EB coating for PP film and preparation method of EB coating

Abstract

The invention discloses an EB coating for a PP film, and relates to the technical field of PP film processing, the EB coating comprises a base material, and a transition layer, an antibacterial layer and a scratch-resistant wear-resistant layer which are sequentially arranged on the base material; wherein the antibacterial layer is prepared from the following materials in parts: 10 to 450 parts of nano silver ion particles, 10 to 100 parts of animal and plant extracts, 10 to 90 parts of titanium dioxide and 10 to 110 parts of auxiliaries. The invention further discloses a preparation method of the EB coating for the PP film. Through a material formula and a preparation process, the EB coating can form a hard and compact protective layer on the surface of the PP film, a nano material such as silicon dioxide is uniformly dispersed in the coating, scraping and abrasion of an external object to the surface of the PP film can be effectively resisted, and nano silver ions and a plant extract antibacterial agent added in the coating have the antibacterial effect on the surface of the PP film. The PP film can play a role in inhibiting and killing various bacteria, fungi and virus microorganisms, and a better use environment is brought to the PP film.

Description

Technical Field

[0001] The invention relates to the technical field of PP film processing, and in particular to an EB coating for PP film and a preparation method thereof. Background Art

[0002] Polypropylene (PP) film has been widely used in many fields due to its good chemical stability, mechanical properties and relatively low cost. With the continuous expansion of application scenarios and the increasing requirements for product performance, the performance limitations of PP film have gradually emerged. In some packaging and medical application scenarios with high hygiene requirements, the PP film itself does not have antibacterial properties and is prone to breed bacteria and mold microorganisms, which will not only cause contamination and deterioration of the products in the package, but may also pose a threat to human health. In daily use, the surface of the PP film is easily scratched and worn, reducing its appearance quality and service life. During transportation and packaging, the wear of the PP film surface may cause damage to the packaging and fail to effectively protect the internal products. In this regard, we proposed an EB coating for PP film and a preparation method thereof. Summary of the invention

[0003] In order to solve the above technical problems, an EB coating for PP film and a preparation method thereof are provided. This technical solution solves the above problems of bacterial growth and easy scratching and wear.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: an EB coating for PP film, the EB coating comprising a substrate and a transition layer, an antibacterial layer and an anti-scratch and wear-resistant layer sequentially arranged on the substrate;

[0005] The antibacterial layer is prepared from the following materials: 10-450 parts of nano silver ion particles, 10-100 parts of animal and plant extracts, 10-90 parts of titanium dioxide and 10-110 parts of auxiliary agents; the animal and plant extracts are one or more of silk fibroin, tea polyphenols, allicin and berberine;

[0006] The anti-scratch and wear-resistant layer is prepared from the following materials: 20-450 parts of acrylic resin, 20-550 parts of nano silicon dioxide and 10-90 parts of auxiliary agent.

[0007] Preferably, the antibacterial layer is prepared from the following materials: 110-150 parts of nano silver ion particles, 60-90 parts of animal and plant extracts, 20-50 parts of titanium dioxide and 10-100 parts of auxiliary agents.

[0008] Preferably, the scratch-resistant and wear-resistant layer is prepared from the following materials: 150-250 parts of acrylic resin, 30-100 parts of nano-silicon dioxide and 10-90 parts of additives.

[0009] Preferably, the transition layer comprises titanium dioxide, aluminum oxide, polyurethane, epoxy acrylate and acrylate, the substrate is polycarbonate and / or polypropylene, and the additives include silane coupling agent, leveling agent, thickener, dispersant and defoamer.

[0010] Further preferably, the transition layer is made of the following materials: 150-250 parts of polyurethane, 200-250 parts of epoxy acrylate, 200-350 parts of acrylate monomer, 10-40 parts of titanium dioxide and 10-40 parts of aluminum oxide.

[0011] Preferably, the plant and animal extract is one or more of silk fibroin, tea polyphenols, allicin and berberine, and the auxiliary agent includes a silane coupling agent, a leveling agent, a thickener, a dispersant and a defoaming agent.

