Multifunctional cold-proof polar bear-like fiber and preparation method thereof

Abstract

The application discloses a preparation method of multifunctional cold-proof polar bear imitating fiber, and relates to the technical field of fibers.The modified polyolefin is sprayed out through the nozzle assembly into the centrifugal disc nozzle hole with a concentric shaft, and the polyethylene terephthalate is used as a core layer raw material to be co-spun, so that the core-shell structure fiber is formed, the tensile strength and wear resistance of the fiber are improved; and then the core layer is made into a porous structure through freeze drying, so that the cold-proof effect of the polar bear imitating fiber is achieved.The modified polyolefin is obtained by the common polymerization of 2,3-dibenzyl-1,3-butadiene, bis(2-methylallyl) carbonate and allyl urea, has a curled molecular structure, prevents water vapor from penetrating, realizes the cold-proof effect, and indirectly improves the warm-keeping effect, mechanical strength and wear resistance of the fiber.The fiber has a hollow porous form, an apparent structure imitating polar bear hair, and the characteristics of warm-keeping, light absorption and heating, temperature locking, hydrophobicity and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fibers, in particular to a multifunctional cold-keeping polar bear-like fiber and a preparation method thereof. BACKGROUND

[0002] With the continuous development of economic society and industrial technology, the pace of human exploration of unknown fields is accelerating, and it is no longer satisfied with only activities in moderate environments, which puts higher and higher requirements on the performance of related materials. Preparing new materials with excellent performance, such as lightweight, high-strength and high-toughness structural materials, load-bearing or heat-insulating materials that maintain performance stability in extreme high-temperature or low-temperature environments, and fatigue-resistant materials under long-term load or cyclic strain are the goals that researchers in the field of materials have been pursuing. However, due to the complexity of the preparation process, the harsh preparation conditions, and the difficulty in obtaining raw materials, the synthesis and preparation of materials with high performance have always been one of the research focuses and difficulties in the field of materials science.

[0003] Polar bear hair, as a kind of animal hair with special hollow porous structure, has been the object of research and imitation by researchers in the field of materials science. By imitating the characteristics of polar bear hair and fur, researchers have prepared polar bear-like fibers, aerogels, and solar radiation collection devices using different methods, which play an important role in heat insulation, energy collection, and other fields. However, the current manufacturing process of polar bear-like fibers focuses more on the imitation of their microstructure, such as constructing similar hollow fiber morphology through various methods to effectively trap air and enhance the warmth retention effect. However, this focus on structural imitation often overlooks the relationship between the inherent properties of the fiber material and its wear resistance. In daily use and some special application scenarios, fabrics are inevitably subjected to friction. Due to its relatively loose structure and possible sacrifice of strength in material selection for warmth, polar bear-like fibers are prone to wear, fuzzing, and even breaking on the surface during repeated friction. This lack of wear resistance not only affects the appearance integrity of the fabric, making it lose its original beauty and texture, but more importantly, it gradually damages the structure of the fiber, leading to a decline in warmth retention performance. SUMMARY

[0004] The present application relates to the technical field of fibers, in particular to a multifunctional cold-keeping polar bear-like fiber and a preparation method thereof.

[0005] To solve the above technical problems, the present application provides the following technical scheme: a preparation method of a multifunctional cold-keeping polar bear-like fiber, comprising the following preparation steps:

[0006] (1) Under the protection of nitrogen, 10-20 parts of 2,3-dibenzyl-1,3-butadiene, 13-21 parts of bis(2-methylallyl) carbonate, 18-32 parts of allyl urea, 65-175 parts of tetrahydrofuran are uniformly mixed, 0.8-1.4 parts of bis(1,5-cyclooctadiene) nickel catalyst is added, and the reaction is carried out at 40-60℃, 100 rpm for 16-24h. After the reaction is completed, air is connected, the temperature is lowered to 20℃, and the solid is filtered, washed with ethanol for 3 times, and placed in a 30-40℃ oven for drying for 10-18h to prepare the modified polyolefin;

