Composite film material for warehouse and preparation method thereof, warehouse

Abstract

The present invention provides a composite film material for warehouses, a preparation method thereof, and a warehouse. The composite film material for warehouses comprises a metal barrier layer and a PVC film material stacked in sequence. The PVC film material is made using a polyester fiber mesh as a substrate. The preparation method of the composite film material comprises: preparing the metal barrier layer; preparing the PVC film material; and laminating the metal barrier layer to the surface of the PVC film material. The composite film material provides high barrier properties and is rat-resistant.

Description

Technical Field

[0001] The present invention relates to the field of membrane materials in engineering structures, and in particular to a composite membrane material for warehouses, a preparation method thereof, and a warehouse. Background Art

[0002] The main body of the granary in the prior art basically adopts a brick-concrete structure or a brick-wood structure or a metal structure. In order to solve the technical problems of mildew prevention, fog (moisture prevention), insect prevention, aging prevention, and rodent prevention in the field of grain storage, auxiliary structures need to be designed separately. This not only makes the granary structure more and more complicated, but also makes the construction time-consuming, labor-intensive, and costly, and difficult to be suitable for farmers' families. With the transfer of rural land, there are more and more large grain growers, and the amount of rice and other grains harvested is also increasing; due to the lack of appropriate grain storage equipment, a lot of grain is still directly piled on the ground, that is, "ground grain", resulting in losses such as mildew and rat gnawing. It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to ordinary technicians in this field. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and to provide a composite membrane material, a preparation method thereof, and a warehouse. The composite membrane material is used as the main material of the storage cavity of a warehouse such as a granary, and can improve the moisture and mildew resistance of the warehouse.

[0004] According to a first aspect of the present invention, a composite film is provided, comprising a metal barrier layer and a PVC film stacked in sequence, wherein the PVC film is prepared using a polyester fiber mesh as a base material.

[0005] According to one embodiment of the present invention, the metal barrier layer includes a metal foil layer, and the metal foil layer is bonded to the PVC film material; the thickness of the metal foil layer is not less than 10 microns.

[0006] According to one embodiment of the present invention, the metal foil layer is an aluminum foil layer, a copper foil layer, an iron foil layer or a tin foil layer.

[0007] According to one embodiment of the present invention, the metal foil layer and the PVC film are bonded via a glue layer; the glue of the glue layer is a mixed glue of polyester resin and ethyl acetate, and the thickness of the glue layer is 5 to 10 microns.

[0008] According to one embodiment of the present invention, the metal barrier layer further comprises a PET layer and a PE layer sequentially stacked on a side of the metal foil layer away from the PVC film material.

[0009] According to one embodiment of the present invention, the thickness of the PE layer is 80 to 100 micrometers, and the thickness of the PET layer is 10 to 20 micrometers.

[0010] According to one embodiment of the present invention, the PVC membrane material includes a PVC mesh cloth layer and a surface treatment layer located on a side of the PVC mesh cloth layer away from the metal barrier layer.

[0011] According to one embodiment of the present invention, the material of the surface treatment layer includes polyvinylidene fluoride or polymethyl methacrylate.

[0012] According to one embodiment of the present invention, the thickness of the surface treatment layer is not less than 5 g / m2.

[0013] According to one embodiment of the present invention, the PVC mesh cloth layer includes a surface PVC adhesive layer, a polyester fiber mesh cloth and a bottom PVC adhesive layer that are stacked.

[0014] According to one embodiment of the present invention, the surface PVC adhesive layer and the bottom PVC adhesive layer contain rodent repellent.

[0015] According to one embodiment of the present invention, the mass content of the rodent repellent in the surface PVC adhesive layer and the bottom PVC adhesive layer is between 0.5% and 5.0%.

[0016] According to a second aspect of the present invention, there is provided a method for preparing a composite film material, comprising:

[0017] preparing a metal barrier layer;

[0018] Preparation of PVC membrane materials;

[0019] The metal barrier layer is attached to the surface of the PVC film.

[0020] According to one embodiment of the present invention, the preparation of the metal barrier layer includes:

[0021] Laminating a PET layer on the surface of the metal foil layer;

[0022] The PE layer is laminated on the surface of the PET layer to obtain the metal barrier layer.

[0023] According to one embodiment of the present invention, the preparation of the PVC film material includes:

[0024] Prepare a PVC mesh layer, wherein the PVC mesh layer comprises a top PVC adhesive layer, a polyester fiber mesh, and a bottom PVC adhesive layer stacked in layers;

[0025] Polyvinylidene fluoride or polymethyl methacrylate is applied to the bottom PVC adhesive layer of the PVC mesh cloth membrane material, and dried at 145-160° C. for 30-60 seconds to obtain a surface treatment layer formed on the surface of the bottom PVC adhesive layer.

[0026] According to one embodiment of the present invention, laminating the metal barrier layer to the surface of the PVC film material includes:

[0027] Applying a layer of glue on the surface of the PVC adhesive layer;

[0028] The metal foil layer and the glue layer are extruded and laminated.

[0029] According to a third aspect of the present invention, a warehouse is provided, comprising the composite membrane material.

[0030] According to one embodiment of the present invention, the warehouse is a granary or a fresh-keeping warehouse.

[0031] The beneficial effects are as follows:

[0032] (1) The present invention utilizes a high-barrier composite film material to form a storage cavity for a warehouse or granary, and is used in warehouses where internal storage needs to be shielded from gas and moisture.