[0012] Preferably, silk fibroin can be extracted by the following steps: prepare silkworm cocoon material, weigh the silkworm cocoon material, put the weighed silkworm cocoon into a reactor, add distilled water to completely submerge the silkworm cocoon, add sodium carbonate solution, start the reactor, heat and stir, heat the temperature to 95°C-100°C, stir for 30min-60min, dissolve the sericin in the silkworm cocoon in the solution, wait for the stirring to be completed, take out the solution, take out the silkworm cocoon, rinse with clean water, place the washed silkworm cocoon in a stirring drum, add a solvent to stir, dissolve the silk fibroin, filter after dissolution, and further purify the silk fibroin, dry the purified silk fibroin to obtain silk fibroin powder.

[0013] Preferably, tea polyphenols can be extracted based on alcohol extraction; allicin can be extracted based on steam distillation, after the garlic is chopped, it is distilled, and the allicin is volatilized along with the water vapor and obtained by collection; the berberine extraction method is based on ethanol extraction.

[0014] A method for preparing an EB coating for a PP film, the preparation steps comprising:

[0015] S1. Prepare materials, including PP film, substrate, transition layer, nano silver ion particles, animal and plant extracts, titanium dioxide, additives, acrylic resin and nano silicon dioxide;

[0016] S2, prepare the antibacterial layer, weigh nano silver ion particles, animal and plant extracts, titanium dioxide and additives, place the nano silver ion particles and titanium dioxide in a reaction kettle, stir, add the animal and plant extracts during the stirring process, continue stirring, and wait for sufficient mixing;

[0017] S3, after waiting for the mixing to be completed, add the auxiliary agents into the reactor in sequence, stir and mix, take out from the reactor after mixing, place on the filter net for filtering, filter out impurities and undispersed particles, obtain the antibacterial layer liquid after filtering, and place aside for use;

[0018] S4, preparing a scratch-resistant and wear-resistant layer, weighing acrylic resin, nano-silicon dioxide and auxiliary materials, dispersing the nano-silicon dioxide, and using ultrasonic dispersing equipment for dispersion for 30 minutes;

[0019] S5, adding acrylic resin to the dispersed nano-silicon dioxide solution, stirring, adding additives during the stirring process, stirring time is 1-2h, adjusting the pH value, and heating for 10min to promote the interaction and dissolution of the components, filtering the mixed solution to obtain the anti-scratch and wear-resistant layer liquid, and setting it aside for use;

[0020] S6, coating preparation, cleaning the prepared PP film and the outer surface of the substrate to remove impurities, roughening the outer surface of the substrate and the PP film by chemical etching, and preparing a transition layer liquid;

[0021] S7, bonding the substrate and the PP film, spraying a transition layer on the outer surface of the substrate layer, and continuing to spray the antibacterial layer and the anti-scratch and wear-resistant layer on the transition layer to form a coating film;

[0022] S8. After spraying, the coating is quickly cured by EB curing. After curing, the prepared coating is polished to ensure the flatness and smoothness of the surface.

[0023] S9. Perform quality inspection on the prepared EB coating.

[0024] Preferably, the stirring time in step S2 is 35 minutes, wherein after the reactor is stirred for 25 minutes, the plant and animal extracts are added inside and stirred; in step S3, the additives added include alkane coupling agent, leveling agent, thickener, dispersant and defoamer, wherein the order of adding the additives is thickener, alkane coupling agent, dispersant, leveling agent and defoamer.

[0025] Preferably, the dispersing step in step S4 is:

[0026] A1. Place nano-silicon dioxide in a container, and place the container in a working tank of an ultrasonic dispersion device;

[0027] A2. Set the parameters of the ultrasonic dispersion equipment, including ultrasonic power, ultrasonic time and ultrasonic frequency, start the dispersion equipment and perform dispersion processing;

[0028] A3. Regularly observe the dispersion situation. When there is a dispersion abnormality, promptly suspend the dispersion equipment, correct the parameters, and continue the dispersion process;

[0029] A4. After dispersion is completed, the dispersion liquid is filtered to remove large particles and impurities.

[0030] Preferably, in step S5, the pH value of the mixed solution is determined in advance by the pH adjustment method, and is measured using pH test paper. When the pH value needs to be lowered, an acidic regulator is added to the mixed solution and stirred evenly. When the pH value needs to be increased, an alkaline regulator is added to the mixed solution and stirred evenly, and the addition process is slowly dripped.

