Preparation method of waterproof antibacterial cloth for clothes and cloth

Abstract

The invention relates to the technical field of textile materials, in particular to a preparation method of waterproof antibacterial cloth for clothes and the cloth, and the preparation method comprises the following steps: putting polyester cloth in warm water, adding a concentrated alkaline cleaning agent for washing, then activating in a steam environment, preparing functional finishing liquid, dipping the cloth in the functional finishing liquid, and passing through a microcirculation pump to obtain the waterproof antibacterial cloth for clothes. The preparation method comprises the following steps: soaking for 4-8 minutes by controlling the flow, heating to 50-70 DEG C after soaking, increasing the pressure, applying 15-35 Hz vibration for 7-11 minutes, synchronously adding a catalyst, heating to 100-115 DEG C in a pulse manner, circulating for 3 times at the rate of 5 DEG C / s, controlling the single circulation time to 3-6 minutes, controlling the total time to 9-18 minutes, controlling the pressure to 0.2-0.5 bar, drying for 3-7 minutes by infrared at the temperature of 40-60 DEG C, and curing for 3-5 minutes by dual-band ultraviolet rays. After a 0.5%-1% polyethylene glycol solution is sprayed, drying is conducted for 3-5 minutes, and the waterproof and antibacterial coating has excellent waterproof performance and antibacterial performance; the fabric has good moisture permeability and air permeability and is comfortable to wear; the antibacterial effect is lasting, safe and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of textile materials, and more specifically, it relates to a preparation method and a fabric for waterproof and antibacterial clothing. Background Art

[0002] With the improvement of people's living standards and the enhancement of health awareness, the functional requirements for clothing are increasing day by day. As important functional indicators, waterproof and antibacterial properties have been widely applied in modern textiles. Although significant progress has been made in waterproof and antibacterial technologies respectively, effectively combining the two and simultaneously meeting high performance, high comfort, and high durability still poses challenges.

[0003] For existing waterproof and antibacterial composite fabrics, in order to pursue high waterproof performance, a coating or film layer structure is often adopted to form a water barrier. Although coating finishing can effectively prevent moisture, the air permeability is poor, and the wearing comfort is reduced. Especially in a sports or humid environment, it is easy to feel stuffy and airtight. In addition, in order to endow textiles with antibacterial functions and inhibit the growth of microorganisms such as bacteria and fungi, organic or inorganic antibacterial agents (such as quaternary ammonium salts, organosilicon quaternary ammonium salts, silver-based antibacterial agents, etc.) are finished on the fabric surface by padding, coating, etc. This method has a simple process and low cost, but the antibacterial agent is easily washed away, and the durability of the antibacterial effect is poor. Summary of the Invention

[0004] Therefore, the purpose of the present invention is to provide a preparation method and a fabric for waterproof and antibacterial clothing, which have excellent waterproof and antibacterial properties at the same time; have good moisture permeability and air permeability, and are comfortable to wear; and have a long-lasting, safe and reliable antibacterial effect.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A preparation method for a waterproof and antibacterial fabric for clothing, comprising the following steps:

[0007] S1. Pretreatment: Place the polyester fabric in warm water at 30 - 50 °C, add an alkaline cleaning agent with a concentration of 0.1% - 1% and wash for 3 - 8 minutes, then activate it in a steam environment at 90 - 110 °C and a humidity of 80% - 85% for 1 - 3 minutes, and dry to a moisture content of ≤5%;

[0008] S2. Preparation of the functional finishing liquid: It contains 5% - 10% of silane compounds, 2% - 5% of carboxymethyl chitosan derivatives, 1% - 3% of nano-titanium dioxide pretreated with KH550 silane coupling agent, and 0.5% - 2% of nano-cellulose;

[0009] S3. Impregnation step: Immerse the polyester fabric in an impregnation tank containing a functional finishing solution, and control the flow rate at 50 - 100 L / min for 4 - 8 minutes through a microcirculation pump under the conditions of 25 - 45°C and a pressure of 0.1 - 0.15 bar;

