Fiber for activating biomolecule activity and relieving varicosity and preparation method thereof

Abstract

The invention discloses a varicosity relieving fiber for activating biomolecule activity and a preparation method, and relates to the technical field of high-performance polyamide fibers. According to the invention, a composite spinning method is adopted, and particles with a far infrared heating function and a negative ion release function are added into spinning master batches, so that the fiber with varicosity relieving performance is prepared. During preparation, the functional particles are pretreated in advance to enhance compatibility, then the pretreated functional particles and the modified aluminum oxide particles are added into a nylon raw material to be mixed to prepare nylon functional master batches, and nylon slices and the master batches are prepared into fibers through melt spinning. Li < + > is doped in the modified aluminum oxide particles, and lattice distortion of the aluminum oxide particles can be realized, so that the far infrared radiation effect is improved, and the heating performance of the varicosity relieving fiber is enhanced.

Description

Technical Field

[0001] This application belongs to the field of high-performance nylon fiber technology, specifically relating to a fiber that activates biomolecular activity to alleviate varicose veins and its preparation method. Background Technology

[0002] With the progress of modern society, people are paying increasing attention to sub-health, especially with the expansion of the sedentary office population. Problems such as varicose veins, joint pain, and peripheral circulation disorders are prevalent. People's demand for textiles has evolved from simply keeping warm to dressing healthily, hoping that textiles can help improve circulation and alleviate problems like varicose veins through physical effects. Therefore, far-infrared textiles have emerged. Far-infrared textiles refer to functional textiles that, through material design or functional modification, possess the ability to absorb energy and emit infrared radiation. Their core characteristic is the stable emission of far-infrared wavelengths of 4-14μm, thereby promoting blood circulation, accelerating metabolism, and improving overall health. Nylon fiber, also known as polyvinyl chloride fiber, has excellent mechanical and elastic properties. Current technology often involves composite spinning of far-infrared particles with nylon masterbatch to prepare far-infrared fibers, which are then used to weave far-infrared textiles. Besides far-infrared textiles, particles with negative ion release functions can also be added to fibers or fabrics to promote blood circulation. In existing processes, far-infrared fabrics can be prepared by weaving far-infrared fibers or by directly coating existing fabrics. Blended spinning involves mixing nanoparticles with far-infrared emission capabilities with a fiber matrix material to create a masterbatch, which is then spun into far-infrared fibers. For example, Chinese patent application CN102732999A discloses a negative ion far-infrared composite functional fiber. This fiber employs a core-sheath structure, with the sheath being a polymer sheath containing far-infrared ceramic powder and tourmaline powder, and the core being a polymer core containing tourmaline powder. Because this fiber uses a core-sheath composite structure, and the functional substances far-infrared ceramic powder and tourmaline powder are respectively mixed in the sheath and core layers of the fiber, it can effectively solve the problem of interference caused by the blending of substances with different mechanisms of action, thereby improving the actual functional performance of far-infrared fabrics.

[0003] Current technologies for preparing far-infrared fibers typically employ composite spinning, which integrates functional particles into the fiber, preventing their shedding. However, to ensure the fiber's mechanical properties, the amount of functional particles added is limited, resulting in a relatively low far-infrared heating power. Therefore, developing and designing a fiber with improved far-infrared radiation performance is an urgent problem to be solved. Summary of the Invention

[0004] To address the problems existing in the prior art, the primary objective of this application is to provide a fiber that activates biomolecular activity to alleviate varicose veins and a method for its preparation. Through composite spinning technology, particles with far-infrared heating and negative ion release functions are added to the spinning masterbatch to obtain a fiber with varicose vein-relieving function. Furthermore, to enhance the far-infrared heating performance of the fiber, MOF (metal-organic framework) pyrolysis-derived carbon materials are used to coat far-infrared particles and simultaneously achieve ion doping. The porous structure of the derived carbon improves compatibility and specific surface area, while the doped ions optimize the far-infrared energy level, thereby enhancing the far-infrared heating performance.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] In a first aspect, this application provides a varicose vein relief fiber that activates the activity of biomolecules, characterized in that the fiber is obtained by melt spinning a mixture of nylon functional masterbatch and nylon chips; the nylon functional masterbatch is obtained by granulation of a mixture of nylon raw materials, functional particles and modified Al2O3 particles;

