Antibacterial mildew-proof sanitary container bag and preparation process thereof

Abstract

The invention discloses an antibacterial and mildew-proof sanitary container bag and a preparation process thereof, and relates to the technical field of container bags, the antibacterial and mildew-proof sanitary container bag comprises a plastic woven cloth layer, a bonding layer and a base layer from outside to inside in sequence; the base layer is composed of a base material and antibacterial and mildew-proof resin particles, and the base material is composed of a bottom layer, a middle layer and a surface layer in sequence; the antibacterial mildew-proof resin particles are positioned on the bottom layer and the middle layer or the middle layer and the surface layer of the base layer; the addition amount of the antibacterial and mildew-proof resin particles in the base layer accounts for 3.0-5.0% of the total addition amount of the base layer in percentage by weight; the water absorption layer is introduced into the antibacterial mildew-proof resin particles, the release speed of silver ions is effectively controlled through the slow release effect of the water absorption silica gel, too fast loss of the silver ions is avoided, slow release of the silver ions is achieved, and therefore the antibacterial time of the container bag is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of container bags, in particular to an antibacterial and mildew-proof sanitary container bag and a preparation process thereof. Background Art

[0002] Container bags, also known as ton bags, container bags, space bags, etc., are a kind of flexible transport packaging container. They are moisture-proof, dust-proof, radiation-resistant, firm and safe, and have sufficient structural strength. Since container bags are easy to load and unload and carry, the loading and unloading efficiency has been significantly improved, and they have developed rapidly in recent years. Container bags are generally made of polyester fibers such as polypropylene and polyethylene. Container bags are a kind of container unit equipment. With a crane, container unit transportation can be realized. It is suitable for transporting bulk powder and granular materials. Container bags are a kind of flexible transport packaging container, which is widely used in the transportation and packaging of powdered, granular and blocky items such as food, grains, medicines, chemicals, and minerals. It is an effective packaging product for transportation and warehousing.

[0003] For example, the Chinese patent with application number CN202110560627.2, an antibacterial and mildew-proof sanitary packaging bag and its preparation process, discloses an antibacterial and mildew-proof sanitary packaging bag and its preparation process, which belongs to the field of packaging bags, and the ink layer printed on the surface of the film body contains an antibacterial agent; the content of the antibacterial agent in the ink layer accounts for 3.0-5.0% of the total weight of the ink layer; the film body contains antibacterial and mildew-proof resin particles. The beneficial effects of this invention are: by mixing three antibacterial and mildew-proof components of silver ion salt, zinc ion salt and copper ion salt, zinc ion salt and copper ion salt are attached to the surface of silver ion salt particles, which can effectively reduce and control the migration and loss rate of silver ion salt, thereby extending the antibacterial and mildew-proof time of the packaging bag.

[0004] Although the above scheme prolongs the antibacterial and mildew-proof time of the packaging bag, the extension time is limited. When in a moist and humid environment, the antibacterial and mildew-proof time of the antibacterial and mildew-proof resin particles will be further shortened, and the antibacterial effect will fail quickly, which cannot meet the needs of long-term transportation and storage. Summary of the invention

[0005] The embodiments of the present application provide an antibacterial and mildew-proof sanitary container bag and a preparation process thereof, thereby solving the problems of limited improvement in the antibacterial and mildew-proof time and rapid antibacterial failure of the container bag in the prior art. By introducing a water-absorbing layer into the antibacterial and mildew-proof resin particles and utilizing the sustained-release effect of the water-absorbing silica gel, the release rate of silver ions is effectively controlled, thereby avoiding excessive loss of silver ions, thereby extending the antibacterial time of the container bag.

[0006] The embodiment of the present application provides an antibacterial and mildew-proof sanitary container bag, which comprises, from the outside to the inside, a plastic woven cloth layer, an adhesive layer, and a base layer;

[0007] The plastic woven fabric layer is prepared from the following components in parts by weight: 100 parts of polypropylene, 20-30 parts of ethylene-propylene random copolymer, 0.7-1.2 parts of maleic anhydride grafted polypropylene, 0.3-0.5 parts of nano silicon dioxide, and 0.1-0.3 parts of a first antioxidant;

[0008] The adhesive layer is prepared from the following components in parts by weight: 100 parts of polyethylene, 35-40 parts of ethylene-methacrylic acid copolymer;

[0009] The base layer is composed of a substrate and antibacterial and anti-mildew resin particles. The substrate is composed of three layers, namely: a bottom layer, a middle layer and a surface layer;

[0010] The surface layer comprises the following components in parts by weight: 100 parts of low-density polyethylene, 10-15 parts of ethylene-vinyl acetate copolymer, 1-3 parts of calcium stearate, and 0.1-0.3 parts of a second antioxidant;

[0011] The middle layer comprises the following components in parts by weight: 100 parts of linear low-density polyethylene, 15-20 parts of high-density polyethylene, 10-15 parts of ethylene-vinyl alcohol copolymer, 0.1-0.3 parts of a second antioxidant, and 0.1-0.3 parts of a lubricant;

[0012] The bottom layer comprises the following components in parts by weight: 100 parts of low-density polyethylene, 50-60 parts of linear low-density polyethylene, and 20-30 parts of metallocene polyethylene;

[0013] The antibacterial and anti-mildew resin particles are located in the bottom layer and the middle layer or the middle layer and the surface layer of the base layer;

[0014] Calculated by weight percentage, the amount of antibacterial and mildew-proof resin particles added to the base layer accounts for 3.0-5.0% of the total amount of the base layer added.

