CN102977451A - Low smoke zero halogen flame retardant sheath layer for optical cable - Google Patents
Low smoke zero halogen flame retardant sheath layer for optical cable Download PDFInfo
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Abstract
The invention discloses a low smoke zero halogen flame retardant sheath layer for an optical cable, wherein the optical cable comprises an optical cable core and a low smoke zero halogen flame retardant sheath layer covering the outer surface of the optical cable, and the low smoke zero halogen flame retardant sheath layer is composed of the following components in parts by weight: 65-75 parts of ethylene-vinyl acetate copolymer, 20-30 parts of high-pressure metallocene polyethylene, 10-20 parts of special modified polyethylene, 70-110 parts of aluminium hydroxide, 20-30 parts of magnesium hydroxide, 2-5 parts of silicone master batch, 1-3 parts of polyethylene wax, 30-50 parts of flowable agent, 0.15-0.45 parts of antioxidant and 2-5 parts of black master batch. The low smoke zero halogen flame retardant sheath layer for the optical cable enables the outer diameter of the optical cable to be even, thereby guaranteeing the shrinkage integrity of the optical cable core; as a result, signals can not be greatly attenuated in the transmission process in the cable; and simultaneously, the tensile strength of the cable is greater than or equal to 13 MPa, while the elongation at break is greater than or equal to 250% and the oxygen index is greater than or equal to 34%; and the cable has excellent mechanical properties.
Description
Technical field
The present invention relates to a kind of flame retardant sheath layer, relate in particular to a kind of low-smoke halogen-free flame-retardant sheath layer for optical cable.
Background technology
Along with the enhancing of people to environmental protection and awareness of safety, requirement to cable jacket material is more and more higher, excellent physical and mechanical properties not only will be arranged, but also higher flame retardant properties to be arranged, show according to the pertinent literature statistic data, most people burn to death in fire, but because suffocating of causing of a large amount of cigarette, toxic gases loses the chance of escape, finally lose one's life.Therefore, low smoke halogen-free fire retardant polyolefin cable material is replacing traditional PVC cable jacket material gradually as a kind of product of environmental protection.Since " the Chinese FTTH first year " in 2008, the Domestic Carriers such as China Telecom are carried forward vigorously " light entering and copper back ", this has brought wide market for the interior optical cable in multicore chamber (office), has brought wide market also for the low-smoke halogen-free flame-retardant sheath material of the required antiblocking of the interior optical cable in multicore chamber (office).
According to disclosed Chinese patent CN 1445793A[low smoke halogen-free fire retardant polyolefin cable material and preparation method thereof] and a CN 1796450A[low smoke halogen-free fire retardant polyolefin cable material and preparation method thereof] show that the body material that preparation halogen-free anti-flaming polyolefin cable adopts is ethylene-vinyl acetate (EVA) and high density polyethylene(HDPE) (HDPE), add a large amount of inorganic hydrogen aluminum oxide, flame retardant of magnesium hydroxide, add in addition the auxiliary agents such as polyethylene wax, oxidation inhibitor, colour batch.There is following some deficiency in this type of formula system: one, add a large amount of high density polyethylene(HDPE)s so that the processing temperature of product (150 ℃ ~ 160 ℃) is higher, be easy to the subelement adhesion of core, can not satisfy the requirement of the interior cable jacket in multicore chamber (office); Two, product is extruded stablely not in the course of processing, causes the external diameter fluctuation of optical cable larger.
Summary of the invention
The purpose of this invention is to provide a kind of low-smoke halogen-free flame-retardant sheath layer for optical cable, it has solved the technical problem that stranding adds man-hour and the adhesion of cable line cartridge units, improved the processing characteristics of product, so that cable outer diameter is even, thereby guaranteed the contraction integrity of Cable Core, signal significant decay can not occur in the transmission course therein; Simultaneously, cable tensile strain intensity 〉=13MPa, elongation at break 〉=250%, oxygen index 〉=34% has excellent mechanical property.
For achieving the above object, the technical solution used in the present invention is: a kind of low-smoke halogen-free flame-retardant sheath layer for optical cable, described optical cable comprises Cable Core and is coated on the low-smoke halogen-free flame-retardant sheath layer of Cable Core outside surface that described low-smoke halogen-free flame-retardant sheath layer is obtained by the component processing of following weight part:
65 ~ 75 parts of ethylene-vinyl acetate copolymers,
20 ~ 30 parts of high pressure metallocene PEs,
10 ~ 20 parts of modified poly ethylenes,
70 ~ 110 parts in aluminium hydroxide,
10 ~ 30 parts of magnesium hydroxides,
2 ~ 5 parts of silicone masterbatch,
1 ~ 3 part of polyethylene wax,
20 ~ 40 parts of flowing agents,
0.15 ~ 0.45 part in oxidation inhibitor,
2 ~ 5 parts of black masterbatch;
The VA content of described ethylene-vinyl acetate copolymer is 20 ~ 28%;
Described high pressure metallocene PE is melting index≤3g/10min under 190 ℃, 2.16Kg, and density is less than 0.92g/cm3.
