A waterproof and pressure-resistant packaging box and a preparation method thereof

Abstract

The present application relates to the technical field of packaging box preparation, and specifically discloses a waterproof and pressure-resistant packaging box and its preparation method. The waterproof and pressure-resistant packaging box of the present application is made of waterproof and pressure-resistant corrugated paper, which includes base paper and a waterproof and pressure-resistant layer. The waterproof and pressure-resistant layer is formed by applying a waterproof and pressure-resistant coating on the surface of the base paper. The waterproof and pressure-resistant coating is mainly made of the following raw materials: epoxy resin, curing agent, active diluent, anti-settling agent, solvent, waterproof agent, auxiliary agent, and the auxiliary agent is composed of lime, elastic fiber, and glass fiber; the preparation method includes the following steps: mixing epoxy resin, curing agent, active diluent, anti-settling agent, solvent, waterproof agent, and auxiliary agent to prepare a waterproof and pressure-resistant coating; applying the waterproof and pressure-resistant coating on the surface of the base paper, drying to form a waterproof and pressure-resistant layer, and nailing the base paper with the waterproof and pressure-resistant layer on the surface to obtain a packaging box. The waterproof and pressure-resistant packaging box of the present application has better waterproof properties.

Description

Technical Field

[0001] The present application relates to the technical field of packaging box preparation, and more specifically, to a waterproof and pressure-resistant packaging box and a preparation method thereof. Background Art

[0002] Corrugated paper boxes have become the main paper product transportation packaging container with its excellent cushioning and protection performance, good printing display and green environmental protection advantages, and have been widely used in the transportation of various commodities. In order to meet the requirements of different products, various carton products with special properties, such as waterproof, rust-proof, fresh-keeping, anti-slip, and oil-proof, are constantly being developed.

[0003] In recent years, the consumption of low-temperature fresh-keeping products, aquatic products, and frozen foods has been increasing, and the market demand for moisture-proof and waterproof corrugated boxes has also increased day by day, bringing huge opportunities and challenges to carton companies. Frozen foods can generally be divided into beverages, aquatic products and other foods that need to be kept fresh at low temperatures, and freeze-dried foods. At present, corrugated boxes with heat insulation functions are mainly used to store and transport frozen foods at low temperatures. These cartons are treated with composite resins and aluminum vapor-deposited films or foamed resins to reduce the temperature increase of the internal products during circulation and achieve the purpose of heat preservation.

[0004] After the products leave the cold storage, the temperature difference under normal temperature will produce condensation, which will cause a large amount of water droplets to hang on the inside and outside of the carton. After the paper packaging products absorb water and become damp, the strength is greatly reduced. The rupture or collapse of the packaging box caused by the reduction in strength will not only lose the protective function of the packaging, but also directly affect the quality of the packaged goods and the appearance of the packaging.

[0005] Therefore, how to prepare a packaging box with good waterproof performance is a technical problem to be solved. Summary of the invention

[0006] In order to improve the waterproofness of a packaging box, the present application provides a waterproof and pressure-resistant packaging box and a preparation method thereof.

[0007] In a first aspect, the present application provides a waterproof and pressure-resistant packaging box, which adopts the following technical solution:

[0008] A waterproof and pressure-resistant packaging box is made of waterproof and pressure-resistant corrugated paper, characterized in that: the waterproof and pressure-resistant corrugated paper comprises base paper and a waterproof and pressure-resistant layer, the waterproof and pressure-resistant layer is formed by coating a waterproof and pressure-resistant coating on the surface of the base paper, the waterproof and pressure-resistant coating is mainly made of the following raw materials in parts by weight: 20-30 parts of epoxy resin, 10-15 parts of curing agent, 2-3 parts of active diluent, 1-2 parts of anti-settling agent, 5-10 parts of solvent, 5-10 parts of waterproofing agent, and 2-3 parts of auxiliary agent, the waterproofing agent is at least two of tung oil, calcium stearate, and water-swellable rubber, and the auxiliary agent is composed of lime, elastic fiber, and glass fiber in a mass ratio of (4-5):(1-2):(1-2).

