CN102136319B - Continuous high-strength fiber resin-based compound core for overhead conductor and preparation method thereof - Google Patents
Continuous high-strength fiber resin-based compound core for overhead conductor and preparation method thereof Download PDFInfo
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Abstract
The invention relates to an improved high-strength fiber resin-based compound core for an overhead conductor. The improved high-strength fiber resin-based compound core is characterized by being formed by twisting a plurality of single compound cores, wherein each single compound core is at least formed by concentrically compounding an inner layer fiber resin core and an outer layer fiber resin core; curing resin for outer layer fibers at least except a core layer is flexible resin the vitrified temperature of which is more than or equal to 180 DEG C; and the thickness of the outer layer is between 0.5 millimeter and 3 millimeters. By adopting the preparation method, the overall bending property of an obtained twisted compound core is remarkably improved, and the minimum bending radius is 40 times of the diameter or smaller after twisting; the twisted compound core can bear radial compressive stress, has a high injury tolerance ratio and good using safety, can be directly connected by adopting ordinary hardware fitting and construction hardware fitting for a conductor in a compression joint way without cracking; the using and erecting costs and the construction cost are greatly lowered; and popularization and application are promoted. A single compound core is molded in a semi-curing mode, so that pulling and extruding speeds can be greatly increased and the production speed of the entire compound core can be increased by 20-50 percent compared with that of the conventional compound core adopting cured resin.
Description
Technical field
The present invention is to the improvement of aerial condutor with load-bearing component continuous high-intensity fiber resin-based composite core and preparation method, relates in particular to a kind of good bandability, and the aerial condutor that can bear radially grip pressure power is with composite core and preparation method.
Background technology
Continuous high-intensity fiber resin-based composite core, with lightweight, stretching resistance is strong, the coefficient of expansion is little, can bear high temperature (for example more than 180 ℃) operation, sag is little, replaces zinc-coated wire as the aerial condutor load-bearing component, draw greatly anharmonic ratio, low arc drop, low sag, low creep, low line loss, high temperature resistant with what realize aerial condutor, obtained domestic and international power industry favor.
Prior art prepares the aerial condutor load-bearing component---continuous high-intensity fiber resin-based composite core, for example the applicant formerly applies for a patent CN2847470, and the described aluminium conductor of Chinese patent CN1649718 strengthens cable composite core, Chinese patent CN101572132 transmission pressure glass fibre and carbon fiber complex core, Chinese patent CN101325098 high-intensity fiber compound reinforced core, Chinese patent CN201237921 composite material core for feeder cable etc.Its inside and outside core all adopts same high temperature resistant thermosetting resin (for example vitrification point 〉=180 ℃ epoxy resin) heat of immersion curing molding, and the ectonexine fibre core is all take bearing tension as main.The high temperature resistant thermosetting resin, the crisp hard attitude that is similar pottery after curing, all solidify by the thermosetting animi resin the continuous high-strength fiber composite core that obtains by this class, found in actual use some inevitable inherent defects: the one, after solidifying, the hardness of core is large, cause the composite core bending radius large, minimum bending radius is about 50 times of diameters, makes troubles for production, payingoff construction; The 2nd, after solidifying, resin is crisp rigid large, fracture toughness, and poor impact resistance, damage tolerance is lower, it is stressed that vertically easy to crack (longitudinal cracking can cause the composite core performance significantly to descend, lose the composite core meaning), easily cause potential safety hazard, radial mechanical performance extreme difference particularly, can not bear radially grip pressure power, cause in erection process, can not adopt common steel core wire mainly with the connection gold utensil of crimping mode, need to be equipped with the carrying pulling force and rely on mainly that between composite core and gold utensil, frictional force is main special-purpose gold utensil.And the special-purpose more common crimping armor clamp of gold utensil that connects is expensive, and a cover often needs much to connect gold utensil about 5000-6000 unit on a circuit, greatly increased construction of line cost, has limited applying of compound core conducting wire.
The applicant once proposed the composite core structure that outer layer fiber adopts canoe in Chinese patent CN200962340, but resin is still unified thermosetting resin.Although improved to a certain extent composite core radial strength and resisting longitudinal cracking behavior.Yet because sclerosis and the fragility defective of common thermosetting resin do not improve, therefore above-mentioned shortcoming still exists.
Above-mentioned deficiency still has is worth improved place.
