CN104744804B - A kind of preparation method of low noise EVA CABLE MATERIALS - Google Patents
A kind of preparation method of low noise EVA CABLE MATERIALS Download PDFInfo
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- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
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- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
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Abstract
The present invention provides a kind of preparation method of low noise EVA CABLE MATERIALS, and its step is as follows：(1) add after crushing natural coral in sodium hydroxide solution, ultrasonic wave cleaning after immersion, after taking-up, drying, obtain coral powder；(2) by coral powder ball milling, add in ethanol solution and suspension is mixed into, magnetic agitation after polyethylene glycol is added, it is vacuum dried after discharging, takes out, grinds, sieves, obtain modified coral powder；(3) nanometer boron fibre is added in toluene solution and soaks, dry to constant weight, add water bath with thermostatic control in liquor potassic permanganate to process, discharge, dry to constant weight, obtain modified Nano boron fibre；(4) modified coral powder, EVA glue are mixed, mixed glue solution is obtained, modified Nano boron fibre is immersed in mixed glue solution, wound in parallel, cutting, unidirectional fibre prepreg cloth is put into flat plate mold, it is put into hot-forming in hot press, obtains low noise EVA CABLE MATERIALS.The noise resistance better performances of the CABLE MATERIALS that the present invention is prepared, can be used for low noise cable.
Description
Technical field：
The present invention relates to a kind of CABLE MATERIALS, more particularly to a kind of preparation method of low noise EVA CABLE MATERIALS.
Background technology：
EVA, Chinese entitled ethylene-vinyl acetate copolymer, is the 4th big ethene system after HDPE, LDPE, LLDPE
Row copolymer, with the increase of vinyl acetate (VA) content, the elasticity of EVA, flexibility, cohesive, compatibility, transparent and molten
Solution property also accordingly improves.3 big class can be divided into by the wherein content of VA：VA content in 5%-40%, commonly referred to as EVA resin,
It is mainly used to PE modified, manufacture wire cable material, film and other moulded products and compound etc.；VA content exists
40%-70%'s, commonly referred to as EVA elastomer, is mainly used as rubber elastomer, PVC modifier and auto industry part etc.；VA
Content is usually made emulsion state in 70%-95%, and referred to as EVA emulsion, is mainly used as adhesive and coating, coating.
For example, Publication No. CN103980603A, publication date are 2014.08.13, apply for artificial Guangdong China acoustic-electric device share
The Chinese patent of Co., Ltd discloses " EVA/ white carbon component-type irradiation cross-linked wire and cable material and preparation method thereof ", the electricity
Raw material of the line CABLE MATERIALS comprising following weight portion：EVA100 part, white carbon 5-25 part, fire retardant 25-55 part, coupling agent 1.5-
5.5 parts, crosslinking agent 1-2.5 part, antioxidant 1-2.5 part, maleic anhydride grafts compatilizer 5-10 part, lubricant 1-5.5 part；Should
Invention is additionally provided the preparation method of the wire cable material and is handed over using the EVA/ white carbon component-type irradiation of the wire cable material
Connection electric wire and preparation method thereof.The irradiation cross-linked wire and cable that the invention is provided possesses following characteristics：1st, mechanical property is excellent
Different, with high tensile strength；2nd, fire resistance, heat aging performance, have excellent weather resistance；3rd, processability is good, production efficiency is high, with
Coefficient of friction between screw rod is low, improves the service life of screw rod.The but noise resistance of the wire cable material that the invention is provided
Poor-performing, the level of noise of the cable being made from are more than 5mv, it is impossible to for low noise cable (level of noise≤5mv), limit
Its range of application.
Content of the invention：
The technical problem to be solved in the present invention is to provide a kind of preparation method of low noise EVA CABLE MATERIALS, the electricity for preparing
The noise resistance better performances of cable material, can be used for low noise cable.
