Soft and comfortable waistline nonwoven fabric and method for manufacturing the same

Abstract

The application discloses a soft and comfortable waist circumference non-woven fabric and a preparation method thereof, and belongs to the technical field of non-woven fabrics.The method comprises the following steps: firstly, fine denier fibers are prepared by melt spinning of polypropylene, POE elastomer, a dispersing agent and a nucleating agent; then, the fibers are laid into a three-layer net structure, wherein the middle layer of the fiber net is subjected to unique pretreatment, phase change material is emulsified in a sodium alginate solution, and a calcium chloride solution is sprayed to realize in-situ cross-linking and solidification, so that a stable phase change microcapsule layer is formed on the surface of the fibers; finally, the non-woven fabric is prepared through a low-temperature hot rolling compounding process and a hot air blowing process.Compared with the prior art, the waist circumference non-woven fabric obtained by the application has the functions of active heat management and long-term stability while maintaining excellent softness and air permeability, and can significantly improve wearing comfort.

Description

Technical Field

[0001] This invention relates to the field of nonwoven fabric technology, and in particular to a soft and comfortable waistband nonwoven fabric and its preparation method. Background Technology

[0002] In the field of disposable hygiene products, the comfort of nonwoven waistband fabrics primarily relies on the softness and breathability of the material. Existing technologies typically improve these properties by optimizing fiber fineness, adding elastomers, or employing multi-layer structural designs. For example, multi-layer spunbond or SMS structures are widely used to balance softness and strength, while the application of various softening masterbatches and hydrophilic finishing agents aims to directly improve the feel and moisture wicking speed. However, these methods largely focus on passively improving physical properties and have limited effectiveness in addressing the core comfort concern of stuffiness caused by the accumulation of body heat and environmental heat.

[0003] To improve the various properties of nonwoven fabrics, existing technologies have proposed several solutions with different focuses. For example, patent CN115538039A mainly focuses on improving the feel by introducing components such as short-chain silicon compounds, which effectively improves the fluffiness and softness of nonwoven fabrics, but its technical solution does not involve temperature regulation. Patent CN117026516A uses a composite of three layers of fiber webs with different ratios, supplemented by post-processing, to impart a certain degree of hydrophilicity to the material while ensuring softness and fluffiness; however, its function remains relatively limited. Patent CN118895575A focuses on significantly improving the mechanical strength of polypropylene fibers through specific nucleating agent compounding, targeting the engineering field as its main market, with insufficient consideration for the comfort of direct contact with the skin.

[0004] In summary, existing technologies have significant shortcomings. They either focus on single properties such as softness and hydrophilicity or concentrate on enhancing mechanical strength, but none of them endow nonwoven fabrics with active and intelligent temperature regulation capabilities. The various technical solutions are functionally limited and cannot meet the market's urgent demand for multifunctional, integrated high-end hygiene materials. Therefore, there is an urgent need in this field for an innovative solution that can, while maintaining the inherent softness and breathability of nonwoven fabrics, integrate efficient and long-lasting thermal comfort management functions, thereby fundamentally improving the wearing experience. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention aims to provide a soft and comfortable nonwoven waistband fabric and its preparation method.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0007] The following is a method for preparing a soft and comfortable nonwoven fabric for waistbands:

[0008] Step 1, spinning: Polypropylene, ethylene-octene copolymer elastomer, dispersant and nucleating agent are mixed and stirred to form a premix, which is then melt-extruded, filtered and spun to obtain fiber filaments;

[0009] Step 2, Nonwoven fabric preparation: The fiber filaments prepared in Step 1 are laid into a three-layer structure: the upper layer is a fine denier fiber web, the middle layer is a fiber web that has been pretreated, and the lower layer is a support layer; the three layers of fiber web are composited under low temperature and high pressure and blown apart to finally obtain the waistband nonwoven fabric.

