Preparation method of non-woven wool felt based on embedding of dynamic elastic fiber net

Abstract

The invention relates to the technical field of high-performance materials, and particularly discloses a preparation method of a non-woven wool felt based on embedding of a dynamic elastic fiber net. A preparation method of a non-woven wool felt based on embedding of a dynamic elastic fiber net comprises the following steps that the dynamic elastic fiber net and wool felt base materials are stacked and laid, a layer of dynamic elastic fiber net is laid between the two layers of wool felt base materials, and the fiber net and the base materials are tightly fused in a central area through a hot pressing technology; and further fixing the edge area by using a light gradient needling process, and gradually reducing the density outwards to low density by using high-density needling in the edge combination area of the dynamic elastic fiber net and the wool felt, so as to obtain the non-woven wool felt based on embedding of the dynamic elastic fiber net. The prepared non-woven wool felt has good mechanical properties, keeps good balance of air permeability and flexibility, and can be applied to various application scenes such as outdoor clothes, shoes and boots, automobile interiors and the like.

Description

Technical Field

[0001] The present application relates to the technical field of high performance materials, and more specifically, it relates to a method for preparing a non-woven wool felt based on the embedding of a dynamic elastic fiber web. Background Art

[0002] In the field of high-performance materials, with the continuous improvement of requirements for mechanical properties, thermal stability and sustainability of materials, non-woven wool felt, as an important type of material, has become a research hotspot for performance improvement and technological innovation. However, traditional non-woven wool felt has some inherent challenges in structure and manufacturing, which limits its wide application. Due to the relatively loose arrangement of fibers, traditional non-woven wool felt is prone to deformation or even rupture when subjected to external force, and cannot meet the strict requirements of high-performance applications for material strength and stability. In order to improve the performance of non-woven wool felt, researchers have tried to use complex manufacturing technologies such as multi-layer or sandwich structures, but on the one hand, these technologies not only increase the complexity and cost of the manufacturing process, but may also lead to low production efficiency. In addition, complex manufacturing processes may also introduce additional quality control issues, further increasing the difficulty and uncertainty of material preparation. At the same time, multi-layer sandwich technology is prone to slippage between layers, affecting the performance of the material.

[0003] Therefore, it is necessary to provide a method for preparing high-performance non-woven wool felt that can solve the inherent defects of traditional non-woven wool felt and meet the higher requirements of high-performance applications on materials. Summary of the invention

[0004] In order to improve the mechanical properties of non-woven wool felt, the present application provides a preparation method of non-woven wool felt based on the embedding of dynamic elastic fiber mesh.

[0005] In a first aspect, the present application provides a dynamic elastic fiber mesh, which adopts the following technical solution: A dynamic elastic fiber net comprises the following preparation steps: (1) adding thermoplastic elastic fiber to a solvent and reacting at 60-70° C. for 2-4 hours to fully dissolve the fiber, adjusting the viscosity to 500-2000 cp to obtain a polymer solution, wherein the mass concentration of the polymer solution is 12-20%; (2) adding a nano-enhanced material to the above polymer solution, and ultrasonically dispersing it at 20-40 kHz for 30-60 minutes to obtain a nano-enhanced polymer solution, wherein the amount of the nano-enhanced material added accounts for 1-5% of the mass of the polymer solution; (3) The nano-enhanced polymer solution is heated to 180-250° C. and ejected at a speed of 50-200 m / min to form a fiber. A high-speed airflow of 100-150 m / s is used to refine the fibers. The fibers are collected in a cooling device and then cooled to room temperature to form a fiber web. After drying and curing, a dynamic elastic fiber web is formed.

