Plasma treatment process and system for antibacterial and mildew-proof composite fabric

Abstract

The invention relates to the technical field of fabric processing, in particular to a plasma treatment process and system for an antibacterial and mildew-proof composite fabric, and the plasma treatment process comprises the following steps: S1, base cloth pretreatment: dipping a polyester and cotton blended fabric in an alkaline cleaning solution, and carrying out ultrasonic treatment for 10-15 minutes; s2, plasma activation: introducing argon into the vacuum reaction cavity, and applying a pulse power supply for treatment for 3-8 minutes; s3, composite liquid spraying: spraying the chitosan-tea tree oil composite liquid to the activated base cloth through a high-pressure spray gun, wherein the spraying amount is 15-25 g / m; and S4, gradient curing is conducted, specifically, pre-curing is conducted for 2-4 min at the temperature of 60-70 DEG C, and then shaping is conducted for 30-60 s through a hot pressing roller at the temperature of 120-140 DEG C and the pressure of 5-8 MPa. The antibacterial and mildew-proof performance of the compound fabric is improved, the binding force of the compound liquid and the fabric is enhanced, and the fabric has better durability and stability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fabric processing, in particular to a plasma treatment process and system for antibacterial and mildew-proof composite fabric. BACKGROUND

[0002] Fabrics are widely used in various fields of daily life, such as clothing, home textiles, medical supplies, etc. However, there are many problems in the existing fabrics that need to be solved in terms of antibacterial and mildew-proof. Traditional fabrics are mostly made of natural fibers or chemical fibers, which provide an ideal environment for the growth of microorganisms. Bacteria, mold and other microorganisms can easily grow and reproduce on the surface of fabrics under suitable temperature and humidity conditions. In the clothing field, people will sweat in daily activities, and the organic matter in sweat becomes the nutrient source for microorganisms, causing clothes to produce odor, and the growth of bacteria may also cause skin diseases and harm human health. In home textile products such as bed sheets and covers, mold can easily grow after long-term use, affecting the appearance and possibly causing respiratory allergies.

[0003] Currently, although some fabrics have adopted antibacterial and mildew-proof treatment technology, the effect is not ideal. Some treatment methods only simply add antibacterial agents to the surface of the fabric, and with the increase of washing times, the antibacterial agents are easily lost, and the antibacterial and mildew-proof performance decreases rapidly. Moreover, the existing types of antibacterial agents are limited, and the inhibition effect on some stubborn bacteria and mold is weak, which cannot meet the requirements of people for the hygiene performance of fabrics.

[0004] The existing fabric antibacterial and mildew-proof treatment process is often complex and costly, which limits its large-scale application. Moreover, some treatment processes may have a negative impact on the original performance of the fabric, such as reducing the durability and stability of the fabric. SUMMARY

[0005] To solve the above problems, the present application improves the antibacterial and mildew-proof performance of the composite fabric, enhances the bonding force between the composite liquid and the fabric, and provides the fabric with a double-layer spinning structure and spinning process that has better durability and stability.

[0006] The technical solution adopted by the present application is: a plasma treatment process for antibacterial and mildew-proof composite fabric, comprising the following steps: Step S1, base fabric pretreatment: dip the polyester and cotton blended fabric in an alkaline cleaning solution and ultrasonically treat for 10-15 min; Step S2, plasma activation: introduce argon gas into the vacuum reaction chamber and apply a pulse power for 3-8 min; In the treatment, the plasma parameters include: vacuum degree: 10-20 Pa; argon gas flow rate: 30-50 mL / min; electrode spacing: 50-80 mm; Step S3, composite liquid spraying: spray the chitosan- tea tree oil composite liquid to the activated base cloth through a high-pressure spray gun, and the spraying amount is 15-25 g / m²; Step S4, gradient curing: first pre-curing at 60-70°C for 2-4 min, and then curing through a heat press roller at a temperature of 120-140°C, a pressure of 5-8 MPa, and a setting time of 30-60 s.

[0007] Further improvement of the above scheme is that the formula of the chitosan- tea tree oil composite liquid is: deacetylated chitosan: 1.5-2.5%; tea tree essential oil: 3-5%; nano zinc oxide: 0.8-1.5%; citric acid crosslinking agent: 0.5-1%; and the rest is deionized water, Further improvement of the above scheme is that polyhexamethylene biguanide is added to the chitosan- tea tree oil composite liquid, and the addition amount is: 0.3-0.8%; and after heat pressing, a 30 g / L fluorine-based waterproof agent is immersed and padded.

[0008] Further improvement of the above scheme is that the nano zinc oxide is surface modified: treated with silane coupling agent KH-550, and the addition amount is: 1-2 wt%; after modification, the Zeta potential is ≥+35 mV, and the pH is 6.5.

[0009] Further improvement of the above scheme is that in step S1, the pH of the alkaline cleaning liquid is 10-12; and in step S2, argon gas with a purity of ≥99.99% is introduced into the vacuum reaction chamber, and the power of the pulse power source is: 300-500 W, and the frequency is: 20-40 kHz.

