Nano-modified spectacle wiping sheet packaging material and application thereof

Abstract

The invention discloses a nano-modified spectacle wiping sheet packaging material and application thereof, and belongs to the crossing field of an environment-friendly packaging material technology and a nano-composite material. The composite material is formed by a multi-layer composite structure. The preparation method comprises the following steps: melting polylactic acid in a twin-screw extruder, then carrying out injection molding to form a polylactic acid film, mixing silane coupling agent modified nano-silica with a sodium polyacrylate dispersant, and uniformly coating the surface of the polylactic acid film with the mixture through an electrostatic spraying or roller coating process to prepare a modified nano-silica coated polylactic acid film; and finally, bonding a nanofiber membrane with the polylactic acid thin film coated with the modified nano silicon dioxide. The structure realizes high barrier property, excellent mechanical property and high light transmittance. By optimizing the material ratio and process parameters, the damp-heat stability and printing adhesive force are remarkably improved, the defects of traditional paper-aluminum-plastic packaging in the aspects of resource recycling, low-carbon manufacturing and food safety are effectively overcome, and the method is suitable for the single independently-packaged glasses wiping sheet.

Description

Technical Field

[0001] The present invention belongs to the cross - field of environmental protection packaging materials technology and nanocomposite materials, and particularly relates to a preparation process of a multi - layer composite packaging material based on a single environmental protection material, which is applicable to the degradable packaging material for spectacle cleaning wipes. Background Art

[0002] In recent years, with the rapid development of the spectacle cleaning wipe market, higher requirements have been put forward for the performance of packaging materials. Currently, the packaging structures widely used in the market are mainly composites of paper, aluminum, and plastic. The main advantage of this multi - layer heterogeneous composite structure lies in its excellent barrier properties, which can not only effectively prevent moisture and oxygen, but also have good mechanical strength, and can protect the internal products from the external environment during transportation and storage. Therefore, this packaging technology has certain market competitiveness and technical advantages in meeting the product protection requirements.

[0003] However, with the continuous enhancement of global environmental awareness and the deep - rooted concepts of low - carbon economy and sustainable development, this traditional composite packaging technology has exposed a series of defects that need to be solved urgently. First of all, there are significant differences in the physical properties of the three different materials of paper, aluminum, and plastic, making it difficult to achieve efficient separation during the recycling process, and the separation cost is high. As a result, the recovery rate of this type of composite packaging material is less than 15% globally. The low recovery rate not only wastes a large amount of resources but also increases the environmental burden. Secondly, although the aluminum layer used in the packaging has excellent barrier properties, its mining and processing processes consume extremely high energy. According to statistics, the carbon emissions generated per ton of aluminum production can reach 12 tons, which is contrary to the current global goal of promoting low - carbon economy and reducing greenhouse gas emissions. In addition, the plastic layer in the packaging usually uses non - degradable materials such as polyethylene and polypropylene. These materials are difficult to decompose after use and exist in the environment for a long time, further exacerbating the problem of white pollution; especially in emerging markets, the plastic consumption has exceeded 9 million tons / year, and the resulting environmental pollution problem is particularly prominent.

[0004] Another problem that cannot be ignored is that traditional multi - layer composite processes usually rely on chemical adhesives such as polyurethane. These adhesives often have problems with residual solvents during the preparation process, and there is a risk of the residual solvents migrating to the cleaning wipes, which may pose a potential safety hazard to the use of spectacle cleaning wipes. Especially when it comes to products that come into direct contact with human skin, the potential food safety risks are even more worthy of attention.

[0005] In this context, it is particularly urgent to develop a new packaging material that can meet the requirements of barrier properties and mechanical strength for glasses cleaning wipes packaging, and also has significant advantages in terms of environmental protection and resource recycling. The introduction of nano-modification technology provides an effective way to improve material properties. Through nano-modification of a single environmentally friendly substrate, it is possible to achieve a barrier effect similar to or even better than that of traditional paper / aluminum / plastic composite structures without introducing multiple substances for compounding, while improving the mechanical strength and durability of the material. Due to their small particle size and large specific surface area, nano-materials can significantly enhance the anti-permeability and anti-aging properties of the substrate in material modification, which provides technical support for the development of new packaging materials for glasses cleaning wipes.

