阅读说明：本技术 一种三段式透气卫生巾 (Three-section type breathable sanitary towel ) 是由 黄翠玉 华莉云 李镇成 于 2021-07-30 设计创作，主要内容包括：本发明涉及一次性卫生用品领域,提供一种三段式透气卫生巾,包括卫生巾本体,所述卫生巾本体包括由上到下依次叠层设置的透液性表层、导流层、吸收芯体、透气底层,所述透气底层包括第一透气区,所述第一透气区的横向两侧分别设有第二透气区和第三透气区,所述第一透气区与第二透气区部分重叠形成第一连接区,所述第一透气区与第三透气区部分重叠形成第二连接区,所述第一透气区为PE透气膜,所述第二透气区和第三透气区为纳米纤维复合膜,所述纳米纤维复合膜由改性纳米纤维膜和改性纳米纤维膜底部的无纺布复合而成。本发明制备的卫生巾解决了现有卫生巾透气性不佳的问题,同时还具有良好的防水性、抗菌性。(The invention relates to the field of disposable sanitary products, and provides a three-section type breathable sanitary towel which comprises a sanitary towel body, wherein the sanitary towel body comprises a liquid-permeable surface layer, a flow guide layer, an absorption core body and a breathable bottom layer which are sequentially stacked from top to bottom, the breathable bottom layer comprises a first breathable area, a second breathable area and a third breathable area are respectively arranged on two transverse sides of the first breathable area, the first breathable area and the second breathable area are partially overlapped to form a first connecting area, the first breathable area and the third breathable area are partially overlapped to form a second connecting area, the first breathable area is a PE breathable film, the second breathable area and the third breathable area are nanofiber composite films, and the nanofiber composite films are formed by compounding modified nanofiber films and non-woven fabrics at the bottoms of the modified nanofiber films. The sanitary towel prepared by the invention solves the problem of poor air permeability of the existing sanitary towel, and has good waterproofness and antibacterial property.)

1. The utility model provides a syllogic ventilative sanitary towel, includes the sanitary towel body, and what the definition extended along sanitary towel body length direction is vertical, and what extended along sanitary towel body width direction is horizontal, its characterized in that: the sanitary napkin comprises a sanitary napkin body and is characterized in that wings are arranged on two transverse sides of the sanitary napkin body, the sanitary napkin body comprises a liquid-permeable surface layer, a flow guide layer, an absorption core body and a breathable bottom layer which are sequentially arranged from top to bottom in a laminated manner, the breathable bottom layer comprises a first breathable area, a second breathable area and a third breathable area are respectively arranged on two transverse sides of the first breathable area, the first breathable area and the second breathable area are partially overlapped and connected to form a first connecting area, the first breathable area and the third breathable area are partially overlapped and connected to form a second connecting area, the first breathable area is a PE (polyethylene) breathable film, the second breathable area and the third breathable area are nanofiber composite films, and the nanofiber composite films are formed by compounding modified nanofiber films and non-woven fabrics at the bottoms of the modified nanofiber films.

2. A three-piece breathable sanitary napkin according to claim 1, wherein: the preparation method of the modified nanofiber membrane comprises the following steps:

(1) weighing the following raw materials in parts by weight for later use: 8-15 parts of polyurethane, 2-4 parts of bamboo fiber, 4-6 parts of modified carbon nanotube, 1-3 parts of antibacterial particles and 70-90 parts of solvent;

(2) dissolving polyurethane in a solvent, adding bamboo fibers, modified carbon nanotubes and antibacterial particles, and performing ultrasonic dispersion to obtain a spinning solution;

(3) carrying out electrostatic spinning on the spinning solution to obtain a nanofiber membrane; and (3) soaking the nanofiber membrane into a hydroxypropyl trimethyl ammonium chloride chitosan aqueous solution for 1-3h, and then drying in vacuum to obtain the modified nanofiber membrane.

3. A three-piece breathable sanitary napkin according to claim 2, wherein: the solvent is formed by mixing ethyl acetate and N, N-dimethylformamide according to the mass ratio of 1: 1-3.

