Soft antibacterial cool-feeling non-woven fabric and preparation method thereof

Abstract

The invention provides a soft antibacterial cool-feeling non-woven fabric and a preparation method thereof.The preparation method comprises the following steps that PLGA and mint extract are dissolved in an organic solvent, an amino silane coupling agent is added, and an oil phase is formed; injecting the oil phase into a water phase containing a surfactant to form a primary emulsion; dispersing the primary emulsion in silicon dioxide sol to form multiple emulsion, and removing the organic solvent and free impurities to obtain the cool-feeling nanoparticle modifier. The soft antibacterial cool-feeling non-woven fabric prepared by the preparation method disclosed by the invention is endowed with excellent and lasting contact cool feeling, antibacterial ability and breathable comfort.

Description

Technical Field

[0001] The present invention relates to the technical field of functional non-woven materials, and particularly to a soft antibacterial and cool-sensation non-woven fabric and a preparation method thereof. Background Art

[0002] Polypropylene (PP) non-woven fabrics are widely used in the fields of medical and health, personal care, home decoration, etc. due to their advantages such as light weight, high strength, and low cost. However, there are still many technical bottlenecks in the coordinated improvement of functionality and comfort of existing polypropylene non-woven fabrics, restricting their expansion in high-end application scenarios. Firstly, in terms of thermal management performance, the thermal conductivity of conventional PP fibers is only about 0.2 W / (m·K), which is much lower than the heat dissipation requirement for the human skin to perceive comfort. This limitation in heat conduction efficiency makes it difficult for the body surface heat to be quickly dissipated, especially in high-temperature or high-humidity environments, which is extremely likely to cause a stuffy feeling and significantly reduce the wearing comfort. Secondly, the problem of the timeliness of antibacterial performance is prominent. Although the commonly used organic antibacterial agents have significant initial antibacterial effects, they are prone to the loss of antibacterial components due to factors such as migration and volatilization during use, and it is difficult to achieve long-term antibacterial; while inorganic antibacterial agents are limited by insufficient active sites, and there is an obvious threshold for the exertion of their antibacterial activity, which cannot meet the antibacterial requirements in long-term use scenarios. Furthermore, the insufficient functional durability seriously affects the service life of the product. Taking the cool-sensation finishing agent as an example, after 5 washes, the retention rate of the cool-sensation finishing agent in the cool-sensation non-woven fabric prepared by the existing treatment process is generally lower than 60%, and it is difficult to maintain a stable cool-sensation performance, restricting the reusability and market competitiveness of the product. In addition, there are technical contradictions in improving comfort. In traditional technologies, when improving the cool-sensation performance by adding a high content of cool-sensation particles or a special coating, the softness of the material is often sacrificed; and if skin-friendly treatment is adopted to improve the soft touch, complex surface modification or post-treatment processes need to be added, which not only increases the production cost but also may introduce new quality control problems. Summary of the Invention

[0003] In view of this, the present invention provides a soft antibacterial and cool-sensation non-woven fabric and a preparation method thereof, which solve the problems that the mint extract is easily decomposed at high temperatures and it is difficult to melt with polypropylene to prepare non-woven fabrics, as well as the conflict that the existing non-woven fabrics are difficult to balance cool-sensation, softness, and antibacterial properties.

[0004] The technical solution of the present invention is realized as follows: In the first aspect, the present invention provides a preparation method of a soft antibacterial and cool-sensation non-woven fabric, including the following steps: Dissolve PLGA and mint extract in an organic solvent, and add an amino-silane coupling agent to form an oil phase; Inject the oil phase into an aqueous phase containing a surfactant to form a primary emulsion; Disperse the colostrum in silica sol to form a multiple emulsion, remove the organic solvent and free impurities to obtain the cool-sensation nanoparticle modifier.

