Cool-feeling polyethylene fiber and preparation method thereof

Abstract

The invention relates to the field of fibers, in particular to a cool-feeling polyethylene fiber and a preparation method thereof, and the preparation method comprises the following steps: 1, preparing a modifier; 2, preparing modified resin; and 3, melt spinning: putting the modified polyethylene resin into a twin-screw machine for melting, and then carrying out extrusion molding by a spinning machine to obtain the cool-feeling polyethylene fiber. The novel polyethylene fiber is prepared in a melt spinning mode, a certain amount of modifier is added into the polyethylene fiber, and in addition, a small amount of antioxidant and nucleating agent are added, so that the prepared polyethylene fiber has good cool feeling and hygroscopicity, the wearing body feeling comfort is better, and the service life of the polyethylene fiber is prolonged. And the strength and the anti-aging performance are also enhanced.

Description

Technical Field

[0001] The invention relates to the field of fibers, and in particular to a cool 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] As a new type of material that can be applied to knitted fabrics, polyethylene fiber has a good feel, is light and soft, and is suitable for outdoor products and lightweight clothing. Currently, polyethylene fiber clothing fabrics on the market are mostly made of high-density polyethylene (HDPE), which has high tensile strength and rigidity, excellent tolerance to most chemicals (such as solvents, acids, and alkalis), and is not easily corroded. However, polyethylene fiber has poor hygroscopicity, with a moisture regain of only about 0.1%, and almost no water absorption. Therefore, the wearing comfort of polyethylene fiber fabrics is relatively poor. In addition, although high-density polyethylene has a certain UV resistance, it is still prone to aging and brittleness when exposed to strong ultraviolet light for a long time, which affects its service life. Summary of the invention

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

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

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

[0007] Step 1, prepare the modifier:

[0008] S1, weighing magnesium silicide nanopowder and dispersing it in an ethanol solution, then adding an epoxy silane coupling agent, reflux treatment in a water bath, then centrifuging, washing and drying to obtain product A;

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

[0010] S3, weighing 4-vinylguaiacol and adding it to N,N-dimethylformamide, stirring evenly, adding product B, stirring evenly, adding a photoinitiator, reacting under ultraviolet light, and after the reaction is completed, washing and drying 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 after drying, a modified polyethylene resin is obtained;

[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 S1 of step 1, 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 S1 of step 1, the epoxysilane coupling agent is 3-(2,3-epoxypropoxy)propyltrimethoxysilane or 3-glycidyloxypropyltriethoxysilane, 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 step 1, 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, the high-density polyethylene (HDPE) resin and the 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 multiple is 3-9 times.

[0027] In a second aspect, the present invention provides a cool polyethylene fiber 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 magnesium silicide nanopowder, which is an inorganic material, 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 through a mercapto-vinyl click chemistry reaction to generate a thioether group, and finally obtaining a coated modifier.

[0032] 4. The inorganic inner core 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 existence 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 limit the scope of the present invention. The change or adjustment of the relative relationship thereof shall also be regarded as the scope of the present invention without substantially changing the technical content.

[0034] In order to better understand the above technical scheme, the 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 in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0035] The present invention will be further described below in conjunction with 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. Weigh magnesium silicide nanopowder (Mg2Si) with a particle size of 100±10 nm and disperse it in a 60% ethanol solution. The mass volume ratio of magnesium silicide nanopowder and ethanol solution is 1g:15mL. Then add 3-(2,3-epoxypropoxy)propyltrimethoxysilane in an amount of 18% of the mass of magnesium silicide nanopowder. Reflux in a water bath at 70°C for 4h. After the reaction is completed, centrifuge and collect the solid. Then wash it with water three times and vacuum dry it to obtain product A.

[0040] 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 water bath at 65°C for 6h, centrifuge the reaction solution after the reaction, wash the solid product with alcohol three times and then dry to obtain product B;

[0041] 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:0.22g: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 is 15 cm, after stirring for 1.5 hours, the solvent is removed under reduced pressure, the product is rinsed three times with anhydrous ethanol, and then vacuum dried to obtain a modifier;

[0042] Step 2, preparation of modified resin:

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

[0044] Step 3, melt spinning:

[0045] The modified polyethylene resin is put into a twin-screw machine for melting, and then extruded by 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 multiple 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. The mass volume ratio of magnesium silicide nanopowder to ethanol solution is 1g:10mL. Then add 3-glycidyloxypropyltriethoxysilane in an amount of 12% of the mass of magnesium silicide nanopowder. Reflux in a water bath at 50°C for 2h. After the reaction is completed, centrifuge and collect the solid. Then wash it with water three times and vacuum dry it to obtain product A.

