Preparation method and application of degradable ultra-high molecular weight polyethylene fiber

Abstract

The invention discloses a preparation method and application of degradable ultra-high molecular weight polyethylene fiber. The preparation method comprises the following steps: S1: mixing a polyester polymer with a good solvent to obtain a polyester polymer solution, then mixing the polyester polymer solution with inorganic nanoparticles to prepare a blended solution, and mixing the blended solution with a non-good solvent to obtain nano-microspheres; S2: mixing a high molecular weight polymer with an organic solvent to obtain a high molecular weight polymer molten liquid; S3: thermally melting the nano-microspheres and the high molecular weight polymer molten liquid to obtain a spinning solution; S4: cooling, solidifying, extracting, and stretching the spinning solution to obtain a degradable ultra-high molecular weight polyethylene fiber. The degradable ultra-high molecular weight polyethylene fiber prepared by the preparation method has excellent elongation at break and breaking strength, can be better applied to marine fishing nets, and its excellent degradability can avoid environmental pollution, thus belonging to a green and environmentally friendly fiber.

Description

Technical Field

[0001] The present invention relates to the technical field of composite fiber production, with classification number D01F8 / 14, and specifically to a preparation method and application of degradable ultra-high molecular weight polyethylene fiber. Background Art

[0002] Current fishing nets are typically made from synthetic fibers such as polyamide and polyvinylidene chloride. However, these fibers are not easily degraded in the natural environment. If abandoned in the ocean, they pose a significant threat to marine life and the marine environment. To address this issue, scientists have developed biodegradable materials such as polylactic acid (PLA) to produce corresponding fishing net materials. However, the mechanical properties of conventionally spun PLA fibers are poor and cannot meet the needs of practical applications. Therefore, small amounts of biodegradable polymers such as starch, polyglycolic acid, polybutylene succinate, or cellulose acetate are typically added to the polyethylene (PE) spinning system. This improves mechanical properties while also utilizing the biodegradable polymers to promote PE degradation. Catalytic degradation uses high-energy radiation or chemical catalysts to break PE molecular chains, degrading them into low-molecular-weight compounds that can ultimately be digested by microorganisms.

[0003] Therefore, this application intends to improve the degradation performance of ultra-high molecular weight polyethylene fibers through the synergistic effect of biodegradable polymer blending and photocatalysis. First, a degradation modifier with synergistic degradation effect is prepared, and then the catalytic degradation agent is uniformly blended with ultra-high molecular weight polyethylene to prepare a degradable ultra-high molecular weight polyethylene masterbatch. Then, the blended gel spinning technology is used to prepare the degradable ultra-high molecular weight polyethylene fibers, which not only improves the mechanical properties of the fibers, but also improves the degradation performance of the fibers.

[0004] Patent CN107237001B provides a starch-modified polylactic acid monofilament for fishing and a preparation method thereof. By mixing polylactic acid, starch, and nano-silica, the breaking strength and knot strength of the polylactic acid fiber are enhanced, but its breaking strength is only 3.2 cN / dtex, which cannot meet the needs of practical applications. Summary of the Invention

[0005] In order to solve the above problems, the first aspect of the present invention provides a method for preparing a degradable ultra-high molecular weight polyethylene fiber, the steps of which are as follows:

[0006] S1: mixing a polyester polymer with a good solvent to obtain a polyester polymer solution, then mixing the polyester polymer solution with inorganic nanoparticles and stirring at a stirring speed of 1000-2000 rpm / min for 3-6 hours to obtain a blended solution, then mixing the blended solution with a non-good solvent and precipitating for 20-24 hours, filtering, and drying in a vacuum drying oven for 5-6 hours to obtain nanospheres;

[0007] S2: mixing a high molecular weight polymer and an organic solvent in a weight ratio of (8-10):1, and stirring at a stirring speed of 500-600 rpm / min for 10-15 minutes to obtain a high molecular weight polymer molten liquid;

[0008] S3: adding the nanospheres to a high molecular weight polymer swellable solution, and then adding an organic solvent and performing thermal melting at a temperature of 120-160° C. for 2-5 hours to obtain a spinning solution with a mass fraction of 5-10%;

[0009] S4: Using the gel spinning process, the spinning solution is added to the spinning device, the spinning temperature is set to 200-250°C, the spinning speed is 500-1000m / min, and then the temperature is reduced to 10-20°C for cooling and solidification to obtain a spindle, and the spindle is extracted in an extraction solvent of n-hexane, ethylene glycol and isopropanol in a weight ratio of (2-4):1:1. The extraction time is 10-20min. After that, the extracted spindle is stretched 4-8 times at a temperature of 50-90°C, and then stretched 8-12 times at a temperature of 100-120°C.

