Diaper suitable for use during menstruation

Abstract

The present invention relates to the technical field of diapers, specifically a diaper suitable for use during menstruation. The diaper comprises, from top to bottom, a porous permeable layer, an intermediate layer, and a breathable base film layer; the intermediate layer comprises an upper layer, a composite core, and a lower layer; and the composite core comprises a deodorizing and antibacterial hydrogel freeze-dried material. The present invention can effectively decompose blood and blood clots, reduce menstrual blood viscosity, accelerate the downward permeation rate of menstrual blood, and thereby promote its absorption. The deodorizing and antibacterial hydrogel freeze-dried material enhances water absorption, breathability, antibacterial properties, and deodorizing properties, thereby improving the comfort of the diaper, eliminating the feeling of stuffiness and dampness, and effectively meeting the care requirements for women facing incontinence during their menstrual cycle.

Description

Technical Field

[0001] The present invention relates to the technical field of diapers, and in particular to a diaper suitable for use during menstruation. Background Art

[0002] Diapers are increasingly popular among consumers due to their disposable, lightweight, and convenient features, and have gradually become a staple of adult care products. However, current diapers only absorb urine and not blood clots during menstruation. This can cause discomfort for female users due to blood clots not being absorbed. Furthermore, some women still experiencing menstruation may experience incontinence, and existing adult diapers fail to meet these safety, comfort, and blood clot absorption requirements.

[0003] For example, Chinese invention patent publication number CN 103976825 A discloses antibacterial and deodorizing diapers comprising a base film and an absorbent member located in the middle of the base film. The absorbent member and base film are bonded together using structural adhesive. The absorbent member comprises a large cotton core, a small cotton core, and a non-woven fabric, all bonded together using structural adhesive. These diapers are suitable for incontinent patients, such as those with severe illnesses and those who are bedridden for long periods. However, these diapers can only absorb urine and cannot absorb blood clots during menstruation, making them inadequate for the care of incontinence experienced by women during their menstrual cycles. Summary of the Invention

[0004] In order to solve the problem that existing adult diapers cannot meet the requirements in terms of safety, comfort, blood clot absorption, etc., the present invention provides a diaper suitable for use during menstruation, which can absorb blood clots well while absorbing urine, has a high liquid absorption speed, and can ensure comfort and dryness.

[0005] The specific technical solution of the present invention is: the present invention provides a diaper suitable for use during menstruation, the diaper comprising a porous permeable layer, an intermediate layer and a breathable bottom film layer from top to bottom; the intermediate layer comprises an upper layer, a composite core and a lower layer; the composite core comprises a deodorizing and antibacterial hydrogel freeze-dried material.

[0006] Current diapers can only absorb urine but not blood clots during menstruation, which causes the blood clots to not be absorbed during use, causing discomfort to the user. The present invention modifies the structure of diapers to meet the care requirements for women who are still in their menstrual cycle and face incontinence. Replacing the surface layer of the diaper with a porous permeable layer with a larger pore size allows menstrual blood to diffuse downward better and not stay on the surface layer. At the same time, the core structure adopts a composite core, and the deodorizing and antibacterial hydrogel freeze-dried material can absorb odors and deodorize, and also has a good antibacterial effect, making the user more comfortable and not feeling stuffy or uncomfortable during menstruation. The bottom is a breathable base film to reduce the stuffiness generated by the user when in use.

[0007] Preferably, the porous permeable layer is a PE film, and the porous pore diameter is 0.4 to 0.6 mm.

[0008] Preferably, the upper layer is an antibacterial non-woven fabric impregnated with blood decomposition and absorption liquid; the raw materials of the blood decomposition and absorption liquid include, by weight: 1 to 3 parts of aloe vera, 0.1 to 0.5 parts of protease, 0.1 to 0.5 parts of menthol, 0.1 to 0.5 parts of witch hazel, and 1 to 5 parts of water.

[0009] The upper layer can effectively decompose blood and blood clots, reduce the viscosity of menstrual blood, accelerate the downward penetration speed of menstrual blood, and thus promote its absorption in the composite core.