4. A three-piece breathable sanitary napkin according to claim 2, wherein: the ultrasonic power is 800-1500W, and the time is 20-40 min.

5. A three-piece breathable sanitary napkin according to claim 2, wherein: the concentration of the hydroxypropyl trimethyl ammonium chloride chitosan aqueous solution is 10-18 wt%.

6. A three-piece breathable sanitary napkin according to claim 2, wherein: and performing alkali treatment before mixing the bamboo fibers.

7. A three-piece breathable sanitary napkin according to claim 2, wherein: the modified carbon nano tube is prepared by the following steps:

a. adding carbon nano tubes, allylamine and anhydrous ferric trichloride into N, N-dimethylformamide, uniformly mixing, reacting at 60-90 ℃ for 8-15h, and performing suction filtration, washing and drying after the reaction is finished to obtain an intermediate;

b. adding the intermediate into a methanol solution of heptadecafluorodecyltripropoxysilane with the concentration of 10 wt%, stirring and reacting for 2-4h at the temperature of 100-120 ℃, and performing suction filtration, washing and drying after the reaction is finished to obtain the modified carbon nano tube.

8. A three-piece breathable sanitary napkin according to claim 7, wherein: the mass ratio of the carbon nano tube to the allylamine to the anhydrous ferric chloride is 1: 6-10: 2-4.

9. A three-piece breathable sanitary napkin according to claim 7, wherein: the mass ratio of the intermediate to the heptadecafluorodecyltripropoxysilane is 1: 1.8-2.5.

10. A three-piece breathable sanitary napkin according to claim 1, wherein: the width of the first and second connection areas is 5-10 mm.

Technical Field

The invention relates to the field of disposable sanitary products, in particular to a three-section type breathable sanitary towel.

Background

The sanitary towel is a necessity for female life, and can keep menstrual blood flowing out of the vagina in the sanitary towel when the female has a wet menstrual period, so that the embarrassment of dirtying trousers is avoided. Chinese patent application No.: 202020515078.8 discloses an ultrathin dry bamboo fiber sanitary napkin, which comprises a hydrophilic surface layer, a flow guide layer, an absorption layer and a breathable leakproof bottom layer from top to bottom in sequence, wherein the hydrophilic surface layer is composed of an upper polylactic acid fiber layer and a lower bamboo fiber layer; the flow guide layer is a chemically bonded non-woven fabric; the absorption layer is formed by wrapping water absorption paper by melt-blown cloth, and the water absorption paper is provided with a diversion trench formed by a plurality of pressing trenches; the breathable and leak-proof bottom layer is a PE breathable film. The face layer of the sanitary napkin adopts double carding technology, polylactic acid fiber is skin-friendly, soft and low in friction, bamboo fiber quickly draws liquid, and the sanitary napkin has antibacterial activity and prevents irritation caused by friction and bacteria at private parts; the chemical bonding flow guide layer has excellent moisture-proof flow guide effect, and can still keep dry and cool after being absorbed for many times; three pressure grooves on the absorption layer form diversion grooves, and menstrual blood quickly diffuses and permeates into the water absorption layer; the sanitary towel is more comfortable to wear when the thickness is less than 1.5 mm. Breathability is an important consideration for female consumers to choose sanitary napkins, and a sanitary napkin with good breathability can reduce the feeling of hot weather or stuffiness after long-term use. The bottom material of the sanitary towel plays a crucial role in the air permeability of the product, the air-permeable and leak-proof bottom layer of the ultrathin dry and comfortable bamboo fiber sanitary towel is a PE (polyethylene) air-permeable film which is a commonly-used bottom material in the prior art, but the air permeability of the PE air-permeable film is general, and the requirement of modern women on the increasingly high air permeability of the sanitary towel cannot be met.

Disclosure of Invention

Therefore, aiming at the above content, the invention provides a three-section type breathable sanitary towel, which solves the problem of poor breathability of the conventional sanitary towel.

