An anti-yellowing polyethylene fiber and a method for preparing the same

Abstract

The application provides an anti-yellowing polyethylene fiber and a preparation method thereof, and comprises the following steps: S1, a certain weight percentage of a silane coupling agent and chitosan are taken, blended and ball milled to obtain uniform nanometer powder, the powder is added into an organic solvent, ultrasonic dispersion is carried out, a catalyst is added for grafting reaction, and drying is carried out to obtain an anti-yellowing material; S2, the anti-yellowing material is mixed with polyethylene chips to obtain a composite material; wherein the mass of the anti-yellowing material accounts for 1%-5% of the mass of the polyethylene chips; S3, the composite material of S2 is melt blended at a certain temperature, and is spun to form a fiber tow; S4, post-treatment is carried out on the fiber tow to obtain the anti-yellowing polyethylene fiber. The Si-O-Si crosslinking network formed by the unique silane coupling agent can effectively capture free radicals, inhibit PE ultraviolet light oxidation chain reaction, and effectively solve the PE yellowing phenomenon, and the obtained polyethylene fiber is durable and efficient in function, and can be widely applied in outdoor clothing and other fields.

Description

Technical Field

[0001] This invention relates to the field of functional chemical fiber preparation technology, and in particular to an anti-yellowing polyethylene fiber and its preparation method. Background Technology

[0002] Polyethylene fiber has a mature production process, low cost, and huge output, making it one of the fundamental members of the synthetic fiber family. However, traditional polyethylene fiber is prone to yellowing during storage and use, especially when exposed to outdoor environments. Yellowing is essentially a direct manifestation of photo-oxidative aging and thermo-oxidative aging, which seriously affects the appearance and service life of its products.

[0003] The tertiary carbon atoms and terminal unsaturated bonds in the polyethylene molecule are chemical weaknesses. Under the influence of light (especially ultraviolet light) or heat, oxygen attacks these weaknesses, triggering free radical chain reactions that lead to molecular chain breakage or cross-linking. This process generates various chromophores and auxochromes containing carbonyl groups (such as ketones and aldehydes) and carboxyl groups. These groups absorb light in the visible region, resulting in a color change from light yellow to dark brown. Ultraviolet light from sunlight is the primary energy source for yellowing, providing the energy needed to break chemical bonds in polyethylene molecules and greatly accelerating the oxidation process. Unstabilized polyethylene fibers will show noticeable yellowing after being exposed to outdoor sunlight for several weeks to months.

[0004] Therefore, developing a high-performance polyethylene fiber that is durable and resistant to yellowing has become a pressing technical problem to be solved in this field. Summary of the Invention

[0005] To address the aforementioned issues, this invention provides an anti-yellowing polyethylene fiber and its preparation method. Through a unique nanoparticle pretreatment process and an optimized melt spinning process, various functional nanoparticles are uniformly dispersed within the fiber via blend spinning, resulting in a polyethylene fiber with both excellent anti-yellowing and mechanical properties.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A method for preparing anti-yellowing polyethylene fiber includes the following steps:

[0008] S1. Preparation of anti-yellowing material: Weigh silane coupling agent and chitosan according to a certain weight ratio, mix them, and ball mill them to obtain uniform nanopowder; add the uniform nanopowder to an organic solvent, disperse it by ultrasonic vibration, add a catalyst to make the two undergo a grafting reaction, and dry it to obtain anti-yellowing material.

[0009] S2. Blending: The anti-yellowing material prepared in step S1 is blended with polyethylene chips to obtain a composite material; wherein the mass of the anti-yellowing material in the composite material accounts for 1%-5% of the mass of the polyethylene chips;

[0010] S3, Melting: The composite material after blending in step S2 is melted and blended at a certain temperature, and then subjected to vigorous shearing and stirring to form a spinning solution. Spinning is then performed to form fiber bundles.

[0011] S4. Post-process the fiber bundles to obtain anti-yellowing polyethylene fibers.

[0012] In one embodiment of the present invention, the silane coupling agent is 2-10 parts by weight, and the chitosan is 1-10 parts by weight.

[0013] Preferably, the silane coupling agent is 4-6 parts by weight, and the chitosan is 2-5 parts by weight.

