Curing type sanitary towel and preparation method thereof
By preparing microcapsules with composite materials such as chitosan and sodium carboxymethyl starch, the problem of low release efficiency of microcapsules on whim sanitary napkins is solved, and the appropriate release rate and effective antibacterial effect are achieved, avoiding the Waste of resources.
Patent Information
- Application Number
- CN202410542578.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2025-02-07
AI Technical Summary
The release efficiency of microcapsules on menstrual whim sanitary napkins is low, resulting in waste of resources and failing to fully play its role.
By preparing microcapsules made of composite chitosan and sodium carboxymethyl starch, the release rate of microcapsules is controlled to ensure good in an acidic environment by combining modified chitosan and plulandosan. antibacterial effect and appropriate release speed.
The appropriate release rate of microcapsules on sanitary napkins is achieved, which avoids waste of resources and ensures its effective role in menstrual blood environment.
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Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of sanitary napkins, and in particular, relates to a maintenance type sanitary napkin and a preparation method thereof. Background Art
[0002] The application of microcapsule technology in the production process of sanitary napkins can significantly broaden the functions of sanitary napkins and has great development prospects. The application of microcapsule technology in the production process of sanitary napkins is achieved by finishing fabrics with microcapsules, which is mainly achieved by the following means: using microcapsule finishing liquid for post-finishing methods to prepare functional textile fabrics for sanitary napkins. This method has a simple preparation process and a wide range of applications.
[0003] However, when microcapsule technology is applied to sanitary napkins, the environment on sanitary napkins is complex during menstruation and the release efficiency of microcapsules is ignored. In particular, because the microcapsules release slowly and are replaced before the effective ingredients are fully released, the microcapsules cannot fully exert their functions, resulting in a waste of resources. Summary of the invention
[0004] The object of the present invention is to provide a maintenance type sanitary napkin, wherein the microcapsules have a suitable release rate and the microcapsule-encapsulated material can be effectively utilized.
[0005] The second object of the present invention is to provide a method for preparing the above-mentioned maintenance sanitary napkin.
[0006] The purpose of the present invention can be achieved through the following technical solutions: A maintenance sanitary napkin, comprising a surface layer, an absorption layer and a bottom layer, characterized in that the surface layer is a non-woven fabric with microcapsules attached; The preparation method of the microcapsules comprises the following operations: Configuration of modified chitosan: Chitosan, isopropanol and glycidyl trimethylammonium chloride are reacted, alcohol precipitation and alcohol washing are performed to obtain a crude product, and the crude product is dissolved, dialyzed and dried to obtain modified chitosan; Preparation of microcapsules: The modified chitosan and chitosan are mixed to prepare composite chitosan, and the composite chitosan is dissolved in acetic acid solution to prepare a composite chitosan solution; Dissolve sodium carboxymethyl starch in distilled water to prepare sodium carboxymethyl starch solution; The composite chitosan solution, sodium carboxymethyl starch solution and pullulan are mixed to obtain a prefabricated liquid, microcapsule core materials are added to the prefabricated liquid while being homogenized to obtain a prefabricated mixed liquid, and the prefabricated mixed liquid is freeze-dried to obtain microcapsule powder.
[0007] As a preferred embodiment of the present invention, the microcapsule core material includes shea butter essential oil.
[0008] As a preferred embodiment of the present invention, the surface layer is a non-woven fabric with microcapsules attached thereto. Specifically, the microcapsules are made into a composite membrane liquid containing microcapsules, and the composite membrane liquid is sprayed on the surface of the non-woven fabric by a spraying method; the raw materials of the composite membrane liquid include chitosan, microcapsules, shea butter essential oil, and pullulan in a mass ratio of 1.8~2.2g:1g:0.1~0.3mL:0.3~0.5g.
[0009] The preparation method of the above-mentioned maintenance type sanitary napkin comprises the following operations: preparing microcapsules; Preparing a composite membrane solution containing microcapsules; The composite film liquid is sprayed on the surface of the non-woven fabric by a spraying method, and then the non-woven fabric is used as the surface layer, and the absorption layer and the bottom layer are pressed together to obtain a maintenance type sanitary napkin.