[0009] By adopting the above technical scheme, the waterproofing agent and the auxiliary agent cooperate with each other and interact with other components in the waterproof and pressure-resistant coating, so that the obtained packaging box has better pressure resistance and waterproofness. The presence of inherent polar hydroxyl groups and ether bonds in the epoxy resin molecular chain makes the epoxy resin have better adhesion, and the epoxy resin and the curing agent undergo cross-linking reaction to form a polymer with a three-dimensional network structure, which is convenient for adhering the waterproofing agent and the auxiliary agent to the surface of the base paper. The waterproof and pressure-resistant layer thus formed has better mechanical properties. The elastic fibers and glass fibers in the auxiliary agent overlap each other to form a large number of loose The randomly distributed network structure makes it easier for calcium stearate and water-swelling rubber in the waterproofing agent to be distributed in the pores of the network structure. The water-swelling rubber absorbs water and swells, thereby forming a waterproof layer and blocking the channel for water transmission. Calcium stearate reacts with lime to generate water-insoluble stearate. Part of the stearate is distributed on the surface of the water-swelling rubber, and part of the stearate is distributed in the pores between adjacent water-swelling rubbers, so as to further reduce the further penetration of water. The addition of tung oil facilitates further reducing capillary absorption, so as to increase the waterproofness of the waterproof and pressure-resistant coating.

[0010] Preferably, the waterproofing agent is composed of tung oil, calcium stearate, and water-swellable rubber in a mass ratio of (3-4):(1-2):(3-4).

[0011] By adopting the above technical scheme, the waterproofing agent is compounded from three components of tung oil, calcium stearate and water-swelling rubber. The ratio of the three components is adjusted to optimize the ratio of the three components. The film formed by the tung oil is wrapped on the surface of the water-swelling rubber, and the hydrophobic film formed by the reaction of calcium stearate and lime and the film formed by the tung oil are partially wrapped on the surface of the water-swelling rubber and partially filled in the pores formed by adjacent water-swelling rubbers, so as to enhance the waterproof effect of the waterproofing agent in the waterproof and pressure-resistant layer. At the same time, the water-swelling rubber has better elasticity, so as to further enhance the elasticity of the waterproof and pressure-resistant layer.

[0012] Preferably, the particle size distribution of the water-swellable rubber is 6-8 μm accounting for 30-35% by mass, 8-15 μm accounting for 20-35% by mass, 15-25 μm accounting for 25-30% by mass, and 25-30 μm accounting for 10-25% by mass.

[0013] By adopting the above technical scheme, the water-swellable rubber is graded with a variety of particle sizes. The large-size water-swellable rubber cooperates with the elastic fiber and glass fiber in the auxiliary agent to form the skeleton of the waterproof and pressure-resistant layer, so as to improve the strength of the waterproof and pressure-resistant layer. The small-size water-swellable rubber is filled in the pores of the waterproof and pressure-resistant layer to enhance the waterproofness of the waterproof and pressure-resistant layer. At the same time, the water-swellable rubber of different particle sizes is evenly distributed in the waterproof and pressure-resistant layer, which helps to further enhance the waterproofness of the waterproof and pressure-resistant layer, thereby improving the waterproofness of the packaging box.

[0014] Preferably, the water-swellable rubber is a modified water-swellable rubber, and the preparation method of the modified water-swellable rubber comprises the following steps: immersing the water-swellable rubber in a styrene-acrylic emulsion to obtain a pretreated water-swellable rubber, mixing the pretreated water-swellable rubber with calcium sulfate whiskers, and drying to obtain the modified water-swellable rubber.