[0007] (2) 45-65 parts of the modified polyolefin, 1-3 parts of the plasticizer, and 2-4 parts of the antioxidant are uniformly mixed, and are extruded and cut into particles after mixing, with a material head temperature of 120-150℃, a screw rotation speed of 180-220r / min, an extrusion pressure of 7-11MPa, and a shear rate of 130-210s -1 , to prepare the modified polyolefin particles;

[0008] (3) The modified polyolefin particles are placed in the shell layer feeder of the spinning machine, and the core layer raw material is placed in the core layer feeder of the spinning machine. The two are jointly melted and sprayed through the centrifugal disc nozzle at a rotation speed of 2000-2500rpm at different temperatures, and are freeze-dried. After drying is completed, nitrogen is introduced, the temperature and pressure are restored to normal, and the product is cut to prepare the multifunctional cold-protecting polar bear-like fiber.

[0009] Further, the plasticizer in step (2) is any one or a mixture of multiple of cyclobutane ester, cyclohexane ester, polyoxyethylene ester, and dibutyl itaconate.

[0010] Further, the antioxidant in step (2) is any one or a mixture of multiple of antioxidant 1010, bisphenol A phosphite, and Irganox 168.

[0011] Further, the preparation step of the core layer raw material in step (3) is: 10-20 parts of polyethylene terephthalate and 1-3 parts of graphene are mixed and cut into particles at 270-280℃, then soaked in 50-120 parts of dimethylformamide for 2-4h, and washed with deionized water for 3 times to prepare the core layer raw material.

[0012] Further, the molecular weight of the polyethylene terephthalate is 8000-10000.

[0013] Further, the different temperatures in step (3) are a core layer spinning screw temperature of 275-285℃ and a shell layer spinning screw temperature of 160-170℃.

[0014] Further, the volume ratio of the modified polyolefin particles to the core layer raw material in step (3) is 1:(1.7-2.3).

[0015] Further, the freezing and drying step in step (3) is: cooling to -20~-40℃ at 5℃ / min, vacuumizing to -0.1~-0.08MPa, and lasting for 20~40h.

[0016] Further, the diameter of the multifunctional cold-keeping polar bear-like fiber is 0.5~5μm.

[0017] Further, the multifunctional cold-keeping polar bear-like fiber is prepared according to any one of the above preparation methods.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] In the present application, modified polyolefin is used as the shell layer raw material, and polyethylene terephthalate is used as the core layer raw material, and they are spun together, and then are sprayed out through the melt nozzle of the centrifugal disc with concentric shafts, so that the hollow fibers are obtained, the fibers are arranged more regularly in space, so that the external force is more effectively transmitted and dispersed, and the wear resistance of the fibers is enhanced, and the core and the shell material are combined through hydrogen bond to form a connection, so that the tensile strength of the fiber is improved; and then, through freezing and drying, the core layer forms a porous structure, the effect of polar bear-like hair is achieved, the hot air can be locked in the cavity of the fiber, and the light energy can be stored, so that the body is kept warm, and the cold-keeping effect is achieved.

[0020] Secondly, the modified polyolefin is obtained by the polymerization of 2,3-dibenzyl-1,3-butadiene, bis(2-methylallyl) carbonate and allyl urea, has a curled molecular structure, can prevent cold water vapor from penetrating into the skin, and thus plays a cold-keeping role; the 2,3-dibenzyl-1,3-butadiene contains multiple rigid benzene rings, has good thermal stability, prevents the performance of the fiber from being reduced due to temperature fluctuation, and indirectly improves the cold-keeping effect and mechanical strength of the fiber; the ester group introduced by the bis(2-methylallyl) carbonate can interfere with the regular arrangement of the molecular chain of the fiber, reduce the crystallinity of the fiber, improve the softness of the fiber, reduce the roughness of the surface of the fiber, reduce the friction, and improve the wear resistance; the presence of the urea group in the allyl urea can enhance the interaction between the molecular chains of the fiber, and when the fiber is rubbed, the molecular structure around the urea group can disperse the friction, prevent the molecular chains on the surface of the fiber from being easily cut or worn, and thus improve the wear resistance. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] In order to more clearly illustrate the method provided by the present application, the following examples are used to illustrate the method in detail. The test methods of various indexes of the multifunctional cold-protecting polar bear fiber prepared in the following examples are as follows:

