Antibacterial sanitary product containing degradable material and preparation method thereof

Abstract

The invention discloses an antibacterial sanitary product containing a degradable material and a preparation method thereof, belonging to the technical field of sanitary products. The product comprises a surface non-woven fabric, an antibacterial coating, an upper wrapping non-woven fabric, a cotton core layer, a lower wrapping non-woven fabric, an antibacterial coating, and a breathable bottom film which are sequentially arranged from top to bottom, wherein a plurality of degradation-promoting particles are wrapped in the cotton core layer, and the degradation-promoting particles are composed of a plurality of degradation particles wrapped in an outer shell on the surface; the preparation method comprises the following steps: S1, preparing a surface non-woven fabric, an upper wrapping non-woven fabric, a lower wrapping non-woven fabric, and a breathable bottom film; S2, preparing a wrapping solution and mixing it with the degradation particles to obtain a degradation-promoting solution; S3, preparing a cotton core layer by using cotton fibers and the degradation-promoting solution; and S4, compounding the raw materials in sequence to obtain sanitary products; the sanitary products of the invention have a high degradation rate after being used and discarded, and effectively alleviate the problem of plastic pollution.

Description

Technical Field

[0001] The present invention relates to the technical field of sanitary products, and in particular to an antibacterial sanitary product containing a degradable material and a preparation method thereof. Background Art

[0002] At present, common sanitary products in life are made of a large amount of difficult-to-degrade plastic materials. The degradation cycle of these plastic materials is extremely long, and they are easy to occupy the space of natural environment such as land, water and soil, threatening the living environment of humans and wild animals, and posing a potential health threat to the creatures on the earth; although some sanitary products currently use degradable plastics as raw materials, and degradable plastics are used to make intermediate products such as non-woven fabrics and breathable films, the degradation process of the degradable plastics in sanitary products after they are discarded is more dependent on factors such as temperature, humidity, and microorganisms in the environment, resulting in the degradation rate of plastics in sanitary products being unsatisfactory, making it difficult to efficiently alleviate the increasingly serious problem of plastic pollution.

[0003] Based on the above situation, a Chinese patent with announcement number CN105671793A discloses a method for preparing a polylactic acid biodegradable nonwoven fabric for a surface coating layer of a sanitary product, comprising 1) selecting polylactic acid raw materials, 2) drying polylactic acid slices, 3) pouring into a screw extruder for extrusion, 4) melt filtering, 5) spinning polylactic acid filaments, 6) airflow drawing, 7) laying nets, 8) hydroentanglement reinforcement, drying and winding molding; through the above method, the polylactic acid filament web forming technology and the hydroentanglement reinforcement technology are combined to obtain a polylactic acid nonwoven fabric layer with high strength, soft hand feel, fluffy and good permeability, which has the characteristics of being renewable, biodegradable, biocompatible, low carbon emissions and low energy consumption, and the hydroentanglement reinforcement is self-bonded without adding any chemical adhesives, so the adverse impact on the environment is minimal, and the product has the same soft hand feel and non-pilling appearance as traditional textiles, which can overcome the defect of the hard hand feel of spunbond nonwoven fabrics and is used for the surface layer of disposable sanitary products.

[0004] The above patent discloses a nonwoven fabric that can be used as the surface layer of sanitary products. The nonwoven fabric can be completely biodegraded based on the characteristics of polylactic acid. However, the biodegradation of polylactic acid is more dependent on suitable environmental conditions such as temperature, humidity, and microorganisms. Otherwise, the degradation rate will be relatively low. In actual operation, it is difficult to create suitable environmental conditions to increase the degradation rate of sanitary products after they are discarded, and sanitary products or nonwoven fabrics themselves do not have the characteristics that can increase the degradation rate. Therefore, the nonwoven fabric still has room for improvement. Summary of the invention

[0005] In view of the technical defects existing in the background technology, the present invention proposes an antibacterial sanitary product containing a degradable material and a preparation method thereof, which solves the above technical problems and meets the actual needs. The specific technical solution is as follows: An antibacterial sanitary product containing a degradable material, comprising a surface non-woven fabric, a composite absorbent cotton core, a breathable bottom film, and an antibacterial coating, wherein the surface non-woven fabric, the composite absorbent cotton core, and the breathable bottom film are arranged in sequence from top to bottom, and the antibacterial coating has two layers, which are respectively arranged on the lower surface of the surface non-woven fabric and the upper surface of the breathable bottom film; The composite absorbent cotton core is composed of an upper non-woven fabric wrapping, a cotton core layer, and a lower non-woven fabric wrapping from top to bottom. The cotton core layer is wrapped with a plurality of degradation-promoting particles, and the degradation-promoting particles are composed of a plurality of degradation particles wrapped in an outer shell on the surface.

