Cobweb optical fiber ribbon cable and preparation method thereof

Abstract

The invention discloses a cobweb optical fiber ribbon optical cable and a preparation method thereof, and relates to the technical field of optical cable materials. The cobweb optical fiber ribbon optical cable is at least composed of a central reinforcing piece, a hollow-core optical fiber ribbon unit, a protection unit and a sheath layer. The hollow-core optical fiber ribbon unit surrounds the outer side of the central reinforcing piece, the protection unit surrounds and wraps the outer side of the hollow-core optical fiber ribbon unit, and the sheath layer wraps the outer side of the protection unit; the hollow-core optical fiber ribbon unit is obtained by fixing a plurality of spider web structure cladding hollow-core optical fibers with coating layers on the surfaces through an adhesive; according to the application, the coating layer is prepared on the spider web structure cladding hollow-core optical fiber by adopting a novel coating material, so that the problems of structure protection and interface compatibility are solved; and the novel adhesive is utilized to solve the problems of modulus matching and delamination, and finally the cobweb optical fiber ribbon cable with stable performance is prepared.

Description

Technical Field

[0001] This invention relates to the field of optical cable materials technology, specifically to a spider web fiber ribbon optical cable and its preparation method. Background Technology

[0002] With the convergence of television networks, telecommunications networks, and computer networks, the demand for data transmission speeds is increasing, making the replacement of copper with fiber optic cables an inevitable trend. In long-distance transmission, low-loss, high-bandwidth silica optical fiber has significant advantages. The transmission loss of optical fiber is largely determined by the intrinsic absorption loss of the fiber materials. High-purity silica has an intrinsic absorption loss as low as 0.2 dB / km, close to its theoretical limit, making it suitable for trunk and transoceanic cable laying. However, silica optical fiber is expensive, has a small core diameter, is difficult to couple, and is challenging to splice, limiting its application in access networks. Therefore, plastic optical fibers with large core diameters and good mechanical properties have attracted attention.

[0003] Compared to silica fiber, plastic optical fiber offers advantages such as simpler manufacturing, lower cost, faster splicing, higher impact resistance, and radiation resistance, making it highly suitable for short-to-medium distance, small-to-medium capacity fiber optic communication systems in local area networks. While plastic optical fiber possesses many advantages unmatched by silica fiber, its transmission loss is significant, ranging from approximately 100dB / km to 300dB / km. The light intensity drops by half after just 20 meters or less. Employing a spiderweb-structured cladding hollow-core Bragg fiber can drastically reduce the fiber loss of plastic optical fiber, compressing the absorption loss of the fiber's constituent materials to 10 dB / km. 4 -10 6 This technology, by reducing optical fiber loss by one-third, fundamentally solves the problem of high loss in plastic optical fibers. Building upon this foundation, and fully utilizing the advantages of plastic optical fibers—their flexibility and bendability—it can achieve low-loss transmission of information and energy across all optical bands. This new generation of plastic optical fibers will become the most widely used and prevalent type of optical fiber.

[0004] Spiderweb-clad hollow Bragg plastic optical fibers, with their advantages of low transmission loss, electromagnetic interference resistance, and lightweight design due to their hollow structure, show significant potential for short-distance communication. However, the transmission capacity of a single spiderweb fiber is limited, making it difficult to meet the needs of parallel transmission of multiple signals. Therefore, integrating multiple spiderweb fibers into ribbon optical cables has become a key direction for improving transmission capacity. However, the integration technology for spiderweb fibers is still immature, mainly suffering from the following drawbacks: First, the mechanical strength of the spiderweb cladding is lower than that of solid fibers. When integrating multiple fibers, the use of traditional ribbon adhesives, modulus mismatch, or temperature changes can cause stress on the fibers, easily leading to deformation of the spiderweb structure, increased loss, and affected optical performance. Second, existing fiber ribbon adhesives have poor compatibility with the coating layer of spiderweb fibers, easily resulting in delamination and reduced cable stability. Therefore, developing a fabrication technology suitable for integrating multiple spiderweb fiber units is crucial to solving these problems. Summary of the Invention

[0005] The purpose of this invention is to provide a spider web-shaped optical fiber ribbon cable and its preparation method, thereby solving the following technical problems:

[0006] Spider web fiber has low mechanical strength in its spider web cladding. When multiple fibers are integrated, the use of traditional adhesive tape can cause stress on the fiber due to modulus mismatch or temperature changes, which can easily lead to deformation of the spider web structure. In addition, the existing fiber tape adhesive has poor compatibility with the spider web fiber coating, which can easily cause delamination and reduce the stability of the optical cable.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] A spider web fiber ribbon cable, comprising at least a central strengthening member, a hollow fiber ribbon unit, a protective unit, and a sheath layer; the hollow fiber ribbon unit surrounds the outside of the central strengthening member, the protective unit surrounds and covers the outside of the hollow fiber ribbon unit, and the sheath layer wraps around the outside of the protective unit.

