High-wear-resistance green composite functional fiber and textile fabric thereof
By designing core-shell structured fibers and limiting process parameters, the problem of balancing wear resistance, mechanical properties, and processing stability of fiber materials was solved, achieving a stable improvement in high wear-resistant green composite fibers.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHAOXING JINQIANG KNIT TEXTILES CO LTD
- Filing Date
- 2026-04-03
- Publication Date
- 2026-06-05
AI Technical Summary
Existing fiber materials struggle to balance wear resistance, mechanical properties, and processing stability, while green and environmentally friendly materials have room for improvement in terms of wear resistance and processing adaptability.
The fiber adopts a core-shell structure design. The core layer is composed of a composite matrix of polypropylene terephthalate and polyamide 56 and cellulose nanocrystals, while the shell layer is composed of bio-based thermoplastic polyurethane and wax-based lubricating microcapsules. The wear resistance and processing stability of the fiber are ensured by using a coaxial core-shell composite melt spinning process and limiting process parameters.
This achieved a stable improvement in the abrasion resistance of the fiber, avoided spinning fluctuations and a decline in mechanical properties, and maintained the spinnability and environmental friendliness of the fiber.
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Abstract
Description
Technical Field
[0001] This invention relates to the technical field of textile materials, and in particular to a highly wear-resistant, green composite functional fiber and its textile fabric. Background Technology
[0002] Textile fibers are widely used in clothing, industrial fabrics, and other fields. During use, they are typically subjected to continuous friction, bending, and certain loads. Their abrasion resistance has a significant impact on the service life and performance stability of the fabric. With the diversification of application conditions, the requirements for fiber abrasion resistance are constantly increasing.
[0003] In existing technologies, methods to improve the abrasion resistance of fibers mainly include selecting polymer materials with good abrasion resistance, introducing reinforcing or friction-reducing components into the fibers, and improving the fiber structure and properties by adjusting spinning and post-processing. Polyester and polyamide materials are widely used in the field of abrasion-resistant fibers due to their good overall performance.
[0004] However, it is often difficult to achieve a balance between wear resistance, mechanical properties, and processing stability in a single material system. When functional components are introduced through blending, their dispersion state and interfacial compatibility are easily affected by processing conditions, which may lead to fluctuations in fiber properties or a decrease in spinnability. In addition, some friction-reducing or lubricating components are prone to migration or failure during high-temperature melt processing, making it difficult to maintain stable effects during use.
[0005] Meanwhile, with the increasing application of green and environmentally friendly fiber materials, there is still room for further improvement in the wear resistance and processing adaptability of related material systems.
[0006] Therefore, it is still necessary to provide a textile fiber and its preparation method that can stably improve the abrasion resistance of the fiber while taking into account the processing adaptability and environmental friendliness. Summary of the Invention
[0007] The purpose of this invention is to overcome the above-mentioned problems existing in the prior art and to provide a high wear-resistant green composite functional fiber and its textile fabric.
[0008] To achieve the above objectives, the first aspect of the present invention provides a highly wear-resistant green composite functional fiber, wherein the composite functional fiber is a core-shell structure fiber, comprising, by weight: Core layer components: 40-55 parts of polypropylene terephthalate; Polyamide 5615-30 parts; 1-4 parts of cellulose nanocrystals; 0.2–1.5 parts of maleic anhydride graft compatibilizer; Shell components: 20-35 parts of bio-based thermoplastic polyurethane; 0.2–1.0 parts of wax-based lubricating microcapsules; The sum of the weight parts of the core layer component and the shell layer component is 100 parts.
[0009] Furthermore, the weight ratio of the core layer component to the shell layer component is 65-75:25-35, and it is prepared using a coaxial core-shell composite melt spinning process at a spinning speed of 2000-4000 m / min.
[0010] Furthermore, in the core layer component, the weight ratio of polypropylene terephthalate to polyamide 56 is 1.5 to 3.5:1.