[0014] In one embodiment of the present invention, the organic solvent in step S1 is acetone solution, ethanol or tetrahydrofuran.

[0015] Pretreatment and ultrasonic dispersion of nanoparticles using organic solvents, especially acetone solution, can effectively break the initial agglomeration of nanoparticles. Then, through the high temperature and high shear of the screw extruder, uniform dispersion of nanoparticles in polyethylene melt is achieved, avoiding spinneret clogging and filament breakage, resulting in excellent spinnability.

[0016] In one embodiment of the present invention, the silane coupling agent is selected from one or more of KH-550, KH-560, and KH570.

[0017] In one embodiment of the present invention, the catalyst is selected from stannous octoate or 1,8-diazabicyclo[5.4.0]undec-7-ene.

[0018] In one embodiment of the present invention, the chitosan is carboxymethyl chitosan.

[0019] In one embodiment of the present invention, in step S2, the anti-yellowing material contained in the composite material accounts for 2% to 3% of the mass of the polyethylene chips, preferably 2.5% to 3%.

[0020] In one embodiment of the present invention, in step S3, the composite material after blending in step S2 is fed into a screw extruder and melt-blended at a temperature of 250°C-270°C, and then subjected to vigorous shearing and stirring to obtain a spinning solution.

[0021] In one embodiment of the present invention, the screw extruder has 6 zones, and the temperature ranges are set to 205℃~215℃, 215℃~225℃, 225℃~235℃, 235℃~250℃, 245℃~260℃ and 250℃~270℃.

[0022] In one embodiment of the present invention, in step S3, the spinning solution is precisely metered by a metering pump and then extruded by a spinneret to form fiber bundles; the surface temperature of the spinneret is controlled between 250°C and 270°C, and the number of spinneret holes is 24 to 144.

[0023] In one embodiment of the present invention, the post-processing in step S4 includes: cooling, oiling, pre-networking, stretching and shaping, main networking and winding processes of the fiber bundle to obtain anti-yellowing polyethylene fiber.

[0024] In one embodiment of the present invention, the cooling process uses a hot air device to perform ring-blowing cooling on the fiber bundle, and then uses polyethylene oil to perform double-nozzle oiling treatment.

[0025] Preferably, the temperature of the annular cooling air is 15℃~25℃, the humidity is 70%RH~95%RH, and the wind speed is 0.3m / min~0.8m / min.

[0026] More preferably, the temperature of the annular cooling air is 16℃~20℃, the humidity is 80%RH~85%RH, and the wind speed is 0.5m / min~0.7m / min.

[0027] In one embodiment of the present invention, multiple pairs of hot rollers are used to stretch and shape the pre-networked fiber bundles, with a total stretching ratio of 3.5-5.5, preferably 4.1-5.0;

[0028] Preferably, four pairs of stretching rollers are used for stretching and shaping;

[0029] The temperatures of the drawing rollers are 50℃~60℃, 60℃~80℃, 90℃~105℃, and 90℃~105℃, respectively, and the speeds are 400 m / min~800 m / min, 420 m / min~820 m / min, 2000 m / min~2800 m / min, and 2500 m / min~3500 m / min, respectively.

[0030] In one embodiment of the present invention, the stretched and shaped fiber bundle is passed through a main networker for main networking; the fiber bundle passed through the main network is automatically wound at a winding speed of 2500 m / min-3500 m / min, for example 3000 m / min, to obtain anti-yellowing polyethylene fiber.

[0031] The present invention also provides an anti-yellowing polyethylene fiber, which is prepared by the above-described method for preparing anti-yellowing polyethylene fiber.

[0032] Preferably, the tensile strength of the anti-yellowing polyethylene fiber is not less than 2 cN / dtex.

[0033] The beneficial effects of this invention are:

[0034] 1) This invention prepares polyethylene fibers that are resistant to washing, friction, and light exposure, with a functional lifespan consistent with the fiber body, by ball milling and pretreating a silane coupling agent and chitosan mixed in a certain ratio, and embedding the resulting nanoparticles into the fiber through blend spinning rather than surface coating.