[0009] The hollow fiber ribbon unit is obtained by fixing multiple spider web-structured hollow fibers with coated surfaces using an adhesive.

[0010] The adhesive comprises the following raw materials by weight percentage: 58%-68% polyurethane acrylate resin, 10-15% core-shell rubber particles, 5-8% acrylate-terminated polydimethylsiloxane, 8%-12% reactive diluent, 4%-6% adhesion promoter, 2%-3% photoinitiator, and 0.2%-0.5% light stabilizer, the sum of the raw material weight percentages being 100%.

[0011] The preparation method of core-shell rubber particles includes the following steps:

[0012] S1: In a nitrogen atmosphere, deionized water and sodium dodecyl sulfate are added to the reactor for dispersion. The core layer monomer and divinylbenzene are then mixed and added to the reactor. The temperature is controlled at 70-80℃. Potassium persulfate is added, and the reaction is carried out for 3-6 hours to obtain component one.

[0013] S2: Control the temperature of component one at 65-70℃, add the shell monomer and allyl methacrylate to the reaction vessel, keep the temperature for 1-2 hours, control the temperature at 75-80℃ and keep the temperature for 2-4 hours to obtain component two.

[0014] S3: Control the temperature of component two at 75-80℃, add hydroxyethyl methacrylate and ethylene glycol dimethacrylate into the reactor, control the temperature at 80-85℃, keep the reaction at this temperature for 1-3 hours, filter and spray dry to obtain core-shell rubber particles.

[0015] As a further aspect of the present invention: the polyurethane acrylate resin is a polyether-type difunctional polyurethane acrylate; the adhesion promoter is an adhesion promoter containing phosphate ester groups; and the reactive diluent is methoxy polyethylene glycol acrylate.

[0016] As a further aspect of the present invention: the core layer monomer in S1 is composed of butyl acrylate and ethylhexyl acrylate in a mass ratio of 60-70:20-30; the addition ratio of deionized water, sodium dodecyl sulfate, core layer monomer, divinylbenzene, and potassium persulfate is 100-150mL:0.3-0.5g:60-90g:0.3-0.5g:0.1-0.2g.

[0017] As a further aspect of the present invention: the shell monomer is composed of methyl methacrylate and styrene in a mass ratio of 8.5-9:1;

[0018] The amount of shell monomer added accounts for 8%-15% of the total mass of core monomer; allyl methacrylate accounts for 3-5% of the total mass of shell monomer.

[0019] As a further aspect of the present invention: the amount of hydroxyethyl methacrylate added in S3 accounts for 2%-8% of the total mass of the shell monomers; the amount of ethylene glycol dimethacrylate added accounts for 0.5%-3% of the total mass of the shell monomers.

[0020] As a further aspect of the present invention, the method for preparing acrylate-terminated polydimethylsiloxane includes the following steps:

[0021] In a nitrogen atmosphere, hydrogen-containing polydimethylsiloxane, toluene, and hydroquinone were dispersed in a reaction vessel and the temperature was controlled at 60-70℃. Hydroxyethyl acrylate was added and the mixture was kept at this temperature for 1-2 hours. Isopropanol chloroplatinate solution was then added to the reaction vessel and the temperature was controlled at 80-100℃. The mixture was kept at this temperature for 5-6 hours. The mixture was then distilled under reduced pressure, cooled to room temperature, and filtered to obtain acrylate-terminated polydimethylsiloxane.

[0022] As a further aspect of the present invention, the coating layer comprises the following raw materials in parts by weight: 50%-60% flexible polyether polyurethane acrylate, 30%-40% perfluorinated polyether modified acrylate, 5%-8% aminated modified nano boron nitride, 0.2%-0.3% polyacrylate dispersant, 0.5%-1% acrylate modified fluorinated surfactant, 1%-2% KH-550, 0.8-1% photoinitiator, and 0.2%-0.5% auxiliary initiator, the sum of the weight percentages of the raw materials being 100%.