[0006] As a further technical solution of the present invention, the degradation particles are selected from Bacillus subtilis spores, and the mass ratio of the degradation particles to the outer shell in the degradation-promoting particles is 1:(2-10).

[0007] As a further technical solution of the present invention, the antibacterial coating is formed by coating the antibacterial coating on the lower surface of the surface non-woven fabric and the upper surface of the breathable base film and then curing the coating. The antibacterial coating consists of a water-based adhesive, inactivated probiotics, and a probiotic protective agent.

[0008] As a further technical solution of the present invention, the antibacterial coating comprises the following components by mass percentage: 55% to 85% of aqueous adhesive, 5% to 15% of inactivated probiotics, and 10% to 30% of probiotic protective agent.

[0009] As a further technical solution of the present invention, the water-based adhesive is selected from one of polyvinyl acetate adhesive, acrylic acid water-based adhesive, water-based polyurethane adhesive, and polyvinyl alcohol water-based adhesive.

[0010] A method for preparing antibacterial sanitary products containing degradable materials comprises the following steps: S1, heating and melting the biodegradable plastic, spinning, laying into a net, reinforcing, and cutting to obtain a surface non-woven fabric, an upper wrapping non-woven fabric, and a lower wrapping non-woven fabric; mixing the biodegradable plastic with a filler, heating and melting, extruding, casting, stretching, and cutting to obtain a breathable bottom film; S2, mixing sodium alginate, glycerol, a surfactant and sterile water to obtain a coating solution, dispersing the degradable microparticles in the coating solution and stirring evenly to obtain a degradation-promoting solution; S3, evenly laying cotton fibers to form a first cotton fiber layer, evenly spraying the degradation-promoting solution on the upper surface of the first cotton fiber layer, evenly laying cotton fibers on the upper surface of the first cotton fiber layer to form a second cotton fiber layer, extruding the first cotton fiber layer and the second cotton fiber layer and then drying them to obtain a cotton core layer, and the degradation-promoting solution is dried inside the cotton core layer to form a plurality of degradation-promoting particles; S4. The upper wrapping non-woven fabric, the cotton core layer, and the lower wrapping non-woven fabric are bonded sequentially by hot-melt adhesive to obtain a composite absorbent cotton core, the antibacterial coating is applied on the lower surface of the surface non-woven fabric and bonded to the upper surface of the composite absorbent cotton core, the antibacterial coating is applied on the upper surface of the breathable bottom film and bonded to the lower surface of the composite absorbent cotton core, and the sanitary product is obtained after the antibacterial coating is cured.

[0011] As a further technical solution of the present invention, the biodegradable plastic is selected from one of a completely biodegradable plastic and a destructive biodegradable plastic; the completely biodegradable plastic is selected from one or more of polycaprolactone, polylactic acid, polybutylene succinate, and polyhydroxyalkanoate; the destructive biodegradable plastic is selected from one or more of starch-modified polyethylene, starch-modified polypropylene, and starch-modified polyester.

[0012] As a further technical solution of the present invention, the encapsulation solution comprises the following components by mass percentage: 2% to 5% sodium alginate, 5% to 10% glycerol, 0.1% to 1% surfactant, and the balance is sterile water.

[0013] As a further technical solution of the present invention, the surfactant is selected from polyoxyethylene alkylphenol ether and polyoxyethylene fatty alcohol ether.

[0014] The beneficial effects of the present invention are: The sanitary products of the present invention are provided with two layers of antibacterial coating inside, and have good antibacterial performance. The surface non-woven fabric, the upper wrapping non-woven fabric, the cotton core layer, the lower wrapping non-woven fabric, and the breathable bottom film are all made of degradable materials, so that the sanitary products can be completely degraded, which is conducive to alleviating the increasingly serious plastic pollution problem. At the same time, when the degradation-promoting particles absorb liquid, they will activate the degradation particles and grow Bacillus subtilis, and the antibacterial coating can promote Bacillus subtilis to form a dominant bacterial community. The degradation rate of the degradable material is accelerated by Bacillus subtilis, and the degradation rate of the sanitary products discarded after use can be increased, which effectively alleviates the plastic pollution problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view of an antibacterial hygiene product containing a degradable material.

[0016] Figure 2 The present invention is a cross-sectional view of degradation-promoting particles of an antibacterial hygiene product containing a degradable material.

[0017] Among them: 1-surface non-woven fabric, 2-composite absorbent cotton core, 21-upper wrapping non-woven fabric, 22-cotton core layer, 23-lower wrapping non-woven fabric, 3-breathable bottom film, 4-antibacterial coating, 5-degradation promoting particles, 51-outer shell, 52-degradable microparticles. DETAILED DESCRIPTION

[0018] The implementation modes of the present invention are described below in conjunction with the accompanying drawings and relevant embodiments. The implementation modes of the present invention are not limited to the following embodiments, and the present invention relates to relevant necessary components in the technical field, which should be regarded as the known technology in the technical field and can be known and mastered by the technical personnel in the technical field.

