Novel environment-friendly plastic bag and preparation method thereof

Abstract

According to the novel environment-friendly plastic bag and the preparation method thereof, the wear resistance is remarkably improved by inlaying magnetic wear-resistant particles on the surface of the novel environment-friendly plastic bag, and the first wear-resistant layer and the second wear-resistant layer are formed by weaving ultra-high molecular weight polyethylene fibers, so that high strength and wear resistance of the plastic bag are ensured; the adsorption layer is formed by blending and weaving activated carbon fibers, polyester fibers and silica gel fibers; the waterproof layer is made of a polyurethane film or a polytetrafluoroethylene film, excellent waterproof and breathable performance is provided, the functions of pattern printing and color change in water feedback are achieved through functional treatment of magnetic wear-resistant particles, the functional magnetic wear-resistant particles are embedded into the wear-resistant layer through a magnetic field subsequently, the wear resistance and the waterproof performance of the plastic bag are improved, and the service life of the plastic bag is prolonged. The plastic bag is endowed with lasting pattern printing effect and water seepage detection capability, so that the practicability and safety of the plastic bag in an actual application scene are remarkably improved, the service life of the plastic bag is effectively prolonged, and the user experience is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of environmentally friendly plastic bags, and more specifically, to a novel environmentally friendly plastic bag and a preparation method thereof. Background Art

[0002] The plastic industry has developed rapidly, and the use of a large number of plastic products, especially plastic bag products, has brought great convenience to human life. Plastic bags are widely used because of their low price, light weight, large capacity and easy storage. However, the existing plastic bags will remain in the environment for a long time after being discarded after use, resulting in a large amount of plastic bag waste accumulating in the environment, causing serious harm to the environment. Therefore, a new type of environmentally friendly plastic bag is needed to reduce the harm caused by plastic waste.

[0003] Existing environmentally friendly plastic bags have significant deficiencies in many aspects. First, conventional wear-resistant materials are prone to wear and tear after long-term use, affecting their service life and reliability. Second, although existing plastic bags have basic waterproof properties, it is difficult to timely monitor and feedback the water seepage caused by wear of plastic bags, making it impossible for users to take maintenance measures in time. In addition, in outdoor activities, in order to solve the above problems, it is urgently necessary to develop a new multifunctional plastic bag that integrates wear resistance, waterproofness, pattern printing and feedback functions to improve its performance and user experience in various application scenarios.

[0004] Therefore, in view of the above technical problems, it is necessary to provide a new type of environmentally friendly plastic bag and a preparation method thereof. Summary of the invention

[0005] The object of the present invention is to provide a novel environmentally friendly plastic bag and a preparation method thereof to solve the above-mentioned problems.

[0006] In order to achieve the above purpose, the technical solution provided by an embodiment of the present invention is as follows: A new type of environmentally friendly plastic bag comprises a first wear-resistant layer, an adsorption layer, a waterproof layer and a second wear-resistant layer which are arranged in sequence from outside to inside, wherein: The first wear-resistant layer and the second wear-resistant layer are both embedded with magnetic wear-resistant particles on their outer surfaces.

[0007] As a further improvement of the present invention, the first wear-resistant layer and the second wear-resistant layer are both formed by blending and weaving high-strength fiber materials; the high-strength fiber material is ultra-high molecular weight polyethylene fiber.

[0008] As a further improvement of the present invention, the adsorption layer is formed by blending and weaving the following materials: activated carbon fiber accounts for 55%, polyester fiber accounts for 25%, and silica gel fiber accounts for 20%.

[0009] As a further improvement of the present invention, the waterproof layer is made of a breathable and waterproof film, the film material is any one of a polyurethane film and a polytetrafluoroethylene film, and the material of the magnetic wear-resistant particles is any one of alumina, zirconium oxide and silicon carbide.