[0010] S4. Activation step: Heat up to 50 - 70°C, increase the pressure to 0.15 - 0.35 bar, apply vibration at 15 - 35 Hz for 7 - 11 minutes, and simultaneously add 0.005% - 0.02% boric acid catalyst;

[0011] S5. Curing step: Pulse - type heating to 100 - 115°C, perform 3 cycles at a rate of 5°C / s, with the duration of each cycle being 3 - 6 minutes and the total duration being 9 - 18 minutes, and control the pressure at 0.2 - 0.5 bar;

[0012] S6. Post - treatment step: Infrared drying at 40 - 60°C for 3 - 7 minutes, double - band ultraviolet curing for 3 - 5 minutes, spray 0.5% - 1% polyethylene glycol solution, and then dry at 50 - 70°C for 3 - 5 minutes.

[0013] The present invention is further configured as: The alkaline cleaning agent described in step S1 is sodium carbonate with a concentration of 0.5%;

[0014] The present invention is further configured as: The nano - titanium dioxide described in step S2 is anatase type with a particle size of 20 - 50 nm, and the dosage of silane coupling agent KH550 is 1% - 3% of the mass of titanium dioxide; The length of the nano - cellulose is ≤500 nm, and the aspect ratio is ≥60.

[0015] The present invention is further configured as: Add 0.1% - 0.5% sodium polyacrylate dispersant to the impregnation liquid in step S3, and control the solution viscosity at 30 - 50 mPa·s.

[0016] The present invention is further configured as: The boric acid catalyst in step S4 is added in three gradients during the activation stage. Specifically, 50% is added for the first time, 30% for the second time, and 20% for the last time, with an interval of 2 minutes between each addition. The vibration frequency is alternately carried out in the low - frequency band of 15 - 25 Hz and the high - frequency band of 30 - 35 Hz.

[0017] The present invention is further configured as: The pressure control in step S5 adopts segmented control, specifically:

[0018] The pressure in the first stage is 0.25 - 0.3 bar, and the time is 5 - 8 minutes;

[0019] The pressure in the second stage is 0.4 bar, and the time is 6 - 9 minutes;

[0020] The pressure in the third stage is 0.3 bar, and the time is 2 - 5 minutes;

[0021] The present invention is further configured such that: in step S6, the dual-band ultraviolet irradiation intensity is 80 - 100 mW / cm²;

[0022] The polyethylene glycol solution passes through a pressure atomizing nozzle with a nozzle aperture of 0.2 - 0.5 mm, an atomizing pressure of 0.2 - 0.5 bar, and is sprayed at a density of 10 - 15 g / m².

[0023] The present invention is further configured such that: in step S4, an ultra - micro bubble generator (bubble diameter < 50 μm) is added, the gas flow rate is 0.05 - 0.1 L / min, and it alternates with vibration to promote catalyst dispersion.

[0024] The present invention is further configured such that: in the activation stage of step S4, 0.01% - 0.015% citric acid is added as an auxiliary catalyst, and the mass ratio of citric acid to boric acid is 1:2 - 1:4.

[0025] The present invention is further configured as: a waterproof and antibacterial fabric for clothing prepared by the method.

[0026] By adopting a series of refined control means such as stepped pressure control, segmented temperature and pressure increase control, gradient catalyst addition, alternating vibration frequency, multi - stepped pulsed heating and curing, and intelligent optimization in key steps such as impregnation, activation, and curing, the precise regulation of the fabric preparation process is achieved, thereby endowing the polyester fabric with excellent comprehensive properties such as waterproofness, antibacterial property, breathability, hand feeling, and durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a flow schematic diagram of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Refer to Figure 1 A further description is made for a method for preparing a waterproof and antibacterial fabric for clothing according to the present invention and the fabric prepared by this preparation method, specifically as follows:

[0029] Example 1:

[0030] The first step, pretreatment, aims to remove impurities, oil stains, sizing agents, etc. on the surface of the polyester fabric, improve the cleanliness and wettability of the fabric, and lay a foundation for the uniform impregnation and effective combination of the subsequent functional finishing liquid. The steam activation treatment further activates the fiber surface, increases its active sites, and improves the finishing effect. The drying step ensures that the fabric reaches an appropriate moisture content before the subsequent impregnation step, avoids dilution of the functional finishing liquid, and ensures the concentration and effect of the finishing liquid.

