A cool-sensation fiber knitted fabric and its preparation method

Abstract

The present invention relates to the field of fabrics, and particularly to a cool-sensation fiber knitted fabric and a preparation method thereof. The preparation method comprises the following steps: Step 1, obtaining pretreated polyethylene fibers; Step 2, obtaining aminated polyethylene fibers; Step 3, obtaining activated polyethylene fibers; Step 4, obtaining modified polyethylene fibers; Step 5, after treating the modified polyethylene fibers through the steps of opening, drawing, roving, spinning, winding, doubling, and twisting, obtaining modified polyethylene yarns; Step 6, using a weft knitting circular knitting machine to knit the modified polyethylene yarns to obtain a knitted fabric. The present invention prepares a fiber knitted fabric with a cool sensation. The fabric is prepared by using modified polyethylene fibers as raw materials. The prepared fabric not only has the characteristics of cool sensation, lightness, and wear resistance of traditional polyethylene fabrics, but also has the advantages of moisture absorption and quick drying and anti-aging.

Description

Technical Field

[0001] The present invention relates to the field of fabrics, and particularly to a cool-sensation fiber knitted fabric 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, it is very necessary to develop new products, new technologies and new processes. From the perspective of clothing, people no longer simply pursue the good-looking and durability of clothing materials, but hope that clothes can play multiple functions such as cooling, sweating, antibacterial and odor-proof in summer or hot and humid places. This is not only the basis for clothing enterprises to carry out production and operation activities, but also an important means to improve competitiveness and economic benefits. Therefore, natural environmental protection, moisture absorption and breathability, antibacterial and odor-proof, cool and comfortable are the concepts commonly used as spring and summer clothing fabrics in recent years.

[0003] As a new material that can be applied to knitted fabrics, polyethylene fiber has a good hand feeling, is light and soft, and is suitable for outdoor products and lightweight clothing; it has excellent wear resistance and is not easy to wear after long-term use, and is suitable for making high-quality clothing and products; and it has good resilience and comfort. Wearing clothes made of this fabric can better fit the body curve and is comfortable to wear. However, the polyethylene fiber fabric has poor moisture absorption, which is not conducive to sweating and ventilation. Wearing clothes made of this fabric will feel airtight in hot weather and is easy to cause discomfort. In addition, the polyethylene fabric is also easily affected by ultraviolet rays, resulting in aging and embrittlement, and reducing the service life. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a cool-sensation fiber knitted fabric and a preparation method thereof.

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

[0006] In the first aspect, the present invention provides a preparation method of a cool-sensation fiber knitted fabric, including the following steps:

[0007] Step 1, pretreatment:

[0008] Soak the polyethylene fiber in hydrogen peroxide, stir it, and then filter, wash and dry it to obtain pretreated polyethylene fiber;

[0009] Step 2, amination treatment:

[0010] Mix the pretreated polyethylene fiber and an ethanol solution, add an aminosilane coupling agent, heat it up, and after the treatment is completed, filter, rinse and dry it to obtain aminated polyethylene fiber;

[0011] Step 3, activation treatment:

[0012] Aminated polyethylene fiber, 2-furanacrolein and absolute ethanol are mixed and dispersed evenly. Then, a catalyst is added, and the reaction is carried out under the protection of nitrogen by heating. After the reaction ends, the solvent is removed, and after washing and drying, activated polyethylene fiber is obtained;

[0013] Step 4, modification treatment:

[0014] Activated polyethylene fiber, 2-mercaptomethylbenzimidazole and absolute ethanol are mixed, nitrogen is introduced as a protective gas, a photoinitiator is added, and the reaction is carried out with stirring under ultraviolet irradiation. After the reaction ends, the solvent is removed, and after washing and drying, modified polyethylene fiber is obtained;

[0015] Step 5, spinning:

[0016] After the modified polyethylene fiber is processed through the steps of opening, drawing, roving, spinning, winding, doubling, and twisting, modified polyethylene yarn is obtained;

[0017] Step 6, textile fabric:

[0018] The modified polyethylene yarn is knitted using a circular weft knitting machine to obtain a knitted fabric.