[0015] By adopting the above technical scheme, the styrene-acrylic emulsion is wrapped on the surface of the water-swelling rubber to form an adhesive layer, and the calcium sulfate whiskers are bonded to the surface of the water-swelling rubber through the adhesive layer. The calcium sulfate whiskers have a large specific surface area and high fluffiness. They adhere to the surface of the water-swelling rubber and help to enhance the strength of the water-swelling rubber. At the same time, the calcium sulfate whiskers and the elastic fibers and glass fibers in the auxiliary agent interweave to form a network structure, which helps to enhance the stability of the water-swelling rubber in the network structure formed by the elastic fibers and glass fibers, thereby enhancing the stability of the waterproof and pressure-resistant layer and improving the waterproofness of the packaging box.

[0016] Preferably, the elastic fiber is composed of polyolefin elastic fiber and polyether ester elastic fiber in a mass ratio of (4-5):(1-2).

[0017] By adopting the above technical scheme, the elastic fiber adopts a compound method of polyolefin elastic fiber and polyether ester elastic fiber. The polyolefin elastic fiber is a hydrophobic fiber with high strength and good wear resistance, while the polyether ester elastic fiber includes a hard segment and a soft segment. The soft segment is mainly a polyether segment, which has good softness, a long chain, and is easy to stretch and deform; the hard segment is a polyester segment, which acts as a node when the fiber is deformed by force and imparts elastic recovery properties. The polyether ester elastic fiber and the polyolefin elastic fiber cooperate with each other to further improve the entanglement between the glass fiber and the stability and elasticity of the network structure, so as to further improve the stability and waterproofness of the waterproof and pressure-resistant layer.

[0018] Preferably, the glass fiber is mesh glass fiber.

[0019] By adopting the above technical scheme, the monofilaments in the mesh glass fiber are distributed in multiple directions, forming a chaotic support system in the waterproof and pressure-resistant layer, which is convenient for better entanglement with the elastic fibers. The formed mesh structure is more stable, and the water-absorbing and swelling rubber is distributed in the mesh structure, which is more stable and convenient for improving the strength and waterproofness of the waterproof and pressure-resistant layer.

[0020] Preferably, the mesh glass fiber is a modified mesh glass fiber, and the preparation method of the modified mesh glass fiber comprises the following steps: roughening the mesh glass fiber, then immersing it in a styrene-acrylic emulsion to obtain pretreated mesh glass fiber, mixing the pretreated mesh glass fiber with mixed powder, and drying, wherein the mixed powder is composed of paraffin wax and silica fume in a mass ratio of (5-8):(2-3).

[0021] Preferably, the particle size ratio of the paraffin wax to the silica fume powder is 1:(3-4).

[0022] By adopting the above technical scheme, after the mesh glass fiber is roughened, the contact area is increased, and more styrene acrylic emulsion adheres to the surface, so as to form a bonding layer on the surface of the glass fiber. The paraffin in the mixed powder has a waterproof effect, and the silica fume powder has high strength. The paraffin and the silica fume powder are staggered on the surface of the glass fiber, which further enhances the waterproofness of the glass fiber on the one hand, and enhances the strength of the glass fiber on the other hand, so as to further improve the waterproofness and strength of the waterproof and pressure-resistant layer.

[0023] Preferably, the diameter ratio of the glass fiber to the elastic fiber is (4-5):(1-2).

[0024] By adopting the above technical scheme, the diameter ratio of the glass fiber and the elastic fiber is adjusted to achieve an optimal diameter ratio of the glass fiber to the elastic fiber. The diameter of the glass fiber is larger than the diameter of the elastic fiber, and the strength of the glass fiber is higher. Some thinner elastic fibers may be wrapped around the surface of the glass fiber to form an elastic layer, so as to further improve the waterproofness of the waterproof and pressure resistant layer, thereby improving the waterproofness of the manufactured packaging box.

[0025] Preferably, the waterproof and pressure-resistant layer has a thickness of 1-2 mm.

