Infrastructure efficient transmission power optical cable and processing technology thereof

Abstract

The application discloses a kind of capital construction efficient transmission power optical cable and its processing technology, belong to cable processing technical field, to solve the technical problems in the prior art, such as the flame retardance and waterproofness of the filling paste of the prepared power optical cable material need to be improved;The impact resistance and other mechanical properties of the prepared power cable need to be further enhanced.The capital construction efficient transmission power optical cable includes optical cable inside and optical cable outside;Optical cable inside includes reinforcing core and light unit, and optical cable inside is filled with paste;Optical cable outside is provided with sheath, and the sheath is obtained by melt extrusion of modified sheath material.The modified sheath material includes high-density polyethylene, modified polyester and the like;Modified polyester is obtained by reaction of intermediate and esterification product.The paste is composed of silicone oil, water-absorbing flame-retardant material and the like.The power optical cable prepared by the application has the advantages of high mechanical strength, flame retardance and waterproofness.

Description

TECHNICAL FIELD

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

[0002] The new power optical cable relies on the high-voltage line resource layout distributed in a wide area to provide data transmission for the power communication network. Since the 5G base station construction and the B5G base station construction to be fully landed in the near future are located in remote areas or countries and regions with complex climate environments, these base station constructions require the power optical cable as a transmission line to improve the environmental inertia, adaptability and precise transmission force. How to improve the cable material components and thereby improve the mechanical properties, flame retardant properties and other related properties of the power optical cable, and thereby improve the response to complex environments and the durability of the prepared power optical cable are technical problems to be solved.

[0003] In addition, in order to eliminate the influence of air humidity and moisture and other external forces on the optical fiber, it is necessary to add a paste during the manufacturing process of the optical fiber cable to play the role of waterproofing, moisture-proofing, buffering and lubrication, thereby ensuring the high stability and high reliability of optical fiber communication. Patent application CN1280387C discloses a communication optical cable filling oil paste; the oil paste includes rubber oil, refrigerant oil, ethylene-propylene rubber, polyethylene, polypropylene and related additives; the water blocking agent is an expanded powder. However, the compatibility of the above components is not high, and the mechanical properties such as impact resistance of the cable material filled with the above oil paste cannot be guaranteed.

[0004] In view of the above technical defects, a solution is proposed. SUMMARY

[0005] The present application relates to the technical field of cable processing, in particular to a high-efficiency transmission power optical cable for infrastructure and a processing technology thereof.

[0006] The purpose of the present application can be achieved by the following technical solutions:

[0007] A high-efficiency transmission power optical cable for infrastructure, the inside of the high-efficiency transmission power optical cable comprises 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 inside of the optical cable is filled with a paste; the inside surface of the optical cable is provided with a sheath, wherein the sheath is obtained by melt extrusion of a modified sheath material.

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

[0009] A1, 2,5-furan dicarboxylic acid and hydroxyethyl methacrylate are mixed, esterification reaction occurs at 180-200°C until the distillation amount of by-product water is greater than 95%, which is considered as the end of esterification reaction, and esterification product is synthesized;

[0010] Through esterification reaction, 2,5-furan dicarboxylic acid and hydroxyethyl methacrylate are reacted to synthesize esterification product, and the reaction formula is as follows:

[0011]

[0012] A2, deionized water is added into the reaction kettle, NaOH solution is added dropwise into the deionized water, and the pH value of the deionized water is adjusted to 8-9; ethylene gas is introduced into the reaction kettle to replace the air in the reaction kettle; N-vinyl carbazole, dispersant, initiator and emulsifier are added into the reaction kettle, mixed, and a reactant is obtained; the reactant is subjected to polymerization reaction at 80-100°C to obtain an intermediate; the esterification product is continuously added to react to obtain a product; and the product is subjected to post-process treatment to synthesize a modified polyester;

[0013] The reaction formula of the nucleophilic addition of N-vinyl carbazole and ethylene to obtain the intermediate is as follows:

[0014]

[0015] N-vinyl carbazole and ethylene are reacted in the presence of deionized water as a solvent and related additives to synthesize the intermediate; the synthesized intermediate is continuously reacted with the esterification product to synthesize the modified polyester, and 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 plasticized to obtain a plasticized mixture; and the plasticized mixture is vulcanized to synthesize a modified sheath material.