[0019] Preferably, in step 1, the mass fraction of hydrogen peroxide is 10% - 30%, and the mass ratio of polyethylene fiber to hydrogen peroxide is 1:10 - 20.

[0020] Preferably, in step 1, the number-average molecular weight of the polyethylene fiber is 1 million - 3 million.

[0021] Preferably, in step 1, the treatment temperature is 25 - 45 °C, and the treatment time is 1 - 5 h.

[0022] Preferably, in step 2, the mass fraction of the ethanol solution is 30% - 70%; the mass ratio of pretreated polyethylene fiber, amino-silane coupling agent and ethanol solution is 1:0.2 - 0.6:10 - 20.

[0023] Preferably, in step 2, the amino-silane coupling agent is KH-550 or KH-602.

[0024] Preferably, in step 2, the treatment temperature is 50 - 70 °C, and the treatment time is 2 - 6 h.

[0025] Preferably, in step 3, the mass ratio of aminated polyethylene fiber, 2-furanacrolein and absolute ethanol is 1:0.18 - 0.36:20 - 30.

[0026] Preferably, in step 3, the catalyst is triethylamine, and the addition amount is 3.5% - 8.5% of the mass of 2-furanacrolein.

[0027] Preferably, in the step 3, the temperature for the temperature-raising reaction is 70-80 °C, and the time for the temperature-raising reaction is 2-8 h.

[0028] Preferably, in the step 4, the mass ratio of the activated polyethylene fiber, 2-mercaptomethylbenzimidazole and absolute ethanol is 1:0.24-0.48:20-30.

[0029] Preferably, in the step 4, the photoinitiator is benzoin dimethyl ether or benzophenone, and the addition amount is 2%-7% of the mass of 2-mercaptomethylbenzimidazole.

[0030] Preferably, in the step 4, the irradiation wavelength of the ultraviolet light is 365 nm, the light intensity is 10-30 mW / cm 2 , and the stirring reaction time is 0.6-2.4 h.

[0031] Preferably, in the step 5, the specifications of the modified polyethylene yarn are one of 24D / 28F, 50D / 72F, 50D / 144F, 75D / 72F, 75D / 144F, 75D / 288F, 150D / 288F, 150D / 288F, 150D / 576F.

[0032] Preferably, in the step 6, the modified polyethylene yarn is used as both the warp yarn and the weft yarn at the same time, and the knitting method is a one-up-one-down warp and weft regular knitting, that is, the weft-running yarn is bent up and down section by section to form coils, and successively passes through the coils formed by the previous yarn, and is looped into cloth; the warp density of the fabric is 175-193 per 10 cm, and the weft density of the fabric is 169-187 per 10 cm.

[0033] In the second aspect, the present invention provides a cool-sensation fiber knitted fabric prepared by the above preparation method.

[0034] The beneficial effects of the present invention are as follows:

[0035] 1. The present invention prepares a fiber knitted fabric with a cool sensation. The fabric is prepared by using a modified polyethylene fiber as a raw material. The prepared fabric not only has the characteristics of cool sensation, lightness and wear resistance of the traditional polyethylene fabric, but also has the advantages of moisture absorption and quick drying and aging resistance.

[0036] 2. The polyethylene fiber has good moisture conductivity, but low moisture absorption, which is likely to cause stuffy sweating and is also prone to aging. In view of this, the present invention modifies the surface of the polyethylene fiber, and on the basis of ensuring the fiber strength, increases the moisture absorption and aging resistance of the fiber.