[0026] By adopting the above technical scheme, when the thickness of the waterproof and pressure-resistant layer is too thin, it cannot play an effective waterproof and pressure-resistant role. When the thickness is too thick, the preparation cost of the packaging box is high. When the thickness of the waterproof and pressure-resistant layer is 1-2mm, the waterproof and pressure-resistant effects of the prepared packaging box are better, and the preparation cost of the packaging box is effectively controlled.

[0027] In a second aspect, the present application provides a method for preparing a waterproof and pressure-resistant packaging box, which adopts the following technical solution:

[0028] A method for preparing a waterproof and pressure-resistant packaging box comprises the following steps:

[0029] (1) Preparation of waterproof and pressure-resistant coating: epoxy resin, curing agent, reactive diluent, anti-settling agent, solvent, waterproofing agent and auxiliary agent are mixed to prepare waterproof and pressure-resistant coating;

[0030] (2) Packaging box preparation: the waterproof and pressure-resistant coating prepared in step (1) is coated on the surface of the base paper, dried to form a waterproof and pressure-resistant layer, and then the base paper with the waterproof and pressure-resistant layer on the surface is nailed to obtain a packaging box.

[0031] Preferably, the drying temperature in step (2) is 55-60° C. and the drying time is 1-2 h.

[0032] Preferably, in step (2), the boxes are stapled using a box stapler.

[0033] By adopting the above technical scheme, the present application adopts a homemade waterproof and pressure-resistant coating, and coats the homemade waterproof and pressure-resistant coating on the base paper, and then nails the boxes together to obtain the packaging box. The packaging box thus obtained has good waterproofness and pressure resistance, and the packaging box preparation process is simple.

[0034] In summary, this application has the following beneficial effects:

[0035] 1. The waterproof and pressure-resistant packaging box of the present application is coated with a waterproof and pressure-resistant coating on the surface of the base paper to form a waterproof and pressure-resistant layer on the surface of the base paper, thereby reducing the problem of reduced strength of the packaging box due to moisture.

[0036] 2. The waterproof and pressure-resistant coating used in the waterproof and pressure-resistant packaging box of the present application contains waterproofing agent, auxiliary agent and epoxy resin. The epoxy resin bonds the waterproofing agent and auxiliary agent to the surface of the base paper. The elastic fibers and glass fibers in the auxiliary agent form a mesh structure on the surface of the base paper, thereby fixing the waterproofing agent in the waterproof and pressure-resistant layer, so as to further improve the strength and waterproofness of the waterproof and pressure-resistant layer. DETAILED DESCRIPTION

[0037] The present application is further described in detail below with reference to the embodiments.

[0038] Preparation example of waterproof and pressure-resistant coating

[0039] Preparation Example 1: A waterproof and pressure-resistant coating, including the following raw materials by weight: 20kg of epoxy resin, 10kg of curing agent, 2kg of active diluent, 1kg of anti-settling agent, 5kg of solvent, 5kg of waterproofing agent, and 2kg of auxiliary agent, wherein the auxiliary agent is composed of lime, elastic fiber, and glass fiber in a mass ratio of 4:1:1, the epoxy resin is E-44 bisphenol A epoxy resin; the curing agent is triethanolamine; the active diluent is n-butyl glycidyl ether; the anti-settling agent is hydrophobic fumed silica; the solvent is n-butanol, the waterproofing agent is composed of tung oil and calcium stearate in a mass ratio of 1:1, the elastic fiber is polyolefin elastic fiber, and the diameter ratio of glass fiber to elastic fiber is 1:1. The diameter of the glass fiber is 10μm.

[0040] Preparation Example 2: A waterproof and pressure-resistant coating, which differs from Preparation Example 1 in that it includes the following raw materials by weight: 30 kg of epoxy resin, 15 kg of curing agent, 3 kg of active diluent, 2 kg of anti-settling agent, 10 kg of solvent, 10 kg of waterproofing agent, and 3 kg of auxiliary agent, wherein the auxiliary agent is composed of lime, elastic fiber, and glass fiber in a mass ratio of 5:2:2.

