Waterproof and moistureproof environment-friendly packaging paperboard

Abstract

The utility model relates to the technical field of packaging paperboards, in particular to a waterproof and moistureproof environment-friendly packaging paperboard which comprises a base material layer, a waterproof layer and a moistureproof layer, the waterproof layer is arranged on the outer side of the base material layer and made of a mixture of nano silicon dioxide and natural wax, and the moistureproof layer is arranged on the outer side of the waterproof layer and made of a mixture of nano silicon dioxide and natural wax. The waterproof layer is made of a composite material of modified starch and cellulose derivatives, the waterproof layer and the moisture-proof layer are connected through a nano-microporous structure, the nano-microporous structure is filled with a moisture absorbent, a groove is formed in the surface of the base material layer, the groove is filled with reinforced fibers, and a biodegradable film is further arranged between the waterproof layer and the base material layer. The waterproof and moistureproof environment-friendly packaging paperboard not only has excellent waterproof and moistureproof performance, but also meets the environment-friendly requirement, the production process is safe and harmless, meanwhile, the paperboard retains good air permeability and printing adaptability, and is suitable for various packaging requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging paperboards, in particular to a waterproof and moisture-proof environmentally friendly packaging paperboard. Background Art

[0002] With the development of social economy and the continuous improvement of people's living standards, the importance of the packaging industry as an important component supporting the circulation of modern goods has become increasingly prominent. Among the many packaging materials, cardboard is widely used in many fields due to its advantages such as low cost, easy processing and recyclability.

[0003] Existing environmentally friendly packaging cardboard materials have obvious deficiencies in terms of waterproofing and moisture resistance. That is, cardboard easily absorbs water and softens when exposed to water or humid environments, resulting in a decrease in structural strength and an inability to effectively protect the items inside. To address this problem, there are already some improvement measures on the market, such as enhancing the waterproofing properties of cardboard by coating it with plastic films such as polyethylene. However, although this treatment method can solve the waterproofing problem to a certain extent, it introduces plastic components, making the cardboard no longer completely degradable, which goes against the original intention of environmental protection. In addition, the plastic coating may also cause the air permeability and printing adaptability of the cardboard to decrease, limiting its application in certain fields. Another common solution is to apply a waterproofing agent or moisture-proof agent to the surface of the cardboard. Although this method can also improve the waterproofing and moisture-proofing properties of the cardboard to a certain extent, since waterproofing agents are mostly chemical synthetic substances, long-term use may pose a potential threat to human health, especially in packaging that comes into direct contact with food. At the same time, the use of such chemicals also increases production costs, which is not conducive to large-scale promotion and application. Utility Model Content

[0004] The purpose of the present utility model is to provide a waterproof and moisture-proof environmentally friendly packaging paperboard to address the shortcomings of the current environmentally friendly packaging paperboard in terms of waterproof and moisture-proof performance as mentioned in the above background art, as well as the environmental protection and safety issues brought about by traditional improvement measures such as plastic coatings and chemical waterproofing agents.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a waterproof and moisture-proof environmentally friendly packaging paperboard, comprising a substrate layer, a waterproof layer and a moisture-proof layer, wherein the waterproof layer is arranged on the outside of the substrate layer and is made of a mixture of nano-silicon dioxide and natural wax, the moisture-proof layer is arranged on the outside of the waterproof layer and is made of a composite material of modified starch and cellulose derivatives, the waterproof layer and the moisture-proof layer are connected by a nano-microporous structure, the nano-microporous structure is filled with a desiccant, the surface of the substrate layer is provided with grooves, the grooves are filled with reinforcing fibers, and a biodegradable film is also provided between the waterproof layer and the substrate layer.

[0006] Preferably, the thickness of the substrate layer is 0.5-1.5 mm, the thickness of the waterproof layer is 0.1-0.3 mm, the thickness of the moisture-proof layer is 0.2-0.5 mm, and the thickness of the biodegradable film is 0.05-0.1 mm.

[0007] Preferably, the diameter of the nano-silicon dioxide particles in the waterproof layer is 10-50 nm, and the mass ratio of nano-silicon dioxide to natural wax in the waterproof layer is 1:2 to 1:4.

[0008] Preferably, the modified starch in the moisture-proof layer is cross-linked starch, and the cellulose derivative is sodium carboxymethyl cellulose, and the two are mixed in a mass ratio of 1:1.

[0009] Preferably, the pore size of the nanoporous structure is 1-10 μm, and the moisture absorbent is evenly distributed in the nanoporous structure.

[0010] Preferably, the surface of the biodegradable film is provided with a plurality of small holes, the diameter of the small holes is 0.5-2 μm, and the small holes are filled with silver ion antibacterial agent.