[0031] Specifically: Place the polyester fabric in warm water at 30°C, add an alkaline cleaning agent with a concentration of 0.1% (this is sodium carbonate with a concentration of 0.5%), wash for 3 minutes, then activate it in a steam environment at 90°C and a humidity of 80% for 1 minute, and dry it to a moisture content of ≤5%;

[0032] Warm water temperature (30 - 50°C): Warm water helps to increase the solubility and activity of the alkaline cleaning agent, accelerating the removal of impurities.

[0033] Alkaline cleaning agent (sodium carbonate, concentration 0.5%): The alkaline cleaning agent is used to saponify oil stains and emulsify waxes, etc. Sodium carbonate, as a mild alkaline agent, causes little damage to polyester fibers and is easy to rinse. The concentration is controlled within the range of 0.1% - 1% to ensure the cleaning effect while avoiding excessive alkaline damage to the fibers. It is preferably 0.5% sodium carbonate concentration, which is more mild and economical while ensuring the cleaning effect.

[0034] Activation in a steam environment (90 - 110°C, humidity 80% - 85%, 1 - 3 minutes): High-temperature steam can effectively remove tiny impurities deep in the fabric and activate the surface of polyester fibers, increasing their surface energy and enhancing the binding force with the functional finishing liquid. The humidity is controlled at 80% - 85% to ensure the steam activation effect, and the time is controlled at 1 - 3 minutes to avoid excessive hydrolysis or damage of the fibers.

[0035] The second step: Preparation of the functional finishing liquid:

[0036] Silane compound 5%: As the main waterproofing agent, the silane compound can form a hydrophobic film layer on the fabric surface.

[0037] Carboxymethyl chitosan derivative 2%: As an antibacterial agent, the carboxymethyl chitosan derivative has good antibacterial properties and biocompatibility, and can form an antibacterial layer on the fabric surface to inhibit the growth and reproduction of bacteria.

[0038] Nanometer titanium dioxide 1%, and the dosage of silane coupling agent KH550 is 1% of the mass of titanium dioxide, which can improve its compatibility and dispersibility with organic polymers and enhance the mechanical strength and durability of the film layer. The nanometer titanium dioxide is anatase type with a particle size of 20nm, ensuring its good dispersibility and functionality.

[0039] Nanocellulose 0.5%: As a natural polymer material, nanocellulose has the advantages of high strength, high modulus, and good biodegradability. Adding it to the functional finishing liquid can improve the strength and toughness of the film layer and enhance the comprehensive performance of the film layer.

[0040] The length of the nanocellulose ≤500nm, and the aspect ratio ≥60. The short and high-aspect-ratio nanocellulose is easier to disperse and can better play a strengthening role in the film layer.

[0041] The components are uniformly dispersed and mixed by means of high-speed stirring, ultrasonic dispersion, etc. to prepare a uniform and stable functional finishing liquid.

[0042] The third step, the impregnation step. The equipment used in this step includes:

[0043] Impregnation tank: used to hold the functional finishing liquid and the fabric.

[0044] Microcirculation pump: provides the power for the circulation of the impregnation liquid to ensure the uniformity of the impregnation liquid.

[0045] Pressure control device: controls the pressure in the impregnation tank.

[0046] Temperature control device: controls the temperature of the impregnation liquid.

[0047] Viscometer: used to measure and control the viscosity of the impregnation liquid.