[0010] Preferably, the lower layer is an antibacterial non-woven fabric wrapped with a polymer water-absorbing resin SAP.

[0011] Preferably, the composite core is a sealed bag formed by hot pressing two layers of non-woven fabrics and the deodorizing and antibacterial hydrogel freeze-dried material filled in the sealed bag.

[0012] Preferably, the preparation method of the deodorizing and antibacterial hydrogel freeze-dried material comprises the following steps:

[0013] (1) dispersing the yucca extract in water, adding plant essential oil and mixing, then adding maleic anhydride and concentrated sulfuric acid, heating and reacting to obtain a yucca extract solution;

[0014] (2) dissolving chitosan quaternary ammonium salt in acetic acid solution to obtain chitosan quaternary ammonium salt solution;

[0015] (3) adding the yucca extract solution to the chitosan quaternary ammonium salt solution, stirring, and adding a pH regulator to control the pH to 6 to 7 to obtain a mixed solution;

[0016] (4) Add the mixed solution dropwise to the polyvinyl alcohol solution, heat to 45-50°C and stir for 1-3 hours, then add acrylamide, vinyl pyrrolidone, dicumyl peroxide, potassium persulfate and acetone, heat to reflux for 3-5 hours, distill under reduced pressure, and then stand under vacuum for 24-30 hours;

[0017] (5) After filtering the product obtained in step (4), immersing it in a tourmaline powder emulsion, then taking it out, freeze-drying it, and crushing it to obtain a deodorizing and antibacterial hydrogel freeze-dried material.

[0018] Diapers often have peculiar smells during use, which will increase the user's discomfort if not removed in time. Yucca extract can suppress the decomposition of urea in urine, avoiding the generation of peculiar smells from the source, and the volatility characteristics of plant essential oils have a good deodorizing effect for urine and menstrual blood. However, plant essential oils easily produce volatility losses before diapers are used. The present invention utilizes microcapsule technology to embed plant essential oils in a polymer film made from yucca extract and chitosan quaternary ammonium salt, and electrostatic interaction is carried out by the negatively charged carboxyl group in the yucca extract modified by maleic anhydride and the positively charged quaternary ammonium group in the chitosan quaternary ammonium salt. Microcapsules are condensed on the plant extract surface, and polyvinyl alcohol is added afterwards to form a hydrogel while improving the binding tightness of the microcapsules. The addition of acrylamide and vinylpyrrolidone can promote the double crosslinking of the hydrogel, and the network crosslinked structure can, while improving water absorption, enhance the barrier properties to urine or menstrual blood.

[0019] Furthermore, crushing the freeze-dried hydrogel into a freeze-dried powder can enhance its absorption of urine or menstrual blood. Yucca schidigera extract contains both water-soluble and fat-soluble groups, allowing it to bind well to plant essential oils. Furthermore, the microcapsules dissolve and release the essential oils during diaper use, slowing their release and improving durability. Immersing the diaper in a tourmaline powder emulsion can load negative ions, imparting antibacterial properties. Therefore, the addition of this deodorizing and antibacterial hydrogel freeze-dried material can enhance the absorbency, breathability, antibacterial properties, and deodorizing properties of diapers.

[0020] Preferably, in step (1), the plant essential oil is one or more of lavender essential oil, peppermint essential oil, rose essential oil, lemon essential oil, and tea tree essential oil; the mass ratio of the yucca extract, the plant essential oil, and maleic anhydride is 1:0.3-0.5:1-3; the mass concentration of the yucca extract in the yucca extract solution is 1.2-1.4%; and in step (2), the mass concentration of the chitosan quaternary ammonium salt in the chitosan quaternary ammonium salt solution is 1-1.2%.

[0021] Preferably, in step (3), the mass ratio of the yucca extract solution to the chitosan quaternary ammonium salt solution is 1.5-2:1; in step (4), the mass ratio of the mixed solution to the polyvinyl alcohol solution is 1:2-3; the concentration of the polyvinyl alcohol solution is 0.1-0.2 g / mL; the mass ratio of the polyvinyl alcohol, acrylamide, vinylpyrrolidone, dicumyl peroxide and potassium persulfate is 5-10:2:1:0.1-0.2:0.1-0.2.

