Silk-like material with waterproof and antifouling functions and preparation method thereof

Abstract

The invention belongs to the field of functional textile materials, and particularly discloses a silk-like material with waterproof and antifouling functions and a preparation method of the silk-like material. The silk-like material comprises matrix fibers and a functional composite layer, and the matrix fibers are prepared from PETG-PTT copolymer, spandex and multiple auxiliaries through melt spinning of a special-shaped spinneret plate and have the texture of silk-like fabric; the functional composite layer is formed by coating the surface of the matrix fiber with a finishing liquid composed of fluorine-containing silane, a fluorine-containing acrylate copolymer, nano composite particles, waterborne polyurethane and a cross-linking agent through the steps of padding, pre-drying, low-temperature plasma activation, baking curing and the like. The silk-like material disclosed by the invention not only retains the gloss, softness and drapability of natural silk, but also has super-hydrophobic (water contact angle is greater than or equal to 150 degrees) and super-oleophobic (oil contact angle is greater than or equal to 120 degrees) properties, meanwhile, integrates excellent air and moisture permeability, antibacterial property and ultraviolet resistance, and can be widely applied to the fields of high-end clothing, home textiles, outdoor articles and the like.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of functional textile materials, and particularly relates to a simulated silk material with waterproof and stain-proof functions and a preparation method thereof. BACKGROUND

[0002] The simulated silk material has become one of the mainstream materials for replacing natural silk in the textile field due to its gloss, drape and skin-friendly touch close to natural silk, and is widely used in women's wear, home textiles and other scenes. However, the existing simulated silk products generally have the core pain point that the quality and function are difficult to be compatible. The traditional simulated silk adopts a polyester / spandex blended system, and the molecular chain contains a large number of hydrophilic groups, which are easily infiltrated by water, coffee, edible oil and other liquids, and the stains are difficult to clean after being attached; although the temporary hydrophobicity can be achieved by coating silicone or fluorine-based waterproof agent through post-finishing, such coating is only combined through physical adsorption, and is easily detached in the process of friction and washing, which not only leads to rapid attenuation of the waterproof and stain-proof performance (usually functional failure after 5-10 times of washing), but also reduces the softness and air permeability of the material due to the residual coating.

[0003] Part of the waterproof simulated silk adopts a "base material + film coating" composite process, which can improve the waterproof property, but the interfacial adhesion between the film layer and the base material is weak, and the long-term use is prone to delamination and wrinkling, and the rigidity of the film layer will also destroy the natural drape of the simulated silk, greatly reducing the wearing or using experience of the product.

[0004] In addition, the existing functional simulated silk has poor weather resistance, and the base material is easily aged and yellowed after ultraviolet irradiation, and the chemical structure of the functional layer is easily degraded, which further limits its application in outdoor products and other scenes.

[0005] In summary, there is currently a lack of a material that can not only retain the natural quality of simulated silk, but also has long-term waterproof and stain-proof, washing-resistant and weather-resistant properties, which cannot meet the needs of the consumer market for high-quality and multi-functional textile materials. SUMMARY

[0006] The purpose of the present application is to solve the problem that the existing products are difficult to have both function and quality, and to provide a simulated silk material with waterproof and stain-proof functions and a preparation method thereof, so that it not only retains the gloss, softness and drape quality of natural silk, but also has long-term waterproof and stain-proof properties, and at the same time, has excellent air permeability, moisture permeability and antibacterial properties, and improves the overall mechanical properties and weather resistance of the material.