In order to achieve the purpose, the invention is realized by the following technical scheme:

a three-section type breathable sanitary towel comprises a sanitary towel body, wherein the longitudinal direction extending along the length direction of the sanitary towel body is defined, the transverse direction extending along the width direction of the sanitary towel body is defined, the sanitary napkin body is provided with wings at two transverse sides, the sanitary napkin body comprises a liquid-permeable surface layer, a flow guide layer, an absorption core body and a breathable bottom layer which are sequentially laminated from top to bottom, the breathable bottom layer comprises a first breathable area, a second breathable area and a third breathable area are respectively arranged on the two transverse sides of the first breathable area, the first breathable area and the second breathable area are partially overlapped and connected to form a first connecting area, the first breathable area and the third breathable area are partially overlapped and connected to form a second connecting area, the first breathable zone is a PE breathable film, the second breathable zone and the third breathable zone are nanofiber composite films, the nanofiber composite membrane is formed by compounding a modified nanofiber membrane and non-woven fabrics at the bottom of the modified nanofiber membrane.

The further improvement is that: the preparation method of the modified nanofiber membrane comprises the following steps:

(1) weighing the following raw materials in parts by weight for later use: 8-15 parts of polyurethane, 2-4 parts of bamboo fiber, 4-6 parts of modified carbon nanotube, 1-3 parts of antibacterial particles and 70-90 parts of solvent;

(2) dissolving polyurethane in a solvent, adding bamboo fibers, modified carbon nanotubes and antibacterial particles, and performing ultrasonic dispersion to obtain a spinning solution;

(3) carrying out electrostatic spinning on the spinning solution to obtain a nanofiber membrane; and (3) soaking the nanofiber membrane into a hydroxypropyl trimethyl ammonium chloride chitosan aqueous solution for 1-3h, and then drying in vacuum to obtain the modified nanofiber membrane.

The further improvement is that: the technological parameters of electrostatic spinning are as follows: the voltage is 20-28kV, the receiving distance is 18-22cm, and the injection speed of the spinning solution is 0.9-1.2 mL/h.

The further improvement is that: the solvent is formed by mixing ethyl acetate and N, N-dimethylformamide according to the mass ratio of 1: 1-3.

The further improvement is that: the ultrasonic power is 800-.

The further improvement is that: the concentration of the hydroxypropyl trimethyl ammonium chloride chitosan aqueous solution is 10-18 wt%.

The further improvement is that: and performing alkali treatment before mixing the bamboo fibers.

The further improvement is that: the modified carbon nano tube is prepared by the following steps:

a. adding carbon nano tubes, allylamine and anhydrous ferric trichloride into N, N-dimethylformamide, uniformly mixing, reacting at 60-90 ℃ for 8-15h, and performing suction filtration, washing and drying after the reaction is finished to obtain an intermediate;

b. adding the intermediate into a methanol solution of heptadecafluorodecyltripropoxysilane with the concentration of 10 wt%, stirring and reacting for 2-4h at the temperature of 100-120 ℃, and performing suction filtration, washing and drying after the reaction is finished to obtain the modified carbon nano tube.

The further improvement is that: the mass ratio of the carbon nano tube to the allylamine to the anhydrous ferric chloride is 1: 6-10: 2-4.

The further improvement is that: the mass ratio of the intermediate to the heptadecafluorodecyltripropoxysilane is 1: 1.8-2.5.

The further improvement is that: the width of the first and second connection areas is 5-10 mm.

The further improvement is that: the width of the first breathable zone accounts for 30-40% of the total width of the breathable bottom layer.

The further improvement is that: the flow guide layer comprises an upper flow guide layer and a lower flow guide layer arranged at the bottom of the upper flow guide layer, and the upper flow guide layer is made of the following fiber raw materials in parts by mass: 25-35 wt% of hollow viscose fiber and 65-75 wt% of polypropylene fiber, wherein the lower flow guide layer is prepared from the following fiber raw materials in percentage by mass: 80-90 wt% of hollow viscose fiber and 10-20 wt% of polypropylene fiber.

