CN107936394A - A kind of wear-resisting modified polystyrene cable - Google Patents

A kind of wear-resisting modified polystyrene cable Download PDF

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Publication number
CN107936394A
CN107936394A CN201711050522.2A CN201711050522A CN107936394A CN 107936394 A CN107936394 A CN 107936394A CN 201711050522 A CN201711050522 A CN 201711050522A CN 107936394 A CN107936394 A CN 107936394A
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polystyrene
parts
cable
modified polystyrene
polymerization
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CN201711050522.2A
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Chinese (zh)
Inventor
舒春柳
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Sichuan Lizhi Jiuchuang Intellectual Property Operations Ltd
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Sichuan Lizhi Jiuchuang Intellectual Property Operations Ltd
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Priority to CN201711050522.2A priority Critical patent/CN107936394A/en
Publication of CN107936394A publication Critical patent/CN107936394A/en
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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
    • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
    • C08L25/02—Homopolymers or copolymers of hydrocarbons
    • C08L25/04—Homopolymers or copolymers of styrene
    • C08L25/06—Polystyrene
    • 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
    • H01B3/442—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 aromatic vinyl compounds
    • 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
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • 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
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/1875—Multi-layer sheaths
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/002—Physical properties
    • C08K2201/005—Additives being defined by their particle size in general
    • 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

Abstract

The invention discloses a kind of wear-resisting modified polystyrene cable, including：An at least conductor thread core, the insulating layer being paperwrapped in outside the conductor thread core, the shielded layer being paperwrapped in outside the insulating layer, cladding are around in the restrictive coating outside the shielded layer；The restrictive coating includes inner sheath, liner layer, armor and serving；The inner sheath and serving are prepared using modified polystyrene material；The modified polystyrene material is prepared including following parts by weight raw material：8 15 parts of ceramic particle, 10 15 parts of modifying agent, 20 30 parts of polyethylene, 35 55 parts of polystyrene, 0.3 0.8 parts of coupling agent, 0.3 0.5 parts of crosslinking agent；The cable improves the wearability of polystyrene cable, the polystyrene cable is used for a long time in high abrasion environment using modified polystyrene material by modification, with superior abrasion resistance as the serving in the coat layer of power cable.