[0033] (2) According to some embodiments, the composite membrane material of the present invention is used as a membrane material for the storage cavity of a warehouse or a granary. There is no need to use brick-concrete structure, brick-wood structure, metal structure or the like to build the warehouse, nor is there any need to design auxiliary structures separately for the functions of mildew-proof, moisture-proof, rodent-proof, insect-proof, anti-aging and the like for the stored goods (such as grains or fruits and vegetables), thereby reducing the cost of the warehouse. Of course, it is not limited to being used in granaries or fresh-keeping warehouses, but can also be used as a membrane material for the storage cavity in warehouses where the internal storage needs to be isolated from gas and moisture.

[0034] (3) According to some embodiments, the composite film material of the present invention has a long service life and can be used for at least 20 years without damage. It has rodent and insect-proof capabilities, avoids damage to the composite film material due to rodent biting, and has low storage environment requirements.

[0035] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings are incorporated into and constitute a part of this specification, illustrate embodiments consistent with the present invention, and together with the description, serve to explain the principles of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and it is clear that those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0037] Figure 1 Schematic diagram of the stacked structure of the composite film material in one embodiment of the present invention.

[0038] Figure 2 This is a photo of the composite film without added capsaicin after one day of rat bite experiment.

[0039] Figure 3 This is a photo of the composite film without added capsaicin after two days of rat bite experiment.

[0040] Figure 4 This is a photo of the composite film without added capsaicin after three days of rat bite experiment.

[0041] Figure 5 This is a photo of the composite film material with 1% capsaicin added after three days of rat bite experiment.

[0042] Figure 6 It is a schematic diagram of the composite film material of the present invention during the bonding effect test. DETAILED DESCRIPTION

[0043] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent identical or similar structures, and thus their detailed description will be omitted. Furthermore, the figures are merely schematic illustrations of the present invention and are not necessarily drawn to scale.

[0044] Although relative terms such as "upper" and "lower" are used in this specification to describe the relationship of one illustrated component to another, these terms are used herein for convenience only, such as in accordance with the orientation of the illustrations in the accompanying drawings. It will be understood that if the illustrated device were flipped upside down, the component described as "upper" would become the component "lower." When a structure is referred to as "on" another structure, this may mean that the structure is integrally formed with the other structure, that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via the other structure.

[0045] The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express open-ended inclusion and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc.; the terms "first", "second", etc. are used only as labels and are not intended to limit the quantity of their objects.

[0046] The embodiments of the present invention provide a composite film material and a warehouse using the composite film material, in particular a granary or a fresh-keeping warehouse using the composite film material.

[0047] See also Figure 1, the composite film material includes a metal barrier layer XA and a PVC (polyvinyl chloride) film material XB stacked in sequence. In one embodiment of the present disclosure, the PVC film material is prepared using a polyester fiber mesh as a base material. In the composite film material of the embodiment of the present invention, the metal barrier layer XA can play a role in isolating the air and moisture on one side of the composite film material from entering the other side. When used in a warehouse, it can prevent air and moisture outside the warehouse from penetrating into the warehouse, thereby enabling the environment inside the warehouse to have a higher stability. In particular, when the warehouse is a granary, the metal barrier layer XA can prevent external air and moisture from entering the granary, thereby helping to prevent moisture and mildew in the grain in the granary.

[0048] In one example, in a warehouse or a component thereof, the metal barrier layer XA may face inward (eg, toward the inside of the warehouse or toward the inside of the component), and the PVC film material XB may face outward of the warehouse or its component.

[0049] In some embodiments of the present invention, the metal barrier layer XA comprises a metal foil layer 3, which is bonded to the PVC film XB. This dense metal foil layer 3, with its closely packed metal molecules and small gaps, can block the two sides of the composite film, for example, preventing air from penetrating between the two sides of the composite film.

[0050] Optionally, the metal in the metal foil layer 3 may be a single metal or a metal alloy. For example, the metal foil layer 3 may be any one of an aluminum foil layer, a copper foil layer, an iron foil layer, a tin foil layer, and the like. In one embodiment of the present invention, the metal foil layer 3 is an aluminum foil layer, a copper foil layer, an iron foil layer, or a tin foil layer to reduce the cost of the metal foil layer 3. In one example, the metal foil layer 3 is an aluminum foil layer.

[0051] Optionally, the thickness of the metal foil layer 3 is not less than 10 microns, so that the composite film has good air barrier properties. After extensive testing, it was found that when the thickness of the metal foil layer 3 is not less than 10 microns, the composite film has an air barrier effect of more than 99%.

[0052] In one example, the thickness of the metal foil layer 3 is 10 to 20 microns (e.g., 10 microns, 12 microns, 14 microns, 16 microns, 18 microns, or 20 microns). This allows the thickness of the metal foil layer 3 to be minimized while ensuring the gas barrier effect of the metal barrier layer XA, thereby reducing the cost, weight, and thickness of the composite film.

[0053] In one embodiment of the present invention, the metal foil layer 3 and the PVC film material XB are bonded together via a glue layer 4. In one example, the glue of the glue layer 4 is a mixed glue of polyester resin and ethyl acetate.

[0054] Further, the glue of glue layer 4 is high molecular weight polyester resin and ethyl acetate mixed glue. Of course, the glue adopted by glue layer 4 can also be other types of glue.

