Antibacterial polyolefin film containing olive leaf extract, method for preparing the same, and sanitary napkin using the same

Abstract

The application relates to the technical field of thin films, and particularly discloses an antibacterial polyolefin film containing olive leaf extract, a preparation method of the antibacterial polyolefin film and a sanitary napkin using the antibacterial polyolefin film. The antibacterial polyolefin film containing olive leaf extract comprises a polyolefin film and an antibacterial coating layer arranged on the polyolefin film; raw materials of the antibacterial coating layer comprise 8-12 parts by weight of olive leaf extract and 88-92 parts by weight of an ethanol solution. The preparation method of the antibacterial polyolefin film containing olive leaf extract comprises the following steps: dissolving olive leaf extract in an ethanol solution to obtain a coating solution; performing first coating on the polyolefin film with the coating solution; performing first drying; performing second coating on the coating layer; performing second drying; forming an antibacterial coating layer; and obtaining the antibacterial polyolefin film containing olive leaf extract.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thin films, in particular to an antibacterial polyolefin film containing olive leaf extract and a preparation method thereof and a sanitary napkin using the film. BACKGROUND

[0002] During the female menstrual period, the pudendal part inevitably contacts the sanitary napkin for a long time, which causes more friction and contact, and the wet and hot environment is extremely suitable for the growth of bacteria, which is easy to affect the health of women.

[0003] The common antibacterial case on the market is to add a bacteriostatic surface layer to the core of the sanitary napkin, which has deficiencies in composition, release speed and health impact. SUMMARY

[0004] In order to improve the antibacterial protection effect on the female menstrual period, the present application provides an antibacterial polyolefin film containing olive leaf extract and a preparation method thereof and a sanitary napkin using the film.

[0005] In the first aspect, the present application provides an antibacterial polyolefin film containing olive leaf extract, which adopts the following technical scheme:

[0006] An antibacterial polyolefin film containing olive leaf extract, comprising a polyolefin film and an antibacterial coating layer arranged on the polyolefin film; the raw materials of the antibacterial coating layer include 8-12 parts by weight of olive leaf extract and 88-92 parts by weight of ethanol solution.

[0007] By adopting the technical scheme, the antibacterial coating containing olive leaf extract is arranged on the polyolefin film and applied to the sanitary napkin. After the antibacterial coating contacts the slightly alkaline menstrual blood, the active ingredients in the olive leaf extract are released. The active ingredients in the olive leaf extract mainly include oleuropein, flavonoids, terpenes and derivatives thereof. The oleuropein is one of the most bioactive components in the olive leaf and has a broad-spectrum antibacterial effect. The oleuropein can interfere with the metabolism of amino acids or protein synthesis necessary for bacterial growth, thereby inhibiting the proliferation of bacteria. In addition, the research shows that the oleuropein has an inhibitory effect on some viruses, which may be achieved by blocking the adsorption or replication process of the viruses. The oleuropein has a significant inhibitory effect on a variety of gram-positive and gram-negative bacteria, Candida albicans, Campylobacter jejuni, Helicobacter pylori, Escherichia coli and Klebsiella pneumoniae. The flavonoids can provide health benefits through cell signaling pathways and antioxidant effects, and help to enhance the immunity of the body, thereby resisting bacterial infection. The terpenes and derivatives thereof also have a certain antibacterial activity and can synergistically play an antibacterial role with other active ingredients. In addition, the olive leaf extract has no special effect on skin symbiotic bacteria and has a certain plant-based special aroma, which can mask some blood odor, thereby achieving the effects of inhibiting bacteria, inhibiting odor and maintaining the health of the female body. The effective antibacterial characteristics of the olive leaf extract in the pH = 5.0-8.0 range can avoid the misrelease of the normal vagina in the acidic environment with a pH less than 4.5, and improve the durability of the antibacterial effect.