[0015] Furthermore, the antibacterial and anti-mildew resin particles have a three-layer structure, which is an inner layer, a middle layer and an outer layer in sequence;

[0016] The antibacterial and anti-mildew resin particles use submicron glass or zirconium phosphate as a carrier, and the carrier is the inner layer;

[0017] The carrier is coated with water-absorbing silica gel as a water-absorbing layer, and the water-absorbing layer is the middle layer;

[0018] Silver ion salt, zinc ion salt and copper ion salt form a metal ion salt layer, which is wrapped on the surface of the water absorption layer and is the outer layer. The zinc ion salt and the copper ion salt are both attached to the surface of the silver ion salt.

[0019] The silver ion salt is a nanoparticle formed by mixing silver carbonate and silver bromide, wherein the weight ratio of the silver carbonate to the silver bromide is (1-3):1, the zinc ion salt is zinc oxide, the copper ion salt is cuprous oxide, and the weight ratio of the zinc ion salt to the copper ion salt is (1.5-2):1;

[0020] The antibacterial and mildew-proof resin particles include the following components by weight: 55-65 parts of submicron carrier, 10-20 parts of silver ion salt, 10-15 parts of zinc ion salt, 8-12 parts of copper ion salt, and 90-110 parts of water-absorbing silica gel;

[0021] The diameter of the submicron carrier is 0.2-0.5 microns; the particle diameters of the zinc ion salt and the copper ion salt are 3-10 nanometers, and the particle diameter of the silver ion salt is 50-100 nanometers.

[0022] Furthermore, the base layer also includes supplementary antibacterial and anti-mildew resin particles.

[0023] Furthermore, the inner layer of the supplementary antibacterial and mildew-proof resin particles is a submicron glass or zirconium phosphate carrier, the middle layer is a metal ion salt layer, and the outer layer is a water-absorbing layer.

[0024] Furthermore, the ratio of the antibacterial and mildew-proof resin particles to the supplementary antibacterial and mildew-proof resin particles is 1:(0.5-2).

[0025] Furthermore, the base layer also includes four layers of composite antibacterial and anti-mildew resin particles.

[0026] Furthermore, a metal ion salt layer is added outside the supplementary antibacterial and mildew-proof resin particles as the outermost layer, that is, a four-layer composite antibacterial and mildew-proof resin particle; the four-layer structure of the four-layer composite antibacterial and mildew-proof resin particle is an inner layer, a middle layer, an outer layer, and an outermost layer, the inner layer is a submicron glass or zirconium phosphate carrier, the middle layer is a metal ion salt layer, the outer layer is a water-absorbing layer, and the outermost layer is a metal ion salt layer; the ratio of the amount of metal ion salt of the outermost metal ion salt layer to that of the middle metal ion salt layer is (1-2):1.

[0027] Furthermore, the water-absorbing layer of the four-layer composite antibacterial and mildew-proof resin particles also contains moisture, and the four-layer composite antibacterial and mildew-proof resin particles contain water.

[0028] Furthermore, the water content of the four-layer water-containing composite antibacterial and mildew-proof resin particles is 20-80%.

[0029] The preparation process of the antibacterial and mildew-proof sanitary container bag specifically comprises the following steps:

[0030] Step 1, preparation of plastic woven cloth: mixing the raw materials of the plastic woven cloth layer evenly, extruding into a film, then cooling the film, cutting, stretching and forming into a flat wire, after the flat wire is cooled, weaving the flat wire into a tube material by interlacing the warp and weft, and rolling it into a plastic woven cloth;

[0031] Step 2, preparation of the base layer: using blown film and three-layer co-extrusion, adding antibacterial and mildew-proof resin particles to the base layer, the addition amount accounts for 3.0-5.0% of the total addition amount of the base layer, and when blowing the film, the screw extruder is provided with 5 heating zones from front to back, the temperatures are 167°C, 136°C, 152°C, 128°C, 155°C, the die temperature is 145-150°C, and the rotation speed is 132-145 rpm;

[0032] Step 3: Bag making, the plastic woven cloth prepared in step 1 and the base layer prepared in step 2 are placed on a composite machine, the adhesive layer raw material is heated and extruded and coated on the plastic woven cloth, and then the outer layer of the polyethylene plastic film is bonded to the plastic woven cloth through the adhesive layer, extruded and formed with a composite roller, and rolled up to make bags.

[0033] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0034] First, submicron glass or zirconium phosphate is used as a carrier. These materials have a large specific surface area and can provide good loading capacity. The antibacterial and mildew-proof resin particles are designed as a three-layer structure, with the inner layer as a carrier, the middle layer as a water-absorbing silica gel layer, and the outer layer as a metal ion salt layer. The three-layer structure enhances the stability and durability of the particles. The combined use of silver ion salts, zinc ion salts, and copper ion salts enhances the antibacterial and mildew-proof effects through synergistic effects. Zinc ion salts and copper ion salts adhere to the surface of silver ion salts, effectively reducing the migration speed of silver ions and prolonging the antibacterial effect. The water-absorbing silica gel layer can absorb and retain a certain amount of moisture, providing a moist environment for metal ions, allowing the ions to be slowly released and prolonging the antibacterial effect. The silica gel layer can also serve as a buffer layer to protect the metal ions from being quickly eroded by the external environment, further enhancing the stability of the antibacterial and mildew-proof resin particles. The design of the plastic woven cloth layer and the multi-layer polyethylene base layer makes The container bag has high strength and durability and is suitable for various transportation and storage environments. The adhesive layer ensures the close bonding between the layers and prevents separation and breakage between the layers. Through the sustained release effect of the water-absorbing silica gel, the release rate of silver ions is effectively controlled to avoid their excessive loss, thereby extending the antibacterial time of the container bag. In a humid environment, the water-absorbing silica gel can absorb and retain moisture, providing favorable conditions for the release of silver ions and improving the antibacterial efficiency. At the same time, the sustained release effect of the water-absorbing silica gel prolongs the action time of the antibacterial ingredients, allowing the container bag to maintain good antibacterial and mildew-proof properties for a long time. In addition, the microporous structure on the surface of the water-absorbing silica gel can also adsorb and fix a part of the silver ions, so that they can be quickly released when needed, enhancing the antibacterial effect. The addition of water-absorbing silica gel enhances the stability of the antibacterial and mildew-proof resin particles, reduces the loss of silver ions during storage and transportation, and ensures the antibacterial properties of the product.