[0007] To solve the above technical problems, the following technical solutions are adopted in the present application: A simulated silk material with waterproof and stain-proof functions, comprising a base fiber and a functional composite layer coated on the surface of the base fiber. The matrix fiber is composed of the following components by weight percentage: 94-96% modified polyester chips, 4-6% spandex chips, and 0.5-2% spinning and finishing aids; the modified polyester is a copolymer of polyethylene terephthalate-1,4-cyclohexanediol ester (PETG) and polypropylene terephthalate (PTT); the spandex is a polyether-type or polyester-type polyurethane elastomer; the spinning and finishing aids include antioxidants (0.1-0.3%, such as hindered phenolic antioxidant 1010), lubricants (0.2-0.8%, such as polydimethylsiloxane PDMS or modified silicone oil), antibacterial agents (0.1-0.5%, preferably nano-silver or quaternary ammonium salt grafted antibacterial agents), and ultraviolet light stabilizers (0.1-0.4%, such as benzotriazole or benzophenone ultraviolet absorbers). The functional composite layer is formed by a functional modifier component comprising 5-12% of the total mass of the matrix fiber. The functional modifier component includes: 1-3% of a fluorosilane coupling agent (such as trifluoropropyltrimethoxysilane, tridecafluorooctyltriethoxysilane, etc.), 2-5% of a fluorinated acrylate copolymer emulsion, 1-3% of nanocomposite particles, 0.5-2% of an aqueous polyurethane dispersion, and 0.3-1% of a crosslinking agent; the nanocomposite particles are a mixture of nano-silica and nano-zinc oxide.

[0008] The simulated silk material of this invention uses a specific ratio of PETG-PTT copolymer modified polyester and spandex as the matrix, combined with antioxidants, lubricants, antibacterial agents and anti-UV additives. The surface is formed by a functional modifier consisting of fluorosilane coupling agent, fluorinated acrylate copolymer emulsion, nano silica-zinc oxide composite particles, waterborne polyurethane dispersion and crosslinking agent to form a composite layer. It retains the luster, softness and drape of natural silk, and has long-lasting and stable waterproof and stain-resistant properties. At the same time, it also has excellent breathability and moisture permeability, antibacterial and UV resistance. The mechanical properties are reliable and it is washable and anti-aging. It is suitable for high-end clothing, home textiles and outdoor products and other applications.

[0009] As a further description of the above technical solution: In the copolymer of polyethylene terephthalate-1,4-cyclohexanediol and polyethylene terephthalate, the molar ratio of polyethylene terephthalate-1,4-cyclohexanediol units to polyethylene terephthalate units is 70:30 to 90:10. By precisely controlling the molar ratio of the two components in the PETG-PTT copolymer, the mechanical properties and elastic recovery ability of the material are further optimized.

[0010] As a further description of the above technical solution: the solid content of the fluorinated acrylate copolymer emulsion is 30-40%, wherein the fluorinated monomer units account for 20-30% of the total mass of the fluorinated acrylate copolymer. Through the synergistic effect of this emulsion with components such as fluorosilane coupling agents and nanocomposite particles, the material is endowed with excellent and long-lasting waterproof and stain-resistant properties (its function remains stable after multiple washes). Furthermore, due to the optimized specific ratio of fluorinated monomer units, the film-forming properties and breathability of the functional composite layer are also taken into account.

[0011] As a further description of the above technical solution: the particle size of the nano-silica is 10-50 nm, the particle size of the nano-zinc oxide is 20-80 nm, and the mass ratio of nano-silica to nano-zinc oxide is 3:1 to 1:1. Through the synergistic effect of the two nanoparticles (such as the micro-nano rough structure constructed by nano-silica and the antibacterial and anti-UV properties of nano-zinc oxide), functional complementarity is formed with components such as fluorosilane coupling agents and fluorinated acrylate copolymer emulsions, significantly improving the long-lasting waterproof and stain-resistant properties, antibacterial rate, and UV resistance of the material. Furthermore, the optimized ratio of nanoparticles avoids agglomeration problems, ensuring the uniformity and breathability of the functional composite layer.

[0012] As a further description of the above technical solution: the solid content of the waterborne polyurethane dispersion is 25-35%; the crosslinking agent is a waterborne isocyanate or aziridine crosslinking agent, which not only ensures the strong bond between the functional composite layer and the irregular cross-section matrix fiber, improving the long-term waterproof and stain-resistant properties and water-washing resistance of the material, but also takes into account the film uniformity and flexibility of the functional layer, and avoids the material from becoming hard to the touch.

