CN111690215A - Flame-retardant cable sheath and preparation method thereof - Google Patents
Flame-retardant cable sheath and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the field of wires and cables, and particularly discloses a flame-retardant cable sheath and a preparation method thereof, wherein the sheath is prepared from the following raw materials in parts by weight: 90-100 parts of polyvinyl chloride; 4-7 parts of titanium dioxide nano fibers; 1-2 parts of antimony trioxide; 4-6 parts of trichloroethyl phosphate. Polyvinyl chloride (PVC) has good flame retardant property, and SbCl generated from Cl and Sb during combustion of the PVC3Can capture free radicals and isolate air. Therefore, antimony trioxide added into the polyvinyl chloride can generate a good flame retardant effect on the polyvinyl chloride. The titanium dioxide nano-fiber provides a skeleton supporting effect for the system in the process of carbon formation in the process of thermal degradation of the polymer, so that amorphous carbon particles are attached to the network skeleton to generate a continuous compact and less-hole blocking carbon layer, the blocking effect of the expanded carbon layer on the polymer, a heat source and oxygen is enhanced, the further combustion process of the polymer is delayed, and the limiting oxygen index of the system is improved.
Description
Technical Field
The invention relates to the field of wires and cables, in particular to a flame-retardant cable sheath and a preparation method thereof.
Background
The wire and cable is a wire product for transmitting electric energy and information and realizing electromagnetic energy conversion, and mainly comprises a guide core and a sheath, wherein the sheath is sleeved on the guide core to play a good role in protecting the guide core.
Chinese patent No. CN205751670U discloses a cross-linked pvc insulated pvc sheathed power cable, which comprises an insulated pvc sheath, a copper core wire and two testing wires arranged side by side, wherein the copper core wire and the testing wires are arranged in the sheath, the outer surface of the copper core wire is wrapped with a flame retardant coating, the outer surface of the flame retardant coating is wrapped with a cross-linked pvc insulating layer, and two testing wires are connected in parallel with each other with a resistor at intervals of 15-20 m.
In the technical scheme, the insulating polyvinyl chloride sheath is directly adopted, so that the flame retardant effect is limited and needs to be improved.
Disclosure of Invention
Aiming at the problem that the flame-retardant effect of a sheath layer is limited in the prior art, the first purpose of the invention is to provide a flame-retardant cable sheath which has the advantage of good flame-retardant effect.
The second purpose of the invention is to provide a preparation method of the flame-retardant cable sheath, and the preparation method has the advantage that the prepared product has a good flame-retardant effect.
In order to achieve the first object, the invention provides the following technical scheme: the flame-retardant cable sheath comprises the following raw materials in parts by weight:
90-100 parts of polyvinyl chloride;
4-7 parts of titanium dioxide nano fibers;
1-2 parts of antimony trioxide;
4-6 parts of trichloroethyl phosphate.
By adopting the technical scheme, the polyvinyl chloride (PVC) has good flame retardant property, and the polyvinyl chloride generates SbCl from Cl and Sb during combustion3Can capture free radicals and isolate air. Therefore, antimony trioxide added into the polyvinyl chloride can generate a good flame retardant effect on the polyvinyl chloride.
The titanium dioxide nano fiber is used as an additive with a nano tubular structure, and the tensile property and the bending property of a system can be improved to a certain extent by adding a small amount of the titanium dioxide nano fiber. And the titanium dioxide nano-fiber provides a skeleton supporting effect for the system in the process of carbon formation in the process of thermal degradation of the polymer, so that amorphous carbon particles are attached to the network skeleton to generate a continuous compact and less-porous barrier carbon layer, the barrier effect of the expanded carbon layer on the polymer, a heat source and oxygen is enhanced, and the further combustion process of the polymer is delayed. In addition, the titanium dioxide nano-fiber has strong adsorbability to oxygen, and in a combustion area, the titanium dioxide nano-fiber can adsorb oxygen in the atmosphere to the deep surface and the periphery, so that the oxygen concentration of other areas in the system is relatively reduced, the thermal degradation process of the system is further delayed, and the limit oxygen index of the system is improved.
The phosphoric acid trichloroethyl ester is a phosphate flame retardant, and the flame retardant effect of the system can be further improved by adding the phosphoric acid trichloroethyl ester into the system.