By adopting the technical scheme, the invention has the beneficial effects that:

1. the electrostatic spinning technology is a spinning method which comprises the steps of applying a high-voltage electric field to a polymer solution to enable charged polymer solution or melt to flow or deform in an electrostatic field, drawing the polymer solution or melt into filaments, and then volatilizing a solvent or cooling and solidifying the melt to obtain the polymer solution or melt which is subjected to jet drawing under the electrostatic action to obtain superfine fibers. The prepared fiber has the advantages of nanometer diameter, high porosity, high fiber uniformity and the like, is beneficial to the water vapor molecules to pass but prevents water drops from passing, and can greatly improve the air permeability and the waterproofness of the sanitary towel when being applied to the leakproof bottom layer of the sanitary towel. However, considering that the cost of the nanofiber membrane is high, the bottom layer of the air permeable nanofiber membrane is designed in a three-section mode, and the nanofiber composite membrane is selected in the two side areas of the bottom layer, so that the air permeability of a product is remarkably improved on the premise that the production cost is not greatly increased.

2. The nanofiber composite membrane is formed by compounding a modified nanofiber membrane and a non-woven fabric at the bottom of the modified nanofiber membrane, wherein the modified nanofiber membrane is obtained by performing post-treatment on a hydroxypropyl trimethyl ammonium chloride chitosan aqueous solution after spinning solution electrostatic spinning, and the hydroxypropyl trimethyl ammonium chloride chitosan is a quaternary ammonium salt with good antibacterial property and film forming property, so that the modified nanofiber membrane has good antibacterial property, the bacterial breeding is prevented, and gynecological diseases such as female infectious bacteria and fungi are avoided. The spinning solution comprises the following raw materials in parts by weight: 8-15 parts of polyurethane, 2-4 parts of bamboo fiber, 4-6 parts of modified carbon nanotube, 1-3 parts of antibacterial particles and 70-90 parts of solvent. The addition of the carbon nano tube can improve the conductivity of the spinning solution, so that the spinning solution can be more easily sprayed out in a high-voltage electric field, and a nano fiber film with good uniformity is obtained; the surface grafting modification of the carbon nano tube by using the allylamine is to improve the dispersibility of the carbon nano tube; finally, the crosslinking reaction is carried out with heptadecafluorodecyltripropoxysilane, a stable polysiloxane crosslinking network structure is formed on the surface of the carbon nano tube, and hydrophobic group fluorine is introduced, without damaging the surface structure and performance of the carbon nano tube, the fluorine-containing group enhances the surface hydrophobicity of the nano fiber membrane, and the waterproofness is greatly improved. The special structure of the bamboo fiber enables the bamboo fiber to show good air permeability, and the natural antibacterial and deodorizing characteristics of the bamboo fiber enable the nano fiber membrane obtained through electrostatic spinning to be further improved in air permeability and antibacterial property and have a certain function of eliminating peculiar smell. The modified nanofiber membrane has excellent antibacterial property through the combined action of the bamboo fibers, the antibacterial particles and the hydroxypropyl trimethyl ammonium chloride chitosan. Furthermore, the bamboo fibers are subjected to alkali treatment before being mixed with other raw material components, so that the bamboo fibers can be activated, the activity of the bamboo fibers is enhanced, and the effects of the bamboo fibers are fully exerted.

3. The utility model provides a water conservancy diversion layer includes water conservancy diversion layer and the lower water conservancy diversion layer of last water conservancy diversion layer bottom, go up the water conservancy diversion and make by hydrophobic polypropylene fibre and hydrophilic cavity viscose fiber with water conservancy diversion layer down, the difference lies in the shared proportion of polypropylene fibre height in the water conservancy diversion layer, the shared proportion of cavity viscose fiber height in the water conservancy diversion layer down, utilize the difference of two-layer structure hydrophilicity, can realize that the menstrual blood oozes to shift to lower water conservancy diversion layer along going up the water conservancy diversion layer from the liquid permeability top layer fast, and the menstrual blood of water conservancy diversion layer bottom is difficult to the reverse osmosis to liquid permeability top layer down, has improved the dry and comfortable comfort level on top layer. In addition, the polypropylene fiber has a unique wicking effect, moisture is discharged through capillaries in the fiber, and when a large amount of menstrual blood is generated, the characteristics of the polypropylene fiber are utilized to rapidly transfer the menstrual blood from one side of the upper flow guide layer close to the liquid-permeable surface layer to the other side, so that the infiltration speed of the menstrual blood is improved.