[0005] Using ethyl acetate as the organic solvent, dissolve PLGA and mint extract to form an oil phase, add 3-aminopropyltriethoxysilane (APTES) and silica sol, and form the cool-sensation nanoparticle modifier through interfacial perturbation and solvent evaporation. 3-aminopropyltriethoxysilane (APTES) plays an interfacial bridging role, forming a covalent bond through the condensation reaction between the amino group and the carboxyl group of PLGA to construct an organic-inorganic transition layer. At the same time, 3-aminopropyltriethoxysilane (APTES) also provides active sites for silica deposition; due to the thermal barrier effect of silica and the formation of a three-dimensional network structure by the sol-gel method, which has a low coefficient of thermal expansion, it realizes the controlled release of mint extract and simultaneously blocks thermal degradation.

[0006] On the basis of the above technical solution, further, the cool-sensation nanoparticle modifier includes raw materials in the following parts by weight: the weight part of PLGA is 8-9 parts, the weight part of mint extract is 1-2 parts, the weight part of the amino-silane coupling agent is 0.1-0.3 parts, and the weight part of silica sol is 18-22 parts.

[0007] On the basis of the above technical solution, even further, the amino-silane coupling agent is 3-aminopropyltriethoxysilane.

[0008] On the basis of the above technical solution, further, the following steps are also included: Mix the cool-sensation nanoparticle modifier with a dispersant, a heat stabilizer, a cool-sensation enhancer and polypropylene, and then carry out melt granulation, underwater pelletizing and heat treatment, and obtain the cool-sensation masterbatch after cooling; Among them, the conditions for the melt granulation are: the temperature of the feeding zone is 155°C - 160°C, the temperature of the melting zone is 180°C - 190°C, the temperature of the mixing zone is 195°C - 200°C, and the temperature of the die head zone is 185 - 190°C; The dispersant is a mixture after mixing zinc stearate and maleic anhydride grafted polypropylene; The heat stabilizer is a mixture after mixing pentaerythritol ester and phosphite; The cool-sensation enhancer is boron nitride nanosheets.

[0009] On the basis of the above technical solution, further, the conditions for the melt granulation also include that the screw speed is 250 - 300 rpm.

[0010] The temperature in the feeding zone is 155°C to 160°C, which is lower than the melting point of polymer substrates (such as PET, PP), preventing the material from sticking or caking due to local overheating in the screw feeding section and ensuring the stability of solid conveying.

[0011] The cool-sensation masterbatch is sensitive to high temperatures. Low-temperature feeding can reduce its thermal exposure time before entering the melting zone, avoiding the degradation or agglomeration of the surface modification layer.

[0012] The temperature in the melting zone is 180°C to 190°C, which is 10 - 20°C higher than the melting point of the polymer, ensuring that the substrate is fully melted to form a homogeneous melt, providing a fluid carrier for the subsequent dispersion of the cool-sensation nanoparticle modifier, and needs to be controlled below the polymer thermal degradation temperature to avoid excessive decrease in melt viscosity resulting in screw slippage or energy consumption waste.

[0013] The temperature in the mixing zone is 195°C to 200°C, which can reduce the melt viscosity, cooperate with the high-shear action of the twin-screw, and promote the uniform dispersion of nanoparticles in the polymer matrix. Avoid local overheating, with the temperature slightly higher than the melting zone but lower than the die head zone, preventing the melt temperature from being too high due to shear heating and protecting the dispersion stability of the cool-sensation nanoparticle modifier.

[0014] The temperature in the die head zone is 185 - 190°C, slightly lower than the mixing zone (195°C → 185°C), which can reduce the thermal stress when the melt exits the die head, avoiding die head build-up or extrusion swelling. Control the melt viscosity to match underwater pelletizing. Appropriate melt viscosity can ensure regular particle shape during underwater pelletizing, reducing linked particles or broken particles.

[0015] The temperature gradient from the feeding zone to the die head zone forms a thermal process of "low temperature - melting - high dispersion - stable extrusion", taking into account the protection of the cool-sensation nanoparticle modifier and the processing performance of the substrate.

[0016] Low-temperature underwater pelletizing can quickly absorb the heat carried by the melt during the pelletizing process, enabling the melt to achieve rapid solidification in an extremely short time. This solidification process can not only effectively fix the dispersion state of the cool-sensation nanoparticle modifier in the polymer matrix, preventing the cool-sensation nanoparticle modifier from aggregating due to melt flow or physical effects during subsequent processing, but also effectively avoid the adhesion phenomenon between the cool-sensation nanoparticle modifiers due to melt residue or surface viscosity, thus ensuring that the obtained particles have good dispersibility and dispersion stability, as well as independent particle morphology.