Further improved technical scheme is as follows in the technique scheme:
1. in the such scheme, the ratio whiteness of described aluminium hydroxide, magnesium hydroxide 〉=95% is preferably 98%, and its particle diameter is 1 ~ 1.5 μ m.
2. in the such scheme, described polyethylene wax softening temperature 〉=90 ℃, masterbatch content of carbon black 45% ~ 50%.
3. in the such scheme, the maleic anhydride grafting ratio of described modified poly ethylene selects 0.5 ~ 1.
Because the utilization of technique scheme, the present invention compared with prior art has following advantages:
1. the present invention is used for the low-smoke halogen-free flame-retardant sheath layer of optical cable, solve product produce and use procedure in the core adhesion with extrude the unstable technical problem that causes cable outer diameter to fluctuate, the low smoke halogen-free fire retardant polyolefin cable material of producing at present adopts ethylene-vinyl acetate, high density polyethylene(HDPE), aluminium hydroxide, the inorganic combustion inhibitors such as magnesium hydroxide, the lubricants such as polyethylene wax, oxidation inhibitor, the auxiliary agents such as colour batch, and the present invention adopts ethylene-vinyl acetate, special modified polyethylene, high pressure metallocene PE (EPPE) is as body material, aluminium hydroxide in this body material, magnesium hydroxide is fire retardant, adds the silicone masterbatch again, polyethylene wax, flowing agent, oxidation inhibitor, the auxiliary agents such as colour batch; The special modified polyethylene that the present invention adds is except as the matrix, the effect that also has coupling agent, can make inorganic combustion inhibitor and organic resin have preferably consistency, thereby can improve the physical and mechanical properties of product, cable tensile strain intensity 〉=13MPa, elongation at break 〉=250%, oxygen index 〉=34%; And the silicone masterbatch that adds and specific composite matrix synergy can further increase scrape resistant and wear resisting property lastingly, improve surface gloss, improve flowability, reduction moment of torsion, the filling ability of plastic working; Improve resin demoulding in the mold base of high temperature complexity, non-slip in screw rod, be conducive to extrude processing.
2. the present invention is used for the low-smoke halogen-free flame-retardant sheath layer of optical cable, abandoned the processing temperature (135 ℃ ~ 145 ℃) that high density polyethylene(HDPE) of the prior art has reduced product, select the various ingredients of certain content as base material, melt strength when having improved high temperature, the melt fracture problem that improvement occurs because consistency is poor, and then the slickness of jacket surface is extruded in improvement, high pressure metallocene PE EPPE is that a kind of density is less than 0.92g/cm3, melting index is less than the polyethylene of 3g/10min, it is so that product of the present invention has good processing characteristics, resistance when reducing screw rod shearing, reduced the electric current of screw rod, so that product plastic emitting when high temperature is extruded is stable, flowing agent adds so that product has certain flame retardant resistance, alternative fire retardant such as aluminium hydroxide, have simultaneously certain lubricant effect, can reduce the flowability of product when extruding, improve the product processing characteristics.
3. the present invention is used for the low-smoke halogen-free flame-retardant sheath layer of optical cable, thereby add simultaneously the technical problem that the antiblocking flowing agent has solved sheath and the adhesion of core subelement, by the processing characteristics of product of having added the Effective Raises such as silicone masterbatch, polyethylene wax, flowing agent, so that extrude the stable prod smooth surface, external diameter is even.Also have certain cooperative flame retardant effect with aluminium hydroxide, magnesium hydroxide by adding silicone masterbatch and flowing agent, improved the flame retardant properties of product; Secondly, this product material therefor does not all contain halogen, so the amount of being fuming is less during the environmental protection burning.
Description of drawings
Accompanying drawing 1 is used for the low-smoke halogen-free flame-retardant sheath layer structural representation of optical cable for the present invention.
In the above accompanying drawing: 1, Cable Core; 2, low-smoke halogen-free flame-retardant sheath layer.
