A soft, antibacterial, cool non-woven fabric and its preparation method

Abstract

This invention provides a soft, antibacterial, cooling nonwoven fabric and a method for its preparation. The method comprises the following steps: dissolving PLGA and peppermint extract in an organic solvent, adding an aminosilane coupling agent to form an oil phase; injecting the oil phase into an aqueous phase containing a surfactant to form colostrum; dispersing the colostrum in a silica sol to form a double emulsion; and removing the organic solvent and free impurities to obtain the cooling nanoparticle-modified product. The resulting soft, antibacterial, cooling nonwoven fabric offers an excellent and long-lasting cooling sensation, antibacterial properties, and breathable comfort.

Description

Technical Field

[0001] The present invention relates to the technical field of functional nonwoven materials, in particular to a soft, antibacterial, cool nonwoven fabric and a preparation method thereof. Background Art

[0002] Polypropylene (PP) nonwovens, with their advantages of light weight, high strength, and low cost, are widely used in healthcare, personal care, home decoration, and other fields. However, existing PP nonwovens still face numerous technical bottlenecks in synergizing functionality and comfort, hindering their expansion into high-end applications.

[0003] First, in terms of thermal management performance, the thermal conductivity of conventional PP fibers is only about 0.2W / (m・K), which is far lower than the heat dissipation requirement for human skin to feel comfortable. This limitation in heat conduction efficiency makes it difficult for body surface heat to dissipate quickly, especially in high temperature or high humidity environments, which can easily cause a feeling of stuffiness and significantly reduce wearing comfort. Secondly, the timeliness of antibacterial performance is a prominent issue. Although the commonly used organic antibacterial agents have significant initial antibacterial effects, they are prone to loss of antibacterial components due to factors such as migration and volatilization during use, making it difficult to achieve long-term antibacterial effects. Inorganic antibacterial agents are limited by insufficient action sites, and there is a clear threshold for the exertion of their antibacterial activity, which cannot meet the antibacterial needs in long-term use scenarios.

[0004] Furthermore, insufficient functional durability severely impacts product lifespan. For example, using cooling finishes, cooling nonwovens produced using existing processing methods typically retain less than 60% of the cooling finish after five washes. This makes it difficult to maintain stable cooling properties, limiting the product's reusability and market competitiveness.

[0005] Furthermore, improving comfort faces technical challenges. Traditionally, enhancing cooling properties by adding high levels of cooling particles or special coatings often comes at the expense of material softness. Furthermore, employing skin-friendly treatments to enhance the soft touch requires complex surface modification or post-processing, which not only increases production costs but also introduces new quality control challenges. Summary of the Invention

[0006] In view of this, the present invention proposes a soft, antibacterial, cool non-woven fabric and a preparation method thereof, which solves the problem that mint extract is easily decomposed at high temperature and is difficult to melt with polypropylene to prepare non-woven fabric, and the conflicting characteristics of the non-woven fabric in the prior art that it is difficult to achieve a cool feeling, softness, and antibacterial properties at the same time.

[0007] The technical solution of the present invention is achieved as follows:

[0008] In a first aspect, the present invention provides a method for preparing a soft, antibacterial, cool non-woven fabric, comprising the following steps:

[0009] PLGA and mint extract are dissolved in an organic solvent, and an aminosilane coupling agent is added to form an oil phase;

[0010] injecting the oil phase into a water phase containing a surfactant to form colostrum;

[0011] The colostrum is dispersed in silica sol to form a double emulsion, and the organic solvent and free impurities are removed to obtain the cooling nanoparticle modified body.

[0012] Using ethyl acetate as an organic solvent, PLGA and mint extract were dissolved to form an oil phase. Aminopropyltriethoxysilane (APTES) and silica sol were then added. Through interfacial perturbation and solvent evaporation, a cooling nanoparticle modification was formed. APTES acts as an interfacial bridge, forming covalent bonds through a condensation reaction between the amino groups and the carboxyl groups of PLGA, thereby constructing an organic-inorganic transition layer. APTES also provides active sites for silica deposition. The silica's thermal barrier effect creates a three-dimensional network structure through the sol-gel method, resulting in a low thermal expansion coefficient, enabling controlled release of the mint extract while simultaneously preventing thermal degradation.