Summary of the invention
The object of the invention is to overcome the deficiency of above-mentioned prior art, a kind of not only good bandability is provided, and can bears radially grip pressure power, damage tolerance than large aerial condutor with continuous high-intensity fiber resin-based composite core.
Another purpose of the present invention is to provide a kind of preparation method of above-mentioned composite core.
The present invention's the first purpose realizes, the main improvement: the one, and the use composite core adopts the twisted composite core of the many stranded compositions of single composite core, to improve the bending property of composite core; The 2nd, the outermost resin of the single composite core of stranded use, use the flexible resin of vitrification point 〉=180 ℃ instead, bear radially grip pressure power to improve composite core, increase the damage tolerance ratio, making it to adapt to aerial condutor does not ftracture with the grip pressure power of gold utensil with generic connectivity, thereby it is not enough to overcome above-mentioned prior art, realizes the object of the invention.Specifically, aerial condutor of the present invention is with continuous high-intensity fiber resin-based composite core, comprise ℃ resin solidification polymerization through vitrification point 〉=180 of at least a continuous high-intensity fiber, it is characterized in that composite core is by many stranded the forming of single composite core, described single composite core is at least by inner fiber resin core and outer layer fiber resin core compound composition with one heart, wherein the outer layer fiber cured resin except sandwich layer is the flexible resin of vitrification point 〉=180 ℃ at least, outer layer thickness 0.5～3mm.
In the present invention:
Dan Fuxin, at least by inside and outside bilaminar fiber resin concentric compound composition, the center internal layer is mainly take bearing tension as main, still adopt prior art thermosetting resin cured, to give full play to all high-intensity fiber performances, outer (can comprise time skin) holds the pressure protect core mainly as bearing in the present invention, do not make it ftractureed by the gold utensil compression, improve the damage tolerance ratio, simultaneously to improving bending property, strengthen tension respective action is also arranged, its resin adopts and is different from the existing animi resin that is hard attitude after prior art is solidified, change into and adopt the flexible resin that has certain flexibility after curing.Be that the present invention is except outer resin difference; All the other all can be identical with the prior art composite core, such as the ectonexine fiber can adopt the identical high-intensity fiber of former composite core (such as but not limited to carbon, Kev draw, basalt, glass, aramid fiber, aluminium oxide, carborundum, boron, aromatic polyamides, liquid crystal fiber, high-performance polyethylene fibres, high-performance finer wire, B alloy wire etc.), internal layer core resin adopts former composite core same resin.Each layer continuous fiber can be Single Fiber, can be also that two kinds or above fiber mix, and fiber volume fraction is more than 50%, 50-80% for example, and they are prior art.Consider that the Dan Fuxin force way changes to some extent than the prior art composite core, the whole tensile strength of internal layer core fibre, better 〉=2500Mpa, for example tensile strength 2500～4000Mpa; Outer layer fiber tensile strength allows to select suitably to hang down the fiber (can certainly be identical with inner fiber) of some, to reduce costs.The outer layer fiber form can be that continuous fiber vertically coats and/or is wound around, and can be also the coatings such as fiber cloth, felt, net.Outer core thickness 0.5～3mm, for preferred values is determined in the test of different-diameter wire, too small might causing of thickness compresses under (pressure satisfies tractive effort) power at gold utensil to internal layer core resistance to compression protection not, can cause the destruction to the internal layer core, also just lose meaning of the present invention; Blocked up not only without practical significance, can cause on the contrary the increase in core cross section under identical pulling force.Depending on diameter of wire, skin can be that one deck can be also multilayer, for example 1～2 layer.