Embodiment
The invention will be further described below in conjunction with drawings and Examples:
Embodiment 1: a kind of low-smoke halogen-free flame-retardant sheath layer for optical cable, described optical cable comprise Cable Core 1 and are coated on the low-smoke halogen-free flame-retardant sheath layer 2 of Cable Core 1 outside surface that described low-smoke halogen-free flame-retardant sheath layer 2 is obtained by the component processing of following weight part:
69 parts of ethylene-vinyl acetate copolymers,
21 parts of high pressure metallocene PEs,
10 parts of modified poly ethylenes,
105 parts in aluminium hydroxide,
10 parts of magnesium hydroxides,
4.5 parts of silicone masterbatch,
1.8 parts of polyethylene waxs,
Flowing agent20 parts,
0.45 part in oxidation inhibitor,
3 parts of black masterbatch;
Above-mentioned flowing agent is that Haimen Xinlong Xiang special plastic company limited produces.
The VA content of described ethylene-vinyl acetate copolymer (EVA) is 20 ~ 28%;
Described high pressure metallocene PE (EPPE) is melting index≤3g/10min under 190 ℃, 2.16Kg, and density is less than 0.92g/cm3.
The ratio whiteness of above-mentioned aluminium hydroxide, magnesium hydroxide 〉=95% is preferably 98%, and its particle diameter is 1 ~ 1.5 μ m.
Above-mentioned polyethylene wax softening temperature 〉=90 ℃, masterbatch content of carbon black 45% ~ 50%.
The maleic anhydride grafting ratio of above-mentioned modified poly ethylene selects 0.5 ~ 1.
The low-smoke halogen-free flame-retardant sheath layer preparation process that is used for optical cable is as follows: according to the weight of each component of recipe ingredient accurate weighing of product, be accurate to ± 1%, with weighing accurately starting material join carry out in the plastic cement kneader (Banbury mixer) mixing, time is about 12 ~ 15min, temperature is 150 ~ 160 ℃, so that each component mixes fully plasticizing.Again it is extruded the unit extruding pelletization through two rank, air-cooled fervent mode is adopted in granulation, packs after then the process transport pipe is delivered to cyclonic separator, finished product bin.
Embodiment 2: a kind of low-smoke halogen-free flame-retardant sheath layer for optical cable, described optical cable comprise Cable Core 1 and are coated on the low-smoke halogen-free flame-retardant sheath layer 2 of Cable Core 1 outside surface that described low-smoke halogen-free flame-retardant sheath layer 2 is obtained by the component processing of following weight part:
69 parts of ethylene-vinyl acetate copolymers,
21 parts of high pressure metallocene PEs,
15 parts of modified poly ethylenes,
75 parts in aluminium hydroxide,
30 parts of magnesium hydroxides,
4.5 parts of silicone masterbatch,
1.8 parts of polyethylene waxs,
30 parts of flowing agents,
0.45 part in oxidation inhibitor,
4 parts of black masterbatch;
The VA content of described ethylene-vinyl acetate copolymer (EVA) is 20 ~ 28%;
Described high pressure metallocene PE (EPPE) is melting index≤3g/10min under 190 ℃, 2.16Kg, and density is less than 0.92g/cm3.
Above-mentioned flowing agent is that Haimen Xinlong Xiang special plastic company limited produces.
The ratio whiteness of above-mentioned aluminium hydroxide, magnesium hydroxide 〉=95% is preferably 98%, and its particle diameter is 1 ~ 1.5 μ m.
Above-mentioned polyethylene wax softening temperature 〉=90 ℃, masterbatch content of carbon black 45% ~ 50%.
The maleic anhydride grafting ratio of above-mentioned modified poly ethylene selects 0.5 ~ 1.
Present embodiment is used for the low-smoke halogen-free flame-retardant sheath layer preparation process of optical cable with embodiment 1.