[0013] On the basis of the above technical solution, the cooling nanoparticle modified body further comprises the following raw materials in parts by weight: 8 to 9 parts by weight of the PLGA, 1 to 2 parts by weight of the mint extract, 0.1 to 0.3 parts by weight of the aminosilane coupling agent, and 18 to 22 parts by weight of the silica sol.

[0014] On the basis of the above technical solution, further, the aminosilane coupling agent is aminopropyltriethoxysilane.

[0015] On the basis of the above technical solution, the following steps are further included:

[0016] The cooling nanoparticle modification is mixed with a dispersant, a heat stabilizer, a cooling enhancer and polypropylene, and then melt granulated, underwater pelletized, heat treated and cooled to obtain the cooling masterbatch;

[0017] The melt granulation conditions are as follows: the temperature of the feeding zone is 155°C to 160°C, the temperature of the melting zone is 180°C to 190°C, the temperature of the mixing zone is 195°C to 200°C, and the temperature of the die zone is 185°C to 190°C.

[0018] The dispersant is a mixture of zinc stearate and maleic anhydride grafted polypropylene;

[0019] The heat stabilizer is a mixture of pentaerythritol ester and phosphite;

[0020] The cooling enhancer is boron nitride nanosheets.

[0021] On the basis of the above technical solution, further, the conditions for the melt granulation also include a screw speed of 250~300 rpm.

[0022] The temperature of the feeding zone is 155℃~160℃, which is lower than the melting point of the polymer substrate (such as PET, PP). This prevents the material from sticking or agglomerating due to local overheating in the screw feeding section, ensuring the stability of solid transportation.

[0023] Cooling masterbatch is sensitive to high temperature. Low temperature feeding can reduce its heat exposure time before entering the melting zone, avoiding degradation or agglomeration of the surface modification layer.

[0024] The temperature of the melting zone is 180℃~190℃, which is 10-20℃ higher than the melting point of the polymer. This ensures that the substrate is fully melted to form a uniform melt, providing a fluid carrier for the subsequent dispersion of the cool nanoparticle modification. It needs to be controlled below the thermal degradation temperature of the polymer to avoid the melt viscosity dropping too fast, causing screw slippage or energy waste.

[0025] The mixing zone temperature is 195°C to 200°C, which reduces melt viscosity and, combined with the high shear action of the twin-screw extruder, promotes uniform dispersion of the nanoparticles within the polymer matrix. This avoids localized overheating, maintaining a temperature slightly higher than the melting zone but lower than the die head. This prevents shear heating from causing excessive melt temperature increases and maintains the dispersion stability of the cooling nanoparticle-modified product.

[0026] The die zone temperature is 185-190°C, slightly lower than the mixing zone (195°C → 185°C). This reduces thermal stress on the melt exiting the die, preventing die buildup and extrusion swell. Controlling the melt viscosity to match underwater pelletizing ensures uniform pellet shape during underwater pelletizing, minimizing the risk of contiguous or broken pellets.

[0027] The temperature gradient from the feeding area to the die area forms a thermal process of "low temperature-melting-high dispersion-stable extrusion", taking into account both the protection of the cool nanoparticle modification and the processing performance of the substrate.

[0028] Low-temperature underwater pelletizing rapidly absorbs heat from the melt during the pelletizing process, allowing the melt to solidify rapidly in a very short time. This solidification process not only effectively fixes the dispersion of the cooling nanoparticle modifiers in the polymer matrix, preventing them from aggregating due to melt flow or physical effects during subsequent processing, but also effectively avoids adhesion between the cooling nanoparticle modifiers due to melt residue or surface viscosity, thereby ensuring that the resulting particles have good dispersion and stability, as well as independent particle morphology.

[0029] In order to further optimize the comprehensive performance of the cooling masterbatch, the crystallinity of the cooling masterbatch obtained after pelletizing was controlled.

[0030] The specific process parameters are: heat treatment of the pellets at 100°C for one hour, followed by slow cooling to room temperature. Through this heat treatment and cooling process, the crystallinity of the masterbatch is precisely controlled within the range of 40-45%.