[0017] To further optimize the comprehensive performance of the cool-sensation masterbatch, the cool-sensation masterbatch obtained after pelletizing is subjected to crystallinity regulation treatment.

[0018] The specific process parameters are as follows: The particles are heat-treated at 100°C for 1 hour and then cooled to room temperature at a slow rate. Through the above heat treatment and cooling process, the crystallinity of the masterbatch is accurately controlled within the range of 40 - 45%.

[0019] As one of the key factors affecting the properties of the masterbatch, reasonable control of crystallinity is of great significance for optimizing the cool feeling persistence and processing fluidity of the cool feeling masterbatch. When the crystallinity is within the suitable range of 40 - 45%, the polymer molecular chains in the cool feeling masterbatch can form a certain degree of ordered arrangement, endowing the cool feeling masterbatch with certain structural stability and mechanical properties, and at the same time, sufficient amorphous regions can be retained to provide a good dispersion environment and interaction space for the cool feeling nanoparticle modifiers. If the crystallinity is too high, the cool feeling nanoparticle modifiers are easily wrapped by the overgrown crystal regions, resulting in a weakened interaction between them and the polymer matrix, thereby causing the cool feeling function of the cool feeling nanoparticle modifiers to fail. At the same time, it will also reduce the processing fluidity of the cool feeling masterbatch, increasing the difficulty and energy consumption in the subsequent processing and forming process. Therefore, by precisely regulating the crystallinity, the cool feeling performance and processing performance of the cool feeling masterbatch can be effectively balanced, ensuring that the cool feeling masterbatch can exert the best comprehensive effect in practical applications.

[0020] On the basis of the above technical solutions, further, the mass ratio of zinc stearate to maleic anhydride grafted polypropylene is 1:(2 - 4).

[0021] On the basis of the above technical solutions, further, the grafting rate of maleic anhydride grafted polypropylene is 0.8% - 1.2%.

[0022] On the basis of the above technical solutions, further, the mass ratio of pentaerythritol ester to phosphite is (2 - 5):(1 - 3).

[0023] On the basis of the above technical solutions, further, the cool feeling masterbatch includes the following raw materials in parts by weight: the cool feeling nanoparticle modifier is 8 - 12 parts by weight, the dispersant is 1.5 - 3 parts by weight, the heat stabilizer is 0.5 - 0.9 parts by weight, and the cool feeling enhancer is 0.5 - 1.2 parts by weight.

[0024] On the basis of the above technical solutions, further, the cool feeling masterbatch also includes 80 - 88 parts by weight of polypropylene.

[0025] On the basis of the above technical solutions, further, the preparation method includes the following steps: Blending the modified polypropylene, cool feeling masterbatch, antibacterial masterbatch, soft masterbatch, and temperature-lowering masterbatch, forming a fiber web through an air-laying system, and performing hot rolling reinforcement to prepare the soft antibacterial cool feeling non-woven fabric.

[0026] On the basis of the above technical solution, further, plasma treatment, antibacterial agent spraying or ultraviolet irradiation is performed after hot rolling reinforcement.

[0027] Plasma treatment can improve softness, while spraying with antimicrobial agents or irradiating with UV rays can enhance antibacterial properties.

[0028] On the basis of the above technical solution, the soft, antibacterial and cool non-woven fabric further comprises the following raw materials in parts by weight: 80 to 85 parts by weight of the modified polypropylene, 10 to 12 parts by weight of the cool masterbatch, 5 to 8 parts by weight of the antibacterial masterbatch, 1 to 5 parts by weight of the soft masterbatch, and 1 to 5 parts by weight of the cooling masterbatch.

[0029] On the basis of the above technical solution, further, the antibacterial masterbatch contains nano-silver or nitrogen-doped TiO2.

