Flame-retardant antibacterial polyamide fabric and preparation method thereof

Abstract

The invention discloses a flame-retardant antibacterial polyamide fabric and a preparation method thereof.The flame-retardant antibacterial polyamide fabric comprises a skin-friendly inner-layer fabric and an outer-layer nylon fabric, cool-feeling composite fibers used in the skin-friendly inner-layer fabric enhance the cool-feeling coefficient of the fabric, and the fabric is beneficial to flame retardance; antibacterial fibers containing a composite nano antibacterial agent and a flame retardant B are used in the outer-layer nylon fabric, and the antibacterial property and the flame-retardant effect of the whole fabric are enhanced through the component substances; and finally, an antibacterial gel layer is attached to the surface of the outer nylon fabric layer, so that an antibacterial effect is achieved. The nylon fabric disclosed by the invention has excellent antibacterial property and flame retardant property on the whole, can absorb moisture, is quick to dry, keeps a cool feeling and reduces the possibility of bacterium breeding especially in summer which is easy to sweat, and also has a very good flame retardant effect.

Description

Technical Field

[0001] The present invention relates to the technical field of the preparation of flame-retardant polymer materials, and particularly relates to a flame-retardant and antibacterial polyamide fabric and a preparation method thereof. Background Art

[0002] Clothes are one of the necessities of people's lives. Existing clothes are mainly made by tailoring fabrics. With the development of technology, there are various types of fabrics with more and more functions, evolving from the initial cold protection to multiple functions such as breathability, waterproofness, and antibacterial properties. Fabrics are woven. With the continuous development and improvement of the textile knowledge system and discipline system, especially after the emergence of technologies such as non-woven textile materials and three-dimensional composite weaving, it is no longer just traditional manual spinning and weaving, but also includes non-woven fabric technology, modern three-dimensional weaving technology, modern electrostatic nano-web forming technology, etc. for the production of clothing, industrial, and decorative textiles. Therefore, modern textile refers to a multi-scale structure processing technology of fibers or fiber aggregates.

[0003] In the prior art, the fabric itself is easily torn and damaged, and it is generally used close to the body in people's bedding or clothing fabrics. However, there are generally bacterial impurities in the environment, which are easily attached to the fabric and then affect the human body. Moreover, in the hot summer, the generation and residue of sweat are more likely to cause the growth of bacteria, greatly reducing the wearing comfort. Therefore, people's requirements for the cool feeling of fabrics will also be appropriately increased, and fibers and textiles with cool feeling functions have gradually become a research hotspot in the chemical fiber industry and have developed rapidly.

[0004] In view of this, we disclose a flame-retardant and antibacterial polyamide fabric and a preparation method thereof. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a flame-retardant and antibacterial polyamide fabric and a preparation method thereof. The cool feeling fiber used makes the skin-friendly inner layer fabric have a good contact cool feeling, reducing the generation of sweat. The outer layer nylon (polyamide) fabric has excellent antibacterial properties and flame-retardant effects, effectively reducing the growth of bacteria, and the excellent flame-retardant performance also has a certain protective function.

[0006] To achieve the above object, the present invention proposes the following technical solutions: A flame-retardant and antibacterial polyamide fabric, comprising a skin-friendly inner layer fabric and an outer layer nylon fabric, and the skin-friendly inner layer fabric and the outer layer nylon fabric are fixedly connected through photocatalyst fibers: The skin-friendly inner layer fabric is woven from nylon fibers and cool feeling composite fibers. The cool feeling composite fiber is spun from 50%-60% cool feeling fibers, 20-30% quick-drying nylon fibers, and 10%-30% polylactic acid fibers, with an S twist direction; The cool-sensation fiber is prepared by uniformly mixing 75-85 parts of polyamide masterbatch, 3-5 parts of mica, 3-5 parts of jade powder, 3-5 parts of pearl powder, 3-5 parts of flame retardant A, and 3-5 parts of food-grade xylitol, and then through a spinning process; The outer layer nylon fabric is woven from nylon fiber and antibacterial fiber, the nylon fiber content is 70%, and the antibacterial fiber content is 30%; A layer of antibacterial gel layer is attached to the surface of the outer layer nylon fabric; The antibacterial fiber is made by co-mixing and extrusion, and melt spinning from the following raw materials in percentage content: 100 parts of polyamide masterbatch; 10-15 parts of composite nano-antibacterial agent; 5-11 parts of flame retardant B; 1-5 parts of siloxanized chitosan.