[0011] Furthermore, the average particle size of the cellulose nanocrystals is 50–300 nanometers.
[0012] Furthermore, the wax-based lubricating microcapsules have an average particle size of 0.2 to 3 micrometers. The wax-based lubricating microcapsules are added to the shell component after the bio-based thermoplastic polyurethane has been completely melted, and the addition process occurs in an independent melt mixing stage before composite spinning.
[0013] A second aspect of the present invention provides a method for preparing the high wear-resistant green composite functional fiber as described above, comprising the following steps: S1. The polypropylene terephthalate, polyamide 56, cellulose nanocrystals and maleic anhydride graft compatibilizer in the core layer component are dried, premixed and melt-blended in a twin-screw extruder to obtain the core layer composite masterbatch. S2. The core layer composite masterbatch is melted and plasticized to obtain a core layer melt with a fixed composition; S3. Melt the bio-based thermoplastic polyurethane in the shell component, add wax-based lubricating microcapsules and mix to obtain the shell melt; S4. Using a coaxial core-shell composite spinning method, the core melt and the shell melt are combined and spun to form a composite initial growth filament; S5. The composite nascent filament is stretched and heat-set to obtain the high wear-resistant green composite functional fiber.
[0014] Furthermore, the melt blending is carried out at 200–250°C, and the screw speed of the twin-screw extruder is 200–400 rpm.
[0015] Furthermore, the bio-based thermoplastic polyurethane has a melting temperature of 170–210°C, and the wax-based lubricating microcapsules are added and mixed in the molten state.
[0016] Furthermore, the composite spinning speed is 2000–4000 m / min.
[0017] Furthermore, the total draw ratio is 2.5 to 3.5, and the heat setting temperature is 130 to 170°C.
[0018] The third aspect of the present invention provides a textile fabric using the above-mentioned high abrasion-resistant green composite functional fiber, wherein the textile fabric is any one of woven fabric, knitted fabric or nonwoven fabric. The high wear-resistant green composite functional fiber exists in textile fabrics either as a single fiber or as a blend with other textile fibers.
[0019] The present invention, by adopting the above technical solution, has the following beneficial effects: (1) In terms of the division of labor in the material system design, the elements that improve the wear resistance of the fiber are divided into two functional regions: the core layer and the shell layer. The core layer adopts a composite matrix of polypropylene terephthalate and polyamide 56, and introduces cellulose nanocrystals. At the same time, maleic anhydride graft compatibilizer is used to establish interfacial coupling. This design makes the cellulose nanocrystals, as a rigid phase with high modulus and low density, effectively improve the material's ability to constrain local shear deformation in the wear process where micro-cutting and adhesive wear coexist. By limiting the weight ratio of polypropylene terephthalate to polyamide 56 to the range of 1.5-3.5:1, it is ensured that the core layer maintains good viscoelasticity and crystallization behavior during melting, spinning and drawing, avoiding phase separation or viscosity mismatch, so that the nanocrystals are transformed from simple fillers into structural units that truly participate in load bearing. In this way, not only is the problem of the reinforcing phase being difficult to stably control on the fiber surface and in the shear field in the existing technology overcome, effectively avoiding spinning fluctuations and drawing breakage, but also the stable improvement of wear resistance is achieved, avoiding the dispersion of wear resistance performance. The shell layer utilizes bio-based thermoplastic polyurethane and incorporates wax-based lubricating microcapsules. By limiting the average particle size of the microcapsules to 0.2-3 micrometers, the risks of excessively large particle sizes leading to spinneret problems and stress concentration are prevented, while excessively small particle sizes avoid aggregation or premature breakage in the melt. Furthermore, the microcapsules are added during a separate melt-mixing stage, after the bio-based thermoplastic polyurethane has completely melted and before composite spinning. This process effectively ensures the microcapsules remain sufficiently intact during melt processing, preventing premature migration of the lubricating wax phase that could cause slippage during spinning. It also ensures the gradual release of the microcapsules during frictional application, forming a relatively stable low-friction interface. This significantly increases the probability that the microcapsules remain usable after fiber formation, overcoming the problem of premature lubricant phase release and migration leading to premature consumption during subsequent frictional action, a problem present in existing technologies.