[0018] Further, in step A1, the amount ratio of 2,5-furan dicarboxylic acid and hydroxyethyl methacrylate is 7-14 g:1.3-2.6 g; 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, emulsifier is 200 mL:9-18 g:3-5 g:0.1-0.3 g:0.15-2.5 g; the polymerization reaction time is 3-6 h, and the reaction time of adding the esterification product is 2-4 h; and the post-process treatment step includes: filtering the product to obtain a solid, and then performing vacuum distillation to remove deionized water to synthesize a modified polyester.

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

[0020] Further, 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 uniformly mixing to obtain a mixture; curing the mixture to prepare a water-absorbing flame-retardant material;

[0022] B2, uniformly mixing 70-80 parts of silicone oil, 5-10 parts of a gelling agent fatty acid salt, 3-12 parts of the water-absorbing flame-retardant material and 3-5 parts of an antioxidant to prepare a paste.

[0023] Further, in step B1, the curing agent is diethylenetriamine, and the ratio of lignin, glycidol and the curing agent is 30-50:10-20:2-3 g; the curing temperature is 90-110 DEG 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-butyl hydroquinone.

[0024] As another aspect of the present application, a processing process of a capital construction efficient power transmission optical cable comprises the following steps:

[0025] S1, taking the reinforcing core as the center; wrapping the optical fiber with an aluminum tube to form an optical unit, and using an SZ optical cable stranding machine to SZ-strand the optical unit and the steel wire to form the inside of the optical cable;

[0026] S2, filling the paste in the inside of the optical cable by using a liquid extrusion curing forming technology, the extrusion temperature is 150-200 DEG C; arranging a modified sheath material on the inside surface of the optical cable, and after cabling, an efficient power transmission optical cable is prepared.

[0027] Further, 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 stranding speed is 500-600 r / min; in step S2, the filling amount of the paste is 5-8% of the total weight of the power transmission 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 power optical cable prepared by this invention uses a reinforcing core as the center, with aluminum tubes covering optical fibers as optical units. Multiple optical units are placed discretely within a single tube. The optical units are stranded with steel wires at SZ intervals. During the stranding process, the stranding equipment is modified to adopt an SZ differential structure. PLC logic operations generate interactive signals to control the forward and reverse operation of the motor, thereby synchronously controlling the commutation speed and stranding speed. This invention uses an eccentric design and SZ stranding, which can reduce the load on the core unit of the power optical cable, enhance mechanical properties, and improve the durability of the power optical cable. The tube is filled with a paste to ensure that the optical fibers have creep space without affecting each other. The paste is filled using a thermoplastic liquid extrusion curing molding technology, which can significantly increase the density of the tube. The outer sheath is prepared by melt extrusion of a modified sheath material.

[0030] 2. The power optical cable internal filling paste prepared by this invention incorporates an appropriate amount of water-absorbing and flame-retardant material into the basic silicone oil component. Lignin itself has strong hygroscopic properties, thereby improving its waterproof performance; in addition, lignin has high flame retardancy. Lignin and glycidyl ether are cured and reacted at high temperature to synthesize a water-absorbing and flame-retardant material; glycidyl ether can react with the curing agent to form a cross-linked structure, enhancing the strength and hardness of the filling paste.

[0031] 3. The modified sheath material for power cables prepared by this invention features an outer sheath structure. The outer sheath material uses high-density polyethylene as the base material, with modified polyester added to toughen and improve its impact resistance. Furthermore, the synthesized modified polyester possesses high insulation properties, and its doping into the prepared sheath material enhances the dielectric properties of the cable. The modified sheath material can be prepared by melt plasticizing and vulcanizing the modified polyester with high-density polyethylene. The modified polyester not only further increases the density and mechanical properties of the prepared modified sheath material but also avoids the significant polarity difference between high-density polyethylene and polyester, reducing the formation of a two-phase structure, thereby enhancing the interfacial bonding force between the two components and improving its mechanical properties. An appropriate amount of mixed inorganic powder is added to the above modified sheath material. The mixed inorganic powder is obtained by mixing and grinding silicon powder and whisker silicon. The mixed inorganic powder can mitigate the limitations of the target product in extremely cold environments, improve the durability of the prepared power optical cable, lower the freezing point, and simultaneously increase the bending strength of the optical cable. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a structural diagram of the high-efficiency power transmission optical cable for infrastructure prepared according to the present invention. Detailed Implementation