For solving above-mentioned technical problem, the technical scheme is that：
A kind of preparation method of low noise EVA CABLE MATERIALS, its step are as follows：
(1) by natural coral with adding in sodium hydroxide solution after pulverizer crushing, acetone soln is moved to after soaking 2 hours
Middle ultrasonic wave is cleaned 30 minutes, take out, dry 3 hours after obtain coral powder；
(2) coral powder for obtaining step (1) ball mill ball milling 10 hours, adds stirring in ethanol solution to be mixed into outstanding
Supernatant liquid, polyethylene glycol is added magnetic agitation 2 hours after suspension, is placed in vacuum drying 10 in vacuum drying chamber little after discharging
When, take out, grind, 300 mesh sieves are crossed, obtain modified coral powder；
(3) nanometer boron fibre is added in toluene solution and soaks 48 hours, be placed in drying box and dry to constant weight, add high
In potassium manganate solution, water bath with thermostatic control is processed 5 minutes, is discharged, is dry to constant weight, obtains modified Nano boron fibre；
(4) the modified coral powder for obtaining step (2), EVA glue mixer mix 5 minutes, obtain mixed glue solution, will
In the modified Nano boron fibre immersion mixed glue solution that step (3) is obtained, wound in parallel, the cutting on wrapping machine with flat core
For unidirectional fibre prepreg cloth, flat plate mold will be put into after unidirectional for unidirectional fibre prepreg cloth laying, flat plate mold is put into hot press
In hot-forming, obtain low noise EVA CABLE MATERIALS.
Preferably, in of the present invention to step (1), the mass fraction of sodium hydroxide solution is 10%.
Preferably, in of the present invention to step (1), temperature when drying is 80 DEG C.
Preferably, in of the present invention to step (2), coral powder, ethanol solution, the weight ratio of polyethylene glycol are 48:48:1.
Preferably, in of the present invention to step (2), the mass fraction of ethanol solution is 40%.
Preferably, in of the present invention to step (2), temperature during vacuum drying is 90 DEG C.
Preferably, in of the present invention to step (3), the mass fraction of potassium permanganate is 5%.
Preferably, in of the present invention to step (3), temperature during water bath with thermostatic control is 70 DEG C.
Preferably, in of the present invention to step (4), count by weight, modified coral powder 9-14 part, EVA glue 100
Part, modified Nano boron fibre 12-18 part.
Preferably, in of the present invention to step (4), hot-forming temperature is 100 DEG C, and pressure is 70MPa.
Compared with prior art, the invention has the advantages that：
(1) natural coral is the oozy shell of coral polyp, and its main chemical compositions is CaCO3, with crystallite calcite collection
Fit form is present, and with loose structure, natural coral surface is in hydrophily and surface energy is higher, through sodium hydroxide alkali
After change is processed, its surface energy is substantially reduced, and compatilizer polyethylene glycol is greatly improved the EVA of hydrophilic coral powder and oleophylic
Between compatibility so that coral powder is can be uniformly dispersed in EVA, and the loose structure of coral powder defines distance relatively in EVA
Long duct, when cable is subject to outside garbage signal interference and radiates, the duct of long range can effectively consume attenuated signal
Interference and radiation, so as to effectively improve the noise resistance performance of CABLE MATERIALS, reduce the level of noise of cable.
(2) nanometer boron fibre is the boron fibre through nanotechnology treatments, with high intensity, high resiliency and resistant to elevated temperatures spy
Property, its smooth surface simultaneously assume larger inertia, and nanometer boron fibre generates active group after the surface oxidation of potassium permanganate
Group, defines cross-linked network with the active group of EVA matrix after pre-preg so that nanometer boron fibre and EVA matrix it
Between adhesion be significantly improved, the useless interference signal in the outside is subject to by cable defines effectively shielding and suppression and makees
With further increasing the noise resistance performance of CABLE MATERIALS；Additionally, the resistance to elevated temperatures of nanometer boron fibre is preferably, can effectively improve
The thermal coefficient of expansion of CABLE MATERIALS, reduces the difference of the thermal coefficient of expansion between CABLE MATERIALS and metallic conductor, so as to effectively reduce
Thermal noise produced by fuel factor, can reduce the level of noise of cable further.
Specific embodiment：
Describe the present invention, the illustrative examples of the here present invention and explanation below in conjunction with specific embodiment in detail
It is used for explaining the present invention, but not as a limitation of the invention.