[0019] like Figure 1 As shown, an antibacterial sanitary product containing degradable materials includes a surface non-woven fabric 1, a composite absorbent cotton core 2, a breathable bottom film 3, and an antibacterial coating 4. The surface non-woven fabric 1, the composite absorbent cotton core 2, and the breathable bottom film 3 are arranged in sequence from top to bottom. The antibacterial coating 4 has two layers, and the two antibacterial coatings 4 are respectively arranged on the lower surface of the surface non-woven fabric 1 and the upper surface of the breathable bottom film 3; the composite absorbent cotton core 2 is composed of an upper wrapped non-woven fabric 21, a cotton core layer 22, and a lower wrapped non-woven fabric 23 from top to bottom, and a plurality of degradation-promoting particles 5 are wrapped in the cotton core layer 22, and the degradation-promoting particles 5 are composed of a plurality of degradation particles 52 inside the outer shell 51 on the surface.

[0020] The sanitary products of the present invention can be made into sanitary napkins, menstrual pants, etc., wherein the surface non-woven fabric 1, the upper wrapping non-woven fabric 21, and the lower wrapping non-woven fabric 23 are all made of non-woven fabric materials, and the surface non-woven fabric 1 is preferably a spunlace non-woven fabric, which has the advantages of high water absorption, softness, comfort, good air permeability, etc., and the spunlace non-woven fabric is beneficial to improving the dryness, air permeability and comfort of the contact surface between the sanitary products and the human body, and the upper wrapping non-woven fabric 21 is preferably a hot air non-woven fabric, which has the advantages of fluffy softness, good air permeability, strong moisture removal, etc., and the hot air non-woven fabric is beneficial to improving the comfort and air permeability of sanitary products and can improve the penetration of liquid into the composite absorbent The speed of collecting the inside of the cotton core 2, the lower wrapping non-woven fabric 23 is preferably dust-free paper, which has the advantages of high water absorption and good air permeability. Dust-free paper is beneficial to improving the water absorption and air permeability of sanitary products and promoting the horizontal diffusion of liquid inside the composite absorbent cotton core 2. The breathable bottom film 3 is preferably a waterproof and breathable polyethylene film. The waterproof and breathable polyethylene film can improve the air permeability of sanitary products and prevent liquid from leaking to the surface of sanitary products; the present invention sequentially bonds the upper wrapping non-woven fabric 21, the cotton core layer 22, and the lower wrapping non-woven fabric 23 to form a composite absorbent cotton core 2, and then compounds them with the surface non-woven fabric 1 and the breathable bottom film 3 to obtain the sanitary products of the present invention.

[0021] After adopting the above structure, it needs to be further explained that the sanitary product of the present invention is preferably a sanitary napkin, and its edges on both sides in the width direction are provided with wings extending outward, and the bottom of the wings and the bottom of the breathable bottom film 3 are provided with adhesives, and the adhesives are used to bond and fix the sanitary napkin to the inner side; the sanitary product of the present invention can also be made into menstrual pants. In this case, a layer of bottom non-woven fabric extending outward from the edge of the sanitary product is provided on the lower surface of the breathable bottom film 3, and the surface non-woven fabric 1 extends outward and is bonded and fixed to the bottom non-woven fabric, so that the external structure of the sanitary product is in the shape of pants, and spandex yarn and other materials are provided at the leg circumference and waist circumference of the sanitary product for fixation, thereby obtaining underwear-like menstrual pants.

[0022] The antibacterial coating 4 of the present invention is arranged on the lower surface of the surface non-woven fabric 1 and the upper surface of the breathable base film 3. The antibacterial coating 4 is formed by coating the antibacterial coating on the lower surface of the surface non-woven fabric 1 and the upper surface of the breathable base film 3 and then curing. The antibacterial coating is composed of an aqueous adhesive, inactivated probiotics, and a probiotic protective agent; the antibacterial coating includes the following components in mass percentage: 55%~85% of aqueous adhesive, 5%~15% of inactivated probiotics, and 10%~30% of probiotic protective agent.