[0006] From a process perspective, through nano-modification preparation technology, the use of multi-layer structures and chemical adhesives necessary in traditional composite processes can be avoided, fundamentally eliminating potential food safety hazards caused by solvent residues. At the same time, the production process of packaging materials is simplified, and energy consumption and resource consumption during production are reduced. Compared with traditional composite structures, the packaging materials made of a single substrate after nano-modification are not only easier to recycle, but also have a lower environmental load throughout their life cycle, contributing to the circular utilization of resources and the fundamental improvement of environmental pollution.

[0007] In addition, considering the increasingly strict requirements for low-carbon environmental protection globally, developing a new packaging material with high barrier properties, good mechanical properties, easy recyclability and environmental friendliness not only conforms to the green development trend of the international market, but also enables one to gain the upper hand in the fierce market competition. Through in-depth analysis of the defects of traditional paper / aluminum / plastic composite materials and combined with the latest progress of nano-modification technology, this patent aims to provide a packaging material for glasses cleaning wipes that takes into account both environmental protection and high-performance requirements, and its preparation method. This method does not require the use of potentially environmentally harmful chemical adhesives during production, and at the same time avoids the drawback of difficult recycling of multi-layer heterogeneous composite materials.

[0008] In summary, although the commonly used packaging materials for glasses cleaning wipes in the current market have certain advantages in terms of moisture resistance, oxygen barrier and mechanical strength, they have obvious deficiencies in aspects such as resource recycling, low-carbon manufacturing, environmental pollution and food safety. The application of nano-modification technology provides an innovative idea to solve the above problems. The core lies in the functional modification of a single environmentally friendly substrate to achieve the preparation of high-performance packaging materials, so as to meet the urgent needs of modern packaging technology in terms of environmental protection and sustainable development. The present invention provides a nano-modified packaging material for glasses cleaning wipes and its application, which has important innovative significance and application prospects technically, and provides a new idea and method to solve the key problems in the prior art. Summary of the Invention

[0009] A nano-modified eyeglass wipe packaging material, comprising the following raw materials in parts by weight: Polylactic acid: 9-36 parts, Surface modified nano-silicon dioxide: 9-12 parts, Sodium polyacrylate dispersant: 9-36 parts, Plasma treated nanofiber membrane: 1-3 parts; The preparation method of surface modified nano-silica is as follows: the nano-silica is modified with silane coupling agent KH550 or KH570, ultrasonically dispersed in anhydrous ethanol for 30-60 minutes, the coupling agent addition amount is 1-5% of the mass of the nanoparticles, and the reaction temperature is 50-70°C; the preparation method of the plasma-treated nanofiber membrane is as follows: it is prepared by electrospinning, the spinning solution contains 5-10 wt% polylactic acid solution, the spinning voltage is 15-25 kV, the receiving distance is 10-20 cm, the fiber diameter is 100-500 nm, the fiber membrane is placed in a chamber, ultrasonically cleaned with ethanol for 5-10 minutes and dried; modified with argon / nitrogen mixed gas, the volume ratio is 3:1, the gas pressure is 20-30 kPa, the power is 80-100 W, and the time is 1-15 minutes; post-treatment is rinsed with ethanol / water for 3-5 times, vacuum dried at 40°C for 2 hours, and then sealed and stored.

