A sanitary napkin which can further store exuding liquid and a method for producing the same

Abstract

The application discloses a sanitary napkin capable of further storing leaked liquid and a production method thereof. The sanitary napkin comprises a bottom film, a core and a surface layer. The core is installed on the bottom film, and the surface layer is bonded to the bottom film. The core is provided with a plurality of connecting holes. Connecting cavities are formed between the bottom film and the core and are communicated with the connecting holes. The core is fixedly provided with a connecting part which extends away from the core. The connecting part is provided with a flow guiding hole. The sanitary napkin has the effect of improving the liquid storage capacity.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sanitary napkins, in particular to a sanitary napkin capable of further storing leaked liquid and a production method thereof. BACKGROUND

[0002] A sanitary napkin is a liquid-absorbing material and is a female-specific nursing product. The sanitary napkin mainly absorbs liquid through cotton-like pulp and a water-absorbing core, so that the liquid discharged from the vagina is absorbed by the water-absorbing core when a woman has her period, so as to prevent clothes from being stained. The surface layer and the core of the sanitary napkin are directly in contact with the human body to absorb liquid.

[0003] The surface layer of the existing ordinary sanitary napkin in contact with the human body is mostly made of ordinary fabrics such as synthetic fibers and non-woven fabrics. Due to the limited speed of the surface layer fabric and the core in absorbing liquid, the menstrual blood spreads on the surface layer of the sanitary napkin and stays there for a long time, so that the woman often has symptoms such as stuffy and itchy when using the sanitary napkin. The liquid storage effect and comfort of the sanitary napkin are poor, and the absorption core is easily squeezed to cause reverse seepage and liquid leakage. SUMMARY

[0004] In order to improve the liquid storage effect of the sanitary napkin, the present application provides a sanitary napkin capable of further storing leaked liquid and a production method thereof.

[0005] In a first aspect, the present application provides a sanitary napkin capable of further storing leaked liquid, which adopts the following technical solution: a sanitary napkin capable of further storing leaked liquid, comprising a bottom film, a core and a surface layer; the core is installed on the bottom film, the surface layer is bonded to the bottom film, the core is provided with a plurality of connecting holes, a connecting cavity is formed between the bottom film and the core, the connecting cavity is in communication with the connecting holes, the core is fixedly installed with a connecting part, the connecting part extends away from the core, and a flow guide hole is formed in the connecting part.

[0006] Through the above technical solution, when the user uses the sanitary napkin, the liquid passes through the surface layer and enters the core, the core absorbs part of the liquid, and another part of the liquid enters the connecting cavity through the connecting hole, the connecting cavity stores the liquid, so that the liquid is not easy to leak out; when the user lies down or sits down, at this time, the horizontal height of the end of the core away from the connecting part is higher than the horizontal height of the end of the connecting part away from the core, the liquid is easy to penetrate to the end of the connecting part away from the core, and the flow guide hole can guide the liquid to the connecting cavity; after the liquid flows into the connecting cavity, the liquid flows in the connecting cavity and penetrates into the core which is not wetted, effectively reducing the reverse seepage effect of the liquid, so that the liquid is not easy to pass through the surface layer, and the dryness of the surface layer is maintained.

[0007] Preferably, the cross section of the flow guide hole is arc-shaped, and the inner arc surface of the flow guide hole is close to the core body; the flow guide hole is provided with a plurality of flow guide holes, and the plurality of flow guide holes are arranged at intervals along the length direction of the connecting portion.

[0008] By adopting the above technical scheme, in the process of using the sanitary napkin, the plurality of flow guide holes with arc-shaped cross sections abut against the buttocks, so that the position of the connecting portion at the flow guide hole can better fit the buttocks of the user.

[0009] Preferably, the intervals between the plurality of flow guide holes gradually increase, and the arc lengths of the plurality of flow guide holes gradually increase.

[0010] By adopting the above technical scheme, the distances and arc lengths of the flow guide holes are different, which can increase the flow guide effect, increase the contact area between the buttocks of the user and the core body, and thus the liquid absorption effect of the core body is better.

[0011] Preferably, the surface layer is fixedly connected with a barrier portion along the length direction, the barrier portion is located on both sides of the surface layer, and the two barrier portions are oppositely arranged.

