Method for manufacturing a biological antibacterial nonwoven fabric

Abstract

The application discloses a kind of biological antibacterial non-woven fabric production method, belong to non-woven fabric production technical field, comprising the following steps: S1, acrylic acid salt, antimicrobial polypeptide, initiator, surfactant are dissolved in deionized water and stirred uniformly to obtain aqueous solution, S2, emulsifier is dissolved in organic solvent and stirred uniformly to obtain oil phase solution, S3, aqueous solution and oil phase solution are mixed uniformly and emulsified into emulsion and heated to react, after reaction is finished and cooling, product is filtered, washed, dried to obtain antibacterial microparticle, S4, antibacterial microparticle, synthetic resin, functional additive are mixed uniformly after heating and melt and are spun, stretched to form fiber silk, then fiber silk is curled, dried, cut to obtain antibacterial fiber, S5, antibacterial fiber is opened, carded and heated to make antibacterial fiber heat bonding, after cooling, antibacterial non-woven fabric is obtained;The antibacterial non-woven fabric of the application has good antibacterial durability and safety.

Description

A method for producing a bio-antibacterial nonwoven fabric Technical Field

[0001] This invention relates to the field of nonwoven fabric manufacturing technology, specifically to a method for manufacturing a bio-antibacterial nonwoven fabric. Background Technology

[0002] Nonwoven fabrics are widely used in personal hygiene and public health protection, such as baby diapers, sanitary napkins, medical masks, surgical gowns, and surgical pads. These applications often involve environments where bacteria can easily grow and whose growth needs to be prevented. As people increasingly value personal and public health, the antibacterial properties of nonwoven fabrics are becoming increasingly important. Currently, antibacterial coatings are typically applied to the surface of the nonwoven fabric or its fibers to create an antibacterial layer. However, the surface of nonwoven fibers is usually quite smooth, posing a risk that the antibacterial coating may not adhere properly and could easily peel off. Once peeled off, the coating may migrate into the body and harm human health. Furthermore, the antibacterial coating may contain harmful substances such as heavy metals and organic solvents, potentially threatening human health. Therefore, even though antibacterial coatings enhance the antibacterial properties of nonwoven fabrics, they also increase potential health risks.

[0003] Chinese Patent Publication No. CN108998895A discloses a method for antibacterial medical antibacterial nonwoven fabric. This medical antibacterial nonwoven fabric comprises component A, component B, and component C. Component A consists of the following parts by weight: 60-80 parts modified polyamide and 40-60 parts modified polyester. Component B is viscose fiber. Component C consists of the following parts by weight: 6-11 parts nano-silver chitosan antibacterial agent, 5-15 parts carboxylated styrene-butadiene latex, and 80-100 parts water. The weight ratio of components A, B, and C is specified in the patent description. The ratio is 1:3:5. Specifically, the antibacterial nonwoven fabric is produced by mixing modified polyamide and modified polyester spunlace with viscose fiber, soaking it in a mixture of nano-silver chitosan antibacterial agent and carboxylated styrene-butadiene latex, and then using a self-adhesive hydroentangling process. Although the antibacterial properties of this antibacterial nonwoven fabric are obtained through the coating formed by the nano-silver chitosan antibacterial agent and carboxylated styrene-butadiene latex on the fiber surface, silver is a heavy metal, and the coating is not firmly attached to the nonwoven fabric fibers, which can easily lead to peeling off. The heavy metal silver in the coating can harm human health, so there is still room for improvement. Summary of the Invention

[0004] To address the technical deficiencies in the background art, this invention proposes a method for manufacturing a bio-antibacterial nonwoven fabric, which solves the aforementioned technical problems and meets practical needs. The specific technical solution is as follows:

[0005] A method for manufacturing a bio-antibacterial nonwoven fabric includes the following steps:

[0006] S1. Dissolve 10-30 parts by weight of acrylate, 15-25 parts by weight of antibacterial peptide, 0.2-1 parts by weight of initiator and 0.2-1 parts by weight of surfactant in 30-70 parts by weight of deionized water and stir until homogeneous to obtain an aqueous solution.