[0041] Preparation Example 3: A waterproof and pressure-resistant coating, which differs from Preparation Example 2 in that the waterproofing agent is composed of tung oil, calcium stearate, and water-swelling rubber in a mass ratio of 3:1:3, and the particle size of the water-swelling rubber is 15 μm.

[0042] Preparation Example 4: A waterproof and pressure-resistant coating, which differs from Preparation Example 2 in that the waterproofing agent is composed of tung oil, calcium stearate, and water-swelling rubber in a mass ratio of 4:2:4, and the particle size of the water-swelling rubber is 15 μm.

[0043] Preparation Example 5: A waterproof and pressure-resistant coating, which differs from Preparation Example 4 in that the particle size distribution of the water-absorbing and swelling rubber is 6-8 μm (30% by mass), 8-15 μm (25% by mass), 15-25 μm (30% by mass), and 25-30 μm (15% by mass).

[0044] Preparation Example 6: A waterproof and pressure-resistant coating, which differs from Preparation Example 5 in that the water-swelling rubber is a modified water-swelling rubber. The preparation method of the water-swelling rubber comprises the following steps: immersing the water-swelling rubber in a styrene-acrylic emulsion for 10 minutes to obtain a pretreated water-swelling rubber, mixing the pretreated water-swelling rubber with calcium sulfate whiskers, and drying to obtain the coating.

[0045] Preparation Example 7: A waterproof and pressure-resistant coating, which differs from Preparation Example 6 in that the elastic fiber is composed of polyolefin elastic fiber and polyether ester elastic fiber in a mass ratio of 5:2.

[0046] Preparation Example 8: A waterproof and pressure-resistant coating, which differs from Preparation Example 7 in that the glass fiber is a mesh glass fiber.

[0047] Preparation Example 9: A waterproof and pressure-resistant coating, which is different from Preparation Example 8 in that the mesh glass fiber is a modified mesh glass fiber, and the preparation method of the modified mesh glass fiber comprises the following steps: roughening the mesh glass fiber, and then immersing it in a styrene-acrylic emulsion for 15 minutes to obtain a pretreated mesh glass fiber, mixing the pretreated mesh glass fiber with a mixed powder, and drying the mixed powder to obtain a mixture of paraffin wax and silica ash powder in a mass ratio of 8:3. The ratio of the particle size of paraffin wax to silica ash powder is 1:4. The particle size of silica ash powder is 5 μm. The roughening treatment method comprises the following steps: placing the mesh glass fiber in an acidic solution for corrosion treatment, the corrosion time is 13 seconds, the acidic solution is a sulfuric acid solution, and the molar concentration of the substance in the sulfuric acid solution is 1 mol / L.

[0048] Preparation Example 10: A waterproof and pressure-resistant coating, which differs from Preparation Example 7 in that the diameter ratio of glass fiber to elastic fiber is 5:2.

[0049] Preparation Example 11: A waterproof and pressure-resistant coating, which differs from Preparation Example 7 in that the diameter ratio of glass fiber to elastic fiber is 2:5.

[0050] Example

[0051] Example 1: A waterproof and pressure-resistant packaging box is made of waterproof and pressure-resistant corrugated paper, which includes a base paper and a waterproof and pressure-resistant layer, and the waterproof and pressure-resistant layer is formed by coating a waterproof and pressure-resistant coating on the surface of the base paper, and the waterproof and pressure-resistant coating is prepared in Preparation Example 1. The thickness of the waterproof and pressure-resistant layer is 1 mm.

[0052] The method for preparing the waterproof and pressure-resistant packaging box comprises the following steps:

[0053] (1) Preparation of waterproof and pressure-resistant coating: epoxy resin, curing agent, reactive diluent, anti-settling agent, solvent, waterproofing agent and auxiliary agent are mixed to prepare waterproof and pressure-resistant coating;

[0054] (2) Packaging box preparation: The waterproof and pressure-resistant coating prepared in step (1) is coated on the surface of the base paper, dried to form a waterproof and pressure-resistant layer, and then the base paper with the waterproof and pressure-resistant layer on the surface is stapled by a box stapler to obtain a packaging box. The drying temperature is 60° C. and the drying time is 2 h.