[0007] On the basis of the above solution and as a preferred solution of the above solution, the flame retardant A is a hydrophilic flame retardant copolyester.

[0008] On the basis of the above solution and as a preferred solution of the above solution, the hydrophilic flame retardant copolyester is polymerized by a hydrothermal method after adding terminal hydroxyl siloxane to 2-carboxyethyl phenylphosphinic acid and ethylene glycol under nitrogen protection.

[0009] On the basis of the above solution and as a preferred solution of the above solution, the antibacterial gel layer material is antibacterial xylitol gel.

[0010] On the basis of the above solution and as a preferred solution of the above solution, the composite nano-antibacterial agent is leaf-shaped silver-based bismuth vanadate.

[0011] On the basis of the above solution and as a preferred solution of the above solution, the flame retardant B is a cyanated DOPO-based flame retardant.

[0012] On the basis of the above solution and as a preferred solution of the above solution, the siloxanized chitosan is obtained by impregnating chitosan with a 1.2-1.8 wt% siloxane coupling agent solution and then drying; The siloxane coupling agent is one of KH-550, KH-560, KH-570, and KH-580.

[0013] On the basis of the above solution and as a preferred solution of the above solution, the preparation method of the flame retardant and antibacterial polyamide fabric includes the following steps: S1. Treatment of the skin-friendly inner layer fabric The skin-friendly inner layer fabric is obtained by successively passing through air plasma etching, cool-sensation finishing, and soft setting; S2. Treatment of the outer layer nylon fabric Adopt an impregnation process to make an antibacterial gel layer adhere to the surface of the outer nylon fabric, and then perform shaping and softening treatment to obtain the outer fabric; S3. Quilting and fixing the fabric Quilt the skin-friendly inner fabric and the outer nylon fabric with cool-sensing fibers, and stitch and composite them into a whole to obtain a flame-retardant and antibacterial polyamide fabric.

[0014] Compared with the prior art, the technical solution of the present invention has obtained the following beneficial effects: The present invention discloses a flame-retardant and antibacterial polyamide fabric and a preparation method thereof. The flame-retardant and antibacterial polyamide fabric includes a skin-friendly inner fabric and an outer nylon fabric. The cool-sensing composite fiber used in the skin-friendly inner fabric enhances the cool-sensing coefficient of the fabric and is also beneficial to the flame-retardant performance; the antibacterial fiber containing a composite nano-antibacterial agent and a flame retardant B is used in the outer nylon fabric, and this component enhances the overall antibacterial property and flame-retardant effect of the fabric; finally, the antibacterial gel layer attached to the surface of the outer nylon fabric also has an antibacterial effect. The nylon fabric of the present invention has excellent antibacterial and flame-retardant properties as a whole. Especially in the summer when people are prone to sweating, it can absorb moisture and dry quickly, maintain a cool feeling, reduce the possibility of bacterial growth, and also has a good flame-retardant effect.

[0015] It should be understood that all combinations of the foregoing concepts and additional concepts described in more detail below can be regarded as part of the disclosure of the subject matter of the present invention as long as such concepts do not conflict with each other.

[0016] The foregoing and other aspects, embodiments, and features of the teachings of the present invention can be more fully understood from the following description. Other additional aspects of the present invention, such as the features and / or beneficial effects of exemplary embodiments, will be apparent from the following description or will be learned through the practice of specific embodiments according to the teachings of the present invention. Description of the drawings

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is the process flow chart of the present invention; Figure 2 is the scanning electron microscope image of the composite nano-antibacterial agent of the present invention. Detailed implementation manners

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will, in combination with the embodiments of the present invention, clearly and completely describe the technical solutions of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meaning understood by those of ordinary skill in the art to which the present invention pertains.

[0019] Unless otherwise specified, the test methods or testing methods described in the following examples / comparative examples are all conventional methods; the reagents and materials, unless otherwise specified, are all obtained from conventional commercial channels or prepared by conventional methods.

[0020] In order to better meet consumers' requirements for the wearing comfort, cool feeling, and antibacterial properties of clothing fabrics, the present invention is committed to developing a flame-retardant and antibacterial polyamide fabric and its preparation method to achieve the purposes of being cool and comfortable to wear, reducing the sweating frequency, reducing bacterial growth, and having antibacterial and flame-retardant properties. It should be further noted that the polyamide masterbatch involved in the present invention is purchased from Jiangsu Haiyang Chemical Fiber Co., Ltd., and the polyamide masterbatch is dried in a vacuum oven at 120 °C for 24 h before use.