[0020] (2) In terms of process path constraint design, the weight ratio of the core layer to the shell layer is limited to 65-75 to 25-35, which is matched with the coaxial core-shell composite melt spinning and the spinning speed of 2000-4000 meters per minute. This ratio range enables the shell layer to form a stable coating, ensuring that the lubricating phase is in the region directly related to the friction interface, while avoiding the dilution of the core layer's load-bearing contribution due to an excessively large shell layer ratio, which would lead to a decrease in overall strength retention. The appropriate spinning speed determines the rhythm of melt stretching and cooling solidification, ensuring the stability of the core-shell interface at the moment of forming. When the speed is too low, the microcapsules are heated for a longer time and migrate fully, which can easily cause microcapsule breakage or dispersion instability; when the speed is too high, the tensile stress and viscosity gradient are steep, and the core-shell flow fluctuations can easily lead to uneven layer thickness and spinning fluctuations. Through such synergistic constraints, the effective load-bearing capacity of the reinforcing phase and the effective fidelity of the lubricating phase are achieved, and the wear resistance improvement is elevated from a simple material superposition to the result of structural and process synergy, ensuring the stability and reliability of product quality. Furthermore, the draw ratio is limited to 2.5-3.5, and the heat setting temperature is limited to 130-170 degrees Celsius. These two parameters ensure the stability of the core-shell structure during the fiber orientation and setting stages after forming. Since the core layer is a polyester / polyamide composite system and the shell layer is a polyurethane system, the viscoelasticity and thermal response of each layer differ. Appropriate draw and heat setting ranges prevent interlayer stress accumulation leading to interfacial instability, thus preventing fiber mechanical dispersion or decreased processing stability. This allows for stable and controllable operation of the core-shell composite throughout the entire process from forming to post-processing, providing a solid guarantee for improved overall performance and achieving a good effect of steadily improving spinnability, processing stability, and abrasion resistance. Detailed Implementation
[0021] The following provides a detailed description of specific embodiments of the present invention. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.
[0022] Unless otherwise defined, all scientific and technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art.
[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0024] Unless otherwise specified, all materials and reagents used in the following examples are commercially available.
[0025] The present invention will now be described in detail with reference to specific embodiments, which are intended to understand rather than limit the invention.
[0026] Unless otherwise specified, the following components in the examples use the following models: Polypropylene terephthalate (PPT) selected is Sorona, manufactured by DuPont. 3301 BK001 type polypropylene terephthalate (PTT) resin; Polyamide 56 is a linear polyamide 56 resin obtained by polycondensation of pentanediamine and adipic acid, and it is a general-purpose melt spinning grade product. The cellulose nanocrystals used are TL-003 type cellulose nanocrystals produced by Nanjing Tianlu Nanotechnology Co., Ltd. The maleic anhydride graft compatibilizer used is LOTADER manufactured by Arkema. AX8900 type reactive compatibilizer; The bio-based thermoplastic polyurethane selected is ESTANE manufactured by Lubrizol. ECO series spinning-grade bio-based thermoplastic polyurethane resins; The wax-based lubricating microcapsules are plant-based lubricating microcapsules. The core material is a composite wax system formed by carnauba wax and hydrogenated castor oil, and the shell material is a microcapsule structure formed by a heat-resistant polymer coating layer. The average particle size of the microcapsules is 5-30 μm, the melt release temperature of the core material is 70-110 ℃, and the microcapsules maintain structural integrity below 200 ℃.
[0027] Example 1 This embodiment discloses a highly wear-resistant green composite functional fiber and its textile fabric.