[0023] As a further embodiment of the present invention, the preparation method of aminated modified boron nitride nanoparticles includes the following steps: adding hydroxylated boron nitride, KH550, anhydrous ethanol, and deionized water into a reaction vessel, controlling the temperature at 50-60℃, keeping it at that temperature for 2-4 hours, washing, and drying to obtain aminated modified boron nitride nanoparticles.

[0024] As a further aspect of the present invention, the preparation method of hydroxylated boron nitride includes the following steps: adding nano boron nitride and sodium hydroxide solution to a reaction vessel, controlling the temperature at 90-95℃, keeping the reaction at this temperature for 3-6 hours, washing and drying to obtain hydroxylated boron nitride;

[0025] The addition ratio of hydroxylated boron nitride, KH550, anhydrous ethanol, and deionized water is 10g: 1-2g: 40-80mL: 10-20mL.

[0026] As a further aspect of the present invention: the protective unit includes an aerogel buffer layer wrapped around the surface of the hollow fiber ribbon unit and an aramid fiber braided layer uniformly distributed circumferentially on the outer surface of the aerogel buffer layer.

[0027] As a further embodiment of the present invention, a water-blocking strip is also provided between the protective unit and the sheath layer.

[0028] The above-mentioned method for preparing a spider web-structured clad hollow fiber cable includes the following steps: placing spider web-structured hollow fiber with a coating layer on its surface into an arrangement mold and spacing them apart, filling the gaps with adhesive, and curing the fiber to obtain a hollow fiber ribbon unit.

[0029] Wrap the hollow fiber ribbon unit around the central reinforcement;

[0030] A protective unit and a sheath layer are sequentially wrapped around the outside of the hollow fiber ribbon unit to obtain a spider web fiber ribbon cable.

[0031] The beneficial effects of this invention are:

[0032] (1) The adhesive, coating and optical fiber form a gradient modulus, and a flexible transition layer is formed between the adhesive and the coating. The interface bonding strength is high, which makes the optical cable perform stably for a long time under temperature cycling or external stress.

[0033] This application uses polyurethane acrylate resin as a base material to prepare an adhesive. A long-chain, polyether-type, low-functionality (e.g., difunctional) polyurethane acrylate resin is selected to ensure that the modulus after curing is within the target range, providing hydrogen bonding ability between the main structure and the coating layer. Core-shell rubber particles are then added to the adhesive as energy dissipation centers to absorb impact energy and inhibit crack propagation. The hydroxyl groups on the molecular chains of the core-shell rubber particles chemically crosslink with the polyurethane acrylate resin matrix, preventing debonding. Acrylate-terminated polydimethylsiloxane is also added as an interface modifier, participating in curing through covalent bonds to form a stable, flexible transition layer at the interface, reducing interfacial stress and improving delamination resistance. Finally, an active diluent, adhesion promoter, photoinitiator, and light stabilizer are added. The adhesion promoter is a phosphate-containing acrylate that forms a chemical adsorption. The photoinitiator and light stabilizer are used in combination to ensure complete curing and the adhesive's resistance to ultraviolet aging.

[0034] The adhesive prepared in this application features low modulus and UV curability. After curing, the colloid is flexible and will not generate significant stress that could compress the optical fiber due to temperature changes or bending, thus preventing deformation of the fiber's microstructure. It perfectly solves the interfacial mismatch problem between rigid adhesives and flexible coating layers. Acrylic-terminated polydimethylsiloxane forms an elastic transition layer at the interface; its low surface energy and high fluidity can release shear stress caused by temperature changes or mechanical deformation. The adhesive prepared in this application exhibits excellent interfacial compatibility with the coating layer, enabling molecular diffusion and entanglement to form a strong interface and enhance resistance to delamination.

[0035] (2) A coating layer is set on the surface of the optical fiber to solve the interface compatibility problem.

