Antibacterial high-water-absorption sanitary towel and preparation method thereof

Abstract

The invention discloses an antibacterial high-water-absorption sanitary napkin and a preparation method thereof.The antibacterial high-water-absorption sanitary napkin sequentially comprises a bottom film, an absorption core and a skin-friendly layer from bottom to top, and the absorption core is prepared from, by weight, 15-35 parts of sodium polyacrylate, 15-30 parts of polyacrylamide, 20-30 parts of PET, 6-12 parts of carboxymethylcellulose, 2-6 parts of anticoagulant, 2-6 parts of polyvinyl alcohol and 1-3 parts of silver-loaded nano silicon dioxide; the prepared antibacterial high-water-absorption sanitary napkin not only has good absorptivity, but also has a good antibacterial effect.

Description

Technical Field

[0001] The invention relates to the technical field of sanitary napkins, and in particular to an antibacterial high-absorbency sanitary napkin and a preparation method thereof. Background Art

[0002] Most of the existing sanitary napkins increase the absorption capacity of the sanitary napkins through diversion holes. However, due to the limited number of diversion holes, it is difficult to improve the multiple absorption capacity of the sanitary napkins, and the antibacterial performance of the existing sanitary napkins is insufficient. Summary of the invention

[0003] In view of the defects of the above-mentioned prior art, the purpose of the present invention is to provide an antibacterial and highly absorbent sanitary napkin and a preparation method thereof, so as to solve the problems of insufficient multiple absorption capacity and antibacterial ability of the sanitary napkin.

[0004] One of the purposes of the present invention is achieved by the following technical solution:

[0005] The invention discloses an antibacterial high-absorbency sanitary napkin, which comprises a base film, an absorbent core and a skin-friendly layer from bottom to top. The absorbent core comprises the following components in parts by weight: 15-35 parts of sodium polyacrylate, 15-30 parts of polyacrylamide, 20-30 parts of PET, 6-12 parts of carboxymethyl cellulose, 2-6 parts of anticoagulant, 2-6 parts of polyvinyl alcohol and 1-3 parts of silver-loaded nano-silicon dioxide.

[0006] Sodium polyacrylate and polyacrylamide are both hydrophilic polymers with a large number of carboxyl groups on their molecular chains, which can absorb and firmly lock moisture. Carboxymethyl cellulose has good degradability and water absorption. By adding carboxymethyl cellulose, sodium polyacrylate and polyacrylamide and limiting the ratio between the components, the components can play a synergistic role, further improving the absorption capacity and water locking capacity of the absorbent core. At the same time, the prepared sanitary napkin has good degradability.

[0007] The antibacterial effect of sanitary napkins is improved by adding silver-loaded nanosilica.

[0008] Preferably, the preparation method of the silver-loaded nano-silicon dioxide comprises the following steps: dissolving silver nitrate in anhydrous ethanol to prepare a 0.1 mol / L silver nitrate solution, adding nano-silicon dioxide to the silver nitrate solution at a solid-liquid ratio of 1:10, ultrasonically dispersing at 35-40°C for 24 hours, vacuum filtering and washing for multiple times, and drying to obtain the silver-loaded nano-silicon dioxide.

[0009] Preferably, the skin-friendly layer is a pure cotton non-woven fabric layer.

[0010] Preferably, the skin-friendly layer is a chitosan / pure cotton non-woven fabric composite layer, and the preparation method of the chitosan / pure cotton non-woven fabric composite layer comprises the following steps: dissolving chitosan in an acetic acid aqueous solution with a volume percentage concentration of 80%, preparing a spinning solution with a mass percentage concentration of 4%, first winding the pure cotton non-woven fabric onto a spinning receiving roller, then adding the spinning solution into an electrospinning device, spinning on the pure cotton non-woven fabric, and finally forming a chitosan / pure cotton non-woven fabric composite layer.

[0011] Chitosan is compounded on pure cotton non-woven fabric in the form of fiber filaments, so that the skin-friendly layer has a good skin-friendly effect and the antibacterial property of the skin-friendly layer is increased.

[0012] Preferably, the diameter of the chitosan fiber is 50-70 μm, and the thickness of the chitosan fiber layer is less than the thickness of the pure cotton non-woven fabric.

[0013] Preferably, the preparation method of the absorbent core comprises the following steps: shearing and mixing sodium polyacrylate, polyacrylamide, PET, carboxymethyl cellulose, anticoagulant, polyvinyl alcohol and silver-loaded nano-silicon dioxide, and then melt-extruded through a twin-screw extruder, and then cooled, pelletized and dried to obtain highly water-absorbent PET masterbatch, and the highly water-absorbent PET masterbatch is melt-spinned to obtain the absorbent core.