[0010] A nano-modified eyeglass wipe packaging material, comprising the following raw materials in parts by weight: Polylactic acid: 15-30 parts, Surface modified nano-silicon dioxide: 9-12 parts, Sodium polyacrylate dispersant: 18-36 parts, Plasma treated nanofiber membrane: 1-3 parts; The preparation method of surface modified nano-silica is as follows: the nano-silica is modified with silane coupling agent KH550, ultrasonically dispersed in anhydrous ethanol for 35-45 minutes, the coupling agent addition amount is 2-5% of the mass of the nanoparticles, and the reaction temperature is 55-65°C; the preparation method of the plasma-treated nanofiber membrane is as follows: it is prepared by electrospinning, the spinning solution contains 6-9wt% polylactic acid solution, the spinning voltage is 20-25 kV, the receiving distance is 15-20 cm, the fiber diameter is 400-500 nm, the fiber membrane is placed in a chamber, ultrasonically cleaned with ethanol for 7-9 minutes and dried; modified with argon / nitrogen mixed gas, the volume ratio is 3:1, the gas pressure is 25-30 kPa, the power is 90-100 W, and the time is 10-15 minutes; post-treatment is rinsed with ethanol / water for 4-5 times, vacuum dried at 40°C for 2 hours, and then sealed and stored.

[0011] A nano-modified eyeglass wipe packaging material, comprising the following raw materials in parts by weight: Polylactic acid: 18 parts, Surface-modified nano-silica: 12 parts, Sodium polyacrylate dispersant: 24 parts, Plasma-treated nanofiber membrane: 2 parts; The preparation method of the surface-modified nano-silica is as follows: The nano-silica is modified with the silane coupling agent KH550 and ultrasonically dispersed in absolute ethanol for 40 minutes. The addition amount of the coupling agent is 3% of the mass of the nanoparticles, and the reaction temperature is 60 °C. The preparation method of the plasma-treated nanofiber membrane is as follows: Prepared by the electrospinning method. The spinning solution contains an 8 wt% polylactic acid solution, the spinning voltage is 20 kV, the receiving distance is 15 cm, the fiber diameter is 300 nm. The fiber membrane is placed in a chamber, ultrasonically cleaned with ethanol for 8 minutes and dried; Modified with a mixed gas of argon / nitrogen with a volume ratio of 3:1, the gas pressure is 25 kPa, the power is 90 W, and the time is 8 minutes; Post-treatment is to rinse 4 times with ethanol / water, vacuum dry at 40 °C for 2 hours and then store in a sealed manner.

[0012] A nano-modified packaging material for spectacle cleaning wipes, preferably: The CAS number of the polylactic acid is 26100-51-6, Mw 60000, purchased from Shanghai Bide Pharmaceutical Technology Co., Ltd.; The CAS number of the nano-silica is 7631-86-9, Mw 60.08, the particle size is 10-50 nm, purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.; The CAS number of the sodium polyacrylate dispersant is 9003-04-7, Mw 10000–100000, purchased from Shanghai Bide Pharmaceutical Technology Co., Ltd.

[0013] A nano-modified packaging material for spectacle cleaning wipes, the preparation method of the packaging material for spectacle cleaning wipes includes the following steps: (1) Melting polylactic acid in a twin-screw extruder and then injection molding it into a polylactic acid film; (2) Mixing the nano-silica modified with the silane coupling agent KH550 or KH570 and the sodium polyacrylate dispersant, and uniformly coating the surface of the polylactic acid film by an electrostatic spraying or roll coating process to obtain a polylactic acid film coated with modified nano-silica; (3) Activating the plasma-treated nanofiber membrane under argon protection, and bonding the nanofiber membrane with the polylactic acid film coated with modified nano-silica by a hot pressing process.

[0014] A nano-modified packaging material for spectacle cleaning wipes, preferably: The parameters for melting polylactic acid in the twin-screw extruder in step (1): Temperature 160-180 °C, rotation speed 80-120 rpm.

[0015] A nano-modified packaging material for spectacle wiping lenses. Preferably: The parameters of the hot pressing process in step (3): Power 50 - 100 W, time 30 - 90 s, pressure 5 - 10 MPa, at a temperature of 80 - 100 °C.

[0016] A nano-modified packaging material for spectacle wiping lenses, with a total material thickness of 0.1 - 0.3 mm, tensile strength ≥ 35 MPa, and elongation at break ≥ 20%.

[0017] The application of a nano-modified packaging material for spectacle wiping lenses in the packaging of spectacle wiping lenses. Description of the Drawings

[0018] Figure 1 It is a polylactic acid film coated with modified nano-silica prepared in Example 1.