[0036] This application uses a flexible polyether-type polyurethane acrylate with a modulus of 0.2-0.5 GPa, which is UV-cured, as the matrix for the coating layer, providing elasticity. A perfluoropolyether-modified acrylate is then added to the coating layer to provide low refractive index and barrier properties. Aminated nano-boron nitride is also added to provide lateral rigidity and thermal conductivity, and polyacrylate dispersants are used to improve the uniformity of dispersion of the aminated nano-boron nitride in the matrix. Finally, KH-550, acrylate-modified fluorinated surfactants, photoinitiators, and auxiliary initiators are added. KH-550 enhances the interfacial bonding between the coating layer and the optical fiber cladding; the acrylate-modified fluorinated surfactant ensures compatibility and stability between the flexible polyether-type polyurethane acrylate and the perfluoropolyether-modified acrylate, preventing phase separation; the photoinitiator and auxiliary initiator are used in combination to achieve deep curing. The coating layer prepared in this application enables the stress of the optical fiber to be absorbed by the elastic matrix and uniformly dispersed through the h-BN sheet when the optical fiber is subjected to lateral compression, thus avoiding stress concentration that could puncture the spider web structure; its high thermal conductivity ensures that heat is rapidly and uniformly distributed when the temperature changes, reducing local thermal stress.

[0037] This application adjusts the modulus and interfacial bonding force of the coating layer, adhesive, and optical fiber cladding. The modulus of the coating layer is between that of the optical fiber cladding and the adhesive, resulting in a gradient transition that reduces stress concentration. The coefficient of thermal expansion is matched to that of the optical fiber cladding, preventing delamination at the adhesive-coating interface under thermo-mechanical stress. This stabilizes the optical fiber's position within the cable, avoids additional micro-bends caused by external forces, reduces optical signal loss, and maintains the long-term reliability of the optical cable. Detailed Implementation

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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.

[0039] Example 1: The preparation method of acrylate-terminated polydimethylsiloxane includes the following steps:

[0040] In a nitrogen atmosphere, 80g of hydrogen-containing polydimethylsiloxane, 50mL of toluene, and 0.03g of hydroquinone were added to a reaction vessel and dispersed. The temperature was controlled at 60-70℃. 7g of hydroxyethyl acrylate was added and the mixture was kept at this temperature for 1-2 hours. 0.08g of isopropanol chloroplatinate solvent (containing 0.08mg of platinum) was added to the reaction vessel and the temperature was controlled at 80-100℃. The mixture was kept at this temperature for 5-6 hours. The mixture was then distilled under reduced pressure, cooled to room temperature, and filtered to obtain acrylate-terminated polydimethylsiloxane.

[0041] The preparation method of amination-modified boron nitride nanoparticles includes the following steps:

[0042] A1: Place the nano-boron nitride in a reaction vessel with a 5 mol / L sodium hydroxide solution, control the temperature at 90℃, keep the reaction at this temperature for 3 h, wash and dry to obtain hydroxylated boron nitride;

[0043] A2: Add 10g of hydroxylated boron nitride, 1g of KH550, 40mL of anhydrous ethanol and 10mL of deionized water to a reaction vessel, control the temperature at 50℃ and treat for 2h, wash and dry to obtain amino-modified nano boron nitride.

[0044] The preparation method of core-shell rubber particles includes the following steps:

[0045] S1: In a nitrogen atmosphere, 100 mL of deionized water and 0.3 g of sodium dodecyl sulfate were added to the reaction vessel and dispersed. 60 g of butyl acrylate, 20 g of ethylhexyl acrylate and 0.3 g of divinylbenzene were mixed and added to the reaction vessel. The temperature was controlled at 70 °C. 0.1 g of potassium persulfate was added and the reaction was carried out for 3-6 h to obtain component one.

[0046] S2: Component 1 is kept at a temperature of 65℃. 8.5g of methyl methacrylate, 1g of styrene, and 0.4g of allyl methacrylate are mixed and added to the reactor. The mixture is kept at this temperature for 1 hour. Then, the mixture is kept at a temperature of 75℃ for 2 hours to obtain Component 2.

[0047] S3: Component 2 is controlled at 75℃. 0.4g of hydroxyethyl methacrylate and 0.19g of ethylene glycol dimethacrylate are mixed and added to the reactor. The temperature is controlled at 80℃ and the reaction is maintained for 1 hour. After filtration and spray drying, core-shell rubber particles are obtained.

[0048] Example 2: The preparation method of aminated modified boron nitride nanoparticles includes the following steps:

[0049] A1: Place the nano-boron nitride in a reaction vessel with a 5 mol / L sodium hydroxide solution, control the temperature at 90℃, and keep the reaction at that temperature for 4.5 h. After washing and drying, hydroxylated boron nitride is obtained.

[0050] A2: Add 10g of hydroxylated boron nitride, 1.5g of KH550, 80mL of anhydrous ethanol and 20mL of deionized water to a reaction vessel, control the temperature at 55℃ and treat for 3h, wash and dry to obtain amino-modified nano boron nitride.

