Environment-friendly antibacterial moistureproof photovoltaic isolation paper and preparation method thereof

Abstract

The invention relates to the technical field of papermaking, and provides environment-friendly antibacterial and moistureproof photovoltaic isolation paper and a preparation method thereof.The environment-friendly antibacterial and moistureproof photovoltaic isolation paper sequentially comprises an antistatic layer, a paper layer, an antibacterial layer and a protective layer from bottom to top, the preparation method comprises the steps that S100, the paper layer is prepared, specifically, a chemical additive is added into paper pulp and stirred to be uniform, the paper is made, and the paper layer is prepared; a paper layer is obtained; s200, spraying an antistatic layer: spraying an antistatic agent on the bottom surface of the paper layer to obtain the paper layer with the antistatic layer; s300, spraying an antibacterial layer: spraying an antibacterial agent on the other surface, opposite to the bottom surface, of the paper layer to obtain the paper layer with the antistatic layer and the antibacterial layer; and S400, coating of a protective layer: melting the modified PLA particles, and uniformly coating the surface of the antibacterial layer with the molten modified PLA particles to obtain the environment-friendly antibacterial moistureproof photovoltaic isolation paper. Through the synergistic effect of compounding the layers, the performance of the environment-friendly antibacterial moistureproof photovoltaic isolation paper is better.

Description

Technical Field

[0001] The present invention relates to the technical field of homogenization processes, and more particularly, to an environmentally friendly antibacterial and moisture-proof photovoltaic isolation paper and a preparation method thereof. Background Art

[0002] Photovoltaic materials refer to materials that can directly convert solar energy into electrical energy, and they have high requirements for precision. To ensure the performance of photovoltaic materials, it is usually necessary to protect them during production, transportation, and storage. Photovoltaic isolation paper is a protective functional material specifically used for photovoltaic components such as solar cells, photovoltaic glass, silicon wafers, etc. during production, transportation, and storage. It is mainly to avoid mechanical damage to photovoltaic materials during handling and reduce the risk of electrostatic adsorption of dust or damage to precision circuits.

[0003] Currently, in related technologies, antistatic isolation paper is usually used to protect photovoltaic materials. Antistatic isolation paper mainly reduces the accumulation and conduction of static electricity, thereby protecting photovoltaic materials from damage caused by electrostatic discharge (ESD). Antistatic isolation paper usually contains antistatic additives or has a conductive coating, and these characteristics enable it to effectively reduce or dissipate static charges. Electrostatic discharge is a common source of faults in electronic devices, which may cause damage to photovoltaic materials, product failures, and data loss. By using antistatic isolation paper, these risks can be significantly reduced. In addition, antistatic isolation paper can also provide physical isolation, preventing collisions or friction of photovoltaic materials during transportation and storage, reducing the adhesion of dust and pollutants, and protecting the surface of photovoltaic materials from contamination.

[0004] However, during the long-term storage of photovoltaic materials, water vapor will reduce the electrical performance of photovoltaic materials, affecting the power generation efficiency, and bacteria and molds may cause material degradation and even contaminate the surface of photovoltaic components. Antistatic isolation paper cannot effectively eliminate the effects of water vapor, bacteria, molds, etc. on photovoltaic materials. Therefore, there is an urgent need to provide an environmentally friendly antibacterial and moisture-proof photovoltaic isolation paper and a preparation method thereof. Summary of the Invention

[0005] The present invention aims to solve at least one of the above technical problems.

[0006] The present invention provides a preparation method of an environmentally friendly antibacterial and moisture-proof photovoltaic isolation paper. The environmentally friendly antibacterial and moisture-proof photovoltaic isolation paper sequentially includes an antistatic layer, a paper layer, an antibacterial layer, and a protective layer from bottom to top. The preparation method includes:

[0007] S100. Prepare the paper layer: Add a chemical additive to the pulp and stir evenly, then form paper by papermaking to obtain the paper layer;

[0008] S200. Spray the antistatic layer: Spray the antistatic agent on the bottom surface of the paper layer to obtain a paper layer with an antistatic layer;

[0009] S300, Spraying an antibacterial layer: Spraying an antibacterial agent on the side of the paper layer opposite to the bottom surface to obtain a paper layer with an antistatic layer and an antibacterial layer;

[0010] S400, Coating a protective layer: After melting the modified PLA particles, uniformly coating them on the surface of the antibacterial layer to obtain an environmentally friendly antibacterial and moisture-proof photovoltaic isolation paper;

[0011] Among them, the pulp includes virgin wood pulp, bamboo pulp, and recycled pulp.

[0012] In any of the above technical solutions, the mass ratio of virgin wood pulp, bamboo pulp, and recycled pulp is (9 - 11):(7 - 9):(1 - 2).

