A stainless steel belt welded pipe armored rat-proof optical cable and a manufacturing method thereof

Abstract

The present application relates to the technical field of optical cable, in particular to a kind of stainless steel strip welded pipe armoring rat-proof optical cable and its manufacturing method.A kind of stainless steel strip welded pipe armoring rat-proof optical cable manufacturing method, comprising: preparing colored optical fiber;Preparation stainless steel strip welded pipe layer;Preparation armored steel wire layer;Preparation sheath layer.The present application is first by using hydrochloric acid to the attapulgite is acid treated, increases surface active site, then is calcined, makes its pore structure more stable, then the pretreated attapulgite after calcination is added in the solution of sucrose octaacetate in acetone, makes sucrose octaacetate be loaded in the inner surface and pore of attapulgite, obtains composite rat-proof agent, after it is fused extruded to be made into sheath layer material with polyethylene etc., it can make sheath layer material have better rat-proof effect, simultaneously by physical adsorption, sucrose octaacetate is fixed in pore, can make sucrose octaacetate slowly release, thereby prolongs the rat-proof time limit of sheath layer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical cable, in particular to a stainless steel belt welded pipe armored rat-proof optical cable and a manufacturing method thereof. BACKGROUND

[0002] With the extension of communication networks to complex scenes such as underground pipe galleries, field base stations, rail transit tunnels, etc., as the core carrier of signal transmission, the running stability of optical cables is facing the severe threat of rat gnawing. Rat teeth can easily penetrate the traditional optical cable sheath layer, damage the optical fiber structure, and cause signal interruption. Even if the sheath is damaged, water and impurities will invade, causing the overall optical cable to be scrapped, bringing high costs to the operation and maintenance of the communication system. In particular, in the key fields of power communication and emergency communication, rat-induced optical cable failure can also induce safety accidents, so the rat-proof performance has become one of the core indicators of optical cable design.

[0003] The existing rat-proof optical cable is mainly realized through two technical paths of chemical rat-proofing and physical rat-proofing. The physical rat-proofing scheme is mainly steel wire armored and corrugated steel pipe coated. Although ordinary steel wire armor can improve the impact resistance, the gap between the steel wires is large, and rats can still gnaw through the sheath between the steel wires to cause damage. Although the corrugated steel pipe has good sealing performance, it has the problems of large weight, poor flexibility, high construction difficulty, and loose combination between the steel pipe and the sheath layer, which can cause water to penetrate and cause the steel pipe to rust after long-term use, further reducing the protection effect. The chemical rat-proofing scheme adds natural capsaicin and other rat repellents to the sheath material to repel rats by using irritating odor. Although it is relatively environmentally friendly, it has poor heat resistance and is easy to decompose and lose effectiveness during the high-temperature processing of sheath extrusion. Moreover, it is easy to migrate and volatilize under outdoor light and rainwater, and the rat-proofing life is difficult to guarantee.

[0004] In addition, when the optical cable is laid inside a building, a data center, a subway tunnel, a high-rise shaft, or any place with a large number of people, once a fire occurs, the traditional polyethylene sheath material is flammable, and when it burns, it will produce molten droplets and release a large amount of heat, which will become a "fuse" and "combustion aid" for the spread of fire, seriously hindering personnel evacuation and fire rescue. Moreover, the polyolefin sheath material will cut chemical bonds and cause oxidation reactions when exposed to sunlight for a long time, resulting in powdering, cracking, discoloration, and brittleness on the surface of the sheath material, and the mechanical strength and toughness will decrease sharply. Once the sheath has microscopic cracks due to aging, water and chemical pollutants in the air will enter, not only directly corroding the metal reinforcing member, but more seriously, under temperature changes, these invading water will condense or freeze inside the optical cable, causing irreversible hydrolysis and microbend loss to the optical fiber, resulting in a sharp increase in signal attenuation, and ultimately causing communication interruption.

[0005] Therefore, it is necessary to provide a stainless steel strip-welded pipe armored rat-proof optical cable with fire-retardant and ultraviolet aging resistance and a manufacturing method thereof to prolong the service life. SUMMARY

[0006] In view of the deficiencies in the prior art, the purpose of the present application is to provide a stainless steel strip-welded pipe armored rat-proof optical cable and a manufacturing method thereof.

[0007] The present application provides a stainless steel strip-welded pipe armored rat-proof optical cable, comprising optical fibers, a fiber oil paste layer, a stainless steel strip-welded pipe layer, an armored steel wire layer and a sheath layer arranged in sequence from inside to outside.

[0008] The stainless steel strip-welded pipe layer is formed by butt welding the stainless steel strip with a pipe welding machine, and the stainless steel strip-welded pipe is embossed after welding.

[0009] The sheath layer material is prepared by mixing polyethylene, a composite rat-proof agent, a modified flame retardant, a composite ultraviolet resistant agent, a compatibilizer and a lubricant.