[0010] As a preferred embodiment of the present invention, the glycidyl trimethyl ammonium chloride in the modified chitosan is added in the form of a 20wt% glycidyl trimethyl ammonium chloride solution; the amount ratio of the isopropanol, chitosan and the 20wt% glycidyl trimethyl ammonium chloride solution is 8-12mL:1g:6-10mL.
[0011] As a preferred embodiment of the present invention, in the preparation of microcapsules, the modified chitosan and chitosan are mixed at a mass ratio of 1:5-9 to obtain composite chitosan.
[0012] As a preferred embodiment of the present invention, the volume ratio of the composite chitosan solution and the sodium carboxymethyl starch solution in preparing the microcapsules is 3-5:3, and the mass concentration ratio is 1:1.
[0013] As a preferred embodiment of the present invention, the pullulan content in the prefabricated liquid is 1.5-2 wt %.
[0014] As a preferred embodiment of the present invention, the mass ratio of shea butter essential oil to sodium carboxymethyl starch in the preparation of microcapsules is 1 / 4 to 8.
[0015] As a preferred embodiment of the present invention, freeze-drying the prefabricated mixed solution in preparing microcapsules specifically comprises: cooling the prefabricated mixed solution to -100 to -80°C, and then freeze-drying it in vacuum.
[0016] Beneficial effects of the present invention: The microcapsules attached to the surface layer of the sanitary napkin provided by the present invention are prepared from composite chitosan and sodium carboxymethyl starch. Wherein, the composite chitosan is prepared by mixing modified chitosan and chitosan, and the modified chitosan is prepared by modifying chitosan with glycidyl trimethyl ammonium chloride. The modified chitosan gives the microcapsules excellent antibacterial properties due to the presence of glycidyl trimethyl ammonium chloride. After the modified chitosan and chitosan are mixed, the microcapsules are given good antibacterial properties while controlling the cost, and the microcapsules will not be rapidly disintegrated due to the presence of the modified chitosan, and the release rate is moderate. Wherein, sodium carboxymethyl starch is an anionic starch ether, which has the characteristics of electronegativity and cold water swellability, and can improve the stability of the embedded material through polymerization and the formation of hydrogen bonds, thereby providing a sustained release function. Pullulan has good film-forming properties, adhesion, enzyme degradability, water absorption and antioxidant properties, and can be used in the preparation of microcapsules. The -NH2 of the chitosan backbone is protonated in the acidic environment of menstrual blood and forms hydrophilic -NH3 + The group can generate huge electrostatic repulsion in the polymer, improve the solubility of chitosan, and show sustained release performance in the acidic environment of menstrual blood. Under body temperature, the chitosan chain releases protons, and the carboxyl groups in sodium carboxymethyl starch can accept protons, resulting in a decrease in the protonation degree in the chitosan molecule, preventing the microcapsules from disintegrating. Pullulan synergistically composites chitosan and sodium carboxymethyl starch to make microcapsules attached to the surface of sanitary napkins, which maintain good antibacterial effects and suitable release rates under the acidic conditions of human menstrual blood.
[0017] Furthermore, the microcapsule loading material in the present invention is shea butter essential oil. Shea butter essential oil has good human skin compatibility, can moisturize the skin, and can also inhibit skin inflammation during menstruation, repair the skin, and enhance the protective effect on the skin.
[0018] Further, the above-mentioned microcapsules are made into the composite membrane liquid containing microcapsules, sprayed on nonwoven fabrics, and then the nonwoven fabrics are made into the maintenance type sanitary towel as the surface layer. Shea butter essential oil is made into the composite membrane liquid together with chitosan as raw materials, and shea butter essential oil, as a hydrophobic component, is added to the membrane liquid, and produces interaction force with chitosan molecules, causing the gap in the composite membrane formed to become larger, and the holes increase, so that the compactness of the chitosan composite membrane decreases, and has good air permeability. And the interpolation of shea butter essential oil introduces hydrogen bond, strengthens the intermolecular force between it and the film, and improves the water absorption rate of the composite membrane formed. DETAILED DESCRIPTION
[0019] The present invention is further described in detail below in conjunction with specific implementation methods.
