CN107216539B - Irradiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath material for nuclear power station cable, preparation method thereof and cable product - Google Patents

Irradiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath material for nuclear power station cable, preparation method thereof and cable product Download PDF

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CN107216539B
CN107216539B CN201710459205.XA CN201710459205A CN107216539B CN 107216539 B CN107216539 B CN 107216539B CN 201710459205 A CN201710459205 A CN 201710459205A CN 107216539 B CN107216539 B CN 107216539B
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resistant
cable
ethylene
nuclear power
retardant
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CN107216539A (en
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刘飞伟
施冬梅
宋刚
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Shanghai Zhizheng New Material Co., Ltd
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    • 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
    • C08L23/08—Copolymers of ethene
    • C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
    • C08L23/0853—Vinylacetate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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    • 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
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    • 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
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    • C08L2207/068—Ultra high molecular weight polyethylene
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    • C08L2312/00—Crosslinking
    • C08L2312/06—Crosslinking by radiation
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    • 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
    • H—ELECTRICITY
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    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
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    • 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
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    • 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
    • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
    • 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
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Abstract

The invention discloses an irradiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath material for a nuclear power station cable, a preparation method thereof and a cable product, wherein the irradiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath material for the nuclear power station cable comprises the following components: ethylene-vinyl acetate copolymer (EVM), ethylene-octene copolymer (POE), ultra-high-component polyethylene (UHMWPE), polyvinylidene fluoride (PVDF), compatilizer, flame retardant synergist, radiation-resistant assistant, composite antioxidant, crosslinking assistant and lubricant. After irradiation crosslinking, the wire and cable product prepared from the cable sheath material has the characteristics of good oil resistance, wear resistance, torque resistance, flame retardance and the like, has excellent long-term aging performance, and can meet the requirement of 60 years (90 degrees) of service life of a third-generation nuclear power station; and has excellent radiation resistance, and can be used in the severe environment of a nuclear power plant.

Description

Irradiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath material for nuclear power station cable, preparation method thereof and cable product
Technical Field
The invention belongs to the field of low-smoke halogen-free sheathing materials for nuclear power stations, and particularly relates to an irradiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheathing material for nuclear power station cables, a preparation method thereof and a cable product.
Background
As a clean energy, nuclear power is one of the main directions of energy development in the future society. According to the thirteen-five electric power planning released by the national energy agency, the general principle is to accelerate adjustment and optimization, transformation and upgrade and construct a clean, low-carbon, safe and efficient modern electric power industry system, and nuclear power is also very important as an important part in constructing a clean and low-carbon energy system.
Through decades of development, the nuclear power technology enters the third generation, and the third generation nuclear power has higher service life requirement (90 degrees for 60 years), stable irradiation resistance and electrical performance, good flame retardant property, low smoke, zero halogen, low toxicity and other characteristics on the cable material.
The existing extrusion resin of the cable material for the nuclear power station generally adopts polyethylene, cross-linked polyethylene, ethylene-vinyl acetate copolymer and the like, and the mechanical property and the electrical property of the material are obviously deteriorated under the conditions of long-term thermal aging and radiation aging.
Although the domestic nuclear power station cable material is partially made into a home, the types of the cables are concentrated on general categories such as power, control, instruments and compensation, the types are not rich enough, and the cable materials which are specially required by special occasions, such as communication, cabinets, fire resistance and the like, are still not developed and applied further.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and the irradiation crosslinking low-smoke halogen-free flame-retardant cable sheath material which can be used in a nuclear power station environment for a long time, is oil-resistant, wear-resistant and torque-resistant.
The second purpose of the invention is to obtain a preparation method of the irradiation crosslinking low-smoke halogen-free flame-retardant cable sheath material which overcomes the defects of the prior art, can be used in a nuclear power station environment for a long time, and has oil resistance, wear resistance and torque resistance.
The third purpose of the invention is to obtain an irradiation crosslinking low-smoke halogen-free flame-retardant cable product which overcomes the defects of the prior art, can be used for a long time in the environment of a nuclear power station, and has oil resistance, wear resistance and torque resistance.