[0010] Further, the preparation steps of the sheath layer material are as follows:

[0011] S1: preparing a composite rat-proof agent

[0012] After pretreating the attapulgite, adding a sucrose octaacetate acetone solution and reacting under nitrogen protection, a composite rat-proof agent is obtained;

[0013] S2: preparing a modified flame retardant

[0014] After dissolving dihydrocapsaicin and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide in toluene and adding an azobisisobutyronitrile solution for reaction, a modified flame retardant is obtained;

[0015] S3: preparing a composite ultraviolet resistant agent

[0016] S3.1: adding a samarium nitrate solution to a cerium nitrate solution according to a volume ratio of 1: (4-5), then adding polyvinylpyrrolidone and fully stirring and mixing to obtain A liquid, and then adding ammonium carbonate to deionized water according to 1g: (5-6)mL, fully stirring and dissolving to obtain B liquid;

[0017] S3.2: while stirring, pour the above B liquid into the A liquid, and continue to stir and react for 1-2h, after filtration, washing, drying and grinding, place it in a muffle furnace and calcine at 650-750℃ for 1-2h to obtain a cerium-samarium nano-composite material;

[0018] S3.3: Disperse the above cerium-samarium nanocomposite material in deionized water at a ratio of 1g:(20-30)mL, add 0.1mol / L sodium hydroxide solution to adjust the pH to 9-10, and then sonicate for 30-40min to obtain a cerium-samarium nanocomposite material dispersion;

[0019] S3.4: Add the layered dihydroxy complex metal hydroxide to formamide at a ratio of 1g:(400-500)mL, sonicate for 12-16h under nitrogen protection, then centrifuge at 3000-4000rpm for 10-15min, collect the supernatant, and obtain a suspension of layered dihydroxy complex metal hydroxide.

[0020] S3.5: While stirring, add the above cerium-samarium nanocomposite dispersion to the above layered dihydroxy composite metal hydroxide suspension, continue stirring for 4-6 hours, let stand and age for 10-12 hours, centrifuge at 9000-10000 rpm for 10-15 minutes, collect the lower precipitate, wash and dry to obtain the composite UV inhibitor;

[0021] S4: Preparation of sheath layer material

[0022] The polyethylene, the above-mentioned composite rodent repellent, the above-mentioned modified flame retardant, the above-mentioned composite UV inhibitor, compatibilizer and lubricant are mixed evenly and then placed in a twin-screw extruder for extrusion granulation to obtain the sheath layer material.

[0023] Furthermore, S1 specifically includes the following steps:

[0024] S1.1: Place attapulgite in a 1 mol / L hydrochloric acid solution at a ratio of 1 g: (10-20) mL, stir for 4-6 h, filter, wash until neutral and dry, then calcine at 300-400℃ for 1-2 h, and after cooling to room temperature, grind and sieve to obtain pretreated attapulgite.

[0025] S1.2: Add sucrose octaacetate to acetone at a ratio of 1g:(20-30)mL, stir thoroughly to dissolve, and then add the pretreated attapulgite clay. Under nitrogen protection, heat and stir at 40-50℃ for 6-8 hours. After cooling, filter, dry and grind to obtain a composite rodent repellent.

[0026] Furthermore, S2 specifically includes the following steps:

[0027] S2.1: Add dihydrocapsaicin and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide to toluene at a ratio of (1.4-1.6)g:1g:(8-10)mL, and stir and mix evenly at 60-70℃ under a nitrogen atmosphere to obtain a mixed reaction solution.

[0028] S2.2: Dissolve azobisisobutyronitrile in toluene at a ratio of 1 g: (400-500) mL to obtain an azobisisobutyronitrile solution. Then add the azobisisobutyronitrile solution to the above mixed reaction solution and continue to stir and react for 46-48 h. After cooling, remove the toluene by vacuum distillation and then separate by column chromatography to obtain the modified flame retardant. The volume ratio of azobisisobutyronitrile solution to the mixed reaction solution is (3.7-3.8):1.

[0029] Furthermore, the mass ratio of pretreated attapulgite to sucrose octaacetic acid ester is (6-8):1.

[0030] Furthermore, the concentrations of both samarium nitrate solution and cerium nitrate solution are 0.2 mol / L, and the solid-liquid ratio of polyvinylpyrrolidone to the total volume of samarium nitrate solution and cerium nitrate solution is 1 g: (480-500) mL.

[0031] Furthermore, the volume ratio of liquid A to liquid B is 1:(1.4-1.6).

[0032] Furthermore, the mass ratio of cerium samarium nanocomposite material in the dispersion to layered dihydroxy composite metal hydroxide in the suspension is 1:(3-5).

[0033] Furthermore, by weight, the raw material composition of the sheath layer material is as follows: 90-100 parts polyethylene, 4-6 parts composite rodent repellent, 14-18 parts modified flame retardant, 2-4 parts composite UV stabilizer, 5-8 parts compatibilizer and 1-2 parts lubricant, wherein the compatibilizer is either PE-g-MAH or POE-g-MAH, and the lubricant is polyethylene wax.

[0034] A method for manufacturing a stainless steel strip welded tube armored rodent-proof optical cable as described in any of the above claims includes the following steps:

[0035] Step 1: Fabrication of colored optical fibers

[0036] Bare optical fibers are colored into colored optical fibers of different colors;

[0037] Step 2: Preparation of stainless steel strip welded pipe layer

[0038] Multiple colored optical fibers are bundled together to form an optical fiber bundle, and then a stainless steel strip is wrapped around the optical fiber bundle. The bundle is then butt-welded by a pipe welding machine to form a stainless steel strip welded pipe layer. At the same time, fiber grease is injected into the stainless steel strip welded pipe for filling, and then embossing is performed.