[0031] Crystallinity is one of the key factors affecting the performance of masterbatch. Its reasonable control is of great significance for optimizing the cooling durability and processing fluidity of cooling masterbatch. When the crystallinity is in the appropriate range of 40-45%, the polymer molecular chains in the cooling masterbatch can form a certain degree of ordered arrangement, giving the cooling masterbatch a certain structural stability and mechanical properties, and can also retain sufficient amorphous areas to provide a good dispersion environment and interaction space for the cooling nanoparticle modification. If the crystallinity is too high, the cooling nanoparticle modification is easily wrapped by the overgrown crystal area, resulting in a weakening of the interaction between it and the polymer matrix, thereby rendering the cooling function of the cooling nanoparticle modification ineffective. At the same time, it will also reduce the processing fluidity of the cooling masterbatch and increase the difficulty and energy consumption in the subsequent processing and molding process. Therefore, by precisely controlling the crystallinity, the cooling performance and processing performance of the cooling masterbatch can be effectively balanced, ensuring that the cooling masterbatch can achieve the best comprehensive effect in practical applications.

[0032] On the basis of the above technical solution, further, the mass ratio of the zinc stearate to the maleic anhydride grafted polypropylene is 1:(2~4).

[0033] On the basis of the above technical solution, further, the grafting rate of maleic anhydride grafted polypropylene is 0.8%~1.2%.

[0034] On the basis of the above technical solution, further, the mass ratio of the pentaerythritol ester to the phosphite is (2-5): (1-3).

[0035] On the basis of the above technical solution, the cooling masterbatch further comprises the following raw materials in parts by weight: 8 to 12 parts by weight of the cooling nanoparticle modification, 1.5 to 3 parts by weight of the dispersant, 0.5 to 0.9 parts by weight of the thermal stabilizer, and 0.5 to 1.2 parts by weight of the cooling enhancer.

[0036] On the basis of the above technical solution, the cooling masterbatch further comprises 80 to 88 parts by weight of polypropylene.

[0037] On the basis of the above technical solution, the preparation method further includes the following steps: blending modified polypropylene, cooling masterbatch, antibacterial masterbatch, softening masterbatch, and cooling masterbatch, forming a fiber web through an air-laid system, and hot-rolling reinforcement to prepare a soft, antibacterial, cooling non-woven fabric.

[0038] On the basis of the above technical solution, further, plasma treatment, antibacterial agent spraying or ultraviolet irradiation is performed after hot rolling reinforcement.

[0039] Plasma treatment can improve softness, while spraying with antimicrobial agents or irradiating with UV rays can enhance antibacterial properties.

[0040] 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.

[0041] On the basis of the above technical solution, further, the antibacterial masterbatch contains nano-silver or nitrogen-doped TiO2.

[0042] 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.

[0043] Cooling masterbatch gives non-woven fabrics cooling properties;

[0044] Antimicrobial masterbatch achieves high antimicrobial efficiency;

[0045] Softening masterbatch improves the softness and skin-friendliness of non-woven fabrics, reducing the discomfort caused by friction with the skin;

[0046] Cooling masterbatch reduces spinning temperature, stabilizes the cooling effect, and saves energy.

[0047] 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.

[0048] 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).

[0049] On the basis of the above technical solution, further, the cooling additives are nano-aluminum oxide and nano-zinc oxide.

[0050] On the basis of the above technical solution, further, the antibacterial additive is nanosilver.

[0051] In a second aspect, the present invention provides a soft, antibacterial, cool non-woven fabric prepared by the above-mentioned preparation method.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] 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 DESCRIPTION

[0054] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0055] In the following specific implementation, polypropylene was purchased from Sinopec Chemical Sales (Qingdao) Co., Ltd. with a melt index of 25 g / 10 min, 230 ° C / 2.16 kg;

[0056] PLGA was purchased from Changchun Shengboma Biomaterial Co., Ltd. with the product number PLGA50:50, Mw = 15 kDa;

[0057] Aminopropyltriethoxysilane was purchased from Shanghai Myril Biochemical Technology Co., Ltd.;

[0058] Peppermint extract was purchased from Xi'anda Antimicrobial Technology Research Institute Co., Ltd., with the product number XA-MINT-PP01 Peppermint Extract 2#;

[0059] Silica sol was purchased from Shanghai Myril Biochemical Technology Co., Ltd., with the product number MKL-S888350-25kg;

[0060] The antimicrobial masterbatch was purchased from Yancheng Ruize Masterbatch Co., Ltd.

[0061] The soft masterbatch was purchased from Yancheng Ruize Masterbatch Co., Ltd.

[0062] The cooling masterbatch was purchased from Yancheng Ruize Masterbatch Co., Ltd.