[0007] Preferably, the functional particles include any one or more of nano-SiO2, nano-Fe2O3, nano-TiO2, nano-MgO, nano-ZrO2, nano-tourmaline, and nano-montmorillonite;

[0008] It should be noted that among the functional particles, the nano-tourmaline particles and nano-montmorillonite particles are negative ion releasing particles, while the rest are far-infrared particles. When stimulated by heat from the human body, these far-infrared particles emit far-infrared rays in the range of 4-14 μm. This wavelength of far-infrared rays resonates with human molecules, causing an increase in subcutaneous tissue temperature, leading to capillary dilation and accelerated blood circulation. When subjected to heat, friction, or pressure in the environment, the negative ion releasing particles continuously release high concentrations of negative air ions (such as OH-). - O2 - Negative ions can improve cell membrane potential, purify blood, reduce blood viscosity, and alleviate the tension of blood vessel walls, thereby helping to unclog blood vessels.

[0009] Preferably, the particle size range of the functional particles is 10~500nm.

[0010] Secondly, this application provides a method for preparing varicose vein relief fibers that activate biomolecular activity, comprising the following steps:

[0011] The functional particles are preprocessed to obtain preprocessed functional particles;

[0012] Modified Al2O3 particles were obtained by modifying nano-Al2O3 particles.

[0013] Pretreated functional particles and modified Al2O3 particles are mixed with nylon raw materials and melt-granulated to obtain nylon functional masterbatch;

[0014] Nylon functional masterbatch is mixed with nylon chips and melt-spun to obtain varicose vein relief fibers.

[0015] Preferably, the method for preparing the pretreated functional particles is as follows:

[0016] Add the silane coupling agent to anhydrous ethanol and stir at 20-30 rpm for 10-20 min to obtain a mixed modifier;

[0017] Take the dried functional particles, add them to a mixer, and rotate the mixer at 500~1200 rpm. Then add the mixing modifier to the mixer in the form of a spray, continue stirring, and heat to 50~60℃. React for 30~60 minutes, and then cool naturally to room temperature to obtain pretreated functional particles.

[0018] Preferably, the mass ratio of the silane coupling agent, anhydrous ethanol, and functional particles is (0.5~2):(3~5):100; the silane coupling agent includes any one of KH-570 and KH-550.

[0019] It should be noted that the functional particles are modified by silane coupling agents to graft organic groups onto the surface of the functional particles, thereby improving their compatibility with the fiber matrix and preventing aggregation.

[0020] Preferably, the modified Al2O3 particles are prepared by:

[0021] Nano-Al2O3 particles were added to DMF (N,N-dimethylformamide) solvent and ultrasonically dispersed for 20-30 min to form a uniform suspension. Zn(NO3)2·6H2O and terephthalic acid were added, and the mixture was stirred at 500-600 r / min at room temperature for 60-80 min. The mixture was then transferred to a hydrothermal reactor, heated to 110-120℃, and reacted at a constant temperature for 10-12 h. After naturally cooling to room temperature, the mixture was filtered to obtain Zn-MOF-coated particles. The mass ratio of N,N-dimethylformamide solvent, nano-Al2O3 particles, Zn(NO3)2·6H2O, and terephthalic acid was 100:(4.5-5.5):(4-4.5):(2-2.4).

[0022] It should be noted that ultrasonic dispersion can utilize high-frequency vibration to break up the aggregation of nano-Al2O3 particles, ensuring that the particles are uniformly dispersed in the solvent, laying the foundation for subsequent uniform MOF coating; under hydrothermal conditions, Zn 2+A coordination reaction occurs with terephthalic acid to generate Zn-MOF material in situ. The MOF material has a porous structure and can be tightly coated on the surface of nano-Al2O3 particles through intermolecular forces to form a preliminary core-shell structure. At the same time, the porosity of MOF can increase the specific surface area of ​​the particles in advance, preparing for ion doping and improved compatibility.

