Skin-friendly sanitary product based on flat fiber and preparation method thereof

Abstract

The present application relates to the field of preparation of sanitary products, and is a skin-friendly sanitary product based on flat fibers and a preparation method thereof. The skin-friendly sanitary product based on flat fibers comprises an ES flat fiber surface layer, a guide layer, a moisture-absorbing layer and a base film; the skin material of the ES flat fiber in the ES flat fiber surface layer comprises: PE, PHA, a compatibilizer, a carrier calcium carbide whisker, and a carrier nanocellulose; the preparation method is: melting the core layer to obtain a melt; PE, PHA, and a compatibilizer are mixed, and the carrier calcium carbide whiskers and the carrier nanocellulose are mixed, and melted to obtain a mixed material; after mixing the melt and the mixed material, spinning, bundling, stretching, heat setting, curling, and cutting to obtain ES flat fibers; ES fibers are woven into an ES flat fiber surface layer, and then the guide layer, the moisture-absorbing layer, and the base film are bonded in sequence by spraying glue, and the glue is dried and solidified to obtain a finished product; the product has the advantages of good skin-friendliness, high softness, high tensile strength and good moisture absorption.

Description

Technical Field

[0001] The present application relates to the field of preparation of sanitary products, and more particularly, to a skin-friendly sanitary product based on flat fibers and a preparation method thereof. Background Art

[0002] Hygiene products generally include sanitary napkins, sanitary pads, diapers for babies and the elderly, diapers (pads, paper), diaper pads, etc., which need to have good air permeability and moisture absorption.

[0003] The structure of diapers mainly includes the surface layer, the guide layer, the absorbent core, the bottom film and other parts. Since infants and young children are lively and active, the surface layer of diapers needs to have good tensile strength to avoid the diapers being broken and exposing the guide layer fibers, resins and other substances. Infants and young children have delicate skin, so the surface layer needs to be soft and skin-friendly to reduce skin friction irritation and protect the skin from friction scratches.

[0004] Therefore, how to prepare a sanitary product with good skin affinity, high softness, high tensile strength and good hygroscopicity is a problem to be solved. Summary of the Invention

[0005] In order to prepare a sanitary product with good skin-friendliness, high softness, high tensile strength and good hygroscopicity, the present application provides a skin-friendly sanitary product based on flat fibers and a preparation method thereof.

[0006] In a first aspect, the present application provides a skin-friendly sanitary product based on flat fibers, which adopts the following technical solution:

[0007] A skin-friendly sanitary product based on flat fibers, comprising an ES flat fiber surface layer, a flow-guiding layer, a moisture-absorbing layer, and a bottom film;

[0008] The ES flat fiber skin material in the ES flat fiber surface layer is made of the following raw materials in parts by weight: 80-100 parts of PE, 20-30 parts of PHA, 1-3 parts of a compatibilizer, 1-4 parts of calcium carbide whiskers as a carrier, and 1-3 parts of nanocellulose as a carrier;

[0009] The core material of ES flat fiber is PET core material.

[0010] By adopting the above technical solution, the diapers prepared by combining the ES flat fiber surface layer, the guide layer, the moisture-absorbing layer and the bottom film have good skin-friendliness and softness, and are not prone to allergies and skin friction; and have good moisture absorption effect and good tensile strength. After infants and young children put on the diapers, they are not prone to rupture or side leakage during exercise.

[0011] The double-layer structure of ES flat fibers can improve the water absorption and drainage effects of the diaper surface layer, thereby quickly absorbing liquid and being less prone to side leakage. In addition, PET has good toughness, which improves the structural stability and strength of the surface layer.

[0012] During the preparation of ES flat fibers, the good flexibility and durability of PE fibers are utilized to improve the flexibility of ES flat fibers, making them less prone to breakage or damage after movement or tearing. Combined with the good biocompatibility of PHA, it can balance the affinity of PE fibers to the skin, reduce the impact of the surface layer prepared from ES flat fibers on infant skin, and improve the skin-friendliness of the diaper surface layer to infant skin. Compatibilizers are used to improve the compatibility and bonding effect between PE, PHA, and fibers, increase the structural density of ES flat fibers, and thus improve the tensile strength, flexibility, and durability of ES flat fibers.