[0010] Further improvement of the above scheme is that the outer surface of the heat press roller in step S4 is provided with a micro-pit array, the pits in the micro-pit array have a diameter of 100-200 μm and a depth of 50-100 μm; and the pit density is: 200-300 pieces / cm².

[0011] Further improvement of the above scheme is that the viscosity control method of the chitosan- tea tree oil composite liquid is: adding sodium carboxymethyl cellulose to adjust the viscosity to 450~650 mPa·s; the viscosity detection uses a rotary viscometer; when the viscosity is greater than 650 mPa·s, deionized water is added, and when the viscosity is less than 450 mPa·s, 0.5% carboxymethyl cellulose solution is added.

[0012] The application discloses a kind of plasma processing system, for implementing the plasma processing process of the antibacterial mildew-proof composite fabric, including being sequentially arranged along production line: base cloth unwinding mechanism, plasma processing cabin, composite liquid spray cabin, gradient solidification mechanism and finished product winding mechanism;The base cloth unwinding mechanism is used for polyester and cotton blended fabric to be immersed in alkaline cleaning solution, and is unwound towards plasma processing cabin by unwinding roller;Rotary electrode group and argon supply module are arranged in the plasma processing cabin, and the vacuum degree in the plasma processing cabin is maintained 10-50Pa;The composite liquid spray cabin is provided with high-pressure spray gun array, and the high-pressure spray gun array is used for high-pressure spraying chitosan- tea tree oil composite liquid, and the gradient solidification mechanism includes infrared pre-drying oven and hot roller group, to solidify chitosan- tea tree oil composite liquid;The finished product winding mechanism is used for the base cloth after solidification to be wound.

[0013] Further improvement of the above scheme is that the cabin body of the plasma processing cabin is double-layer water-cooled stainless steel structure, and the inner lining is ceramic insulation layer;The rotary electrode group includes multiple pairs of rod-shaped electrodes, and the argon supply module includes a mass flow meter.

[0014] Further improvement of the above scheme is that the rod-shaped electrode is driven to rotate by servo motor;The surface of the rod-shaped electrode is plated with yttrium stabilized zirconium oxide coating.

[0015] Further improvement of the above scheme is that the high-pressure spray gun array is arranged in a herringbone shape, and the spray distance is 150-250mm.

[0016] Further improvement of the above scheme is that the roller surface of the hot roller group is engraved with micro-pit array by laser, and the surface is plated with diamond-like carbon film.

[0017] The application has the following beneficial effects: Compared with the existing fabric, in the pretreatment stage of the base fabric, the polyester and cotton blended fabric is immersed in an alkaline cleaning solution and subjected to ultrasonic treatment. The alkaline cleaning solution can effectively remove oil stains, impurities and natural wax on the surface of the fabric, and the ultrasonic treatment further enhances the cleaning effect, making the fabric surface cleaner, creating good conditions for subsequent plasma activation and composite liquid attachment. In the plasma activation process, argon gas is introduced into the vacuum reaction chamber and pulsed power is applied. Suitable vacuum degree, argon flow rate and electrode spacing and other parameters make the argon plasma uniformly act on the surface of the fabric. High-energy particles in the plasma collide with the surface of the fabric, causing the molecular chains on the surface of the fabric to break, generating a large number of active groups, thereby increasing the roughness and chemical activity of the surface of the fabric and enhancing the binding force between the subsequent composite liquid and the fabric. In the composite liquid spraying step, the chitosan- tea tree oil composite liquid is uniformly sprayed on the activated base fabric. Chitosan has good antibacterial performance, and tea tree oil has natural mildew and antibacterial efficacy, and the combination of the two forms a composite liquid that gives the fabric excellent antibacterial and mildew-resistant performance. The appropriate spraying amount ensures that the composite liquid can fully cover the surface of the fabric without causing waste. In the gradient curing stage, low-temperature pre-curing is carried out first to preliminarily fix the composite liquid on the surface of the fabric to prevent the composite liquid from flowing during the subsequent hot pressing process. Then, high-temperature hot pressing is carried out to further enhance the binding strength between the composite liquid and the fabric, making the antibacterial and mildew-resistant performance of the fabric more durable and stable. The present application improves the antibacterial and mildew-resistant performance of the composite fabric, enhances the binding force between the composite liquid and the fabric, and makes the fabric have better durability and stability.