[0039] Step 3: Prepare the armored steel wire layer

[0040] Galvanized high-carbon steel wire is twisted around a stainless steel strip welded pipe in a "concentric twisting" manner to form an armored steel wire layer;

[0041] Step 4: Prepare the sheath layer

[0042] A stainless steel strip welded tube armored rodent-proof optical cable is obtained by extruding a sheath layer over the armored steel wire layer using an extruder.

[0043] The present invention has the following advantages:

[0044] 1. In this invention, attapulgite is first acid-treated with hydrochloric acid to increase surface active sites, providing anchoring points for subsequent adsorption of sucrose octaacetate. Then, it is calcined to further stabilize its pore structure. The pretreated attapulgite is then added to an acetone solution of sucrose octaacetate and adsorbed under nitrogen protection, allowing sucrose octaacetate to be loaded onto the inner surface and pores of the attapulgite, resulting in a composite rodent repellent. This is then melt-extruded with polyethylene and other materials to form a sheathing material. Because sucrose octaacetate can… It can bind to taste receptors in the mouths of rodents, producing a strong bitter taste and stimulating the oral mucosa of rodents, thereby achieving a good rodent-repellent effect. At the same time, after pretreatment, attapulgite can form a porous structure, which can fix sucrose octaacetate in the pores through physical adsorption, preventing it from becoming ineffective due to volatilization or migration during the processing or use of the sheath material. Moreover, during the long-term use of optical cables, trace amounts of moisture or temperature changes in the environment will trigger the slow release of sucrose octaacetate in the pores of attapulgite, thereby extending the rodent-repellent effect of the sheath layer.

[0045] 2. In this invention, dihydrocapsaicin and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide are added to toluene and reacted under the initiation of azobisisobutyronitrile to obtain a modified flame retardant. This modified flame retardant is then melt-extruded with polyethylene and other materials to form a sheathing material. Since 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is a typical high-efficiency phosphorus-based flame retardant, and the aromatic rings of dihydrocapsaicin are not easily decomposed during combustion, the modified flame retardant is more effective. The modified flame retardant acts as a framework for the carbon layer, making the carbon layer formed by the catalysis of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide more dense and stronger, thereby enhancing the heat insulation and oxygen barrier effects and effectively improving the flame retardant performance of the sheath material. In addition, the modified flame retardant retains the active structure of dihydrocapsaicin, which can stimulate the oral mucosa and digestive tract of rodents, producing a burning sensation. This, combined with the bitterness of the compound rodent repellent, forms a dual stimulation, thereby synergistically enhancing the rodent repellency effect of the sheath.

[0046] 3. In this invention, cerium-smarium nanocomposites are first prepared using samarium nitrate solution and cerium nitrate solution as raw materials. After alkalization, they are added to a layered dihydroxy composite metal hydroxide suspension to form a layered dihydroxy composite metal hydroxide intercalated with cerium-smarium nanocomposites, resulting in a composite UV stabilizer. This stabilizer is then melt-extruded with polyethylene and other materials to form a sheath material. Because cerium oxide in the cerium-smarium nanocomposites can strongly absorb ultraviolet light and quickly capture free radicals generated by the decomposition of the sheath matrix under ultraviolet radiation, it interrupts the aging chain reaction and reduces the degradation rate. Furthermore, the doping of samarium can regulate the energy of cerium oxide. The structure broadens the absorption range and improves UV absorption efficiency, thereby effectively enhancing the UV aging resistance of the sheath layer material. By intercalating the cerium-sammarium nanocomposite material with layered dihydroxy composite metal hydroxide, the cerium-sammarium nanocomposite material can be uniformly fixed on the layer or surface, allowing it to be evenly dispersed in the sheath layer matrix, reducing the "UV blind zone". Furthermore, the layered dihydroxy composite metal hydroxide can diffusely reflect UV rays that are not absorbed by the cerium-sammarium nanocomposite material, reducing direct UV radiation to the sheath layer matrix and forming a double barrier, thereby further enhancing the UV aging resistance of the sheath layer. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the structure of the stainless steel welded tube armored rodent-proof optical cable of the present invention;

[0048] In the diagram, 1 is the sheath layer; 2 is the stainless steel layer; 3 is the fiber optic grease; 4 is the optical fiber; and 5 is the armored steel wire layer. Detailed Implementation

[0049] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this invention.

[0050] Example 1: A method for manufacturing a stainless steel welded tube armored rodent-proof optical cable, comprising the following steps:

[0051] (1) Preparation of sheath material:

[0052] S1: Preparation of composite rodenticide

[0053] S1.1: Attapulgite clay was placed in 1 mol / L hydrochloric acid solution at a ratio of 1 g: 10 mL, stirred for 4 h, filtered, washed until neutral and dried, then calcined at 300 °C for 1 h, and after cooling to room temperature, ground and sieved to obtain pretreated attapulgite clay.

[0054] S1.2: Add sucrose octaacetate to acetone at a ratio of 1g:20mL, stir thoroughly to dissolve, and then add the pretreated attapulgite clay. Under nitrogen protection, heat and stir at 40℃ for 6 hours. After cooling, filter, dry and grind to obtain a composite rodent repellent. The mass ratio of pretreated attapulgite clay to sucrose octaacetate is 6:1.