[0035] Secondly, the water-absorbing layer of the supplementary antibacterial and mildew-proof resin particles is located in the outer layer, which enables the particles to absorb moisture immediately when exposed to a humid environment. Compared with the structure of the antibacterial and mildew-proof resin particles with the water-absorbing layer located in the middle layer, moisture needs to first penetrate into the interior of the particles to trigger the water-absorbing effect of the water-absorbing layer, and the effect is relatively slow; after the water-absorbing layer absorbs moisture, it will quickly swell and release the metal ions it carries. Since the water-absorbing layer is located in the outer layer, the metal ions can be released into the environment faster, thereby playing an antibacterial and mildew-proof role faster; once the water-absorbing silica gel absorbs water and swells, the metal ions it carries will be released into the environment by diffusion. Since metal ions have a smaller volume and higher activity, they can quickly penetrate the micro- The cell wall or cell membrane of the organism can be destroyed, and its internal structure can be destroyed, so as to achieve the effect of rapid antibacterial and mildew proofing; the supplementary antibacterial and mildew proofing resin particles can absorb moisture faster when exposed to a humid environment, and quickly release metal ions for antibacterial and mildew proofing, which makes the supplementary antibacterial and mildew proofing resin particles have better antibacterial effect in a humid environment that requires a quick response; through the mixed use of antibacterial and mildew proofing resin particles and supplementary antibacterial and mildew proofing resin particles, and the difference in the migration and release speed of silver ions after their respective water-absorbing layers absorb water, a gradient supply of silver ions is achieved, so that the appropriate silver ion concentration can be maintained inside the container bag at different times and locations, thereby continuously inhibiting the growth of bacteria or mold, and significantly enhancing the antibacterial and mildew proofing effect.

[0036] The three- and four-layer composite antibacterial and mildew-proof resin particles can quickly kill or inhibit the growth of a variety of microorganisms such as bacteria and mildew through the gradient release mechanism and the dual antibacterial mechanism, effectively preventing the mold and deterioration of items; the two metal ion salt layers in the four-layer composite antibacterial and mildew-proof resin particles provide a dual antibacterial effect, the outermost metal ion salt layer achieves rapid antibacterial, while the middle metal ion salt achieves a long-term and stable antibacterial effect through the regulation of the water absorption layer; the water absorption layer can serve as a buffer layer, which not only protects the metal ion salt layer from being quickly eroded by the external environment, but also regulates the release rate of the metal ion salt through its water absorption performance, thereby enhancing the stability of the antibacterial and mildew-proof resin particles;

[0037] Fourthly, water can dissolve and carry part of metal ions, promoting their diffusion to the external environment. At the same time, as a carrier, water can regulate the release rate of metal ions, making it more uniform and lasting. The water in the water-absorbing layer can be exchanged with the water in the external environment. When the humidity of the external environment is high, the water-absorbing layer can absorb more water, thereby accelerating the release of metal ions. On the contrary, in a dry environment, the water-absorbing layer releases the stored water, maintains a certain humidity, and ensures the continuous release of metal ions. Water can provide a more moist environment for antibacterial ions, which is conducive to their penetration of the cell wall or cell membrane of microorganisms, thereby enhancing the antibacterial effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic structural diagram of antibacterial and mildew-proof resin particles according to Example 1 of the present invention;

[0039] Figure 2 This is a schematic diagram of the structure of the antibacterial and mildew-proof resin particles according to the second embodiment of the present invention;

[0040] Figure 3 This is a schematic diagram of the structure of the antibacterial and mildew-proof resin particles according to Example 3 of the present invention. DETAILED DESCRIPTION

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more related listed items.

[0042] Embodiment 1: An antibacterial and mildew-proof sanitary container bag, which comprises, from outside to inside, a plastic woven cloth layer, an adhesive layer, and a base layer;

[0043] The plastic woven fabric layer is prepared from the following components in parts by weight: 100 parts of polypropylene, 20-30 parts of ethylene-propylene random copolymer, 0.7-1.2 parts of maleic anhydride grafted polypropylene, 0.3-0.5 parts of nano silicon dioxide, and 0.1-0.3 parts of a first antioxidant;

[0044] The adhesive layer is prepared from the following components in parts by weight: 100 parts of polyethylene, 35-40 parts of ethylene-methacrylic acid copolymer;

[0045] The base layer is composed of a substrate and antibacterial and anti-mildew resin particles. The substrate is composed of three layers, namely: a bottom layer, a middle layer and a surface layer;

[0046] The surface layer comprises the following components in parts by weight: 100 parts of low-density polyethylene, 10-15 parts of ethylene-vinyl acetate copolymer, 1-3 parts of calcium stearate, and 0.1-0.3 parts of a second antioxidant;

[0047] The middle layer comprises the following components in parts by weight: 100 parts of linear low-density polyethylene, 15-20 parts of high-density polyethylene, 10-15 parts of ethylene-vinyl alcohol copolymer, 0.1-0.3 parts of a second antioxidant, and 0.1-0.3 parts of a lubricant;