[0022] The deodorizing and antibacterial hydrogel freeze-dried material provides support and water absorption by coating microcapsules with hydrogel, so the ratio of raw materials is particularly important for the coating effect.

[0023] Preferably, the breathable bottom film layer is a PE waterproof breathable film.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) It can effectively break down blood and blood clots, reduce the viscosity of menstrual blood, and accelerate the downward penetration of menstrual blood, thereby promoting its absorption;

[0026] (2) The deodorizing and antibacterial hydrogel freeze-dried material can enhance the water absorption, breathability, antibacterial and deodorizing properties of diapers;

[0027] (3) The diaper is highly comfortable, does not feel stuffy or damp, is safe, and has a good function of inhibiting the growth of bacteria and fungi. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the embodiments.

[0029] Overall embodiment

[0030] A diaper suitable for use during menstruation, comprising, from top to bottom, a porous permeable layer, an intermediate layer, and a breathable base film layer. The porous permeable layer is a PE film with a pore diameter of 0.4 to 0.6 mm. The intermediate layer comprises an upper layer, a composite core, and a lower layer. The upper layer is an antibacterial nonwoven fabric impregnated with a blood decomposition and absorption liquid. The raw materials of the blood decomposition and absorption liquid include, by weight, 1 to 3 parts aloe vera, 0.1 to 0.5 parts protease, 0.1 to 0.5 parts menthol, 0.1 to 0.5 parts witch hazel, and 1 to 5 parts water. The lower layer is an antibacterial nonwoven fabric wrapped in a polymer absorbent resin (SAP). The composite core is a sealed bag formed by hot-pressing two layers of nonwoven fabric, filled with a freeze-dried deodorizing and antibacterial hydrogel material. The breathable base film layer is a waterproof and breathable PE film.

[0031] The preparation method of the deodorizing and antibacterial hydrogel freeze-dried material comprises the following steps:

[0032] (1) Dispersing yucca extract in water, adding plant essential oil and mixing, then adding maleic anhydride and concentrated sulfuric acid, heating and reacting to obtain a yucca extract solution (the mass concentration of the yucca extract is 1.2-1.4%); the mass ratio of the yucca extract, the plant essential oil, and the maleic anhydride is 1:0.3-0.5:1-3; the plant essential oil is one or more of lavender essential oil, peppermint essential oil, rose essential oil, lemon essential oil, and tea tree essential oil;

[0033] (2) dissolving chitosan quaternary ammonium salt in acetic acid solution to obtain a chitosan quaternary ammonium salt solution with a mass concentration of 1 to 1.2%;

[0034] (3) adding the yucca extract solution to the chitosan quaternary ammonium salt solution, wherein the mass ratio of the yucca extract solution to the chitosan quaternary ammonium salt solution is 1.5 to 2:1; stirring and adding a pH regulator to control the pH to 6 to 7 to obtain a mixed solution;

[0035] (4) adding the mixed solution dropwise to a polyvinyl alcohol solution having a concentration of 0.1 to 0.2 g / mL, wherein the mass ratio of the mixed solution to the polyvinyl alcohol solution is 1:2 to 3, heating to 45 to 50° C. and stirring for 1 to 3 hours, then adding acrylamide, vinyl pyrrolidone, dicumyl peroxide, potassium persulfate and acetone, wherein the mass ratio of the polyvinyl alcohol, acrylamide, vinyl pyrrolidone, dicumyl peroxide and potassium persulfate is 5 to 10:2:1:0.1 to 0.2:0.1 to 0.2, heating to reflux reaction for 3 to 5 hours, distilling under reduced pressure, and then standing under vacuum for 24 to 30 hours;

[0036] (5) After filtering the product obtained in step (4), immersing it in a tourmaline powder emulsion, then taking it out, freeze-drying it, and crushing it to obtain a deodorizing and antibacterial hydrogel freeze-dried material.