[0010] A method for preparing a novel environmentally friendly plastic bag comprises the following steps: S1: Ultra-high molecular weight polyethylene fibers are blended and woven into a first wear-resistant layer and a second wear-resistant layer of a mesh structure; S2: Mixing activated carbon fiber, polyester fiber and silica gel fiber in weight percentages of 55%, 25% and 20%, respectively, and weaving the mixed material into a plastic bag through a blending process to obtain an adsorption layer; S3: cutting any one of the polyurethane film and the polytetrafluoroethylene film into a desired size to obtain a waterproof layer; S4: stacking the first wear-resistant layer, the adsorption layer, the waterproof layer and the second wear-resistant layer in sequence from outside to inside, and firmly combining the layers of plastic bags using a hot pressing process or an adhesive to form an integral plastic bag; S5: selecting any one of aluminum oxide, zirconium oxide and silicon carbide, and coating the outer surface of the selected one with a magnetic material to form magnetic wear-resistant particles; S6: dividing the magnetic wear-resistant particles into two parts, and performing functional treatment on each part, so that one part of the magnetic wear-resistant particles has a pattern printing function, and the other part of the magnetic wear-resistant particles has a feedback function; S7: embedding pattern-printed functionalized magnetic wear-resistant particles into the first wear-resistant layer, and embedding feedback-functionalized magnetic wear-resistant particles into the second wear-resistant layer.

[0011] As a further improvement of the present invention, the specific operation steps of functionalizing a portion of the magnetic wear-resistant particles in step S6 to obtain magnetic wear-resistant particles with pattern printing function include: S61: Selecting the prepared magnetic particle material mixture to ensure high hardness and wear resistance; S62: washing and drying the magnetic particles to remove surface impurities and ensure the purity and effect of subsequent chemical treatment; S63: Silane coupling press-blown film treatment of the magnetic particle surface to increase its chemical activity and provide anchoring points for further functional modification; S64: soaking the activated magnetic particles in a granulation solution containing environmentally friendly and harmless to human body, and granulating the particles into natural extracts; S65: The granulation is firmly bonded to the surface of the magnetic particles by physical adsorption, giving the particles a pattern printing function; S66: Post-processing the magnetic particles after pattern printing functionalization, including washing and drying again to remove unreacted chemicals and stabilize the particle surface.

[0012] As a further improvement of the present invention, the natural extract in step S64 is any one of citronella oil and eucalyptus oil.

[0013] As a further improvement of the present invention, the specific operation steps of functionalizing another part of the magnetic wear-resistant particles in step S6 to obtain the magnetic wear-resistant particles with feedback function include: S611: Selecting the prepared magnetic particle material mixture to ensure high hardness and wear resistance; S612: washing and drying the magnetic particles to remove surface impurities and ensure the purity and effect of subsequent chemical treatment; S613: Silane coupling press-blown film treatment of the magnetic particle surface to increase its chemical activity and provide anchor points for further functional modification; S614: selecting a functional dye that changes color when exposed to water and dissolving it in an ethanol solution, and immersing the activated magnetic wear-resistant particles in the solution containing the dye that changes color when exposed to water, so that the dye is firmly bound to the surface of the magnetic wear-resistant particles by physical adsorption; S615: Post-processing the functionalized magnetic wear-resistant particles, including washing and drying again, to remove unreacted dyes and solvents and ensure the stability and uniformity of the dyes on the particle surface.

[0014] As a further improvement of the present invention, the functionalized dye in step S614 is any one of a chemically synthesized water-sensitive dye and a natural color-changing material.

[0015] As a further improvement of the present invention, the specific operation steps of embedding the pattern-printed functionalized magnetic wear-resistant particles into the first wear-resistant layer and embedding the feedback-functionalized magnetic wear-resistant particles into the second wear-resistant layer in step S7 include: S71: placing the wear-resistant layer on a specific magnetic field device, the magnetic field strength and direction of which are optimized to attract the functionalized magnetic wear-resistant particles; S72: evenly spreading the functionalized magnetic wear-resistant particles on the wear-resistant layer; S73: Under the action of the magnetic field, the vibration platform is started to slightly vibrate the wear-resistant layer, so that the magnetic wear-resistant particles after functional treatment can be better embedded in the mesh. The vibration helps the particles find the best position under the action of the magnetic force and embed firmly; S74: Select a breathable adhesive such as any one of breathable polyurethane adhesive and silicone, and evenly apply the adhesive on the surface of the mesh structure of the wear-resistant layer to ensure that the adhesive forms a uniform coverage between the meshes without clogging the meshes.