[0019] Figure 2 It is an adhesive film of a plasma-treated nanofiber membrane and the polylactic acid film coated with the modified nano-silica prepared in Example 1. Detailed Description of the Invention Example 1

[0020] A nano-modified packaging material for spectacle wiping lenses, in parts by weight, includes the following raw materials: polylactic acid: 36 parts, Surface-modified nano-silica: 12 parts, sodium polyacrylate dispersant: 36 parts, plasma-treated nanofiber membrane: 3 parts.

[0021] The preparation method of the packaging material for spectacle wiping lenses includes the following steps: (1) Melting polylactic acid in a twin-screw extruder and then injection molding it into a polylactic acid film at 180 °C and a rotation speed of 120 rpm.

[0022] (2) First, ultrasonic dispersing nano-silica and silane coupling agent KH570 in absolute ethanol for 60 minutes at a reaction temperature of 70 °C to obtain nano-silica modified by silane coupling agent KH570. Mixing the modified nano-silica with sodium polyacrylate dispersant and uniformly coating it on the surface of the polylactic acid film through a roll coating process to obtain a polylactic acid film coated with modified nano-silica ( Figure 1 ) (3) First, a nanofiber membrane is prepared from a spinning solution containing 5 wt% polylactic acid solution by electrospinning. Among them, the spinning voltage is 15 kV, the receiving distance is 10 cm, and the fiber diameter is 100 nm. The fiber membrane is placed in a chamber, ultrasonically cleaned with ethanol for 5 minutes and dried. It is modified with a mixed gas of argon / nitrogen with a volume ratio of 3:1, a gas pressure of 20 kPa, a power of 80 W, and a time of 1 minute. The post-treatment is to rinse 3 times with ethanol / water, vacuum dry at 40 °C for 2 hours and then store it sealed. Under argon protection, the plasma-treated nanofiber membrane is activated with a power of 50 W and a time of 30 s, combined with a hot pressing process pressure of 5 MPa, and the plasma-treated nanofiber membrane is bonded to the polylactic acid film coated with modified nano-silica at a temperature of 80 °C ( Figure 2 ).

[0023] After a series of the above process treatments, the obtained composite packaging material reaches 38 MPa in tensile strength, 22% in elongation at break, while its light transmittance is 88%, and the water vapor transmission rate is controlled at 4.8 g / m²·day. In the 180-day biodegradation test, the degradation rate of this material reaches 93%, and in the 40 °C humid and hot environment, the performance retention rate of the material is as high as 96%, fully reflecting the excellent comprehensive performance of the material. Example 2

[0024] A preparation method of a nano-modified spectacle lens wiping packaging material, in parts by weight, includes the following raw materials: polylactic acid: 18 parts, surface-modified nano-silica: 12 parts, sodium polyacrylate dispersant: 24 parts, plasma-treated nanofiber membrane: 2 parts.

[0025] The preparation method of the spectacle lens wiping packaging material includes the following steps (1) The polylactic acid is melted in a twin-screw extruder and then injection-molded into a polylactic acid film at 160 °C and a rotation speed of 80 rpm.

[0026] (2) First, the nano-silica and the silane coupling agent KH550 are ultrasonically dispersed in anhydrous ethanol for 30 - 60 minutes at a reaction temperature of 70 °C to obtain nano-silica modified with the silane coupling agent KH550. The modified nano-silica is mixed with the sodium polyacrylate dispersant and uniformly coated on the surface of the polylactic acid film by electrostatic spraying to obtain a polylactic acid film coated with modified nano-silica; (3) First, a nanofiber membrane is prepared from a spinning solution containing 5 wt% polylactic acid solution by electrospinning. Among them, the spinning voltage is 15 kV, the receiving distance is 10 cm, and the fiber diameter is 100 nm. The fiber membrane is placed in a chamber, ultrasonically cleaned with ethanol for 10 minutes and dried. It is modified with a mixed gas of argon / nitrogen with a volume ratio of 3:1, a gas pressure of 30 kPa, a power of 100 W, and a time of 15 minutes. The post-treatment is to rinse with ethanol / water 5 times, vacuum dry at 40 °C for 2 hours and then seal and store. Under argon protection, the plasma-treated nanofiber membrane is activated with a power of 100 W and a time of 90 s, combined with a hot pressing process pressure of 10 MPa, and the plasma-treated nanofiber membrane is bonded to the polylactic acid film coated with modified nano-silica at a temperature of 100 °C.