Further, the raw materials also comprise 4-6 parts of zinc borate by weight.
By adopting the technical scheme, the zinc borate is covered on the surface of the system after being melted in the combustion process, so that oxygen cannot contact with the combustion surface, and the protective effect on the further oxidation of the carbon layer is achieved. And the zinc borate and the antimony trioxide have synergistic effect, so that the smoke generation amount can be obviously reduced.
Further, the mass ratio of the antimony trioxide to the trichloroethyl phosphate to the zinc borate is 1: 5: 5.
by adopting the technical scheme, when the mass ratio of the antimony trioxide to the trichloroethyl phosphate to the zinc borate is 1: 5: and 5, the flame retardant has the best synergistic flame retardant effect.
Further, the raw materials also comprise 25-28 parts of aluminum hypophosphite in parts by weight.
By adopting the technical scheme, the aluminum hypophosphite has high phosphorus content, belongs to a phosphorus flame retardant, and combines a gas-phase flame retardant mechanism and a condensed flame retardant mechanism, namely, the aluminum hypophosphite is heated and decomposed to generate PO & free radicals when a polymer is burnt, and can capture the free radicals HO & H & so as to reduce the concentration of high-energy free radicals in a gas phase, inhibit or terminate the chain reaction of the free radicals and play a role in gas-phase flame retardance; in the condensed phase, a portion of the aluminum hypophosphite is thermally decomposed to Al (PO)4)、Al4(P2O2)3High temperature resistant phosphate covers the surface of the combustion system to form an isolating film; the other part generates free radicals containing P and P & lt + & gt, and the free radicals further react with-OH and-NH in the polymer2Bonding reaction of Al3+The polymer matrix is promoted to perform a series of reactions such as 'heat absorption-dehydration-carbon formation' and the like through the reaction with POO to generate a carbon layer, and the condensed flame retardant effect is achieved.
In addition, the zinc borate and the aluminum hypophosphite have good synergistic flame retardant effect, and when the mass ratio of the aluminum hypophosphite to the zinc borate is 21: 4, the two have the best synergistic effect. And aluminum hypophosphite and zinc borate can promote the carbonization of the system during pyrolysis, so that the thermal stability of the system is improved. The carbon layer produced by singly using the aluminum hypophosphite is loose and easy to crack, and cannot play a good blocking role, and the carbon layer formed by simultaneously using the aluminum hypophosphite and the zinc borate is continuous and compact, which is attributed to the sealing effect of the zinc borate on holes and cracks in the carbon layer.
Further, the raw materials also comprise 10-14 parts of ammonium polyphosphate by weight.
By adopting the technical scheme, the ammonium polyphosphate can expand rapidly to generate a gas foam layer when being heated, so that the fire-resistant time is greatly prolonged, the ammonium polyphosphate decomposes at high temperature to release ammonia gas and generate phosphoric acid, the ammonia gas can dilute oxygen around the material to inhibit oxidation reaction, and the phosphoric acid can react with hydroxyl in organic matters to generate phosphate and water, so that the material is dehydrated and carbonized, and the heat conduction is inhibited. In addition, the glassy liquid polyphosphoric acid generated at high temperature also plays roles of heat insulation and oxygen isolation to inhibit the combustion of the material, thereby further improving the flame retardant effect of the system.
Further, the raw materials also comprise 3-6 parts of pentaerythritol in parts by weight.
By adopting the technical scheme, pentaerythritol can be used as a carbon source of ammonium polyphosphate, so that a combustion surface in a combustion process can be fully carbonized, and the flame retardant effect of a system is further improved.
Further, the raw materials also comprise 2-3 parts of zinc sulfate according to parts by weight.
By adopting the technical scheme, the zinc sulfate and the ammonium polyphosphate have higher reactivity, a bridge bond is formed between the ammonium polyphosphate, the thermal degradation speed of the ammonium polyphosphate is reduced, and the gas release process is more matched with the viscosity of the base material of the system; and the zinc sulfate can promote esterification and crosslinking carbon formation reaction of ammonium polyphosphate and pentaerythritol, improve the appearance of the formed expanded carbon layer, better play a role in heat insulation and mass insulation, and improve the flame retardant property of the system.
