Water-resistant corrugated paper as well as preparation process and application thereof

Abstract

The invention belongs to the technical field of corrugated paper, and particularly relates to water-resistant corrugated paper as well as a preparation process and application thereof. The water-resistant corrugated paper sequentially comprises surface paper, a corrugated board layer and inner layer paper from outside to inside, the corrugated board layer is obtained by soaking a corrugated board in water-resistant reinforcing liquid and then drying the corrugated board, and the corrugated board layer adheres to the surface of the surface paper and the surface of the inner layer paper through an adhesive. The water-resistant reinforcing liquid is prepared from the following components in percentage by weight: 25 to 30 percent of organic silicon modified acrylic resin, 8 to 12 percent of water-based fluorocarbon resin, 6 to 10 percent of water-based epoxy resin, 12 to 17 percent of modified silica sol, 6 to 10 percent of water-based tackifying emulsion, 3 to 6 percent of carbodiimide hydrolysis-resistant agent, 2 to 7 percent of modified zinc oxide whisker, 6 to 8 percent of water-based polyurethane cross-linking agent and the balance of water. The corrugated paper prepared by the invention is good in water resistance, particularly strong in damp and hot environment resistance, and can be used for e-commerce logistics packaging.

Description

Technical Field

[0001] The present invention belongs to the technical field of corrugated paper, and particularly relates to a water-resistant corrugated paper, its preparation process and application. Background Art

[0002] Corrugated paper is a plate-shaped material formed by bonding a face paper and a corrugated core paper. Its core structure is a wavy corrugated layer, which has the characteristics of light weight, high compressive strength, and excellent buffering performance. It is widely used in the fields of food, electronic products, household appliances, express logistics, etc. In recent years, with the explosive growth of e-commerce logistics, the demand for corrugated paper has been continuously rising.

[0003] The main component of traditional corrugated paper is cellulose, which is easy to absorb moisture and soften, resulting in a decrease in strength or even the collapse of the structure. In daily use, water resistance has become a key performance requirement. Especially in a low-temperature and high-humidity environment, ordinary corrugated paper is easily eroded by condensed water, and water resistance treatment is required to maintain the integrity of the packaging. In humid climate regions such as Southeast Asia and South China, corrugated cardboard boxes need to resist rainwater and air humidity for a long time.

[0004] In the prior art, the methods for improving the waterproof property of corrugated paper mainly include surface coating, adding waterproof agents, and modification treatment, etc. Although these methods can improve the waterproof performance of corrugated paper to a certain extent, they each have obvious defects and limitations. The methods for improving the waterproof property of corrugated paper in the prior art mainly include the following: 1. Surface coating and laminating technology: Hydrophobic coating: Coating low surface energy substances (such as polylactic acid, polyolefin, paraffin, etc.) on the surface of corrugated paper to form a hydrophobic surface similar to that of a lotus leaf, so that water droplets roll off. Laminating process: Using polyethylene (PE), polypropylene (PP), or polyvinyl chloride (PVC) film to cover the surface of the cardboard to form a physical barrier layer. However, the waterproof time of the hydrophobic coating is short (only able to prevent splashing water for a short time) and cannot cope with long-term immersion. The laminating materials (such as PE, PVC) are not recyclable, have poor environmental friendliness, and are prone to softening or deformation at high temperatures. The long-term stability and industrial production feasibility of the nano-coating still need to be verified. 2. Pulp modification technology: Heavy sizing: Adding water-resistant auxiliaries (such as urea-formaldehyde resin, melamine formaldehyde resin) to the starch paste during the pulping stage to improve the hydrophobicity of fibers. Adding water-resistant agents: Adding high molecular polymers (such as cross-linking agents) to the corrugated sizing to enhance the waterproof property of the bonding line. However, the sizing process has a high cost, and excessive addition may cause the corrugated cardboard to delaminate, affecting the structural strength. The water-resistant agent may reduce the flexibility of the paper, resulting in embrittlement problems. 3. Structural design and filling technology: Multi-layer composite structure: Embedding a waterproof layer (such as polyethylene film, acrylic coating) or filling moisture-proof materials (such as calcium chloride, EPE) in the corrugated cardboard to form a physical barrier. Honeycomb layer and buffer layer: Enhancing the compressive resistance and water isolation ability through honeycomb structure or EPE filling. The multi-layer structure leads to complex production processes and increased costs (such as requiring additional lamination equipment). 4. Special processes and materials: Aluminum-plated film composite: Composite aluminum-plated polyvinyl chloride film with kraft paper, which has both waterproof and electromagnetic shielding functions. However, the cost of the aluminum-plated film is extremely high, and the composite material is difficult to separate and recycle. In addition, in the prior art, adding alkyl ketene dimer (AKD) or rosin size during the pulping stage to improve the hydrophobicity of fibers, such methods have good environmental friendliness, but may cause the paper to embrittle and the compressive strength to decrease by 10%-15%.