[0013] In any of the above technical solutions, the antistatic agent includes a mixture of polylactic acid - glycerol ester and nano - graphene oxide; the preparation method of the antistatic agent includes:

[0014] S201, Preparing a polylactic acid - glycerol ester emulsion: Dissolving polylactic acid in ethanol, then slowly dropping in glycerol and polyethylene glycol, and stirring evenly to obtain a polylactic acid - glycerol ester emulsion;

[0015] S202, Preparing a nano - graphene oxide dispersion: Adding nano - graphene oxide particles to deionized water for the first ultrasonic dispersion treatment, and then adding an ultrasonic dispersant to obtain a nano - graphene oxide dispersion;

[0016] S203, Preparing an antistatic agent: Adding the nano - graphene oxide dispersion to the polylactic acid - glycerol ester emulsion, stirring evenly, and then performing a filtration treatment to obtain the antistatic agent;

[0017] Among them, the ultrasonic dispersant includes any one of Tween 80, Span 80, chitosan, or polyvinylpyrrolidone.

[0018] In any of the above technical solutions, in S201, the mass ratio of polylactic acid, glycerol, and polyethylene glycol is (7 - 7.5):(1.5 - 2):1; and / or in S202, the mass ratio of nano - graphene oxide particles, ultrasonic dispersant, and deionized water is (0.01 - 0.03):0.002:1; and / or in S202, the particle size of the nano - graphene oxide particles is 50 - 100 nm; and / or in S203, the mass ratio of the nano - graphene oxide dispersion to the polylactic acid - glycerol ester emulsion is (1 - 1.5):20.

[0019] In any of the above technical solutions, the preparation method of the modified PLA particles includes:

[0020] S410, Pre - dispersion of nano - fillers: Performing a second ultrasonic dispersion treatment on modified nano - silica and carbon black to obtain nano - fillers;

[0021] S420. Blending of PLA matrix and filler: Mix the PLA matrix and the nano-filler, stir evenly, melt and extrude, then cut into pellets to obtain modified PLA pellets.

[0022] In any of the above technical solutions, S410 includes:

[0023] S411. Dissolve the coupling agent in an ethanol aqueous solution, stir, then add nano-silica, and perform third ultrasonic dispersion treatment and first drying treatment in sequence to obtain modified nano-silica;

[0024] S412. Add the carbon black raw material to the mixed acid for acidification treatment to obtain carbon black;

[0025] S413. Add the modified nano-silica and carbon black to ethanol, and perform second ultrasonic dispersion treatment and second drying treatment in sequence to obtain nano-fillers;

[0026] Among them, the mixed acid includes a mixture of sulfuric acid and nitric acid.

[0027] In any of the above technical solutions, in S411, the mass ratio of nano-silica, coupling agent to ethanol aqueous solution is 1:(0.01 - 0.03):(2 - 3); and / or in S411, the frequency of the third ultrasonic dispersion treatment is 40 - 50 kHz, the temperature is 50 - 60 °C, and the time is 30 - 60 min; and / or in S411, the drying treatment time is 1 - 4 h, and the temperature is 60 - 80 °C; and / or in S412, in the mixed acid, the volume ratio of sulfuric acid to nitric acid is (1 - 1.2):3; and / or in S412, the mass-volume ratio of carbon black to mixed acid is 1 g:20 mL.

[0028] In any of the above technical solutions, between S100 and S200, there is also included:

[0029] S110. Perform corona treatment on the paper layer;

[0030] After corona treatment, the dyne value of the paper layer is 46 - 52 dyne.

[0031] In any of the above technical solutions, the thickness of the antistatic layer is 3 - 7 μm; and / or the thickness of the paper layer is 40 - 60 μm; and / or the thickness of the antibacterial layer is 5 - 10 μm; and / or the thickness of the protective layer is 2 - 3 μm.

[0032] To achieve the second object of the present invention, the present invention also provides an environmentally friendly antibacterial and moisture-proof photovoltaic isolation paper, and the environmentally friendly antibacterial and moisture-proof photovoltaic isolation paper is prepared by using the preparation method of any one of the above technical solutions.

[0033] After adopting the technical solution of the present invention, the following technical effects can be achieved:

[0034] 1. The present invention comprises an antistatic layer, a paper layer, an antibacterial layer and a protective layer. By combining the synergistic effect of the layers, the performance of the environmentally friendly antibacterial and moisture-proof photovoltaic isolation paper is improved;

[0035] 2. The paper layer uses a combination of virgin wood pulp, bamboo pulp and recycled pulp, and optimizes the fiber ratio to take into account strength, toughness and degradability, and can reduce costs while also being environmentally friendly. Among them, virgin wood pulp provides fiber strength, giving the paper layer better performance; bamboo fiber in bamboo pulp is a natural antibacterial component that can give the paper layer certain antibacterial properties; recycled pulp is made from recycled waste paper, which can reduce the use of virgin wood pulp, reduce wood consumption, and achieve resource recycling;

[0036] 3. The antibacterial layer is located between the paper layer and the protective layer to avoid direct wear and tear, so that the antibacterial activity is maintained for more than 12 months. PLA is a degradable bio-based material, which meets the carbon neutrality goal, making the environmentally friendly antibacterial and moisture-proof photovoltaic isolation paper more green and environmentally friendly. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the related art, antistatic isolation paper is usually used to protect photovoltaic materials. Antistatic isolation paper usually contains antistatic additives or has a conductive coating, so that it can effectively reduce or dissipate static electricity, thereby reducing static electricity accumulation and conduction, thereby protecting photovoltaic materials from damage caused by static electricity discharge; however, antistatic isolation paper cannot effectively eliminate the effects of water vapor, bacteria, mold, etc. on photovoltaic materials.