Further, the zinc sulfate is loaded on the titanium dioxide nano-fiber, and the loading method comprises the following steps:
s1, adding the zinc sulfate saturated solution and the titanium dioxide nano-fiber into a reaction kettle, and reacting for 8-10h at the temperature of 240-260 ℃;
and S2, taking out and drying.
By adopting the technical scheme, the zinc sulfate is loaded on the titanium dioxide nano fiber, so that the interaction force between the titanium dioxide nano fiber and the polymer material in the system can be effectively enhanced, the titanium dioxide nano fiber and the polymer are tightly connected, the interaction force is strong, and the heat-resistant flame-retardant property of the system is further improved.
In order to achieve the second object, the invention provides the following technical scheme: the preparation method of the flame-retardant cable sheath comprises the following steps:
s1, loading zinc sulfate on the titanium dioxide nano-fiber for later use;
s2, heating and melting polyvinyl chloride;
s3, uniformly mixing titanium dioxide nano fibers loaded with zinc sulfate, antimony trioxide, trichloroethyl phosphate, zinc borate, aluminum hypophosphite, ammonium polyphosphate and pentaerythritol;
s4, adding the uniformly mixed additives into the molten polyvinyl chloride, and uniformly stirring;
s5, ultrasonic treatment is carried out for 1-2h, and extrusion molding is carried out.
In conclusion, the invention has the following beneficial effects:
1. polyvinyl chloride (PVC) has good flame retardant property, and SbCl generated from Cl and Sb during combustion of the PVC3Can capture free radicals and isolate air. Therefore, antimony trioxide added into the polyvinyl chloride can generate a good flame retardant effect on the polyvinyl chloride.
2. The titanium dioxide nano fiber is used as an additive with a nano tubular structure, and the tensile property and the bending property of a system can be improved to a certain extent by adding a small amount of the titanium dioxide nano fiber. And the titanium dioxide nano-fiber provides a skeleton supporting effect for the system in the process of carbon formation in the process of thermal degradation of the polymer, so that amorphous carbon particles are attached to the network skeleton to generate a continuous compact and less-porous barrier carbon layer, the barrier effect of the expanded carbon layer on the polymer, a heat source and oxygen is enhanced, and the further combustion process of the polymer is delayed. In addition, the titanium dioxide nano-fiber has strong adsorbability to oxygen, and in a combustion area, the titanium dioxide nano-fiber can adsorb oxygen in the atmosphere to the deep surface and the periphery, so that the oxygen concentration of other areas in the system is relatively reduced, the thermal degradation process of the system is further delayed, and the limit oxygen index of the system is improved.
3. The zinc borate is melted in the combustion process and then covers the surface of the system, so that oxygen cannot contact with the combustion surface, and the protective effect is achieved on the further oxidation of the carbon layer. And the zinc borate and the antimony trioxide have synergistic effect, so that the smoke generation amount can be obviously reduced.
4. The aluminum hypophosphite has high phosphorus content, belongs to a phosphorus flame retardant, and has a flame retardant mechanism combining a gas-phase flame retardant mechanism and a condensed flame retardant mechanism, namely the aluminum hypophosphite is heated and decomposed to generate PO & free radicals when a polymer is burnt, and the PO & free radicals can be captured, so that the concentration of high-energy free radicals in a gas phase is reduced, the free radical chain reaction is inhibited or terminated, and the gas-phase flame retardant effect is achieved; in the condensed phase, a portion of the aluminum hypophosphite is thermally decomposed to Al (PO)4)、Al4(P2O2)3High temperature resistant phosphate covers the surface of the combustion system to form an isolating film; the other part generates free radicals containing P and P & lt + & gt, and the free radicals further react with-OH and-NH in the polymer2Bonding reaction of Al3+The polymer matrix is promoted to perform a series of reactions such as 'heat absorption-dehydration-carbon formation' and the like through the reaction with POO to generate a carbon layer, and the condensed flame retardant effect is achieved.
5. The zinc borate and the aluminum hypophosphite have good synergistic flame retardant effect, and when the mass ratio of the aluminum hypophosphite to the zinc borate is 21: 4, the two have the best synergistic effect. And aluminum hypophosphite and zinc borate can promote the carbonization of the system during pyrolysis, so that the thermal stability of the system is improved. The carbon layer produced by singly using the aluminum hypophosphite is loose and easy to crack, and cannot play a good blocking role, and the carbon layer formed by simultaneously using the aluminum hypophosphite and the zinc borate is continuous and compact, which is attributed to the sealing effect of the zinc borate on holes and cracks in the carbon layer.