Outer core flexible resin, with respect to being hard fragility (similar pottery) cured resin after the curing that existing composite core is used for example for thermosetting resin, refer to have after it solidifies thermosetting that relatively existing composite core uses for example epoxy resin certain compressive strain amount is arranged, can bear and connect the gold utensil compression and indehiscent resin, after solidifying, percentage elongation is greater than the internal layer core, compression strength is lower than the internal layer core, percentage elongation after for example solidifying 〉=8%, compression strength 〉=50MPA, less than the internal layer core, the flexible resin of vitrification point 〉=180 ℃.If after solid, the resin percentage elongation is too low, be subjected to larger pressure still easy to crack; Compression strength is too low, and external force is difficult for being passed to inner core, causes enough tractive effort by holding with a firm grip.The outer flexible resin that uses, make connection gold utensil and composite core stressed, be main by original main dependence and composite core frictional force, become and to adopt common being connected to take compression to lead (compression is as main stress), connect the general gold utensil of gold utensil employing aerial condutor thereby can make.flexible resin, it can be thermoplastic resin, it can be also thermosetting resin, as long as satisfy to use, vitrification point is required (for example vitrification point 〉=180 ℃), can adopt the commercially available curable flexible resin that serviceability temperature requires that meets, also can adopt the existing resin that composite core is used that meets, epoxy for example, phenolic aldehyde, polyether-ether-ketone, polysulfones, polyimides, fluoroplastics, nylon, modified poly ethylene, modified polypropene, modified poly ester, Merlon, polyphenylene sulfides etc. carry out flexible modification, for example add the Flexible Curing Agent modification, this belongs to prior art.They are for example the flexible polyurethanes (NP1851) of ALH SYSTEMS company; Guangzhou is the acrylic acid modified polymer (SG-1155) of state's industrial chemicals Co., Ltd still; the phenol-formaldehyde resin modified of Shanghai poly-good fortune chemistry Co., Ltd; the modified organic silicone resin (WD-304) of Gao Anwande organosilicon material Co., Ltd; the modified epoxy (PLM-3203) of Zhuzhou generation woods polymer Co., Ltd, the lucky agate in the Shanghai Co., Ltd's epoxy resin (G40122) etc. of refining.
Ectonexine plexiglas temperature requirement is mainly considered from wire long-time running temperature angle, if the vitrification point of cured resin is too low, can reduce the operating temperature of wire, has also just lost the meaning of composite core as the wire load-bearing component.For making wire that higher ampacity be arranged, ectonexine plexiglas temperature, more preferably 〉=200 ℃, be preferably 〉=210 ℃, the vitrification point of resin is higher, the operating temperature that wire can bear is also just higher, and its ampacity of same conductor cross section is also higher, and the superiority of compound core conducting wire is also just more obvious.
Twisted composite core of the present invention, for convenience of stranded and be conducive to bendability and improve, test determines that the single composite core sectional area of stranded use better adopts 3～15mm
2Single composite core is meticulous, and the one, existing pultrude process realizes that difficulty is relatively large, the 2nd, can affect tensile strength, can not give full play to the high-intensity fiber effect; If cross slightly, be unfavorable for the follow-up core that is twisted into.
The single composite core cross sectional shape of stranded use is not limit, can be common circle, zigzag, ellipse, can be also the special-shaped non-circular structure of similar molded line conductor, as trapezoidal, quincunx, watt shape, fan-shaped, Z-shaped (it is valueless that non-stranded single core is done form wire, so be the circular section).Lay configuration, a kind of preferably outermost layer adopts non-round line, can bear more high radial grip pressure power.
In above-mentioned single composite core diameter range, the stranded number of plies is comparatively suitable with layer 2-4, and 5～25 times of stranded lay ratios, and from inside to outside stranded lay ratio reduces are conducive to the Stability Analysis of Structures after stranded.The stranded number of plies is too much, stranded complex process, and stranded difficulty increases, and also without practical significance.The twisted composite core structure can be that the single composite core of same cross-sectional is regular or informal stranded, can be also that different cross section list composite core is informal stranded.A kind of better twisted cores structure of the present invention, outermost layer adopt molded line list composite core, and being conducive to reduce the gap increases the cross section, make to reduce the twisted cores cross section under identical tensile strength, and can improve the twisted cores surface smoothness.
Composite core preparation of the present invention can be adopted the single composite core of pultrusion and be stranded in a technological process and complete, and for example is used for few number of plies as 2 layers of twisted cores; Also can adopt the single composite core of moulding to separate with multicore is stranded, this method can be used for for example twisted cores more than 3 layers of multilayer.Wherein maximum is different from prior art, for single composite core moulding is divided into regelate, i.e. and semi-solid preparation moulding, the stranded rear curing of finally completing.Specifically, aerial condutor of the present invention comprises the high-intensity fiber impregnating resin with continuous high-intensity fiber resin-based composite core preparation method, the hot curing typing, it is characterized in that fiber impregnated resin heating obtains semi-solid preparation list composite core, many stranded after, be heated to solidify fully.