[0023] The obtained Zn-MOF-coated particles were washed three times alternately with DMF and anhydrous ethanol, and then dried under vacuum at 60 °C for 2 h. The dried particles were mixed with LiNO3 at a mass ratio of (9~10):1 and placed in a tube furnace. Nitrogen gas was introduced at a flow rate of 50 mL / min. After purging the air from the furnace, the temperature was increased to 550~600 °C at a rate of 4~5 °C / min and pyrolyzed at this temperature for 2~3 h. Subsequently, the temperature was lowered to room temperature at a rate of 2~3 °C / min to obtain Li. + Doped MOF-derived carbon-far-infrared particle core-shell composite particles;

[0024] It should be noted that after LiNO3 and MOF-coated particles are mixed evenly, LiNO3 decomposes to produce Li during the pyrolysis process. + Because MOFs form porous structures during pyrolysis, Li + Li can be readily embedded in the interfacial gap between derived carbon and far-infrared particles. + As a dopant ion, it can adjust the electronic energy level structure of far-infrared particles and reduce the electronic transition energy barrier, thereby enhancing the absorption and emission capabilities of particles for far-infrared light; the nitrogen atmosphere can prevent the particles from being oxidized during high-temperature pyrolysis, avoiding the decay of far-infrared performance; isothermal pyrolysis can completely convert Zn-MOF into porous derived carbon, and the porous structure of the derived carbon can increase the contact area between the particles and the fiber matrix, providing a structural basis for subsequent compatibility improvement.

[0025] The composite particles were placed in a 1 mol / L hydrochloric acid solution and stirred at 300-400 r / min at room temperature for 30-40 min. They were then washed with deionized water until neutral, dried under vacuum at 80℃ for 4-5 h, pulverized, and passed through a 200-mesh sieve to obtain the final modified Al2O3 particles.

[0026] It should be noted that soaking in hydrochloric acid can remove residual LiNO3 impurities and unreacted Zn from the pyrolysis process. 2 + To avoid impurities affecting the far-infrared properties of the particles and their compatibility with the fiber matrix; washing with deionized water to neutrality can prevent hydrochloric acid residue from corroding the particle surface and ensure the stability of the particle structure.

[0027] Preferably, the specific preparation steps of the nylon functional masterbatch are as follows: pretreated functional particles and modified Al2O3 particles are added to nylon raw materials, melt-mixed in a twin-screw extruder, the extrusion temperature is 260~280℃, the screw speed is 200r / min, and the nylon functional masterbatch is obtained by extrusion granulation.

[0028] Preferably, the mass ratio of the nylon raw material, pretreated functional particles and modified Al2O3 particles is 100:(2~4):(3~5); the mass ratio of the nylon functional masterbatch and nylon chips is (10~20):(80~90).

[0029] Preferably, the specific parameters of the melt spinning are as follows: extrusion screw temperature is 270~280℃, metering pump speed is 30~32r / min, spinneret temperature is 270~280℃, side blowing air temperature is 22~24℃, air speed is 0.9~1.2m / s, the oil agent type is antistatic oil agent, and the winding speed is 1000~1200m / min.

[0030] It should be noted that by reasonably controlling the spinning parameters, the uniformity of the fibers can be adjusted to avoid the situation where the cortex is too thin or too thick, and the distribution uniformity of functional particles can be regulated.

[0031] The beneficial effects of this application are:

[0032] This application utilizes Zn 2+ A coordination reaction occurs with terephthalic acid, generating Zn-MOF material in situ. Under intermolecular forces, the Zn-MOF material coats the surface of nano-Al2O3 particles, forming a core-shell structure. Then, after mixing with LiNO3 and undergoing pyrolysis, the Zn-MOF material forms a porous structure during pyrolysis. + Li can be embedded in the interfacial gap between Zn-MOF materials and far-infrared particles. + The embedding of [Li] enhances the intrinsic dipole moment of nano-Al2O3 particles, increasing their infrared absorption and emission cross-sections, thereby improving their far-infrared heating capability. Simultaneously, Li [Li] + Doping can introduce impurity energy levels into the particle band gap, making it easier for electrons to transition between energy levels, thereby increasing the conversion rate of thermal energy into far-infrared radiation and thus improving far-infrared heating performance. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1A flowchart illustrating a method for preparing varicose vein relief fibers that activate biomolecular activity, as provided in this application. Detailed Implementation