[0023] In the antibacterial coating of the present invention, the water-based adhesive makes the antibacterial coating have adhesion performance and film-forming properties. The antibacterial coating is adhered to the lower surface of the surface non-woven fabric 1 and the upper surface of the breathable bottom film 3 by the water-based adhesive, and gradually forms a film and forms an antibacterial coating 4 during the curing process. The water-based adhesive makes the antibacterial coating serve as an adhesive for bonding and fixing the composite absorbent cotton core 2 to the surface non-woven fabric 1 and the breathable bottom film 3. After the antibacterial coating is applied, the adhesive bonding and compounding of the sanitary products are carried out at the same time, avoiding the use of additional adhesives. The antibacterial coating 4 has the properties of being based on the inactivated probiotics in the antibacterial coating. Antibacterial function: Although inactivated probiotics have lost their activity, their cell walls and metabolites still contain antibacterial ingredients, which can effectively inhibit the growth of harmful bacteria. Inactivated probiotics are safer and will not cause secondary infection or antibiotic resistance. At the same time, probiotic protectors are compounded with synthetic oils, emulsifiers, antioxidants, preservatives and other raw materials. Inactivated probiotics are usually stored in the form of freeze-dried powder. Probiotic protectors are mainly used to dissolve inactivated probiotics and maintain the stability and durability of the active ingredients in the inactivated probiotics.

[0024] Furthermore, the water-based adhesive is selected from one of polyvinyl acetate adhesive, acrylic water-based adhesive, water-based polyurethane adhesive, and polyvinyl alcohol water-based adhesive; the water-based adhesive is an adhesive with water as solvent, which has good viscosity in a wet state and can achieve close adhesion between materials. The water-based adhesive has the advantages of being environmentally friendly, non-toxic, odorless, and easy to operate, and is very suitable for sanitary products that need to directly contact the skin. Among them, polyvinyl acetate adhesive has good air permeability and softness, which is beneficial to ensure the air permeability and comfort of sanitary products. Acrylic water-based adhesive has good softness and strong adhesion, which is beneficial to ensure the comfort of sanitary products and avoid internal degumming. Water-based polyurethane adhesive has good flexibility and strong adhesion, which is beneficial to improve the structural stability of sanitary products. Polyvinyl alcohol water-based adhesive has strong adhesion and relatively low cost, which is beneficial to reduce the production cost of sanitary products.

[0025] The surface non-woven fabric 1, the upper wrapping non-woven fabric 21, the lower wrapping non-woven fabric 23, and the breathable bottom film 3 of the present invention all use biodegradable plastics as raw materials, and the biodegradable plastics are selected from one of completely biodegradable plastics and destructive biodegradable plastics; wherein, the completely biodegradable plastics include polycaprolactone, polylactic acid, polybutylene succinate, and polyhydroxyalkanoate, and the completely biodegradable plastics all use biodegradable components, which can be decomposed at a faster rate in the natural environment, and finally generate carbon dioxide and water, thereby reducing pollution to the environment; the destructive biodegradable plastics include starch-modified polyethylene, starch-modified polypropylene, and starch-modified polyester, and the destructive biodegradable plastics are materials that can be degraded at a faster rate under the action of microorganisms. Although the degradation process may not be complete, compared with traditional plastic materials, the higher degradation speed and degradation rate of the destructive biodegradable plastics are also conducive to alleviating the current plastic pollution threat.

[0026] A method for preparing antibacterial sanitary products containing degradable materials comprises the following steps: S1, heating and melting the biodegradable plastic, spinning, laying into a net, reinforcing, and cutting to obtain a surface non-woven fabric 1, an upper wrapping non-woven fabric 21, and a lower wrapping non-woven fabric 23; mixing the biodegradable plastic with a filler, heating and melting, extruding, casting, stretching, and cutting to obtain a breathable bottom film 3; S2, mixing sodium alginate, glycerol, a surfactant and sterile water to obtain a coating solution, dispersing the degradable microparticles 52 in the coating solution and stirring evenly to obtain a degradation-promoting solution; S3, evenly laying cotton fibers to form a first cotton fiber layer, evenly spraying the degradation-promoting solution on the upper surface of the first cotton fiber layer, evenly laying cotton fibers on the upper surface of the first cotton fiber layer to form a second cotton fiber layer, extruding the first cotton fiber layer and the second cotton fiber layer, and then drying to obtain a cotton core layer 22, and the degradation-promoting solution is dried inside the cotton core layer to form a plurality of degradation-promoting particles 5; S4. The upper wrapping non-woven fabric 21, the cotton core layer 22, and the lower wrapping non-woven fabric 23 are bonded together in sequence by hot-melt adhesive to obtain a composite absorbent cotton core 2. The antibacterial coating is applied on the lower surface of the surface non-woven fabric 1 and bonded to the upper surface of the composite absorbent cotton core 2. The antibacterial coating is applied on the upper surface of the breathable bottom film 3 and bonded to the lower surface of the composite absorbent cotton core 2. After the antibacterial coating is cured, a sanitary product is obtained.