[0018] The plasma treatment system is used to implement the plasma treatment process of the antibacterial and mildew-proof composite fabric. The base fabric unwinding mechanism can not only pre-treat the polyester and cotton blended fabric by impregnating it with alkaline cleaning solution to remove impurities and oil stains on the fabric surface, but also transport the pre-treated base fabric in an orderly manner to the plasma treatment chamber through the unwinding roller, thereby ensuring the continuity and stability of the production line. The rotating electrode group and argon supply module in the plasma treatment chamber are key parts. The rotating electrode group can make the plasma act more evenly on the surface of the base fabric, while the argon supply module provides a suitable treatment atmosphere. Maintaining the vacuum degree in the chamber at 10-50Pa, combined with the effect of argon plasma, can produce more active groups on the surface of the base fabric, increase the surface roughness and chemical activity, enhance the bonding force between the subsequent composite liquid and the base fabric, thereby effectively improving the antibacterial and mildew-proof performance and overall quality of the fabric. The high-pressure spray gun array in the composite liquid spraying chamber can spray the chitosan-tea tree oil composite liquid evenly and at high pressure on the activated base fabric. Uniform spraying ensures coverage of the composite liquid on the surface of the base fabric, fully leveraging the antibacterial and mildew-proofing properties of chitosan and tea tree oil, giving the fabric excellent antibacterial and mildew-proof capabilities. The gradient curing mechanism has clear divisions of labor between the infrared pre-drying oven and the hot pressing roller group. The infrared pre-drying oven can initially cure the composite liquid at a lower temperature, preventing the composite liquid from flowing during the subsequent hot pressing process. The hot pressing roller group further cures the composite liquid under high temperature and high pressure, tightly bonding the composite liquid to the base fabric, improving the durability and stability of the fabric and ensuring long-lasting and effective antibacterial and mildew-proofing properties. The finished product winding mechanism winds up the cured base fabric for subsequent storage, transportation, and processing. The entire system realizes the automation and continuous production of the plasma treatment process for antibacterial and mildew-proof composite fabrics, improving production efficiency and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the process of plasma treatment of antibacterial and mildew-proof composite fabrics of the present invention; Figure 2 Schematic diagram of the structure of the plasma processing system of the present invention; Figure 3 for Figure 2 Schematic diagram of the structure of the high-pressure spray gun array of the medium plasma processing system; Figure 4 for Figure 2 Schematic diagram of the structure of the hot pressing roller group in the plasma treatment system.

[0020] Explanation of the accompanying symbols: base fabric unwinding mechanism 1, plasma treatment chamber 2, rotating electrode group 21, rod-shaped electrode 211, argon gas supply module 22, composite liquid spraying chamber 3, high-pressure spray gun array 31, gradient curing mechanism 4, infrared pre-oven 41, hot pressing roller group 42, micro-pit array 421, finished product winding mechanism 5. DETAILED DESCRIPTION

[0021] For the purposes of the present application, reference will be made to the accompanying drawings in which preferred embodiments of the application are presented. The drawings are presented for the purpose of illustrating the preferred embodiments of the application. However, the application can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the application to those skilled in the art.

[0022] It is noted that when a component is referred to as being "on" another component, it can be directly on the other component or intervening components can also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components can also be present.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. All publications, patent applications, patents, and other references mentioned herein are incorporated by reference in their entirety for the purpose of describing and disclosing Figure 1 As shown, in one embodiment of the present application, a plasma treatment process for anti-bacterial and mildew resistant composite fabric is provided, comprising the steps of: Step S1, base fabric pretreatment: dip the polyester and cotton blended fabric in an alkaline cleaning solution and perform ultrasonic treatment for 10-15 min; Step S2, plasma activation: introduce argon into a vacuum reaction chamber and apply pulse power treatment for 3-8 min; during the treatment, the plasma parameters include a vacuum degree of 10-20 Pa, an argon flow rate of 30-50 mL / min, and an electrode spacing of 50-80 mm; Step S3, composite liquid spraying: spray the chitosan- tea tree oil composite liquid onto the activated base fabric through a high-pressure spray gun at a spraying amount of 15-25 g / m2; Step S4, gradient curing: first, pre-cure at 60-70°C for 2-4 min, and then perform heat pressing at a temperature of 120-140°C, a pressure of 5-8 MPa, and a setting time of 30-60 s. In the base fabric pretreatment stage of this embodiment, the polyester and cotton blended fabric is dipped in an alkaline cleaning solution and subjected to ultrasonic treatment. The alkaline cleaning solution can effectively remove oil stains, impurities, and natural waxes on the fabric surface, and the ultrasonic treatment further enhances the cleaning effect, making the fabric surface cleaner and creating good conditions for subsequent plasma activation and composite liquid adhesion. During the plasma activation process, argon is introduced into the vacuum reaction chamber and pulse power treatment is applied. Suitable parameters such as vacuum degree, argon flow rate, and electrode spacing enable the argon plasma to uniformly act on the fabric surface. High-energy particles in the plasma collide with the fabric surface, causing the molecular chains on the fabric surface to break, generating a large number of active groups, thereby increasing the roughness and chemical activity of the fabric surface and enhancing the bonding force between the subsequent composite liquid and the fabric. In the composite liquid spraying step, the chitosan- tea tree oil composite liquid is uniformly sprayed onto the activated base fabric. Chitosan has good antibacterial properties, and tea tree oil has natural mildew and antibacterial effects, so the combination of the two forms a composite liquid that gives the fabric excellent antibacterial and mildew-resistant properties. A suitable spraying amount ensures that the composite liquid can fully cover the fabric surface without causing waste. In the gradient curing stage, first, low-temperature pre-curing is performed to preliminarily fix the composite liquid on the fabric surface to prevent the composite liquid from flowing during the subsequent heat pressing process. Then, high-temperature heat pressing is performed to further enhance the bonding strength between the composite liquid and the fabric, making the antibacterial and mildew-resistant properties of the fabric more durable and stable. The present application improves the antibacterial and mildew-resistant properties of the composite fabric, enhances the bonding force between the composite liquid and the fabric, and makes the fabric more durable and stable, which has broad application prospects in the medical, home, and other fields.