[0020] Example 1 A microcapsule is prepared by the following preparation method: 1. Prepare modified chitosan: 3kg chitosan was dissolved in 1wt% acetic acid solution, and the pH was adjusted to 8.8-9.2 with NaOH. The precipitate was filtered out, and the precipitate was added with isopropanol and mixed evenly. Then 20wt% glycidyl trimethyl ammonium chloride solution was added, and the amount ratio of isopropanol, chitosan and 20wt% glycidyl trimethyl ammonium chloride solution was 8mL:1g:6mL. The mixture was heated to 60℃ and reacted for 5h. After completion, ethanol was used for precipitation, and the precipitate was filtered and washed with 70wt% ethanol solution to obtain a crude product. The crude product was dissolved in water, filtered, and the filtrate was precipitated with acetone to obtain a precipitate. The precipitate was dissolved in water to obtain a solution, and the solution was washed with a 70wt% ethanol solution with a molecular weight cutoff of 1×10 4 After dialysis for three days, the product was concentrated and dried in a vacuum environment to obtain modified chitosan.
[0021] 2. Preparation of microcapsules: (1) Modified chitosan and chitosan were mixed in a mass ratio of 1:5 to prepare composite chitosan, and 2 kg of composite chitosan was dissolved in 1 wt % acetic acid solution to prepare a composite chitosan solution with a volume fraction of 2%; (2) Dissolve 2 kg of sodium carboxymethyl starch in distilled water to prepare a 2% sodium carboxymethyl starch solution; (3) The composite chitosan solution and the sodium carboxymethyl starch solution were mixed in a volume ratio of 3:3, and then pullulan was added to obtain a prefabricated liquid, wherein the pullulan content in the prefabricated liquid was 1.5 wt %; the prefabricated liquid was placed for 24 hours and then added to a high-speed homogenizer, and homogenized at 8000 r / min for 15 minutes while shea butter essential oil was added dropwise at a speed of 1 drop / s to obtain a prefabricated mixed liquid, wherein the mass ratio of shea butter essential oil to sodium carboxymethyl starch was 1:4; the prefabricated mixed liquid was cooled to -100°C, and then vacuum freeze-dried to obtain microcapsule powder.
[0022] Example 2 A microcapsule is prepared by the following preparation method: 1. Prepare modified chitosan: 3kg chitosan was dissolved in 1wt% acetic acid solution, and the pH was adjusted to 8.8-9.2 with NaOH. The precipitate was filtered out, and the precipitate was added with isopropanol and mixed evenly. Then 20wt% glycidyl trimethyl ammonium chloride solution was added, and the amount ratio of isopropanol, chitosan and 20wt% glycidyl trimethyl ammonium chloride solution was 9mL:1g:7mL. The mixture was heated to 62℃ and reacted for 5.2h. After completion, ethanol was used for precipitation, and the precipitate was filtered and washed with 70wt% ethanol solution to obtain a crude product. The crude product was dissolved in water, filtered, and the filtrate was precipitated with acetone to obtain a precipitate. The precipitate was dissolved in water to obtain a solution, and the solution was washed with a 70wt% ethanol solution with a molecular weight cutoff of 1×10 4 After dialysis for three days, the product was concentrated and dried in a vacuum environment to obtain modified chitosan.
[0023] 2. Preparation of microcapsules: (1) Modified chitosan and chitosan were mixed in a mass ratio of 1:6 to prepare composite chitosan, and 2 kg of composite chitosan was dissolved in 1 wt % acetic acid solution to prepare a composite chitosan solution with a volume fraction of 2%; (2) Dissolve 2 kg of sodium carboxymethyl starch in distilled water to prepare a 2% sodium carboxymethyl starch solution; (3) The composite chitosan solution and the sodium carboxymethyl starch solution were mixed in a volume ratio of 3.5:3, and then pullulan was added to obtain a prefabricated liquid, wherein the pullulan content in the prefabricated liquid was 1.6 wt %; the prefabricated liquid was placed for 24 h and then added to a high-speed homogenizer, and homogenized at 9000 r / min for 15 min while shea butter essential oil was added dropwise at a speed of 1 drop / s to obtain a prefabricated mixed liquid, wherein the mass ratio of shea butter essential oil to sodium carboxymethyl starch was 1:5; the prefabricated mixed liquid was cooled to -95°C, and then vacuum freeze-dried to obtain microcapsule powder.