[0035] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0036] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0037] The following specific embodiments further illustrate this point:

[0038] Example 1

[0039] like Figure 1 As shown, a method for preparing bioactive varicose vein relieving fibers includes the following steps:

[0040] 1. Add KH-550 silane coupling agent to anhydrous ethanol and stir at 30 rpm for 20 min to obtain a mixed modifier; take the dried functional particles and add them to a mixer. Add the mixed modifier to the mixer in the form of a spray at 1200 rpm, continue stirring, and heat to 60℃. React for 60 min and allow to cool naturally to room temperature to obtain pretreated functional particles. The mass ratio of KH-550 silane coupling agent, anhydrous ethanol and functional particles is 2:5:100. The particle size range of the functional particles is 10~500 nm. The functional particles contain 40% nano ZrO2, 15% nano Fe2O3, 15% nano TiO2 and 30% montmorillonite nanoparticles by mass fraction.

[0041] 2. Take nano-Al2O3 particles, add them to DMF solvent, and ultrasonically disperse them for 20 min to form a uniform suspension. Add Zn(NO3)2·6H2O and terephthalic acid, stir at 500 r / min at room temperature for 60 min, transfer the mixture to a hydrothermal reactor, heat to 110℃, and react at a constant temperature for 10 h. After naturally cooling to room temperature, filter to obtain Zn-MOF coated particles; the mass ratio of DMF, nano-Al2O3 particles, Zn(NO3)2·6H2O and terephthalic acid is 100:4.5:4:2.

[0042] The obtained Zn-MOF-coated particles were washed three times alternately with DMF and anhydrous ethanol, and then dried under vacuum at 60 °C for 2 h. The dried particles were mixed with LiNO3 at a mass ratio of 9:1 and placed in a tube furnace. Nitrogen gas was introduced at a flow rate of 50 mL / min. After purging the air from the furnace, the temperature was increased to 550 °C at a rate of 4 °C / min and pyrolyzed at this temperature for 2 h. Subsequently, the temperature was lowered to room temperature at a rate of 2 °C / min to obtain Li. + Doped MOF-derived carbon-far-infrared particle core-shell composite particles;

[0043] The composite particles were placed in a 1 mol / L hydrochloric acid solution and stirred at 300 r / min at room temperature for 30 min. They were then washed with deionized water until neutral, dried under vacuum at 80℃ for 4 h, pulverized, and passed through a 200-mesh sieve to obtain the final modified Al2O3 particles.

[0044] 3. Add the pretreated functional particles and modified Al2O3 particles to the nylon raw material, melt mix them in a twin-screw extruder, the extrusion temperature is 260℃, the screw speed is 200r / min, and the nylon functional masterbatch is obtained by extrusion granulation.

[0045] 4. Add nylon functional masterbatch and nylon chips to a screw extruder, set the extrusion screw temperature to 270℃, the metering pump speed to 30r / min, and the spinneret temperature to 270℃, melt and extrude the fiber bundle, cool it with side blowing air at a temperature of 22℃ and a wind speed of 0.9m / s, then apply an antistatic oil agent, and then wind it at a speed of 1000m / min to obtain activated biomolecular active varicose vein relief fiber.

[0046] In step 3 above, the mass ratio of the nylon raw material, pretreated functional particles, and modified Al2O3 particles is 100:2:3; the mass ratio of the nylon functional masterbatch and nylon chips is 20:80.

[0047] Example 2

[0048] like Figure 1 As shown, a method for preparing varicose vein relief fibers that activate biomolecular activity includes the following steps:

[0049] 1. Add KH-550 silane coupling agent to anhydrous ethanol and stir at 20 rpm for 10 min to obtain a mixed modifier; take the dried functional particles and add them to a mixer. At 1000 rpm, add the mixed modifier to the mixer in the form of a spray, continue stirring, and heat to 50℃. React for 50 min and cool naturally to room temperature to obtain pretreated functional particles. The mass ratio of KH-550 silane coupling agent, anhydrous ethanol and functional particles is 0.5:3:100. The particle size range of the first functional particles is 10~500 nm. The functional particles contain 30% nano-SiO2, 20% nano-Fe2O3, 20% nano-MgO and 30% tourmaline nanoparticles by mass fraction.