[0016] Compared with the prior art, the advantages of the present invention are: In view of the shortcomings of existing environmentally friendly plastic bags, this scheme proposes a new type of environmentally friendly plastic bag and its preparation method. The plastic bag significantly improves the wear resistance by embedding magnetic wear-resistant particles on its surface. The first and second wear-resistant layers are woven with ultra-high molecular weight polyethylene fibers to ensure that the plastic bag has high strength and wear resistance. The adsorption layer is woven by blending activated carbon fiber, polyester fiber and silica gel fiber, which can effectively adsorb and continuously release granulation. The waterproof layer adopts polyurethane film or polytetrafluoroethylene film to provide excellent waterproof and breathable properties. Through the functional treatment of magnetic wear-resistant particles, pattern printing and water-changing color feedback functions are realized, including sequentially preparing each layer of plastic bag and combining them into a whole, using a magnetic field to embed the functionalized magnetic wear-resistant particles into the wear-resistant layer to ensure their firm adhesion, which not only improves the wear resistance and waterproofness of the plastic bag, but also gives it a lasting pattern printing effect and water seepage detection capability, significantly improving the practicality and safety of plastic bags in outdoor equipment, sportswear, industrial protective clothing and other application scenarios, effectively extending the service life of plastic bags and improving user experience. A magnetic particle material mixture is used, and then coupling pressing and blowing are carried out. The dye concentration is made to be 3% through silane coupling pressing and blowing, and the soaking time is 1.5 hours. The drying temperature is controlled at 35°C, and the magnetic wear-resistant particles that have been feedback functionalized are embedded in a plastic bag. The color change time of the plastic bag is tested in a simulated water seepage environment. Through the above steps and structure, the wear-resistant and insect repellent effects can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the steps of a method for preparing a novel environmentally friendly plastic bag of the present invention; Figure 2 This is a schematic diagram of comparative experimental data of Example 1 and Example 3 of the present invention; Figure 3 This is a schematic diagram of comparative experimental data of Example 2 and Example 3 of the present invention; Figure 4 This is a schematic diagram of control experimental data of Example 3 of the present invention; Figure 5 This is a schematic diagram of the three-dimensional structure of the environmentally friendly plastic bag of the present invention; Figure 6 It is a schematic diagram of the first wear-resistant layer of the present invention. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention. Example

[0019] See also Figure 1 , a new type of environmentally friendly plastic bag, comprising a first wear-resistant layer, an adsorption layer, a waterproof layer and a second wear-resistant layer arranged in sequence from the outside to the inside, wherein: The first wear-resistant layer and the second wear-resistant layer are both embedded with magnetic wear-resistant particles on their outer surfaces.

[0020] The first wear-resistant layer and the second wear-resistant layer are both woven from high-strength fiber materials, which enable the functionalized magnetic wear-resistant particles to be better embedded in the mesh; the high-strength fiber material is ultra-high molecular weight polyethylene fiber.

[0021] The adsorption layer, which enables the functionalized magnetic wear-resistant particles to be better embedded in the mesh, is woven from a blend of the following materials: 55% activated carbon fiber, 25% polyester fiber, and 20% silica fiber.

[0022] The waterproof layer that allows the functionalized magnetic wear-resistant particles to be better embedded in the mesh is made of a breathable and waterproof film, the film material is any one of a polyurethane film and a polytetrafluoroethylene film, and the material of the magnetic wear-resistant particles is any one of alumina, zirconium oxide and silicon carbide.

[0023] A method for preparing a novel environmentally friendly plastic bag comprises the following steps: S1: Ultra-high molecular weight polyethylene fibers are blended and woven into a first wear-resistant layer and a second wear-resistant layer of a mesh structure; S2: Mixing activated carbon fiber, polyester fiber and silica gel fiber in weight percentages of 55%, 25% and 20%, respectively, and weaving the mixed material into a plastic bag through a blending process to obtain an adsorption layer; S3: cutting any one of the polyurethane film and the polytetrafluoroethylene film into a desired size to obtain a waterproof layer; S4: stacking the first wear-resistant layer, the adsorption layer, the waterproof layer and the second wear-resistant layer in sequence from outside to inside, and firmly combining the layers of plastic bags using a hot pressing process or an adhesive to form an integral plastic bag; S5: selecting any one of aluminum oxide, zirconium oxide and silicon carbide, and coating the outer surface of the selected one with a magnetic material to form magnetic wear-resistant particles; S6: dividing the magnetic wear-resistant particles into two parts, and performing functional treatment on each part, so that one part of the magnetic wear-resistant particles has a pattern printing function, and the other part of the magnetic wear-resistant particles has a feedback function; S7: embedding pattern-printed functionalized magnetic wear-resistant particles into the first wear-resistant layer, and embedding feedback-functionalized magnetic wear-resistant particles into the second wear-resistant layer.

