High-toughness, bend-resistant aoc connector and method of making

Abstract

The application relates to the technical field of AOC connector, and discloses a high-toughness bending-resistant AOC connector and a preparation method.The AOC connector comprises an optical cable assembly and an AOC connector head; the optical cable assembly comprises an optical fiber, an aramid yarn layer, a polyethylene outer protective layer and a braided layer; polyethylene, 4-hydroxystyrene grafted polyethylene, 1,3,5-tri(4-benzoxazinylphenyl)benzene and the like are mixed, extruded, granulated and heat-treated to obtain the polyethylene outer protective layer; the 1,3,5-tri(4-benzoxazinylphenyl)benzene contains multiple oxazine ring crosslinking polymerization sites, and crosslinking reaction occurs with the phenolic hydroxyl structure of the grafted polyethylene, the crosslinking degree of the molecular chains in the polyethylene is increased, the polyethylene molecular chains are not prone to relative slipping under external force, the ability to resist external force deformation is increased, the polyethylene outer protective layer has good strength and high-toughness bending resistance, and the bending resistance and protection performance of the AOC connector optical cable are improved.

Description

Technical Field

[0001] This invention relates to the field of AOC connector technology, specifically to a high-toughness, bending-resistant AOC connector and its manufacturing method. Background Technology

[0002] AOC active optical fiber connectors are connectors based on optical fiber transmission technology, widely used in equipment requiring high-speed data transmission, such as industrial printing presses, medical devices, measuring instruments, industrial robots, and factory automation. AOC connectors mainly consist of a connector head and an optical fiber cable. The outer sheath of the optical fiber cable primarily protects the optical fiber. The outer sheath is mainly made of polyethylene or polyvinyl chloride, among other materials. Polyethylene has advantages such as low cost, high flexibility, and good corrosion resistance, making it widely used. However, polyethylene has relatively low strength and is prone to cracking and breakage under external force or prolonged bending, affecting the protective performance of the sheath layer.

[0003] Polybenzoxazine is a high-performance resin material with high toughness, high strength, and strong high-temperature resistance, and it has important applications in epoxy resins, polyolefins, and phenolic resins. Patent CN118272004B discloses a polyethylene adhesive and its preparation method, which uses polyethylene, maleic anhydride-grafted polyethylene, and silicon-containing benzoxazine as raw materials. The resulting polyethylene material exhibits excellent tensile and high-temperature resistance properties; however, this patent does not improve the flexural strength or bending resistance of polyethylene. Summary of the Invention

[0004] (a) The technical problem solved by this invention is the low strength of the optical fiber in AOC connectors.

[0005] (II) The technical solution of the present invention is: a method for preparing a high-toughness, bending-resistant AOC connector, wherein the AOC connector includes an optical cable assembly and an AOC connector head; the optical cable assembly includes an optical fiber, an aramid yarn layer, a polyethylene outer sheath, and a braided layer; the method for preparing the polyethylene outer sheath is as follows:

[0006] (1) Add sodium hydroxide aqueous solution to 1,4-dioxane, add formaldehyde aqueous solution, 1,3,5-tris(4-aminophenyl)benzene, and phenol. After the reaction, concentrate the solution under reduced pressure, wash the product with water, and then recrystallize in a mixed solvent of isopropanol and dichloromethane to obtain 1,3,5-tris(4-benzoxazinephenyl)benzene.

[0007] (2) Polyethylene, 4-hydroxystyrene and dicumyl peroxide are mixed and melt-grafted in a screw extruder. The product is added to xylene, heated and stirred. The solution is poured into a mixed solvent of acetone and ethyl acetate. After filtration, the precipitate is washed with acetone and ethyl acetate and dried to obtain 4-hydroxystyrene-grafted polyethylene.

[0008] (3) Mix polyethylene, 4-hydroxystyrene-grafted polyethylene, 1,3,5-tris(4-benzoxazinephenyl)benzene and antioxidant, extrude through a screw extruder, granulate, and then place in an oven for heat treatment and cooling to obtain a polyethylene outer sheath.