[0050] 2. Take nano-Al2O3 particles, add them to DMF solvent, and ultrasonically disperse them for 25 min to form a uniform suspension. Add Zn(NO3)2·6H2O and terephthalic acid, stir at 550 r / min at room temperature for 70 min, transfer the mixture to a hydrothermal reactor, heat to 115℃, and react at a constant temperature for 11 h. After naturally cooling to room temperature, filter to obtain Zn-MOF coated particles. The mass ratio of DMF, nano-Al2O3 particles, Zn(NO3)2·6H2O and terephthalic acid is 100:5:4.2:2.2.

[0051] The obtained Zn-MOF-coated particles were washed three times alternately with DMF and anhydrous ethanol, and then dried under vacuum at 60 °C for 2 h. The dried particles were mixed with LiNO3 at a mass ratio of 9.5:1 and placed in a tube furnace. Nitrogen gas was introduced at a flow rate of 50 mL / min. After purging the air from the furnace, the temperature was increased to 575 °C at a rate of 4.5 °C / min and pyrolyzed at this temperature for 2.5 h. Subsequently, the temperature was lowered to room temperature at a rate of 2.5 °C / min to obtain Li. + Doped MOF-derived carbon-far-infrared particle core-shell composite particles;

[0052] The composite particles were placed in a 1 mol / L hydrochloric acid solution and stirred at 350 r / min for 35 min at room temperature. They were then washed with deionized water until neutral, dried under vacuum at 80℃ for 4.5 h, pulverized, and passed through a 200-mesh sieve to obtain the final modified Al2O2 particles.

[0053] 3. Add the pretreated functional particles and modified Al2O3 particles to the nylon raw material, melt mix them in a twin-screw extruder, the extrusion temperature is 270℃, the screw speed is 200r / min, and the nylon functional masterbatch is obtained by extrusion granulation.

[0054] 4. Add nylon functional masterbatch and nylon chips to a screw extruder, set the extrusion screw temperature to 275℃, the metering pump speed to 31r / min, and the spinneret temperature to 275℃, melt and extrude the fiber bundle, cool it with side blowing air at a temperature of 23℃ and a wind speed of 1m / s, then apply an antistatic oil agent, and then wind it at a speed of 1100m / min to obtain activated biomolecular active varicose vein relief fiber.

[0055] In step 3 above, the mass ratio of the nylon raw material, pretreated functional particles, and modified Al2O3 particles is 100:3:4; the mass ratio of the nylon functional masterbatch and nylon chips is 15:85.

[0056] Example 3

[0057] like Figure 1 As shown, a method for preparing varicose vein relief fibers that activate biomolecular activity includes the following steps:

[0058] 1. Add KH-570 silane coupling agent to anhydrous ethanol and stir at 30 rpm for 15 min to obtain a mixed modifier; take the dried functional particles and add them to a mixer. At 1000 rpm, add the mixed modifier to the mixer in the form of a spray, continue stirring, and heat to 50℃. React for 40 min and then cool naturally to room temperature to obtain pretreated functional particles. The mass ratio of KH-570 silane coupling agent, anhydrous ethanol and functional particles is 1:3:100. The particle size range of the functional particles is 10~500 nm. The functional particles contain 30% nano-SiO2, 20% nano-Fe2O3, 20% nano-MgO and 30% montmorillonite nanoparticles by mass fraction.

[0059] 2. Take nano-Al2O3 particles, add them to DMF solvent, and ultrasonically disperse them for 30 min to form a uniform suspension. Add Zn(NO3)2·6H2O and terephthalic acid, stir at 600 r / min at room temperature for 80 min, transfer the mixture to a hydrothermal reactor, heat to 120℃, and react at a constant temperature for 12 h. After naturally cooling to room temperature, filter to obtain Zn-MOF coated particles. The mass ratio of DMF, nano-Al2O3 particles, Zn(NO3)2·6H2O and terephthalic acid is 100:5.5:4.5:2.4.

