Tear-resistant moisture-proof desiccant packaging material and production method thereof

Abstract

The invention relates to the technical field of desiccant packaging materials, in particular to a tear-resistant moisture-proof desiccant packaging material and a production method thereof. The tear-resistant and moisture-proof desiccant packaging material comprises a polyester non-woven fabric, and a polypropylene film and a polyethylene film which are respectively adhered to two sides of the polyester non-woven fabric, raw materials of the polyester non-woven fabric comprise polyester fibers and prefabricated fibers. The polyester non-woven fabric is prepared by the following specific operations: dispersing prefabricated fibers on a web curtain of a web machine to form a bottom layer, uniformly dispersing polyester fibers on the surface of the bottom layer to form a middle layer, dispersing the prefabricated fibers on the surface of the middle layer to form a surface layer, and performing spunlace reinforcement. Theoretically, no glue exists, and good composite strength cannot be achieved just through hot pressing, however, the strength of the packaging material is enhanced in a specific mode, meanwhile, the product is environmentally friendly and efficient, the problems of water seepage and powder leakage of a drying agent packaging material are solved, and compared with products on the market, the packaging material has high tear resistance and improves the quality.

Description

Technical Field

[0001] The invention relates to the technical field of desiccant packaging materials, and in particular to a tear-resistant and moisture-proof desiccant packaging material and a production method thereof. Background Art

[0002] Desiccant is a kind of substance that can remove moisture from moist materials, and is usually divided into chemical desiccant and physical desiccant. Chemical desiccant (such as calcium sulfate and calcium chloride) can dry by combining with water to form hydrates, while physical desiccant (such as silica gel and montmorillonite) can dry by physically adsorbing water.

[0003] However, the desiccant cannot come into direct contact with the product and needs to be blocked by the desiccant packaging material. There are many types of desiccant packaging materials, each with its own advantages and disadvantages. When choosing packaging materials, it is necessary to make a comprehensive consideration based on the type of desiccant, its purpose, and the required protective performance. For application scenarios that require high moisture resistance, polyester film can be selected, while for scenarios that require high strength and breathability, non-woven fabrics are a better choice.

[0004] In the prior art, each layer of film or cloth-based material is often bonded with glue. Although this can make the packaging material have better tear strength, the polyester film has poor air permeability, which can easily lead to poor water absorption of the packaging material. If placed under ultraviolet rays, the polyester film is prone to aging, resulting in powder leakage of the packaging material.

[0005] With the rapid development of social life and economy and the continuous improvement of living standards, people have increasingly higher requirements for desiccant packaging materials. The air permeability, tear resistance and anti-aging performance have become issues of concern to people.

[0006] Therefore, it is urgent to develop a desiccant packaging material that not only needs to have good mechanical properties and excellent tear resistance, but also be breathable and moisture-permeable, resistant to aging, and avoid powder leakage. Summary of the invention

[0007] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a tear-resistant and moisture-proof desiccant packaging material and a production method thereof.

[0008] A tear-resistant and moisture-proof desiccant packaging material comprises: a polyester non-woven fabric, and a polypropylene film and a polyethylene film respectively attached to both sides of the polyester non-woven fabric; wherein the polypropylene film and the polyethylene film are both provided with through holes; the raw materials of the polyester non-woven fabric comprise: polyester fibers and prefabricated fibers; the mass ratio of the polyester fibers to the prefabricated fibers is 30-60:20-40.

[0009] Preferably, the thickness of the polyester nonwoven fabric is 20-60 μm, the thickness of the polypropylene film is 20-40 μm, and the thickness of the polyethylene film is 10-40 μm.

[0010] Preferably, the material used for the polyethylene film is linear low-density polyethylene.

[0011] Preferably, the polyester nonwoven fabric is produced by the following specific operations: prefabricated fibers are dispersed on a mesh curtain to form a bottom layer, polyester fibers are evenly dispersed on the surface of the bottom layer to form a middle layer, and then prefabricated fibers are dispersed on the surface of the middle layer to form a surface layer, and hydroentangled.

[0012] Preferably, the mass ratio of the prefabricated fibers used in the bottom layer to the prefabricated fibers used in the surface layer is 10-20:10-20.

[0013] Preferably, the prefabricated fiber has a diameter of 0.10-0.45 mm.