[0031] Preferably, in the chemical etching step in step S6, the etchant is pre-proportioned, the surfaces of the substrate and the PP film are cleaned, the cleaned substrate and the PP film are placed in the etchant, stirred, and the etchant is continuously stirred to allow the etchant to completely contact the substrate and the PP film for etching. After the etching, the substrate and the PP film are taken out, cleaned, and dried to form a PP film and substrate with rough outer surfaces.

[0032] Preferably, the quality inspection in step S9 includes antibacterial inspection and anti-scratch and wear resistance inspection.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The present invention enables the EB coating to form a hard and dense protective layer on the surface of the PP film through material formulation and preparation process. Nanomaterials such as silicon dioxide are evenly dispersed in the coating, which can effectively resist scratches and wear on the surface of the PP film by external objects. The nano silver ions and plant extract antibacterial agents added to the coating can inhibit and kill a variety of bacteria, fungi and viral microorganisms, bringing a better use environment for the PP film. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The figure is a flow chart of the preparation steps of the EB coating of the present invention. DETAILED DESCRIPTION

[0036] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0037] Silk fibroin can be extracted by the following steps: prepare silkworm cocoon material, weigh the silkworm cocoon material, put the weighed silkworm cocoon into a reactor, add distilled water to completely submerge the silkworm cocoon, add sodium carbonate solution, start the reactor, heat and stir, heat the temperature to 95°C-100°C, stir for 30min-60min, dissolve the sericin in the silkworm cocoon in the solution, wait for the stirring to be completed, take out the solution, take out the silkworm cocoon, rinse with clean water, place the washed silkworm cocoon in a mixing drum, add solvent to stir, dissolve the silk fibroin, filter after dissolution, and further purify the silk fibroin, dry the purified silk fibroin to obtain silk fibroin powder.

[0038] The tea polyphenols extraction method is based on the alcohol extraction method; the allicin extraction method is based on the steam distillation method. After the garlic is chopped, it is distilled and the allicin is volatilized along with the water vapor and collected; the berberine extraction method is based on the ethanol extraction method.

[0039] The tea polyphenols extraction method is based on the alcohol extraction method, and the steps are as follows:

[0040] B1. Prepare materials, including tea, ethanol and distilled water;

[0041] B2. Pre-treat the tea leaves, wash them with distilled water, and dry the washed tea leaves to remove moisture;

[0042] B3, crushing the dried tea leaves into small particles, placing the crushed tea leaves into an extraction container, and adding a quantitative ethanol solution;

[0043] B4. Seal the extraction container and place it at a quantitative temperature for soaking extraction. The extraction temperature is 40°C-60°C and the extraction time is 1h-3h;

[0044] B5, filtering the solution after soaking and extraction through a filtering device to remove insoluble impurities in tea residues;

[0045] B6, concentrating the filtered extract, and placing the concentrated extract in a vacuum drying oven for drying;

[0046] B7. Grind the dried tea polyphenols extract into powder, put it into a sealed container, and store it in a cool and dry place to complete the preparation.

[0047] The berberine extraction method is based on the ethanol extraction method, and the extraction steps are:

[0048] C1. Prepare berberine medicinal materials, ethanol, distilled water and hydrochloric acid;

[0049] C2. Wash the medicinal materials, remove impurities, dry them, and crush the dried medicinal materials into small particles to increase the contact area with the extraction solvent;

[0050] C3. Place the crushed medicinal materials into an extraction container and add ethanol;

[0051] C4, soaking and extracting at a temperature of 50℃-70℃;

[0052] C5, filtering the extracted solution through a filtering device to remove insoluble impurities in the medicinal residue, concentrating the filtered ethanol extract, and recovering ethanol;

[0053] C6. Dissolve the concentrated residue with dilute hydrochloric acid to dissolve berberine in the acid water;

[0054] C7. Place the purified berberine precipitate in a vacuum drying oven for drying to obtain a berberine extract.