[0024] Among them, in view of the shortcomings of existing environmentally friendly plastic bags, a new type of environmentally friendly plastic bag and a preparation method thereof are proposed. The plastic bag significantly improves the wear resistance by embedding magnetic wear-resistant particles on its surface, and uses ultra-high molecular weight polyethylene fibers to weave the first and second wear-resistant layers to ensure that the plastic bag has high strength and wear resistance; the adsorption layer is woven from a blend of activated carbon fibers, polyester fibers and silica gel fibers, which can effectively adsorb and continuously release granulation; the waterproof layer uses a polyurethane film or a polytetrafluoroethylene film to provide excellent waterproof and breathable properties, and through the functionalization of the magnetic wear-resistant particles, pattern printing and water-changing color feedback functions are realized, including preparing each layer of plastic bags in turn and combining them into a whole, and using a magnetic field to embed the functionalized magnetic wear-resistant particles into the wear-resistant layer to ensure their firm adhesion, which not only improves the wear resistance and waterproofness of the plastic bag, but also gives it a lasting pattern printing effect and water seepage detection capability, significantly improving the practicality and safety of plastic bags in outdoor equipment, sportswear, industrial protective clothing and other application scenarios, effectively extending the service life of the plastic bag and improving the user experience.

[0025] The specific operation steps of performing functional treatment on a part of the magnetic wear-resistant particles to obtain the magnetic wear-resistant particles with pattern printing function in step S6 so that the functionalized magnetic wear-resistant particles can be better embedded in the mesh include: S61: Selecting the prepared magnetic particle material mixture to ensure high hardness and wear resistance; S62: washing and drying the magnetic particles to remove surface impurities and ensure the purity and effect of subsequent chemical treatment; S63: Silane coupling press-blown film treatment of the magnetic particle surface to increase its chemical activity and provide anchoring points for further functional modification; S64: soaking the activated magnetic particles in a granulation solution containing environmentally friendly and harmless to human body, and granulating the particles into natural extracts; S65: The granulation is firmly bonded to the surface of the magnetic particles by physical adsorption, giving the particles a pattern printing function; S66: Post-processing the magnetic particles after pattern printing functionalization, including washing and drying again to remove unreacted chemicals and stabilize the particle surface.

[0026] The functionalized magnetic wear-resistant particles can be better embedded in the mesh. The natural extract in step S64 is any one of citronella oil and eucalyptus oil.

[0027] Among them, the prepared magnetic particle material mixture is first selected to ensure that it has high hardness and wear resistance, such as aluminum oxide, zirconium oxide or silicon carbide. The above-mentioned particle materials need to have excellent physical properties to ensure that they are not easily worn and broken during use.

[0028] The selected magnetic particle material mixture is cleaned, and the dust, oil and other impurities on the particle surface are removed with pure water or appropriate cleaning solvent. After cleaning, the particles are dried by natural air drying or low-temperature drying in an oven to ensure that there is no residual moisture and impurities on the particle surface to ensure the purity and effect of subsequent chemical treatment.

[0029] The surface of the dried magnetic particles is treated with silane coupling blown film. Silane coupling blown film can form an active coating on the surface of the particles through chemical reaction, thereby increasing the chemical activity of the particle surface and providing an anchor point for subsequent functional modification. This step can be carried out at room temperature and ensure that the coupling blown film evenly covers the particle surface.

[0030] The surface activated magnetic particles are immersed in a granulation solution containing an environmentally friendly and harmless granulation solution. The granulation solution is selected from natural extracts, such as lemon eucalyptus extract, citronella oil or other certified natural granulations. The above granulation solution is not only environmentally friendly, but also harmless to the human body and is suitable for application in textiles.

[0031] During the soaking process, the granulation is firmly bound to the surface of the magnetic particles by physical adsorption. The granulation molecules are attached to the surface of the particles through physical effects such as van der Waals forces or hydrogen bonds to form a stable pattern printing coating. The soaking time and pattern printing need to be determined according to specific experiments to ensure the best adsorption effect.

