Salt-resistant nylon cable fiber for deep sea operation and preparation method thereof

Abstract

The application discloses a kind of special nylon cable fiber of salt corrosion resistance of deep sea operation and preparation method thereof, including core layer and sheath layer, it is characterized in that, the mass ratio of core layer and sheath layer is 7:3;The core layer raw material includes: nylon 6 chip 88-92 parts, hyperbranched nylon toughening agent 2-4 parts, nano calcium carbonate whisker precursor 1-2 parts, high-pressure modifier 0.5-1 part, initiator 0.2-0.4 part;The sheath layer raw material includes: nylon 66 / polybutylene terephthalate blend chip 80-85 parts, silicon carbide powder 4-6 parts, sepiolite nanofiber 2-3 parts, seawater resistant modifier 1-2 parts, compatible agent 0.5-1 part, the special nylon cable fiber of salt corrosion resistance of deep sea operation and preparation method thereof disclosed in the application can tolerate the abrasion, extrusion, scratch of seabed rock, simultaneously has the characteristics of seawater corrosion resistance, deep sea high pressure resistance, low temperature fatigue resistance.

Description

Technical Field

[0001] This invention relates to the field of marine engineering fiber materials technology, and in particular to a salt-resistant nylon cable fiber for deep-sea operations and its preparation method. Background Technology

[0002] As a key component in marine resource development, deep-sea operation cables face the challenge of complex abrasion from seabed rocks. During operation, the cables are in continuous contact with seabed reefs, rock surfaces, and rock edges, enduring multiple effects such as sliding abrasion, point compression, and scraping from hard edges. At the same time, they must resist corrosion from high-salt seawater, embrittlement at temperatures below -20°C, and the degradation of mechanical properties under high pressure in the deep sea.

[0003] Nylon fiber has become the mainstream raw material for deep-sea cables due to its high specific strength, high elastic recovery rate and excellent fatigue resistance. However, pure nylon fiber has inherent performance defects: low surface hardness, poor resistance to abrasive wear, and easy to cause surface fuzzing and internal filament breakage when in contact with rocks. Summary of the Invention

[0004] This invention discloses a salt-resistant nylon cable fiber for deep-sea operations and its preparation method, aiming to solve the inherent performance defects of pure nylon fiber: low surface hardness, poor resistance to abrasive wear, and easy surface fuzzing and internal fiber breakage when in contact with rocks.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A salt-resistant nylon cable fiber for deep-sea operations, comprising a core layer and a sheath layer, wherein the mass ratio of the core layer to the sheath layer is 7:3; The core layer raw materials include: 88-92 parts of nylon 6 chips, 2-4 parts of hyperbranched nylon toughening agent, 1-2 parts of nano-calcium carbonate whisker precursor, 0.5-1 parts of high-pressure modifier, and 0.2-0.4 parts of initiator; The sheath material includes: 80-85 parts of nylon 66 / polybutylene terephthalate blend chips, 4-6 parts of silicon carbide micro powder, 2-3 parts of sepiolite nanofibers, 1-2 parts of seawater resistant modifier, and 0.5-1 parts of compatibilizer.

