Infrastructure high-efficiency transmission power optical cable and processing technology thereof

Abstract

The invention discloses a capital construction high-efficiency transmission power optical cable and a processing technology thereof, belongs to the technical field of cable processing, and aims to solve the problems that the flame retardance and the water resistance of filling paste for preparing a power optical cable material in the prior art need to be improved; and the impact resistance and other mechanical properties of the prepared power cable need to be further enhanced. The invention discloses a capital construction efficient transmission power optical cable. The capital construction efficient transmission power optical cable comprises an optical cable inner part and an optical cable outer part, the optical cable internally comprises a reinforcing core and an optical unit, and the optical cable is filled with paste. A sheath is arranged outside the optical cable, and the sheath is obtained by melting and extruding a modified sheath material. The modified sheath material comprises high-density polyethylene, modified polyester and the like; the modified polyester is obtained by reacting an intermediate and an ester. The paste is composed of silicone oil, a water-absorbing flame-retardant material and the like. The prepared electric optical cable has the advantages of being high in mechanical strength, flame-retardant and waterproof.

Description

Technical Field

[0001] The present invention relates to the technical field of cable processing, and in particular to an infrastructure high-efficiency power transmission optical cable and a processing technology thereof. Background Art

[0002] New power optical cables rely on high-voltage power lines distributed across vast areas to provide data transmission for power communication networks. Since a significant portion of 5G base station construction, and the soon-to-be-launched B5G base station construction, is located in remote areas or countries and regions with complex climates, these base station construction requires power optical cables, which serve as transmission lines, to be more robust, adaptable, and precise. Improving cable material composition, thereby enhancing mechanical and flame-retardant properties, and ultimately improving the adaptability and durability of power optical cables in complex environments, is a pressing technical challenge.

[0003] Furthermore, to mitigate the effects of external forces such as moisture and water in the air on optical fibers, a paste is added during the optical fiber cable manufacturing process to provide waterproofing, moisture-proofing, and buffering and lubrication, thereby ensuring high stability and reliability of optical fiber communications. Patent application CN1280387C discloses a communication optical cable filling paste comprising rubber oil, refrigeration oil, ethylene propylene rubber, polyethylene, polypropylene, and related additives; the water-blocking agent is an expanding powder. However, the compatibility of these components is not high, and mechanical properties such as impact strength of the cable material filled with this paste cannot be guaranteed.

[0004] In view of the technical defects in this aspect, a solution is now proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide an infrastructure high-efficiency transmission power optical cable and its processing technology, which are used to solve the technical problems in the existing technology of preparing power optical cable materials, the flame retardancy and waterproofness of the filling paste need to be improved; and the mechanical properties such as impact resistance of the prepared power cable need to be further enhanced.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A high-efficiency power transmission optical cable for infrastructure construction, wherein the interior of the high-efficiency power transmission optical cable for infrastructure construction includes a reinforcing core and an optical unit in sequence; wherein the optical unit is formed by an aluminum tube covering an optical fiber, and the interior of the optical cable is filled with a paste; a sheath is provided on the inner surface of the optical cable, wherein the sheath is obtained by melt-extrusion of a modified sheath material.

[0008] Furthermore, the preparation method of the modified sheath material comprises the following steps:

[0009] A1, 2,5-furandicarboxylic acid and hydroxyethyl methacrylate are mixed and esterified at 180-200°C until the amount of by-product water distilled out is greater than 95%, which is considered to be the end of the esterification reaction, thereby synthesizing an esterified product;

[0010] Through esterification reaction, 2,5-difurandicarboxylic acid and hydroxyethyl methacrylate react to synthesize an esterified product, and the reaction formula is as follows:

[0011]

[0012] A2. Deionized water is added to a reactor, and a NaOH solution is added dropwise to the deionized water to adjust the pH value of the deionized water to 8-9; ethylene gas is introduced into the reactor to replace the air in the reactor with ethylene gas; N-vinyl carbazole, a dispersant, an initiator, and an emulsifier are then added to the reactor and mixed to obtain a reactant; the reactant is polymerized at 80-100° C. to obtain an intermediate; an esterified product is then added to react to obtain a product; the product is subjected to post-processing to synthesize a modified polyester;

[0013] N-vinylcarbazole and ethylene undergo nucleophilic addition to obtain the intermediate as follows:

[0014]

[0015] Using deionized water as solvent, in the presence of relevant additives, N-vinylcarbazole reacts with ethylene to synthesize an intermediate; the intermediate then reacts with an ester to synthesize a modified polyester. The reaction formula is as follows:

[0016]

[0017] A3, high-density polyethylene, ultraviolet crosslinking agent, antioxidant, mixed inorganic powder and modified polyester are mixed to obtain a mixture; the mixture is melt-masticated to obtain a plasticized mixture; the plasticized mixture is vulcanized to synthesize a modified sheath material.