[0039] In view of this, the present invention provides an environmentally friendly antibacterial and moisture-proof photovoltaic isolation paper and a preparation method thereof, by further arranging an antibacterial layer and a protective layer on the surface of a paper layer having an antistatic layer, so that the photovoltaic isolation paper has certain antibacterial and moisture-proof properties.

[0040] Specifically, an embodiment of the present invention provides a method for preparing an environmentally friendly antibacterial and moisture-proof photovoltaic isolation paper, wherein the environmentally friendly antibacterial and moisture-proof photovoltaic isolation paper comprises an antistatic layer, a paper layer, an antibacterial layer and a protective layer from bottom to top, and the preparation method comprises:

[0041] S100, preparing a paper layer: adding chemical additives to the pulp and stirring evenly, forming paper into paper, and obtaining a paper layer;

[0042] S200, spraying an antistatic layer: spraying an antistatic agent on the bottom surface of the paper layer to obtain a paper layer having an antistatic layer;

[0043] S300, spraying an antibacterial layer: spraying an antibacterial agent on the other side of the paper layer relative to the bottom surface to obtain a paper layer having an antistatic layer and an antibacterial layer;

[0044] S400, coating a protective layer: melting the modified PLA particles and uniformly coating the particles on the surface of the antibacterial layer to obtain an environmentally friendly antibacterial and moisture-proof photovoltaic isolation paper;

[0045] Among them, pulp includes virgin wood pulp, bamboo pulp and recycled pulp.

[0046] Preferably, the present invention includes an antistatic layer, a paper layer, an antibacterial layer and a protective layer. The synergistic effect between the composite layers is used to make the performance of the environmentally friendly antibacterial and moisture-proof photovoltaic isolation paper better; the paper layer adopts a combination of virgin wood pulp, bamboo pulp and recycled pulp, and optimizes the fiber ratio to take into account strength, toughness and degradability, and can reduce costs while having environmental protection performance. Among them, the virgin wood pulp provides fiber strength, so that the paper layer has better performance; the bamboo fiber in the bamboo pulp is a natural antibacterial component, which can give the paper layer certain antibacterial properties; the recycled pulp is made by recycling waste paper, which can reduce the use of virgin wood pulp, reduce the consumption of wood, and realize resource recycling; the addition of chemical additives can enhance the mechanical strength, moisture resistance and compatibility of the paper layer, and the chemical additives preferably include sizing agents , enhancer and water repellent; spray antistatic agent on the bottom surface of the paper layer to form an antistatic layer on the bottom surface of the paper layer. Since photovoltaic modules are easy to absorb dust, the antistatic layer reduces static charge, reduces particle pollution, and improves the cleanliness and transmittance of photovoltaic panels; to further improve the antibacterial performance, it is also necessary to spray antibacterial agent on the other side of the paper layer relative to the bottom surface to form an antibacterial layer. The antibacterial agent is preferably a vanillin compound, such as vanillin, ethyl vanillin, vanillic acid, vanillone, etc., and then the modified PLA (polylactic acid) particles are melted and coated on the surface of the antibacterial layer. The antibacterial layer is located between the paper layer and the protective layer to avoid direct wear and tear, so that the antibacterial activity is maintained for more than 12 months, and PLA is a degradable bio-based material, thereby making the environmentally friendly antibacterial and moisture-proof photovoltaic isolation paper more green and environmentally friendly.

[0047] Furthermore, the mass ratio of virgin wood pulp, bamboo pulp and recycled pulp is (9-11):(7-9):(1-2). With virgin wood pulp as the main component, since the content of long fibers in virgin wood pulp is relatively high and the fiber binding force is strong, it can provide good paper formation uniformity and stability while providing excellent mechanical properties for the paper layer, making the paper structure more uniform and more durable. Bamboo pulp contains more medium-length fibers, which can endow the paper layer with softness, interweave with wood pulp, fill the fiber gaps, improve the paper tightness, reduce the light transmittance, and avoid the performance attenuation of photovoltaic modules caused by light. Moreover, bamboo pulp is rich in bamboo phenol, bamboo flavone and bamboo quinone, which have natural antibacterial, bacteriostatic and antifungal properties, reduce the growth of microorganisms, and prevent the photovoltaic modules from being polluted in a humid environment. In addition, bamboo pulp is a renewable resource with a short production cycle and low carbon emissions, which can promote environmental protection. Recycled pulp is a resource reuse that reduces the carbon footprint and meets the environmental protection requirements. Although the fibers in recycled pulp are shorter, which will lead to lower paper strength, it helps to improve the uniformity of the formed paper. And most of the lignin has been removed during the production process of recycled pulp, so its sizing effect is better and the water resistance can be improved. Using this ratio can meet the requirements of photovoltaic separator paper in terms of protection, environmental protection and sustainability.