Drawings

FIG. 1 is a schematic structural view of embodiment 1 of the present invention;

FIG. 2 is a schematic view showing the structure of a sanitary napkin body according to example 1;

FIG. 3 is a front view of the breathable backsheet in example 1;

figure 4 is a top view of the breathable backsheet of example 1.

Detailed Description

The following detailed description will be provided for the embodiments of the present invention with reference to specific embodiments, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented.

Unless otherwise indicated, the techniques employed in the examples are conventional and well known to those skilled in the art, and the reagents and products employed are also commercially available. The source, trade name and if necessary the constituents of the reagents used are indicated at the first appearance.

Example 1

Referring to fig. 1 to 4, a three-section breathable sanitary napkin comprises a sanitary napkin body 1, wherein the longitudinal direction extending along the length direction of the sanitary napkin body 1 is defined, the transverse direction extending along the width direction of the sanitary napkin body 1 is defined, wings 2 are arranged on two transverse sides of the sanitary napkin body, the sanitary napkin body 1 comprises a liquid-permeable surface layer 3, a flow guide layer, an absorbent core 4 and a breathable bottom layer 5 which are sequentially stacked from top to bottom, the flow guide layer comprises an upper flow guide layer 6 and a lower flow guide layer 7 at the bottom of the upper flow guide layer 6, the breathable bottom layer 5 comprises a first breathable area 51, two transverse sides of the first breathable area 51 are respectively provided with a second breathable area 52 and a third breathable area 53, the first breathable area 51 and the second breathable area 52 are partially overlapped and connected to form a first connecting area 8, the first breathable area 51 and the third breathable area 53 are partially overlapped and connected to form a second connecting area 9, the first breathable zone 51 is a PE breathable membrane, and the second breathable zone 52 and the third breathable zone 53 are nanofiber composite membranes, and the nanofiber composite membranes are formed by compounding modified nanofiber membranes and hot air non-woven fabrics at the bottoms of the modified nanofiber membranes (not shown in the figure). The first and second attachment zones have a width of 5mm, the first breathable zone has a width that is 30% of the total width of the breathable chassis layer, and the second breathable zone has a width that is 35% of the total width of the breathable chassis layer.

The first connecting area and the second connecting area are formed in a hot melt adhesive bonding mode, and ultrasonic welding or other modes can be adopted. The non-woven fabrics in the nanofiber composite membrane can be hot air non-woven fabrics or spun-bonded non-woven fabrics and other non-woven fabrics.

The breathable bottom layer can also be a structure with a nanofiber composite film at the middle section and PE breathable films connected at two sides.

The modified carbon nano tube is prepared by the following steps:

a. adding a carbon nano tube, allylamine and anhydrous ferric chloride into N, N-dimethylformamide with the mass 50 times that of the carbon nano tube, uniformly mixing, carrying out Friedel-crafts reaction at 60 ℃, carrying out suction filtration, washing and drying after reacting for 15 hours to obtain an intermediate, wherein the mass ratio of the carbon nano tube, the allylamine and the anhydrous ferric chloride is 1:6: 2;

b. adding the intermediate into a methanol solution of heptadecafluorodecyltripropoxysilane with the concentration of 10 wt%, wherein the mass ratio of the intermediate to the heptadecafluorodecyltripropoxysilane is 1:1.8, stirring and reacting for 4 hours at 100 ℃, and performing suction filtration, washing and drying after the reaction is finished to obtain the modified carbon nanotube.

The preparation method of the modified nanofiber membrane comprises the following steps:

(1) weighing the following raw materials in parts by weight for later use: 8 parts of polyurethane, 2 parts of bamboo fiber, 4 parts of modified carbon nanotube, 1-3 parts of nano silver particles, 35 parts of ethyl acetate and 35 parts of N, N-dimethylformamide, wherein the bamboo fiber is added into a 10 wt% sodium hydroxide solution for alkali treatment;

(2) dissolving polyurethane in a mixed solvent, adding bamboo fibers, modified carbon nanotubes and nano silver particles, and performing ultrasonic dispersion to obtain a spinning solution, wherein the ultrasonic power is 800W, and the ultrasonic dispersion time is 40 min;

(3) carrying out electrostatic spinning on the spinning solution to obtain a nanofiber membrane; and then soaking the nanofiber membrane into 10 wt% hydroxypropyl trimethyl ammonium chloride chitosan aqueous solution for 3 hours, and then drying in vacuum to obtain the modified nanofiber membrane. The technological parameters of electrostatic spinning are as follows: the voltage was 20kV, the reception distance was 18cm, and the injection speed of the spinning dope was 0.9 mL/h.