[0055] In one example, the glue layer 4 has a thickness of 5 to 10 microns (eg, 5 microns, 7.5 microns, 10 microns), so that the glue layer 4 has good weather resistance, UV resistance, and good adhesion.

[0056] In one embodiment of the present invention, the metal barrier layer XA further comprises a PE layer (polyethylene layer) 1 located on the side of the metal foil layer 3 facing away from the PVC film XB. The PE layer 1 is connected to the metal foil layer 3 via the PET layer (polyethylene terephthalate layer) 2. In other words, the metal barrier layer XA further comprises a PET layer 2 and a PE layer 1 sequentially stacked on the side of the metal foil layer 3 facing away from the PVC film XB. Thus, the PET layer 2 and the PE layer 1 provide protection for the metal foil layer 3, thereby improving the lifespan of the composite film and its gas barrier properties.

[0057] In embodiments of the present invention, extensive testing has revealed that a thickness of at least 80 microns for the PE layer 1 and at least 10 microns for the PET layer 2 provides excellent protection for the metal barrier layer XA. Thus, in embodiments of the present invention, the thickness of the PE layer 1 can be at least 80 microns, and the thickness of the PET layer 2 can be at least 10 microns. In one example, the thickness of the PE layer 1 is 80 to 100 microns (e.g., 80, 90, or 100 microns), and the thickness of the PET layer 2 is 10 to 20 microns (e.g., 10, 15, or 20 microns). This allows the PE layer 1 and PET layer 2 to have relatively small thicknesses while maintaining effective protection for the metal foil layer 3, thereby reducing the cost, weight, and thickness of the composite film.

[0058] In one embodiment of the present invention, the metal barrier layer XA can be prepared by laminating the PET layer 2 to the metal foil layer 3, and then laminating the PE layer 1 onto the PET layer 2 (on the surface of the PET layer facing away from the metal foil layer 3). The resulting metal barrier layer XA thus comprises the metal foil layer 3, the PET layer 2, and the PE layer 1, which are sequentially laminated.

[0059] In one embodiment of the present invention, the PET layer 2 and the metal foil layer 3 are bonded together by polyurethane glue, and the glue is cured.

[0060] In one embodiment of the present invention, the PET layer 2 and the PE layer 1 are bonded together by polyurethane glue, and the glue is cured.

[0061] In one embodiment of the present invention, the PVC membrane material XB comprises a laminated PVC mesh layer and a surface-treated layer 8 located on the side of the PVC mesh layer facing away from the metal barrier layer. The surface-treated layer 8 can have high wear resistance and stain resistance, resulting in an anti-fouling and self-cleaning effect. Of course, the surface-treated layer 8 is not limited to the aforementioned properties and can also have weather resistance or mildew resistance, depending on the application scenario.

[0062] In one embodiment of the present invention, the PVC film can contain a rodent repellent. For example, the PVC mesh layer can contain a rodent repellent. This repellent can stimulate the oral mucosa and taste nerves of rodents, causing them to dislike chewing, thereby achieving the purpose of rodent repellence. For example, the odor of the repellent can disgust rodents and drive them away. In this way, the composite film has rodent-proofing capabilities. In some cases, the repellent can also have an insect-proofing effect, for example, preventing termites from gnawing. Thus, the composite film has insect-proofing capabilities.

[0063] In the composite film of this embodiment, a surface treatment layer 8 is provided on the side of the PVC mesh layer away from the metal barrier layer XA. This surface treatment layer 8 prevents the PVC mesh layer from being exposed and prevents the odor of the rodent repellent from being transmitted to the operator within a safe distance, causing discomfort such as a pungent nasal discharge and tearing eyes. The surface treatment layer 8 does not affect the transmission of the rodent repellent's odor to the surface of the composite film. When animals such as mice approach the composite film, they are irritated by the rodent repellent and do not bite the composite film, thereby giving the composite film the ability to repel rodents and preventing damage to the composite film from being bitten by rodents. The storage environment requirements are low and the composite film can be used for at least 20 years without damage. At the same time, the surface treatment layer 8 prevents the rodent repellent from being exposed, thereby preventing skin irritation and damage when people come into contact with it. In this way, the composite film of the present invention, by providing a surface treatment layer, not only improves the safety of the composite film for operators and stored goods, but also achieves the effect of repelling and preventing rodents.

[0064] When this composite film material is used in a warehouse, it can also make the warehouse rat-proof and insect-proof. This not only improves the rat-proof effect of the warehouse's internal space, but also reduces the risk of damage to the warehouse by preventing rats from biting. In this way, the storage inside the warehouse is protected and prevented from rodent damage; the warehouse film material avoids damage to the metal barrier layer XA due to its rat-proofing, thereby maintaining high barrier properties of the composite film material; because the composite film material is rat-proof, it avoids overall structural damage caused by local damage to the composite film material. For example, when the warehouse is a granary, the granary can achieve a rat-proof effect by adopting the composite film material in the embodiment of the present invention. There is no need to set up additional complex rat-proof and insect-proof facilities, which would make the granary structure complex and costly, and it can facilitate the rapid construction and recovery of the granary. Not only that, warehouse workers and warehouse storage will not be exposed to the risk of contact with rodent repellents, avoiding discomfort to workers and contamination of warehouse storage by rodent repellents.