Description

A kind of wear-resisting modified polystyrene cable
Technical field
The present invention relates to field of cables, and in particular to a kind of wear-resisting modified polystyrene cable.
Background technology
Cable is to be fabricated to conductor thread core by twisted with one or more conducting wire, then corresponding insulation is imposed on conductor Layer, the conducting wire that outside is wrapped sealing sheath and formed, is mainly made of core, insulating layer, shielded layer and restrictive coating.Cable has Take ground and space is few；Power supply safety is reliable, and electric shock possibility is small；Be conducive to improve the power factor of electric system；Operation, Maintenance work is simple and convenient；Be conducive to beautifying city, there is many advantages, such as confidentiality, in being widely used in living and producing Every field.The restrictive coating performance of cable is one of principal element for determining cable use environment, meanwhile, cable uses ring Border also determines the performance requirement of cable cover(ing) layer material.
Polystyrene is the polymer synthesized by styrene monomer through free radical polymerization, because it is with electrical insulating property The advantages that energy is good, and easy coloring, processing fluidity is good, and rigidity is good and chemical resistance is good, is widely used in machinery, automobile, electricity The industrial circles such as sub- electric appliance, instrument and meter, weaving and building, in cable industry, polystyrene also has application.But polystyrene Material wearability itself is poor, and obtained polystyrene cable cannot meet long-time service of the cable in high abrasion environment, because This, in order to improve service life of the polystyrene cable in high abrasion environment, the wearability of polystyrene cable needs to improve And raising.
The content of the invention
The defects of it is an object of the invention to overcome existing polystyrene cable to wear no resistance, there is provided a kind of wear-resisting modification gathers Styrene cable；The present invention has the modified polystyrene material of superior abrasion resistance as cable protection by by modification Serving in jacket layer, improves the wearability of polystyrene cable, the polystyrene cable is grown in high abrasion environment Phase uses.
In order to realize foregoing invention purpose, the present invention provides a kind of wear-resisting modified polystyrene cable, including：At least one Root conductor thread core, the insulating layer being paperwrapped in outside the conductor thread core, the shielded layer being paperwrapped in outside the insulating layer, cladding are around in institute State the restrictive coating outside shielded layer；The restrictive coating includes inner sheath, liner layer, armor and serving；The serving is adopted It is prepared with modified polystyrene material；The modified polystyrene material include following parts by weight raw material prepare and Into：8-15 parts of ceramic particle, 10-15 parts of modifying agent, 20-30 parts of polyethylene, 35-55 parts of polystyrene, 0.3-0.8 The coupling agent, 0.3-0.5 parts of crosslinking agent of part；The mixture that the modifying agent forms for benzoic acid with ethyl orthosilicate；Institute The ethyl orthosilicate degree of polymerization stated is 600-1000；The polystyrene degree of polymerization is 1000-1800；The coupling agent is Vinyl silanes；The crosslinking agent is to three iso-propenyloxysilane of phenyl.
A kind of wear-resisting modified polystyrene cable of the present invention, using the modified polyphenyl second with superior abrasion resistance and processability Alkene material not only make use of in modified polystyrene material since specific aim screens modification as the serving in the coat layer of power cable Agent, coupling agent and crosslinking agent collaboration ceramic particle just assign the more preferable wearability of polystyrene to improve the wearability of cable, Also use in modified polystyrene material by controlling the degree of polymerization of polystyrene to make to have between wearability and processability Optimum balance relation, so as to get polystyrene cable while with superior abrasion resistance, processability is not subject to tight Ghost image sound, a large amount of productions to polystyrene wear-resistant cable have positive effect.
A kind of above-mentioned wear-resisting modified polystyrene cable, wherein, the ceramic particle particle diameter is 0.01-2 μm；Ceramics Grain particle diameter is smaller, and dispersiveness is poorer, the humidification of polystyrene wearability is reduced, ceramic particle particle diameter is bigger, in polyphenyl Compatibility is poorer in ethene phase, interfacial separation easily occurs, influences the wearability of polystyrene material；Preferably, the pottery Porcelain grain diameter is 0.1-1 μm；Most preferably, the ceramic particle particle diameter is 0.3-0.6 μm.
Wherein, it is preferred that the ceramic particle is silicon oxide ceramics, one kind in silicon nitride ceramics, silicon carbide ceramics It is or a variety of；The ceramic particle is more preferable with the compatibility of polystyrene under the action of plurality of raw materials, to the wearability of polystyrene Humidification is optimal.
A kind of above-mentioned wear-resisting modified polystyrene cable, wherein, the modifying agent had both improved ceramic particle and polyphenyl second The compatibility of alkene, moreover it is possible to increase polystyrene material wearability；Preferably, benzoic acid and ethyl orthosilicate in the modifying agent The ratio between the amount of material be 1 ︰ 3.
A kind of above-mentioned wear-resisting modified polystyrene cable, wherein, the degree of polymerization of polystyrene is bigger, and wearability is got over after crosslinking Difference, processability is better, and the polymer of polystyrene is smaller, then wearability is better after being crosslinked, and processability is poorer, and therefore, selection is closed The polystyrene degree of polymerization of reason, is the important means for balancing wearability and processability.Preferably, the ethyl orthosilicate is poly- Right is 750-850；Optimal, the degree of polymerization of the ethyl orthosilicate is 800.Preferably, the polymerization of the polystyrene Spend for 1200-1600；Most preferably, the degree of polymerization of the polystyrene is 1300；Pass through modified polyphenyl second that is preferred, obtaining Alkene material both has excellent wearability, it may have preferable processability, the performance of polystyrene cable are also more preferable.