[0012] By adopting the above technical scheme, when the user uses the sanitary napkin, the barrier portion makes the sanitary napkin have a three-dimensional shape, the barrier portion and the surface layer away from the core body form a frame, and thus the side leakage of the liquid is better reduced.

[0013] Preferably, the bottom film is a casting film, and the casting film is made of the following raw materials by weight: polybutylene adipate terephthalate 60-80 parts; polylactic acid 10-20 parts; modified lignin 20-30 parts; coupling agent 2-5 parts; antioxidant 2-4 parts; and the modified lignin is made of lignin, ethyl acetate and isocyanate.

[0014] By adopting the above technical scheme, the polybutylene adipate terephthalate has good flexibility, the modified lignin is used as a filler, the coupling agent makes the modified lignin well compatible with the polybutylene adipate terephthalate and the polylactic acid, and the coupling agent also forms a chelate with the lignin, improves the dispersibility and compatibility in the components, and improves the toughening effect of the casting film. The casting film has good flexibility and stable rigidity by the cooperation of the polybutylene adipate terephthalate, the polylactic acid and the modified lignin, so that the casting film can well store the liquid in the sanitary napkin, the liquid is not easy to leak out, and the casting film also has excellent mechanical properties.

[0015] Preferably, the preparation method of the modified lignin comprises the following steps: mixing 30-40 parts by weight of lignin with hydrogen peroxide, adding 5-10 parts by weight of dilute hydrochloric acid and 2-6 parts by weight of a catalyst, and then microwave heating, filtering, washing, drying, and crushing to obtain pretreated lignin; mixing the pretreated lignin with 10-20 parts by weight of ethyl acetate and stirring, then adding 10-20 parts by weight of isocyanate, homogenously dispersing, and ultrasonicating to obtain the modified lignin.

[0016] By adopting the technical scheme, the lignin is modified, the lignin has high impact strength, the isocyanate groups react with the -OH bonds on the surface of the lignin to form stable chemical bonds, the content of hydroxyl groups is increased after microwave heating of the isocyanate, the reactivity of the lignin and the isocyanate groups is improved, the isocyanate groups and ester groups are dispersed on the surface of the lignin, and the hydrogen bonds between the hydroxyl groups are reduced after microwave heating and drying of the lignin, thereby reducing the agglomeration of the lignin itself, improving the adhesion of the lignin, improving the compatibility of the lignin with the polybutylene adipate terephthalate and the polylactic acid, and improving the mechanical properties of the lignin.

[0017] Preferably, the isocyanate is one of isophorone diisocyanate, toluene diisocyanate, and hexamethylene diisocyanate.

[0018] By adopting the technical scheme, the lignin with good reactivity can be prepared by selecting a suitable isocyanate, thereby improving the adhesion of the lignin, improving the adhesion between the base film and the surface layer, and reducing the leakage of liquid from the connecting bin.

[0019] Preferably, the coupling agent comprises one or more of a silane coupling agent and an aluminate coupling agent.

[0020] By adopting the technical scheme, the tensile strength of the cast film can be effectively improved by selecting a suitable coupling agent, so that the liquid is not easy to leak out of the connecting bin.

[0021] Preferably, the preparation method of the cast film comprises the following steps: uniformly mixing polybutylene adipate terephthalate, polylactic acid, modified lignin, a coupling agent, and an antioxidant, granulating, drying, and casting to obtain the cast film.

[0022] By adopting the technical scheme, the cast film with good flexibility can be prepared by adopting the above method, so that the liquid can be further stored in the connecting bin and is not easy to leak out.

[0023] In a second aspect, the application provides a production method of a sanitary napkin capable of further storing leaked liquid.

[0024] The application discloses a production method of a sanitary napkin capable of further storing leaked liquid, and comprises the following steps: placing and adhering a core on a surface layer; wrapping a bottom film on the side of the core away from the surface layer, and adhering the edge position of the bottom film to the surface layer; and compacting and cutting to form the sanitary napkin.

[0025] By adopting the technical scheme, the sanitary napkin is not prone to liquid leakage.

