Fishing net with high tensile strength and good weather resistance

Abstract

The invention relates to the technical field of fishing nets, and discloses a fishing net with high tensile strength and good weatherability, which is composed of the following components: high density polyethylene, maleic anhydride grafted polypropylene, aminated carbon nanotubes, calcium carbonate, tetrakis [beta-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester, bis (2, 2, 6, 6-tetramethyl-4-piperidyl)-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5- The preparation method comprises the following steps: adding 2, 2, 6, 6-tetramethylpiperidyl) sebacate, 2-hydroxy-4-n-octyloxybenzophenone and calcium stearate into a reaction kettle; through cooperation of multiple components and process optimization, the mechanical property and weather resistance of the fishing net are improved. The high-density polyethylene serves as a continuous phase matrix and provides basic mechanical support, and the high-molecular chain crystal structure of the high-density polyethylene endows the material with rigidity and wear resistance; maleic anhydride grafted polypropylene is introduced as a compatilizer, a maleic anhydride group on a molecular chain is wound with an HDPE molecular chain to form physical crosslinking, and meanwhile, the maleic anhydride group and amino on the surface of an aminated carbon nanotube form a chemical covalent bond through an esterification reaction, so that the interfacial compatibility is improved through dual effects.

Description

Technical Field

[0001] The invention relates to the technical field of fishing nets, in particular to a fishing net with high tensile strength and good weather resistance. Background Art

[0002] Fishing nets are a core tool for fishery production, and their performance directly determines fishing efficiency and operating costs. Fishing nets not only need to be strong enough to withstand the traction, impact, and buoyancy of seawater during the fishing process, but also need to withstand erosion from complex environments such as long-term seawater immersion, UV radiation, and salt spray corrosion. Traditional fishing nets are mostly made of ordinary high-density polyethylene (HDPE) or polypropylene (PP). Although they have a certain degree of flexibility, they suffer from two key issues: insufficient mechanical properties and poor weather resistance.

[0003] Traditional fishing net substrates have weak inter-chain interactions, resulting in low tensile strength and unstable elongation at break. These materials are prone to breakage or deformation when catching large fish or encountering seabed obstacles. Furthermore, uneven filler dispersion leads to poor interfacial bonding in the composite material, leading to delamination and embrittlement after long-term use.

[0004] Because the carbon-hydrogen structure in the polyethylene molecular chain is easily excited by ultraviolet rays to produce free radicals, which trigger oxidative degradation reactions, causing the material to turn yellow and become brittle, the tensile strength of traditional fishing nets is significantly reduced after one year of outdoor use, seriously shortening their service life.

[0005] In the prior art, although there have been attempts to improve strength by adding ordinary carbon nanotubes or calcium carbonate, due to poor interface compatibility and uneven dispersion, stress concentration points are easily formed, which in turn leads to a decrease in material toughness.

[0006] Therefore, it is very necessary to develop a fishing net that has high strength, high toughness, and resistance to light and oxygen aging, so as to extend the use time of the fishing net and reduce the cost of use. Summary of the Invention

[0007] In view of the problems in the prior art, the present invention provides a fishing net with high tensile strength and good weather resistance.

[0008] The technical solution adopted by the present invention to solve the technical problem is: a fishing net with high tensile strength and good weather resistance, composed of the following components in parts by mass: 72-80 parts of high-density polyethylene, 21-25 parts of maleic anhydride grafted polypropylene, 12-16 parts of amino carbon nanotubes, 18-24 parts of calcium carbonate, 0.8-1.4 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 1.5-2.2 parts of bis(2,2,6,6-tetramethylpiperidinyl)sebacate, 1.2-1.6 parts of 2-hydroxy-4-n-octyloxybenzophenone, and 0.8-1.8 parts of calcium stearate.

[0009] As a further technical solution, the grafting rate of the maleic anhydride grafted polypropylene is ≥6%, and the melt index is 3-5 g / 10 min.