[0013] This invention also provides a method for preparing a simulated silk material with waterproof and stain-resistant functions, comprising the following steps: (1) Preparation of matrix fiber: After drying the modified polyester chips and spandex chips respectively, they are mixed with spinning and finishing agents, and then melt-spun, cooled, drawn, twisted and wound into shape; the melt spinning adopts a spinneret with an irregular cross section; (2) Preparation of functional finishing liquid: Deionized water, fluorosilane coupling agent, fluorinated acrylate copolymer emulsion, nanocomposite particles, waterborne polyurethane dispersion and crosslinking agent are mixed in sequence, stirred and dispersed evenly and then matured; (3) Coating and curing: The matrix fiber obtained in step (1) or the fabric woven from it is immersed in the functional finishing liquid prepared in step (2) and then pre-dried, treated with low temperature plasma, and then baked and cured. (4) Finishing: The cured fiber or fabric is washed and shaped to obtain a simulated silk material with waterproof and stain-resistant functions.

[0014] The preparation method of this invention combines melt spinning of irregular cross sections with impregnation with a functional finishing liquid containing fluorinated silane and nanoparticles, followed by low-temperature plasma treatment and baking curing. This achieves a strong bond between the functional components and the matrix fibers, ensuring the material's simulated silk texture while giving it excellent and long-lasting waterproof and stain-resistant properties. It also takes into account antibacterial, UV resistance, and breathability and moisture permeability. The process steps are continuous and the parameters are controllable. No special equipment is required, making it environmentally friendly and suitable for continuous industrial production. It can stably prepare high-quality multifunctional simulated silk materials.

[0015] As a further description of the above technical solution: In step (1), the drying temperature of the modified polyester chips is 120-140℃, and the drying time is 4-8 hours. This effectively removes moisture from the modified polyester chips and avoids degradation or changes in the macromolecular structure of the modified polyester chips due to excessively high temperatures, ensuring good performance stability in subsequent processing. The drying temperature of the spandex chips is 80-100℃, and the drying time is 4-8 hours. This prevents the spandex from overheating and aging, maintains its excellent elasticity and resilience, and endows the final product with excellent stretchability. The melt spinning temperature is 250-280℃. At this temperature, the modified polyester chips and spandex chips can fully melt, and the intermolecular forces are reduced. The low temperature results in good melt flowability, providing favorable conditions for subsequent extrusion molding through a spinneret, ensuring uniform filament thickness and a smooth surface. However, if the temperature is below 250℃, the chips will not melt sufficiently, increasing the melt viscosity and reducing flowability. This can easily lead to problems such as clogging of the spinneret orifices, fuzzing, and filament breakage during extrusion, severely impacting production efficiency and fiber quality. Conversely, if the temperature exceeds 280℃, the polymer molecular chains will undergo degradation and oxidation, resulting in a decrease in fiber strength, elasticity, color, and other properties, failing to meet practical application requirements. The draw ratio is 3 to 5 times. Stretching at this ratio effectively improves fiber strength and orientation, making the fiber molecular chains more orderly arranged along the axial direction, thereby enhancing the structural stability of the fiber. This process fully leverages the elasticity of spandex, giving the product excellent elastic recovery properties and meeting the elasticity requirements of the product in different application scenarios. If the draw ratio is too small, the fiber orientation and crystallinity will not be significantly improved, and the potential performance of the fiber cannot be fully explored, making it difficult for the product's strength and elasticity to reach the ideal state. If the draw ratio is too large, the fiber will experience elastic fatigue due to excessive stretching, or even breakage, leading to a decline in product quality and failure to meet actual usage needs.