[0026] To sum up, the application has the following beneficial technical effects:

[0027] 1. When a user uses the sanitary napkin, liquid passes through the surface layer and enters the core, the core absorbs part of the liquid, and the other part of the liquid enters the connecting cavity through the connecting hole, the connecting cavity stores the liquid, so that the liquid is not prone to leakage; when the user lies or sits, at this time, the horizontal height of the side of the core away from the connecting part is higher than the horizontal height of the side of the connecting part away from the core, the liquid is easy to penetrate towards the side of the connecting part away from the core, and the flow guide hole can guide the liquid to the connecting cavity; after the liquid flows into the connecting cavity, the liquid flows in the connecting cavity and penetrates into the core which is not permeable to moisture, so that the reverse penetration effect of the liquid is effectively reduced, thereby the liquid is not easy to pass through the surface layer, and the dryness of the surface layer is maintained.

[0028] 2. In the process of using the sanitary napkin, the plurality of flow guide holes with arc-shaped cross sections abut against buttocks, so that the position of the connecting part located at the flow guide hole can better fit the buttocks of the user; the distance and the arc length between the flow guide holes are different, so that the flow guide effect is increased, the contact area between the buttocks of the user and the core is increased, and the liquid absorption effect of the core is better.

[0029] 3. The polybutylene adipate terephthalate has good flexibility, the modified lignin is used as a filler, the coupling agent makes the modified lignin, the polybutylene adipate terephthalate and the polylactic acid well compatible, meanwhile, the coupling agent also forms a chelate with the lignin, improves the dispersibility and the compatibility in the components, and improves the toughening effect of the cast film; the polybutylene adipate terephthalate, the polylactic acid and the modified lignin are cooperated together, so that the cast film has good flexibility, and also has stable rigidity, so that the cast film can well store the liquid in the sanitary napkin, the liquid is not prone to leakage, and the cast film also has excellent mechanical properties. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a schematic view of the overall structure of an embodiment of the application.

[0031] Figure 2 is another view of the overall structure of an embodiment of the application.

[0032] Figure 3 is a structural sectional view of an embodiment of the application.

[0033] BRIEF DESCRIPTION OF DRAWINGS

[0034] 1, surface layer; 11, side wing; 12, barrier part; 2, core; 21, connecting hole; 22, connecting part; 221, flow guide hole; 3, bottom film; 31, connecting cavity. DETAILED DESCRIPTION

[0035] The following will be described in detail in combination with the accompanying drawings Figures 1-3 The application is further described in detail.

[0036] Example 1

[0037] A sanitary napkin capable of further storing leaked liquid, referring to Figure 1 The sanitary napkin comprises a bottom film 3, a core 2 and a surface layer 1 in sequence, the surface layer 1 is a non-woven fabric, the edge position of the surface layer 1 is attached to the bottom film 3, the opposite two sides of the surface layer 1 are provided with side wings 11, the two side wings 11 are oppositely arranged, the core 2 is located between the bottom film 3 and the surface layer 1, the core 2 is a foam core 2, referring to Figure 2 and Figure 3 The core 2 is installed on the bottom film 3, the core 2 and the bottom film 3 form a connecting cavity 31, the connecting cavity 31 can store liquid, so that the liquid is not easy to leak; a plurality of connecting holes 21 are formed on the core 2, the connecting holes 21 are circular holes in the embodiment of the application, the distance between adjacent two connecting holes 21 is the same, the plurality of connecting holes 21 are arranged at intervals, the connecting holes 21 are communicated with the connecting cavity 31, the liquid passes through the connecting holes 21 of the core 2 into the connecting cavity 31 after passing through the surface layer 1, so as to store the liquid and reduce the phenomenon of liquid leakage.

[0038] Referring to Figure 2 One end of the core 2 is fixedly installed with a connecting part 22, the connecting part 22 extends away from the one end of the core 2, the connecting part 22 and the core 2 are made of the same material, the one end of the connecting part 22 and the core 2 away from each other is arranged as an arc shape; a plurality of flow guide holes 221 are formed on the connecting part 22, the plurality of flow guide holes 221 are arranged from the one end close to the core 2 to the one end away from the core 2, the distance between adjacent two flow guide holes 221 gradually increases, the cross section of the flow guide hole 221 is an arc shape, so that the position of the connecting part 22 located in the flow guide hole 221 can better fit the user's buttocks; the inner arc surface of the flow guide hole 221 is close to the core 2, the arc length of the flow guide hole 221 close to the core 2 is smaller than that of the flow guide hole 221 away from the core 2, the flow guide effect is increased, the contact area between the user's buttocks and the core 2 is increased, so that the liquid absorption effect of the core 2 is better.