[0014] Preferably, the prefabricated fiber is prepared by the following specific operation: adding polyvinyl alcohol to water, stirring at 70-80°C for 1-2h, adjusting the pH value of the system to 8-9, keeping warm for 10-30min, adding graphene oxide and epichlorohydrin, stirring at 70-80°C for 1-2h, adjusting the system to be neutral, freeze-drying, and melt spinning.

[0015] Preferably, the mass ratio of polyvinyl alcohol, graphene oxide and epichlorohydrin is 1-5:1-5:0.1-1.

[0016] The production method of the tear-resistant and moisture-proof desiccant packaging material comprises the following steps: sticking a polypropylene film on one side of a polyester non-woven fabric, sticking a polyethylene film on the other side of the polyester non-woven fabric, hot pressing, and cooling to room temperature.

[0017] Preferably, the hot pressing temperature is 90-100° C., the hot pressing pressure is 0.4-0.5 MPa, and the hot pressing time is 2-6 s.

[0018] Beneficial effects: Since polyvinyl alcohol contains a large number of hydroxyl groups, polyvinyl alcohol has strong hydrophilicity. The present invention uses graphene oxide grafted on polyvinyl alcohol, which can significantly enhance the stability of the prefabricated fiber under the action of epichlorohydrin, and a large number of lamellar graphene are combined inside, so that the prefabricated fiber not only has excellent air permeability and moisture permeability, but also can maintain excellent mechanical strength of the system after absorbing water.

[0019] The present invention lays polyester fiber in the middle and lays prefabricated fibers on both sides to prepare a polyester non-woven fabric, so that the polyester non-woven fabric not only has a good hot pressing effect with a polypropylene film and a polyethylene film, but also has extremely high mutual bonding strength, high heat sealing strength, and good tear resistance. At the same time, it has excellent tear resistance even in a humid environment, and can significantly enhance the anti-ultraviolet function of the packaging material, effectively prevent the aging phenomenon of the desiccant packaging, effectively solve the problems existing in the current desiccant packaging materials, and is suitable for large-scale promotion and use.

[0020] The invention effectively avoids the use of glue, the product is environmentally friendly and efficient, and at the same time improves the water seepage and powder leakage problems of the desiccant packaging material, enhances the strength of the packaging material, has stronger tear resistance compared with products on the market, and improves the quality of the packaging material. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a comparison chart of the puncture resistance and peel strength of the packaging materials obtained in Example 5 and Comparative Examples 1-2.

[0022] Figure 2 It is a comparison chart of longitudinal / transverse tear strength of the packaging materials obtained in Example 5 and Comparative Examples 1-2.

[0023] Figure 3 This is a comparison chart of the tear strength retention rate of the packaging materials obtained in Example 5 and Comparative Examples 1-2 after water immersion treatment and UV aging treatment.

[0024] Figure 4 The figure is a comparison chart of air permeability and moisture permeability of the packaging materials obtained in Example 5 and Comparative Examples 1-2. DETAILED DESCRIPTION

[0025] The present invention will be further explained below in conjunction with specific embodiments.

[0026] The polyethylene film used below was purchased from a certain environmental protection technology company in Langfang. The diameter of its micropores is 0.10 mm, and the distance between two adjacent micropores is 0.20 mm.

[0027] The polypropylene film used below was purchased from Hebei Moupeng Energy Saving Technology Co., Ltd. The diameter of its micropores is 0.40 mm, and the distance between two adjacent micropores is 1.00 mm.

[0028] Example 1 A tear-resistant and moisture-proof desiccant packaging material, comprising: a polyester non-woven fabric with a thickness of 20 μm, and a polypropylene film and a polyethylene film respectively attached to both sides of the polyester non-woven fabric. The thickness of the polypropylene film is 20 μm, the thickness of the polyethylene film is 10 μm, and the material used for the polyethylene film is linear low-density polyethylene.

[0029] The raw materials of the polyester non-woven fabric include: polyester fiber and prefabricated fiber with a diameter of 0.10 mm; the mass ratio of the polyester fiber to the prefabricated fiber is 30:20.

[0030] The polyester nonwoven fabric is prepared by the following specific operations: 100g of prefabricated fibers are dispersed on the mesh curtain of the mesh machine to form a bottom layer, 300g of polyester fibers are evenly dispersed on the surface of the bottom layer to form a middle layer, 100g of prefabricated fibers are dispersed on the surface layer, and hydroentangled for reinforcement.