[0051] The preparation method of core-shell rubber particles includes the following steps:

[0052] S1: In a nitrogen atmosphere, 100 mL of deionized water and 0.4 g of sodium dodecyl sulfate were added to the reaction vessel and dispersed. 60 g of butyl acrylate, 30 g of ethylhexyl acrylate and 0.4 g of divinylbenzene were mixed and added to the reaction vessel. The temperature was controlled at 75 °C. 0.2 g of potassium persulfate was added and the reaction was carried out for 4.5 h to obtain component one.

[0053] S2: Control the temperature of component one at 70℃, add 9g of methyl methacrylate, 1g of styrene and 0.4g of allyl methacrylate into the reactor, keep the temperature at 70℃ for 1 hour, control the temperature at 80℃ and keep the temperature at 80℃ for 2 hours to obtain component two.

[0054] S3: Component 2 is controlled at 80℃. 0.5g of hydroxyethyl methacrylate and 0.3g of ethylene glycol dimethacrylate are mixed and added to the reaction vessel. The temperature is controlled at 80℃ and the reaction is maintained for 2 hours. After filtration and spray drying, core-shell rubber particles are obtained.

[0055] Example 3: The preparation method of aminated modified boron nitride nanoparticles includes the following steps:

[0056] A1: Place the nano-boron nitride in a reaction vessel with a 5 mol / L sodium hydroxide solution, control the temperature at 95℃, keep the reaction at this temperature for 6 h, wash and dry to obtain hydroxylated boron nitride;

[0057] A2: Add 10g of hydroxylated boron nitride, 2g of KH550, 80mL of anhydrous ethanol and 20mL of deionized water to a reaction vessel, control the temperature at 60℃ and treat for 4h, wash and dry to obtain amino-modified nano boron nitride.

[0058] The preparation method of core-shell rubber particles includes the following steps:

[0059] S1: In a nitrogen atmosphere, 150 mL of deionized water and 0.5 g of sodium dodecyl sulfate were added to the reaction vessel and dispersed. 70 g of butyl acrylate, 20 g of ethylhexyl acrylate and 0.5 g of divinylbenzene were mixed and added to the reaction vessel. The temperature was controlled at 80 °C. 0.2 g of potassium persulfate was added and the reaction was carried out for 6 h to obtain component one.

[0060] S2: Component 1 is kept at a temperature of 70℃. 10.8g of methyl methacrylate, 1.2g of styrene and 0.6g of allyl methacrylate are mixed and added to the reactor. The mixture is kept at this temperature for 2 hours. Then, the mixture is kept at a temperature of 80℃ for 4 hours to obtain Component 2.

[0061] S3: Component 2 is controlled at 80℃. 0.96g of hydroxyethyl methacrylate and 0.36g of ethylene glycol dimethacrylate are mixed and added to the reactor. The temperature is controlled at 85℃ and the reaction is maintained for 3 hours. After filtration and spray drying, core-shell rubber particles are obtained.

[0062] Example 4 The coating comprises the following raw materials in weight percentage: 55% flexible polyether polyurethane acrylate (purchased from Bomar, grade BR-582E8), 35% perfluoropolyether modified acrylate (purchased from Silibase, grade FS-4110), 7% aminated modified nano boron nitride prepared in Example 1, 0.2% polyacrylate dispersant (BYK-190), 0.5% acrylate modified fluorinated surfactant (purchased from Chemours, grade FC-350Capstone®FS-22), 1% KH-550, 0.8% photoinitiator (Irgacure 819), and 0.5% auxiliary initiator (Irgacure 184).

[0063] The adhesive comprises the following raw materials by weight percentage: 65% polyurethane acrylate resin (polyether-type difunctional polyurethane acrylate, purchased from Shanghai Runao Chemical, brand name LuCure8722), 12% core-shell rubber particles prepared in Example 1, 6.5% acrylate-terminated polydimethylsiloxane prepared in Example 1, 9% reactive diluent (methoxy polyethylene glycol acrylate, purchased from Hubei Kanos, brand name MPEGA600), 5% adhesion promoter (purchased from Evonik, brand name VISIOMER®HEMA-P100), 2.2% photoinitiator (Irgacure TPO), and 0.3% light stabilizer (purchased from BASF, brand name light stabilizer 119FDL).