[0009] Preferably, the braided layer is made of woven fibers, and the fibers are one or more of polyester fibers and nylon fibers.

[0010] Preferably, the optical cable assembly may also have an inner sheath, which is a cross-linked polyethylene layer.

[0011] Preferably, in (1), sodium hydroxide aqueous solution is added dropwise to adjust the pH to 9.5-10.

[0012] Preferably, the molar ratio of formaldehyde, 1,3,5-tris(4-aminophenyl)benzene and phenol in (1) is (5.1-6):1:(3-3.6).

[0013] Preferably, the reaction in (1) is stirred, condensed and refluxed at 90-100℃ for 6-10h.

[0014] Preferably, in (2), the mass ratio of polyethylene, 4-hydroxystyrene, and dicumyl peroxide is 100:(2-5):(0.1-0.3).

[0015] Preferably, in (2), the temperature during molten grafting is 190-200℃, the time is 8-12min, and the screw speed is 30-50r / min.

[0016] Preferably, in (3), the mass ratio of polyethylene, 4-hydroxystyrene-grafted polyethylene, 1,3,5-tris(4-benzoxazinephenyl)benzene, antioxidant, and halogen-free flame retardant is 100:(0.3-1):(2-5):(0.1-0.2):(20-30).

[0017] Preferably, the antioxidant in (3) includes antioxidant 1076.

[0018] Preferably, the halogen-free flame retardant in (3) includes any one or combination of aluminum hydroxide, ammonium polyphosphate, and zinc borate.

[0019] Preferably, in (3), the temperature of each section of the screw extruder is 155-190℃ and the screw speed is 70-120r / min.

[0020] Preferably, in (3), the heat treatment process is to first carry out the heat treatment at 150-160℃ for 2-3 hours, and then carry out the heat treatment at 200-210℃ for 2-3 hours.

[0021] (III) Beneficial Technical Effects: This invention uses highly flexible polyethylene as a matrix, and melt-mixes it with 4-hydroxystyrene-grafted polyethylene, 1,3,5-tris(4-benzoxazinephenyl)benzene, halogen-free flame retardant, etc., followed by heat treatment to obtain a polyethylene outer sheath for AOC connector optical fibers. 1,3,5-tris(4-benzoxazinephenyl)benzene contains multiple oxazine ring crosslinking polymerization sites. During heat treatment, multiple benzoxazine structures undergo ring opening and crosslink with the phenolic hydroxyl structures of the grafted polyethylene, uniformly forming a polybenzoxazine crosslinking system in the polyethylene matrix. This increases the degree of crosslinking of the molecular chains inside the polyethylene, making it less prone to relative slippage under external force, increasing its resistance to deformation, improving creep resistance and dimensional stability. This gives the polyethylene outer sheath both good strength and high toughness bending resistance, which is beneficial for improving the bending resistance and protection performance of AOC connector optical cables, preventing cracking between the connector head and the optical cable due to external force or long-term bending, and ensuring good signal transmission stability of the connector optical cable.

[0022] The polybenzoxazine of the present invention contains a high-temperature resistant triphenylbenzene aromatic crosslinked network structure. When introduced into a polyethylene matrix, it can improve its heat resistance and significantly increase the thermal decomposition temperature, thereby improving the high-temperature resistance and heat aging resistance of AOC connector optical cables. Attached Figure Description

[0023] Figure 1 This is a structural diagram of the AOC connector optical cable assembly.

[0024] Figure 2 This is a structural diagram of an AOC connector optical cable assembly including an inner sheath.

[0025] Figure 3 This is the infrared spectrum of 1,3,5-tris(4-benzoxazinephenyl)benzene. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Modifications or equivalent substitutions made by those skilled in the art based on their understanding of the technical solutions of this invention, without departing from the spirit and scope of the invention, should be covered within the protection scope of this invention.