[0037] 3. The process for preparing the modified polyethylene fiber of the present invention includes: first, activating the fiber with hydrogen peroxide to increase the surface activity of the fiber; then treating it with an amino-silane coupling agent to graft a large amount of amino groups onto the surface of the fiber; thereafter, blending 2-furylacrolein with the fiber and carrying out an amine-aldehyde condensation reaction under the action of a catalyst to obtain a fiber with double bonds and Schiff bases on the surface; finally, carrying out a thiol-ene click chemical reaction between the fiber and 2-mercaptomethylbenzimidazole under ultraviolet irradiation to obtain a fiber with Schiff bases, thioether groups and benzimidazole groups on the surface.

[0038] 4. During the process of modifying the polyethylene fiber, the surface strength of the fiber will decrease after being treated with hydrogen peroxide. Subsequently, by introducing furyl groups, Schiff bases, thioether groups and benzimidazole groups onto the surface of the fiber, it is found through detection that not only the hygroscopicity and aging resistance of the fiber are enhanced, but also the strength of the fiber is improved to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The present invention will be further described with reference to the accompanying drawings. However, the embodiments in the drawings do not constitute any limitation to the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the following drawings.

[0040] Figure 1 It is a schematic flow chart of preparing the modified polyethylene fiber in Embodiment 1 of the present invention;

[0041] Figure 2 It is a schematic scanning electron microscope (SEM) diagram of preparing the modified polyethylene fiber in Embodiment 1 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] The technical solutions of the present invention will be described below through specific specific examples. It should be understood that one or more method steps mentioned in the present invention do not exclude the existence of other method steps before and after the combined steps or the insertion of other method steps between these clearly mentioned steps; it should also be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. Moreover, unless otherwise specified, the numbers of the method steps are only convenient tools for identifying the method steps, rather than limiting the arrangement order of the method steps or the scope of the present invention that can be implemented. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope that the present invention can implement.

[0043] To better understand the above technical solution, the exemplary embodiments of the present invention will be described in more detail below. Although the 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 so that the present invention can be more thoroughly understood and the scope of the present invention can be fully conveyed to those skilled in the art.

[0044] The present invention will be further described below in conjunction with the following embodiments.

[0045] Embodiment 1

[0046] A preparation method of a cool-sensation fiber knitted fabric, comprising the following steps:

[0047] Step 1, soak polyethylene fiber (number-average molecular weight of 2.3 million) in hydrogen peroxide with a mass fraction of 20%, the mass fraction ratio of polyethylene fiber to hydrogen peroxide is 1:15, stir at 35 °C for 3 h, then filter and collect the fiber, wash with pure water until the washing liquid is neutral, and after drying, obtain pretreated polyethylene fiber;

[0048] Step 2, mix the pretreated polyethylene fiber with an ethanol solution with a mass fraction of 50%, add the amino-silane coupling agent KH-550, the mass ratio of the pretreated polyethylene fiber, the amino-silane coupling agent and the ethanol solution is 1:0.4:15, heat up to 60 °C, keep warm for 4 h, after the treatment is over, filter and collect the fiber, rinse with water 3 times, and then dry to obtain amino-functionalized polyethylene fiber;

[0049] Step 3, weigh 2-furanacrolein (C7H6O2) and mix it with absolute ethanol, stir well until dissolved uniformly, add the amino-functionalized polyethylene fiber, the mass ratio of the amino-functionalized polyethylene fiber, 2-furanacrolein and absolute ethanol is 1:0.27:25, after dispersing uniformly, then add triethylamine (TEA) which is 5.5% of the mass of 2-furanacrolein as a catalyst, under the protection of nitrogen, heat up to 75 °C, reflux and stir for 5 h, after the reaction is over, remove the solvent under reduced pressure, wash with water 3 times, and then dry to obtain activated polyethylene fiber;