[0031] The prefabricated fiber was prepared by the following specific operation: adding 100g of polyvinyl alcohol to 1000g of water, stirring at 70°C for 1h, adjusting the pH value of the system to 8-9 with a 1mol / L sodium hydroxide solution, keeping warm for 10min, adding 100g of graphene oxide and 10g of epichlorohydrin, stirring at 70°C for 1h, adjusting the system to neutral with hydrochloric acid, freeze-drying, and melt-spinning with a single-screw spinning equipment.

[0032] A method for producing tear-resistant and moisture-proof desiccant packaging material comprises the following steps: laminating a polypropylene film on one side of a polyester non-woven fabric, laminating a polyethylene film on the other side of the polyester non-woven fabric, hot pressing at 90° C. for 2 seconds with a hot pressing pressure of 0.4 MPa, and cooling to room temperature.

[0033] Example 2 A tear-resistant and moisture-proof desiccant packaging material, comprising: a polyester non-woven fabric with a thickness of 60 μm, and a polypropylene film and a polyethylene film respectively attached to both sides of the polyester non-woven fabric. The thickness of the polypropylene film is 40 μm, the thickness of the polyethylene film is 40 μm, and the material used for the polyethylene film is linear low-density polyethylene.

[0034] The raw materials of the polyester non-woven fabric include: polyester fiber and prefabricated fiber with a diameter of 0.45 mm; the mass ratio of the polyester fiber to the prefabricated fiber is 60:40.

[0035] The polyester nonwoven fabric is prepared by the following specific operations: 200g of prefabricated fibers are dispersed on the mesh curtain of the mesh machine to form a bottom layer, 600g of polyester fibers are evenly dispersed on the surface of the bottom layer to form a middle layer, 200g of prefabricated fibers are dispersed on the surface layer, and hydroentangled for reinforcement.

[0036] The prefabricated fiber was prepared by the following specific operation: adding 200g of polyvinyl alcohol to 1200g of water, stirring at 80°C for 2h, adjusting the pH value of the system to 8-9 with a 2mol / L sodium hydroxide solution, keeping warm for 30min, adding 200g of graphene oxide and 40g of epichlorohydrin, stirring at 80°C for 2h, adjusting the system to neutral with hydrochloric acid, freeze-drying, and melt-spinning with a single-screw spinning equipment.

[0037] A method for producing tear-resistant and moisture-proof desiccant packaging material comprises the following steps: laminating a polypropylene film on one side of a polyester non-woven fabric, laminating a polyethylene film on the other side of the polyester non-woven fabric, hot pressing at 100° C. for 6 seconds with a hot pressing pressure of 0.5 MPa, and cooling to room temperature.

[0038] Example 3 A tear-resistant and moisture-proof desiccant packaging material, comprising: a polyester non-woven fabric with a thickness of 25 μm, and a polypropylene film and a polyethylene film respectively attached to both sides of the polyester non-woven fabric. The thickness of the polypropylene film is 25 μm, the thickness of the polyethylene film is 15 μm, and the material used for the polyethylene film is linear low-density polyethylene.

[0039] The raw materials of the polyester non-woven fabric include: polyester fiber and prefabricated fiber with a diameter of 0.25 mm; the mass ratio of the polyester fiber to the prefabricated fiber is 40:35.

[0040] The polyester nonwoven fabric was prepared by the following specific operations: 180g of prefabricated fibers were dispersed on the mesh curtain of the mesh machine to form a bottom layer, 400g of polyester fibers were evenly dispersed on the surface of the bottom layer to form a middle layer, 170g of prefabricated fibers were dispersed on the surface layer, and hydroentangled for reinforcement.

[0041] The prefabricated fiber was prepared by the following specific operation: adding 200g of polyvinyl alcohol to 2500g of water, stirring at 73°C for 100min, adjusting the pH value of the system to 8-9 with a 1.2mol / L sodium hydroxide solution, keeping warm for 25min, adding 200g of graphene oxide and 70g of epichlorohydrin, stirring at 73°C for 100min, adjusting the system to neutral with hydrochloric acid, freeze-drying, and melt-spinning with a single-screw spinning equipment.

[0042] A method for producing tear-resistant and moisture-proof desiccant packaging material comprises the following steps: laminating a polypropylene film on one side of a polyester non-woven fabric, laminating a polyethylene film on the other side of the polyester non-woven fabric, hot pressing at 92° C. for 3 seconds with a hot pressing pressure of 0.43 MPa, and cooling to room temperature.