[0030] Modified polypropylene is used as the base material to provide mechanical support for the non-woven fabric, ensuring the stability of the surface structure and preventing deformation and damage. Cooling masterbatch gives non-woven fabrics cooling properties; Antimicrobial masterbatch achieves high antimicrobial efficiency; Softening masterbatch improves the softness and skin-friendliness of non-woven fabrics, reducing the discomfort caused by friction with the skin; Cooling masterbatch reduces spinning temperature, stabilizes the cooling effect, and saves energy.

[0031] On the basis of the above technical solution, further, the modified polypropylene is prepared by melt blending polypropylene, a cooling additive and an antibacterial additive.

[0032] On the basis of the above technical solution, further, the mass ratio of polypropylene, cooling additive and antibacterial additive is (20~50): (1~6): (1~5).

[0033] On the basis of the above technical solution, further, the cooling additives are nano-aluminum oxide and nano-zinc oxide.

[0034] On the basis of the above technical solution, further, the antibacterial additive is nanosilver.

[0035] In a second aspect, the present invention provides a soft, antibacterial, cool non-woven fabric prepared by the above-mentioned preparation method.

[0036] Compared with the prior art, the present invention has the following beneficial effects: The soft, antibacterial, cool non-woven fabric prepared by the present invention simultaneously gives the non-woven fabric an excellent and lasting cool feeling on contact, antibacterial ability, and excellent breathability and comfort, overcoming the difficulty often faced by functional non-woven fabrics in balancing functionality, durability, and comfort. Detailed implementation manners

[0037] Next, in combination with the implementation manners of the present invention, the technical solutions in the implementation manners of the present invention will be clearly and completely described. Obviously, the described implementation manners are only a part of the implementation manners of the present invention, rather than all the implementation manners. Based on the implementation manners in the present invention, all other implementation manners obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] In the following specific implementation, polypropylene is purchased from Sinopec Chemical Sales (Qingdao) Co., Ltd., with a melt index of 25 g / 10 min, 230 °C / 2.16 kg; PLGA is purchased from Changchun Shengbo Ma Biomaterials Co., Ltd., with the product number PLGA50:50, Mw = 15 kDa; Aminopropyltriethoxysilane is purchased from Shanghai Merck Chemical Technology Co., Ltd.; Mint extract is purchased from Xianda Antibacterial Technology Research Institute Co., Ltd., with the product number XA-MINT-PP01 Mint extract 2#; Silica sol is purchased from Shanghai Merck Chemical Technology Co., Ltd., with the product number MKL-S888350-25kg; Antibacterial masterbatch is purchased from Yancheng Ruizhe Color Masterbatch Co., Ltd.; Soft masterbatch is purchased from Yancheng Ruizhe Color Masterbatch Co., Ltd.; Cooling masterbatch is purchased from Yancheng Ruizhe Color Masterbatch Co., Ltd.; Zinc stearate is purchased from Jiangsu Jiujia Biotechnology Co., Ltd.; Maleic anhydride grafted polypropylene is purchased from Shandong Dawn Polymer Materials Co., Ltd.; Pentaerythritol ester and phosphite are purchased from Wuhan Kemike Biopharmaceutical Technology Co., Ltd.; Boron nitride nanosheets are purchased from Shanghai Hanlang New Materials Technology Co., Ltd.; Nanometer alumina is purchased from Yancheng Ruizhe Color Masterbatch Co., Ltd.; Nanometer zinc oxide is purchased from Wuhu Jikang New Materials Technology Co., Ltd.; Nanometer silver is purchased from Beijing Yijin New Materials Technology Co., Ltd.; The twin-screw extruder is purchased from Yancheng Ruizhe Color Masterbatch Co., Ltd., with the model L / D = 40.

[0039] Example 1 This example provides a soft antibacterial and cool-sensing non-woven fabric, which is made of the following raw materials in parts by weight: 82 parts of modified polypropylene, 10 parts of cool-sensing masterbatch, 6 parts of antibacterial masterbatch, 2 parts of soft masterbatch, and 3 parts of cooling masterbatch.

