Cooling polyethylene fiber and preparation method thereof

Abstract

The present invention relates to the field of fibers, and more particularly to a cooling polyethylene fiber and a preparation method thereof. The preparation method comprises the following steps: Step 1, preparing a modifier; Step 2, preparing a modified resin; and Step 3, melt spinning: the modified polyethylene resin is melted in a twin-screw extruder, and then extruded through a spinning machine to obtain the cooling polyethylene fiber. The present invention prepares a novel polyethylene fiber by melt spinning. A certain amount of modifier, a small amount of antioxidant, and a nucleating agent are added to the polyethylene fiber. The prepared polyethylene fiber not only has good cooling and hygroscopicity, making it more comfortable to wear, but also has enhanced strength and aging resistance.

Description

Technical Field

[0001] The present invention relates to the field of fibers, and in particular to a cooling polyethylene fiber and a preparation method thereof. Background Art

[0002] In order to adapt to the development of modern society and meet the increasingly diversified needs of customers, the development of new products, new technologies and new processes is very necessary. From the perspective of clothing, people no longer simply pursue the beauty and durability of clothing materials, but hope that clothes can have multiple functions such as cooling, perspiration, antibacterial and deodorizing in summer or hot and humid places. It is not only the basis for clothing companies to carry out production and operation activities, but also an important means to improve competitiveness and economic benefits. Therefore, natural and environmentally friendly, moisture-absorbing and breathable, antibacterial and deodorizing, cool and comfortable are the concepts commonly used as spring and summer clothing fabrics in recent years.

[0003] Polyethylene fiber, a new material for knitted fabrics, offers a pleasant hand feel, is lightweight, and is soft, making it suitable for outdoor wear and lightweight apparel. Currently, most polyethylene fiber apparel fabrics on the market are made from high-density polyethylene (HDPE), which exhibits high tensile strength and rigidity, excellent resistance to most chemicals (such as solvents, acids, and alkalis), and is resistant to corrosion. However, polyethylene fiber has poor hygroscopicity, with a moisture regain of only approximately 0.1%, meaning it absorbs virtually no water. Therefore, polyethylene fiber fabrics are relatively uncomfortably comfortable to wear. Furthermore, while HDPE exhibits some UV resistance, prolonged exposure to strong UV light can lead to aging and brittleness, shortening their service life. Summary of the Invention

[0004] In view of the problems existing in the prior art, the present invention aims to provide a cooling polyethylene fiber and a preparation method thereof.

[0005] The purpose of the present invention is achieved by adopting the following technical solutions:

[0006] In a first aspect, the present invention provides a method for preparing a cooling polyethylene fiber, comprising the following steps:

[0007] Step 1, prepare the modifier:

[0008] S1. Weigh magnesium silicide nanopowder and disperse it in an ethanol solution. Then add an epoxy silane coupling agent and reflux it in a water bath. Then, centrifuge, rinse, and dry it to obtain product A.

[0009] S2. Weigh 5-amino-2-mercaptobenzimidazole and dissolve it in tetrahydrofuran, add product A, and reflux in a water bath again. After the reaction is completed, centrifuge, rinse, and dry to obtain product B;

[0010] S3. Weigh 4-vinylguaiacol and add it to N,N-dimethylformamide. After stirring evenly, add product B. After stirring evenly, add a photoinitiator and react under ultraviolet light. After the reaction is completed, rinse and dry the product to obtain a modifier.

[0011] Step 2: Preparation of modified resin:

[0012] The antioxidant and the nucleating agent are added to the organic solvent, and after being fully stirred, the high-density polyethylene resin is added, and the temperature is raised and stirred until dissolved, and the modifier is added, and after being fully stirred again, the solvent is removed under reduced pressure and dried to obtain the modified polyethylene resin;

[0013] Step 3, melt spinning:

[0014] The modified polyethylene resin is put into a twin-screw machine for melting, and then extruded and formed by a spinning machine to obtain cool polyethylene fibers.

[0015] Preferably, in step S1 of the first step, the mass volume ratio of the magnesium silicide nanopowder to the ethanol solution is 1 g:(10-20) mL, the particle size of the magnesium silicide nanopowder is 100±10 nm, and the mass fraction of the ethanol solution is 40%-80%.