[0010] The pretreatment method for the intermediate fiber web is as follows:

[0011] S1. Heat water and add sodium alginate while stirring to obtain sodium alginate solution; maintain the temperature and add phase change material, graphite powder and Tween 80 to the solution, shear emulsify to form a stable composite emulsion, and keep it warm for later use.

[0012] S2. First, spray the calcium chloride aqueous solution onto both sides of the middle fiber mesh, and then spray the composite emulsion prepared in step S1 onto both sides of the middle fiber mesh to obtain the pretreated middle fiber mesh.

[0013] The preparation method of the soft and comfortable waistband nonwoven fabric is as follows:

[0014] Step 1, Spinning: Polypropylene, ethylene-octene copolymer elastomer, dispersant, and nucleating agent are added to an automatic mixing device at a mass ratio of 80-95:5-10:1-2:0.3-0.8. After high-speed stirring for 20-40 minutes, a premix is ​​formed. The premix is ​​then melt-extruded through a twin-screw extruder. The temperatures are controlled as follows: Zone I: 110-130℃; Zone II: 160-180℃; Zone III: 190-210℃; Die temperature: 180-200℃. The spindle speed is 50-150 r / min; after the melt is filtered through a 200-400 mesh filter, it is transported to the spinning box by a metering pump. It is then stretched by airflow through a narrow slit-type drawing device with a drawing channel height of 40-60 mm and a slit width of 0.5-1 mm. The drawing pressure is 0.08-1.2 MPa, the filament speed is 2000-3000 m / min, the cooling air temperature is 10-20℃, and the humidity is 60-70%, resulting in fiber filaments with a single filament fineness of 1-2D.

[0015] Step 2, Nonwoven Fabric Preparation: The fibers prepared in Step 1 are laid into a three-layer structure using an air-jet web forming machine: the upper layer is 10-20 g / m². 2 Fine denier fiber web, middle layer 15-25 g / m 2 The fiber web is pretreated, with the lower layer having a density of 10-20 g / m². 2The supporting layer; the three-layer fiber web is composited under low temperature and high pressure at 120-140℃ and 50-70kPa using a hot rolling mill, with a roll linear speed of 20-40m / min; subsequently, hot air at 70-80℃ is used at 800-1200m... 3 A 1 / min airflow is used to vertically blow the fabric surface for 20-50 seconds to finally obtain the waistband nonwoven fabric.

[0016] The nucleating agent is at least one of talc, adipic acid, benzoic acid, dibenzyl sorbitol, and calcium carbonate whiskers.

[0017] Preferably, the nucleating agent is a compound of dibenzyl sorbitol, talc, and calcium carbonate whiskers in a mass ratio of 2-4:0.5-2:4-6.

[0018] The dispersant is at least one of polypropylene wax, sodium gluconate, hydroxyethylidene diphosphonic acid, polyethylene wax, zinc stearate, calcium stearate, magnesium stearate, polyethylene glycol, sodium polyacrylate, fatty alcohol polyoxyethylene ether, sodium dodecyl sulfonate, and vinyltrimethoxysilane.

[0019] Preferably, the dispersant is a mixture of fatty alcohol polyoxyethylene ether, vinyltrimethoxysilane and polypropylene wax in a mass ratio of 0.3-0.8:0.3-0.8:0.5-2.

[0020] The pretreatment method for the intermediate fiber web is as follows, in parts by weight:

[0021] S1. Heat 90-98 parts of water to 70-80℃, add 0.5-2 parts of sodium alginate while stirring at 200-500 rpm, and continue stirring for 40-80 minutes to obtain a sodium alginate solution; keep the temperature at 70-80℃, add 2-6 parts of phase change material, 0.1-0.5 parts of graphite powder and 0.05-0.2 parts of Tween 80 to the solution, and then transfer the mixture to a high-speed shear emulsifier and shear emulsify at 10000-12000 rpm for 3-8 minutes to form a stable composite emulsion, and keep it at 70-80℃ for later use;

[0022] S2. First, prepare a 4-6 wt% calcium chloride aqueous solution at 20-40 g / m 2 The coating is evenly sprayed onto both sides of the middle fiber mesh, and then the composite emulsion prepared in step S1 is applied at a rate of 8-15 g / m². 2 The coating is evenly sprayed onto both sides of the intermediate fiber mesh for 0.5-5 minutes, with a spraying pressure of 0.2-0.5 MPa, to obtain the pretreated intermediate fiber mesh.

