Search

CN-122025254-A - Nanocomposite filled computer cable and preparation method thereof

CN122025254ACN 122025254 ACN122025254 ACN 122025254ACN-122025254-A

Abstract

The invention relates to a nanocomposite filled computer cable and a preparation method thereof, belonging to the technical field of cables. The cable comprises a cable core, a shielding layer and a sheath which are sequentially arranged from inside to outside, wherein the cable core is formed by twisting at least two pairs of insulating wires, a honeycomb-section-imitated hydrophobic filling rope is arranged in a twisting gap of the cable core, a hydrophobic nano sol curing layer is filled in the gap of the hydrophobic filling rope and/or the cable core, the hydrophobic filling rope is composed of a polypropylene fiber matrix, a silane coupling agent layer, a silicon dioxide nano particle layer and a fluorosilane hydrophobic layer which are sequentially arranged on the surface of the matrix, and the hydrophobic nano sol curing layer is formed by ultraviolet curing of APTES modified silicon dioxide nano sol. The invention realizes the active blocking and interface strengthening of the longitudinal moisture diffusion path, blocks the longitudinal moisture permeation path for a long time, remarkably improves the interface bonding strength of the filling system and the insulating layer/shielding layer, and improves the high-frequency signal transmission stability.

Inventors

  • ZHU CONGLIN
  • CHEN WEIHAO
  • YU GUANGYONG
  • LI ZHENGBAO
  • YANG JINHUA

Assignees

  • 安徽徽宁电器仪表集团有限公司

Dates

Publication Date
20260512
Application Date
20260324

Claims (10)

  1. 1. The composite material filled computer cable is characterized by comprising a cable core, a shielding layer and a sheath which are sequentially arranged from inside to outside, wherein the cable core is formed by twisting at least two pairs of insulating wire pairs, hydrophobic filling ropes with honeycomb-like cross sections are arranged in twisting gaps of the cable core, and hydrophobic nano sol curing layers are filled in gaps of the hydrophobic filling ropes and/or the insulating wire pairs; the hydrophobic filling rope consists of a polypropylene fiber matrix, a silane coupling agent layer, a silicon dioxide nanoparticle layer and a fluorosilane hydrophobic layer which are sequentially arranged on the surface of the matrix; the hydrophobic nano sol curing layer is formed by ultraviolet curing of APTES modified silica nano sol.
  2. 2. The nanocomposite filled computer cable of claim 1, wherein the hydrophobic fill cord has a regular hexagonal cross section and a side length of 0.5-1.5mm; The silane coupling agent layer, the silicon dioxide nano particle layer and the fluorosilane hydrophobic layer form a micro-nano composite coarse structure on the surface of the substrate.
  3. 3. The nanocomposite filled computer cable of claim 1, wherein in the hydrophobic filler rope, the silica nanoparticles comprising the silica nanoparticle layer have a particle size of 20-100nm and a coverage of greater than or equal to 85%; In the hydrophobic nano sol curing layer, the particle size of nano silicon dioxide composing the silicon dioxide nano sol is 10-50nm, and the solid content is 5-15wt%.
  4. 4. The nanocomposite filled computer cable of claim 1, wherein each insulated wire in the cable core comprises a conductor and an insulating layer coated outside the conductor, wherein a matrix material of the insulating layer is polyethylene or crosslinked polyethylene, and the surface of the insulating layer is subjected to plasma treatment in advance; In the cable core, two insulating wires are stranded to form a pair of insulating wire pairs, and the hydrophobic filling rope and the insulating wire pairs are stranded concentrically.
  5. 5. The nanocomposite-filled computer cable of claim 1, wherein said shielding layer is a tinned copper mesh braid, braid coverage is 80% -95%, and said sheath is a low smoke zero halogen flame retardant polyolefin.
  6. 6. A method of preparing a nanocomposite filled computer cable according to any one of claims 1 to 5, said method comprising the steps of: s1, preparing a hydrophobic filling rope, namely carrying out alkali treatment on a polypropylene fiber bundle, sequentially dipping a silane coupling agent solution, a silicon dioxide nanoparticle dispersion liquid and a fluorosilane solution, taking out, and drying and curing to obtain the hydrophobic filling rope; s2, preparing silica nanosol, namely hydrolyzing tetraethoxysilane under an acidic condition, then adding APTES to carry out surface modification, and regulating pH to 4.0-5.0 to obtain the silica nanosol; S3, cabling, namely concentrically twisting an insulating wire pair and the hydrophobic filling rope, and injecting the silica nano sol into gaps of the insulating wire pair and/or the hydrophobic filling rope in the twisting process; S4, ultraviolet curing, namely irradiating ultraviolet light with the wavelength of 300-405nm for 20-90 seconds at the intensity of 30-100mW/cm 2 to cure the silica nanosol to form the hydrophobic nanosol curing layer; S5, sequentially coating the shielding layer and the sheath to obtain the computer cable.
  7. 7. The preparation method according to claim 6, wherein in the step S1, the alkali solution used in the alkali treatment is 3-8wt% NaOH solution, the treatment temperature is 55-65 ℃ and the treatment time is 5-20min; the silane coupling agent solution is KH-550 ethanol solution with the concentration of 1-5wt%, the pH value is 4-5, and after the silane coupling agent solution is immersed, the solution is firstly dried for 10-20min at the temperature of 90-110 ℃, and then the next immersing procedure is carried out; The silica nanoparticle dispersion liquid takes isopropanol as a dispersion medium system, the mass percentage of the silica nanoparticles is 2-5wt%, ultrasonic treatment is assisted during impregnation, the impregnation time is 10-20min, and after the impregnation is completed, the silica nanoparticle dispersion liquid is firstly dried at 70-90 ℃ and then subjected to the next impregnation procedure; The fluorosilane is tridecafluorooctyl trimethoxy silane, the concentration of the fluorosilane solution is 0.5-2wt%, the temperature of drying and curing is 110-130 ℃ and the time is 1.5-2.5h.
  8. 8. The process according to claim 6, wherein in step S2, the hydrolysis of ethyl orthosilicate under acidic condition is carried out by mixing ethyl orthosilicate with ethanol and water according to a molar ratio of (3-5): 1.5-2.5, then adding 0.05-0.2mol/L hydrochloric acid solution, adjusting pH to 2.5-4.0, hydrolyzing at 35-45deg.C for 1.5-2.5h, and adding APTES according to a molar ratio of TEOS: APTES= (5-20): 1 for 0.8-1.5h.
  9. 9. The preparation method according to claim 6, wherein in the step S2, 0.1 to 2.0wt% of a photoinitiator selected from at least one of 2,4, 6-trimethylbenzoyl diphenyl phosphine oxide, bis (2, 4, 6-trimethylbenzoyl) phenyl phosphine oxide and aryl salt is added to the nanosol.
  10. 10. The method according to claim 6, wherein the insulating wire pair is subjected to atmospheric pressure plasma treatment for 30 to 90 seconds before step S3 is performed; in the step S3, the ratio of the number of concentric stranding of the insulating wire pair to the number of concentric stranding of the hydrophobic filling rope is 1 (0.6-1.2), the stranding pitch of the concentric stranding is 60-100mm, and the injection rate of the silica nano sol is 0.3-0.8mL/m; In step S4, the ultraviolet curing is performed under an inert gas protection atmosphere.