In the inventive method:
The fiber resin matrix composite core, being heating and curing was divided into for two steps, and pre-profiling heating is the semi-solid preparation core, heats to solidifying fully after stranded again.The pre-profiling semi-solid preparation, with respect to prior art prepare composite core be heating and curing once finalize the design for, refer to the fiber impregnated resin pultrusion, be heated into semi-cured state (mainly playing styling), be heating and curing as long as in curing time and/or temperature, a condition does not reach solidifying requirements, products obtained therefrom is semi-solid preparation (the equal semi-solid preparation of ectonexine).The present invention adopts semi-solid preparation typing composite core stranded, be heated to again complete curing mode after stranded moulding, mainly to consider from being conducive to be twisted into core, not only semi-solid preparation is conducive to stranded (if stranded again after single core solidifies fully, can cause back twist when stranded), and further solidify by resin after stranded, being conducive to cohesive force raising between stranded each single core, the composite core globality is better.Its single composite core preparation, except outer resin adopted curable flexible resin and regelate, all the other were all same as the prior art, for example are heating and curing by the impregnating resin pultrusion.
Stranded mode can adopt the incorgruous stranded mode of common wire stranding interlayer, because interlayer has resin-bondedly, also can adopt the stranded in the same way mode of interlayer, and can not cause stranded in the same way rear loose.Single core is twisted into core, and potting resin, can not be filled with the flexible resin identical with skin yet, floods flexible resin when namely multicore is stranded again.The present invention better adopts flexible resin to fill, and both can play stronger mutual cementation, also is conducive to further improve radially anti-pressure ability of twisted cores, can better protect the internal layer sclerosis core of each single composite core not ftracture.
For this reason, ectonexine resin of the present invention is better selected relatively long resin curing time, for example 2-5 minute curing time, if curing time is too short, is unfavorable for regelate; Curing time is long, can affect speed of production and efficient again.
In addition, be further to improve radially anti-pressure ability of composite core, a kind of is better at the outer wrapped or vertical bag one deck low modulus of twisted cores, resistant to elevated temperatures filament, net, felt, cloth, is impregnated with flexible resin during more preferably wrapped or vertical bag.
Aerial condutor of the present invention is with continuous high-intensity fiber resin-based composite core, with respect to prior art, due to many relatively thin composite core lay configuration of an employing, two each single composite core outermost layer at least adopt flexible resin to solidify, not only make gained composite core integrally bending performance be improved significantly, minimum bending radius is stranded rear 40 times of diameters or less, has obviously than the single composite core of prior art to reduce, both facilitate production, transportation, and facilitated again wiring to set up; And because after flexible resin curing, certain pressure distortion amount being arranged, can bear radial compressive stress, damage tolerance is than large, thereby gold utensil directly connects in the crimping mode with being connected with common gold utensil (each is 200 yuan of left and right approximately) can to adopt wire, and can not occuring, composite core do not ftracture, test uses common aerial condutor not find cracking with gold utensil crimping (satisfying pulling force), greatly reduces to use to set up cost and operating expenses, more is conducive to apply.Damage tolerance has also improved safety in utilization than large.The moulding of semi-solid preparation mode is adopted in single composite core preparation, and pultrusion speed can be accelerated greatly, and because of stranded holding time not substantially, therefore whole composite core speed of production, can adopt animi resin to improve 20-50% more originally.The pioneering compound outer flexible resin that adopts solidifies, and adopts the stranded composition composite core of multicore, and this is different from two main innovate point of prior art for the present invention.
Below in conjunction with some specific embodiments; essence of the present invention is further understood in exemplary illustration and help; but the embodiment detail is only for the present invention is described; do not represent that the present invention conceives lower whole technical scheme; therefore should not be construed as the technical scheme restriction total to the present invention, some are In the view of the technical staff, and the unsubstantiality that does not depart from the present invention's design increases and/or changes; for example simple the change or replacement of technical characterictic to have same or similar technique effect, all belong to protection range of the present invention.
Description of drawings
Fig. 1 is a kind of single composite core schematic cross-section of twisted composite core of the present invention.
Fig. 2 is the another kind of single composite core schematic cross-section of twisted composite core of the present invention.
Fig. 3 is another single composite core of twisted composite core of the present invention cross section simplified schematic diagram.