[0064] A method for preparing a spider web-like optical fiber ribbon cable includes the following steps:

[0065] Eight spiderweb-structured hollow optical fibers, each coated with a 28µm thick layer as described above, were placed in an arrangement mold with spacing between them. The gaps were filled with the adhesive prepared above. The mixture was then subjected to a temperature of 50°C and a pressure of 500 mJ / cm². 2 Exposure and curing process is used to obtain hollow fiber ribbon units;

[0066] Wrap the hollow fiber ribbon unit around the central reinforcement;

[0067] An aerogel buffer layer and an aramid fiber braided layer are sequentially wrapped around the outside of the hollow fiber ribbon unit, and then a polyethylene sheath layer is extruded to obtain a spider web fiber ribbon cable.

[0068] Example 5: Compared with Example 4, the coating layer is only modified by replacing the aminated modified boron nitride nanoparticles prepared in Example 1 with an equal amount of the aminated modified boron nitride nanoparticles prepared in Example 2. The other components and preparation methods are completely the same as those in Example 4.

[0069] Compared with Example 4, the adhesive is only replaced with an equal amount of the core-shell rubber particles prepared in Example 1, which were added in Example 4, and the rest of the components and preparation methods are completely the same as those in Example 4.

[0070] A method for preparing a spider web fiber ribbon cable, compared with Example 4, only replaces the coating layer and adhesive used in Example 4 with the coating layer and adhesive prepared in Example 5 in equal amounts, while the remaining components and preparation methods are completely the same as in Example 4.

[0071] Example 6: Compared with Example 4, the coating layer is only modified by replacing the aminated modified boron nitride nanoparticles prepared in Example 1 with an equal amount of the aminated modified boron nitride nanoparticles prepared in Example 3. The other components and preparation methods are completely the same as in Example 4.

[0072] Compared with Example 4, the adhesive is only replaced with an equal amount of the core-shell rubber particles prepared in Example 1, which were added in Example 4, and the rest of the components and preparation methods are completely the same as those in Example 4.

[0073] A method for preparing a spider web fiber ribbon cable, compared with Example 4, only replaces the coating layer and adhesive used in Example 4 with the coating layer and adhesive prepared in Example 6 in equal amounts, while the remaining components and preparation methods are completely the same as in Example 4.

[0074] Comparative Example 1: The preparation method of hydroxylated boron nitride includes the following steps:

[0075] Nano-sized boron nitride was placed in a reaction vessel with a 5 mol / L sodium hydroxide solution, and the temperature was controlled at 90℃ for 4.5 h. After washing and drying, hydroxylated boron nitride was obtained.

[0076] The preparation method of core-shell rubber particles includes the following steps:

[0077] S1: In a nitrogen atmosphere, 100 mL of deionized water and 0.4 g of sodium dodecyl sulfate were added to the reaction vessel and dispersed. 60 g of butyl acrylate, 30 g of ethylhexyl acrylate and 0.4 g of divinylbenzene were mixed and added to the reaction vessel. The temperature was controlled at 75 °C. 0.2 g of potassium persulfate was added and the reaction was carried out for 4.5 h to obtain component one.

[0078] S2: Component 1 is kept at a controlled temperature of 70℃. 9g of methyl methacrylate, 1g of styrene, and 0.4g of allyl methacrylate are mixed and added to the reactor. The mixture is kept at this temperature for 1 hour. Then, the mixture is kept at a controlled temperature of 80℃ for 2 hours. The mixture is then filtered and spray-dried to obtain core-shell rubber particles.

[0079] Compared with Example 5, the coating of Comparative Example 2 was only replaced by an equal amount of the aminated modified boron nitride nanoparticles prepared in Example 2, which were added in Example 5, with the hydroxylated boron nitride prepared in Comparative Example 1. The other components and preparation methods were completely the same as those of Example 5.

[0080] The adhesive is exactly the same as in Example 5.

[0081] A method for preparing a spider web fiber ribbon cable, compared with Example 5, only the coating layer used in Example 5 is replaced with the coating layer of Comparative Example 2, and the remaining components and preparation methods are completely the same as in Example 5.

[0082] The coating of Comparative Example 3 is completely identical to that of Example 5.

[0083] Compared with Example 5, the adhesive is only replaced by an equal amount of the core-shell rubber particles prepared in Example 2, which were added in Example 5, with the core-shell rubber particles prepared in Comparative Example 1. The other components and preparation methods are completely the same as in Example 5.