[0065] The composite film material of the embodiment of the present invention can be used to quickly build a warehouse. There is no need to build the warehouse using brick-concrete structure, brick-wood structure and metal structure. There is no need to design auxiliary structures separately for the functions of mildew, moisture, rodent, insect and aging of the stored materials (such as grain or fruits and vegetables), which reduces the cost of the warehouse. In particular, when the warehouse is a temporary or periodic facility, for example, when the warehouse is a non-permanent granary such as a granary used for outdoor or temporary storage of grain by farmers, a composite film material can be used to enclose the granary's accommodating cavity to store grain, blocking gas and moisture from entering the accommodating cavity to cause the grain to mold, and can be repeatedly built and recycled. This effectively reduces the cost of the granary, increases the speed of construction, increases the flexibility of the granary construction location, etc., and is particularly suitable for large grain growers, for example, those who need to harvest and temporarily store 5 to 300 tons of grain. It is understandable that the composite film material of the embodiment of the present invention can be used to quickly build warehouses of different sizes or shapes according to the different needs of users to meet the storage needs and adopt the composite film material of the present invention.

[0066] In one example, in a warehouse, the PVC film XB is positioned outside the metal barrier layer XA. That is, the metal barrier layer XA is closer to the inside of the warehouse than the PVC film XB. This way, even if a rat accidentally damages the PVC film XB before giving up, the warehouse remains isolated from the outside environment by the metal barrier layer XA, maintaining its functionality, such as preventing gas leaks and maintaining moisture and mildew resistance. Furthermore, the metal barrier layer XA completely blocks the rodent repellent in the PVC mesh fabric, preventing it from contaminating stored goods, such as grain in a granary.

[0067] In one embodiment of the present invention, the PVC mesh fabric layer may include a top PVC adhesive layer 5 (i.e., a top polyvinyl chloride adhesive layer), a polyester fiber mesh 6, and a bottom PVC adhesive layer 7 (i.e., a bottom polyvinyl chloride adhesive layer) stacked in sequence. The top PVC adhesive layer 5 and the bottom PVC adhesive layer 7 may be made of the same or different materials. At least one of the top PVC adhesive layer 5 and the bottom PVC adhesive layer 7 may contain a rodent repellent, such as a bittering agent or a spicy agent, or other additive that produces a noticeable taste discomfort in rodents.

[0068] In one example, the rodent repellent in the PVC mesh layer is capsaicin. This way, capsaicin can stimulate the oral mucosa and taste nerves of rodents to make them dislike chewing, thereby achieving the purpose of rodent repellence. Capsaicin also has a certain pungent smell, which can stimulate the animal's sense of smell and make rodents avoid it. Furthermore, the pungent taste of capsaicin also has a repellent or killing effect on other animals or insects. For example, it can prevent wild animals such as hares from biting the composite film material, or kill insects such as termites that gnaw on the composite film material. In this way, the composite film material of the present invention can have multiple protective capabilities such as rodent repellence, insect repellence, and rabbit repellence. In particular, the PVC mesh layer of the composite film material is sandwiched between the metal barrier layer XA and the surface treatment layer 8, so it is not directly exposed and has a higher safety. Therefore, its protective ability against animals and insects can be improved by increasing the amount of rodent repellent used.

[0069] In one embodiment of the present invention, a rodent-proofing PVC paste can be prepared first, and then the rodent-proofing PVC paste can be used to prepare the rodent-proofing surface PVC adhesive layer 5 and the bottom PVC adhesive layer 7. This ensures that the rodent-proofing PVC paste is evenly distributed in the surface PVC adhesive layer 5 and the bottom PVC adhesive layer 7. Of course, if the surface PVC adhesive layer 5 or the bottom PVC adhesive layer 7 does not contain rodent-proofing, the rodent-proofing surface PVC adhesive layer 5 or the bottom PVC adhesive layer 7 can be prepared using the rodent-proofing PVC paste; the rodent-proofing surface PVC adhesive layer 5 or the bottom PVC adhesive layer can be prepared using the rodent-proofing PVC paste; the rodent-proofing surface PVC adhesive layer 5 or the bottom PVC adhesive layer can be prepared using the rodent-proofing PVC paste.

[0070] Optionally, the rodent repellent content of the PVC paste containing the rodent repellent is 0.5% to 5%, for example, between 0.5% and 1.5%. Furthermore, considering that the surface treatment layer 8 shields the PVC mesh layer, the rodent repellent can have a higher mass ratio to improve the rodent repellent effect without worrying about contamination of stored goods or harm to workers. For example, the protection rate against rodent bites can be increased to over 99%. Furthermore, the rodent repellent content of the PVC paste containing the rodent repellent can be no less than 1.5%, for example, between 2% and 5%.

[0071] In one example, both the top PVC adhesive layer 5 and the bottom PVC adhesive layer 7 contain rodent repellent.

[0072] In one example, the surface PVC adhesive layer 5 and the bottom PVC adhesive layer 7 are made of the same material.

[0073] In one example, the surface PVC adhesive layer 5 is located on a side of the bottom PVC adhesive layer 7 close to the metal barrier layer XA; wherein the thickness of the surface PVC adhesive layer 5 is not less than the thickness of the bottom PVC adhesive layer 7 .

[0074] In one example, the thickness of the surface PVC adhesive layer 5 is between 350 microns and 500 microns. After a large number of experiments, it was verified that the thickness of the surface PVC adhesive layer 5 is too thin, the contact surface between the metal barrier layer XA and the surface PVC adhesive layer 5 is not well fitted, and if it is too thick, the cost of the composite film material is increased.