[0063] Zinc stearate was purchased from Jiangsu Jiujia Biotechnology Co., Ltd.;

[0064] Maleic anhydride grafted polypropylene was purchased from Shandong Dawn Polymer Materials Co., Ltd.;

[0065] Pentaerythritol ester and phosphite were purchased from Wuhan Kemik Biopharmaceutical Technology Co., Ltd.;

[0066] Boron nitride nanosheets were purchased from Shanghai Hanlang New Material Technology Co., Ltd.

[0067] Nano-alumina was purchased from Yancheng Ruize Masterbatch Co., Ltd.

[0068] Nano zinc oxide was purchased from Wuhu Jikang New Material Technology Co., Ltd.

[0069] Nanosilver was purchased from Beijing Yijin New Material Technology Co., Ltd.;

[0070] The twin-screw extruder was purchased from Yancheng Ruize Masterbatch Co., Ltd., with a model of L / D=40.

[0071] Example 1

[0072] This embodiment provides a soft, antibacterial, and cool non-woven fabric, which is made of the following raw materials in parts by weight: 82 parts of modified polypropylene, 10 parts of cool masterbatch, 6 parts of antibacterial masterbatch, 2 parts of soft masterbatch, and 3 parts of cooling masterbatch.

[0073] In this embodiment, the preparation method of the soft, antibacterial, cool non-woven fabric comprises the following steps:

[0074] 1. Prepare ingredients

[0075] The raw materials are uniformly mixed according to the above parts by weight to obtain a mixture;

[0076] 1. The preparation method of the cooling masterbatch comprises the following steps:

[0077] (1) Preparation of cooling nanoparticle modified bodies

[0078] It includes the following raw materials in parts by weight:

[0079] Table 1 Main raw materials of cooling nanoparticle modifications

[0080]

[0081] S1. Preprocessing

[0082] Dissolution: 80 g PLGA and 16 g mint extract were dissolved in 180 g ethyl acetate, and an APTES ethanol solution with a mass fraction of 1% (containing 1 g APTES) was added. The mixture was stirred at 37 °C for 1 h to complete the surface amination and form a uniform oil phase.

[0083] S2. Emulsification

[0084] Colostrum: The oil phase obtained in step S1 was added dropwise to a saturated ethyl acetate aqueous phase containing 10 g of Tween 80 at a rate of 0.5 mL / min, and colostrum was formed by constant temperature stirring using a microfluidizer.

[0085] Emulsion: Colostrum was passed through a microfluidizer (100 MPa, 3 cycles) and then injected with 180 g of silica sol to form a W / O / W emulsion.

[0086] S3, Volatility

[0087] Rotary evaporation was performed at 30°C until the residual ethyl acetate was ≤1%. The pressure was then gradually reduced to 50 mbar, and nitrogen at 80°C (flow rate 2 L / min) was introduced simultaneously for 2 h. The curing endpoint was controlled by online monitoring of the particle size change to form nanoparticles.

[0088] S4. Collection and purification

[0089] Free drug and unencapsulated PLGA were separated by ultracentrifugation, and residual solvent and surfactant were removed by ultrafiltration to obtain cooling nanoparticle modifications with an encapsulation efficiency of >95% (determined by HPLC, R² of the menthol standard curve >0.999).

[0090] (2) Melt granulation

[0091] The invention comprises 880g polypropylene (melt index 25g / 10min, 230℃ / 2.16kg), 80g cooling nanoparticle modification body, 10g zinc stearate, 20g maleic anhydride grafted PP, 3g pentaerythritol ester, 2g phosphite, and 5g boron nitride nanosheets.

[0092] The above-mentioned cooling nanoparticle modification product and other raw materials were added into a twin-screw extruder, and the temperature of each zone was set as follows: 160°C for the feeding zone, 180°C for the melting zone, 195°C for the mixing zone, and 185°C for the die zone.

[0093] The screw speed was 300 rpm and the residence time was 90 s.

[0094] (3) Post-processing

[0095] Underwater pelletizing: During the pelletizing process, the pelletizing water temperature is strictly controlled at 25±1°C, the pelletizing speed is 800 rpm, and regular pellets with a diameter of 2 mm and a length of 3 mm are obtained;

[0096] Heat treatment: The pellets obtained after underwater pelletizing are placed in an environment of 100°C for heat treatment for 1 hour, and the crystallinity is controlled to 40-45% to obtain a cooling masterbatch.