[0024] Example 3 A microcapsule is prepared by the following preparation method: 1. Prepare modified chitosan: 3kg chitosan was dissolved in 1wt% acetic acid solution, and the pH was adjusted to 8.8-9.2 with NaOH. The precipitate was filtered out, and the precipitate was added to isopropanol and mixed evenly. Then 20wt% glycidyl trimethyl ammonium chloride solution was added, and the amount ratio of isopropanol, chitosan and 20wt% glycidyl trimethyl ammonium chloride solution was 10mL:1g:8mL. The mixture was heated to 65℃ and reacted for 5.5h. After completion, ethanol was used for precipitation, and the precipitate was filtered and washed with 70wt% ethanol solution to obtain a crude product. The crude product was dissolved in water, filtered, and the filtrate was precipitated with acetone to obtain a precipitate. The precipitate was dissolved in water to obtain a solution, and the solution was washed with a 70wt% ethanol solution with a molecular weight cutoff of 1×10 4 After dialysis for three days, the product was concentrated and dried in a vacuum environment to obtain modified chitosan.
[0025] 2. Preparation of microcapsules: (1) Modified chitosan and chitosan were mixed in a mass ratio of 1:7 to prepare composite chitosan, and 2 kg of composite chitosan was dissolved in 1 wt % acetic acid solution to prepare a composite chitosan solution with a volume fraction of 2%; (2) Dissolve 2 kg of sodium carboxymethyl starch in distilled water to prepare a 2% sodium carboxymethyl starch solution; (3) The composite chitosan solution and the sodium carboxymethyl starch solution were mixed in a volume ratio of 4:3, and then pullulan was added to obtain a prefabricated liquid, wherein the pullulan content in the prefabricated liquid was 1.7 wt %; the prefabricated liquid was placed for 24 hours and then added to a high-speed homogenizer, and homogenized at 10,000 r / min for 15 minutes while shea butter essential oil was added dropwise at a speed of 1 drop / s to obtain a prefabricated mixed liquid, wherein the mass ratio of shea butter essential oil to sodium carboxymethyl starch was 1:6; the prefabricated mixed liquid was cooled to -90°C, and then vacuum freeze-dried to obtain microcapsule powder.
[0026] Example 4 A microcapsule is prepared by the following preparation method: 1. Prepare modified chitosan: 3kg chitosan was dissolved in 1wt% acetic acid solution, and the pH was adjusted to 8.8-9.2 with NaOH. The precipitate was filtered out, and the precipitate was added to isopropanol and mixed evenly. Then 20wt% glycidyl trimethyl ammonium chloride solution was added, and the amount ratio of isopropanol, chitosan and 20wt% glycidyl trimethyl ammonium chloride solution was 11mL:1g:9mL. The mixture was heated to 68℃ and reacted for 5.8h. After completion, ethanol was used for precipitation, and the precipitate was filtered and washed with 70wt% ethanol solution to obtain a crude product. The crude product was dissolved in water, filtered, and the filtrate was precipitated with acetone to obtain a precipitate. The precipitate was dissolved in water to obtain a solution, and the solution was washed with a 70wt% ethanol solution with a molecular weight cutoff of 1×10 4 After dialysis for three days, the product was concentrated and dried in a vacuum environment to obtain modified chitosan.
[0027] 2. Preparation of microcapsules: (1) Modified chitosan and chitosan were mixed in a mass ratio of 1:8 to prepare composite chitosan, and 2 kg of composite chitosan was weighed and dissolved in 1 wt % acetic acid solution to prepare a composite chitosan solution with a volume fraction of 2%; (2) Dissolve 2 kg of sodium carboxymethyl starch in distilled water to prepare a 2% sodium carboxymethyl starch solution; (3) The composite chitosan solution and the sodium carboxymethyl starch solution were mixed in a volume ratio of 4.5:3, and then pullulan was added to obtain a prefabricated liquid, wherein the pullulan content in the prefabricated liquid was 1.8 wt %; the prefabricated liquid was placed for 24 hours and then added to a high-speed homogenizer, and shea butter essential oil was added dropwise at a rate of 1 drop / s while being homogenized at 11000 r / min for 15 minutes to obtain a prefabricated mixed liquid, wherein the mass ratio of shea butter essential oil to sodium carboxymethyl starch was 1:7; the prefabricated mixed liquid was cooled to -85°C, and then vacuum freeze-dried to obtain microcapsule powder.