[0027] Example 1: The AOC connector consists of an optical cable assembly and an AOC connector head; Figure 1 The optical fiber cable assembly consists of optical fibers, an aramid yarn layer, a polyethylene outer sheath, and a polyester fiber braided layer. The preparation method of the polyethylene outer sheath is as follows:

[0028] (1) Add 20% sodium hydroxide aqueous solution to 90 mL of 1,4-dioxane, adjust the pH to 10, add 13 mL of aqueous solution containing 120 mmol formaldehyde, 20 mmol 1,3,5-tris(4-aminophenyl)benzene and 66 mmol phenol, heat to 100 °C, stir and reflux for 6 h, concentrate the solution under reduced pressure, wash the product with water, and then recrystallize in a mixed solvent of isopropanol and dichloromethane in a volume ratio of 1:2 to obtain 1,3,5-tris(4-benzoxazinephenyl)benzene. Figure 2 The infrared spectrum of 1520-1409 cm⁻¹ -1 It is a characteristic peak of the benzene ring skeleton, 965 cm⁻¹ -1 It is a characteristic peak of the benzoxazine ring, 1338 cm⁻¹ -1 The absorption peak is at 1205 cm⁻¹, representing the CN bond of the oxazine ring. -1 This is the absorption peak of the COC bond in the benzoxazine ring. The reaction equation is:

[0029] .

[0030] (2) Mix 50g of polyethylene (model LDPE 1800H, Suzhou Xinleda Plastics, the same below), 1g of 4-hydroxystyrene, and 0.05g of dicumyl peroxide, place them in a screw extruder, set the screw speed to 30r / min, melt graft at 200℃ for 8min, extrude, add the product to xylene, heat to 140℃, stir, pour the solution into a mixed solvent of acetone and ethyl acetate, filter, wash the precipitate with acetone and ethyl acetate, dry, and obtain 4-hydroxystyrene grafted polyethylene.

[0031] (3) Mix 3 kg of polyethylene (model LDPE 1800H, Suzhou Xinleda Plastics, the same below), 9 g of 4-hydroxystyrene-grafted polyethylene, 60 g of 1,3,5-tris(4-benzoxazinephenyl)benzene, 6 g of antioxidant 1076, 220 g of aluminum hydroxide, and 460 g of ammonium polyphosphate. Extrude and granulate the mixture in a screw extruder at temperatures of 155℃, 175℃, 190℃, 190℃, and 185℃ in each section and at a screw speed of 70 r / min. Then place the mixture in an oven and heat-treat it at 150℃ for 3 h, then at 210℃ for 2 h. After cooling, the polyethylene outer protective layer is obtained.

[0032] Comparative Example 1: The AOC connector consists of an optical cable assembly and an AOC connector head; the optical cable assembly consists of optical fiber, an aramid yarn layer, a polyethylene outer sheath, and a polyester fiber braided layer. The preparation method of the polyethylene outer sheath is as follows:

[0033] (1) Mix 3 kg of polyethylene, 6 g of antioxidant 1076, 220 g of aluminum hydroxide and 460 g of ammonium polyphosphate, and extrude them into granules in a screw extruder at temperatures of 155℃, 175℃, 190℃, 190℃ and 185℃ in each section and at a screw speed of 70 r / min. Then place the granules in an oven and heat-treat them at 150℃ for 3 h and then at 210℃ for 2 h. After cooling, the polyethylene outer protective layer is obtained.

[0034] Comparative Example 2: The AOC connector consists of an optical cable assembly and an AOC connector head; the optical cable assembly consists of optical fiber, an aramid yarn layer, a polyethylene outer sheath, and a polyester fiber braided layer. The preparation method of the polyethylene outer sheath is as follows:

[0035] (1) 4-hydroxystyrene-grafted polyethylene was prepared according to the method of Example 1.

[0036] (2) Mix 3 kg of polyethylene, 9 g of 4-hydroxystyrene-grafted polyethylene, 6 g of antioxidant 1076, 220 g of aluminum hydroxide and 460 g of ammonium polyphosphate, and extrude them into granules in a screw extruder at temperatures of 155℃, 175℃, 190℃, 190℃ and 185℃ in each section and a screw speed of 70 r / min. Then place the granules in an oven and heat-treat them at 150℃ for 3 h and then at 210℃ for 2 h. After cooling, the polyethylene outer protective layer is obtained.