Wherein, the coupling agent is vinyl silanes；Vinyl silanes can increase ceramic particle and polystyrene material Between compatibility, the performance of modified polystyrene material is improved, so as to improve the performance of polystyrene cable.
Wherein, the crosslinking agent is to three iso-propenyloxysilane of phenyl；The crosslinking agent can not only gather two kinds of differences Right polystyrene is suitably crosslinked, and improves the wearability of modified polystyrene material, can improve with the compatibility of ceramic particle, Increase modifying function of the ceramic particle to polystyrene, synergistic function is formed with ceramic particle.
Wherein, the raw material of modified polystyrene material further include dispersant, plasticizer, antistatic additive, coloring agent, blast One or more in agent；Above-mentioned auxiliary agent can improve the processability of modified polystyrene material, increase the effect such as its feature, So as to improve the performance of polystyrene cable.
Wherein, the preparation method of the modified polystyrene material, comprises the following steps：
（1）Ceramic particle is handled with coupling agent；
（2）Ceramic particle Jing Guo coupling agent treatment is subjected to cladding processing with modifying agent；
（3）Ceramic particle after cladding and polyethylene, polystyrene, crosslinking agent are extruded with extruder after mixing, Obtain modified polystyrene material.
A kind of above-mentioned wear-resisting modified polystyrene cable, wherein, the conductor thread core is prepared by conductive material Conducting wire；Preferably, the conductor material is one kind in copper, aluminium and its alloy.
Wherein, the shielded layer is made of shielding material；Preferably, the shielding material is composite shielding material.
Wherein, the insulating layer is formed using High Performance Insulation material；Preferably, the insulating materials is compound exhausted Edge material.
Compared with prior art, beneficial effects of the present invention：
1st, modifying agent, coupling agent and the crosslinking that specific aim is screened in the modified polystyrene material that cable serving of the present invention uses Agent species can be formed with ceramic particle and acted synergistically, and improved the compatibility between ceramic particle and polystyrene, made modified polyphenyl The wearability of vinyl material is more preferable, so that the wearability of polystyrene cable is also more preferable.
2nd, the modified polystyrene material that cable serving of the present invention uses is resistance to by controlling the degree of polymerization of polystyrene to make Mill property and processability between be provided with optimum balance relation, so as to get polystyrene cable with the same of superior abrasion resistance When, processability, which does not have, to be severely impacted, has positive effect to largely producing for polystyrene wear-resistant cable.
Embodiment
With reference to test example and embodiment, the present invention is described in further detail.But this should not be understood Following embodiment is only limitted to for the scope of the above-mentioned theme of the present invention, it is all that this is belonged to based on the technology that present invention is realized The scope of invention.
Embodiment 1
A kind of wear-resisting modified polystyrene cable, is followed successively by from inside to outside：
Conductor thread core：Copper conductor；
Insulating layer：Polyethylene composite insulating material；
Shielded layer：Carbon fiber-polyvinyl chloride composite shielding material；
Restrictive coating：It is divided into inner sheath, liner layer, armor and serving；Wherein, serving is prepared by the following method to obtain：
（1）The silicon oxide ceramics that 12 parts of particle diameter is 0.3 μm are handled with 0.5 part of vinyl silanes；
（2）Silicon oxide ceramics Jing Guo coupling agent treatment are carried out at cladding with 3 parts of ethyl orthosilicate and 9 parts of benzoic acid Reason；
（3）By polyethylene that the silicon oxide ceramics after cladding and 25 parts of the degree of polymerization are 800,45 parts of the degree of polymerization be 1300 it is poly- Styrene, 0.2 part three iso-propenyloxysilane of phenyl extruded with extruder after mixing, obtain modified polyphenyl second Alkene material；
（4）Wrapped to form cable serving with modified polystyrene material.
Embodiment 2
A kind of wear-resisting modified polystyrene cable, is followed successively by from inside to outside：
Conductor thread core：Copper aluminum alloy wire；
Insulating layer：Polyethylene composite insulating material；
Shielded layer：Carbon fiber-polystyrene composite shielding material；
Restrictive coating：It is divided into inner sheath, liner layer, armor and serving；Wherein, serving is prepared by the following method to obtain：
（（1）The silicon nitride ceramics that 8 parts of particle diameter is 0.6 μm is handled with 0.3 part of vinyl silanes；
（2）Silicon nitride ceramics Jing Guo coupling agent treatment is carried out at cladding with 4 parts of ethyl orthosilicate and 6 parts of benzoic acid Reason；
（3）By polyethylene that the silicon nitride ceramics after cladding and 30 parts of the degree of polymerization are 600,55 parts of the degree of polymerization be 1000 it is poly- Styrene, 0.1 part three iso-propenyloxysilane of phenyl extruded with extruder after mixing, obtain modified polyphenyl second Alkene material；
（4）Wrapped to form cable serving with modified polystyrene material.
Embodiment 3
A kind of wear-resisting modified polystyrene cable, is followed successively by from inside to outside：
Conductor thread core：Aluminum conductor；
Insulating layer：Polyethylene composite insulating material；
Sealant：Silicon rubber；
Shielded layer：Carbon fiber-polystyrene composite shielding material；
Restrictive coating：It is divided into inner sheath, liner layer, armor and serving；Wherein, serving is prepared by the following method to obtain：