[0007] S2. Dissolve 1-3 parts by weight of emulsifier in 80-120 parts by weight of organic solvent and stir until homogeneous to obtain an oil phase solution;

[0008] S3. Mix the aqueous solution obtained in step S1 with the oil solution obtained in step S2 and emulsify them into an emulsion. Introduce nitrogen into the emulsion and heat it to carry out the reaction. After the reaction is completed and cooled, filter, wash and dry the product to obtain antibacterial microparticles.

[0009] S4. After mixing antibacterial microparticles, synthetic resin, and functional additives evenly, heat them to a molten state. Spin and stretch the melt to form fiber filaments. Then, after the fiber filaments are curled, dried, and cut, antibacterial fibers composed of several antibacterial microparticles wrapped in fibrous synthetic resin are obtained.

[0010] S5. After opening and combing the antibacterial fibers, heat them to bond them together, and after cooling, form an antibacterial nonwoven fabric composed of several antibacterial fibers.

[0011] As a further technical solution of the present invention, the acrylate is selected from sodium acrylate, sodium methacrylate, and potassium acrylate, and the initiator is selected from sodium persulfate, potassium persulfate, and ammonium persulfate.

[0012] As a further technical solution of the present invention, the antibacterial polypeptide is selected from one or more of the following: cephalosporin, toad peptide, indigo antibacterial peptide, liver antibacterial peptide, defensin, lactoferrin peptide, sebaceous gland peptide, pramipexole, and bacitracin.

[0013] As a further technical solution of the present invention, the surfactant is selected from one of polyoxyethylene sorbitan monostearate and polyoxyethylene dehydrated sorbitan monolaurate.

[0014] As a further technical solution of the present invention, the emulsifier is selected from one of glyceryl stearate, fatty alcohol polyoxyethylene ether, and alkylbenzene sulfonate, and the organic solvent is selected from one of cyclohexanone, chlorobenzene, and dichlorobenzene.

[0015] As a further technical solution of the present invention, in step S3, the aqueous solution and the oil solution are mixed and then emulsified into an emulsion by high-frequency ultrasonic vibration. The frequency of ultrasonic emulsification is 40-60kHz and the amplitude is 30-60μm.

[0016] As a further technical solution of the present invention, in step S3, the pH of the emulsion needs to be adjusted to 7-8 by using a buffer, wherein the buffer is selected from one of sodium bicarbonate buffer, sodium carbonate buffer, sodium dihydrogen phosphate buffer, and disodium hydrogen phosphate buffer.

[0017] As a further technical solution of the present invention, in step S3, the temperature for heating the emulsion to react is 60-70℃ and the reaction time is 3-5h.

[0018] As a further technical solution of the present invention, the synthetic resin is selected from one of polypropylene resin, polyethylene resin, polyvinyl chloride resin, polyurethane resin, and polyester resin.

[0019] As a further technical solution of the present invention, the functional additives include dispersants, antioxidants, and flow aids. The dispersant is selected from one of polyvinylpyrrolidone, polyethylene glycol, silicates, and phosphates. The antioxidant is selected from one of BHT, dilauryl thiodipropionate, DEHA, DPPD, and UV-P. The flow aid is selected from one of zinc stearate, calcium stearate, polydimethylsiloxane, oleamide, or stearamide.

[0020] The beneficial effects of this invention are as follows:

[0021] The antibacterial nonwoven fabric of this invention consists of synthetic resin fibers and several antibacterial microparticles embedded in their surface. The sodium polyacrylate in the antibacterial microparticles absorbs moisture that comes into contact with the antibacterial nonwoven fabric. Sodium polyacrylate has good water absorption, which improves the water absorption and surface dryness of the antibacterial nonwoven fabric. By creating a dry environment on the surface of the antibacterial nonwoven fabric, it inhibits bacterial growth. The antibacterial peptides in the antibacterial microparticles have broad-spectrum and highly effective bactericidal activity, enabling the antibacterial nonwoven fabric to effectively kill various harmful bacteria and giving it good antibacterial properties. At the same time, the antibacterial microparticles are firmly embedded in the antibacterial fibers, so they are not easy to fall off during use. Furthermore, both sodium polyacrylate and antibacterial peptides are safe and non-toxic materials, which improves the antibacterial durability and safety of the antibacterial nonwoven fabric. Detailed Implementation

[0022] The embodiments of the present invention will be described below with reference to relevant examples. The embodiments of the present invention are not limited to the following examples, and the present invention relates to relevant necessary components in this technical field, which should be regarded as well-known technology in this technical field and can be known and mastered by those skilled in this technical field.