Fig. 4 is a kind of twisted composite core schematic cross-section of the present invention.
Fig. 5 is the another kind of twisted composite core schematic cross-section of the present invention.
Fig. 6 is another twisted composite core schematic cross-section of the present invention.
Fig. 7 is another twisted composite core schematic cross-section of the present invention.
Fig. 8 is another twisted composite core schematic cross-section of the present invention.
Embodiment
Embodiment 1: referring to Fig. 1, the single composite core 1 of stranded use, be that the T700 carbon fiber of 75V/V% and the Epoxy Resin of 25V/V% change into diameter of phi 2mm internal layer core 1.2 by volume fraction, glass fibre textile tapes and G40122 epoxy flexible resin solidify composition skin 1.1, the compound diameter 2.5mm composite core that obtains with one heart.Wherein ectonexine plexiglas temperature is 185 ℃, 2.5 minutes curing times, by prior art dipping pultrusion composite molding, obtains semi-solid preparation (the soft attitude that vulcanite is arranged) composite core by 120 ℃ of 1 minute pultrusion moulds standby.
Embodiment 2: referring to Fig. 2, as embodiment 1, single composite core 2 is by three layers of concentric compound composition, and its two layer 2.1 of China and foreign countries and 2.2 resins adopt flexible resin, as PLM-3203.Single composite core pultrusion is semi-cured state.
Embodiment 3: referring to Fig. 3, as embodiment 1, single composite core 3 cross sections are a watt shape, and wherein core is that carbon fiber is solidified by thermosetting epoxy resin, and outer 3.1 and times outer 3.2 by the vertical bag of alkali-free glass fibre, and flexible resin solidifies.Single composite core pultrusion is semi-cured state.
Embodiment 4: referring to Fig. 4, and twisted composite core of the present invention, the semi-solid preparation list composite core 1 by 7 same diameters of example 1 gained is twisted into composite core by two layers of 1+6,10 times of stranded lay ratios.During the single core of each single composite core such as moulding, all pass through in the flexible resin groove when stranded, by heating, resin is solidified fully after stranded moulding, obtain the twisted composite core that has flexible resin 4 to fill between core.40 times of diameters of bending radius circumferentially apply the 1000Mpa stress cracking of holding with a firm grip.
Embodiment 5: referring to Fig. 5, as embodiment 4, by 19 examples, 1 semi-solid preparation list composite core, press the 1+6+12 structure stranded, 40 times of diameters of bending radius.
Embodiment 6: referring to Fig. 6, as 4,6 example 3 gained of embodiment watt type semi-solid preparation list composite core 3 and the 1 circular semi-solid preparation list of example 1 gained composite core 1, be twisted into composite core by two layers of 1+6.
Embodiment 7: referring to Fig. 7, as embodiment 4, by the semi-solid preparation list composite core that 19 previous embodiment obtain, press the stranded composition composite core of 1+6+12 structure.Wherein 1, center is circular section composite core 1, and all the other 18 is a watt type composite core 3.
Embodiment 8: referring to Fig. 8, and as aforementioned, twisted composite core, three layers are stranded, the center is the single composite core 1 of circle, and the second layer is outer watt of type list composite core 3, and outermost layer is the single composite core 1 of circle, dipping flexible resin when stranded, making between each single composite core has barras 4, stranded rear thorough curing.
to those skilled in the art, under this patent design and specific embodiment enlightenment, some distortion that can directly derive or associate from this patent disclosure and general knowledge, those of ordinary skills will recognize also can adopt additive method, or the substituting of known technology commonly used in prior art, and the mutual various combination between feature, for example the twisted cores number of plies and each layer radical change, stranded each single composite core changes of section, each single composite core cross section changes according to the design load, each single composite core requires the fiber configuration variation according to design tensile strength, single composite core outer layer thickness changes, stranded rear skin is again by the vertical bag of fiber cloth, the flexible resin kind is different, temperature resistant grade is different, the inside and outside resin solidification time is according to technique change, stranded lay ratio changes, stranded mode changes, etc. unsubstantiality change, can be employed equally, can realize this patent representation function and effect, launch for example no longer one by one to describe in detail, all belong to this patent protection range.