[0060] The obtained Zn-MOF-coated particles were washed three times alternately with DMF and anhydrous ethanol, and then dried under vacuum at 60 °C for 2 h. The dried particles were mixed with LiNO3 at a mass ratio of 10:1 and placed in a tube furnace. Nitrogen gas was introduced at a flow rate of 50 mL / min. After purging the air from the furnace, the temperature was increased to 600 °C at a rate of 5 °C / min and pyrolyzed at this temperature for 3 h. Subsequently, the temperature was lowered to room temperature at a rate of 3 °C / min to obtain Li.+ Doped MOF-derived carbon-far-infrared particle core-shell composite particles;

[0061] The composite particles were placed in a 1 mol / L hydrochloric acid solution and stirred at 400 r / min for 40 min at room temperature. They were then washed with deionized water until neutral, dried under vacuum at 80℃ for 5 h, pulverized, and passed through a 200-mesh sieve to obtain the final modified Al2O3 particles.

[0062] 3. Add the pretreated functional particles and modified Al2O3 particles to the nylon raw material, melt mix them in a twin-screw extruder, the extrusion temperature is 280℃, the screw speed is 200r / min, and the nylon functional masterbatch is obtained by extrusion granulation.

[0063] 4. Add nylon functional masterbatch and nylon chips to a screw extruder, set the extrusion screw temperature to 280℃, the metering pump speed to 32r / min, and the spinneret temperature to 280℃, melt and extrude the fiber bundle, cool it with side blowing air at a temperature of 24℃ and a wind speed of 1.2m / s, then apply an antistatic oil agent, and then wind it at a speed of 1200m / min to obtain activated biomolecular active varicose vein relief fiber.

[0064] In step 3 above, the mass ratio of the nylon raw material, pretreated functional particles, and modified Al2O3 particles is 100:4:5; the mass ratio of the nylon functional masterbatch and nylon chips is 10:90.

[0065] Example 4

[0066] like Figure 1 As shown, a method for preparing varicose vein relief fibers that activate biomolecular activity includes the following steps:

[0067] 1. Add KH-570 silane coupling agent to anhydrous ethanol and stir at 30 rpm for 15 min to obtain a mixed modifier; take the dried functional particles and add them to a mixer. Add the mixed modifier to the mixer in the form of a spray at 1000 rpm, continue stirring, and heat to 50℃. React for 40 min and cool naturally to room temperature to obtain pretreated functional particles. The mass ratio of KH-570 silane coupling agent, anhydrous ethanol and functional particles is 1:4:100. The particle size range of the functional particles is 10~500 nm. The functional particles contain 30% nano ZrO2, 15% nano Fe2O3, 8% nano TiO2, 12% nano MgO and 35% montmorillonite nanoparticles by mass fraction.

[0068] 2. Take nano-Al2O3 particles, add them to DMF solvent, and ultrasonically disperse them for 20 min to form a uniform suspension. Add Zn(NO3)2·6H2O and terephthalic acid, stir at 600 r / min at room temperature for 60 min, transfer the mixture to a hydrothermal reactor, heat to 110℃, and react at a constant temperature for 10 h. After naturally cooling to room temperature, filter to obtain Zn-MOF coated particles. The mass ratio of DMF, nano-Al2O3 particles, Zn(NO3)2·6H2O and terephthalic acid is 100:5.5:4:2.

[0069] The obtained Zn-MOF-coated particles were washed three times alternately with DMF and anhydrous ethanol, and then dried under vacuum at 60 °C for 2 h. The dried particles were mixed with LiNO3 at a mass ratio of 10:1 and placed in a tube furnace. Nitrogen gas was introduced at a flow rate of 50 mL / min. After purging the air from the furnace, the temperature was increased to 550 °C at a rate of 5 °C / min and pyrolyzed at this temperature for 2 h. Subsequently, the temperature was lowered to room temperature at a rate of 3 °C / min to obtain Li. + Doped MOF-derived carbon-far-infrared particle core-shell composite particles;

[0070] The composite particles were placed in a 1 mol / L hydrochloric acid solution and stirred at 400 r / min for 30 min at room temperature. They were then washed with deionized water until neutral, dried under vacuum at 80℃ for 5 h, pulverized, and passed through a 200-mesh sieve to obtain the final modified Al2O3 particles.