[0013] The combination of loaded calcium carbide whiskers and loaded nanocellulose, utilizing the tensile strength of calcium carbide whiskers and the good softness of cellulose fibers, is added to PE to improve the tensile strength and skin-friendly softness of ES flat fibers. The cellulose fibers can quickly recover their shape after stretching, further improving the tensile resistance of the surface layer. At the same time, it has good air permeability and moisture absorption, and can divert liquid while ensuring comfort.

[0014] Preferably, the loaded calcium carbide whiskers are prepared from calcium carbide whiskers, fucoidan solution and hydrophobic silica particles in a mass ratio of 1:0.1-0.2:0.1-0.15.

[0015] By adopting the above technical solution, calcium carbide whiskers, fucoidan solution, and hydrophobic silica gel particles are combined, and the bonding effect of the fucoidan solution is utilized to facilitate the adhesion of the hydrophobic silica gel particles to the surface of the calcium carbide whiskers. The hydrophobicity of the hydrophobic silica gel particles is utilized in combination with the hydrophilicity of fucoidan, and moisture can be quickly drained and migrated through the hydrophobic silica gel particles, making it difficult for moisture to accumulate on the surface layer, thereby ensuring the strength of the surface layer while ensuring the moisture diversion effect.

[0016] Calcium carbide whiskers, fucoidan solution, and hydrophobic silica gel particles are combined to improve the tensile strength of the surface layer by utilizing the better tensile strength of the hydrophobic silica gel particles, the tensile strength of the calcium carbide whiskers, and the adhesion stability of fucoidan. Even if the surface layer comes into contact with a large amount of water, it is not easily affected by the tensile strength of the surface layer, thus ensuring the tensile strength and durability of the diaper surface layer.

[0017] Fucoidan has good biocompatibility and combined with the soft touch of calcium carbide whiskers, it improves the skin-friendly effect of the ES flat fiber surface layer.

[0018] Preferably, the hydrophobic silica gel particles are prepared by treating silica gel particles with an aminosilane coupling agent.

[0019] By adopting the above technical solution, the silica gel particles are loaded with aminosilane coupling agents, and the amino groups of the amino groups are used to attract and connect with the hydroxyl groups in PHA, thereby improving the connection effect between the loaded calcium carbide whiskers and other raw materials. In addition, the aminosilane coupling agent on the surface of the silica gel particles can repel moisture and promote the diversion and penetration of moisture around the hydrophobic silica gel particles, so that the moisture can quickly reach the diversion layer and the moisture absorption layer, realizing the rapid drainage of moisture in the adhesive layer of the diaper. During the use of the diaper, the skin-friendly softness and comfort of the surface layer can be guaranteed.

[0020] Preferably, the loaded nanocellulose is prepared from nanocellulose, polyvinyl alcohol-1799 solution and hydrophobic molecular sieve particles in a mass ratio of 1:0.05-0.1:0.1-0.2.

[0021] By adopting the above technical scheme, nanocellulose, polyvinyl alcohol-1799 solution and hydrophobic molecular sieve particles are matched together, and the viscosity of polyvinyl alcohol-1799 solution is utilized to facilitate the adhesion of hydrophobic molecular sieve particles to the surface of nanocellulose. Polyvinyl alcohol-1799 is insoluble in water at room temperature, but dissolves at water temperatures above 95°C, thereby ensuring the adhesion stability of polyvinyl alcohol-1799 solution to hydrophobic molecular sieve particles on the surface of nanocellulose. Although polyvinyl alcohol-1799 has hydroxyl groups and is hydrophilic, the polyvinyl alcohol-1799 solution has a certain barrier effect on moisture after film formation, thereby controlling the nanocellulose from excessively absorbing water and affecting the air permeability of the surface layer and the comfort of contact with the skin. In addition, the temperature of human urine will not dissolve polyvinyl alcohol-1799, and the pore diversion effect of the hydrophobic molecular sieve particles promotes the absorption of moisture by the diversion layer and the moisture absorption layer, thereby ensuring the refreshing, dryness and skin-friendly softness of the surface layer.

[0022] The hydroxyl groups on the surface of the loaded nanocellulose cooperate with the hydroxyl and amino groups on the surface of the loaded calcium carbide whiskers to promote the connection between the loaded nanocellulose and the loaded calcium carbide whiskers to form a connection network, which is filled in PE and PHA. While ensuring the flow of water, the surface layer has better tensile strength and softness, thereby improving the tensile resistance and tear resistance of the diaper.

[0023] Preferably, the hydrophobic molecular sieve particles are prepared by treating molecular sieve with a cetearyl alcohol solution.