[0018] Furthermore, in step A1, the amount ratio of 2,5-furandicarboxylic acid and hydroxyethyl methacrylate is 7-14g:1.3-2.6g; in step A2, the dispersant is polyvinyl alcohol, the initiator is azobisisobutyronitrile, and the emulsifier is sodium stearate; the amount ratio of deionized water, N-vinyl carbazole, dispersant, initiator, and emulsifier is 200mL:9-18g:3-5g:0.1-0.3g:0.15-2.5g; the polymerization reaction time is 3-6h, and the reaction time of adding the ester is 2-4h; the post-processing steps include: filtering the product solid, then distilling under reduced pressure, removing deionized water, and synthesizing the modified polyester.

[0019] Furthermore, in step A3, the UV crosslinking agent is any one of triallyl cyanurate, triallyl isocyanurate, and trimethylolpropane triacrylate; the antioxidant is any one of antioxidant 1010, antioxidant 1076, or antioxidant 264; in parts by weight, the amount ratio of the high-density polyethylene, UV crosslinking agent, antioxidant, mixed inorganic powder, and modified polyester is 70-80:1-2:1-5:3-12; the melt-masticating temperature is 165-175°C, and the melt-masticating time is 5-10 min; the vulcanization temperature is 170-180°C, and the press molding time is 5-15 min.

[0020] Furthermore, the preparation method of the paste comprises the following steps:

[0021] B1. Blending lignin and glycidol to obtain a blend; adding a curing agent to the blend and mixing to obtain a mixture; and curing the mixture to obtain a water-absorbing flame-retardant material;

[0022] B2. According to parts by weight, 70-80 parts of silicone oil, 5-10 parts of gelling agent fatty acid salt, 3-12 parts of water-absorbing flame retardant material and 3-5 parts of antioxidant are mixed to prepare a paste.

[0023] Furthermore, in step B1, the curing agent is diethylenetriamine, and the usage ratio of lignin, glycidol and curing agent is 30-50:10-20:2-3g; the curing temperature is 90-110°C, and the curing time is 1-2h; in step B2, the gelling agent is any one of sodium stearate, potassium stearate or magnesium stearate; and the antioxidant is tert-butylhydroquinone.

[0024] As another aspect of the present invention, a process for processing an infrastructure high-efficiency power transmission optical cable comprises the following steps:

[0025] S1, the strengthening core is used as the center of the circle; the aluminum tube is covered with the optical fiber to form an optical unit, and the optical unit and the steel wire are SZ-twisted at intervals using an SZ optical cable stranding machine to form the inner part of the optical cable;

[0026] S2. Use liquid extrusion curing molding technology to fill the paste inside the optical cable at an extrusion temperature of 150-200°C; set a modified sheath material on the inner surface of the optical cable. After the cable is formed, a high-efficiency power transmission optical cable is prepared.

[0027] Furthermore, in step S1, the diameter of the reinforcing core is 0.4-0.5 mm; the diameter of the aluminum tube is 2-3 mm, and the wall thickness is 0.4-0.5 mm; the twisting speed is 500-600 r / min; in step S2, the paste filling amount is 5-8% of the total weight of the power optical cable, and the thickness of the outer sheath is 2-3 mm.