[0032] Subsequently, the adsorbed and granulated magnetic wear-resistant particles are post-processed, the particles are taken out from the granulation solution, and are washed again to remove the unreacted granulation residues on the surface, and then the particles are dried to ensure the stability and uniformity of the particle surface coating. Drying can be done by natural air drying or in a low-temperature oven to avoid high temperature damage to the granulation.

[0033] Through the above steps, the magnetic wear-resistant particles will have the function of pattern printing. After being embedded in the first wear-resistant layer of the environmentally friendly plastic bag, these functionalized magnetic particles will give the plastic bag a lasting pattern printing effect while maintaining the wear-resistant properties of the particles themselves.

[0034] Specifically, the first wear-resistant layer, that is, the plastic bag layer with pattern printing function, will be designed as the outer end of the tent. Or it can also be applied to protective clothing and workwear, mountaineering clothing and camping clothing, etc. This layer can not only resist the wear and damage of the external environment, but also effectively repel mosquitoes and other possible pests, providing a safer and more comfortable outdoor environment. Due to the functional treatment of magnetic particles, the outer layer of the plastic bag can release specific chemicals to repel mosquitoes. Even in outdoor environments, the pattern printing effect can maintain long-term continuity without frequent replacement or additional treatment.

[0035] The embedded magnetic particles have excellent wear resistance and can protect the tent plastic bags from wear and tear in harsh outdoor conditions, extending the service life of the plastic bags. During outdoor camping and mountaineering activities, the pattern printing function on the outer layer of the plastic bags can effectively prevent mosquito bites and reduce the troubles caused by pests.

[0036] When the pattern printing efficiency of the functionalized magnetic wear-resistant particles is reduced, the plastic bags can be sprayed and granulated manually, and the sprayed granules are continuously released through the adsorption layer to achieve the pattern printing effect.

[0037] The specific operation steps of performing functional treatment on another part of the magnetic wear-resistant particles to obtain the magnetic wear-resistant particles with feedback function in step S6 so that the magnetic wear-resistant particles after functional treatment can be better embedded in the mesh include: S611: Selecting the prepared magnetic particle material mixture to ensure high hardness and wear resistance; S612: washing and drying the magnetic particles to remove surface impurities and ensure the purity and effect of subsequent chemical treatment; S613: Silane coupling press-blown film treatment of the magnetic particle surface to increase its chemical activity and provide anchor points for further functional modification; S614: selecting a functional dye that changes color when exposed to water and dissolving it in an ethanol solution, and immersing the activated magnetic wear-resistant particles in the solution containing the dye that changes color when exposed to water, so that the dye is firmly bound to the surface of the magnetic wear-resistant particles by physical adsorption; S615: Post-processing the functionalized magnetic wear-resistant particles, including washing and drying again, to remove unreacted dyes and solvents and ensure the stability and uniformity of the dyes on the particle surface.

[0038] The functionalized magnetic wear-resistant particles can be better embedded in the mesh. In step S614, the functionalized dye is any one of a chemically synthesized water-sensitive dye and a natural color-changing material.

[0039] Among them, first of all, the prepared magnetic particle material mixture is selected to have excellent physical properties to ensure that it is not easy to wear and break during use. The selected magnetic particle material mixture is cleaned, and pure water or an appropriate cleaning solvent is used to remove dust, oil and other impurities on the surface of the particles. After cleaning, the particles are dried by natural air drying or low-temperature drying in an oven to ensure that there is no residual moisture and impurities on the surface of the particles to ensure the purity and effect of subsequent chemical treatment.

[0040] The surface of the dried magnetic particles is treated with silane coupling blown film. Silane coupling blown film can form an active coating on the surface of the particles through chemical reaction, thereby increasing the chemical activity of the particle surface, providing an anchor point for subsequent functional modification, and ensuring that the coupling blown film evenly covers the particle surface.

[0041] A functional dye that changes color when exposed to water is selected and dissolved in an ethanol solution. The magnetic wear-resistant particles that have undergone surface activation treatment are then immersed in the ethanol solution containing the hydrochromic dye. During the immersion process, the dye is firmly bound to the surface of the magnetic wear-resistant particles by physical adsorption. The immersion time and dye concentration need to be determined based on specific experiments to ensure the best adsorption effect.