[0027] After a series of the above process treatments, the obtained composite packaging material reaches 35 MPa in tensile strength, 20% in elongation at break, and at the same time its light transmittance is 80%, and the water vapor transmission rate is controlled at 4.4 g / m²·day. In the 180-day biodegradation test, the degradation rate of this material reaches 90%, and in the 40 °C damp heat environment, the performance retention rate of the material is as high as 96%, fully reflecting the excellent comprehensive performance of the material. Example 3

[0028] A nano-modified spectacle lens wiping sheet packaging material, in parts by weight, comprises the following raw materials: polylactic acid: 9 parts, Surface-modified nano-silica: 9 parts, sodium polyacrylate dispersant: 9 parts, plasma-treated nanofiber membrane: 1 part.

[0029] This example proposes an ultra-thin design with a total thickness of only 0.1 mm. In the specific design, the polylactic acid film is only 0.05 mm, the polylactic acid film coated with modified nano-silica still maintains a thickness of 5 μm, and the plasma-treated nanofiber membrane increases significantly to 45 μm after being bonded to the polylactic acid film coated with modified nano-silica. After processing, the obtained packaging material reaches 36 MPa in tensile strength and 90% in light transmittance, and is particularly suitable for the packaging of ultra-thin wiping sheets with extremely strict requirements on thickness, such as contact lens packaging, etc. This design makes full use of the application advantages of nanotechnology in thin film materials to ensure good mechanical strength and barrier properties under the ultra-thin design. Example 4

[0030] In this embodiment, to further improve the light transmittance of the packaging material while taking into account the barrier effect, the process of the plasma-treated nanofiber membrane was optimized. Specifically, the electrospinning method was used to prepare the nanofiber membrane. The concentration of the spinning solution was set at 8 wt%, and the receiving distance was extended to 20 cm to achieve a finer fiber distribution. Through process optimization, the fiber diameter was controlled at about 100 nm, the porosity was increased to 50%, and the light transmittance reached 92%. Tests showed that for the barrier layer after this treatment, the oxygen transmission rate was only 8 cm³ / m²·day, while the light transmittance of the overall composite material was 91%, showing a more ideal high light transmittance and barrier effect compared to the traditional process, which is suitable for packaging applications with high requirements for optical transparency. Example 5

[0031] This embodiment adopted a low-temperature composite process. During the composite process of the plasma-treated nanofiber membrane and the polylactic acid film coated with modified nano-silica, the hot pressing temperature was controlled at 80 °C, and the pressure was appropriately increased to 10 MPa. This low-temperature composite process not only effectively reduced the energy consumption during the material production process but also made the peel strength of the composite material reach 2.3 N / mm and ensured that the light transmittance was maintained at 87%. This process is particularly suitable for temperature-sensitive substrates and functional layer materials, helping to achieve a low-energy and low-cost production process while ensuring the bonding strength. Example 6

[0032] In this embodiment, for special application scenarios, such as outdoor use or packaging products with high requirements for ultraviolet protection, large-sized modified nano-silica with a particle size of 50 nm and a specific surface area of 310 m² / g was selected. By adjusting the composite formula of the polylactic acid film coated with modified nano-silica, this layer not only effectively blocked moisture and oxygen but also had excellent ultraviolet shielding effects. The test results showed that the ultraviolet shielding rate was as high as 99%. This design not only provided protection for the outdoor wipe packaging but also played a positive role in preventing ultraviolet aging and related product quality degradation, meeting the requirements for multiple properties of packaging materials in special environments. Example 7

[0033] The materials synthesized in Examples 1-6 have been successfully applied to the individual packaging of anti-fog glasses wipes. The packaging structure has a single-piece size of 8×8 cm, and the wipe can be directly used to wipe the lens after opening the package. After 6 months of soil burial experiment, the mass loss rate of the packaging reached 85%, meeting the trend of green packaging.