Embodiment 1
A kind of preparation method of low noise EVA CABLE MATERIALS, its step are as follows：
(1) will add mass fraction after the crushing of natural coral pulverizer is that immersion 2 is little in 10% sodium hydroxide solution
When after move in acetone soln ultrasonic wave and clean 30 minutes, take out, dry 3 hours at 80 DEG C after obtain coral powder；
(2) coral powder for obtaining step (1) ball mill ball milling 10 hours, the ethanol for adding mass fraction to be 40% are molten
In liquid, stirring is mixed into suspension, polyethylene glycol is added magnetic agitation 2 hours after suspension, is placed in vacuum drying chamber after discharging
In be vacuum dried 10 hours at 90 DEG C, take out, grinding, cross 300 mesh sieves, obtain modified coral powder, wherein, coral powder, ethanol are molten
Liquid, the weight ratio of polyethylene glycol are 48:48:1；
(3) nanometer boron fibre is added in toluene solution and soaks 48 hours, be placed in drying box and dry to constant weight, add matter
Water bath with thermostatic control at measuring 70 DEG C in the liquor potassic permanganate that fraction is 5% is processed 5 minutes, is discharged, is dry to constant weight, obtains modification and receive
Rice boron fibre；
(4) count by weight, the modified coral powder that 9 parts of steps (2) are obtained, 100 parts of EVA glues are mixed with mixer
5 minutes, mixed glue solution is obtained, in the modified Nano boron fibre immersion mixed glue solution that 17 parts of steps (3) are obtained, use flat core
Mould wound in parallel on wrapping machine, is cut into unidirectional fibre prepreg cloth, will be put into flat board after unidirectional for unidirectional fibre prepreg cloth laying
Mould, flat plate mold is put into hot-forming in hot press, obtains low noise EVA CABLE MATERIALS, and wherein, hot-forming temperature is
100 DEG C, pressure is 70MPa.
Embodiment 2
A kind of preparation method of low noise EVA CABLE MATERIALS, its step are as follows：
(1) will add mass fraction after the crushing of natural coral pulverizer is that immersion 2 is little in 10% sodium hydroxide solution
When after move in acetone soln ultrasonic wave and clean 30 minutes, take out, dry 3 hours at 80 DEG C after obtain coral powder；
(2) coral powder for obtaining step (1) ball mill ball milling 10 hours, the ethanol for adding mass fraction to be 40% are molten
In liquid, stirring is mixed into suspension, polyethylene glycol is added magnetic agitation 2 hours after suspension, is placed in vacuum drying chamber after discharging
In be vacuum dried 10 hours at 90 DEG C, take out, grinding, cross 300 mesh sieves, obtain modified coral powder, wherein, coral powder, ethanol are molten
Liquid, the weight ratio of polyethylene glycol are 48:48:1；
(3) nanometer boron fibre is added in toluene solution and soaks 48 hours, be placed in drying box and dry to constant weight, add matter
Water bath with thermostatic control at measuring 70 DEG C in the liquor potassic permanganate that fraction is 5% is processed 5 minutes, is discharged, is dry to constant weight, obtains modification and receive
Rice boron fibre；
(4) count by weight, the modified coral powder that 12 parts of steps (2) are obtained, 100 parts of EVA glue mixers are mixed
Close 5 minutes, mixed glue solution is obtained, in modified Nano boron fibre that 18 parts of steps (3) are obtained immersion mixed glue solution, with flat
Core wound in parallel on wrapping machine, is cut into unidirectional fibre prepreg cloth, flat by being put into after unidirectional for unidirectional fibre prepreg cloth laying
Board mold, flat plate mold is put into hot-forming in hot press, obtains low noise EVA CABLE MATERIALS, wherein, hot-forming temperature
For 100 DEG C, pressure is 70MPa.