[0037] Example 1

[0038] A diaper suitable for use during menstruation, comprising, from top to bottom, a porous permeable layer (PE film, pore diameter 0.5mm), an intermediate layer, and a breathable bottom film layer (PE waterproof and breathable film). The intermediate layer comprises an upper layer, a composite core, and a lower layer. The upper layer is an antibacterial non-woven fabric impregnated with a blood decomposition and absorption liquid. The raw materials of the blood decomposition and absorption liquid include, by weight, 1 part aloe vera, 0.2 part protease, 0.1 part menthol, 0.2 part witch hazel, and 3 parts water. The lower layer is an antibacterial non-woven fabric wrapped in a polymer water-absorbing resin SAP. The composite core is a sealed bag formed by hot-pressing two layers of non-woven fabric and filled with a deodorizing and antibacterial hydrogel freeze-dried material.

[0039] The preparation method of the deodorizing and antibacterial hydrogel freeze-dried material comprises the following steps:

[0040] (1) Disperse the yucca extract in water, add plant essential oils (lavender essential oil and tea tree essential oil) and mix and stir, then add maleic anhydride and concentrated sulfuric acid, wherein the mass ratio of yucca extract, plant essential oil, maleic anhydride and concentrated sulfuric acid is 1:0.4:2:0.05, heat and react at 55°C for 2h to obtain a yucca extract solution (the mass concentration of the yucca extract is 1.25%).

[0041] (2) dissolving chitosan quaternary ammonium salt in acetic acid solution to obtain a chitosan quaternary ammonium salt solution with a mass concentration of 1.1%; (3) adding the yucca extract solution to the chitosan quaternary ammonium salt solution at a mass ratio of 2:1; stirring and adding a pH regulator to control the pH to 6-7 to obtain a mixed solution;

[0042] (4) The mixed solution was added dropwise to a polyvinyl alcohol solution with a concentration of 0.2 g / mL, with a mass ratio of the mixed solution to the polyvinyl alcohol solution of 1:3. The mixture was heated to 50°C and stirred for 2.5 h. Acrylamide, vinyl pyrrolidone, dicumyl peroxide, potassium persulfate and acetone were then added to make the mass volume ratio of polyvinyl alcohol, acrylamide, vinyl pyrrolidone, dicumyl peroxide, potassium persulfate and acetone 6 g:2 g:1 g:0.1 g:0.1 g:10 mL. The mixture was heated to reflux for 4 h, and distilled under reduced pressure. The mixture was then allowed to stand under vacuum for 30 h.

[0043] (5) After filtering the product obtained in step (4), immersing it in a 15% mass concentration tourmaline powder emulsion for 10 minutes, then taking it out, freeze-drying it, and crushing it to obtain a deodorizing and antibacterial hydrogel freeze-dried material.

[0044] Example 2

[0045] A diaper suitable for use during menstruation, comprising, from top to bottom, a porous permeable layer (PE film, pore diameter 0.5mm), an intermediate layer, and a breathable bottom film layer (PE waterproof and breathable film). The intermediate layer comprises an upper layer, a composite core, and a lower layer. The upper layer is an antibacterial non-woven fabric impregnated with a blood decomposition and absorption liquid. The raw materials of the blood decomposition and absorption liquid include, by weight, 2 parts aloe vera, 0.2 parts protease, 0.2 parts menthol, 0.1 parts witch hazel, and 4 parts water. The lower layer is an antibacterial non-woven fabric wrapped in a polymer water-absorbing resin SAP. The composite core is a sealed bag formed by hot-pressing two layers of non-woven fabric and filled with a deodorizing and antibacterial hydrogel freeze-dried material.