[0021] Furthermore, the flame retardant A is a hydrophilic flame-retardant copolyester. The hydrophilic flame-retardant copolyester is prepared from terephthalic acid, and then 2-carboxyethylphenylphosphinic acid and ethylene glycol are added in a molar ratio of (1.1 - 1.3):1. After adding terminal hydroxyl silicone under nitrogen protection, it is polymerized by the hydrothermal method.

[0022] First, for raw material premixing, 2-carboxyethylphenylphosphinic acid and ethylene glycol are stirred under nitrogen protection at 95 - 100 °C for 1 - 3 h, then terminal hydroxyl silicone is added dropwise, and the mixture is continuously stirred for 0.5 - 1 h at the same stirring speed in an environment with water as a catalyst to obtain a uniform material. Finally, the uniform material is put into a reaction kettle. Then, according to the ratio, terephthalic acid and the catalyst antimony trioxide are weighed and put into the reaction kettle. After stirring in a nitrogen atmosphere for 0.1 - 0.5 h, the nitrogen source is closed, and the reaction is carried out at 225 - 230 °C and 0.1 - 0.5 MPa for 0.5 - 6 h, and then slowly evacuated for polycondensation reaction. The temperature and pressure reduction process is completed within 30 - 45 min to reach the target conditions: 255 - 275 °C and a vacuum degree lower than 50 Pa. After the reaction ends, nitrogen is introduced, the stirring is stopped, and the product is taken out to obtain the hydrophilic flame-retardant copolyester. The molar ratio of terephthalic acid to ethylene glycol is 1:(1.37 - 1.45).

[0023] Then, 75-85 parts of polyamide masterbatch, 3-5 parts of mica, 3-5 parts of jade powder, 3-5 parts of pearl powder, 3-5 parts of flame retardant A, and 3-5 parts of food-grade xylitol are mixed evenly, and finally cool-sensing fibers are prepared through a spinning process. Preferably, the cross-section of the cool-sensing fiber is W-shaped. The profiled cross-section fiber has certain moisture absorption performance. Coupled with the addition of mineral powders such as mica, jade powder, and pearl powder, the fiber has the effect of contact cold sensation, thereby reducing the possibility of sweating. The addition of food-grade xylitol, in the polyamide masterbatch system, its polyol structure has a similar solubility from the perspective of molecular polarity, which helps the dispersibility of additives, and thus enhances the stability of the system. Moreover, xylitol has been proven to be an effective component in designing multifunctional wound dressing hydrogels, capable of inhibiting the growth of various bacteria and preventing the formation of biofilms. The hydrophilic flame-retardant copolyester not only has the effect of absorbing sweat but also has a flame-retardant function.

[0024] Furthermore, the material of the antibacterial gel layer is antibacterial xylitol gel. Specifically, antibacterial xylitol gel is prepared and an antibacterial gel layer is attached to the surface of the outer nylon fabric through an impregnation process. Specifically, the preparation method of the antibacterial xylitol gel is as follows: First, the outer nylon fabric is placed in a 1.2-1.8 wt% siloxane coupling agent solution for ultrasonic soaking, and then dried by blowing at 60 °C to obtain a pretreated outer nylon fabric; meanwhile, acrylic xylitol monomer is prepared. The acrylic xylitol monomer is formed by the esterification reaction of xylitol and acrylate. Specifically, an aqueous xylitol solution with a mass fraction of 60-67 wt% is added to a round-bottom flask, and then 4-dimethylaminopyridine, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, and acrylate are added in sequence. The molar ratio of 4-dimethylaminopyridine, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, acrylate to xylitol is (1.13-1.52):1:1:1. After all the materials are added completely, the mixture is stirred at a speed of 360-850 rpm at room temperature for 24-36 h, and the final solution is a light yellow transparent liquid. After calculation, the acrylation degree of xylitol is 81-85%; acrylate, acrylamide, acrylic xylitol monomer, N,N'-methylenebisacrylamide, and deionized water are mixed according to a molar ratio of 1:1:1:2:10 to obtain an initial gel liquid. The water content of the initial gel liquid is maintained above 60%, and then a photoinitiator 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone, which is 1 / 10 of the molar amount of the acrylic xylitol monomer, is added to obtain the antibacterial xylitol gel.