The invention relates to a radiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath material for a nuclear power station cable, which is taken as a first aspect, and comprises the following components: ethylene-vinyl acetate copolymer (EVM), ethylene-octene copolymer (POE), ultra-high-component polyethylene (UHMWPE), polyvinylidene fluoride (PVDF), compatilizer, flame retardant synergist, radiation-resistant assistant, composite antioxidant, crosslinking assistant and lubricant;
the cable material comprises the following components in parts by mass:
Figure BDA0001324467480000021
in a preferred embodiment of the present invention, the ethylene-vinyl acetate copolymer (EVM) has a Vinyl Acetate (VA) content of 40 to 60%, and the ethylene-vinyl acetate copolymer (EVM) has a melt index of 0.5 to 2g/10 min; measured by the GB/T3682-2000 method.
In a preferred embodiment of the present invention, the ethylene-octene copolymer (POE) has a melt index of 0.5-3.5 g/10min, as determined by GB/T3682-2000 method.
In a preferred embodiment of the present invention, the ultra-high-component polyethylene (UHMWPE) has a molecular weight of 150-500 ten thousand.
In a preferred embodiment of the present invention, the polyvinylidene fluoride (PVDF) has a crystallinity of 60% to 80%.
In a preferred embodiment of the present invention, the compatibilizer is at least one of ethylene-vinyl acetate copolymer grafted maleic anhydride, ethylene-octylene copolymer grafted maleic anhydride, and PE grafted maleic anhydride; wherein the grafting rate of the maleic anhydride is 0.5-2.5%.
In a preferred embodiment of the invention, the flame retardant is a flame retardant system compounded by magnesium hydroxide and zinc borate, and the weight ratio of the flame retardant is 60-100: 20-40.
In a preferred embodiment of the invention, the flame retardant synergist is at least one of hexaphenoxycyclotriphosphazene, melamine polyphosphate (MPP), alkyl phosphinate and white red phosphorus.
In a preferred embodiment of the present invention, the radiation-resistant auxiliary agent is at least one of lead sulfate, boron carbide and boron nitride.
In a preferred embodiment of the invention, the composite antioxidant consists of an antioxidant and a stabilizer, and the weight ratio of the antioxidant to the stabilizer is 1-5: 1-5; wherein the antioxidant consists of hindered phenol antioxidant, thioester antioxidant and phosphite antioxidant, and the weight ratio of the hindered phenol antioxidant to the thioester antioxidant is 1: 1-2: 1-4; the stabilizer is at least one of titanium dioxide, zinc oxide and hydrotalcite.
In a preferred embodiment of the present invention, the crosslinking assistant is one or a mixture of any two or more of triallyl hydroxyurate (TAC), triallyl isocyanurate (TAIC), trimethylolpropane trimethacrylate (TMPTMA), and 1, 2-polybutadiene.
In a preferred embodiment of the present invention, the lubricant is one or a mixture of any two or more of polyethylene wax, microcrystalline paraffin, zinc stearate, and silicone master batch.
The preparation method of the irradiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath material for the nuclear power station cable comprises the steps of mixing ethylene-vinyl acetate copolymer (EVM), ethylene-octene copolymer (POE), ultra-high-component polyethylene (UHMWPE), polyvinylidene fluoride (PVDF), a compatilizer, a flame retardant synergist, a radiation-resistant assistant, a composite antioxidant, a crosslinking assistant and a lubricant, putting the mixture into a high-speed mixer, stirring the mixture for 3 to 5 minutes at room temperature, uniformly mixing the mixture, adding the mixture into an internal mixer to carry out internal mixing, and carrying out internal mixing on the internally mixed dough-shaped material. Adding a double screw into a double-cone forced feeding machine to extrude and granulate, wherein the temperature of each section of the screw is as follows: the feeding section is 190-180 ℃, the conveying section is 190-180 ℃, the melting section is 180-170 ℃, and the machine head is 180-170 ℃.
The irradiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath for the nuclear power station cable, which is the third aspect of the invention, is prepared from the irradiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath material.
Detailed Description
The inventor of the invention obtains an irradiation crosslinking low-smoke halogen-free flame-retardant cable sheath material which can be used in a nuclear power station environment for a long time, has long-term aging resistance, radiation resistance, harsh environment resistance, oil resistance, wear resistance and torque resistance through improving a formula. The irradiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath material for the nuclear power station cable overcomes the defects of the traditional low-smoke halogen-free cable material, so that the material has excellent long-term aging resistance, harsh environment resistance, radiation resistance, flame retardance, oil resistance, wear resistance, torque resistance and comprehensive mechanical properties, and the invention is completed on the basis.