[0016] As a further description of the above technical solution: In step (3), the impregnation adopts a two-dip and two-roll process with a liquid rate of 60-80%, which can ensure that the functional finishing liquid is uniform and fully wets the irregular cross-section matrix fiber and its surface micro-nano structure; the pre-baking temperature is 80-120℃ and the pre-baking time is 1-3 minutes, so as to efficiently remove excess moisture and avoid premature curing of functional components; the low-temperature plasma treatment is carried out in an inert gas atmosphere, with a treatment power of 10-50 W and a treatment time of 1-5 minutes, to activate the fiber surface to enhance the bonding force with the functional layer; the baking curing temperature is 130-160℃ and the baking curing time is 3-8 minutes, so as to achieve full cross-linking of functional components. The coordinated cooperation of various parameters not only ensures the firmness, uniformity and stability of the functional composite layer, but also improves the long-term waterproof and stain-resistant performance and water-washing resistance of the material, while taking into account the simulated silk texture and soft hand feel of the material, avoiding the functional layer from becoming brittle or the material's breathability from being damaged. At the same time, it is compatible with the industrial continuous production requirements of the overall process and can stably produce high-quality multifunctional simulated silk materials.

[0017] As a further description of the above technical solution: In step (2), the solid content of the functional finishing liquid is 10-20%, which not only ensures the effective concentration of the functional components, but also allows them to fully interact with the micro-nano structure on the surface of the irregular cross-section matrix fiber to form a uniform and dense functional composite layer, but also avoids the finishing liquid from becoming less fluid and unevenly coated due to excessive solid content; In step (4), the setting temperature is 150-180℃ and the setting time is 30-60 seconds, which can quickly stabilize the size and shape of the material, enhance the structural stability and drape, and, in conjunction with other precisely controlled process parameters and component ratios, not only further improve the long-term effectiveness and washability of the material's waterproof, anti-fouling, antibacterial, and UV-resistant functions, but also retain the soft feel and luster of the simulated silk to the greatest extent. The process is suitable for industrial continuous production and can stably produce high-quality, multifunctional and uniform simulated silk materials.

[0018] Compared with the prior art, the beneficial effects of the present invention are: 1. Superior Water and Stain Resistance and Long-Lasting Performance: Through the construction of a micro-nano rough structure and low surface energy coating on the fiber surface using fluorosilane coupling agents, fluorinated acrylate copolymers, and nanocomposite particles, superhydrophobic (water contact angle ≥150°) and superoleophobic (contact angle ≥120° for edible oils, coffee, etc.) effects are achieved. Simultaneously, low-temperature plasma pretreatment enhances the bonding force between the fiber and the functional layer. Combined with the use of crosslinking agents, this ensures that the water and stain resistance remains at a high level (functionality retention rate ≥90%) even after more than 50 standard washes.

[0019] 2. Excellent simulated silk texture and wearing comfort: Utilizing a composite spinning process of PETG-PTT copolymer and spandex, combined with an irregular cross-section design, the fiber possesses a natural silk-like luster, soft hand feel, and excellent drape. The functional finishing solution formula incorporates appropriate amounts of water-based polyurethane and softeners, along with a low-temperature baking process, avoiding the stiffness associated with traditional coatings and ensuring the material's breathability (breathability ≥300 mm / s) and moisture permeability (moisture permeability ≥5000 g / m³). 2 • 24 h).

[0020] 3. Multifunctional integration: By introducing nano zinc oxide (which has both UV shielding and certain antibacterial properties), special antibacterial agents and UV stabilizers into the formula, the present invention enables the material to simultaneously possess antibacterial (inhibition rate of ≥99% against Staphylococcus aureus, Escherichia coli, etc.), UV resistance (UPF≥50+) and anti-aging properties, thus expanding its application fields.

[0021] 4. Enhanced mechanical properties: The introduction of PETG-PTT copolymer and optimized spinning process improve the breaking strength and elongation at break of the fiber, while the functional layer also provides some protection for the fiber.