[0050] Step 4, weigh 2-mercaptomethylbenzimidazole (C8H8N2S) and mix it with absolute ethanol, stir until dissolved uniformly, then add the activated polyethylene fiber, the mass ratio of the activated polyethylene fiber, 2-mercaptomethylbenzimidazole and absolute ethanol is 1:0.36:25, introduce nitrogen as a protective gas, disperse uniformly at room temperature, then add the photoinitiator benzoin dimethyl ether (DMPA), the addition amount is 5% of the mass of 2-mercaptomethylbenzimidazole, at a wavelength of 365 nm and a light intensity of 20 mW / cm 2Under the irradiation of ultraviolet light, a stirring reaction was carried out for 1.8 h. After the reaction ended, the solvent was removed under reduced pressure. After washing with alcohol three times, it was dried to obtain modified polyethylene fibers (as shown in Figure 1 and Figure 2 );

[0051] Step 5: After treating the modified polyethylene fibers through the steps of opening, drawing, roving, spinning, winding, doubling, and twisting, modified polyethylene yarns with a specification of 50D / 72F were obtained;

[0052] Step 6: Using a weft knitting double-sided circular knitting machine, the modified polyethylene yarns were used as both warp and weft yarns at the same time for fabric knitting. The knitting method was a warp and weft regular knitting of one up and one down, that is, the yarns running in the weft direction were bent up and down segment by segment to form loops, and were successively threaded into the loops formed by the previous yarn, and were wound into a cloth in a cycle. Finally, a fabric with a warp density of 186 yarns / 10 cm and a weft density of 174 yarns / 10 cm was obtained.

[0053] Example 2

[0054] A preparation method of a cool-sensing fiber knitted fabric includes the following steps:

[0055] Step 1: Immerse polyethylene fibers (number average molecular weight of 1.2 million) in hydrogen peroxide with a mass fraction of 10%. The mass fraction ratio of polyethylene fibers to hydrogen peroxide is 1:10. After stirring at 25 °C for 1 h, the fibers were filtered and collected, washed with pure water until the washing liquid was neutral, and dried to obtain pretreated polyethylene fibers;

[0056] Step 2: Mix the pretreated polyethylene fibers with an ethanol solution with a mass fraction of 30%, add the amino silane coupling agent KH-550. The mass ratio of the pretreated polyethylene fibers, the amino silane coupling agent, and the ethanol solution is 1:0.2:10. Heat up to 50 °C and keep it warm for 2 h. After the treatment, the fibers were filtered and collected, rinsed with water twice, and dried to obtain amino-functionalized polyethylene fibers;

[0057] Step 3: Weigh 2-furanacrolein and mix it with anhydrous ethanol, stir well until dissolved evenly, add the amino-functionalized polyethylene fibers. The mass ratio of the amino-functionalized polyethylene fibers, 2-furanacrolein, and anhydrous ethanol is 1:0.18:20. After dispersing evenly, then add triethylamine with a mass of 3.5% of 2-furanacrolein as a catalyst. Under the protection of nitrogen, heat up to 70 °C and carry out reflux stirring for 2 h. After the reaction, the solvent was removed under reduced pressure, washed with water twice, and dried to obtain activated polyethylene fibers;

[0058] Step 4, Weigh 2-mercaptomethylbenzimidazole and mix it with absolute ethanol. After stirring until it is dissolved evenly, add activated polyethylene fiber. The mass ratio of activated polyethylene fiber, 2-mercaptomethylbenzimidazole and absolute ethanol is 1:0.24:20. Introduce nitrogen as the protective gas, disperse evenly at room temperature, then add the photoinitiator benzoin dimethyl ether, and the addition amount is 2% of the mass of 2-mercaptomethylbenzimidazole. Under the irradiation of ultraviolet light with a wavelength of 365 nm and an illumination intensity of 10 mW / cm 2 Stir and react under the irradiation of 2 . The reaction time is 0.6 h. After the reaction is completed, remove the solvent under reduced pressure, wash twice with alcohol, and then dry to obtain modified polyethylene fiber;

[0059] Step 5, After treating the modified polyethylene fiber through the steps of opening, drawing, roving, spinning, winding, warping, and twisting, obtain modified polyethylene yarn with a specification of 50D / 144F;

[0060] Step 6, Use a weft knitting double-sided circular knitting machine, use the modified polyethylene yarn as both the warp and weft yarns at the same time for fabric knitting. The knitting method is a warp and weft regular knitting of one up and one down, that is, the yarn running in the weft direction bends up and down section by section to form loops, and successively passes through the loops formed by the previous yarn, and is wound into cloth in a cycle, and finally obtain a fabric with a warp density of 175 roots / 10 cm and a weft density of 169 roots / 10 cm.