[0028] Example 5 A microcapsule is prepared by the following preparation method: 1. Prepare modified chitosan: 3kg chitosan was dissolved in 1wt% acetic acid solution, and the pH was adjusted to 8.8-9.2 with NaOH. The precipitate was filtered out, and the precipitate was added to isopropanol and mixed evenly. Then 20wt% glycidyl trimethyl ammonium chloride solution was added, and the amount ratio of isopropanol, chitosan and 20wt% glycidyl trimethyl ammonium chloride solution was 12mL:1g:10mL. The mixture was heated to 70℃ and reacted for 6h. After completion, ethanol was used for precipitation, and the precipitate was filtered and washed with 70wt% ethanol solution to obtain a crude product. The crude product was dissolved in water, filtered, and the filtrate was precipitated with acetone to obtain a precipitate. The precipitate was dissolved in water to obtain a solution, and the solution was washed with a 70wt% ethanol solution with a molecular weight cutoff of 1×10 4 After dialysis for three days, the product was concentrated and dried in a vacuum environment to obtain modified chitosan.
[0029] 2. Preparation of microcapsules: (1) Modified chitosan and chitosan were mixed in a mass ratio of 1:9 to prepare composite chitosan, and 2 kg of composite chitosan was weighed and dissolved in 1 wt % acetic acid solution to prepare a composite chitosan solution with a volume fraction of 2%; (2) Dissolve 2 kg of sodium carboxymethyl starch in distilled water to prepare a 2% sodium carboxymethyl starch solution; (3) The composite chitosan solution and the sodium carboxymethyl starch solution were mixed in a volume ratio of 5:3, and then pullulan was added to obtain a prefabricated liquid, wherein the pullulan content in the prefabricated liquid was 2 wt %; the prefabricated liquid was placed for 24 h and then added to a high-speed homogenizer, and homogenized at 12000 r / min for 15 min while shea butter essential oil was added dropwise at a speed of 1 drop / s to obtain a prefabricated mixed liquid, wherein the mass ratio of shea butter essential oil to sodium carboxymethyl starch was 1:8; the prefabricated mixed liquid was cooled to -80°C, and then vacuum freeze-dried to obtain microcapsule powder.
[0030] Comparative Example 1 A microcapsule, which is different from Example 3 in that, when preparing the microcapsule, an equal amount of composite chitosan is used instead of sodium carboxymethyl starch, and the rest is the same as Example 3.
[0031] Comparative Example 2 A microcapsule, which is different from Example 3 in that, in the preparation of the microcapsule, when preparing the composite chitosan, an equal amount of modified chitosan is used to replace chitosan, and the rest is the same as Example 3.
[0032] Comparative Example 3 A microcapsule, which is different from Example 3 in that, in the preparation of the microcapsule, when preparing the composite chitosan, an equal amount of chitosan is used to replace the modified chitosan, and the rest is the same as Example 3.
[0033] Comparative Example 4 A microcapsule, which is different from Example 3 in that, when preparing the microcapsule, the volume ratio of the composite chitosan solution to the sodium carboxymethyl starch solution is 3:5, and the rest is the same as Example 3.
[0034] The microcapsules prepared in Examples 1 to 5 and Comparative Examples 1 to 4 were tested as follows: Test Example 1 Determination of microcapsule release performance The prepared microcapsules were placed in triangular flasks, and then simulated blood was added, the pH was adjusted to 6.5, and the shaking was timed for 4 hours. Samples were taken from the supernatant, the OD value was measured, and the shea butter essential oil concentration in the supernatant was calculated according to the standard curve. The release rate calculation formula is as follows, and the results are shown in Table 1: Release rate % = cumulative shea butter essential oil content taken out / total shea butter essential oil content in microcapsules Table 1 As shown in Table 1, the microcapsules provided in Examples 1 to 5 have a good release rate (all > 80%) within 4 hours, and no disintegration occurs. It conforms to the use characteristics of sanitary napkins and can meet the needs of sanitary napkins. Comparative Examples 1 and 2 use an equal amount of composite chitosan to replace sodium carboxymethyl starch, and an equal amount of modified chitosan to replace chitosan, respectively. Although they have good release rates of 85.6% and 87.1%, they disintegrate in 2 hours or even 40 minutes, which cannot meet the use requirements of sanitary napkins. Comparative Example 3 uses an equal amount of chitosan to replace modified chitosan, and its release rate is as low as 52.4, resulting in a large waste of resources. Comparative Examples 1 to 3 illustrate that the components of the microcapsules can only maintain a good release rate and not disintegrate under the components provided in the embodiments of the present invention. The volume ratio of the composite chitosan solution and the sodium carboxymethyl starch solution in Comparative Example 4 is 3:5, and its release rate is also significantly reduced compared with Examples 1 to 5. It can be seen that the amount of composite chitosan and sodium carboxymethyl starch has a significant effect on the release rate.