[0024] By adopting the above technical scheme, the cetearyl alcohol solution has a certain hydrophobicity, penetrates into the pores of the molecular sieve, improves the hydrophobic effect of the molecular sieve pores, promotes the diversion of moisture in the surface layer to the moisture-absorbing layer, prevents moisture back-osmosis while ensuring air permeability, thereby ensuring the dryness of the surface layer; and cetearyl alcohol can improve the bonding effect between the loaded nanocellulose and the loaded calcium carbide whiskers, increase compatibility, and make the prepared surface layer have higher tensile strength; at the same time, the smooth properties of cetearyl alcohol can improve the delicate softness of the surface layer, reduce skin friction, and thus improve the softness and comfort of the diaper.

[0025] Preferably, the PET core material is made of PET and chitosan particles in a mass ratio of 100:1-3.

[0026] By adopting the above technical solution, the antibacterial effect of chitosan particles is combined with the tensile strength of PET to further improve the tensile strength and antibacterial properties of ES flat fibers, and the prepared diapers have better durability and longer service life.

[0027] Preferably, the compatibilizer is maleic anhydride grafted polyethylene.

[0028] By adopting the above technical solution, the compatibility and connectivity between PE and other raw materials are improved, thereby improving the tensile strength and tensile strength of ES flat fibers, and diapers are not easily torn and damaged.

[0029] Preferably, the hygroscopic material in the hygroscopic layer is made of macroporous adsorption resin and coated coconut shell charcoal in a mass ratio of 100:10-25.

[0030] By adopting the above technical solution, the super absorbent resin has a good adsorption effect, which can lock in moisture after absorbing it. The porous structure of the coated coconut shell charcoal can efficiently adsorb odor molecules such as ammonia and hydrogen sulfide in urine, while adjusting the acid-base balance. Through fixed adsorption, the diapers are not easy to emit odor during use. In addition, the porous air permeability of the coated coconut shell charcoal reduces the feeling of stuffiness and improves the quality of diapers.

[0031] Preferably, the coated coconut shell charcoal is prepared from the coated coconut shell charcoal and the composite membrane liquid in a mass ratio of 1:0.8-1.5; the composite membrane liquid is prepared from polyvinyl alcohol-1799 solution, glutathione solution, glycerol and glutaraldehyde in a mass ratio of 1:0.2-0.36:0.05-0.1:0.01-0.02.

[0032] By adopting the above technical scheme, a composite film is formed on the surface of the coated coconut shell charcoal after the composite film liquid dries. The viscosity of the polyvinyl alcohol-1799 solution is utilized in combination with the filling of glutathione, and with the help of the plasticization of glycerol and the cross-linking effect of glutaraldehyde, the coating effect of the coated coconut shell charcoal is further improved. The barrier property of the polyethylene glycol-1799 solution after film formation is utilized to minimize the effect of the coated coconut shell charcoal on its adsorption of odors due to water absorption. In addition, the plasticization of glycerol and glutaraldehyde is utilized to improve the toughness and tensile strength of the film layer. When infants and young children are active, the surface layer is not easily torn, thereby ensuring the service life and quality of the diapers.

[0033] After forming a film, the polyvinyl alcohol-1799 solution can adjust the diffusion path of the pore liquid, and cooperate with glutathione to remove oxidative free radicals in urine, protecting the long-term adsorption effect of the coated coconut shell charcoal. At the same time, glutathione can bind to irritants such as ammonia and sulfide in urine, thereby controlling odor and extending the service life of diapers.

[0034] In a second aspect, the present application provides a method for preparing a skin-friendly sanitary product based on flat fibers, using the following technical solution:

[0035] A method for preparing a skin-friendly sanitary product based on flat fibers comprises the following steps:

[0036] S1, melting the material of the core layer to obtain a melt;

[0037] S2, PE, PHA, and a compatibilizer are mixed and stirred evenly, and then calcium carbide whiskers and nanocellulose are added and mixed and stirred evenly, and melted to obtain a melt mixture;

[0038] S3, after the melt and the melt mixture are mixed, spinning, bundling, stretching, heat setting, crimping, and cutting are performed to obtain ES flat fibers;

[0039] S3 and ES fibers are woven into an ES flat fiber surface layer, which is then bonded in sequence to a guide layer, a moisture absorbing layer, and a base film by spraying glue. After the glue is dried and solidified, a finished product is obtained.