[0046] The preparation method of the deodorizing and antibacterial hydrogel freeze-dried material comprises the following steps:

[0047] (1) Disperse the yucca extract in water, add plant essential oils (lavender essential oil and tea tree essential oil) and mix and stir, then add maleic anhydride and concentrated sulfuric acid, wherein the mass ratio of yucca extract, plant essential oil, maleic anhydride and concentrated sulfuric acid is 1:0.3:2:0.05, heat and react at 55°C for 2h to obtain a yucca extract solution (the mass concentration of the yucca extract is 1.25%).

[0048] (2) dissolving chitosan quaternary ammonium salt in acetic acid solution to obtain a chitosan quaternary ammonium salt solution with a mass concentration of 1.1%; (3) adding the yucca extract solution to the chitosan quaternary ammonium salt solution at a mass ratio of 1.5:1; stirring and adding a pH regulator to control the pH to 6-7 to obtain a mixed solution;

[0049] (4) The mixed solution was added dropwise to a polyvinyl alcohol solution with a concentration of 0.2 g / mL, with a mass ratio of the mixed solution to the polyvinyl alcohol solution of 1:3. The mixture was heated to 50°C and stirred for 2.5 h. Acrylamide, vinyl pyrrolidone, dicumyl peroxide, potassium persulfate and acetone were then added to make the mass volume ratio of polyvinyl alcohol, acrylamide, vinyl pyrrolidone, dicumyl peroxide, potassium persulfate and acetone 10 g:2 g:1 g:0.1 g:0.1 g:10 mL. The mixture was heated to reflux for 4 h, distilled under reduced pressure, and then allowed to stand under vacuum for 30 h.

[0050] (5) After filtering the product obtained in step (4), immersing it in a 15% mass concentration tourmaline powder emulsion for 10 minutes, then taking it out, freeze-drying it, and crushing it to obtain a deodorizing and antibacterial hydrogel freeze-dried material.

[0051] Example 3

[0052] A diaper suitable for use during menstruation, comprising, from top to bottom, a porous permeable layer (PE film, pore diameter 0.5mm), an intermediate layer, and a breathable bottom film layer (PE waterproof and breathable film). The intermediate layer comprises an upper layer, a composite core, and a lower layer. The upper layer is an antibacterial non-woven fabric impregnated with a blood decomposition and absorption liquid. The raw materials of the blood decomposition and absorption liquid include, by weight, 1 part aloe vera, 0.2 part protease, 0.1 part menthol, 0.2 part witch hazel, and 3 parts water. The lower layer is an antibacterial non-woven fabric wrapped in a polymer water-absorbing resin SAP. The composite core is a sealed bag formed by hot-pressing two layers of non-woven fabric and filled with a deodorizing and antibacterial hydrogel freeze-dried material.

[0053] The preparation method of the deodorizing and antibacterial hydrogel freeze-dried material comprises the following steps:

[0054] (1) Dispersing the yucca extract in water, adding plant essential oils (lavender essential oil and tea tree essential oil) and mixing, then adding maleic anhydride and concentrated sulfuric acid, heating to react, wherein the mass ratio of the yucca extract, the plant essential oil, maleic anhydride and concentrated sulfuric acid is 1:0.5:3:0.05, and obtaining a yucca extract solution (the mass concentration of the yucca extract is 1.3%).

[0055] (2) dissolving chitosan quaternary ammonium salt in acetic acid solution to obtain a chitosan quaternary ammonium salt solution with a mass concentration of 1.2%; (3) adding yucca extract solution to the chitosan quaternary ammonium salt solution, wherein the mass ratio of the yucca extract solution to the chitosan quaternary ammonium salt solution is 1.5:1; stirring and adding a pH regulator to control the pH to 6-7 to obtain a mixed solution;

[0056] (4) The mixed solution was added dropwise to a polyvinyl alcohol solution with a concentration of 0.2 g / mL, the mass ratio of the mixed solution to the polyvinyl alcohol solution was 1:2, and the mixture was heated to 45°C and stirred for 3 h. Then, acrylamide, vinyl pyrrolidone, dicumyl peroxide, potassium persulfate and acetone were added, and the mass volume ratio of the polyvinyl alcohol, acrylamide, vinyl pyrrolidone, dicumyl peroxide, potassium persulfate and acetone was 5 g:2 g:1 g:0.1 g:0.1 g:10 mL. The mixture was heated to reflux for 5 h, and the mixture was distilled under reduced pressure, and then allowed to stand under vacuum for 30 h.

