CN108148239A - A kind of polyethylene sheath material for communication cable - Google Patents

A kind of polyethylene sheath material for communication cable Download PDF

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Publication number
CN108148239A
CN108148239A CN201611107308.1A CN201611107308A CN108148239A CN 108148239 A CN108148239 A CN 108148239A CN 201611107308 A CN201611107308 A CN 201611107308A CN 108148239 A CN108148239 A CN 108148239A
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parts
polyethylene
density polyethylene
sheath material
makrolon
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Inventor
邵晓东
管莉
刘冬
刘继婷
吴学进
陈鹏
相京霞
张永超
陈暴默
顾恩光
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • 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
    • H01B3/441—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 from alkenes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/02—Flame or fire retardant/resistant
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/22—Halogen free composition
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/20—Applications use in electrical or conductive gadgets
    • C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/062—HDPE
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/066—LDPE (radical process)

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The present invention relates to cable material technical fields, disclose a kind of polyethylene sheath material for communication cable, are prepared by the following raw material：Anti-aging agent CPPD, antioxidant 1010, zinc stearate, glass fibre, molybdenum disulfide, boron nitride, silicon carbide, aluminium oxide, bis-pentamethylenethiuram tetrasulfide, magnesium hydroxide, titanate esters crosslinking agent, dioctyl sebacate, polyethylene wax, ethylene vinyl acetate copolymer, makrolon, low density polyethylene (LDPE), high density polyethylene (HDPE).The present invention greatly improves mechanical strength, flame-resistant insulation performance, heat-resisting cold tolerance is good by the modification to polythene material.