[0040] By adopting the above technical solution, the prepared ES fiber surface layer has good tensile strength, softness, comfort, and hygroscopicity. Combined with the hygroscopic layer, the diaper has the advantages of skin-friendly touch, dry and non-sticky, good anti-pull effect, and long service life.

[0041] In summary, this application has the following beneficial effects:

[0042] 1. The ES fiber surface layer has good tensile strength, softness, comfort and moisture absorption. Combined with the moisture-absorbing layer, it makes the diaper skin-friendly, dry and non-sticky, with good anti-pull effect and long service life.

[0043] 2. Polyvinyl alcohol-1799 solution and cetearyl alcohol are combined. The film formed by polyvinyl alcohol-1799 solution has selective permeability and can selectively pass water. The microporous structure of the membrane can evenly distribute the liquid flow and reduce the risk of gel agglomeration caused by water absorption. Cetearyl alcohol can reduce the salt content of urine and inhibit the agglomeration tendency caused by ionic cross-linking of the absorbent resin, thereby preventing the absorbent resin in the moisture-absorbing layer from agglomerating and accumulating and affecting the comfort of the diaper.

[0044] 3. After drying, the polyvinyl alcohol-1799 solution forms a transparent and dense film, which improves the skin-friendly comfort of the diaper surface layer; and after the polyvinyl alcohol-1799 solution forms a film, it has selective permeability to water, and tries to organize liquid reverse osmosis, thereby ensuring the dryness of the surface layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a cross-sectional view of the ES flat fiber in Example 1 of the present application. DETAILED DESCRIPTION

[0046] The present application is further described in detail below with reference to the embodiments.

[0047] The following raw materials are all commercially available.

[0048] Preparation Example of Loaded Calcium Carbide Whiskers

[0049] Preparation Example 1: Loaded calcium carbide whiskers were prepared using the following method:

[0050] The fucoidan was placed in water at a temperature of 85°C and stirred until the fucoidan was completely dissolved to obtain a fucoidan solution with a mass fraction of 1%;

[0051] 1 kg of silica gel particles were immersed and dispersed in 10 kg of aminosilane coupling agent, wherein the aminosilane coupling agent was silane coupling agent KH-550. The frequency of ultrasonic dispersion was 20 kHz and the dispersion was carried out for 10 minutes. The silica gel particles were then filtered and separated to obtain hydrophobic silica gel particles. The average particle size of the silica gel particles was 300 nm.

[0052] 0.15 kg of fucoidan solution was evenly sprayed on the surface of 1 kg of calcium carbide whiskers, and the average length of the calcium carbide whiskers was 2 μm. Then 0.12 kg of hydrophobic silica particles were added, dried and dispersed to obtain loaded calcium carbide whiskers. The average particle size of the loaded calcium carbide whiskers was less than 4 μm.

[0053] Preparation Example 2: This preparation example differs from Preparation Example 1 in that:

[0054] 0.1 kg of fucoidan solution was evenly sprayed on the surface of 1 kg of calcium carbide whiskers, and the average length of the calcium carbide whiskers was 2 μm. Then 0.1 kg of hydrophobic silica particles were added, dried, and dispersed to obtain loaded calcium carbide whiskers. The average particle size of the loaded calcium carbide whiskers was less than 4 μm.

[0055] Preparation Example 3: This preparation example differs from Preparation Example 1 in that:

[0056] 0.2 kg of fucoidan solution was evenly sprayed on the surface of 1 kg of calcium carbide whiskers, and the average length of the calcium carbide whiskers was 2 μm. Then 0.15 kg of hydrophobic silica particles were added, dried and dispersed to obtain loaded calcium carbide whiskers. The average particle size of the loaded calcium carbide whiskers was less than 4 μm.

[0057] Preparation example of loaded nanocellulose

[0058] Preparation Example 4: Loaded nanocellulose was prepared by the following method:

[0059] 1 kg of molecular sieve was immersed and dispersed in 10 kg of cetearyl alcohol solution, the average particle size of the molecular sieve was 2 μm, the frequency of ultrasonic dispersion was 20 kHz, the dispersion time was 5 min, the cetearyl alcohol solution was a 2% by mass cetearyl alcohol ethanol solution, and the ethanol mass fraction was 99%. The molecular sieve was then separated by filtration, dried, and dispersed to obtain hydrophobic molecular sieve particles.