[0008] In a specific embodiment, the method for preparing the olive leaf extract comprises the following steps:

[0009] Raw material pretreatment: the olive leaves are soaked in brine with a mass concentration of 0.85%-0.9% for 1-2h, then washed with clean water, and then crushed into olive particles with a particle size of 1-3mm;

[0010] Enzymatic hydrolysis: water is added to the olive particles, and then an enzyme treatment agent is added, and enzymatic hydrolysis is carried out at 40-60℃ for 3-6h to obtain an enzymatic hydrolysate; the enzyme treatment agent comprises a mixture of cellulase and acid pectinase;

[0011] Ultrasonic treatment: the enzymatic hydrolysate is placed in an ultrasonic extraction instrument for ultrasonic treatment to obtain a treated solution;

[0012] Filtration: the treated solution is filtered by using a filter membrane with a pore size of 0.1-0.45μm to remove macromolecular impurities and residues, and a crude extract is obtained;

[0013] Refinement: 0.8mol / L sulfuric acid solution is added to the crude extract to adjust the pH to 3-4, then an ethanol aqueous solution is added, and the mixture is stirred and mixed uniformly, and then is left to separate into layers. The organic phase is concentrated under reduced pressure to obtain the olive leaf extract.

[0014] By adopting the technical scheme, the olive leaves are first soaked in brine to remove surface impurities, broken to obtain olive particles, then the complex enzyme composed of cellulase and acidic pectinase is added to facilitate the release of active ingredients in the olive particles, then ultrasonic treatment is performed to accelerate the dissolution of the ingredients by cavitation effect, and finally filtration and fine extraction are performed to obtain the olive leaf extract.

[0015] In a specific embodiment, in the enzymolysis step, the weight ratio of cellulase to acidic pectinase in the enzyme treatment agent is 3:1, and the weight ratio of the enzyme treatment agent to the olive particles is (0.3-1.5):100.

[0016] By adopting the technical scheme, the ratio of cellulase to acidic pectinase in the enzyme treatment agent is further limited, and the amount of the enzyme treatment agent is further limited, so as to facilitate the release of active ingredients in the olive particles.

[0017] In a specific embodiment, in the fine extraction step, the temperature of the reduced pressure concentration is 40-50℃, and the concentration is performed to one-tenth of the original volume to obtain the olive leaf extract.

[0018] In a second aspect, the application provides a preparation method of an antibacterial polyolefin film containing olive leaf extract, which adopts the following technical scheme:

[0019] A preparation method of an antibacterial polyolefin film containing olive leaf extract, comprising the following steps:

[0020] The olive leaf extract is dissolved in an ethanol solution to obtain a coating liquid, the coating liquid is first coated on the polyolefin film, then first dried, then second coated on the coating layer, and then second dried to form an antibacterial coating layer, thereby obtaining the antibacterial polyolefin film containing the olive leaf extract.

[0021] By adopting the technical scheme, the olive leaf extract is first dissolved in an ethanol solution to obtain a coating liquid, then the coating liquid is first coated, dried, then second coated, and dried to form a stable antibacterial coating layer, thereby obtaining the antibacterial polyolefin film containing the olive leaf extract.

[0022] In a specific embodiment, the thickness of the antibacterial coating layer is 5-15μm.

[0023] In a specific embodiment, the first drying step is: first dried at 60℃ for 40-50s, and then dried at 45℃ for 2.5-3.5min; and the second drying step is: first dried at 60℃ for 50-70s, and then dried at 45℃ for 3.5-4.5min.

[0024] By adopting the technical scheme, each drying is segmented drying at different temperatures, which not only does not affect the effective components in the olive leaf extract, but also dries the solution as soon as possible.

[0025] In a third aspect, the sanitary napkin provided by the application adopts the following technical scheme:

[0026] The sanitary napkin comprises a surface layer, a core layer and a bottom layer arranged in sequence, the bottom layer comprises the antibacterial polyolefin film containing olive leaf extract, and the antibacterial coating on the antibacterial polyolefin film containing olive leaf extract is attached to the core layer.

[0027] By adopting the technical scheme, the sanitary napkin prepared by using the antibacterial polyolefin film containing olive leaf extract not only plays a precise antibacterial protection role, but also reduces the risk of infection, helps women pay attention to their health, and can also control odor.

[0028] In summary, the application has at least one of the following beneficial technical effects:

[0029] 1. In the application, the antibacterial coating containing olive leaf extract is arranged on the polyolefin film and applied to the sanitary napkin. After contacting the slightly alkaline menstrual blood, the active ingredients in the olive leaf extract are released to play an antibacterial role. In addition, the olive leaf extract has no special effect on skin symbiotic bacteria and has a certain plant special aroma, which can cover up some blood stench, thereby playing the effects of antibacterial, odor control and maintenance of women's health.

[0030] 2. In the method of the application, the olive leaf extract is dissolved in an ethanol solution to obtain a coating solution, then preliminary coating and drying are performed, and then secondary coating and drying are performed to form a stable antibacterial coating, thereby obtaining the antibacterial polyolefin film containing olive leaf extract.