The components of the irradiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath material for the nuclear power station are described in detail as follows:
ethylene-vinyl acetate copolymer (EVM)
The ethylene-vinyl acetate copolymer (EVM) resin is soft and torque-resistant, and has excellent oil resistance, flame retardant property and processability. The ethylene-vinyl acetate copolymer (EVM) has the Vinyl Acetate (VA) content of 40-60 percent and the melt index of 0.5-2 g/10min, and is determined by a GB/T3682-2000 method.
Ethylene-propylene copolymer (POE)
Ethylene-propylene copolymers (POE) have excellent elasticity and excellent mechanical properties. The melt index of the ethylene-octene copolymer (POE) is 0.5-3.5 g/10min, and is determined by a GB/T3682-2000 method.
Ultra-high component polyethylene (UHMWPE)
Ultra-high-component polyethylene has excellent wear resistance, self-lubricity, radiation resistance and corrosion resistance, and is excellent in mechanical properties. The ultra-high molecular weight polyethylene (UHMWPE) of the present invention has a molecular weight of 150-500 ten thousand.
Polyvinylidene fluoride (PVDF)
The polyvinylidene fluoride has excellent flame retardant property, wear resistance, corrosion resistance and radiation resistance, and has the best processing property and mechanical property in fluoroplastics. The crystallinity of the polyvinylidene fluoride (PVDF) of the invention is 60 to 80 percent.
Compatilizer
A compatibilizing agent is used to enhance the compatibility of the flame retardant or other component with the matrix resin. The compatilizer is at least one of ethylene-vinyl acetate copolymer grafted maleic anhydride, ethylene-octylene copolymer grafted maleic anhydride and PE grafted maleic anhydride; the maleic anhydride grafting rate of the material is 0.5-2.5%.
Flame retardant
The flame retardant is a flame retardant system compounded by inorganic magnesium hydroxide and zinc borate, has good synergistic effect and good low-smoke halogen-free synergistic flame retardant effect. The flame retardant of the invention adopts a flame retardant system compounded by magnesium hydroxide and zinc borate, and the weight ratio of the flame retardant is 60-100: 20-40.
Flame-retardant synergist
The flame-retardant synergist is an additive for improving the flame-retardant effect of the flame retardant, and can effectively reduce the addition of the inorganic flame retardant on the premise of not influencing the flame-retardant efficiency. The flame retardant synergist is at least one of hexaphenoxycyclotriphosphazene, melamine polyphosphate (MPP), alkyl phosphinate and whiteness red phosphorus.
Radiation-resistant auxiliary agent
The cable material disclosed by the invention is used in a long-term high-energy particle radiation environment, and the existence of the radiation-proof modifier can enable the material to have excellent radiation-proof performance. The radiation-resistant auxiliary agent is at least one of lead sulfate, boron carbide and boron nitride.
Composite antioxidant
Antioxidants refer to agents that prevent or inhibit factors such as oxygen, heat, light, ozone, mechanical stress, heavy metal ions, etc., from degrading the performance of the article and extending the shelf-life and service life of the article. The antioxidant used in the invention is compounded by the antioxidant and the stabilizer, has excellent long-term aging resistance, does not change color after long-term use, and does not influence the electrical property and the mechanical property of the material. The composite antioxidant consists of an antioxidant and a stabilizer, and the weight ratio of the antioxidant to the stabilizer is 1-5: 1-5; wherein the antioxidant consists of hindered phenol antioxidant, thioester antioxidant and phosphite antioxidant, and the weight ratio of the hindered phenol antioxidant to the thioester antioxidant is 1: 1-2: 1-4; the stabilizer is at least one of titanium dioxide, zinc oxide and hydrotalcite.