[0025] The antibacterial xylitol gel was prepared into a 28-32wt% aqueous solution, and then the pretreated outer nylon fabric was immersed in the solution for 8-12 hours, and then irradiated with ultraviolet light (365 nm, 30 W) for 1-1.5 hours, and then the outer nylon fabric was immersed in deionized water for 12 hours to remove impurities. An antibacterial gel layer was obtained on the outer surface of the outer nylon fabric.

[0026] The outer nylon fabric is ultrasonically treated with a siloxane coupling agent for interfacial adhesion of acrylate groups. Subsequently, xylitol and acrylate react to form acrylic xylitol monomers through esterification. The outer nylon fabric is then immersed in a xylitol hydrogel prepolymer solution, which includes monomers, crosslinkers, photoinitiators, and deionized water. Under ultraviolet irradiation, the unsaturated double bonds between the monomers and the substrate surface form covalent bonds through interfacial initiation polymerization, and then the xylitol hydrogel antibacterial gel layer is formed. Impurities in the hydrogel are easily removed with deionized water. The addition of xylitol itself has certain antibacterial properties, and the formation of the antibacterial gel layer system strengthens the antibacterial properties, thereby enhancing the antibacterial effect of the system.

[0027] Furthermore, the composite nano antibacterial agent is leaf-shaped silver-based bismuth vanadate. The preparation method thereof is as follows: First, referring to the literature of Zhao W. et al., the prepared leaf-shaped BiVO4 was dispersed in deionized water under ultrasonic conditions. After 10 minutes, AgNO3 was added to the dispersion and stirred for 30 minutes in the dark to obtain a dispersion with a molar ratio of leaf-shaped BiVO4 to AgNO3 of 1:1.2. Then, 0.4 times the amount of Na3VO4·12H2O aqueous solution used for leaf-shaped BiVO4 was added dropwise and stirred for 3 hours in the dark. After the reaction was completed, the solution was washed with deionized water and anhydrous ethanol for 3 times respectively, and dried to obtain a composite nano-antibacterial agent with a photocatalytic effect, and its morphology is as follows: Figure 2 As shown, the leaf-shaped BiVO4 has a leaf morphology, and the silver-based substance has a nanorod or granular shape, thereby forming a leaf-shaped composite structure composed of nanoparticles, namely, leaf-shaped silver-based bismuth vanadate.

[0028] The composite nano antibacterial agent relies on silver elements and bismuth vanadate. Under illumination conditions, the leaf-shaped silver-based bismuth vanadate with a heterogeneous structure can effectively separate holes and electrons. The large amount of active oxygen generated at the moment of illumination is enough to kill the two bacteria, and has excellent photocatalytic antibacterial properties. After testing, its antibacterial rate is above 95%; after verification, in the absence of light, the antibacterial property of the composite nano antibacterial agent is tested. The antibacterial rate of Escherichia coli, Staphylococcus aureus, and Candida albicans is above 90%, and the addition of silver alone also has certain antibacterial properties. Therefore, regardless of whether there is light in the surrounding environment, the antibacterial elements provided by the composite nano antibacterial agent are very strong.