[0039] Referring to Figure 1The two barrier portions 12 are made of non-woven fabric and are bonded to opposite sides of the surface layer 1 along the length direction. The barrier portions 12 have a height of 0.8 cm and a length of 23 cm. When the sanitary napkin is used by a user, the barrier portions 12 make the sanitary napkin have a three-dimensional shape, and the barrier portions 12 and the side of the surface layer 1 away from the core 2 form a frame, thereby better reducing the side leakage of the liquid.

[0040] A production method of the sanitary napkin capable of further storing leaked liquid includes the following steps: placing the core 2 on the surface layer 1; placing the bottom film 3 on the side of the core 2 away from the surface layer 1, so that the bottom film 3 covers the core 2; and using an adhesive machine to bond the edge positions of the bottom film 3 and the surface layer 1, and then using a compactor and a cutting machine to compact and cut to form the sanitary napkin.

[0041] The bottom film in the embodiment is a commercially available cast film.

[0042] Embodiment 2

[0043] A production method of the sanitary napkin capable of further storing leaked liquid includes the following steps: placing 60 kg of polybutylene adipate terephthalate, 10 kg of polylactic acid, 20 kg of modified lignin, 2 kg of silane coupling agent KH550 and 2 kg of antioxidant 1010 into a high-speed stirrer and mixing uniformly for 2 min, and then placing them into a double-screw extruder for granulation, wherein the temperature is set to 150 ℃ and the rotation speed is 120 r / min; after the granulation is completed, the granules are placed into a forced air oven and dried at a temperature of 75 ℃ for 8 h, and then placed into a cast film testing machine for sample casting, wherein the temperature is 150 ℃ and the rotation speed is 20 r / min, to obtain a cast film.

[0044] The polybutylene adipate terephthalate is A400 from Zhuhai Wantong Chemical Co., Ltd., and the polylactic acid is REVODE101 from Haizheng Bio.

[0045] The preparation method of the modified lignin includes the following steps: mixing 30 kg of lignin with 20 kg of hydrogen peroxide, adding 5 kg of dilute hydrochloric acid and 2 kg of ferric sulfate catalyst, and then placing them in a microwave device for microwave heating at a temperature of 70 ℃ for 3 h, and then filtering, washing, drying and crushing to obtain pretreated lignin; homogeneously dispersing the pretreated lignin with 10 kg of ethyl acetate for 5 min, then adding 10 kg of isophorone diisocyanate and homogeneously dispersing, and then ultrasonicating for 15 min to obtain the modified lignin.

[0046] Embodiment 3

[0047] A production method of a sanitary napkin capable of further storing leaked liquid, different from example 2, is that the base film is a cast film, wherein the preparation method of the cast film is: 80 kg of polybutylene adipate terephthalate, 20 kg of polylactic acid, 30 kg of modified lignin, 5 kg of silane coupling agent KH550 and 4 kg of antioxidant 1010 are put into a high-speed mixer and mixed uniformly for 2 min, and then put into a double-screw extruder for granulation, wherein the temperature is set to 150°C and the rotation speed is 120 r / min; after granulation, the granules are placed in a forced air oven and dried at a temperature of 75°C for 8 h, and after drying, they are put into a cast film testing machine for casting, wherein the temperature is 150°C and the rotation speed is 20 r / min, to obtain a cast film.

[0048] The preparation method of the modified lignin is: 30 kg of lignin is mixed with 20 kg of hydrogen peroxide, 5 kg of dilute hydrochloric acid and 2 kg of ferric sulfate heptahydrate catalyst are added, and then placed in a microwave device, heated under a microwave at a temperature of 70°C for 3 h, filtered, washed, dried and crushed to obtain pretreated lignin; the pretreated lignin is homogeneously dispersed with 10 kg of ethyl acetate for 5 min, then 10 kg of isophorone diisocyanate is added and homogeneously dispersed, and then ultrasonic is performed for 15 min to obtain modified lignin.

[0049] Example 4

[0050] A production method of a sanitary napkin capable of further storing leaked liquid, different from example 2, is that the base film is a cast film, wherein the preparation method of the cast film is: 70 kg of polybutylene adipate terephthalate, 15 kg of polylactic acid, 25 kg of modified lignin, 3.5 kg of silane coupling agent KH550 and 3 kg of antioxidant 1010 are put into a high-speed mixer and mixed uniformly for 2 min, and then put into a double-screw extruder for granulation, wherein the temperature is set to 150°C and the rotation speed is 120 r / min; after granulation, the granules are placed in a forced air oven and dried at a temperature of 75°C for 8 h, and after drying, they are put into a cast film testing machine for casting, wherein the temperature is 150°C and the rotation speed is 20 r / min, to obtain a cast film.