[0027] In step S1, the main purpose is to obtain the surface non-woven fabric 1, the upper wrapping non-woven fabric 21, the lower wrapping non-woven fabric 23, and the breathable bottom film 3, wherein the surface non-woven fabric 1 is preferably a spunlace non-woven fabric, which can be made of starch-modified polypropylene melt-sprayed to form fibers, which are then mixed with cotton fibers and laid into a net and then reinforced by a spunlace process to form a spunlace non-woven fabric as the surface non-woven fabric 1; the upper wrapping non-woven fabric 21 is preferably a hot air non-woven fabric, which can be made of starch-modified polyethylene and starch-modified polypropylene as raw materials, and starch-modified polypropylene is used as the core layer and starch-modified polyethylene is used as the skin layer to make a skin-core The two-component fiber structure is combed and laid into a web, and then fixed by hot air to obtain a hot air non-woven fabric and used as the upper wrapping non-woven fabric 21; the lower wrapping non-woven fabric 23 is preferably dust-free paper, and starch-modified polypropylene can be melted and sprayed to form fibers, which are then mixed with wood pulp and cotton pulp and laid into a web and then reinforced by a needle punching process to form dust-free paper and used as the lower wrapping non-woven fabric 23; the breathable bottom film 3 is preferably a polyethylene breathable film, and starch-modified polyethylene can be mixed with calcium carbonate powder and heated and melted, extruded, cast, and stretched to obtain a polyethylene breathable film as the breathable bottom film 3.

[0028] In step S2, the degradation promoting solution contains sodium alginate, glycerol, a surfactant, sterile water and degradable microparticles 52, and the encapsulating solution includes the following components in mass percentage: 2% to 5% sodium alginate, 5% to 10% glycerol, 0.1% to 1% surfactant, and the balance is sterile water, and the surfactant is selected from one of polyoxyethylene alkylphenol ether and polyoxyethylene fatty alcohol ether; wherein, sodium alginate and glycerol can form a protective effect on the degradable microparticles, and sodium alginate can also solidify the dried encapsulating solution to form an outer shell 51 and encapsulate the degradable microparticles 52 to form degradation promoting particles 5, the surfactant can improve the dispersibility of the degradable microparticles 52 in the solution and make the degradation promoting solution more easily adhere to the cotton fiber surface, and the sterile water can prevent the introduction of miscellaneous bacteria into the solution.

[0029] In step S3, clean cotton fibers are evenly laid in a molding device such as a mold to form a cotton fiber layer. The cotton fiber layer can be provided with two or more layers, and a degradation-promoting solution is sprayed between two adjacent cotton fiber layers so that the degradation-promoting solution is attached to the surface of the cotton fibers in the form of droplets. After at least two cotton fiber layers are squeezed and fixed into shape, they are dried by freeze-drying technology to obtain a cotton core layer 22. Freeze-drying is beneficial to better ensure the activity of the degradation particles 52. The droplet-shaped degradation-promoting solution is dried inside the cotton core layer 22 to form a plurality of degradation-promoting particles 5.

[0030] It should be noted that if Figure 2 As shown, the degradation particles 52 are selected from Bacillus subtilis spores, and the mass ratio of the degradation particles 52 to the outer shell 51 in the degradation-promoting particles 5 is 1: (2-10); the degradation-promoting particles 5 undergo a drying process during the solidification and molding process, and the Bacillus subtilis spores are dormant inside them but still remain active. During the use of the sanitary product, it is necessary to absorb liquids such as menstrual blood through the composite absorbent cotton core 2. These liquids will be absorbed by the degradation-promoting particles 5 and a moist environment will be formed inside them. In addition, menstrual blood contains a certain amount of nutrients. When the sanitary product is used up and discarded, the moist environment will activate the Bacillus subtilis spores to germinate and grow into Bacillus subtilis with nutrients as nutrients. The Bacillus subtilis gradually grows inside the sanitary product to form a rich microbial community. These microbial communities can promote the degradation of the surface non-woven fabric 1, the upper wrapping non-woven fabric 21, the cotton core layer 22, the lower wrapping non-woven fabric 23, the breathable bottom film 3, etc. in the sanitary product, and can increase the degradation rate of the sanitary product.

[0031] Furthermore, the inactivated probiotics in the antibacterial coating are preferably inactivated Bacillus subtilis. The inactivated probiotics can inhibit the growth of harmful bacteria and promote the growth of probiotics, thereby maintaining the colony balance of the environment. When inactivated Bacillus subtilis is added to the antibacterial coating, the antibacterial coating 4 cooperates with the Bacillus subtilis spores to efficiently promote the growth of Bacillus subtilis inside the discarded sanitary products, so that a large number of Bacillus subtilis colonies can be reproduced faster inside the sanitary products, thereby increasing the degradation rate of the sanitary products.