[0029] Furthermore, the flame retardant B is a cyanated DOPO-based flame retardant. In the research of flame retardants, the halogen-free and highly efficient 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) has a relatively high research popularity in the application of flame retardants. Its highly active P-H bond can be derived into a variety of highly efficient flame retardants. In order to better adapt to the flame retardancy of nylon fabrics, we synthesized a cyanated DOPO-based flame retardant with better compatibility and high temperature resistance with the matrix particles on this basis. Further, the preparation method of the cyanated DOPO-based flame retardant is as follows: Place p-cyanobenzaldehyde and 2-aminobenzimidazole in absolute ethanol according to a molar ratio of 1:1. After the absolute ethanol submerges the solid raw materials, pre-dissolve them. At this time, the volume is V; then add 9 times the volume of absolute ethanol that submerges the solid raw materials. At this time, the volume of absolute ethanol in the container is 10 times the volume of absolute ethanol that submerges the solid raw materials, that is, 10V. Place the above solution system in a three-necked flask, slowly add 1 / 6V volume of glacial acetic acid, heat the solution to 70-80 °C after adding, and condense and reflux for 18-24 h under magnetic stirring, and then cool naturally. Add deionized water to the three-necked flask, precipitate, filter, and dry at 60-80 °C to obtain a yellow product and weigh the mass. Subsequently, disperse the yellow product in a three-necked flask containing 10V ethanol, and add an ethanol solution (about 20V) of DOPO with the same mass as the yellow product dissolved. Heat the mixed solution to 70-80 °C and condense and reflux for 3-8 h, and white precipitate will precipitate. Filter, wash with alcohol, and vacuum dry at 60 °C for 10-15 h to obtain the cyanated DOPO-based flame retardant, and the yield is 91-93%. Among them, p-cyanobenzaldehyde, 2-aminobenzimidazole, and DOPO are all purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0030] Although DOPO is a preferred substance for flame retardancy, its chemical bond energy is relatively low during heating. Especially, the P-C and P-O bonds are prone to break during heating. The cyanated DOPO-based flame retardant improves the overall stability of the flame retardant due to the introduction of an electron-deficient nitrogen-containing heat-resistant group; and due to the introduction of cyanide groups and imidazole rings, it has a protective effect on the P-C and P-O bonds. Moreover, within the processing temperature range of polyamide, the cyanated DOPO-based flame retardant has good compatibility with the polyamide masterbatch and good dispersibility. When a fire occurs and the temperature is relatively high, the cyanide groups in the cyanated DOPO-based flame retardant will undergo a trimerization reaction, and the formed triazine ring can increase the viscosity of the polymer melt. Adding a flame retardant containing cyanide groups can endow the matrix with good anti-dripping performance; in addition, during the combustion process, the formed triazine ring will decompose and release incombustible gases such as ammonia, thereby reducing the concentration of combustible gases and enhancing the gas-phase flame retardant effect.

[0031] Furthermore, the antibacterial fiber is obtained by co-blending extrusion and melt spinning from the following raw materials with the following percentage contents: 100 parts of polyamide masterbatch; 10 - 15 parts of composite nano antibacterial agent; 5 - 11 parts of flame retardant B; 1 - 5 parts of siloxanized chitosan.

[0032] Specifically, the polyamide masterbatch, composite nano antibacterial agent, flame retardant B, and siloxanized chitosan are placed in a high - speed blender and mixed evenly. The mixed material is then subjected to co - blending extrusion and granulation using a micro twin - screw extruder at 240 °C and 100 rpm, and this process is repeated three times. The temperatures of the first zone, second zone, third zone, and fourth zone are 210 °C, 215 °C, 225 °C, and 230 °C respectively. Then antibacterial fibers are obtained by melt spinning, and the spinning speed during the melt spinning process is 850 - 950 m / min. Performance testing

[0033] Antibacterial performance testing Refer to FZ / T 73023 - 2006 "Antibacterial Knitted Fabrics" to test the antibacterial property, prepare standard test samples of the samples, and measure the antibacterial rate (%).

[0034] Cool feeling coefficient testing

[0035] According to the method of "FZ / T 62042 - 2020 Cool - feeling Fabrics for Bedding", conduct the contact drying coefficient test of the fabric, with the unit of J / cm 2 –s; and after 10 complete washing cycles using simplified washing conditions and procedures, the contact cool feeling coefficient of the fabric.

[0036] Flame retardant performance testing

[0037] Refer to GB / T5455 - 2014 "Determination of the Vertical - Direction Damage Length, After - glow and Continuing - Burn Time of the Combustion Performance of Textiles" to evaluate the flame retardant performance of the flame retardant and antibacterial polyamide fabric by the continuing - burn time, after - glow time, and damage length. All the obtained indexes are the averages of 3 sub - samples. Example 1

[0038] A flame retardant and antibacterial polyamide fabric, including a skin - friendly inner layer fabric and an outer layer nylon fabric, and the skin - friendly inner layer fabric and the outer layer nylon fabric are connected and fixed by photocatalyst fibers: The skin - friendly inner layer fabric is woven from nylon fibers and cool - feeling composite fibers, and the cool - feeling composite fibers are spun from 55% cool - feeling fibers, 25% quick - drying nylon fibers, and 20% polylactic acid fibers, with an S - twist direction; The cool - feeling fibers are prepared by uniformly mixing 80 parts of polyamide masterbatch, 4 parts of mica, 4 parts of jade powder, 4 parts of pearl powder, 4 parts of flame retardant A, and 4 parts of food - grade xylitol, and then through a spinning process; The outer nylon fabric is woven from nylon fibers and antibacterial fibers. The nylon fiber content is 70%, and the antibacterial fiber content is 30%. A layer of antibacterial gel layer is attached to the surface of the outer nylon fabric. The antibacterial fiber is made by co - extrusion and melt - spinning from the following raw materials with the following percentage contents: Polyamide masterbatch: 100 parts; Composite nano - antibacterial agent: 13 parts; Flame retardant B: 8 parts; Siloxanized chitosan: 3 parts.