[0055] Preparation Example

[0056] A method for preparing an EB coating for a PP film, the preparation steps comprising:

[0057] S1. Prepare materials, including PP film, substrate, transition layer, nano silver ion particles, animal and plant extracts, titanium dioxide, additives, acrylic resin and nano silicon dioxide;

[0058] S2, prepare the antibacterial layer, weigh nano silver ion particles, animal and plant extracts, titanium dioxide and additives, place the nano silver ion particles and titanium dioxide in a reaction kettle, stir, add the animal and plant extracts during the stirring process, continue stirring, and wait for sufficient mixing;

[0059] S3, after waiting for the mixing to be completed, add the auxiliary agents into the reactor in sequence, stir and mix, take out from the reactor after mixing, place on the filter net for filtering, filter out impurities and undispersed particles, obtain the antibacterial layer liquid after filtering, and place aside for use;

[0060] S4, preparing a scratch-resistant and wear-resistant layer, weighing acrylic resin, nano-silicon dioxide and auxiliary materials, dispersing the nano-silicon dioxide, and using ultrasonic dispersing equipment for dispersion for 30 minutes;

[0061] S5, adding acrylic resin to the dispersed nano-silicon dioxide solution, stirring, adding additives during the stirring process, stirring time is 1-2h, adjusting the pH value, and heating for 10min to promote the interaction and dissolution of the components, filtering the mixed solution to obtain the anti-scratch and wear-resistant layer liquid, and setting it aside for use;

[0062] S6, coating preparation, cleaning the prepared PP film and the outer surface of the substrate to remove impurities, roughening the outer surface of the substrate and the PP film by chemical etching, and preparing a transition layer liquid;

[0063] S7, bonding the substrate and the PP film, spraying a transition layer on the outer surface of the substrate layer, and continuing to spray the antibacterial layer and the anti-scratch and wear-resistant layer on the transition layer to form a coating film;

[0064] S8. After spraying, the coating is quickly cured by EB curing. After curing, the prepared coating is polished to ensure the flatness and smoothness of the surface.

[0065] S9. Perform quality inspection on the prepared EB coating.

[0066] Example 1

[0067] The EB coating for PP film comprises a substrate and a transition layer, an antibacterial layer and an anti-scratch and wear-resistant layer which are arranged on the substrate in sequence, wherein the substrate is a polycarbonate or polypropylene film.

[0068] The transition layer is made of the following materials: 210 parts of polyurethane, 210 parts of epoxy acrylate, 250 parts of acrylate monomer, 30 parts of titanium dioxide and 20 parts of aluminum oxide.

[0069] The antibacterial layer is made of the following materials: 120 parts of nano silver ion particles, 70 parts of silk fibroin, 30 parts of titanium dioxide and 80 parts of auxiliary agents;

[0070] The anti-scratch and wear-resistant layer is made of the following materials: 190 parts of acrylic resin, 50 parts of nano silicon dioxide and 70 parts of additives.

[0071] Example 2

[0072] The EB coating for PP film comprises a substrate and a transition layer, an antibacterial layer and an anti-scratch and wear-resistant layer which are arranged on the substrate in sequence, wherein the substrate is a polycarbonate or polypropylene film.

[0073] The transition layer is made of the following materials: 190 parts of polyurethane, 200 parts of epoxy acrylate, 240 parts of acrylate monomer, 20 parts of titanium dioxide and 20 parts of aluminum oxide.

[0074] The antibacterial layer is made of the following materials: 140 parts of nano silver ion particles, 70 parts of tea polyphenols, 30 parts of titanium dioxide and 70 parts of auxiliary agents;

[0075] The anti-scratch and wear-resistant layer is made of the following materials: 190 parts of acrylic resin, 40 parts of nano silicon dioxide and 80 parts of additives.

[0076] Example 3

[0077] The EB coating for PP film comprises a substrate and a transition layer, an antibacterial layer and an anti-scratch and wear-resistant layer which are arranged on the substrate in sequence, wherein the substrate is a polycarbonate or polypropylene film.

[0078] The transition layer is made of the following materials: 230 parts of polyurethane, 230 parts of epoxy acrylate, 300 parts of acrylate monomer, 20 parts of titanium dioxide and 20 parts of aluminum oxide.

