阅读说明：本技术 一种镍金属牢固附着芳香族特种纤维长丝的连续生产工艺 (Continuous production process for nickel metal firmly-attached aromatic special fiber filament ) 是由 孙海通 马騻 于 2021-07-30 设计创作，主要内容包括：本发明公开了一种使镍金属牢固附着芳香族特种纤维长丝的连续性生产工艺,本发明是一种连续24小时生产如芳纶、PBO纤维、聚酰亚胺纤维等芳香族特种纤维镀镍的方法,它首先解决了高强度纤维金属化不能走出实验室,不能生产稳定的参数一致长纤维丝一次生产几千米以上的问题；同时由于生产速度以及各种化学电镀的参数可控性,解决了纤维丝相同长度,要求的导电性能不同以及镀层厚度不同的难题；在解决了量产化问题的同时又兼顾了生产出的芳纶,PBO纤,聚酰亚胺纤维镀镍金属镀层的耐摩擦、耐老化技术难题。(The invention discloses a continuous production process for firmly attaching nickel metal to an aromatic special fiber filament, which is a method for continuously plating nickel on aromatic special fibers such as aramid fibers, PBO fibers, polyimide fibers and the like within 24 hours, and solves the problems that high-strength fiber metallization cannot be taken out of a laboratory, and stable parameter-consistent filament yarns cannot be produced to produce more than thousands of meters at one time; meanwhile, due to the controllability of the production speed and various chemical plating parameters, the problems of the same length of the fiber yarn, different required conductivity and different plating layer thicknesses are solved; the problems of mass production are solved, and the technical problems of friction resistance and aging resistance of the produced nickel-plated metal coatings of aramid fibers, PBO fibers and polyimide fibers are solved.)

1. A continuous production process for firmly attaching nickel metal to an aromatic special fiber filament is carried out under an automatic assembly line with a set subslot length and a set speed, and is characterized by comprising the following steps of: (1) alkaline cleaning: enabling the fibers to pass through a sodium hydroxide solution with the mass fraction of 3-10%, and adding ultrasonic oscillation, wherein the time is 2 minutes, and the temperature is 40-60 ℃; (2) overflow washing; (3) coarsening: the composite material comprises a concentrated sulfuric acid solution containing 40g/L of WN-LL213 expanding agent and 60% -80% of the mass fraction, wherein the temperature is 30-40 ℃, the time is 30 seconds, mechanical vibration is assisted, the amplitude is 3.5cm, and the vibration frequency is 30-200 times/min; (4) overflow washing; (5) surface conditioning: 100g/L WN-Pd2020 surface conditioning agent solution, the temperature is 30 ℃, the time is 2 minutes, and ultrasonic waves are assisted; (6) overflow washing; (7) pre-activation: 10-30mL/L hydrochloric acid, the temperature is 30 ℃, and the time is 1 minute; (8) pre-palladium: 30-50ppm of colloidal palladium solution Coppermerseinstance catalysis AF, 12g/L of stannous chloride, 250-300mL/L of hydrochloric acid, 35 ℃ of temperature and 5 minutes of time, and uniformly attaching colloidal palladium by segmented ultrasonic waves; (9) carrying out overflow washing on pure water for three times; (10) and (3) gel releasing: adding a sulfuric acid solution with the mass fraction of 15%, and oscillating by ultrasonic waves at the temperature of 60 ℃ for 1 minute; (11) overflow washing; (12) chemical copper: adding intermittent ultrasonic oscillation at the temperature of 55 ℃ for 8 minutes, and setting 20cm ultrasonic oscillation at intervals of 50 cm; (13) overflow washing; (14) electroplating nickel: the pH value is 3.5-4.5, the temperature is 55-60 ℃, and the current density is 0.3-2A/dm²Adding a copper conductive column for conducting electricity within 5 minutes; (15) overflow washing; (16) hot water washing: cleaning with hot pure water at 70 ℃ for 1 minute; (17) drying: cold air to remove water, drying the water in the fiber,the time is 1 minute; (18) drying: oven at 120 deg.C for 4 minutes; (19) and collecting a finished product.

2. The continuous production process for firmly attaching nickel metal to an aromatic specialty fiber filament according to claim 1, wherein the nickel plating solution of step (14) is nickel sulfate 20-35g/L, nickel chloride 3-5g/L, boric acid 35-45g/L, WN-NickelLS wetting agent 0.5-1.0 mL/L.