[0037] Comparative Example 3: The AOC connector consists of an optical cable assembly and an AOC connector head; the optical cable assembly consists of optical fiber, an aramid yarn layer, a polyethylene outer sheath, and a polyester fiber braided layer. The preparation method of the polyethylene outer sheath is as follows:

[0038] (1) 1,3,5-tris(4-benzoxazinephenyl)benzene was prepared according to the method of Example 1.

[0039] (2) Mix 3 kg of polyethylene, 60 g of 1,3,5-tris(4-benzoxazinephenyl)benzene, 6 g of antioxidant 1076, 220 g of aluminum hydroxide and 460 g of ammonium polyphosphate. Extrude and granulate the mixture in a screw extruder at temperatures of 155°C, 175°C, 190°C, 190°C and 185°C in each section and at a screw speed of 70 r / min. Then place the mixture in an oven and heat-treat it at 150°C for 3 h and then at 210°C for 2 h. After cooling, the polyethylene outer protective layer is obtained.

[0040] Comparative Example 4: The AOC connector consists of an optical cable assembly and an AOC connector head; the optical cable assembly consists of optical fiber, an aramid yarn layer, a polyethylene outer sheath, and a polyester fiber braided layer. The preparation method of the polyethylene outer sheath is as follows:

[0041] (1) Pa benzoxazine was prepared according to the method described in the journal article "Study on EP / phenol-aniline type monocyclic benzoxazine resin copolymer system" published in the October 2010 issue of China Adhesives, Vol. 19, No. 10. The structural formula is as follows: .

[0042] (2) Prepare 4-hydroxystyrene-grafted polyethylene according to the method of Example 1.

[0043] (3) Mix 3 kg of polyethylene, 9 g of 4-hydroxystyrene-grafted polyethylene, 60 g of Pa benzoxazine, 6 g of antioxidant 1076, 220 g of aluminum hydroxide and 460 g of ammonium polyphosphate. Extrude and granulate the mixture in a screw extruder at temperatures of 155°C, 175°C, 190°C, 190°C and 185°C in each section and at a screw speed of 70 r / min. Then place the mixture in an oven and heat-treat it at 150°C for 3 h and then at 210°C for 2 h. After cooling, a polyethylene outer protective layer is obtained.

[0044] Comparative Example 5: The AOC connector consists of an optical cable assembly and an AOC connector head; the optical cable assembly consists of optical fiber, an aramid yarn layer, a polyethylene outer sheath, and a polyester fiber braided layer. The preparation method of the polyethylene outer sheath is as follows:

[0045] (1) Diaminodiphenylmethane-type benzoxazine was prepared according to the method described in the journal article "Synthesis, Characterization and Thermal Analysis of Diamine-type Benzoxazine Intermediates" published in Volume 37, 2008, *Petrochemical Technology*. The structural formula is as follows: .

[0046] (2) Prepare 4-hydroxystyrene-grafted polyethylene according to the method of Example 1.

[0047] (3) Mix 3 kg of polyethylene, 9 g of 4-hydroxystyrene-grafted polyethylene, 60 g of diaminodiphenylmethane-type benzoxazine, 6 g of antioxidant 1076, 220 g of aluminum hydroxide, and 460 g of ammonium polyphosphate. Extrude and granulate the mixture in a screw extruder at temperatures of 155°C, 175°C, 190°C, 190°C, and 185°C in each section and at a screw speed of 70 r / min. Then place the mixture in an oven and heat-treat it at 150°C for 3 h, then at 210°C for 2 h. After cooling, a polyethylene outer protective layer is obtained.

[0048] Comparative Example 6: The AOC connector consists of an optical cable assembly and an AOC connector head; the optical cable assembly consists of optical fiber, an aramid yarn layer, a polyethylene outer sheath, and a polyester fiber braided layer. The method for preparing the polyethylene outer sheath is as follows:

[0049] (1) 1,3,5-tris(4-benzoxazinephenyl)benzene was prepared according to the method of Example 1.