[0075] In one example, the thickness of the bottom PVC adhesive layer 7 is between 200 microns and 350 microns. After a large number of experimental verifications, it was found that if the thickness of the bottom PVC adhesive layer 7 is too thin, the contact surface between the surface treatment layer 8 and the bottom PVC adhesive layer 7 will not fit well. If it is too thick, the cost of the composite film material will be increased.

[0076] In the embodiments of the present invention, extensive experiments have demonstrated that the top PVC adhesive layer 5 allows for better adhesion of the metal barrier layer XA to the polyester fiber mesh. The bottom PVC adhesive layer 7 allows for better adhesion of the surface treatment layer 8 to the polyester fiber mesh. The polyester fiber mesh enables the composite membrane material of the embodiments of the present invention to have a high in-plane tensile bearing capacity, thereby meeting the tensile strength requirements of membrane materials for engineering structures.

[0077] In some embodiments of the present invention, the PVC paste containing a rodent repellent may include a rodent repellent, polyvinyl chloride, a blending resin, a plasticizer, a heat stabilizer, a stabilizer, a flame retardant, a filler, a flame retardant filler, a mildewcide, a UV absorber, and an antioxidant. Of course, new materials may be added or reduced as needed depending on performance requirements.

[0078] In one embodiment of the present invention, the PVC paste without a rodent repellent does not contain a rodent repellent, compared to the PVC paste with a rodent repellent. Furthermore, the components and the content of each component in the PVC paste without a rodent repellent are the same as the components and content of the components other than the rodent repellent in the PVC paste with a rodent repellent.

[0079] In one example, the plasticizer may be diisononyl phthalate.

[0080] In one example, the thermal stabilizer may be a barium zinc stabilizer or a calcium zinc stabilizer.

[0081] In one example, the stabilizer may be soybean oil, and in particular, may be epoxidized soybean oil.

[0082] In one example, the flame retardant may be antimony oxide.

[0083] In one example, the filler may be heavy calcium carbonate to reduce the cost of the composite film material and increase the hardness of the composite film material.

[0084] In one example, the flame retardant filler can be aluminum hydroxide. In this way, the flame retardant filler can not only be flame retardant, but also serve as a filler and smoke suppressant, thereby reducing the cost of the composite film material while improving the safety of the warehouse.

[0085] In one embodiment of the present invention, PVC paste (polyvinyl chloride paste), in addition to the rodent repellent, also includes: 80-85 parts of polyvinyl chloride, 15-20 parts of blending resin, 65-75 parts of plasticizer, 2.5-3.5 parts of heat stabilizer, 1-2 parts of stabilizer, 6-12 parts of flame retardant, 20-35 parts of filler, 10-15 parts of flame retardant filler, 2-2.5 parts of mildewproofing agent, 0.8-1.5 parts of ultraviolet absorber, and 0.4-0.6 parts of antioxidant.

[0086] In one example, in the PVC paste, except for the rodent repellent, the mass parts of each component are: 80 parts of polyvinyl chloride, 15 parts of blending resin, 65 parts of diisononyl phthalate, 2.5 parts of heat stabilizer, 1 part of soybean oil, 6 parts of antimony oxide, 20 parts of heavy calcium, 10 parts of aluminum hydroxide, 2 parts of mildew inhibitor, 0.8 parts of ultraviolet absorber, and 0.4 parts of antioxidant.

[0087] Alternatively, capsaicin can be dissolved in diisononyl phthalate, for example, by heat-treating the mixture of capsaicin and diisononyl phthalate at 60-80° C. until a liquid is obtained, and then mixing it with other components in the PVC paste (such as polyvinyl chloride, blending resin, heat stabilizer, stabilizer, flame retardant, filler, flame retardant filler, mildewproofing agent, ultraviolet absorber and antioxidant) to obtain a PVC paste with rodent repellent.

[0088] Furthermore, the PVC paste with rodent repellent consists of polyvinyl chloride, blended resin, diisononyl phthalate, heat stabilizer, soybean oil, antimony oxide, heavy calcium, aluminum hydroxide, mildew preventer, ultraviolet absorber, antioxidant and rodent repellent.

[0089] In one embodiment of the present invention, the preparation method of the PVC mesh fabric layer may include three steps: coating and priming, pre-plasticization and plasticization.

[0090] During the priming step, PVC paste can be applied to the polyester mesh and pre-plasticized for the first time to complete the priming process. The PVC paste used in the priming step can be either rodent-proof or rodent-proof. Whether the PVC paste in the priming step contains rodent-proof depends on the rodent-proof content required for the entire PVC mesh layer. During the pre-plasticizing and plasticizing steps, PVC paste can be applied to both sides of the primed polyester mesh to ultimately form a surface PVC adhesive layer 5 and a bottom PVC adhesive layer 7, respectively.

[0091] Specifically, during the priming step, PVC paste can be applied to the polyester mesh so that the PVC paste completely fills the gaps between the meshes; pre-plasticization is then performed. During the pre-plasticization step, a further layer of PVC paste can be applied to one side (e.g., side A) of the primed polyester mesh, followed by pre-plasticization. During the plasticization step, PVC paste can be applied to the other side (e.g., side B) of the pre-plasticized polyester mesh, followed by plasticization to form a PVC mesh layer.

[0092] In one example, in the coating priming step, the PVC paste is coated on the polyester fiber mesh by a coating process (eg, a coating method).