[0034] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] The silicon powder used in Examples 1-3 of this invention was purchased from Shanghai Pantian Powder Materials Co., Ltd., with product number PT-Si-30nm, an average particle size of 30nm, and a specific surface area of ​​98m². 2 / g, with a bulk density of 0.05g / cm³ 3 The whisker silicon used in Examples 1-3 of this invention was purchased from Shanghai Huijing Asia Nanomaterials Co., Ltd., with a particle size of 1-5 μm and a bulk density of 0.65 g / cm³. 3 The Mohs hardness is 7; the high-density polyethylene used in Examples 1-3 of this invention was purchased from Shanghai Yanxing Plastics Co., Ltd., with item number 1508S; the silicone oil used in Examples 4-6 of this invention was purchased from Jiashan Jiangnan Textile Materials Co., Ltd., with item number 201.

[0036] Example 1

[0037] This embodiment provides a method for preparing a modified sheath material for high-efficiency power optical cables used in infrastructure construction, including the following steps:

[0038] A1. A 250mL three-necked flask is equipped with a stirrer and a spherical condenser. 7g of 2,5-furandicarboxylic acid and 1.3g of hydroxyethyl methacrylate are added to the three-necked flask, mixed well, and subjected to esterification reaction to obtain the reactants. The esterification reaction is carried out at 180℃ until the amount of water distilled out as a byproduct is greater than 95%, which is considered the end of the esterification reaction and the synthesis of the esterified product.

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

[0040] A3. Silicon powder and whisker silicon (using whisker silicon with a particle size of 5μm) are mixed at a mass ratio of 1:1 and ground to 200 mesh to obtain a mixed inorganic powder. By weight, 70 parts of high-density polyethylene, 1 part of triallyl cyanurate, 0.5 parts of antioxidant 1010, 1 part of the mixed inorganic powder, and 3 parts of modified polyester are mixed to obtain a mixture. The mixture is added to the double-roller of a plasticizer for melt plasticizing at a temperature of 165℃ for 5 minutes to obtain a plasticized mixture. The plasticized mixture is then added to a flat vulcanizing machine for pressing and molding at a temperature of 170℃ for 5 minutes to synthesize a modified sheath material.

[0041] Example 2

[0042] This embodiment provides a method for preparing a modified sheath material for high-efficiency power optical cables used in infrastructure construction, including the following steps:

[0043] A1. A 250mL three-necked flask is equipped with a stirrer and a spherical condenser. 10g of 2,5-furandicarboxylic acid and 1.9g of hydroxyethyl methacrylate are added to the three-necked flask, mixed well, and subjected to esterification reaction to obtain the reactants. The esterification reaction is carried out at 190℃ until the amount of water distilled out as a byproduct is greater than 95%, which is considered the end of the esterification reaction and the synthesis of the esterified product.

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

[0045] A3. Silicon powder and whisker silicon (using whisker silicon with a particle size of 3μm) are mixed at a mass ratio of 1:1 and ground to 220 mesh to obtain a mixed inorganic powder. By weight, 75 parts high-density polyethylene, 2 parts triallyl isocyanate urate, 0.8 parts antioxidant 1076, 3 parts mixed inorganic powder, and 8 parts modified polyester are mixed to obtain a mixture. The mixture is added to the intermediate rollers of a plasticizer for melt plasticizing at a temperature of 170℃ for 8 minutes to obtain a plasticized mixture. The plasticized mixture is then added to a flat vulcanizing machine for pressing and molding at a temperature of 175℃ for 10 minutes to synthesize a modified sheath material.

[0046] Example 3

[0047] This embodiment provides a method for preparing a modified sheath material for high-efficiency power optical cables used in infrastructure construction, including the following steps:

[0048] A1. A 250mL three-necked flask is equipped with a stirrer and a spherical condenser. 14g of 2,5-furandicarboxylic acid and 2.6g of hydroxyethyl methacrylate are added to the three-necked flask, mixed well, and subjected to esterification reaction to obtain the reactants. The esterification reaction is carried out at 200℃ until the amount of water distilled out as a byproduct is greater than 95%, which is considered the end of the esterification reaction and the synthesis of the esterified product.