[0040] In this embodiment, the preparation method of the soft antibacterial and cool-sensation non-woven fabric comprises the following steps: I. Preparation of materials Mix the raw materials evenly according to the above weight parts to obtain a mixed material; 1. The preparation method of the cool-sensation masterbatch comprises the following steps: (1) Preparation of the cool-sensation nanoparticle modifier Comprising the following raw materials in weight parts: Table 1 Main raw materials of the cool-sensation nanoparticle modifier

[0041] S1. Pretreatment Dissolution: Dissolve 80 g of PLGA and 16 g of mint extract in 180 g of ethyl acetate, add an APTES ethanol solution with a mass fraction of 1% of APTES (containing 1 g of APTES), and stir at 37 °C for 1 h to complete surface amination to form a uniform oil phase.

[0042] S2. Emulsification Primary emulsion: Drop the oil phase obtained in step S1 into a saturated ethyl acetate aqueous phase containing 10 g of Tween 80 at a rate of 0.5 mL / min, and form a primary emulsion by stirring at a constant temperature using a microfluidic high-pressure homogenizer.

[0043] Multiple emulsion: Inject the primary emulsion into 180 g of silica sol after passing through a microfluidic homogenizer (100 Mpa, 3 cycles) to form a W / O / W multiple emulsion.

[0044] S3. Volatilization Rotate and evaporate at 30 °C until the residual ethyl acetate ≤ 1%, then gradually reduce the pressure to 50 mbar, and simultaneously introduce nitrogen at 80 °C (flow rate 2 L / min) and maintain for 2 h. Control the curing end point by on-line monitoring of the particle size change to form nanoparticles.

[0045] S4. Collection and purification Use ultracentrifugation to separate free drugs and unencapsulated PLGA, and use ultrafiltration purification to remove residual solvents and surfactants to obtain a cool-sensation nanoparticle modifier with an encapsulation rate > 95% (determined by HPLC method, the menthol standard curve R² > 0.999).

[0046] (2) Melt granulation Comprising 880 g of polypropylene (melt index 25 g / 10 min, 230 °C / 2.16 kg), 80 g of the cool-sensation nanoparticle modifier, 10 g of zinc stearate, 20 g of maleic anhydride grafted PP, 3 g of pentaerythritol ester, 2 g of phosphite, and 5 g of boron nitride nanosheets.

[0047] Add the above-mentioned cool-sensation nanoparticle modifier and other raw materials into a twin-screw extruder, and set the temperatures of each zone: the feeding zone is 160 °C, the melting zone is 180 °C, the mixing zone is 195 °C, and the die head zone is 185 °C.

[0048] The screw rotation speed is 300 rpm, and the residence time is 90 s.

[0049] (3)Post-treatment Underwater pelletizing: During the pelletizing process, the temperature of the pelletizing water is strictly controlled at 25 ± 1 °C, the pelletizing speed is 800 rpm, and regular pellets with a diameter of 2 mm × length of 3 mm are obtained; Heat treatment: Place the pellets obtained after underwater pelletizing in an environment of 100 °C for heat treatment for 1 hour, and control the crystallinity at 40 - 45% to obtain the cool-sensation masterbatch.

[0050] 2. Preparation of modified polypropylene Add polypropylene, nano-aluminum oxide, nano-zinc oxide, and nano-silver into a twin-screw extruder according to a mass ratio of 30:2:1:4, and set the temperature gradient of each zone: the feeding zone is 180 °C, the melting zone is 200 °C, the mixing zone is 210 °C, the die head zone is 200 °C, the screw rotation speed is 300 rpm, and the residence time is 90 s.

[0051] After cooling and pelletizing, modified polypropylene is obtained.

[0052] II. Blending and forming Put the said mixture into the feed trough according to the said weight parts, feed it into the spinning main machine, carry out blending treatment according to the preset blending ratio, blending speed, time and other parameters, form a fiber web through the air-laying system, and carry out hot rolling reinforcement through a hot rolling machine to obtain non-woven fabric.

[0053] The process parameters of the blending treatment are as follows: the spinning temperature is 200 °C, and the cooling air temperature is 18 °C; The draw ratio is 3.5 (first stage) × 1.8 (second stage); The hot rolling temperature is 150 °C.

[0054] III. Subsequent treatment Carry out plasma treatment and ultraviolet irradiation on the obtained non-woven fabric to obtain a soft, cool-sensation and antibacterial non-woven fabric.