[0093] In one example, during the priming step, when applying the PVC paste to the polyester mesh, the PVC paste is applied to both sides of the polyester mesh simultaneously. After the PVC paste is applied to both sides of the polyester mesh simultaneously, a first pre-plasticization is performed. Optionally, the first pre-plasticization time is 30 to 60 seconds, and the first pre-plasticization temperature is 140 to 160°C. For example, the first pre-plasticization time is 30 seconds, and the first pre-plasticization temperature is 160°C. For another example, the first pre-plasticization time is 40 seconds, and the first pre-plasticization temperature is 155°C. For another example, the first pre-plasticization time is 60 seconds, and the first pre-plasticization temperature is 140°C.

[0094] In one example, in the coating and priming step, when PVC paste is simultaneously coated on both sides of the polyester fiber mesh, the single-sided coating amount of PVC paste is 80 to 200 g / m2 (e.g., 80 g / m2, 120 g / m2, 160 g / m2, 200 g / m2).

[0095] In one example, in the pre-plasticization step, the coating amount of the PVC paste is 200-500 g / m2 (e.g., 200 g / m2, 300 g / m2, 400 g / m2, 500 g / m2). In this way, the coated PVC paste can eventually form a part of the bottom PVC adhesive layer 7.

[0096] In one example, in the pre-plasticizing step, the second pre-plasticizing time is 30 to 60 seconds, and the second pre-plasticizing temperature is 160 to 175°C.

[0097] In one example, in the plasticizing step, the coating amount of the PVC paste is 200-700 g / m2 (e.g., 200 g / m2, 300 g / m2, 400 g / m2, 500 g / m2, 600 g / m2, 700 g / m2). In this way, the coated PVC paste can eventually form a part of the surface PVC adhesive layer 5.

[0098] In one example, in the plasticizing step, the plasticizing temperature is 180-210°C.

[0099] In one example, in the plasticizing step, the plasticizing time is 1 to 2 minutes.

[0100] It is understandable that the components and coating amounts of the PVC paste applied in the three steps of coating and priming, pre-plasticizing and plasticizing can be determined according to the components of the corresponding film layer to be formed. When a certain film layer is not doped with a rodent repellent, the PVC paste applied in the step of forming the film layer can be a PVC paste that does not contain a rodent repellent. In one example of the present invention, the components of the PVC paste applied in the three steps of coating and priming, pre-plasticizing and plasticizing are the same, and are all PVC pastes containing a rodent repellent. In this way, on the one hand, the PVC mesh cloth layer can have a more sufficient and lasting rodent repellent effect, and the preparation process of the PVC mesh cloth layer can be simplified to reduce the cost of the PVC mesh cloth layer, and ultimately reduce the cost of the composite film material.

[0101] Optionally, the material of the surface treatment layer 8 includes polyvinylidene fluoride or polymethyl methacrylate, and in particular, can include modified polyvinylidene fluoride. Thus, the surface treatment layer 8 can be a polyvinylidene fluoride layer or a polymethyl methacrylate layer. For example, a coating primarily composed of modified polyvinylidene fluoride or polymethyl methacrylate can be applied or sprayed onto the side of the PVC mesh fabric layer away from the metal barrier layer XA to form the surface treatment layer 8.

[0102] Optionally, the thickness of the surface treatment layer 8 is not less than 5 g / m2, so that the surface treatment layer 8 has sufficient strength and thickness. Accordingly, when the surface treatment layer 8 is prepared by spraying a coating, the solid content of the sprayed coating is not less than 5 g / m2.

[0103] Optionally, when the PVC mesh layer has a rodent repellent, after extensive experimental verification, the surface treatment layer 8 is a polyvinylidene fluoride layer or a polymethyl methacrylate layer with a thickness of not less than 5 g / m2. The surface treatment layer 8 will not affect the transmission of the rodent repellent's odor to the surface of the composite film. When mice and other animals approach the composite film, they will be irritated by the rodent repellent and will not bite the composite film. At the same time, the odor of the rodent repellent can be prevented from being transmitted to the operator within a safe distance, causing the operator to have a pungent nose, tears in the eyes, and other discomfort symptoms. In one example, a polyvinylidene fluoride layer or a polymethyl methacrylate layer can be mounted on the surface of the bottom PVC adhesive layer 7 (the bottom PVC adhesive layer 7 is away from the surface of the top PVC adhesive layer 5), and then sent to an oven for drying at a drying temperature of 145 to 160°C and a drying time of 30 to 60 seconds. After cooling, the polyvinylidene fluoride layer or the polymethyl methacrylate layer forms the surface treatment layer 8.

[0104] In one embodiment of the present invention, a PVC mesh fabric layer can be first prepared, and then a surface treatment layer 8 is formed on the surface of the bottom PVC adhesive layer 7 of the PVC mesh fabric layer to obtain a PVC film material XB. Next, after a glue layer 4 is sequentially formed on the surface of the top PVC adhesive layer 5 of the PVC mesh fabric layer, a metal barrier layer XA is attached, such that the metal foil layer 3 of the metal barrier layer XA is bonded to the PVC film material XB via the glue layer 4. For example, the glue layer 4 can be evenly applied to the surface of the top PVC adhesive layer 5, and then the metal foil layer 3 and the glue layer 4 can be extrusion-bonded.