[0043] Example 4 A tear-resistant and moisture-proof desiccant packaging material, comprising: a polyester non-woven fabric with a thickness of 55 μm, and a polypropylene film and a polyethylene film respectively attached to both sides of the polyester non-woven fabric. The thickness of the polypropylene film is 35 μm, the thickness of the polyethylene film is 30 μm, and the material used for the polyethylene film is linear low-density polyethylene.

[0044] The raw materials of the polyester non-woven fabric include: polyester fiber and prefabricated fiber with a diameter of 0.25 mm; the mass ratio of the polyester fiber to the prefabricated fiber is 50:25.

[0045] The polyester nonwoven fabric was prepared by the following specific operations: 120 g of prefabricated fibers were dispersed on the mesh curtain of the mesh machine to form a bottom layer, 500 g of polyester fibers were evenly dispersed on the surface of the bottom layer to form a middle layer, 130 g of prefabricated fibers were dispersed on the surface layer, and hydroentangled for reinforcement.

[0046] The prefabricated fiber was prepared by the following specific operation: 120g of polyvinyl alcohol was added to 450g of water, stirred at 77°C for 80min, the pH value of the system was adjusted to 8-9 with a 1.8mol / L sodium hydroxide solution, and kept warm for 15min, 120g of graphene oxide and 9g of epichlorohydrin were added thereto, stirred at 77°C for 80min, hydrochloric acid was used to adjust the system to neutral, freeze-dried, and melt-spun using a single-screw spinning equipment.

[0047] A method for producing tear-resistant and moisture-proof desiccant packaging material comprises the following steps: laminating a polypropylene film on one side of a polyester non-woven fabric, laminating a polyethylene film on the other side of the polyester non-woven fabric, hot pressing at 98° C. for 5 seconds with a hot pressing pressure of 0.47 MPa, and cooling to room temperature.

[0048] Example 5 A tear-resistant and moisture-proof desiccant packaging material, comprising: a polyester non-woven fabric with a thickness of 40 μm, and a polypropylene film and a polyethylene film respectively attached to both sides of the polyester non-woven fabric. The thickness of the polypropylene film is 25 μm, the thickness of the polyethylene film is 32 μm, and the material used for the polyethylene film is linear low-density polyethylene.

[0049] The raw materials of the polyester non-woven fabric include: polyester fiber and prefabricated fiber with a diameter of 0.25 mm; the mass ratio of the polyester fiber to the prefabricated fiber is 45:30.

[0050] The polyester nonwoven fabric is prepared by the following specific operations: 150g of prefabricated fibers are dispersed on the mesh curtain of the mesh machine to form a bottom layer, 450g of polyester fibers are evenly dispersed on the surface of the bottom layer to form a middle layer, 150g of prefabricated fibers are dispersed on the surface layer, and hydroentangled for reinforcement.

[0051] The prefabricated fiber was prepared by the following specific operation: 150g of polyvinyl alcohol was added to 1000g of water, stirred at 75°C for 90min, the pH value of the system was adjusted to 8-9 with a 1.5mol / L sodium hydroxide solution, and kept warm for 20min, 150g of graphene oxide and 25g of epichlorohydrin were added thereto, stirred at 75°C for 90min, hydrochloric acid was used to adjust the system to neutral, freeze-dried, and melt-spun using a single-screw spinning device.

[0052] A method for producing tear-resistant and moisture-proof desiccant packaging material comprises the following steps: laminating a polypropylene film on one side of a polyester non-woven fabric, laminating a polyethylene film on the other side of the polyester non-woven fabric, hot pressing at 95° C. for 2 seconds with a hot pressing pressure of 0.45 MPa, and cooling to room temperature.

[0053] Comparative Example 1 A tear-resistant and moisture-proof desiccant packaging material, comprising: a polyester non-woven fabric with a thickness of 40 μm, and a polypropylene film and a polyethylene film respectively attached to both sides of the polyester non-woven fabric. The thickness of the polypropylene film is 25 μm, the thickness of the polyethylene film is 32 μm, and the material used for the polyethylene film is linear low-density polyethylene.