[0024] The formula of the chitosan- tea tree oil composite liquid is: deacetylated chitosan: 1.5-2.5%; tea tree oil: 3-5%; nano zinc oxide: 0.8-1.5%; citric acid crosslinking agent: 0.5-1%; and the rest is deionized water. In this embodiment, from the perspective of antibacterial, deacetylated chitosan itself has good antibacterial performance, which can combine with anions on the bacterial cell membrane, change the permeability of the cell membrane, and thus inhibit the growth and reproduction of bacteria. Tea tree oil contains a variety of natural antibacterial ingredients such as terpinen-4-ol, etc., which has strong antibacterial, antiviral and antifungal ability, and can inhibit a variety of common bacteria and fungi. Nano zinc oxide also has excellent antibacterial performance, its small size effect makes it easier to contact with microorganisms, destroy the cell membrane and DNA of microorganisms, further enhance the antibacterial effect of the composite liquid. The synergistic effect of the three makes the treated fabric have high efficient and broad-spectrum antibacterial ability, which can effectively resist the invasion of common bacteria and fungi, and has important application value in medical, home and other fields with high hygiene requirements. In terms of mildew prevention, the natural mildew-proof properties of tea tree oil and chitosan and nano zinc oxide work together to inhibit the growth of mold and the germination of spores, prevent the fabric from mildewing, discoloring and having odor due to the growth of mold, and prolong the service life of the fabric. The addition of citric acid crosslinking agent helps to improve the bonding force of the composite liquid and the fabric. It can crosslink with deacetylated chitosan to form a stable network structure, so that the composite liquid can be more firmly attached to the surface of the fabric, and the durability and stability of the antibacterial and mildew-proof performance of the fabric are enhanced. Deionized water as a solvent provides a good dispersion medium for other ingredients, ensuring uniform mixing of all ingredients and ensuring the quality and performance stability of the composite liquid.

[0025] The polyhexamethylene biguanide is added in the chitosan- tea tree oil composite liquid, and the adding amount is: 0.3-0.8%; after hot pressing, a fluorine-based waterproof agent with a dipping concentration of 30g / L is impregnated. In this embodiment, from the antibacterial performance, polyhexamethylene biguanide is a highly effective broad-spectrum bactericide, which has strong killing and inhibiting effect on bacteria, fungi and viruses, etc. Adding it to the chitosan- tea tree oil composite liquid, it cooperates with deacetylated chitosan, tea tree oil and nano zinc oxide to form a multi-dimensional antibacterial system. Polyhexamethylene biguanide can destroy the cell membrane structure of microorganisms, make its contents leak, and thus achieve the purpose of sterilization. Further enhance the antibacterial ability of the composite fabric, so that the fabric can still maintain good antibacterial effect when facing more kinds and higher concentration of microorganisms, effectively reduce the odor and fabric damage caused by bacterial growth, especially suitable for medical, health and other scenes with extremely high health standards. In terms of waterproof performance, the fluorine-based waterproof agent with a dipping concentration of 30g / L plays a key role after hot pressing. Fluorine-based waterproof agent can form a uniform and dense waterproof film on the surface of the fabric. This film has very low surface energy, making it difficult for water to spread and penetrate on the surface of the fabric. When the fabric encounters water, water droplets will roll on the surface without penetrating, greatly improving the waterproof performance of the fabric. The fabric can remain dry in a humid environment, not only increasing the practicality of the fabric, but also further inhibiting the growth of mold, because the growth of mold usually requires a humid environment.

[0026] Nanometer zinc oxide surface modification: silane coupling agent KH-550 treatment, the amount of addition is: 1-2wt%; after modification, Zeta potential is ≥+35mV, pH=6.5. In this embodiment, from the aspect of dispersibility, the amount of addition of silane coupling agent KH-550 is 1-2wt%, which can form an organic coating layer on the surface of nanometer zinc oxide. This coating layer can effectively reduce the agglomeration phenomenon between nanometer zinc oxide particles, and improve the uniformity of dispersion of nanometer zinc oxide in the chitosan- tea tree oil composite liquid. When nanometer zinc oxide can be uniformly dispersed, it can more fully synergize with other antibacterial and mildew-proof ingredients, so that the antibacterial and mildew-proof performance of the composite liquid is more stable and durable. In terms of the binding force with the fabric, silane coupling agent has a unique molecular structure, one end of which can chemically react with the hydroxyl group on the surface of nanometer zinc oxide, and the other end can combine with the group on the surface of the fabric. Therefore, the modified nanometer zinc oxide can be better attached to the fabric, and even after the fabric is washed and used for many times, the nanometer zinc oxide is not easy to fall off, thereby ensuring the long-acting property of the antibacterial and mildew-proof performance of the fabric. The conditions of Zeta potential ≥+35mV and pH=6.5 are conducive to maintaining the stability of nanometer zinc oxide in the composite liquid. Higher positive Zeta potential indicates that the particle surface has more positive charges, and the electrostatic repulsion between particles is enhanced, which further prevents the agglomeration of particles. And the suitable pH value environment can make the hydrolysis and condensation reaction of silane coupling agent in the best state, so as to ensure that the modification effect of nanometer zinc oxide reaches the optimum. Nanometer zinc oxide itself has antibacterial performance, and after modification, its antibacterial performance is better. It can destroy the cell structure of bacteria and mold through producing reactive oxygen species and other ways, and inhibit the growth and reproduction of bacteria and mold.