[0028] The present invention has the following beneficial effects:

[0029] 1. The electric power optical cable prepared by the present invention uses a reinforcing core as the center of the circle, and an aluminum tube-coated optical fiber as an optical unit. Multiple optical units are placed in a single tube in a discrete manner; the optical unit and the steel wire are SZ-twisted at intervals. During the twisting process, the twisting equipment is modified to adopt an SZ differential structure; the PLC logic operation generates an interactive signal to control the forward and reverse operation of the motor, thereby synchronously controlling the switching speed and the twisting speed. The present invention adopts an eccentric core design and SZ twisting, which can reduce the bearing capacity of the core unit of the electric power optical cable, enhance the mechanical properties and improve the durability of the electric power optical cable. The paste is filled in the tube to ensure that the optical fibers have space to creep without affecting each other. The paste is filled with thermoplastic material liquid extrusion curing molding technology, which can significantly improve the density of the tube; the outer sheath is prepared by melt extrusion of the modified sheath material.

[0030] 2. The internal filling paste for power optical cables prepared by the present invention incorporates an appropriate amount of a water-absorbing flame-retardant material into the base silicone oil component. Lignin is inherently highly hygroscopic, thus enhancing its waterproof properties. Furthermore, lignin is highly flame-retardant. Lignin and glycidol are cured and reacted at high temperature to form a water-absorbing flame-retardant material. Glycidol reacts with the curing agent to form a cross-linked structure, enhancing the strength and hardness of the filling paste.

[0031] 3. The power cable prepared by the present invention is prepared by melt-extrusion modified sheath material, and an outer sheath structure is provided; the outer sheath material uses high-density polyethylene as a base material, and modified polyester is added to toughen and improve its own impact resistance. In addition, the synthesized modified polyester has high insulation properties, and when doped into the prepared sheath material, the dielectric properties of the prepared cable can be improved. The modified polyester and high-density polyethylene are melt-plasticized and vulcanized to prepare a modified sheath material. The modified polyester can not only further increase the density and mechanical properties of the prepared modified sheath material, but also avoid the large polarity difference between high-density polyethylene and polyester, reduce the generation of two-phase structure, thereby enhancing the interfacial bonding force of the two components and improving its own mechanical properties. An appropriate amount of mixed inorganic powder is added to the above-mentioned modified sheath material, and the mixed inorganic powder is obtained by mixing and grinding silicon powder and whisker silicon. The mixed inorganic powder can improve the limitations of the target product in extremely cold environments, improve the durability of the prepared power optical cable and lower the freezing point, while increasing the bending strength of the optical cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 This is a structural diagram of the infrastructure high-efficiency power transmission optical cable prepared by the present invention. DETAILED DESCRIPTION

[0034] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. 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 creative efforts are within the scope of protection of the present invention.

[0035] The silicon powder used in Examples 1-3 of the present invention was purchased from Shanghai Pantian Powder Materials Co., Ltd., with the product number PT-Si-30nm, an average particle size of 30nm, and a specific surface area of 98m 2 / g, and the bulk density is 0.05g / cm 3 The whisker silicon used in Examples 1-3 of the present invention was purchased from Shanghai Huijing Sub-Nano New Materials Co., Ltd., with a particle size of 1-5 μm and a bulk density of 0.65 g / cm 3 , Mohs hardness is 7; the high-density polyethylene used in Examples 1-3 of the present invention was purchased from Shanghai Yanxing Plastics Co., Ltd., with the item number 1508S; the silicone oil used in Examples 4-6 of the present invention was purchased from Jiashan Jiangnan Textile Materials Co., Ltd., with the item number 201.

[0036] Example 1

[0037] This embodiment provides a method for preparing a modified sheath material for an infrastructure high-efficiency power transmission optical cable, comprising the following steps:

[0038] A1. Add 7 g of 2,5-furandicarboxylic acid and 1.3 g of hydroxyethyl methacrylate to a 250 mL three-necked flask equipped with a stirring device and a spherical condenser. Mix thoroughly and allow an esterification reaction to proceed to obtain a reactant. The esterification reaction is performed at 180°C until the distillation of the byproduct water exceeds 95%, which indicates the completion of the esterification reaction.

[0039] A2. A 500mL reactor equipped with a stirrer, thermometer, and condenser was added to the reactor. 200mL of deionized water was added, followed by a 0.1mol / L NaOH solution dropwise to adjust the pH of the deionized water to 8. Ethylene gas was introduced into the reactor to displace all air. 9g of N-vinylcarbazole, 3g of polyvinyl alcohol (dispersant), 0.1g of azobisisobutyronitrile (initiator), and 0.15g of sodium stearate (emulsifier) were added and mixed to obtain the reactants. The reactor was heated to 80°C and polymerization was carried out at this temperature for 3 hours to obtain the intermediate. 8g of the esterified product was then added to the reactor and the reaction continued at 80°C for 2 hours to obtain the product. The solid product was filtered, and the deionized water solvent was removed by vacuum distillation to synthesize the modified polyester.