[0023] Thermal retention rate: The same weight of the examples and the comparative examples was used to prepare the same specification of the composite fiber non-woven fabric (400 g / m 2 ) by the same process (hot rolling process). The thermal retention rate was tested according to the standard GB / T 11048-1989. The standard state human body temperature was set to 36.7℃. The constant temperature difference heat dissipation method was used to calculate the thermal retention rate by the computer.

[0024] Tensile strength: The same weight of the examples and the comparative examples was used to prepare the same specification of the composite fiber non-woven fabric (400 g / m 2 ) by the same process (hot rolling process). The tensile strength was tested according to the standard ASTM D638 on the universal tensile testing machine. The tensile test rate was 45 mm / min.

[0025] Wear resistance: The same weight of the examples and the comparative examples was used to prepare the same specification of the composite fiber non-woven fabric (400 g / m 2 ) by the same process (hot rolling process). The wear resistance was tested according to the standard GB / T 21196.2-2007 using the Martindale wear resistance testing machine with a friction load mass of 797±7 g. The sample was continuously rubbed until it was worn out.

[0026] Light absorption and heat generation: The same weight of the examples and the comparative examples was used to prepare the same specification of the composite fiber non-woven fabric (400 g / m 2 ) by the same process (hot rolling process). The light absorption and heat generation were tested according to the standard GB / T 18319. The test results were expressed as the average temperature rise value.

[0027] Hydrophobicity: The same weight of the examples and the comparative examples was used to prepare the same specification of the composite fiber non-woven fabric (400 g / m 2 ) by the same process (hot rolling process). A 3 μl drop of deionized water was slowly dropped on the surface of the sample. Once the water drop contacted the fabric, the movement of the water drop was recorded by a camera. The water contact angle was measured by a water contact angle measuring instrument. The test was repeated three times and the average value was taken.

[0028] Example 1: (1) Under nitrogen protection, 10 parts of 2,3-dibenzyl-1,3-butadiene, 13 parts of bis(2-methylallyl) carbonate, 18 parts of allyl urea, and 65 parts of tetrahydrofuran were uniformly mixed. 0.8 parts of bis(1,5-cyclooctadiene) nickel catalyst was added. The reaction was carried out at 40℃ and 100 rpm for 16h. After the reaction was completed, air was connected, the temperature was lowered to 20℃, and the solid was filtered and washed with ethanol for 3 times. It was dried in a 30℃ oven for 10h to prepare the modified polyolefin.

[0029] (2) 45 parts of modified polyolefin, 1 part of cyclohexane ester, 2 parts of antioxidant 1010 were uniformly mixed, and were mixed and extruded to cut into particles, with a material head temperature of 120°C, a screw rotation speed of 180 r / min, an extrusion pressure of 7 MPa, and a shear rate of 130 s -1 , to obtain modified polyolefin particles;

[0030] (3) After 10 parts of polyethylene terephthalate with a molecular weight of 8000 and 1 part of graphene were mixed and cut into particles at 270°C, they were soaked in 50 parts of dimethylformamide for 2 h, and then washed with deionized water for 3 times, to obtain a core layer raw material;