[0022] 5. Environmental protection and process controllability: The functional finishing liquid mainly adopts an aqueous system, which reduces the use of organic solvents, making it more environmentally friendly. Moreover, the entire preparation process is relatively mature, and the parameters of each step are easy to control, making it suitable for large-scale industrial production. Attached Figure Description

[0023] Figure 1 These are the water contact angles of the embodiment and three comparative fabrics.

[0024] Figure 2 The water contact angles of the fabrics in the examples and three comparative examples after 50 washes are shown. Detailed Implementation

[0025] The claims of the present invention will be further described in detail below with reference to specific embodiments, but this does not constitute any limitation on the present invention. Any limited modifications made by any person within the scope of protection of the claims of the present invention are still within the scope of protection of the claims of the present invention.

[0026] A simulated silk material with waterproof and stain-resistant properties includes a matrix fiber and a functional composite layer coated on the surface of the matrix fiber. The base fiber raw materials include: 94.5 kg of modified polyester chips (PETG-PTT copolymer, PETG unit to PTT unit molar ratio 85:15); 4.3 kg of polyether-type spandex chips; spinning and finishing auxiliaries: antioxidant 1010 (0.2 kg), PDMS lubricant (0.5 kg), nano silver antibacterial agent (0.3 kg), and ultraviolet light stabilizer UV-P (0.2 kg). The raw materials for the functional finishing liquid include: 2 kg of fluorosilane coupling agent (tridecylfluorooctyltriethoxysilane); 3.5 kg of fluorinated acrylate copolymer emulsion (35% solid content, 25% fluorinated monomer units); 2 kg of nanocomposite particles (20 nm nano SiO2 particles, 50 nm nano ZnO particles, mass ratio 2:1); 1 kg of waterborne polyurethane dispersion (30% solid content); and 0.6 kg of waterborne isocyanate crosslinking agent.

[0027] Its preparation method includes four core steps: matrix fiber preparation, functional finishing solution preparation, coating and curing, and post-finishing, as detailed below: Matrix fiber preparation PETG-PTT copolymer chips were placed in a vacuum drying oven and dried at 130°C for 6 hours until the moisture content was ≤0.05%; polyether-type spandex chips were placed in another vacuum drying oven and dried at 90°C for 6 hours until the moisture content was ≤0.1%. The dried PETG-PTT copolymer chips, spandex chips, antioxidant 1010, PDMS lubricant, nano silver antibacterial agent, and UV-P light stabilizer were added to a high-speed mixer in proportion and mixed at 200 rpm for 15 minutes until homogeneous. The mixture was then fed into a twin-screw extruder, and the extrusion temperatures were set as follows: 250°C for the feeding section, 265°C for the melting section, and 260°C for the metering section. The melt was extruded through a four-lobed shaped spinneret (spinneret orifice diameter 0.3 mm, with spiral microgrooves on the inner wall of the orifice). The ejected filaments are cooled to room temperature by cooling air at 25°C and 1.0 m / s, and then subjected to 4 times stretching (stretching roller temperature 80°C) and 100 twists / meter twisting treatment. Finally, they are wound into shape at a speed of 500 m / min to obtain the matrix fiber.

[0028] Preparation of functional finishing solution Add 80 kg of deionized water to the reactor and start stirring (500 rpm); add fluorosilane coupling agent and fluorinated acrylate copolymer emulsion in sequence, and stir for 10 minutes until homogeneous; Slowly add nano-SiO2 / ZnO composite particles, along with 0.1 kg of polycarboxylate dispersant. Increase the stirring speed to 1500 rpm and disperse for 45 minutes. Then, use 20 kHz ultrasonic dispersion for 15 minutes to ensure that the nanoparticles do not agglomerate. Add the waterborne polyurethane dispersion and continue stirring for 20 minutes; finally, add the waterborne isocyanate crosslinking agent, adjust the pH of the system to 5.5 with acetic acid, stir for 10 minutes, and then mature for 30 minutes to obtain a functional finishing liquid with a solid content of 15%.