6. The zinc sulfate and the ammonium polyphosphate have higher reactivity, form a bridge bond between the ammonium polyphosphate, reduce the thermal degradation speed of the ammonium polyphosphate and enable the release process of the gas to be more matched with the viscosity of the base material of the system; and the zinc sulfate can promote esterification and crosslinking carbon formation reaction of ammonium polyphosphate and pentaerythritol, improve the appearance of the formed expanded carbon layer, better play a role in heat insulation and mass insulation, and improve the flame retardant property of the system.
7. The zinc sulfate is loaded on the titanium dioxide nanofiber, so that the interaction force between the titanium dioxide nanofiber and a polymer material in a system can be effectively enhanced, the titanium dioxide nanofiber and a polymer are tightly connected, the interaction force is strong, and the heat-resistant flame-retardant property of the system is further improved.
Drawings
FIG. 1 is a flow chart of a method provided by the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples.
Examples
Example 1
The flame-retardant cable sheath comprises the raw materials in parts by weight shown in Table 1.
The method comprises the following steps of:
s1, adding the zinc sulfate saturated solution and the titanium dioxide nano-fibers into a reaction kettle, and reacting for 9 hours at 250 ℃;
and S2, taking out and drying.
As shown in fig. 1, the preparation method of the flame-retardant cable sheath comprises the following steps:
s1, loading zinc sulfate on the titanium dioxide nano-fiber for later use;
s2, heating and melting polyvinyl chloride;
s3, uniformly mixing titanium dioxide nano fibers loaded with zinc sulfate, antimony trioxide, trichloroethyl phosphate, zinc borate, aluminum hypophosphite, ammonium polyphosphate and pentaerythritol;
s4, adding the uniformly mixed additives into the molten polyvinyl chloride, and uniformly stirring;
and S5, performing ultrasonic treatment for 1h, and performing extrusion molding.
During the preparation of the sheath, S1 and S2 are not sequential and may be performed simultaneously.
Example 2
The flame-retardant cable sheath comprises the raw materials in parts by weight shown in Table 1.
The preparation method of the flame-retardant cable sheath comprises the following steps:
s1, heating and melting polyvinyl chloride;
s2, uniformly mixing titanium dioxide nano fibers, antimony trioxide, trichloroethyl phosphate, zinc borate, aluminum hypophosphite, ammonium polyphosphate and pentaerythritol;
s3, adding the uniformly mixed additives into the molten polyvinyl chloride, and uniformly stirring;
and S4, performing ultrasonic treatment for 1h, and performing extrusion molding.
Example 3
The flame-retardant cable sheath comprises the raw materials in parts by weight shown in Table 1.
The method comprises the following steps of:
s1, adding the zinc sulfate saturated solution and the titanium dioxide nano-fibers into a reaction kettle, and reacting for 9 hours at 250 ℃;
s2, cooling to room temperature, and washing with distilled water for 5 times;
and S3, taking out and drying.
The preparation method of the flame-retardant cable sheath comprises the following steps:
s1, loading zinc sulfate on the titanium dioxide nano-fiber for later use;
s2, heating and melting polyvinyl chloride;
s3, uniformly mixing titanium dioxide nano fibers loaded with zinc sulfate, antimony trioxide, trichloroethyl phosphate, zinc borate, aluminum hypophosphite, ammonium polyphosphate and pentaerythritol;
s4, adding the uniformly mixed additives into the molten polyvinyl chloride, and uniformly stirring;
and S5, performing ultrasonic treatment for 1h, and performing extrusion molding.
During the preparation of the sheath, S1 and S2 are not sequential and may be performed simultaneously.
Example 4
The flame-retardant cable sheath comprises the raw materials in parts by weight shown in Table 1.
The method comprises the following steps of:
s1, adding the zinc sulfate saturated solution and the titanium dioxide nano-fibers into a reaction kettle, and reacting for 9 hours at 250 ℃;
and S2, taking out and drying.