[0039] Further, the flame retardant A is a hydrophilic flame - retardant copolyester. Specifically, the hydrophilic flame - retardant copolyester is polymerized by hydrothermal method after adding terminal - hydroxyl siloxane to 2 - carboxyethyl phenylphosphinic acid and ethylene glycol under nitrogen protection.

[0040] Further, the antibacterial gel layer is made of antibacterial xylitol gel.

[0041] Further, the composite nano - antibacterial agent is leaf - shaped silver - based bismuth vanadate.

[0042] Further, the flame retardant B is a cyanated DOPO - based flame retardant.

[0043] Further, the siloxanized chitosan is obtained by impregnating chitosan with a 1.5wt% siloxane coupling agent solution and then drying. Preferably, the siloxane coupling agent is KH - 560.

[0044] Further, the preparation method of the flame - retardant and antibacterial polyamide fabric includes the following steps: S1. Treatment of the skin - friendly inner - layer fabric Sequentially through air plasma etching, cool - feeling finishing, and softening and shaping For air plasma etching, the skin - friendly inner - layer fabric is etched with air plasma. The etching output power is 150 - 300W, and the treatment time is 1 - 3min. After selecting the cool - feeling agent, the cool - feeling agent is attached to the skin - friendly inner - layer fabric by padding method. In the present invention, the skin - friendly inner - layer fabric is preferably treated by double - dipping and double - rolling with the cool - feeling finishing agent KND - LG30. The parameters of the double - dipping and double - rolling treatment process are as follows: Bath ratio: 1:15 - 1:30; pH value of the bath solution: 5.5 - 6.5; Treatment temperature: 30 - 40°C; The bath solution includes 20 - 50g / L of cool - feeling finishing agent, 10 - 0g / L of cross - linking agent citric acid, and 5 - 10g / L of penetrant T; The pickup rate is 65%-80%, the pre-drying temperature is 80-90°C, the pre-drying time is 3-5 min, the drying temperature is 105-115°C, and the drying time is 2-3 min.

[0045] Finally, a skin-friendly inner layer fabric is obtained through final shaping and softening treatment; S2. Treatment of the outer layer nylon fabric Using the dipping process, an antibacterial gel layer is attached to the surface of the outer layer nylon fabric, and then shaping and softening treatment is carried out to obtain the outer layer fabric; S3. Quilting and fixing of the fabric The skin-friendly inner layer fabric and the outer layer nylon fabric are quilted with cool-sensing fibers and stitched and compounded into a whole to obtain a flame-retardant and antibacterial polyamide fabric. Example 2

[0046] Different from the above Example 1, a flame-retardant and antibacterial polyamide fabric includes a skin-friendly inner layer fabric and an outer layer nylon fabric, and the skin-friendly inner layer fabric and the outer layer nylon fabric are connected and fixed by photocatalyst fibers: The skin-friendly inner layer fabric is woven from nylon fibers and cool-sensing composite fibers. The cool-sensing composite fibers are spun from 50% cool-sensing fibers, 20% quick-drying nylon fibers, and 30% polylactic acid fibers, with an S twist direction; The cool-sensing fibers are prepared by uniformly mixing 75 parts of polyamide masterbatch, 5 parts of mica, 5 parts of jade powder, 5 parts of pearl powder, 5 parts of flame retardant A, and 5 parts of food-grade xylitol, and then through a spinning process; The outer layer nylon fabric is woven from nylon fibers and antibacterial fibers. The nylon fiber content is 70%, and the antibacterial fiber content is 30%; An antibacterial gel layer is attached to the surface of the outer layer nylon fabric; the antibacterial fibers are formed by co-mixing extrusion and melt spinning from the following raw materials with the following percentage contents: 100 parts of polyamide masterbatch; 10 parts of composite nano-antibacterial agent; 5 parts of flame retardant B; 1 part of siloxanized chitosan.