[0006] By adopting the above technical solution, the nano-reinforced material can form tiny channels in the fiber that are conducive to the passage of gas. Its low-density characteristics reduce the weight of the fiber mesh, so that the dynamic elastic fiber mesh has both good tensile properties and air permeability. In the preparation process, the stability and uniformity of the polymer solution are effectively ensured by precisely controlling the dissolution conditions and viscosity of the thermoplastic elastic fiber in the solvent. Subsequently, the introduction of the nano-reinforced material and ultrasonic dispersion not only significantly improve the dispersion uniformity of the material in the polymer, but also enhance the mechanical properties of the fiber through interfacial interactions. During the spinning process, the polymer solution at high temperature is ejected at an appropriate speed, and the high-speed airflow is used to refine the fibers, ensuring the uniformity and fineness of the fibers. Finally, the cooling and curing step stabilizes the fiber mesh structure, forming a dynamic elastic fiber mesh with excellent dynamic elasticity, high strength and good uniformity.

[0007] Optionally, the nano-reinforced material is subjected to silanization modification, and epoxy silane is used to modify the surface of the nano-filler, and the modification operation includes the following steps: The nano-reinforced material is mixed with water and an alcohol solvent, and an appropriate amount of epoxy silane is added and stirred, and then heated to 60-80° C., and stirred for 2-3 hours, and then filtered, washed, and dried to obtain the modified nano-reinforced material. The weight ratio of the nano-reinforced material to water, ethanol, and epoxy silane is 5-10:70-90:10-30:0.1.

[0008] By adopting the above technical solution, the silane group of epoxy silane reacts with the silanol group on the surface of the nanofiller to form a stable Si-O-Si chemical bond, which improves the surface activity of the nanofiller. At the same time, the nanofiller after silanization has better compatibility with the polymer matrix, reduces interface defects, and enhances the mechanical properties of the composite material. Through silanization treatment, epoxy silane enhances the dispersion stability of the nanofiller and improves the interface bonding force between the nanofiller and the polymer matrix, thereby improving the overall performance of the composite material.

[0009] Optionally, the nano-reinforced material is obtained by mixing nano-silicon dioxide and carbon nanotubes in a weight ratio of 2-3:1.

[0010] By adopting the above technical solution, silica and carbon nanotubes are mixed in a ratio of 2-3:1. The different properties of the two materials complement each other. Silica provides hardness and wear resistance, and carbon nanotubes improve the fiber's tear resistance and thermal stability by dispersing stress and conducting heat. The two materials work together to improve the overall performance of the fiber web. The combined effect makes the composite material have better mechanical properties and thermal stability, meeting the needs of high-strength and high-temperature applications.

[0011] Optionally, the thermoplastic elastic fiber is any one of polyurethane, spandex and polyester fiber; The thickness of the dynamic elastic fiber net is 0.5-2 mm.

[0012] In a second aspect, the present application provides a method for preparing a non-woven wool felt embedded with a dynamic elastic fiber web, using the following technical solution: A method for preparing a non-woven wool felt based on the embedding of a dynamic elastic fiber net comprises the following steps: The dynamic elastic fiber net and the wool felt substrate are stacked and laid, and a layer of dynamic elastic fiber net is laid between the two layers of wool felt substrate. The fiber net and the substrate are tightly integrated in the central area by a hot pressing process, and the hot pressing temperature is controlled at 50-80°C, the pressure is 3-10MPa, and the hot pressing time is 5-10 seconds; the edge area is further fixed by a light gradient needle punching process, and high-density needle punching is used in the edge bonding area of ​​the dynamic elastic fiber net and the wool felt, and the density is gradually reduced to low outwards to obtain a non-woven wool felt based on the dynamic elastic fiber net embedding; The central area is located at the geometric center of the wool felt, and its area accounts for 80%±5% of the area of ​​the wool felt, and is a circular or rectangular area; the edge area is 20%±5% of the area of ​​the wool felt, forming a ring or frame area around the central area.

[0013] By adopting the above technical scheme, the elastic fiber mesh is embedded in the wool felt by hot pressing, the friction between the layers is enhanced to form a strong bonding area that is tightly combined together, and in order to maintain flexibility and ductility, the edge area is fixed by needle punching, and the fiber mesh and the wool felt are further fixed by friction and embedding to avoid interlayer slippage. Further, a light gradient needle punching is used to form a flexible bonding area to avoid excessive hardening between layers, ensuring the optimal combination of overall flexibility and strength of the material. This composite material increases the elasticity and dynamic response performance while maintaining the original characteristics of the wool felt, thereby broadening the scope of application.

