CN-122025229-A - Flame-retardant fire-resistant shielding flexible cable and production and preparation process thereof

CN122025229ACN 122025229 ACN122025229 ACN 122025229ACN-122025229-A

Abstract

The invention belongs to the technical field of cables, and provides a flame-retardant fire-resistant shielding flexible cable and a production and preparation process thereof, wherein the flame-retardant fire-resistant shielding flexible cable comprises a cable core and an outer sheath; the cable core is formed by twisting a plurality of twisted wire cores, each twisted wire core is formed by two twisted insulating wire cores, each insulating wire core comprises a soft copper conductor base material, a synthetic mica double-layer wrapping layer and an insulating layer, a tinned soft copper wire braided shielding layer is arranged outside each twisted wire core, the plurality of twisted wire cores are twisted into a cable, a metal copper strip shielding layer is synchronously wrapped in the twisting process, and an outer sheath layer is arranged outside the metal copper strip shielding layer. The invention provides a flame-retardant fire-resistant shielding flexible cable, which adopts a multilayer collaborative flame-retardant fire-resistant design, a cable core adopts a double-layer tightly wrapped synthetic mica tape as a fire-resistant insulating layer, mica is used as an inorganic material, and the cable core has a stable structure at high temperature, can effectively isolate flame and heat, can still maintain safe and reliable performance under extreme conditions such as fire, and provides powerful guarantee for personnel safety and fire rescue.

Inventors

CUI LIANG
ZHA WENBIN
WANG WENLONG
YAO YINGGUO
Sheng Siwei
TANG LIN
RUAN JIE
FANG JUAN
HE YULI

Assignees

铜陵长江铜业有限公司

Dates

Publication Date: 20260512
Application Date: 20260313

Claims (10)

1. The flame-retardant fire-resistant shielding flexible cable is characterized by comprising a cable core and an outer sheath, wherein the cable core is formed by twisting a plurality of twisted wire cores, the twisted wire cores are formed by two twisted insulating wire cores, the insulating wire cores comprise a soft copper conductor base material, a synthetic mica double-layer wrapping layer and an insulating layer, a tinned soft copper wire braided shielding layer is arranged outside the twisted wire cores, the twisted wire cores are twisted into a cable, and a metal copper strip shielding layer is synchronously wrapped in the twisting process, and the outer sheath layer is arranged outside the metal copper strip shielding layer; The outer sheath material is prepared by mixing and extruding the following raw materials in parts by weight at 160-220 ℃: 90-110 parts of polyvinyl chloride, 10-15 parts of modified hexagonal boron nitride, 4-8 parts of zinc oxide, 8-15 parts of plasticizer, 1-2 parts of lubricant and 0.5-1.5 parts of antioxidant.
2. The flame retardant and fire resistant shielded flexible cable according to claim 1, wherein the modified hexagonal boron nitride is prepared by the steps of: Adding hexagonal boron nitride into deionized water, dispersing by ultrasonic until the mixture is uniform, then dropwise adding deionized water containing tannic acid and zinc sulfate heptahydrate, stirring and reacting for 1-2 hours, centrifuging, filtering and collecting, washing and vacuum drying to obtain modified hexagonal boron nitride.
3. The flame-retardant and fire-resistant shielding flexible cable according to claim 2, wherein the dosage ratio of hexagonal boron nitride to deionized water is 2.0-2.5 g:150mL, and the dosage ratio of tannic acid, zinc sulfate heptahydrate and deionized water is 0.17-0.20 g:0.24-0.28 g:50mL.
4. The flame retardant and fire resistant shielded flexible cable according to claim 1, wherein the plasticizer is at least one of triphenyl phosphate, resorcinol bis (diphenyl phosphate), bisphenol a bis (diphenyl phosphate).
5. The flame retardant and fire resistant shielded flexible cable according to claim 1, wherein the lubricant is at least one of polyethylene wax, paraffin wax, stearic acid amide, oleic acid amide.
6. The flame retardant and fire resistant shielded flexible cable according to claim 1, wherein the antioxidant is at least one of hindered phenols, phosphites, hindered amines antioxidants.
7. The process for producing and preparing the flame-retardant and fire-resistant shielding flexible cable according to claim 1, comprising the following steps: Step 1, preparation of soft copper conductor substrate Bundling a plurality of soft copper monofilaments through a wire bundling machine to form a primary wire harness, performing secondary re-twisting on a plurality of primary wire harnesses, and performing rounding treatment to obtain a soft copper conductor substrate; Step 2, composite insulation coating Adopting synthetic mica tape, and carrying out double-layer reverse wrapping on the soft copper conductor substrate prepared in the step 1 at an overlapping rate of more than or equal to 55% to form a synthetic mica double-layer wrapping layer; step 3, wire core twisted pair forming Taking two wire cores coated with the insulating layer in the step 2 as a group, and performing twisted pair by a 2:1 cantilever twisted pair machine to obtain a twisted pair wire core; Step 4, double-layer composite shielding treatment Forming a tinned annealed copper wire shielding net by braiding a layer of tinned annealed copper wire shielding net outside a twisted wire core through a high-speed braiding machine, and forming a tinned annealed copper wire braiding shielding layer; step 5, extruding the flame-retardant sheath Extruding a layer of outer sheath material outside the composite shielding cable core obtained in the step 4 to form an outer sheath layer; and 6, detecting the comprehensive performance of the obtained product.
8. The production and preparation process of the flame-retardant and fire-resistant shielding flexible cable according to claim 7, wherein the thickness of the insulating layer in the step 2 is 0.5-0.8 mm.
9. The production preparation process of the flame-retardant and fire-resistant shielding flexible cable according to claim 7 is characterized in that the coverage rate of the tinned annealed copper wire shielding net in the step 4 is more than or equal to 90%, the thickness of the tinned annealed copper wire braided shielding layer is 0.15-0.20 mm, and the thickness of the metal copper belt is 0.15-0.25 mm.
10. The production and preparation process of the flame-retardant and fire-resistant shielding flexible cable according to claim 7, wherein the thickness of the outer sheath layer in the step 5 is 1.2-1.5 mm.