[0005] Therefore, there is an urgent need for a water-resistant corrugated paper and its preparation process and application. Summary of the Invention

[0006] The object of the present invention is to provide a water-resistant corrugated paper and its preparation process and application.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A water-resistant corrugated paper, which sequentially includes a face paper, a corrugated cardboard layer, and an inner layer paper from outside to inside. The corrugated cardboard layer is obtained by soaking the corrugated cardboard in a water-resistant strengthening liquid and then drying it. The corrugated cardboard layer is adhered to the surfaces of the face paper and the inner layer paper respectively through an adhesive;

[0009] The water-resistant enhancing liquid comprises the following components in percentage by weight: 25-30% of organosilicon-modified acrylic resin, 8-12% of waterborne fluorocarbon resin, 6-10% of waterborne epoxy resin, 12-17% of modified silica sol, 6-10% of waterborne tackifying emulsion, 3-6% of carbodiimide anti-hydrolysis agent, 2-7% of modified zinc oxide whiskers, 6-8% of waterborne polyurethane crosslinking agent, and the balance is water.

[0010] Furthermore, the organosilicon-modified acrylic resin has a viscosity of 3500-4000 mPa·s and a solid content of 38-42 wt%. Model J-611.

[0011] The waterborne fluorocarbon resin, model HT-104FW.

[0012] The waterborne tackifying emulsion, model DERMULSENEHBR509.

[0013] The waterborne epoxy resin, model NPEW-261W55.

[0014] In the present invention, by compounding the organosilicon-modified acrylic resin, the waterborne fluorocarbon resin and the waterborne epoxy resin, the three play a synergistic effect, and the water absorption rate of the corrugated paper can be reduced.

[0015] The carbodiimide anti-hydrolysis agent, model anti-hydrolysis agent AQ-AHA101.

[0016] The zinc oxide whiskers have a diameter of 0.5-5 μm and a length of 10-50 μm.

[0017] Furthermore, the modified silica sol comprises modified silica sol A, modified silica sol B and modified silica sol C; wherein, the particle size of modified silica sol A is 6-9 nm, model MA7-30; the particle size of modified silica sol B is 10-15 nm, model M12-40; the particle size of modified silica sol C is 4-6 nm, model M5-15.

[0018] Furthermore, the weight ratio of modified silica sol A, modified silica sol B and modified silica sol C is 1:(1.2-1.5):(0.5-0.7).

[0019] In the present invention, by compounding the modified silica sol with different particle sizes, the moisture-proof effect of the corrugated paper can be improved. The surface structure of the modified silica sol is organic carbon hydroxyl group (C-OH), and it has good compatibility with the resin system of the present invention.

[0020] The preparation method of the modified zinc oxide whiskers comprises the following steps:

[0021] (1) Add silane coupling agent KH570 to the ethanol aqueous solution, stir for 50 - 60 min, then continue to add zinc oxide whiskers, place it in a constant temperature water bath at 40 - 45 °C for ultrasonic stirring, take out, filter by suction, and dry to obtain pre-modified zinc oxide whiskers;

[0022] (2) Heat γ-aminopropyltrimethoxysilane to 35 °C, slowly add 4-methylcyclohexyl isocyanate, reflux and react for 3 - 4 h, stop the reaction, and cool to room temperature to obtain modified silane;

[0023] (3) Mix isopropanol and modified silane, add pre-modified zinc oxide whiskers, heat to 70 - 75 °C and react for 3 - 4 h, take out, filter by suction, and dry to obtain modified zinc oxide whiskers.

