Environment-friendly antibacterial film

Abstract

The environment-friendly antibacterial film sequentially comprises an inner base layer, a hot melt adhesive layer and at least one PBS grid layer, the PBS grid layer is divided into a grid inner layer and a grid outer layer in the direction parallel to the layer face, the grid inner layer is adhered to the hot melt adhesive layer, and the grid outer layer protrudes out of the outer side environment of the hot melt adhesive layer. The antibacterial dry powder particles are adhered to the hot melt adhesive layer in meshes of the PBS grid layer, part of the outer surfaces of the antibacterial dry powder particles are adhered by the hot melt adhesive layer, the other part of the outer surfaces of the antibacterial dry powder particles are exposed in the outer environment of the hot melt adhesive layer, and the antibacterial dry powder particles do not protrude out of the outer side of the PBS grid outer layer. In this way, abrasion or taking-away caused by friction in the processes of post-processing, transportation, finished product use and the like of the bacteriostatic dry powder particles is reduced as much as possible, the service life of the bacteriostatic dry powder particles is prolonged, meanwhile, the grid structure has the telescopic capacity to a certain degree, and post-processing of downstream manufacturers is facilitated; and the adopted raw materials can be recycled or degraded, so that the environment-friendly material is environment-friendly.

Description

Technical Field

[0001] The utility model belongs to the technical field of membranes, and in particular relates to an environmentally friendly antibacterial membrane. Background Art

[0002] With the improvement of modern people's living standards, the requirements for keeping items clean and hygienic are also increasing. Film materials with antibacterial effects have come into being. Antibacterial film materials generally contain metal ions such as silver ions, titanium dioxide or vanillin compounds. After processing and forming, the antibacterial film materials are mostly compounded with other materials through processing technology to form an antibacterial layer on the surface of the finished product. They are widely used in the field of packaging products.

[0003] Patent document with application number 201710480835.5 discloses an antibacterial film, a preparation method thereof and a packaging material comprising the same. The antibacterial film comprises a substrate layer, an antibacterial coating is arranged on a surface of the substrate layer, the thickness of the antibacterial coating is 0.05 to 0.5 μm, the antibacterial coating comprises a substrate and nano-TiO2 dispersed in the substrate, and the weight content of nano-TiO2 in the antibacterial coating is 0.5 to 10 wt%.

[0004] This prior art designs an extremely thin antibacterial coating so that some of the nano-TiO2 particles in the antibacterial coating tend to flatten and protrude from the surface of the antibacterial coating, thereby increasing the proportion of nano-TiO2 distributed on the surface of the antibacterial coating. The nano-TiO2 can use its porous structure to adsorb bacteria, and then the hydroxyl radicals and oxygen ions generated by it oxidize and reduce organic matter such as bacteria, thereby achieving the purpose of decomposition and antibacterial.

[0005] However, although nano-TiO2 has good antibacterial and antibacterial effects when exposed to the outside, it is easily worn or carried away due to friction during processing, transportation, and use of finished products, which leads to a decrease in the antibacterial and antibacterial effects.

[0006] The applicant has long been committed to research and development and improvement in the membrane field and believes that there is room for improvement in this technology. The utility model aims to structurally design the material layer to minimize the antibacterial particles exposed to the outside being carried away due to friction, thereby prolonging the antibacterial effect of the membrane. Summary of the invention

[0007] In view of the problems in the related technology, the utility model proposes an environmentally friendly antibacterial film to overcome the above technical problems existing in the existing related technology.

[0008] The technical solution of the utility model is achieved in this way:

[0009] An environmentally friendly antibacterial film comprises an inner base layer, a hot melt adhesive layer and at least one PBS grid layer in sequence.

[0010] The PBS grid layer is divided into a grid inner layer and a grid outer layer along a direction parallel to the plane.

[0011] The mesh inner layer is adhered to by the hot melt adhesive layer, and then directly or indirectly adhered to at least one side of the inner base layer through the hot melt adhesive layer.

[0012] The mesh outer layer protrudes from the outer environment of the hot melt adhesive layer.

[0013] The hot melt adhesive layer in the mesh of the PBS grid layer is adhered with antibacterial dry powder particles, part of the outer surface of the antibacterial dry powder particles is adhered by the hot melt adhesive layer, and another part of the outer surface is exposed to the outer environment of the hot melt adhesive layer, and the antibacterial dry powder particles do not protrude from the outside of the grid outer layer.