[0023] A method for manufacturing a bio-antibacterial nonwoven fabric includes the following steps:

[0024] S1. Dissolve 10-30 parts by weight of acrylate, 15-25 parts by weight of antibacterial peptide, 0.2-1 parts by weight of initiator and 0.2-1 parts by weight of surfactant in 30-70 parts by weight of deionized water and stir until homogeneous to obtain an aqueous solution.

[0025] S2. Dissolve 1-3 parts by weight of emulsifier in 80-120 parts by weight of organic solvent and stir until homogeneous to obtain an oil phase solution;

[0026] S3. Mix the aqueous solution obtained in step S1 with the oil solution obtained in step S2 and emulsify them into an emulsion. Introduce nitrogen into the emulsion and heat it to carry out the reaction. After the reaction is completed and cooled, filter, wash and dry the product to obtain antibacterial microparticles.

[0027] S4. After mixing antibacterial microparticles, synthetic resin, and functional additives evenly, heat them to a molten state. Spin and stretch the melt to form fiber filaments. Then, after the fiber filaments are curled, dried, and cut, antibacterial fibers composed of several antibacterial microparticles wrapped in fibrous synthetic resin are obtained.

[0028] S5. After opening and combing the antibacterial fibers, heat them to bond them together, and after cooling, form an antibacterial nonwoven fabric composed of several antibacterial fibers.

[0029] Step S1 of the present invention specifically involves dissolving 20 parts by mass of acrylate, 20 parts by mass of antibacterial peptide, 0.5 parts by mass of initiator, and 0.5 parts by mass of surfactant in 50 parts by mass of deionized water and stirring evenly to obtain an aqueous phase solution; Step S2 specifically involves dissolving 2 parts by mass of emulsifier in 100 parts by mass of organic solvent and stirring evenly to obtain an oil phase solution; Step S3 specifically involves mixing all the aqueous phase solutions obtained in Step S1 with all the oil phase solutions obtained in Step S2 and emulsifying them into an emulsion, introducing nitrogen gas into the emulsion and heating it to carry out an interfacial free radical polymerization reaction. During the reaction, some gel-state products will precipitate. After the reaction is completed and cooled, a large amount of gel-state products will precipitate. Then, the product is filtered to obtain a solid. The solid is washed to remove excess solvent and dried to obtain a powdered solid product, antibacterial microparticles.

[0030] After adopting the above operation, it should be noted that the acrylate is selected from sodium acrylate, sodium methacrylate, and potassium acrylate, preferably sodium acrylate. Sodium acrylate is dissolved in deionized water to form an aqueous phase. The aqueous phase and oil phase are mixed to make an emulsion. Under the action of an initiator, an interfacial free radical polymerization reaction occurs. Sodium acrylate is polymerized to form sodium polyacrylate. The initiator is selected from sodium persulfate, potassium persulfate, and ammonium persulfate. All three components have good water solubility as initiators. The initiator is dissolved in deionized water and decomposes to generate free radicals. Under heating conditions, sodium acrylate generates chains at the interface between the aqueous phase and the oil phase and polymerizes into sodium polyacrylate.

[0031] The aqueous solution of this invention contains dissolved antimicrobial peptides. These peptides exhibit good thermal stability and broad-spectrum, highly effective bactericidal activity. Their antimicrobial activity primarily targets the cell membrane of microorganisms, forming transmembrane ion channels that disrupt the cell membrane's integrity, causing leakage of cell contents and ultimately killing the cell. The antimicrobial peptides show good inhibitory effects against common pathogens such as *Escherichia coli*, *Staphylococcus aureus*, *Candida albicans*, and *Bacillus subtilis*. During the interfacial free radical polymerization of sodium acrylate, the resulting product, sodium polyacrylate, has low solubility. When the sodium polyacrylate content reaches a certain level, it precipitates in the aqueous phase, forming gel-like sodium polyacrylate. After the reaction ends and cooling, the solubility of sodium polyacrylate in the aqueous phase further decreases, resulting in the formation of more gel-like sodium polyacrylate. Simultaneously, some of the antimicrobial peptides are encapsulated within the precipitated sodium polyacrylate. The emulsion is filtered, washed, and dried to remove excess water, yielding solid antimicrobial microparticles. The final structure of the antimicrobial microparticles consists of an outer shell of sodium polyacrylate encapsulating the internal antimicrobial peptides, which contribute to their excellent antimicrobial properties.