[0071] 3. Add the pretreated functional particles and modified Al2O3 particles to the nylon raw material, melt mix them in a twin-screw extruder, the extrusion temperature is 260℃, the screw speed is 200r / min, and the nylon functional masterbatch is obtained by extrusion granulation.

[0072] 4. Add nylon functional masterbatch and nylon chips to a screw extruder, set the extrusion screw temperature to 280℃, the metering pump speed to 32r / min, and the spinneret temperature to 280℃, melt and extrude the fiber bundle, cool it with side blowing air at a temperature of 24℃ and a wind speed of 1.2m / s, then apply an antistatic oil agent, and then wind it at a speed of 1200m / min to obtain activated biomolecular active varicose vein relief fiber.

[0073] In step 3 above, the mass ratio of the nylon raw material, pretreated functional particles, and modified Al2O3 particles is 100:4:5; the mass ratio of the nylon functional masterbatch and nylon chips is 15:85.

[0074] Comparative Example 1

[0075] Comparative Example 1 provides a method for preparing varicose vein relief fibers that activate biomolecular activity. The difference from Example 1 is that the nano-Al2O3 particles are not modified during the preparation process. The remaining steps are the same as in Example 1 and will not be repeated here.

[0076] Comparative Example 2

[0077] Comparative Example 2 provides a method for preparing varicose vein relief fibers that activate biomolecular activity. The difference from Example 1 is that no functional particles are added to the masterbatch during the preparation process. The remaining steps are the same as in Example 1 and will not be repeated here.

[0078] To demonstrate the far-infrared radiation effect of the varicose vein relief fibers provided in Examples 1-4 and Comparative Examples 1-2, they were woven into fabrics, and far-infrared lamps and temperature measuring devices were used to test the far-infrared radiation temperature rise of the varicose vein relief fabrics provided in Examples 1-4 and Comparative Examples 1-2.

[0079] Table 1. Far-infrared radiation temperature rise test results of the varicose vein relief fabrics provided in each embodiment and comparative example.

[0080] sample Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Temperature rise / °C 3.6 3.2 3.8 3.5 2.1 2.2

[0081] As shown in Table 1, Examples 1-4 exhibit superior far-infrared radiation temperature rise performance compared to Comparative Examples 1-2. Since Comparative Example 1 did not modify the nano-alumina particles, its far-infrared heating performance was not improved. However, the fabrics made from the fibers in the modified examples all showed improved far-infrared heating performance, indicating that modification treatment does indeed help improve the far-infrared heating performance of nano-alumina particles. Comparative Example 2 did not add functional particles to the masterbatch, which weakened the fiber's far-infrared heating capability. This is mainly because a single type of far-infrared heating particle cannot fully cover the 4-14μm far-infrared band, resulting in weakened far-infrared heating performance. Therefore, adding multiple far-infrared particles to the masterbatch is necessary. In summary, the varicose vein relief fiber prepared in this application has excellent far-infrared heating effect and can achieve varicose vein relief function.

[0082] It should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application, and all such modifications and substitutions should be covered within the scope of the claims of this application.

Claims

1. A varicose vein relief fiber that activates biomolecular activity, characterized in that, The fiber is obtained by melt spinning a mixture of nylon functional masterbatch and nylon chips; the nylon functional masterbatch is obtained by granulation of a mixture of nylon raw material, functional particles and modified Al2O3 particles.

2. The varicose vein relief fiber that activates biomolecular activity according to claim 1, characterized in that, The functional particles include any one or more of nano-SiO2, nano-Fe2O3, nano-TiO2, nano-MgO, nano-ZrO2, nano-tourmaline, and nano-montmorillonite.

3. The varicose vein relief fiber that activates biomolecular activity according to claim 1, characterized in that, The particle size range of the functional particles is 10~500nm.