[0079] The antibacterial layer is made of the following materials: 120 parts of nano silver ion particles, 70 parts of berberine, 30 parts of titanium dioxide and 80 parts of auxiliary agents;

[0080] The anti-scratch and wear-resistant layer is made of the following materials: 220 parts of acrylic resin, 40 parts of nano silicon dioxide and 80 parts of additives.

[0081] Comparative Example 1

[0082] A preparation step of EB coating of PP film is as follows:

[0083] S1. Weigh the raw materials and prepare the solvent;

[0084] S2. According to the ratio of Example 1, the nanomaterials, plant and animal extracts, titanium dioxide and nano silicon dioxide are dispersed, and acrylate monomers, acrylic resins and additives are added. The mixed solution is homogenized by a high-speed homogenizer, and the components in the transition layer are added and mixed evenly.

[0085] S3, directly bonding the substrate to the PP film, spraying the liquid obtained in step S3 on the outer surface of the substrate layer, performing EB curing, and polishing the cured PP film to obtain an EB film for the PP film.

[0086] Comparative Example 2

[0087] A preparation step of EB coating of PP film is as follows:

[0088] S1. Weigh the raw materials and prepare the solvent;

[0089] S2, according to the ratio of Example 2, the nano material, titanium dioxide and nano silicon dioxide are dispersed, and acrylate monomer, acrylic resin and additives are added, the mixed solution is homogenized by a high-speed homogenizer, and the components in the transition layer are added and mixed evenly;

[0090] S3, directly bonding the substrate to the PP film, spraying the liquid obtained in step S3 on the outer surface of the substrate layer, performing EB curing, and polishing the cured PP film to obtain an EB film for the PP film.

[0091] In Example 1, the substrate and the PP film are first subjected to chemical etching and roughening treatment before coating each layer, so that the mechanical anchoring effect between the coating and the substrate is enhanced and the bonding is more firm. However, Comparative Example 1 does not mention the surface roughening treatment step, and the bonding force between the coating and the substrate is relatively weak. During use, stratification and peeling problems may occur more easily, affecting the service life of the product. In Example 1, when preparing the antibacterial layer, the nano silver ion particles and titanium dioxide are first stirred, and then animal and plant extracts and additives are gradually added and filtered. When preparing the scratch-resistant and wear-resistant layer, the nano silicon dioxide is ultrasonically dispersed in multiple steps to perform fine operations, so that the components are dispersed more evenly, and the antibacterial and scratch-resistant and wear-resistant properties of the coating are more outstanding. Example 1 has a special transition layer, which can better coordinate the performance differences between the substrate and the functional coating, so that the overall performance of the coating is more stable. In Example 1, the antibacterial layer and the scratch-resistant and wear-resistant layer are prepared and filtered respectively. After each step is completed, there is a spare process, which can detect problems and adjust them in time, and the quality control is more accurate.

[0092] Antibacterial testing experiment

[0093] The PP film samples coated with EB coating, i.e., Examples 1-3, and the control sample, i.e., Comparative Example 1, were placed in sterile culture dishes respectively;

[0094] Use a pipette to draw 1 mL of bacterial solution and evenly drip it on the surface of the sample to make sure that the bacterial solution and the sample are in full contact. The amount of bacterial solution dripped should be moderate to ensure that it can cover the surface of the sample but not flow too much;

[0095] Seal the culture dish and place it at a suitable temperature for a certain period of time, which is 24h-48h. The culture temperature is determined according to the characteristics of the bacteria. Escherichia coli and Staphylococcus aureus are usually cultured at 37℃, and Candida albicans is cultured at 28℃-30℃;

[0096] After the incubation time is over, use sterile tweezers to take the sample out of the culture dish, put it into a test tube containing an appropriate amount of sterile saline, and shake it thoroughly to clean the bacteria on the surface of the sample;

[0097] Take the washed bacterial solution and dilute it with sterile saline;

[0098] Take bacterial solutions of different dilutions and spread them on the surface of solid culture medium respectively, and make three parallels for each dilution;

[0099] Place the coated culture medium upside down in an incubator and culture for a certain period of time, then count the number of colonies on the culture medium;

[0100] The colony count was calculated using the formula:

[0101] Q=[(ab) / a]*100%

[0102] Wherein Q is the antibacterial rate, a is the number of colonies in comparative example 1, b is the number of colonies corresponding to Examples 1-3 or comparative example 2, and d is the number of colonies in comparative example 1. The results are shown in Table 1.