[0023] The phase change material is at least one of n-nonadecane, liquid paraffin, tetradecyl alcohol, methyl palmitate, lauric acid, stearic acid, polyethylene glycol 600, hydrogenated palm kernel oil, and zinc stearate.

[0024] Preferably, the phase change material is composed of n-nonadecane and tetradecyl alcohol in a mass ratio of 4-6:2-5.

[0025] More preferably, the phase change material is composed of n-nonadecane, tetradecyl alcohol, and zinc stearate in a mass ratio of 4-6:2-5:0.3-0.8.

[0026] This invention was designed to address a clear industry pain point: while traditional polypropylene nonwoven waistband fabric is soft, breathability and thermal insulation are inherently contradictory. Under body temperature, it easily accumulates heat and moisture, leading to stuffiness and discomfort. This invention aims to resolve this contradiction. Its core design lies in providing intelligent and proactive thermal regulation capabilities without sacrificing breathability and softness.

[0027] This invention first establishes phase change materials (PCMs) as the core for achieving thermal buffering. However, the primary technical obstacle is how to stably immobilize the liquid PCM within a porous fiber network. Direct impregnation can lead to leakage. Therefore, an in-situ spraying-rapid cross-linking and curing strategy was devised. The PCM is emulsified and dispersed in an aqueous sodium alginate solution. Then, utilizing the instantaneous gelation property of sodium alginate upon encountering calcium ions, a microcapsule network encapsulating the PCM is directly formed on the fiber surface. The innovation of this step lies in combining the microcapsule preparation process with the nonwoven fabric molding process, achieving functional integration and stable material immobilization.

[0028] After addressing the issue of functionality, this invention focuses on optimizing its quality. Single-phase change materials generally suffer from supercooling (difficulty recrystallizing after melting), hindering the rapid cycling of the cooling effect. To address this, this invention employs a molecular-level synergistic design, blending n-nonadecane and tetradecanol in a specific ratio. This is not a simple mixture, but rather utilizes the principle that the two can form a eutectic mixture, thereby obtaining a new phase change system that is closer to body temperature and significantly reduces supercooling. This results in a faster cooling response and greater comfort in the nonwoven fabric.

[0029] To ensure the durability of the aforementioned optimized performance, this invention incorporates a third structural reinforcement design, introducing trace amounts of zinc stearate into the eutectic system. It plays a dual role: firstly, as a highly efficient nucleating agent, it further promotes the crystallization of the eutectic, minimizing supercooling; secondly, its nanoparticles may enhance the cross-linking density of the sodium alginate-calcium gel network, acting like reinforcing steel for the microcapsule, significantly improving the durability of the encapsulation structure and thus ensuring the consistent cooling function throughout the product's entire lifespan.

[0030] Compared with existing technologies, it has the following advantages:

[0031] 1) This invention introduces phase change materials, enabling nonwoven fabrics to possess active thermal management capabilities. When the temperature of the fabric increases upon contact with the skin, the material can efficiently absorb and store heat, generating a continuous cooling sensation; when the ambient temperature decreases, it releases heat, effectively buffering temperature changes, thereby significantly improving the discomfort of traditional products that are prone to feeling stuffy and hot, and bringing a smart and comfortable wearing experience.

[0032] 2) This invention utilizes a unique in-situ reaction molding technology to construct stable microcapsule functional units within a fiber network. This structure securely encapsulates and embeds functional materials within the nonwoven fabric, effectively preventing loss and migration during use, thus ensuring the long-lasting stability of the temperature-regulating function while perfectly preserving the excellent softness and fluffiness of the nonwoven fabric itself.