[0031] (4) The modified polyolefin particles were placed in a shell layer feeder of a spinning machine, and the core layer raw material was placed in a core layer feeder of the spinning machine, wherein the volume ratio of the modified polyolefin particles to the core layer raw material was 1:1.7, and the core layer spinning screw temperature was 275°C and the shell layer spinning screw temperature was 160°C, and the particles were jointly melted and sprayed through the nozzle of a centrifugal disc with a rotation speed of 2000 rpm, and then cooled to -20°C at a rate of 5°C / min, and then vacuumized to -0.1 MPa for 20 h, and then dried, and then nitrogen was introduced to restore to normal temperature and pressure, and then cut off, to obtain multifunctional cold-keeping polar bear-like fibers; the diameter of the multifunctional cold-keeping polar bear-like fibers was 0.5 μm.

[0032] Example 2: (1) Under the protection of nitrogen, 15 parts of 2,3-dibenzyl-1,3-butadiene, 17 parts of bis(2-methylallyl) carbonate, 25 parts of allyl urea, and 120 parts of tetrahydrofuran were uniformly mixed, 1.1 parts of bis(1,5-cyclooctadiene) nickel catalyst was added, and the mixture was reacted at 50°C and 100 rpm for 20 h, then air was introduced, the temperature was lowered to 20°C, the solid was filtered, washed with ethanol for 3 times, and then dried in an oven at 35°C for 14 h, to obtain modified polyolefin;

[0033] (2) 55 parts of modified polyolefin, 5 parts of polyoxyethylene ester, and 3 parts of bisphenol A phosphite were uniformly mixed, and were mixed and extruded to cut into particles, with a material head temperature of 135°C, a screw rotation speed of 200 r / min, an extrusion pressure of 9 MPa, and a shear rate of 170 s -1 , to obtain modified polyolefin particles;

[0034] (3) After 15 parts of polyethylene terephthalate with a molecular weight of 9000 and 2 parts of graphene were mixed and cut into particles at 275°C, they were soaked in 85 parts of dimethylformamide for 3 h, and then washed with deionized water for 3 times, to obtain a core layer raw material;

[0035] (4) the modified polyolefin particles are placed in a shell layer feeder of a spinning machine, the core layer raw material is placed in a core layer feeder of the spinning machine, wherein the volume ratio of the modified polyolefin particles to the core layer raw material is 1:2, the core layer spinning screw temperature is 280°C, the shell layer spinning screw temperature is 165°C, the centrifugal disc nozzle rotation speed is 2250 rpm, the temperature is lowered to -30°C at a rate of 5°C / min, the vacuum degree is -0.09 MPa, the drying is continued for 30 h, nitrogen is introduced after the drying is completed, the temperature and pressure are returned to normal, and the multifunctional cold-keeping polar bear-like fiber is obtained by cutting; the diameter of the multifunctional cold-keeping polar bear-like fiber is 2.75 μm.

[0036] Example 3: (1) 20 parts of 2,3-dibenzyl-1,3-butadiene, 21 parts of bis(2-methylallyl) carbonate, 32 parts of allyl urea, 175 parts of tetrahydrofuran are uniformly mixed, 1.4 parts of bis(1,5-cyclooctadiene) nickel catalyst is added, and the mixture is reacted at 60°C and 100 rpm for 24 h. After the reaction is completed, air is connected, the temperature is lowered to 20°C, the solid is filtered, washed with ethanol for 3 times, and placed in a 40°C oven for drying for 18 h to obtain a modified polyolefin;

[0037] (2) 65 parts of the modified polyolefin, 3 parts of dibutyl itaconate, and 2 parts of Irganox 168 are uniformly mixed, and are subjected to mixing, extrusion, and granulation, wherein the material head temperature is 150°C, the screw rotation speed is 220 r / min, the extrusion pressure is 11 MPa, and the shear rate is 210 s -1 ; and a modified polyolefin particle is obtained;

[0038] (3) 20 parts of polyethylene terephthalate with a molecular weight of 10000 and 3 parts of graphene are mixed and granulated at 280°C, then soaked in 120 parts of dimethylformamide for 4 h, and washed with deionized water for 3 times to obtain a core layer raw material;