[0032] In step S4, the surface non-woven fabric 1, the upper wrapping non-woven fabric 21, the lower wrapping non-woven fabric 23, the breathable bottom film 3, and the cotton core layer 22 obtained in the above steps S1, S2, and S3 are bonded and compounded by hot melt adhesive or antibacterial coating to produce the sanitary product of the present invention. The hot melt adhesive is preferably made of degradable materials. At the same time, the surface non-woven fabric 1, the upper wrapping non-woven fabric 21, the cotton core layer 22, the lower wrapping non-woven fabric 23, the breathable bottom film 3, and the antibacterial coating are all made of degradable materials, so that the sanitary product can be completely degraded after use and discarded, effectively alleviating the problem of plastic pollution.

[0033] In summary, the sanitary products of the present invention are provided with two layers of antibacterial coating 4 inside, which has good antibacterial properties, and the surface non-woven fabric 1, the upper wrapping non-woven fabric 21, the cotton core layer 22, the lower wrapping non-woven fabric 23, and the breathable bottom film 3 are all made of degradable materials, so that the sanitary products can be completely degraded, which is conducive to alleviating the increasingly serious plastic pollution problem. At the same time, when the degradation-promoting particles 5 absorb liquid, they will activate the degradation particles 52 and grow Bacillus subtilis, and the antibacterial coating 4 can promote Bacillus subtilis to form a dominant bacterial community. By accelerating the degradation rate of degradable materials by Bacillus subtilis, the degradation rate of sanitary products discarded after use can be increased, and the plastic pollution problem can be effectively alleviated.

[0034] The present invention is further described below by way of examples and comparative examples.

[0035] Example 1

[0036] The starch-modified polypropylene fiber and the cotton fiber are mixed in a mass ratio of 1:1, opened, combed, laid into a web, and then fixed by a spunlace process to obtain a spunlace nonwoven fabric; Using starch-modified polyethylene and starch-modified polypropylene as raw materials, using starch-modified polypropylene as the core layer and starch-modified polyethylene as the skin layer to make a bi-component fiber with a core-skin structure, and then opening, combing, laying the bi-component fiber into a web and fixing it with hot air to obtain a hot air non-woven fabric; Starch-modified polypropylene melt fiber, wood pulp and cotton pulp are mixed in a mass ratio of 1:1:1, opened, combed, laid into a web and then reinforced by a needle punching process to form dust-free paper; Starch-modified polyethylene and calcium carbonate powder are mixed in a mass ratio of 1:0.05, and then heated, melted, extruded, cast, and stretched to obtain a polyethylene breathable film; The inactivated Bacillus subtilis and the probiotic protective agent are mixed and stirred to obtain a probiotic suspension, and the probiotic suspension is mixed and stirred to obtain a first antibacterial coating, wherein the first antibacterial coating comprises, by mass percentage, 70% of the polyvinyl alcohol water-based adhesive, 10% of the inactivated Bacillus subtilis, and 20% of the probiotic protective agent; 90% of polyvinyl alcohol water-based adhesive, 5% of polyhexamethylene guanidine, and 5% of tea tree oil are mixed and stirred to obtain a second antibacterial coating; 4% sodium alginate, 8% glycerol, 0.5% surfactant, and 87.5% sterile water are mixed and stirred uniformly to obtain a coating solution, and 50% of the mass of Bacillus subtilis spores are dispersed in the coating solution and stirred uniformly to obtain a degradation-promoting solution; cotton fibers are evenly laid to form a first cotton fiber layer, and the degradation-promoting solution is evenly sprayed on the upper surface of the first cotton fiber layer, and then the cotton fibers are evenly laid on the upper surface of the first cotton fiber layer to form a second cotton fiber layer, and the first cotton fiber layer and the second cotton fiber layer are extruded and dried to obtain a first cotton core layer, and the dry weight of the degradation-promoting solution sprayed in the first cotton core layer is 2 gsm; 4% sodium alginate, 8% glycerol, 0.5% surfactant and 87.5% sterile water are mixed and stirred in percentage by mass to obtain a coating solution; cotton fibers are evenly laid to form a first cotton fiber layer, the coating solution is evenly sprayed on the upper surface of the first cotton fiber layer, and then the cotton fibers are evenly laid on the upper surface of the first cotton fiber layer to form a second cotton fiber layer, the first cotton fiber layer and the second cotton fiber layer are extruded and formed, and then dried to obtain a second cotton core layer, and the dry weight of the coating solution sprayed in the second cotton core layer is 2gsm.