Description

A kind of polyethylene sheath material for communication cable
Technical field
The present invention relates to cable material technical fields, and in particular to a kind of high strength and high flame retardant modified poly ethylene cable material Material.
Background technology
Communication cable generally forms cable core by the conducting wire of more mutual insulatings or conductor, and outside has the communication of sealing sheath Circuit.There are a variety of system of laying such as aerial, direct-burried, pipeline and the bottom.It is divided into symmetrical, coaxial and composite cable by structure；By work( Field operation can be divided into and forever for cable（Underground, submarine cable）.Communication cable transmission band is wider, and message capacity is larger, by the external world It interferes small, but is not easy to overhaul, phone, telegram, data and image etc. can be transmitted.
Polyethylene（Polyethylene, abbreviation PE）It is a kind of aggregated thermoplastic resin obtained of ethylene.In industry On, the also copolymer including ethylene Yu a small amount of alpha-olefin.Polyethylene is odorless, nontoxic, feel ceraceous, has excellent lower temperature resistance Energy（Minimum reachable -100 ~ -70 °C of temperature in use）, chemical stability is good, is resistant to the erosion of most of soda acids（Intolerant to oxidation The acid of property）.Insoluble in common solvent under room temperature, water imbibition is small, and electrical insulating property is excellent.Polyethylene chemical stability is preferable, room Dust technology, the hydrochloric acid of dilute sulfuric acid and any concentration, hydrofluoric acid, phosphoric acid, formic acid, acetic acid, ammonium hydroxide, amine, peroxidating are resistant under temperature The solution such as hydrogen, sodium hydroxide, potassium hydroxide.But the not corrosion of powerful oxidation corrosion resistance, such as oleum concentrated nitric acid, chromic acid and sulfuric acid Mixed liquor.Above-mentioned solvent can generate slow corrosion function to polyethylene at room temperature, and at 90-100 DEG C, the concentrated sulfuric acid and dense Nitric acid can rapidly corrode polyethylene, it is made to destroy or decompose.Polyethylene is under the action of air, sunlight and oxygen, it may occur that old Change, change colour, be cracked, becoming fragile or dusting, lose its mechanical property.At a temperature of processing and forming, also it can be made molten because of oxidation Body degree of killing declines, and discoloration occurs, striped occurs.At present, as the polyethylene of cable sheath material, intensity, anti-flammability, resistance to height The performances such as warm resistance to oxidation cannot meet the requirement of society, need further to research and develop.
Invention content
The defects of in order to overcome existing polythene material, the present invention propose a kind of pe sheath for communication cable Material, intensity is high, and good flame resistance, high temperature insulation is strong, good combination property, and service life is long.
The present invention is achieved by the following technical solution：
A kind of polyethylene sheath material for communication cable is prepared by the following raw material：Anti-aging agent CPPD, antioxidant 1010, zinc stearate, glass fibre, molybdenum disulfide, boron nitride, silicon carbide, aluminium oxide, bis-pentamethylenethiuram tetrasulfide, Magnesium hydroxide, titanate esters crosslinking agent, dioctyl sebacate, polyethylene wax, ethylene-vinyl acetate copolymer, makrolon, Low density polyethylene (LDPE), high density polyethylene (HDPE).
Specifically, it is prepared by the raw material of following parts by weight：
0.2-0.3 parts of anti-aging agent CPPD, 0.3-0.5 part antioxidant 1010s, 1-2 parts of zinc stearates, 1-2 parts of glass fibers Dimension, 2-3 parts of molybdenum disulfide, 2-3 parts of boron nitride, 2-3 parts of silicon carbide, 2-3 parts of aluminium oxide, 3-5 parts of five methylenes of tetra-sulfurized pair Base thiuram, 3-5 parts of magnesium hydroxides, 3-5 parts of titanate esters crosslinking agents, 5-7 parts of dioctyl sebacates, 6-9 parts of polyethylene waxes, 15-22 parts of ethylene-vinyl acetate copolymers, 20-30 parts of makrolon, 40-60 parts of low density polyethylene (LDPE)s, 50-70 parts High density polyethylene (HDPE)；
Preparation method comprises the following steps that:
Take dioctyl sebacate, polyethylene wax, ethylene-vinyl acetate copolymer, makrolon, low density polyethylene (LDPE) and height Density polyethylene is uniformly mixed and obtains mixture, mixture is placed in single screw extrusion machine and is blended, and granulation obtains basic tree Fat carries out mixing, mixing time 3min subsequently into mixer, and mixing temperature is 70 DEG C, prepares major ingredient；
By zinc stearate, glass fibre, molybdenum disulfide, boron nitride, silicon carbide, aluminium oxide, bis-pentamethylenethiuram tetrasulfide, Magnesium hydroxide and titanate esters crosslinking agent are added to 1500rpm in high-speed mixer and 3min are mixed successively, add anti-old Agent CPPD and antioxidant, 500rpm stirring 3min, discharging then with major ingredient mixing, are put into double-screw extruding pelletizing machine and are squeezed Go out to be granulated, obtain masterbatch；Masterbatch is thrown into molding machine be molded, sizing, traction, after cutting to get.
The advantageous effect that the present invention obtains mainly includes the following aspects：