[0034] Comparative Example 1 Traditional paper-aluminum-plastic composite films are composed of paper, aluminum foil, and polyethylene. The paper layer has a thickness of approximately 40 μm, the aluminum foil is about 9 μm, and the polyethylene layer is around 50 μm. Although this structure exhibits good barrier properties, due to the difficulty in achieving efficient separation between different materials, its recycling cost is high. At the same time, its tensile strength is only 28 MPa, and the overall structure is non-degradable with a light transmittance of 0%, unable to meet the requirements of modern packaging for environmental protection, degradability, and high light transmittance.

[0035] Comparative Example 2 In the comparative experiment, unmodified nano-silica by silane coupling agent was used as a component of the functional layer. Due to its tendency to agglomerate, the coating thickness distribution was uneven, and the actual thickness range was unstable between 5 - 30 μm. Moreover, the overall light transmittance was only 72%. In the mechanical property test after lamination, its tensile strength was only 28 MPa, showing obvious performance disadvantages, which proved the importance of modification treatment for the uniform dispersion of nano-SiO2 and the improvement of the composite layer performance.

[0036] Comparative Example 3 Another comparative example used traditional chemical adhesives (such as polyurethane) for lamination of each layer. It was easy to leave residual solvents during the lamination of the barrier layer. The test results showed that the peel strength of the packaging material prepared by this method was only 1.8 N / mm, and the residual solvent amount was as high as 120 ppm. At the same time, the biodegradation rate was only 65%. This low degradation rate and potential food safety hazards fully illustrate the deficiencies of traditional adhesive processes in the field of environmental protection and high-performance packaging.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the implementation process and characteristics of the present invention, rather than limiting the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be modified or equivalently replaced, and any modification or partial replacement without departing from the spirit and scope of the present invention shall be covered by the protection scope of the present invention.

Claims

1. A nano-modified eyeglass wipe packaging material, characterized in that: In parts by weight, the following raw materials are included: Polylactic acid: 9-36 parts, Surface modified nano-silicon dioxide: 9-12 parts, Sodium polyacrylate dispersant: 9-36 parts, Plasma treated nanofiber membrane: 1-3 parts; The preparation method of surface modified nano-silica is as follows: the nano-silica is modified with silane coupling agent KH550 or KH570, ultrasonically dispersed in anhydrous ethanol for 30-60 minutes, the coupling agent addition amount is 1-5% of the mass of the nanoparticles, and the reaction temperature is 50-70°C; the preparation method of the plasma-treated nanofiber membrane is as follows: it is prepared by electrospinning, the spinning solution contains 5-10 wt% polylactic acid solution, the spinning voltage is 15-25 kV, the receiving distance is 10-20 cm, the fiber diameter is 100-500 nm, the fiber membrane is placed in a chamber, ultrasonically cleaned with ethanol for 5-10 minutes and dried; modified with argon / nitrogen mixed gas, the volume ratio is 3:1, the gas pressure is 20-30 kPa, the power is 80-100 W, and the time is 1-15 minutes; post-treatment is rinsed with ethanol / water for 3-5 times, vacuum dried at 40°C for 2 hours, and then sealed and stored.