[0033] 3) This invention cleverly combines the preparation of functional layers with the molding process of nonwoven fabrics, achieving multifunctional composite through simplified steps. A good synergistic effect is generated among the functional components, not only endowing the product with excellent temperature regulation capabilities but also effectively enhancing its structural durability, achieving integrated manufacturing, and balancing efficient production with high performance. Detailed Implementation

[0034] Main source of materials:

[0035] Polypropylene, grade: Moplen HP552R, manufacturer (place of origin): LyondellBasell.

[0036] Ethylene-octene copolymer elastomer, grade: POE 6202, brand: ExxonMobil.

[0037] Polypropylene wax, grade: Licocene PP 6102, brand: Clariant.

[0038] Talc powder, fineness: 400 mesh.

[0039] Calcium carbonate whiskers, mesh size: 600 mesh, aspect ratio: 20-30, temperature resistance: 1360℃.

[0040] Fatty alcohol polyoxyethylene ether, model: EO-9, brand: Wanhua.

[0041] Graphite powder, fixed carbon content ≥80-99%, color: black, flake size 0-0.5mm, crystal particle size: 0.001mm.

[0042] Liquid paraffin, model 7#, Maoming Hongtai Petrochemical Co., Ltd.

[0043] All other raw materials used in the embodiments and comparative examples of this invention are commercially available products.

[0044] Example 1

[0045] The following is a method for preparing a soft and comfortable nonwoven fabric for waistbands:

[0046] Step 1, Spinning: Polypropylene, ethylene-octene copolymer elastomer, dispersant, and nucleating agent are added to an automatic mixing device in a mass ratio of 90:8:1.5:0.5. After 30 minutes of high-speed stirring, a premix is ​​formed. The premix is ​​melt-extruded through a twin-screw extruder, with the temperature controlled at 120℃ in zone I, 170℃ in zone II, and 200℃ in zone III, a die temperature of 190℃, and a screw speed of 100 r / min. After the melt is filtered through a 300-mesh filter, it is transported to the spinning box by a metering pump. It is then stretched by airflow through a narrow slit-type drawing device with a drawing channel height of 50 mm and a slit width of 0.8 mm. The drawing pressure is 0.1 MPa, the filament speed is 3000 m / min, and the cooling air temperature is 15℃ and the humidity is 65%, resulting in a fiber with a single filament fineness of 1.4D.

[0047] Step 2, Nonwoven Fabric Preparation: The fibers prepared in Step 1 are laid into a three-layer structure using an air-jet web forming machine: the top layer is 15g / m². 2 Fine denier fiber web, middle layer 20g / m 2 The fiber web is pretreated, with the lower layer being 15g / m². 2 The supporting layer; the three-layer fiber web is composited under low temperature and high pressure at 135℃ and 60kPa using a hot rolling mill, with a roll linear speed of 30m / min; subsequently, 75℃ hot air is used at 1000m... 3 A 30-second vertical airflow of / min is used to blow air onto the fabric surface to obtain the waistband nonwoven fabric.

[0048] The nucleating agent is a compound of dibenzyl sorbitol, talc, and calcium carbonate whiskers in a mass ratio of 3:1:5.

[0049] The dispersant is composed of fatty alcohol polyoxyethylene ether, vinyltrimethoxysilane and polypropylene wax in a mass ratio of 0.5:0.5:1.

[0050] The pretreatment method for the intermediate fiber web is as follows, in parts by weight:

[0051] S1. Heat 94 parts of water to 75°C, add 1 part of sodium alginate while stirring at 400 rpm, and continue stirring for 60 minutes to obtain a sodium alginate solution; keep the temperature at 75°C, add 4 parts of phase change material, 0.3 parts of graphite powder and 0.1 parts of Tween 80 to the solution, and then transfer the mixture to a high-speed shear emulsifier and shear emulsify at 11,000 rpm for 6 minutes to form a stable composite emulsion, and keep it at 75°C for later use;

[0052] S2. First, prepare a 5wt% calcium chloride aqueous solution at 30g / m 2 The coating is evenly sprayed onto both sides of the middle fiber mesh, and then the composite emulsion prepared in step S1 is applied at a rate of 12 g / m². 2 The coating amount was evenly sprayed onto both sides of the intermediate fiber mesh for 1 minute, with a spraying pressure of 0.3 MPa, to obtain the pretreated intermediate fiber mesh.