[0048] The bottom layer comprises the following components in parts by weight: 100 parts of low-density polyethylene, 50-60 parts of linear low-density polyethylene, and 20-30 parts of metallocene polyethylene;

[0049] The antibacterial and mildew-proof resin particles are located in the bottom layer and the middle layer or the middle layer and the surface layer of the base layer; by weight percentage, the amount of the antibacterial and mildew-proof resin particles added in the base layer accounts for 3.0-5.0% of the total amount of the base layer added;

[0050] like Figure 1 As shown, the antibacterial and mildew-proof resin particles have a three-layer structure, which is an inner layer, a middle layer and an outer layer in sequence; the antibacterial and mildew-proof resin particles use submicron glass or zirconium phosphate as a carrier, and the carrier is the inner layer; the carrier is coated with water-absorbing silica gel as a water-absorbing layer, and the water-absorbing layer is the middle layer; silver ion salt, zinc ion salt, and copper ion salt form a metal ion salt layer, which is wrapped on the surface of the water-absorbing layer and is the outer layer, and the zinc ion salt and the copper ion salt are both attached to the surface of the silver ion salt;

[0051] The silver ion salt is a nanoparticle formed by mixing silver carbonate and silver bromide, wherein the weight ratio of the silver carbonate to the silver bromide is (1-3):1, the zinc ion salt is zinc oxide, the copper ion salt is cuprous oxide, and the weight ratio of the zinc ion salt to the copper ion salt is (1.5-2):1;

[0052] The antibacterial and mildew-proof resin particles include the following components by weight: 55-65 parts of submicron carrier, 10-20 parts of silver ion salt, 10-15 parts of zinc ion salt, 8-12 parts of copper ion salt, and 90-110 parts of water-absorbing silica gel;

[0053] The diameter of the submicron carrier is 0.2-0.5 microns; the particle diameter of the zinc ion salt and the copper ion salt is 3-10 nanometers, and the particle diameter of the silver ion salt is 50-100 nanometers;

[0054] A preparation process of an antibacterial and mildew-proof sanitary container bag specifically comprises the following steps:

[0055] Step 1, preparation of plastic woven cloth: mixing the raw materials of the plastic woven cloth layer evenly, extruding into a film, then cooling the film, cutting, stretching and forming into a flat wire, after the flat wire is cooled, weaving the flat wire into a tube material by interlacing the warp and weft, and rolling it into a plastic woven cloth;

[0056] Step 2, preparation of the base layer: using blown film and three-layer co-extrusion, adding antibacterial and mildew-proof resin particles to the base layer, the addition amount accounts for 3.0-5.0% of the total addition amount of the base layer, and when blowing the film, the screw extruder is provided with 5 heating zones from front to back, the temperatures are 167°C, 136°C, 152°C, 128°C, 155°C, the die temperature is 145-150°C, and the rotation speed is 132-145 rpm;

[0057] Step 3: Bag making, the plastic woven cloth prepared in step 1 and the base layer prepared in step 2 are placed on a composite machine, the adhesive layer raw material is heated and extruded and coated on the plastic woven cloth, and then the outer layer of the polyethylene plastic film is bonded to the plastic woven cloth through the adhesive layer, extruded and formed with a composite roller, and rolled up to make bags.

[0058] The following experiment was conducted for this embodiment, which is Experiment 1. The weight parts of the components in Experiment 1 are as follows: the antibacterial and mildew-proof resin particles include the following components by weight: 60 parts by weight of submicron glass, 100 parts by weight of water-absorbing silica gel, 15 parts by weight of silver ion salt, 13 parts by weight of zinc ion salt and 10 parts by weight of copper ion salt;

[0059] The silver ion salt is a mixture of silver carbonate and silver bromide in a weight ratio of 2:1, and the weight ratio between the zinc ion salt and the copper ion salt is 2:1; the surface layer of the base layer includes the following components in weight parts: 100 parts of low-density polyethylene, 13 parts of ethylene-vinyl acetate copolymer, 3 parts of calcium stearate, and 0.2 parts of a second antioxidant; the middle layer includes the following components in weight parts: 100 parts of linear low-density polyethylene, 17 parts of high-density polyethylene, 13 parts of ethylene-vinyl alcohol copolymer, 0.2 parts of a second antioxidant, and 0.2 parts of a lubricant; the bottom layer includes the following components in weight parts: 100 parts of low-density polyethylene, 55 parts of linear low-density polyethylene, and 25 parts of metallocene polyethylene;

[0060] The container bags prepared in Experiment 1 were subjected to antibacterial tests and sustained-release effect tests;

[0061] The comparative experiment uses a patented method with application number CN202110560627.2 to prepare antibacterial and mildew-proof resin particles. The difference between the comparative experiment and Experiment 1 is that the antibacterial and mildew-proof resin particles do not contain a water-absorbing layer.

[0062] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0063] Submicron glass or zirconium phosphate is used as a carrier. These materials have a large specific surface area and can provide good loading capacity. The antibacterial and mildew-proof resin particles are designed as a three-layer structure, with the inner layer as a carrier, the middle layer as a water-absorbing silica gel layer, and the outer layer as a metal ion salt layer. The three-layer structure enhances the stability and durability of the particles. The combined use of silver ion salt, zinc ion salt and copper ion salt enhances the antibacterial and mildew-proof effect through synergistic effect. Zinc ion salt and copper ion salt adhere to the surface of silver ion salt, effectively reducing the migration speed of silver ions and prolonging the antibacterial effect. The water-absorbing silica gel layer can absorb and retain a certain amount of moisture, providing a moist environment for metal ions, allowing the ions to be slowly released and prolonging the antibacterial effect. The silica gel layer can also serve as a buffer layer to protect metal ions from being quickly eroded by the external environment, further enhancing the stability of the antibacterial and mildew-proof resin particles. The design of the plastic woven cloth layer and the multi-layer polyethylene base layer makes the container bag have high strength and durability, suitable for various transportation and storage environments. The adhesive layer ensures the close bonding between the layers and prevents separation and breakage between the layers.