[0027] In the above embodiments, the tests were carried out under the following conditions: The specifications of the base fabric are as follows:

[0028] The process execution parameters are as follows:

[0029] The composite liquid formula is as follows:

[0030] The antibacterial performance comparison of different formulas is as follows:

[0031] The influence of plasma parameters on the binding force is as follows:

[0032] The durability test results are as follows:

[0033] The modified nano zinc oxide has the following properties:

[0034] Antibacterial and mildewproof synergism: tea tree oil (terpinen-4-ol) destroys microbial cell membranes + nano ZnO produces reactive oxygen + PHMB blocks DNA replication → triple killing mechanism. The inhibition rate of Aspergillus niger is 100%.

[0035] In step S1, the pH of the alkaline cleaning solution is 10-12; in step S2, the purity of the argon gas introduced into the vacuum reaction chamber is ≥99.99%, and the power of the pulse power source is 300-500 W and the frequency is 20-40 kHz. In step S1 of the present embodiment, the alkaline cleaning solution with a pH value of 10-12 has strong decontamination and activation ability. During the production, transportation and storage of the fabric, contaminants such as oil, dust and chemical additive residues may be attached to the surface of the fabric. The alkaline cleaning solution can effectively remove these impurities through saponification and emulsification reactions, making the fabric surface clean. Moreover, such an alkaline environment can promote the swelling and activation of the molecular chains on the surface of the fabric fibers to some extent, increasing the roughness and reactive sites on the surface of the fibers. Not only does this facilitate the interaction between the plasma and the fibers during subsequent plasma treatment, but it also improves the adhesion of the composite solution on the fabric surface, allowing the antibacterial and mildewproof ingredients to be more firmly combined with the fabric. In step S2, high-purity argon gas plays a key role in the vacuum reaction chamber. High-purity argon gas can ensure the purity of the plasma generation environment, avoiding interference from other impurity gases that may affect the formation and performance of the plasma. Under the conditions of a pulse power source power of 300-500 W and a frequency of 20-40 kHz, argon gas is excited to form plasma. Plasma is rich in high-energy particles such as ions and electrons, which can bombard the surface of the fabric, further etching the surface of the fibers to form a micro concave-convex structure on the surface of the fibers, greatly increasing the specific surface area of the fabric. At the same time, the energy of the plasma can also induce the breaking and recombination of chemical bonds on the surface of the fibers, introducing more polar groups such as hydroxyl and carboxyl groups. Polar groups can form stronger chemical bonding with the ingredients in the chitosan- tea tree oil composite solution, thereby significantly improving the loading capacity and binding strength of the composite solution on the fabric.

[0036] The outer surface of the hot press roller in step S4 is provided with a micro-pit array, the pits in the micro-pit array have a diameter of 100-200 μm and a depth of 50-100 μm; the pit density is 200-300 per cm2. In this embodiment, the micro-pit array plays an important role in terms of the degree of combination of the composite liquid and the fabric. The pit diameter is 100-200 μm, the depth is 50-100 μm, and the pit density reaches 200-300 per cm2. During the hot pressing process, these micro-pits can store a certain amount of chitosan- tea tree oil composite liquid. When the hot press roller contacts the fabric, the composite liquid is squeezed out of the pits and uniformly transferred to the surface of the fabric, so that the composite liquid can more fully penetrate into the gaps between the fibers of the fabric. Compared with ordinary hot press rollers, the micro-pit array design increases the contact area and contact depth of the composite liquid with the fabric, thereby significantly improving the adhesion amount and adhesion fastness of the composite liquid on the fabric. Even if the fabric is rubbed and washed many times, the composite liquid is not easy to fall off, ensuring the durability of the antibacterial and mildew-proof performance of the fabric. During the hot pressing process, the micro-pits produce a certain amount of extrusion and shaping effect on the surface of the fabric. Due to the presence of pits, the surface of the fabric will form a micro-undulating structure, which increases the softness and elasticity of the fabric to some extent. At the same time, the microstructure also improves the air permeability of the fabric, because air can flow between these tiny undulations, improving the wearing comfort of the fabric. The micro-pit array helps to improve the uniformity of the hot pressing process. When hot pressing, the pits can uniformly disperse the pressure, so that the pressure received by each part of the fabric is more consistent. Avoid uneven distribution of composite liquid, fabric deformation and other problems caused by uneven local pressure, ensuring the stability of the overall quality of the fabric.