[0057] (5) After filtering the product obtained in step (4), immersing it in a 15% mass concentration tourmaline powder emulsion for 10 minutes, then taking it out, freeze-drying it, and crushing it to obtain a deodorizing and antibacterial hydrogel freeze-dried material.

[0058] Comparative Example 1

[0059] The difference from Example 1 is that no yucca extract is added.

[0060] The preparation method of the deodorizing and antibacterial hydrogel freeze-dried material comprises the following steps:

[0061] (1) Plant essential oils (lavender essential oil and tea tree essential oil) were added to water to obtain a plant essential oil solution (mass concentration of 0.5%).

[0062] (2) dissolving chitosan quaternary ammonium salt in acetic acid solution to obtain a chitosan quaternary ammonium salt solution with a mass concentration of 1.1%; (3) adding the plant essential oil solution to the chitosan quaternary ammonium salt solution at a solution mass ratio of 2:1; stirring and adding a pH regulator to control the pH to 6-7 to obtain a mixed solution;

[0063] (4) The mixed solution was added dropwise to a polyvinyl alcohol solution with a concentration of 0.2 g / mL, with a mass ratio of the mixed solution to the polyvinyl alcohol solution of 1:3. The mixture was heated to 50°C and stirred for 2.5 h. Acrylamide, vinyl pyrrolidone, dicumyl peroxide, potassium persulfate and acetone were then added to make the mass volume ratio of polyvinyl alcohol, acrylamide, vinyl pyrrolidone, dicumyl peroxide, potassium persulfate and acetone 6 g:2 g:1 g:0.1 g:0.1 g:10 mL. The mixture was heated to reflux for 4 h, and distilled under reduced pressure. The mixture was then allowed to stand under vacuum for 30 h.

[0064] (5) After filtering the product obtained in step (4), immersing it in a 15% mass concentration tourmaline powder emulsion for 10 minutes, then taking it out, freeze-drying it, and crushing it to obtain a deodorizing and antibacterial hydrogel freeze-dried material.

[0065] Comparative Example 2

[0066] The difference from Example 1 is that chitosan quaternary ammonium salt is not added.

[0067] The preparation method of the deodorizing and antibacterial hydrogel freeze-dried material comprises the following steps:

[0068] (1) Disperse the yucca extract in water, add plant essential oils (lavender essential oil and tea tree essential oil) and mix and stir, then add maleic anhydride and concentrated sulfuric acid, wherein the mass ratio of yucca extract, plant essential oil, maleic anhydride and concentrated sulfuric acid is 1:0.4:2:0.05, heat and react at 55°C for 2h to obtain a yucca extract solution (the mass concentration of the yucca extract is 1.25%).

[0069] (2) stirring the yucca extract solution and adding a pH regulator to control the pH to 6 to 7 to obtain a mixed solution;

[0070] (3) The mixed solution was added dropwise to a polyvinyl alcohol solution with a concentration of 0.2 g / mL, with a mass ratio of the mixed solution to the polyvinyl alcohol solution of 1:3. The mixture was heated to 50°C and stirred for 2.5 h. Acrylamide, vinyl pyrrolidone, dicumyl peroxide, potassium persulfate and acetone were then added to make the mass volume ratio of polyvinyl alcohol, acrylamide, vinyl pyrrolidone, dicumyl peroxide, potassium persulfate and acetone 6 g:2 g:1 g:0.1 g:0.1 g:10 mL. The mixture was heated to reflux for 4 h, distilled under reduced pressure, and then allowed to stand under vacuum for 30 h.

[0071] (4) After filtering the product obtained in step (3), immersing it in a 15% mass concentration tourmaline powder emulsion for 10 minutes, then taking it out, freeze-drying it, and crushing it to obtain a deodorizing and antibacterial hydrogel freeze-dried material.