[0061] Example 3

[0062] A preparation method of a cool-sensation fiber knitted fabric, comprising the following steps:

[0063] Step 1, Immerse polyethylene fiber (number average molecular weight is 2.8 million) into hydrogen peroxide with a mass fraction of 30%. The mass fraction of polyethylene fiber and hydrogen peroxide is 1:20. Stir and process at 45 °C for 5 h, then filter and collect the fiber, wash with pure water until the washing liquid is neutral, and dry to obtain pretreated polyethylene fiber;

[0064] Step 2, Mix the pretreated polyethylene fiber with an ethanol solution with a mass fraction of 70%, add the amino-silane coupling agent KH-602. The mass ratio of pretreated polyethylene fiber, amino-silane coupling agent and ethanol solution is 1:0.6:20. Heat up to 70 °C and keep it warm for 6 h. After the treatment is completed, filter and collect the fiber, wash 5 times with water, and then dry to obtain amino-functionalized polyethylene fiber;

[0065] Step 3: Weigh 2-furylacrolein and anhydrous ethanol and mix them. Stir well until they are dissolved evenly. Then add amino-functionalized polyethylene fiber. The mass ratio of amino-functionalized polyethylene fiber, 2-furylacrolein and anhydrous ethanol is 1:0.36:30. After dispersing evenly, add triethylamine accounting for 8.5% of the mass of 2-furylacrolein as a catalyst. Under the protection of nitrogen, heat up to 80 °C and carry out reflux stirring for 8 h. After the reaction ends, remove the solvent under reduced pressure. Wash with water 5 times and then dry to obtain activated polyethylene fiber;

[0066] Step 4: Weigh 2-mercaptomethylbenzimidazole and anhydrous ethanol and mix them. Stir until they are dissolved evenly. Then add activated polyethylene fiber. The mass ratio of activated polyethylene fiber, 2-mercaptomethylbenzimidazole and anhydrous ethanol is 1:0.48:30. Introduce nitrogen as a protective gas and disperse evenly at room temperature. Then add photoinitiator benzophenone, and the addition amount is 7% of the mass of 2-mercaptomethylbenzimidazole. Under the irradiation of ultraviolet light with a wavelength of 365 nm and a light intensity of 30 mW / cm 2 and carry out a stirring reaction. The reaction time is 2.4 h. After the reaction ends, remove the solvent under reduced pressure. Wash with alcohol 5 times and then dry to obtain modified polyethylene fiber;

[0067] Step 5: After treating the modified polyethylene fiber through the steps of opening, drawing, roving, spinning, winding, doubling and twisting, obtain modified polyethylene yarn with a specification of 75D / 144F;

[0068] Step 6: Use a weft knitting double-sided circular knitting machine and use the modified polyethylene yarn as both the warp and weft yarns at the same time for fabric knitting. The knitting method is a warp and weft regular knitting of one up and one down, that is, the yarns running in the weft direction are bent up and down section by section to form loops, and successively pass through the loops formed by the previous yarn, and are wound into cloth in a cycle. Finally, obtain a fabric with a warp density of 175 - 193 pieces / 10 cm and a weft density of 169 - 187 pieces / 10 cm.

[0069] Comparative Example 1

[0070] A preparation method of a cool-sense fiber knitted fabric, the difference from Example 1 is only that the modified polyethylene fiber used in Example 1 is replaced with amino-functionalized polyethylene fiber, that is:

[0071] Step 1: Prepare amino-functionalized polyethylene fiber, which is the same as in Example 1;

[0072] Step 2: After treating the amino-functionalized polyethylene fiber through the steps of opening, drawing, roving, spinning, winding, doubling and twisting, obtain modified polyethylene yarn with a specification of 50D / 72F;

[0073] Step 3: Use the modified polyethylene yarn as both the warp and weft yarns to prepare a fabric at the same time, and the parameters are the same as in Example 1.

