of the board core to form a moisture-proof and mildew-proof adhesive layer; press the inner sides of the two groups of paper layers on the moisture-proof and mildew-proof adhesive layer respectively; apply protective agent on the outer sides of the two groups of paper layers to form a moisture-proof and mildew-proof protective layer; dry and cool to obtain moisture-proof and mildew-proof corrugated paper; the coating amount of the adhesive and the protective agent is 15-20g / m2 .

[0055] The corrugated paper prepared by this method has a gram weight of 120g-130 / m 2 The ring pressure index, moisture resistance test, anti-aging performance test and other performance tests were carried out, and the test results are shown in the following table:

[0056]

[0057] Table 1

[0058] Take the corrugated paper prepared in Examples 1, 2 and 3, spray water mist on the surface of the corrugated paper once every 3 hours, and the amount of water sprayed each time is controlled at 12g / m 2 , spray 3 times and then stand for 20 hours to test the ring pressure index of the corrugated paper. The ring pressure index determination is carried out in accordance with GB / T2679.8-2016 "Determination of Ring Compression Strength of Paper and Paperboard". The test method for the mildew resistance of corrugated paper is as follows: spray a mold spore suspension on the surface of the corrugated paper, and then place it in an environment most suitable for mold growth. After a period of cultivation, observe the degree of mold growth to judge the mildew resistance effect. Finally, it can be seen from Table 1 that the moisture-proof and mildew-proof corrugated paper prepared by the present invention has good moisture-proof and mildew-proof performance.

[0059] Activated carbon is a porous carbon-containing substance with a large number of microporous structures. These microporous structures can absorb moisture molecules in the surrounding air, thereby effectively reducing the humidity in the air. This characteristic makes activated carbon excellent in moisture resistance and can effectively prevent items from getting damp and moldy due to excessive humidity. In addition to physical adsorption, activated carbon can also react chemically with certain substances through the functional groups on its surface, thereby achieving adsorption of these substances. This chemical adsorption effect is particularly important in mold prevention, because activated carbon can adsorb and inhibit the reproduction of microorganisms such as mold spores in the air, thereby reducing the content of pathogens in indoor air.

[0060] Kaolin has good hygroscopicity and can absorb moisture from the air, thus keeping the environment relatively dry. This hygroscopicity helps reduce the impact of a humid environment on items and prevents problems such as mold and deterioration caused by moisture. Kaolin can absorb and fix excess moisture, thereby regulating the humidity of the environment to a certain extent. This ability to regulate humidity helps maintain a relatively stable indoor environment and reduce the possibility of mold growth. The mineral components in kaolin can destroy the cell walls of mold, thereby inhibiting the growth of mold. In addition, kaolin can also absorb and fix the nutrients needed by mold, further reducing the possibility of mold growth. The pH value of kaolin is neutral or alkaline, which can change the pH of the environment and prevent mold from growing. This ability to change the pH of the environment helps create an environment that is not conducive to mold growth.

[0061] The present invention adds activated carbon and kaolin to both the moisture-proof and mildew-proof adhesive layer and the moisture-proof and mildew-proof protective layer, further achieving multi-layer moisture-proof and mildew-proof properties on the basis of the original properties, thereby improving the quality of corrugated paper, protecting the contents, enhancing the strength of the corrugated paper, and extending the service life of the carton.

[0062] The above describes the embodiments of the present invention in detail, but the present invention is not limited thereto. Various changes can be made within the knowledge scope of those skilled in the art without departing from the spirit of the present invention.

Claims

1. A moisture-proof and mildew-proof corrugated paper, characterized in that: It includes a board core located in the center and paper layers located on both sides of the board core; A moisture-proof and mildew-proof adhesive layer is arranged between the board core and the paper layer; a moisture-proof and mildew-proof protective layer is arranged on the outer side of the paper layer; The moisture-proof and mildew-proof adhesive layer is obtained by coating an adhesive; the adhesive comprises activated carbon powder, kaolin, water, hydrogen peroxide, potassium permanganate, starch, caustic soda, borax, a defoamer and a special drying catalyst; The moisture-proof and mildew-proof protective layer is obtained by coating a protective agent; the protective agent includes activated carbon powder, kaolin, paraffin, dimethyl silicone oil, anhydrous ethanol, tetrabutyl titanate, emulsifier OP-10, polysorbate-80, acetic acid solution, styrene acrylic emulsion, film-forming agent, dispersant and preservative.