（1）The silicon carbide ceramics that 15 parts of particle diameter is 3 μm is handled with 0.8 part of vinyl silanes；
（2）Silicon carbide ceramics Jing Guo coupling agent treatment is carried out at cladding with 5 parts of ethyl orthosilicate and 10 parts of benzoic acid Reason；
（3）It is 1800 by polyethylene that the silicon carbide ceramics after cladding and 20 parts of the degree of polymerization are 1000,35 parts of the degree of polymerization Polystyrene, 0.3 part three iso-propenyloxysilane of phenyl extruded with extruder after mixing, obtain modified polyphenyl Vinyl material；
（4）Wrapped to form cable serving with modified polystyrene material.
Comparative example 1
A kind of cable, is followed successively by from inside to outside：
Conductor thread core：Copper conductor；
Insulating layer：Polyethylene composite insulating material；
Shielded layer：Carbon fiber-polyvinyl chloride composite shielding material；
Restrictive coating：It is divided into inner sheath, liner layer, armor and serving；Wherein, serving is prepared by the following method to obtain：
（1）The silicon oxide ceramics that 12 parts of particle diameter is 0.3 μm are handled with 0.5 part of vinyl silanes；
（2）It is by polyethylene that the silicon oxide ceramics Jing Guo coupling agent treatment are 800 with 25 parts of the degree of polymerization, 45 parts of the degree of polymerization 1300 polystyrene, 0.2 part three iso-propenyloxysilane of phenyl extruded with extruder after mixing, changed Property polystyrene material；
（3）Wrapped to form cable serving with modified polystyrene material.
Comparative example 2
A kind of cable, is followed successively by from inside to outside：
Conductor thread core：Copper conductor；
Insulating layer：Polyethylene composite insulating material；
Shielded layer：Carbon fiber-polyvinyl chloride composite shielding material；
Restrictive coating：It is divided into inner sheath, liner layer, armor and serving；Wherein, inner sheath and serving are made by the following method It is standby to obtain：
（1）The silicon oxide ceramics that 12 parts of particle diameter is 0.3 μm are handled with 0.5 part of vinyl silanes；
（2）Silicon oxide ceramics Jing Guo coupling agent treatment are carried out at cladding with 3 parts of ethyl orthosilicate and 9 parts of benzoic acid Reason；
（3）By polyethylene that the silicon oxide ceramics after cladding and 25 parts of the degree of polymerization are 550,45 parts of the degree of polymerization be 900 it is poly- Styrene, 0.2 part three iso-propenyloxysilane of phenyl extruded with extruder after mixing, obtain modified polyphenyl second Alkene material；
（4）Wrapped to form cable serving with modified polystyrene material.
Comparative example 3
A kind of cable, is followed successively by from inside to outside：
Conductor thread core：Copper conductor；
Insulating layer：Polyethylene composite insulating material；
Shielded layer：Carbon fiber-polyvinyl chloride composite shielding material；
Restrictive coating：It is divided into inner sheath, liner layer, armor and serving；Wherein, serving is prepared by the following method to obtain：
（1）The silicon oxide ceramics that 12 parts of particle diameter is 0.3 μm are handled with 0.5 part of vinyl silanes；
（2）Silicon oxide ceramics Jing Guo coupling agent treatment are carried out at cladding with 3 parts of ethyl orthosilicate and 9 parts of benzoic acid Reason；
（3）By polyethylene that the silicon oxide ceramics after cladding and 25 parts of the degree of polymerization are 800,45 parts of the degree of polymerization be 2000 it is poly- Styrene, 0.2 part three iso-propenyloxysilane of phenyl extruded with extruder after mixing, obtain modified polyphenyl second Alkene material；
（4）Wrapped to form cable serving with modified polystyrene material.
Comparative example 4
A kind of cable, is followed successively by from inside to outside：
Conductor thread core：Copper conductor；
Insulating layer：Polyethylene composite insulating material；
Shielded layer：Carbon fiber-polyvinyl chloride composite shielding material；
Restrictive coating：It is divided into inner sheath, liner layer, armor and serving；Wherein, inner sheath and serving pass through method system It is standby to obtain：
（2）Silicon oxide ceramics Jing Guo coupling agent treatment are carried out at cladding with 3 parts of ethyl orthosilicate and 9 parts of benzoic acid Reason；
（3）By polyethylene that the silicon oxide ceramics after cladding and 25 parts of the degree of polymerization are 800,45 parts of the degree of polymerization be 1300 it is poly- Extruded after styrene, 0.2 part of benzoyl peroxide silane mixture are uniform with extruder, obtain modified polystyrene material Material；
（4）Wrapped to form cable serving with modified polystyrene material.
By the cable in above-described embodiment 1-3 and comparative example 1-4, performance detection is carried out, record result is as follows：
Numbering Wearability Processability
Embodiment 1 ++++ +++
Embodiment 2 ++++ +++
Embodiment 3 ++++ +++
Comparative example 1 ++ ++
Comparative example 2 ++++ +
Comparative example 3 ++ ++++
Comparative example 4 ++ ++
Note："+" is more, represents that performance is better.
Above-mentioned analysis of experimental results is understood, the wear-resisting modified polystyrene cable of the invention in embodiment 1-3, wearability Good, processability is good；And the modified polystyrene material used in comparative example 1 does not coat ceramic particle using modifying agent, The compatibility poor of ceramic particle in polystyrene, the wearability humidification of modified polystyrene material reduce, processability It is deteriorated, so as to cause cable processability to be deteriorated, wearability is deteriorated；The polymerization of modified polystyrene material polyethylene in comparative example 2 Degree is too small, and the processability of modified polystyrene material is deteriorated, and cable processability is deteriorated；Modified polystyrene material in comparative example 3 The degree of polymerization of polystyrene is big, and modified polystyrene material processability improves, but wearability significantly reduces, the cable caused Wearability is deteriorated；Modified polystyrene material changes crosslinking agent in comparative example 4, and the wearability of modified polystyrene material, add Work reduces.