[0040] A3. Mix silicon powder and whisker silicon (using whisker silicon with a particle size of 5 μm) in a mass ratio of 1:1 and grind to 200 mesh to obtain a mixed inorganic powder. According to parts by weight, 70 parts of high-density polyethylene, 1 part of triallyl cyanurate, 0.5 parts of antioxidant 1010, 1 part of mixed inorganic powder and 3 parts of modified polyester are mixed to obtain a mixture. The mixture is added to the twin rollers of a plasticizer for melt plastication at a temperature of 165°C and a melt plastication time of 5 minutes to obtain a plasticized mixture; the plasticized mixture is added to a flat vulcanizer for compression molding. The temperature of the flat vulcanizer is set to 170°C and the compression molding time is 5 minutes to synthesize the modified sheath material.

[0041] Example 2

[0042] This embodiment provides a method for preparing a modified sheath material for an infrastructure high-efficiency power transmission optical cable, comprising the following steps:

[0043] A1. Add 10 g of 2,5-furandicarboxylic acid and 1.9 g of hydroxyethyl methacrylate to a 250 mL three-necked flask equipped with a stirring device and a spherical condenser. Mix thoroughly and perform an esterification reaction to obtain a reactant. The esterification reaction is performed at 190°C until the distillation of the byproduct water exceeds 95%, which indicates that the esterification reaction is complete.

[0044] A2. A 500mL reactor equipped with a stirrer, thermometer, and condenser was added to the reactor. 200mL of deionized water was added, followed by a 0.15mol / L NaOH solution dropwise to adjust the pH of the deionized water to 8. Ethylene gas was introduced into the reactor to displace all air. 15g of N-vinylcarbazole, 4g of polyvinyl alcohol (dispersant), 0.2g of azobisisobutyronitrile (initiator), and 0.2g of sodium stearate (emulsifier) were added and mixed to obtain the reactants. The reactor was heated to 90°C and polymerization was carried out at this temperature for 5 hours to obtain the intermediate. 12g of the esterified product was then added to the reactor and the reaction continued at 90°C for 3 hours to obtain the product. The solid product was filtered, and the deionized water solvent was removed by vacuum distillation to synthesize the modified polyester.

[0045] A3. Mix silicon powder and whisker silicon (using whisker silicon with a particle size of 3 μm) in a mass ratio of 1:1 and grind to 220 mesh to obtain a mixed inorganic powder. According to parts by weight, 75 parts of high-density polyethylene, 2 parts of triallyl isocyanurate, 0.8 parts of antioxidant 1076, 3 parts of mixed inorganic powder and 8 parts of modified polyester are mixed to obtain a mixture. The mixture is added to the middle of the double rollers of a plasticizer for melt plasticization at a temperature of 170°C and a melt plasticization time of 8 minutes to obtain a plasticized mixture. The plasticized mixture is added to a flat vulcanizer for compression molding. The temperature of the flat vulcanizer is set to 175°C and the compression molding time is 10 minutes to synthesize the modified sheath material.

[0046] Example 3

[0047] This embodiment provides a method for preparing a modified sheath material for an infrastructure high-efficiency power transmission optical cable, comprising the following steps:

[0048] A1. Add 14 g of 2,5-furandicarboxylic acid and 2.6 g of hydroxyethyl methacrylate to a 250 mL three-necked flask equipped with a stirring device and a spherical condenser. Mix thoroughly and allow an esterification reaction to proceed to obtain a reactant. The esterification reaction is carried out at 200°C until the distillation of the byproduct water exceeds 95%, which indicates the completion of the esterification reaction.