2. The nano-modified eyeglass wipe packaging material according to claim 1, characterized in that: In parts by weight, the following raw materials are included: Polylactic acid: 15-30 parts, Surface modified nano-silicon dioxide: 9-12 parts, Sodium polyacrylate dispersant: 18-36 parts, Plasma treated nanofiber membrane: 1-3 parts; The preparation method of surface modified nano-silica is as follows: the nano-silica is modified with silane coupling agent KH550, ultrasonically dispersed in anhydrous ethanol for 35-45 minutes, the coupling agent addition amount is 2-5% of the mass of the nanoparticles, and the reaction temperature is 55-65°C; the preparation method of the plasma-treated nanofiber membrane is as follows: it is prepared by electrospinning, the spinning solution contains 6-9 wt% polylactic acid solution, the spinning voltage is 20-25 kV, the receiving distance is 15-20 cm, the fiber diameter is 400-500 nm, the fiber membrane is placed in a chamber, ultrasonically cleaned with ethanol for 7-9 minutes and dried; modified with argon / nitrogen mixed gas, the volume ratio is 3:1, the gas pressure is 25-30 kPa, the power is 90-100 W, and the time is 10-15 minutes; post-treatment is rinsed with ethanol / water for 4-5 times, vacuum dried at 40°C for 2 hours, and then sealed and stored.

3. The nano-modified eyeglass wipe packaging material according to claim 2, characterized in that: In parts by weight, the following raw materials are included: Polylactic acid: 18 parts, Surface modified nano-silicon dioxide: 12 parts, Sodium polyacrylate dispersant: 24 parts, Plasma treated nanofiber membrane: 2 parts; The preparation method of surface modified nano-silica is as follows: nano-silica is modified with silane coupling agent KH550 and ultrasonically dispersed in anhydrous ethanol for 40 minutes. The coupling agent addition amount is 3% of the mass of the nanoparticles, and the reaction temperature is 60°C. The preparation method of plasma-treated nanofiber membrane is as follows: it is prepared by electrospinning, the spinning solution contains 8 wt% polylactic acid solution, the spinning voltage is 20 kV, the receiving distance is 15 cm, the fiber diameter is 300 nm, the fiber membrane is placed in a chamber, and ethanol is ultrasonically cleaned for 8 minutes and dried; it is modified with argon / nitrogen mixed gas with a volume ratio of 3:1, a gas pressure of 25 kPa, a power of 90 W, and a time of 8 minutes; the post-treatment is rinsed with ethanol / water 4 times, and then vacuum dried at 40°C for 2 hours and sealed for storage.

4. The nano-modified eyeglass wipe packaging material according to claim 1, characterized in that: The CAS number of polylactic acid is 26100-51-6, Mw 60000, purchased from Shanghai Bid Pharmaceutical Technology Co., Ltd.; The CAS number of nano-silicon dioxide is 7631-86-9, Mw is 60.08, and the particle size is 10-50 nm. It was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd. The sodium polyacrylate dispersant has a CAS number of 9003-04-7 and a Mw of 10000–100000 and was purchased from Shanghai Bid Pharmaceutical Technology Co., Ltd.

5. The nano-modified eyeglass wipe packaging material according to claim 1, wherein the preparation method of the eyeglass wipe packaging material comprises the following steps: (1) Melting polylactic acid in a twin-screw extruder and then injection molding it into a polylactic acid film; (2) mixing nano-silica modified by silane coupling agent KH550 or KH570 with sodium polyacrylate dispersant, and uniformly coating the nano-silica on the surface of the polylactic acid film by electrostatic spraying or roller coating to obtain a polylactic acid film coated with modified nano-silica; (3) activating the plasma-treated nanofiber membrane under argon protection, and bonding the nanofiber membrane to the modified nano-silicon dioxide-coated polylactic acid film by combining a hot pressing process.

6. The nano-modified eyeglass wipe packaging material according to claim 5, characterized in that: Parameters for melting polylactic acid in a twin-screw extruder in step (1): Temperature 160-180℃, speed 80-120 rpm.

7. The nano-modified eyeglass wipe packaging material according to claim 5, characterized in that: Parameters of the hot pressing process in step (3): Power 50-100 W, time 30-90 s, pressure 5-10 MPa, temperature 80-100 °C.

8. The nano-modified eyeglass wipe packaging material according to claim 1, characterized in that: The total thickness of the material is 0.1-0.3 mm, the tensile strength is ≥35 MPa, and the elongation at break is ≥20%.

9. Use of the nano-modified eyeglass wipe packaging material according to claim 1 in eye wipe packaging.

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