[0042] The magnetic wear-resistant particles that have adsorbed the dye are then post-processed. First, the particles are taken out of the dye solution and washed again to remove unreacted dye and solvent residues on the surface. Then, the particles are dried to ensure the stability and uniformity of the dye on the particle surface. Drying can be done by natural air drying or in a low-temperature oven to avoid high temperature damage to the dye.

[0043] Through the above steps, the magnetic wear-resistant particles will have the feedback function of changing color when exposed to water. After the functionalized magnetic particles are embedded in the second wear-resistant layer of the environmentally friendly plastic bag, they will give the plastic bag a feedback effect of changing color when exposed to water while maintaining the wear-resistant properties of the particles themselves.

[0044] Specifically, the second wear-resistant layer, that is, the plastic bag layer with water-changing color feedback function, will be designed as the inner end of the tent, or can also be applied to camping sleeping bags and mats, roof tents and life jackets and life rafts, as well as greenhouses and sheds. This layer can not only resist the wear and damage of the internal environment, but also effectively monitor whether there is leakage or moisture inside the tent. Due to the functionalization of magnetic particles, the inner layer of the plastic bag will undergo obvious color changes when it comes into contact with water, providing instant visual feedback, reminding users to take timely measures for maintenance and repairs. Even in harsh outdoor environments, this feedback function can maintain long-term effectiveness without frequent replacement or additional treatment.

[0045] The specific operation steps of embedding the pattern-printed functionalized magnetic wear-resistant particles into the first wear-resistant layer and embedding the feedback-functionalized magnetic wear-resistant particles into the second wear-resistant layer in step S7 so that the functionalized magnetic wear-resistant particles can be better embedded into the mesh include: S71: placing the wear-resistant layer on a specific magnetic field device, the magnetic field strength and direction of which are optimized to attract the functionalized magnetic wear-resistant particles; S72: evenly spreading the functionalized magnetic wear-resistant particles on the wear-resistant layer; S73: Under the action of the magnetic field, the vibration platform is started to slightly vibrate the wear-resistant layer, so that the magnetic wear-resistant particles after functional treatment can be better embedded in the mesh. The vibration helps the particles find the best position under the action of the magnetic force and embed firmly; S74: Select a breathable adhesive such as any one of breathable polyurethane adhesive and silicone, and evenly apply the adhesive on the surface of the mesh structure of the wear-resistant layer to ensure that the adhesive forms a uniform coverage between the meshes without clogging the meshes.

[0046] Among them, the first or second wear-resistant layer is placed on a specific magnetic field device, which is composed of a coil and a soft magnetic material core. The strength and direction of the magnetic field are controlled by electric current. The strength and direction of the magnetic field can be precisely controlled to adapt to magnetic particles of different types and sizes. The magnetic field strength and direction of the device are optimized and specifically used to attract functionalized magnetic wear-resistant particles to ensure that the particles can be accurately adsorbed into the mesh of the wear-resistant layer.

[0047] The functionalized magnetic wear-resistant particles (pattern-printed functionalized particles are used for the first wear-resistant layer, and feedback functionalized particles are used for the second wear-resistant layer) are evenly spread on the surface of the wear-resistant layer to ensure that the particles are evenly distributed over the entire wear-resistant layer to achieve the best functional effect.

[0048] Under the action of the magnetic field, the vibration platform is started to make the wear-resistant layer vibrate slightly. The vibration helps the magnetic wear-resistant particles to better embed into the mesh of the wear-resistant layer under the action of magnetic force and find the best position, which can ensure that the particles are firmly embedded in the mesh and improve its stability and durability.

[0049] Select a breathable adhesive, such as breathable polyurethane glue or silicone. The above adhesive can not only firmly bond the magnetic particles and fiber materials, but also maintain the air permeability and comfort of the plastic bag. Evenly apply the selected adhesive on the mesh structure surface of the wear-resistant layer to ensure that the adhesive forms a uniform coverage between the meshes but does not block the meshes to maintain the air permeability of the plastic bag. After such treatment, the functionalized magnetic wear-resistant particles will be firmly fixed in the wear-resistant layer.

[0050] Through the above operation steps, the pattern printing functionalized and feedback functionalized magnetic wear-resistant particles will be embedded in the first and second wear-resistant layers respectively, ensuring that the plastic bag has wear resistance while also realizing the multiple functions of pattern printing and feedback. At the same time, one side can be selected for preparation and application according to actual conditions.