[0028] In this embodiment, the overall formulation of the high abrasion-resistant green composite functional fiber, based on 100 parts by weight, has the following components and dosages: (a) Core layer components Polypropylene terephthalate: 48 parts by weight Polyamide 56: 20 parts by weight; Cellulose nanocrystals: 2 parts by weight; Maleic anhydride graft compatibilizer: 0.5 parts by weight; The total weight of the core layer components is 70.5 parts.
[0029] (ii) Shell components Bio-based thermoplastic polyurethane: 29 parts by weight; Wax-based lubricating microcapsules: 0.5 parts by weight; The total weight of the shell components is 29.5 parts.
[0030] In this embodiment, the preparation method of the high wear-resistant green composite functional fiber includes the following steps: Preparation of S1 core-layer composite masterbatch: The polypropylene terephthalate, polyamide 56, cellulose nanocrystals, and maleic anhydride graft compatibilizer in the core layer component formulation were dried separately. Specifically, the polypropylene terephthalate was dried at 120°C for 6 hours, the polyamide 56 was dried at 110°C for 6 hours, the cellulose nanocrystals were dried at 80°C for 12 hours, and the maleic anhydride graft compatibilizer was dried at 80°C for 4 hours.
[0031] After drying, the polypropylene terephthalate and polyamide 56 are first added to a high-speed mixer for premixing at 800 rpm for 5 minutes; then the cellulose nanocrystals and maleic anhydride graft compatibilizer are added and mixed for another 3 minutes at 600 rpm to obtain a uniform core layer premix.
[0032] The core layer premix is continuously fed into a twin-screw extruder for melt blending. The twin-screw extruder has a screw length-to-diameter ratio of 40:1. The temperatures of each temperature zone from the feeding end to the die head end are set sequentially to 210℃, 220℃, 230℃, and 240℃, with the die head temperature at 240℃. The screw speed is 300 rpm, and the feed rate is 12 kg / h.
[0033] After the molten material is extruded from the die, it is cooled by circulating water at 20°C and then pelletized to obtain core-layer composite masterbatch particles.
[0034] Preparation of S2 core melt: After drying the core-layer composite masterbatch particles obtained in step S1 again at 120°C for 4 hours, they were directly added to the melt extrusion system for melt plasticization. The melt temperature was controlled at 230°C, and the mixture was stirred at 120 rpm for 10 minutes at this temperature to eliminate the temperature gradient and stabilize the rheological state of the melt, thus obtaining a core-layer melt with a fixed composition.
[0035] Preparation of S3 shell melt: The bio-based thermoplastic polyurethane and wax-based lubricating microcapsules in the shell layer of the formulation were dried separately, wherein the bio-based thermoplastic polyurethane was dried at 100°C for 8 hours and the wax-based lubricating microcapsules were dried at 60°C for 6 hours.
[0036] After drying, the bio-based thermoplastic polyurethane is first added to a single-screw extruder for melt plasticization. The screw length-to-diameter ratio is 30:1, the temperature of each temperature zone is uniformly set to 190℃, and the screw speed is 250rpm.
[0037] After the bio-based thermoplastic polyurethane is completely melted and forms a stable melt, the wax-based lubricating microcapsules are added through a side-feeding device, and the mixture is continued to be mixed for 5 minutes under low shear conditions to ensure that the lubricating microcapsules are uniformly dispersed and maintain structural integrity, thus obtaining a shell melt.
[0038] S4 core-shell composite melt spinning: Spinning is performed using a coaxial core-shell composite spinneret assembly with a single orifice diameter of 0.3 mm and a total of 48 orifices.
[0039] During the spinning process, the core melt temperature is controlled at 230℃ and the shell melt temperature is controlled at 190℃. By adjusting the delivery rate of the two melt metering pumps, the mass ratio of the core to the shell is made consistent with the weight ratio of the core component to the shell component in the raw material formula.