[0060] Place polyvinyl alcohol-1799 in 95°C hot water and stir until the polyvinyl alcohol-1799 is completely dissolved to obtain a 1% by mass polyvinyl alcohol-1799 solution;

[0061] 0.08 kg of polyvinyl alcohol-1799 solution was evenly sprayed on the surface of 1 kg of nanocellulose, and then 0.15 kg of hydrophobic molecular sieve particles were added. The average length of the nanocellulose was 200 nm, and the addition rate of the hydrophobic molecular sieve particles was 60 g / min. During the addition process, the nanocellulose was continuously stirred at a speed of 120 r / min. After the addition was completed, the mixing and stirring was continued for 10 minutes, and then dried and dispersed to obtain the loaded nanocellulose. The average particle size of the loaded nanocellulose was less than 4 μm.

[0062] Preparation Example 5: This preparation example differs from Preparation Example 4 in that:

[0063] 0.05 kg of polyvinyl alcohol-1799 solution was evenly sprayed on the surface of 1 kg of nanocellulose, and then 0.1 kg of hydrophobic molecular sieve particles were added. The average length of the nanocellulose was 200 nm, and the addition rate of the hydrophobic molecular sieve particles was 60 g / min. During the addition process, the nanocellulose was continuously stirred at a speed of 120 r / min. After the addition was completed, the mixing and stirring was continued for 10 minutes, and then dried and dispersed to obtain the loaded nanocellulose. The average particle size of the loaded nanocellulose was less than 4 μm.

[0064] Preparation Example 6: This preparation example differs from Preparation Example 4 in that:

[0065] 0.1 kg of polyvinyl alcohol-1799 solution was evenly sprayed on the surface of 1 kg of nanocellulose, and then 0.2 kg of hydrophobic molecular sieve particles were added. The average length of the nanocellulose was 200 nm, and the addition rate of the hydrophobic molecular sieve particles was 60 g / min. During the addition process, the nanocellulose was continuously stirred at a speed of 120 r / min. After the addition was completed, the mixing and stirring was continued for 10 minutes, and then dried and dispersed to obtain the loaded nanocellulose. The average particle size of the loaded nanocellulose was less than 4 μm.

[0066] Preparation example of coated coconut shell charcoal

[0067] Preparation Example 7: Coated coconut shell charcoal was prepared by the following method:

[0068] Place polyvinyl alcohol-1799 in 95°C hot water and stir until the polyvinyl alcohol-1799 is completely dissolved to obtain a 1% by mass polyvinyl alcohol-1799 solution;

[0069] Glutathione was placed in water and stirred until completely dissolved to obtain a glutathione solution with a mass fraction of 1%;

[0070] Weigh 1 kg of polyvinyl alcohol-1799 solution and 0.3 kg of glutathione solution, mix and stir evenly, then add 0.08 kg of glycerol and mix and stir, then add 0.02 kg of glutaraldehyde, mix and stir evenly at 60°C to obtain a composite membrane solution;

[0071] 1 kg of composite film liquid is evenly sprayed on the surface of 1 kg of coated coconut shell charcoal. The average particle size of the coated coconut shell charcoal is 80 μm. The coated coconut shell charcoal is dried and dispersed until the coated coconut shell charcoal does not stick to each other and agglomerate to obtain the coated coconut shell charcoal.

[0072] Preparation Example 8: This preparation example differs from Preparation Example 7 in that:

[0073] Weigh 1 kg of polyvinyl alcohol-1799 solution and 0.2 kg of glutathione solution, mix and stir evenly, then add 0.05 kg of glycerol and mix and stir, then add 0.01 kg of glutaraldehyde, mix and stir evenly at 60°C to obtain a composite membrane solution;

[0074] 1 kg of composite film liquid was evenly sprayed on the surface of 0.8 kg of coated coconut shell charcoal. The average particle size of the coated coconut shell charcoal was 80 μm. The coated coconut shell charcoal was dried and dispersed until the coated coconut shell charcoal did not stick to each other and agglomerate to obtain the coated coconut shell charcoal.