[0048] Preferably, the antistatic agent includes a mixture of polylactic acid-glycerol ester and nano-graphene oxide. The mixture of polylactic acid-glycerol ester and nano-graphene oxide has both degradability, long-term stability and high-efficiency antistatic properties, and is an ideal antistatic agent.

[0049] Furthermore, the preparation method of the antistatic agent includes:

[0050] S201. Prepare a polylactic acid-glycerol ester emulsion: Dissolve polylactic acid in ethanol, then slowly drop in glycerol and polyethylene glycol, and stir evenly to obtain a polylactic acid-glycerol ester emulsion;

[0051] S202. Prepare a nano-graphene oxide dispersion: Add nano-graphene oxide particles to deionized water for the first ultrasonic dispersion treatment, and then add an ultrasonic dispersant to obtain a nano-graphene oxide dispersion;

[0052] S203. Prepare the antistatic agent: Add the nano-graphene oxide dispersion to the polylactic acid-glycerol ester emulsion, stir evenly, and then perform a filtration treatment to obtain the antistatic agent;

[0053] Among them, the ultrasonic dispersant includes any one of Tween 80, Span 80, chitosan or polyvinylpyrrolidone.

[0054] Preferably, in the process of preparing the antistatic agent, it is necessary to prepare a polylactic acid-glycerol ester emulsion and a nano-graphene oxide dispersion. Since polylactic acid is difficult to be directly dispersed in water, glycerol and polyethylene glycol help to form a stable emulsion system. After dissolving polylactic acid with ethanol, glycerol and polyethylene glycol are gradually introduced to increase its ductility and form a stable O / W emulsion, making it more suitable as a coating material. Nano-graphene oxide has high conductivity and can improve the antistatic performance of the antistatic agent. The nano-graphene oxide particles are added to deionized water for the first ultrasonic dispersion treatment. The frequency of the first ultrasonic dispersion treatment is preferably 40 - 50 kHz, and the time is 30 - 45 min, which helps to improve the dispersion of the nano-graphene oxide particles. Adding an ultrasonic dispersant can further improve the dispersion of the nano-graphene oxide particles. The nano-graphene oxide dispersion is added to the polylactic acid-glycerol ester emulsion and stirred evenly. Preferably, magnetic stirring is carried out at a speed of 500 rpm for 30 min, and then filtration treatment is carried out to remove the undispersed nano-graphene oxide particles, obtaining the antistatic agent. This antistatic agent is environmentally friendly, uses a water / ethanol solvent system throughout the process, has zero VOC emissions, has a simple process and controllable cost, meeting the sustainable development requirements of the photovoltaic industry for functional materials.

[0055] Preferably, in S201, the mass ratio of polylactic acid, glycerol and polyethylene glycol is (7 - 7.5):(1.5 - 2):1; and / or in S202, the mass ratio of nano-graphene oxide particles, ultrasonic dispersant and deionized water is (0.01 - 0.03):0.002:1; and / or in S202, the particle size of the nano-graphene oxide particles is 50 - 100 nm; and / or in S203, the mass ratio of the nano-graphene oxide dispersion and the polylactic acid-glycerol ester emulsion is (1 - 1.5):20.

[0056] Preferably, the preparation method of the modified PLA particles includes:

[0057] S410, predispersion of nano-fillers: The modified nano-silica and carbon black are subjected to the second ultrasonic dispersion treatment to obtain nano-fillers;

[0058] S420, blending of PLA matrix and fillers: The PLA matrix and nano-fillers are mixed and stirred evenly, and then melt-extruded and cut into pellets to obtain the modified PLA particles.

[0059] Preferably, in the process of preparing the modified PLA particles, it is first necessary to pre-disperse the nano-fillers to improve the dispersion uniformity of the nano-fillers, so that the nano-fillers can form a reinforcing network, improve the strength and toughness of the material, ensure that the fillers will not agglomerate in a large area during subsequent blending, optimize the antistatic effect, the carbon fillers can form a conductive channel, reduce the surface resistance, and endow PLA with antistatic properties; then blend and melt granulate the pre-dispersed nano-fillers with the PLA matrix. The mass ratio of the nano-fillers to PLA is preferably 0.1:1. It is preferably to use a twin-screw extruder for melt granulation. By adding nano-fillers, the mechanical properties of PLA are improved, the degradation of PLA in a high-temperature environment is inhibited, and its thermal stability is improved, making it suitable for applications sensitive to static electricity such as photovoltaic separator paper.

[0060] Further, S410 includes:

[0061] S411. Dissolve the coupling agent in an ethanol aqueous solution and stir, then add nano-silica, and perform a third ultrasonic dispersion treatment and a first drying treatment in sequence to obtain modified nano-silica;

[0062] S412. Add the carbon black raw material to the mixed acid for acidification treatment to obtain carbon black;

[0063] S413. Add the modified nano-silica and carbon black to ethanol and perform a second ultrasonic dispersion treatment and a second drying treatment in sequence to obtain nano-fillers;

[0064] Among them, the mixed acid includes a mixture of sulfuric acid and nitric acid.