[0032] The emulsion of this invention is a water-in-oil emulsion. The organic solvent is preferably a solvent that is immiscible with water and cannot dissolve sodium acrylate and sodium polyacrylate. The oil phase is the continuous phase in the emulsion, while the aqueous phase exists in the form of small droplets. The emulsifier is preferably lipophilic, which forms a thin film at the interface between the oil and aqueous phases and encapsulates the small droplets of aqueous phase. The surfactant is preferably a nonionic surfactant, which is suitable for water-in-oil emulsion systems because it neither ionizes nor generates ions, thereby reducing the interaction between the aqueous phase and other components in the oil phase and helping to maintain the stability of the emulsion. Several micron-sized aqueous droplets are stably formed in the emulsion. The aqueous droplets in the emulsion can undergo interfacial free radical polymerization to form several independent sodium polyacrylate gel particles. During the precipitation process of sodium polyacrylate, antimicrobial peptides in the aqueous solution are encapsulated to form gel-state antimicrobial particles. After drying to remove water from the sodium polyacrylate, solid antimicrobial particles are obtained.

[0033] Steps S4 and S5 of this invention are the molding process of antibacterial nonwoven fabric. Specifically, 12 parts by weight of antibacterial microparticles, 60 parts by weight of synthetic resin, and 1 part by weight of functional additives are mixed evenly and then heated to a molten state. Sodium polyacrylate can not decompose in an environment of 300°C. The melting temperature of synthetic resin is preferably below 300°C. The synthetic resin is selected from one of polypropylene resin, polyethylene resin, polyvinyl chloride resin, polyurethane resin, and polyester resin, preferably polypropylene resin. After the polypropylene resin is heated to a molten state, the antibacterial microparticles can still be dispersed in the melt as solid microparticles. The functional additives include dispersants and other additives that promote the uniform dispersion of antibacterial microparticles in the melt, so that the antibacterial microparticles are uniformly dispersed in the polypropylene melt. The melt is first made into antibacterial fibers composed of several antibacterial microparticles wrapped in fibrous polypropylene resin. Then, the antibacterial fibers are made into antibacterial nonwoven fabric with a fiber web structure.

[0034] It should be noted that during the manufacturing process of antibacterial nonwoven fabric, the melt is spun into fibers through a spinneret or spinneret. While the fibers are still at a relatively high temperature and possess a certain degree of plasticity, they are stretched to reduce their diameter and increase their fiber orientation and strength. Simultaneously, the polypropylene resin thickness is lower at locations where antibacterial microparticles are present within the fibers. During stretching, these locations form microporous structures or expose part of the antibacterial microparticles on the fiber surface, creating a structure where the antibacterial microparticles are embedded within the polypropylene fibers. After stretching and cooling, the fibers are crimped to increase their softness and bulkiness. The crimped fibers are then dried to remove excess moisture and solvent, ensuring the fibers remain dry. The process involves several steps: First, the dried fibers are cut to a length suitable for subsequent processing. Second, the antibacterial fibers are opened to increase their looseness. Third, the opened fibers are carded to remove impurities and clumps, ensuring a neat arrangement and forming a uniform fiber web. Fourth, the carded fiber web is heated to soften the antibacterial fibers, causing them to become sticky and bond together, forming a stable fiber web structure. This process can be achieved through hot pressing, hot rolling, or other heating methods. Finally, the bonded fiber web is cooled to re-solidify the antibacterial fibers and maintain a more stable fiber web structure, resulting in the antibacterial nonwoven fabric.