[0010] As a further technical solution, the preparation method of the amino-modified carbon nanotubes includes:

[0011] The carbon nanotubes were placed in mixed acid and ultrasonically dispersed for 2-3 hours for carboxylation treatment;

[0012] The mixed acid is prepared by mixing 60% concentrated sulfuric acid and 15% concentrated nitric acid in a volume ratio of 3:1;

[0013] After washing with deionized water until neutral, add excess ethylenediamine and reflux at 100-114°C for 14-18 hours;

[0014] The reaction product was separated by centrifugation, washed with ethanol, and then dried in vacuum at 92-100° C. for 12 h to obtain amino-modified carbon nanotubes.

[0015] As a further technical solution, the diameter of the amino-modified carbon nanotubes is 20-30 nm and the length is 12-20 μm.

[0016] As a further technical solution, the high-density polyethylene and maleic anhydride grafted polypropylene are premixed in proportion, 0.22-0.25% dicumyl peroxide initiator is added, and the mixture is reacted and extruded in a twin-screw extruder to obtain a modified resin;

[0017] The temperature zones are: zone 1 170-180°C, zone 2 190-200°C, zone 3 200-210°C, zone 4 210-220°C, screw speed 150-200rpm, residence time 2-4min.

[0018] As a further technical solution, the modified resin is premixed with amino carbon nanotubes, calcium carbonate, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], bis(2,2,6,6-tetramethylpiperidinyl)sebacate, 2-hydroxy-4-n-octyloxybenzophenone, and calcium stearate by a high-speed mixer at a premixing speed of 1200-1500 rpm and a premixing time of 15-20 min to obtain a premixed material.

[0019] As a further technical solution, the premixed materials are melt-blended in a co-rotating twin-screw extruder at a melt-blending temperature of 200-220° C. and a screw aspect ratio of 40-45:1, and then water-cooled and pelletized to obtain masterbatch.

[0020] As a further technical solution, the fishing net is formed by a melt spinning-weaving process, wherein the masterbatch is melted at 230-240°C, the monofilaments are extruded through a spinneret, and then the monofilaments are woven into the fishing net.

[0021] As a further technical solution, the spinneret aperture is 0.25-0.32 mm, the spinning speed is 800-1100 m / min, and the draft ratio is 1:5-7.

[0022] Beneficial effects of the present invention:

[0023] The present invention significantly improves the mechanical properties and weather resistance of fishing nets through multi-component synergistic modification and process optimization.

[0024] First, the present invention uses high-density polyethylene as the continuous phase matrix to provide basic mechanical support, and its polymer chain crystalline structure gives the material rigidity and wear resistance; by introducing maleic anhydride grafted polypropylene as a compatibilizer, the maleic anhydride groups on its molecular chain are entangled with the HDPE molecular chain to form physical crosslinks, and at the same time form chemical covalent bonds with the amino groups on the surface of the amino-treated carbon nanotubes through esterification reaction. The dual effects improve the interface compatibility, so that the filler and the matrix form an "island structure", the stress transfer efficiency is increased by more than 40%, and the mechanical properties of the fishing net material are greatly improved.

[0025] By introducing amino-treated carbon nanotubes as nano-reinforced fillers, their one-dimensional structure forms a "physical cross-linked network". During the stretching process, energy is consumed through the "pull-out effect", which greatly improves the tensile strength. At the same time, the amino treatment increases the surface active sites and significantly improves the interfacial bonding energy with the material, avoiding performance degradation caused by filler agglomeration.

[0026] Calcium carbonate is used as a rigid filler and is evenly dispersed in the matrix. Through the "microcrack toughening" mechanism, it induces microcracks in the matrix to absorb energy when subjected to stress, maintaining a high elongation at break.

[0027] Antioxidant 1010 (pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate): As a hindered phenol antioxidant, it captures alkyl radicals (R·) and peroxy radicals (ROO·) generated by material degradation, terminating the oxidation chain reaction and extending the oxidation induction time (OIT) from 25 minutes in the traditional process to 68 minutes. Light stabilizer 770 (bis(2,2,6,6-tetramethylpiperidinyl) sebacate): Through a "free radical capture mechanism," it converts active free radicals generated by UV excitation into stable compounds, while inhibiting polymer chain breakage, thereby increasing the tensile strength retention after aging to over 90%. UV absorber UV-531 (2-hydroxy-4-n-octyloxybenzophenone): Selectively absorbs 290-400nm ultraviolet rays and forms a "photostable chelate ring" through intramolecular hydrogen bonds, converting light energy into heat energy release. Its UV absorption rate reaches 92%, preventing the substrate molecular chains from directly absorbing high-energy rays and causing breakage.