[0011] Compared with existing technologies, the present invention offers the following advantages: This environmentally friendly, waterproof, and moisture-proof packaging paperboard not only exhibits excellent waterproof and moisture-proof properties, effectively preventing water penetration and maintaining structural strength, but also meets environmental requirements, is biodegradable, and has a safe and harmless production process. Furthermore, the paperboard retains excellent air permeability and printability, making it suitable for a variety of packaging needs. The design of the base material layer and reinforcing fibers significantly enhances the mechanical strength and durability of the paperboard. The multi-layer composite structure of the waterproof and moisture-proof layers effectively blocks water penetration, and the moisture absorbent within the nanoporous structure further enhances the moisture-proofing effect. These features work together to maintain the paperboard's high waterproof and moisture-proof properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of a waterproof and moisture-proof environmentally friendly packaging paperboard of the utility model;

[0013] Figure 2 This is a side structural diagram of a waterproof and moisture-proof environmentally friendly packaging paperboard of the utility model;

[0014] Figure 3 The utility model is a schematic diagram of the biodegradable film structure of a waterproof and moisture-proof environmentally friendly packaging paperboard.

[0015] In the figure: 1. Base material layer; 2. Waterproof layer; 3. Moisture-proof layer; 4. Nanoporous structure; 5. Desiccant; 6. Grooves; 7. Reinforcement fiber; 8. Biodegradable membrane; 9. Small holes. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] See also Figure 1-3The utility model provides a technical solution: a waterproof and moisture-proof environmentally friendly packaging paperboard, comprising a substrate layer 1, a waterproof layer 2 and a moisture-proof layer 3, the substrate layer 1 is made of recycled paper pulp, the waterproof layer 2 is arranged on the outside of the substrate layer 1, and is made of a mixture of nano-silicon dioxide and natural wax, the moisture-proof layer 3 is arranged on the outside of the waterproof layer 2, and is made of a composite material of modified starch and cellulose derivatives, the waterproof layer 2 and the moisture-proof layer 3 are connected by a nano-microporous structure 4, the nano-microporous structure 4 is filled with a desiccant 5, a groove 6 is provided on the surface of the substrate layer 1, and the groove 6 is filled with reinforcing fiber 7, which is a natural plant fiber, such as bamboo fiber or hemp fiber, a biodegradable film 8 is further provided between the waterproof layer 2 and the substrate layer 1, and the biodegradable film 8 is made of a blend of polylactic acid and polyhydroxyalkanoate, the substrate layer 1 of this structure provides basic support and structural strength, the reinforcing fiber 7 in the groove 6 further enhances the structural strength of the substrate layer 1, so that it can still maintain high strength and stability in a humid environment, the nano-silicon dioxide in the waterproof layer 2 The mixture formed with natural wax forms a dense waterproof barrier on the surface, effectively preventing moisture penetration. The modified starch and cellulose derivatives in the moisture-proof layer 3 further enhance the moisture-proof performance of the paperboard, preventing moisture from entering from the outside. The hygroscopic agent 5 in the nanoporous structure 4 can absorb a small amount of infiltrated moisture, keeping the interior of the paperboard dry. The biodegradable film 8 not only provides additional waterproof protection, but also quickly degrades after disposal, meeting environmental requirements. Therefore, the overall paperboard structure composed of the substrate layer 1, waterproof layer 2 and moisture-proof layer 3 not only solves the shortcomings of existing environmentally friendly packaging paperboard in terms of waterproofing and moisture resistance, avoids the environmental and health problems caused by traditional plastic coatings and chemical waterproofing agents, but also retains the air permeability and printing adaptability of the paperboard, making it suitable for various packaging needs, especially applications in high-demand fields such as food and medicine. The thickness of the substrate layer 1 is 0.5-1.5mm, the thickness of the waterproof layer 2 is 0.1-0.3mm, the thickness of the moisture-proof layer 3 is 0.2-0.5mm, and the thickness of the biodegradable film 8 is 0.05-0.1mm, the substrate layer 1 of this structure ensures the basic strength and stability of the cardboard, while not being too thick and maintaining good flexibility and processing performance. The waterproof layer 2 can form an effective waterproof barrier to prevent water penetration without affecting the overall thickness of the cardboard. The moisture-proof layer 3 provides additional moisture-proof protection, further enhancing the moisture-proof performance of the cardboard. The biodegradable film 8 not only increases the waterproof performance, but also ensures the environmental protection characteristics of the cardboard, and can be quickly degraded after being discarded. The thickness design of these layers enables each layer of material to fully exert its function while maintaining the overall lightness and flexibility of the cardboard. The diameter of the nano-silica particles in the waterproof layer 2 is 10-50nm, and the nano-silica particles in the waterproof layer 2 are 10-50nm. The mass ratio of silica to natural wax is 1:2 to 1:4. The small size and high surface area of ​​the nano-silica particles in the waterproof layer 2 of this structure enable them to be evenly dispersed in the natural wax to form a dense and continuous waterproof barrier, effectively blocking water penetration. The mass ratio of nano-silica to natural wax ensures that the mixture has appropriate flexibility and adhesion while maintaining good waterproof performance, avoiding cracks or falling off caused by improper proportions. The modified starch in the moisture-proof layer 3 is cross-linked starch, and the cellulose derivative is sodium carboxymethyl cellulose. The two are mixed in a mass ratio of 1:1. The mixture of cross-linked starch and sodium carboxymethyl cellulose in the moisture-proof layer 3 of this structure forms a uniform and stable The moisture-proof layer, the network structure of cross-linked starch can effectively capture and fix moisture to prevent it from penetrating into the interior of the cardboard, and sodium carboxymethyl cellulose 14 provides good film-forming and adhesion properties, ensuring that the moisture-proof layer 3 is firmly attached to the outside of the waterproof layer 2. The pore size of the nanoporous structure 4 is 1-10μm, and the desiccant 5 is evenly distributed in the nanoporous structure 4. The desiccant 5 is an inorganic salt desiccant, such as calcium chloride. This structure of the nanoporous structure 4 provides enough space for the desiccant 5 to be evenly distributed. The desiccant 5 can quickly absorb and lock trace amounts of moisture to prevent moisture from further penetrating into the interior of the cardboard. This not only enhances the moisture-proof performance of the cardboard, but also ensures that the desiccant 5 is in the nanoporous structure 4. Efficient utilization of the moisture absorber 5 avoids waste and localized moisture-proofing failure caused by uneven distribution. The surface of the biodegradable film 8 is provided with a number of small pores 9 with a diameter of 0.5-2 μm. These pores 9 are filled with a silver ion antimicrobial agent. This structure, in which the biodegradable film 8 serves as an intermediate layer between the waterproof layer 2 and the substrate layer 1, not only provides additional waterproof protection but also enhances the overall structural strength of the cardboard. The small pores 9 are evenly distributed across the surface of the biodegradable film 8, providing release channels for the silver ion antimicrobial agent, ensuring effective diffusion and a long-lasting antimicrobial effect. The silver ion antimicrobial agent filled in the pores 9 is slowly released, continuously killing and inhibiting bacterial growth, preventing the cardboard from mold and deterioration in a humid environment.