[0016] Preferably, in step S1 of the first step, the epoxysilane coupling agent is 3-(2,3-epoxypropoxy)propyltrimethoxysilane or 3-glycidoxypropyltriethoxysilane, and the added amount is 12%-24% of the mass of the magnesium silicide nanopowder.

[0017] Preferably, in S2 of step 1, the mass volume ratio of product A, 5-amino-2-mercaptobenzimidazole and tetrahydrofuran is 1 g:(0.16-0.32) g:(5-10) mL.

[0018] Preferably, in S3 of step 1, the mass volume ratio of product B, 4-vinylguaiacol and N,N-dimethylformamide is 1 g:(0.15-0.3) g:(6-12) mL.

[0019] Preferably, in S3 of step 1, the photoinitiator is one of photoinitiator BP, photoinitiator TPO, and photoinitiator 651, and the added amount is 2%-8% of the mass of 4-vinylguaiacol.

[0020] Preferably, in step S3 of the first step, the ultraviolet light condition is: the radiation intensity is 50-100 mW / cm 2 , the irradiation distance is 10-20cm.

[0021] Preferably, in the second step, the molecular weight of the high-density polyethylene resin is 150,000-250,000 and the density is 0.941-0.965 g / cm3 .

[0022] Preferably, in the second step, the antioxidant is antioxidant 168 or antioxidant 1010, and the added amount is 0.6%-1.8% of the mass of the high-density polyethylene (HDPE) resin.

[0023] Preferably, in the second step, the nucleating agent is zinc stearate or magnesium stearate, and the added amount is 1%-5% of the mass of the high-density polyethylene (HDPE) resin.

[0024] Preferably, in the second step, the organic solvent is one of benzene, toluene, carbon tetrachloride, decahydronaphthalene, and petroleum ether.

[0025] Preferably, in the second step, the mass volume ratio of the modifier, high-density polyethylene (HDPE) resin and organic solvent is (0.1-0.2) g:1 g:(5-10) mL.

[0026] Preferably, in the third step, the spinning temperature is 165-190° C., the spinning speed is 12-20 m / min, the cooling is water bath cooling, the drawing temperature is 80-90° C., and the drawing ratio is 3-9 times.

[0027] In a second aspect, the present invention provides a cooling polyethylene fiber, which is prepared by the above-mentioned preparation method.

[0028] The beneficial effects of the present invention are:

[0029] 1. The present invention prepares a new type of polyethylene fiber by melt spinning. A certain amount of modifier is added to the polyethylene fiber, and a small amount of antioxidant and nucleating agent are also added. The prepared polyethylene fiber not only has good cooling and hygroscopicity, making the wearing comfort better, but also has enhanced strength and anti-aging properties.

[0030] 2. The modifier used in the process of preparing the fiber of the present invention is an organic-inorganic coating material obtained by performing surface organic modification treatment on the surface of the inorganic material magnesium silicide nanopowder, which is used as a matrix.

[0031] 3. The preparation process of the modifier includes: first treating magnesium silicide nanopowder with a coupling agent to obtain an epoxidized powder; then mixing 5-amino-2-mercaptobenzimidazole with the epoxidized powder, and obtaining an organic-coated powder containing mercapto and benzimidazole through an epoxy-amino combination reaction; then mixing the powder with 4-vinylguaiacol, and combining them through a mercapto-vinyl click chemistry reaction to generate a thioether group, thereby finally obtaining a coated modifier.

[0032] 4. The inorganic inner layer of the modifier prepared by the present invention is magnesium silicide nanopowder, which has good thermal conductivity and can enhance the cool feeling of the fiber material; while the organic coating layer contains a large number of amino groups, sulfide groups, benzimidazole and guaiacol groups, which enhance the hygroscopicity of the fiber while also improving the strength and aging resistance of the fiber. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is described below through specific examples. It should be understood that the one or more method steps mentioned in the present invention do not exclude the presence of other method steps before and after the combination step or the insertion of other method steps between these explicitly mentioned steps; it should also be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. Moreover, unless otherwise specified, the numbering of each method step is only a convenient tool for identifying each method step, and is not intended to limit the order of arrangement of each method step or to define the scope of the present invention. Changes or adjustments in their relative relationships, without substantially changing the technical content, should also be regarded as the scope of the present invention.