[0028] The high specific surface area of amino-modified carbon nanotubes can physically absorb some ultraviolet rays, while their conjugated π electron structure quenches excited molecules and reduces the probability of initiation of photooxidation reactions; the filling of calcium carbonate makes the material density uniform, reduces the seawater penetration rate, and delays the corrosion of salt ions on the matrix. DETAILED DESCRIPTION

[0029] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0030] The invention provides a fishing net with high tensile strength and good weather resistance, characterized in that the fishing net is composed of the following components, calculated in parts by mass: 72-80 parts of high-density polyethylene, 21-25 parts of maleic anhydride grafted polypropylene, 12-16 parts of amino carbon nanotubes, 18-24 parts of calcium carbonate, 0.8-1.4 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 1.5-2.2 parts of bis(2,2,6,6-tetramethylpiperidinyl)sebacate, 1.2-1.6 parts of 2-hydroxy-4-n-octyloxybenzophenone, and 0.8-1.8 parts of calcium stearate.

[0031] The maleic anhydride grafted polypropylene has a grafting rate of ≥6% and a melt index of 3-5 g / 10 min. It is purchased from Shanghai Jinshan Petrochemical Company and has a brand name of MAPP-101.

[0032] The preparation method of the amino-modified carbon nanotubes includes: placing carbon nanotubes (purchased from Shenzhen Nanoport Co., Ltd., model CNT-001) in mixed acid and ultrasonically dispersing them for 2-3 hours to perform carboxylation treatment; the mixed acid is prepared by mixing 60% concentrated sulfuric acid and 15% concentrated nitric acid in a volume ratio of 3:1; washing with deionized water until neutral, adding excess ethylenediamine, and refluxing at 100-114°C for 14-18 hours; after centrifuging the reaction product, washing with ethanol, and vacuum drying at 92-100°C for 12 hours to obtain the amino-modified carbon nanotubes, which have a tube diameter of 20-30 nm and a length of 12-20 μm.

[0033] The high-density polyethylene and maleic anhydride-grafted polypropylene were premixed in proportion, and 0.22-0.25% dicumyl peroxide initiator (purchased from Jiangsu Qiangsheng Functional Chemical Co., Ltd.) was added. The mixture was reacted and extruded in a twin-screw extruder (model SHJ-35, Nanjing Ruiya Extrusion Machinery Co., Ltd.) to obtain a modified resin. The temperature zones were: zone 1 170-180°C, zone 2 190-200°C, zone 3 200-210°C, zone 4 210-220°C, the screw speed was 150-200 rpm, and the residence time was 2-4 minutes.

[0034] The modified resin is premixed with amino carbon nanotubes, calcium carbonate, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], bis(2,2,6,6-tetramethylpiperidinyl)sebacate, 2-hydroxy-4-n-octyloxybenzophenone, and calcium stearate in a high-speed mixer (model SHR-10A, Zhangjiagang Huaming Machinery Co., Ltd.) at a premixing speed of 1200-1500 rpm and a premixing time of 15-20 minutes to obtain a premixed material.

[0035] The premixed materials were melt-blended in a co-rotating twin-screw extruder (model TE-35, Nanjing Jieente Electromechanical Co., Ltd.) at a melt-blending temperature of 200-220° C. and a screw aspect ratio of 40-45:1, and then water-cooled and pelletized to obtain masterbatch.

[0036] The fishnet is formed through a melt spinning-weaving process. The masterbatch is melted at 230-240°C and extruded into single filaments through a spinneret (aperture size of 0.25-0.32 mm) at a spinning speed of 800-1100 m / min and a draft ratio of 1:5-7. The fishnet is then woven using a fishing net weaving machine (model 3FZ-1500, Zhejiang Hailun Rope Net Machinery Co., Ltd.).