[0105] In one example, a combination of a wheel mounting and a laminating process is adopted, and the surface PVC adhesive layer 5 is mounted with glue, the amount of glue is controlled at 10 to 30 g / m2, the glue drying temperature is 120 to 160°C, and the temperature and speed are set according to the glue drying status; the metal barrier layer is sent to a laminating vat and is pressed and bonded with the surface PVC adhesive layer 5 through the glue layer 4, the vat temperature is 80 to 120°C, and the time is 20 to 40 seconds. After the metal foil layer 3 (for example, an aluminum foil layer) and the surface PVC adhesive layer 5 are laminated, they are cooled, bridged, and solidified.

[0106] The present invention also provides a method for preparing a composite membrane material. The composite membrane material of some embodiments of the present invention can be prepared by using the method. The method for preparing the composite membrane material includes:

[0107] Step S110, preparing a metal barrier layer;

[0108] Step S130, preparing a PVC film material;

[0109] Step S150 , laminating the metal barrier layer to the surface of the PVC film.

[0110] In this way, the obtained composite film material includes the metal barrier layer and the PVC film material stacked in sequence.

[0111] In one embodiment of the present invention, the preparing of the metal barrier layer (step S110) includes: laminating a PET layer on the surface of the metal foil layer; and laminating a PE layer on the surface of the PET layer to obtain the metal barrier layer.

[0112] In this way, the prepared metal barrier layer includes a metal foil layer, a PET layer and a PE layer stacked in sequence.

[0113] In one embodiment of the present invention, the preparation of the PVC membrane material (step S130) includes: preparing a PVC mesh cloth layer, the PVC mesh cloth layer including a stacked surface PVC adhesive layer, a polyester fiber mesh cloth and a bottom PVC adhesive layer; applying polyvinylidene fluoride or polymethyl methacrylate to the bottom PVC adhesive layer of the PVC mesh cloth membrane material, and drying at 145 to 160°C for 30 to 60 seconds to obtain a surface treatment layer formed on the surface of the bottom PVC adhesive layer.

[0114] In this way, the prepared PVC membrane material includes a surface PVC adhesive layer, a polyester fiber mesh, a bottom PVC adhesive layer and a surface treatment layer which are stacked in sequence.

[0115] In one embodiment of the present invention, laminating the metal barrier layer to the surface of the PVC film (step S150) includes: applying a glue layer on the surface of the PVC adhesive layer; and extruding and laminating the metal foil layer and the glue layer.

[0116] In this way, the prepared composite film material includes a metal barrier layer, a glue layer and a PVC film material stacked in sequence; the metal foil layer of the metal barrier layer is bonded to the surface PVC glue layer of the PVC film material through the glue layer.

[0117] Through a large number of experiments, it has been verified that the thickness of the composite membrane material is between 0.60mm and 1.2mm, and its strength, barrier effect, rodent-proof effect, adhesion effect and other properties are very good, and the cost is low. It is used in granaries, which reduces the construction cost of granaries, increases the speed of construction, and can be used for 20 years without damage.

[0118] As follows, taking the metal foil layer 3 as an aluminum foil layer, the rodent repellent as capsaicin, and the glue as a mixture of high molecular weight polyester resin and ethyl acetate as an example, the rodent repellent effect, skin effect, barrier effect, adhesion effect and other properties of the composite film material according to the embodiment of the present invention were tested.

[0119] The composite membrane used in this test includes a surface treatment layer, a bottom PVC adhesive layer, a polyester fiber mesh, a top PVC adhesive layer, a glue layer, a metal foil layer, a PET layer, and a PE layer, stacked in this order. The surface treatment layer is a polyvinylidene fluoride layer with a thickness of 5 g / m2. The thicknesses of the bottom and top PVC adhesive layers are 300 and 400 microns, respectively. The weight content of the components other than the rodent repellent is as follows: 80 parts polyvinyl chloride, 15 parts blending resin, 65 parts diisononyl phthalate, 2.5 parts heat stabilizer, 1 part soybean oil, 6 parts antimony oxide, 20 parts calcium carbonate, 10 parts aluminum hydroxide, 2 parts mildew inhibitor, 0.8 parts UV absorber, and 0.4 parts antioxidant. Both the bottom and top PVC adhesive layers contain capsaicin, a rodent repellent; unless otherwise stated, the capsaicin content is 2% by weight. The thickness of the aluminum foil layer is 10 microns, the thickness of the PET layer is 10 microns, the thickness of the PE layer is 80 microns, and the thickness of the glue layer is 5 microns.

[0120] Experiment 1: Rat bite test

[0121] Five experimental mice were first fed with mouse feed for three months, then starved for two days (only water was provided), and then the five experimental mice were placed in five mouse cages and only water was provided for three days. The five mouse cages had been previously placed with composite membranes of 10cm*10cm. Capsaicin was not added to one of the composite membranes; the mass content of capsaicin in the PVC adhesive layer material in the PVC mesh layer of the other four composite membranes was 1%, 1.5%, 3%, and 5%, respectively. Among them, the four composite membranes containing capsaicin are all composite membranes according to the embodiments of the present invention. The only difference between the composite membrane not containing capsaicin and the other composite membranes is that there is no capsaicin in the PVC mesh layer. The tracking was continued for three days, and the bite damage of each composite membrane was recorded. The results are shown in Table 1:

[0122] Table 1

[0123]

[0124] According to Table 1 above, it can be seen that when the capsaicin content added to the PVC mesh layer exceeds 1%, mice will not gnaw on the composite membrane materials containing capsaicin even when they are extremely hungry. These composite membrane materials containing capsaicin are basically not damaged; even if there is damage, it is only local and minor superficial damage, which does not destroy the integrity of the composite membrane materials.