3. The continuous production process for firmly attaching nickel metal to an aromatic specialty fiber filament as claimed in claim 1, wherein said step (12) comprises chemical copper (Cu2.5-3 g/L, WN-ELCopper (99) open-cylinder agent (150 mL/L), NaOH4.5g/L, formaldehyde (4 g/L, WN-ELCopper (99) stabilizer (15 ppm), WN-ELCopper (99) additive (1 mL/L).

4. The continuous production process for firmly attaching nickel metal to an aromatic specialty fiber filament as claimed in claim 1, wherein said overflow washing is performed by rinsing with ultrapure water for 3 times for 1 minute and applying ultrasonic oscillation.

5. The continuous production process for firmly attaching nickel metal to an aromatic specialty fiber filament as claimed in claim 1, wherein the ultrasonic oscillation frequency is 20-30 kHz.

6. The continuous production process for firmly attaching nickel metal to an aromatic specialty fiber filament according to claim 1, wherein said aromatic fiber of step (1) comprises one of aramid 1414, PBO fiber, and polyimide fiber.

Technical Field

The invention belongs to the technical field of special fiber metallization, and particularly relates to a continuous production process for firmly attaching nickel metal to an aromatic special fiber filament.

Background

Aromatic fibers are a generic term generally referring to a series of fibers containing aromatic rings in the main chain. The aromatic fibers mainly include aromatic polyamide fibers, aromatic polyester fibers, aromatic heterocyclic fibers, and the like. Because most of the fibers are rigid chain structures, the fibers have higher strength, modulus and heat resistance, and play an important role in military, aerospace, aviation, flame retardance, fire prevention, civil use and the like. For example, the aramid 1414 has extremely high strength which is 5 to 6 times that of high-quality steel, modulus which is 2 to 3 times that of steel or glass fiber, toughness which is 2 to 3 times that of steel, and density which is less than 1/5 of steel, has extremely wide continuous use range, can normally operate for a long time within the range of-196 ℃ to 204 ℃, has the shrinkage rate of 0 at 150 ℃, does not melt and decompose at the high temperature of 560 ℃, has good corrosion resistance and long life cycle. The PBO fiber as the 21 st century super performance fiber has excellent physical and mechanical properties and chemical properties, the strength and the modulus of the PBO fiber are 2 times of those of aramid 1414 fiber, the PBO fiber also has the heat-resistant and flame-retardant properties of meta-aramid fiber, and the physical and chemical properties of the PBO fiber completely exceed those of the aramid 1414 fiber which is in the leading position in the field of high performance fibers. A PBO filament of 1 mm diameter can lift a weight of 450 kg with a strength more than 10 times that of the steel wire fibre. The heat resistance temperature reaches 600 ℃, the limiting oxygen index is 68, the fiber does not burn and shrink in flame, and the heat resistance and the flame retardancy are higher than those of any other organic fiber. The polyimide fiber is an ether homopolymerized fiber with the strength of 4-5 cN/dtex, the elongation of 5-7%, the strength retention rate of 10-12 GPA after 100h at 300 ℃ of 50-70%, the limiting oxygen index of 44 and good ray resistance; the ketone copolymer fiber has an approximately hollow special-shaped cross section, the strength is 3.8cN/dtex, the elongation is 32%, the modulus is 35cN/dtex, the density is 1.41g/cm, and the shrinkage rate in boiling water and at 250 ℃ is respectively less than 0.5% and 1%. The prior various patented technical methods for fiber metallization are storedIn many problems, can't apply to actual volume production stage, technical condition parameter is fuzzy, and the cladding material cohesion is extremely poor, and fibre strength destroys seriously or output metallized fibre parameter can't customize the management and control etc.. For example: chinese patent CN106498715A, using acetone solution to clean for 10-60min, using mixed organic polar solvent to swell for 1-4 hours, immersing for 1-2 hours in silver nitrate solution, then reducing for 0.5-1 hours, using acetone in the preparation process, which is flammable and explosive, volatile, can cause anesthesia to the central nervous system of human, and cause dermatitis after long-term contact, the whole preparation time is too long, and the silver-plated aramid fiber prepared by silver mirror reaction has no adhesive force at all, and has no actual output capacity; the chemical nickel plating of the Chinese patents CN105133301A, CN104894846A, CN104894539A and the like based on the CN106498715A treatment still cannot solve the problem of plating adhesion, and continuous mass production cannot be realized after too long time. The Chinese patent CN101705614B uses a mixture of dimethyl sulfoxide and sodium hydride for coarsening, the mixture of the two substances is easy to cause combustion or explosion, particularly, the silver-plated aramid fiber can meet water in the process of preparing the silver-plated aramid fiber, the danger is very high, dangerous accidents such as fire explosion and the like can be caused by carelessness, and the coarsening mode can greatly destroy the strength of the aramid fiber. Chinese patent CN101705615B uses 20% sulfuric acid for coarsening, and it is completely impossible to perform any surface treatment on the aramid fiber, and it is impossible to form micropores or cracks, so that it is impossible to combine metal with fiber base material, and each step of the process is suspended for a long time, and it is impossible to perform continuous production, and the subsequent chemical nickel and chemical copper plating on the smooth fiber surface forms an insecure composite layer, which cannot meet the requirements of practical application. The resistivity of the silver-plated aramid fiber prepared by the Tiannuo photoelectric patent CN103668944B is less than or equal to 10⁵Omega x cm, too high resistivity to function as it should in practical applications. The silver-plated aramid fiber prepared by the method disclosed by the Chinese patent CN104532553A still cannot meet the practical application requirement, and the preparation time exceeds 3 hours, so that continuous production cannot be realized, and the yield is formed. The technical personnel in the field need to develop a continuous production process for firmly attaching nickel metal to the aromatic special fiber filament to meet the requirementExisting performance requirements and market demands.