[0039] (4) the modified polyolefin particles are placed in a shell layer feeder of a spinning machine, the core layer raw material is placed in a core layer feeder of the spinning machine, wherein the volume ratio of the modified polyolefin particles to the core layer raw material is 1:2.3, the core layer spinning screw temperature is 285°C, the shell layer spinning screw temperature is 170°C, the centrifugal disc nozzle rotation speed is 2500 rpm, the temperature is lowered to -40°C at a rate of 5°C / min, the vacuum degree is -0.08 MPa, the drying is continued for 40 h, nitrogen is introduced after the drying is completed, the temperature and pressure are returned to normal, and the multifunctional cold-keeping polar bear-like fiber is obtained by cutting; the diameter of the multifunctional cold-keeping polar bear-like fiber is 5 μm.

[0040] Comparative Example 1: Comparative Example 1 differs from Example 2 in that there is no centrifugal disc nozzle, specifically step (4) is changed to: the modified polyolefin particles are placed in the shell layer feeder of the spinning machine, and the core layer raw material is placed in the core layer feeder of the spinning machine, wherein the volume ratio of the modified polyolefin particles to the core layer raw material is 1:2, and the core layer spinning screw temperature is 280°C and the shell layer spinning screw temperature is 165°C, and the modified polyolefin particles and the core layer raw material are jointly melt sprayed, the temperature is lowered to -30°C at a rate of 5°C / min, vacuum is drawn to a degree of -0.09 MPa, and the drying is continued for 30 h, after the drying is completed, nitrogen is introduced, and the temperature and pressure are returned to normal, and the product is cut off to obtain a multifunctional cold-protecting polar bear-like fiber; the diameter of the multifunctional cold-protecting polar bear-like fiber is 2.75 μm. The remaining steps are the same as those of Example 2.

[0041] Comparative Example 2: Comparative Example 2 differs from Example 2 in that no freeze drying is performed, specifically step (4) is changed to: the modified polyolefin particles are placed in the shell layer feeder of the spinning machine, and the core layer raw material is placed in the core layer feeder of the spinning machine, wherein the volume ratio of the modified polyolefin particles to the core layer raw material is 1:2, and the core layer spinning screw temperature is 280°C and the shell layer spinning screw temperature is 165°C, and the modified polyolefin particles and the core layer raw material are jointly melt sprayed through the centrifugal disc nozzle at a rotation speed of 2250 rpm, and the product is cut off after being naturally cooled to room temperature to obtain a multifunctional cold-protecting polar bear-like fiber; the diameter of the multifunctional cold-protecting polar bear-like fiber is 2.75 μm. The remaining steps are the same as those of Example 2.

[0042] Comparative Example 3: Comparative Example 3 differs from Example 2 in that step (1) is different, and step (1) is changed to: under the protection of nitrogen, 17 parts of bis(2-methylallyl) carbonate, 25 parts of allyl urea, and 120 parts of tetrahydrofuran are uniformly mixed, 1.1 parts of bis(1,5-cyclooctadiene) nickel catalyst is added, and the reaction is carried out at 50°C and 100 rpm for 20 h, after the reaction is completed, air is introduced, the temperature is lowered to 20°C, the solid is filtered, washed with ethanol for 3 times, and placed in a 35°C oven for drying for 14 h to obtain a modified polyolefin. The remaining steps are the same as those of Example 2.

[0043] Comparative Example 4: Comparative Example 4 differs from Example 2 in that step (1) is different, and step (1) is changed to: under the protection of nitrogen, 15 parts of 2,3-dibenzyl-1,3-butadiene, 25 parts of allyl urea, and 120 parts of tetrahydrofuran are uniformly mixed, 1.1 parts of bis(1,5-cyclooctadiene) nickel catalyst is added, and the reaction is carried out at 50°C and 100 rpm for 20 h, after the reaction is completed, air is introduced, the temperature is lowered to 20°C, the solid is filtered, washed with ethanol for 3 times, and placed in a 35°C oven for drying for 14 h to obtain a modified polyolefin. The remaining steps are the same as those of Example 2.