[0035] Example 6 A composite membrane liquid containing microcapsules 5kg chitosan was dissolved in 1wt% acetic acid solution to prepare a chitosan solution with a volume fraction of 2%, and stirred until completely dissolved. The microcapsules, glycerol, shea butter essential oil, pullulan, Tween-80 and calcium chloride prepared in Example 1 were added, wherein the amount ratio of chitosan, microcapsules, glycerol, shea butter essential oil, pullulan, Tween-80 and calcium chloride was 1.8g:1g:1.2g:0.1mL:0.3g:0.1g:0.2g, and the composite membrane liquid containing microcapsules was obtained by homogenizing at 8000r / min for 3min.
[0036] Example 7 A composite membrane liquid containing microcapsules 5kg chitosan was dissolved in 1wt% acetic acid solution to prepare a chitosan solution with a volume fraction of 2%, and stirred until completely dissolved. The microcapsules, glycerol, shea butter essential oil, pullulan, Tween-80 and calcium chloride prepared in Example 1 were added, wherein the amount ratio of chitosan, microcapsules, glycerol, shea butter essential oil, pullulan, Tween-80 and calcium chloride was 1.9g:1g:1.25g:0.15mL:0.35g:0.11g:0.22g, and the composite membrane liquid containing microcapsules was obtained by homogenizing at 9000r / min for 3.5min.
[0037] Example 8 A composite membrane liquid containing microcapsules 5kg chitosan was dissolved in 1wt% acetic acid solution to prepare a chitosan solution with a volume fraction of 2%, and stirred until completely dissolved. The microcapsules, glycerol, shea butter essential oil, pullulan, Tween-80 and calcium chloride prepared in Example 1 were added, wherein the amount ratio of chitosan, microcapsules, glycerol, shea butter essential oil, pullulan, Tween-80 and calcium chloride was 2g:1g:1.3g:0.2mL:0.4g:0.13g:0.25g, and the composite membrane liquid containing microcapsules was obtained by homogenizing at 10000r / min for 4min.
[0038] Example 9 A composite membrane liquid containing microcapsules 5kg chitosan was dissolved in 1wt% acetic acid solution to prepare a chitosan solution with a volume fraction of 2%, and stirred until completely dissolved. The microcapsules, glycerol, shea butter essential oil, pullulan, Tween-80 and calcium chloride prepared in Example 1 were added, wherein the amount ratio of chitosan, microcapsules, glycerol, shea butter essential oil, pullulan, Tween-80 and calcium chloride was 2.1g:1g:1.4g:0.25mL:0.45g:0.14g:0.28g, and the composite membrane liquid containing microcapsules was obtained by homogenizing at 11000r / min for 4.5min.
[0039] Example 10 A composite membrane liquid containing microcapsules 5kg chitosan was dissolved in 1wt% acetic acid solution to prepare a chitosan solution with a volume fraction of 2%, and stirred until completely dissolved. The microcapsules, glycerol, shea butter essential oil, pullulan, Tween-80 and calcium chloride prepared in Example 1 were added, wherein the amount ratio of chitosan, microcapsules, glycerol, shea butter essential oil, pullulan, Tween-80 and calcium chloride was 2.2g:1g:1.5g:0.3mL:0.5g:0.15g:0.3g, and the composite membrane liquid containing microcapsules was obtained by homogenizing at 12000r / min for 5min.