[0014] The absorbent core is prepared as a spinning layer so that the pores in the absorbent core are interconnected, and menstrual blood quickly infiltrates through the through pores, reducing the coagulation and blockage of blood on the surface of the absorbent core and absorbing faster.

[0015] Preferably, the anticoagulant includes one or more of sodium citrate, ethylenediaminetetraacetic acid and heparin. The anticoagulant can reduce the blood coagulation ability of blood on the surface of the absorbent core, prevent menstrual blood from coagulating quickly on the surface, further avoid menstrual blood from clotting on the surface of the absorbent core, and provide more time and opportunity for menstrual blood to seep down.

[0016] Preferably, the absorbent core comprises the following components in parts by weight: 20 parts of sodium polyacrylate, 20 parts of polyacrylamide, 25 parts of PET, 10 parts of carboxymethyl cellulose, 4 parts of anticoagulant, 4 parts of polyvinyl alcohol and 1.5 parts of silver-loaded nano-silicon dioxide.

[0017] The second object of the present invention is achieved by adopting the following technical solution:

[0018] A method for preparing an antibacterial high-absorbency sanitary napkin comprises the following steps: cutting a base film, an absorbent core and a skin-friendly layer, placing them in a bonding device in sequence, and bonding them in sequence by the bonding device to prepare a multi-layer absorbent structure sanitary napkin.

[0019] The preparation method has simple operation process and is suitable for mass production.

[0020] The beneficial effects of the present invention are:

[0021] 1. Sodium polyacrylate and polyacrylamide are both hydrophilic polymers with a large number of carboxyl groups on their molecular chains, which can absorb and firmly lock moisture. Carboxymethyl cellulose has good degradability and water absorption. By adding carboxymethyl cellulose, sodium polyacrylate and polyacrylamide and limiting the ratio between the components, the components play a synergistic role, further improving the absorption capacity and water locking capacity of the absorbent core, and the prepared sanitary napkin has good degradability;

[0022] 2. Improve the antibacterial effect of sanitary napkins by adding silver-loaded nano-silica. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects solved by the invention more clearly understood, the invention is further described below in conjunction with embodiments. It should be noted that the raw materials, equipment, etc. used in the following embodiments can be obtained by purchase unless otherwise specified.

[0024] Embodiments 1 to 5

[0025] The raw materials were weighed according to the ratios in Table 1, and sanitary napkins were made according to the preparation method in Table 1 to obtain sanitary napkins of different embodiments. See Table 1 for details:

[0026] Table 1 Absorbent core raw material ratio table of Examples 1 to 5

[0027]

[0028] Among them, the preparation method of the absorbent core in Examples 1 to 5 of Table 1 comprises the following steps: sodium polyacrylate, polyacrylamide, PET, carboxymethyl cellulose, anticoagulant, polyvinyl alcohol and silver-loaded nano-silicon dioxide are sheared and mixed, and then melt-extruded through a twin-screw extruder, and then cooled, pelletized and dried to obtain a highly water-absorbent PET masterbatch. The same melting temperature, extrusion temperature, extrusion speed, etc. are set in Examples 1 to 5, and the highly water-absorbent PET masterbatch is melt-spinned to obtain an absorbent core.

[0029] The preparation method of silver-loaded nano-silicon dioxide in Examples 1 to 5 of Table 1 comprises the following steps: dissolving silver nitrate in anhydrous ethanol to prepare a 0.1 mol / L silver nitrate solution, adding nano-silicon dioxide to the silver nitrate solution at a solid-liquid ratio of 1:10, ultrasonically dispersing at 35 to 40° C. for 24 hours, vacuum filtering and washing three times, and drying to obtain silver-loaded nano-silicon dioxide.

[0030] In Examples 1 to 4 of Table 1, the skin-friendly layer adopts a pure cotton non-woven fabric layer, and in Example 5, the skin-friendly layer adopts a chitosan / pure cotton non-woven fabric composite layer. The preparation method of the chitosan / pure cotton non-woven fabric composite layer comprises the following steps: dissolving chitosan in an acetic acid aqueous solution with a volume percentage concentration of 80% to prepare a spinning solution with a mass percentage concentration of 4%, first winding the pure cotton non-woven fabric on a spinning receiving roller, and then adding the spinning solution to an electrospinning device, adjusting the spinning speed to 3 ml / h, the receiving roller speed to 500 rpm and other working parameters, spinning on the pure cotton non-woven fabric, and finally forming a chitosan / pure cotton non-woven fabric composite layer, wherein the chitosan layer is attached to the absorbent core.