Disclosure of Invention

In view of the above problems, the present invention aims to provide a continuous production process for firmly attaching nickel metal to an aromatic specialty fiber filament.

The production process comprises the following specific steps, all the processes of the aromatic fiber including aramid fiber 1414, PBO fiber and polyimide fiber are carried out on an automatic line according to the set length of the sub-groove, the set speed and the fixed parameters, and the fiber is processed by the following processes: 1. alkaline cleaning: passing 3-10% of aromatic special fiber through sodium hydroxide solution by mass fraction, and adding ultrasonic oscillation (time 2 min, temperature 40-60 deg.C); 2. and (3) pure water overflow washing for three times: cleaning with ultrapure water for 3 times for 1 min, and adding ultrasonic oscillation; 3. coarsening: 60% -80% of concentrated sulfuric acid, and 40g/L of WN-LL213 expanding agent (with the temperature of 30-40 ℃, the time of 30 seconds, the auxiliary mechanical vibration, the amplitude of 3.5cm and the vibration frequency of 30 times/min) are added so as to form a longitudinal micro-crack on the premise that the fiber is not broken; 4. and (3) pure water overflow washing for three times: cleaning with ultrapure water for 3 times for 1 min, and adding ultrasonic oscillation; the fiber is subjected to overflow washing for three times to ensure that no liquid medicine residue of the previous procedure exists when the fiber enters the next procedure; 5. surface conditioning: 100g/LWN-Pd2020 surface conditioning agent, at the temperature of 30 ℃ for 2 minutes, and carrying out microscopic modification on the fiber by assisting ultrasonic waves; 6. and (3) pure water overflow washing for three times: cleaning with ultrapure water for 3 times for 1 min, and adding ultrasonic oscillation; 7. pre-activation: 10-30mL/L hydrochloric acid, the temperature is 30 ℃, and the time is 1 minute; 8. pre-palladium: 30-50ppm of colloidal palladium solution CoppermerseclalystAF, stannous chloride 12g/L, hydrochloric acid 250-300mL/L, temperature 35 ℃, time 5 minutes, and segmented ultrasonic wave to make all fibers in the fiber bundle uniformly attached with colloidal palladium;

the palladium colloid is activated, the activation is stable, the effect is good, the bonding strength is improved, after the activation treatment, a single-layer or limited multi-layer palladium colloid cluster protected by tin is formed on the hole wall, then the tin protective layer and redundant palladium are removed through cleaning, only the single-layer or limited multi-layer palladium is left, and the single-layer or limited multi-layer palladium is used as a catalyst, so that the close bonding of the plating layer and the surface of the hole wall is promoted.