[0055] S2: Preparation of modified flame retardants

[0056] S2.1: Dihydrocapsaicin and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide were added to toluene at a ratio of 1.4g:1g:8mL. The mixture was stirred and mixed evenly at 60°C under a nitrogen atmosphere to obtain a mixed reaction solution.

[0057] S2.2: Dissolve azobisisobutyronitrile in toluene at a ratio of 1g:400mL to obtain an azobisisobutyronitrile solution. Then add the azobisisobutyronitrile solution to the above mixed reaction solution and continue to stir and react for 46 hours. After cooling, remove the toluene by vacuum distillation and then separate by column chromatography to obtain the modified flame retardant. The volume ratio of azobisisobutyronitrile solution to the mixed reaction solution is 3.7:1.

[0058] S3: Preparation of composite UV stabilizers

[0059] S3.1: Add samarium nitrate solution to cerium nitrate solution at a volume ratio of 1:4, then add polyvinylpyrrolidone and mix thoroughly to obtain solution A. Then add ammonium carbonate to deionized water at a ratio of 1g:5mL and mix thoroughly to obtain solution B. The concentrations of samarium nitrate solution and cerium nitrate solution are both 0.2mol / L, and the solid-liquid ratio of polyvinylpyrrolidone to the total volume of samarium nitrate solution and cerium nitrate solution is 1g:480mL.

[0060] S3.2: While stirring, pour the above solution B into solution A and continue stirring for 1 hour. After filtration, washing, drying and grinding, place it in a muffle furnace and calcine at 650°C for 1 hour to obtain cerium-samarium nanocomposite material, wherein the volume ratio of solution A to solution B is 1:1.4.

[0061] S3.3: The above cerium-samarium nanocomposite material was dispersed in deionized water at a ratio of 1g:20mL, and 0.1mol / L sodium hydroxide solution was added to adjust the pH to 9. The mixture was then sonicated for 30min to obtain a cerium-samarium nanocomposite material dispersion.

[0062] S3.4: Add the layered dihydroxy complex metal hydroxide to formamide at a ratio of 1g:400mL, sonicate for 12h under nitrogen protection, then centrifuge at 3000rpm for 10min, collect the supernatant to obtain a suspension of layered dihydroxy complex metal hydroxide.

[0063] S3.5: While stirring, add the above cerium-sammarium nanocomposite material dispersion to the above layered dihydroxy composite metal hydroxide suspension, continue stirring for 4 hours, let stand and age for 10 hours, centrifuge at 9000 rpm for 10 minutes, collect the lower precipitate, wash and dry to obtain the composite UV inhibitor, wherein the mass ratio of cerium-sammarium nanocomposite material in the cerium-sammarium nanocomposite material dispersion to layered dihydroxy composite metal hydroxide in the layered dihydroxy composite metal hydroxide suspension is 1:3;

[0064] S4: Preparation of sheath layer material

[0065] 90 parts by weight of polyethylene, 4 parts by weight of the above-mentioned composite rodent repellent, 14 parts by weight of the above-mentioned modified flame retardant, 2 parts by weight of the above-mentioned composite UV inhibitor, 5 parts by weight of compatibilizer PE-g-MAH and 1 part by weight of polyethylene wax are mixed evenly and then placed in a twin-screw extruder for extrusion granulation to obtain the sheath layer material.

[0066] (2) Preparation of stainless steel strip welded tube armored rodent-proof optical cable:

[0067] Step 1: Fabrication of colored optical fibers

[0068] Bare optical fibers are colored into colored optical fibers of different colors;

[0069] Step 2: Preparation of stainless steel strip welded pipe layer

[0070] Multiple colored optical fibers are bundled together to form an optical fiber bundle, and then a stainless steel strip is wrapped around the optical fiber bundle. The bundle is then butt-welded by a pipe welding machine to form a stainless steel strip welded pipe layer. At the same time, fiber grease is injected into the stainless steel strip welded pipe for filling, and then embossing is performed.

[0071] Step 3: Prepare the armored steel wire layer

[0072] Galvanized high-carbon steel wire is twisted around a stainless steel strip welded pipe in a "concentric twisting" manner to form an armored steel wire layer;

[0073] Step 4: Prepare the sheath layer

[0074] A stainless steel welded tube armored rodent-proof optical cable is obtained by extruding a sheath layer over the armored steel wire layer using an extruder. Its structural diagram is shown below. Figure 1 As shown.

[0075] Example 2: A method for manufacturing a stainless steel welded tube armored rodent-proof optical cable, comprising the following steps:

[0076] (1) Preparation of sheath material:

[0077] S1: Preparation of composite rodenticide

[0078] S1.1: Attapulgite clay was placed in 1 mol / L hydrochloric acid solution at a ratio of 1 g: 15 mL, stirred for 5 h, filtered, washed until neutral and dried, then calcined at 350℃ for 1.5 h, and after cooling to room temperature, ground and sieved to obtain pretreated attapulgite clay.

[0079] S1.2: Add sucrose octaacetate to acetone at a ratio of 1g:25mL, stir thoroughly to dissolve, and then add the pretreated attapulgite clay. Under nitrogen protection, heat and stir at 45℃ for 7 hours. After cooling, filter, dry and grind to obtain a composite rodent repellent. The mass ratio of pretreated attapulgite clay to sucrose octaacetate is 7:1.