Claims (11)
1. aerial condutor is with continuous high-intensity fiber resin-based composite core, comprise the resin solidification polymerization of at least a continuous high-intensity fiber through vitrification point 〉=180 ℃, it is characterized in that composite core is by many stranded the forming of single composite core, described single composite core is at least by inner fiber resin core and outer layer fiber resin core compound composition with one heart, wherein the outer layer fiber cured resin except sandwich layer is the flexible resin of vitrification point 〉=180 ℃ at least, outer layer thickness 0.5～3mm, after outermost resin solidifies, percentage elongation is greater than the internal layer core, compression strength is lower than the internal layer core, percentage elongation after outermost resin solidifies 〉=8%, compression strength 〉=50MPA.
2. aerial condutor with continuous high-intensity fiber resin-based composite core, is characterized in that ectonexine plexiglas temperature 〉=200 ℃ according to claim 1.
3. aerial condutor with continuous high-intensity fiber resin-based composite core, is characterized in that ectonexine plexiglas temperature 〉=210 ℃ according to claim 2.
4. aerial condutor with continuous high-intensity fiber resin-based composite core, is characterized in that single composite core sectional area 3～15mm according to claim 1
2
5. aerial condutor with continuous high-intensity fiber resin-based composite core, is characterized in that stranded number of plies layer 2-4 according to claim 4.
6. aerial condutor with continuous high-intensity fiber resin-based composite core, is characterized in that the whole tensile strength 2500～4000Mpa of internal layer core according to claim 1.
7. aerial condutor with continuous high-intensity fiber resin-based composite core, is characterized in that 2-5 minute resin solidification time according to claim 1.
8. aerial condutor with continuous high-intensity fiber resin-based composite core, is characterized in that stranded outermost layer is non-round line according to claim 1.
according to claim 1-8 the described aerial condutor of any one with the preparation method of continuous high-intensity fiber resin-based composite core, comprise the high-intensity fiber impregnating resin, the hot curing typing, it is characterized in that flooding when single composite core is stranded flexible resin, the fiber impregnated resin heating obtains semi-solid preparation list composite core, many stranded after, be heated to solidify fully.
10. aerial condutor with the preparation method of continuous high-intensity fiber resin-based composite core, is characterized in that 5～25 times of stranded lay ratios according to claim 9.
11. according to claim 9 or 10 described aerial condutors with the preparation method of continuous high-intensity fiber resin-based composite core, is characterized in that the outer wrapped or vertical bag of many twisted cores after stranded and low modulus fiber silk, net, felt, the cloth of flexible resin dipping are arranged.
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| CN102708941B (en) * | 2012-06-27 | 2014-11-19 | 嘉兴宝盈通复合材料有限公司 | Cable core and cable comprising same |
| CN103578665B (en) * | 2012-07-25 | 2016-04-27 | 远东电缆有限公司 | Overhead transmission line stranded fiber strengthens the preparation method of resin-based composite core |
| CN103198902B (en) * | 2013-04-08 | 2016-04-27 | 远东电缆有限公司 | A kind of Stranding-type compound core and manufacture method thereof |
| CN103887023B (en) * | 2014-04-02 | 2017-07-11 | 江苏福芯电力科技有限公司 | A kind of resin base reinforcing fiber composite core and aerial condutor and its manufacture method |
| CN104900320B (en) * | 2015-06-11 | 2017-03-01 | 远东电缆有限公司 | A kind of wisdom energy super flexible strand type carbon fiber complex core and preparation method thereof |
| CN107103955A (en) * | 2017-05-23 | 2017-08-29 | 成都飞航沛腾科技有限公司 | A kind of composite cable with tension function |
| CN111564243B (en) * | 2018-12-27 | 2021-10-29 | 广西纵览线缆集团有限公司 | Heat-resistant aluminum alloy conductor |
| JP2021036495A (en) * | 2019-08-30 | 2021-03-04 | 矢崎総業株式会社 | Extrusion flexible flat cable and wire harness |
| CN112102981B (en) * | 2020-09-21 | 2021-04-16 | 江苏易鼎复合技术有限公司 | Metal-clad composite molded line stranded reinforced core overhead conductor and manufacturing method thereof |
| CN113035416B (en) * | 2021-03-07 | 2022-10-04 | 广东电网有限责任公司广州供电局 | Low-voltage flexible cable |
| CN115287924B (en) * | 2022-08-25 | 2024-02-13 | 华纤科学技术(深圳)集团有限公司 | Basalt fiber cable and production method thereof |
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