[0074] Comparative Example 2

[0075] A preparation method of a cool-sensation fiber knitted fabric, which is only different from Example 1 in that the modified polyethylene fiber used in Example 1 is replaced with an activated polyethylene fiber, that is:

[0076] Step 1, preparing activated polyethylene fiber, which is the same as that in Example 1;

[0077] Step 2, after treating the activated polyethylene fiber through the steps of opening, drawing, roving, spinning, winding, doubling, and twisting, a modified polyethylene yarn with a specification of 50D / 72F is obtained;

[0078] Step 3, using the modified polyethylene yarn as both the warp yarn and the weft yarn to prepare the fabric, and the parameters are the same as those in Example 1.

[0079] Comparative Example 3

[0080] A preparation method of a cool-sensation fiber knitted fabric, which is only different from Example 1 in that the preparation method of the modified polyethylene fiber is different, and the remaining steps are the same. The preparation method of the modified polyethylene fiber in this comparative example includes:

[0081] Step 1, preparing pretreated polyethylene fiber, which is the same as that in Example 1;

[0082] Step 2, mixing the pretreated polyethylene fiber, 2-furanacrolein, 2-mercaptomethylbenzimidazole, and absolute ethanol. The mass ratio of the pretreated polyethylene fiber, 2-furanacrolein, 2-mercaptomethylbenzimidazole, and absolute ethanol is 1:.27:.36:25. Nitrogen is introduced as a protective gas, and it is dispersed evenly at room temperature. Then add benzoin dimethyl ether with a mass of 5% of the 2-mercaptomethylbenzimidazole as a photoinitiator, and carry out a stirring reaction under the irradiation of ultraviolet light with a wavelength of 365nm and an illumination intensity of 20mW / cm 2 , and the reaction time is 1.8h. After the reaction is completed, remove the solvent under reduced pressure, wash with alcohol 3 times, and then dry to obtain the modified polyethylene fiber.

[0083] The properties of the fabrics prepared in Example 1 and Comparative Examples 1-3 were correspondingly detected. The detection items included breaking strength, moisture absorption and quick-drying property, and aging resistance. Specifically:

[0084] 1. Breaking strength. In this invention, only the breaking strength of the yarn is detected: under standard atmospheric conditions (20±2°C, 65±5%RH), three specimens of each type are taken, and referring to the standard of GB / T 3916-2013, the breaking strength of an equal-speed tensile tester is used, and the average value is taken.

[0085] 2. Moisture absorption and quick drying property: The detection standard refers to GB / T 21655.2-2009 "Textiles - Evaluation of moisture absorption and quick drying properties", and the specific levels refer to Table 1;

[0086] 3. Aging resistance: The detection standard refers to GB / T 31899-2015 "Textiles - Weathering test - Exposure to ultraviolet light". Specifically: Treat with ultraviolet light with an irradiance of 200 W / m 2 at a blackboard temperature of 60 °C for 120 h using a 340 nm UVA lamp, and detect the retention rate of breaking strength.

[0087] Table 1 Classification of moisture absorption and quick drying performance indicators

[0088]

[0089] The test results are shown in Table 2:

[0090] Table 2 Performance test results

[0091]

[0092] It can be seen from the test results in Table 2 that the fabric prepared in Example 1 of the present invention can not only maintain good moisture absorption and quick drying properties, but also have high strength and better aging resistance, indicating that the fabric prepared in Example 1 of the present invention has the advantages of high strength, moisture absorption and perspiration, and aging resistance.