[0037] Example 2

[0038] The hot air non-woven fabric, the first cotton core layer, and the dust-free paper are bonded and compounded in sequence by hot melt adhesive to obtain a composite absorbent cotton core; the first antibacterial coating is coated on the surface of the polyethylene breathable film and then bonded to the lower surface of the dust-free paper of the composite absorbent cotton core; the first antibacterial coating is coated on the surface of the spunlace non-woven fabric and then bonded to the upper surface of the hot air non-woven fabric of the composite absorbent cotton core; and the sanitary product is obtained after the first antibacterial coating is cured.

[0039] Comparative Example 1 The hot air non-woven fabric, the first cotton core layer, and the dust-free paper are bonded and compounded in sequence by hot melt adhesive to obtain a composite absorbent cotton core; the surface of the polyethylene breathable film is coated with a polyvinyl alcohol-based water-based adhesive and then bonded to the lower surface of the dust-free paper of the composite absorbent cotton core; the surface of the spunlace non-woven fabric is coated with a polyvinyl alcohol-based water-based adhesive and then bonded to the upper surface of the hot air non-woven fabric of the composite absorbent cotton core; and the sanitary product is obtained after the polyvinyl alcohol-based water-based adhesive is cured.

[0040] Comparative Example 2 The hot air non-woven fabric, the second cotton core layer, and the dust-free paper are bonded and compounded in sequence by hot melt adhesive to obtain a composite absorbent cotton core; the first antibacterial coating is coated on the surface of the polyethylene breathable film and then bonded to the lower surface of the dust-free paper of the composite absorbent cotton core; the first antibacterial coating is coated on the surface of the spunlace non-woven fabric and then bonded to the upper surface of the hot air non-woven fabric of the composite absorbent cotton core; and the sanitary product is obtained after the first antibacterial coating is cured.

[0041] Comparative Example 3 The hot air non-woven fabric, the first cotton core layer, and the dust-free paper are bonded and compounded in sequence by hot melt adhesive to obtain a composite absorbent cotton core; the second antibacterial coating is coated on the surface of the polyethylene breathable film and then bonded to the lower surface of the dust-free paper of the composite absorbent cotton core; the second antibacterial coating is coated on the surface of the spunlace non-woven fabric and then bonded to the upper surface of the hot air non-woven fabric of the composite absorbent cotton core; and the sanitary product is obtained after the second antibacterial coating is cured.

[0042] Comparative Example 4 The hot air non-woven fabric, the second cotton core layer, and the dust-free paper are bonded and compounded in sequence by hot melt adhesive to obtain a composite absorbent cotton core; the surface of the polyethylene breathable film is coated with a polyvinyl alcohol-based water-based adhesive and then bonded to the lower surface of the dust-free paper of the composite absorbent cotton core; the surface of the spunlace non-woven fabric is coated with a polyvinyl alcohol-based water-based adhesive and then bonded to the upper surface of the hot air non-woven fabric of the composite absorbent cotton core; and the sanitary product is obtained after the polyvinyl alcohol-based water-based adhesive is cured.

[0043] It should be noted that Example 2 and Comparative Examples 1-4 all use the spunlace nonwoven fabric, hot air nonwoven fabric, dust-free paper, polyethylene breathable film, first antibacterial coating, second antibacterial coating, first cotton core layer, and second cotton core layer obtained in Example 1, and the coating dry weight of the first antibacterial coating and the second antibacterial coating is 2 gsm.

[0044] The sanitary products obtained in the above-mentioned embodiments and comparative examples were subjected to a degradation ability test: the sanitary products were placed in the same environment after absorbing 50 mL of menstrual blood simulation fluid, and different sanitary products needed to be isolated from each other. After 120 days, the sanitary products were dried and weighed; the weight of the sanitary products after drying was compared with the weight of the sanitary products before the test, and the weight loss rate of the sanitary products was calculated. The results are shown in Table 1 below:

[0045] Table 1 The data in Table 1 are explained, and Comparative Example 4 is used as a blank control group. The higher the weight loss rate, the more weight the sanitary product loses after the test, which means that its degradation efficiency is higher; Example 2 is compared with Comparative Example 1. Since the first antibacterial coating containing inactivated Bacillus subtilis is used in Example 2, it is beneficial for Bacillus subtilis to form a dominant flora faster, so the degradation efficiency of the sanitary product is higher; Example 2 is compared with Comparative Example 2. Since there are no Bacillus subtilis spores inside the second cotton core layer in Comparative Example 2, it is difficult to quickly form an initial probiotic flora. The probiotics need to grow slowly and enrich inside the sanitary napkin to form a relatively rich flora. Therefore, the degradation efficiency of the sanitary product is low; in Comparative Example 3, the second antibacterial coating is based on polyhexamethylene guanidine and tea tree oil to achieve an antibacterial effect, but these two materials will also inhibit the growth of probiotics, resulting in the degradable materials in the sanitary products being difficult to rely on the microbial environment for degradation, so the degradation rate of the sanitary products is low.