[0064] Water-absorbing silica gel is a highly absorbent material that can quickly absorb and retain a large amount of water. Adding a water-absorbing silica gel layer to the antibacterial and mildew-proof resin particles can form a microenvironment that can maintain a certain humidity under humid conditions, which is conducive to the slow release of antibacterial ingredients such as silver ions. This slow-release mechanism can prolong the action time of antibacterial ingredients and improve their durability. The surface of the water-absorbing silica gel has a large number of microporous structures, which not only increase its specific surface area, but also provide abundant ion exchange sites. When the container bag is in a humid environment, the water-absorbing silica gel can absorb and store moisture in the environment. At the same time, the microporous structure on its surface can also absorb and fix a part of the silver ions, thereby slowing down the release rate of silver ions and preventing them from being lost too quickly. The water absorption performance of the water-absorbing silica gel changes with the change of environmental humidity. In an environment with high humidity, the water-absorbing silica gel can absorb more water, thereby increasing the humidity around the antibacterial and mildew-proof resin particles, which is conducive to the release of silver ions. In a dry environment, the water-absorbing silica gel can release the stored moisture, maintain a certain humidity, and ensure the continuous release of silver ions.

[0065] The silver ion salt, zinc ion salt and copper ion salt in the antibacterial and mildew-proof resin particles all have good antibacterial properties. These ions destroy the cell membrane structure of bacteria or molds and make them inactive, thereby achieving the purpose of antibacterial and mildew-proof. At the same time, there is a synergistic effect between these ions. Silver ions, zinc ions and copper ions have different antibacterial mechanisms. They can complement each other and work together on bacteria or molds to improve the antibacterial effect. Silver ions mainly bind to the sulfhydryl groups in bacterial cells to destroy the DNA replication process of cells; while zinc ions and copper ions can bind to the cell membrane to destroy the integrity of the cell membrane, causing the leakage of cell contents. Zinc ion salts and copper ion salts adhere to the surface of silver ion salt particles, which can effectively slow down the migration speed of silver ions, reduce the loss of silver ions, and prolong the antibacterial and mildew-proof time; the antibacterial and mildew-proof resin particles are dispersed in the base layer of the container bag, and the inside of the container bag is continuously antibacterial by ion release, which effectively improves the antibacterial and mildew-proof properties of the container bag;

[0066] Through the sustained release effect of water-absorbent silica gel, the release rate of silver ions is effectively controlled, avoiding their rapid loss, thereby extending the antibacterial time of the container bag; in a humid environment, water-absorbent silica gel can absorb and retain moisture, providing favorable conditions for the release of silver ions and improving the antibacterial efficiency. At the same time, the sustained release effect of water-absorbent silica gel extends the action time of the antibacterial ingredients, allowing the container bag to maintain good antibacterial and mildew-proof properties for a long time; in addition, the microporous structure on the surface of water-absorbent silica gel can also adsorb and fix a part of the silver ions, so that they can be quickly released when needed, enhancing the antibacterial effect; the addition of water-absorbent silica gel enhances the stability of the antibacterial and mildew-proof resin particles, reduces the loss of silver ions during storage and transportation, and ensures the antibacterial properties of the product.

[0067] Embodiment 2: Embodiment 1 introduces a water-absorbing layer into the antibacterial and mildew-proof resin particles and utilizes the sustained-release effect of the water-absorbing silica gel to effectively control the release rate of silver ions and avoid their excessive loss, thereby extending the antibacterial time of the container bag. In order to further improve the antibacterial and mildew-proof properties of the container bag, further improvements are made on the basis of Embodiment 1.

[0068] like Figure 2 As shown, the base layer also includes supplementary antibacterial and mildew-proof resin particles, the inner layer of the supplementary antibacterial and mildew-proof resin particles is a submicron glass or zirconium phosphate carrier, the middle layer is a metal ion salt layer, and the outer layer is a water-absorbing layer;

[0069] The ratio of the antibacterial and anti-mildew resin particles to the supplementary antibacterial and anti-mildew resin particles is 1:(0.5-2).

[0070] For this embodiment, Experiment 2 was conducted on the basis of Experiment 1 of Embodiment 1. The difference between Experiment 2 and Experiment 1 is that supplementary antibacterial and mildew-proof resin particles are further added to the base layer, and the ratio of the antibacterial and mildew-proof resin particles to the supplementary antibacterial and mildew-proof resin particles is 1:1.

[0071] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0072] The water-absorbing layer of the supplementary antibacterial and mildew-proof resin particles is located in the outer layer, which enables the particles to absorb moisture immediately when they come into contact with a humid environment. Compared with the structure of the antibacterial and mildew-proof resin particles in which the water-absorbing layer is located in the middle layer, moisture needs to first penetrate into the interior of the particles to trigger the water-absorbing effect of the water-absorbing layer, and the effect is relatively slow; after the water-absorbing layer absorbs moisture, it will quickly swell and release the metal ions it carries. Since the water-absorbing layer is located in the outer layer, the metal ions can be released into the environment faster, thereby playing an antibacterial and mildew-proof role faster; once the water-absorbing silica gel absorbs water and swells, the metal ions it carries will be released into the environment by diffusion. Since metal ions have a small volume and high activity, they can quickly penetrate the cell wall or cell membrane of microorganisms and destroy their internal structure, thereby achieving a rapid antibacterial and mildew-proof effect; the supplementary antibacterial and mildew-proof resin particles can absorb moisture faster when in contact with a humid environment, and quickly release metal ions for antibacterial and mildew-proofing, which enables the supplementary antibacterial and mildew-proof resin particles to have a better antibacterial effect in a humid environment that requires a quick response;