[0053] The phase change material is n-nonadecane.

[0054] Example 2

[0055] The preparation method of a soft and comfortable waistband nonwoven fabric is basically the same as that in Example 1, except that the phase change material in the pretreatment method of the middle fiber web is different.

[0056] The phase change material is liquid paraffin.

[0057] Example 3

[0058] The preparation method of a soft and comfortable waistband nonwoven fabric is basically the same as that in Example 1, except that the phase change material in the pretreatment method of the middle fiber web is different.

[0059] The phase change material is tetradecyl alcohol.

[0060] Example 4

[0061] The preparation method of a soft and comfortable waistband nonwoven fabric is basically the same as that in Example 1, except that the phase change material in the pretreatment method of the middle fiber web is different.

[0062] The phase change material is methyl palmitate.

[0063] Example 5

[0064] The preparation method of a soft and comfortable waistband nonwoven fabric is basically the same as that in Example 1, except that the phase change material in the pretreatment method of the middle fiber web is different.

[0065] The phase change material is lauric acid.

[0066] Example 6

[0067] The preparation method of a soft and comfortable waistband nonwoven fabric is basically the same as that in Example 1, except that the phase change material in the pretreatment method of the middle fiber web is different.

[0068] The phase change material is stearic acid.

[0069] Example 7

[0070] The preparation method of a soft and comfortable waistband nonwoven fabric is basically the same as that in Example 1, except that the phase change material in the pretreatment method of the middle fiber web is different.

[0071] The phase change material is polyethylene glycol 600.

[0072] Example 8

[0073] The preparation method of a soft and comfortable waistband nonwoven fabric is basically the same as that in Example 1, except that the phase change material in the pretreatment method of the middle fiber web is different.

[0074] The phase change material is hydrogenated palm kernel oil.

[0075] Example 9

[0076] The preparation method of a soft and comfortable waistband nonwoven fabric is basically the same as that in Example 1, except that the phase change material in the pretreatment method of the middle fiber web is different.

[0077] The phase change material is composed of n-nonadecane and tetradecanol in a mass ratio of 5:3.

[0078] Example 10

[0079] The preparation method of a soft and comfortable waistband nonwoven fabric is basically the same as that in Example 1, except that the phase change material in the pretreatment method of the middle fiber web is different.

[0080] The phase change material is composed of polyethylene glycol 600 and hydrogenated palm kernel oil in a mass ratio of 5:3.

[0081] Example 11

[0082] The preparation method of a soft and comfortable waistband nonwoven fabric is basically the same as that in Example 1, except that the phase change material in the pretreatment method of the middle fiber web is different.

[0083] The phase change material is composed of liquid paraffin and methyl palmitate in a mass ratio of 5:3.

[0084] Example 12

[0085] The preparation method of a soft and comfortable waistband nonwoven fabric is basically the same as that in Example 1, except that the phase change material in the pretreatment method of the middle fiber web is different.

[0086] The phase change material is composed of n-nonadecane, tetradecanol and zinc stearate in a mass ratio of 5:3:0.5.

[0087] Comparative Example 1

[0088] The preparation method of a soft and comfortable waistband nonwoven fabric is basically the same as that in Example 1, except that no phase change material is added in the pretreatment method of the middle fiber web.

[0089] Comparative Example 2

[0090] The preparation method of a soft and comfortable waistband nonwoven fabric is basically the same as that in Example 1, except that the middle layer fiber web is not pretreated.