[0044] Comparative Example 5: Comparative Example 5 differs from Example 2 in that Step (1) is changed to: under nitrogen protection, 15 parts of 2,3-dibenzyl-1,3-butadiene, 17 parts of bis(2-methylallyl) carbonate, 120 parts of tetrahydrofuran are mixed uniformly, 1.1 parts of bis(1,5-cyclooctadiene) nickel catalyst is added, and the reaction is carried out at 50°C, 100 rpm for 20h. After the reaction is completed, air is connected, the temperature is lowered to 20°C, and the solid is filtered, washed with ethanol 3 times, and dried in a 35°C oven for 14h to obtain the modified polyolefin. The remaining steps are the same as Example 2.

[0045] Effect Example

[0046] The performance analysis results of the multifunctional cold-resistant polar bear-like fibers using Examples 1 to 3 and Comparative Examples 1 to 5 of the present application are shown in Table 1 below.

[0047] Table 1

[0048]

[0049] From the experimental data comparison of Examples 1, 2, 3 and Comparative Example 1, it can be found that the fibers are arranged more regularly in space by melt spinning under centrifugal action, thereby more effectively transmitting and dispersing external force, and enhancing the wear resistance of the fibers. From the experimental data comparison of Examples 1, 2, 3 and Comparative Example 2, it can be found that the core layer forms a porous structure by freeze-drying, achieving the effect of polar bear-like fur, which can lock hot air in the cavity of the fiber and store light energy, achieving the effect of keeping the body warm and achieving the effect of cold resistance. From the experimental data comparison of Examples 1, 2, 3 and Comparative Example 3, it can be found that 2,3-dibenzyl-1,3-butadiene contains multiple rigid benzene rings, which has good thermal stability, preventing the performance of the fiber from being reduced due to temperature fluctuations, and improving the warmth-keeping effect and mechanical strength of the fiber. From the experimental data comparison of Examples 1, 2, 3 and Comparative Example 4, it can be found that the ester group introduced by bis(2-methylallyl) carbonate can interfere with the regular arrangement of the molecular chains of the fiber, reduce the crystallinity of the fiber, improve the softness of the fiber, and at the same time reduce the roughness of the fiber surface, reduce the friction, and improve the wear resistance. From the experimental data comparison of Examples 1, 2, 3 and Comparative Example 5, it can be found that the presence of urea groups in allyl urea can enhance the interaction between the molecular chains of the fiber, and when subjected to friction, the molecular structure around the urea groups can disperse the friction force, preventing the molecular chains on the surface of the fiber from being easily cut or worn, thereby improving the wear resistance.

[0050] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. The embodiments should therefore be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference herein to any prior patents or applications shall be taken as an admission that the application is not entitled to antedate such prior patents or applications by virtue of prior application. Any reference to the use of a term in the singular herein shall be taken as an acknowledgment of the existence of the term in the plural and vice versa.