[0073] Since the metal ion salt layer of the antibacterial and mildew-proof resin particles is in the outer layer, when the particles come into contact with water, the water-absorbing layer will first absorb water and slowly release the water to the outside, while driving some metal ions to be gradually released, making the release of antibacterial ions more uniform and lasting, with a slow initial release rate and a relatively uniform release rate, which is more suitable for occasions requiring long-term antibacterial and mildew-proofing, such as goods that are stored for a long time or need long-term transportation; since the metal ion salt layer of the supplementary antibacterial and mildew-proof resin particles is located in the middle layer and the water-absorbing layer is in the outer layer, when the particles come into contact with water, the water-absorbing layer will quickly absorb water and begin to slowly release, while directly promoting the release of metal ions in the middle layer, making the antibacterial ions release faster in the initial stage, so that the antibacterial ions are released into the environment faster, thereby providing a stronger antibacterial effect in a short period of time, such as goods that are stored for a short period of time or have a fast turnover, which can quickly inhibit the growth and reproduction of microorganisms, thereby providing stronger protection in a short period of time;

[0074] By mixing antibacterial and mildew-proof resin particles with supplementary antibacterial and mildew-proof resin particles, and the differences in the migration and release rates of silver ions after their respective water-absorbing layers absorb water, a gradient supply of silver ions is achieved, so that the appropriate silver ion concentration can be maintained inside the container bag at different times and locations, thereby continuously inhibiting the growth of bacteria or mold and significantly enhancing the antibacterial and mildew-proof effects.

[0075] Example 3: The above-mentioned Example 2 introduces supplementary antibacterial and mildew-proof resin particles, and mixes the antibacterial and mildew-proof resin particles with the supplementary antibacterial and mildew-proof resin particles. Through the difference in the migration and release speed of silver ions after their respective water-absorbing layers absorb water, a gradient supply of silver ions is achieved, thereby enhancing the antibacterial and mildew-proof effect. In order to further improve the antibacterial and mildew-proof effect, further improvements are made on the basis of Example 2.

[0076] like Figure 3 As shown, the base layer also includes four layers of composite antibacterial and anti-mildew resin particles;

[0077] Among them, the four-layer composite antibacterial and mildew-proof resin particles are, that is, a metal ion salt layer is added outside the supplementary antibacterial and mildew-proof resin particles as the outermost layer; the four-layer structure of the four-layer composite antibacterial and mildew-proof resin particles is an inner layer, a middle layer, an outer layer, and an outermost layer in sequence, the inner layer is a submicron glass or zirconium phosphate carrier, the middle layer is a metal ion salt layer, the outer layer is a water-absorbing layer, and the outermost layer is a metal ion salt layer;

[0078] The usage ratio of the metal ion salt in the outermost metal ion salt layer and the middle metal ion salt layer is (1-2):1.

[0079] For this embodiment, Experiment 3 was conducted on the basis of Experiment 2 in Example 2. The difference between Experiment 3 and Experiment 2 is that the antibacterial and mildew-proof resin particles and the supplementary antibacterial and mildew-proof resin particles in Experiment 2 were replaced by four layers of composite antibacterial and mildew-proof resin particles.

[0080] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0081] The four-layer composite antibacterial and mildew-proof resin particles achieve a gradient release of silver ions through the differences in water absorption speed and silver ion migration rate between different layers. Due to the different water absorption speeds and release mechanisms of each layer, silver ions can be released at different rates in different time periods, thereby maintaining a lasting antibacterial and mildew-proof effect; the outermost metal ion salt layer on the particle surface directly contacts with microorganisms such as bacteria and molds, and quickly kills or inhibits the growth of microorganisms by destroying their cell walls, cell membranes and protein synthesis. At the same time, the silver ions in the middle metal ion salt layer are continuously released, further consolidating the antibacterial and mildew-proof effect;

[0082] The four-layer composite antibacterial and mildew-proof resin particles can quickly kill or inhibit the growth of a variety of bacteria, molds and other microorganisms through the gradient release mechanism and the dual antibacterial mechanism, effectively preventing the mold and deterioration of items; the two metal ion salt layers in the four-layer composite antibacterial and mildew-proof resin particles provide a dual antibacterial effect, the outermost metal ion salt layer achieves rapid antibacterial, while the middle metal ion salt achieves a long-term and stable antibacterial effect through the regulation of the water absorption layer; the water absorption layer can serve as a buffer layer, which not only protects the metal ion salt layer from being quickly eroded by the external environment, but also regulates the release rate of the metal ion salt through its water absorption performance, thereby enhancing the stability of the antibacterial and mildew-proof resin particles;

[0083] The four-layer composite structure makes the release of metal ion salt more gradient. In the initial stage, the outermost metal ion salt layer quickly releases antibacterial ions. As time goes by, the water-absorbing layer absorbs water and swells, promoting the slow release of the middle metal ion salt layer, thereby maintaining the appropriate antibacterial ion concentration at different times and locations. Due to the gradient release of metal ions and the regulating effect of the water-absorbing layer, the four-layer composite antibacterial and mildew-proof resin particles can achieve higher antibacterial effects in a shorter time and maintain this effect for a long time.

[0084] Example 4: The above-mentioned Example 3 is further improved on the basis of Example 3 by coating the water-absorbing layer of the antibacterial and mildew-proof resin particles with a metal ion salt layer as the outermost layer to form four layers of composite antibacterial and mildew-proof resin particles, so that the release of the metal ion salt is more gradient, thereby enhancing the antibacterial and mildew-proof effect.