The modified nanofiber membrane prepared in this example was subjected to a performance test, and the results show that: the moisture permeability is 12563 g/(m)²24h), water pressure resistance of 98kPa, contact angle of 148.7 °, antibacterial ratio against Staphylococcus aureus (ATCC 11229) of 98.5%, and antibacterial ratio against Escherichia coli (ATCC 29522) of 99.2%.

The upper diversion layer is made of the following fiber raw materials in parts by mass: the hollow viscose fiber is 25 wt% and the polypropylene fiber is 75 wt%, the hollow viscose fiber and the polypropylene fiber are blended to be used as fiber raw materials, and the upper diversion layer is obtained through opening, impurity removal, carding and spunlace net fixation.

The lower flow guide layer is prepared from the following fiber raw materials in percentage by mass: 80 wt% of hollow viscose fiber and 20 wt% of polypropylene fiber, and similarly, the hollow viscose fiber and the polypropylene fiber are blended to be used as fiber raw materials, and the lower diversion layer is obtained through opening, impurity removal, carding and spunlace net fixation.

The moisture permeability of the current guiding layer prepared in this example was tested according to GB/T21655.2-2009 test method, and the results show that: the one-way transfer index of the liquid water from the upper diversion layer to the lower diversion layer is 1289, and the dynamic transfer comprehensive index of the liquid water is 0.85; the one-way transmission index from the lower diversion layer to the upper diversion layer is-184, and the comprehensive index of the dynamic transmission of the liquid water is 0.36.

Example 2

A three-piece breathable sanitary napkin having the same overall structure as in example 1, except that the first attachment zone and the second attachment zone have a width of 8mm, the first breathable zone has a width that is 36% of the total width of the breathable backsheet and the second breathable zone has a width that is 32% of the total width of the breathable backsheet.

The modified carbon nano tube is prepared by the following steps:

a. adding a carbon nano tube, allylamine and anhydrous ferric trichloride into N, N-dimethylformamide with the mass 50 times that of the carbon nano tube, uniformly mixing, reacting at 80 ℃ for 12 hours, and after the reaction is finished, performing suction filtration, washing and drying to obtain an intermediate, wherein the mass ratio of the carbon nano tube, the allylamine and the anhydrous ferric trichloride is 1:8: 3;

b. adding the intermediate into a methanol solution of heptadecafluorodecyltripropoxysilane with the concentration of 10 wt%, wherein the mass ratio of the intermediate to the heptadecafluorodecyltripropoxysilane is 1:2.1, stirring and reacting at 110 ℃ for 3 hours, and performing suction filtration, washing and drying after the reaction is finished to obtain the modified carbon nanotube.

The preparation method of the modified nanofiber membrane comprises the following steps:

(1) weighing the following raw materials in parts by weight for later use: 12 parts of polyurethane, 3 parts of bamboo fiber, 5 parts of modified carbon nanotube, 2 parts of nano silver particles, 20 parts of ethyl acetate and 60 parts of N, N-dimethylformamide;

(2) dissolving polyurethane in a mixed solvent, adding bamboo fibers, modified carbon nanotubes and nano silver particles, and performing ultrasonic dispersion to obtain a spinning solution, wherein the ultrasonic power is 1200W, and the ultrasonic dispersion time is 30 min;

(3) carrying out electrostatic spinning on the spinning solution to obtain a nanofiber membrane; and (3) soaking the nanofiber membrane into a 15 wt% hydroxypropyl trimethyl ammonium chloride chitosan aqueous solution for 2 hours, and then drying in vacuum to obtain the modified nanofiber membrane. The technological parameters of electrostatic spinning are as follows: the voltage was 25kV, the reception distance was 20cm, and the injection speed of the spinning dope was 1.0 mL/h.