[0040] The spinning speed was set to 3000 m / min. After the melt was extruded from the spinneret, it underwent initial solidification in a cooling air field with a transverse wind speed of 0.5 m / s and an air temperature of 22°C, forming a composite initial growth filament.
[0041] S5 drawing and heat setting treatment: The obtained composite nascent filaments were sequentially drawn through two stages of drawing rollers. The first stage had a draw ratio of 1.8, the second stage had a draw ratio of 1.67, and the total draw ratio was 3. After drawing, the filaments entered the heat setting zone and were held at a constant temperature of 150°C for 30 seconds. They were then cooled to room temperature by cooling rollers and wound up to obtain high abrasion-resistant green composite functional fibers.
[0042] The high abrasion-resistant green composite functional fiber obtained above is used to make yarn through conventional spinning process, and then woven into textile fabric through machine weaving, knitting or non-woven process, thereby obtaining a textile fabric made from the high abrasion-resistant green composite functional fiber.
[0043] Example 2 The only difference between this embodiment and Embodiment 1 is the ratio of the core layer components to the shell layer components.
[0044] In this embodiment, the overall formulation of the high abrasion-resistant green composite functional fiber, based on 100 parts by weight, has the following components and dosages: (a) Core layer components Polypropylene terephthalate: 46 parts by weight; Polyamide 56: 19 parts by weight; Cellulose nanocrystals: 2 parts by weight; Maleic anhydride graft compatibilizer: 0.5 parts by weight; The total weight of the core layer components is 67.5 parts.
[0045] (ii) Shell components Bio-based thermoplastic polyurethane: 32 parts by weight; Wax-based lubricating microcapsules: 0.5 parts by weight; The total weight of the shell components is 32.5 parts.
[0046] Example 3 The only difference between this embodiment and Embodiment 1 is the ratio of the core layer components to the shell layer components.
[0047] In this embodiment, the overall formulation of the high abrasion-resistant green composite functional fiber, based on 100 parts by weight, has the following components and dosages: (a) Core layer components Polypropylene terephthalate: 50 parts by weight; Polyamide 56:20 parts by weight; Cellulose nanocrystals: 2 parts by weight; Maleic anhydride graft compatibilizer: 0.5 parts by weight; The total weight of the core layer components is 72.5 parts.
[0048] (ii) Shell components Bio-based thermoplastic polyurethane: 27 parts by weight; Wax-based lubricating microcapsules: 0.5 parts by weight; The total weight of the shell components is 27.5 parts.
[0049] Example 4 The only difference between this embodiment and Embodiment 1 is that in the S4 core-shell composite melt spinning step, the spinning speed is set to 1500 m / min.
[0050] Example 5 The difference between this embodiment and Embodiment 1 lies only in the preparation step of the S3 shell melt. Bio-based thermoplastic polyurethane and wax-based lubricating microcapsules are premixed before melt plasticization and then added together to a single-screw extruder for melt plasticization. The melt temperature is controlled at 190°C to obtain the shell melt.
[0051] Comparative Example 1 The overall formulation of this comparative composite fiber, based on 100 parts by weight, has the following components and amounts: (a) Core layer components Polypropylene terephthalate: 50 parts by weight; Polyamide 56:20 parts by weight; The total weight of the core layer components is 70 parts.
[0052] (ii) Shell components Bio-based thermoplastic polyurethane: 29.5 parts by weight; Wax-based lubricating microcapsules: 0.5 parts by weight.
[0053] The preparation method is as follows: The polypropylene terephthalate and polyamide 56 in the core layer component were dried separately, premixed, and then melt-blended in a twin-screw extruder at 210℃~240℃ to obtain core layer composite masterbatch particles.
[0054] Subsequently, the core melt and shell melt were prepared according to the same steps as in Example 1, and the coaxial core-shell composite melt spinning process was adopted. Spinning was carried out at a spinning speed of 3000 m / min, and the composite fiber was obtained after stretching and heat setting at 150°C.