[0037] The viscosity control method of the chitosan- tea tree oil composite liquid: adding sodium carboxymethyl cellulose to adjust the viscosity to 450-650 mPa-s; the viscosity detection uses a rotary viscometer; when the viscosity is greater than 650 mPa-s, supplement with deionized water, and when the viscosity is less than 450 mPa-s, supplement with 0.5% sodium carboxymethyl cellulose solution. In this embodiment, from the adhesion of the composite liquid to the fabric, adjusting the viscosity to 450-650 mPa-s is extremely critical. The appropriate viscosity can ensure that the composite liquid forms a uniform and continuous coating on the fabric surface. If the viscosity is too low, less than 450 mPa-s, the composite liquid has too strong flowability and is prone to dripping or flowing during spraying or dipping, resulting in uneven distribution of the composite liquid on the fabric and the inability to form an effective antibacterial and mildew-proof protective layer. When the viscosity is too high, greater than 650 mPa-s, the composite liquid is too viscous and difficult to penetrate into the fabric fibers, and may only form a relatively thick layer on the fabric surface, not only wasting materials, but also affecting the air permeability and softness of the fabric. By adding sodium carboxymethyl cellulose to control the viscosity within the appropriate range, the composite liquid can fully soak the fabric fibers and form a stable antibacterial and mildew-proof network structure on the surface and inside of the fibers, thereby improving the antibacterial and mildew-proof performance of the fabric. In terms of construction process, appropriate viscosity is beneficial to improve production efficiency and product quality stability. Real-time monitoring with a rotary viscometer can accurately grasp the viscosity changes of the composite liquid. When the viscosity exceeds the set range, measures such as supplementing deionized water or 0.5% sodium carboxymethyl cellulose solution can be taken to adjust it. The dynamic viscosity control method ensures that the composite liquid always maintains stable performance during the entire production process, so that the quality of each batch of antibacterial and mildew-proof composite fabric can be effectively guaranteed. Moreover, stable viscosity also facilitates the control of process parameters such as spraying or dipping, reducing production failures and defective rates caused by fluctuations in the performance of the composite liquid.

[0038] As Figures 1-4As shown, a kind of plasma processing system for implementing the plasma treatment process of the antibacterial mildew-proof composite fabric, including successively arranged along production line: base cloth unwinding mechanism 1, plasma processing cabin 2, composite liquid spraying cabin 3, gradient solidification mechanism 4 and finished product winding mechanism 5;The base cloth unwinding mechanism 1 is used for polyester and cotton blended fabric to be immersed in alkaline cleaning solution, and is unwound by unwinding roller towards plasma processing cabin 2;Rotating electrode group 21 and argon supply module 22 are arranged in the plasma processing cabin 2, and the vacuum degree in the plasma processing cabin 2 is maintained at 10-50Pa;The composite liquid spraying cabin 3 is provided with high-pressure spray gun array 31, and the high-pressure spray gun array 31 is used for high-pressure spraying of chitosan- tea tree oil composite liquid, the gradient solidification mechanism 4 includes infrared pre-drying oven 41 and hot roller group 42, to be used for solidification of chitosan- tea tree oil composite liquid;The finished product winding mechanism 5 is used for the base cloth after solidification to be wound.In the embodiment for implementing the plasma treatment process of the antibacterial mildew-proof composite fabric, the base cloth unwinding mechanism 1 can not only be immersed in alkaline cleaning solution for pretreatment of polyester and cotton blended fabric, remove impurities and oil stains on the surface of fabric, but also orderly deliver the pretreated base cloth to the plasma processing cabin 2 by unwinding roller, ensure the continuity and stability of production line.The rotating electrode group 21 and argon supply module 22 in the plasma processing cabin 2 are key parts.The rotating electrode group 21 can make plasma more uniformly act on the surface of base cloth, and the argon supply module 22 provides suitable processing atmosphere.The vacuum degree in the cabin is maintained at 10-50Pa, in combination with the action of argon plasma, can make more active groups on the surface of base cloth, improve the roughness and chemical activity of surface, enhance the binding force between subsequent composite liquid and base cloth, thereby effectively improve the antibacterial mildew-proof performance and overall quality of fabric.The high-pressure spray gun array 31 in the composite liquid spraying cabin 3 can uniformly and high-pressure spray chitosan- tea tree oil composite liquid on the activated base cloth.The uniform spraying ensures the coverage of composite liquid on the surface of base cloth, fully plays the antibacterial mildew-proof efficacy of chitosan and tea tree oil, so that the fabric has good antibacterial mildew-proof ability.The infrared pre-drying oven 41 and hot roller group 42 of gradient solidification mechanism 4 have clear division of labor.The infrared pre-drying oven 41 can preliminarily solidify the composite liquid at lower temperature, to prevent the composite liquid from flowing in subsequent hot pressing process.The hot roller group 42 further solidifies the composite liquid under high temperature and high pressure, so that the composite liquid is tightly combined with base cloth, improve the durability and stability of fabric, ensure that the antibacterial mildew-proof performance is durable and effective.The finished product winding mechanism 5 winds the solidified base cloth, for subsequent storage, transportation and processing.The whole system realizes the automation and continuous production of plasma treatment process of antibacterial mildew-proof composite fabric, improves production efficiency and product quality.