[0014] Optionally, during the mild gradient acupuncture, the needle penetration depth is 5-10 mm, and the acupuncture density is 50-100 needles / cm 2 .

[0015] By adopting the above technical solution, the range of needle penetration depth and needle density in the light gradient needling process is clarified. The appropriate needle penetration depth and density can ensure the effective interweaving and bonding between fibers to form a stable structure. At the same time, the light gradient needling process can also reduce the risk of material damage and fiber breakage, maintaining the integrity and performance of the material.

[0016] Optionally, during the mild gradient needling process, the needling depth gradually increases from the edge to the edge of the heat-pressed bonding zone, and the change in needling depth is determined by the following formula: Among them, d (x) is the needle penetration depth at a distance x from the edge; d min The minimum puncture depth is 5 mm, located at the edge; d max The maximum needling depth is 10 mm, located at the edge of the hot-pressed bonding area; L is the total distance from edge to edge of the thermal compression bonding area.

[0017] Optionally, during the mild gradient needling process, the needling density gradually increases from the edge to the edge of the hot pressing bonding area, and the change in needling density is determined by the following formula: Among them, n (x) is the needle density (needles / cm 2 ); n min The minimum needle density is 50 needles / cm at the edge. 2 ; n max The maximum needle density is 100 needles / cm at the edge of the hot pressing bonding area. 2 ; L is the total distance from edge to edge of the thermal compression bonding area.

[0018] By adopting the above technical solution, the needling depth and density increase linearly with the position, ensuring a smooth transition from the edge area to the hot pressing area, avoiding stress concentration and material damage caused by sudden changes, and gradually changing to achieve uniform bonding between layers, improving the overall performance and durability of the material. The high needling density and deep needling depth near the hot pressing bonding area ensure that the fiber structure is tightly bonded, enhancing the strength of the wool felt, and slowly transitioning to form an intermediate gradient layer. The needling density gradually decreases, and the needling depth decreases until a flexible bonding area is formed in the edge area, where the needling density is the lowest and the needling depth is the shallowest, retaining the flexibility and elasticity of the fiber.

[0019] Optionally, the wool felt has a thickness of 5-10 mm.

[0020] In summary, this application has the following beneficial effects: 1. Due to the addition of dynamic elastic fiber mesh reinforcement and the application of partitioning and combining processes, wool felt products with good performance in all aspects are obtained. This patented product is superior to traditional wool felt and similar products on the market in terms of core quality control indicators of wool felt, especially while maintaining good mechanical properties, while better balancing air permeability and flexibility. The technical innovation of this patent significantly improves the effectiveness of the product, and is suitable for a variety of application scenarios such as outdoor clothing, shoes and boots, and automotive interiors.

[0021] 2. The acupuncture process in this application is not full-layer acupuncture, but partitioned gradient acupuncture, which aims to optimize the mechanical properties and flexibility of the overall material through differentiated treatment of different areas. This design not only improves the strength and durability of the material, but also retains the necessary flexibility and breathability, meeting the needs of high-performance applications.

[0022] 3. The elastic fiber mesh prepared by meltblowing in this application can be directly embedded in wool felt without the need for additional adhesives or complex multi-layer structures, thereby reducing the number of process steps. By combining heat pressing and light needling, different bonding strengths are used in different areas, avoiding the complexity and resource consumption caused by full needling or full heat pressing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of laying the wool felt substrate and the dynamic elastic fiber provided by the present application; Figure 2 This is a diagram of the internal structure of wool felt formed by gradient needle punching. DETAILED DESCRIPTION

[0024] The present application is further described in detail below with reference to the embodiments.

[0025] If the specific conditions are not specified in the examples, the experiments were carried out under conventional conditions or conditions recommended by the manufacturer. If the manufacturers of the reagents or instruments are not specified, they are all conventional products that can be purchased commercially.

[0026] Polyurethane was purchased from Yongzhou Jiaming Plastic Co., Ltd., item number: 3685AU; carbon nanotubes were purchased from Core Nano (Guangdong) Co., Ltd., model DZ-899, fineness 5-15nm; nano-silicon dioxide was purchased from Shenzhen Jingcai Chemical Co., Ltd., model JC-SI30, particle size 30±5nm.