[0034] In order to better understand the above technical solutions, exemplary embodiments of the present invention are described in more detail below. Although exemplary embodiments of the present invention are shown, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0035] The present invention will be further described below with reference to the following examples.

[0036] Example 1

[0037] A method for preparing a cool polyethylene fiber comprises the following steps:

[0038] Step 1, prepare the modifier:

[0039] S1. Magnesium silicide nanopowder (Mg2Si) with a particle size of 100±10 nm was dispersed in a 60% ethanol solution at a mass volume ratio of 1 g:15 mL. 3-(2,3-epoxypropoxy)propyltrimethoxysilane was then added in an amount of 18% of the mass of the magnesium silicide nanopowder. The mixture was refluxed in a 70°C water bath for 4 h. After the reaction, the solid was collected by centrifugation, washed three times with water, and then dried in vacuo to obtain product A.

[0040] S2. Weigh 5-amino-2-mercaptobenzimidazole and dissolve it in tetrahydrofuran. Add product A in a mass volume ratio of product A, 5-amino-2-mercaptobenzimidazole and tetrahydrofuran of 1 g:0.24 g:10 mL. Reflux in a 65° C. water bath for 6 h. After the reaction, centrifuge the reaction solution, wash the solid product three times with alcohol, and then dry it to obtain product B.

[0041] S3. Weigh 4-vinylguaiacol and add it to N,N-dimethylformamide. After stirring and dissolving evenly, add product B. The mass volume ratio of product B, 4-vinylguaiacol and N,N-dimethylformamide is 1g:0.22g:10mL. Stir evenly at room temperature. Then add photoinitiator 651. The addition amount is 5% of the mass of 4-vinylguaiacol. Stir under ultraviolet light. The ultraviolet light condition is: the radiation intensity is 60mW / cm 2 , the irradiation distance was 15 cm, and after stirring for 1.5 h, the solvent was removed under reduced pressure, and the product was rinsed three times with anhydrous ethanol and dried in vacuum to obtain a modifier;

[0042] Step 2: Preparation of modified resin:

[0043] Add antioxidant 1010 to toluene at a rate of 1.2% of the mass of the HDPE resin, then add zinc stearate, a nucleating agent, at a rate of 3% of the mass of the HDPE resin. After stirring thoroughly, add a 200,000 molecular weight, 0.952 g / cm3 density PEG-100, and a 0.952 g / cm3 PEG-100 with a density of 0.952 g / cm3. 3 The high-density polyethylene (HDPE) resin is heated to 100° C., stirred at this temperature until dissolved, and then a modifier is added. The mass volume ratio of the modifier, high-density polyethylene (HDPE) resin and toluene is 0.15 g:1 g:8 mL. After being fully stirred and dispersed until uniform, the solvent is removed under reduced pressure and dried to obtain a modified polyethylene resin.

[0044] Step 3, melt spinning:

[0045] The modified polyethylene resin is put into a twin-screw machine for melting, and then extruded into a spinning machine. The melt spinning temperature is 170°C, the spinning speed is 16m / min, the cooling is water bath cooling, the drawing temperature is 85°C, and the drawing ratio is 6 times to obtain a cool polyethylene fiber.

[0046] Example 2

[0047] A method for preparing a cool polyethylene fiber comprises the following steps:

[0048] Step 1, prepare the modifier:

[0049] S1. Weigh magnesium silicide nanopowder (Mg2Si) with a particle size of 100±10 nm and disperse it in a 40% ethanol solution at a mass volume ratio of 1 g:10 mL. Then, add 3-glycidyloxypropyltriethoxysilane in an amount of 12% of the mass of the magnesium silicide nanopowder. Reflux in a 50°C water bath for 2 h. After the reaction is completed, centrifuge and collect the solid, wash it three times with water, and then vacuum dry it to obtain product A.

[0050] S2. Weigh 5-amino-2-mercaptobenzimidazole and dissolve it in tetrahydrofuran. Add product A in a mass volume ratio of product A, 5-amino-2-mercaptobenzimidazole and tetrahydrofuran of 1 g:0.16 g:5 mL. Reflux in a 60°C water bath for 4 h. After the reaction, centrifuge the reaction solution, wash the solid product three times with alcohol, and then dry it to obtain product B.