[0091] Test Example 1

[0092] Phase change performance test:

[0093] Test method: Differential scanning calorimetry (DSC)

[0094] Test standard: Refer to ASTM D3418, "Standard test method for determining the enthalpy and temperature of thermal transition of polymers by differential scanning calorimetry".

[0095] Sample preparation: Take 10 mg of the middle layer of the waistband nonwoven fabric prepared in each example and comparative example. Place the sample in a sample tray. Under a nitrogen atmosphere, heat from -20°C to 80°C at a rate of 10°C / min and record the melting process; then cool from 80°C to -20°C at a rate of 10°C / min and record the crystallization process.

[0096] Each sample was tested at least 3 times to eliminate thermal history, and the data from the second cycle was used for analysis.

[0097] Key measurement parameters:

[0098] Phase transition temperature (Tm): The peak temperature of the melting peak.

[0099] Phase change enthalpy (ΔHm): The area of ​​the melting peak, representing the heat storage capacity per unit mass.

[0100] Crystallization temperature (Tc): The peak temperature of the crystallization peak.

[0101] Supercooling (ΔT): ΔT = Tm - Tc. The smaller the supercooling, the easier the material is to crystallize and the faster the functional recovery. The results are shown in Table 1.

[0102] Table 1

[0103] Experimental protocol Phase transition temperature (Tm / ℃) Crystallization temperature (Tc / ℃) Subcooling (ΔT / ℃) Example 1 32.7 17.9 14.8 Example 2 44.8 30.4 14.4 Example 3 38.3 21.6 16.7 Example 4 29.2 16.1 13.1 Example 5 43.7 24.8 18.9 Example 6 55.6 40.3 15.3 Example 7 18.6 -9.8 28.4 Example 8 34.9 22.3 12.6 Example 9 34.9 28.7 6.2 Example 10 18.9 and 34.5 (double peaks) -8.5 and 21.8 27.4 (Main Peak) Example 11 39.8 25.6 14.2 Example 12 35.1 31.2 3.9 Comparative Example 1 No peak No peak not applicable Comparative Example 2 No peak No peak not applicable

[0104] Some mixed phase change materials (such as in Example 10) may exhibit multiple phase change peaks due to factors such as component compatibility, while mixtures that are compounded in a specific ratio to form a eutectic system (such as in Examples 9 and 12) exhibit a single, optimized phase change peak.

[0105] Test Example 2

[0106] Cyclic stability test:

[0107] This result demonstrates the ability to maintain stable temperature regulation even after multiple heating and cooling cycles. This directly impacts product lifespan and user experience consistency.

[0108] Test method: Thermal cycling-phase change enthalpy decay rate test

[0109] Test standard: Refer to GB / T 42715-2023 "Test methods for thermal management properties of phase change materials in textiles".

[0110] Take the middle layer of the nonwoven waistband fabric prepared in each example and comparative example, and cut it to the specified size. Place the sample in a high and low temperature alternating test chamber. Cycle between 10°C and 50°C, maintain the endpoint temperature for 30 minutes, and the heating / cooling rate is 5°C / min. Simulate the alternation of hot and cold in daily use.

[0111] After 100 cycles, the samples were taken out and their phase transition enthalpy (ΔHm) was measured according to the DSC method in Test Example 1.

[0112] Key measurement parameter: Phase change enthalpy decay rate. The calculation formula is: Decay rate (%) = [(Initial ΔHm - Post-cycle ΔHm) / Initial ΔHm] × 100%. Test results are shown in Table 2.