[0037] The following are specific embodiments:

[0038] Example 1

[0039] (1) 72 parts of high-density polyethylene (HDPE5000S, Daqing Petrochemical Company of PetroChina) and 21 parts of maleic anhydride-grafted polypropylene were premixed, 0.22% of dicumyl peroxide initiator was added, and the mixture was subjected to reaction extrusion in a twin-screw extruder. The temperature zones were 170°C for zone 1, 190°C for zone 2, 200°C for zone 3, and 210°C for zone 4. The screw speed was 150 rpm and the residence time was 4 min to obtain a modified resin.

[0040] (2) The modified resin obtained in step (1) was added to a high-speed mixer with 12 parts of amino-treated carbon nanotubes, 18 parts of calcium carbonate (particle size 800 mesh, Henan Nanzhao Calcium Carbonate Factory), 0.8 parts of antioxidant 1010, 1.5 parts of light stabilizer 770, 1.2 parts of ultraviolet absorber UV-531, and 0.8 parts of calcium stearate, and premixed at a speed of 1200 rpm for 20 min to obtain a premixed material.

[0041] (3) The premixed materials were melt blended in a co-rotating twin-screw extruder at a temperature of 200°C and a screw length-diameter ratio of 40:1, and then water-cooled and pelletized to obtain masterbatch.

[0042] (4) The masterbatch was melted at 230°C and extruded into monofilaments through a spinneret with an aperture of 0.25 mm at a spinning speed of 800 m / min and a draft ratio of 1:5, and the monofilaments were woven into a fishing net.

[0043] Maleic anhydride grafted polypropylene had a grafting rate of 6.5% and a melt index of 3 g / 10 min and was purchased from Shanghai Jinshan Petrochemical Company with the brand name MAPP-101.

[0044] The preparation method of amino-modified carbon nanotubes includes: placing carbon nanotubes (purchased from Shenzhen Nanoport Co., Ltd., model CNT-001) in mixed acid and ultrasonically dispersing them for 2 hours for carboxylation treatment; the mixed acid is prepared by mixing 60% concentrated sulfuric acid and 15% concentrated nitric acid in a volume ratio of 3:1; after washing with deionized water until neutral, adding excess ethylenediamine, and refluxing at 100°C for 14 hours; after centrifuging the reaction product, washing with ethanol, and vacuum drying at 92°C for 12 hours to obtain amino-modified carbon nanotubes with a tube diameter of 20 nm and a length of 12 μm.

[0045] Example 2

[0046] (1) 75 parts of high-density polyethylene and 23 parts of maleic anhydride grafted polypropylene were premixed, 0.23% of dicumyl peroxide initiator was added, and the mixture was reacted and extruded in a twin-screw extruder with the temperature zones of zone 1: 175°C, zone 2: 195°C, zone 3: 205°C, and zone 4: 215°C. The screw speed was 170 rpm, and the residence time was 3 min to obtain a modified resin.

[0047] (2) The modified resin was premixed with 14 parts of amino-modified carbon nanotubes, 21 parts of calcium carbonate, 1.1 parts of antioxidant 1010, 1.8 parts of light stabilizer 770, 1.4 parts of ultraviolet absorber UV-531, and 1.3 parts of calcium stearate in a high-speed mixer at 1300 rpm for 18 minutes to obtain a premixed material.

[0048] (3) The premixed materials were melt blended in a co-rotating twin-screw extruder at a temperature of 210°C and a screw length-diameter ratio of 42:1, and then water-cooled and pelletized to obtain masterbatch.

[0049] (4) The masterbatch was melted at 235 °C and extruded through a spinneret with a pore size of 0.28 mm at a spinning speed of 950 m / min and a draft ratio of 1:6, and woven into a fishing net.

[0050] Maleic anhydride grafted polypropylene had a grafting rate of 6.8% and a melt index of 3.5 g / 10 min and was purchased from Shanghai Jinshan Petrochemical Company with the brand name MAPP-101.