[0010] Further preferably, the good solvent includes at least one of dichloromethane, chloroform, dichloroethane, acetone, toluene, tetrahydrofuran, dioxane, and N,N-dimethylformamide; the non-good solvent includes at least one of ethanol, isopropanol, and hexane; and the organic solvent includes at least one of white oil, decalin, paraffin oil, and petroleum ether.

[0011] More preferably, the good solvent is chloroform, the non-good solvent is ethanol, and the organic solvent is decalin.

[0012] Preferably, the mass fraction of the polyester polymer solution is 6-20%.

[0013] More preferably, the mass fraction of the polyester polymer solution is 10-20%.

[0014] Further preferably, the mass fraction of the polyester polymer solution is 15%.

[0015] More preferably, the polyester polymer includes at least one of polylactic acid, poly 3-hydroxyalkanoate, poly ε-caprolactone and polybutylene succinate.

[0016] More preferably, the polyester polymer is polylactic acid.

[0017] Preferably, the mass ratio of the polyester polymer to the inorganic nanoparticles in step S1 is (0.05-0.2):1.

[0018] More preferably, the mass ratio of the polyester polymer to the inorganic nanoparticles in step S1 is (0.1-0.2):1.

[0019] More preferably, the mass ratio of the polyester polymer to the inorganic nanoparticles in step S1 is 0.15:1.

[0020] Preferably, the volume ratio between the mixed solution and the non-good solvent in step S1 is 1:(1-5).

[0021] Further preferably, in step S1, the volume ratio between the mixed solution and the non-good solvent is 1:(2-4).

[0022] Further preferably, in step S1, the volume ratio between the mixed solution and the non-good solvent is 1:3.

[0023] Preferably, the polyester polymer has a weight average molecular weight of 50,000-200,000 and a melt index of 15-30 g / 10 min (210° C., 2.16 kg).

[0024] More preferably, the polyester polymer has a weight average molecular weight of 50,000-150,000 and a melt index of 20-30 g / 10 min (210° C., 2.16 kg).

[0025] More preferably, the polyester polymer has a weight average molecular weight of 100,000 and a melt index of 22 g / 10 min (210° C., 2.16 kg).

[0026] Preferably, the average particle size of the inorganic nanoparticles is 50-100 nm.

[0027] More preferably, the average particle size of the inorganic nanoparticles is 50-70 nm.

[0028] More preferably, the average particle size of the inorganic nanoparticles is 60 nm.

[0029] More preferably, the inorganic nanoparticles are at least one of titanium dioxide, ferric oxide, tungsten trioxide, tin dioxide, copper oxide, aluminum oxide and zinc oxide.

[0030] More preferably, the inorganic nanoparticles are titanium dioxide.

[0031] Preferably, the high molecular weight polymer has a molecular weight of 1.3-1.6 million and a melt index of 1-5 g / 10 min (190° C., 10 kg).

[0032] More preferably, the high molecular weight polymer has a molecular weight of 1.4-1.6 million and a melt index of 1-3 g / 10 min (190° C., 10 kg).

[0033] More preferably, the high molecular weight polymer has a molecular weight of 1.5 million and a melt index of 2 g / 10 min (190° C., 10 kg).

[0034] More preferably, the high molecular weight polymer is ultra-high molecular weight polyethylene.

[0035] Preferably, the mass ratio between the nanospheres and the high molecular weight polymer molten liquid is (0.01-0.1):1.

[0036] Further preferably, the mass ratio between the nanospheres and the high molecular weight polymer molten liquid is (0.02-0.07):1.

[0037] Further preferably, the mass ratio between the nanospheres and the high molecular weight polymer molten liquid is (0.03-0.06):1.

[0038] Further preferably, the mass ratio between the nanospheres and the high molecular weight polymer molten liquid is 0.05:1.

[0039] Preferably, the specific step of stretching in step S4 is: stretching the extracted spun yarn by 4-8 times at a temperature of 50-90°C, and then stretching it by 8-12 times at a temperature of 100-120°C.

[0040] More preferably, the specific step of stretching in step S4 is: stretching the extracted spun yarn by 5-7 times at a temperature of 60-80°C, and then stretching it by 9-11 times at a temperature of 110-120°C.