Embodiment 3
A kind of preparation method of low noise EVA CABLE MATERIALS, its step are as follows：
(1) will add mass fraction after the crushing of natural coral pulverizer is that immersion 2 is little in 10% sodium hydroxide solution
When after move in acetone soln ultrasonic wave and clean 30 minutes, take out, dry 3 hours at 80 DEG C after obtain coral powder；
(2) coral powder for obtaining step (1) ball mill ball milling 10 hours, the ethanol for adding mass fraction to be 40% are molten
In liquid, stirring is mixed into suspension, polyethylene glycol is added magnetic agitation 2 hours after suspension, is placed in vacuum drying chamber after discharging
In be vacuum dried 10 hours at 90 DEG C, take out, grinding, cross 300 mesh sieves, obtain modified coral powder, wherein, coral powder, ethanol are molten
Liquid, the weight ratio of polyethylene glycol are 48:48:1；
(3) nanometer boron fibre is added in toluene solution and soaks 48 hours, be placed in drying box and dry to constant weight, add matter
Water bath with thermostatic control at measuring 70 DEG C in the liquor potassic permanganate that fraction is 5% is processed 5 minutes, is discharged, is dry to constant weight, obtains modification and receive
Rice boron fibre；
(4) count by weight, the modified coral powder that 10 parts of steps (2) are obtained, 100 parts of EVA glue mixers are mixed
Close 5 minutes, mixed glue solution is obtained, in modified Nano boron fibre that 16 parts of steps (3) are obtained immersion mixed glue solution, with flat
Core wound in parallel on wrapping machine, is cut into unidirectional fibre prepreg cloth, flat by being put into after unidirectional for unidirectional fibre prepreg cloth laying
Board mold, flat plate mold is put into hot-forming in hot press, obtains low noise EVA CABLE MATERIALS, wherein, hot-forming temperature
For 100 DEG C, pressure is 70MPa.
Embodiment 4
A kind of preparation method of low noise EVA CABLE MATERIALS, its step are as follows：
(1) will add mass fraction after the crushing of natural coral pulverizer is that immersion 2 is little in 10% sodium hydroxide solution
When after move in acetone soln ultrasonic wave and clean 30 minutes, take out, dry 3 hours at 80 DEG C after obtain coral powder；
(2) coral powder for obtaining step (1) ball mill ball milling 10 hours, the ethanol for adding mass fraction to be 40% are molten
In liquid, stirring is mixed into suspension, polyethylene glycol is added magnetic agitation 2 hours after suspension, is placed in vacuum drying chamber after discharging
In be vacuum dried 10 hours at 90 DEG C, take out, grinding, cross 300 mesh sieves, obtain modified coral powder, wherein, coral powder, ethanol are molten
Liquid, the weight ratio of polyethylene glycol are 48:48:1；
(3) nanometer boron fibre is added in toluene solution and soaks 48 hours, be placed in drying box and dry to constant weight, add matter
Water bath with thermostatic control at measuring 70 DEG C in the liquor potassic permanganate that fraction is 5% is processed 5 minutes, is discharged, is dry to constant weight, obtains modification and receive
Rice boron fibre；
(4) count by weight, the modified coral powder that 14 parts of steps (2) are obtained, 100 parts of EVA glue mixers are mixed
Close 5 minutes, mixed glue solution is obtained, in modified Nano boron fibre that 15 parts of steps (3) are obtained immersion mixed glue solution, with flat
Core wound in parallel on wrapping machine, is cut into unidirectional fibre prepreg cloth, flat by being put into after unidirectional for unidirectional fibre prepreg cloth laying
Board mold, flat plate mold is put into hot-forming in hot press, obtains low noise EVA CABLE MATERIALS, wherein, hot-forming temperature
For 100 DEG C, pressure is 70MPa.