[0125] Test 2: Skin test

[0126] Ten volunteers were selected to touch the composite film material without a surface treatment layer with their hands. The volunteers said that their hands had a pungent chili smell, their eyes would tear, and other discomfort symptoms.

[0127] Ten volunteers touched the composite film material with a surface treatment layer with their hands and reported whether they had any discomfort, especially whether there was a chili smell. After a month of continuous testing, all volunteers said they had no discomfort.

[0128] This indicates that the composite film material according to the embodiment of the present invention can effectively prevent direct exposure of the rodent repellent by adding a surface treatment layer, thereby avoiding harm to workers and contamination of stored goods.

[0129] Test 3: Barrier test

[0130] The air barrier and moisture-proofing effects of various composite films were tested. Each composite film material is a composite film material provided by an embodiment of the present invention, differing only in the thickness of the metal foil layer. Testing was conducted according to the national standards GB / T 1038-2000 (oxygen permeability) and GB / T 1037-1988 (water vapor permeability). Extensive test results indicate that when the aluminum foil layer is at least 10 microns thick, the composite film material of the present invention achieves an air barrier effect exceeding 99%.

[0131] Test 4: Adhesion effect test

[0132] Use a blade to cut a "cross" shaped edge on the surface of the metal barrier layer of the present invention, such as Figure 6 As shown, at least 10 groups were placed with intervals of approximately 3 mm. Cut only the metal barrier layer down to the glue layer, leaving the PVC mesh layer intact. Then, fold the film back and forth continuously along a 90° angle in the shape of a cross. Folding the film over 200 times without losing the metal barrier layer indicates good adhesion. Ten composite films (all according to embodiments of the present invention) were selected as samples and tested according to the above procedure, demonstrating good adhesion.

[0133] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the appended claims.

Claims

1. A composite film material for warehouse, characterized in that: It includes a metal barrier layer and a PVC film material stacked in sequence, wherein the PVC film material is prepared using a polyester fiber mesh as a base material; The metal barrier layer includes a metal foil layer, and the metal foil layer is bonded to the PVC film material; the thickness of the metal foil layer is not less than 10 microns; The metal barrier layer further comprises a PET layer and a PE layer sequentially stacked on a side of the metal foil layer away from the PVC film material; The PVC film material includes a PVC mesh layer and a surface treatment layer located on a side of the PVC mesh layer away from the metal barrier layer; The PVC mesh cloth layer comprises a top PVC adhesive layer, a polyester fiber mesh cloth and a bottom PVC adhesive layer which are stacked; The surface PVC adhesive layer and the bottom PVC adhesive layer contain rodent repellent.

2. The composite film material for warehouse according to claim 1, characterized in that: The metal foil layer is an aluminum foil layer, a copper foil layer, an iron foil layer or a tin foil layer.

3. The composite film material for warehouse according to claim 1, characterized in that: The metal foil layer and the PVC film material are bonded together by a glue layer; the glue of the glue layer is a mixed glue of polyester resin and ethyl acetate, and the thickness of the glue layer is 5 to 10 microns.

4. The composite film material for warehouse according to claim 1, characterized in that: The thickness of the PE layer is 80 to 100 microns, and the thickness of the PET layer is 10 to 20 microns.

5. The composite film material for warehouse according to claim 1, characterized in that: The material of the surface treatment layer includes polyvinylidene fluoride or polymethyl methacrylate.

6. The composite film material for warehouse use according to claim 1, characterized in that: The thickness of the surface treatment layer is not less than 5 g / m2.

7. The composite film material for warehouse according to claim 1, characterized in that: In the surface PVC adhesive layer and the bottom PVC adhesive layer, the mass content of the rodent repellent is between 0.5% and 5.0%.

8. A method for preparing a composite film material for warehouse use according to any one of claims 1 to 7, characterized in that: include: preparing a metal barrier layer; Preparation of PVC membrane materials; The metal barrier layer is attached to the surface of the PVC film.

9. The preparation method according to claim 8, characterized in that The preparation of the metal barrier layer comprises: Laminating a PET layer on the surface of the metal foil layer; The PE layer is laminated on the surface of the PET layer to obtain the metal barrier layer.

10. The preparation method according to claim 9, characterized in that The preparation of the PVC film material comprises: Prepare a PVC mesh layer, wherein the PVC mesh layer comprises a top PVC adhesive layer, a polyester fiber mesh, and a bottom PVC adhesive layer stacked in layers; Prepare the surface treatment layer by applying polyvinylidene fluoride or polymethyl methacrylate on the bottom PVC adhesive layer and drying it at 145-160° C. for 30-60 seconds to obtain the surface treatment layer formed on the surface of the bottom PVC adhesive layer.

11. The preparation method according to claim 10, characterized in that: Laminating the metal barrier layer to the surface of the PVC film material includes: Applying a layer of glue on the surface of the PVC adhesive layer; The metal foil layer and the glue layer are extruded and laminated.

12. A warehouse, characterized in that: The warehouse comprises the composite membrane material according to any one of claims 1 to 7.

13. The warehouse according to claim 12, characterized in that The warehouse is a granary or a fresh-keeping warehouse.

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