[0041] More preferably, the specific step of stretching in step S4 is: stretching the extracted spun yarn 6 times at a temperature of 70°C, and then stretching it 10 times at a temperature of 115°C.

[0042] A second aspect of the present invention provides an application of a method for preparing degradable high molecular weight polyethylene fibers in fishing nets.

[0043] Nano-titanium dioxide is rich in hydroxyl groups on its surface and is prone to agglomeration, which greatly limits its application in other fields. However, the applicant has found in a large number of experiments that when the mass ratio of polylactic acid and nano-titanium dioxide is limited to (0.1-0.2):1 and the mass fraction of polylactic acid is 10-20%, the biodegradation rate of the fiber in an anaerobic environment is ≥80% within 180 days. It is speculated that: on the one hand, the titanium dioxide presents a core-shell structure in the PLA matrix, which reduces the agglomeration phenomenon between the particles, thereby improving the photocatalytic effect of titanium dioxide; on the other hand, When degradation occurs, more voids and cracks can be formed inside the fiber, and microorganisms and water can enter the interior of the fiber, thereby increasing the degradation rate of the fiber in an anaerobic environment; when the applicant limits the volume ratio of the blended solution to ethanol to 1: (2-4), while ensuring its degradation performance, it also unexpectedly improves the breaking strength and elongation of the fiber. This may be because ethanol is adsorbed between PLA, making PLA have certain hydrophilic properties, promoting the compatibility of polylactic acid and nano-titanium dioxide, and enhancing the storage modulus of the composite material.

[0044] The applicant found that when the mass ratio of titanium dioxide-containing polylactic acid nanospheres and ultra-high molecular weight polyethylene swelling liquid is (0.02-0.07):1, the fiber's breaking strength is as high as 30 cN / dtex, and the elongation at break is ≤3.5%. It is speculated that the ultra-high molecular weight polyethylene swelling liquid forms more entanglement points in the blend, increases the modulus of the material, and thus affects its breaking strength and elongation at break. The weight-average molecular weight of polylactic acid is further limited to 50,000-150,000, and the molecular weight of the high molecular weight polymer is 1.4-1.6 million. The degree of mutual entanglement between macromolecules increases, causing the friction between molecules to increase, thereby affecting the elongation at break. On this basis, the applicant limited the melt index of polylactic acid to 20-30g / 10min (210℃, 2.16kg) and the melt index of ultra-high molecular weight polyethylene to 1-3g / 10min (190℃, 10kg). It was unexpectedly discovered that the fiber density can be made ≤1.0g / cm3. It is speculated that the polylactic acid and ultra-high molecular weight polyethylene at this molecular weight and melt index have better flow properties, improved processing performance, and a certain improvement in the relative molecular mass and crystallinity of the system, which in turn affects the fiber density of the fiber.

[0045] Beneficial effects: The degradable ultra-high molecular weight polyethylene fiber prepared by the preparation method of the present invention has excellent elongation at break and breaking strength, and also has a lower fiber density, and can be better used in marine fishing nets. At the same time, its excellent degradability can avoid environmental pollution, and it is a green and environmentally friendly fiber. In addition, the preparation method of the present invention has low manufacturing cost, simple production process, and is easy to realize industrial production. Example

[0046] Example 1

[0047] A method for preparing degradable ultra-high molecular weight polyethylene fiber, comprising the following steps:

[0048] S1: A polyester polymer is mixed with a good solvent to obtain a polyester polymer solution, which is then mixed with inorganic nanoparticles and stirred at a stirring speed of 1500 rpm / min for 4 hours to obtain a blended solution. The blended solution is then mixed with a non-good solvent and precipitated for 23 hours, filtered, and dried in a vacuum drying oven for 5 hours to obtain nanospheres;

[0049] S2: After mixing the high molecular weight polymer and the organic solvent in a weight ratio of 9:1, stirring at a stirring speed of 600 rpm / min for 13 minutes, a high molecular weight polymer molten liquid is obtained;

[0050] S3: adding the nanospheres to a high molecular weight polymer swellable solution, and then adding an organic solvent and performing thermal melting at a temperature of 140°C for 4 hours to obtain a spinning solution with a mass fraction of 8%;

[0051] S4: Using the gel spinning process, the spinning solution is added to the spinning device, the spinning temperature is set to 220°C, the spinning speed is 800m / min, and then the temperature is lowered to 15°C for cooling and solidification to obtain a spindle. The spindle is extracted in an extraction solvent with a weight ratio of 3:1:1 for 15 minutes. After that, the extracted spindle is stretched 6 times at 70°C and then stretched 10 times at 110°C.