[0006] A method for preparing salt-resistant nylon cable fibers for deep-sea operations includes the following specific steps: S1: raw material pretreatment; S2: core layer melt preparation; S3: sheath layer melt preparation; S4: core-sheath double-layer composite melt spinning; S5: high-pressure steam three-stage hot stretching and setting; S6: surface densification post-treatment. S1 includes the following specific steps: S11: Nylon 6 chips and nylon / nylon 66 / polybutylene terephthalate blend chips are placed in a vacuum drying oven, wherein the nylon 6 chips are dried at 95-100℃ for 8 hours, and the nylon / nylon 66 / polybutylene terephthalate blend chips are dried at 85-90℃ for 10 hours, controlling the moisture content to ≤250ppm to prevent bubbles from forming during melt spinning; S12: Silicon carbide micro powder is ultrasonically cleaned with 15% dilute hydrochloric acid for 2 hours. After removing surface impurities, the mixture is dried at 80℃ and then mixed with a seawater resistant modifier at a mass ratio of 8:1. The mixture is stirred at 3500 rpm for 40 minutes and then dried at 110℃ to improve the interfacial bonding with the sheath matrix. S13: Sepiolite nanofibers are dispersed by high-speed shearing and then mixed with a compatibilizer at a mass ratio of 10:1. The mixture is stirred at room temperature for 30 minutes and set aside. S14: Nano-calcium carbonate whisker precursor, high-pressure resistant modifier, and initiator are vacuum dried at 60℃ for 4 hours and set aside. S2 includes the following specific steps: S21: The pretreated nylon 6 chips are fed into a twin-screw extruder and melted in stages with controlled temperature: Zone 1 235-245℃, Zone 2 245-255℃, Zone 3 255-260℃, Zone 4 250-255℃, screw speed 35-40 rpm, melting for 5 minutes until the melt is homogeneous; S22: An initiator and a hyperbranched nylon toughening agent are added and mixed for 2 minutes to achieve molecular linking and branching modification of nylon 6 and introduce active hydroxyl groups; S23: Then add nano-calcium carbonate whisker precursor and high-pressure modifier, heat to 260-265℃, and knead at low speed for 4-5 minutes. Utilize the high temperature and high pressure environment inside the extruder to allow the precursor to grow in situ into nano-calcium carbonate whiskers in the nylon matrix, forming a three-dimensional whisker-reinforced network; S24: Filter the melt through a 120-mesh high-precision filter to remove a small amount of unreacted precursor, obtaining the core layer melt. Maintain the temperature at 255-260℃, and control the melt viscosity at 1100-1300 Pa·s, for later use. S3 includes the following specific steps: S31: The pretreated nylon 66 / polybutylene terephthalate blend chips are fed into a dedicated single-screw extruder and melted in stages with controlled temperature: Zone 1 240-250℃, Zone 2 250-260℃, Zone 3 260-265℃, screw speed 25-30 rpm, melting for 4 minutes; S32: A compatibilizer is added and mixed for 1.5 minutes to improve the compatibility of nylon 66 and PBT and prevent phase separation; S33: Then, the following are added sequentially... Modified silicon carbide micropowder and sepiolite nanofibers are mixed in a single-screw extruder at a screw speed of 20-25 rpm and a melt pressure of 18-20 MPa for 3-4 minutes to form a dynamic cross-linked network between the silicon carbide micropowder, sepiolite nanofibers and the blend matrix; S34: The melt is filtered through a 100-mesh filter to obtain the sheath melt, which is kept at a temperature of 250-255℃ and the melt viscosity is controlled at 900-1100 Pa·s to achieve a viscosity gradient connection with the core melt, and is ready for use; S4 includes the following specific steps: S41: The core layer melt and sheath layer melt are injected into the core-sheath double-layer composite spinning assembly simultaneously through independent melt pumps at a mass ratio of 7:3. The core layer melt flows through the central channel, and the sheath layer melt flows through the outer ring channel. The overall temperature of the spinning assembly is controlled at 250-255℃, and the total melt pressure is 15-17MPa; S42: The melt is coaxially extruded through a double-layer special spinneret and cooled by constant temperature and humidity side blowing to avoid internal stress and interlayer delamination caused by the difference in cooling rate between the core and sheath layers. The nascent fibers are drawn by the guide roller at a speed of 900-1000m / min to obtain core-sheath double-layer nascent fibers; S5 includes the following specific steps: S51: The nascent fiber is placed in a high-pressure steam stretching device, using saturated steam as the heat medium, and subjected to three-stage hot stretching: first-stage stretching temperature 90-95℃, steam pressure 0.2MPa, stretching ratio 1.7-1.9 times; second-stage stretching temperature 125-135℃, steam pressure 0.3MPa, stretching ratio 1.4-1.6 times; third-stage stretching temperature 155-165℃, steam pressure 0.4MPa, stretching ratio 1.3-1.4 times, and total stretching ratio 3.8-4.2 times; S52: The stretched fiber is heat-set under 170-180℃ and 0.5MPa high-pressure steam for 6-8 seconds to improve fiber crystallinity and core-sheath interlayer bonding force, with a winding speed of 4200-4600m / min, to obtain a core-sheath double-layer pre-finished fiber; S6 includes the following specific steps: S61: Place the pre-finished fiber in a sealed treatment tank, introduce hexamethyldisilazane vapor, control the treatment temperature at 110-120℃ and the pressure at 0.3-0.4MPa, and react for 2-3 hours to form a dense silazane hydrophobic film on the fiber surface; S62: After the reaction is completed, take out the fiber, vacuum dry it at 80-90℃ for 5 hours to remove residual vapor, and obtain the rock-resistant deep-sea operation special nylon cable fiber.