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

[0050] A3. Silicon powder and whisker silicon (using whisker silicon with a particle size of 1μm) are mixed at a mass ratio of 1:1 and ground to 300 mesh to obtain a mixed inorganic powder. By weight, 80 parts high-density polyethylene, 2 parts trimethylolpropane triacrylate, 1 part antioxidant 264, 5 parts mixed inorganic powder, and 12 parts modified polyester are mixed to obtain a mixture. The mixture is added to the intermediate rollers of a plasticizer for melt plasticizing at a temperature of 175℃ for 10 minutes to obtain a plasticized mixture. The plasticized mixture is then added to a flat vulcanizing machine for pressing and molding at a temperature of 180℃ for 15 minutes to synthesize a modified sheath material.

[0051] Example 4

[0052] This embodiment provides a method for preparing a paste for high-efficiency power optical cables used in infrastructure construction, including the following steps:

[0053] B1. By weight, 30g of lignin and 10g of glycidyl ether are blended to obtain a blend. 2g of diethylenetriamine, a curing agent, is added to the blend and mixed thoroughly to obtain a mixture. The mixture is poured into a preheated mold and cured in a forced convection oven at 90℃ for 2 hours to prepare a water-absorbing and flame-retardant material.

[0054] B2. According to the 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 are mixed evenly to prepare a paste.

[0055] Example 5

[0056] This embodiment provides a method for preparing a paste for high-efficiency power optical cables used in infrastructure construction, including the following steps:

[0057] B1. By weight, 40 parts of lignin and 15 parts of glycidyl ether are blended to obtain a blend. 2.5g of diethylenetriamine, a curing agent, is added to the blend and mixed thoroughly to obtain a mixture. The mixture is poured into a preheated mold and cured in a forced convection oven at 100℃ for 1.5 hours to prepare a water-absorbing and flame-retardant material.

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

[0059] Example 6

[0060] This embodiment provides a method for preparing a paste for high-efficiency power optical cables used in infrastructure construction, including the following steps:

[0061] B1. By weight, 50 parts of lignin and 20 parts of glycidyl ether are blended to obtain a blend. 3g of diethylenetriamine curing agent is added to the blend and mixed thoroughly to obtain a mixture. The mixture is poured into a preheated mold and cured in a forced convection oven at 110℃ for 1 hour to prepare a water-absorbing and flame-retardant material.

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

[0063] Example 7

[0064] This embodiment provides a processing technology for high-efficiency power optical cables for infrastructure construction, including the following steps:

[0065] S1. The high-efficiency power transmission optical cable for infrastructure prepared by this invention uses a reinforcing core as the center, with a diameter of 0.4 mm; an aluminum tube is used to cover optical fibers to form optical units, with a diameter of 2 mm and a wall thickness of 0.4 mm; an SZ optical cable stranding machine is used to strand the optical units and steel wires at SZ intervals; during the stranding process, an SZ differential structure is used, and multiple guide heads and forming heads are combined, and PLC logic operation synchronously controls the commutation speed and stranding speed, with a stranding speed of 500 r / min.

[0066] S2. The paste prepared in Example 1 is filled inside the optical cable using thermoplastic 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 2mm. After cabling, a high-efficiency power optical cable for infrastructure transmission is obtained.

[0067] Example 8

[0068] This embodiment provides a processing technology for high-efficiency power optical cables for infrastructure construction, including the following steps:

[0069] S1. The high-efficiency power transmission optical cable for infrastructure prepared by this invention uses a reinforcing core as the center, with a diameter of 0.4 mm; an aluminum tube is used to cover optical fibers to form optical units, with a diameter of 2 mm and a wall thickness of 0.4 mm; an SZ optical cable stranding machine is used to strand the optical units and steel wires at SZ intervals; during the stranding process, an SZ differential structure is used, and multiple guide heads and forming heads are combined, and PLC logic operation synchronously controls the commutation speed and stranding speed, with a stranding speed of 550 r / min.