[0035] 2) By utilizing the synergistic effect of the combined nanoparticles, chitosan reduces the agglomeration of silane coupling agents and enhances their dispersion effect through the interaction of chemical groups. At the same time, the Si-O-Si cross-linked network formed by the silane coupling agent can effectively capture free radicals and inhibit the photo- and thermal oxidation chain reaction of PE. Attached Figure Description

[0036] Figure 1 This is a process flow diagram for preparing anti-yellowing polyethylene fiber according to the present invention;

[0037] Figure 2 This is a comparison diagram of the effects of the anti-yellowing polyethylene fiber (b) prepared in Example 1 of the present invention and the composite material in the control sample (a) after ultraviolet light aging;

[0038] Figure 3 This is a schematic diagram comparing the thermogravimetric analysis of the fibers prepared in Examples 1, 2, and 3, as well as the control sample fibers. Detailed Implementation

[0039] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0040] Example 1

[0041] Preparation of anti-yellowing polyethylene fibers:

[0042] 1) Preparation of anti-yellowing material: Weigh 5 parts of silane coupling agent KH-570 and 3 parts of carboxymethyl chitosan by weight, mix them and grind them in a ball mill to obtain uniform nano powder; add the nano powder to a certain amount of acetone solution, and sonicate it for 20 minutes to dissolve and disperse it evenly. Then add the catalyst stannous octoate and react at room temperature for 2 hours to allow the two to fully undergo the grafting reaction. After drying, the anti-yellowing material is obtained.

[0043] 2) Blending: The above-mentioned anti-yellowing nanomaterials are blended with polyethylene chips so that the anti-yellowing nanoparticles ultimately account for 3% of the total mass of polyethylene chip fibers.

[0044] 3) Melting: The blended composite material is fed into a screw extruder and melt-blended at a temperature of 255°C to obtain the spinning solution.

[0045] 4) Spinning: The spinning solution is precisely metered by a metering pump and then extruded through a 48-hole spinneret to form fiber bundles. The surface temperature of the 48-hole spinneret is controlled at 250℃.

[0046] 5) Cooling and oiling: The fiber bundles are cooled by ring blowing with hot air equipment, and then oiled with polyethylene oil through double oil nozzles. The cooling air temperature is 16℃±1℃, the humidity is (85±5)% RH, and the wind speed is 0.5 m / min, which reduces the unevenness of the fiber bundles and improves production stability.

[0047] 6) Pre-networking: The oiled fiber bundles are pre-networked by a pre-networking device.

[0048] 7) Stretching and shaping: Four pairs of rollers are used to stretch and shape the pre-networked fiber bundles. The stretching ratio is 4.1. The temperatures of the four pairs of rollers are set to 60℃, 80℃, 95℃ and 95℃ respectively, so as to make the fiber bundles have good uniformity and improve the mechanical properties of the fiber bundles.

[0049] 8) Main network: The stretched and shaped fiber bundles are networked by the main networker;

[0050] 9) Winding: The fiber bundles passing through the main network are wound automatically at a speed of 3000m / min to avoid difficulties in unwinding and obtain anti-yellowing polyethylene fibers.

[0051] Example 2

[0052] 1) Preparation of anti-yellowing material: Weigh 6 parts of silane coupling agent KH-560 and 2 parts of carboxymethyl chitosan by weight, mix them and grind them in a ball mill to obtain uniform nano powder; add the powder to a certain amount of acetone solution, ultrasonically vibrate for 20 minutes to dissolve and disperse it evenly, then add the catalyst 1,8-diazabicyclo[5.4.0]undec-7-ene, react at room temperature for 2 hours to allow the two to fully undergo the grafting reaction, and dry to obtain anti-yellowing material.

[0053] 2) Blending: The above-mentioned anti-yellowing nanomaterials are blended with polyethylene chips so that the final mass of the powder particles accounts for 2% of the total mass of the polyethylene chip fibers.

[0054] 3) Melting: The blended composite material is fed into a screw extruder and melt-blended at a temperature of 255°C to obtain the spinning solution.

[0055] 4) Spinning: The spinning solution is precisely metered by a metering pump and then extruded through a 48-hole spinneret to form fiber bundles. The surface temperature of the 48-hole spinneret is controlled at 260℃.

[0056] 5) Cooling and oiling: The fiber bundles are cooled by ring blowing with hot air equipment, and then oiled with polyethylene oil through double oil nozzles. The cooling air temperature is 16℃±1℃, the humidity is (90±5)% RH, and the wind speed is 0.6m / min, which reduces the unevenness of the fiber bundles and improves production stability.