[0084] A method for preparing a spider web fiber optic cable, compared with Example 5, only the adhesive in Example 5 is replaced in equal amounts with the coating layer prepared in Comparative Example 3, and the remaining components and preparation methods are completely the same as in Example 5.

[0085] The coating of Comparative Example 4 is completely identical to that of Example 5.

[0086] Compared with Example 5, the adhesive was modified by replacing the acrylate-terminated polydimethylsiloxane prepared in Example 1 with an equal amount of the polyurethane acrylate resin added in Example 5. The remaining components and preparation methods were completely consistent with those of Example 5.

[0087] A method for preparing a spider web fiber optic cable, compared with Example 5, only the adhesive used in Example 5 is replaced in equal amounts with the adhesive prepared in Comparative Example 4, and the remaining components and preparation methods are completely the same as in Example 5.

[0088] Performance testing

[0089] (1) Interface peel strength: The peel strength between the coating layer and the adhesive was tested by a 90° peel test at a rate of 50 mm / min. The test results are shown in Table 1.

[0090] (2) Delamination rate after damp heat aging: After aging at 85℃ / 85%RH for 1000h, the delamination area ratio was observed, and the test results are shown in Table 1;

[0091] Table 1: Statistical Table of Interface Bonding Performance Test Data for Examples 4-6 and Comparative Examples 2-4

[0092] Peel strength (N / cm) Delamination area percentage / % Example 4 4.3 1.1 Example 5 4.4 1.0 Example 6 4.3 1.2 Comparative Example 2 3.8 5.2 Comparative Example 3 3.5 3.5 Comparative Example 4 1.8 25.1

[0093] As shown in Table 1, the adhesive and coating prepared in this application have high interfacial bonding strength and maintain excellent interfacial bonding strength even under high humidity and high temperature conditions.

[0094] (3) Transverse extrusion strength: The additional loss at 23℃ and wavelength of 1550nm before and after extrusion at 1500N / 100mm is measured. The test results are shown in Table 2.

[0095] (4) Bending loss: The optical fiber was wound around a core with a radius of 10 mm and bent 100 times. The additional loss at 23℃ and wavelength of 1550 nm before and after the test was measured. The test results are shown in Table 2.

[0096] (5) Loss change rate after temperature cycling: After cycling 200 times at -40℃ to 85℃, the additional loss change rate at 1550nm wavelength at 23℃ before and after testing is shown in Table 2.

[0097] Table 2: Performance Test Data Statistics of Examples 4-6 and Comparative Examples 2-4

[0098] Additional losses (dB / km) Bending loss (dB / km) Loss change rate after temperature cycling / % Example 4 0.02 0.03 3.2 Example 5 0.02 0.02 3.1 Example 6 0.03 0.03 3.4 Comparative Example 2 0.15 0.12 8.5 Comparative Example 3 0.08 0.10 6.1 Comparative Example 4 0.06 0.09 19.2

[0099] As shown in Table 2, the adhesive and coating prepared in this application can effectively reduce the optical signal loss of the optical cable under external stress and high temperature difference, thus maintaining the long-term reliability of the optical cable.

[0100] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A spider web-like fiber optic ribbon cable, characterized in that, The spider web fiber ribbon cable is composed of at least a central strengthening member, a hollow fiber ribbon unit, a protective unit, and a sheath layer; the hollow fiber ribbon unit surrounds the outside of the central strengthening member, the protective unit surrounds and covers the outside of the hollow fiber ribbon unit, and the sheath layer wraps around the outside of the protective unit. The hollow fiber ribbon unit is obtained by fixing multiple spider web-structured hollow fibers with coated surfaces using an adhesive. The adhesive comprises the following raw materials by weight percentage: 58%-68% polyurethane acrylate resin, 10-15% core-shell rubber particles, 5-8% acrylate-terminated polydimethylsiloxane, 8%-12% reactive diluent, 4%-6% adhesion promoter, 2%-3% photoinitiator, and 0.2%-0.5% light stabilizer, the sum of the raw material weight percentages being 100%. The preparation method of core-shell rubber particles includes the following steps: S1: In a nitrogen atmosphere, deionized water and sodium dodecyl sulfate are added to the reactor for dispersion. The core layer monomer and divinylbenzene are then mixed and added to the reactor. The temperature is controlled at 70-80℃. Potassium persulfate is added, and the reaction is carried out for 3-6 hours to obtain component one. S2: Control the temperature of component one at 65-70℃, add the shell monomer and allyl methacrylate to the reaction vessel, keep the temperature for 1-2 hours, control the temperature at 75-80℃ and keep the temperature for 2-4 hours to obtain component two. S3: Control the temperature of component two at 75-80℃, add hydroxyethyl methacrylate and ethylene glycol dimethacrylate into the reactor, control the temperature at 80-85℃, keep the reaction at this temperature for 1-3 hours, filter and spray dry to obtain core-shell rubber particles.