[0051] The preparation method of the amino-modified carbon nanotubes includes: placing carbon nanotubes (purchased from Shenzhen Nanoport Co., Ltd., model CNT-001) in mixed acid and ultrasonically dispersing them for 2.5 hours to perform carboxylation treatment; the mixed acid is prepared by mixing 60% concentrated sulfuric acid and 15% concentrated nitric acid in a volume ratio of 3:1; washing with deionized water until neutral, adding excess ethylenediamine, and refluxing at 112°C for 15 hours; after centrifuging the reaction product, washing with ethanol, and vacuum drying at 94°C for 12 hours to obtain amino-modified carbon nanotubes with a tube diameter of 25 nm and a length of 15 μm.

[0052] Example 3

[0053] (1) 78 parts of high-density polyethylene and 24 parts of maleic anhydride grafted polypropylene were premixed, 0.24% of dicumyl peroxide initiator was added, and the mixture was reacted and extruded in a twin-screw extruder. The temperature zones were 180°C for zone 1, 200°C for zone 2, 210°C for zone 3, and 220°C for zone 4. The screw speed was 200 rpm and the residence time was 2 min to obtain a modified resin.

[0054] (2) The modified resin was premixed with 15 parts of amino-modified carbon nanotubes, 22 parts of calcium carbonate, 1.3 parts of antioxidant 1010, 2.0 parts of light stabilizer 770, 1.5 parts of ultraviolet absorber UV-531, and 1.6 parts of calcium stearate in a high-speed mixer at 1500 rpm for 15 minutes to obtain a premixed material.

[0055] (3) The premixed materials were melt blended in a co-rotating twin-screw extruder at a temperature of 220°C and a screw length-diameter ratio of 45:1, and then water-cooled and pelletized to obtain masterbatch.

[0056] (4) The masterbatch was melted at 240 °C and extruded into monofilaments through a spinneret with an aperture of 0.32 mm at a spinning speed of 1100 m / min and a draft ratio of 1:7, and woven into a fishing net.

[0057] Maleic anhydride grafted polypropylene had a grafting rate of 7.2% and a melt index of 4 g / 10 min and was purchased from Shanghai Jinshan Petrochemical Company with the brand name MAPP-101.

[0058] The preparation method of amino-modified carbon nanotubes includes: placing carbon nanotubes (purchased from Shenzhen Nanoport Co., Ltd., model CNT-001) in mixed acid and ultrasonically dispersing them for 3 hours for carboxylation treatment; the mixed acid is prepared by mixing 60% concentrated sulfuric acid and 15% concentrated nitric acid in a volume ratio of 3:1; after washing with deionized water until neutral, adding excess ethylenediamine, and refluxing at 108°C for 16 hours; after centrifuging the reaction product, washing with ethanol, and vacuum drying at 95°C for 12 hours to obtain amino-modified carbon nanotubes with a tube diameter of 25nm and a length of 16μm.

[0059] Example 4

[0060] (1) 80 parts of high-density polyethylene and 25 parts of maleic anhydride-grafted polypropylene were premixed, 0.25% of dicumyl peroxide initiator was added, and the mixture was extruded in a twin-screw extruder with the same temperature zones as in Example 3, a screw speed of 180 rpm, and a residence time of 3 min to obtain a modified resin.

[0061] (2) The modified resin was premixed with 16 parts of amino-modified carbon nanotubes, 24 parts of calcium carbonate, 1.4 parts of antioxidant 1010, 2.2 parts of light stabilizer 770, 1.6 parts of ultraviolet absorber UV-531, and 1.8 parts of calcium stearate in a high-speed mixer with the same parameters as in Example 3 to obtain a premixed material.

[0062] (3) The premixed materials were melt-blended in a co-rotating twin-screw extruder with the same parameters as in Example 3, and then water-cooled and pelletized to obtain masterbatch.

[0063] (4) The masterbatch melt spinning and weaving parameters are the same as those in Example 3 to obtain a fishing net.

[0064] Maleic anhydride grafted polypropylene had a grafting rate of 7.8% and a melt index of 4.3 g / 10 min and was purchased from Shanghai Jinshan Petrochemical Company with the brand name MAPP-101.