[0024] Furthermore, the weight ratio of silane coupling agent KH570 to zinc oxide whiskers is (0.1 - 0.3):1.

[0025] Furthermore, the volume concentration of the ethanol aqueous solution is 50 - 60%. Furthermore, the weight ratio of γ-aminopropyltrimethoxysilane to 4-methylcyclohexyl isocyanate is 1:(0.92 - 0.97).

[0026] Furthermore, the weight ratio of modified silane to pre-modified zinc oxide whiskers is (0.1 - 0.2):1.

[0027] In the present invention, by modifying zinc oxide whiskers, the dispersibility of zinc oxide whiskers in the system is higher, and the strength retention rate of corrugated paper under humid and hot environments can be improved. By introducing cyclohexyl and urea groups onto zinc oxide whiskers, the compatibility between zinc oxide whiskers and resin substrates is improved.

[0028] The preparation method of the water-resistant reinforcing liquid includes the following steps: Mix the components of the water-resistant reinforcing liquid evenly to obtain the water-resistant reinforcing liquid.

[0029] The present invention also provides a preparation method of a water-resistant corrugated paper, including the following steps:

[0030] (1) Coat the reinforcing liquid on the surface of the corrugated paper layer, dry at 50 - 55 °C for 25 - 30 h, and the thickness of the reinforcing layer obtained after drying the reinforcing liquid is 2 - 4 μm to obtain a corrugated paperboard layer;

[0031] (2) Adhere the rigid corrugated paper layer to the surfaces of the face paper and the inner paper through an adhesive, and the adhesive is a surface sizing agent of model GBS-02 to obtain a high-strength new corrugated paperboard.

[0032] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0033] 1. By compounding organosilicon-modified acrylic resin, waterborne fluorocarbon resin and waterborne epoxy resin, the three play a synergistic role, which can reduce the water absorption rate of corrugated paper.

[0034] 2. By compounding modified silica sol with different particle sizes, the moisture-proof effect of corrugated paper can be improved.

[0035] 3. By modifying zinc oxide whiskers, the dispersion of zinc oxide whiskers in the system is higher, which can improve the strength retention rate of corrugated paper in a humid and hot environment. Detailed implementation manners

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] All raw materials used in the following embodiments of the present invention are commercially available products:

[0038] Adhesive: Guangzhou Tongda Chemical Engineering Co., Ltd., surface sizing agent, model GBS-02.

[0039] Corrugated board, Shijiazhuang Shengrunxuan Paper Products Co., Ltd., single-sided corrugated board, thickness 2 mm.

[0040] Waterborne polyurethane crosslinking agent, Shanghai Youen Chemical Co., Ltd., model UN-557.

[0041] Example 1

[0042] This example provides a water-resistant corrugated paper, which sequentially includes a face paper, a corrugated board layer and an inner layer paper from outside to inside. The corrugated board layer is obtained by soaking the corrugated board in a water-resistant strengthening liquid and then drying it. The corrugated board layer is adhered to the surfaces of the face paper and the inner layer paper respectively through an adhesive.

[0043] The water-resistant strengthening liquid includes the following components in weight percentage: 27% of organosilicon-modified acrylic resin, 10% of waterborne fluorocarbon resin, 8% of waterborne epoxy resin, 15% of modified silica sol, 9% of waterborne tackifying emulsion, 5% of carbodiimide anti-hydrolysis agent, 5% of modified zinc oxide whiskers, 7% of waterborne polyurethane crosslinking agent, and the balance is water. The preparation method of the water-resistant strengthening liquid includes the following steps: mixing the components of the water-resistant strengthening liquid evenly to obtain the water-resistant strengthening liquid.

[0044] Organosilicon-modified acrylic resin, viscosity 3500 - 4000 mPa·s, solid content 38 - 42 wt%. Jining Fangyu Chemical Co., Ltd., model J-611.

[0045] Waterborne fluorocarbon resin, model HT-104FW, Beijing Runbo Hengtong Technology Co., Ltd.

[0046] Waterborne tackifying emulsion, model DERMULSEN EHBR509, Dongguan Fantai New Materials Co., Ltd.