[0027] Preparation examples of raw materials and / or intermediates Preparation Example 1 A modified nano-enhanced material, the preparation of which comprises the following steps: Take 10 kg of nano-silica and add it to a mixed solution of 100 kg of water and ethanol in a weight ratio of 70:30, stir and disperse it, add 0.1 kg of γ-glycidyloxypropyltrimethoxysilane (epoxy silane) and stir and mix well, heat to 70 ° C, continue stirring for 2.5 hours and then filter, wash with deionized water to remove unreacted silane chemical reagents, and dry the cleaned filler at 70 ° C for 5 hours to ensure that the surface is completely dry to remove solvents and moisture to obtain a modified nano-reinforced material.

[0028] Preparation Example 2 A modified nano-enhanced material, the preparation of which comprises the following steps: Take 8 kg of nano-silica and add it to a mixed solution of 100 kg of water and ethanol in a weight ratio of 80:20, stir and disperse it, add 0.1 kg of γ-glycidyloxypropyltrimethoxysilane (epoxy silane) and stir and mix well, heat to 80 ° C, continue stirring for 2 hours and then filter, wash with deionized water to remove unreacted silane chemical reagents, and dry the cleaned filler at 80 ° C for 4 hours to ensure that the surface is completely dry, remove the solvent and moisture, and obtain a modified nano-reinforced material.

[0029] Preparation Example 3 A modified nano-enhanced material, the preparation of which comprises the following steps: Take 5 kg of nano-silica and add it to a mixed solution of 100 kg of water and ethanol in a weight ratio of 90:10, stir and disperse it, add 0.1 kg of γ-glycidyloxypropyltrimethoxysilane (epoxy silane) and stir and mix well, heat to 60 ° C, continue stirring for 3 hours and then filter, wash with deionized water to remove unreacted silane chemical reagents, and dry the cleaned filler at 60 ° C for 6 hours to ensure that the surface is completely dry, remove the solvent and moisture, and obtain a modified nano-reinforced material.

[0030] Preparation Example 4 A modified nano-reinforced material is different from Preparation Example 1 in that in this Preparation Example, an equal amount of nano-reinforced material obtained by mixing nano-silicon dioxide and carbon nanotubes in a weight ratio of 3:1 is used to replace nano-silicon dioxide, that is, 7.5 kg of silicon dioxide and 2.5 kg of carbon nanotubes are added. Example

[0031] Example 1 A non-woven wool felt based on dynamic elastic fiber web embedding, the preparation of which comprises the following steps: (1) 16 kg of polyurethane was added to dimethylacetamide (solvent) and reacted at 65° C. for 3 h to fully dissolve, and the viscosity was adjusted to 1500 cp to obtain a polymer solution, wherein the mass concentration of the polymer solution was 16%; (2) adding the modified nano-reinforced material prepared in Preparation Example 1 to the above polymer solution, and ultrasonically dispersing at 30 kHz for 40 min, pausing every 10 min to prevent overheating, to obtain a nano-reinforced polymer solution; the amount of the nano-reinforced material added is 2.5% by mass of the polymer solution; (3) The nano-enhanced polymer solution was heated to 215°C and ejected at a speed of 125 m / min. The fibers were thinned to 5 μm using a high-speed airflow of 125 m / s. The fibers were collected in a cooling device and then cooled to room temperature to form a fiber web. The solvent was removed by hot air drying at 100°C for 3 h. The fibers were then cured at 150°C for 30 min to form a fiber web with a thickness of 1 mm and a weight of 200 g / m 2 Dynamic elastic fiber network; (4) The prepared dynamic elastic fiber mesh was embedded in a 8 mm thick, 200 g / m 2 In the TANWOOL felt, the dynamic elastic fiber net and the TANWOOL felt are laid in layers, and a layer of dynamic elastic fiber net is laid between the two layers of TANWOOL felt (see the schematic diagram Figure 1 ), the central area (circular, 90 cm in diameter, accounting for 81% of the total area) was hot pressed, the temperature during the hot pressing process was 65 ° C, the pressure was 6.5 MPa, and the hot pressing time was 7 seconds; the edge area (annular, 5 cm in width, accounting for 19% of the total area) was further fixed using a light gradient needle punching process (see the internal structure formed by needle punching for details) Figure 2 ), using high-density needle punching at the edge bonding area of ​​the dynamic elastic fiber net and the wool felt to gradually decrease to low density outwards, to obtain; During the mild gradient needling process, the needling depth is set in the equipment control system to gradually increase from 5 mm at the edge to 10 mm in the center, and the needling density is set from 50 needles / cm at the edge to 100 needles / cm at the center. 2 Gradually increase to 100 stitches / cm in the center 2 The acupuncture depth change is determined by the following formula (1): The acupuncture density is determined by the following formula (2):