[0097] 2. Preparation of modified polypropylene

[0098] Polypropylene, nano-alumina, nano-zinc oxide, and nano-silver were added into a twin-screw extruder in a mass ratio of 30:2:1:4. The temperature gradient of each zone was set as follows: 180°C in the feeding zone, 200°C in the melting zone, 210°C in the mixing zone, and 200°C in the die zone. The screw speed was 300 rpm, and the residence time was 90 s.

[0099] After cooling and pelletizing, modified polypropylene is obtained.

[0100] 2. Blending and molding

[0101] The mixed material is put into the material trough according to the said weight proportions, fed into the spinning main machine, and blended according to the preset blending ratio, blending speed and time parameters. The fiber web is formed by the air-laid system, and is hot-rolled and reinforced by a hot rolling mill to obtain a non-woven fabric.

[0102] The process parameters of the blending treatment are as follows: spinning temperature is 200 °C, cooling air temperature is 18 °C;

[0103] The draft ratio is 3.5 (first level) × 1.8 (second level);

[0104] The hot rolling temperature is 150°C.

[0105] 3. Subsequent Processing

[0106] The obtained nonwoven fabric was subjected to plasma treatment and ultraviolet irradiation to obtain a soft and cool antibacterial nonwoven fabric.

[0107] Example 2

[0108] This embodiment provides a soft, antibacterial, and cool non-woven fabric, which differs from Example 1 in that it is made of the following raw materials in parts by weight: 80 parts of modified polypropylene, 11 parts of cool masterbatch, 5 parts of antibacterial masterbatch, 1 part of soft masterbatch, and 1 part of cooling masterbatch.

[0109] The preparation method of the cooling masterbatch comprises the following steps:

[0110] (1) Preparation of cooling nanoparticle modified bodies

[0111] The raw materials include the following parts by weight:

[0112] Table 2 Main raw materials of cooling nanoparticle modifications

[0113]

[0114] S1. Preprocessing

[0115] Dissolution: 90 g PLGA and 10 g peppermint extract were dissolved in 220 g ethyl acetate, and an APTES ethanol solution with a mass fraction of 3% APTEs (containing 3 g APTEs) was added. The mixture was stirred at 37 °C for 1 h to complete the surface amination and form a uniform oil phase.

[0116] S2. Emulsification

[0117] Colostrum: The oil phase obtained in step S1 was added dropwise to a saturated ethyl acetate aqueous phase containing 20 g of Tween 80 at a rate of 0.5 mL / min, and colostrum was formed by constant temperature stirring using a microfluidizer.

[0118] Emulsion: Colostrum was passed through a microfluidizer (100 MPa, 3 cycles) and then injected with 220 g of silica sol to form a W / O / W emulsion.

[0119] (2) Melt granulation

[0120] The invention comprises 800g polypropylene (melt index 25g / 10min, 230℃ / 2.16kg), 120g cooling nanoparticle modified body, 5g zinc stearate, 15g maleic anhydride grafted polypropylene, 4g pentaerythritol ester, 2g phosphite, and 12g boron nitride nanosheets.

[0121] The above-mentioned cooling nanoparticle modification and other raw materials were added into a twin-screw extruder, and the temperature of each zone was set as follows: 155°C for the feeding zone, 190°C for the melting zone, 200°C for the mixing zone, and 190°C for the die zone.

[0122] The screw speed was 250 rpm and the residence time was 60 s.

[0123] Example 3

[0124] This embodiment provides a soft, antibacterial, and cool non-woven fabric, which differs from Example 1 in that it is made of the following raw materials in parts by weight: 85 parts of modified polypropylene, 12 parts of cool masterbatch, 8 parts of antibacterial masterbatch, 5 parts of soft masterbatch, and 5 parts of cooling masterbatch.

[0125] The preparation method of the cooling masterbatch comprises the following steps:

[0126] (1) Preparation of cooling nanoparticle modified bodies

[0127] The raw materials include the following parts by weight:

[0128] Table 3 Main raw materials of cooling nanoparticle modifications

[0129]

[0130] S1. Preprocessing

[0131] Dissolution: 85 g PLGA and 10 g peppermint extract were dissolved in 200 g ethyl acetate, and an APTES ethanol solution with a mass fraction of 2% (containing 2 g APTES) was added. The mixture was stirred at 37 °C for 1 h to complete the surface amination and form a uniform oil phase.