[0103] Table 1

[0104] Example 1 Example 2 Example 3 Comparative Example 2 Antibacterial rate 62.5％ 45％ 47.5％ -202.5％

[0105] It can be seen that the methods of Examples 1-3 can achieve better antibacterial effects compared with the non-stratified mixing method in Comparative Example 1. When Comparative Example 2 does not contain animal and plant extracts, the antibacterial effect cannot be achieved.

[0106] Scratch and wear resistance test

[0107] Prepare samples of Examples 1-3 and Comparative Examples 1-2, start the friction and wear tester, and allow the friction medium to perform reciprocating or rotational friction on the sample surface. The friction lasts for 2 minutes during the test.

[0108] After the test, take out the sample and observe the wear condition of the sample surface with the naked eye or a magnifying glass, record whether there are obvious scratches, wear marks, coating peeling phenomenon, and use a microscope to assist in observing the microscopic morphology changes of the sample surface before and after wear. The judgment criteria are:

[0109] Grade A: no scratches, no signs of wear, no coating peeling;

[0110] Grade B: There are slight scratches, slight wear marks, or slight coating peeling;

[0111] Grade C: There are obvious scratches, obvious signs of wear, or obvious coating peeling.

[0112] The examples 1-3 were compared with the comparative examples 1-2 to analyze the improvement of the scratch resistance and wear resistance. The results are shown in Table 2.

[0113] Table 2

[0114] project Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Scratch and abrasion resistance A-level A-level A-level Class B C-Class

[0115] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. An EB coating for PP film, characterized in that: The EB coating includes a substrate and a transition layer, an antibacterial layer and an anti-scratch and wear-resistant layer sequentially arranged on the substrate; The antibacterial layer is prepared from the following materials: 10-450 parts of nano silver ion particles, 10-100 parts of animal and plant extracts, 10-90 parts of titanium dioxide and 10-110 parts of auxiliary agents; the animal and plant extracts are one or more of silk fibroin, tea polyphenols, allicin and berberine; The anti-scratch and wear-resistant layer is prepared from the following materials: 20-450 parts of acrylic resin, 20-550 parts of nano silicon dioxide and 10-90 parts of auxiliary agent.

2. The EB coating for PP film according to claim 1, characterized in that: The antibacterial layer is prepared from the following materials: 110-150 parts of nano silver ion particles, 60-90 parts of animal and plant extracts, 20-50 parts of titanium dioxide and 10-100 parts of auxiliary agents; The anti-scratch and wear-resistant layer is prepared from the following materials: 150-250 parts of acrylic resin, 30-100 parts of nano silicon dioxide and 10-90 parts of auxiliary agent.

3. The EB coating for PP film according to claim 1 or 2, characterized in that: The transition layer includes titanium dioxide, aluminum oxide, polyurethane, epoxy acrylate and acrylate, the substrate is polycarbonate and / or polypropylene, and the auxiliary agents include silane coupling agent, leveling agent, thickener, dispersant and defoamer.

4. The EB coating for PP film according to claim 3, characterized in that: The transition layer is made of the following materials: 150-250 parts of polyurethane, 200-250 parts of epoxy acrylate, 200-350 parts of acrylate monomer, 10-40 parts of titanium dioxide and 10-40 parts of aluminum oxide.

5. The EB coating for PP film according to claim 1 or 2, characterized in that: The silk fibroin extraction step is to prepare the silk cocoon material, weigh the silk cocoon material, put the weighed silk cocoon into a reactor, add distilled water to completely submerge the silk cocoon, add sodium carbonate solution, start the reactor, heat and stir, heat the temperature to 95°C-100°C, stir for 30min-60min, dissolve the sericin in the silk cocoon in the solution, wait for the stirring to be completed, take out the solution, take out the silk cocoon, rinse with clean water, place the washed silk cocoon in a stirring drum, add solvent and stir, dissolve the silk fibroin, filter after dissolution, and further purify the silk fibroin, dry the purified silk fibroin to obtain silk fibroin powder; the tea polyphenol extraction method is based on the alcohol extraction method; the allicin is extracted based on the steam distillation method, the garlic is chopped and distilled, and the allicin evaporates along with the water vapor and is collected; the berberine extraction method is based on the ethanol extraction method.