[0065] Preferably, before pre-dispersing the nano-silica particles and carbon black, it is first necessary to modify the nano-silica particles and acidify the carbon black so that the modified PLA particles obtained after subsequent mixing and melt granulation with PLA have better properties; the nano-silica particles can form a micron-level barrier layer to reduce the water absorption of PLA and improve its moisture resistance, and the carbon black can reduce the surface resistance of PLA; when modifying the nano-silica particles, first dissolve the coupling agent in an ethanol aqueous solution and stir, then add the nano-silica and perform the third ultrasonic dispersion treatment to form an active layer of the coupling agent such as KH-550, KH-560, etc. on the surface of the nano-silica particles, enhance the interfacial bonding between the silica and PLA, prevent the filler from falling off, and improve the mechanical properties; then perform a drying treatment to remove the solvent and avoid residual moisture affecting subsequent processing; acidify the carbon black, and the acidification treatment is preferably carried out at 70 °C for 2 h, which can remove the inorganic impurities in the carbon black, improve the purity, further enhance the conductive stability, make the carbon black easier to form a conductive network, improve the antistatic performance of the composite material, and at the same time, functional groups such as carboxyl and hydroxyl can be introduced onto the carbon black to improve the hydrophilicity of the carbon black and make it disperse more uniformly in PLA, then disperse it in ethanol, remove impurities, and improve its polarity; add the modified nano-silica and carbon black to ethanol and perform the second ultrasonic dispersion treatment in turn, preferably using a frequency of 35 - 40 kHz for the second ultrasonic treatment for 30 - 40 min to break the filler agglomeration and improve the uniformity, and then remove the ethanol through a drying treatment to obtain a highly dispersed dry powder for convenient subsequent co-blending and granulation.

[0066] Preferably, in S411, the mass ratio of nano-silica, coupling agent to ethanol aqueous solution is 1:(0.01 - 0.03):(2 - 3); and / or in S411, the frequency of the third ultrasonic dispersion treatment is 40 - 50 kHz, the temperature is 50 - 60 °C, and the time is 30 - 60 min; and / or in S411, the drying treatment time is 1 - 4 h, and the temperature is 60 - 80 °C; and / or in S412, in the mixed acid, the volume ratio of sulfuric acid to nitric acid is (1 - 1.2):3; and / or in S412, the mass-volume ratio of carbon black to mixed acid is 1 g:20 mL.

[0067] Preferably, between S100 and S200, it further includes:

[0068] S110, corona-treat the paper layer;

[0069] After the corona treatment, the dyne value of the paper layer is 46 - 52 dyne.

[0070] Preferably, corona treatment is a high-frequency high-voltage discharge technology mainly used to increase the surface energy of materials, thereby improving the adhesion of coatings or printing. Before spraying the antistatic layer, corona treatment is performed on the paper layer. By bombarding the surface of the paper layer with high-voltage discharge, oxidation functional groups are formed. The purpose is to increase the surface energy of the paper layer so that its dyne value reaches 46 - 52 dyne, ensuring good adhesion of the antistatic layer. Corona treatment is preferably carried out in an air atmosphere, with a power of 500 - 800 W, a time of 1 - 3 s, and an electrode spacing of 3 - 5 mm.

[0071] Preferably, the thickness of the antistatic layer is 3 - 7 μm, which can prevent static electricity accumulation and ensure the safety and stability of the photovoltaic isolation paper. The thickness of the paper layer is 40 - 60 μm, providing structural support for the environmentally friendly antibacterial and moisture-proof photovoltaic isolation paper and determining the mechanical properties and processing adaptability of the isolation paper. The thickness of the antibacterial layer is 5 - 10 μm, which can inhibit the growth of microorganisms and extend the service life of the photovoltaic isolation paper. The thickness of the protective layer is 2 - 3 μm, which can prevent moisture, prevent dirt, improve weather resistance, and effectively protect the antibacterial layer and the paper layer.

[0072] Example 1

[0073] The present invention provides a method for preparing an environmentally friendly antibacterial and moisture-proof photovoltaic isolation paper. The preparation method includes the following steps:

[0074] S100. Prepare the paper layer: Add chemical additives to the pulp and stir evenly, then make paper by papermaking to obtain the paper layer.

[0075] S200. Spray the antistatic layer: Spray the antistatic agent on the bottom surface of the paper layer to obtain a paper layer with an antistatic layer.

[0076] S300. Spray the antibacterial layer: Spray the antibacterial agent on the other side of the paper layer relative to the bottom surface to obtain a paper layer with an antistatic layer and an antibacterial layer.

[0077] S400. Coat the protective layer: Melt the modified PLA particles and evenly coat them on the surface of the antibacterial layer to obtain the environmentally friendly antibacterial and moisture-proof photovoltaic isolation paper.