The preparation method of the flame-retardant cable sheath comprises the following steps:
s1, loading zinc sulfate on the titanium dioxide nano-fiber for later use;
s2, heating and melting polyvinyl chloride;
s3, uniformly mixing titanium dioxide nano fibers loaded with zinc sulfate, antimony trioxide, trichloroethyl phosphate, aluminum hypophosphite, ammonium polyphosphate and pentaerythritol;
s4, adding the uniformly mixed additives into the molten polyvinyl chloride, and uniformly stirring;
and S5, performing ultrasonic treatment for 1h, and performing extrusion molding.
During the preparation of the sheath, S1 and S2 are not sequential and may be performed simultaneously.
Comparative example
Comparative example 1
The flame-retardant cable sheath comprises the raw materials in parts by weight shown in Table 1.
The method comprises the following steps of:
s1, adding the zinc sulfate saturated solution and the titanium dioxide nano-fibers into a reaction kettle, and reacting for 9 hours at 250 ℃;
and S2, taking out and drying.
The preparation method of the flame-retardant cable sheath comprises the following steps:
s1, loading zinc sulfate on the titanium dioxide nano-fiber for later use;
s2, heating and melting polyvinyl chloride;
s3, uniformly mixing titanium dioxide nano fibers loaded with zinc sulfate, antimony trioxide, trichloroethyl phosphate, zinc borate, aluminum hypophosphite, ammonium polyphosphate and pentaerythritol;
s4, adding the uniformly mixed additives into the molten polyvinyl chloride, and uniformly stirring;
and S5, performing ultrasonic treatment for 1h, and performing extrusion molding.
During the preparation of the sheath, S1 and S2 are not sequential and may be performed simultaneously.
Comparative example 2
The flame-retardant cable sheath comprises the raw materials in parts by weight shown in Table 1.
The method comprises the following steps of:
s1, adding the zinc sulfate saturated solution and the titanium dioxide nano-fibers into a reaction kettle, and reacting for 9 hours at 250 ℃;
and S2, taking out and drying.
The preparation method of the flame-retardant cable sheath comprises the following steps:
s1, loading zinc sulfate on the titanium dioxide nano-fiber for later use;
s2, heating and melting polyvinyl chloride;
s3, uniformly mixing titanium dioxide nano fibers loaded with zinc sulfate, antimony trioxide, trichloroethyl phosphate, zinc borate, aluminum hypophosphite, ammonium polyphosphate and pentaerythritol;
s4, adding the uniformly mixed additives into the molten polyvinyl chloride, and uniformly stirring;
and S5, performing ultrasonic treatment for 1h, and performing extrusion molding.
During the preparation of the sheath, S1 and S2 are not sequential and may be performed simultaneously.
Performance test
Determination of limiting oxygen index: the limited oxygen index of the material was measured using a model XYC-75 limited oxygen index tester manufactured by Kingki measuring instruments, Inc., according to ASTM D2683, and the measurement results are shown in Table 2, wherein the dimensions of the sample were 130 mm. times.6 mm. times.3 mm.
And (3) testing the vertical burning grade: the UL-94 vertical burning grade test was carried out on the material using a model CZF-3 vertical burning apparatus from analytical Instrument works of Jiangning county, Nanjing, according to ASTM D3801 standard, with sample dimensions of 130mm × 13mm × 1.6mm, and the test results are shown in Table 2.
And (3) testing impact strength: the impact strength of the material was measured by using a Hebei Chengde tester, XCJ-40 model simply supported beam impact tester, and the unnotched impact strength of the sample simply supported beam was measured according to GB/T1043-93, with the sample size of 120mm 15mm 10mm, and the measurement results are shown in Table 2.