[0055] Example 2: A waterproof and pressure-resistant packaging box, which is different from Example 1 in that the waterproof and pressure-resistant coating is prepared in Preparation Example 2. The thickness of the waterproof and pressure-resistant layer is 2 mm.

[0056] Table 1 Waterproof and pressure-resistant coating for waterproof and pressure-resistant packaging box of Example 1-11

[0057] Serial number Waterproof and pressure-resistant coating Example 1 Preparation Example 1 Example 2 Preparation Example 2 Example 3 Preparation Example 3 Example 4 Preparation Example 4 Example 5 Preparation Example 5 Example 6 Preparation Example 6 Example 7 Preparation Example 7 Example 8 Preparation Example 8 Example 9 Preparation Example 9 Example 10 Preparation Example 10 Embodiment 11 Preparation Example 11

[0058] Example 3-11: A waterproof and pressure-resistant packaging box, the waterproof and pressure-resistant coating used is as shown in Table 1. The difference from Example 2 is that the preparation example of the waterproof and pressure-resistant coating used is different.

[0059] Comparative Example

[0060] Comparative Example 1: A waterproof and pressure-resistant packaging box, which differs from Example 1 in that no waterproofing agent is added.

[0061] Comparative Example 2: A waterproof and pressure-resistant packaging box, which differs from Example 1 in that no auxiliary agent is added.

[0062] Comparative Example 3: A waterproof and pressure-resistant packaging box, which differs from Example 1 in that the waterproofing agent is tung oil.

[0063] Comparative Example 4: A waterproof and pressure-resistant packaging box, which differs from Example 1 in that the auxiliary agent is lime.

[0064] Detection Methods

[0065] Edge compression strength test: The waterproof and pressure-resistant packaging boxes prepared in Examples 1-11 and Comparative Examples 1-4 were taken, and the edge compression strength of the waterproof and pressure-resistant packaging boxes was tested according to the test method in GB / T2679.17-1997 "Determination of edge compression strength of corrugated cardboard (edge ​​reinforcement method)". The edge compression strength test results are shown in Table 2.

[0066] Waterproof performance test: Take the waterproof and pressure-resistant packaging boxes prepared in Examples 1-11 and Comparative Examples 1-4, fold the corrugated paper therein into a groove shape, and pour the same amount of clean water into the groove. After standing for 30 minutes and 1 hour, observe the surface water seepage, test the waterproof performance, and evaluate the waterproof performance level. There is no watermark at the bottom of the groove: 10; there is a watermark at the bottom of the groove but no water seepage: 5-9; there is water seepage at the bottom of the groove: 1-4; the test results are shown in Table 2.

[0067] Table 2 Waterproof and pressure-resistant packaging boxes of Examples 1-11 and Comparative Examples 1-4

[0068] Serial number Edge compression strength kN / m 30min water resistance test 1h water resistance test Example 1 7.37 10 10 Example 2 7.45 10 10 Example 3 7.85 10 10 Example 4 7.91 10 10 Example 5 8.18 10 10 Example 6 8.42 10 10 Example 7 8.53 10 10 Example 8 8.71 10 10 Example 9 8.94 10 10 Example 10 8.75 10 10 Embodiment 11 8.51 10 10 Comparative Example 1 6.67 5 3 Comparative Example 2 6.51 10 7 Comparative Example 3 7.12 10 6 Comparative Example 4 6.53 10 8

[0069] In combination with Example 1, Comparative Examples 1-2, and the data in Table 2, it can be seen that the waterproof and pressure-resistant packaging box prepared in Example 1 has better waterproofness and edge compression strength. The difference between Example 1 and Comparative Examples 1-2 is that waterproof agent and auxiliary agent are added to the waterproof and pressure-resistant coating of Example 1 at the same time. The inventor of the present application believes that the waterproof agent and auxiliary agent in the waterproof and pressure-resistant coating cooperate with each other and cooperate with other components in the waterproof and pressure-resistant coating. On the basis of improving the waterproofness of the waterproof and pressure-resistant packaging box, the edge compression strength of the waterproof and pressure-resistant packaging box is further improved.