[0035] The antibacterial nonwoven fabric of this invention consists of synthetic resin fibers and several antibacterial microparticles embedded in their surface. The sodium polyacrylate in the antibacterial microparticles absorbs moisture that comes into contact with the antibacterial nonwoven fabric. Sodium polyacrylate has good water absorption, which improves the water absorption and surface dryness of the antibacterial nonwoven fabric. By creating a dry environment on the surface of the antibacterial nonwoven fabric, it inhibits bacterial growth. The antibacterial peptides in the antibacterial microparticles have broad-spectrum and highly effective bactericidal activity, enabling the antibacterial nonwoven fabric to effectively kill various harmful bacteria and giving it good antibacterial properties. At the same time, the antibacterial microparticles are firmly embedded in the antibacterial fibers, so they are not easy to fall off during use. Furthermore, both sodium polyacrylate and antibacterial peptides are safe and non-toxic materials, which improves the antibacterial durability and safety of the antibacterial nonwoven fabric.

[0036] As one of the preferred embodiments of the present invention, the antimicrobial polypeptide is selected from one or more of the following: cephalosporin, toad peptide, indigo antimicrobial peptide, liver antimicrobial peptide, defensin, lactoferrin peptide, sebaceous gland peptide, pramipexole, and bacitracin.

[0037] The antimicrobial peptides of this invention include, but are not limited to, the components listed above. The antimicrobial principle of the antimicrobial peptides can be regarded as a biological antimicrobial mechanism. The antimicrobial peptides have a unique antimicrobial mechanism. Unlike traditional antibiotics, they do not target specific points but directly target microbial cells, making it difficult for microorganisms to develop drug resistance. At the same time, the antimicrobial peptides have a broad antimicrobial spectrum, inhibiting viruses, bacteria, fungi, protozoa, and tumor cells, but without inhibiting normal mammalian cells. They are safe, harmless, and highly effective antimicrobial components. Antimicrobial nonwoven fabrics made using antimicrobial peptides have good antimicrobial properties while being safe and harmless to the human body.

[0038] As one of the preferred embodiments of the present invention, the surfactant is selected from polyoxyethylene sorbitan monostearate and polyoxyethylene dehydrated sorbitan monolaurate.

[0039] The surfactant in the aqueous solution of this invention is selected from either polyoxyethylene sorbitan monostearate or polyoxyethylene dehydrated sorbitan monolaurate. Both of these components can be used as nonionic surfactants. Such surfactants are suitable for water-in-oil emulsion systems because they neither ionize nor generate ions, thereby reducing the interaction between the aqueous phase and other components in the oil phase and helping to maintain the stability of the emulsion.

[0040] As one of the preferred embodiments of the present invention, the emulsifier is selected from one of glyceryl stearate, fatty alcohol polyoxyethylene ether, and alkylbenzene sulfonate, and the organic solvent is selected from one of cyclohexanone, chlorobenzene, and dichlorobenzene.

[0041] The organic solvent of this invention is selected from one of cyclohexanone, chlorobenzene, and dichlorobenzene. These components are all immiscible with water and cannot dissolve sodium acrylate and sodium polyacrylate. This can prevent the product of the polymerization reaction, sodium polyacrylate, from dissolving in the organic solvent. These organic solvents have high boiling points, which can prevent the volatilization of organic solvents during the reaction process from affecting the stability of the emulsion. The emulsifier is selected from one of glyceryl stearate, fatty alcohol polyoxyethylene ether, and alkylbenzene sulfonate. These components are all lipophilic emulsifiers. Through the lipophilicity of the emulsifier, a thin film is formed at the interface between the oil phase and the water phase, and the small droplets of the water phase are wrapped inside, thereby forming a stable water-in-oil emulsion system.

[0042] As one of the preferred embodiments of the present invention, in step S3, the aqueous solution and the oil solution are mixed and then emulsified into an emulsion by high-frequency ultrasonic vibration. The frequency of ultrasonic emulsification is 40-60kHz and the amplitude is 30-60μm.