And (3) pure water overflow washing for three times: cleaning with ultrapure water for 3 times for 1 min, and adding ultrasonic oscillation; 10. and (3) gel releasing: 15 percent sulfuric acid solution, the temperature is 60 ℃, the time is 1 minute, and ultrasonic oscillation is added; 11. and (3) pure water overflow washing for three times: cleaning with ultrapure water for 3 times for 1 min, and adding ultrasonic oscillation; 12. chemical copper: the temperature is 55 ℃, the time is 8 minutes, intermittent ultrasonic oscillation is added, the fiber adhesion is prevented, and a good copper plating layer is formed; 13. and (3) pure water overflow washing for three times: cleaning with ultrapure water for 3 times for 1 min, and adding ultrasonic oscillation; 14. electroplating nickel: 20-35g/L of nickel sulfate, 4-5g/L of nickel chloride and 35-45g/L, WN g/L of boric acid, 5-1mL/L of NickelLS wetting agent, (pH value is 3.5-4.5, temperature is 55-60 ℃, and current density is 0.3-2A/dm²) For 5 minutes; in order to prevent the adhesion of the fibers, holes are formed in the subslot and below the fibers, and the fibers are inflated and dispersed by air flow. The conductive contact conducts electricity by the water and copper conductive columns, and the conductive mode can prevent the fiber from being burnt due to overhigh local current in the conductive process; 15. carrying out overflow washing on pure water for three times, washing the pure water for 3 times for 1 minute, and adding ultrasonic oscillation; 16. hot water washing: cleaning with hot pure water at 70 ℃ for 1 minute; 17. drying: removing water by cold air, and drying the water in the fiber for 1 minute; 18. drying: oven at 120 deg.C for 4 minutes; 19. and collecting a finished product.

Furthermore, in the step 12, chemical copper Cu2.5-3 g/L, WN-ELCopper99 cylinder opening agent is 150mL/L, NaOH4.5g/L formaldehyde is 4g/L, WN-ELCopper99 stabilizer is 15ppm, and WN-ELCopper99 additive is 1 mL/L.

Furthermore, the ultrasonic oscillation frequency involved in all the steps is 20-24 kHz.

Further, the nickel electroplating solution in the step 14 contains 20-35g/L of nickel sulfate, 4-5g/L of nickel chloride and 35-45g/L, WN of boric acid, and 0.5-1mL/L of NickelLS wetting agent.

Further, the three times of overflow washing of the pure water is ultrapure water washing for 3 times, 1 minute in total, and ultrasonic oscillation is added.

The invention has the beneficial effects that:

the invention discloses a process method and parameters, wherein fibers are subjected to overflow flushing for three times so as to ensure that no liquid medicine residue of the previous procedure exists when entering the next procedure; the conductive contact is conducted by a water and copper conductive column, the conductive mode can prevent the fiber from being burnt out due to overhigh local current in the conductive process, the fiber is coarsened by adopting a concentrated sulfuric acid and expanding agent mode to form a longitudinal micro-crack, the original strength of the fiber is maintained to the maximum degree while the metal adhesive force is ensured, the loss of mechanical property is little, the surface treatment is carried out under the action of discontinuous ultrasonic wave, the surface of the fiber can be completely and uniformly activated, a chemical copper plating layer can be well deposited on the surface of the fiber, a plating layer is flat, compact and uniform, the combination is tight, the process control is reasonable, a nickel electroplating process is adopted in the nickel plating process, the conductivity of the final fiber and the weight of the fiber can be changed by changing the current density and the time to realize the accurate control of the weight and the resistivity of the fiber, the process is a continuous nickel electroplating process and can realize the industrialized continuous production, the obtained aramid fiber with the firmly attached nickel metal not only keeps the characteristics of the original material such as strength, light weight and fire resistance, but also has the advantages of small density, good conductivity and flexibility, good heat resistance, chemical corrosion resistance and the like, can replace the traditional copper wire, stainless steel wire, aluminum wire and the like to be used as new materials in the fields of aerospace, medical military industry and special industry, and can also be used in the fields of intelligent wearing, medical treatment and the like.

Compared with the prior art, the invention has the following advantages:

the invention relates to a nickel plating method for continuously producing aromatic special fibers such as aramid fibers, PBO fibers, polyimide fibers and the like for 24 hours, which firstly solves the problems that high-strength fibers cannot be taken out of a laboratory due to metallization, and stable continuous filament yarns with consistent parameters cannot be produced to produce more than thousands of meters at one time; meanwhile, due to the controllability of the production speed and various chemical plating parameters, the problems of the same length of the fiber yarn, different required conductivity and different plating layer thicknesses are solved; the problems of mass production are solved, and the technical problems of friction resistance and aging resistance of the produced nickel-plated metal coatings of aramid fibers, PBO fibers and polyimide fibers are solved.

Drawings

The invention is explained in detail with the attached drawings, wherein fig. 1 is a flow line operation diagram of a continuous production process of nickel metal firmly attached aromatic special fiber filaments; FIG. 2 is the original surface morphology of the fiber after the pretreatment in example 1, and FIG. 3 is the surface morphology of the fiber after the roughening treatment in example 1.