[0080] S2: Preparation of modified flame retardants

[0081] S2.1: Add dihydrocapsaicin and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide to toluene at a ratio of 1.5g:1g:9mL, and stir and mix evenly at 65°C under a nitrogen atmosphere to obtain a mixed reaction solution;

[0082] S2.2: Azobisisobutyronitrile was dissolved in toluene at a ratio of 1 g: 450 mL to obtain an azobisisobutyronitrile solution. The azobisisobutyronitrile solution was then added to the above mixed reaction solution, and the reaction was continued to be carried out under heat and stirred for 47 h. After cooling, the toluene was removed by vacuum distillation, and then separated by column chromatography to obtain the modified flame retardant. The volume ratio of the azobisisobutyronitrile solution to the mixed reaction solution was 3.75:1.

[0083] S3: Preparation of composite UV stabilizers

[0084] S3.1: Add samarium nitrate solution to cerium nitrate solution at a volume ratio of 1:4.5, then add polyvinylpyrrolidone and mix thoroughly to obtain solution A. Then add ammonium carbonate to deionized water at a volume ratio of 1g:5.5mL and mix thoroughly to obtain solution B. The concentrations of samarium nitrate solution and cerium nitrate solution are both 0.2mol / L, and the solid-liquid ratio of polyvinylpyrrolidone to the total volume of samarium nitrate solution and cerium nitrate solution is 1g:490mL.

[0085] S3.2: While stirring, pour the above solution B into solution A and continue stirring for 1.5 h. After filtration, washing, drying and grinding, place it in a muffle furnace and calcine at 700℃ for 1.5 h to obtain cerium samarium nanocomposite material, wherein the volume ratio of solution A to solution B is 1:1.5.

[0086] S3.3: The above cerium-samarium nanocomposite material was dispersed in deionized water at a ratio of 1g:25mL, and 0.1mol / L sodium hydroxide solution was added to adjust the pH to 9.5. Then, the mixture was sonicated for 35min to obtain a cerium-samarium nanocomposite material dispersion.

[0087] S3.4: Add the layered dihydroxy complex metal hydroxide to formamide at a ratio of 1g:450mL, sonicate for 14h under nitrogen protection, then centrifuge at 3500rpm for 12.5min, collect the supernatant to obtain a suspension of layered dihydroxy complex metal hydroxide.

[0088] S3.5: While stirring, add the above cerium-sammarium nanocomposite material dispersion to the above layered dihydroxy composite metal hydroxide suspension, continue stirring for 5 hours, let stand and age for 11 hours, centrifuge at 9500 rpm for 12.5 minutes, collect the lower precipitate, wash and dry to obtain the composite UV inhibitor, wherein the mass ratio of cerium-sammarium nanocomposite material in the cerium-sammarium nanocomposite material dispersion to layered dihydroxy composite metal hydroxide in the layered dihydroxy composite metal hydroxide suspension is 1:4;

[0089] S4: Preparation of sheath layer material

[0090] 95 parts by weight of polyethylene, 5 parts by weight of the above-mentioned composite rodent repellent, 16 parts by weight of the above-mentioned modified flame retardant, 3 parts by weight of the above-mentioned composite UV inhibitor, 6.5 parts by weight of compatibilizer POE-g-MAH and 1.5 parts by weight of polyethylene wax are mixed evenly and then placed in a twin-screw extruder for extrusion granulation to obtain the sheath layer material.

[0091] (2) Preparation of stainless steel strip welded tube armored rodent-proof optical cable:

[0092] Step 1: Fabrication of colored optical fibers

[0093] Bare optical fibers are colored into colored optical fibers of different colors;

[0094] Step 2: Preparation of stainless steel strip welded pipe layer

[0095] Multiple colored optical fibers are bundled together to form an optical fiber bundle, and then a stainless steel strip is wrapped around the optical fiber bundle. The bundle is then butt-welded by a pipe welding machine to form a stainless steel strip welded pipe layer. At the same time, fiber grease is injected into the stainless steel strip welded pipe for filling, and then embossing is performed.

[0096] Step 3: Prepare the armored steel wire layer

[0097] Galvanized high-carbon steel wire is twisted around a stainless steel strip welded pipe in a "concentric twisting" manner to form an armored steel wire layer;

[0098] Step 4: Prepare the sheath layer

[0099] A stainless steel welded tube armored rodent-proof optical cable is obtained by extruding a sheath layer over the armored steel wire layer using an extruder. Its structural diagram is shown below. Figure 1 As shown.

[0100] Example 3: A method for manufacturing a stainless steel welded tube armored rodent-proof optical cable, comprising the following steps:

[0101] (1) Preparation of sheath material:

[0102] S1: Preparation of composite rodenticide

[0103] S1.1: Attapulgite clay was placed in 1 mol / L hydrochloric acid solution at a ratio of 1 g: 20 mL, stirred for 6 h, filtered, washed until neutral and dried, then calcined at 400℃ for 2 h, and after cooling to room temperature, ground and sieved to obtain pretreated attapulgite clay.

[0104] S1.2: Add sucrose octaacetate to acetone at a ratio of 1g:30mL, stir thoroughly to dissolve, and then add the pretreated attapulgite clay. Under nitrogen protection, heat and stir at 50°C for 8 hours. After cooling, filter, dry and grind to obtain a composite rodent repellent. The mass ratio of pretreated attapulgite clay to sucrose octaacetate is 8:1.