[0085] The water-absorbing layer of the four-layer composite antibacterial and anti-mildew resin particles also contains water, which is a water-containing four-layer composite antibacterial and anti-mildew resin particle;

[0086] The water content of the four-layer composite antibacterial and mildew-proof resin particles is 20-80%.

[0087] For this scheme, experiments 4, 5 and 6 were conducted on the basis of experiment 3 of embodiment 3. The water content of the four-layer composite antibacterial and mildew-proof resin particles in experiment 4 was 20%, the water content of the four-layer composite antibacterial and mildew-proof resin particles in experiment 5 was 50%, and the water content of the four-layer composite antibacterial and mildew-proof resin particles in experiment 6 was 80%;

[0088] The ratio of the four-layer composite antibacterial and mildew-proof resin particles without moisture to the four-layer composite antibacterial and mildew-proof resin particles with moisture is 1:(0.5-2);

[0089] According to this scheme, Experiment 7 was conducted. In Experiment 7, the ratio of the four-layer composite antibacterial and mildew-proof resin particles without moisture to the four-layer composite antibacterial and mildew-proof resin particles with moisture was 1:1, wherein the moisture content of the four-layer composite antibacterial and mildew-proof resin particles with moisture was 50%.

[0090] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0091] Water can dissolve and carry part of metal ions, promoting their diffusion to the external environment. At the same time, as a carrier, water can regulate the release rate of metal ions, making it more uniform and lasting. The water in the water-absorbing layer can be exchanged with the water in the external environment. When the humidity of the external environment is high, the water-absorbing layer can absorb more water, thereby accelerating the release of metal ions. Conversely, in a dry environment, the water-absorbing layer releases the stored water to maintain a certain humidity and ensure the continuous release of metal ions. Water can provide a more moist environment for antibacterial ions, which is conducive to their penetration of the cell wall or cell membrane of microorganisms, thereby enhancing the antibacterial effect.

[0092] In the four-layer composite antibacterial and mildew-proof granules containing water, the release of metal ions is more gradient due to the presence of water. In the early stage, the outer metal ion salt layer quickly releases antibacterial ions; with the absorption and release of water, the antibacterial ions of the middle metal ion salt layer are gradually released, forming a long-term antibacterial effect; water can promote the diffusion and penetration of metal ions, so that they can contact microorganisms faster, thereby enhancing the antibacterial effect. At the same time, a humid environment is also conducive to destroying the cell structure of microorganisms and improving their antibacterial efficiency; the four-layer composite antibacterial and mildew-proof granules containing water can better adapt to the use environment with different humidity. In a humid environment, the water absorption layer can absorb more water and accelerate the release of metal ions; in a dry environment, it can release the stored water and maintain a certain antibacterial effect; the appropriate moisture content can keep the internal structure of the resin particles stable and avoid the performance degradation caused by excessive drying or wetting. At the same time, water can also serve as a buffer layer to protect metal ions from being quickly eroded by the external environment. By releasing antibacterial components and enhancing the antibacterial effect in a gradient manner, the four-layer composite antibacterial and mildew-proof granules containing water can extend the antibacterial and mildew-proof cycle of the container bag and reduce the replacement frequency.

[0093] Performance testing: Prepare the container bag samples for each experiment as the test object. The antibacterial test refers to GB / T20944.3-2008 "Evaluation of antibacterial properties of textiles Part 3: Oscillation method". The antibacterial performance is tested in an environment with a relative humidity of 70%-100%. The test bacteria are Escherichia coli and Staphylococcus aureus.

[0094] Sustained-release effect test: Use a spectrophotometer to detect the metal ion concentration; place the container bag at a relative humidity of 70%-100% and room temperature, and regularly detect the metal ion concentration released by the antibacterial and mildew-proof resin particles on its surface or inside; place the container bag sample in an environment with set humidity and temperature, take the solution on the sample surface or extract the metal ions inside the sample once every 24 hours, and record the metal ion concentration of each test; the test results are shown in the following table:

[0095]

[0096]

[0097] In the comparative experiment, antibacterial and mildew-proof resin particles without a water-absorbing layer were used. In a humid environment containing water, the antibacterial effect and sustained-release days were relatively low. By introducing three-layer antibacterial and mildew-proof resin particles and water-absorbing silica gel, the sustained-release effect significantly improved the antibacterial effect and sustained-release days. Supplementary antibacterial and mildew-proof resin particles were added to the three-layer particles, and the antibacterial effect was further enhanced through the gradient release mechanism. The four-layer composite antibacterial and mildew-proof resin particles achieved a more gradient release and a stronger antibacterial effect. The four-layer composite antibacterial and mildew-proof resin particles with different water contents were mixed with the four-layer composite antibacterial and mildew-proof resin particles, and the best antibacterial effect and the longest sustained-release days were achieved through the double gradient release mechanism.