[0047] Waterborne epoxy resin, model NPEW-261W55. Shanghai Qunsheng Chemical Industry Co., Ltd.

[0048] Carbodiimide anti-hydrolysis agent, model anti-hydrolysis agent AQ-AHA101, Tianjin Aoluoji Chemical Technology Co., Ltd.

[0049] The modified silica sol includes modified silica sol A, modified silica sol B and modified silica sol C with a weight ratio of 1:1.3:0.6; among them, the particle size of modified silica sol A is 6-9nm, model MA7-30; the particle size of modified silica sol B is 10-15nm, model M12-40; the particle size of modified silica sol C is 4-6nm, model M5-15. Shandong Baite New Materials Co., Ltd.

[0050] The preparation method of modified zinc oxide whiskers includes the following steps:

[0051] (1) Add 0.2 parts by weight of silane coupling agent KH570 to 6 parts by weight of 55% ethanol aqueous solution by volume, stir for 55 min, continue to add 1 part by weight of zinc oxide whiskers, and place in a 42°C constant temperature water bath for ultrasonic stirring for 4.5 h, take out, filter by suction, and dry to obtain pre-modified zinc oxide whiskers;

[0052] (2) Heat 1 part by weight of γ-aminopropyltrimethoxysilane to 35°C, slowly add 0.95 parts by weight of 4-methylcyclohexyl isocyanate, reflux for 3.5 h, stop the reaction, and cool to room temperature to obtain modified silane;

[0053] (3) Mix 5 parts by weight of isopropanol and 0.1 part by weight of modified silane, add 1 part by weight of pre-modified zinc oxide whiskers, heat to 72°C and react for 3.5 h, take out, filter by suction, and dry to obtain modified zinc oxide whiskers.

[0054] Zinc oxide whiskers, diameter 0.5-5μm, length 10-50μm, Hubei Xinyuhong Biomedical Technology Co., Ltd.

[0055] A preparation method of water-resistant corrugated paper includes the following steps:

[0056] (1) Coat the reinforcing liquid on the surface of the corrugated paper layer, dry at 52°C for 27 h, and the thickness of the reinforcing layer obtained after drying the reinforcing liquid is 3μm to obtain a corrugated paperboard layer;

[0057] (2) Adhere the rigid corrugated paper layer to the surfaces of the face paper and the inner paper with an adhesive, and the adhesive is a surface sizing agent of model GBS-02 to obtain a high-strength new corrugated cardboard.

[0058] Example 2

[0059] This example provides a water-resistant corrugated paper, which sequentially includes a face paper, a corrugated cardboard layer, and an inner paper from outside to inside. The corrugated cardboard layer is obtained by soaking the corrugated cardboard in a water-resistant strengthening liquid and then drying it. The corrugated cardboard layer is adhered to the surfaces of the face paper and the inner paper with an adhesive respectively;

[0060] The water-resistant strengthening liquid includes the following components in weight percentages: 25% of organosilicon-modified acrylic resin, 12% of waterborne fluorocarbon resin, 6% of waterborne epoxy resin, 17% of modified silica sol, 6% of waterborne tackifying emulsion, 6% of carbodiimide anti-hydrolysis agent, 7% of modified zinc oxide whiskers, 6% of waterborne polyurethane crosslinking agent, and the balance is water. The preparation method of the water-resistant strengthening liquid includes the following steps: Mix the components of the water-resistant strengthening liquid evenly to obtain the water-resistant strengthening liquid.

[0061] The organosilicon-modified acrylic resin has a viscosity of 3500 - 4000 mpa.s and a solid content of 38 - 42 wt%. Jining Fangyu Chemical Co., Ltd., model J-611.

[0062] The waterborne fluorocarbon resin, model HT-104FW, Beijing Runbo Hengtong Technology Co., Ltd.

[0063] The waterborne tackifying emulsion, model DERMULSENEHBR509, Dongguan Fantai New Materials Co., Ltd.

[0064] The waterborne epoxy resin, model NPEW-261W55. Shanghai Qunsheng Chemical Co., Ltd.

[0065] The carbodiimide anti-hydrolysis agent, model anti-hydrolysis agent AQ-AHA101, Tianjin Aoluoqi Chemical Technology Co., Ltd.