[0052] The good solvent is chloroform.

[0053] The non-good solvent is ethanol.

[0054] The organic solvent is decalin.

[0055] The mass fraction of the polyester polymer solution is 15%.

[0056] The polyester polymer is polylactic acid, with a weight average molecular weight of 100,000 and a melt index of 22 g / 10 min (210° C., 2.16 kg), purchased from Natureworks, USA, model number 6202D.

[0057] The inorganic nanoparticles are titanium dioxide with an average particle size of 60 nm, purchased from Dongguan Long Innovation Materials Technology Co., Ltd., model number CQ-907.

[0058] The mass ratio of the polyester polymer to the inorganic nanoparticles in step S1 is 0.15:1.

[0059] In step S1, the volume ratio of the mixed solution and the non-good solvent is 1:3.

[0060] The polymer is ultra-high molecular weight polyethylene with a molecular weight of 1.5 million and a melt index of 2 g / 10 min (190° C., 10 kg), purchased from Mitsui Chemicals of Japan, model L5000.

[0061] The mass ratio between the nano-microspheres and the high molecular weight polymer molten liquid is 0.05:1.

[0062] A second aspect of the present invention provides an application of a method for preparing degradable high molecular weight polyethylene fibers in fishing nets.

[0063] Example 2

[0064] A method for preparing degradable ultra-high molecular weight polyethylene fiber, comprising the following steps:

[0065] S1: A polyester polymer is mixed with a good solvent to obtain a polyester polymer solution, which is then mixed with inorganic nanoparticles and stirred at a stirring speed of 1500 rpm / min for 4 hours to obtain a blended solution. The blended solution is then mixed with a non-good solvent and precipitated for 23 hours, filtered, and dried in a vacuum drying oven for 5 hours to obtain nanospheres;

[0066] S2: After mixing the high molecular weight polymer and the organic solvent in a weight ratio of 9:1, stirring at a stirring speed of 600 rpm / min for 13 minutes, a high molecular weight polymer molten liquid is obtained;

[0067] S3: adding the nanospheres to a high molecular weight polymer swellable solution, and then adding an organic solvent and performing thermal melting at a temperature of 140°C for 4 hours to obtain a spinning solution with a mass fraction of 8%;

[0068] S4: Using the gel spinning process, the spinning solution is added to the spinning device, the spinning temperature is set to 220°C, the spinning speed is 800m / min, and then the temperature is lowered to 15°C for cooling and solidification to obtain a spindle. The spindle is extracted in an extraction solvent of n-hexane, ethylene glycol and isopropanol with a weight ratio of 3:1:1. The extraction time is 15 minutes. After that, the extracted spindle is stretched 6 times at 70°C and then stretched 10 times at 110°C.

[0069] The good solvent is chloroform.

[0070] The non-good solvent is ethanol.

[0071] The organic solvent is decalin.

[0072] The mass fraction of the polyester polymer solution is 10%.

[0073] The polyester polymer is polylactic acid, with a weight average molecular weight of 100,000 and a melt index of 22 g / 10 min (210° C., 2.16 kg), purchased from Natureworks, USA, model number 6202D.

[0074] The inorganic nanoparticles are titanium dioxide with an average particle size of 60 nm, purchased from Dongguan Long Innovation Materials Technology Co., Ltd., model number CQ-907.

[0075] The mass ratio of the polyester polymer to the inorganic nanoparticles in step S1 is 0.2:1.

[0076] In step S1, the volume ratio of the mixed solution and the non-good solvent is 1:3.

[0077] The polymer is ultra-high molecular weight polyethylene with a molecular weight of 1.5 million and a melt index of 2 g / 10 min (190° C., 10 kg), purchased from Mitsui Chemicals of Japan, model L5000.

[0078] The mass ratio between the nano-microspheres and the high molecular weight polymer molten liquid is 0.05:1.

[0079] A second aspect of the present invention provides an application of a method for preparing degradable high molecular weight polyethylene fibers in fishing nets.