Crosslinking aid
The crosslinking assistant is added to the chemical crosslinking cable material of the present invention to promote further crosslinking of the material, and the crosslinking agent added to the chemical crosslinking cable material of the present invention is not particularly limited, and various commercially available crosslinking assistants may be used as long as the object of the present invention is not limited. The crosslinking assistant is at least one of triallyl hydroxyureate (TAC), triallyl isocyanurate (TAIC), trimethylolpropane trimethacrylate (TMPTMA), 1, 2-polybutadiene, benzoyl peroxide and diethylaminopropylamine. Preferably at least one of triallyl hydroxyurate (TAC), triallyl isocyanurate (TAIC), trimethylolpropane trimethacrylate (TMPTMA).
Lubricant agent
Lubricants are aids used to improve the processability of materials. The processing aid used in the present invention is not particularly limited as long as it does not limit the object of the present invention. The lubricant is one or a mixture of polyethylene wax, microcrystalline paraffin, zinc stearate and silicone master batch as the processing aid.
The invention also provides an oil-resistant, wear-resistant and torque-resistant irradiation crosslinking low-smoke halogen-free flame-retardant cable product for a nuclear power station, which is prepared from the irradiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath material for the nuclear power station cable. The cable product can meet the service life of a third-generation nuclear power station at 90-degree for 60 years, meets the requirement of the radiation resistance of the cable of the nuclear power station, and has excellent flame retardance, oil resistance, wear resistance, torque resistance and comprehensive mechanical properties.
Preparation method
The invention also provides a preparation method of the irradiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath material for the nuclear power station cable, which comprises the steps of mixing ethylene-vinyl acetate copolymer (EVM), ethylene-octene copolymer (POE), ultra-high-component polyethylene (UHMWPE), polyvinylidene fluoride (PVDF), compatilizer, flame retardant synergist, radiation-resistant assistant, composite antioxidant, crosslinking assistant and lubricant, putting into a high-speed mixer, stirring for 3-5 minutes at room temperature, uniformly mixing, adding into an internal mixer for internal mixing, and mixing the internally mixed dough. Adding a double screw into a double-cone forced feeding machine to extrude and granulate, wherein the temperature of each section of the screw is as follows: the feeding section is 190-180 ℃, the conveying section is 190-180 ℃, the melting section is 180-170 ℃, and the machine head is 180-170 ℃.
It is to be understood that the ingredients and amounts of the ethylene-vinyl acetate copolymer (EVM), ethylene-octene copolymer (POE), ultra-high-component polyethylene (UHMWPE), polyvinylidene fluoride (PVDF), compatibilizers, flame retardants, flame retardant synergists, radiation resistance aids, compounding antioxidants, crosslinking aids, lubricants, etc. described in this section are as described elsewhere herein.
The irradiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath material for the nuclear power station cable, the preparation method and the cable product have the following advantages:
1. the special resin and the flame retardant are compounded, so that the prepared cable material is simple in processing technology, high in extrusion speed, low in equipment investment and excellent in comprehensive cost performance.
2. The cable product prepared by the cable material can meet the requirements of 90-degree 60-year service life and cable radiation resistance of a third-generation nuclear power station.
3. The irradiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath material disclosed by the invention has excellent flame-retardant, oil-resistant, wear-resistant and torque-resistant performances, and can be applied to special occasions such as cabinets of nuclear power stations.
As used herein, the terms "comprising" or "including" or "employing" mean that the various ingredients may be used together in a mixture or composition of the invention. Thus, the terms "consisting essentially of and" consisting of are encompassed by the terms "comprising" or "including" or "employing.
Other aspects of the invention will be apparent to those skilled in the art in view of the disclosure herein.
Unless otherwise specified, various starting materials of the present invention are commercially available; or prepared according to conventional methods in the art. Unless defined or stated otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention. Other aspects of the invention will be apparent to those skilled in the art in view of the disclosure herein.
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The experimental methods of the following examples, which are not specified under specific conditions, are generally determined according to national standards. If there is no corresponding national standard, it is carried out according to the usual international standards, to the conventional conditions or to the conditions recommended by the manufacturer. All parts are parts by weight unless otherwise indicated.
Unless defined or stated otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention.