2. The spider web fiber optic ribbon cable according to claim 1, characterized in that, The core layer monomer in S1 is composed of butyl acrylate and ethylhexyl acrylate in a mass ratio of 60-70:20-30; the addition ratio of deionized water, sodium dodecyl sulfate, core layer monomer, divinylbenzene, and potassium persulfate is 100-150mL:0.3-0.5g:60-90g:0.3-0.5g:0.1-0.2g.

3. The spider web fiber optic ribbon cable according to claim 1, characterized in that, The shell monomer in S2 is composed of methyl methacrylate and styrene in a mass ratio of 8.5-9:1; The amount of shell monomer added accounts for 8%-15% of the total mass of core monomer; allyl methacrylate accounts for 3-5% of the total mass of shell monomer.

4. The spider web fiber optic ribbon cable according to claim 1, characterized in that, In S3, the amount of hydroxyethyl methacrylate added accounts for 2%-8% of the total mass of the shell monomers; the amount of ethylene glycol dimethacrylate added accounts for 0.5%-3% of the total mass of the shell monomers.

5. The spider web fiber optic ribbon cable according to claim 1, characterized in that, The preparation method of the acrylate-terminated polydimethylsiloxane includes the following steps: In a nitrogen atmosphere, hydrogen-containing polydimethylsiloxane, toluene, and hydroquinone were dispersed in a reaction vessel and the temperature was controlled at 60-70℃. Hydroxyethyl acrylate was added and the mixture was kept at this temperature for 1-2 hours. Isopropanol chloroplatinate solution was then added to the reaction vessel and the temperature was controlled at 80-100℃. The mixture was kept at this temperature for 5-6 hours. The mixture was then distilled under reduced pressure, cooled to room temperature, and filtered to obtain acrylate-terminated polydimethylsiloxane.

6. The spider web fiber optic ribbon cable according to claim 1, characterized in that, The coating comprises the following raw materials by weight percentage: 50%-60% flexible polyether polyurethane acrylate, 30%-40% perfluorinated polyether modified acrylate, 5%-8% aminated modified nano boron nitride, 0.2%-0.3% polyacrylate dispersant, 0.5%-1% acrylate modified fluorinated surfactant, 1%-2% KH-550, 0.8-1% photoinitiator, and 0.2%-0.5% auxiliary initiator, the sum of the raw material weight percentages being 100%.

7. A spider web-like fiber optic ribbon cable according to claim 6, characterized in that, The preparation method of amination-modified boron nitride nanoparticles includes the following steps: Hydroxylated boron nitride, KH550, anhydrous ethanol, and deionized water were added to a reaction vessel, and the temperature was controlled at 50-60℃ for 2-4 hours. After washing and drying, amino-modified nano boron nitride was obtained.

8. A spider web-like fiber optic ribbon cable according to claim 7, characterized in that, The preparation method of the hydroxylated boron nitride includes the following steps: adding nano boron nitride and sodium hydroxide solution to a reaction vessel, controlling the temperature at 90-95℃, keeping the reaction at this temperature for 3-6 hours, washing and drying to obtain hydroxylated boron nitride; The addition ratio of hydroxylated boron nitride, KH550, anhydrous ethanol, and deionized water is 10g: 1-2g: 40-80mL: 10-20mL.

9. A spider web-like fiber optic ribbon cable according to claim 1, characterized in that, The protective unit includes an aerogel buffer layer wrapped around the surface of the hollow fiber ribbon unit and an aramid fiber braided layer circumferentially distributed on the outer surface of the aerogel buffer layer.

10. A method for preparing a spider web-like optical fiber ribbon cable according to any one of claims 1-9, characterized in that, The process includes the following steps: placing spider web-structured hollow fiber clad with a coating layer on its surface into an arrangement mold, spacing them apart, filling the gaps with adhesive, and curing the mixture to obtain hollow fiber ribbon units; Wrap the hollow fiber ribbon unit around the central reinforcement; A protective unit and a sheath layer are sequentially wrapped around the outside of the hollow fiber ribbon unit to obtain a spider web fiber ribbon cable.