Biaxially oriented nano nylon film

Abstract

The utility model provides a two-way stretching nano nylon film. The two-way stretching nano nylon film comprises an anti-adhesion layer, a blocking layer, a supporting inner core, a buffering inner core, an energy absorption layer, a static electricity consumption layer and a functional layer, due to the nano concave-convex array of the anti-adhesion layer, the actual contact area between the films is reduced, and adhesion of the films is prevented; the barrier layer is perpendicular to the nanofiber directionally arranged on the film surface, so that the diffusion path of gas molecules is increased, and the barrier property of the film is remarkably improved; the hexagonal honeycomb structure of the supporting inner core and the linear gradient distribution of molecular chains of the buffering inner core enhance the strength and buffering performance of the thin film; a micro-crack network of the static electricity consumption layer enables charges to be rapidly conducted and dissipated, and static electricity accumulation is avoided; the grating structure of the functional layer endows the film with a specific optical function, so that the requirements of the market on diversified functions of the film are met; through the design, the performance and the function of the two-way stretching nano nylon film are remarkably improved, and the two-way stretching nano nylon film has a wider application prospect.

Description

TECHNICAL FIELD

[0001] The utility model relates to nylon film field especially relates to a biaxial stretching nanometer nylon film. BACKGROUND

[0002] Nylon film has been widely used in packaging, electronics, agriculture and many other fields due to its excellent physical and chemical properties. It has good mechanical strength, wear resistance, flexibility and certain barrier properties to oxygen and water vapor; traditional nylon film preparation usually adopts biaxial stretching process, which can make nylon molecular chains arrange in order in the transverse and longitudinal directions, thereby significantly improving the mechanical properties of the film;

[0003] In the packaging field, nylon film is often used for packaging of food, medicine, cosmetics and other products; its high strength and flexibility can protect the products from damage during transportation and storage; certain barrier properties can prevent oxygen, water vapor and other substances from entering the packaging, thereby prolonging the shelf life of the products; in the electronics field, nylon film can be used as an insulating material or packaging material for electronic components, and its good electrical insulation and mechanical properties can meet the requirements of electronic equipment for materials; in the agricultural field, nylon film can be used for greenhouse covering, mulching and other purposes to provide a suitable growing environment for crops;

[0004] However, the existing nylon film has few levels and single function, which makes it difficult to be applied in various application environments. UTILITY MODEL CONTENT

[0005] In order to solve the problem of few levels and single function in the prior art, the utility model provides a biaxial stretching nanometer nylon film;

[0006] The biaxial stretching nanometer nylon film provided by the utility model adopts the following technical scheme:

[0007] A biaxial stretching nanometer nylon film, comprising a film main body, the film main body comprises a seven-layer asymmetric structure formed by co-extrusion and stretching from outside to inside, the structure comprises an anti-adhesion layer, a barrier layer, a support inner core, a buffer inner core, an energy absorption layer, an electrostatic consumption layer and a functional layer from outside to inside;

[0008] Further, the thickness ratio of the anti-adhesion layer is 1%-3% of the total thickness, and the surface of the anti-adhesion layer is provided with a nano concave-convex array formed by transverse and longitudinal stretching, the unit height of the concave-convex array is 200nm-500nm, and the pitch is 1-3um;

[0009] Further, the thickness ratio of the barrier layer is 5%-10% of the total thickness, and the barrier layer comprises nano fibers arranged vertically to the film surface, the diameter of the nano fibers is 20nm-50nm, and the arrangement density is 80-120 roots / um.2 ;

[0010] Further, the thickness ratio of the support inner core is 35%-45% of the total thickness, and the support inner core is internally formed with a plurality of support units in a hexagonal honeycomb structure;

[0011] Further, the thickness ratio of the buffer inner core is 15%-25% of the total thickness, and the molecular chain orientation in the buffer inner core is linearly gradient distributed;

[0012] Further, the thickness ratio of the energy absorption layer is 10%-20% of the total thickness, and the energy absorption layer is internally provided with a micropore array with a pore diameter of 1-3 microns, and the porosity of the array is 8%-12%;

[0013] Further, the thickness ratio of the static electricity consumption layer is 8%-12% of the total thickness, and the surface of the static electricity consumption layer is distributed with a microcrack network with a width of 10-50 nanometers;

[0014] Further, the thickness ratio of the functional layer is 3%-7% of the total thickness, and the functional layer is provided with a grating structure with a period of 200-500 nanometers;

[0015] Further, the total thickness of the film body is 15-50 microns.