2. The moisture-proof and mildew-proof corrugated paper according to claim 1, characterized in that: According to the ingredient ratio, each part of the adhesive includes 200-300 parts of activated carbon powder, 100-200 parts of kaolin, 1000-1500 parts of water, 5-25 parts of hydrogen peroxide, 2.5-15 parts of potassium permanganate, 170-350 parts of starch, 20-29 parts of caustic soda, 7-7.5 parts of borax, 10-15 parts of defoaming agent and 10-15 parts of drying catalyst.

3. The moisture-proof and mildew-proof corrugated paper according to claim 2, characterized in that: The defoaming agent can be silicone defoaming agent, polyether defoaming agent or mineral oil defoaming agent.

4. The moisture-proof and mildew-proof corrugated paper according to claim 2, characterized in that: The catalyst can be dried using silica gel desiccant, montmorillonite desiccant, calcium chloride desiccant or molecular sieve desiccant.

5. The moisture-proof and mildew-proof corrugated paper according to claim 1, characterized in that: The preparation method of the adhesive is as follows: heating water to 40°C, adding starch and stirring evenly, then heating to 90-100°C, and continuously stirring to ensure that the starch is completely dissolved and gelatinized; during or after the gelatinization of the starch, gradually adding a caustic soda solution to adjust the pH value of the adhesive; after the starch is gelatinized and the caustic soda is added, adding hydrogen peroxide; after the oxidation reaction is completed, adding borax; adding activated carbon powder, kaolin, a defoaming agent and a special drying catalyst; and obtaining the prepared adhesive.

6. The moisture-proof and mildew-proof corrugated paper according to claim 1, characterized in that: According to the ingredient ratio, each portion of the protective agent includes 40-50 portions of activated carbon powder, 40-50 portions of kaolin, 150-200 portions of paraffin, 10-15 portions of dimethyl silicone oil, 3-5 portions of anhydrous ethanol, 0.5-1.5 portions of tetrabutyl titanate, 5-10 portions of emulsifier OP-10, 0.5-1 portions of polysorbate 80, 40-60 portions of acetic acid solution, 50-150 portions of styrene-acrylic emulsion, 2-4 portions of film-forming agent, 5-10 portions of dispersant and 0.5-1 portions of preservative.

7. The moisture-proof and mildew-proof corrugated paper according to claim 6, characterized in that: The film-forming agent can be polyacrylamide, polyvinyl alcohol, sodium carboxymethyl cellulose, water-based polyurethane or acrylic resin.

8. The moisture-proof and mildew-proof corrugated paper according to claim 6, characterized in that: The dispersant is triethanolamine; the preservative is kason.

9. The moisture-proof and mildew-proof corrugated paper according to claim 6, characterized in that: The preparation method of the protective agent is as follows: firstly, paraffin is added into a reaction kettle and heated to melt at 70-80°C, then dimethyl silicone oil, anhydrous ethanol, tetrabutyl titanate, emulsifier OP-10 and polysorbate-80 are added in sequence, mixed and stirred evenly to obtain a composite emulsified paraffin; the composite emulsified paraffin and acetic acid solution are added into a reaction kettle together and stirred evenly at 80-90°C, and the pH is adjusted to 6-7 after cooling; activated carbon powder, kaolin, styrene-acrylic emulsion, film-forming agent, dispersant and preservative are added, stirred evenly to obtain a protective agent.

10. A method for preparing moisture-proof and mildew-proof corrugated paper, characterized in that: The moisture-proof and mildew-proof corrugated paper of claim 1 is prepared by the following method: taking a group of board cores and two groups of paper layers; applying adhesive on both sides of the board core to form a moisture-proof and mildew-proof adhesive layer; pressing the inner sides of the two groups of paper layers onto the moisture-proof and mildew-proof adhesive layer respectively; applying protective agent on the outer sides of the two groups of paper layers to form a moisture-proof and mildew-proof protective layer; drying and cooling to obtain the moisture-proof and mildew-proof corrugated paper; The coating amount of adhesive and protective agent is 15-20g / m 2 .

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