[0043] In step S3 of this invention, after the aqueous solution and oil solution are mixed and stirred evenly, the mixture is emulsified into an emulsion by generating high-frequency ultrasonic vibrations through an ultrasonic emulsifier. During the emulsification process, the ultrasonic waves cause mechanical vibrations in the liquid, resulting in high-frequency pressure changes. These pressure changes lead to the formation and collapse of tiny bubbles inside the liquid. At the same time, the suspended substances in the liquid are dispersed into tiny particles by the shear force of the ultrasonic waves, forming a water-in-oil emulsion under the action of an oleophilic emulsifier. The preferred frequency of ultrasonic emulsification is 50 kHz, and the preferred amplitude is 45 μm. The higher frequency generates smaller aqueous droplets with a diameter of 1-7 μm, which can enable interfacial free radical polymerization to obtain micron-sized antibacterial microparticles. In addition, the lower amplitude avoids the generation of local high temperature or high pressure during the emulsification process, thereby preventing damage to the stability of the emulsion.

[0044] As one of the preferred embodiments of the present invention, in step S3, the pH of the emulsion needs to be adjusted to 7-8 using a buffer. The buffer is selected from one of sodium bicarbonate buffer, sodium carbonate buffer, sodium dihydrogen phosphate buffer, and disodium hydrogen phosphate buffer.

[0045] In this invention, the buffer is used to adjust the pH value of the emulsion. The pH value of the emulsion is preferably adjusted to 7.5 to maintain the activity and stability of the emulsion, ensure that the emulsion undergoes interfacial free radical polymerization at a normal rate, and improve the quality of the polymerization product.

[0046] In one of the preferred embodiments of the present invention, in step S3, the temperature at which the emulsion is heated to react is 60-70°C and the reaction time is 3-5 hours.

[0047] In step S3, heating the emulsion to above 60°C promotes the decomposition of the initiator to generate free radicals, thus initiating the interfacial free radical polymerization reaction. The time required to complete the entire reaction process is usually affected by the reaction rate, and the reaction can normally be completed within 3-5 hours. The specific time required to complete the reaction depends on the amount of sodium polyacrylate gel precipitated or the state of the emulsion.

[0048] As one of the preferred embodiments of the present invention, the functional additives include dispersants, antioxidants, and flow aids. The dispersant is selected from one of polyvinylpyrrolidone, polyethylene glycol, silicates, and phosphates. The antioxidant is selected from one of BHT, dilauryl thiodipropionate, DEHA, DPPD, and UV-P. The flow aid is selected from one of zinc stearate, calcium stearate, polydimethylsiloxane, oleamide, or stearamide.

[0049] One part of the functional additive of the present invention includes 0.5 parts of dispersant, 0.2 parts of antioxidant, and 0.3 parts of flow aid by mass. In the dispersant, polyvinylpyrrolidone and polyethylene glycol maintain the antibacterial microparticles in a dispersed state in the melt through steric hindrance effect. Silicates and phosphates enhance dispersibility by interacting with the surface of the antibacterial microparticles, all of which can make the antibacterial microparticles uniformly dispersed in the melt. The antioxidant can improve the thermal and light stability of the synthetic resin and improve the antioxidant properties of the antibacterial fiber. The flow aid can reduce the viscosity of the melt and improve its fluidity, thereby improving the processing performance of the melt and thus improving the spinning efficiency and quality.

[0050] The present invention will be further illustrated below through examples and comparative examples.

[0051] Example 1

[0052] S1. Dissolve 20 parts by weight of sodium acrylate, 20 parts by weight of cephalosporin, 0.5 parts by weight of sodium persulfate and 0.5 parts by weight of polyoxyethylene sorbitan monostearate in 50 parts by weight of deionized water and stir until homogeneous to obtain an aqueous solution.

[0053] S2. Dissolve 2 parts by weight of glyceryl stearate in 100 parts by weight of cyclohexanone and stir until homogeneous to obtain an oil phase solution;

[0054] S3. The aqueous solution obtained in step S1 and the oil solution obtained in step S2 are mixed evenly and emulsified into an emulsion under the action of ultrasound. Nitrogen gas is introduced into the emulsion and heated to 60°C for reaction. After the reaction is completed and cooled, the product is filtered, washed with anhydrous ethanol, and dried to obtain antibacterial microparticles.

[0055] S4. Mix 12 parts by weight of antibacterial microparticles, 60 parts of polypropylene resin, 0.5 parts of polyethylene glycol, 0.2 parts of BHT, and 0.3 parts of zinc stearate evenly and heat to a molten state. Spin and stretch the melt to form fiber filaments. Then, after the fiber filaments are curled, dried, and cut, antibacterial fibers composed of several antibacterial microparticles wrapped in fibrous synthetic resin are obtained.