[0051] The preparation method of the modified lignin is: 30 kg of lignin is mixed with 20 kg of hydrogen peroxide, 5 kg of dilute hydrochloric acid and 2 kg of ferric sulfate heptahydrate catalyst are added, and then placed in a microwave device, heated under a microwave at a temperature of 70°C for 3 h, filtered, washed, dried and crushed to obtain pretreated lignin; the pretreated lignin is homogeneously dispersed with 10 kg of ethyl acetate for 5 min, then 10 kg of isophorone diisocyanate is added and homogeneously dispersed, and then ultrasonic is performed for 15 min to obtain modified lignin.

[0052] Example 5

[0053] A production method of a sanitary napkin capable of further storing leaked liquid, which is different from Example 4 in that the preparation method of the modified lignin is as follows: 40 kg of lignin is mixed with 40 kg of hydrogen peroxide, 10 kg of dilute hydrochloric acid and 6 kg of iron sulfate heptahydrate catalyst are added, and then placed in a microwave device, heated by microwave at a temperature of 70°C for 3 h, filtered, washed, dried, and crushed to obtain pretreated lignin; the pretreated lignin is homogeneously dispersed with 20 kg of ethyl acetate for 5 min, and then homogeneously dispersed with 20 kg of isophorone diisocyanate, and ultrasonically treated for 15 min to obtain modified lignin.

[0054] Example 6

[0055] A production method of a sanitary napkin capable of further storing leaked liquid, which is different from Example 4 in that the modified lignin is replaced with commercially available lignin in equal amount.

[0056] Example 7

[0057] A production method of a sanitary napkin capable of further storing leaked liquid, which is different from Example 4 in that silane coupling agent KH550 is selected when preparing the casting film, and toluene diisocyanate is used instead of isophorone diisocyanate when preparing the modified lignin.

[0058] Example 8

[0059] A production method of a sanitary napkin capable of further storing leaked liquid, which is different from Example 4 in that aluminate coupling agent DL-411 is selected when preparing the casting film, and hexamethylene diisocyanate is used instead of isophorone diisocyanate when preparing the modified lignin.

[0060] Example 9

[0061] A production method of a sanitary napkin capable of further storing leaked liquid, which is different from Example 4 in that 2 kg of silane coupling agent KH550 and 1.5 kg of aluminate coupling agent DL-411 are selected when preparing the casting film, and hexamethylene diisocyanate is used as the isocyanate when preparing the modified lignin.

[0062] Example 10

[0063] A production method of a sanitary napkin capable of further storing leaked liquid, which is different from Example 4 in that 0.5 kg of silane coupling agent KH550 and 3 kg of aluminate coupling agent DL-411 are selected when preparing the casting film, and isophorone diisocyanate is used as the isocyanate when preparing the modified lignin.

[0064] Comparative Example

[0065] Comparative Example 1

[0066] A production method of sanitary napkins capable of further storing leaked liquid, which is different from Example 2 in that modified lignin is replaced by mica powder in equal amount.

[0067] Comparative Example 2

[0068] A production method of sanitary napkins capable of further storing leaked liquid, which is different from Example 2 in that polylactic acid is replaced by polystyrene in equal amount.

[0069] Comparative Example 3

[0070] A production method of sanitary napkins capable of further storing leaked liquid, which is different from Example 2 in that polylactic acid is replaced by polypropylene in equal amount and modified lignin is replaced by talc powder in equal amount.

[0071] Comparative Example 4

[0072] A production method of sanitary napkins capable of further storing leaked liquid, which is different from Example 2 in that polybutylene adipate terephthalate is replaced by polybutylene succinate adipate in equal amount.

[0073] Performance detection test:

[0074] Tensile strength: The bottom film of Examples 1-10 and Comparative Examples 1-4 was tested according to GB / T1040.3-2006.

[0075] Elongation at break: The bottom film of Examples 1-10 and Comparative Examples 1-4 was tested according to QB / T1130-1991.