[0051] S3. Weigh 4-vinylguaiacol and add it to N,N-dimethylformamide. After stirring and dissolving evenly, add product B. The mass volume ratio of product B, 4-vinylguaiacol and N,N-dimethylformamide is 1g:0.15g:6mL. Stir evenly at room temperature. Then add photoinitiator BP. The addition amount is 2% of the mass of 4-vinylguaiacol. Stir under ultraviolet light. The ultraviolet light condition is: the radiation intensity is 50mW / cm 2 , the irradiation distance was 10 cm, and after stirring for 2 h, the solvent was removed under reduced pressure, the product was rinsed three times with anhydrous ethanol, and vacuum dried to obtain a modifier;

[0052] Step 2: Preparation of modified resin:

[0053] Add antioxidant 168 to benzene in an amount of 0.6% by mass of high-density polyethylene (HDPE) resin, then add nucleating agent magnesium stearate in an amount of 1% by mass of high-density polyethylene (HDPE) resin, stir thoroughly, then add high-density polyethylene (HDPE) resin with a molecular weight of 150,000, heat to 90°C, keep stirring at this temperature until dissolved, then add modifier, the mass volume ratio of modifier, high-density polyethylene (HDPE) resin and benzene is 0.1g:1g:5mL, stir thoroughly until dispersed uniformly, remove the solvent under reduced pressure, and dry to obtain modified polyethylene resin;

[0054] Step 3, melt spinning:

[0055] The modified polyethylene resin is put into a twin-screw machine for melting, and then extruded into a spinning machine with a spinning temperature of 165°C, a spinning speed of 12m / min, cooling in a water bath, a drawing temperature of 90°C, and a drawing ratio of 3 to obtain a cool polyethylene fiber.

[0056] Example 3

[0057] A method for preparing a cool polyethylene fiber comprises the following steps:

[0058] Step 1, prepare the modifier:

[0059] S1. Weigh magnesium silicide nanopowder (Mg2Si) with a particle size of 100±10 nm and disperse it in an 80% ethanol solution at a mass volume ratio of 1 g:20 mL. Then, add 3-(2,3-epoxypropoxy)propyltrimethoxysilane in an amount of 24% of the mass of the magnesium silicide nanopowder. Reflux in an 80°C water bath for 10 h. After the reaction, centrifuge and collect the solid, wash it three times with water, and then vacuum dry it to obtain product A.

[0060] S2. Weigh 5-amino-2-mercaptobenzimidazole and dissolve it in tetrahydrofuran. Add product A in a mass volume ratio of product A, 5-amino-2-mercaptobenzimidazole and tetrahydrofuran of 1 g:0.32 g:10 mL. Reflux in a 70°C water bath for 8 h. After the reaction, centrifuge the reaction solution, wash the solid product three times with alcohol, and then dry it to obtain product B.

[0061] S3. Weigh 4-vinylguaiacol and add it to N,N-dimethylformamide. Stir and dissolve evenly. Then add product B. The mass volume ratio of product B, 4-vinylguaiacol and N,N-dimethylformamide is 1g:0.3g:12mL. Stir evenly at room temperature. Then add photoinitiator TPO. The amount added is 8% of the mass of 4-vinylguaiacol. Stir under ultraviolet light. The ultraviolet light condition is: the radiation intensity is 100mW / cm 2 , the irradiation distance was 20 cm, and after stirring for 2 h, the solvent was removed under reduced pressure, the product was rinsed three times with anhydrous ethanol, and vacuum dried to obtain a modifier;

[0062] Step 2: Preparation of modified resin:

[0063] The antioxidant 1010 is added to decalin in an amount of 1.8% by weight of the high-density polyethylene (HDPE) resin, and the nucleating agent zinc stearate is added in an amount of 5% by weight of the high-density polyethylene (HDPE) resin. After thorough mixing, a high-density polyethylene (HDPE) resin with a molecular weight of 250,000 is added. The temperature is raised to 120° C. and stirred at this temperature until dissolved. Then, a modifier is added. The mass volume ratio of the modifier, high-density polyethylene (HDPE) resin, and decalin is 0.2 g:1 g:10 mL. After thorough stirring and dispersion until uniform, the solvent is removed under reduced pressure and dried to obtain a modified polyethylene resin.