The present invention greatly improves mechanical strength, flame-resistant insulation performance, heat-resisting cold tolerance by the modification to polythene material It is good.Polyethylene has high tensile strength, fabulous flexibility, chemical resistance；Makrolon water white transparency, heat-resisting, shock resistance, It is BI grades fire-retardant, there is good mechanical performance in commonly used temperature；Ethylene-vinyl acetate stable chemical performance, resistance to spoke It penetrates, the characteristics of anti-aging property is outstanding, and inorganic matter compatibility is good, blending resulting materials performance is stablized；Boron nitride, silicon carbide And aluminium oxide can significantly improve the corrosion resistance and mechanical strength of plastic material；Glass fibre can improve toughness and resistance to Corrosive nature；Suitable magnesium hydroxide is added in raw material cooperation, it is cheap, cost can be not only reduced, and outside product sheath Layer can be applicable to the occasion more harsh to flame-retardancy requirements, and flame retardant effect is extremely excellent, and halogen-free environmental；Use tetra-sulfurized pair five For methylene thiuram as accelerating agent, cooperation peroxide vulcanizing system so that the tensile strength of CABLE MATERIALS is high, compresses permanent become Shape is small, and comprehensive performance is good, and vulcanization time is short and abundant, and product sheath has good wear-resisting, solvent resistant and corrosion resistance Energy；Appropriate anti-aging agent and antioxidant can improve the anti-oxidant anti-light according to weather resistance of polythene material.
Specific embodiment
In order to make those skilled in the art better understand the technical solutions in the application, have below in conjunction with the application Body embodiment more clearly and completely describes the present invention, it is clear that described embodiment is only the application one Divide embodiment, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making All other embodiments obtained under the premise of creative work should all belong to the scope of protection of the invention.
Embodiment 1
A kind of polyethylene sheath material for communication cable is prepared by the raw material of following parts by weight：
0.2 part of anti-aging agent CPPD, 0.3 part of antioxidant 1010,1 part of zinc stearate, 1 part of glass fibre, 2 parts of curing Molybdenum, 2 parts of boron nitride, 2 parts of silicon carbide, 2 parts of aluminium oxide, 3 parts of bis-pentamethylenethiuram tetrasulfides, 3 parts of magnesium hydroxides, 3 Part titanate esters crosslinking agent, 5 parts of dioctyl sebacates, 6 parts of polyethylene waxes, 15 parts of ethylene-vinyl acetate copolymers, 20 parts Makrolon, 40 parts of low density polyethylene (LDPE)s, 50 parts of high density polyethylene (HDPE)s；
Preparation method comprises the following steps that:
Take dioctyl sebacate, polyethylene wax, ethylene-vinyl acetate copolymer, makrolon, low density polyethylene (LDPE) and height Density polyethylene is uniformly mixed and obtains mixture, mixture is placed in single screw extrusion machine and is blended, and granulation obtains basic tree Fat carries out mixing, mixing time 3min subsequently into mixer, and mixing temperature is 70 DEG C, prepares major ingredient；
By zinc stearate, glass fibre, molybdenum disulfide, boron nitride, silicon carbide, aluminium oxide, bis-pentamethylenethiuram tetrasulfide, Magnesium hydroxide and titanate esters crosslinking agent are added to 1500rpm in high-speed mixer and 3min are mixed successively, add anti-old Agent CPPD and antioxidant, 500rpm stirring 3min, discharging then with major ingredient mixing, are put into double-screw extruding pelletizing machine and are squeezed Go out to be granulated, obtain masterbatch；Masterbatch is thrown into molding machine be molded, sizing, traction, after cutting to get.
Embodiment 2
A kind of polyethylene sheath material for communication cable is prepared by the raw material of following parts by weight：
0.3 part of anti-aging agent CPPD, 0.5 part of antioxidant 1010,2 parts of zinc stearates, 2 parts of glass fibres, 3 parts of curing Molybdenum, 3 parts of boron nitride, 3 parts of silicon carbide, 3 parts of aluminium oxide, 5 parts of bis-pentamethylenethiuram tetrasulfides, 5 parts of magnesium hydroxides, 5 Part titanate esters crosslinking agent, 7 parts of dioctyl sebacates, 9 parts of polyethylene waxes, 22 parts of ethylene-vinyl acetate copolymers, 30 parts Makrolon, 60 parts of low density polyethylene (LDPE)s, 70 parts of high density polyethylene (HDPE)s；
Preparation method comprises the following steps that:
Take dioctyl sebacate, polyethylene wax, ethylene-vinyl acetate copolymer, makrolon, low density polyethylene (LDPE) and height Density polyethylene is uniformly mixed and obtains mixture, mixture is placed in single screw extrusion machine and is blended, and granulation obtains basic tree Fat carries out mixing, mixing time 3min subsequently into mixer, and mixing temperature is 70 DEG C, prepares major ingredient；
By zinc stearate, glass fibre, molybdenum disulfide, boron nitride, silicon carbide, aluminium oxide, bis-pentamethylenethiuram tetrasulfide, Magnesium hydroxide and titanate esters crosslinking agent are added to 1500rpm in high-speed mixer and 3min are mixed successively, add anti-old Agent CPPD and antioxidant, 500rpm stirring 3min, discharging then with major ingredient mixing, are put into double-screw extruding pelletizing machine and are squeezed Go out to be granulated, obtain masterbatch；Masterbatch is thrown into molding machine be molded, sizing, traction, after cutting to get.
Embodiment 3
Performance detection experiment, each performance value such as table 1 are carried out to the protective cover material of embodiment 1-2：
Table 1
Pilot project Embodiment 1 Embodiment 2
Tensile strength Mpa 22.1 23.5
Elongation at break % 253 243
90 DEG C of volume resistivities（Ω.m） 1.4×1013 1.7×1013
VW-1 burns Pass through Pass through
Oxygen index (OI) 35.7 36.4
Caloric deformation rate % (150 DEG C × 2000g × 1h) 7.5% 8.3%
（- 20 degree）Low temperature brittleness failure number 5 5
Conclusion：The present invention greatly improves mechanical strength, flame-resistant insulation performance by the modification to polythene material, heat-resisting resistance to Cold energy is good.
Finally, it should also be noted that it is listed above be only the present invention several specific embodiments.Obviously, this hair Bright to be not limited to above example, acceptable there are many deform.Those of ordinary skill in the art can be from present disclosure All deformations for directly exporting or associating, are considered as protection scope of the present invention.