[0113] Table 2

[0114] Experimental protocol Phase transition enthalpy decay rate (%) Example 1 12.4 Example 2 25.7 Example 3 15.3 Example 4 18.6 Example 5 22.5 Example 6 16.1 Example 7 45.7 Example 8 28.4 Example 9 8.4 Example 10 43.8 Example 11 24.3 Example 12 3.4 Comparative Example 1 not applicable Comparative Example 2 not applicable

[0115] The improved thermal management performance of the waistband nonwoven fabric described in this invention stems from the unique design and application of phase change materials. Firstly, compared to Comparative Example 1 without added phase change materials and Comparative Example 2 without pretreatment, each embodiment, by introducing phase change materials into the middle fiber web, endows the nonwoven fabric with active temperature regulation capabilities. Among single phase change materials, hydrogenated palm kernel oil, being an oil mixture, exhibits the best overall applicability due to its phase change temperature range being close to the perceived temperature and its relatively low supercooling. However, single materials still have limitations in terms of supercooling and cycle stability. The significant synergistic effect of Example 9 arises from the formation of a uniform eutectic phase after the two materials are compounded in a specific ratio. This eutectic structure not only optimizes the phase change temperature to a more comfortable 34.9°C, but its regular molecular arrangement also significantly reduces the crystallization energy barrier, thereby sharply reducing the supercooling to 6.2°C, significantly improving thermal response speed and reversibility. Furthermore, the introduction of zinc stearate into the eutectic system of Example 9 in Example 12 may be due to the fact that zinc stearate nanoparticles, as a highly efficient heterogeneous nucleating agent, provide abundant crystallization sites for the eutectic, making the crystallization process more rapid and complete, thereby further reducing the supercooling to 3.9°C. At the same time, zinc stearate can also enhance the compactness of the sodium alginate calcium gel network, effectively locking in the phase change material, resulting in an extremely low phase change enthalpy decay rate after 100 thermal cycles, thus improving the long-term effectiveness and stability of the thermal management function.

Claims

1. A method for preparing a soft and comfortable nonwoven fabric for a waistband, characterized in that, The method is as follows: Step 1, spinning: Polypropylene, ethylene-octene copolymer elastomer, dispersant and nucleating agent are mixed and stirred to form a premix, which is then melt-extruded, filtered and spun to obtain fiber filaments; Step 2, Nonwoven fabric preparation: The fiber filaments prepared in Step 1 are laid into a three-layer structure: the upper layer is a fine denier fiber web, the middle layer is a fiber web that has been pretreated, and the lower layer is a support layer; the three layers of fiber web are composited under low temperature and high pressure and blown apart to finally obtain the waistband nonwoven fabric; The pretreatment method for the intermediate fiber web is as follows: S1. Heat water and add sodium alginate while stirring to obtain sodium alginate solution; maintain the temperature and add phase change material, graphite powder and Tween 80 to the solution, shear emulsify to form a stable composite emulsion, and keep it warm for later use. S2. First, spray the calcium chloride aqueous solution onto both sides of the middle fiber mesh, and then spray the composite emulsion prepared in step S1 onto both sides of the middle fiber mesh to obtain the pretreated middle fiber mesh.

2. The method for preparing the soft and comfortable waistband nonwoven fabric as described in claim 1, characterized in that, The method is as follows: Step 1, Spinning: Polypropylene, ethylene-octene copolymer elastomer, dispersant, and nucleating agent are added to an automatic mixing device at a mass ratio of 80-95:5-10:1-2:0.3-0.

8. After high-speed stirring for 20-40 minutes, a premix is ​​formed. The premix is ​​then melt-extruded through a twin-screw extruder. The temperatures are controlled as follows: Zone I: 110-130℃; Zone II: 160-180℃; Zone III: 190-210℃; Die temperature: 180-200℃. The spindle speed is 50-150 r / min; after the melt is filtered through a 200-400 mesh filter, it is transported to the spinning box by a metering pump. It is then stretched by airflow through a narrow slit-type drawing device with a drawing channel height of 40-60 mm and a slit width of 0.5-1 mm. The drawing pressure is 0.08-1.2 MPa, the filament speed is 2000-3000 m / min, the cooling air temperature is 10-20℃, and the humidity is 60-70%, resulting in fiber filaments with a single filament fineness of 1-2D. Step 2, Nonwoven Fabric Preparation: The fibers prepared in Step 1 are laid into a three-layer structure using an air-jet web forming machine: the upper layer is 10-20 g / m². 2 Fine denier fiber web, middle layer 15-25 g / m 2 The fiber web is pretreated, with the lower layer having a density of 10-20 g / m². 2 The supporting layer; the three-layer fiber web is composited under low temperature and high pressure at 120-140℃ and 50-70kPa using a hot rolling mill, with a roll linear speed of 20-40m / min; subsequently, hot air at 70-80℃ is used at 800-1200m... 3 A 1 / min airflow is used to vertically blow the fabric surface for 20-50 seconds to finally obtain the waistband nonwoven fabric.