Performance test results:
To sum up, the present invention is used for the low-smoke halogen-free flame-retardant sheath layer of optical cable, solve product produce and use procedure in the core adhesion with extrude the unstable technical problem that causes cable outer diameter to fluctuate, the low smoke halogen-free fire retardant polyolefin cable material of producing at present adopts ethylene-vinyl acetate, high density polyethylene(HDPE), aluminium hydroxide, the inorganic combustion inhibitors such as magnesium hydroxide, the lubricants such as polyethylene wax, oxidation inhibitor, the auxiliary agents such as colour batch, and the present invention adopts ethylene-vinyl acetate, special modified polyethylene, high pressure metallocene PE (EPPE) is as body material, aluminium hydroxide in this body material, magnesium hydroxide is fire retardant, adds the silicone masterbatch again, polyethylene wax, flowing agent, oxidation inhibitor, the auxiliary agents such as colour batch; The special modified polyethylene that the present invention adds is except as the matrix, the effect that also has coupling agent, can make inorganic combustion inhibitor and organic resin have preferably consistency, thereby can improve the physical and mechanical properties of product, cable tensile strain intensity 〉=13MPa, elongation at break 〉=250%, oxygen index 〉=34%.Secondly, the present invention is used for the low-smoke halogen-free flame-retardant sheath layer of optical cable, abandoned the processing temperature (135 ℃ ~ 145 ℃) that high density polyethylene(HDPE) of the prior art has reduced product, select the various ingredients of certain content as base material, melt strength when having improved high temperature, the melt fracture problem that improvement occurs because consistency is poor, and then the slickness of jacket surface is extruded in improvement, high pressure metallocene PE EPPE is that a kind of density is less than 0.92g/cm3, melting index is less than the polyethylene of 3g/10min, it is so that product of the present invention has good processing characteristics, resistance when reducing screw rod shearing has reduced the electric current of screw rod, so that product plastic emitting when high temperature is extruded is stable.Again, the present invention is used for the low-smoke halogen-free flame-retardant sheath layer of optical cable, thereby add simultaneously the technical problem that the antiblocking flowing agent has solved sheath and the adhesion of core subelement, by the processing characteristics of product of having added the Effective Raises such as silicone masterbatch, polyethylene wax, flowing agent, so that extrude the stable prod smooth surface, external diameter is even.Also have certain cooperative flame retardant effect with aluminium hydroxide, magnesium hydroxide by adding silicone masterbatch and flowing agent, improved the flame retardant properties of product; Secondly, this product material therefor does not all contain halogen, so the amount of being fuming is less during the environmental protection burning.
Above-described embodiment only is explanation technical conceive of the present invention and characteristics, and its purpose is to allow the personage who is familiar with technique can understand content of the present invention and according to this enforcement, can not limit protection scope of the present invention with this.All equivalences that spirit is done according to the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (4)
1. low-smoke halogen-free flame-retardant sheath layer that is used for optical cable, it is characterized in that: described optical cable comprises Cable Core (1) and is coated on the low-smoke halogen-free flame-retardant sheath layer (2) of Cable Core (1) outside surface that described low-smoke halogen-free flame-retardant sheath layer (2) is obtained by the component processing of following weight part:
65 ~ 75 parts of ethylene-vinyl acetate copolymers,
20 ~ 30 parts of high pressure metallocene PEs,
10 ~ 20 parts of modified poly ethylenes,
70 ~ 110 parts in aluminium hydroxide,
10 ~ 30 parts of magnesium hydroxides,
2 ~ 5 parts of silicone masterbatch,
1 ~ 3 part of polyethylene wax,
20 ~ 40 parts of flowing agents,
0.15 ~ 0.45 part in oxidation inhibitor,
2 ~ 5 parts of black masterbatch;
The VA content of described ethylene-vinyl acetate copolymer (EVA) is 20 ~ 28%;
Described high pressure metallocene PE (EPPE) is melting index≤3g/10min under 190 ℃, 2.16Kg, and density is less than 0.92g/cm3.
2. low-smoke halogen-free flame-retardant sheath layer according to claim 1 is characterized in that: the maleic anhydride grafting ratio selection 0.5 ~ 1 of described modified poly ethylene.
3. low-smoke halogen-free flame-retardant sheath layer according to claim 1 is characterized in that: the ratio whiteness of described aluminium hydroxide, magnesium hydroxide 〉=95%, be preferably 98%, and its particle diameter is 1 ~ 1.5 μ m.
4. low-smoke halogen-free flame-retardant sheath layer according to claim 1 is characterized in that: described polyethylene wax softening temperature 〉=90 ℃, masterbatch content of carbon black 45% ~ 50%.