[0075] Preparation Example 9: This preparation example differs from Preparation Example 7 in that:

[0076] Weigh 1 kg of polyvinyl alcohol-1799 solution and 0.36 kg of glutathione solution, mix and stir evenly, then add 0.1 kg of glycerol and mix and stir, then add 0.02 kg of glutaraldehyde, mix and stir evenly at 60°C to obtain a composite membrane solution;

[0077] 1 kg of composite film liquid was evenly sprayed on the surface of 1.5 kg of coated coconut shell charcoal. The average particle size of the coated coconut shell charcoal was 80 μm. The coated coconut shell charcoal was dried and dispersed until the coated coconut shell charcoal did not stick to each other and agglomerate to obtain the coated coconut shell charcoal. Example

[0078] Example 1: A skin-friendly hygiene product based on flat fibers:

[0079] It includes ES flat fiber surface layer, distribution layer, moisture absorption layer and base film;

[0080] The ES flat fiber skin material in the ES flat fiber surface layer includes: 90 kg of PE, 25 kg of PHA, 2 kg of a compatibilizer, 3 kg of calcium carbide whiskers, and 2 kg of cellulose fibers. The compatibilizer is maleic anhydride-grafted polyethylene. The calcium carbide whiskers are prepared in Preparation Example 1, and the nanocellulose is prepared in Preparation Example 4.

[0081] The core material of ES flat fiber: PET 100kg, chitosan microparticles 2kg, the average particle size of chitosan microparticles is 200nm;

[0082] The guide layer is hot air non-woven fabric;

[0083] The hygroscopic layer is made by coating a hygroscopic material in a non-woven fabric and then sealing and sewing it. The hygroscopic material is composed of a macroporous adsorption resin and coated coconut shell charcoal in a mass ratio of 100:20. The coated coconut shell charcoal adopts the coated coconut shell charcoal prepared in Preparation Example 7.

[0084] The preparation method is as follows:

[0085] S1. Mix the materials of the core layer and place them in a screw extruder, melt them at 250°C to obtain a melt;

[0086] S2, PE, PHA, and a compatibilizer are mixed and stirred evenly, and then calcium carbide whiskers and cellulose fibers are added and mixed and stirred evenly, and melted in a screw extruder. The temperature sections in the screw extruder are: conveying section 180° C., melting section 210° C., enhanced dispersion section 240° C., mixing section 250° C., exhaust section 240° C., and homogenization section 230° C. to obtain a polyethylene melt and a mixed melt;

[0087] S3, after the melt and the melt mixture are mixed, spinning, bundling, stretching, heat setting, curling, and cutting are performed to obtain ES flat fibers; the spinning output is flat fibers with a stretch ratio of 3.7:1;

[0088] S3 and ES flat fibers are woven to obtain an ES flat fiber surface layer, and glue is sprayed on one side of the ES flat fiber surface layer at a rate of 30 mL per square meter, and then a hot air non-woven fabric is attached, which serves as a guide layer. Glue is then evenly sprayed on the side of the hot air non-woven fabric away from the ES flat fiber surface layer at a rate of 30 mL per square meter, and then a hygroscopic layer is attached. Glue is evenly sprayed on the other side of the hygroscopic layer at a rate of 30 mL per square meter, and then a base film is attached, which is a PE film. After the glue is completely dried and solidified, the finished product is obtained. The glue is a sodium carboxymethyl cellulose solution, which is a 1% by mass sodium carboxymethyl cellulose aqueous solution.

[0089] Example 2: This example differs from Example 1 in that:

[0090] ES flat fiber leather: PE 80kg, PHA 20kg, compatibilizer 1kg, loaded calcium carbide whiskers 1kg, loaded cellulose fiber 1kg; the compatibilizer is maleic anhydride grafted polyethylene; the loaded calcium carbide whiskers are the loaded calcium carbide whiskers prepared in Preparation Example 2, and the loaded nanocellulose is the loaded nanocellulose prepared in Preparation Example 5;

[0091] The core material of ES flat fiber: PET 100kg, chitosan microparticles 1kg, the average particle size of chitosan microparticles is 200nm;

[0092] The guide layer is a hot air non-woven fabric; the moisture absorption layer is composed of a macroporous adsorption resin and coated coconut shell charcoal in a mass ratio of 100:10, and the coated coconut shell charcoal adopts the coated coconut shell charcoal prepared in Preparation Example 8.