[0032] Example 2 A non-woven wool felt based on dynamic elastic fiber web embedding, the preparation of which comprises the following steps: (1) 20 kg of polyurethane was added to dimethylacetamide (solvent) at 60° C. for 4 h to fully dissolve, and the viscosity was adjusted to 2000 cp to obtain a polymer solution, wherein the mass concentration of the polymer solution was 20%; (2) adding the modified nano-reinforced material prepared in Preparation Example 2 to the above polymer solution, and ultrasonically dispersing at 40 kHz for 30 min, pausing every 10 min to prevent overheating, to obtain a nano-reinforced polymer solution; the amount of the nano-reinforced material added is 5% of the polymer solution; (3) The nano-enhanced polymer solution was heated to 250°C and spun at a speed of 50 m / min. The fibers were thinned to 3 μm using a high-speed airflow of 150 m / s. The fibers were collected in a cooling device and cooled to room temperature to form a fiber web. The solvent was removed by hot air drying at 100°C for 3 h. The fibers were then cured at 150°C for 30 min to form a fiber web with a thickness of 2 mm and a weight of 200 g / m 2 Dynamic elastic fiber network; (4) The prepared dynamic elastic fiber net is embedded in 8 mm thick TANWOOL felt, the dynamic elastic fiber net and the TANWOOL felt are stacked and laid, a layer of dynamic elastic fiber net is laid between the two TANWOOL felts, and the central area (circular, 90 cm in diameter, accounting for 81% of the total area) is hot-pressed, the temperature during the hot-pressing process is 80° C., the pressure is 3 MPa, and the hot-pressing time is 5 seconds; the edge area (annular, 5 cm in width, accounting for 19% of the total area) is further fixed by a light gradient needle punching process, and the edge bonding area of ​​the dynamic elastic fiber net and the wool felt is needled with high density and gradually reduced to low density outward, to obtain; During the mild gradient needling process, the needling depth is set in the equipment control system to gradually increase from 5 mm at the edge to 10 mm in the center, and the needling density is set from 50 needles / cm at the edge to 100 needles / cm at the center. 2 Gradually increase to 100 stitches / cm in the center 2 The acupuncture density and acupuncture depth are controlled the same as in Example 1.