3. The method for preparing the soft and comfortable waistband nonwoven fabric as described in claim 1 or 2, characterized in that, The nucleating agent is at least one of talc, adipic acid, benzoic acid, dibenzyl sorbitol, and calcium carbonate whiskers.

4. The method for preparing the soft and comfortable waistband nonwoven fabric as described in claim 1 or 2, characterized in that, The dispersant is at least one of polypropylene wax, sodium gluconate, hydroxyethylidene diphosphonic acid, polyethylene wax, zinc stearate, calcium stearate, magnesium stearate, polyethylene glycol, sodium polyacrylate, fatty alcohol polyoxyethylene ether, sodium dodecyl sulfonate, and vinyltrimethoxysilane.

5. The method for preparing the soft and comfortable waistband nonwoven fabric as described in claim 1 or 2, characterized in that, The nucleating agent is composed of dibenzyl sorbitol, talc, and calcium carbonate whiskers in a mass ratio of 2-4:0.5-2:4-6; the dispersant is composed of fatty alcohol polyoxyethylene ether, vinyltrimethoxysilane, and polypropylene wax in a mass ratio of 0.3-0.8:0.3-0.8:0.5-2.

6. The method for preparing the soft and comfortable waistband nonwoven fabric as described in claim 1 or 2, characterized in that, The pretreatment method for the intermediate fiber web is as follows, in parts by weight: S1. Heat 90-98 parts of water to 70-80℃, add 0.5-2 parts of sodium alginate while stirring at 200-500 rpm, and continue stirring for 40-80 minutes to obtain a sodium alginate solution; keep the temperature at 70-80℃, add 2-6 parts of phase change material, 0.1-0.5 parts of graphite powder and 0.05-0.2 parts of Tween 80 to the solution, and then transfer the mixture to a high-speed shear emulsifier and shear emulsify at 10000-12000 rpm for 3-8 minutes to form a stable composite emulsion, and keep it at 70-80℃ for later use; S2. First, prepare a 4-6 wt% calcium chloride aqueous solution at 20-40 g / m 2 The coating is evenly sprayed onto both sides of the middle fiber mesh, and then the composite emulsion prepared in step S1 is applied at a rate of 8-15 g / m². 2 The coating is evenly sprayed onto both sides of the intermediate fiber mesh for 0.5-5 minutes, with a spraying pressure of 0.2-0.5 MPa, to obtain the pretreated intermediate fiber mesh.

7. The method for preparing the soft and comfortable waistband nonwoven fabric as described in claim 1 or 2, characterized in that, The phase change material is at least one of n-nonadecane, liquid paraffin, tetradecyl alcohol, methyl palmitate, lauric acid, stearic acid, polyethylene glycol 600, hydrogenated palm kernel oil, and zinc stearate.

8. The method for preparing the soft and comfortable waistband nonwoven fabric as described in claim 1 or 2, characterized in that, The phase change material is composed of n-nonadecane and tetradecyl alcohol in a mass ratio of 4-6:2-5.

9. The method for preparing the soft and comfortable waistband nonwoven fabric as described in claim 1 or 2, characterized in that, The phase change material is composed of n-nonadecane, tetradecyl alcohol, and zinc stearate in a mass ratio of 4-6:2-5:0.3-0.

8.

10. A soft and comfortable nonwoven fabric for a waistband, characterized in that, It is prepared by the preparation method described in any one of claims 1-9.