Example 1
The names and parts by weight of the components of the formulation of example 1 are shown in table 1:
TABLE 1
Figure BDA0001324467480000071
Figure BDA0001324467480000081
The preparation method comprises the steps of mixing ethylene-vinyl acetate copolymer (EVM), ethylene-octene copolymer (POE), ultra-high-component polyethylene (UHMWPE), polyvinylidene fluoride (PVDF), compatilizer, flame retardant synergist, radiation-resistant assistant, composite antioxidant, crosslinking assistant and lubricant, putting into a high-speed mixer, stirring for 3-5 minutes at room temperature, uniformly mixing, adding into an internal mixer for internal mixing, and mixing the internally mixed dough. Adding a double screw into a double-cone forced feeding machine to extrude and granulate, wherein the temperature of each section of the screw is as follows: the feeding section is 190-180 ℃, the conveying section is 190-180 ℃, the melting section is 180-170 ℃, and the machine head is 180-170 ℃.
The cable material in example 1 was subjected to performance testing tests, and the respective performance values are shown in table 7 of performance example.
Example 2
The names and parts by weight of the components of the formulation of example 2 are shown in table 2:
TABLE 2
Figure BDA0001324467480000082
The preparation method of this example is the same as example 1.
The product of example 2 was tested for property detection and the values of each property are shown in table 7 for the performance examples.
Example 3
The names and parts by weight of the components of the formulation of example 3 are shown in table 3:
TABLE 3
Figure BDA0001324467480000091
The preparation method of this example is the same as example 1.
The product of example 3 was tested for property detection and the values of each property are shown in table 7 for the performance examples.
Example 4
The names and parts by weight of the components of the formulation of example 4 are shown in table 4:
TABLE 4
Figure BDA0001324467480000092
Figure BDA0001324467480000101
The preparation method of this example is the same as example 1.
The product of example 4 was tested for property detection and the values of each property are shown in table 7 for the performance examples.
Example 5
The names and parts by weight of the components of the formulation of example 5 are shown in table 5:
TABLE 5
Figure BDA0001324467480000102
The preparation method of this example is the same as example 1.
The product of example 5 was tested for property detection and the values of each property are shown in table 7 for the performance examples.
Example 6
The names and parts by weight of the components of the formulation of example 6 are shown in table 6:
TABLE 6
Figure BDA0001324467480000103
Figure BDA0001324467480000111
The preparation method of this example is the same as example 1.
The product of example 6 was tested for property detection and the values of each property are shown in table 7 for the performance examples.
Examples of Performance
The product performance was tested as follows:
(1) and (3) testing tensile property:
testing the tensile property of the irradiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath material for the nuclear power station cable according to the GB/T1040-2008 standard;
(2) thermal life
Evaluating the thermal life of the irradiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath material for the nuclear power station cable according to the GB/T1102.1-2003 standard;
(3) radiation resistance
Judging the long-term radiation aging performance of the radiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath material for the nuclear power station cable according to the IEC 61244:2014 standard;
(4) oil resistance
Evaluating the oil resistance of the irradiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath material for the nuclear power station cable according to the GB/T2951.21-2008 standard;
(5) wear resistance
Evaluating the scratch and abrasion resistance of the irradiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath material for the nuclear power station cable according to ISO 6722-2011 standard;
(6) flame retardant properties
And evaluating the flame retardant property of the cable made of the irradiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath material for the nuclear power station cable according to the GB/T18380.34-2008 standard.
(7) Bending resistance and flexibility
According to GB/T5023.2-2008 standard, the bending resistance and flexibility performance of the cable made of the irradiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath material are evaluated
The test results are shown in table 7.
Table 7: EXAMPLES Performance test results
Figure BDA0001324467480000121
As can be seen from the data in Table 7, the radiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath material for the power station cable, which is prepared by the invention, not only meets the requirements of 90-degree 60-year service life and radiation resistance of third-generation nuclear power station cables, but also has excellent performances of flame retardance, wear resistance, oil resistance, torque resistance and the like, can be applied to special occasions in nuclear power stations, and has a wide application prospect.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the scope of the invention, which is defined by the claims appended hereto, and any other technical entity or method that is encompassed by the claims as broadly defined herein, or equivalent variations thereof, is contemplated as being encompassed by the claims. All documents referred to herein are incorporated by reference into this application as if each were individually incorporated by reference. Furthermore, it should be understood that various changes and modifications can be made by those skilled in the art after reading the above disclosure, and equivalents also fall within the scope of the invention as defined by the appended claims.