[0048] The functional finishing liquid is placed in the impregnation tank, and then the polyester fabric is impregnated in the impregnation tank. The impregnation process is carried out at 25°C and a pressure of 0.1 bar. Through the microcirculation pump, the flow rate is controlled at 50 L / min for 4 minutes; during this period, 0.1% dispersant sodium polyacrylate is added to the impregnation liquid, and the solution viscosity is controlled at 30 mPa·s.

[0049] The fourth step, the activation step:

[0050] The temperature is raised to 50°C, the pressure is increased to 0.15 bar, and vibration at 15 Hz is applied for 7 minutes. Meanwhile, 0.005% boric acid catalyst is added. As a catalyst, boric acid can effectively promote the condensation reaction between the silane compound and the hydroxyl groups on the surface of the polyester fiber, accelerating the formation of the film layer.

[0051] When adding the boric acid catalyst, it is added in a staged manner. Specifically, 50% is added for the first time, 30% for the second time, and 20% for the last time. The interval between each addition is 2 minutes. During this period, 0.01% citric acid is added as an auxiliary catalyst, and the mass ratio of citric acid to boric acid is 1:2. As an auxiliary catalyst, citric acid acts synergistically with boric acid to further improve the catalytic efficiency.

[0052] The vibration frequency alternates between the 15 Hz low-frequency band and the 30 Hz high-frequency band. Vibration helps to improve the dispersibility and permeability of the components of the functional finishing liquid on the fabric surface, promoting the uniformity of the reaction. By alternating the vibration between the low-frequency band and the high-frequency band, the dispersion and penetration can be more effectively promoted.

[0053] During activation, an ultramicrobubble generator (bubble diameter < 50 μm) is added, with an air flow rate of 0.05 L / min, and it alternates with the vibration to promote the dispersion of the catalyst.

[0054] Fifth step, curing step. The equipment used in this step includes:

[0055] Reactor / activation tank: A sealed container that can be heated, pressurized, and vibrated.

[0056] Heating system: Precise control of the reaction temperature.

[0057] Pressure control system: Precise control of the reaction pressure.

[0058] Vibration device: Provide adjustable frequency vibration.

[0059] Ultra-microbubble generator: Generate ultra-microbubbles to promote dispersion.

[0060] Pulse heating can rapidly increase the temperature and maintain it for a certain period at the high-temperature stage to promote the cross-linking reaction. During this period, the pulse temperature increase is 100°C, and it is carried out 3 times in cycles at a rate of 5°C / s. The duration of each cycle is 3 minutes, and the total duration is 9 minutes. And the pressure is controlled at 0.2 bar. The specific pressure control process is as follows:

[0061] The pressure in the first stage is 0.2 bar, and the time is 5 minutes; maintaining a certain period at a lower pressure helps the preliminary formation and spreading of the film layer.

[0062] The pressure in the second stage is 0.4 bar, and the time is 8 minutes; maintaining a certain period at a higher pressure helps improve the denseness and strength of the film layer.

[0063] The pressure in the third stage is 0.3 bar, and the time is 3 minutes; the pressure drops back to the medium level and is maintained for a certain period, which helps eliminate the internal stress of the film layer and improve the stability of the film layer.

[0064] Sixth step, the equipment required for the post-treatment step:

[0065] Infrared drying equipment: Provide infrared heat source for drying.

[0066] Dual-band ultraviolet curing equipment: Provide dual-band ultraviolet light source for curing.

[0067] Spraying equipment: Includes pressure atomizing nozzle, solution storage tank, pressure control system, etc.

[0068] Drying equipment: Such as oven, hot air drying equipment, etc., used for drying the polyethylene glycol solution.

[0069] After infrared drying at 40°C for 3 minutes and dual-band ultraviolet curing for 3 minutes, the intensity of dual-band ultraviolet irradiation is 80 mW / cm², which can effectively promote the cross-linking reaction inside the film layer and improve the denseness, strength, and durability of the film layer; after spraying 0.5% polyethylene glycol solution, it is dried at 50°C for 3 minutes. Polyethylene glycol, as a softener, can improve the feel of the fabric.