[0040] Comparative Example 5 A composite membrane liquid containing microcapsules, compared with Example 8, using chitosan of equal mass to replace shea butter essential oil, Embodiment 11 A maintenance type sanitary napkin is prepared by the following preparation method: The composite membrane liquid prepared in Example 6 was degassed in a defoaming barrel for 1.5 hours, and then sprayed on the surface of the non-woven fabric by a spraying method. After spraying, it entered the setting machine for drying and baking to obtain a non-woven fabric made of the composite membrane liquid containing microcapsules, and the film layer on the non-woven fabric was controlled to be 0.04~0.05mm.
[0041] The non-woven fabric made of composite membrane liquid containing microcapsules is used as the surface layer, and is pressed together with the absorption layer and the bottom layer to obtain a maintenance type sanitary napkin.
[0042] Example 12 A maintenance type sanitary napkin is prepared by the following preparation method: The composite membrane liquid prepared in Example 6 was degassed in a defoaming barrel for 1.6 hours, and then sprayed on the surface of the non-woven fabric by a spraying method. After spraying, it entered the setting machine for drying and baking to obtain a non-woven fabric made of the composite membrane liquid containing microcapsules, and the film layer on the non-woven fabric was controlled to be 0.04~0.05mm.
[0043] The non-woven fabric made of composite membrane liquid containing microcapsules is used as the surface layer, and is pressed together with the absorption layer and the bottom layer to obtain a maintenance type sanitary napkin.
[0044] Embodiment 13 A maintenance type sanitary napkin is prepared by the following preparation method: The composite membrane liquid prepared in Example 6 was degassed in a defoaming barrel for 1.7 hours, and then sprayed on the surface of the non-woven fabric by a spraying method. After spraying, it entered the setting machine for drying and baking to obtain a non-woven fabric made of the composite membrane liquid containing microcapsules, and the film layer on the non-woven fabric was controlled to be 0.04~0.05mm.
[0045] The non-woven fabric made of composite membrane liquid containing microcapsules is used as the surface layer, and is pressed together with the absorption layer and the bottom layer to obtain a maintenance type sanitary napkin.
[0046] Embodiment 14 A maintenance type sanitary napkin is prepared by the following preparation method: The composite membrane liquid prepared in Example 6 was degassed in a defoaming barrel for 1.8 hours, and then sprayed on the surface of the non-woven fabric by a spraying method. After spraying, it entered the setting machine for drying and baking to obtain a non-woven fabric made of the composite membrane liquid containing microcapsules, and the film layer on the non-woven fabric was controlled to be 0.04~0.05mm.
[0047] The non-woven fabric made of composite membrane liquid containing microcapsules is used as the surface layer, and is pressed together with the absorption layer and the bottom layer to obtain a maintenance type sanitary napkin.
[0048] Embodiment 15 A maintenance type sanitary napkin is prepared by the following preparation method: The composite membrane liquid prepared in Example 6 was degassed in a defoaming barrel for 2 hours, and then sprayed on the surface of the non-woven fabric by a spraying method. After spraying, it entered the setting machine for drying and baking to obtain a non-woven fabric made of the composite membrane liquid containing microcapsules, and the film layer on the non-woven fabric was controlled to be 0.04~0.05mm.
[0049] The non-woven fabric made of composite membrane liquid containing microcapsules is used as the surface layer, and is pressed together with the absorption layer and the bottom layer to obtain a maintenance type sanitary napkin.
[0050] 10 mL of the composite membrane liquid prepared in Examples 6 to 10 and Comparative Example 5 were respectively poured into a 90 mm culture dish, dried at 40° C. for 8 h, and after cooling, the formed composite membrane was equilibrated at a constant temperature (25.0+0.5)° C. and constant humidity (relative humidity 53%) for 16 h for use.
[0051] The composite films prepared in Examples 6 to 10 and Comparative Example 5 were tested as follows: Test Example 2 Determination of water absorption The water absorption rate was determined according to the reference (NORDIN N, OTHMAN SH, RASHID SA, et al. Effects of glveerl and thymol on physical, mechanical, and theral properties of cornstarch films J. Food Hydmeolloids, 2020.106: 105884) and the results are shown in Table 2.
[0052] Test Example 3 Water Vapor Permeability Coefficient Water vapor permeability coefficient (LOMBO VIDAL, O, TSUKUI A, GARRETT R, et al. Prduetionofbioactive films of carboxymethyl cellulose enriched with green cof-fee oiland its residuesJ, International Journal of Biological Macromolecules, 2020,146:730-738.) was determined by method. The results are shown in Table 2.