[0054] The raw materials of the polyester non-woven fabric include: polyester fiber and prefabricated fiber with a diameter of 0.25 mm; the mass ratio of the polyester fiber to the prefabricated fiber is 45:30.

[0055] The polyester nonwoven fabric is prepared by the following specific operations: 150g of prefabricated fibers are dispersed on the mesh curtain of the mesh machine to form a bottom layer, 450g of polyester fibers are evenly dispersed on the surface of the bottom layer to form a middle layer, 150g of prefabricated fibers are dispersed on the surface layer, and hydroentangled for reinforcement.

[0056] The prefabricated fiber was prepared by the following specific operation: 150g of polyvinyl alcohol was added to 1000g of water, stirred at 75°C for 90min, the pH value of the system was adjusted to 8-9 with a 1.5mol / L sodium hydroxide solution, and kept warm for 20min, 150g of nano-silicon dioxide and 25g of epichlorohydrin were added thereto, stirred at 75°C for 90min, hydrochloric acid was used to adjust the system to be neutral, freeze-dried, and melt-spun using a single-screw spinning device.

[0057] A method for producing tear-resistant and moisture-proof desiccant packaging material comprises the following steps: laminating a polypropylene film on one side of a polyester non-woven fabric, laminating a polyethylene film on the other side of the polyester non-woven fabric, hot pressing at 95° C. for 2 seconds with a hot pressing pressure of 0.45 MPa, and cooling to room temperature.

[0058] Comparative Example 2 A tear-resistant and moisture-proof desiccant packaging material, comprising: a polyester non-woven fabric with a thickness of 40 μm, and a polypropylene film and a polyethylene film respectively attached to both sides of the polyester non-woven fabric. The thickness of the polypropylene film is 25 μm, the thickness of the polyethylene film is 32 μm, and the material used for the polyethylene film is linear low-density polyethylene.

[0059] The polyester nonwoven fabric is prepared by the following specific operation: 450 g of polyester fibers are evenly dispersed on a mesh curtain of a mesh machine, and then reinforced by hydroentanglement.

[0060] A method for producing tear-resistant and moisture-proof desiccant packaging material comprises the following steps: laminating a polypropylene film on one side of a polyester non-woven fabric, laminating a polyethylene film on the other side of the polyester non-woven fabric, hot pressing at 95° C. for 2 seconds with a hot pressing pressure of 0.45 MPa, and cooling to room temperature.

[0061] The puncture resistance of the packaging materials obtained in Example 5 and Comparative Examples 1-2 was measured with reference to GB / T 37841-2019 “Test method for puncture resistance of plastic films and sheets”.

[0062] The peel strength of the packaging materials obtained in Example 5 and Comparative Examples 1-2 was measured with reference to GB / T 8808-1988 "Peel test method for soft composite plastic materials".

[0063] like Figure 1 As shown, the puncture resistance and peel strength of the packaging material obtained in Example 5 are the highest, which are better than those of Comparative Examples 1-2 (P < 0.05).

[0064] The longitudinal and transverse tear strengths of the packaging materials obtained in Example 5 and Comparative Examples 1-2 were measured with reference to QB / T 1130-1991 "Test Method for Right-Angled Tear Properties of Plastics".

[0065] like Figure 2 As shown, the longitudinal and transverse tear strengths of the packaging material obtained in Example 5 are both the highest, which is better than that of Comparative Examples 1-2 (P < 0.05).

[0066] The packaging materials obtained in Example 5 and Comparative Examples 1-2 were completely immersed in deionized water for 24 hours, and then taken out to test their tear strength, and the tear strength retention rate was calculated.

[0067] With reference to GB / T 16422.3-2022 "Plastics Laboratory Light Source Exposure Test Method Part 3: Fluorescent Ultraviolet Lamp", the packaging materials obtained in Example 5 and Comparative Examples 1-2 were subjected to UV aging treatment, and then their tear strength was tested, and the tear strength retention rate was calculated.

[0068] Tear strength retention rate = tear strength after treatment ÷ original tear strength × 100% like Figure 3 As shown, the tear strength retention rate of the packaging material obtained in Example 5 after treatment is the highest, which is better than that of Comparative Examples 1-2 (P<0.05).

[0069] The air permeability of the packaging materials obtained in Example 5 and Comparative Examples 1-2 was then tested according to ISO5636 / 5; and the moisture permeability of the packaging materials obtained in Example 5 and Comparative Examples 1-2 was then tested according to Condition A in ASTME96 / E96M.