[0031] The anticoagulant is sodium citrate.

[0032] The preparation method of the antibacterial highly absorbent sanitary napkins of Examples 1 to 5 in Table 1 comprises the following steps: cutting the base film, the absorbent core and the skin-friendly layer, placing them in a bonding device in sequence, and pasting them in sequence by the bonding device to obtain the antibacterial highly absorbent sanitary napkins.

[0033] Comparative Example 1

[0034] The difference between Comparative Example 1 and Example 1 is that no silver-loaded nano-silicon dioxide is added to the absorbent core of Comparative Example 1.

[0035] Comparative Example 2

[0036] The difference between Comparative Example 2 and Example 1 is that sodium polyacrylate is replaced by polyacrylamide.

[0037] Comparative Example 3

[0038] The difference between Comparative Example 3 and Example 1 is that polyacrylamide is replaced by sodium polyacrylate.

[0039] Comparative Example 4

[0040] The difference between Comparative Example 4 and Example 1 is that no carboxymethyl cellulose is added.

[0041] Comparative Example 5

[0042] The difference between Comparative Example 5 and Example 1 is that no anticoagulant is added.

[0043] Comparative Example 6

[0044] The difference between Comparative Example 6 and Example 1 is that no polyvinyl alcohol is added.

[0045] The sanitary napkins of Examples 1 to 5 and Comparative Examples 1 to 6 were subjected to absorption rate, rewet volume and antibacterial tests, as follows:

[0046] Absorption speed test: Lay the sanitary napkin flat on the operating table, and inject (23±1)℃ menstrual blood simulation liquid through the long tube into the sanitary napkin at about two-thirds of the front end. Inject 3ml of menstrual blood simulation liquid each time, and record the absorption time S1 from the time the menstrual blood simulation liquid visually touches the sanitary napkin to the time the simulation liquid in the long tube is completely absorbed. After three minutes of rest, repeat the above action and record the second absorption time S2. After three minutes of rest, repeat the above action again and record the third absorption time S3.

[0047] Back-seepage test: Lay the sanitary napkin flat on the operating table, and quickly inject (23±1)℃ menstrual blood simulation liquid through a long tube into the front two-thirds of the sanitary napkin. Inject 3ml of menstrual blood simulation liquid each time. After an interval of 1min, take a 1kg pressing block and press the filter paper flat on the surface of the sanitary napkin. After 30s of rest, remove the filter paper, record the weight of the filter paper before and after absorbing the back-seepage liquid, and calculate the mass of the back-seepage liquid.

[0048] Antibacterial test: Lay the sanitary napkin flat on the operating table, pour 10 ml of (23±1)℃ menstrual blood simulation fluid evenly on the sanitary napkin, and after it is completely absorbed, place the sanitary napkin in a closed space at 37℃ and a relative humidity of 75%. Place open-cultured Escherichia coli culture, Candida albicans culture and Streptococcus culture in the closed space, cut unit volume (1cm﹡1cm﹡1cm) samples from the surface after 2h and 8h, respectively, cut them into pieces and disperse them in 100mL of deionized water, soak them for 3h, filter them, take 1mL of the sample and culture it at 37℃ for 48h, and determine the total colony count (CFU / mL).

[0049] The test results of the above absorption rate, re-permeation amount and antibacterial properties are shown in Table 2.

[0050] Table 2 Absorption rate, re-permeation amount and antibacterial test results of Examples 1 to 5 and Comparative Examples 1 to 6

[0051]

[0052] Combined with the above table, Example 1 is compared with Comparative Example 1 and Example 5 to find that when silver-loaded nano-silicon dioxide is not added to the absorbent core, the sanitary napkin will experience backseepage. This is because silver-loaded nano-silicon dioxide is an inorganic substance. When it is added to the absorbent core, it will provide a certain support effect for the fiber skeleton of the absorbent core. When the simulated liquid penetrates into the sanitary napkin, it can slow down the collapse of the fiber skeleton of the absorbent core to a certain extent, making it easier for the simulated liquid to flow into the absorbent core. At the same time, when silver-loaded nano-silicon dioxide is not added to the absorbent core, its antibacterial effect is poor. When a chitosan / pure cotton non-woven fabric composite layer is used as a skin-friendly layer, not only can the antibacterial effect of the sanitary napkin be further improved, but also the absorption rate of the sanitary napkin can be increased. This is because the chitosan molecule contains polar groups such as hydroxyl groups and amino groups, has a strong hygroscopicity, and can quickly absorb the simulated liquid into the absorbent core.