[0098] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An antibacterial and mildew-proof sanitary container bag, characterized in that: From outside to inside, there are plastic woven fabric layer, adhesive layer and base layer; The plastic woven fabric layer is prepared from the following components in parts by weight: 100 parts of polypropylene, 20-30 parts of ethylene-propylene random copolymer, 0.7-1.2 parts of maleic anhydride grafted polypropylene, 0.3-0.5 parts of nano silicon dioxide, and 0.1-0.3 parts of a first antioxidant; The adhesive layer is prepared from the following components in parts by weight: 100 parts of polyethylene, 35-40 parts of ethylene-methacrylic acid copolymer; The base layer is composed of a substrate and antibacterial and anti-mildew resin particles. The substrate is composed of three layers, namely: a bottom layer, a middle layer and a surface layer; The surface layer comprises the following components in parts by weight: 100 parts of low-density polyethylene, 10-15 parts of ethylene-vinyl acetate copolymer, 1-3 parts of calcium stearate, and 0.1-0.3 parts of a second antioxidant; The middle layer comprises the following components in parts by weight: 100 parts of linear low-density polyethylene, 15-20 parts of high-density polyethylene, 10-15 parts of ethylene-vinyl alcohol copolymer, 0.1-0.3 parts of a second antioxidant, and 0.1-0.3 parts of a lubricant; The bottom layer comprises the following components in parts by weight: 100 parts of low-density polyethylene, 50-60 parts of linear low-density polyethylene, and 20-30 parts of metallocene polyethylene; The antibacterial and anti-mildew resin particles are located in the bottom layer and the middle layer or the middle layer and the surface layer of the base layer; Calculated by weight percentage, the amount of antibacterial and mildew-proof resin particles added to the base layer accounts for 3.0-5.0% of the total amount of the base layer added.

2. The antibacterial and mildew-proof sanitary container bag according to claim 1, characterized in that: The antibacterial and anti-mildew resin particles have a three-layer structure, which is the inner layer, the middle layer and the outer layer; The antibacterial and anti-mildew resin particles use submicron glass or zirconium phosphate as a carrier, and the carrier is the inner layer; The carrier is coated with water-absorbing silica gel as a water-absorbing layer, and the water-absorbing layer is the middle layer; Silver ion salt, zinc ion salt and copper ion salt form a metal ion salt layer, which is wrapped on the surface of the water absorption layer and is the outer layer. The zinc ion salt and the copper ion salt are attached to the surface of the silver ion salt. The silver ion salt is a nanoparticle formed by mixing silver carbonate and silver bromide, wherein the weight ratio of the silver carbonate to the silver bromide is (1-3):1, the zinc ion salt is zinc oxide, the copper ion salt is cuprous oxide, and the weight ratio of the zinc ion salt to the copper ion salt is (1.5-2):1; The antibacterial and mildew-proof resin particles include the following components by weight: 55-65 parts of submicron carrier, 10-20 parts of silver ion salt, 10-15 parts of zinc ion salt, 8-12 parts of copper ion salt, and 90-110 parts of water-absorbing silica gel; The diameter of the submicron carrier is 0.2-0.5 microns; the particle diameters of the zinc ion salt and the copper ion salt are 3-10 nanometers, and the particle diameter of the silver ion salt is 50-100 nanometers.

3. The antibacterial and mildew-proof sanitary container bag according to claim 2, characterized in that: Supplementary antibacterial and anti-mildew resin particles are also included in the base layer.

4. The antibacterial and mildew-proof sanitary container bag according to claim 3, characterized in that: The inner layer of the supplementary antibacterial and anti-mildew resin particles is a submicron glass or zirconium phosphate carrier, the middle layer is a metal ion salt layer, and the outer layer is a water-absorbing layer.

5. The antibacterial and mildew-proof sanitary container bag according to claim 3, characterized in that: The ratio of the antibacterial and anti-mildew resin particles to the supplementary antibacterial and anti-mildew resin particles is 1:(0.5-2).

6. The antibacterial and mildew-proof sanitary container bag according to claim 3, characterized in that: The base layer also includes four layers of composite antibacterial and anti-mildew resin particles.

7. The antibacterial and mildew-proof sanitary container bag according to claim 6, characterized in that: A metal ion salt layer is added outside the supplementary antibacterial and mildew-proof resin particles as the outermost layer, that is, a four-layer composite antibacterial and mildew-proof resin particle; the four-layer structure of the four-layer composite antibacterial and mildew-proof resin particle is an inner layer, a middle layer, an outer layer, and an outermost layer, the inner layer is a submicron glass or zirconium phosphate carrier, the middle layer is a metal ion salt layer, the outer layer is a water-absorbing layer, and the outermost layer is a metal ion salt layer; the ratio of the amount of metal ion salt of the outermost metal ion salt layer to that of the middle metal ion salt layer is (1-2):

1.

8. The antibacterial and mildew-proof sanitary container bag according to claim 6, characterized in that: The water-absorbing layer of the four-layer composite antibacterial and mildew-proof resin particles also contains moisture, and the four-layer composite antibacterial and mildew-proof resin particles contain water.

9. The antibacterial and mildew-proof sanitary container bag according to claim 8, characterized in that: The water content of the four-layer composite antibacterial and anti-mildew resin particles is 20-80%.

10. A process for preparing the antibacterial and mildew-proof sanitary container bag according to any one of claims 1 to 9, characterized in that: The specific steps include: Step 1, preparation of plastic woven cloth: mixing the raw materials of the plastic woven cloth layer evenly, extruding into a film, then cooling the film, cutting, stretching and forming into a flat wire, after the flat wire is cooled, weaving the flat wire into a tube material by interlacing the warp and weft, and rolling it into a plastic woven cloth; Step 2, preparation of the base layer: using blown film and three-layer co-extrusion, adding antibacterial and mildew-proof resin particles to the base layer, the addition amount accounts for 3.0-5.0% of the total addition amount of the base layer, and when blowing the film, the screw extruder is provided with 5 heating zones from front to back, the temperatures are 167°C, 136°C, 152°C, 128°C, 155°C, the die temperature is 145-150°C, and the rotation speed is 132-145 rpm; Step 3: Bag making, the plastic woven cloth prepared in step 1 and the base layer prepared in step 2 are placed on a composite machine, the adhesive layer raw material is heated and extruded and coated on the plastic woven cloth, and then the outer layer of the polyethylene plastic film is bonded to the plastic woven cloth through the adhesive layer, extruded and formed with a composite roller, and rolled up to make bags.

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