[0033] Example 3 A non-woven wool felt based on dynamic elastic fiber web embedding, the preparation of which comprises the following steps: (1) 12 kg of polyurethane was added to dimethylacetamide (solvent) and reacted at 60-70° C. for 2-4 hours to fully dissolve, and the viscosity was adjusted to 500 cp to obtain a polymer solution, wherein the mass concentration of the polymer solution was 12%; (2) adding the modified nano-reinforced material prepared in Preparation Example 3 to the above polymer solution, and ultrasonically dispersing at 20 kHz for 60 min, pausing every 15 min to prevent overheating, to obtain a nano-reinforced polymer solution; the amount of the nano-reinforced material added is 1% of the polymer solution; (3) The nano-enhanced polymer solution was heated to 180°C and ejected at a speed of 200 m / min. The fibers were thinned to 4 μm using a high-speed airflow of 100 m / s. The fibers were collected in a cooling device and then cooled to room temperature to form a fiber web. The solvent was removed by hot air drying at 100°C for 3 h. The fibers were then cured at 150°C for 30 min to form a fiber web with a thickness of 0.5 mm and a weight of 200 g / m 2 Dynamic elastic fiber network; (4) The prepared dynamic elastic fiber net is embedded in 8 mm thick TANWOOL felt, the dynamic elastic fiber net and the TANWOOL felt are stacked and laid, and a layer of dynamic elastic fiber net is laid between the two layers of TANWOOL felt, and the central area (circular, 90 cm in diameter, accounting for 81% of the total area) is hot-pressed, and the temperature during the hot-pressing process is 50° C., the pressure is 10 MPa, and the hot-pressing time is 5 seconds; the edge area (annular, 5 cm in width, accounting for 19% of the total area) is further fixed by a light gradient needle punching process, and the edge bonding area of ​​the dynamic elastic fiber net and the wool felt is needled with high density and gradually reduced to low density outward, to obtain; During the mild gradient needling process, the needling depth is set in the equipment control system to gradually increase from 5 mm at the edge to 10 mm in the center, and the needling density is set from 50 needles / cm at the edge to 100 needles / cm at the center. 2 Gradually increase to 100 stitches / cm in the center 2 The acupuncture density and acupuncture depth are controlled the same as in Example 1.

[0034] Example 4 A non-woven wool felt based on embedded dynamic elastic fiber mesh, which is different from Example 1 in that the nano-reinforced material prepared in Preparation Example 4 is used in this example.

[0035] Comparative Example Comparative Example 1 A non-woven wool felt based on dynamic elastic fiber mesh embedding, which is different from Example 1 in that no nano-reinforcement material is added in this comparative example, and specifically comprises the following steps: (1) 16 kg of polyurethane was added to dimethylacetamide (solvent) and reacted at 65° C. for 3 h to fully dissolve, and the viscosity was adjusted to 1500 cp to obtain a polymer solution, wherein the mass concentration of the polymer solution was 16%; (3) The polymer solution is heated to 215°C and spun out at a speed of 125 m / min. The fibers are refined using a high-speed airflow of 125 m / s. The fibers are collected in a cooling device and then cooled to room temperature to form a fiber web. The solvent is removed by hot air drying at 100°C for 3 hours. The fibers are then cured at 150°C for 30 minutes to form a dynamic elastic fiber web with a thickness of 1 mm. The remaining steps are the same as in Example 1.

[0036] Comparative Example 2 A non-woven wool felt based on embedded dynamic elastic fiber net, which is different from Example 1 in that a nano-reinforcement material that is not modified by silanization is added in this comparative example.

[0037] Comparative Example 3 A non-woven wool felt based on the embedding of a dynamic elastic fiber net, which is different from Example 1 in the following aspects: (1) Same as Example 1; (2) The dynamic elastic fiber net prepared in Preparation Example 1 was embedded in a 8 mm thick TANWOOL felt. The dynamic elastic fiber net and the TANWOOL felt were stacked and laid. A layer of dynamic elastic fiber net was laid between the two layers of TANWOOL felt. The center and edge areas were not distinguished. The entire surface was evenly hot-pressed. During the hot-pressing process, the temperature was 65° C., the pressure was 6.5 MPa, and the hot-pressing time was 7 seconds. The needle-punching depth was 7 mm, and the needle-punching density was 75 needles / cm 2 .

[0038] Comparative Example 4 A non-woven wool felt based on the embedding of a dynamic elastic fiber net, which is different from Example 1 in the following aspects: (1) Same as Example 1; (2) The dynamic elastic fiber mesh prepared in Preparation Example 1 was embedded in 8 mm thick TANWOOL felt. The dynamic elastic fiber mesh and the TANWOOL felt were stacked and laid, with a layer of dynamic elastic fiber mesh laid between the two layers of TANWOOL felt. The entire surface was evenly hot-pressed and bonded. During the hot-pressing process, the temperature was 65° C., the pressure was 6.5 MPa, and the hot-pressing time was 7 seconds.