[0016] In summary, the beneficial effects of the present application are:

[0017] The unique seven-layer asymmetric structure design effectively solves the problems of traditional nylon film; the nano concave-convex array of the anti-adhesion layer reduces the actual contact area between the films, preventing film adhesion; the nano fibers of the barrier layer vertically arranged on the film surface increase the diffusion path of gas molecules, significantly improving the barrier performance of the film; the hexagonal honeycomb structure of the support inner core and the linear gradient distribution of the molecular chain of the buffer inner core enhance the strength and buffering performance of the film; the microcrack network of the static electricity consumption layer enables the charge to be quickly conducted and dissipated, avoiding the accumulation of static electricity; the grating structure of the functional layer endows the film with specific optical functions, meeting the market demand for diversified functions of the film; through these designs, the bidirectional stretching nano nylon film has significantly improved performance and functions, and has a wider application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0019] As shown in the figure: 1-anti-adhesion layer, 2-barrier layer, 3-support inner core, 4-buffer inner core, 5-energy absorption layer, 6-static electricity consumption layer, 7-functional layer. DETAILED DESCRIPTION

[0020] The following is in conjunction with the appendix Figure 1 The present invention will be further described in detail below:

[0021] This utility model discloses a biaxially oriented nano-nylon film, such as... Figure 1 As shown, a biaxially oriented nano-nylon film includes a film body comprising a seven-layer asymmetric structure formed by co-extrusion stretching from the outside to the inside. The structure, from the outside to the inside, consists of an anti-adhesion layer 1, a barrier layer 2, a support core 3, a buffer core 4, an energy-absorbing layer 5, a static dissipation layer 6, and a functional layer 7. In this embodiment, the seven-layer asymmetric structure is designed based on different functional requirements, with each layer having a unique function. The layers work synergistically to give the film various excellent properties, such as anti-adhesion, barrier, support, buffer, energy absorption, static dissipation, and specific functions, meeting the needs of different application scenarios. The film is produced by co-extrusion stretching, where seven different formulations of nylon materials are melted and plasticized in an extruder. Then, through a specially designed co-extrusion die, the layers are bonded together in a predetermined order and thickness. Following a biaxial stretching process, the film is stretched in both the transverse and longitudinal directions, aligning the molecular chains and thus improving the film's physical properties.

[0022] like Figure 1 As shown, the thickness of the anti-adhesion layer 1 accounts for 1%-3% of the total thickness. The surface of the anti-adhesion layer 1 is formed by stretching in both directions to create a nano-protrusion array. The unit height of this array is 200nm-500nm, and the spacing is 1-3μm. In this embodiment, the nano-protrusion array on the surface of the anti-adhesion layer 1 increases the surface roughness of the film and reduces the actual contact area between the films. When the two films come into contact with each other, air can circulate between them due to the presence of the protrusion array, thereby reducing the adhesion between the films and preventing them from sticking together. During the co-extrusion process, by using additives in the anti-adhesion layer 1 material or by employing special mold surface treatment technology, the anti-adhesion layer 1 forms a nano-protrusion array during the biaxial stretching process.

[0023] Specifically, nanoscale inorganic particles can be added to the material, and during the stretching process, these particles will cause the surface to form an uneven structure; or a mold with a micro-nano structure can be used to replicate the structure on the surface during film forming.

[0024] like Figure 1 As shown, the thickness of the barrier layer 2 accounts for 5%-10% of the total thickness. The barrier layer 2 contains nanofibers oriented perpendicular to the membrane surface. The diameter of these nanofibers is 20nm-50nm, and the packing density is 80-120 fibers / μm. 2In this embodiment, the nanofibers inside the barrier layer 2 are arranged vertically to the film surface, forming a physical barrier; when gas molecules pass through the film, they need to bypass these nanofibers, increasing the diffusion path of the gas molecules, thereby reducing the gas transmission rate and playing a role in blocking gas; when preparing the barrier layer 2 material, first disperse the nanofibers uniformly in the nylon matrix, and then arrange the nanofibers in the stretching direction by stretching process; solution spinning or melt spinning method can be used to prepare nanofibers, then mix with nylon resin, and through extrusion and stretching process, the nanofibers are arranged vertically to the film surface;

[0025] As shown in Figure 1 , the thickness ratio of the support inner core 3 is 35%-45% of the total thickness, and a plurality of support units in hexagonal honeycomb structure are formed inside the support inner core 3; in this embodiment, the support units in hexagonal honeycomb structure inside the support inner core 3 have good mechanical properties; the hexagonal structure is a stable geometric shape, which can uniformly disperse external force and provide high compressive strength and rigidity, so that the film is not easy to deform under external force; in the extrusion process of the support inner core 3 material, micro-foaming technology can be used to add foaming agent in the material, and the foaming agent forms a honeycomb structure during the extrusion process, and then the structure is further stabilized and optimized by bidirectional stretching;

[0026] As shown in Figure 1 , the thickness ratio of the buffer inner core 4 is 15%-25% of the total thickness, and the molecular chain orientation inside the buffer inner core 4 is linearly gradient distributed; when the film is subjected to external force impact, the molecular chains with different orientations can gradually absorb and disperse energy; the change of molecular chain orientation makes the energy transfer and dissipate between different areas, thereby playing a buffering role and reducing the damage of external force to the film and the packaged goods; in the bidirectional stretching process of the buffer inner core 4 material, step-by-step stretching or gradient temperature stretching method can be used to control the orientation of the molecular chain;