TABLE 1 raw materials Table
| Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 | Comparative example 2 | |
| Polyvinyl chloride | 95 | 95 | 95 | 95 | 95 | 95 |
| Titanium dioxide nanofibers | 6 | 6 | 6 | 6 | 6 | 6 |
| Antimony trioxide | 1 | 1 | 1 | 1 | 2 | 2 |
| Phosphoric acid trichloroethyl ester | 5 | 5 | 5 | 5 | 7 | 3 |
| Zinc borate | 5 | 5 | 5 | / | 4 | 5 |
| Aluminum hypophosphite | 26 | 26 | 26 | 26 | 26 | 26 |
| Ammonium polyphosphate | 12 | 12 | 12 | 12 | 12 | 12 |
| Pentaerythritol | 4 | 4 | 4 | 4 | 4 | 4 |
| Zinc sulfate | 3 | / | 3 | 3 | 3 | 3 |
TABLE 2 Performance test Table
| Limiting oxygen index (LOI/%) | Flammability UL94 rating | Impact Strength/(J.m)-2） | |
| Example 1 | 28.9 | V-0 | 30.7 |
| Example 2 | 28.1 | V-1 | 26.4 |
| Example 3 | 28.4 | V-1 | 30.6 |
| Example 4 | 27.6 | V-2 | / |
| Comparative example 1 | 28.7 | V-1 | / |
| Comparative example 2 | 28.6 | V-1 | / |
Combining examples 1, 2 and 3 and table 2, it can be seen that, compared to example 1, zinc sulfate is not added in example 2, and zinc sulfate is loaded on titanium dioxide nanofibers and then the elution is performed for multiple times in example 3, so that the loading of zinc sulfate on titanium dioxide nanofibers can significantly improve the impact strength of the sample. In addition, comparing example 1 and example 2, it can be seen that the limited oxygen index and the flammability UL94 rating can be effectively improved after adding zinc sulfate into the system. Comparing example 1, example 2 and example 3 again, it can be seen that the flame retardant performance of example 3 is reduced after the free zinc sulfate is eluted, but the flame retardant performance is still better than that of example 2.
It can be seen by combining examples 1 and 4 and table 2 that the flame retardant performance is significantly reduced after removing zinc borate, the flame retardant effect that pure zinc borate can produce in the system is very limited, and it can be seen that zinc borate has different synergistic effects in the system.
When the mass ratio of antimony trioxide, trichloroethyl phosphate and zinc borate is 1: 5: and 5, the flame retardant has the best synergistic flame retardant effect.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but is protected by patent law within the scope of the claims of the present invention.
Claims (9)
1. The flame-retardant cable sheath is characterized by comprising the following raw materials in parts by weight:
90-100 parts of polyvinyl chloride;
4-7 parts of titanium dioxide nano fibers;
1-2 parts of antimony trioxide;
4-6 parts of trichloroethyl phosphate.
2. The flame-retardant cable sheath according to claim 1, wherein the raw materials further comprise, in parts by weight, 4 to 6 parts of zinc borate.
3. The flame-retardant cable sheath according to claim 2, wherein the mass ratio of the antimony trioxide to the trichloroethyl phosphate to the zinc borate is 1: 5: 5.
4. the flame retardant cable jacket according to claim 1, wherein said raw materials further comprise 25-28 parts by weight of aluminum hypophosphite.
5. The flame-retardant cable sheath according to claim 1, wherein the raw materials further comprise 10-14 parts by weight of ammonium polyphosphate.
6. The flame-retardant cable sheath according to claim 5, wherein the raw materials further comprise 3-6 parts by weight of pentaerythritol.
7. The flame-retardant cable sheath according to claim 6, wherein the raw material further comprises 2-3 parts by weight of zinc sulfate.
8. The flame-retardant cable sheath according to claim 7, wherein the zinc sulfate is loaded on the titanium dioxide nanofibers, and the loading method comprises the following steps:
s1, adding the zinc sulfate saturated solution and the titanium dioxide nano-fiber into a reaction kettle, and reacting for 8-10h at the temperature of 240-260 ℃;
and S2, taking out and drying.
9. The method of preparing a flame retardant cable jacket according to any of claims 1 to 8, comprising the steps of:
s1, loading zinc sulfate on the titanium dioxide nano-fiber for later use;
s2, heating and melting polyvinyl chloride;
s3, uniformly mixing titanium dioxide nano fibers loaded with zinc sulfate, antimony trioxide, trichloroethyl phosphate, zinc borate, aluminum hypophosphite, ammonium polyphosphate and pentaerythritol;
s4, adding the uniformly mixed additives into the molten polyvinyl chloride, and uniformly stirring;
s5, ultrasonic treatment is carried out for 1-2h, and extrusion molding is carried out.
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| CN113637270A (en) * | 2021-08-13 | 2021-11-12 | 安徽电缆股份有限公司 | High-performance information transmission communication cable and production process thereof |
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Application publication date: 20200922 |