[0080] Example 3

[0081] A method for preparing degradable ultra-high molecular weight polyethylene fiber, comprising the following steps:

[0082] S1: A polyester polymer is mixed with a good solvent to obtain a polyester polymer solution, which is then mixed with inorganic nanoparticles and stirred at a stirring speed of 1500 rpm / min for 4 hours to obtain a blended solution. The blended solution is then mixed with a non-good solvent and precipitated for 23 hours, filtered, and dried in a vacuum drying oven for 5 hours to obtain nanospheres;

[0083] S2: After mixing the high molecular weight polymer and the organic solvent in a weight ratio of 9:1, stirring at a stirring speed of 600 rpm / min for 13 minutes, a high molecular weight polymer molten liquid is obtained;

[0084] S3: adding the nanospheres to a high molecular weight polymer swellable solution, and then adding an organic solvent and performing thermal melting at a temperature of 140°C for 4 hours to obtain a spinning solution with a mass fraction of 8%;

[0085] S4: Using the gel spinning process, the spinning solution is added to the spinning device, the spinning temperature is set to 220°C, the spinning speed is 800m / min, and then the temperature is lowered to 15°C for cooling and solidification to obtain a spindle. The spindle is extracted in an extraction solvent with a weight ratio of 3:1:1 for 15 minutes. After that, the extracted spindle is stretched 6 times at 70°C and then stretched 10 times at 110°C.

[0086] The good solvent is chloroform.

[0087] The non-good solvent is ethanol.

[0088] The organic solvent is decalin.

[0089] The mass fraction of the polyester polymer solution is 15%.

[0090] The polyester polymer is polylactic acid, with a weight average molecular weight of 100,000 and a melt index of 22 g / 10 min (210° C., 2.16 kg), purchased from Natureworks, USA, model number 6202D.

[0091] The inorganic nanoparticles are titanium dioxide with an average particle size of 60 nm, purchased from Dongguan Long Innovation Materials Technology Co., Ltd., model number CQ-907.

[0092] The mass ratio of the polyester polymer to the inorganic nanoparticles in step S1 is 0.1:1.

[0093] In step S1, the volume ratio of the mixed solution and the non-good solvent is 1:4.

[0094] The polymer is ultra-high molecular weight polyethylene with a molecular weight of 1.5 million and a melt index of 2 g / 10 min (190° C., 10 kg), purchased from Mitsui Chemicals of Japan, model L5000.

[0095] The mass ratio between the nano-microspheres and the high molecular weight polymer molten liquid is 0.05:1.

[0096] A second aspect of the present invention provides an application of a method for preparing degradable high molecular weight polyethylene fibers in fishing nets.

[0097] Example 4

[0098] A method for preparing degradable ultra-high molecular weight polyethylene fiber, comprising the following steps:

[0099] S1: A polyester polymer is mixed with a good solvent to obtain a polyester polymer solution, which is then mixed with inorganic nanoparticles and stirred at a stirring speed of 1500 rpm / min for 4 hours to obtain a blended solution. The blended solution is then mixed with a non-good solvent and precipitated for 23 hours, filtered, and dried in a vacuum drying oven for 5 hours to obtain nanospheres;

[0100] S2: After mixing the high molecular weight polymer and the organic solvent in a weight ratio of 9:1, stirring at a stirring speed of 600 rpm / min for 13 minutes, a high molecular weight polymer molten liquid is obtained;

[0101] S3: adding the nanospheres to a high molecular weight polymer swellable solution, and then adding an organic solvent and performing thermal melting at a temperature of 140°C for 4 hours to obtain a spinning solution with a mass fraction of 8%;

[0102] S4: Using the gel spinning process, the spinning solution is added to the spinning device, the spinning temperature is set to 220°C, the spinning speed is 800m / min, and then the temperature is lowered to 15°C for cooling and solidification to obtain a spindle. The spindle is extracted in an extraction solvent with a weight ratio of 3:1:1 for 15 minutes. After that, the extracted spindle is stretched 6 times at 70°C and then stretched 10 times at 110°C.

[0103] The good solvent is chloroform.

[0104] The non-good solvent is ethanol.

[0105] The organic solvent is decalin.

[0106] The mass fraction of the polyester polymer solution is 20%.

[0107] The polyester polymer is polylactic acid, with a weight average molecular weight of 100,000 and a melt index of 22 g / 10 min (210° C., 2.16 kg), purchased from Natureworks, USA, model number 6202D.

[0108] The inorganic nanoparticles are titanium dioxide with an average particle size of 60 nm, purchased from Dongguan Long Innovation Materials Technology Co., Ltd., model number CQ-907.