[0132] S2. Emulsification

[0133] Colostrum: The oil phase obtained in step S1 was added dropwise to a saturated ethyl acetate aqueous phase containing 15 g of Tween 80 at a rate of 0.5 mL / min, and colostrum was formed by constant temperature stirring using a microfluidizer.

[0134] Emulsion: Colostrum was passed through a microfluidizer (100 MPa, 3 cycles) and then injected with 200 g of silica sol to form a W / O / W emulsion.

[0135] (2) Melt granulation

[0136] The invention comprises 805 g of polypropylene (melt index 25 g / 10 min, 230° C. / 2.16 kg), 100 g of a cooling nanoparticle modified body, 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.

[0137] The above-mentioned cooling nanoparticle modification and other raw materials were added into a twin-screw extruder, and the temperature of each zone was set as follows: 150°C for the feeding zone, 185°C for the melting zone, 197°C for the mixing zone, and 186°C for the die zone.

[0138] The screw speed was 270 rpm and the residence time was 70 s.

[0139] Comparative Example 1

[0140] This comparative example provides a soft, antibacterial, cool-feeling nonwoven fabric, which differs from Example 1 in that it does not contain a cool-feeling nanoparticle modification.

[0141] Comparative Example 2

[0142] This comparative example provides a soft, antibacterial, cool-feeling non-woven fabric, which differs from Example 1 in that it does not contain PLGA, aminosilane coupling agent, and silica sol.

[0143] Comparative Example 3

[0144] This comparative example provides a soft, antibacterial, cool non-woven fabric, which differs from Example 1 in that: while keeping the other components unchanged, the weight of PLGA is adjusted to 20 parts (200 g).

[0145] Comparative Example 4

[0146] This comparative example provides a soft, antibacterial, cool non-woven fabric, which differs from Example 1 in that the weight of the peppermint extract is adjusted to 20 parts (200 g) while keeping the other components unchanged.

[0147] Comparative Example 5

[0148] This comparative example provides a soft, antibacterial, cool non-woven fabric. The difference from Example 1 is that while keeping the other components unchanged, the weight of aminopropyltriethoxysilane is adjusted to 10 parts (100 g).

[0149] Comparative Example 6

[0150] This comparative example provides a soft, antibacterial, cool non-woven fabric. The difference from Example 1 is that the weight of the silica sol is adjusted to 40 parts (400 g) while keeping the other components unchanged.

[0151] Comparative Example 7

[0152] This comparative example provides a soft, antibacterial, cool nonwoven fabric, which differs from Example 1 in that:

[0153] (2) Melt granulation

[0154] The weight portion of the cooling nanoparticle modification is 20 parts (200 g).

[0155] Comparative Example 8

[0156] This comparative example provides a soft, antibacterial, cool nonwoven fabric, which differs from Example 1 in that:

[0157] (2) Melt granulation

[0158] The weight portion of the cooling nanoparticle modification is 2 parts (20 g).

[0159] Comparative Example 9

[0160] This comparative example provides a soft, antibacterial, cool non-woven fabric, which differs from Example 1 in that the spinning temperature is 250°C.

[0161] Comparative Example 10

[0162] This comparative example provides a soft, antibacterial, cool non-woven fabric. The difference from Example 1 is that the above-mentioned cool nanoparticle modification and other raw materials are added to a twin-screw extruder, and the temperature of each zone is set: the temperature of the feeding zone, melting zone, mixing zone and die zone is 250°C.

[0163] Comparative Example 11

[0164] This comparative example provides a soft, antibacterial, cool non-woven fabric. The difference from Example 1 is that the above-mentioned cool nanoparticle modification and other raw materials are added to a twin-screw extruder, and the temperature of each zone is set: the temperature of the feeding zone, melting zone, mixing zone and die zone is all 190°C.