[0078] Among them, the pulp includes virgin wood pulp, bamboo pulp, and recycled pulp, and the mass ratio of virgin wood pulp, bamboo pulp, and recycled pulp is 9:7:1. The antistatic agent is a polylactic acid - glycerol ester emulsion, and the antibacterial agent is vanillin. The thickness of the antistatic layer of the prepared environmentally friendly antibacterial and moisture-proof photovoltaic isolation paper is 3 μm, the thickness of the paper layer is 40 μm, the thickness of the antibacterial layer is 5 μm, and the thickness of the protective layer is 2 μm.

[0079] Example 2

[0080] The present invention provides a method for preparing an environmentally friendly antibacterial and moisture-proof photovoltaic isolation paper. The preparation method includes the following steps:

[0081] S100, Prepare the paper layer: Add chemical additives to the pulp, stir evenly, and form paper by papermaking to obtain the paper layer;

[0082] S200, Spray the antistatic layer: Spray the antistatic agent on the bottom surface of the paper layer to obtain a paper layer with an antistatic layer;

[0083] S300, Spray the antibacterial layer: Spray the antibacterial agent on the other side of the paper layer relative to the bottom surface to obtain a paper layer with an antistatic layer and an antibacterial layer;

[0084] S400, Coat the protective layer: Melt the modified PLA particles and evenly coat them on the surface of the antibacterial layer to obtain an environmentally friendly antibacterial and moisture-proof photovoltaic isolation paper;

[0085] Among them, between S100 and S200, there is also included: S110, Conduct corona treatment on the paper layer; After corona treatment, the dyne value of the paper layer is 46 dyne;

[0086] The antistatic agent includes a mixture of polylactic acid-glycerol ester and nano-graphene oxide; The preparation method of the antistatic agent includes:

[0087] S201, Prepare the polylactic acid-glycerol ester emulsion: Dissolve polylactic acid in ethanol, and then slowly drop in glycerol and polyethylene glycol. The mass ratio of polylactic acid, glycerol and polyethylene glycol is 7:1.5:1, stir evenly to obtain the polylactic acid-glycerol ester emulsion;

[0088] S202, Prepare the nano-graphene oxide dispersion: Add nano-graphene oxide particles with a particle size of 50 nm to deionized water and perform the first ultrasonic dispersion treatment at a frequency of 40 kHz for 30 min, then add an ultrasonic dispersant. The mass ratio of nano-graphene oxide particles, ultrasonic dispersant and deionized water is 0.01:0.002:1 to obtain the nano-graphene oxide dispersion;

[0089] S203, Prepare the antistatic agent: Add the nano-graphene oxide dispersion to the polylactic acid-glycerol ester emulsion, stir evenly. The mass ratio of the nano-graphene oxide dispersion and the polylactic acid-glycerol ester emulsion is 1:20, and then perform filtration treatment to obtain the antistatic agent;

[0090] The ultrasonic dispersant includes any one of Tween 80, Span 80, chitosan or polyvinylpyrrolidone; The pulp includes virgin wood pulp, bamboo pulp and recycled pulp. The mass ratio of virgin wood pulp, bamboo pulp and recycled pulp is 11:9:2; The antibacterial agent is ethyl vanillin. The thickness of the antistatic layer of the prepared environmentally friendly antibacterial and moisture-proof photovoltaic isolation paper is 7 μm, the thickness of the paper layer is 60 μm, the thickness of the antibacterial layer is 10 μm, and the thickness of the protective layer is 3 μm.

[0091] Example Three

[0092] The present invention provides a preparation method of an environment-friendly antibacterial and moisture-proof photovoltaic separator paper, and the preparation method includes the following steps:

[0093] S100. Prepare a paper layer: Add a chemical additive to pulp, stir evenly, and form paper by papermaking to obtain a paper layer;

[0094] S200. Spray an antistatic layer: Spray an antistatic agent on the bottom surface of the paper layer to obtain a paper layer with an antistatic layer;

[0095] S300. Spray an antibacterial layer: Spray an antibacterial agent on the other side of the paper layer relative to the bottom surface to obtain a paper layer with an antistatic layer and an antibacterial layer;

[0096] S400. Coat a protective layer: Melt modified PLA particles and uniformly coat them on the surface of the antibacterial layer to obtain an environment-friendly antibacterial and moisture-proof photovoltaic separator paper;

[0097] Wherein, between S100 and S200, it further includes: S110. Perform corona treatment on the paper layer; after the corona treatment, the dyne value of the paper layer is 46 dyne;

[0098] The antistatic agent includes a mixture of polylactic acid-glycerol ester and nano-graphene oxide; the preparation method of the antistatic agent includes:

[0099] S201. Prepare a polylactic acid-glycerol ester emulsion: Dissolve polylactic acid in ethanol, and then slowly drop in glycerol and polyethylene glycol. The mass ratio of polylactic acid, glycerol and polyethylene glycol is 7:1.5:1, stir evenly to obtain a polylactic acid-glycerol ester emulsion;