[0029] (3) Coating and curing The greige fabric woven from the base fibers (warp density 120 threads / inch, weft density 80 threads / inch) is immersed in the functional finishing solution and subjected to a two-dip, two-roll process (roll pressure 0.3 MPa) while controlling the liquid application rate to 70%. The impregnated fabric is sent into a hot air pre-dryer and pre-dried at 100°C for 2 minutes to remove more than 80% of the moisture from the surface of the fabric. The pre-dried fabric was sent into a low-temperature plasma treatment device, argon gas (flow rate 20 L / min) was introduced, the power was set to 30 W and the treatment time was 3 minutes to activate the surface of the fabric. The plasma-treated fabric is then placed in a hot air baking machine and baked at 150°C for 5 minutes to allow the components in the functional finishing liquid to fully cross-link.

[0030] (4) Post-processing The cured blank was placed in room temperature deionized water and washed at a speed of 20 m / min to remove uncrosslinked small molecule substances from the surface. The washed fabric is fed into a tenter frame, with the temperature set at 170℃ and the time at 45 seconds. The width shrinkage rate is controlled to be ≤2% to obtain the simulated silk material.

[0031] The performance of the prepared simulated wire material was tested, and the results are as follows: Waterproof performance: Water contact angle 152° ( Figure 1 As shown), after 50 standard water washes (GB / T 3921-2008), the water contact angle is 136°. Figure 2 (as shown) Stain resistance: 125° contact angle with cooking oil; coffee stains can be completely rolled off without residue after being left to stand for 30 minutes. Air permeability and moisture permeability: Air permeability 320 mm / s (GB / T 5453-1997), moisture permeability 4200 g / (m²). 2 ・24h) (GB / T12704-2009); Antibacterial properties: The inhibition rate against Staphylococcus aureus (ATCC 6538) is 99.5% (GB / T 20944.3-2008). UV protection performance: UV protection factor UPF 50+ (GB / T 18830-2009); Hand feel and luster: Professionally rated, the softness reaches level 4.5 (level 5 is the best), and the luster is close to that of natural mulberry silk (difference ≤2%). Comparative Example 1: Simulated filament material without low-temperature plasma treatment The preparation process is the same as in Example 1, except that the "low-temperature plasma treatment" step is omitted, and the other parameters remain unchanged. The performance test results are as follows: Water contact angle 122°, water contact angle 103° after 50 water washes; The inhibition rate against Staphylococcus aureus was 90.2%; The peel strength between the functional layer and the matrix fiber was reduced by 35% compared to Example 1.

[0032] Comparative Example 2: Simulated silk material without nanocomposite particles The preparation process is the same as in Example 1, except that nano-SiO2 / ZnO composite particles are removed from the functional finishing solution, while other parameters remain unchanged. The performance test results are as follows: Water contact angle 118°, water contact angle 95° after 50 water washes; Air permeability: 280 mm / s; Moisture permeability: 3600 g / (m²) 2 •24h); UV protection: UPF 30+.

[0033] Comparative Example 3: Simulated Silk Material Using Traditional Coating Processes Waterproof simulated silk material was prepared using the traditional "substrate + silicone coating" process, and the performance test results are as follows: The water contact angle is 112°, and after 5 washes, the water contact angle is 88°. Air permeability 150 mm / s, moisture permeability 2500 g / (m²) 2 • 24 h); The softness level is 2.0, and the drape factor is increased by 20% compared to Example 1 (the drape is worse).

[0034] Therefore, it can be seen that the simulated silk material prepared in Example 1 of the present invention, through the coordinated control of the proportions of each raw material and process parameters, achieves the integration and long-term stability of functions such as waterproofing, stain resistance, antibacterial properties, and UV protection while retaining the texture of simulated silk. Its comprehensive performance is significantly better than that of the comparative product.

[0035] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the present invention.