[0072] Comparative Example 3

[0073] The difference from Example 1 is that no hydrogel is formed.

[0074] The preparation method of the deodorizing and antibacterial material comprises the following steps:

[0075] (1) Disperse the yucca extract in water, add plant essential oils (lavender essential oil and tea tree essential oil) and mix and stir, then add maleic anhydride and concentrated sulfuric acid, wherein the mass ratio of yucca extract, plant essential oil, maleic anhydride and concentrated sulfuric acid is 1:0.4:2:0.05, heat and react at 55°C for 2h to obtain a yucca extract solution (the mass concentration of the yucca extract is 1.25%).

[0076] (2) dissolving chitosan quaternary ammonium salt in acetic acid solution to obtain a chitosan quaternary ammonium salt solution with a mass concentration of 1.1%; (3) adding the yucca extract solution to the chitosan quaternary ammonium salt solution at a mass ratio of 2:1; stirring and adding a pH regulator to control the pH to 6-7 to obtain a mixed solution;

[0077] (4) The mixed solution was added dropwise into a 4% polyvinyl alcohol solution, wherein the mass ratio of the mixed solution to the polyvinyl alcohol solution was 1:1, stirred for 40 minutes, and then heated to 45°C. The reaction was stirred at the constant temperature for 2 hours. After filtering, the product was washed with deionized water and vacuum dried at 55°C for 10 hours.

[0078] (5) Immersing the product obtained in step (4) in a tourmaline powder emulsion having a mass concentration of 15% for 10 minutes, and then taking it out and drying it to obtain a deodorizing and antibacterial material.

[0079] Comparative Example 4

[0080] The difference from Example 1 is that acrylamide and vinyl pyrrolidone are not added.

[0081] The preparation method of the deodorizing and antibacterial hydrogel freeze-dried material comprises the following steps:

[0082] (1) Disperse the yucca extract in water, add plant essential oils (lavender essential oil and tea tree essential oil) and mix and stir, then add maleic anhydride and concentrated sulfuric acid, wherein the mass ratio of yucca extract, plant essential oil, maleic anhydride and concentrated sulfuric acid is 1:0.4:2:0.05, heat and react at 55°C for 2h to obtain a yucca extract solution (the mass concentration of the yucca extract is 1.25%).

[0083] (2) dissolving chitosan quaternary ammonium salt in acetic acid solution to obtain a chitosan quaternary ammonium salt solution with a mass concentration of 1.1%; (3) adding the yucca extract solution to the chitosan quaternary ammonium salt solution at a mass ratio of 2:1; stirring and adding a pH regulator to control the pH to 6-7 to obtain a mixed solution;

[0084] (4) The mixed solution was added dropwise into a polyvinyl alcohol solution with a concentration of 0.3 g / mL, wherein the mass ratio of the mixed solution to the polyvinyl alcohol solution was 1:3, heated to 50 °C and stirred for 3 h, and then allowed to stand under vacuum for 2 days;

[0085] (5) After filtering the product obtained in step (4), immersing it in a 15% mass concentration tourmaline powder emulsion for 10 minutes, then taking it out, freeze-drying it, and crushing it to obtain a deodorizing and antibacterial hydrogel freeze-dried material.

[0086] Performance test: Water absorption rate: soak the diaper (middle layer only) completely in water, take it out after 1 minute and place it vertically for 90 seconds, weigh the sample before and after soaking, and calculate the water absorption rate.

[0087] Aroma release: The diapers were immersed in artificial urine (Qingdao Jieshikang Biotechnology Co., Ltd.) with a pH of 4.7 for 1 h and 2 h, and the aroma release was measured.

[0088] Bactericidal performance: The bactericidal performance of diapers was tested according to the method in GB 15979-2002.