[0109] The mass ratio of the polyester polymer to the inorganic nanoparticles in step S1 is 0.15:1.

[0110] In step S1, the volume ratio of the mixed solution and the non-good solvent is 1:3.

[0111] The polymer is ultra-high molecular weight polyethylene with a molecular weight of 1.5 million and a melt index of 2 g / 10 min (190° C., 10 kg), purchased from Mitsui Chemicals of Japan, model L5000.

[0112] The mass ratio between the nano-microspheres and the high molecular weight polymer molten liquid is 0.02:1.

[0113] A second aspect of the present invention provides an application of a method for preparing degradable high molecular weight polyethylene fibers in fishing nets.

[0114] Comparative Example 1

[0115] The melt index of the polylactic acid was changed to 10 g / 10 min (210° C., 2.16 kg), and the weight average molecular weight was changed to 200,000. The polylactic acid was purchased from Natureworks, USA, model 6060D. The rest was the same as in Example 1.

[0116] Comparative Example 2

[0117] The mass ratio of polylactic acid to titanium dioxide was changed to 0.02:1, the mass fraction of polylactic acid was changed to 30%, and the rest was the same as in step 1.

[0118] Comparative Example 3

[0119] The mass ratio between the nanospheres and the high molecular weight polymer molten liquid was changed to 0.2:1, and the volume ratio between the blended solution and ethanol was changed to 1:6. The rest was the same as in Example 1.

[0120] Comparative Example 4

[0121] The mass ratio of polylactic acid to titanium dioxide was changed to 0.3:1, and the mass ratio of nanospheres to high molecular weight polymer molten liquid was changed to 0.008:1. The rest was the same as in Example 1.

[0122] Performance evaluation

[0123] (1) Determination of breaking strength and breaking elongation: Determination is carried out according to the test standard SC / T5005-2014. (2) Determination of fiber density: Determination of carbon fiber density according to the test standard GB / T 30019-2013

[0124] To determine its fiber density.

[0125] (3) Degradation performance: The biodegradation rate was determined according to the test standard GB / T 32106-2015 (biodegradation rate after 180 days under anaerobic conditions).

[0126] Table 1

[0127]

Claims

1. A method for preparing degradable ultra-high molecular weight polyethylene fiber, characterized in that: Here are the steps: S1: mixing a polyester polymer with a good solvent to obtain a polyester polymer solution, then mixing the polyester polymer solution with inorganic nanoparticles to obtain a blended solution, and then mixing the blended solution with a non-good solvent to obtain nanospheres; the polyester polymer has a weight average molecular weight of 50,000 to 200,000 and a melt index of 15 to 30 g / 10 min at 210° C. and a load of 2.16 kg; the polyester polymer is polylactic acid, and the mass fraction of the polylactic acid in the polylactic acid solution is 10 to 20%; S2: mixing ultra-high molecular weight polyethylene and an organic solvent to obtain an ultra-high molecular weight polyethylene molten liquid; S3: thermally melting the nanospheres and the ultra-high molecular weight polyethylene molten liquid to obtain a spinning solution; S4: Cooling, solidifying, extracting, and stretching the spinning solution to obtain biodegradable ultra-high molecular weight polyethylene fibers; The inorganic nanoparticles are nano-titanium dioxide; the mass ratio of the polylactic acid and nano-titanium dioxide is (0.1-0.2):1; the molecular weight of the ultra-high molecular weight polyethylene is 1.3-1.6 million, and the melt index is 1-5g / 10min; the mass ratio of the nano-microspheres and the ultra-high molecular weight polyethylene molten liquid is (0.02-0.07):

1.

2. The method for preparing the degradable ultra-high molecular weight polyethylene fiber according to claim 1, wherein: In step S1, the volume ratio between the mixed solution and the non-good solvent is 1:(1-5).

3. The method for preparing the degradable ultra-high molecular weight polyethylene fiber according to claim 1, wherein: The average particle size of the inorganic nanoparticles is 50-100 nm.

4. The method for preparing the degradable ultra-high molecular weight polyethylene fiber according to claim 1, wherein: The specific steps of stretching in step S4 are: stretching the extracted spun yarn by 4-8 times at a temperature of 50-90° C., and then stretching it by 8-12 times at a temperature of 100-120° C.

5. Use of the preparation method of the degradable ultra-high molecular weight polyethylene fiber according to any one of claims 1 to 4 in the preparation of fishing nets.

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