[0051] For the application of functionalized magnetic wear-resistant particles in environmentally friendly plastic bags, the magnetic wear-resistant particles use alumina as the base material and are granulated into citronella oil. The specific operation steps are as follows: Magnetic particle material mixture: alumina; Granulation: Citronella oil; Coupling extrusion blown film: silane coupling extrusion blown film; Pattern printing: 5%; Soaking time: 2 hours; Drying temperature: 40°C; After the magnetic wear-resistant particles with pattern printing functionalization were embedded in plastic bags, the number of mosquito bites was tested in a simulated outdoor environment. The results are as follows: Untreated plastic bags: mosquito bites 60 times / hour; Pattern-printed functional plastic bags: The number of mosquito bites is 10 times / hour. Example

[0052] In this embodiment, the magnetic wear-resistant particles use silicon carbide as the substrate, and the feedback dye is a water-sensitive dye. The specific operation steps are as follows: Magnetic particle material mixture: silicon carbide; Feedback dye: water sensitive dye; Coupling extrusion blown film: silane coupling extrusion blown film; Dye concentration: 3%; Soaking time: 1.5 hours; Drying temperature: 35°C; Feedback effect test: After the magnetic wear-resistant particles with feedback functionalization were embedded in the plastic bag, the color change time of the plastic bag was tested in a simulated water seepage environment. The results are as follows: Untreated plastic bags: color change time is 30 seconds; Feedback functionalized plastic bag: color change time is 5 seconds. Example

[0053] In this embodiment, the magnetic wear-resistant particles use zirconium oxide as the base material, the granulation is eucalyptus oil, and the feedback dye is a natural color-changing material. The specific operation steps are as follows: Magnetic particle material mixture: zirconium oxide; Granulation: eucalyptus oil; Feedback dyes: natural color-changing materials; Coupling extrusion blown film: silane coupling extrusion blown film; Pattern printing: 6%; Dye concentration: 4%; Soaking time: 2 hours; Drying temperature: 40°C; A magnetic particle material mixture is used, and then coupling pressing and blowing are carried out. The dye concentration is made 3% through silane coupling pressing and blowing, and the soaking time is 1.5 hours. The drying temperature is controlled at 35°C, and the magnetic wear-resistant particles that have been feedback functionalized are embedded in the plastic bag. The color change time of the plastic bag is tested in a simulated water seepage environment. Through the above steps and structure, the wear-resistant and insect repellent effects can be achieved.

[0054] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0055] In addition, it should be understood that although the present specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that those skilled in the art can understand.

Claims

1. A new type of environmentally friendly plastic bag, characterized by: It includes a first wear-resistant layer, an adsorption layer, a waterproof layer and a second wear-resistant layer arranged in sequence from the outside to the inside, wherein: The first wear-resistant layer and the second wear-resistant layer are both embedded with magnetic wear-resistant particles on their outer surfaces.

2. A new type of environmentally friendly plastic bag according to claim 1, characterized in that: The first wear-resistant layer and the second wear-resistant layer are both formed by blending and weaving high-strength fiber materials; the high-strength fiber material is ultra-high molecular weight polyethylene fiber.

3. A new type of environmentally friendly plastic bag according to claim 1, characterized in that: The adsorption layer is formed by blending and weaving the following materials: activated carbon fiber accounts for 50%-60%, polyester fiber accounts for 20%-30%, and silica gel fiber accounts for 15%-25%.

4. A new type of environmentally friendly plastic bag according to claim 1, characterized in that: The waterproof layer is made of a breathable and waterproof film, the film material is any one of a polyurethane film and a polytetrafluoroethylene film, and the material of the magnetic wear-resistant particles is any one of aluminum oxide, zirconium oxide and silicon carbide.