[0055] Comparative Example 2 The overall fiber formulation of this comparative example, based on 100 parts by weight, has the following components and amounts: Polypropylene terephthalate: 48 parts by weight; Polyamide 56:20 parts by weight; Cellulose nanocrystals: 2 parts by weight; Maleic anhydride graft compatibilizer: 0.5 parts by weight; Bio-based thermoplastic polyurethane: 29 parts by weight; Wax-based lubricating microcapsules: 0.5 parts by weight.
[0056] The preparation method is as follows: After drying all the above components separately, they are added into a twin-screw extruder at one time and melt-blended at 210℃~240℃ to obtain a uniform blended masterbatch.
[0057] The obtained masterbatch was directly subjected to single-component melt spinning at a spinning speed of 3000 m / min. Subsequently, it was processed under the same draw ratio and heat setting conditions as in Example 1 to obtain blended fibers.
[0058] Comparative Example 3 The overall formulation of the composite fiber described in this comparative example, based on 100 parts by weight, has the following components and amounts: (a) Core layer components Polypropylene terephthalate: 48 parts by weight; Polyamide 56:20 parts by weight; Cellulose nanocrystals: 2 parts by weight; Maleic anhydride graft compatibilizer: 0.5 parts by weight.
[0059] (ii) Shell components Bio-based thermoplastic polyurethane: 29.5 parts by weight.
[0060] The core melt and shell melt were prepared using the same method as in Example 1, and spun using a coaxial core-shell composite melt spinning process. The spinning speed was set to 3000 m / min, followed by stretching and heat setting at 150°C to obtain composite fibers.
[0061] Performance testing 1. Wear resistance test: Abrasion resistance was evaluated using a reciprocating friction and wear test. The test method was modified from the conventional test method for abrasion resistance of textile fibers, as follows: Test equipment: Reciprocating friction and wear test machine Friction mating material: standard alumina ceramic sheet Normal force: 2 N Friction stroke: 10 mm Friction frequency: 2 Hz Test environment: Temperature 23±2 ℃, relative humidity 50±5% Test termination condition: The fiber shows obvious fuzzing, breakage, or wear, and the quality loss tends to stabilize. The mass loss rate (%) of fiber per unit length and the number of abrasion cycles were used as evaluation indicators.
[0062] The test results are shown in Table 1 below.
[0063] Table 1
[0064] 2. Friction performance testing: Friction performance was tested using the constant-load sliding friction coefficient, and the test method is as follows: Test equipment: Fiber friction coefficient tester Contact method: Fiber-ceramic dry friction Normal load: 1 N Sliding speed: 50 mm / min Test environment: 23 ℃, 50% RH Record the average coefficient of kinetic friction (μ) of the fiber during the steady friction phase.
[0065] The test results are shown in Table 2 below.
[0066] Table 2
[0067] 3. Tensile mechanical property testing: Tensile properties were determined using a single-wire tensile test, under the following conditions: Testing equipment: Electronic universal testing machine Clamping length: 20 mm Tensioning speed: 10 mm / min Test environment: 23 ℃, 50% RH.
[0068] The test parameters include breaking strength and elongation at break.
[0069] The test results are shown in Table 3 below.
[0070] Table 3
[0071] 4. Stability and dispersion analysis of wear resistance performance: Example 1 and Comparative Example 2 were selected as representative samples. Ten fiber monofilaments were randomly selected from each sample and tested for the number of wear cycles under the same conditions. The average value and standard deviation were calculated to evaluate the stability of the wear resistance performance.
[0072] The test results are shown in Table 4 below.
[0073] Table 4
[0074] From all the above test results, it can be seen that: Examples 1-3 are significantly better than the comparative examples in terms of wear resistance cycle number and mass loss rate, verifying the effect of the synergistic design of core layer reinforcement bearing and shell layer lubrication on improving wear resistance performance.