[0049] A2: A 500mL reactor equipped with a stirrer, thermometer, and condenser was added to the reactor. 200mL of deionized water was added, followed by a 0.2mol / L NaOH solution dropwise to adjust the pH of the deionized water to 9. Ethylene gas was introduced into the reactor to displace all air. 18g of N-vinylcarbazole, 5g of polyvinyl alcohol (dispersant), 0.3g of azobisisobutyronitrile (initiator), and 0.25g of sodium stearate (emulsifier) were added and mixed to obtain the reactants. The reactor was heated to 100°C and polymerization was carried out at this temperature for 6 hours to obtain the intermediate. 15g of the esterified product was then added to the reactor and the reaction continued at 100°C for another 4 hours to obtain the product. The solid product was filtered, and the deionized water solvent was removed by vacuum distillation to synthesize the modified polyester.

[0050] A3. Mix silicon powder and whisker silicon (using whisker silicon with a particle size of 1 μm) in a mass ratio of 1:1 and grind to 300 mesh to obtain a mixed inorganic powder. According to parts by weight, 80 parts of high-density polyethylene, 2 parts of trimethylolpropane triacrylate, 1 part of antioxidant 264, 5 parts of mixed inorganic powder and 12 parts of modified polyester are mixed to obtain a mixture. The mixture is added to the middle of the double rollers of the plasticizer for melt plasticization at a temperature of 175°C and a melt plasticization time of 10 minutes to obtain a plasticized mixture. The plasticized mixture is added to a flat vulcanizer for compression molding. The temperature of the flat vulcanizer is set to 180°C and the compression molding time is 15 minutes to synthesize the modified sheath material.

[0051] Example 4

[0052] This embodiment provides a method for preparing a paste for an infrastructure high-efficiency power transmission optical cable, comprising the following steps:

[0053] B1. Blend 30 g of lignin and 10 g of glycidol, in parts by weight, to obtain a blend. Add 2 g of diethylenetriamine, a curing agent, to the blend and mix thoroughly to obtain a mixture. Pour the mixture into a preheated mold and cure in a forced convection oven at 90°C for 2 hours to produce a water-absorbing flame-retardant material.

[0054] B2. According to parts by weight, 70 parts of silicone oil, 5 parts of gelling agent sodium stearate, 3 parts of water-absorbing flame retardant material and 3 parts of antioxidant tert-butylhydroquinone were mixed to prepare a paste.

[0055] Example 5

[0056] This embodiment provides a method for preparing a paste for an infrastructure high-efficiency power transmission optical cable, comprising the following steps:

[0057] B1. Blend 40 parts by weight of lignin and 15 parts of glycidol to obtain a blend. Add 2.5 g of a curing agent, diethylenetriamine, to the blend and mix thoroughly to obtain a mixture. Pour the mixture into a preheated mold and cure in a forced convection oven at 100°C for 1.5 hours to prepare a water-absorbing flame-retardant material.

[0058] B2. According to parts by weight, 75 parts of silicone oil, 8 parts of gelling agent potassium stearate, 8 parts of water-absorbing flame retardant material and 4 parts of antioxidant tert-butylhydroquinone were mixed to prepare a paste.

[0059] Example 6

[0060] This embodiment provides a method for preparing a paste for an infrastructure high-efficiency power transmission optical cable, comprising the following steps:

[0061] B1. Blend 50 parts by weight of lignin and 20 parts by weight of glycidol to obtain a blend. Add 3 g of diethylenetriamine (a curing agent) to the blend and mix thoroughly to obtain a mixture. Pour the mixture into a preheated mold and cure in a forced convection oven at 110°C for 1 hour to produce a water-absorbing flame-retardant material.

[0062] B2. According to parts by weight, 80 parts of silicone oil, 10 parts of fatty acid magnesium as a gelling agent, 12 parts of water-absorbing flame retardant material and 5 parts of antioxidant tert-butylhydroquinone were mixed to prepare a paste.

[0063] Example 7

[0064] This embodiment provides a process for manufacturing an infrastructure high-efficiency power transmission optical cable, comprising the following steps:

[0065] S1. The infrastructure high-efficiency power transmission optical cable prepared by the present invention uses a reinforcing core as the center of the circle, and the diameter of the reinforcing core is 0.4 mm; an aluminum tube is coated with an optical fiber to form an optical unit, and the diameter of the aluminum tube is 2 mm and the wall thickness is 0.4 mm; an SZ optical cable stranding machine is used to SZ-twisted the optical unit and the steel wire intervals; during the stranding process, an SZ differential structure is adopted, and a multi-lead head and a forming head are combined, and PLC logic operation synchronously controls the reversing speed and stranding speed, and the stranding speed is 500 r / min.