[0055] Example 2 This example provides a soft, antibacterial and cool-sensation non-woven fabric, which is different from Example 1 in that it is made of the following raw materials in weight parts: 80 parts of modified polypropylene, 11 parts of cool-sensation masterbatch, 5 parts of antibacterial masterbatch, 1 part of soft masterbatch, and 1 part of temperature-lowering masterbatch.

[0056] The preparation method of the cool-sensation masterbatch includes the following steps: (1) Preparation of cool-sensation nanoparticle modifier The raw materials include the following parts by weight: Table 2 Main raw materials of the cool-sensation nanoparticle modifier

[0057] S1. Pretreatment Dissolution: Dissolve 90 g of PLGA and 10 g of mint extract in 220 g of ethyl acetate, add an APTES ethanol solution with a mass fraction of 3% of APTEs (containing 3 g of APTEs), and stir at 37 °C for 1 h to complete surface amination to form a homogeneous oil phase.

[0058] S2. Emulsification Primary emulsion: Drop the oil phase obtained in step S1 into a saturated ethyl acetate aqueous phase containing 20 g of Tween 80 at a rate of 0.5 mL / min, and use a microfluidic high-pressure homogenizer to stir at a constant temperature to form a primary emulsion.

[0059] Multiple emulsion: Inject the primary emulsion into 220 g of silica sol through a microfluidic homogenizer (100 Mpa, 3 cycles) to form a W / O / W multiple emulsion.

[0060] (2) Melt granulation It includes 800 g of polypropylene (melt index 25 g / 10 min, 230 °C / 2.16 kg), 120 g of the cool-sensation nanoparticle modifier, 5 g of zinc stearate, 15 g of maleic anhydride grafted polypropylene, 4 g of pentaerythritol ester, 2 g of phosphite, and 12 g of boron nitride nanosheets.

[0061] Add the above cool-sensation nanoparticle modifier and other raw materials into a twin-screw extruder, and set the temperature of each zone: feeding zone 155 °C, melting zone 190 °C, mixing zone 200 °C, die head zone 190 °C.

[0062] The screw speed is 250 rpm, and the residence time is 60 s.

[0063] Example 3 This example provides a soft antibacterial cool-sensation non-woven fabric, which is different from Example 1 in that it is made of the following parts by weight of raw materials: 85 parts of modified polypropylene, 12 parts of cool-sensation masterbatch, 8 parts of antibacterial masterbatch, 5 parts of soft masterbatch, and 5 parts of cooling masterbatch.

[0064] The preparation method of the cool-sensation masterbatch includes the following steps: (1) Preparation of cool-sensation nanoparticle modifier The raw materials include the following parts by weight: Table 3 Main raw materials of the cool-sensation nanoparticle modifier

[0065] S1. Pretreatment Dissolution: Dissolve 85 g of PLGA and 10 g of mint extract in 200 g of ethyl acetate, add an ethanol solution of APTES with a mass fraction of 2% of APTEs (containing 2 g of APTES), and stir at 37 °C for 1 h to complete surface amination to form a homogeneous oil phase.

[0066] S2. Emulsification Primary emulsion: Drop the oil phase obtained in step S1 into a saturated ethyl acetate aqueous phase containing 15 g of Tween 80 at a rate of 0.5 mL / min, and form a primary emulsion by constant-temperature stirring using a microfluidic high-pressure homogenizer.

[0067] Multiple emulsion: The primary emulsion is injected into 200 g of silica sol after passing through a microfluidic homogenizer (100 Mpa, 3 cycles) to form a W / O / W multiple emulsion.

[0068] (2) Melt granulation It includes 805 g of polypropylene (melt index 25 g / 10 min, 230 °C / 2.16 kg), 100 g of cool-sensation nanoparticle modifier, 5 g of zinc stearate, 10 g of maleic anhydride grafted PP, 6 g of pentaerythritol ester, 3 g of phosphite, and 12 g of boron nitride nanosheets.

[0069] Add the above cool-sensation nanoparticle modifier and other raw materials to a twin-screw extruder, and set the temperatures of each zone: the feeding zone is 150 °C, the melting zone is 185 °C, the mixing zone is 197 °C, and the die head zone is 186 °C.