Detailed Description

The invention is illustrated by the following specific examples, which are not intended to be limiting.

Example 1

The production process comprises the following specific steps of preparing aromatic fibers from aramid 1414500d fibers, performing all processes on an automatic line according to a set length of a sub-groove, a set speed and fixed parameters, and performing the following processes of the fibers: 1. alkaline cleaning: subjecting the aramid 1414500d fiber to a sodium hydroxide solution with the mass fraction of 10%, and adding ultrasonic oscillation (the time is 2 minutes, and the temperature is 60 ℃); 2. and (3) pure water overflow washing for three times: cleaning with ultrapure water for 3 times for 1 min, and adding ultrasonic oscillation; 3. coarsening: adding 40g/L WN-LL213 expanding agent (the temperature is 40 ℃, the time is 30 seconds) into 80 percent concentrated sulfuric acid, and assisting with mechanical vibration, wherein the amplitude is 3.5cm, and the vibration frequency is 200 times/min, so that each fiber filament forms a longitudinal micro-crack on the premise that the fibers are not cracked; 4. and (3) pure water overflow washing for three times: cleaning with ultrapure water for 3 times for 1 min, and adding ultrasonic oscillation; 5. surface conditioning: the fiber is microscopically modified by 100g/LWN-Pd2020 surface conditioning agent (the temperature is 30 ℃, the time is 2 minutes) and ultrasonic waves are assisted; 6. and (3) pure water overflow washing for three times: cleaning with ultrapure water for 3 times for 1 min, and adding ultrasonic oscillation; 7. pre-activation: 10mL/L hydrochloric acid, the temperature is 30 ℃, and the time is 1 minute; 8. pre-palladium: 30-50ppm of colloidal palladium solution Coppermerseinstance catalysis AF, stannous chloride 12g/L, hydrochloric acid 300mL/L, temperature 35 ℃, ultrasonic wave segmentation for 5 minutes, so that all fibers in the fiber bundle are uniformly attached with the colloidal palladium; and (3) pure water overflow washing for three times: cleaning with ultrapure water for 3 times for 1 min, and adding ultrasonic oscillation; 10. and (3) gel releasing: 15 percent sulfuric acid solution, the temperature is 60 ℃, the time is 1 minute, and ultrasonic oscillation is added; 11. and (3) pure water overflow washing for three times:cleaning with ultrapure water for 3 times for 1 min, and adding ultrasonic oscillation; 12. chemical copper: 150mL/L of Cu2.5g/L, WN-ELCopper99 cylinder opening agent, 15ppm of NaOH4.5g/L formaldehyde 4g/L, WN-ELCopper99 stabilizer and 1mL/L of WN-ELCopper99 additive (the temperature is 55 ℃ and the time is 8 minutes), and intermittent ultrasonic oscillation is added to prevent fiber adhesion and form a good copper plating layer; 13. and (3) pure water overflow washing for three times: cleaning with ultrapure water for 3 times for 1 min, and adding ultrasonic oscillation; 14. 14, electroplating nickel: 20g/L of nickel sulfate, 4g/L of nickel chloride and 35g/L, WN g/L of boric acid, 0.5mL/L of NickelLS wetting agent, (pH value is 3.5, temperature is 55 ℃, and current density is 0.3A/dm²Time 5 minutes); conducting electricity by the copper conducting posts; 15. carrying out overflow washing on pure water for three times, washing the pure water for 3 times for 1 minute, and adding ultrasonic oscillation; 16. hot water washing: cleaning with hot pure water at 70 ℃ for 1 minute; 17. drying: removing water by cold air, and drying the water in the fiber for 1 minute; 18. drying: oven at 120 deg.C for 4 minutes; 19. collecting finished products, wherein the ultrasonic oscillation frequency involved in all the steps is 20 kHz. Aramid 1414500D nicotintai and new materials gmbh.

The product performance results are as follows: the 500d aramid 1414 nickel-plated fiber has the breaking strength of more than or equal to 70N, the elongation of more than or equal to 14 percent, the resistance value of less than or equal to 3 omega/m, the change rate of the resistance value of the friction resistance test of less than or equal to 10 percent, and the change rate of the resistance value of the repeated bending test of less than 1 percent.