[0070] In combination with Example 1, Comparative Examples 3-4, and the data in Table 2, it can be seen that the waterproof and pressure-resistant packaging box prepared in Example 1 has better waterproofness and edge compression strength. When the waterproofing agent is tung oil or the auxiliary agent is lime, the performance of the waterproof and pressure-resistant packaging box is poor.

[0071] In combination with Examples 1-2 and the data in Table 2, it can be seen that the waterproof and pressure-resistant packaging boxes prepared in Examples 1-2 have better waterproofness and pressure resistance, and the waterproof and pressure-resistant packaging boxes prepared by coating with the homemade waterproof and pressure-resistant coating of the present application have even better performance.

[0072] In combination with Examples 2-4 and the data in Table 2, it can be seen that the compressive resistance of the waterproof and pressure-resistant packaging boxes prepared in Examples 3-4 is better than the compressive resistance of the waterproof and pressure-resistant packaging boxes prepared in Example 2, and the waterproof property is better. The waterproofing agent in Examples 3-4 is compounded from three components: tung oil, calcium stearate, and water-swellable rubber. The inventors of the present application believe that the waterproofing agent is compounded from three components: tung oil, calcium stearate, and water-swellable rubber, and the three components cooperate with each other to improve the waterproof performance and compressive resistance of the waterproof and pressure-resistant packaging box.

[0073] In combination with Examples 4-5 and the data in Table 2, it can be seen that the compressive resistance of the waterproof and pressure-resistant packaging box of Example 5 is better than the compressive resistance of the waterproof and pressure-resistant packaging box prepared in Example 4. The inventors of the present application believe that by changing the particle size of the water-swellable rubber, the compressive strength of the waterproof and pressure-resistant packaging box can be improved.

[0074] In combination with Examples 5-6 and the data in Table 2, it can be seen that the compressive resistance of the waterproof and pressure-resistant packaging box of Example 6 is better than the compressive resistance of the waterproof and pressure-resistant packaging box prepared in Example 5. The inventors of the present application believe that: by modifying the water-swellable rubber and adhering calcium sulfate whiskers to the surface of the water-swellable rubber, it helps to improve the compressive strength of the waterproof and pressure-resistant packaging box.

[0075] In combination with Examples 6-8 and the data in Table 2, it can be seen that the compressive resistance of the waterproof and pressure-resistant packaging box of Example 8 is better than the compressive resistance of the waterproof and pressure-resistant packaging box prepared in Example 6. The inventor of the present application believes that the use of mesh glass fiber helps to improve the edge compression strength of the waterproof and pressure-resistant packaging box.

[0076] In combination with Examples 8-9 and the data in Table 2, it can be seen that the compressive resistance of the waterproof and pressure resistant packaging box of Example 9 is better than the compressive resistance of the waterproof and pressure resistant packaging box prepared in Example 8. The inventors of the present application believe that modifying the mesh glass fiber and adhering paraffin and silica fume particles to the outer layer of the mesh glass fiber can help to further improve the waterproofness and strength of the mesh glass fiber, thereby improving the compressive resistance and waterproofness of the waterproof and pressure resistant packaging box.

[0077] In combination with Example 7, Examples 10-11, and the data in Table 2, it can be seen that the waterproof and pressure-resistant packaging box prepared in Example 10 has better edge compression strength. The difference between Example 10 and Example 11 and Example 7 is that the diameter of the glass fiber in Example 10 is greater than the diameter of the elastic fiber, and the diameter of the glass fiber in Example 11 and Example 7 is less than or equal to the diameter of the elastic fiber. The inventors of the present application believe that adjusting the diameter ratio of the glass fiber to the elastic fiber can help enhance the compressive strength of the waterproof and pressure-resistant packaging box.