[0065] The preparation method of amino-modified carbon nanotubes includes: placing carbon nanotubes (purchased from Shenzhen Nanoport Co., Ltd., model CNT-001) in mixed acid and ultrasonically dispersing them for 2.5 hours for carboxylation treatment; the mixed acid is prepared by mixing 60% concentrated sulfuric acid and 15% concentrated nitric acid in a volume ratio of 3:1; after washing with deionized water until neutral, adding excess ethylenediamine, and refluxing at 106°C for 14-18 hours; after centrifuging the reaction product, washing with ethanol, and vacuum drying at 98°C for 12 hours to obtain amino-modified carbon nanotubes with a tube diameter of 24nm and a length of 16μm.

[0066] Example 5

[0067] (1) 76 parts of high-density polyethylene and 22 parts of maleic anhydride-grafted polypropylene were premixed, 0.23% of dicumyl peroxide initiator was added, and the mixture was extruded in a twin-screw extruder with the same temperature zones as in Example 2, a screw speed of 160 rpm, and a residence time of 3.5 min to obtain a modified resin.

[0068] (2) The modified resin was premixed with 13 parts of amino-modified carbon nanotubes, 20 parts of calcium carbonate, 1.0 part of antioxidant 1010, 1.6 parts of light stabilizer 770, 1.3 parts of ultraviolet absorber UV-531, and 1.0 part of calcium stearate in a high-speed mixer with the same parameters as in Example 2 to obtain a premixed material.

[0069] (3) The premixed materials were melt-blended in a co-rotating twin-screw extruder with the same parameters as in Example 2, and then water-cooled and pelletized to obtain masterbatch.

[0070] (4) The masterbatch melt spinning and weaving parameters are the same as those in Example 2 to obtain a fishing net.

[0071] Maleic anhydride grafted polypropylene had a grafting rate of 6.9% and a melt index of 5 g / 10 min and was purchased from Shanghai Jinshan Petrochemical Company with the brand name MAPP-101.

[0072] The preparation method of amino-modified carbon nanotubes includes: placing carbon nanotubes (purchased from Shenzhen Nanoport Co., Ltd., model CNT-001) in mixed acid and ultrasonically dispersing them for 3 hours for carboxylation treatment; the mixed acid is prepared by mixing 60% concentrated sulfuric acid and 15% concentrated nitric acid in a volume ratio of 3:1; after washing with deionized water until neutral, adding excess ethylenediamine, and refluxing at 114°C for 18 hours; after centrifuging the reaction product, washing with ethanol, and vacuum drying at 100°C for 12 hours to obtain amino-modified carbon nanotubes with a tube diameter of 30 nm and a length of 20 μm.

[0073] Comparative Example 1

[0074] (1) The difference from Example 1 is that the formula does not contain amino-treated carbon nanotubes, and the other ingredients and process steps are the same as those in Example 1.

[0075] (2) Specifically, 72 parts of high-density polyethylene, 21 parts of maleic anhydride grafted polypropylene, 18 parts of calcium carbonate, 0.8 parts of antioxidant 1010, 1.5 parts of light stabilizer 770, 1.2 parts of ultraviolet absorber UV-531, and 0.8 parts of calcium stearate were used to prepare a fishing net according to the process of Example 1.

[0076] Comparative Example 2

[0077] (1) The difference from Example 1 is that the formula does not contain calcium carbonate and untreated carbon nanotubes are used. The other ingredients and process steps are the same as those in Example 1.

[0078] (2) Specifically, 72 parts of high-density polyethylene, 21 parts of maleic anhydride grafted polypropylene, 12 parts of carbon nanotubes, 0.8 parts of antioxidant 1010, 1.5 parts of light stabilizer 770, 1.2 parts of ultraviolet absorber UV-531, and 0.8 parts of calcium stearate were used to prepare a fishing net according to the process of Example 1.

[0079] test:

[0080] Tensile properties test

[0081] Test method: Refer to GB / T1040.2-2006 "Determination of tensile properties of plastics Part 2: Test conditions for molded and extruded plastics", use an electronic universal testing machine (model CMT4104, Shenzhen Xinsansi Material Testing Co., Ltd.), the specimen is dumbbell-shaped, the tensile speed is 50 mm / min, the test temperature is 23℃±2℃, and the relative humidity is 50%±5%.

[0082] Test results:

[0083] Table 1

[0084]

[0085]

[0086] It can be seen from Table 1 that the fishing net prepared by the present invention has excellent tensile properties.