[0007] Compared with the prior art, the present invention provides a salt-resistant nylon cable fiber for deep-sea operations and its preparation method, which has the following beneficial effects: 1. This salt-corrosion-resistant nylon cable fiber for deep-sea operations achieves a synergistic performance division and coordination of "high inner toughness and load-bearing capacity, and outer wear-resistant and corrosion-resistant properties" through a core-sheath dual-layer functional differentiation structure design. Existing technologies all involve homogeneous fiber modification, which cannot simultaneously meet the performance requirements of wear resistance and high toughness. Wear-resistant modification can easily lead to increased fiber brittleness. This invention innovatively designs a core-sheath dual-layer structure, with the core layer using nylon 6 as the matrix, emphasizing high toughness, high pressure resistance, and low-temperature fatigue resistance, providing the core for the cable fiber. With its load-bearing capacity, it is suitable for use in deep-sea high-pressure environments and cable bending scenarios. The sheath layer uses nylon 66 / PBT blend as the matrix, focusing on wear resistance, corrosion resistance, and abrasion resistance. As the outer protective layer of the fiber, it directly resists rock abrasion and seawater corrosion. The core-sheath 7:3 mass ratio ensures the main load-bearing function of the core layer while allowing the sheath layer to form a complete and dense protective layer. Moreover, both the core and sheath matrix are nylon-based, with good molecular structure compatibility, avoiding interlayer delamination and achieving a synergistic performance of "inner strength and outer protection".

[0008] 2. This salt-resistant nylon cable fiber for deep-sea operations is based on a nylon 66 / PBT blend matrix design in the sheath layer. It overcomes the limitations of single nylon matrices in terms of wear resistance and corrosion resistance. Existing technologies use single nylon 6 or nylon 66 as the matrix, resulting in low wear resistance and poor resistance to seawater swelling. This invention uses a nylon 66 / PBT blend matrix in the sheath layer, leveraging the high crystallinity and surface hardness of PBT to enhance the sheath layer's resistance to abrasive wear. Simultaneously, the hydrophobic properties of PBT reduce the contact area between seawater and the matrix, minimizing amide group complexation reactions. Nylon 66 ensures molecular compatibility between the sheath layer and the core layer of nylon 6, preventing interfacial gaps between the blend matrix and the core layer. This blend matrix design achieves a triple effect of "enhanced wear resistance and hardness, improved seawater corrosion resistance, and stable compatibility with the core layer," fundamentally different from existing single nylon matrix technologies.

[0009] 3. This method for preparing salt-resistant nylon cable fibers for deep-sea operations is based on the in-situ growth of nano-calcium carbonate whiskers in the core melt to construct a three-dimensional reinforcing network, achieving a synergistic improvement in high toughness and high pressure resistance. Existing technologies mostly use the direct addition of whiskers / fibers to reinforce the nylon matrix, which suffers from poor whisker dispersion and weak bonding with the matrix. This invention innovatively utilizes the high-temperature and high-pressure environment of a twin-screw extruder during the core melt preparation process to allow the nano-calcium carbonate whisker precursor to grow in situ in the nylon matrix. The generated whiskers are one-dimensional nanostructures that can be uniformly dispersed in the matrix to form a three-dimensional reinforcing network. On the one hand, this disperses local stress under deep-sea high pressure, improving the fiber's high-pressure resistance; on the other hand, it works synergistically with hyperbranched nylon toughening agents to improve the toughness and low-temperature fatigue resistance of the core layer, solving the dispersion and bonding problems of traditional externally added whiskers and achieving "molecular-level uniformity" of matrix reinforcement.