[0057] 6) Pre-networking: The oiled fiber bundles are pre-networked by a pre-networking device.

[0058] 7) Stretching and shaping: Four pairs of rollers are used to stretch and shape the pre-networked fiber bundles. The stretching ratio is 4.5. The temperatures of the four pairs of rollers are set to 65℃, 80℃, 95℃ and 95℃ respectively, so as to make the fiber bundles have good uniformity and improve the mechanical properties of the fiber bundles.

[0059] 8) Main network: The stretched and shaped fiber bundles are networked by the main networker;

[0060] 9) Winding: The fiber bundles passing through the main network are automatically wound at a speed of 3200m / min to avoid difficulties in unwinding and obtain anti-yellowing polyethylene fibers.

[0061] Example 3

[0062] 1) Preparation of anti-yellowing material: Weigh 4 parts of silane coupling agent KH-550 and 5 parts of carboxymethyl chitosan by weight, mix them and grind them in a ball mill to obtain uniform nano powder; add the powder to a certain amount of acetone solution, and sonicate it for 20 minutes to dissolve and disperse it evenly. Add the catalyst stannous octoate and react at room temperature for 2 hours to allow the two to undergo a grafting reaction. After drying, the anti-yellowing material powder is obtained.

[0063] 2) Blending: The above-mentioned anti-yellowing nanomaterials are mixed with polyethylene chips so that the nanoparticles eventually account for 2.5% of the total mass of polyethylene chip fibers.

[0064] 3) Melting: The blended composite material is fed into a screw extruder and melt-blended at a temperature of 255°C to obtain the spinning solution.

[0065] 4) Spinning: The spinning solution is precisely metered by a metering pump and then extruded through a 72-hole spinneret to form fiber bundles. The surface temperature of the 72-hole spinneret is controlled at 260℃.

[0066] 5) Cooling and oiling: The fiber bundles are cooled by ring blowing with hot air equipment, and then oiled with polyethylene oil through double oil nozzles. The cooling air temperature is 16℃±1℃, the humidity is (90±5)% RH, and the wind speed is 0.5 m / min, which reduces the unevenness of the fiber bundles and improves production stability.

[0067] 6) Pre-networking: The oiled fiber bundles are pre-networked by a pre-networking device.

[0068] 7) Stretching and shaping: Four pairs of rollers are used to stretch and shape the pre-networked fiber bundles. The stretching ratio is 5.0. The temperatures of the four pairs of rollers are set to 60℃, 80℃, 95℃ and 95℃ respectively, so as to make the fiber bundles have good uniformity and improve the mechanical properties of the fiber bundles.

[0069] 8) Main network: The stretched and shaped fiber bundles are networked by the main networker;

[0070] 9) Winding: The fiber bundles passing through the main network are automatically wound at a speed of 3200m / min to avoid difficulties in unwinding and obtain anti-yellowing polyethylene fibers.

[0071] Comparative Example 1

[0072] 1) Melting: PE is fed into a screw extruder and melt-blended at a temperature of 255°C to obtain spinning solution.

[0073] 2) Spinning: The spinning solution is precisely metered by a metering pump and then extruded through a 48-hole spinneret to form fiber bundles. The surface temperature of the 48-hole spinneret is controlled at 252℃.

[0074] 3) Cooling and oiling: The fiber bundles are cooled by ring blowing with hot air equipment, and then oiled with polyethylene oil through double oil nozzles. The cooling air temperature is 16℃±1℃, the humidity is (90±5)% RH, and the wind speed is 0.5 m / min, which reduces the unevenness of the fiber bundles and improves production stability.

[0075] 4) Pre-networking: The oiled fiber bundles are pre-networked using a pre-networking device;

[0076] 5) Stretching and shaping: Four pairs of rollers are used to stretch and shape the pre-networked fiber bundles. The stretching ratio is 4.4. The temperatures of the four pairs of rollers are set to 60℃, 80℃, 100℃ and 100℃ respectively, so as to make the fiber bundles have good uniformity and improve the mechanical properties of the fiber bundles.