[0066] S2. The paste prepared in Example 1 is filled inside the optical cable using thermoplastic material liquid extrusion curing molding technology. The paste filling amount is 5% of the total weight of the power optical cable, and the extrusion temperature is 150°C. The modified sheath material prepared in Example 4 is set on the inner surface of the optical cable. The thickness of the outer sheath is 2 mm. After the cable is formed, an infrastructure high-efficiency transmission power optical cable is prepared.

[0067] Example 8

[0068] This embodiment provides a process for manufacturing an infrastructure high-efficiency power transmission optical cable, comprising the following steps:

[0069] S1. The infrastructure high-efficiency power transmission optical cable prepared by the present invention uses a reinforcing core as the center of the circle, and the diameter of the reinforcing core is 0.4 mm; an aluminum tube is coated with an optical fiber to form an optical unit, and the diameter of the aluminum tube is 2 mm and the wall thickness is 0.4 mm; an SZ optical cable stranding machine is used to SZ-twisted the optical unit and the steel wire intervals; during the stranding process, an SZ differential structure is adopted, and a multi-lead head and a forming head are combined, and PLC logic operation synchronously controls the reversing speed and stranding speed, and the stranding speed is 550 r / min.

[0070] S2. The paste prepared in Example 2 is filled inside the optical cable using thermoplastic material liquid extrusion curing molding technology, and the extrusion temperature is 180°C; the modified sheath material prepared in Example 5 is set on the inner surface of the optical cable, and the thickness of the outer sheath is 2 mm. After the cable is formed, an infrastructure high-efficiency power transmission optical cable is prepared.

[0071] Example 9

[0072] This embodiment provides a process for manufacturing an infrastructure high-efficiency power transmission optical cable, comprising the following steps:

[0073] S1. The infrastructure high-efficiency power transmission optical cable prepared by the present invention uses a reinforcing core as the center of the circle, and the diameter of the reinforcing core is 0.5 mm; the aluminum tube is coated with the optical fiber to form an optical unit, and the diameter of the aluminum tube is 3 mm and the wall thickness is 0.5 mm; an SZ optical cable stranding machine is used to SZ-twisted the optical unit and the steel wire intervals; during the stranding process, an SZ differential structure is adopted, and a multi-lead head and a forming head are combined, and PLC logic operation synchronously controls the reversing speed and stranding speed, and the stranding speed is 600 r / min.

[0074] S2. The paste prepared in Example 3 is filled inside the optical cable using thermoplastic material liquid extrusion curing molding technology. The paste filling amount is 6% of the total weight of the power optical cable, and the extrusion temperature is 200°C. The modified sheath material prepared in Example 6 is set on the inner surface of the optical cable. The thickness of the outer sheath is 3 mm. After the cable is formed, an infrastructure high-efficiency transmission power optical cable is prepared.

[0075] Comparative Example 1

[0076] Compared with Example 9, the present invention uses lignin of equal mass to replace the water-absorbing flame-retardant material when preparing the paste.

[0077] Comparative Example 2

[0078] Compared with Example 9, the present invention uses an ester of equal mass to replace the modified polyester when preparing the modified sheath material.

[0079] Comparative Example 3

[0080] Compared with Example 9, in the present invention, when preparing the modified sheath material, hydroxyethyl methacrylate and N-vinylcarbazole undergo addition polymerization in a molar ratio of 1:1 to synthesize the modified polyester.

[0081] Comparative Example 4

[0082] Compared with Example 9, the present invention does not add inorganic mixed powder when preparing the modified sheath material.

[0083] Performance testing:

[0084] 1. The infrastructure high-efficiency power transmission cable materials prepared in Examples 7-9 and Comparative Examples 1-3 were cut into sample sizes of 80 mm × 10 mm × 4 mm with a notch width of 2 mm. The notched impact strength of the samples was tested in turn using an Izod impact tester at room temperature according to ISO 180.