[0064] Step 3, melt spinning:

[0065] The modified polyethylene resin is put into a twin-screw machine for melting, and then extruded into a spinning machine with a spinning temperature of 165°C, a spinning speed of 20m / min, cooling in a water bath, a drawing temperature of 80°C, and a drawing ratio of 9 times to obtain a cool polyethylene fiber.

[0066] Comparative Example 1

[0067] A method for preparing a cooling polyethylene fiber is different from Example 1 only in that the modifier used in Example 1 is replaced by magnesium silicide nanopowder (Mg2Si), and the other preparation methods remain unchanged.

[0068] Comparative Example 2

[0069] A method for preparing a cool polyethylene fiber is different from Example 1 only in that the preparation method of the modifier is different. The preparation method of the modifier in this comparative example includes:

[0070] S1. Magnesium silicide nanopowder (Mg2Si) with a particle size of 100±10 nm was dispersed in a 60% ethanol solution at a mass volume ratio of 1 g:15 mL. 3-(2,3-epoxypropoxy)propyltrimethoxysilane was then added in an amount of 18% of the mass of the magnesium silicide nanopowder. The mixture was refluxed in a 70°C water bath for 4 h. After the reaction, the solid was collected by centrifugation, washed three times with water, and then dried in vacuo to obtain product A.

[0071] S2. Weigh 5-amino-2-mercaptobenzimidazole and dissolve it in tetrahydrofuran, add product A, the mass volume ratio of product A, 5-amino-2-mercaptobenzimidazole and tetrahydrofuran is 1g:0.24g:10mL, reflux in a 65°C water bath for 6h, centrifuge the reaction solution after completion of the reaction, wash the solid product with alcohol three times and then dry to obtain a modifier.

[0072] Comparative Example 3

[0073] A method for preparing a cool polyethylene fiber is different from Example 1 only in that the preparation method of the modifier is different. The preparation method of the modifier in this comparative example includes:

[0074] S1. Magnesium silicide nanopowder (Mg2Si) with a particle size of 100±10 nm was dispersed in a 60% ethanol solution at a mass volume ratio of 1 g:15 mL. 3-(2,3-epoxypropoxy)propyltrimethoxysilane was then added in an amount of 18% of the mass of the magnesium silicide nanopowder. The mixture was refluxed in a 70°C water bath for 4 h. After the reaction, the solid was collected by centrifugation, washed three times with water, and then dried in vacuo to obtain product A.

[0075] S2. Weigh 5-amino-2-mercaptobenzimidazole and 4-vinylguaiacol, add them to tetrahydrofuran, stir evenly, add product A, the mass volume ratio of product A, 5-amino-2-mercaptobenzimidazole, 4-vinylguaiacol and tetrahydrofuran is 1g:0.24g:0.22g:10mL, reflux in a water bath at 65°C for 6h, centrifuge the reaction solution after completion of the reaction, wash the solid product with alcohol three times and then dry to obtain a modifier.

[0076] The properties of the fibers prepared in Example 1 and Comparative Examples 1-3 were tested accordingly. The test items included breaking strength, moisture regain, and aging resistance. Specifically:

[0077] 1. Breaking strength and elongation: Under standard atmospheric conditions (20±2℃, 65±5%RH), three specimens of each type were tested according to GB / T 29554-2013.

[0078] 2. Moisture regain: Under standard atmospheric conditions (20±2℃, 65±5%RH), the test standard refers to the oven drying method in GB / T9995-1997 "Determination of moisture content and moisture regain of textile materials".

[0079] 3. Aging resistance: The test standard refers to GB / T 31899-2015 "Textiles - Weathering Resistance Test - Ultraviolet Exposure", specifically: use 340nm UVA lamp with an irradiance of 200W / m 2 The samples were treated with ultraviolet light at a blackboard temperature of 60℃ for 120h, and the breaking strength retention rate was tested.

[0080] The test results are shown in Table 1:

[0081] Table 1 Test results of different fibers

[0082] Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Breaking strength (cN / dtex) 14.8 11.2 12.5 12.0 Elongation at break (%) 22.6 17.3 20.4 19.7 Moisture regain (%) 2.0 0.4 1.1 1.8 Change rate of breaking strength after aging (%) -10.2 -23.5 -14.1 -16.7

[0083] As shown in Table 1, the fibers prepared in Example 1 of the present invention exhibit higher strength and elongation at break, demonstrating superior mechanical properties. Furthermore, they exhibit good moisture absorption (moisture regain) and aging resistance. The most likely reason for the suboptimal performance in Comparative Example 1 is insufficient dispersion and crosslinking of the nanopowder within the fibers. The inferior performance of Comparative Example 3 may be due to the lack of grafting of 4-vinylguaiacol, which in turn degrades the fiber's performance.