Embodiment 5
A kind of preparation method of low noise EVA CABLE MATERIALS, its step are as follows：
(1) will add mass fraction after the crushing of natural coral pulverizer is that immersion 2 is little in 10% sodium hydroxide solution
When after move in acetone soln ultrasonic wave and clean 30 minutes, take out, dry 3 hours at 80 DEG C after obtain coral powder；
(2) coral powder for obtaining step (1) ball mill ball milling 10 hours, the ethanol for adding mass fraction to be 40% are molten
In liquid, stirring is mixed into suspension, polyethylene glycol is added magnetic agitation 2 hours after suspension, is placed in vacuum drying chamber after discharging
In be vacuum dried 10 hours at 90 DEG C, take out, grinding, cross 300 mesh sieves, obtain modified coral powder, wherein, coral powder, ethanol are molten
Liquid, the weight ratio of polyethylene glycol are 48:48:1；
(3) nanometer boron fibre is added in toluene solution and soaks 48 hours, be placed in drying box and dry to constant weight, add matter
Water bath with thermostatic control at measuring 70 DEG C in the liquor potassic permanganate that fraction is 5% is processed 5 minutes, is discharged, is dry to constant weight, obtains modification and receive
Rice boron fibre；
(4) count by weight, the modified coral powder that 11 parts of steps (2) are obtained, 100 parts of EVA glue mixers are mixed
Close 5 minutes, mixed glue solution is obtained, in modified Nano boron fibre that 12 parts of steps (3) are obtained immersion mixed glue solution, with flat
Core wound in parallel on wrapping machine, is cut into unidirectional fibre prepreg cloth, flat by being put into after unidirectional for unidirectional fibre prepreg cloth laying
Board mold, flat plate mold is put into hot-forming in hot press, obtains low noise EVA CABLE MATERIALS, wherein, hot-forming temperature
For 100 DEG C, pressure is 70MPa.
Embodiment 6
A kind of preparation method of low noise EVA CABLE MATERIALS, its step are as follows：
(1) will add mass fraction after the crushing of natural coral pulverizer is that immersion 2 is little in 10% sodium hydroxide solution
When after move in acetone soln ultrasonic wave and clean 30 minutes, take out, dry 3 hours at 80 DEG C after obtain coral powder；
(2) coral powder for obtaining step (1) ball mill ball milling 10 hours, the ethanol for adding mass fraction to be 40% are molten
In liquid, stirring is mixed into suspension, polyethylene glycol is added magnetic agitation 2 hours after suspension, is placed in vacuum drying chamber after discharging
In be vacuum dried 10 hours at 90 DEG C, take out, grinding, cross 300 mesh sieves, obtain modified coral powder, wherein, coral powder, ethanol are molten
Liquid, the weight ratio of polyethylene glycol are 48:48:1；
(3) nanometer boron fibre is added in toluene solution and soaks 48 hours, be placed in drying box and dry to constant weight, add matter
Water bath with thermostatic control at measuring 70 DEG C in the liquor potassic permanganate that fraction is 5% is processed 5 minutes, is discharged, is dry to constant weight, obtains modification and receive
Rice boron fibre；
(4) count by weight, the modified coral powder that 13 parts of steps (2) are obtained, 100 parts of EVA glue mixers are mixed
Close 5 minutes, mixed glue solution is obtained, in modified Nano boron fibre that 14 parts of steps (3) are obtained immersion mixed glue solution, with flat
Core wound in parallel on wrapping machine, is cut into unidirectional fibre prepreg cloth, flat by being put into after unidirectional for unidirectional fibre prepreg cloth laying
Board mold, flat plate mold is put into hot-forming in hot press, obtains low noise EVA CABLE MATERIALS, wherein, hot-forming temperature
For 100 DEG C, pressure is 70MPa.
To be tested using the level of noise of CABLE MATERIALS obtained in embodiment 1-6 and the cable made by comparative example, its
In,
Comparative example is the Chinese patent of Publication No. CN103980603A；
Level of noise presses GB/T17737.1 test.
Test result is as follows：
As seen from the above table, the level of noise of the cable made by CABLE MATERIALS obtained in the present invention is significantly lower than comparative example, meets
The standard of low noise cable.
Above-described embodiment only principle of the illustrative present invention and its effect, not for the restriction present invention.Any ripe
The personage for knowing this technology all can carry out modifications and changes without prejudice under the spirit and the scope of the present invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete with institute under technological thought without departing from disclosed spirit such as
All equivalent modifications for becoming or change, must be covered by the claim of the present invention.