Description

Nanocomposite filled computer cable and preparation method thereof Technical Field The invention belongs to the technical field of cables, and in particular relates to a nanocomposite filled computer cable and a preparation method thereof. Background The computer cable is used as a core component of key infrastructures such as an industrial automation control system, a data center, rail traffic signal transmission and the like, and the long-term reliability of the computer cable is directly related to the safe and stable operation of the whole system. In severe service environments such as coastal high humidity, underground pipe gallery, ocean platform and the like, the design defect of a cable core filling system has become a main cause for early failure of a cable, and the reliability and the service life of high-end equipment are severely restricted. At present, a polypropylene (PP) filling rope with a circular section is commonly adopted in the industry to be placed in a twisted wire pair gap, and only the functions of physical support and cable core rounding are realized. To improve the moisture resistance, some techniques have attempted to surface modify the fill cord. The existing modification scheme has the obvious limitations that firstly, a continuous triangular micro-gap is formed after the round filling rope and the round insulating wire pair are twisted to form a capillary channel for longitudinal diffusion of moisture, the gap cannot be plugged by a surface coating, and secondly, the coating and the PP matrix are only physically attached and have no chemical bonding, and are easy to fall off in the bending or thermal cycle process of the cable. Aiming at the problem of gap permeation, the industry tries to adopt a water-blocking ointment filling scheme. The scheme has the new defects that firstly, the temperature adaptability is poor, the water-blocking ointment is easy to harden and shrink at low temperature (less than 10 ℃), the tightness is lost, the water-blocking ointment is easy to soften and flow at high temperature (more than 60 ℃), the wiring terminal is polluted, the contact resistance is increased, secondly, the material compatibility risk is high, the organic component in the ointment is contacted with the PE insulating layer for a long time to cause swelling and accelerate insulation aging, thirdly, the construction and maintenance are difficult, and the later maintenance cost is high. Therefore, there is a need to develop an innovative filling system to break through the bottleneck of the prior art and meet the urgent demands of high-end equipment on high reliability and long service life of computer cables in the new infrastructure. Disclosure of Invention The invention aims to provide a nano composite material filled computer cable and a preparation method thereof, which have the characteristics of eliminating a capillary channel for longitudinal moisture permeation from a structural source and improving the moisture resistance. The aim of the invention can be achieved by the following technical scheme: The computer cable filled with the nanocomposite comprises a cable core, a shielding layer and a sheath which are sequentially arranged from inside to outside, wherein the cable core is formed by twisting at least two pairs of insulating wires, hydrophobic filling ropes with honeycomb-like cross sections are arranged in twisting gaps of the cable core, and hydrophobic nano sol curing layers are filled in the gaps of the hydrophobic filling ropes and/or the insulating wire pairs; the hydrophobic filling rope consists of a polypropylene fiber matrix, a silane coupling agent layer, a silicon dioxide nanoparticle layer and a fluorosilane hydrophobic layer which are sequentially arranged on the surface of the matrix; the hydrophobic nano sol curing layer is formed by ultraviolet curing of APTES modified silica nano sol. In the technical scheme, the hydrophobic filling rope is subjected to multiple treatments of silane coupling, silica rice particle loading and fluorosilane modification, and the seamless filling of the hydrophobic nano sol curing layer is combined, so that a continuous hydrophobic network is formed by covalent bonding of the hydrophobic nano sol curing layer, the surface of the hydrophobic filling rope and the surface of the insulating layer of the insulating wire pair through Si-O-C, the inside of the cable is subjected to omnibearing hydrophobic protection, moisture invasion is effectively prevented, and the structural compactness and tensile resistance of the cable are improved. Wherein, the APTES is 3-aminopropyl triethoxysilane. Further, the cross section of the hydrophobic filling rope is regular hexagon, and the side length is 0.5-1.5mm. In this technical scheme, the cable core is formed by insulating wire pair twist, and insulating wire pair's cross section is circular, can take place deformation when the transposition, and after taking place deformation, its