[0076] Water vapor permeability: The bottom film of Examples 1-10 and Comparative Examples 1-4 was tested according to GB / T 1037 "Plastic film and sheet water vapor permeability test method cup method".

[0077]

[0078]

[0079] According to the comparison of the data of Examples 1-4 and Comparative Examples 1-4, it can be obtained that the cast film has good flexibility by the cooperation of polybutylene adipate terephthalate, polylactic acid and modified lignin, and also has stable rigidity, so that the cast film can well store liquid in the sanitary napkin, the liquid is not easy to leak, and the cast film also has excellent mechanical properties.

[0080] According to the data comparison of embodiments 4-6, by modifying the lignin, reducing the agglomeration of lignin itself, improving the adhesion of lignin, improving the compatibility between lignin and polybutylene adipate terephthalate and polylactic acid, and improving the mechanical properties of lignin.

[0081] According to the data comparison of embodiments 3 and 7-10, by selecting appropriate isocyanate, lignin with good reactivity can be prepared, thereby improving the adhesion of lignin, and further improving the adhesion between the base film and the surface layer, reducing the liquid leakage from the connecting bin; by selecting appropriate coupling agent, the tensile strength of the casting film can be effectively improved, so that the liquid is not easy to leak from the connecting bin.

[0082] The specific embodiments are only an explanation of the present application, and are not a limitation of the present application. Those skilled in the art can make modifications to the present embodiments without creative contribution after reading the present specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A sanitary napkin capable of further storing exuding liquids, characterized in that: The application relates to a sanitary napkin capable of further storing exuded liquid, which comprises a bottom film (3), a core (2) and a surface layer (1); the core (2) is installed on the bottom film (3), the surface layer (1) is bonded to the bottom film (3), the core (2) is provided with a plurality of connecting holes (21), connecting cavities (31) are formed between the bottom film (3) and the core (2), the connecting cavities (31) are communicated with the connecting holes (21), the core (2) is fixedly provided with a connecting portion (22), the connecting portion (22) extends away from the core (2), and flow guiding holes (221) are formed in the connecting portion (22). The cross section of the flow guiding hole (221) is arc-shaped, the inner arc surface of the flow guiding hole (221) is close to the core (2), a plurality of the flow guiding holes (221) are arranged along the length direction of the connecting portion (22), the intervals between the plurality of flow guiding holes (221) gradually increase, and the arc lengths of the plurality of flow guiding holes (221) gradually increase. The bottom film (3) is a casting film which is prepared from the following raw materials in parts by weight: polybutylene adipate terephthalate 60-80 parts, polylactic acid 10-20 parts, modified lignin 20-30 parts, coupling agent 2-5 parts and antioxidant 2-4 parts; the modified lignin is prepared from lignin, ethyl acetate and isocyanate. The preparation method of the modified lignin is as follows: 30-40 parts by weight of lignin is mixed with hydrogen peroxide, 5-10 parts by weight of dilute hydrochloric acid and 2-6 parts by weight of a catalyst are added, microwave heating is conducted, and pretreated lignin is obtained after filtration, washing, drying and crushing. The pretreated lignin is mixed with 10-20 parts by weight of ethyl acetate and stirred, 10-20 parts by weight of isocyanate is added and uniformly dispersed, and ultrasonic treatment is conducted to obtain the modified lignin.

2. The sanitary napkin of claim 1 further storing the exuded liquid, wherein: The surface layer (1) is fixedly connected with barrier portions (12) along the length direction, the barrier portions (12) are located on the two sides of the surface layer (1), and the two barrier portions (12) are oppositely arranged.

3. The sanitary napkin of Claim 1 further storing exuding liquids, wherein: The isocyanate is selected from one of isophorone diisocyanate, toluene diisocyanate and hexamethylene diisocyanate.

4. The sanitary napkin of Claim 1 further storing exuding liquids, wherein: The coupling agent comprises one or more of silane coupling agent and aluminate coupling agent.

5. The sanitary napkin of Claim 1 further storing exuding liquids, wherein: The preparation method of the casting film is as follows: polybutylene adipate terephthalate, polylactic acid, modified lignin, coupling agent and antioxidant are uniformly mixed, granulation, drying and casting are conducted, and the casting film is obtained.

6. A method of producing a sanitary napkin capable of further storing exuding liquid, characterized by: The application further discloses a preparation method of the sanitary napkin capable of further storing exuded liquid.

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