[0027] As shown in Figure 1 , the thickness ratio of the energy absorption layer 5 is 10%-20% of the total thickness, and the micro-pore array with a pore size of 1-3 μm is arranged inside the energy absorption layer 5, and the porosity of the array is 8%-12%; in this embodiment, the micro-pore array inside the energy absorption layer 5 has a large specific surface area and porosity; when the film is subjected to external force, the micro-pores will deform and compress, absorbing and dissipating energy; the existence of micro-pores can also increase the flexibility of the material, so that the film can better adapt to the change of external force, further improving the energy absorption effect; supercritical carbon dioxide is used as a foaming agent in the energy absorption layer 5 material, which is dissolved in the material under high pressure, and then evaporated by depressurization to form micro-pores;

[0028] As shown in Figure 1As shown, the thickness of the electrostatic dissipation layer 6 accounts for 8%-12% of the total thickness, and the surface of the electrostatic dissipation layer 6 is distributed with a microcrack network with a width of 10nm-50nm. In this embodiment, the microcrack network on the surface of the electrostatic dissipation layer 6 increases the conductivity of the film surface. When static electricity is generated on the film surface, the charge can be quickly conducted and dissipated through the microcrack network, avoiding the accumulation of static electricity and thus reducing the impact of static electricity on the film and the packaged items. Conductive additives, such as carbon nanotubes and metal powders, are added to the material of the electrostatic dissipation layer 6, and then a microcrack network is formed on the surface of the material through a stretching process. The conductive additives form conductive channels on the surface of the material during the stretching process, and the presence of microcracks further increases the charge conduction path.

[0029] like Figure 1 As shown, the thickness of functional layer 7 accounts for 3%-7% of the total thickness, and functional layer 7 is provided with a grating structure with a period of 200nm-500nm. In this embodiment, the grating structure of functional layer 7 can produce diffraction and interference of light, thereby endowing the thin film with specific optical properties, such as reflection, refraction, and absorption. According to the period and structural design of the grating, different optical effects can be achieved, such as anti-counterfeiting and decoration. The grating structure is fabricated on the surface of functional layer 7 using micro-nano processing technologies such as photolithography and imprinting. Photolithography is a technique that uses photoresist and exposure processes to form a grating pattern on the surface of the thin film. Imprinting is a technique that uses a mold with a grating structure to imprint a grating onto the surface of the thin film.

[0030] like Figure 1 As shown, the total thickness of the film body is 15μm-50μm. In this embodiment, the total thickness of the film body is between 15μm and 50μm, which takes into account both the performance and cost factors of the film. A thinner film can reduce material cost and weight, but may affect the strength and barrier properties of the film. A thicker film can improve the performance of the film, but will increase cost and weight. Choosing this thickness range can achieve a good balance between performance and cost.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. The various components mentioned in this utility model are common technologies in the existing field. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A bidirectional-stretching nano-nylon film comprising a film main body, characterized by, The film body comprises a seven-layer asymmetric structure formed by co-extrusion and stretching from outside to inside, which comprises an anti-adhesion layer (1), a barrier layer (2), a supporting inner core (3), a buffer inner core (4), an energy absorption layer (5), an electrostatic consumption layer (6) and a functional layer (7) from outside to inside.

2. The biaxially-stretched nanonylon film according to claim 1, characterized by, The thickness ratio of the anti-adhesion layer (1) is 1%-3% of the total thickness, and the surface of the anti-adhesion layer (1) is provided with a nano concave-convex array formed by transverse and longitudinal stretching, the unit height of the concave-convex array is 200nm-500nm, and the pitch is 1-3μm.

3. The biaxially-stretched nanonylon film according to claim 1, characterized in that, The thickness of the barrier layer (2) accounts for 5%-10% of the total thickness, and the barrier layer (2) contains nanofibers arranged vertically to the film surface, the diameter of the nanofibers is 20-50 nm, and the arrangement density is 80-120 per μm 2 .

4. The biaxially-stretched nanonylon film according to claim 1, characterized by, The thickness ratio of the supporting inner core (3) is 35%-45% of the total thickness, and a plurality of supporting units in the form of hexagonal honeycomb structure are formed in the supporting inner core (3).

5. The biaxially-stretched nanonylon film according to claim 1, characterized in that, The thickness ratio of the buffer inner core (4) is 15%-25% of the total thickness, and the molecular chain orientation in the buffer inner core (4) is linearly gradient distributed.

6. The biaxially-stretched nanonylon film according to claim 1, characterized in that, The thickness ratio of the energy absorption layer (5) is 10%-20% of the total thickness, and a micropore array with a pore size of 1μm-3μm is arranged in the energy absorption layer (5), and the porosity of the array is 8%-12%.

7. The biaxially-stretched nanonylon film according to claim 1, characterized in that, The thickness ratio of the electrostatic consumption layer (6) is 8%-12% of the total thickness, and the surface of the electrostatic consumption layer (6) is distributed with a micro-crack network with a width of 10nm-50nm.

8. The biaxially-stretched nanonylon film according to claim 1, characterized in that, The thickness ratio of the functional layer (7) is 3%-7% of the total thickness, and the functional layer (7) is provided with a grating structure with a period of 200nm-500nm.

9. The biaxially-stretched nanonylon film according to any one of claims 1 to 8, characterized in that, The total thickness of the film body is 15μm-50μm.

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