[0105] S2: Preparation of modified flame retardants

[0106] S2.1: Dihydrocapsaicin and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide were added to toluene at a ratio of 1.6g:1g:10mL. The mixture was stirred and mixed evenly at 70°C under a nitrogen atmosphere to obtain a mixed reaction solution.

[0107] S2.2: Dissolve azobisisobutyronitrile in toluene at a ratio of 1g:500mL to obtain an azobisisobutyronitrile solution. Then add the azobisisobutyronitrile solution to the above mixed reaction solution and continue to stir and react for 48 hours. After cooling, remove the toluene by vacuum distillation and then separate by column chromatography to obtain the modified flame retardant. The volume ratio of azobisisobutyronitrile solution to the mixed reaction solution is 3.8:1.

[0108] S3: Preparation of composite UV stabilizers

[0109] S3.1: Add samarium nitrate solution to cerium nitrate solution at a volume ratio of 1:5, then add polyvinylpyrrolidone and mix thoroughly to obtain solution A. Then add ammonium carbonate to deionized water at a ratio of 1g:6mL and mix thoroughly to obtain solution B. The concentrations of samarium nitrate solution and cerium nitrate solution are both 0.2mol / L, and the solid-liquid ratio of polyvinylpyrrolidone to the total volume of samarium nitrate solution and cerium nitrate solution is 1g:500mL.

[0110] S3.2: While stirring, pour the above liquid B into liquid A and continue stirring for 2 hours. After filtration, washing, drying and grinding, place it in a muffle furnace and calcine at 750°C for 2 hours to obtain cerium-samarium nanocomposite material, wherein the volume ratio of liquid A to liquid B is 1:1.6.

[0111] S3.3: The above cerium-samarium nanocomposite material was dispersed in deionized water at a ratio of 1g:30mL, and 0.1mol / L sodium hydroxide solution was added to adjust the pH to 10. The mixture was then sonicated for 40min to obtain a cerium-samarium nanocomposite material dispersion.

[0112] S3.4: Add the layered dihydroxy complex metal hydroxide to formamide at a ratio of 1g:500mL, sonicate for 16h under nitrogen protection, then centrifuge at 4000rpm for 15min, collect the supernatant to obtain a suspension of layered dihydroxy complex metal hydroxide.

[0113] S3.5: While stirring, add the above cerium-sammarium nanocomposite material dispersion to the above layered dihydroxy composite metal hydroxide suspension, continue stirring for 6 hours, let stand and age for 12 hours, centrifuge at 10000 rpm for 15 minutes, collect the lower precipitate, wash and dry to obtain the composite UV inhibitor, wherein the mass ratio of cerium-sammarium nanocomposite material in the cerium-sammarium nanocomposite material dispersion to layered dihydroxy composite metal hydroxide in the layered dihydroxy composite metal hydroxide suspension is 1:5;

[0114] S4: Preparation of sheath layer material

[0115] 100 parts by weight of polyethylene, 6 parts by weight of the above-mentioned composite rodent repellent, 18 parts by weight of the above-mentioned modified flame retardant, 4 parts by weight of the above-mentioned composite UV inhibitor, 8 parts by weight of compatibilizer POE-g-MAH and 2 parts by weight of polyethylene wax are mixed evenly and then placed in a twin-screw extruder for extrusion granulation to obtain the sheath layer material.

[0116] (2) Preparation of stainless steel strip welded tube armored rodent-proof optical cable:

[0117] Step 1: Fabrication of colored optical fibers

[0118] Bare optical fibers are colored into colored optical fibers of different colors;

[0119] Step 2: Preparation of stainless steel strip welded pipe layer

[0120] Multiple colored optical fibers are bundled together to form an optical fiber bundle, and then a stainless steel strip is wrapped around the optical fiber bundle. The bundle is then butt-welded by a pipe welding machine to form a stainless steel strip welded pipe layer. At the same time, fiber grease is injected into the stainless steel strip welded pipe for filling, and then embossing is performed.

[0121] Step 3: Prepare the armored steel wire layer

[0122] Galvanized high-carbon steel wire is twisted around a stainless steel strip welded pipe in a "concentric twisting" manner to form an armored steel wire layer;

[0123] Step 4: Prepare the sheath layer

[0124] A stainless steel welded tube armored rodent-proof optical cable is obtained by extruding a sheath layer over the armored steel wire layer using an extruder. Its structural diagram is shown below. Figure 1 As shown.

[0125] Comparative Example 1 differs from Example 1 in that the composite rodenticide in step S4 is removed.

[0126] Comparative Example 2 differs from Example 1 in that the modified flame retardant in step S4 is removed.

[0127] Comparative Example 3 differs from Example 1 in that the composite rodent repellent in step S4 is replaced with an equal amount of modified flame retardant.

[0128] Comparative Example 4 differs from Example 1 in that the modified flame retardant in step S4 is replaced with an equal amount of composite rodent repellent.

[0129] Comparative Example 5 differs from Example 1 in that the composite UV stabilizer in step S4 is removed.

[0130] Comparative Example 6 differs from Example 1 in that steps S3.3-3.5 are removed, and the cerium samarium nanocomposite material is directly mixed with polyethylene, nylon 12, composite rodent repellent, modified flame retardant, compatibilizer and lubricant to prepare the sheath layer material.