[0087] Weather resistance test

[0088] Test method: Refer to GB / T16422.2-2014 "Plastics laboratory light source exposure test method Part 2: Xenon arc lamp", use xenon lamp weathering test chamber (model Xenotest Alpha +, ATLAS, Germany), test conditions: irradiance 0.55W / m 2 (340nm), blackboard temperature 65℃±3℃, relative humidity 50%±5%, continuous irradiation 1000h, test the tensile strength retention rate before and after aging.

[0089] Test results:

[0090] Table 2

[0091]

[0092] As can be seen from Table 2, the fishing net provided by the present invention significantly improves weather resistance by adding amino-treated carbon nanotubes and calcium carbonate, and combining antioxidants, light stabilizers and ultraviolet absorbers.

[0093] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A fishing net with high tensile strength and good weather resistance, characterized in that: The invention is composed of the following components in parts by mass: 72-80 parts of high-density polyethylene, 21-25 parts of maleic anhydride grafted polypropylene, 12-16 parts of amino carbon nanotubes, 18-24 parts of calcium carbonate, 0.8-1.4 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 1.5-2.2 parts of bis(2,2,6,6-tetramethylpiperidinyl) sebacate, 1.2-1.6 parts of 2-hydroxy-4-n-octyloxybenzophenone, and 0.8-1.8 parts of calcium stearate.

2. A fishing net with high tensile strength and good weather resistance according to claim 1, characterized in that: The grafting rate of the maleic anhydride grafted polypropylene is ≥6%, and the melt index is 3-5g / 10min.

3. A fishing net with high tensile strength and good weather resistance according to claim 1, characterized in that: The preparation method of the amino-modified carbon nanotubes comprises: The carbon nanotubes were placed in mixed acid and ultrasonically dispersed for 2-3 hours for carboxylation treatment; The mixed acid is prepared by mixing 60% concentrated sulfuric acid and 15% concentrated nitric acid in a volume ratio of 3:1; After washing with deionized water until neutral, add excess ethylenediamine and reflux at 100-114°C for 14-18 hours; The reaction product was separated by centrifugation, washed with ethanol, and then dried in vacuum at 92-100° C. for 12 h to obtain amino-modified carbon nanotubes.

4. A fishing net with high tensile strength and good weather resistance according to claim 3, characterized in that: The diameter of the amino-modified carbon nanotubes is 20-30 nm, and the length is 12-20 μm.

5. The fishing net with high tensile strength and good weather resistance according to claim 1, characterized in that: The high-density polyethylene and maleic anhydride grafted polypropylene are premixed in proportion, 0.22-0.25% dicumyl peroxide initiator is added, and the mixture is reacted and extruded in a twin-screw extruder to obtain a modified resin; The temperature zones are: zone 1 170-180°C, zone 2 190-200°C, zone 3 200-210°C, zone 4 210-220°C, screw speed 150-200rpm, residence time 2-4min.

6. A fishing net with high tensile strength and good weather resistance according to claim 5, characterized in that: The modified resin is premixed with amino carbon nanotubes, calcium carbonate, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], bis(2,2,6,6-tetramethylpiperidinyl)sebacate, 2-hydroxy-4-n-octyloxybenzophenone, and calcium stearate in a high-speed mixer at a premixing speed of 1200-1500 rpm and a premixing time of 15-20 minutes to obtain a premixed material.

7. A fishing net with high tensile strength and good weather resistance according to claim 6, characterized in that: The premixed materials are melt-blended in a co-rotating twin-screw extruder at a temperature of 200-220° C. and a screw length-diameter ratio of 40-45:1, and then water-cooled and pelletized to obtain masterbatch.

8. A fishing net with high tensile strength and good weather resistance according to claim 7, characterized in that: The fishing net is formed through a melt spinning-weaving process, wherein the masterbatch is melted at 230-240°C, the monofilament is extruded through a spinneret, and then the fishing net is woven.

9. A fishing net with high tensile strength and good weather resistance according to claim 8, characterized in that: The spinneret aperture is 0.25-0.32 mm, the spinning speed is 800-1100 m / min, and the draft ratio is 1:5-7.

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