[0070] During the process, the polyethylene glycol solution is sprayed through a pressure atomizing nozzle with a pore diameter of 0.2 mm at an atomizing pressure of 0.2 bar at a density of 10 g / m², ensuring a soft effect while avoiding over-wetting of the fabric or a greasy handfeel.

[0071] Example 2:

[0072] First step, pretreatment: Place the polyester fabric in warm water at 50°C, add an alkaline cleaning agent with a concentration of 1% (this is sodium carbonate with a concentration of 0.5%) and wash for 8 minutes. Then, activate it in a steam environment at 110°C and a humidity of 85% for 3 minutes, and dry it to a moisture content ≤ 5%.

[0073] Second step, preparation of the functional finishing solution:

[0074] 10% of silane compounds, 3% of nano-titanium dioxide, the dosage of silane coupling agent KH550 is 3% of the mass of titanium dioxide. The nano-titanium dioxide is anatase type with a particle size of 20 - 50 nm, 2% of nano-cellulose, the length of the nano-cellulose ≤ 500 nm, and the aspect ratio ≥ 60.

[0075] Third step, impregnation step: The impregnation process is carried out at 45°C and a pressure of 0.15 bar. Through a microcirculation pump, control the flow rate at 100 L / min and impregnate for 8 minutes. During this period, add 0.5% of the dispersant sodium polyacrylate to the impregnating solution, and control the solution viscosity at 50 mPa·s.

[0076] Fourth step, activation step: Raise the temperature to 70°C, increase the pressure to 0.35 bar, apply vibration at 35 Hz for 11 minutes, and simultaneously add 0.02% of boric acid catalyst. The addition of boric acid catalyst is carried out in a staged manner, specifically, 50% is added for the first time, 30% for the second time, and 20% for the last time, with an interval of 2 minutes between each addition. During this period, add 0.015% of citric acid as an auxiliary catalyst, and the mass ratio of citric acid to boric acid is 1:4. The vibration frequency is alternated between the 25 Hz low-frequency band and the 35 Hz high-frequency band. During activation, add an ultramicrobubble generator (bubble diameter < 50 μm), with an air flow rate of 0.1 L / min, alternating with vibration to promote catalyst dispersion.

[0077] Fifth step, curing step: During this period, the temperature is raised in a pulsed manner to 115°C, at a rate of 5°C / s for 3 cycles, with a single cycle duration of 6 minutes and a total duration of 18 minutes, and the pressure is controlled at 0.5 bar. The specific pressure control process is as follows:

[0078] The pressure in the first stage is 0.3 bar and the time is 7 minutes;

[0079] The pressure in the second stage is 0.4 bar and the time is 9 minutes;

[0080] The pressure in the third stage is 0.3 bar and the time is 2 minutes.

[0081] Sixth step, post-treatment step: infrared drying at 60°C for 7 minutes, dual-band ultraviolet curing for 5 minutes, the irradiation intensity of the dual-band ultraviolet is 100 mW / cm²; after spraying 1% polyethylene glycol solution, drying at 70°C for 5 minutes. During this period, the polyethylene glycol solution passes through a pressure atomizing nozzle with a nozzle aperture of 0.5 mm and an atomizing pressure of 0.5 bar, and is sprayed at a density of 15 g / m², ensuring a soft effect while avoiding the fabric from being too wet or feeling greasy.