[0100] S202. Prepare a nano-graphene oxide dispersion: Add nano-graphene oxide particles with a particle size of 50 nm to deionized water and perform the first ultrasonic dispersion treatment at a frequency of 40 kHz for 30 min, and then add an ultrasonic dispersant. The mass ratio of nano-graphene oxide particles, ultrasonic dispersant and deionized water is 0.01:0.002:1 to obtain a nano-graphene oxide dispersion;

[0101] S203. Prepare an antistatic agent: Add the nano-graphene oxide dispersion to the polylactic acid-glycerol ester emulsion, stir evenly, the mass ratio of the nano-graphene oxide dispersion and the polylactic acid-glycerol ester emulsion is 1:20, and then perform filtration treatment to obtain an antistatic agent;

[0102] The preparation method of the modified PLA particles includes:

[0103] S410. Pre-dispersion of nano-fillers: Perform the second ultrasonic dispersion treatment on modified nano-silica and carbon black to obtain nano-fillers;

[0104] S420. Blending of PLA matrix and filler: Mix the PLA matrix and the nano-filler in a mass ratio of 0.1:1, stir evenly, melt-extrude and cut into pellets to obtain modified PLA pellets;

[0105] S410 includes:

[0106] S411. Dissolve the coupling agent in an ethanol aqueous solution and conduct a stirring treatment, then add nano-silica. The mass ratio of nano-silica, KH-550 to the ethanol aqueous solution is 1:0.01:2. Conduct the third ultrasonic dispersion treatment at a frequency of 40 kHz at 50 °C for 60 min, and then conduct the first drying treatment at 80 °C for 1 h to obtain modified nano-silica;

[0107] S412. Add the carbon black raw material to the mixed acid and conduct an acidification treatment at 70 °C for 2 h. The mass-volume ratio of carbon black to the mixed acid is 1 g:20 mL to obtain carbon black;

[0108] S413. Add the modified nano-silica and carbon black to ethanol and conduct the second ultrasonic dispersion treatment at a frequency of 40 kHz for 30 min, and then conduct the second drying treatment to obtain the nano-filler;

[0109] Among them, the mixed acid includes a mixture of sulfuric acid and nitric acid, and the volume ratio of sulfuric acid to nitric acid is 1:3;

[0110] The ultrasonic dispersant includes any one of Tween 80, Span 80, chitosan or polyvinylpyrrolidone; the pulp includes virgin wood pulp, bamboo pulp and recycled pulp, and the mass ratio of virgin wood pulp, bamboo pulp and recycled pulp is 10:8:2; the antibacterial agent is vanillic acid. The thickness of the antistatic layer of the environmentally friendly antibacterial and moisture-proof photovoltaic isolation paper made is 5 μm, the thickness of the paper layer is 50 μm, the thickness of the antibacterial layer is 8 μm, and the thickness of the protective layer is 3 μm.

[0111] Performance testing

[0112] Take the samples of the environmentally friendly antibacterial and moisture-proof photovoltaic isolation paper prepared in Examples 1-3 for the following tests:

[0113] Water vapor transmission rate test: The water vapor transmission rate test was carried out on the environmentally friendly antibacterial and moisture-proof photovoltaic separator paper samples prepared in Examples 1-3 in accordance with the standard ASTM E96; Antibacterial property test: The antibacterial property test was carried out on the environmentally friendly antibacterial and moisture-proof photovoltaic separator paper samples prepared in Examples 1-3 in accordance with the standard ISO 22196; Antistatic property test: The antistatic property test was carried out on the environmentally friendly antibacterial and moisture-proof photovoltaic separator paper samples prepared in Examples 1-3 in accordance with the standard ASTM D257; Mechanical property test: Tensile tests were carried out on the environmentally friendly antibacterial and moisture-proof photovoltaic separator paper samples prepared in Examples 1-3; Environmental friendliness test: Biodegradability tests were carried out on the environmentally friendly antibacterial and moisture-proof photovoltaic separator paper samples prepared in Examples 1-3. The test results are shown in Table 1.

[0114] Table 1

[0115]

[0116] As can be seen from Table 1, the environmentally friendly antibacterial and moisture-proof photovoltaic separator paper prepared by the preparation methods of Examples 1-3 has good performance in all aspects, indicating that the environmentally friendly antibacterial and moisture-proof photovoltaic separator paper prepared by the preparation method of the environmentally friendly antibacterial and moisture-proof photovoltaic separator paper of the present invention is good in antibacterial property, moisture-proof property, antistatic property and environmental friendliness; especially the environmentally friendly antibacterial and moisture-proof photovoltaic separator paper of Example 3, which may be due to the use of the modified PLA particles prepared by the preparation method of the modified PLA particles described in the present invention as the protective layer and the antistatic agent prepared by the preparation method of the antistatic agent of the present invention as the antistatic layer, and the paper layer was corona treated before spraying the antistatic agent, so that the performance of the prepared environmentally friendly antibacterial and moisture-proof photovoltaic separator paper is better.

[0117] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing examples, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing examples, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various examples of the present invention.