[0085] 2. In accordance with ISO 572, the high-efficiency power transmission cable materials for infrastructure construction prepared in Examples 7-9 and Comparative Examples 1-3 were injection molded into standard dumbbell-shaped specimens and then subjected to tensile testing at a rate of 50 mm / min using a universal testing machine. The support beams, obtained by injection molding according to ISO 178, had a support span of 64 mm and were 32 mm to the left and right of the indenter. Bending performance testing was performed at a rate of 5 mm / min.

[0086] 3. The high-efficiency infrastructure transmission power cable materials prepared in Examples 7-9 and Comparative Examples 1-3 were tested using a thermogravimetric analyzer; 10 mg of the sample was added to a crucible, and the temperature was increased at a heating rate of 10°C / min under a nitrogen atmosphere, and the temperature at which the mass loss was 50% wt was recorded.

[0087] 4. In accordance with GB / T 2918-1996, the high-efficiency power transmission optical cables prepared in Examples 7-9 were cut into 13 mm × 120 mm × 3 mm strips. Flame retardancy testing was performed on a vertical combustion apparatus at a temperature of 25°C and a relative humidity of 50%. Each set of samples was tested five times to determine their flame retardancy level.

[0088] 5. Using distilled water as the test liquid, cut the high-efficiency power transmission optical cables for infrastructure construction prepared in Examples 7-9 and Comparative Examples 1-3 into 50 mm squares, dry them in a 50°C oven for 24 hours, cool them to room temperature, and weigh them (m1). Sequentially, place the samples in a container filled with distilled water and soak them for 24 hours. Remove the samples, wipe off the surface moisture, and weigh them (m2). Calculate the water absorption rate.

[0089] W (water absorption) = [(m2-m1) / m1] × 100%

[0090] The specific test results are shown in the table below:

[0091] Table 1. Sample performance test

[0092]

[0093]

[0094] Data Analysis: Analyzing the data in Table 1, the modified sheath materials prepared in Examples 1-3 of the present invention all have relatively high notched impact strength values. In Comparative Example 4, since no inorganic mixed powder was added when preparing the modified sheath material, its mechanical properties decreased, as evidenced by a significant decrease in the notched impact strength and flexural strength values of the prepared power optical cable material. In Comparative Example 2, when preparing the modified sheath material, an ester of equal mass was used to replace the modified polyester. In Comparative Example 3, hydroxyethyl methacrylate and N-vinylcarbazole were subjected to a polyaddition reaction at a molar ratio of 1:1 to synthesize the modified polyester. Compared to the modified sheath materials prepared in Comparative Examples 2 and 3, the modified polyesters prepared in Examples 1-3 contain more benzene rings and multiple short-chain branching structures, and thus have better mechanical properties and higher notched impact strength values. The modified polyesters prepared in Examples 1-3 have better compatibility with high-density polyethylene, as evidenced by higher flexural strength values and good thermal stability.

[0095] In Comparative Example 1, when preparing a paste, even when lignin of equal mass was substituted for the water-absorbing flame-retardant material, the paste still exhibited good flame retardancy and water absorption, demonstrating that the paste, doped with lignin, improved its water absorption (waterproofing) and flame retardancy. Furthermore, glycidol-cured lignin enhanced the paste's crosslinking, strength, and hardness, resulting in improved notched impact strength, flexural strength, and thermal stability of the cable material after filling the paste.

[0096] The above contents are merely examples and explanations of the structure of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they shall fall within the scope of protection of the present invention.

[0097] Throughout this specification, references to terms such as "one embodiment," "example," and "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0098] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An infrastructure high-efficiency power transmission optical cable, characterized in that: The interior of the infrastructure high-efficiency power transmission optical cable includes a reinforcing core and an optical unit in sequence; wherein the optical unit is formed by an aluminum tube covering an optical fiber, and the interior of the optical cable is filled with a paste; a sheath is provided on the inner surface of the optical cable, wherein the sheath is obtained by melt-extrusion of a modified sheath material.