[0082] Example 3:

[0083] First step, pretreatment: Place the polyester fabric in warm water at 40°C, add an alkaline cleaning agent with a concentration of 0.5% (this is sodium carbonate with a concentration of 0.5%) and wash for 5 minutes. Subsequently, carry out activation treatment in a steam environment at 100°C and a humidity of 83% for 2 minutes, and dry to a moisture content of ≤5%;

[0084] Second step, preparation of the functional finishing solution:

[0085] 8% silane compound, 2% nano-titanium dioxide, the dosage of silane coupling agent KH550 is 2% of the mass of titanium dioxide, the nano-titanium dioxide is anatase type with a particle size of 30 nm, 1.5% nano-cellulose, the length of the nano-cellulose is ≤500 nm, and the aspect ratio is ≥60.

[0086] Third step, impregnation step: The impregnation process is carried out at 30°C and a pressure of 0.13 bar, and the flow rate is controlled at 80 L / min by a microcirculation pump for 7 minutes; during this period, 0.3% dispersant sodium polyacrylate is added to the impregnation solution, and the solution viscosity is controlled at 40 mPa·s.

[0087] Fourth step, activation step: Heat up to 60°C, increase the pressure to 0.25 bar, apply vibration at 25 Hz for 10 minutes, and synchronously add 0.01% boric acid catalyst. The boric acid is added in a staged manner when adding the boric acid catalyst. Specifically, 50% is added for the first time, 30% for the second time, and 20% for the last time, with an interval of 2 minutes between each addition. During this period, 0.012% citric acid is added as an auxiliary catalyst, and the mass ratio of citric acid to boric acid is 1:3. The vibration frequency is alternated between 20 Hz low-frequency band and 32 Hz high-frequency band. During activation, an ultra-fine bubble generator (bubble diameter <50 μm) is added, and the gas flow rate is 0.06 L / min, which is alternated with the vibration to promote the dispersion of the catalyst.

[0088] Fifth step, curing step: During this step, the temperature is increased in a pulsed manner to 112 °C, and this is carried out in 3 cycles at a rate of 5 °C / s. The duration of each single cycle is 5 minutes, and the total duration is 15 minutes. Also, the pressure is controlled at 0.5 bar. The specific pressure control process is as follows:

[0089] The pressure in the first stage is 0.28 bar and the time is 7 minutes;

[0090] The pressure in the second stage is 0.4 bar and the time is 6 minutes;

[0091] The pressure in the third stage is 0.3 bar and the time is 2 minutes.

[0092] Sixth step, post-treatment step: Infrared drying at 60 °C for 7 minutes, dual-band ultraviolet curing for 5 minutes. The irradiation intensity of the dual-band ultraviolet is 100 mW / cm²; after spraying a 1% polyethylene glycol solution, it is dried at 70 °C for 5 minutes. During this process, the polyethylene glycol solution passes through a pressure atomizing nozzle with a pore diameter of 0.5 mm and an atomizing pressure of 0.5 bar, and is sprayed at a density of 15 g / m², ensuring a soft effect while avoiding the fabric from being overly wet or feeling greasy.

[0093] Comparative example 1: In the activation step, the boric acid and citric acid catalysts were completely removed, and the remaining steps and parameters were basically the same as those in Example 2.

[0094] Comparative example 2: In the curing step, the pulsed heating was changed to continuous heating, and the pressure control was simplified to a constant pressure of 0.35 bar. The heating temperature was set at a constant 110 °C to ensure that it was basically within the same curing temperature range as in Example 2. The total curing time remained unchanged at 18 minutes. The remaining steps and parameters were the same as those in Example 2.

[0095] Comparative example 3: In the impregnation step, the microcirculation pump and the ultra-microbubble generator were cancelled, and a static impregnation method was adopted, that is, the fabric was directly immersed in the functional finishing liquid without circulation and bubble assistance. All other steps and parameters were the same as those in Example 2.

[0096] The fabrics obtained in Examples 1 to 3 and Comparative examples 1 to 3 were subjected to performance testing, and the testing methods were as follows:

[0097] Initial spray water repellency test (Spray Rating Test): Used to evaluate the water wetting resistance performance of the fabric surface.