[0047] Other process steps refer to Example 1. Example 3

[0048] A flame-retardant and antibacterial polyamide fabric includes a skin-friendly inner layer fabric and an outer layer nylon fabric, and the skin-friendly inner layer fabric and the outer layer nylon fabric are connected and fixed by photocatalyst fibers: The skin-friendly inner layer fabric is woven from nylon fibers and cool-sensing composite fibers. The cool-sensing composite fibers are spun from 60% cool-sensing fibers, 30% quick-drying nylon fibers, and 10% polylactic acid fibers, with an S twist direction; The cool-sensation fiber is prepared by uniformly mixing 85 parts of polyamide masterbatch, 3 parts of mica, 3 parts of jade powder, 3 parts of pearl powder, 3 parts of flame retardant A, and 3 parts of food-grade xylitol, and then through a spinning process; The outer layer of nylon fabric is woven from nylon fiber and antibacterial fiber. The content of nylon fiber is 70%, and the content of antibacterial fiber is 30%; A layer of antibacterial gel layer is attached to the surface of the outer layer of nylon fabric; The antibacterial fiber is made by co-mixing and melt-spinning the following raw materials with the following percentage contents: 100 parts of polyamide masterbatch; 15 parts of composite nano antibacterial agent; 11 parts of flame retardant B; 5 parts of siloxanized chitosan.

[0049] For other process steps, refer to Example 1. Comparative Example 1

[0050] Different from Example 1, the skin-friendly inner layer fabric is woven from nylon fiber and cool-sensation composite fiber. The cool-sensation composite fiber is blended from 55% cool-sensation fiber, 25% quick-drying nylon fiber, and 20% polylactic acid fiber, with S twist direction; The cool-sensation fiber is prepared by uniformly mixing 80 parts of polyamide masterbatch, 4 parts of mica, 4 parts of jade powder, 4 parts of pearl powder, 4 parts of flame retardant A, and 4 parts of food-grade xylitol, and then through a spinning process; For other process steps, refer to Example 1. Comparative Example 2

[0051] Different from Example 1, the skin-friendly inner layer fabric is woven from nylon fiber. For other process steps, refer to Example 1. Comparative Example 3

[0052] Different from Example 1, the outer layer of nylon fabric is woven from nylon fiber and antibacterial fiber. The content of nylon fiber is 70%, and the content of antibacterial fiber is 30%; A layer of antibacterial gel layer is attached to the surface of the outer layer of nylon fabric; The antibacterial fiber is made by co-mixing and melt-spinning the following raw materials with the following percentage contents: 100 parts of polyamide masterbatch; 8 parts of flame retardant B; 3 parts of siloxanized chitosan.

[0053] For other process steps, refer to Example 1. Comparative Example 4

[0054] Different from Example 1, the outer nylon fabric is woven from nylon fibers and antibacterial fibers, with the nylon fiber content being 70% and the antibacterial fiber content being 30%. A layer of antibacterial gel layer is attached to the surface of the outer nylon fabric; the antibacterial fiber is made by co - extruding and melt - spinning the following raw materials with the following percentage contents: Polyamide masterbatch: 100 parts; Composite nano - antibacterial agent: 13 parts; Siloxanized chitosan: 3 parts.

[0055] For other process steps, refer to Example 1. Comparative Example 5

[0056] Different from Example 1, the outer nylon fabric is woven from nylon fibers. A layer of antibacterial gel layer is attached to the surface of the outer nylon fabric.

[0057] For other process steps, refer to Example 1. Comparative Example 6

[0058] Different from Example 1, the outer nylon fabric is woven from nylon fibers and antibacterial fibers, with the nylon fiber content being 70% and the antibacterial fiber content being 30%. After the outer nylon fabric is treated with deionized water to remove impurities, it is directly dried to obtain the outer nylon fabric. For other process steps, refer to Example 1. Comparative Example 7

[0059] Different from Example 1, the fabric prepared in Example 1 is placed in the dark, and then relevant antibacterial property tests are carried out to obtain the antibacterial rate.

[0060] According to the relevant preparation methods and sample preparation methods, the samples of Examples 1 - 3 and Comparative Examples 1 - 7 are subjected to performance tests. The relevant test comparisons are shown in Table 1 in detail.

[0061] Table 1 Analysis Table of Test Results

[0062] It can be analyzed from the comparison results in Table 1 above that: In Comparative Example 1, since flame retardant A was missing in the cool feeling fiber component of the cool feeling composite fiber, the cool feeling coefficient decreased slightly because the hydrophilic substance affected the absorption of sweat, which in turn affected the decrease of the cool feeling coefficient. Particularly obvious is that the flame retardant performance of this fabric decreased. Moreover, without the hydrophilic flame retardant copolyester of flame retardant A, when the cool feeling fiber was prepared by melt extrusion granulation, there were obvious agglomerated substances in the particles, which affected the dispersion stability of the added substances. In Comparative Example 2, the lack of cool feeling fiber greatly affected the cool feeling effect of the fabric, and the instability after washing was also relatively strong.