4. A method for preparing the varicose vein relief fiber with activated biomolecular activity according to any one of claims 1-3, characterized in that, Includes the following steps: The functional particles are preprocessed to obtain preprocessed functional particles; Modified Al2O3 particles were obtained by modifying nano-Al2O3 particles. Pretreated functional particles and modified Al2O3 particles are mixed with nylon raw materials and melt-granulated to obtain nylon functional masterbatch; Nylon functional masterbatch is mixed with nylon chips and melt-spun to obtain varicose vein relief fibers.

5. The method for preparing a varicose vein relief fiber that activates biomolecular activity according to claim 4, characterized in that, The method for preparing the pretreated functional particles is as follows: Add the silane coupling agent to anhydrous ethanol and stir at 20-30 rpm for 10-20 min to obtain a mixed modifier; Take the dried functional particles, add them to a mixer, and rotate the mixer at 500~1200 rpm. Then add the mixing modifier to the mixer in the form of a spray, continue stirring, and heat to 50~60℃. React for 30~60 minutes, and then cool naturally to room temperature to obtain pretreated functional particles.

6. The method for preparing a varicose vein relief fiber that activates biomolecular activity according to claim 5, characterized in that, The mass ratio of the silane coupling agent, anhydrous ethanol, and functional particles is (0.5~2):(3~5):100; the silane coupling agent includes either KH-570 or KH-550.

7. The method for preparing a varicose vein relief fiber that activates biomolecular activity according to claim 4, characterized in that, The method for preparing the modified Al2O3 particles is as follows: Nano-Al2O3 particles were added to DMF solvent and ultrasonically dispersed for 20-30 min to form a uniform suspension. Zn(NO3)2·6H2O and terephthalic acid were added, and the mixture was stirred at 500-600 r / min at room temperature for 60-80 min. The mixture was then transferred to a hydrothermal reactor, heated to 110-120℃, and reacted at a constant temperature for 10-12 h. After naturally cooling to room temperature, the mixture was filtered to obtain Zn-MOF-coated particles. The mass ratio of DMF, nano-Al2O3 particles, Zn(NO3)2·6H2O, and terephthalic acid was 100:(4.5-5.5):(4-4.5):(2-2.4). The obtained Zn-MOF coated particles were washed three times alternately with DMF and anhydrous ethanol, and dried under vacuum at 60℃ for 2h. The dried particles were mixed with LiNO3 at a mass ratio of (9~10):1 and placed in a tube furnace. Nitrogen gas was introduced and the flow rate of nitrogen was controlled at 50mL / min. After the air in the furnace was removed, the temperature was raised to 550~600℃ at a heating rate of 4~5℃ / min and pyrolyzed at a constant temperature for 2~3h. Then, the temperature was lowered to room temperature at a cooling rate of 2~3℃ / min to obtain Li⁺-doped MOF-derived carbon-far-infrared particle core-shell composite particles. The composite particles were placed in a 1 mol / L hydrochloric acid solution and stirred at 300-400 r / min at room temperature for 30-40 min. They were then washed with deionized water until neutral, dried under vacuum at 80℃ for 4-5 h, pulverized, and passed through a 200-mesh sieve to obtain the final modified Al2O3 particles.

8. The method for preparing a varicose vein relief fiber that activates biomolecular activity according to claim 4, characterized in that, The specific preparation steps of the nylon functional masterbatch are as follows: pretreated functional particles and modified Al2O3 particles are added to nylon raw materials, melt-mixed in a twin-screw extruder, the extrusion temperature is 260~280℃, the screw speed is 200r / min, and the nylon functional masterbatch is obtained by extrusion granulation.

9. The method for preparing a varicose vein relief fiber that activates biomolecular activity according to claim 8, characterized in that, The mass ratio of the nylon raw material, pretreated functional particles and modified Al2O3 particles is 100:(2~4):(3~5); the mass ratio of the nylon functional masterbatch and nylon chips is (10~20):(80~90).

10. The method for preparing a varicose vein relief fiber that activates biomolecular activity according to claim 4, characterized in that, The specific parameters for melt spinning are as follows: extrusion screw temperature is 270~280℃, metering pump speed is 30~32r / min, spinneret temperature is 270~280℃, side blowing temperature is 22~24℃, wind speed is 0.9~1.2m / s, the oiling agent is an antistatic oiling agent, and the winding speed is 1000~1200m / min.

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