[0131] Test example:

[0132] Test 1: The stainless steel welded tube armored rodent-proof optical cables prepared in Examples 1-3 and Comparative Examples 1, 3, and 4, as well as the commercially available rodent-proof optical cable (Hengxu GYXTS), were tested according to GB / T34016-2017 "General Rules for Rodent-proof and Ant-proof Wires and Cables" to evaluate their rodent-proof performance. The results are shown in Table 1.

[0133]

[0134] As shown in Table 1 above, the rodent-proof performance of the stainless steel strip welded tube armored rodent-proof optical cable prepared in Comparative Example 1 without the addition of the composite rodent repellent is worse than that in Example 1. This shows that by first acid treating attapulgite with hydrochloric acid to increase the surface active sites and provide anchoring points for subsequent adsorption of sucrose octaacetate, and then calcining it to make its pore structure more stable, and then adding the calcined pretreated attapulgite to an acetone solution of sucrose octaacetate for adsorption under nitrogen protection, sucrose octaacetate is loaded on the inner surface and pores of attapulgite to obtain a composite rodent repellent. After melt extrusion with polyethylene and other materials to form a sheath material, a better rodent-proof effect can be achieved.

[0135] Furthermore, in Comparative Examples 3 and 4, when only one of the modified flame retardant or the composite rodent repellent was used, the rodent-proof performance of the stainless steel strip welded tube armored rodent-proof optical cable was better than that of Comparative Example 1, but still worse than that of Example 1. It can be seen that the modified flame retardant and the composite rodent repellent can form a dual stimulus, thereby synergistically enhancing the rodent-repelling effect of the sheath layer.

[0136] Test 2: The limiting oxygen index of the sheath materials prepared in Examples 1-3 and Comparative Example 2 were tested in parallel three times, and the average value was taken. The results are shown in Table 2.

[0137]

[0138] As can be seen from Table 2 above, the limiting oxygen index of the sheath material prepared in Comparative Example 2 without modifying the flame retardant is much lower than that in Example 1. This shows that by adding dihydrocapsaicin and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide to toluene and reacting it under the initiation of azobisisobutyronitrile to obtain a modified flame retardant, and then melt-extruding it with polyethylene and other materials to form a sheath material, the flame retardant performance of the sheath material can be effectively improved.

[0139] Test 3: The sheathing materials prepared in Examples 1-3 and Comparative Examples 5-6 were tested according to ISO 4892-3-2003, with an ultraviolet wavelength of 360 nm and a light intensity of 100 W / m². 2 The tensile strength retention rate after irradiation for 720 hours was tested, and the test was repeated three times. The average value was taken. The results are shown in Table 3.

[0140]

[0141] As shown in Table 3, in Comparative Example 5, without the addition of the composite UV stabilizer, the tensile strength retention rate of the sheath material after 720 hours of UV irradiation was much lower than that in Example 1. This indicates that by first preparing cerium-sammarium nanocomposite materials using samarium nitrate solution and cerium nitrate solution as raw materials, alkalizing them, and then adding them to a layered dihydroxy composite metal hydroxide suspension to form a layered dihydroxy composite metal hydroxide intercalated with cerium-sammarium nanocomposite materials, a composite UV stabilizer is obtained. After melt extruding this with polyethylene and other materials to form a sheath material, the UV aging resistance of the sheath material can be effectively improved. In Comparative Example 6, when cerium-sammarium nanocomposite materials were directly added to the sheath material, although the tensile strength retention rate after 720 hours of UV irradiation was higher than that of Comparative Example 5, it was still lower than that of Example 1. Therefore, intercalating cerium-sammarium nanocomposite materials with layered dihydroxy composite metal hydroxide can further improve the UV aging resistance of the sheath material.

[0142] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims. Parts not described in detail in this specification are prior art known to those skilled in the art.

Claims

1. A stainless steel welded tube armored rodent-proof optical cable, characterized in that, It includes, from the inside out, an optical fiber layer, a fiber grease layer, a stainless steel strip welded tube layer, an armored steel wire layer, and a sheath layer; The stainless steel strip welded pipe layer is formed by butt welding of stainless steel strips with a pipe welding machine, and the stainless steel strip welded pipe is embossed after welding. The preparation steps of the sheath layer material are as follows: S1: Preparation of composite rodenticide After pretreatment, attapulgite is added to an acetone solution of sucrose octaacetate and reacted under nitrogen protection to obtain a composite rodent repellent. S2: Preparation of modified flame retardants Dihydrocapsaicin and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide were dissolved in toluene, and then azobisisobutyronitrile solution was added to react and obtain a modified flame retardant. S3: Preparation of composite UV stabilizers S3.1: Add samarium nitrate solution to cerium nitrate solution at a volume ratio of 1:(4-5), then add polyvinylpyrrolidone and mix thoroughly to obtain solution A. Then add ammonium carbonate to deionized water at a volume ratio of 1g:(5-6)mL and mix thoroughly to obtain solution B. S3.2: While stirring, pour the above solution B into solution A and continue stirring for 1-2 hours. After filtration, washing, drying and grinding, place it in a muffle furnace and calcine at 650-750℃ for 1-2 hours to obtain cerium-samarium nanocomposite material. S3.3: Disperse the above cerium-samarium nanocomposite material in deionized water at a ratio of 1g:(20-30)mL, add 0.1mol / L sodium hydroxide solution to adjust the pH to 9-10, and then sonicate for 30-40min to obtain a cerium-samarium nanocomposite material dispersion; S3.4: Add the layered dihydroxy complex metal hydroxide to formamide at a ratio of 1g:(400-500)mL, sonicate for 12-16h under nitrogen protection, then centrifuge at 3000-4000rpm for 10-15min, collect the supernatant, and obtain a suspension of layered dihydroxy complex metal hydroxide. S3.5: While stirring, add the above cerium-samarium nanocomposite dispersion to the above layered dihydroxy composite metal hydroxide suspension, continue stirring for 4-6 hours, let stand and age for 10-12 hours, centrifuge at 9000-10000 rpm for 10-15 minutes, collect the lower precipitate, wash and dry to obtain the composite UV inhibitor; S4: Preparation of sheath layer material The polyethylene, the above-mentioned composite rodent repellent, the above-mentioned modified flame retardant, the above-mentioned composite UV inhibitor, compatibilizer and lubricant are mixed evenly and then placed in a twin-screw extruder for extrusion granulation to obtain the sheath layer material.