[0075] Compared to the comparative examples that do not contain cellulose nanocrystals or do not form a core-shell structure, the fibers in the examples show a significant reduction in the coefficient of friction, indicating that the wax-based lubricating microcapsules can continuously exert a lubricating effect in the shell during friction.
[0076] The fiber in the example exhibits high breaking strength while maintaining a low coefficient of friction, indicating that the introduction of the lubricating phase does not weaken the overall load-bearing capacity of the fiber.
[0077] The standard deviation of wear resistance in the example was significantly lower than that in the comparative example, indicating that stable and controllable wear resistance was achieved through the core-shell structure and process path limitation.
[0078] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.
Claims
1. A highly wear-resistant, green composite functional fiber, characterized in that, The composite functional fiber is a core-shell structure fiber, comprising, by weight: Core layer components: 40-55 parts of polypropylene terephthalate; Polyamide 5615-30 parts; 1-4 parts of cellulose nanocrystals; 0.2–1.5 parts of maleic anhydride graft compatibilizer; Shell components: 20-35 parts of bio-based thermoplastic polyurethane; 0.2–1.0 parts of wax-based lubricating microcapsules; The sum of the weight parts of the core layer component and the shell layer component is 100 parts.
2. The high wear-resistant green composite functional fiber according to claim 1, characterized in that, The weight ratio of the core component to the shell component is 65-75:25-35, and it is prepared using a coaxial core-shell composite melt spinning process at a spinning speed of 2000-4000 m / min.
3. The high wear-resistant green composite functional fiber according to claim 1, characterized in that, In the core layer component, the weight ratio of polypropylene terephthalate to polyamide 56 is 1.5 to 3.5:
1.
4. The high wear-resistant green composite functional fiber according to claim 1, characterized in that, The average particle size of the cellulose nanocrystals is 50–300 nanometers.
5. The high wear-resistant green composite functional fiber according to claim 1, characterized in that, The wax-based lubricating microcapsules have an average particle size of 0.2 to 3 micrometers. The wax-based lubricating microcapsules are made by adding a shell component after the bio-based thermoplastic polyurethane has been completely melted, and the addition process occurs in an independent melt mixing stage before composite spinning.
6. The high wear-resistant green composite functional fiber according to claim 1, characterized in that, Its preparation method includes the following steps: S1. The polypropylene terephthalate, polyamide 56, cellulose nanocrystals and maleic anhydride graft compatibilizer in the core layer component are dried, premixed and melt-blended in a twin-screw extruder to obtain the core layer composite masterbatch. S2. The core layer composite masterbatch is melted and plasticized to obtain a core layer melt with a fixed composition; S3. Melt the bio-based thermoplastic polyurethane in the shell component, add wax-based lubricating microcapsules and mix to obtain the shell melt; S4. Using a coaxial core-shell composite spinning method, the core melt and the shell melt are combined and spun to form a composite initial growth filament; S5. The composite nascent filament is stretched and heat-set to obtain the high wear-resistant green composite functional fiber.
7. The high wear-resistant green composite functional fiber according to claim 6, characterized in that, In step S1, the melt blending is carried out at 200-250°C, and the screw speed of the twin-screw extruder is 200-400 rpm.
8. The high wear-resistant green composite functional fiber according to claim 6, characterized in that, In step S3, the melting temperature of the bio-based thermoplastic polyurethane is 170-210°C, and the wax-based lubricating microcapsules are added and mixed in the molten state.
9. The high wear-resistant green composite functional fiber according to claim 6, characterized in that, In step S5, the total draw ratio is 2.5 to 3.5, and the heat setting temperature is 130 to 170°C.
10. A textile fabric using the high abrasion-resistant green composite functional fiber according to any one of claims 1 to 9, characterized in that, The textile fabric is any one of woven fabric, knitted fabric or nonwoven fabric; The high wear-resistant green composite functional fiber exists in textile fabrics either as a single fiber or as a blend with other textile fibers.