[0093] Example 3: This example differs from Example 1 in that:

[0094] ES flat fiber leather: PE 100kg, PHA 30kg, compatibilizer 3kg, loaded calcium carbide whiskers 4kg, loaded cellulose fiber 3kg; the compatibilizer is maleic anhydride grafted polyethylene; the loaded calcium carbide whiskers are the loaded calcium carbide whiskers prepared in Preparation Example 3, and the loaded nanocellulose is the loaded nanocellulose prepared in Preparation Example 6;

[0095] The core material of ES flat fiber: PET 100kg, chitosan microparticles 3kg, the average particle size of chitosan microparticles is 200nm;

[0096] The guide layer is a hot air non-woven fabric; the moisture absorption layer is composed of a macroporous adsorption resin and coated coconut shell charcoal in a mass ratio of 100:25, and the coated coconut shell charcoal adopts the coated coconut shell charcoal prepared in Preparation Example 9.

[0097] Example 4: This example differs from Example 1 in that:

[0098] No hydrophobic silica particles were added during the preparation of loaded calcium carbide whiskers.

[0099] Example 5: This example differs from Example 1 in that:

[0100] No fucoidan solution was added during the preparation of loaded calcium carbide whiskers.

[0101] Example 6: This example differs from Example 1 in that:

[0102] No polyvinyl alcohol-1799 solution was added during the preparation of loaded nanocellulose.

[0103] Example 7: This example differs from Example 1 in that:

[0104] No hydrophobic molecular sieve particles were added during the preparation of loaded nanocellulose.

[0105] Example 8: This example differs from Example 1 in that:

[0106] During the preparation of the coated coconut shell charcoal in the hygroscopic layer, no glutathione solution was added.

[0107] Example 9: This example differs from Example 1 in that:

[0108] No coated coconut shell charcoal was added to the hygroscopic layer.

[0109] Comparative Example

[0110] Comparative Example 1: The difference between this comparative example and Example 1 is that:

[0111] No loaded calcium carbide whiskers and loaded nanocellulose were added to the raw materials.

[0112] Performance testing

[0113] 1. ES flat fiber structure detection

[0114] The cross-sectional view of the ES flat fiber of Example 1 was observed using a scanning electron microscope. Figure 1 .

[0115] 2. Surface performance testing

[0116] The ES flat fiber surface layer was prepared by the methods of Examples 1-7 and Comparative Example 1, and the softness (longitudinal), breaking strength (longitudinal), and rewet amount were tested with reference to GB / T24218.6, and the data were recorded. The air permeability was tested with reference to GB / T5453, and the data were recorded. The skin affinity was scored, with 10 points for good skin affinity, no surface fiber burrs, and a smooth feel, and 0 points for poor skin affinity, severe surface fiber burrs, and a rough feel. The average value of the 10 groups of data was recorded.

[0117] Table 1 Performance Test Table (“ / ” in the table indicates that the corresponding embodiment or comparative example was not tested for the item, so there is no data)

[0118]

[0119] In combination with Examples 1-7 and Comparative Example 1 and Table 1, it can be seen that the surface layer prepared in the present application has good skin-friendly softness, high tensile strength, is not easy to rewet, and has good air permeability; Example 4 verifies that the addition of hydrophobic silica gel particles can further improve the structural tensile strength of the surface layer, and can control rewetting, and can also improve the softness of the surface layer; Example 5 verifies that the addition of fucoidan can improve the skin-friendly effect and softness, and improve the tensile strength of the surface layer through the cross-linking effect, and can also control rewetting; Example 6 verifies that the added polyvinyl alcohol-1799 solution can improve the softness and tensile strength of the surface layer, control rewetting and have a good skin-friendly effect; Example 7 verifies that the added hydrophobic molecular sieve particles use their filling effect to improve the structural stability of the surface layer and control the rewetting amount; Comparative Example 1 verifies that the combination of loaded calcium carbide whiskers and loaded nanocellulose can improve the softness of the surface layer, control the rewetting amount, and have a good skin-friendly effect.

[0120] 3. Diaper performance testing

[0121] Finished products (diapers) were prepared using the methods of Examples 1-3 and 8-9, respectively;

[0122] Refer to GB / T22875 to test the absorption rate. The test liquid is sodium chloride aqueous solution. Weigh 5g of the absorbent core layer sample and add it to a beaker. Weigh 50mL of 0.9% sodium chloride aqueous solution and add it to the beaker. Immediately start timing. Observe that the liquid has completely disappeared from the surface of the absorbent core layer sample. When the beaker is tilted 60° and there is no liquid, stop timing. Record the data. Take the average value of 3 parallel groups. The faster the absorption rate, the better the hygroscopicity.