[0050] (2) Mix 50g polyethylene, 1g maleic anhydride and 0.05g dicumyl peroxide, place them in a screw extruder, set the screw speed to 30r / min, melt graft at 200℃ for 8min, extrude, add the product to xylene, heat to 140℃, stir, pour the solution into a mixed solvent of acetone and ethyl acetate, filter, wash the precipitate with acetone and ethyl acetate, dry, and obtain maleic anhydride grafted polyethylene.

[0051] (3) Mix 3 kg of polyethylene, 9 g of maleic anhydride-grafted polyethylene, 60 g of 1,3,5-tris(4-benzoxazinephenyl)benzene, 6 g of antioxidant 1076, 220 g of aluminum hydroxide, and 460 g of ammonium polyphosphate. Extrude and granulate the mixture in a screw extruder at temperatures of 155°C, 175°C, 190°C, 190°C, and 185°C in each section and at a screw speed of 70 r / min. Then place the mixture in an oven and heat-treat it at 150°C for 3 h, then at 210°C for 2 h. After cooling, a polyethylene outer protective layer is obtained.

[0052] Example 2: The AOC connector consists of an optical cable assembly and an AOC connector head; Figure 2 The optical fiber cable assembly consists of optical fibers, an aramid yarn layer, a cross-linked polyethylene inner sheath, another aramid yarn layer, an outer polyethylene sheath, and a polyester fiber braided layer. The preparation method of the polyethylene outer sheath is as follows:

[0053] (1) Add 25% sodium hydroxide aqueous solution to 100 mL of 1,4-dioxane to adjust the pH to 9.5. Add 13 mL of aqueous solution containing 120 mmol formaldehyde, 20 mmol 1,3,5-tris(4-aminophenyl)benzene, and 60 mmol phenol. Heat to 90 °C, stir and reflux for 10 h. Concentrate the solution under reduced pressure, wash the product with water, and then recrystallize in a mixed solvent of isopropanol and dichloromethane in a volume ratio of 1:2 to obtain 1,3,5-tris(4-benzoxazinephenyl)benzene.

[0054] (2) Mix 50g polyethylene, 1.7g 4-hydroxystyrene and 0.09g dicumyl peroxide, place them in a screw extruder, set the screw speed to 50r / min, melt graft at 190℃ for 10min, extrude, add the product to xylene, heat to 140℃, stir, pour the solution into a mixed solvent of acetone and ethyl acetate, filter, wash the precipitate with acetone and ethyl acetate, dry, and obtain 4-hydroxystyrene grafted polyethylene.

[0055] (3) Mix 3 kg of polyethylene, 20 g of 4-hydroxystyrene-grafted polyethylene, 110 g of 1,3,5-tris(4-benzoxazinephenyl)benzene, 4 g of antioxidant 1076, 150 g of zinc borate and 650 g of ammonium polyphosphate. Extrude and granulate the mixture in a screw extruder at temperatures of 155°C, 175°C, 190°C, 190°C and 185°C in each section and at a screw speed of 120 r / min. Then place the mixture in an oven and heat-treat it at 150°C for 3 h and then at 200°C for 3 h. After cooling, a polyethylene outer protective layer is obtained.

[0056] Example 3: The AOC connector consists of an optical cable assembly and an AOC connector head; the optical cable assembly consists of an optical fiber, an aramid yarn layer, a polyethylene outer sheath, and a nylon fiber braided layer. The method for preparing the polyethylene outer sheath is as follows:

[0057] (1) Add 20% sodium hydroxide aqueous solution to 100 mL of 1,4-dioxane, adjust the pH to 10, add 10 mL of aqueous solution containing 102 mmol formaldehyde, 20 mmol 1,3,5-tris(4-aminophenyl)benzene, and 72 mmol phenol, heat to 100 °C, stir and reflux for 7 h, concentrate the solution under reduced pressure, wash the product with water, and then recrystallize in a mixed solvent of isopropanol and dichloromethane in a volume ratio of 1:2 to obtain 1,3,5-tris(4-benzoxazinephenyl)benzene.