[0089] Table 1

[0090]

[0091] As shown in Table 1, the diapers of the present invention are highly comfortable, highly absorbent, and free of stuffiness and dampness. They also exhibit excellent bacterial and fungal growth inhibition. In Comparative Examples 1 and 2, no microcapsules were formed within the hydrogels. After the freeze-dried material absorbed water, the volatilization of the plant essential oils was accelerated. In particular, the absence of yucca extract resulted in poor binding and increased volatility of the plant essential oils. In Comparative Example 3, no hydrogel formed, resulting in poor water absorption. In Comparative Example 4, the absence of acrylamide and vinylpyrrolidone prevented the formation of a double-crosslinked network structure, impairing microcapsule encapsulation and the ability to delay aroma release.

[0092] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural transformation made to the above embodiment based on the technical essence of the present invention still fall within the scope of protection of the technical solution of the present invention.

Claims

1. Application of a composite core in diapers suitable for use during menstruation, characterized in that: The diaper comprises, from top to bottom, a porous permeable layer, an intermediate layer, and a breathable bottom film layer. The intermediate layer comprises an upper layer, a composite core, and a lower layer. The composite core is a sealed bag formed by hot-pressing two layers of non-woven fabric, and the sealed bag is filled with a deodorizing and antibacterial hydrogel freeze-dried material. The preparation of the odor-removing and antibacterial hydrogel freeze-dried material comprises the following steps: (1) Dispersing the yucca extract in water, adding plant essential oil and mixing, then adding maleic anhydride and concentrated sulfuric acid, the mass ratio of yucca extract, plant essential oil and maleic anhydride being 1:0.3-0.5:1-3, heating and reacting to obtain a yucca extract solution; (2) dissolving chitosan quaternary ammonium salt in acetic acid solution to obtain chitosan quaternary ammonium salt solution; (3) adding the yucca extract solution to the chitosan quaternary ammonium salt solution, wherein the mass percentage concentration of the yucca extract in the yucca extract solution is 1.2-1.4%, the mass percentage concentration of the chitosan quaternary ammonium salt in the chitosan quaternary ammonium salt solution is 1-1.2%, and the mass ratio of the yucca extract solution to the chitosan quaternary ammonium salt solution is 1.5-2:1, stirring and adding a pH regulator to control the pH to 6-7 to obtain a mixed solution; (4) Add the mixed solution dropwise to the polyvinyl alcohol solution, heat to 45-50 °C and stir for 1-3 h, then add acrylamide, vinyl pyrrolidone, dicumyl peroxide, potassium persulfate and acetone, the mass ratio of polyvinyl alcohol, acrylamide, vinyl pyrrolidone, dicumyl peroxide and potassium persulfate is 5-10:2:1:0.1-0.2:0.1-0.2, heat to reflux reaction for 3-5 h, distill under reduced pressure, and then stand under vacuum for 24-30 h; (5) The product obtained in step (4) is filtered and immersed in a tourmaline powder emulsion, and then taken out, freeze-dried, and crushed to obtain a deodorizing and antibacterial hydrogel freeze-dried material.

2. The use according to claim 1, characterized in that The porous permeable layer is a PE film, and the porous pore diameter is 0.4-0.6 mm.

3. The use according to claim 1, characterized in that The upper layer is an antibacterial nonwoven fabric impregnated with blood decomposition and absorption liquid; The raw materials of the blood decomposition and absorption liquid include, by weight, 1-3 parts of aloe vera, 0.1-0.5 parts of protease, 0.1-0.5 parts of menthol, 0.1-0.5 parts of witch hazel, and 1-5 parts of water.

4. The use according to claim 1 or 3, characterized in that The lower layer is an antibacterial non-woven fabric wrapped with a high molecular water-absorbing resin SAP.

5. The use according to claim 1, characterized in that In step (1), the plant essential oil is one or more of lavender essential oil, peppermint essential oil, rose essential oil, lemon essential oil, and tea tree essential oil.

6. The use according to claim 1, characterized in that In step (4), the mass ratio of the mixed solution to the polyvinyl alcohol solution is 1:2-3; the concentration of the polyvinyl alcohol solution is 0.1-0.2 g / mL.

7. The use according to claim 1, characterized in that The breathable bottom film layer is a PE waterproof breathable film.

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