[0056] S5. After opening and combing the antibacterial fibers, heat them to bond them together, and after cooling, form an antibacterial nonwoven fabric composed of several antibacterial fibers.

[0057] Comparative Example 1

[0058] The antibacterial nonwoven fabric is produced according to a Chinese patent (publication number: CN108998895A) using a method for producing antibacterial medical antibacterial nonwoven fabric, specifically including the following steps:

[0059] S1. Mix 8 parts by weight of modified polyamide and 6 parts by weight of modified polyester and then wet spin them into fiber filaments. Mix all the fiber filaments with 42 parts by weight of viscose fiber to obtain mixed fiber filaments.

[0060] S2. Mix 10 parts by weight of nano-silver chitosan antibacterial agent, 12 parts by weight of carboxylated styrene-butadiene latex, and 95 parts by weight of deionized water to obtain an antibacterial mixture.

[0061] S3. Soak the mixed fiber filaments from step S1 in the antibacterial mixture from step S2 for 1.5 hours, and then prepare the mixed filaments soaked in the antibacterial mixture into antibacterial nonwoven fabric through a self-adhesive hydroentangling process.

[0062] The antibacterial nonwoven fabrics obtained in Example 1 and Comparative Example 1 were subjected to the following operations: The antibacterial nonwoven fabrics were fixed in the working area of ​​a vibration testing machine. The vibration testing machine was used to vibrate at a frequency of 20 Hz and an amplitude of 1 mm for 10 minutes. It was observed whether solid powder fell off the antibacterial nonwoven fabric after vibration. If solid powder fell off, the powder was tested to see if it contained heavy metals. The test results are shown in Table 1 below:

[0063]

[0064] Table 1

[0065] In addition, the antibacterial nonwoven fabrics obtained in Example 1 and Comparative Example 1, as well as the antibacterial nonwoven fabrics subjected to vibration testing by the high-frequency vibration testing machine, were tested for antibacterial properties based on the standard document GB / T20944.2-2007 "Evaluation of antibacterial properties of textiles - Part 2: Absorption method". The test results are shown in Table 2 below:

[0066]

[0067] Table 2

[0068] The above-mentioned vibration test on the antibacterial nonwoven fabric simulated friction between the fabric and other objects during use, testing whether solid powder would fall off. According to the data in Table 1, the antibacterial nonwoven fabric in Comparative Example 1 exhibited solid powder falling off. Analysis of the solid powder revealed the presence of the heavy metal silver. The solid powder falling off during the vibration test was the antibacterial coating on the fiber surface. This antibacterial coating consists of nano-silver chitosan antibacterial material and carboxylated styrene-butadiene latex. This antibacterial coating adheres to the surface of the antibacterial nonwoven fabric fibers. The antibacterial nonwoven fabric exhibits poor adhesion, with solid powder detaching during vibration testing. This indicates a defect in the antibacterial coating during use. If used in products such as masks, the detached antibacterial coating may be inhaled, and the coating contains heavy metal silver, which could harm human health. In contrast, the antibacterial nonwoven fabric of Example 1 did not shed solid powder during testing. This fabric is composed of several antibacterial fibers with no coating on their surface. The antibacterial microparticles are firmly embedded within the fibers and do not easily fall off, ensuring the safety of the antibacterial nonwoven fabric.

[0069] According to the data in Table 2, before the vibration test, both the antibacterial nonwoven fabrics of Example 1 and Comparative Example 1 had good antibacterial properties, with an antibacterial rate of 99.9%. However, after the vibration test, the antibacterial nonwoven fabric of Comparative Example 1 showed reduced antibacterial properties due to the peeling of the antibacterial coating on its surface. The antibacterial rate against the three bacteria was only about 80%. It can be seen that this antibacterial nonwoven fabric could not maintain a good antibacterial rate during use. The antibacterial nonwoven fabric of Example 1 showed no significant changes after the vibration test, so it could maintain good antibacterial properties. It can be seen that this antibacterial nonwoven fabric could maintain a good antibacterial rate for a long time during use.