The modified nanofiber membrane prepared in this example was subjected to a performance test, and the results show that: the moisture permeability is 12985 g/(m)²24h), water pressure resistance of 102kPa, contact angle of 152.5 °, antibacterial ratio against Staphylococcus aureus (ATCC 11229) of 99.3%, and antibacterial ratio against Escherichia coli (ATCC 29522) of 99.6%.

The flow guide layer comprises an upper flow guide layer and a lower flow guide layer at the bottom of the upper flow guide layer, and the upper flow guide layer is obtained by opening, impurity removing, carding and spunlace net fixing treatment of the following fiber raw materials in parts by mass: 30 wt% of hollow viscose fiber and 70 wt% of polypropylene fiber. The lower diversion layer is obtained by the following fiber raw materials in parts by mass after opening, impurity removal, carding and spunlace net fixation treatment: 85 wt% of hollow viscose fiber and 15 wt% of polypropylene fiber.

The moisture permeability of the current-guiding layer prepared in this example was tested, and the results showed that: the one-way transmission index of the liquid water from the upper diversion layer to the lower diversion layer is 1162, and the dynamic transmission comprehensive index of the liquid water is 0.81; the one-way transmission index from the lower diversion layer to the upper diversion layer is-167, and the comprehensive index of the dynamic transmission of the liquid water is 0.34.

Example 3

A three-piece breathable sanitary napkin having the same overall structure as in example 1, except that the first attachment zone and the second attachment zone have a width of 10mm, the first breathable zone has a width that is 40% of the total width of the breathable backsheet and the second breathable zone has a width that is 30% of the total width of the breathable backsheet.

The modified carbon nano tube is prepared by the following steps:

a. adding a carbon nano tube, allylamine and anhydrous ferric trichloride into N, N-dimethylformamide with the mass 50 times that of the carbon nano tube, uniformly mixing, reacting at 90 ℃ for 8 hours, and after the reaction is finished, performing suction filtration, washing and drying to obtain an intermediate, wherein the mass ratio of the carbon nano tube, the allylamine and the anhydrous ferric trichloride is 1:10: 4.

b. Adding the intermediate into a methanol solution of heptadecafluorodecyltripropoxysilane with the concentration of 10 wt%, wherein the mass ratio of the intermediate to the heptadecafluorodecyltripropoxysilane is 1:2.5, stirring and reacting for 2h at 120 ℃, and performing suction filtration, washing and drying after the reaction is finished to obtain the modified carbon nanotube.

The preparation method of the modified nanofiber membrane comprises the following steps:

(1) weighing the following raw materials in parts by weight for later use: 15 parts of polyurethane, 4 parts of bamboo fiber, 6 parts of modified carbon nanotube, 3 parts of nano silver particles, 30 parts of ethyl acetate and 60 parts of N, N-dimethylformamide;

(2) dissolving polyurethane in a mixed solvent, adding bamboo fibers, modified carbon nanotubes and nano silver particles, and performing ultrasonic dispersion to obtain a spinning solution, wherein the ultrasonic power is 1500W, and the ultrasonic time is 20 min;

(3) carrying out electrostatic spinning on the spinning solution to obtain a nanofiber membrane; and (3) soaking the nanofiber membrane into a hydroxypropyl trimethyl ammonium chloride chitosan aqueous solution with the concentration of 18 wt% for 1h, and then drying in vacuum to obtain the modified nanofiber membrane. The technological parameters of electrostatic spinning are as follows: the voltage was 28kV, the reception distance was 22cm, and the injection speed of the spinning dope was 1.2 mL/h.

The modified nanofiber membrane prepared in this example was subjected to a performance test, and the results show that: the moisture permeability is 13104 g/(m)²24h), water pressure resistance of 105kPa, contact angle of 155.1 °, antibacterial ratio against Staphylococcus aureus (ATCC 11229) of 99.4%, and antibacterial ratio against Escherichia coli (ATCC 29522) of 99.5%.