[0070] The screw speed is 270 rpm, and the residence time is 70 s.

[0071] Comparative example 1 This comparative example provides a soft antibacterial cool-sensation non-woven fabric, and the difference from Example 1 is that it does not contain a cool-sensation nanoparticle modifier.

[0072] Comparative example 2 This comparative example provides a soft antibacterial cool-sensation non-woven fabric, and the difference from Example 1 is that it does not contain PLGA, amino-silane coupling agent, and silica sol.

[0073] Comparative example 3 This comparative example provides a soft antibacterial cool-sensation non-woven fabric, and the difference from Example 1 is that, while keeping the other components unchanged, the weight fraction of PLGA is adjusted to 20 parts (200 g).

[0074] Comparative example 4 This comparative example provides a soft antibacterial and cool-sensation non-woven fabric, which is different from Example 1 in that: while keeping the other components unchanged, the weight portion of the mint extract is adjusted to 20 portions (200 g).

[0075] Comparative Example 5 This comparative example provides a soft antibacterial and cool-sensation non-woven fabric, which is different from Example 1 in that: while keeping the other components unchanged, the weight portion of aminopropyltriethoxysilane is adjusted to 10 portions (100 g).

[0076] Comparative Example 6 This comparative example provides a soft antibacterial and cool-sensation non-woven fabric, which is different from Example 1 in that: while keeping the other components unchanged, the weight portion of the silica sol is adjusted to 40 portions (400 g).

[0077] Comparative Example 7 This comparative example provides a soft antibacterial and cool-sensation non-woven fabric, which is different from Example 1 in that: (2) Melt granulation The weight portion of the cool-sensation nanoparticle modifier is 20 portions (200 g).

[0078] Comparative Example 8 This comparative example provides a soft antibacterial and cool-sensation non-woven fabric, which is different from Example 1 in that: (2) Melt granulation The weight portion of the cool-sensation nanoparticle modifier is 2 portions (20 g).

[0079] Comparative Example 9 This comparative example provides a soft antibacterial and cool-sensation non-woven fabric, which is different from Example 1 in that: the spinning temperature is 250 °C.

[0080] Comparative Example 10 This comparative example provides a soft antibacterial and cool-sensation non-woven fabric, which is different from Example 1 in that: the above cool-sensation nanoparticle modifier and other raw materials are added to a twin-screw extruder, and the temperatures of each zone are set as follows: the temperatures of the feeding zone, the melting zone, the mixing zone and the die head zone are all 250 °C.

[0081] Comparative Example 11 This comparative example provides a soft antibacterial and cool-sensation non-woven fabric, which is different from Example 1 in that: the above cool-sensation nanoparticle modifier and other raw materials are added to a twin-screw extruder, and the temperatures of each zone are set as follows: the temperatures of the feeding zone, the melting zone, the mixing zone and the die head zone are all 190 °C.

[0082] Performance detection Test Examples 1-3 and Comparative Examples 1-11 were used to test the soft antibacterial and cool-sensation non-woven fabrics prepared according to the standards of GB / T 5453-1997 "Determination of Air Permeability of Textiles Fabrics", GB / T 10297-2015 "Hot Wire Method for Determination of Thermal Conductivity of Non-Metallic Solid Materials", GB / T 35263-2017 "Detection and Evaluation of Instantaneous Cool-Sensation Performance of Textiles", and GB 15979-2002 "Hygiene Requirements for Disposable Sanitary Products" for thermal conductivity, cool-sensation value, antibacterial rate, air permeability, and cool-sensation retention rate after five washes. The results are shown in the following table: Table 4 Performance Test Results of Examples and Comparative Examples

[0083] From the above performance test results, it can be seen that the soft antibacterial and cool-sensation non-woven fabrics prepared in Examples 1-3 showed excellent performance in terms of thermal conductivity, cool-sensation value, antibacterial rate, air permeability, and cool-sensation retention rate after five washes, meeting or exceeding the standard requirements, demonstrating the effectiveness and superiority of the technology of the present invention.

[0084] In Comparative Examples 1-11, due to the lack or adjustment of key components, ratios, or process parameters, the performance indicators were significantly lower than those in the examples, verifying the key influence of the cool-sensation masterbatch containing the cool-sensation nanoparticle modifier component and its preparation process on the product performance.