[0031] 3. The sanitary napkin prepared by using the antibacterial polyolefin film containing olive leaf extract in the application not only plays a precise antibacterial protection role, but also reduces the risk of infection, helps women pay attention to their health, and can also control odor. DETAILED DESCRIPTION

[0032] The application will be further described in detail below in combination with the embodiments.

[0033] All raw materials in the embodiments can be obtained on the market. The acid pectinase is provided by Shenzhen Lovefu Biotechnology Co., Ltd.; the cellulase has a CAS number of 9012-54-8; the olive leaf extract powder is provided by Shaanxi Wanyuan Biotechnology Co., Ltd.; and the olive leaves are provided by Sichuan Tianyuan Olive Co., Ltd.

[0034] Preparation Example 1

[0035] Preparation Example 1 provides a method for preparing an olive leaf extract, comprising the following steps:

[0036] Raw material pretreatment: olive leaves are placed in salt water with a mass concentration of 0.85%, the salt water is used to soak the olive leaves for 2 hours, then the olive leaves are washed with clean water, and then the olive particles with a particle size of 1-3 mm are crushed;

[0037] Enzymatic hydrolysis: water is added to the olive particles first, and then an enzyme treatment agent is added, and the enzymatic hydrolysis is carried out at 40°C for 6 hours to obtain an enzymatic hydrolysis liquid; the enzyme treatment agent comprises a mixture of cellulase and acidic pectinase; the weight ratio of cellulase to acidic pectinase in the enzyme treatment agent is 3:1; the weight ratio of the enzyme treatment agent to the olive particles is 0.3:100; and the volume ratio of water to the olive particles is 3:1;

[0038] Ultrasonic treatment: the enzymatic hydrolysis liquid is placed in an ultrasonic extraction instrument, and ultrasonic treatment is carried out at a power of 350w for 30 minutes to obtain a treated liquid;

[0039] Filtration: the treated liquid is filtered by using a filter membrane with a pore size of 0.1 μm to remove macromolecular impurities and residues to obtain a crude extract;

[0040] Refinement: 0.8 mol / L of a sulfuric acid solution is added to the crude extract to adjust the pH to 3, then an ethanol aqueous solution with a mass concentration of 80% is added, and the mixture is stirred and mixed uniformly, and then is left to separate into layers, and the organic phase is concentrated under reduced pressure at 40°C to 1 / 10 of the original volume to obtain an olive leaf extract; the volume ratio of the ethanol aqueous solution to the crude extract is 2:1.

[0041] Preparation Example 2

[0042] Preparation Example 2 provides a method for preparing an olive leaf extract, comprising the following steps:

[0043] Raw material pretreatment: olive leaves are placed in salt water with a mass concentration of 0.87%, the salt water is used to soak the olive leaves for 1.5 hours, then the olive leaves are washed with clean water, and then the olive particles with a particle size of 1-3 mm are crushed;

[0044] Enzymatic hydrolysis: water is added to the olive particles first, and then an enzyme treatment agent is added, and the enzymatic hydrolysis is carried out at 50°C for 4.5 hours to obtain an enzymatic hydrolysis liquid; the enzyme treatment agent comprises a mixture of cellulase and acidic pectinase; the weight ratio of cellulase to acidic pectinase in the enzyme treatment agent is 3:1; the weight ratio of the enzyme treatment agent to the olive particles is 0.9:100; and the volume ratio of water to the olive particles is 4.5:1;

[0045] Ultrasonic treatment: the enzymatic hydrolysis liquid is placed in an ultrasonic extraction instrument, and ultrasonic treatment is carried out at a power of 350w for 45 minutes to obtain a treated liquid;

[0046] Filtering: the treatment solution is filtered by a filter membrane with a pore size of 0.45 μm to remove macromolecular impurities and residues, to obtain a crude extract solution;

[0047] Refining: 0.8 mol / L sulfuric acid solution is added to the crude extract solution to adjust the pH to 3, then 80% ethanol aqueous solution is added, stirred and mixed uniformly, and then left to separate into layers. The organic phase is concentrated under reduced pressure at 45°C to one-tenth of the original volume to obtain an olive leaf extract. The volume ratio of the ethanol aqueous solution to the crude extract solution is 2:1.