[0053] Table 2 It can be seen from Table 2 that the water absorption rate of the composite film layer prepared in Examples 6 to 10 of the present invention is significantly improved compared with 368.03% of Comparative Example 5 (all >375%), and the water vapor permeability coefficient of the composite film layer prepared in Examples 6 to 10 is significantly improved compared with 0.52 of Comparative Example 5 (all >0.65). It can be seen that the composite film layer prepared in Examples 6 to 10 has better water absorption and air permeability, and is more suitable for the use environment of sanitary napkins.
[0054] The above is only an implementation method of the invention, and does not limit the scope of patent protection. Those skilled in the art can make non-substantial changes or substitutions based on the invention, which still fall within the scope of patent protection.
Claims
1. A maintenance sanitary napkin, characterized in that: It comprises a surface layer, an absorption layer and a bottom layer, wherein the surface layer is a non-woven fabric with microcapsules attached thereto; The preparation method of the microcapsules comprises the following operations: Configuration of modified chitosan: Chitosan, isopropanol and glycidyl trimethylammonium chloride are reacted, alcohol precipitation and alcohol washing are performed to obtain a crude product, and the crude product is dissolved, dialyzed and dried to obtain modified chitosan; Preparation of microcapsules: The modified chitosan and chitosan are mixed to prepare composite chitosan, and the composite chitosan is dissolved in acetic acid solution to prepare a composite chitosan solution; Dissolve sodium carboxymethyl starch in distilled water to prepare sodium carboxymethyl starch solution; The composite chitosan solution, sodium carboxymethyl starch solution and pullulan are mixed to obtain a prefabricated liquid, microcapsule core materials are added to the prefabricated liquid while being homogenized to obtain a prefabricated mixed liquid, and the prefabricated mixed liquid is freeze-dried to obtain microcapsule powder.
2. The maintenance sanitary napkin according to claim 1, characterized in that: The microcapsule core material includes shea butter essential oil.
3. The maintenance sanitary napkin according to claim 2, characterized in that: The surface layer is a non-woven fabric with microcapsules attached thereto. Specifically, the microcapsules are made into a composite membrane liquid containing microcapsules, and the composite membrane liquid is sprayed on the surface of the non-woven fabric by a spraying method; the raw materials of the composite membrane liquid include chitosan, microcapsules, shea butter essential oil, and pullulan in a mass ratio of 1.8-2.2g: 1g: 0.1-0.3mL: 0.3-0.5g.
4. A method for preparing the maintenance sanitary napkin according to claim 3, characterized in that: The following operations are included: preparing microcapsules; Preparing a composite membrane solution containing microcapsules; The composite film liquid is sprayed on the surface of the non-woven fabric by a spraying method, and then the non-woven fabric is used as the surface layer, and the absorption layer and the bottom layer are pressed together to obtain a maintenance type sanitary napkin.
5. The preparation method according to claim 4, characterized in that: The glycidyl trimethyl ammonium chloride in the modified chitosan is added in the form of a 20wt% glycidyl trimethyl ammonium chloride solution; the dosage ratio of the isopropanol, chitosan and the 20wt% glycidyl trimethyl ammonium chloride solution is 8-12mL:1g:6-10mL.
6. The preparation method according to claim 4, characterized in that: In the preparation of microcapsules, modified chitosan and chitosan are mixed in a mass ratio of 1:5-9 to obtain composite chitosan.
7. The preparation method according to claim 4, characterized in that: The volume ratio of the composite chitosan solution and the sodium carboxymethyl starch solution in preparing the microcapsules is 3-5:3, and the mass concentration ratio is 1:
1.
8. The preparation method according to claim 4, characterized in that: The pullulan content in the prefabricated solution is 1.5-2wt%.
9. The preparation method according to claim 4, characterized in that: The mass ratio of shea butter essential oil to sodium carboxymethyl starch in preparing microcapsules is 1 / 4-8.
10. The preparation method according to claim 4, characterized in that: The freeze-drying of the pre-made mixed solution in the preparation of microcapsules is specifically as follows: cooling the pre-made mixed solution to -100~-80°C, and then vacuum freeze-drying it.