2. The high-efficiency power transmission optical cable for infrastructure construction according to claim 1, characterized in that: The preparation method of the modified sheath material comprises the following steps: A1, 2,5-furandicarboxylic acid and hydroxyethyl methacrylate are mixed and esterified at 180-200°C until the amount of by-product water distilled out is greater than 95%, which is considered to be the end of the esterification reaction, thereby synthesizing an esterified product; A2. Deionized water is added to a reactor, and a NaOH solution is added dropwise to the deionized water to adjust the pH value of the deionized water to 8-9; ethylene gas is introduced into the reactor to replace the air in the reactor with ethylene gas; N-vinyl carbazole, a dispersant, an initiator, and an emulsifier are then added to the reactor and mixed to obtain a reactant; the reactant is polymerized at 80-100° C. to obtain an intermediate; an esterified product is then added to react to obtain a product; the product is subjected to post-processing to synthesize a modified polyester; A3, high-density polyethylene, ultraviolet crosslinking agent, antioxidant, mixed inorganic powder and modified polyester are mixed to obtain a mixture; the mixture is melt-masticated to obtain a plasticized mixture; the plasticized mixture is vulcanized to synthesize a modified sheath material.

3. The high-efficiency power transmission optical cable for infrastructure construction according to claim 2, characterized in that: In step A1, the amount ratio of 2,5-furandicarboxylic acid and hydroxyethyl methacrylate is 7-14g:1.3-2.6g; in step A2, the dispersant is polyvinyl alcohol, the initiator is azobisisobutyronitrile, and the emulsifier is sodium stearate; the amount ratio of deionized water, N-vinylcarbazole, dispersant, initiator and emulsifier is 200mL:9-18g:3-5g:0.1-0.3g:0.15-2.5g; the polymerization reaction time is 3-6h, and the reaction time of adding the ester is 2-4h; the post-processing step includes: filtering the product solid, then distilling under reduced pressure, and removing deionized water.

4. The high-efficiency power transmission optical cable for infrastructure construction according to claim 2, characterized in that: In step A3, the UV crosslinking agent is any one of triallyl cyanurate, triallyl isocyanurate, and trimethylolpropane triacrylate; the antioxidant is any one of antioxidant 1010, antioxidant 1076, or antioxidant 264; the weight ratio of the high-density polyethylene, UV crosslinking agent, antioxidant, mixed inorganic powder, and modified polyester is 70-80:1-2:0.5-1:1-5:3-12; the melt-masticating temperature is 165-175°C, and the melt-masticating time is 5-10 min; the vulcanization temperature is 170-180°C, and the press molding time is 5-15 min.

5. The high-efficiency power transmission optical cable for infrastructure construction according to claim 1, characterized in that: The preparation method of the paste comprises the following steps: B1. Blending lignin and glycidol to obtain a blend; adding a curing agent to the blend and mixing to obtain a mixture; and curing the mixture to obtain a water-absorbing flame-retardant material; B2. Mix 70-80 parts of silicone oil, 5-10 parts of gelling agent, 3-12 parts of water-absorbing flame retardant material and 3-5 parts of antioxidant in parts by weight to prepare a paste.

6. The high-efficiency power transmission optical cable for infrastructure construction according to claim 5, characterized in that: In step B1, the curing agent is diethylenetriamine, and the usage ratio of lignin, glycidol, and curing agent is 30-50 g:10-20 g:2-3 g; the curing temperature is 90-110° C., and the curing time is 1-2 h; in step B2, the gelling agent is any one of sodium stearate, potassium stearate, or magnesium stearate, and the antioxidant is tert-butylhydroquinone.

7. A processing technology for infrastructure high-efficiency power transmission optical cable according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, the strengthening core is used as the center of the circle; the aluminum tube is covered with the optical fiber to form an optical unit, and the optical unit and the steel wire are SZ-twisted at intervals using an SZ optical cable stranding machine to form the inner part of the optical cable; S2. Use liquid extrusion curing molding technology to fill the paste inside the optical cable at an extrusion temperature of 150-200°C; set a modified sheath material on the inner surface of the optical cable. After the cable is formed, a high-efficiency power transmission optical cable is prepared.

8. The processing technology of the infrastructure high-efficiency power transmission optical cable according to claim 7 is characterized in that: In step S1, the diameter of the reinforcing core is 0.4-0.5mm; the diameter of the aluminum tube is 2-3mm, and the wall thickness is 0.4-0.5mm; the twisting speed is 500-600r / min; in step S2, the paste filling amount is 5-8% of the total weight of the power optical cable, and the outer sheath thickness is 2-3mm.

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