[0014] First, since most of the friction scenarios of daily necessities are surface contact, the utility model is designed that the antibacterial dry powder particles are sunken in the mesh of the PBS grid layer, so that when the utility model is rubbed, it is the PBS grid layer that is directly in contact, thereby minimizing the wear or removal of the antibacterial dry powder particles due to friction during post-processing, transportation, and finished product use, thereby extending the service life of the utility model. At the same time, since the PBS grid layer is a grid structure, a relatively large antibacterial surface is still retained, thereby ensuring the antibacterial effect of the utility model;

[0015] Secondly, the grid structure design of the PBS grid layer has another function. Most antibacterial dry powder particles tend to agglomerate when sprayed and fall, and then are unevenly distributed on the surface of the film layer. The grid structure with evenly distributed ups and downs is conducive to guiding the uniform distribution of antibacterial dry powder particles. At the same time, the grid structure has a certain degree of expansion and contraction ability, which is convenient for downstream manufacturers to carry out post-processing.

[0016] Finally, the raw material of the main structure "PBS mesh layer" of the utility model is polybutylene succinate (PBS), which is a degradable material. The hot melt adhesive layer is designed considering that the hot melt adhesive is non-volatile and there is no VOCs emission during use. The hot melt adhesive waste can be recycled in a variety of ways later. That is, the utility model is environmentally friendly.

[0017] The production process for realizing the layer structure design is detailed in the embodiment.

[0018] It should be noted that the utility model emphasizes that the mesh layer is a PBS mesh layer, because PBS has better mechanical strength, film forming property and heat resistance, but in essence the mesh layer can also be produced with other degradable materials, depending on the application scenario of the final product. Therefore, in addition to PBS materials, starch-based plastics, PHA, PBA, PLA, PBSA and other degradable materials can also be used to produce the mesh structure to replace the PBS mesh layer. The mesh structure can be realized by a variety of processes such as the template method, which is a common prior art and will not be described in detail here.

[0019] Considering that the utility model generally needs to be post-processed and compounded with other materials after being sold to downstream manufacturers, and the post-processing mostly involves stretching, bending and other processes, it is preferred that the PBS grid layer is provided with at least two layers, which are sequentially superimposed and laid on at least one side of the inner base layer;

[0020] The PBS mesh layers on the inner side are all covered by the hot melt adhesive layer, which mainly serves to improve the mechanical properties of the utility model and facilitate later processing;

[0021] The PBS grid layer at the outermost side is divided into the grid inner layer and the grid outer layer along the direction parallel to the plane. The grid inner layer is for the hot melt adhesive layer to adhere, and the grid outer layer protrudes from the outer environment of the hot melt adhesive layer. The hot melt adhesive layer in the mesh of the PBS grid layer at the outermost side adheres the antibacterial dry powder particles.

[0022] In actual post-processing steps such as bending and folding, the PBS mesh layer on the outside is subjected to a greater tensile force than the structural layer on the inside, that is, the structural layer on the outside needs more flexible stretchability, so preferably, the mesh width of the single-layer PBS mesh layer is the same, which is convenient for production;

[0023] The mesh width between the layers of the at least two PBS mesh layers gradually expands from the inner base layer outward along the thickness direction, and the mesh width of the PBS mesh layers at different positions is specifically designed, so that the stretchability of the utility model gradually increases from the inner base layer outward along the thickness direction;

[0024] At the same time, the thickness between the layers of at least two layers of the PBS mesh layer gradually increases from the inner base layer along the thickness direction outward, and the tensile strength that each PBS mesh layer can withstand from the inner base layer along the thickness direction outward also gradually increases, and the post-bonding processing step treats the present invention.

[0025] Although the PBS mesh layer designed in the utility model is only 30-50 μm, too many layers will increase the difficulty of bonding and compounding, and also affect the softness and deformability of the film. Therefore, more preferably, the PBS mesh layer is provided with three layers, which are respectively provided as the first PBS mesh layer, the second PBS mesh layer and the third PBS mesh layer;

[0026] The first PBS mesh layer and the second PBS mesh layer on the inner side are covered by the hot melt adhesive layer, thereby improving the mechanical properties of the utility model;

[0027] The third PBS grid layer at the outermost side is divided into the grid inner layer and the grid outer layer along the direction parallel to the plane. The grid inner layer is for the hot melt adhesive layer to adhere, and the grid outer layer protrudes from the outer environment of the hot melt adhesive layer. The hot melt adhesive layer in the mesh of the third PBS grid layer adheres the antibacterial dry powder particles.

[0028] Preferably, the mesh widths of the first PBS grid layer, the second grid layer and the third grid layer are sequentially arranged in a ratio of 0.5-1.5:2-4:4-6, so that the tolerable tensile strength is distributed in a gradient, which is in line with the tensile strength to which the utility model is subjected during the processing.