[0066] The modified silica sol includes modified silica sol A, modified silica sol B, and modified silica sol C with a weight ratio of 1:1.2:0.5; among them, the particle size of the modified silica sol is 6 - 9 nm, model MA7-30; the particle size of the modified silica sol B is 10 - 15 nm, model M12-40; the particle size of the modified silica sol C is 4 - 6 nm, model M5-15. Shandong Baite New Materials Co., Ltd.

[0067] The preparation method of the modified zinc oxide whiskers includes the following steps:

[0068] (1) Add 0.2 parts by weight of silane coupling agent KH570 to 6 parts by weight of an ethanol aqueous solution with a volume concentration of 55%, stir for 55 min, continue to add 1 part by weight of zinc oxide whiskers, place in a constant temperature water bath at 42 °C and ultrasonically stir for 4.5 h, take out, filter by suction, and dry to obtain pre-modified zinc oxide whiskers;

[0069] (2) Heat 1 part by weight of γ-aminopropyltrimethoxysilane to 35 °C, slowly add 0.92 parts by weight of 4-methylcyclohexyl isocyanate, reflux and react for 4 h, stop the reaction, and cool to room temperature to obtain a modified silane;

[0070] (3) Mix 5 parts by weight of isopropanol and 0.1 part by weight of the modified silane, add 1 part by weight of the pre-modified zinc oxide whiskers, raise the temperature to 75 °C and react for 3 h, take out, filter by suction, and dry to obtain modified zinc oxide whiskers.

[0071] Zinc oxide whiskers, diameter 0.5 - 5 μm, length 10 - 50 μm, Hubei Xinyuhong Biomedical Technology Co., Ltd.

[0072] A preparation method of a water-resistant corrugated paper, comprising the following steps:

[0073] (1) Coat the reinforcing liquid on the surface of the corrugated paper layer, dry at 55 °C for 25 h, and the thickness of the reinforcing layer obtained after drying the reinforcing liquid is 3 μm to obtain a corrugated cardboard layer;

[0074] (2) Adhere the hard corrugated paper layer to the surfaces of the face paper and the inner paper through an adhesive, and the adhesive is a surface sizing agent of model GBS-02 to obtain a high-strength new corrugated cardboard.

[0075] Comparative Example 1

[0076] The difference between this comparative example and Example 1 is that: 27% of organosilicon-modified acrylic resin, 10% of waterborne fluorocarbon resin, and 8% of waterborne epoxy resin are replaced with: 15% of organosilicon-modified acrylic resin, 15% of waterborne fluorocarbon resin, and 15% of waterborne epoxy resin.

[0077] Comparative Example 2

[0078] The difference between this comparative example and Example 1 is that: 27% of organosilicon-modified acrylic resin, 10% of waterborne fluorocarbon resin, and 8% of waterborne epoxy resin are replaced with: 45% of organosilicon-modified acrylic resin.

[0079] Comparative Example 3

[0080] The difference between this comparative example and Example 1 is that the modified silica sol includes modified silica sol A, modified silica sol B, and modified silica sol C with a weight ratio of 1:1:1; among them, the particle size of modified silica sol A is 6-9 nm, and the model is MA7-30; the particle size of modified silica sol B is 10-15 nm, and the model is M12-40; the particle size of modified silica sol C is 4-6 nm, and the model is M5-15. Shandong Baite New Materials Co., Ltd.

[0081] Comparative Example 4

[0082] The difference between this comparative example and Example 1 is that the modified zinc oxide whiskers are replaced with zinc oxide whiskers. Zinc oxide whiskers, with a diameter of 0.5-5 μm and a length of 10-50 μm, Hubei Xinyuhong Biomedical Technology Co., Ltd.

[0083] Comparative Example 5

[0084] The difference between this comparative example and Example 1 is that the preparation method of the modified zinc oxide whiskers includes the following steps:

[0085] Add 0.2 parts by weight of silane coupling agent KH570 to 6 parts by weight of an ethanol aqueous solution with a volume concentration of 55%, stir for 55 min, then continue to add 1 part by weight of zinc oxide whiskers, and place them in a constant temperature water bath at 42°C for ultrasonic stirring for 4.5 h. Take out, filter by suction, and dry to obtain modified oxidizing whiskers.