[0018] Working principle: When using this waterproof and moisture-proof environmentally friendly packaging cardboard, the base material layer 1 provides basic support and structural strength, the reinforcing fiber 7 can enhance the structural strength of the base material layer 1, and the mixture of nano-silica and natural wax in the waterproof layer 2 forms a dense waterproof barrier on the surface, effectively blocking moisture penetration. The modified starch and cellulose derivatives in the moisture-proof layer 3 further improve the moisture-proof performance of the cardboard. The desiccant 5 in the nano-porous structure 4 can quickly absorb and lock trace amounts of moisture to prevent moisture from further penetrating into the interior of the cardboard. The biodegradable film 8 not only provides additional waterproof protection, but also releases silver ion antibacterial agents through the small holes 9 on the surface, continuously killing and inhibiting bacterial growth, preventing the cardboard from moldy and deteriorating in a humid environment. Finally, the various layers of materials work synergistically to form a complete waterproof and moisture-proof environmentally friendly packaging cardboard, thereby completing a series of tasks.

[0019] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A waterproof and moisture-proof environmentally friendly packaging paperboard, comprising a base material layer (1), a waterproof layer (2) and a moisture-proof layer (3), characterized in that: The waterproof layer (2) is arranged on the outside of the substrate layer (1) and is made of a mixture of nano-silicon dioxide and natural wax. The moisture-proof layer (3) is arranged on the outside of the waterproof layer (2) and is made of a composite material of modified starch and cellulose derivatives. The waterproof layer (2) and the moisture-proof layer (3) are connected via a nano-microporous structure (4). The nano-microporous structure (4) is filled with a moisture absorbent (5). The surface of the substrate layer (1) is provided with a groove (6). The groove (6) is filled with reinforcing fibers (7). A biodegradable film (8) is also provided between the waterproof layer (2) and the substrate layer (1).

2. The waterproof and moisture-proof environmentally friendly packaging paperboard according to claim 1, characterized in that: The thickness of the substrate layer (1) is 0.5-1.5 mm, the thickness of the waterproof layer (2) is 0.1-0.3 mm, the thickness of the moisture-proof layer (3) is 0.2-0.5 mm, and the thickness of the biodegradable film (8) is 0.05-0.1 mm.

3. The waterproof and moisture-proof environmentally friendly packaging paperboard according to claim 1, characterized in that: The diameter of the nano-silicon dioxide particles in the waterproof layer (2) is 10-50 nm, and the mass ratio of the nano-silicon dioxide to the natural wax in the waterproof layer (2) is 1:2 to 1:

4.

4. The waterproof and moisture-proof environmentally friendly packaging paperboard according to claim 1, characterized in that: The modified starch in the moisture-proof layer (3) is cross-linked starch, and the cellulose derivative is sodium carboxymethyl cellulose, and the two are mixed in a mass ratio of 1:

1.

5. The waterproof and moisture-proof environmentally friendly packaging paperboard according to claim 1, characterized in that: The pore size of the nanoporous structure (4) is 1-10 μm, and the moisture absorbent (5) is evenly distributed in the nanoporous structure (4).

6. The waterproof and moisture-proof environmentally friendly packaging paperboard according to claim 1, characterized in that: The surface of the biodegradable film (8) is provided with a plurality of small holes (9), the diameter of the small holes (9) is 0.5-2 μm, and the small holes (9) are filled with silver ion antibacterial agent.

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