[0098] Testing standard: GB / T 4749-2016 "Assessment of the waterproof performance of textiles - Water repellency"

[0099] Hydrostatic Pressure Test: Used to evaluate the fabric's ability to resist water, i.e., its ability to withstand water pressure. Test standard: GB / T 4744-2013 Determination of Water Resistance of Textiles - Hydrostatic Pressure Method

[0100] Spray Repellency after Washing Test: Used to evaluate the durability of the fabric's waterproof performance after multiple washes. Select a suitable washing program according to the GB / T 8629-2017 standard.

[0101] Antibacterial Performance Test:

[0102] Antibacterial performance is an indicator to evaluate the fabric's ability to resist the growth and reproduction of bacteria. We recommend using the oscillation method for quantitative antibacterial performance testing and selecting Staphylococcus aureus and Escherichia coli as representative strains for testing to comprehensively evaluate the antibacterial spectrum and antibacterial effect of the fabric. Test standard: GB / T 20944.3-2008 Textiles - Evaluation of Antibacterial Activity - Part 3: Oscillation Method

[0103] III. Air Permeability Test:

[0104] Air permeability is an indicator to evaluate the air permeability of the fabric and directly affects the wearing comfort.

[0105] Test standard: GB / T 5453-1997 Determination of Air Permeability of Textiles

[0106] IV. Handfeel Evaluation:

[0107] Handfeel is one of the important wearing properties of the fabric and directly affects the wearing comfort and the sensory experience of consumers. Handfeel evaluation is usually carried out by subjective evaluation, and a trained sensory evaluation panel is used for scoring. Evaluation method: Sensory Evaluation

[0108] V. Abrasion Resistance Test:

[0109] Abrasion resistance is an indicator to evaluate the fabric's ability to resist friction and wear, which affects the service life and durability of the fabric. We use the Martindale Abrasion Test for abrasion resistance testing. Test standard: GB / T21196-2007 Determination of Abrasion Resistance of Textiles - Martindale Method. Table 1 of the test results is obtained based on the above test method.

[0110] Table 1

[0111]

[0112] Based on Table 1, the data of Examples 1-3 show a trend that the performance improves from Example 1 to Example 2 and then slightly declines to Example 3.

[0113] Comparative Example 1 (without catalyst): All performance indicators are significantly lower than those of Example 2. In particular, the antibacterial performance and wash resistance decrease significantly, and the waterproofness decreases slightly.

[0114] Comparative Example 2 (continuous heating): The performance indicators are also lower than those of Example 2, and the waterproofness and wear resistance decrease significantly.

[0115] Comparative Example 3 (static impregnation): The performance indicators are the worst, and the waterproofness, antibacterial property, and wear resistance all decrease significantly, indicating that the static impregnation effect is far inferior to the dynamic impregnation using a microcirculation pump and an ultramicrobubble generator.

[0116] Handfeel evaluation: Handfeel evaluation is a subjective evaluation. It is recommended to use a sensory evaluation panel to score according to certain standards (such as softness, stiffness, etc.) and take the average value. The larger the handfeel score value, the better the handfeel. The handfeel score of the comparative example is slightly higher than that of the example because the functional film layer is relatively thin or not dense, but the functional indicators will decrease significantly.