[0086] Performance Test

[0087] Perform performance tests on the corrugated papers prepared in Examples 1-2 and Comparative Examples 1-5.

[0088] (1) Water absorption rate: Prepare corrugated paper samples with a size of 10 cm × 10 cm.

[0089] Weigh the initial mass m1 of each sample in a dry environment, completely immerse the sample in distilled water, ensuring that the water surface covers the sample by at least 2 cm. After soaking for 24 hours, take out the sample and gently blot the surface moisture with filter paper. Immediately weigh the mass m2 of the sample.

[0090] Water absorption rate = (m2 - m1) ÷ m1 × 100%.

[0091] (2) Retention rate of wet heat strength: Refer to GB / T2679.8-2016 "Determination of Ring Crush Strength of Paper and Board" and ASTM D642.

[0092] Dry strength test: Cut the test specimen into 152 mm × 12 mm long strips (10 parallel samples). Use a universal material testing machine to compress at a rate of 12.5 mm / min and record the maximum compressive strength F dry .

[0093] Wet strength test: Samples of the same batch were immersed in water at 50 °C for 1 hour, taken out and drained for 2 minutes, and the surface moisture was wiped off. Immediately test the wet compressive strength F wet . Strength retention rate after damp heat cycling = F wet / F dry × 100%.

[0094] (3) Moisture-proof aging: Refer to GB / T4857.2 - 2005 "Basic tests for transport packages of packages - Part 2: Conditioning at controlled temperature and humidity". The constant temperature and humidity chamber was set to a temperature of 40 °C and a relative humidity of 90%. The specimens (size 200mm × 200mm × thickness) were placed horizontally on the bracket, avoiding contact with the chamber wall. For the specimen state, continue for 72 hours, and judge whether there is edge warping: (edge warping degree < 2mm / m, thickness change < 5%). Whether delamination / blistering occurs: Visually inspect the surface for delamination or bulging.

[0095] The results are shown in Table 1.

[0096] Table 1 Performance test results

[0097]

[0098]

[0099] As can be seen from Table 1, the corrugated paper of Examples 1 - 2 has low water absorption rate, good damp heat resistance effect, good moisture-proof aging effect, no collapse and no delamination in 72h, and can meet the requirements of most logistics aging for packaging boxes.

[0100] In Comparative Example 1, the ratios of silicone-modified acrylic resin, waterborne fluorocarbon resin, and waterborne epoxy resin are different, and the water absorption rate of the corrugated paper becomes higher, indicating that the three resins with specific ratios can synergistically improve the water absorption effect of the corrugated paper.

[0101] In Comparative Example 2, only silicone-modified acrylic resin is used, and the comprehensive water resistance effect of the corrugated paper decreases to varying degrees.

[0102] In Comparative Example 3, the composition of the silicone-modified acrylic resin is different, and the moisture-proof effect of the corrugated paper decreases.

[0103] In Comparative Example 4, the zinc oxide whiskers are not modified, and in Comparative Example 5, the modification methods are different, resulting in a decrease in the strength retention rate of the corrugated paper in a damp heat environment.

[0104] In summary, as one of the mainstream packaging materials, the waterproofness, strength, and moisture and heat resistance of corrugated paper directly affect the safety and reliability of packaging. Through the performance tests of water absorption rate, moisture and heat strength retention rate, and moisture-proof aging of corrugated paper, and ensuring that they meet high-standard requirements, the present invention can significantly improve the quality and efficiency of e-commerce logistics packaging. When the water absorption rate is low, it indicates that the corrugated paper has good waterproof performance and can effectively protect the internal goods from moisture. This is particularly important for humidity-sensitive goods such as food and electronic devices, avoiding damage or deterioration of the goods caused by packaging moisture absorption, thereby reducing the return rate and customer complaints. Corrugated paper needs to maintain sufficient compressive strength in a humid and hot environment to protect the goods. Through the moisture and heat strength retention rate test, the strength retention ability of corrugated paper after immersion in water can be verified. The corrugated paper of the present invention still has strong bearing capacity under humid conditions, effectively preventing packaging deformation or damage. This not only improves the safety of logistics transportation but also extends the service life of the packaging and reduces the cost of replacing the packaging. Long-term storage or long-distance transportation may cause corrugated paper to be exposed to a high-humidity environment. The corrugated paper of the present invention can maintain its shape integrity and structural stability during long-term storage. This is particularly important for e-commerce logistics because stable packaging can better adapt to complex storage and transportation environments, ensuring that the goods are delivered to consumers intact.