[0010] 4. This method for preparing salt-resistant nylon rope fibers for deep-sea operations is based on a high-pressure steam hot stretching and setting process. This process simultaneously improves fiber crystallinity and the bonding strength between the core and sheath layers, making it suitable for the high-pressure environment of the deep sea. Existing technologies all use conventional hot air stretching and setting, resulting in low fiber crystallinity and weak bonding between the core and sheath layers due to only physical adhesion. This invention innovatively uses high-pressure steam as the heat medium for stretching and setting. The high heat transfer efficiency of saturated steam allows for rapid and uniform heating within the fiber, significantly improving fiber crystallinity and enhancing its mechanical properties and dimensional stability. Simultaneously, the pressure of the high-pressure steam allows the molten molecular chains between the core and sheath layers to fully entangle and diffuse, achieving a "fusion bond" between the core and sheath layers. Furthermore, the fibers set by high-pressure steam will not undergo structural deformation due to pressure differences in the high-pressure environment of the deep sea, perfectly adapting to the high-pressure operating scenarios of the deep sea. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of a salt-resistant nylon cable fiber for deep-sea operations proposed in this invention.

[0012] Figure 2 This is a schematic diagram of the cover plate structure for a method of preparing salt-resistant nylon cable fiber for deep-sea operations proposed in this invention.

[0013] In the diagram: 1. Core layer; 2. Sheath layer. Detailed Implementation

[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0015] The present invention discloses a salt-resistant nylon cable fiber for deep-sea operations and its preparation method, which is mainly used in deep-sea operations.

[0016] Example 1 A rock-resistant nylon cable fiber for deep-sea operations, comprising the following core layer materials by weight: 90 parts nylon 6 chips, 3 parts hyperbranched nylon toughening agent, 1.5 parts nano-calcium carbonate whisker precursor, 0.8 parts high-pressure modifier, and 0.3 parts initiator; and the following sheath layer materials by weight: 82 parts nylon 66 / PBT blend chips, 5 parts silicon carbide micro powder, 2.5 parts sepiolite nanofiber, 1.5 parts KH560, and 0.7 parts compatibilizer.

[0017] Its preparation method is as follows: 1. Raw material pretreatment: Nylon 6 chips were dried at 98℃ for 8 hours, and Nylon 66 / PBT blend chips were dried at 88℃ for 10 hours, with a moisture content of ≤250ppm; Silicon carbide micro powder was ultrasonically cleaned with 15% dilute hydrochloric acid for 2 hours, modified with KH560 at a ratio of 8:1, and then dried at 110℃; Sepiolite nanofibers and compatibilizer were mixed at a ratio of 10:1 for later use; The remaining fillers were vacuum dried at 60℃ for 4 hours.

[0018] 2. Core layer melt preparation: Nylon 6 chips are fed into a twin-screw extruder and melted at 38 rpm for 5 min at 240℃ in zone 1, 250℃ in zone 2, 258℃ in zone 3, and 252℃ in zone 4. Initiator and toughening agent are added and mixed for 2 min. Then, precursor and high-pressure modifier are added and mixed at low speed at 262℃ for 4.5 min. The mixture is filtered through a 120-mesh filter and kept at 258℃ until the viscosity is 1200 Pa·s.

[0019] 3. Preparation of sheath melt: Nylon 66 / PBT blend chips were fed into a single-screw extruder and melted at 28 rpm for 4 min at 245℃ in zone 1, 255℃ in zone 2, and 262℃ in zone 3. Compatibilizer was added and kneaded for 1.5 min. Then silicon carbide micro powder and sepiolite nanofibers were added and dynamically crosslinked and kneaded at 22 rpm for 3.5 min. The mixture was filtered through a 100-mesh filter and kept at 252℃ until the viscosity reached 1000 Pa·s.

[0020] 4. Core-sheath composite spinning: The core-sheath melt is injected into the composite spinning assembly at a ratio of 7:3, with a temperature of 252℃ and a pressure of 16MPa; after spinning, the material is cooled by side blowing at 23℃, 62% humidity, and 0.7m / s, with a take-up speed of 950m / min.

[0021] 5. High-pressure steam stretching and setting: Level 1: 92℃, 0.2MPa, 1.8 times; Level 2: 130℃, 0.3MPa, 1.5 times; Level 3: 160℃, 0.4MPa, 1.35 times, with a total stretching ratio of 3.57 times; 175℃, 0.5MPa steam setting for 7 seconds, with a winding speed of 4400m / min.

[0022] 6. Surface densification post-treatment: Hexamethyldisilazane vapor is introduced at 115℃ and 0.35MPa for 2.5h and then vacuum dried at 85℃ for 5h to obtain the finished fiber.