[0058] (2) Mix 50g polyethylene, 2.5g 4-hydroxystyrene and 0.15g dicumyl peroxide, place them in a screw extruder, set the screw speed to 50r / min, melt graft at 190℃ for 12min, extrude, add the product to xylene, heat to 140℃, stir, pour the solution into a mixed solvent of acetone and ethyl acetate, filter, wash the precipitate with acetone and ethyl acetate, dry, and obtain 4-hydroxystyrene grafted polyethylene.

[0059] (3) Mix 3 kg of polyethylene, 30 g of 4-hydroxystyrene-grafted polyethylene, 150 g of 1,3,5-tris(4-benzoxazinephenyl)benzene, 3 g of antioxidant 1076, 150 g of aluminum hydroxide, and 450 g of ammonium polyphosphate. Extrude and granulate the mixture in a screw extruder at temperatures of 155°C, 175°C, 190°C, 190°C, and 185°C in each section and at a screw speed of 120 r / min. Then place the mixture in an oven and heat-treat it at 160°C for 2 h, then at 210°C for 2 h. After cooling, a polyethylene outer protective layer is obtained.

[0060] The polyethylene outer sheath was injection molded into test strips, and its tensile properties were tested according to standard GB / T 1040.1-2025. Flexural strength was tested according to standard GB / T 9341-2008.

[0061] Weigh 5 mg of polyethylene outer sheath and place it in a thermogravimetric analyzer. Perform thermal performance analysis in a nitrogen atmosphere with a heating rate of 5℃ / min and a temperature range of 20-700℃.

[0062] The test results of the performance test of the polyethylene outer sheath are shown in Table 1.

[0063] Table 1 Performance Tests of Polyethylene Outer Sheath

[0064]

[0065] Compared to Comparative Example 1, the polyethylene in Example 1 was grafted with 1,3,5-tris(4-benzoxazinephenyl)benzene and 4-hydroxystyrene. 1,3,5-tris(4-benzoxazinephenyl)benzene contains multiple benzoxazine structures, resulting in more crosslinking polymerization sites. During heat treatment, the benzoxazine undergoes ring-opening and crosslinks with the phenolic hydroxyl structures of the grafted polyethylene, uniformly forming a polybenzoxazine crosslinking system within the polyethylene matrix. This increases the degree of crosslinking of the polyethylene molecular chains, making it less prone to relative slippage under external force, increasing its resistance to deformation, improving creep resistance and dimensional stability, and exhibiting higher tensile and flexural strength. This gives the polyethylene outer sheath both good strength and high-toughness bending resistance. Furthermore, the polybenzoxazine contains a high-temperature resistant triphenylbenzene aromatic crosslinking network structure, which, when introduced into the polyethylene matrix, improves its heat resistance and significantly increases its thermal decomposition temperature. In Examples 2 and 3, different proportions of 1,3,5-tris(4-benzoxazinephenyl)benzene and other raw materials were added to prepare polyethylene outer sheaths that also had high tensile strength, flexural strength and thermal decomposition temperature.

[0066] Compared to Example 1, Comparative Example 2 did not contain 1,3,5-tris(4-benzoxazinephenyl)benzene, and its polyethylene outer sheath had very low tensile strength, flexural strength, and thermal decomposition temperature.

[0067] In Comparative Example 3, no 4-hydroxystyrene-grafted polyethylene was added. 1,3,5-tris(4-benzoxazinephenyl)benzene itself underwent cross-linking polymerization. The resulting polybenzoxazine had poor compatibility with the polyethylene matrix, and the tensile strength, flexural strength, and thermal decomposition temperature of the polyethylene outer sheath were significantly lower than those in Example 1.

[0068] The Pa benzoxazine and diaminodiphenylmethane-type benzoxazine in Comparative Examples 4 and 5 have fewer oxazine ring crosslinking polymerization sites and do not contain a high-temperature resistant triphenylbenzene polyaromatic ring structure. The tensile strength, flexural strength, and thermal decomposition temperature of their polyethylene outer sheaths are all lower than those in Example 1. In Comparative Example 6, maleic anhydride-grafted polyethylene was used instead of 4-hydroxystyrene-grafted polyethylene, and the tensile strength and flexural strength of the prepared polyethylene outer sheath are also significantly lower than those in Example 1.