[0048] Preparation Example 3

[0049] Preparation Example 3 provides a method for preparing an olive leaf extract, comprising the following steps:

[0050] Raw material pretreatment: olive leaves are placed in 0.89% salt water, the olive leaves are soaked in the salt water until the salt water covers the olive leaves, and then the olive leaves are washed with clean water. Then the olive leaves are crushed into particles with a particle size of 1-3 mm.

[0051] Enzymatic hydrolysis: water is added to the olive particles, and then an enzyme treatment agent is added. The mixture is subjected to enzymatic hydrolysis at 60°C for 3 h to obtain an enzymatic hydrolysis solution. The enzyme treatment agent comprises a mixture of cellulase and acidic pectinase. The weight ratio of cellulase to acidic pectinase in the enzyme treatment agent is 3:1. The weight ratio of the enzyme treatment agent to the olive particles is 1.5:100. The volume ratio of water to the olive particles is 6:1.

[0052] Ultrasonic treatment: the enzymatic hydrolysis solution is placed in an ultrasonic extraction instrument and subjected to ultrasonic treatment at a power of 350 W for 60 min to obtain a treatment solution.

[0053] Filtering: the treatment solution is filtered by a filter membrane with a pore size of 0.45 μm to remove macromolecular impurities and residues, to obtain a crude extract solution;

[0054] Refining: 0.8 mol / L sulfuric acid solution is added to the crude extract solution to adjust the pH to 4, then 80% ethanol aqueous solution is added, stirred and mixed uniformly, and then left to separate into layers. The organic phase is concentrated under reduced pressure at 50°C to one-tenth of the original volume to obtain an olive leaf extract. The volume ratio of the ethanol aqueous solution to the crude extract solution is 2:1.

[0055] Example 1

[0056] Example 1 provides a method for preparing an antibacterial polyolefin film containing an olive leaf extract, comprising the following steps:

[0057] Example 1 provides a method for preparing an antibacterial polyolefin film containing olive leaf extract, comprising the following steps:

[0058] Example 2

[0059] Example 2 provides a method for preparing an antibacterial polyolefin film containing olive leaf extract, comprising the following steps:

[0060] Example 2 provides a method for preparing an antibacterial polyolefin film containing olive leaf extract, comprising the following steps:

[0061] Example 3

[0062] Example 3 provides a method for preparing an antibacterial polyolefin film containing olive leaf extract, comprising the following steps:

[0063] Example 3 provides a method for preparing an antibacterial polyolefin film containing olive leaf extract, comprising the following steps:

[0064] Example 4

[0065] Example 4 provides a method for preparing an antibacterial polyolefin film containing olive leaf extract, comprising the following steps:

[0066] Dissolve 1 kg of olive leaf extract in Example 2 in 9 kg of 90% mass concentration ethanol solution to obtain a coating solution, first coat the coating solution on a polyolefin film with a thickness of 20 μm, then perform a first drying, then perform a second coating on the coating layer, and then perform a second drying to form an antibacterial coating layer with a thickness of 10 μm, thereby obtaining an antibacterial polyolefin film containing olive leaf extract; wherein the first drying step is: first drying at 60°C for 45 s, and then drying at 45°C for 3 min; the second drying step is: first drying at 60°C for 60 s, and then drying at 45°C for 4 min.

[0067] Example 5

[0068] Example 5 provides a method for preparing an antibacterial polyolefin film containing olive leaf extract, comprising the following steps:

[0069] Dissolve 1 kg of olive leaf extract in Example 3 in 9 kg of 90% mass concentration ethanol solution to obtain a coating solution, first coat the coating solution on a polyolefin film with a thickness of 20 μm, then perform a first drying, then perform a second coating on the coating layer, and then perform a second drying to form an antibacterial coating layer with a thickness of 10 μm, thereby obtaining an antibacterial polyolefin film containing olive leaf extract; wherein the first drying step is: first drying at 60°C for 45 s, and then drying at 45°C for 3 min; the second drying step is: first drying at 60°C for 60 s, and then drying at 45°C for 4 min.

[0070] Application Example 1

[0071] Application Example 1 provides a method for preparing a sanitary napkin, comprising the following steps:

[0072] The surface layer, the core layer, and the bottom layer are sequentially compounded to obtain a sanitary napkin; wherein the surface layer is a cotton-soft non-woven fabric; the core layer is an absorbent core; the bottom layer is the antibacterial polyolefin film in Example 1, and the antibacterial coating layer on the antibacterial polyolefin film is attached to the core layer.