Example 2

The production process comprises the following specific steps, wherein the aromatic fiber is PBO400d fiber, all the processes are carried out on an automatic line according to the set length of the sub-groove, the set speed and the fixed parameters, and the fiber process flow is as follows: 1. alkaline cleaning: passing the aromatic special fiber through a sodium hydroxide solution with the mass fraction of 3%, and adding ultrasonic oscillation (the time is 2 minutes, and the temperature is 40 ℃); 2. and (3) pure water overflow washing for three times: cleaning with ultrapure water for 3 times for 1 min, and adding ultrasonic oscillation; 3. coarsening: 60% concentrated sulfuric acid, 40g/L WN-LL213 expanding agent are added, the temperature is 40 ℃, the time is 30 seconds, mechanical vibration is assisted, the amplitude is 3.5cm, and the vibration frequency is 30 times/min, so that each fiber filament forms a longitudinal micro-crack on the premise that the fibers are not cracked; 4. and (3) pure water overflow washing for three times: cleaning with ultrapure water for 1 min for 3 times, and addingAdding ultrasonic wave for oscillation; 5. surface conditioning: the fiber is microscopically modified by 100g/LWN-Pd2020 surface conditioning agent (temperature is 30 ℃, time is 2 minutes) assisted by ultrasonic waves; 6. and (3) pure water overflow washing for three times: cleaning with ultrapure water for 3 times for 1 min, and adding ultrasonic oscillation; 7. pre-activation: 30mL/L hydrochloric acid (temperature 30 ℃, time 1 minute); 8. pre-palladium: 50ppm of colloidal palladium solution Coppermerseinstance CatalystAF, 12g/L of stannous chloride and 250mL/L of hydrochloric acid, the temperature is 35 ℃, the time is 5 minutes, and ultrasonic waves are segmented to ensure that all fibers in the fiber bundles are uniformly attached with the colloidal palladium; and (3) pure water overflow washing for three times: cleaning with ultrapure water for 3 times for 1 min, and adding ultrasonic oscillation; 10. and (3) gel releasing: 15 percent sulfuric acid solution, the temperature is 60 ℃, the time is 1 minute, and ultrasonic oscillation is added; 11. and (3) pure water overflow washing for three times: cleaning with ultrapure water for 3 times for 1 min, and adding ultrasonic oscillation; 12. chemical copper: cu3g/L, WN-ELCopper99 cylinder opening agent 150mL/L, NaOH4.5g/L formaldehyde 4g/L, WN-ELCopper99 stabilizer 15ppm, WN-ELCopper99 additive 1mL/L (temperature 55 ℃, time 8 minutes), adding intermittent ultrasonic oscillation, preventing fiber adhesion, forming good copper plating; 13. and (3) pure water overflow washing for three times: cleaning with ultrapure water for 3 times for 1 min, and adding ultrasonic oscillation; 14. and electroplating nickel: 20g/L of nickel sulfate, 4g/L of nickel chloride and 45g/L, WN g/L of boric acid, 1mL/L of NickelLS wetting agent, (pH value is 4.5, temperature is 60 ℃, and current density is 2A/dm²Time 5 minutes); conducting electricity by the copper conducting posts; 15. carrying out overflow washing on pure water for three times, washing the pure water for 3 times for 1 minute, and adding ultrasonic oscillation; 16. hot water washing: cleaning with hot pure water at 70 ℃ for 1 minute; 17. drying: removing water by cold air, and drying the water in the fiber for 1 minute; 18. drying: oven at 120 deg.C for 4 minutes; 19. collecting finished products, wherein the ultrasonic oscillation frequency involved in all the steps is 30 kHz. The PBO fibers were 400dPBO fibers produced in medium-blue-morning light.

The product performance results are as follows: the 400d PBO nickel-plated fiber has breaking strength not less than 80N, elongation not less than 12%, resistance not more than 5 omega/m, resistance change rate of friction resistance test not more than 10%, and resistance change rate of repeated bending test less than 1%.

Note: test methods GB/T3291.1-1997 textile Material Properties and test terminology part 1: fibers and yarns; GB/T3291.3-1997 textile Material Properties and test terminology part 3: the method is on; GB/T6502-2008 chemical fiber filament sampling method; the repeated bending test method for the GB/T238-2013 metal material wire is 1000 times; GB/T14343-2008 chemical fiber filament linear density test method; FZ/T50035-2016 resistance test method for synthetic fiber filament; ASTM D3885-2002, 5000 times, 120r/min, 100 times/circle 0.5Lb, 0.5 Lb; in the GB/T19975-2005 high-strength fiber filament tensile property test method, the gauge length is 250mm, and the tensile speed is 125 mm/min.