Claims (9)

1. a kind of wear-resisting modified polystyrene cable, including：An at least conductor thread core, be paperwrapped in it is exhausted outside the conductor thread core Edge layer, the shielded layer being paperwrapped in outside the insulating layer, cladding are around in the restrictive coating outside the shielded layer；The restrictive coating includes Inner sheath, liner layer, armor and serving；It is characterized in that, the serving using modified polystyrene material prepare and Into；The modified polystyrene material is prepared including following parts by weight raw material：8-15 parts of ceramic particle, 10-15 The modifying agent of part, 20-30 parts of polyethylene, 35-55 parts of polystyrene, 0.3-0.8 parts of coupling agent, 0.3-0.5 parts of friendship Join agent；The mixture that the modifying agent forms for ethyl orthosilicate with benzoic acid；The polyethylene polymerization degree is 600- 1000；The polystyrene degree of polymerization is 1000-1800；The coupling agent is vinyl silanes；The crosslinking agent is To three iso-propenyloxysilane of phenyl.
2. cable according to claim 1, it is characterised in that the ceramic particle particle diameter is 0.01-2 μm.
3. cable according to claim 1, it is characterised in that the ceramic particle is silicon oxide ceramics, silicon nitride is made pottery One or more in porcelain, silicon carbide ceramics.
4. cable according to claim 1, it is characterised in that the thing of benzoic acid and ethyl orthosilicate in the modifying agent The ratio between amount of matter is 1 ︰ 3.
5. cable according to claim 1, it is characterised in that the degree of polymerization of the ethyl orthosilicate is 750-850.
6. cable according to claim 5, it is characterised in that the degree of polymerization of the ethyl orthosilicate is 800.
7. cable according to claim 1, it is characterised in that the degree of polymerization of the polystyrene is 1200-1500.
8. cable according to claim 7, it is characterised in that the degree of polymerization of the polystyrene is 1300.
9. cable according to claim 1, it is characterised in that the modified polystyrene material passes through following steps system It is standby to obtain：
（1）Ceramic particle is handled with coupling agent；
（2）Ceramic particle Jing Guo coupling agent treatment is subjected to cladding processing with modifying agent；
（3）Ceramic particle after cladding and polyethylene, polystyrene, crosslinking agent are extruded with extruder after mixing, Obtain modified polystyrene material.
CN201711050522.2A 2017-10-31 2017-10-31 A kind of wear-resisting modified polystyrene cable Withdrawn CN107936394A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711050522.2A CN107936394A (en) 2017-10-31 2017-10-31 A kind of wear-resisting modified polystyrene cable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711050522.2A CN107936394A (en) 2017-10-31 2017-10-31 A kind of wear-resisting modified polystyrene cable

Publications (1)

Publication Number Publication Date
CN107936394A true CN107936394A (en) 2018-04-20

Family

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Country Status (1)

Country Link
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