[0077] 6) Main network: The stretched and shaped fiber bundles are networked by the main networker;

[0078] 7) Winding: The fiber bundles passing through the main network are automatically wound at a speed of 3200m / min to avoid difficulties in unwinding and obtain anti-yellowing polyethylene fibers.

[0079] The properties of the polyethylene fibers prepared in Examples 1-3 and Comparative Example 1 were tested:

[0080] Mechanical properties were tested in accordance with GB / T 14344-2008 "Test Method for Tensile Properties of Chemical Fiber Filaments";

[0081] Thermal decomposition temperature test: The thermal stability of the material was studied by thermogravimetric analysis (TGA). After drying, 3–4 mg of the material was placed in a small crucible, and its thermal stability was characterized using a thermogravimetric analyzer (with N2 as the protective gas, a flow rate of 10 mL / min, a heating rate of 10 °C / min, and a temperature range of 40–600 °C). The change in sample mass with temperature was recorded. The residual rate is a part of the data in the thermal decomposition test.

[0082] Table 1. Performance test results of fibers prepared in Examples 1-3 and Comparative Example 1

[0083]

[0084] As shown in Table 1, compared with Comparative Example 1, the mechanical properties of the anti-yellowing fibers prepared in Examples 1-3 decreased slightly and the thermal decomposition temperature decreased slightly with the addition of anti-yellowing material nanoparticles, but the high-temperature residue rate increased. This is because the silane coupling agent containing siloxane crosslinks in the thermal field to form a Si-O-Si network structure with excellent thermal stability, which effectively inhibits the thermal degradation chain reaction process.

[0085] The polyethylene fibers prepared in Comparative Example 1 and Example 1 were subjected to UV irradiation resistance tests. The tests were conducted using a self-made UV aging chamber. The prepared material samples were placed in the chamber to simulate UV irradiation conditions in a real environment. The UV aging resistance of the materials was analyzed by periodically removing the samples and observing their color changes. The standard "Laboratory Light Source Exposure Test Methods for Plastics Part 3: Fluorescent Ultraviolet Lamps" (GB / T 16422.3-2014) was followed. The prepared samples were placed in the UV chamber for one week of pre-aging, and then the samples were tested and analyzed after 0, 1, 3, 7, 14, and 21 days of UV aging.

[0086] Figure 2The images show the color changes of the control sample (a) and the anti-yellowing polyethylene fiber (b) prepared in Comparative Example 1 under ultraviolet light irradiation. The comparison shows that the control sample (a) exhibits significant yellowing after 7 days of aging, and the color becomes darker after 21 days. This is attributed to the ultraviolet-induced breakage of the PE molecular chains. The anti-yellowing polyethylene fiber (b) prepared in Example 1 shows little increase in color difference under the same aging conditions, and its yellowing rate is reduced. The mechanism lies in the fact that the Si-O-Si cross-linked network formed by the silane coupling agent effectively captures free radicals, inhibiting the photo-oxidative chain reaction of PE, thus maintaining good color stability under ultraviolet irradiation.

[0087] from Figure 3 Thermogravimetric analysis comparison shows that the initial decomposition temperature of Examples 1-3 is slightly lower than that of the control sample. This is because the added siloxane has a relatively low thermal decomposition temperature of its own alkyl chain compared with polymer materials, which reduces the initial thermal decomposition temperature by about 10°C, but does not affect the use of the material.

[0088] Compared to Comparative Example 1, Examples 1-3 all showed varying degrees of improvement in residual carbon rate. This is because the addition of siloxane reduced the material's combustion performance, causing it to carbonize more during heating and reducing mass loss. The residual carbon rate varied depending on the type and proportion of siloxane used. Example 1 exhibited the highest residual carbon rate, which is beneficial in reducing the risk of material combustion at high temperatures.