[0093] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions 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 one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0094] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A preparation method of a cool-sensation fiber knitted fabric, characterized in that, It includes the following steps: Step 1: Immerse the polyethylene fiber in hydrogen peroxide, stir it, then filter, wash and dry it to obtain the pretreated polyethylene fiber; Step 2: Mix the pretreated polyethylene fiber and ethanol solution, add an amino-silane coupling agent, heat it, after the treatment is over, filter, rinse and dry it to obtain the aminated polyethylene fiber; Step 3: Mix the aminated polyethylene fiber, 2-furanacrolein and absolute ethanol, after dispersing them evenly, then add a catalyst, heat and react under the protection of nitrogen, after the reaction is over, remove the solvent, wash and dry it to obtain the activated polyester fiber; Step 4: Mix the activated polyester fiber, 2-mercaptomethyl benzimidazole and absolute ethanol, introduce nitrogen as the protective gas, add a photoinitiator, stir and react under the irradiation of ultraviolet light, after the reaction is over, remove the solvent, wash and dry it to obtain the modified polyethylene fiber; Step 5: Process the modified polyethylene fiber through the steps of opening, drawing, roving, spinning, winding, doubling and twisting to obtain the modified polyethylene yarn; Step 6: Use a weft knitting circular knitting machine to knit the modified polyethylene yarn to obtain a knitted fabric; In the said Step 1, the mass fraction of hydrogen peroxide is 10%-30%, and the mass ratio of polyethylene fiber to hydrogen peroxide is 1:10-20; In the said Step 2, the mass fraction of ethanol solution is 30%-70%, and the amino-silane coupling agent is KH-550 or KH-602; the mass ratio of pretreated polyethylene fiber, amino-silane coupling agent and ethanol solution is 1:0.2-0.6:10-20; In the said Step 3, the mass ratio of aminated polyethylene fiber, 2-furanacrolein and absolute ethanol is 1:0.18-0.36:20-30; the catalyst is triethylamine, and the addition amount is 3.5%-8.5% of the mass of 2-furanacrolein; In the said Step 4, the mass ratio of activated polyester fiber, 2-mercaptomethyl benzimidazole and absolute ethanol is 1:0.24-0.48:20-30; the photoinitiator is benzoin dimethyl ether or benzophenone, and the addition amount is 2%-7% of the mass of 2-mercaptomethyl benzimidazole.

2. The preparation method of a cool-sensation fiber knitted fabric according to claim 1, characterized in that, In the said Step 1, the treatment temperature is 25-45°C, and the treatment time is 1-5h.

3. The preparation method of a cool-sensation fiber knitted fabric according to claim 1, characterized in that, In the said Step 2, the treatment temperature is 50-70°C, and the treatment time is 2-6h.

4. The preparation method of a cool-sensation fiber knitted fabric according to claim 1, characterized in that, In the said Step 3, the temperature for the temperature-rising reaction is 70-80°C, and the time for the temperature-rising reaction is 2-8h.

5. The preparation method of a cool-sensation fiber knitted fabric according to claim 1, characterized in that, In the said step 4, the irradiation wavelength of the ultraviolet light is 365 nm, and the light intensity is 10 - 30 mW / cm 2 , and the stirring reaction time is 0.6 - 2.4 h.

6. The preparation method of a cool-sensation fiber knitted fabric according to claim 1, characterized in that, In the said Step 5, the specifications of the modified polyethylene yarn are one of 24D / 28F, 50D / 72F, 50D / 144F, 75D / 72F, 75D / 144F, 75D / 288F, 150D / 288F, 150D / 288F, 150D / 576F.

7. The preparation method of a cool-sensation fiber knitted fabric according to claim 1, characterized in that, In the said Step 6, the modified polyethylene yarn is used as both the warp and weft yarns, and the knitting method is the warp and weft regular knitting of one up and one down; the warp density of the fabric is 175-193 pieces / 10 cm, and the weft density is 169-187 pieces / 10 cm.

8. A cool-sensation fiber knitted fabric, characterized in that, The cool-sense fiber knitted fabric is prepared by the preparation method described in Claim 1.

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