The flow guide layer comprises an upper flow guide layer and a lower flow guide layer at the bottom of the upper flow guide layer, and the upper flow guide layer is obtained by opening, impurity removing, carding and spunlace net fixing treatment of the following fiber raw materials in parts by mass: 35 wt% of hollow viscose fiber and 65 wt% of polypropylene fiber. The lower diversion layer is obtained by the following fiber raw materials in parts by mass after opening, impurity removal, carding and spunlace net fixation treatment: 90 wt% of hollow viscose fiber and 10 wt% of polypropylene fiber.

The moisture permeability of the current-guiding layer prepared in this example was tested, and the results showed that: the one-way transmission index of the liquid water from the upper diversion layer to the lower diversion layer is 1120, and the dynamic transmission comprehensive index of the liquid water is 0.78; the one-way transmission index from the lower diversion layer to the upper diversion layer is-149, and the comprehensive index of the dynamic transmission of the liquid water is 0.30.

Comparative example 1

The formula components of the modified nanofiber membrane are not added with the modified carbon nano tube, and the weight parts of other raw materials and the preparation steps are consistent with those of the first embodiment.

The modified nanofiber membrane prepared in the comparative example is subjected to performance test, and the result shows that: the moisture permeability is 10793 g/(m)²24h), water pressure resistance of 83kPa, contact angle of 132.8 °, antibacterial ratio against Staphylococcus aureus (ATCC 11229) of 98.2%, and antibacterial ratio against Escherichia coli (ATCC 29522) of 99.1%.

Comparative example 2

The formula components of the modified nanofiber membrane are added with unmodified carbon nanotubes, and the weight parts of other raw materials and the preparation steps are consistent with those of the first embodiment.

The modified nanofiber membrane prepared in the comparative example is subjected to performance test, and the result shows that: the moisture permeability is 11688 g/(m)²24h), water pressure resistance of 89kPa, contact angle of 136.4 °, antibacterial ratio against Staphylococcus aureus (ATCC 11229) of 98.2%, and antibacterial ratio against Escherichia coli (ATCC 29522) of 99.1%.

Comparative example 3

The modified carbon nano tube added in the formula components of the modified nano fiber membrane is a direct product obtained after the carbon nano tube reacts with allylamine, and does not have a crosslinking reaction with heptadecafluorodecyltripropoxysilane, and the weight parts of other raw materials and the preparation steps are consistent with those of the first embodiment.

The modified nanofiber membrane prepared in the comparative example is subjected to performance test, and the result shows that: the moisture permeability is 12187 g/(m)²24h), water pressure resistance of 92kPa, contact angle of 140.1 °, antibacterial ratio against Staphylococcus aureus (ATCC 11229) of 98.8%, and antibacterial ratio against Escherichia coli (ATCC 29522) of 98.9%.

Comparative example 4

The formula components of the modified nanofiber membrane are not added with antibacterial particles, and the weight parts of other raw materials and the preparation steps are the same as those of the first embodiment.

The modified nanofiber membrane prepared in the comparative example is subjected to performance test, and the result shows that: the moisture permeability is 12529 g/(m)²24h), water pressure resistance of 97kPa, contact angle of 148.0 °, antibacterial ratio against Staphylococcus aureus (ATCC 11229) of 75.6%, and antibacterial ratio against Escherichia coli (ATCC 29522) of 79.4%.

Comparative example 5

The nanofiber membrane obtained by electrostatic spinning is directly used, and is not dipped into hydroxypropyl trimethyl ammonium chloride chitosan aqueous solution for post-finishing, and other preparation steps are consistent with those of the first embodiment.

The performance test of the nanofiber membrane prepared in the comparative example shows that: the moisture permeability is 12506 g/(m)²24h), water pressure resistance of 96kPa, contact angle of 148.3 °, antibacterial ratio against Staphylococcus aureus (ATCC 11229) of 88.2%, and antibacterial ratio against Escherichia coli (ATCC 29522) of 87.8%.

The above description is only an embodiment utilizing the technical content of the present disclosure, and any modification and variation made by those skilled in the art can be covered by the claims of the present disclosure, and not limited to the embodiments disclosed.