[0089] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for preparing anti-yellowing polyethylene fiber, characterized in that, Includes the following steps: S1. Preparation of anti-yellowing material: Weigh silane coupling agent and chitosan according to a certain weight ratio, mix them, and ball mill them to obtain uniform nano powder; add the uniform nano powder to an organic solvent, disperse it by ultrasonic vibration, then add a catalyst to make the two undergo a grafting reaction, and dry it to obtain anti-yellowing material. S2. Blending: The anti-yellowing material prepared in step S1 is blended with polyethylene chips to obtain a composite material; wherein the mass of the anti-yellowing material in the composite material accounts for 1%-5% of the mass of the polyethylene chips; S3, Melting: The composite material after blending in step S2 is melt-blended at a certain temperature, and then subjected to vigorous shearing and stirring to obtain a spinning solution, which is then spun to form fiber bundles. S4. Post-process the fiber bundle to obtain anti-yellowing polyethylene fiber; By weight, the silane coupling agent is 2-10 parts and the chitosan is 1-10 parts; The organic solvent in step S1 is acetone solution, ethanol, or tetrahydrofuran; The silane coupling agent is selected from one or more of KH-550, KH-560, and KH570; The catalyst is selected from stannous octoate or 1,8-diazabicyclo[5.4.0]undec-7-ene; The chitosan is carboxymethyl chitosan.

2. The preparation method according to claim 1, characterized in that, The silane coupling agent is 4-6 parts by weight, and the chitosan is 2-5 parts by weight.

3. The preparation method according to claim 1, characterized in that, The anti-yellowing material accounts for 2% to 3% of the total mass of the polyethylene chips.

4. The preparation method according to claim 3, characterized in that, The anti-yellowing material accounts for 2.5% to 3% of the total mass of the polyethylene chips.

5. The preparation method according to claim 1, characterized in that, In step S3, the composite material after blending in step S2 is fed into a screw extruder and melt-blended at a temperature of 250℃-270℃, and then subjected to vigorous shearing and stirring to obtain a spinning solution.

6. The preparation method according to claim 5, characterized in that, The screw extruder has 6 zones with temperature ranges set at 205℃~215℃, 215℃~225℃, 225℃~235℃, 235℃~250℃, 245℃~260℃, and 250℃~270℃.

7. The preparation method according to claim 1, characterized in that, In step S3, the spinning solution is precisely metered by a metering pump and then extruded by a spinneret to form the fiber bundle.

8. The preparation method according to claim 7, characterized in that, The surface temperature of the spinneret is controlled between 250℃ and 270℃, and the number of holes in the spinneret is 24 to 144.

9. The preparation method according to claim 1, characterized in that, The post-processing steps in step S4 include: cooling, oiling, pre-networking, stretching and shaping, main networking and winding processes to obtain the anti-yellowing polyethylene fiber.

10. The preparation method according to claim 9, characterized in that, The cooling process uses hot air equipment to cool the fiber bundles in a ring, and then uses polyethylene oil to apply oil to the dual oil nozzles.

11. The preparation method according to claim 10, characterized in that, The temperature of the circulating cooling air is 15℃~25℃, the humidity is 70%RH~95%RH, and the wind speed is 0.3m / min~0.8m / min.

12. The preparation method according to claim 11, characterized in that, The temperature of the circulating cooling air is 16℃~20℃, the humidity is 80%RH~85%RH, and the wind speed is 0.5m / min~0.7m / min.

13. The preparation method according to claim 9, characterized in that, Multiple pairs of hot rollers are used to stretch and shape the pre-networked fiber bundles, with a total stretching ratio of 3.5-5.

5.

14. The preparation method according to claim 13, characterized in that, The total stretch ratio is 4.1-5.

0.

15. The preparation method according to claim 13, characterized in that, Four pairs of drawing rollers are used for stretching and shaping; the temperatures of the drawing rollers are 50℃~60℃, 60℃~80℃, 90℃~105℃, and 90℃~105℃, and the speeds are 400m / min~800m / min, 420m / min~820m / min, 2000m / min~2800m / min, and 2500m / min~3500m / min, respectively.

16. The preparation method according to claim 9, characterized in that, The stretched and shaped fiber bundles are then networked by a main networker; the fiber bundles that have passed through the main networker are then automatically wound at a winding speed of 2500m / min-3500m / min to obtain the anti-yellowing polyethylene fiber.

17. The preparation method according to claim 16, characterized in that, The winding speed is 3000 m / min.

18. A type of anti-yellowing polyethylene fiber, characterized in that, The anti-yellowing polyethylene fiber is obtained by any of the preparation methods described in claims 1-17; the tensile strength of the anti-yellowing polyethylene fiber is not less than 2 cN / dtex.

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