Description

Flame-retardant fire-resistant shielding flexible cable and production and preparation process thereof Technical Field The invention belongs to the technical field of cables, and particularly relates to a flame-retardant fire-resistant shielding flexible cable and a production and preparation process thereof. Background The cable is used as a carrier for electric energy and signal transmission, is widely applied to various fields of national economy, particularly in occasions with extremely high requirements on safety and reliability, such as buildings, rail transit, metallurgy, chemical industry, nuclear power, ships and the like, and has extremely high flame retardance and fire resistance besides meeting basic electric properties, so that when a fire disaster occurs, the cable can effectively prevent flame from spreading (flame retardance), maintain the integrity and functions (fire retardance) of a circuit for a period of time, and provide vital power guarantee for alarming, fire extinguishment, emergency lighting and personnel evacuation. The structure of the common flame-retardant fire-resistant cable in the market at present mostly adopts the traditional schemes such as mica tape wrapping, ceramic silicon rubber insulation or metal sheath. However, the conventional cable material has the problems that (1) the conventional fire-resistant cable generally depends on a hard structure such as a mica tape, a ceramic material and the like, and can provide certain fire resistance, but the cable has high hardness and large bending radius, so that the application requirements of the flexible cable on the occasions of mobile laying and frequent bending (such as equipment internal wiring, a robot cable and the like) are difficult to meet. For example, chinese patent application No. CN108140421a discloses a ceramic silicone rubber fire-resistant cable, in which the insulating layer is made of ceramic silicone rubber, but the overall rigidity is high after cable formation, and the mica layer is liable to fracture due to repeated bending. (2) The existing flame-retardant cable mostly adopts a halogen-containing or halogen-free flame-retardant system, wherein the halogen-free system can reduce toxic smoke, but has lower flame-retardant efficiency, and a large amount of fillers such as aluminum hydroxide, magnesium hydroxide and the like are required to be filled, so that the mechanical property of the material is reduced, and the continuity and electromagnetic compatibility effect of a metal shielding layer are influenced. For example, in the chinese patent application No. CN107731351a, a high-filled halogen-free flame retardant polyolefin sheath is used, but the adhesion between the shielding layer and the sheath is poor, and the shielding layer is easy to fall off when bending. Therefore, the development of a new process for producing a flame-retardant and fire-resistant flexible cable, which has excellent flame-retardant and fire-resistant properties and good service performance, is required, and the development of the technology has become an important technical development direction of the cable industry. Disclosure of Invention In order to overcome the defects of the prior art, the invention provides a flame-retardant fire-resistant shielding flexible cable and a production and preparation process thereof. The aim of the invention can be achieved by the following technical scheme: the invention provides a flame-retardant fire-resistant shielding flexible cable which comprises a cable core and an outer sheath, wherein the cable core is formed by twisting a plurality of twisted wire cores, the twisted wire cores are formed by two twisted insulating wire cores, the insulating wire cores comprise a soft copper conductor base material, a synthetic mica double-layer wrapping layer and an insulating layer, a tinned soft copper wire braided shielding layer is arranged outside the twisted wire cores, the twisted wire cores are twisted into a cable, and a metal copper strip shielding layer is synchronously wrapped in the twisting process; The outer sheath material is prepared by mixing and extruding the following raw materials in parts by weight at 160-220 ℃: 90-110 parts of polyvinyl chloride, 10-15 parts of modified hexagonal boron nitride, 4-8 parts of zinc oxide, 8-15 parts of plasticizer, 1-2 parts of lubricant and 0.5-1.5 parts of antioxidant. In some embodiments of the invention, the modified hexagonal boron nitride is prepared by: Adding hexagonal boron nitride into deionized water, dispersing by ultrasonic until the mixture is uniform, then dropwise adding deionized water containing tannic acid and zinc sulfate heptahydrate, stirring and reacting for 1-2 hours, centrifuging, filtering, collecting, washing, and drying in a vacuum drying oven at 80 ℃ for 12 hours to obtain modified hexagonal boron nitride. Hexagonal boron nitride is a good heat-resistant superhard material, and the flame retardant effect and mecha