Claims

1. A preparation method of an environment-friendly antibacterial and moisture-proof photovoltaic isolation paper, characterized in that The environment-friendly antibacterial and moisture-proof photovoltaic separator paper sequentially comprises an antistatic layer, a paper layer, an antibacterial layer and a protective layer from bottom to top, and the preparation method comprises: S100. Preparing the paper layer: adding a chemical additive into pulp and stirring evenly, then making paper by papermaking to obtain the paper layer; S200. Spraying the antistatic layer: spraying an antistatic agent on the bottom surface of the paper layer to obtain the paper layer with the antistatic layer; S300. Spraying the antibacterial layer: spraying an antibacterial agent on the other side of the paper layer relative to the bottom surface to obtain the paper layer with the antistatic layer and the antibacterial layer; S400. Coating the protective layer: melting modified PLA particles and uniformly coating them on the surface of the antibacterial layer to obtain the environment-friendly antibacterial and moisture-proof photovoltaic separator paper; Wherein, the pulp includes virgin wood pulp, bamboo pulp and recycled pulp.

2. The preparation method according to claim 1, wherein The mass ratio of the virgin wood pulp, the bamboo pulp and the recycled pulp is (9-11):(7-9):(1-2).

3. The preparation method according to claim 1, characterized in that, The antistatic agent includes a mixture of polylactic acid-glycerol ester and nano-graphene oxide; The preparation method of the antistatic agent includes: S201. Preparing the polylactic acid-glycerol ester emulsion: dissolving polylactic acid in ethanol, then slowly dropping in glycerol and polyethylene glycol and stirring evenly to obtain the polylactic acid-glycerol ester emulsion; S202. Preparing the nano-graphene oxide dispersion: adding nano-graphene oxide particles into deionized water for the first ultrasonic dispersion treatment, and then adding an ultrasonic dispersant to obtain the nano-graphene oxide dispersion; S203. Preparing the antistatic agent: adding the nano-graphene oxide dispersion into the polylactic acid-glycerol ester emulsion, stirring evenly, and then performing filtration treatment to obtain the antistatic agent; Wherein, the ultrasonic dispersant includes any one of Tween 80, Span 80, chitosan or polyvinylpyrrolidone.

4. The preparation method according to claim 3, wherein In S201, the mass ratio of the polylactic acid, the glycerol and the polyethylene glycol is (7-7.5):(1.5-2):1; and / or In S202, the mass ratio of the nano-graphene oxide particles, the ultrasonic dispersant and the deionized water is (0.01-0.03):0.002:1; and / or In S202, the particle size of the nano-graphene oxide particles is 50-100nm; and / or In S203, the mass ratio of the nano-graphene oxide dispersion and the polylactic acid-glycerol ester emulsion is (1-1.5):

20.

5. The preparation method according to claim 1, wherein The preparation method of the modified PLA particles includes: S410. Predispersion of nano fillers: performing a second ultrasonic dispersion treatment on modified nano-silica and carbon black to obtain the nano fillers; S420. Blending of the PLA matrix and the fillers: mixing the PLA matrix and the nano fillers and stirring evenly, and then melting, extruding and cutting into particles to obtain the modified PLA particles.

6. The preparation method according to claim 5, characterized in that, S410 includes: S411. Dissolve the coupling agent in an ethanol aqueous solution, stir, then add nano-silica, and perform the third ultrasonic dispersion treatment and the first drying treatment in sequence to obtain the modified nano-silica; S412. Add the carbon black raw material to the mixed acid for acidification treatment to obtain the carbon black; S413. Add the modified nano-silica and carbon black to ethanol, and perform the second ultrasonic dispersion treatment and the second drying treatment in sequence to obtain the nano-filler; Among them, the mixed acid includes a mixture of sulfuric acid and nitric acid.

7. The preparation method according to claim 6, wherein In S411, the mass ratio of the nano-silica, the coupling agent to the ethanol aqueous solution is 1:(0.01 - 0.03):(2 - 3); and / or In S411, the frequency of the third ultrasonic dispersion treatment is 40 - 50 kHz, the temperature is 50 - 60 °C, and the time is 30 - 60 min; and / or In S411, the drying time is 1 - 4 h, and the temperature is 60 - 80 °C; and / or In S412, in the mixed acid, the volume ratio of sulfuric acid to nitric acid is (1 - 1.2):3; and / or In S412, the mass-volume ratio of the carbon black to the mixed acid is 1 g:20 mL.

8. The preparation method according to claim 1, wherein Between S100 and S200, there is also included: S110. Perform corona treatment on the paper layer; After the corona treatment, the dyne value of the paper layer is 46 - 52 dyne.

9. The preparation method according to claim 1, wherein The thickness of the antistatic layer is 3 - 7 μm; and / or The thickness of the paper layer is 40 - 60 μm; and / or The thickness of the antibacterial layer is 5 - 10 μm; and / or The thickness of the protective layer is 2 - 3 μm.

10. An environmentally friendly antibacterial and moisture-proof photovoltaic isolation paper, characterized in that, The environment-friendly antibacterial and moisture-proof photovoltaic isolation paper is prepared by using the preparation method according to any one of claims 1 to 9.

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