[0039] Comparative Example 5 A non-woven wool felt based on the embedding of a dynamic elastic fiber net, which is different from Example 1 in the following aspects: (1) Same as Example 1; (2) The dynamic elastic fiber net prepared in Preparation Example 1 was embedded in a 8 mm thick TANWOOL felt. The dynamic elastic fiber net and the TANWOOL felt were stacked and laid, with a layer of dynamic elastic fiber net laid between the two layers of TANWOOL felt. The needles were set to a puncture depth of 7 mm and a puncture density of 75 needles / cm. 2 acupuncture.

[0040] Comparative Example 6 The utility model relates to a non-woven wool felt, which is obtained by gluing and compounding alcohol glue purchased from the market as an adhesive.

[0041] Performance testing Detection method / test method Tensile properties: The tensile strength of the wool felt is tested using a tensile testing machine according to the method described in GB / T 1040.3-2006; Tear strength: The tear strength of the wool felt is tested using a tear tester in accordance with GB / T 24218.4-2010; Thermal stability: The thermal stability of the material is measured by thermogravimetric analysis (TGA) in accordance with GB / T 2406.2-2009; Air permeability: The air permeability of the wool felt is tested using an air permeability tester in accordance with GB / T 5453-1997; Flexibility: The bending radius of the wool felt is tested using a flexibility tester in accordance with GB / T 20312-2006. The smaller the bending radius, the better the flexibility.

[0042] Table 1 Test results Combining Examples 1-3 and Comparative Example 1 and Table 1, it can be seen that the experimental data of Examples 1-3 are better than those of Comparative Example 1, indicating that the addition of nano-reinforced materials significantly improves the tensile properties and thermal stability of the materials. Further combining the experimental data of Examples 1 and 4, it can be seen that when the nano-reinforced material mixed with nano-silicon dioxide and carbon nanotubes in a ratio of 3:1 is added, the performance of the non-woven wool felt is further improved, and the synergistic effect of nano-silicon dioxide and carbon nanotubes further improves the tensile strength and thermal stability of the material.

[0043] Combining Examples 1-3 and Comparative Example 2 and Table 2, it can be seen that the test data of Examples 1-3 are better than those of Comparative Example 2, indicating that the further silanization surface treatment of the nano-reinforced material improves the dispersibility of the nano-reinforced material in the polymer matrix, reduces the agglomeration phenomenon, and makes the fiber web performance more uniform and stable.

[0044] Combining Examples 1-3 and Comparative Example 3 and Table 2, it can be seen that the test data of Examples 1-3 are better than those of Comparative Example 3. Comparative Example 3 did not use a partitioning combination process, but used hot pressing combined with uniform needling for reinforcement. Repeated hot pressing and needling caused the air permeability and bending performance of the wool felt to decrease greatly. Excessive rigidity also increased the difficulty of subsequent processing and reduced tensile strength.

[0045] Combining Examples 1-3 and Comparative Example 4 with Table 2, it can be seen that the various test data of Examples 1-3 are better than those of Comparative Example 4. Comparative Examples 4-6 respectively use hot pressing, needle punching and gluing to form composite wool felt, and the performance of these methods is lower than the partition bonding process in the embodiment. This shows that the partition bonding process has significant advantages in improving material performance, avoiding the increase in rigidity caused by single heat bonding or full needle punching, maintaining the balance between mechanical properties and flexibility, comfort and air permeability, and making the performance of the material more uniform and stable.

[0046] By combining elastic fiber mesh reinforcement and partition bonding process, this patented product is superior to traditional wool felt and similar products on the market in terms of core quality control indicators of wool felt, especially in terms of mechanical properties, while maintaining a good balance between air permeability and flexibility. The technical innovation of this patent significantly improves the effectiveness of the product and is suitable for a variety of application scenarios such as outdoor clothing, shoes and boots, and automotive interiors.