[0070] In summary, the antibacterial nonwoven fabric obtained based on the technical solution of this invention has high safety in use and can maintain a good antibacterial rate for a long time during use.

[0071] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for manufacturing a biological antibacterial nonwoven fabric, characterized in that, Includes the following steps: S1. Dissolve 10-30 parts by weight of acrylate, 15-25 parts by weight of antibacterial peptide, 0.2-1 parts by weight of initiator, and 0.2-1 parts by weight of surfactant in 30-70 parts by weight of deionized water and stir until homogeneous to obtain an aqueous phase solution; S2. Dissolve 1-3 parts by weight of emulsifier in 80-120 parts by weight of organic solvent and stir until homogeneous to obtain an oil phase solution; S3. Mix the aqueous phase solution obtained in step S1 and the oil phase solution obtained in step S2 until homogeneous and emulsify into an emulsion. Purge nitrogen gas into the emulsion and heat to carry out the reaction. After the reaction is completed and cooled, the product is filtered, washed and dried to obtain antibacterial microparticles; S4, the antibacterial microparticles, synthetic resin and functional additives are mixed evenly and heated to a molten state. The melt is spun and stretched to form fiber filaments. Then the fiber filaments are curled, dried and cut to obtain antibacterial fibers composed of several antibacterial microparticles wrapped in fibrous synthetic resin; S5, the antibacterial fibers are opened and combed and then heated to bond the antibacterial fibers. After cooling, an antibacterial nonwoven fabric composed of several antibacterial fibers is formed.

2. The method for producing the antibacterial nonwoven fabric according to claim 1, characterized in that, The acrylate is selected from sodium acrylate and potassium acrylate, and the initiator is selected from sodium persulfate, potassium persulfate, and ammonium persulfate.

3. The method for producing the antibacterial nonwoven fabric according to claim 1, characterized in that, The antimicrobial polypeptide is selected from one or more of the following: cephalosporin, bufotoxin, indigo antimicrobial peptide, defensin, lactoferrin peptide, and bacitracin.

4. The method for producing the antibacterial nonwoven fabric according to claim 1, characterized in that, The surfactant is selected from either polyoxyethylene sorbitan monostearate or polyoxyethylene dehydrated sorbitan monolaurate.

5. The method for producing the antibacterial nonwoven fabric according to claim 1, characterized in that, The emulsifier is selected from one of glyceryl stearate, fatty alcohol polyoxyethylene ether, and alkylbenzene sulfonate, and the organic solvent is selected from one of cyclohexanone, chlorobenzene, and dichlorobenzene.

6. The method for producing the antibacterial nonwoven fabric according to claim 1, characterized in that, In step S3, the aqueous solution and the oil solution are mixed and then emulsified into an emulsion by high-frequency ultrasonic vibration. The frequency of ultrasonic emulsification is 40-60 kHz and the amplitude is 30-60 μm.

7. The method for producing the antibacterial nonwoven fabric according to claim 1, characterized in that, In step S3, the pH of the emulsion needs to be adjusted to 7-8 using a buffer, wherein the buffer is selected from one of sodium bicarbonate buffer, sodium carbonate buffer, sodium dihydrogen phosphate buffer, and disodium hydrogen phosphate buffer.

8. The method for producing the antibacterial nonwoven fabric according to claim 1, characterized in that, In step S3, the emulsion is heated to react at a temperature of 60-70℃ for a reaction time of 3-5 hours.

9. The method for producing the antibacterial nonwoven fabric according to claim 1, characterized in that, The synthetic resin is selected from one of polypropylene resin, polyethylene resin, polyvinyl chloride resin, polyurethane resin, and polyester resin.

10. The method for producing the antibacterial nonwoven fabric according to claim 1, characterized in that, The functional additives include dispersants, antioxidants, and flow aids. The dispersant is selected from one of polyvinylpyrrolidone, polyethylene glycol, silicates, and phosphates. The antioxidant is selected from one of BHT, dilauryl thiodipropionate, DEHA, DPPD, and UV-P. The flow aid is selected from one of zinc stearate, calcium stearate, polydimethylsiloxane, oleamide, or stearamide.

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