[0029] More preferably, the mesh widths of the first PBS grid layer, the second grid layer and the third grid layer are 0.1 mm, 0.3 mm and 0.5 mm, mainly to avoid excessive exposure of the antibacterial dry powder particles to further reduce friction, and to consider that the grid elements of the membrane appearance should not be too obvious to avoid limiting the style design of downstream products.

[0030] Essentially, the mesh of the PBS grid layer can be made into any shape, such as circular, triangular, hexagonal, etc. Preferably, the PBS grid layer is a diamond grid structure, which can better cooperate with the tensile processing, bending, etc.

[0031] More preferably, the two symmetry axes of the diamond meshes of the PBS grid layer having a diamond grid structure are respectively parallel to the transverse side and the longitudinal side of the inner base layer, which conforms to the stretching direction of the present invention in most post-processing steps.

[0032] Most of the existing antibacterial film products use extremely fine antibacterial raw materials less than 100 nanometers, which have poor fluidity and bring great processing difficulty. In essence, consumers have antibacterial needs for daily necessities, but the requirements are not high. The antibacterial effect achieved by antibacterial raw materials less than 100 nanometers has not increased exponentially, which increases production costs and does not meet consumer needs. Instead, it increases consumers' purchase costs. Therefore, preferably, the antibacterial dry powder particles are titanium dioxide silver-loaded particles with a particle size of 120 to 180 nm. Nano-titanium dioxide silver-loaded has a better antibacterial effect; at the same time, the particle size is controlled at 120 to 180 nm, which not only reduces the processing difficulty but also retains a good antibacterial function.

[0033] Preferably, the surface of the inner base layer for the hot melt adhesive layer to adhere to is a non-penetrating porous structure. The porous structure can be achieved by designing foaming materials, template method, mechanical puncture, etc., which is conducive to the penetration and subsequent solidification of the hot melt adhesive layer, ensuring that the inner base layer and the hot melt adhesive layer are tightly bonded. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the utility model;

[0035] Figure 2 for Figure 1 A magnified image of point A;

[0036] Figure 3 It is a front view of the utility model;

[0037] Figure 4 for Figure 3 AA section view;

[0038] Figure 5 for Figure 4 The enlarged view of point B;

[0039] Figure 6 This is a schematic diagram of the structural decomposition of the utility model (the hot melt adhesive layer and the antibacterial dry powder particles are omitted).

[0040] Marking Description:

[0041] 1. The first PBS grid layer;

[0042] 2. The second PBS grid layer;

[0043] 3. The third PBS grid layer;

[0044] 4. Inner base layer;

[0045] 5. Antibacterial dry powder;

[0046] 6. Hot melt adhesive layer. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0049] like Figures 1 to 6 As shown, an environmentally friendly antibacterial film comprises an inner base layer 4, a hot melt adhesive layer 6 and at least one PBS grid layer in sequence.

[0050] Preferably, the PBS mesh layer is provided with at least two layers, which are stacked and laid in sequence on at least one side of the inner base layer 4; the inner PBS mesh layers are all covered by the hot melt adhesive layer 6, and the outermost PBS mesh layer is divided into the mesh inner layer and the mesh outer layer along the direction parallel to the layer surface.

[0051] The PBS mesh layer is made of polybutylene succinate (PBS), and the hot melt adhesive layer 6 is formed by coating PUR hot melt adhesive, which has relatively good toughness and mechanical properties after curing, and is in line with the product development and design of this embodiment.

[0052] Specifically in this embodiment, the PBS grid layer is provided with three layers, which are respectively provided as a first PBS grid layer 1 , a second PBS grid layer 2 and a third PBS grid layer 3 .

[0053] The thickness between the three layers of the PBS mesh layer gradually increases from the inner base layer 4 along the thickness direction outward, and the tensile strength that each PBS mesh layer can withstand from the inner base layer 4 along the thickness direction outward also gradually increases, and the post-bonding processing step is used for the processing of this embodiment.

[0054] The first PBS mesh layer 1 at the innermost side has a thickness of 30 μm, and the second PBS mesh layer 2 in the middle has a thickness of 40 μm. The first PBS mesh layer 1 and the second PBS mesh layer 2 are covered by the hot melt adhesive layer 6 to enhance the structural performance of this embodiment and facilitate processing.

[0055] The thickness of the third PBS grid layer 3 on the outermost side is 50 μm, and it is divided into the grid inner layer and the grid outer layer along the direction parallel to the plane. The grid inner layer is for the hot melt adhesive layer 6 to adhere, and the grid outer layer protrudes from the outer environment of the hot melt adhesive layer 6. The hot melt adhesive layer 6 in the mesh of the third PBS grid layer 3 adheres to the antibacterial dry powder particles 5.