[0070] like Figure 4 As shown, the air permeability of the packaging material obtained in Example 5 is the highest, which is better than that of Comparative Examples 1-2 (P<0.05), indicating that the air permeability of the packaging material obtained in Example 5 is the worst; and the moisture permeability of the packaging material obtained in Example 5 is the highest, which is better than that of Comparative Examples 1-2 (P<0.05), indicating that the moisture permeability of the packaging material obtained in Example 5 is the best; it is confirmed that the packaging material obtained in Example 5 is suitable for the packaging of desiccant.

[0071] The applicant believes that this is because the present invention uses graphene oxide grafted on polyvinyl alcohol, which can significantly enhance the stability of the prefabricated fiber under the action of epichlorohydrin, and a large amount of lamellar graphene is combined inside, so the prefabricated fiber not only has excellent air permeability and moisture permeability, but also can maintain excellent mechanical strength of the system after absorbing water. The present invention lays polyester fiber in the middle and lays prefabricated fibers on both sides to prepare polyester non-woven fabrics, so that the polyester non-woven fabrics not only have good hot pressing effects with polypropylene film and polyethylene film, but also have extremely high mutual bonding strength, high heat sealing strength, good tear resistance, and excellent tear resistance even in a humid environment. At the same time, it can significantly enhance the anti-ultraviolet function of the packaging material and effectively prevent the aging phenomenon of the desiccant packaging.

[0072] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A tear-resistant and moisture-proof desiccant packaging material, characterized in that: include: A polyester non-woven fabric, and a polypropylene film and a polyethylene film respectively attached to both sides of the polyester non-woven fabric; wherein the polypropylene film and the polyethylene film are both provided with through holes; The raw materials of the polyester non-woven fabric include: polyester fiber and prefabricated fiber; the mass ratio of the polyester fiber to the prefabricated fiber is 30-60:20-40.

2. The tear-resistant and moisture-proof desiccant packaging material according to claim 1, characterized in that: The thickness of the polyester nonwoven fabric is 20-60 μm, the thickness of the polypropylene film is 20-40 μm, and the thickness of the polyethylene film is 10-40 μm.

3. The tear-resistant and moisture-proof desiccant packaging material according to claim 1, characterized in that: The material used for polyethylene film is linear low-density polyethylene.

4. The tear-resistant and moisture-proof desiccant packaging material according to claim 1, characterized in that: The polyester nonwoven fabric is produced by the following specific operations: prefabricated fibers are dispersed on the mesh curtain of the mesh machine to form a bottom layer, polyester fibers are evenly dispersed on the surface of the bottom layer to form a middle layer, and then prefabricated fibers are dispersed on the surface of the middle layer to form a surface layer, and hydroentangled to reinforce.

5. The tear-resistant and moisture-proof desiccant packaging material according to claim 4, characterized in that: The mass ratio of the prefabricated fibers used in the bottom layer to the prefabricated fibers used in the surface layer is 10-20:10-20.

6. The tear-resistant and moisture-proof desiccant packaging material according to claim 4, characterized in that: The diameter of the prefabricated fibers is 0.10-0.45 mm.

7. The tear-resistant and moisture-proof desiccant packaging material according to claim 1, characterized in that: The prefabricated fiber is prepared by the following specific operation: adding polyvinyl alcohol to water, stirring at 70-80°C for 1-2 hours, adjusting the pH value of the system to 8-9, keeping warm for 10-30 minutes, adding graphene oxide and epichlorohydrin, stirring at 70-80°C for 1-2 hours, adjusting the system to be neutral, freeze-drying, and melt-spinning.

8. The tear-resistant and moisture-proof desiccant packaging material according to claim 7, characterized in that: The mass ratio of polyvinyl alcohol, graphene oxide and epichlorohydrin is 1-5:1-5:0.1-1.

9. The method for producing the tear-resistant and moisture-proof desiccant packaging material according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: sticking a polypropylene film on one side of a polyester non-woven fabric, sticking a polyethylene film on the other side of the polyester non-woven fabric, hot pressing, and cooling to room temperature.

10. The method for producing the tear-resistant and moisture-proof desiccant packaging material according to claim 9, characterized in that: The hot pressing temperature is 90-100°C, the hot pressing pressure is 0.4-0.5MPa, and the hot pressing time is 2-6s.

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