6. A method for preparing an EB coating for a PP film according to claim 1, characterized in that: The preparation steps include: S1. Prepare materials, including PP film, substrate, transition layer, nano silver ion particles, animal and plant extracts, titanium dioxide, additives, acrylic resin and nano silicon dioxide; S2, prepare the antibacterial layer, weigh nano silver ion particles, animal and plant extracts, titanium dioxide and additives, first place the nano silver ion particles and titanium dioxide in a reaction kettle, stir, add the animal and plant extracts during the stirring process, continue stirring, and wait for sufficient mixing; S3, after waiting for the mixing to be completed, add the auxiliary agents into the reactor in sequence, stir and mix, take out from the reactor after mixing, place on the filter net for filtering, filter out impurities and undispersed particles, obtain the antibacterial layer liquid after filtering, and place aside for use; S4, preparing a scratch-resistant and wear-resistant layer, weighing acrylic resin, nano-silicon dioxide and auxiliary materials, dispersing the nano-silicon dioxide, and using ultrasonic dispersing equipment for dispersion for 30 minutes; S5, adding acrylic resin to the dispersed nano-silicon dioxide solution, stirring, adding additives during the stirring process, stirring time is 1-2h, adjusting the pH value, and heating for 10min to promote the interaction and dissolution of the components, filtering the mixed solution to obtain the anti-scratch and wear-resistant layer liquid, and setting it aside for use; S6, coating preparation, cleaning the prepared PP film and the outer surface of the substrate to remove impurities, roughening the outer surface of the substrate and the PP film by chemical etching, and preparing a transition layer liquid; S7, bonding the substrate and the PP film, spraying a transition layer on the outer surface of the substrate layer, and continuing to spray the antibacterial layer and the anti-scratch and wear-resistant layer on the transition layer to form a coating film; S8. After spraying, the coating is quickly cured by EB curing. After curing, the prepared coating is polished to ensure the flatness and smoothness of the surface. S9. Perform quality inspection on the prepared EB coating.

7. The method for preparing the EB coating for PP film according to claim 6, characterized in that: The stirring time in step S2 is 35 minutes, wherein after the reactor is stirred for 25 minutes, the plant and animal extracts are added inside and stirred; the additives added in step S3 include alkane coupling agent, leveling agent, thickener, dispersant and defoamer, wherein the order of adding the additives is thickener, alkane coupling agent, dispersant, leveling agent and defoamer.

8. The method for preparing the EB coating for PP film according to claim 6, characterized in that: The dispersion processing steps in step S4 are: A1. Place nano-silicon dioxide in a container, and place the container in a working tank of an ultrasonic dispersion device; A2. Set the parameters of the ultrasonic dispersion equipment, including ultrasonic power, ultrasonic time and ultrasonic frequency, start the dispersion equipment and perform dispersion processing; A3. Regularly observe the dispersion situation. When there is a dispersion abnormality, promptly suspend the dispersion equipment, correct the parameters, and continue the dispersion process; A4. After dispersion is completed, the dispersion liquid is filtered to remove large particles and impurities.

9. The method for preparing an EB coating for a PP film according to claim 6, characterized in that: In step S5, the pH value of the mixed solution is determined in advance by the pH adjustment method, and is measured using pH test paper. When the pH value needs to be lowered, an acidic regulator is added to the mixed solution and stirred evenly. When the pH value needs to be increased, an alkaline regulator is added to the mixed solution and stirred evenly. The addition process is done slowly and dropwise.

10. The method for preparing an EB coating for a PP film according to claim 6, characterized in that: In the chemical etching step in step S6, the etchant is pre-proportioned, the surfaces of the substrate and the PP film are cleaned, the cleaned substrate and the PP film are placed in the etchant, stirred, and the etchant is continuously stirred to allow the etchant to completely contact the substrate and the PP film for etching. After the etching, the substrate and the PP film are taken out, cleaned, and dried to form a PP film and substrate with rough outer surfaces.

Images