[0046] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An antibacterial sanitary product containing a degradable material, comprising a surface nonwoven fabric (1), a composite absorbent cotton core (2), a breathable bottom film (3), and an antibacterial coating (4), characterized in that: The surface non-woven fabric (1), the composite absorbent cotton core (2), and the breathable bottom film (3) are arranged in sequence from top to bottom, and the antibacterial coating (4) is provided with two layers, and the two layers of the antibacterial coating (4) are respectively arranged on the lower surface of the surface non-woven fabric (1) and the upper surface of the breathable bottom film (3); The composite absorbent cotton core (2) is composed of an upper wrapping non-woven fabric (21), a cotton core layer (22), and a lower wrapping non-woven fabric (23) from top to bottom, wherein a plurality of degradation-promoting particles (5) are wrapped in the cotton core layer (22), and the degradation-promoting particles (5) are composed of an outer shell (51) on the surface wrapping a plurality of degradation particles (52) inside.

2. The antibacterial sanitary product containing degradable materials according to claim 1, characterized in that: The degradation particles (52) are selected from Bacillus subtilis spores, and the mass ratio of the degradation particles (52) to the outer shell (51) in the degradation-promoting particles (5) is 1:(2-10).

3. The antibacterial sanitary product containing degradable materials according to claim 1, characterized in that: The antibacterial coating (4) is formed by coating the antibacterial coating on the lower surface of the surface non-woven fabric (1) and the upper surface of the breathable base film (3) and then curing the coating. The antibacterial coating is composed of a water-based adhesive, inactivated probiotics, and a probiotic protective agent.

4. The antibacterial sanitary product containing degradable materials according to claim 3, characterized in that: The antibacterial coating comprises the following components by mass percentage: 55% to 85% of a water-based adhesive, 5% to 15% of inactivated probiotics, and 10% to 30% of a probiotic protective agent.

5. The antibacterial sanitary product containing degradable materials according to claim 3, characterized in that: The water-based adhesive is selected from one of polyvinyl acetate adhesive, acrylic acid water-based adhesive, water-based polyurethane adhesive, and polyvinyl alcohol water-based adhesive.

6. A method for preparing an antibacterial sanitary product containing a degradable material according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1, heating and melting the biodegradable plastic, spinning, laying into a net, reinforcing, and cutting to obtain a surface non-woven fabric, an upper wrapping non-woven fabric, and a lower wrapping non-woven fabric; mixing the biodegradable plastic with a filler, heating and melting, extruding, casting, stretching, and cutting to obtain a breathable bottom film; S2, mixing sodium alginate, glycerol, a surfactant and sterile water to obtain a coating solution, dispersing the degradable microparticles in the coating solution and stirring evenly to obtain a degradation-promoting solution; S3, evenly laying cotton fibers to form a first cotton fiber layer, evenly spraying the degradation-promoting solution on the upper surface of the first cotton fiber layer, evenly laying cotton fibers on the upper surface of the first cotton fiber layer to form a second cotton fiber layer, extruding the first cotton fiber layer and the second cotton fiber layer and then drying them to obtain a cotton core layer, and the degradation-promoting solution is dried inside the cotton core layer to form a plurality of degradation-promoting particles; S4. The upper wrapping non-woven fabric, the cotton core layer, and the lower wrapping non-woven fabric are bonded sequentially by hot-melt adhesive to obtain a composite absorbent cotton core, the antibacterial coating is applied on the lower surface of the surface non-woven fabric and bonded to the upper surface of the composite absorbent cotton core, the antibacterial coating is applied on the upper surface of the breathable bottom film and bonded to the lower surface of the composite absorbent cotton core, and the sanitary product is obtained after the antibacterial coating is cured.

7. The method for preparing antibacterial sanitary products containing degradable materials according to claim 6, characterized in that: The biodegradable plastic is selected from one of completely biodegradable plastic and destructive biodegradable plastic; the completely biodegradable plastic is selected from one or more of polycaprolactone, polylactic acid, polybutylene succinate, and polyhydroxyalkanoate; the destructive biodegradable plastic is selected from one or more of starch-modified polyethylene, starch-modified polypropylene, and starch-modified polyester.

8. The method for preparing antibacterial sanitary products containing degradable materials according to claim 6, characterized in that: The encapsulation solution comprises the following components by mass percentage: 2% to 5% sodium alginate, 5% to 10% glycerol, 0.1% to 1% surfactant, and the balance is sterile water.

9. The method for preparing antibacterial sanitary products containing degradable materials according to claim 6, characterized in that: The surfactant is selected from polyoxyethylene alkylphenol ether and polyoxyethylene fatty alcohol ether.

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