[0070] S2. The paste prepared in Example 2 is filled inside the optical cable using liquid extrusion curing molding technology for thermoplastic materials, 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 2mm. After the cable is formed, a high-efficiency power transmission optical cable for infrastructure is obtained.

[0071] Example 9

[0072] This embodiment provides a processing technology for high-efficiency power optical cables for infrastructure construction, including the following steps:

[0073] S1. The high-efficiency power transmission optical cable for infrastructure prepared by this invention uses a reinforcing core as the center, with a diameter of 0.5mm; an aluminum tube is used to cover optical fibers to form optical units, with a diameter of 3mm and a wall thickness of 0.5mm; an SZ optical cable stranding machine is used to strand the optical units and steel wires at SZ intervals; during the stranding process, an SZ differential structure is used, and multiple guide heads and forming heads are combined, and PLC logic operation synchronously controls the commutation speed and stranding speed, with a stranding speed of 600r / min.

[0074] S2. The paste prepared in Example 3 is filled inside the optical cable using a thermoplastic 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℃. The modified sheath material prepared in Example 6 is applied to the inner surface of the optical cable, and the outer sheath thickness is 3mm. After cabling, a high-efficiency power optical cable for infrastructure transmission is obtained. 。

[0075] Comparative Example 1

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

[0077] Comparative Example 2

[0078] Compared to Example 9, in this invention, when preparing the modified sheath material, the same mass of esterified material is used instead of modified polyester.

[0079] Comparative Example 3

[0080] Compared to Example 9, in the preparation of the modified sheath material, hydroxyethyl methacrylate and N-vinylcarbazole undergo an addition polymerization reaction at a molar ratio of 1:1 to synthesize a modified polyester.

[0081] Comparative Example 4

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

[0083] Performance testing:

[0084] 1. The high-efficiency power transmission optical cable materials prepared in Examples 7-9 and Comparative Examples 1-3 were cut into specimens with a size of 80mm×10mm×4mm and a notch width of 2mm. The notch impact strength of the specimens was tested sequentially at room temperature using a cantilever beam impact testing machine in accordance with ISO180 standard.

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

[0086] 3. The high-efficiency power transmission optical 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 the crucible and heated at a rate of 10 °C / min under a nitrogen atmosphere. The temperature value when the mass loss was 50% wt was recorded.

[0087] 4. According to GB / T2918-1996, the high-efficiency power transmission optical cables prepared in Examples 7-9 were cut into strips of 13mm×120mm×3mm. Flame retardancy performance was tested on a vertical combustion tester at a temperature of 25℃ and a relative humidity of 50%. Each group of samples was tested five times to determine its flame retardancy rating.

[0088] 5. Distilled water was used as the test solution. The high-efficiency power transmission optical cables prepared in Examples 7-9 and Comparative Examples 1-3 were cut into squares with a side length of 50 mm, dried in an oven at 50 °C for 24 h, cooled to room temperature, and weighed as m1. The samples were then placed in containers filled with distilled water and soaked for 24 h. The samples were then removed, the surface moisture was wiped off, and the weight was recorded as m2. The water absorption rate was calculated.

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

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

[0091] Table 1. Sample Performance Testing

[0092]

[0093]

[0094] Data Analysis: Analysis of the data in Table 1 shows that the modified sheath materials prepared in Examples 1-3 of this invention all exhibit high notched impact strength values. In Comparative Example 4, because no inorganic mixed powder was added during the preparation of the modified sheath material, its mechanical properties decreased, manifested in a significant decrease in the notched impact strength and flexural strength values ​​of the prepared power optical cable material. In Comparative Example 2, an equal mass of esterified material was used to replace the modified polyester during the preparation of the modified sheath material. In Comparative Example 3, hydroxyethyl methacrylate and N-vinylcarbazole underwent an addition polymerization 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 polyester prepared in Examples 1-3 contains more benzene rings and multiple short-branched structures, resulting in better mechanical properties and higher notched impact strength values. The modified polyester prepared in Examples 1-3 also exhibits better compatibility with high-density polyethylene, demonstrating higher flexural strength and better thermal stability.