[0023] The fiber prepared in this embodiment has a breaking strength of 10.8 cN / dtex, a breaking elongation of 40%, a rock abrasion loss of 0.05 mg / m, a strength retention rate of 95% after soaking in 3.5% NaCl for 120 days, no fiber breakage after bending 15,000 times at -25℃, and a strength retention rate of 98% under 100 MPa high pressure.

[0024] Example 2 A rock-resistant nylon cable fiber for deep-sea operations, comprising the following core layer materials by weight: 88 parts nylon 6 chips, 4 parts hyperbranched nylon toughening agent, 2 parts nano-calcium carbonate whisker precursor, 1 part high-pressure modifier, and 0.4 parts initiator; and the following sheath layer materials by weight: 80 parts nylon 66 / PBT blend chips, 6 parts silicon carbide micro powder, 3 parts sepiolite nanofibers, 2 parts KH560, and 1 part compatibilizer.

[0025] The preparation method is basically the same as in Example 1, except that the in-situ whisker growth and mixing time of the core layer is adjusted by 5 min, the dynamic crosslinking and mixing time of the sheath layer is adjusted by 4 min, and the high-pressure steam setting temperature is 180℃. The fiber prepared in this example has a breaking strength of 10.0 cN / dtex, a breaking elongation of 38%, a rock abrasion loss of 0.07 mg / m, a strength retention rate of 92% after 120 days of immersion in 3.5% NaCl, and no cracking after 15,000 bends at -25℃.

[0026] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A salt-resistant nylon cable fiber for deep-sea operations, comprising a core layer (1) and a sheath layer (2), characterized in that, The mass ratio of the core layer (1) to the sheath layer (2) is 7:3; The core layer (1) raw materials include: 88-92 parts of nylon 6 chips, 2-4 parts of hyperbranched nylon toughening agent, 1-2 parts of nano-calcium carbonate whisker precursor, 0.5-1 parts of high pressure modifier, and 0.2-0.4 parts of initiator; The raw materials of the sheath (2) include: 80-85 parts of nylon 66 / polybutylene terephthalate blend chips, 4-6 parts of silicon carbide micro powder, 2-3 parts of sepiolite nanofibers, 1-2 parts of seawater resistant modifier, and 0.5-1 parts of compatibilizer.

2. A method for preparing salt-resistant nylon cable fiber for deep-sea operations, used to prepare the salt-resistant nylon cable fiber for deep-sea operations as described in claim 1, characterized in that, The specific steps include the following: S1: Raw material pretreatment; S2: Core layer melt preparation; S3: Preparation of sheath melt; S4: Core-sheath double-layer composite melt spinning; S5: High-pressure steam three-stage heat stretching and setting; S6: Post-treatment for surface densification.

3. The method for preparing salt-resistant nylon cable fiber for deep-sea operations according to claim 2, characterized in that, S1 includes the following specific steps: S11: Place nylon 6 chips and nylon / nylon 66 / polybutylene terephthalate blend chips in a vacuum drying oven. The nylon 6 chips are dried at 95-100℃ for 8 hours, and the nylon / nylon 66 / polybutylene terephthalate blend chips are dried at 85-90℃ for 10 hours. The moisture content of both chips is controlled to be ≤250ppm. S12: Silicon carbide micro powder is ultrasonically cleaned with 15% dilute hydrochloric acid for 2 hours to remove surface impurities. After drying at 80℃, it is mixed with seawater resistant modifier at a mass ratio of 8:1, stirred at 3500rpm for 40 minutes, and dried at 110℃. S13: After high-speed shear dispersion, sepiolite nanofibers are mixed with a compatibilizer at a mass ratio of 10:1 and stirred at room temperature for 30 minutes for later use. S14: Nano-calcium carbonate whisker precursor, high-pressure modifier, and initiator were vacuum dried at 60℃ for 4 hours and then set aside.