5. A method for preparing a new type of environmentally friendly plastic bag, characterized in that: The following steps are involved: S1: Ultra-high molecular weight polyethylene fibers are blended and woven into a first wear-resistant layer and a second wear-resistant layer of a mesh structure; S2: Mixing activated carbon fiber, polyester fiber and silica gel fiber in weight percentages of 50%-60%, 20%-30% and 15%-25%, respectively, and weaving the mixed material into a plastic bag through a blending process to obtain an adsorption layer; S3: cutting any one of the polyurethane film and the polytetrafluoroethylene film into a desired size to obtain a waterproof layer; S4: stacking the first wear-resistant layer, the adsorption layer, the waterproof layer and the second wear-resistant layer in sequence from outside to inside, and firmly combining the layers of plastic bags using a hot pressing process or an adhesive to form an integral plastic bag; S5: selecting any one of aluminum oxide, zirconium oxide and silicon carbide, and coating the outer surface of the selected one with a magnetic material to form magnetic wear-resistant particles; S6: dividing the magnetic wear-resistant particles into two parts, and performing functional treatment on each part, so that one part of the magnetic wear-resistant particles has a pattern printing function, and the other part of the magnetic wear-resistant particles has a feedback function; S7: embedding pattern-printed functionalized magnetic wear-resistant particles into the first wear-resistant layer, and embedding feedback-functionalized magnetic wear-resistant particles into the second wear-resistant layer.

6. The method for preparing a novel environmentally friendly plastic bag according to claim 5, characterized in that: The specific operation steps of functionalizing a portion of the magnetic wear-resistant particles in step S6 to obtain magnetic wear-resistant particles with pattern printing function include: S61: Selecting the prepared magnetic particle material mixture to ensure high hardness and wear resistance; S62: washing and drying the magnetic particles to remove surface impurities and ensure the purity and effect of subsequent chemical treatment; S63: Silane coupling press-blown film treatment of the magnetic particle surface to increase its chemical activity and provide anchoring points for further functional modification; S64: soaking the activated magnetic particles in a granulation solution containing environmentally friendly and harmless to human body, and granulating the particles into natural extracts; S65: The granulation is firmly bonded to the surface of the magnetic particles by physical adsorption, giving the particles a pattern printing function; S66: Post-processing the magnetic particles after pattern printing functionalization, including washing and drying again to remove unreacted chemicals and stabilize the particle surface.

7. The method for preparing a novel environmentally friendly plastic bag according to claim 6, characterized in that: The natural extract in step S64 is any one of citronella oil and eucalyptus oil.

8. The method for preparing a novel environmentally friendly plastic bag according to claim 5, characterized in that: The specific operation steps of performing functional treatment on another part of the magnetic wear-resistant particles in step S6 to obtain the magnetic wear-resistant particles with feedback function include: S611: Selecting the prepared magnetic particle material mixture to ensure high hardness and wear resistance; S612: washing and drying the magnetic particles to remove surface impurities and ensure the purity and effect of subsequent chemical treatment; S613: Silane coupling press-blown film treatment of the magnetic particle surface to increase its chemical activity and provide anchor points for further functional modification; S614: selecting a functional dye that changes color when exposed to water and dissolving it in an ethanol solution, and immersing the activated magnetic wear-resistant particles in the solution containing the dye that changes color when exposed to water, so that the dye is firmly bound to the surface of the magnetic wear-resistant particles by physical adsorption; S615: Post-processing the functionalized magnetic wear-resistant particles, including washing and drying again, to remove unreacted dyes and solvents and ensure the stability and uniformity of the dyes on the particle surface.

9. The method for preparing a novel environmentally friendly plastic bag according to claim 8, characterized in that: The functionalized dye in step S614 is any one of a chemically synthesized water-sensitive dye and a natural color-changing material.

10. The method for preparing a novel environmentally friendly plastic bag according to claim 5, characterized in that: The specific operation steps of embedding the pattern-printed functionalized magnetic wear-resistant particles into the first wear-resistant layer and embedding the feedback-functionalized magnetic wear-resistant particles into the second wear-resistant layer in step S7 include: S71: placing the wear-resistant layer on a specific magnetic field device, the magnetic field strength and direction of which are optimized to attract the functionalized magnetic wear-resistant particles; S72: evenly spreading the functionalized magnetic wear-resistant particles on the wear-resistant layer; S73: Under the action of the magnetic field, the vibration platform is started to slightly vibrate the wear-resistant layer, so that the magnetic wear-resistant particles after functional treatment can be better embedded in the mesh. The vibration helps the particles find the best position under the action of the magnetic force and embed firmly; S74: Select a breathable adhesive such as any one of breathable polyurethane adhesive and silicone, and evenly apply the adhesive on the surface of the mesh structure of the wear-resistant layer to ensure that the adhesive forms a uniform coverage between the meshes without clogging the meshes.

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