[0073] Application Example 2

[0074] Application Example 2 provides a method for preparing a sanitary napkin, comprising the following steps:

[0075] The surface layer, the core layer, and the bottom layer are sequentially compounded to obtain a sanitary napkin; wherein the surface layer is a cotton-soft non-woven fabric; the core layer is an absorbent core; the bottom layer is the antibacterial polyolefin film in Example 2, and the antibacterial coating layer on the antibacterial polyolefin film is attached to the core layer.

[0076] Application Example 3

[0077] Application Example 3 provides a method for preparing a sanitary napkin, comprising the following steps:

[0078] The surface layer, the core layer and the bottom layer are sequentially compounded to obtain a sanitary napkin; wherein the surface layer is a cotton-soft non-woven fabric; the core layer is an absorbent core; the bottom layer is the antibacterial polyolefin film in Embodiment 3, and the antibacterial coating on the antibacterial polyolefin film is attached to the core layer.

[0079] Application Example 4

[0080] Application Example 4 provides a preparation method of a sanitary napkin, comprising the following steps:

[0081] The surface layer, the core layer and the bottom layer are sequentially compounded to obtain a sanitary napkin; wherein the surface layer is a cotton-soft non-woven fabric; the core layer is an absorbent core; the bottom layer is the antibacterial polyolefin film in Embodiment 4, and the antibacterial coating on the antibacterial polyolefin film is attached to the core layer.

[0082] Application Example 5

[0083] Application Example 5 provides a preparation method of a sanitary napkin, comprising the following steps:

[0084] The surface layer, the core layer and the bottom layer are sequentially compounded to obtain a sanitary napkin; wherein the surface layer is a cotton-soft non-woven fabric; the core layer is an absorbent core; the bottom layer is the antibacterial polyolefin film in Embodiment 5, and the antibacterial coating on the antibacterial polyolefin film is attached to the core layer.

[0085] Comparative Application Example 1

[0086] Comparative Application Example 1 provides a preparation method of a sanitary napkin, comprising the following steps:

[0087] 0.8 kg of olive leaf extraction powder, 0.9 kg of water and 7.9 kg of propylene glycol are stirred and heated to 45℃, and after being uniformly mixed, an antibacterial liquid is obtained; the spunlace non-woven fabric is soaked in the antibacterial liquid at 28℃ for 15 min, and then dried to obtain an antibacterial layer; the surface layer, the antibacterial layer, the core layer and the bottom layer are sequentially compounded to obtain a sanitary napkin; wherein the surface layer is a cotton-soft non-woven fabric; the core layer is an absorbent core; the bottom layer is a polyolefin film with a thickness of 20 μm.

[0088] Performance detection test

[0089] Preparation of bacterial suspension: fresh slant culture of test bacteria Escherichia coli for 24 hours is washed with phosphate buffer and diluted to about 10 5 ~10 6 CFU / mL;

[0090] Sample treatment: the sanitary napkin is cut into 20 mm x 30 mm samples with sterilized scissors, and then 0.1 ml of drop solution with pH = 7.1 is added to the surface layer of the sample, and the control sample needs to be treated by pressure steam sterilization; wherein the drop solution is a sodium bicarbonate aqueous solution with pH = 9.0, and then carbon dioxide is introduced to adjust the pH to 7.1;

[0091] Bacteria and contact: in a sterile plate, 0.1 mL of bacterial suspension was added to each sample piece, which was placed in a 20℃ water bath for 5 minutes to allow the bacterial solution to fully contact the sample piece;

[0092] Elution and culture: after contacting for a specified time, the sample piece was placed in a 5.0 mL PBS test tube and shaken to elute, 1.0 mL of the sample solution was inoculated on a plate and cultured at 36℃ for 48 hours; then the bacteriostatic rate was calculated by colony counting method.

[0093] Table 1 Performance test results of sanitary napkins

[0094] Sample Bacteriostatic rate (%) Application Example 1 71.0 Application Example 2 71.8 Application Example 3 72.0 Application Example 4 73.2 Application Example 5 72.5 Comparative Application Example 1 63.2

[0095] In combination with application example 1 and comparative application example 1, the bacteriostatic effect of the sanitary napkin in application example 1 is better, and it can be seen that the sanitary napkin prepared by using the bacteriostatic polyolefin film in the present application has good bacteriostatic performance.

[0096] In combination with application examples 1-3, it can be seen that when preparing the bacteriostatic polyolefin film, the bacteriostatic polyolefin film prepared according to the raw material ratio and parameters in examples 1-3 has good bacteriostatic performance.