[0056] It should be noted that the specific functional layer bonding process of this embodiment is:

[0057] 1) Laying the inner base layer 4, the first PBS mesh layer 1 and the second PBS mesh layer 2 in sequence, applying a hot melt adhesive layer 6 to cover the above three material layers, and curing and cooling;

[0058] If only one PBS mesh layer is designed, then step 1) only needs to lay the inner base layer 4; if the third PBS mesh layer 3 is laid at the same time in step 1), it is difficult to control its "semi-sunken" in the hot melt adhesive layer 6, and the defective rate is high.

[0059] In this embodiment, the surface of the inner base layer 4 for the hot melt adhesive layer 6 to adhere to is a non-penetrating porous structure. The porous structure can be achieved by designing foaming materials, template method, mechanical puncture, etc., which is conducive to the penetration and subsequent solidification of the hot melt adhesive layer 6, thereby ensuring that the inner base layer 4 and the hot melt adhesive layer 6 are tightly bonded.

[0060] 2) The surface of the cooled and solidified hot melt adhesive layer 6 is heated and melted again, and the third PBS mesh layer 3 is laid, solidified and cooled again, and the mesh inner layer of the third PBS mesh layer 3 is adhered by the hot melt adhesive layer 6, and the mesh outer layer protrudes from the outer environment of the hot melt adhesive layer 6.

[0061] 3) The surface of the cooled and solidified hot melt adhesive layer 6 is heated to the lowest melting point, the hot melt adhesive layer 6 in the mesh of the third PBS grid layer 3 is slightly melted, the antibacterial dry powder particles 5 are sprayed, and then immediately cooled and solidified, so that the hot melt adhesive layer 6 in the mesh of the PBS grid layer is adhered with the antibacterial dry powder particles 5, part of the outer surface of the antibacterial dry powder particles 5 is bonded by the hot melt adhesive layer 6, and the other part of the outer surface is exposed to the outer environment of the hot melt adhesive layer 6, and the antibacterial dry powder particles 5 do not protrude from the outer side of the grid outer layer.

[0062] 4) Use dust sweeping equipment to lightly treat the membrane surface to remove excess antibacterial dry powder particles 5.

[0063] From the above process description, it can be seen that: since the present embodiment adopts the method of spraying antibacterial dry powder particles 5 on the surface of the film layer to form an antibacterial surface, this method allows the present invention to expose a large amount of antibacterial substances on the surface of the film, effectively ensuring the antibacterial effect of the present embodiment; at the same time, the antibacterial dry powder particles 5 are designed to be sunken in the mesh of the PBS grid layer, so that when friction occurs in the present embodiment, the PBS grid layer is directly contacted, thereby minimizing the wear or removal of the antibacterial dry powder particles 5 due to friction during post-processing, transportation, and use of the finished product, thereby extending the service life of the present embodiment.

[0064] In actual post-processing steps such as bending and folding, the PBS mesh layer on the outside is subjected to greater tensile strength than the structural layer on the inside, that is, the structural layer on the outside requires more flexible stretchability. Therefore, in this embodiment, the mesh width of the single-layer PBS mesh layer is the same, which is convenient for production.

[0065] The mesh width between the layers of the at least two layers (specifically three layers) of the PBS mesh layer gradually expands outward from the inner base layer 4 along the thickness direction. By targetedly designing the mesh width of the PBS mesh layer at different positions, the stretchability of this embodiment gradually increases outward from the inner base layer 4 along the thickness direction.

[0066] In this embodiment, the mesh widths of the first PBS mesh layer 1, the second mesh layer and the third mesh layer are sequentially arranged in a ratio of 0.5-1.5:2-4:4-6, so that the tolerable tensile strength is distributed in a gradient, which is in line with the tensile strength to which this embodiment is subjected during the processing.

[0067] Specifically in this embodiment, the mesh widths of the first PBS grid layer 1, the second grid layer and the third grid layer are 0.1 mm, 0.3 mm and 0.5 mm, mainly to avoid excessive exposure of the antibacterial dry powder particles 5 to further reduce friction, and to consider not having too obvious grid elements in the appearance of the membrane to avoid limiting the style design of downstream products.

[0068] Specifically, the PBS grid layer is a diamond grid structure, which can better cooperate with and withstand stretching, bending, etc.