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| CN201210513606.6A CN102977451B (en) | 2012-12-04 | 2012-12-04 | For the low-smoke halogen-free flame-retardant sheath layer of optical cable |
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| CN201210513606.6A CN102977451B (en) | 2012-12-04 | 2012-12-04 | For the low-smoke halogen-free flame-retardant sheath layer of optical cable |
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| CN102977451B CN102977451B (en) | 2016-03-30 |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103881225A (en) * | 2014-03-07 | 2014-06-25 | 安徽中通电缆科技有限公司 | Formula for wear-resistant low-smoke zero-halogen electro-insulating rubber |
| CN103881224A (en) * | 2014-03-07 | 2014-06-25 | 安徽中通电缆科技有限公司 | Formula of environment-friendly low-smoke halogen-free cable sheath |
| CN103897255A (en) * | 2014-03-07 | 2014-07-02 | 安徽中通电缆科技有限公司 | Formula of long-life low-smoke halogen-free insulating material |
| CN103897253A (en) * | 2014-03-07 | 2014-07-02 | 安徽中通电缆科技有限公司 | Formula of environment-friendly and halogen-free insulating rubber |
| CN103897254A (en) * | 2014-03-07 | 2014-07-02 | 安徽中通电缆科技有限公司 | Formula of low smoke zero halogen cable sheathing compound |
| CN104693583A (en) * | 2015-04-03 | 2015-06-10 | 中广核三角洲（苏州）高聚物有限公司 | Thermoplastic high-strength low-smoke halogen-free flame-retardant cable material for rail transit |
| CN105694518A (en) * | 2016-03-18 | 2016-06-22 | 建湖东方电缆材料有限公司 | Hot material type halogen-free low-smoke flame-retardant sheath material |
| CN106543515A (en) * | 2015-09-22 | 2017-03-29 | 上海凯波特种电缆料厂有限公司 | A kind of insulating material of polyethylene suitable for high speed extrusion and preparation method thereof |
| CN111180122A (en) * | 2018-11-13 | 2020-05-19 | 日立金属株式会社 | Cable with a protective layer |
| CN111732783A (en) * | 2020-07-08 | 2020-10-02 | 上海叶心材料科技有限公司 | Metallocene linear low density polyethylene reinforced wire and cable sheath |
| CN112002479A (en) * | 2020-08-21 | 2020-11-27 | 安徽新特华宇电缆有限公司 | High-low temperature resistant explosion-proof power cable for ships |
| CN114316416A (en) * | 2019-06-20 | 2022-04-12 | 广西纵览线缆集团有限公司 | Low-smoke halogen-free flame-retardant low-voltage cable |
| CN114974721A (en) * | 2022-08-02 | 2022-08-30 | 广州南洋电缆集团有限公司 | Low-heat-release photoelectric composite wire and cable for nuclear power station and manufacturing method thereof |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103881224A (en) * | 2014-03-07 | 2014-06-25 | 安徽中通电缆科技有限公司 | Formula of environment-friendly low-smoke halogen-free cable sheath |
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| CN104693583A (en) * | 2015-04-03 | 2015-06-10 | 中广核三角洲（苏州）高聚物有限公司 | Thermoplastic high-strength low-smoke halogen-free flame-retardant cable material for rail transit |
| CN106543515B (en) * | 2015-09-22 | 2020-08-18 | 上海凯波特种电缆料厂有限公司 | Polyethylene insulating material suitable for high-speed extrusion and preparation method thereof |
| CN106543515A (en) * | 2015-09-22 | 2017-03-29 | 上海凯波特种电缆料厂有限公司 | A kind of insulating material of polyethylene suitable for high speed extrusion and preparation method thereof |
| CN105694518A (en) * | 2016-03-18 | 2016-06-22 | 建湖东方电缆材料有限公司 | Hot material type halogen-free low-smoke flame-retardant sheath material |
| CN111180122A (en) * | 2018-11-13 | 2020-05-19 | 日立金属株式会社 | Cable with a protective layer |
| CN111180122B (en) * | 2018-11-13 | 2023-01-03 | 日立金属株式会社 | Cable with a protective layer |
| CN114316416A (en) * | 2019-06-20 | 2022-04-12 | 广西纵览线缆集团有限公司 | Low-smoke halogen-free flame-retardant low-voltage cable |
| CN114316416B (en) * | 2019-06-20 | 2023-03-21 | 广西纵览线缆集团有限公司 | Low-smoke halogen-free flame-retardant low-voltage cable |
| CN111732783A (en) * | 2020-07-08 | 2020-10-02 | 上海叶心材料科技有限公司 | Metallocene linear low density polyethylene reinforced wire and cable sheath |
| CN112002479A (en) * | 2020-08-21 | 2020-11-27 | 安徽新特华宇电缆有限公司 | High-low temperature resistant explosion-proof power cable for ships |
| CN112002479B (en) * | 2020-08-21 | 2021-09-28 | 安徽新特华宇电缆有限公司 | High-low temperature resistant explosion-proof power cable for ships |
| CN114974721A (en) * | 2022-08-02 | 2022-08-30 | 广州南洋电缆集团有限公司 | Low-heat-release photoelectric composite wire and cable for nuclear power station and manufacturing method thereof |
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