[0069] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for manufacturing a high-toughness, bending-resistant AOC connector, characterized in that, The AOC connector includes an optical cable assembly and an AOC connector head; the optical cable assembly includes an optical fiber, an aramid yarn layer, a polyethylene outer sheath, and a braided layer; The preparation method of the polyethylene outer sheath includes: mixing polyethylene, 4-hydroxystyrene-grafted polyethylene, 1,3,5-tris(4-benzoxazinephenyl)benzene, antioxidant, and halogen-free flame retardant, extruding the mixture through a screw extruder, granulating it, and then placing it in an oven for heat treatment and cooling to obtain the polyethylene outer sheath. The structural formula of 1,3,5-tris(4-benzoxazinephenyl)benzene is as follows: ; The mass ratio of the polyethylene, 4-hydroxystyrene-grafted polyethylene, 1,3,5-tris(4-benzoxazinephenyl)benzene, antioxidant, and halogen-free flame retardant is 100:(0.3-1):(2-5):(0.1-0.2):(20-30).

2. The method for preparing the high-toughness, bending-resistant AOC connector according to claim 1, characterized in that, The braided layer is made of fibers, which are one or more of polyester fibers and nylon fibers. The optical cable assembly has an inner sheath, which is a cross-linked polyethylene layer.

3. The method for preparing the high-toughness, bending-resistant AOC connector according to claim 1, characterized in that, The antioxidant includes antioxidant 1076, and the halogen-free flame retardant includes any one or a combination of aluminum hydroxide, ammonium polyphosphate, and zinc borate.

4. The method for preparing the high-toughness, bending-resistant AOC connector according to claim 1, characterized in that, The temperature of each section of the screw extruder is 155-190℃, and the screw speed is 70-120 r / min.

5. The method for preparing the high-toughness, bending-resistant AOC connector according to claim 1, characterized in that, The heat treatment process involves first performing the heat treatment at 150-160℃ for 2-3 hours, and then performing it at 200-210℃ for 2-3 hours.

6. The method for preparing the high-toughness, bending-resistant AOC connector according to claim 1, characterized in that, The preparation method of 1,3,5-tris(4-benzoxazinephenyl)benzene is as follows: sodium hydroxide aqueous solution is added dropwise to 1,4-dioxane to adjust the pH to 9.5-10, and formaldehyde aqueous solution, 1,3,5-tris(4-aminophenyl)benzene, and phenol are added, wherein the molar ratio of formaldehyde, 1,3,5-tris(4-aminophenyl)benzene, and phenol is (5.1-6):1:(3-3.6); the mixture is heated to 90-100℃, stirred, refluxed, and reacted for 6-10 hours, the solution is concentrated under reduced pressure, the product is washed with water, and then recrystallized in a mixed solvent of isopropanol and dichloromethane to obtain 1,3,5-tris(4-benzoxazinephenyl)benzene.

7. The method for preparing the high-toughness, bending-resistant AOC connector according to claim 1, characterized in that, The preparation method of the 4-hydroxystyrene-grafted polyethylene is as follows: polyethylene, 4-hydroxystyrene, and dicumyl peroxide are mixed and placed in a screw extruder. The screw speed is set to 30-50 r / min, and melt grafting is carried out at 190-200℃ for 8-12 min. The product is extruded and added to xylene. The mixture is heated and stirred. The solution is poured into a mixed solvent of acetone and ethyl acetate. After filtration, the precipitate is washed and dried to obtain 4-hydroxystyrene-grafted polyethylene.

8. The method for preparing the high-toughness, bending-resistant AOC connector according to claim 7, characterized in that, The mass ratio of the polyethylene, 4-hydroxystyrene, and dicumyl peroxide is 100:(2-5):(0.1-0.3).

9. A high-toughness, bending-resistant AOC connector obtained by the preparation method according to any one of claims 1-8.

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