[0123] Refer to GB / T8939-2018 standard, use a clip to clamp one end of the diaper test sample and seal it. Immerse the diaper with the antibacterial surface facing up together with the clip in a constant temperature water bath filled with 12cm deep artificial urine. After immersion for 60 seconds, lift the clip and hang the diaper vertically for 100 seconds. Weigh its wet weight and calculate the liquid absorption rate of the diaper; liquid absorption rate = (mass after liquid absorption - mass before liquid absorption) / mass before liquid absorption, and record the data;

[0124] Deodorization test: Cut the finished product sample into a size of 120mm×120mm, set the sealed environment temperature to 25℃ and the relative humidity to 60%, measure 40mL of ammonia water and 5mL of sodium hydroxide and pour them into the experimental container, close the sealed box, let it stand for 1 hour, and then measure the ammonia concentration in the sealed box. Then place the test sample in the sealed box, let it stand for 18 hours, and then measure the ammonia concentration in the sealed box to calculate the deodorization rate in the sealed box.

[0125] Table 2 Performance Test Table (“ / ” in the table indicates that the corresponding embodiment or comparative example was not tested for the item, so there is no data)

[0126]

[0127] Combining Examples 1-3 and Examples 8-9 with Table 2, it can be seen that the skin-friendly sanitary diapers prepared in the present application have good hygroscopicity and good deodorizing effect; Example 8 does not add glutathione, and Example 9 does not add coated coconut shell charcoal, and the deodorizing effect is worse than that of Example 1, indicating that the coated coconut shell charcoal coated with polyvinyl alcohol-1799 solution, glutathione solution, glycerol and glutaraldehyde has a good deodorizing effect.

[0128] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A skin-friendly sanitary product based on flat fibers, characterized in that: It includes ES flat fiber surface layer, air distribution layer, moisture absorption layer and base film; The ES flat fiber skin material in the ES flat fiber surface layer is made of the following raw materials in parts by weight: 80-100 parts of PE, 20-30 parts of PHA, 1-3 parts of a compatibilizer, 1-4 parts of calcium carbide whiskers as a carrier, and 1-3 parts of nanocellulose as a carrier; The core material of ES flat fiber is PET core material; The loaded calcium carbide whiskers are prepared from calcium carbide whiskers, fucoidan solution and hydrophobic silica gel particles in a mass ratio of 1:0.1-0.2:0.1-0.15; the hydrophobic silica gel particles are prepared from silica gel particles treated with an aminosilane coupling agent; the loaded nanocellulose is prepared from nanocellulose, polyvinyl alcohol-1799 solution and hydrophobic molecular sieve particles in a mass ratio of 1:0.05-0.1:0.1-0.2; the hydrophobic molecular sieve particles are prepared from molecular sieve treated with a cetearyl alcohol solution.

2. A skin-friendly sanitary product based on flat fibers according to claim 1, characterized in that: The PET core material is prepared from PET and chitosan particles in a mass ratio of 100:1-3.

3. A skin-friendly sanitary product based on flat fibers according to claim 1, characterized in that: The compatibilizer is maleic anhydride grafted polyethylene.

4. A skin-friendly sanitary product based on flat fibers according to claim 1, characterized in that: The moisture absorbing material in the moisture absorbing layer is prepared from macroporous adsorption resin and coated coconut shell charcoal in a mass ratio of 100:10-25.

5. A skin-friendly sanitary product based on flat fibers according to claim 4, characterized in that: The coated coconut shell charcoal is prepared from the coated coconut shell charcoal and the composite membrane liquid in a mass ratio of 1:0.8-1.5; the composite membrane liquid is prepared from polyvinyl alcohol-1799 solution, glutathione solution, glycerol and glutaraldehyde in a mass ratio of 1:0.2-0.36:0.05-0.1:0.01-0.

02.

6. A method for preparing a skin-friendly sanitary product based on flat fibers according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1, melting the material of the core layer to obtain a melt; S2, PE, PHA, and a compatibilizer are mixed and stirred evenly, and then calcium carbide whiskers and nanocellulose are added and mixed and stirred evenly, and melted to obtain a melt mixture; S3, after the melt and the melt mixture are mixed, spinning, bundling, stretching, heat setting, crimping, and cutting are performed to obtain ES flat fibers; S3 and ES fibers are woven into an ES flat fiber surface layer, which is then bonded in sequence to a guide layer, a moisture absorbing layer, and a base film by spraying glue. After the glue is dried and solidified, a finished product is obtained.

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