[0097] In combination with application example 2, application example 4 and application example 5, the bacteriostatic effect of the sanitary napkin in application example 4 is the best, and it can be seen that when preparing the olive leaf extract, the preparation conditions in preparation example 2 are the best, so that the bacteriostatic effect of the olive leaf extract obtained is the best.

[0098] The sanitary napkin in application example 4 was cut into 20mm×30mm sample pieces with sterilized scissors, then 0.1ml of the drop solution was added to the surface layer of different sample pieces, and the pH of the drop solution was 4.3, 6.8, 7.4 and 8.5 respectively, the pH of the drop solution was adjusted by changing the amount of carbon dioxide introduced into the sodium bicarbonate aqueous solution with pH=9.0, then the bacteriostatic performance test was carried out again, and the bacteriostatic rate was calculated.

[0099] Table 2 Bacteriostatic performance test results under different pH

[0100] Sample Bacteriostatic rate (%) pH = 4.3 55.2 pH = 6.8 72.8 pH = 7.1 73.2 pH = 7.4 73.1 pH = 8.5 63.7

[0101] In combination with table 2, it can be seen that under the condition of pH=6.8-7.4, the active ingredients in the olive leaf extract in the sanitary napkin in the present application are released, so that the bacteriostatic effect of the sanitary napkin is better.

[0102] This specific embodiment is only an explanation of the present application, and is not a limitation of the present application. Those skilled in the art can make modifications to the present embodiment without creative contribution after reading the present specification, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. An antibacterial polyolefin film containing olive leaf extract, characterized in that: Includes a polyolefin film and an antibacterial coating disposed on the polyolefin film; The raw materials for the antibacterial coating include 8-12 parts of olive leaf extract and 88-92 parts of ethanol solution. The preparation method of the olive leaf extract includes the following steps: raw material pretreatment: soaking olive leaves in a 0.85%-0.9% saline solution for 1-2 hours, then rinsing with clean water, and then crushing them into olive microparticles with a particle size of 1-3 mm; enzymatic hydrolysis: adding water to the olive microparticles, then adding an enzyme treatment agent, and enzymatically hydrolyzing at a constant temperature of 40-60℃ for 3-6 hours to obtain an enzymatic hydrolysate; the enzyme treatment agent includes a mixture of cellulase and acidic pectinase; the weight ratio of cellulase to acidic pectinase in the enzyme treatment agent is 3:1; the weight ratio of the enzyme treatment agent to the olive microparticles is (0.3-1.5):100; ultrasonic treatment: placing the enzymatic hydrolysate in an ultrasonic extractor and ultrasonically treating it to obtain a treated solution. Filtration: The liquid is filtered using a filter membrane with a pore size of 0.1-0.45 μm to remove macromolecular impurities and residues, resulting in a crude extract. Refining: 0.8 mol / L sulfuric acid solution is added to the crude extract to adjust the pH to 3-4. Then, an aqueous ethanol solution is added, and the mixture is stirred until homogeneous. The mixture is allowed to stand and separate into layers. The organic phase is concentrated under reduced pressure at 40-50℃ to one-tenth of its original volume, yielding the olive leaf extract.

2. A method for preparing an antibacterial polyolefin film containing olive leaf extract as described in claim 1, characterized in that: Includes the following steps: Olive leaf extract is dissolved in an ethanol solution to obtain a coating solution. The coating solution is first coated onto a polyolefin film, then dried once. Next, a second coating is applied to the coating layer, followed by a second drying to form an antibacterial coating, thus obtaining an antibacterial polyolefin film containing olive leaf extract.

3. The method for preparing an antibacterial polyolefin film containing olive leaf extract according to claim 2, characterized in that: The thickness of the antibacterial coating is 5-15 μm.

4. The method for preparing an antibacterial polyolefin film containing olive leaf extract according to claim 3, characterized in that: The first drying step is as follows: first dry at 60℃ for 40-50 seconds, then dry at 45℃ for 2.5-3.5 minutes; the second drying step is as follows: first dry at 60℃ for 50-70 seconds, then dry at 45℃ for 3.5-4.5 minutes.

5. A sanitary napkin, characterized in that: It includes a top layer, a core layer and a bottom layer arranged in sequence, wherein the bottom layer includes an antibacterial polyolefin film containing olive leaf extract as described in claim 1, and the antibacterial coating on the antibacterial polyolefin film containing olive leaf extract is bonded to the core layer.