[0105] The high-performance corrugated paper of the present invention can reduce resource waste by reducing packaging damage and reuse, while meeting the requirements of green environmental protection, bringing economic benefits to e-commerce enterprises. This high-quality packaging can not only protect the goods from the external environment but also enhance the shopping experience of consumers, helping the e-commerce industry achieve more efficient and environmentally friendly development goals.

[0106] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle described in the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A water-resistant corrugated paper, characterized in that: The paperboard includes a face paper, a corrugated paperboard layer and an inner paper layer in order from the outside to the inside. The corrugated paperboard layer is obtained by soaking the corrugated paperboard in a water-resistant enhancement liquid and then drying it. The corrugated paperboard layer is adhered to the surface of the face paper and the inner paper layer respectively by an adhesive. The water-resistant enhancing liquid comprises the following components in weight percentage: 25-30% of organic silicon modified acrylic resin, 8-12% of water-based fluorocarbon resin, 6-10% of water-based epoxy resin, 12-17% of modified silica sol, 6-10% of water-based tackifying emulsion, 3-6% of carbodiimide anti-hydrolysis agent, 2-7% of modified zinc oxide whisker, 6-8% of water-based polyurethane crosslinking agent, and the balance is water.

2. The water-resistant corrugated paper according to claim 1, characterized in that: Silicone modified acrylic resin, viscosity 3500-4000mPa.s, solid content 38-42wt%.

3. The water-resistant corrugated paper according to claim 1, characterized in that: The modified silica sol comprises modified silica sol A, modified silica sol B and modified silica sol C in a weight ratio of 1: (1.2-1.5): (0.5-0.7); wherein the particle size of the modified silica sol A is 6-9nm; the particle size of the modified silica sol B is 10-15nm; and the particle size of the modified silica sol C is 4-6nm.

4. The water-resistant corrugated paper according to claim 1, characterized in that: The preparation method of modified zinc oxide whisker comprises the following steps: (1) adding silane coupling agent KH570 to an ethanol aqueous solution, stirring, continuing to add zinc oxide whiskers, ultrasonically stirring in a constant temperature water bath, taking out, filtering, and drying to obtain pre-modified zinc oxide whiskers; (2) Mix isopropanol and modified silane, add pre-modified zinc oxide whiskers, heat to 70-75° C. and react for 3-4 hours, take out, filter and dry to obtain modified zinc oxide whiskers.

5. The water-resistant corrugated paper according to claim 4, characterized in that: The preparation method of modified silane comprises the following steps: adding 0.92-0.97 parts by weight of 4-methylcyclohexyl isocyanate to 1 part by weight of γ-aminopropyltrimethoxysilane, performing reflux reaction for 3-4 hours, stopping the reaction, cooling to room temperature, and obtaining modified silane.

6. The water-resistant corrugated paper according to claim 4, characterized in that: Zinc oxide whiskers, diameter 0.5-5μm, length 10-50μm.

7. The water-resistant corrugated paper according to claim 4, characterized in that: The volume concentration of the ethanol aqueous solution is 50-60%.

8. The water-resistant corrugated paper according to claim 1, characterized in that: The preparation method of the water-resistant enhancement liquid comprises the following steps: mixing the components of the water-resistant enhancement liquid uniformly to obtain the water-resistant enhancement liquid.

9. A method for preparing water-resistant corrugated paper according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) applying a reinforcing liquid to the surface of the corrugated paper layer and drying the reinforcing liquid, wherein the reinforcing layer obtained after drying has a thickness of 2-4 μm, thereby obtaining a corrugated paper layer; (2) The rigid corrugated paper layer is adhered to the surface of the face paper and the inner paper by an adhesive to obtain a high-strength new type of corrugated paperboard.

10. Use of the water-resistant corrugated paper according to any one of claims 1 to 8 in logistics packaging.

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