[0039] The cabin body of the plasma treatment cabin 2 is a double-layer water-cooled stainless steel structure, and the inner lining is a ceramic insulation layer; the rotating electrode group 21 includes multiple pairs of rod-shaped electrodes 211, and the argon gas supply module 22 includes a mass flow meter; specifically, the rod-shaped electrodes 211 are driven to rotate by a servo motor; and the surface of the rod-shaped electrodes 211 is plated with a yttrium-stabilized zirconia coating. In this embodiment, the plasma treatment cabin 2 adopts a double-layer water-cooled stainless steel structure, which has excellent heat dissipation and durability. A large amount of heat is generated during the plasma treatment process, and the double-layer water-cooled structure can effectively remove the heat in time to ensure the stability of the temperature in the treatment cabin. It helps to maintain the stable generation and performance of the plasma, and also prevents damage to the fabric caused by high temperature, ensuring that the physical properties of the fabric are not affected. The stainless steel material ensures the strength and corrosion resistance of the treatment cabin, prolongs the service life of the equipment, and reduces the maintenance cost. The ceramic insulation layer lining further enhances the insulation performance of the treatment cabin, prevents current leakage, ensures the safety of the operator, and also provides a good environment for the stable generation of the plasma. The rod-shaped electrodes 211 in the rotating electrode group 21 are driven to rotate by a servo motor, which can make the plasma more evenly distributed in the treatment cabin. During rotation, the rod-shaped electrodes 211 can generate plasma from different angles and positions, avoiding the problem of inconsistent fabric treatment effect caused by uneven distribution of plasma. The antibacterial and mildew-resistant composite liquid can be more evenly attached to the surface of the fabric, improving the consistency and stability of the fabric's antibacterial and mildew-resistant performance. The mass flow meter of the argon gas supply module 22 can accurately control the flow of argon. In the plasma treatment, the flow of argon has an important influence on the generation and performance of the plasma. The mass flow meter can accurately adjust the supply amount of argon according to the requirements of the treatment process, ensuring the stability and activity of the plasma, thereby improving the treatment effect. The surface of the rod-shaped electrodes 211 is plated with a yttrium-stabilized zirconia coating, which enhances the corrosion resistance and high-temperature resistance of the electrodes. In the high-energy environment of plasma generation, the electrodes are easily affected by corrosion and high temperature and damaged. The yttrium-stabilized zirconia coating can effectively protect the electrodes, prolong the service life of the electrodes, reduce equipment failures and downtime caused by electrode damage, and improve production efficiency.

[0040] The high-pressure spray gun array 31 is arranged in a herringbone shape, with a spray distance of 150-250 mm. In this embodiment, the herringbone arrangement of the high-pressure spray gun array 31 plays a key role in the uniformity of the composite liquid spraying. It allows the spray guns to spray the fabric from multiple angles. When the composite liquid is sprayed from the spray guns, the sprays from different spray guns interweave and complement each other, providing more comprehensive coverage of the fabric surface compared to traditional linear arrangements or single spray gun spraying. In the edge and corner areas of the fabric where dead spots are prone to occur, the herringbone arrangement of the spray guns also ensures effective coverage of the composite liquid, thereby ensuring uniform distribution of the antibacterial and mildew-resistant composite liquid on the fabric. Uniform spraying helps to form a complete and continuous antibacterial and mildew-resistant protective layer, avoiding the situation where the antibacterial and mildew-resistant performance of some parts of the fabric is poor due to the lack of local composite liquid, greatly improving the overall antibacterial and mildew-resistant effect of the fabric. The appropriate spray distance ensures that the composite liquid reaches the fabric surface in a good atomized state. If the spray distance is too close, the composite liquid may hit the fabric with a large impact force, causing the composite liquid to splash and distribute unevenly, and even possibly damaging the structure of the fabric; if the spray distance is too far, the composite liquid will disperse excessively during flight, reducing its concentration when it reaches the fabric surface, and it may not effectively adhere to the fabric.

[0041] The roller surface of the hot press roller set 42 is engraved with a micro-pit array 421 by laser, and the surface is coated with a diamond-like carbon film. In this embodiment, the micro-pits engraved by laser can store a certain amount of antibacterial and mildew-resistant composite liquid during the hot pressing process. When the hot press roller comes into contact with the fabric, the stored composite liquid is evenly squeezed out and transferred to the fabric surface, allowing the composite liquid to penetrate more fully into the gaps of the fabric fibers. Compared to ordinary hot press roller surfaces, the micro-pit array 421 increases the contact area and depth of the composite liquid with the fabric, thereby improving the adhesion amount and adhesion strength of the composite liquid on the fabric. This means that the antibacterial and mildew-resistant composite liquid can still adhere firmly to the fabric after multiple uses and washes, ensuring the durability and stability of the fabric's antibacterial and mildew-resistant performance. The application of the diamond-like carbon film further enhances the performance of the hot press roller. The diamond-like carbon film has excellent hardness and wear resistance, effectively resisting friction and wear between the fabric and the roller surface during the hot pressing process. This significantly extends the service life of the hot press roller, reducing the frequency of equipment replacement and maintenance costs. At the same time, the diamond-like carbon film also has good chemical stability and low surface energy, preventing the antibacterial and mildew-resistant composite liquid from sticking and accumulating on the roller surface. This avoids the pollution and uneven hot pressing of the roller surface caused by the residual composite liquid, ensuring that the composite liquid is evenly transferred to the fabric surface during each hot pressing process, thereby improving the consistency of the fabric's antibacterial and mildew-resistant performance.