Claims (10)
1. a kind of preparation method of low noise EVA CABLE MATERIALS, it is characterised in that：Its step is as follows：
(1) by natural coral with adding in sodium hydroxide solution after pulverizer crushing, move to after soaking 2 hours in acetone soln and surpass
Sound wave clean 30 minutes, take out, dry 3 hours after obtain coral powder；
(2) coral powder for obtaining step (1) ball mill ball milling 10 hours, adds stirring in ethanol solution to be mixed into suspension
Liquid, polyethylene glycol is added magnetic agitation 2 hours after suspension, is placed in vacuum drying chamber and is vacuum dried 10 hours after discharging,
Take out, grind, 300 mesh sieves are crossed, obtain modified coral powder；
(3) nanometer boron fibre is added in toluene solution and soaks 48 hours, be placed in drying box and dry to constant weight, add permanganic acid
In potassium solution, water bath with thermostatic control is processed 5 minutes, is discharged, is dry to constant weight, obtains modified Nano boron fibre；
(4) the modified coral powder for obtaining step (2), EVA glue mixer mix 5 minutes, obtain mixed glue solution, by step
(3) obtain modified Nano boron fibre immersion mixed glue solution in, with flat core on wrapping machine wound in parallel, be cut into list
To Fiber prepreg, flat plate mold will be put into after unidirectional for unidirectional fibre prepreg cloth laying, flat plate mold is put into heat in hot press
Molded, obtain low noise EVA CABLE MATERIALS.
2. the preparation method of a kind of low noise EVA CABLE MATERIALS according to claim 1, it is characterised in that：Step (1)
In, the mass fraction of sodium hydroxide solution is 10%.
3. the preparation method of a kind of low noise EVA CABLE MATERIALS according to claim 1, it is characterised in that：Step (1)
In, temperature when drying is 80 DEG C.
4. the preparation method of a kind of low noise EVA CABLE MATERIALS according to claim 1, it is characterised in that：Step (2)
In, coral powder, ethanol solution, the weight ratio of polyethylene glycol are 48:48:1.
5. the preparation method of a kind of low noise EVA CABLE MATERIALS according to claim 1, it is characterised in that：Step (2)
In, the mass fraction of ethanol solution is 40%.
6. the preparation method of a kind of low noise EVA CABLE MATERIALS according to claim 1, it is characterised in that：Step (2)
In, temperature during vacuum drying is 90 DEG C.
7. the preparation method of a kind of low noise EVA CABLE MATERIALS according to claim 1, it is characterised in that：Step (3)
In, the mass fraction of potassium permanganate is 5%.
8. the preparation method of a kind of low noise EVA CABLE MATERIALS according to claim 1, it is characterised in that：Step (3)
In, temperature during water bath with thermostatic control is 70 DEG C.
9. the preparation method of a kind of low noise EVA CABLE MATERIALS according to claim 1, it is characterised in that：Step (4)
In, count by weight, modified coral powder 9-14 part, 100 parts of EVA glue, modified Nano boron fibre 12-18 part.
10. the preparation method of a kind of low noise EVA CABLE MATERIALS according to claim 1, it is characterised in that：The step
(4) in, hot-forming temperature is 100 DEG C, and pressure is 70MPa.
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| CN201758030U (en) * | 2010-07-09 | 2011-03-09 | 安徽华通电缆集团有限公司 | Physical foaming polyolefin insulation low-noise cable |
| CN202067582U (en) * | 2011-05-23 | 2011-12-07 | 天津六0九电缆有限公司 | Special type low-noise cable for sensor |
| CN102280177A (en) * | 2011-05-23 | 2011-12-14 | 天津六○九电缆有限公司 | Special type low-noise cable for sensor |
| CN102831967A (en) * | 2012-08-30 | 2012-12-19 | 江苏永鼎电气有限公司 | High-temperature-resistant low-noise cable |
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| JPS5614540A (en) * | 1979-07-14 | 1981-02-12 | Shinshin Sangyo Kk | Preparation of fire-retarding synthetic resin |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201758030U (en) * | 2010-07-09 | 2011-03-09 | 安徽华通电缆集团有限公司 | Physical foaming polyolefin insulation low-noise cable |
| CN202067582U (en) * | 2011-05-23 | 2011-12-07 | 天津六0九电缆有限公司 | Special type low-noise cable for sensor |
| CN102280177A (en) * | 2011-05-23 | 2011-12-14 | 天津六○九电缆有限公司 | Special type low-noise cable for sensor |
| CN102831967A (en) * | 2012-08-30 | 2012-12-19 | 江苏永鼎电气有限公司 | High-temperature-resistant low-noise cable |
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