[0053] By comparing Example 1 with Comparative Examples 2, 3 and 4, it is found that the lack of sodium polyacrylate, polyacrylamide or carboxymethyl cellulose will affect the absorption rate of the sanitary napkin; by comparing Example 1 with Comparative Examples 5 and 6, it is found that the lack of anticoagulant will affect the absorption rate and re-permeability of the sanitary napkin, and the lack of polyvinyl alcohol will not only affect the absorption rate and re-permeability of the sanitary napkin, but also affect the antibacterial properties of the sanitary napkin.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should fall within the protection scope of the present invention.

Claims

1. An antibacterial highly absorbent sanitary napkin, It is characterized in that The invention comprises, from bottom to top, a base film, an absorbent core and a skin-friendly layer. The absorbent core comprises the following components by weight: 15-35 parts of sodium polyacrylate, 15-30 parts of polyacrylamide, 20-30 parts of PET, 6-12 parts of carboxymethyl cellulose, 2-6 parts of anticoagulant, 2-6 parts of polyvinyl alcohol and 1-3 parts of silver-loaded nano-silicon dioxide.

2. An antibacterial highly absorbent sanitary napkin according to claim 1, It is characterized in that The preparation method of the silver-loaded nano-silicon dioxide comprises the following steps: dissolving silver nitrate in anhydrous ethanol to prepare a 0.1 mol / L silver nitrate solution, adding nano-silicon dioxide into the silver nitrate solution at a solid-liquid ratio of 1:10, ultrasonically dispersing at 35-40°C for 24 hours, vacuum filtering and washing for multiple times, and drying to obtain the silver-loaded nano-silicon dioxide.

3. The antibacterial highly absorbent sanitary napkin according to claim 1, It is characterized in that The skin-friendly layer is a pure cotton non-woven fabric layer.

4. The antibacterial highly absorbent sanitary napkin according to claim 1, It is characterized in that The skin-friendly layer is a chitosan / pure cotton non-woven fabric composite layer. The preparation method of the chitosan / pure cotton non-woven fabric composite layer comprises the following steps: dissolving chitosan in an acetic acid aqueous solution with a volume percentage concentration of 80% to prepare a spinning solution with a mass percentage concentration of 4%, firstly winding the pure cotton non-woven fabric onto a spinning receiving roller, then adding the spinning solution into an electrostatic spinning device, spinning on the pure cotton non-woven fabric, and finally forming a chitosan / pure cotton non-woven fabric composite layer.

5. The antibacterial highly absorbent sanitary napkin according to claim 4, It is characterized in that The diameter of the chitosan fiber is 50-70 μm, and the thickness of the chitosan fiber layer is less than the thickness of the pure cotton non-woven fabric.

6. The antibacterial highly absorbent sanitary napkin according to claim 1, It is characterized in that The preparation method of the absorbent core comprises the following steps: sodium polyacrylate, polyacrylamide, PET, carboxymethyl cellulose, anticoagulant, polyvinyl alcohol and silver-loaded nano-silicon dioxide are sheared and mixed, and then melt-extruded through a twin-screw extruder, and then cooled, pelletized and dried to obtain a highly water-absorbent PET masterbatch, and the highly water-absorbent PET masterbatch is melt-spinned to obtain an absorbent core.

7. The antibacterial highly absorbent sanitary napkin according to claim 1, It is characterized in that The anticoagulant includes one or more of sodium citrate, ethylenediaminetetraacetic acid and heparin.

8. The antibacterial highly absorbent sanitary napkin according to claim 1, It is characterized in that The absorbent core comprises the following components in parts by weight: 20 parts of sodium polyacrylate, 20 parts of polyacrylamide, 25 parts of PET, 10 parts of carboxymethyl cellulose, 4 parts of anticoagulant, 4 parts of polyvinyl alcohol and 1.5 parts of silver-loaded nano-silicon dioxide.

9. A method for preparing an antibacterial highly absorbent sanitary napkin according to any one of claims 1 to 8, It is characterized in that The method comprises the following steps: cutting the base film, the absorbent core and the skin-friendly layer, placing them in a bonding device in sequence, and bonding them in sequence by the bonding device to obtain a multi-layer absorbent structure sanitary napkin.

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