[0042] The above embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A plasma treatment process for antibacterial and mildew-proof composite fabrics, characterized in that: The following steps are involved: Step S1, base fabric pretreatment: immersing the polyester and cotton blended fabric in an alkaline cleaning solution and ultrasonically treating for 10-15 minutes; Step S2, plasma activation: argon gas is introduced into the vacuum reaction chamber and pulse power is applied for 3-8 minutes; During the treatment, the plasma parameters include vacuum degree: 10-20Pa; argon flow rate: 30-50mL / min; electrode spacing: 50-80mm; Step S3, spraying the composite liquid: spraying the chitosan-tea tree oil composite liquid onto the activated base fabric using a high-pressure spray gun at a spraying amount of 15-25 g / m²; Step S4, gradient curing: pre-curing at 60-70°C for 2-4 minutes, then hot pressing with a roller at 120-140°C and a pressure of 5-8 MPa for 30-60 seconds.

2. The plasma treatment process for antibacterial and mildew-proof composite fabric according to claim 1, characterized in that: Formula of chitosan-tea tree oil complex liquid: Chitosan: 1.5-2.5%; Tea tree essential oil: 3-5%; Nano zinc oxide: 0.8-1.5%; Citric acid crosslinker: 0.5-1%; and the balance deionized water.

3. The plasma treatment process for antibacterial and mildew-proof composite fabric according to claim 1 or 2, characterized in that: Polyhexamethylene biguanide is added to the chitosan-tea tree oil composite liquid in an amount of 0.3-0.8%; after hot pressing, a fluorine-based waterproofing agent with a padding concentration of 30g / L is added.

4. The plasma treatment process for antibacterial and mildew-proof composite fabric according to claim 1, characterized in that: Surface modification of nano-zinc oxide: treatment with silane coupling agent KH-550, with an addition amount of 1-2wt%; after modification, the Zeta potential is ≥+35mV, and the pH is 6.

5.

5. The plasma treatment process for antibacterial and mildew-proof composite fabric according to claim 1, characterized in that: In step S1, the pH of the alkaline cleaning solution is 10-12; in step S2, argon gas with a purity of ≥99.99% is introduced into the vacuum reaction chamber, and the power of the applied pulse power supply is 300-500W and the frequency is 20-40kHz.

6. The plasma treatment process for antibacterial and mildew-proof composite fabric according to claim 1, characterized in that: In step S4, the outer surface of the hot pressing roller is provided with a micro-pit array, wherein the pits in the micro-pit array have a diameter of 100-200 μm and a depth of 50-100 μm; and the pit density is 200-300 / cm².

7. The plasma treatment process for antibacterial and mildew-proof composite fabric according to claim 1, characterized in that: Viscosity control method for chitosan-tea tree oil composite liquid: sodium carboxymethyl cellulose was added to adjust the viscosity to 450-650 mPa·s; the viscosity was measured using a rotational viscometer; when the viscosity was greater than 650 mPa·s, deionized water was added; when it was less than 450 mPa·s, 0.5% sodium carboxymethyl cellulose solution was added.

8. A plasma treatment system for carrying out the plasma treatment process for the antibacterial and mildew-proof composite fabric according to any one of claims 1 to 7, characterized in that: The invention comprises: a base fabric unwinding mechanism, a plasma treatment chamber, a composite liquid spraying chamber, a gradient curing mechanism and a finished product winding mechanism which are arranged in sequence along the production line; the base fabric unwinding mechanism is used to immerse polyester and cotton blended fabric in an alkaline cleaning solution and unwind the fabric toward the plasma treatment chamber through an unwinding roller; a rotating electrode group and an argon supply module are provided in the plasma treatment chamber, and the vacuum degree in the plasma treatment chamber is maintained at 10-50 Pa; the composite liquid spraying chamber is provided with a high-pressure spray gun array, which is used to spray the chitosan-tea tree oil composite liquid at high pressure; the gradient curing mechanism comprises an infrared pre-drying oven and a hot pressing roller group for curing the chitosan-tea tree oil composite liquid; the finished product winding mechanism is used to wind up the cured base fabric.

9. The plasma processing system according to claim 8, wherein: The plasma processing chamber has a double-layer water-cooled stainless steel structure and a ceramic insulating layer as its lining; the rotating electrode group includes multiple pairs of rod-shaped electrodes, and the argon gas supply module includes a mass flow meter; The rod-shaped electrode is driven to rotate by a servo motor; and the surface of the rod-shaped electrode is plated with a yttrium-stabilized zirconium oxide coating.

10. The plasma processing system according to claim 8, wherein: The high-pressure spray gun array is arranged in a herringbone pattern, with a spray distance of 150-250mm; The roller surface of the hot pressing roller group is laser engraved with a micro-pit array and coated with a diamond-like carbon film.

Images