[0050] 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:0.16g:5mL, reflux in a water bath at 60°C for 4h, centrifuge the reaction solution after the reaction, wash the solid product with alcohol three times and then dry to obtain product B;

[0051] 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:0.15g: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 is 10 cm, after stirring for 2 hours, the solvent is removed under reduced pressure, the product is rinsed three times with anhydrous ethanol, and then 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% of the mass of high-density polyethylene (HDPE) resin, then add nucleating agent magnesium stearate in an amount of 1% of the mass of high-density polyethylene (HDPE) resin, fully stir, 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, fully stir and disperse until uniform, remove the solvent under reduced pressure, and obtain modified polyethylene resin after drying;

[0054] Step 3, melt spinning:

[0055] The modified polyethylene resin is put into a twin-screw machine for melting, and then extruded by a spinning machine. The spinning temperature is 165°C, the spinning speed is 12m / min, the cooling is water bath cooling, the drawing temperature is 90°C, and the drawing multiple is 3 times 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 ethanol solution with a mass fraction of 80%. The mass volume ratio of magnesium silicide nanopowder and ethanol solution is 1g:20mL. Then add 3-(2,3-epoxypropoxy)propyltrimethoxysilane in an amount of 24% of the mass of magnesium silicide nanopowder. Reflux in a water bath at 80°C for 10h. After the reaction is completed, centrifuge and collect the solid, wash it with water three times and then vacuum dry it to obtain product A.

[0060] 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:0.32g:10mL, reflux in a water bath at 70°C for 8h, centrifuge the reaction solution after the reaction, wash the solid product with alcohol three times and then dry 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 addition amount 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 is 20 cm, after stirring for 2 hours, the solvent is removed under reduced pressure, the product is washed three times with anhydrous ethanol, and then vacuum dried to obtain a modifier;

[0062] Step 2, preparation of modified resin:

[0063] Add antioxidant 1010 to decalin in an amount of 1.8% of the mass of high-density polyethylene (HDPE) resin, then add nucleating agent zinc stearate in an amount of 5% of the mass of high-density polyethylene (HDPE) resin, fully stir, then add high-density polyethylene (HDPE) resin with a molecular weight of 250,000, heat to 120°C, keep warm and stir at this temperature until dissolved, then add modifier, the mass volume ratio of modifier, high-density polyethylene (HDPE) resin and decalin is 0.2g:1g:10mL, fully stir and disperse until uniform, remove the solvent under reduced pressure, and dry to obtain 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 by a spinning machine. The spinning temperature is 165°C, the spinning speed is 20m / min, the cooling is water bath cooling, the drawing temperature is 80°C, and the drawing multiple is 9 times to obtain a cool polyethylene fiber.

[0066] Comparative Example 1

[0067] A method for preparing a cool polyethylene fiber is different from Example 1 only in that the modifier used in Example 1 is replaced by magnesium silicide nanopowder (Mg2Si), and 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. Weigh magnesium silicide nanopowder (Mg2Si) with a particle size of 100±10 nm and disperse it in a 60% ethanol solution. The mass volume ratio of magnesium silicide nanopowder and ethanol solution is 1g:15mL. Then add 3-(2,3-epoxypropoxy)propyltrimethoxysilane in an amount of 18% of the mass of magnesium silicide nanopowder. Reflux in a water bath at 70°C for 4h. After the reaction is completed, centrifuge and collect the solid. Then wash it with water three times and vacuum dry it 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 water bath at 65°C for 6h, centrifuge the reaction solution after the reaction is completed, 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. Weigh magnesium silicide nanopowder (Mg2Si) with a particle size of 100±10 nm and disperse it in a 60% ethanol solution. The mass volume ratio of magnesium silicide nanopowder and ethanol solution is 1g:15mL. Then add 3-(2,3-epoxypropoxy)propyltrimethoxysilane in an amount of 18% of the mass of magnesium silicide nanopowder. Reflux in a water bath at 70°C for 4h. After the reaction is completed, centrifuge and collect the solid. Then wash it with water three times and vacuum dry it 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 the reaction is completed, 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, and the test items included breaking strength, moisture regain and aging resistance. Specifically:

[0077] 1. Breaking strength and breaking elongation: Under standard atmospheric conditions (20±2℃, 65±5%RH), three samples 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 testing 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 testing standard refers to GB / T 31899-2015 "Textile Weathering Test-UV 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°C for 120 h, 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 can be seen from Table 1, the strength and elongation at break of the fiber prepared in Example 1 of the present invention are higher, indicating that it has better mechanical properties. In addition, it can also have better hygroscopicity (moisture regain) and aging resistance. The most likely reason for the insufficient performance of various properties in Comparative Example 1 is the insufficient dispersibility and cross-linking of the nanopowder in the fiber; and the reason why Comparative Example 3 is not as good as Comparative Example 2 may be that 4-vinylguaiacol is not fixed by grafting, but reduces the performance of the fiber to a certain extent.

[0084] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may 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 is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary 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, weighing magnesium silicide nanopowder and dispersing it in an ethanol solution, then adding an epoxy silane coupling agent, reflux treatment in a water bath, then centrifuging, washing and drying to obtain product A; S2, weigh 5-amino-2-mercaptobenzimidazole and dissolve it in tetrahydrofuran, add product A, and reflux again in a water bath. After the reaction is completed, centrifuge, rinse and dry to obtain product B; S3, weighing 4-vinylguaiacol and adding it to N,N-dimethylformamide, stirring evenly, adding product B, stirring evenly, adding a photoinitiator, reacting under ultraviolet light, and after the reaction is completed, washing and drying 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 after drying, a modified polyethylene resin is obtained; 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, characterized in that: In 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-glycidyloxypropyltriethoxysilane, and the added amount is 12%-24% of the mass of the magnesium silicide nanopowder.

3. The method for preparing a cool polyethylene fiber according to claim 1, characterized in that: 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, characterized in that: 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, characterized in that: 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, the high-density polyethylene (HDPE) resin and the 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 multiple is 3-9 times.

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