[0085] The cool-sensation masterbatch containing the cool-sensation nanoparticle modifier component is the key factor for improving the cool-sensation, antibacterial, and air permeability of non-woven fabrics. By optimizing its component ratio and preparation process, the present invention has successfully solved the problem of balancing the cool-sensation, softness, and antibacterial performance of functional non-woven fabrics, showing significant technological progress and market application potential.

[0086] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A preparation method of a soft antibacterial and cool-sensation non-woven fabric, characterized in that, It includes the following steps: Dissolve PLGA and mint extract in an organic solvent, add an amino-silane coupling agent to form an oil phase; Inject the said oil phase into an aqueous phase containing a surfactant to form a primary emulsion; Disperse the said primary emulsion in a silica sol to form a multiple emulsion, remove the organic solvent and free impurities to obtain a modified cool-sensation nanoparticle.

2. The preparation method of a soft antibacterial and cool-sensation non-woven fabric according to claim 1, characterized in that The modified cool-sensation nanoparticle includes raw materials in the following weight parts: the weight part of the PLGA is 8-9 parts, the weight part of the mint extract is 1-2 parts, the weight part of the amino-silane coupling agent is 0.1-0.3 parts, and the weight part of the silica sol is 18-22 parts.

3. The preparation method of a soft antibacterial and cool-sensation non-woven fabric according to claim 1, characterized in that, The amino-silane coupling agent includes aminopropyltriethoxysilane.

4. The preparation method of a soft antibacterial and cool-sensation non-woven fabric according to claim 1, characterized in that, It also includes the following steps: Mix the said modified cool-sensation nanoparticle with a dispersant, a heat stabilizer, a cool-sensation enhancer and polypropylene, then carry out melt granulation, underwater pelletizing and heat treatment, and obtain a cool-sensation masterbatch after cooling; Among them, the conditions for the melt granulation are: the feeding zone is 155°C - 160°C, the melting zone is 180°C - 190°C, the mixing zone is 195°C - 200°C, and the die head zone is 185 - 190°C; The dispersant is a mixture after mixing zinc stearate and maleic anhydride grafted polypropylene; The heat stabilizer is a mixture after mixing pentaerythritol ester and phosphite; The cool-sensation enhancer is boron nitride nanosheets.

5. The preparation method of a soft antibacterial and cool-sensation non-woven fabric according to claim 4, characterized in that, The cool-sensation masterbatch includes raw materials in the following weight parts: the weight part of the modified cool-sensation nanoparticle is 8-12 parts, the weight part of the dispersant is 1.5-3 parts, the weight part of the heat stabilizer is 0.5-0.9 parts, and the weight part of the cool-sensation enhancer is 0.5-1.2 parts.

6. The preparation method of a soft antibacterial and cool-sensation non-woven fabric according to claim 4, characterized in that, It includes the following steps: Carry out blending treatment on modified polypropylene, the cool-sensation masterbatch, the antibacterial masterbatch, the softening masterbatch and the cooling masterbatch, form a fiber web through an air-laying system, and carry out hot rolling reinforcement to prepare a soft, antibacterial and cool-sensation non-woven fabric.

7. The preparation method of a soft antibacterial and cool-sensation non-woven fabric according to claim 6, characterized in that, The soft, antibacterial and cool-sensation non-woven fabric includes raw materials in the following weight parts: the weight part of the modified polypropylene is 80-85 parts, the weight part of the cool-sensation masterbatch is 10-12 parts, the weight part of the antibacterial masterbatch is 5-8 parts, the weight part of the softening masterbatch is 1-5 parts, and the weight part of the cooling masterbatch is 1-5 parts.

8. The preparation method of a soft antibacterial and cool-sensation non-woven fabric according to claim 6, wherein, The modified polypropylene is prepared by melt blending of polypropylene, a cool-sensation additive and an antibacterial additive.

9. A soft, antibacterial and cool-sensation non-woven fabric prepared by using the preparation method of a soft, antibacterial and cool-sensation non-woven fabric according to any one of claims 1-8.

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