Claims

1. A method for preparing a multifunctional cold-weather polar bear-like fiber, characterized by, The preparation steps include: (1) Under nitrogen protection, 10-20 parts of 2,3-dibenzyl-1,3-butadiene, 13-21 parts of bis(2-methylallyl) carbonate, 18-32 parts of allyl urea, 65-175 parts of tetrahydrofuran are uniformly mixed, 0.8-1.4 parts of a catalyst is added, and the mixture is reacted at 40-60°C for 16-24 hours. After the reaction is completed, air is connected, the temperature is lowered to 20°C, and the solid is filtered, washed with ethanol for 3 times, and dried in an oven at 30-40°C for 10-18 hours to obtain modified polyolefin; (2) mixing 45-65 parts of the modified polyolefin, 1-3 parts of the plasticizer and 2-4 parts of the antioxidant uniformly, and granulating by mixing and extruding, wherein the temperature of the material head is 120-150°C, the screw rotation speed is 180-220 r / min, the extrusion pressure is 7-11 MPa, and the shearing rate is 130-210 s -1 , to obtain the modified polyolefin granules; (3) mixing 45-65 parts of the modified polyolefin, 1-3 parts of the plasticizer, 2-4 parts of the antioxidant and 0.1-0.3 parts of the lubricant uniformly, and granulating by mixing and extruding, wherein the temperature of the material head is 120-150°C, the screw rotation speed is 180-220 r / min, the extrusion pressure is 7-11 MPa, and the shearing rate is 130-210 s <000 (3) After 10-20 parts of polyethylene terephthalate and 1-3 parts of graphene are mixed and cut into particles at 270-280°C, the particles are soaked in 50-120 parts of dimethylformamide for 2-4 hours, washed with deionized water for 3 times to obtain core layer raw material; the modified polyolefin particles are placed in the shell layer feeder of the spinning machine, and the core layer raw material is placed in the core layer feeder of the spinning machine. The particles are sprayed out through the nozzle of the centrifugal disc with a rotating speed of 2000-2500 rpm at different temperatures, and then freeze-dried. After drying, nitrogen is introduced, the temperature and pressure are restored to normal, and the product is cut to obtain multifunctional cold-resistant polar bear-like fiber.

2. The method for preparing multifunctional cold-keeping polar bear-like fiber according to claim 1, characterized in that, The catalyst in step (1) is bis(1,5-cyclooctadiene) nickel.

3. The method for preparing multifunctional cold-keeping polar bear-like fiber according to claim 1, characterized in that, The plasticizer in step (2) is any one or a mixture of multiple of cyclobutane ester, cyclohexane ester, polyoxyethylene ester, and dibutyl itaconate.

4. The method for preparing multifunctional cold-keeping polar bear-like fiber according to claim 1, characterized in that, The antioxidant in step (2) is any one or a mixture of multiple of antioxidant 1010, bisphenol A phosphite, and Irganox 168.

5. The method for preparing multifunctional cold-keeping polar bear-like fiber according to claim 1, characterized in that, The molecular weight of the polyethylene terephthalate in step (3) is 8000-10000.

6. The method for preparing multifunctional cold-keeping polar bear-like fiber according to claim 1, characterized in that, The different temperatures in step (3) are 275-285°C for the core layer spinning screw and 160-170°C for the shell layer spinning screw.

7. The method for preparing multifunctional cold-keeping polar bear-like fiber according to claim 1, characterized in that, The volume ratio of the modified polyolefin particles to the core layer raw material in step (3) is 1: (1.7-2.3).

8. The method for preparing multifunctional cold-keeping polar bear-like fiber according to claim 1, characterized in that, The freeze-drying step in step (3) is: cooling at a rate of 5°C / min to -20 to -40°C, vacuumizing to a degree of -0.1 to -0.08 MPa, and maintaining for 20-40 hours.

9. The method for preparing multifunctional cold-keeping polar bear-like fiber according to claim 1, characterized in that, The diameter of the multifunctional cold-resistant polar bear-like fiber is 0.5-5 μm.

10. The method for preparing a multifunctional cold-resistant polar bear-inspired fiber according to claim 1, characterized in that, The modified polyolefin particles include the following components by mass fraction: 45-65 parts of modified polyolefin, 1-3 parts of plasticizer, and 2-4 parts of antioxidant.

11. The multifunctional cold-weather polar bear-like fiber produced according to the method of any one of claims 1-10, wherein, The fiber is prepared by placing the modified polyolefin particles in the shell layer feeder of the spinning machine, placing the core layer raw material in the core layer feeder of the spinning machine, and then spraying out through the nozzle of the centrifugal disc.

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