Claims (3)

1. a kind of polyethylene sheath material for communication cable is prepared by the following raw material：Anti-aging agent CPPD, antioxidant 1010, zinc stearate, glass fibre, molybdenum disulfide, boron nitride, silicon carbide, aluminium oxide, bis-pentamethylenethiuram tetrasulfide, Magnesium hydroxide, titanate esters crosslinking agent, dioctyl sebacate, polyethylene wax, ethylene-vinyl acetate copolymer, makrolon, Low density polyethylene (LDPE), high density polyethylene (HDPE).
2. polyethylene sheath material according to claim 1, which is characterized in that the polyethylene sheath material is by following parts by weight Raw material be prepared：
0.2-0.3 parts of anti-aging agent CPPD, 0.3-0.5 part antioxidant 1010s, 1-2 parts of zinc stearates, 1-2 parts of glass fibers Dimension, 2-3 parts of molybdenum disulfide, 2-3 parts of boron nitride, 2-3 parts of silicon carbide, 2-3 parts of aluminium oxide, 3-5 parts of five methylenes of tetra-sulfurized pair Base thiuram, 3-5 parts of magnesium hydroxides, 3-5 parts of titanate esters crosslinking agents, 5-7 parts of dioctyl sebacates, 6-9 parts of polyethylene waxes, 15-22 parts of ethylene-vinyl acetate copolymers, 20-30 parts of makrolon, 40-60 parts of low density polyethylene (LDPE)s, 50-70 parts High density polyethylene (HDPE)；
3. according to the polyethylene sheath material described in claim 1-2, which is characterized in that the preparation method of the polyethylene sheath material Include the following steps:
1）Take dioctyl sebacate, polyethylene wax, ethylene-vinyl acetate copolymer, makrolon, low density polyethylene (LDPE) and High density polyethylene (HDPE) is uniformly mixed and obtains mixture, mixture is placed in single screw extrusion machine and is blended, and granulation obtains basic tree Fat carries out mixing, mixing time 3min subsequently into mixer, and mixing temperature is 70 DEG C, prepares major ingredient；
2）By zinc stearate, glass fibre, molybdenum disulfide, boron nitride, silicon carbide, aluminium oxide, tetra-sulfurized pair pentamethylene autumn orchid Nurse, magnesium hydroxide and titanate esters crosslinking agent are added to 1500rpm in high-speed mixer and 3min are mixed, add successively Anti-aging agent CPPD and antioxidant, 500rpm stirring 3min, discharging then with major ingredient mixing, put into double-screw extruding pelletizing Machine extruding pelletization, obtains masterbatch；Masterbatch is thrown into molding machine be molded, sizing, traction, after cutting to get.
CN201611107308.1A 2016-12-06 2016-12-06 A kind of polyethylene sheath material for communication cable Pending CN108148239A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110176329A (en) * 2019-06-13 2019-08-27 花振强 A kind of flame retardant cable
CN116376181A (en) * 2023-04-11 2023-07-04 江苏馨德高分子材料股份有限公司 Low-smoke halogen-free flame retardant for anti-leakage coaxial cable
CN117801408A (en) * 2023-12-29 2024-04-02 浙江富春江光电科技有限公司 Wear-resistant and tear-resistant optical cable material and preparation method thereof
CN118307867A (en) * 2024-06-11 2024-07-09 河北品华管业有限公司 Polyurethane direct-buried heat-insulating pipe

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103509232A (en) * 2013-08-30 2014-01-15 安徽天民电气科技有限公司 Black weather-stress-cracking-resistant polyethylene cable sheath material and preparation method thereof
CN103571008A (en) * 2013-09-30 2014-02-12 芜湖航天特种电缆厂 Low-smoke halogen-free flame-retardant polyolefin cable material
CN105623052A (en) * 2016-04-05 2016-06-01 江苏亨通高压电缆有限公司 High-strength wear-resistant submarine cable outer sheath material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103509232A (en) * 2013-08-30 2014-01-15 安徽天民电气科技有限公司 Black weather-stress-cracking-resistant polyethylene cable sheath material and preparation method thereof
CN103571008A (en) * 2013-09-30 2014-02-12 芜湖航天特种电缆厂 Low-smoke halogen-free flame-retardant polyolefin cable material
CN105623052A (en) * 2016-04-05 2016-06-01 江苏亨通高压电缆有限公司 High-strength wear-resistant submarine cable outer sheath material

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110176329A (en) * 2019-06-13 2019-08-27 花振强 A kind of flame retardant cable
CN116376181A (en) * 2023-04-11 2023-07-04 江苏馨德高分子材料股份有限公司 Low-smoke halogen-free flame retardant for anti-leakage coaxial cable
CN117801408A (en) * 2023-12-29 2024-04-02 浙江富春江光电科技有限公司 Wear-resistant and tear-resistant optical cable material and preparation method thereof
CN118307867A (en) * 2024-06-11 2024-07-09 河北品华管业有限公司 Polyurethane direct-buried heat-insulating pipe
CN118307867B (en) * 2024-06-11 2024-08-16 河北品华管业有限公司 Polyurethane direct-buried heat-insulating pipe

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Application publication date: 20180612