2. The stainless steel welded tube armored rodent-proof optical cable according to claim 1, characterized in that, S1 specifically includes the following steps: S1.1: Place attapulgite in a 1 mol / L hydrochloric acid solution at a ratio of 1 g: (10-20) mL, stir for 4-6 h, filter, wash until neutral and dry, then calcine at 300-400℃ for 1-2 h, and after cooling to room temperature, grind and sieve to obtain pretreated attapulgite. S1.2: Add sucrose octaacetate to acetone at a ratio of 1g:(20-30)mL, stir thoroughly to dissolve, and then add the pretreated attapulgite clay. Under nitrogen protection, heat and stir at 40-50℃ for 6-8 hours. After cooling, filter, dry and grind to obtain a composite rodent repellent.

3. The stainless steel welded tube armored rodent-proof optical cable according to claim 2, characterized in that, Step S2 specifically includes the following steps: S2.1: Add dihydrocapsaicin and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide to toluene at a ratio of (1.4-1.6)g:1g:(8-10)mL, and stir and mix evenly at 60-70℃ under a nitrogen atmosphere to obtain a mixed reaction solution. S2.2: Dissolve azobisisobutyronitrile in toluene at a ratio of 1 g: (400-500) mL to obtain an azobisisobutyronitrile solution. Then add the azobisisobutyronitrile solution to the above mixed reaction solution and continue to stir and react for 46-48 h. After cooling, remove the toluene by vacuum distillation and then separate by column chromatography to obtain the modified flame retardant. The volume ratio of azobisisobutyronitrile solution to the mixed reaction solution is (3.7-3.8):

1.

4. The stainless steel welded tube armored rodent-proof optical cable according to claim 2, characterized in that, The mass ratio of pretreated attapulgite to sucrose octaacetic acid ester is (6-8):

1.

5. The stainless steel welded tube armored rodent-proof optical cable according to claim 1, characterized in that, The concentrations of samarium nitrate solution and cerium nitrate solution are both 0.2 mol / L, and the solid-liquid ratio of polyvinylpyrrolidone to the total volume of samarium nitrate solution and cerium nitrate solution is 1 g: (480-500) mL.

6. The stainless steel welded tube armored rodent-proof optical cable according to claim 1, characterized in that, The volume ratio of liquid A to liquid B is 1:(1.4-1.6).

7. The stainless steel welded tube armored rodent-proof optical cable according to claim 1, characterized in that, The mass ratio of cerium samarium nanocomposite material in the dispersion to layered dihydroxy composite metal hydroxide in the suspension is 1:(3-5).

8. A stainless steel welded tube armored rodent-proof optical cable according to claim 1, characterized in that, By weight, the raw material composition of the sheath layer material is: 90-100 parts polyethylene, 4-6 parts composite rodent repellent, 14-18 parts modified flame retardant, 2-4 parts composite UV stabilizer, 5-8 parts compatibilizer and 1-2 parts lubricant, wherein the compatibilizer is either PE-g-MAH or POE-g-MAH, and the lubricant is polyethylene wax.

9. A method for manufacturing a stainless steel strip welded tube armored rodent-proof optical cable as described in any one of claims 1-8, characterized in that, Includes the following steps: Step 1: Fabrication of colored optical fibers Bare optical fibers are colored into colored optical fibers of different colors; Step 2: Preparation of stainless steel strip welded pipe layer Multiple colored optical fibers are bundled together to form an optical fiber bundle, and then a stainless steel strip is wrapped around the optical fiber bundle. The bundle is then butt-welded by a pipe welding machine to form a stainless steel strip welded pipe layer. At the same time, fiber grease is injected into the stainless steel strip welded pipe for filling, and then embossing is performed. Step 3: Prepare the armored steel wire layer Galvanized high-carbon steel wire is twisted around a stainless steel strip welded pipe in a "concentric twisting" manner to form an armored steel wire layer; Step 4: Prepare the sheath layer A stainless steel strip welded tube armored rodent-proof optical cable is obtained by extruding a sheath layer over the armored steel wire layer using an extruder.

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