[0095] In Comparative Example 1, when the same mass of lignin was used to replace the water-absorbing and flame-retardant material during the preparation of the paste, it still exhibited good flame-retardant properties and water absorption rate. This indicates that the prepared paste improved its water absorption rate (waterproof performance) and flame-retardant properties by incorporating lignin. Furthermore, lignin cured with glycidyl ether enhanced the cross-linking degree, strength, and hardness of the prepared paste, resulting in better notched impact strength, flexural strength, and thermal stability of the cable material after filling with the paste.

[0096] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

[0097] In the description of this specification, references to terms such as "an embodiment," "example," and "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above 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 one or more embodiments or examples.

[0098] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A high-efficiency power transmission optical cable for infrastructure, characterized in that, The internal structure of the high-efficiency power transmission optical cable for infrastructure includes a reinforcing core and an optical unit; wherein, the optical unit is formed by aluminum tube covering optical fiber, and the inside of the optical cable is filled with paste; a sheath is provided on the inner surface of the optical cable, wherein the sheath is obtained by melt extrusion of modified sheath material; The preparation method of the modified sheath material includes the following steps: A1, 2,5-furandicarboxylic acid and hydroxyethyl methacrylate are mixed and esterified at 180-200℃ until the amount of water distilled out as a byproduct is greater than 95%, at which point the esterification reaction is considered to be complete and the esterified product is synthesized. A2. Deionized water is added to the reactor, and NaOH solution is added dropwise to adjust the pH of the deionized water to 8-9. Ethylene gas is introduced into the reactor to replace the air inside. Then, N-vinylcarbazole, dispersant, initiator, and emulsifier are added to the reactor and mixed to obtain the reactants. The reactants are polymerized at 80-100℃ to obtain intermediates. Then, esters are added to continue the reaction to obtain the product. The product is then processed to synthesize modified polyester. A3. High-density polyethylene, UV crosslinking agent, antioxidant, mixed inorganic powder and modified polyester are mixed to obtain a mixture; the mixture is melt-plasticized to obtain a plasticized mixture; the plasticized mixture is vulcanized to synthesize a modified sheath material; The method for preparing the ointment includes the following steps: B1. Blend lignin and glycidyl ether to obtain a blend; add a curing agent to the blend and mix well to obtain a mixture; cure the mixture to prepare a water-absorbing and flame-retardant material; B2. By weight, 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 to prepare a paste.

2. The high-efficiency power transmission optical cable for infrastructure as described in claim 1, characterized in that, In step A1, the ratio of 2,5-furandicarboxylic acid to 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 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 after adding the esterified product is 2-4h; the post-processing steps include: filtering the product to remove solids, followed by vacuum distillation to remove deionized water.

3. The high-efficiency power transmission optical cable for infrastructure as described in claim 1, characterized in that, In step A3, the UV crosslinking agent is any one of triallyl cyanurate, triallyl isocyanate, and trimethylolpropane triacrylate; the antioxidant is any one of antioxidant 1010, antioxidant 1076, or antioxidant 264; the weight ratio of 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 plasticizing temperature is 165-175℃, and the melt plasticizing time is 5-10 min; the vulcanization temperature is 170-180℃, and the compression molding time is 5-15 min.

4. The high-efficiency power transmission optical cable for infrastructure as described in claim 1, characterized in that, In step B1, the curing agent is diethylenetriamine, and the ratio of lignin, glycidyl ether, and curing agent is 30-50g:10-20g:2-3g; the curing temperature is 90-110℃, 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.

5. A processing technology for a high-efficiency power transmission optical cable for infrastructure as described in any one of claims 1-4, characterized in that, Includes the following steps: S1, with the reinforcing core as the center; the optical fiber is covered by an aluminum tube to form an optical unit, and the optical unit and the steel wire are twisted together at intervals of SZ using an SZ optical cable twisting machine to form the inside of the optical cable; S2. A paste is filled inside the optical cable using liquid extrusion curing molding technology, with an extrusion temperature of 150-200℃; a modified sheath material is set on the inner surface of the optical cable, and after cabling, a high-efficiency power transmission optical cable is prepared.

6. The processing technology of the high-efficiency power optical cable for infrastructure construction according to claim 5, 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 stranding 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 sheath thickness is 2-3mm.

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