[0069] More specifically, the two symmetry axes of the diamond meshes of the PBS grid layer having a diamond grid structure are respectively parallel to the transverse side and the longitudinal side of the inner base layer 4, which conforms to the stretching direction of most post-processing steps for this embodiment.

[0070] In this embodiment, the antibacterial dry powder particles 5 are titanium dioxide silver-loaded particles with a particle size distribution of 120 to 180 nm. Nano-titanium dioxide silver-loaded particles have a better antibacterial effect. At the same time, the particle size is controlled at 120 to 180 nm, with good fluidity, which not only reduces the processing difficulty but also retains a good antibacterial function.

[0071] According to the disclosure and teaching of the above specification, the technicians in the field of the utility model can also change and modify the above implementation mode. Therefore, the utility model is not limited to the specific implementation modes disclosed and described above, and some modifications and changes to the utility model should also fall within the protection scope of the claims of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of explanation and do not constitute any limitation to the utility model.

Claims

1. An environmentally friendly antibacterial film, characterized in that: It includes an inner base layer, a hot melt adhesive layer and at least one PBS mesh layer in sequence. The PBS grid layer is divided into a grid inner layer and a grid outer layer along a direction parallel to the plane. The mesh inner layer is adhered to by the hot melt adhesive layer, and then directly or indirectly adhered to at least one side of the inner base layer through the hot melt adhesive layer. The mesh outer layer protrudes from the outer environment of the hot melt adhesive layer. The hot melt adhesive layer in the mesh of the PBS grid layer is adhered with antibacterial dry powder particles, part of the outer surface of the antibacterial dry powder particles is adhered by the hot melt adhesive layer, and another part of the outer surface is exposed to the outer environment of the hot melt adhesive layer, and the antibacterial dry powder particles do not protrude from the outside of the grid outer layer.

2. The environmentally friendly antibacterial film according to claim 1, characterized in that: The PBS grid layer is provided with at least two layers, which are sequentially stacked and laid on at least one side of the inner base layer; The PBS grid layers on the inner side are all covered by the hot melt adhesive layer; The PBS grid layer at the outermost side is divided into the grid inner layer and the grid outer layer along the direction parallel to the plane. The grid inner layer is for the hot melt adhesive layer to adhere, and the grid outer layer protrudes from the outer environment of the hot melt adhesive layer. The hot melt adhesive layer in the mesh of the PBS grid layer at the outermost side adheres the antibacterial dry powder particles.

3. The environmentally friendly antibacterial film according to claim 2, characterized in that: The mesh width of the single-layer PBS mesh layer is the same, and the mesh width between the layers of the at least two-layer PBS mesh layers gradually increases from the inner base layer to the outside along the thickness direction; The thickness of the at least two PBS grid layers increases gradually from the inner base layer toward the outside along the thickness direction.

4. The environmentally friendly antibacterial film according to claim 3, characterized in that: The PBS grid layer is provided with three layers, which are respectively provided as a first PBS grid layer, a second PBS grid layer and a third PBS grid layer; The first PBS mesh layer and the second PBS mesh layer on the inner side are covered by the hot melt adhesive layer; The third PBS grid layer at the outermost side is divided into the grid inner layer and the grid outer layer along the direction parallel to the plane. The grid inner layer is for the hot melt adhesive layer to adhere, and the grid outer layer protrudes from the outer environment of the hot melt adhesive layer. The hot melt adhesive layer in the mesh of the third PBS grid layer adheres the antibacterial dry powder particles.

5. The environmentally friendly antibacterial film according to claim 4, characterized in that: The mesh widths of the first PBS mesh layer, the second mesh layer and the third mesh layer are sequentially arranged in a ratio of 0.5-1.5:2-4:4-6.

6. The environmentally friendly antibacterial film according to claim 5, characterized in that: The mesh widths of the first PBS mesh layer, the second mesh layer and the third mesh layer are 0.1 mm, 0.3 mm and 0.5 mm.

7. The environmentally friendly antibacterial film according to any one of claims 1 to 6, characterized in that: The PBS grid layer is a diamond grid structure.

8. The environmentally friendly antibacterial film according to claim 7, characterized in that: The two symmetry axes of the rhombus meshes of the PBS grid layer having a rhombus grid structure are respectively parallel to the transverse side edges and the longitudinal side edges of the inner base layer.

9. The environmentally friendly antibacterial film according to any one of claims 1 to 6, characterized in that: The antibacterial dry powder particles are titanium dioxide silver-loaded particles with a particle size of 120 to 180 nm.

10. The environmentally friendly antibacterial film according to any one of claims 1 to 6, characterized in that: The surface of the inner base layer for the hot melt adhesive layer to adhere to is a non-penetrating porous structure.

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