[0117] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any ordinary changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A preparation method of a waterproof and antibacterial fabric for clothing, characterized in that, It includes the following steps: S1. Pretreatment: Place the polyester fabric in warm water at 30 - 50°C, add an alkaline cleaning agent with a concentration of 0.1% - 1% and wash for 3 - 8 minutes. Then, activate it in a steam environment at 90 - 110°C and a humidity of 80% - 85% for 1 - 3 minutes, and dry it until the moisture content ≤ 5%; S2. Preparation of the functional finishing solution: It contains 5% - 10% of silane compounds, 2% - 5% of carboxymethyl chitosan derivatives, 1% - 3% of nano - titanium dioxide pretreated with KH550 silane coupling agent, and 0.5% - 2% of nano - cellulose; S3. Impregnation step: Immerse the polyester fabric in an impregnation tank containing the functional finishing solution, and under the conditions of 25 - 45°C and a pressure of 0.1 - 0.15 bar, control the flow rate at 50 - 100 L / min through a micro - circulation pump and impregnate for 4 - 8 minutes; S4. Activation step: Raise the temperature to 50 - 70°C, increase the pressure to 0.15 - 0.35 bar, apply vibration at 15 - 35 Hz for 7 - 11 minutes, and simultaneously add 0.005% - 0.02% of boric acid catalyst; S5. Curing step: Pulse - type heat up to 100 - 115°C, perform 3 cycles at a rate of 5°C / s, with the duration of each cycle being 3 - 6 minutes and the total duration being 9 - 18 minutes, and control the pressure at 0.2 - 0.5 bar; S6. Post - treatment step: Infrared dry at 40 - 60°C for 3 - 7 minutes, cure with dual - band ultraviolet light for 3 - 5 minutes, spray 0.5% - 1% of polyethylene glycol solution, and then dry at 50 - 70°C for 3 - 5 minutes.

2. The preparation method of a waterproof and antibacterial fabric for clothing according to claim 1, characterized in that, The alkaline cleaning agent described in step S1 is sodium carbonate, and the concentration is 0.5%.

3. The preparation method of a waterproof and antibacterial fabric for clothing according to claim 1, characterized in that, The nano - titanium dioxide described in step S2 is anatase type, with a particle size of 20 - 50 nm, and the dosage of silane coupling agent KH550 is 1% - 3% of the mass of titanium dioxide; the length of the nano - cellulose ≤ 500 nm, and the aspect ratio ≥ 60.

4. The preparation method of a waterproof and antibacterial fabric for clothing according to claim 3, characterized in that, Add 0.1% - 0.5% of dispersant sodium polyacrylate to the impregnation solution in step S3, and control the solution viscosity at 30 - 50 mPa·s.

5. The preparation method of a waterproof and antibacterial fabric for clothing according to claim 4, characterized in that The boric acid catalyst in step S4 is added in three gradients during the activation stage. Specifically, 50% is added for the first time, 30% for the second time, and 20% for the last time. The interval between each addition is 2 minutes, and the vibration frequency is alternately carried out in the low - frequency band of 15 - 25 Hz and the high - frequency band of 30 - 35 Hz.

6. The preparation method of a waterproof and antibacterial fabric for clothing according to claim 5, characterized in that The pressure control in step S5 adopts segmented control, specifically: The pressure in the first stage is 0.25 - 0.3 bar, and the time is 5 - 8 minutes; The pressure in the second stage is 0.4 bar, and the time is 7.5 - 9 minutes; The pressure in the third stage is 0.3 bar, and the time is 2 - 5 minutes.

7. The preparation method of a waterproof and antibacterial fabric for clothing according to claim 6, characterized in that, The irradiation intensity of the dual - band ultraviolet light in step S6 is 80 - 100 mW / cm²; The polyethylene glycol solution is sprayed through a pressure atomizing nozzle with a nozzle aperture of 0.2 - 0.5 mm and an atomizing pressure of 0.2 - 0.5 bar at a density of 10 - 15 g / m².

8. The preparation method of a waterproof and antibacterial fabric for clothing according to claim 7, characterized in that, Add an ultra - micro bubble generator (bubble diameter < 50 μm) in step S4, with an air flow rate of 0.05 - 0.1 L / min, and alternate it with vibration to promote the dispersion of the catalyst.

9. The preparation method of a waterproof and antibacterial fabric for clothing according to claim 5, characterized in that, In the activation stage of step S4, 0.01%-0.015% citric acid is added as an auxiliary catalyst, and the mass ratio of citric acid to boric acid is 1:2-1:

4.

10. A waterproof and antibacterial fabric for clothing prepared by the method according to any one of claims 1-9.

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