[0063] Comparative Example 3 shows that the composite nano-antibacterial agent has a greater impact on antibacterial properties. Compared with Comparative Example 6, the antibacterial gel layer also has an impact on the overall antibacterial property, but the impact is not as large as that of the composite nano-antibacterial agent. The antibacterial data of Comparative Example 7 shows that whether there is light or not, this fabric still has excellent antibacterial effects.

[0064] Regarding the flame retardant performance, the antibacterial gel layer contains substances such as xylitol, which is slightly helpful for the flame retardant performance, but the impact is far less than that of flame retardant A and flame retardant B. Although the leaf-shaped composite nano-antibacterial agent contains metal oxide flame retardant elements, it also has an impact on the flame retardancy, but the effect is not significant. Generally speaking, the elements affecting the flame retardant performance are arranged in descending order as follows: flame retardant B > flame retardant A > antibacterial gel layer > composite nano-antibacterial agent.

[0065] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope defined in the claims.

Claims

1. A flame retardant and antibacterial polyamide fabric, characterized in that: It comprises a skin-friendly inner layer fabric and an outer layer nylon fabric, wherein the skin-friendly inner layer fabric and the outer layer nylon fabric are connected and fixed by photocatalyst fibers: The skin-friendly inner layer fabric is woven from nylon fibers and cool composite fibers, wherein the cool composite fibers are blended from 50% to 60% cool fibers, 20% to 30% quick-drying nylon fibers, and 10% to 30% polylactic acid fibers, and have an S twist direction; The cooling fiber is prepared by uniformly mixing 75-85 parts of polyamide masterbatch, 3-5 parts of mica, 3-5 parts of jade powder, 3-5 parts of pearl powder, 3-5 parts of flame retardant A, and 3-5 parts of food-grade xylitol, and then spinning; The outer nylon fabric is woven from nylon fiber and antibacterial fiber, the nylon fiber content is 70%, and the antibacterial fiber content is 30%; An antibacterial gel layer is attached to the surface of the outer nylon fabric.

2. The flame retardant and antibacterial polyamide fabric according to claim 1, characterized in that: The antibacterial fiber is made by blending, extruding and melt spinning raw materials with the following percentages: Polyamide masterbatch 100 parts; 10-15 parts of composite nano antibacterial agent; Flame retardant B 5-11 parts; 1-5 parts of siloxane chitosan.

3. The flame retardant and antibacterial polyamide fabric according to claim 2, characterized in that: The flame retardant A is a hydrophilic flame retardant copolyester.

4. The flame retardant and antibacterial polyamide fabric according to claim 3, characterized in that: The hydrophilic flame-retardant copolyester is prepared by hydrothermal polymerization of 2-carboxyethylphenyl hypophosphorous acid and ethylene glycol, after adding terminal hydroxyl siloxane under nitrogen protection conditions.

5. The flame retardant and antibacterial polyamide fabric according to claim 2, characterized in that: The antibacterial gel layer is made of antibacterial xylitol gel.

6. The flame retardant and antibacterial polyamide fabric according to claim 2, characterized in that: The composite nano antibacterial agent is leaf-shaped silver-based bismuth vanadate.

7. The flame retardant and antibacterial polyamide fabric according to claim 2, characterized in that: The flame retardant B is a cyanide DOPO-based flame retardant.

8. The flame retardant and antibacterial polyamide fabric according to claim 2, characterized in that: The siloxane-modified chitosan is obtained by impregnating chitosan with a 1.2-1.8 wt % siloxane coupling agent solution and then drying the chitosan; the siloxane coupling agent is one of KH-550, KH-560, KH-570 and KH-580.

9. A method for preparing the flame retardant and antibacterial polyamide fabric according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, Skin-friendly inner fabric treatment The skin-friendly inner layer fabric is obtained through air plasma etching, cool finishing and soft shaping. S2, outer nylon fabric treatment The outer nylon fabric is impregnated with an antibacterial gel layer, and then the outer fabric is shaped and softened to obtain the outer fabric. S3, fabric quilting fixation The skin-friendly inner layer fabric and the outer layer nylon fabric are quilted with cool fibers, and the quilted layers are stitched and compounded into a whole to obtain a flame-retardant and antibacterial polyamide fabric.

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