[0078] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A waterproof and pressure-resistant packaging box made of waterproof and pressure-resistant corrugated paper, characterized in that: The waterproof and pressure-resistant corrugated paper comprises a base paper and a waterproof and pressure-resistant layer, wherein the waterproof and pressure-resistant layer is formed by coating a waterproof and pressure-resistant coating on the surface of the base paper, wherein the waterproof and pressure-resistant coating is mainly made of the following raw materials in parts by weight: 20-30 parts of epoxy resin, 10-15 parts of curing agent, 2-3 parts of active diluent, 1-2 parts of anti-settling agent, 5-10 parts of solvent, 5-10 parts of waterproofing agent, and 2-3 parts of auxiliary agent, wherein the waterproofing agent is at least two of tung oil, calcium stearate, and water-swellable rubber, and the auxiliary agent is composed of lime, elastic fiber, and glass fiber in a mass ratio of (4-5):(1-2):(1-2); The waterproofing agent is composed of tung oil, calcium stearate and water-swelling rubber in a mass ratio of (3-4):(1-2):(3-4).

2. The waterproof and pressure-resistant packaging box according to claim 1, characterized in that: The particle size distribution of the water-swelling rubber is as follows: 6-8 μm accounts for 30-35% by mass, 8-15 μm accounts for 20-35% by mass, 15-25 μm accounts for 25-30% by mass, and 25-30 μm accounts for 10-25% by mass.

3. The waterproof and pressure-resistant packaging box according to claim 1, characterized in that: The water-swelling rubber is a modified water-swelling rubber. The preparation method of the modified water-swelling rubber comprises the following steps: immersing the water-swelling rubber in a styrene-acrylic emulsion to obtain a pretreated water-swelling rubber, mixing the pretreated water-swelling rubber with calcium sulfate whiskers, and drying the mixture.

4. The waterproof and pressure-resistant packaging box according to claim 1, characterized in that: The elastic fiber is composed of polyolefin elastic fiber and polyether ester elastic fiber in a mass ratio of (4-5):(1-2).

5. The waterproof and pressure-resistant packaging box according to claim 1, characterized in that: The glass fiber is a mesh glass fiber.

6. The waterproof and pressure-resistant packaging box according to claim 5, characterized in that: The mesh glass fiber is a modified mesh glass fiber. The preparation method of the modified mesh glass fiber comprises the following steps: roughening the mesh glass fiber, then immersing it in a styrene-acrylic emulsion to obtain pretreated mesh glass fiber, mixing the pretreated mesh glass fiber with mixed powder, and drying the mixed powder to obtain a pretreated mesh glass fiber. The mixed powder is composed of paraffin wax and silica fume powder in a mass ratio of (5-8):(2-3).

7. The waterproof and pressure-resistant packaging box according to claim 1, characterized in that: The diameter ratio of the glass fiber to the elastic fiber is (4-5):(1-2).

8. The waterproof and pressure-resistant packaging box according to claim 1, characterized in that: The thickness of the waterproof and pressure-resistant layer is 1-2 mm.

9. A method for preparing a waterproof and pressure-resistant packaging box according to any one of claims 1 to 8, characterized in that: The steps include: (1) Preparation of waterproof and pressure-resistant coating: epoxy resin, curing agent, active diluent, anti-settling agent, solvent, waterproofing agent and auxiliary agent are mixed to prepare waterproof and pressure-resistant coating; (2) Packaging box preparation: the waterproof and pressure-resistant coating prepared in step (1) is coated on the surface of the base paper, dried to form a waterproof and pressure-resistant layer, and then the base paper with the waterproof and pressure-resistant layer on the surface is nailed to obtain a packaging box.