4. The method for preparing salt-resistant nylon cable fiber for deep-sea operations according to claim 2, characterized in that, S2 includes the following specific steps: S21: Feed the pretreated nylon 6 chips into a twin-screw extruder and melt them in stages with controlled temperature: Zone 1 235-245℃, Zone 2 245-255℃, Zone 3 255-260℃, Zone 4 250-255℃, screw speed 35-40 rpm, melt for 5 minutes until the melt is homogeneous. S22: Add initiator and hyperbranched nylon toughening agent, mix for 2 minutes to achieve nylon 6 molecule linking branch modification and introduce active hydroxyl groups; S23: Add nano-calcium carbonate whisker precursor and high pressure modifier, heat to 260-265℃, and mix at low speed for 4-5 minutes. Utilize the high temperature and high pressure environment in the extruder to allow the precursor to grow in situ into nano-calcium carbonate whiskers in the nylon matrix, forming a three-dimensional whisker reinforcement network. S24: The melt is filtered through a 120-mesh high-precision filter to remove a small amount of unreacted precursors, resulting in the core layer melt. The holding temperature is 255-260℃, and the melt viscosity is controlled at 1100-1300 Pa·s. It is then ready for use.

5. The method for preparing salt-resistant nylon cable fiber for deep-sea operations according to claim 2, characterized in that, S3 includes the following specific steps: S31: The pretreated nylon 66 / polybutylene terephthalate blend chips are fed into a special single-screw extruder and melted in stages with controlled temperature: Zone 1 240-250℃, Zone 2 250-260℃, Zone 3 260-265℃, screw speed 25-30 rpm, melt for 4 min. S32: Add compatibilizer and mix for 1.5 minutes to improve the compatibility between nylon 66 and PBT; S33: Then add modified silicon carbide micro powder and sepiolite nanofiber in sequence. In a single screw extruder, reduce the screw speed to 20-25 rpm and control the melt pressure at 18-20 MPa. Mix for 3-4 minutes to form a dynamic cross-linked network between the silicon carbide micro powder, sepiolite nanofiber and the blend matrix. S34: The melt is filtered through a 100-mesh filter to obtain the sheath melt. The holding temperature is 250-255℃, and the melt viscosity is controlled at 900-1100 Pa·s to achieve viscosity gradient connection with the core melt. It is ready for use.

6. The method for preparing salt-resistant nylon cable fiber for deep-sea operations according to claim 2, characterized in that, S4 includes the following specific steps: S41: The core layer melt and sheath layer melt are injected into the core-sheath double-layer composite spinning assembly simultaneously through independent melt pumps at a mass ratio of 7:

3. The core layer melt flows through the central channel, and the sheath layer melt flows through the outer ring channel. The overall temperature of the spinning assembly is controlled at 250-255℃, and the total melt pressure is 15-17MPa. S42: The molten material is coaxially extruded through a double-layer special spinneret and cooled by a constant temperature and humidity side-blowing air. The nascent fibers are drawn in by the guide roller at a speed of 900-1000m / min to obtain a core-sheath double-layer nascent fiber.

7. The method for preparing salt-resistant nylon cable fiber for deep-sea operations according to claim 2, characterized in that, S5 includes the following specific steps: S51: The nascent fibers are placed in a high-pressure steam stretching device, using saturated steam as the heat medium, and subjected to three-stage hot stretching: the first stage stretching temperature is 90-95℃, the steam pressure is 0.2MPa, and the stretching ratio is 1.7-1.9 times; the second stage stretching temperature is 125-135℃, the steam pressure is 0.3MPa, and the stretching ratio is 1.4-1.6 times; the third stage stretching temperature is 155-165℃, the steam pressure is 0.4MPa, and the stretching ratio is 1.3-1.4 times, with a total stretching ratio of 3.8-4.2 times. S52: The stretched fiber is heat-set at 170-180℃ and 0.5MPa high-pressure steam for 6-8s, and wound at a speed of 4200-4600m / min to obtain a core-sheath double-layer pre-finished fiber.

8. The method for preparing salt-resistant nylon cable fiber for deep-sea operations according to claim 2, characterized in that, S6 includes the following specific steps: S61: Place the pre-finished fiber in a sealed treatment tank, introduce hexamethyldisilazane vapor, control the treatment temperature at 110-120℃ and the pressure at 0.3-0.4MPa, and react for 2-3 hours to form a dense silazane hydrophobic film on the fiber surface. S62: After the reaction is complete, the fiber is taken out and vacuum dried at 80-90℃ for 5 hours to remove residual steam, thus obtaining the rock-resistant nylon cable fiber for deep-sea operations.

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