Claims

1. A simulated silk material with waterproof and stain-resistant functions, characterized in that: Includes matrix fibers and a functional composite layer coated on the surface of the matrix fibers; The matrix fiber is composed of the following components by weight percentage: 94-96% modified polyester chips, 4-6% spandex chips, and 0.5-2% spinning and finishing agents; the modified polyester is a copolymer of polyethylene terephthalate-1,4-cyclohexanediol ester and polypropylene terephthalate; the spandex is a polyether-type or polyester-type polyurethane elastomer; the spinning and finishing agents include antioxidants, lubricants, antibacterial agents, and ultraviolet light stabilizers. The functional composite layer is formed by a functional modifier component comprising 5-12% of the total mass of the matrix fiber. The functional modifier component includes: 1-3% fluorosilane coupling agent, 2-5% fluorinated acrylate copolymer emulsion, 1-3% nanocomposite particles, 0.5-2% aqueous polyurethane dispersion, and 0.3-1% crosslinking agent. The nanocomposite particles are a mixture of nano-silica and nano-zinc oxide.

2. The simulated silk material according to claim 1, characterized in that: In the copolymer of polyethylene terephthalate-1,4-cyclohexanediol and polyethylene terephthalate, the molar ratio of polyethylene terephthalate-1,4-cyclohexanediol units to polyethylene terephthalate units is 70:30 to 90:

10.

3. The simulated silk material according to claim 1, characterized in that: The solid content of the fluorinated acrylate copolymer emulsion is 30-40%, wherein the fluorinated monomer unit accounts for 20-30% of the total mass of the fluorinated acrylate copolymer.

4. The simulated silk material according to claim 1, characterized in that: The nano-silica has a particle size of 10–50 nm, the nano-zinc oxide has a particle size of 20–80 nm, and the mass ratio of nano-silica to nano-zinc oxide is 3:1 to 1:

1.

5. The simulated silk material according to claim 1, characterized in that: The solid content of the waterborne polyurethane dispersion is 25-35%; the crosslinking agent is a waterborne isocyanate or a aziridine crosslinking agent.

6. A method for preparing the simulated silk material according to any one of claims 1 to 5, characterized in that, Includes the following steps: (1) Preparation of matrix fiber: After drying the modified polyester chips and spandex chips respectively, they are mixed with spinning and finishing agents, and then melt-spun, cooled, drawn, twisted and wound into shape; the melt spinning adopts a spinneret with an irregular cross section; (2) Preparation of functional finishing liquid: Deionized water, fluorosilane coupling agent, fluorinated acrylate copolymer emulsion, nanocomposite particles, waterborne polyurethane dispersion and crosslinking agent are mixed in sequence, stirred and dispersed evenly and then matured; (3) Coating and curing: The matrix fiber obtained in step (1) or the fabric woven from it is immersed in the functional finishing liquid prepared in step (2) and then pre-dried, treated with low temperature plasma, and then baked and cured. (4) Finishing: The cured fiber or fabric is washed and shaped to obtain a simulated silk material with waterproof and stain-resistant functions.

7. The preparation method according to claim 6, characterized in that: In step (1), the drying temperature of the modified polyester chips is 120-140℃ and the drying time is 4-8 hours; the drying temperature of the spandex chips is 80-100℃ and the drying time is 4-8 hours; the temperature of the melt spinning is 250-280℃; and the draw ratio is 3-5 times.

8. The preparation method according to claim 6, characterized in that: In step (3), the immersion rolling adopts a two-immersion two-roll process with a rolling liquid ratio of 60-80%; the pre-drying temperature is 80-120℃ and the pre-drying time is 1-3 minutes; the low-temperature plasma treatment is carried out in an inert gas atmosphere with a treatment power of 10-50 W and a treatment time of 1-5 minutes; the baking and curing temperature is 130-160℃ and the baking and curing time is 3-8 minutes.

9. The preparation method according to claim 6, characterized in that: In step (2), the solid content of the functional finishing liquid is 10-20%; in step (4), the setting temperature is 150-180℃ and the setting time is 30-60 seconds.

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