[0165] Performance testing

[0166] The soft, antibacterial, and cool non-woven fabrics prepared in Test Examples 1-3 and Comparative Examples 1-11 were tested for thermal conductivity, coolness, antibacterial rate, air permeability, and coolness retention after five washes according to GB / T 5453-1997 "Determination of Air Permeability of Textile Fabrics", GB / T 10297-2015 "Determination of Thermal Conductivity of Non-metallic Solid Materials - Hot Wire Method", GB / T 35263-2017 "Test and Evaluation of Cooling Properties of Textiles at Contact Instantaneous Temperatures", and GB15979-2002 "Hygienic Requirements for Disposable Sanitary Products". The results are shown in the following table:

[0167] Table 4 Performance test results of the examples and comparative examples

[0168]

[0169] From the above performance test results, it can be seen that the soft, antibacterial, cool non-woven fabrics prepared in Examples 1-3 have excellent performance in thermal conductivity, cool value, antibacterial rate, air permeability and cool retention rate after five washes, meeting or exceeding the standard requirements, demonstrating the effectiveness and superiority of the technology of the present invention.

[0170] Due to the lack or adjustment of key ingredients, proportions or process parameters, the performance indicators of Comparative Examples 1-11 are significantly lower than those of the embodiments, which verifies the key influence of the cooling masterbatch containing the cooling nanoparticle modified body component and its preparation process on the product performance.

[0171] Cooling masterbatches containing cooling nanoparticle modifiers are key to improving the cooling, antimicrobial, and breathable properties of nonwoven fabrics. By optimizing the ingredient ratios and preparation process, this invention successfully addresses the challenge of achieving a balanced cooling, soft, and antimicrobial performance in functional nonwoven fabrics, demonstrating significant technological advancement and market potential.

[0172] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for preparing a soft, antibacterial, cool non-woven fabric, characterized in that: The following steps are involved: PLGA and mint extract are dissolved in an organic solvent, and an aminosilane coupling agent is added to form an oil phase; injecting the oil phase into a water phase containing a surfactant to form colostrum; Dispersing the colostrum in silica sol to form a double emulsion, removing the organic solvent and free impurities to obtain a cooling nanoparticle modified body; The following steps are also included: The cooling nanoparticle modification is mixed with a dispersant, a heat stabilizer, a cooling enhancer and polypropylene, and then melt granulated, underwater pelletized, heat treated and cooled to obtain a cooling masterbatch; The melt granulation conditions are as follows: the feeding zone is 155°C to 160°C, the melting zone is 180°C to 190°C, the mixing zone is 195°C to 200°C, and the die zone is 185°C to 190°C. The dispersant is a mixture of zinc stearate and maleic anhydride grafted polypropylene; The heat stabilizer is a mixture of pentaerythritol ester and phosphite; The cooling enhancer is boron nitride nanosheets; The method comprises the following steps: blending modified polypropylene, cooling masterbatch, antibacterial masterbatch, softening masterbatch and cooling masterbatch, forming a fiber web through an air-laid system, and hot-rolling and reinforcing the web to prepare a soft, antibacterial and cooling non-woven fabric; The modified polypropylene is prepared by melt blending polypropylene, a cooling additive and an antibacterial additive.

2. The method for preparing a soft, antibacterial, cool nonwoven fabric according to claim 1, wherein: The cooling nanoparticle modification comprises the following raw materials in parts by weight: 8 to 9 parts by weight of PLGA, 1 to 2 parts by weight of mint extract, 0.1 to 0.3 parts by weight of aminosilane coupling agent, and 18 to 22 parts by weight of silica sol.

3. The method for preparing a soft, antibacterial, cool nonwoven fabric according to claim 1, wherein: The aminosilane coupling agent includes aminopropyltriethoxysilane.

4. The method for preparing a soft, antibacterial, cool nonwoven fabric according to claim 1, wherein: The cooling masterbatch comprises the following raw materials in parts by weight: 8 to 12 parts by weight of the cooling nanoparticle modification, 1.5 to 3 parts by weight of the dispersant, 0.5 to 0.9 parts by weight of the heat stabilizer, and 0.5 to 1.2 parts by weight of the cooling enhancer.

5. The method for preparing a soft, antibacterial, cool nonwoven fabric according to claim 1, wherein: The soft, antibacterial, and cool non-woven fabric comprises the following raw materials in parts by weight: 80-85 parts by weight of the modified polypropylene, 10-12 parts by weight of the cool masterbatch, 5-8 parts by weight of the antibacterial masterbatch, 1-5 parts by weight of the soft masterbatch, and 1-5 parts by weight of the cooling masterbatch.

6. A soft, antibacterial, cool non-woven fabric prepared by the method for preparing a soft, antibacterial, cool non-woven fabric as claimed in any one of claims 1 to 5.

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