[0084] In the description of this specification, reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0085] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A method for preparing a cool polyethylene fiber, characterized in that: The following steps are involved: Step 1, prepare the modifier: S1. Weigh magnesium silicide nanopowder and disperse it in an ethanol solution. Then add an epoxy silane coupling agent and reflux it in a water bath. Then, centrifuge, rinse, and dry it to obtain product A. S2. Weigh 5-amino-2-mercaptobenzimidazole and dissolve it in tetrahydrofuran, add product A, and reflux in a water bath again. After the reaction is completed, centrifuge, rinse, and dry to obtain product B; S3. Weigh 4-vinylguaiacol and add it to N,N-dimethylformamide. After stirring evenly, add product B. After stirring evenly, add a photoinitiator and react under ultraviolet light. After the reaction is completed, rinse and dry the product to obtain a modifier. Step 2: Preparation of modified resin: The antioxidant and the nucleating agent are added to the organic solvent, and after being fully stirred, the high-density polyethylene resin is added, and the temperature is raised and stirred until dissolved, and the modifier is added, and after being fully stirred again, the solvent is removed under reduced pressure and dried to obtain the modified polyethylene resin; Step 3, melt spinning: The modified polyethylene resin is put into a twin-screw machine for melting, and then extruded and formed by a spinning machine to obtain cool polyethylene fibers.

2. The method for preparing a cool polyethylene fiber according to claim 1, wherein: In step S1 of the first step, the mass volume ratio of the magnesium silicide nanopowder and the ethanol solution is 1 g: (10-20) mL; the epoxysilane coupling agent is 3-(2,3-epoxypropoxy)propyltrimethoxysilane or 3-glycidoxypropyltriethoxysilane, and the added amount is 12%-24% of the mass of the magnesium silicide nanopowder.

3. The method for preparing a cool feeling polyethylene fiber according to claim 1, wherein: In S2 of step 1, the mass volume ratio of product A, 5-amino-2-mercaptobenzimidazole and tetrahydrofuran is 1 g:(0.16-0.32) g:(5-10) mL.

4. The method for preparing a cool polyethylene fiber according to claim 1, wherein: In S3 of the first step, the mass volume ratio of the product B, 4-vinylguaiacol, and N,N-dimethylformamide is 1 g:(0.15-0.3) g:(6-12) mL.

5. The method for preparing a cool polyethylene fiber according to claim 1, wherein: In S3 of the first step, the photoinitiator is one of photoinitiator BP, photoinitiator TPO, and photoinitiator 651, and the added amount is 2%-8% of the mass of 4-vinylguaiacol.

6. The method for preparing a cool polyethylene fiber according to claim 1, characterized in that: In the second step, the antioxidant is antioxidant 168 or antioxidant 1010, and the added amount is 0.6%-1.8% of the mass of the high-density polyethylene (HDPE) resin; the nucleating agent is zinc stearate or magnesium stearate, and the added amount is 1%-5% of the mass of the high-density polyethylene (HDPE) resin.

7. The method for preparing a cool polyethylene fiber according to claim 1, characterized in that: In the second step, the organic solvent is one of benzene, toluene, carbon tetrachloride, decahydronaphthalene, and petroleum ether.

8. The method for preparing a cool polyethylene fiber according to claim 1, characterized in that: In the second step, the mass volume ratio of the modifier, high-density polyethylene (HDPE) resin and organic solvent is (0.1-0.2) g:1 g:(5-10) mL.

9. The method for preparing a cool polyethylene fiber according to claim 1, characterized in that: In the third step, the spinning temperature is 165-190° C., the spinning speed is 12-20 m / min, the cooling is water bath cooling, the drawing temperature is 80-90° C., and the drawing ratio is 3-9 times.

10. A cooling polyethylene fiber, characterized in that: The preparation method according to claim 1 is used for preparation.