[0047] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A dynamic elastic fiber net, characterized in that: The preparation comprises the following steps: (1) adding thermoplastic elastic fiber to a solvent and reacting at 60-70° C. for 2-4 hours to fully dissolve the fiber, adjusting the viscosity to 500-2000 cp to obtain a polymer solution, wherein the mass concentration of the polymer solution is 12-20%; (2) adding a nano-enhanced material to the above polymer solution, and ultrasonically dispersing it at 20-40 kHz for 30-60 minutes to obtain a nano-enhanced polymer solution, wherein the amount of the nano-enhanced material added accounts for 1-5% of the mass of the polymer solution; (3) The nano-enhanced polymer solution is heated to 180-250° C. and ejected at a speed of 50-200 m / min to form a fiber. A high-speed airflow of 100-150 m / s is used to refine the fibers. The fibers are collected in a cooling device and then cooled to room temperature to form a fiber web. After drying and curing, a dynamic elastic fiber web is formed.

2. A dynamic elastic fiber net according to claim 1, characterized in that: The nano-reinforced material is subjected to silanization modification treatment, and epoxy silane is used to modify the surface of the nano-filler. The modification operation includes the following steps: The nano-reinforced material is mixed with water and an alcohol solvent, and an appropriate amount of epoxy silane is added and stirred, and then heated to 60-80° C., and stirred for 2-3 hours, and then filtered, washed, and dried to obtain the modified nano-reinforced material. The weight ratio of the nano-reinforced material to water, ethanol, and epoxy silane is 5-10:70-90:10-30:0.

1.

3. The dynamic elastic fiber net according to claim 1, characterized in that: The nano-reinforced material is obtained by mixing nano-silicon dioxide and carbon nanotubes in a weight ratio of 2-3:

1.

4. The dynamic elastic fiber net according to claim 1, characterized in that: The thermoplastic elastic fiber is any one of polyurethane, spandex and polyester fiber; The thickness of the dynamic elastic fiber net is 0.5-2 mm.

5. A method for preparing a non-woven wool felt based on embedding a dynamic elastic fiber net according to any one of claims 1 to 4, characterized in that: The steps include: The dynamic elastic fiber net and the wool felt substrate are stacked and laid, and a layer of dynamic elastic fiber net is laid between the two layers of wool felt substrate. The fiber net and the substrate are tightly integrated in the central area by a hot pressing process, and the hot pressing temperature is controlled at 50-80°C, the pressure is 3-10MPa, and the hot pressing time is 5-10 seconds; the edge area is further fixed by a light gradient needle punching process, and high-density needle punching is used in the edge bonding area of ​​the dynamic elastic fiber net and the wool felt, and the density is gradually reduced to low outwards to obtain a non-woven wool felt based on the dynamic elastic fiber net embedding; The central area is located at the geometric center of the wool felt, and its area accounts for 80%±5% of the area of ​​the wool felt, and is a circular or rectangular area; the edge area is 20%±5% of the area of ​​the wool felt, forming a ring or frame area around the central area.

6. The method for preparing a non-woven wool felt based on embedding a dynamic elastic fiber net according to claim 5, characterized in that: The needle penetration depth during the mild gradient acupuncture is 5-10 mm, and the acupuncture density is 50-100 needles / cm 2 .

7. The method for preparing a non-woven wool felt based on embedding a dynamic elastic fiber net according to claim 5, characterized in that: During the mild gradient needling process, the needling depth gradually increases from the edge to the edge of the hot-pressed bonding zone, and the change in needling depth is determined by the following formula: Among them, d (x) is the needle penetration depth at a distance x from the edge; d min The minimum puncture depth is 5 mm, located at the edge; d max The maximum needling depth is 10 mm, located at the edge of the heat-pressed bonding area; L is the total distance from edge to edge of the thermal compression bonding area.

8. The method for preparing a non-woven wool felt based on embedding a dynamic elastic fiber net according to claim 5, characterized in that: During the mild gradient needling process, the needling density gradually increases from the edge to the edge of the hot pressing bonding area, and the change in needling density is determined by the following formula: Among them, n (x) is the needle density (needles / cm 2 ); n min The minimum needle density is 50 needles / cm at the edge. 2 ; n max The maximum needle density is 100 needles / cm at the edge of the hot pressing bonding area. 2 ; L is the total distance from edge to edge of the thermal compression bonding area.

9. The method for preparing a non-woven wool felt based on embedding a dynamic elastic fiber net according to claim 5, characterized in that: The thickness of the wool felt is 5-10 mm.

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