Claims (3)

1. The utility model provides a wear-resisting moment of torsion low smoke and zero halogen flame retardant cable sheath material of irradiation crosslinking for nuclear power station cable which characterized in that, wear-resisting moment of torsion low smoke and zero halogen flame retardant cable sheath material of irradiation crosslinking contains: ethylene-vinyl acetate copolymer, ethylene-octene copolymer, ultra-high molecular weight polyethylene, polyvinylidene fluoride, compatilizer, flame retardant synergist, radiation-resistant assistant, composite antioxidant, crosslinking assistant and lubricant;
the radiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath material comprises the following components in parts by mass:
40-80 parts of ethylene-vinyl acetate copolymer;
5-20 parts of ethylene-octene copolymer;
5-15 parts of ultrahigh molecular weight polyethylene;
5-15 parts of polyvinylidene fluoride;
5-15 parts of a compatilizer;
80-120 parts of a flame retardant;
5-20 parts of a flame-retardant synergist;
5-10 parts of a radiation-resistant auxiliary agent;
2-10 parts of a composite antioxidant;
0.3-1 part of a crosslinking assistant;
0.3-2 parts of a lubricant;
the content of vinyl acetate in the ethylene-vinyl acetate copolymer is 40-60%, and the melt index of the ethylene-vinyl acetate copolymer is 0.5-2 g/10 min; measured by the GB/T3682-2000 method;
the melt index of the ethylene-octene copolymer is 0.5-3.5 g/10min, and is determined by a GB/T3682-2000 method;
the molecular weight of the ultra-high molecular weight polyethylene is 150-500 ten thousand;
the crystallinity of the polyvinylidene fluoride is 60-80%;
the compatilizer is one of EVA (ethylene vinyl acetate) grafted maleic anhydride, POE (polyolefin elastomer) grafted maleic anhydride or PE (polyethylene) grafted maleic anhydride; wherein the grafting rate of maleic anhydride is 0.5-2.5%;
the flame retardant adopts a flame retardant system compounded by magnesium hydroxide and zinc borate, and the weight ratio of the flame retardant to the flame retardant is 60-100: 20-40 parts of;
the flame-retardant synergist is one of hexaphenoxycyclotriphosphazene, melamine polyphosphate, alkyl phosphinate and whiteness red phosphorus;
the radiation-resistant auxiliary agent is one of lead sulfate, boron carbide and boron nitride;
the composite antioxidant consists of an antioxidant and a stabilizer, and the weight ratio of the antioxidant to the stabilizer is 1-5: 1-5; wherein the antioxidant consists of hindered phenol antioxidant, thioester antioxidant and phosphite antioxidant, and the weight ratio of the hindered phenol antioxidant to the thioester antioxidant is 1: 1-2: 1-4; the stabilizer is zinc oxide or hydrotalcite;
the crosslinking assistant is one of triallyl cyanurate, triallyl isocyanurate, trimethylolpropane trimethacrylate and 1, 2-polybutadiene;
the lubricant is one of polyethylene wax, microcrystalline paraffin, zinc stearate and silicone master batch.
2. The preparation method of the irradiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath material for the nuclear power station cable as claimed in claim 1, is characterized in that after an ethylene-vinyl acetate copolymer, an ethylene-octene copolymer, an ultrahigh molecular weight polyethylene, polyvinylidene fluoride, a compatilizer, a flame retardant synergist, a radiation-resistant auxiliary agent, a composite antioxidant, a crosslinking auxiliary agent and a lubricant are mixed, the mixture is placed into a high-speed mixer, stirred for 3-5 minutes at room temperature and uniformly mixed, then the mixture is added into an internal mixer for internal mixing, and the internally mixed dough-like material is added; adding a double screw into a double-cone forced feeding machine to extrude and granulate, wherein the temperature of each section of the screw is as follows: the feeding section is 190-180 ℃, the conveying section is 190-180 ℃, the melting section is 180-170 ℃, and the machine head is 180-170 ℃.
3. An irradiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath for a nuclear power station cable is prepared from the irradiation crosslinking wear-resistant torque-resistant low-smoke halogen-free flame-retardant cable sheath material of claim 1.
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CN109651691B (en) * 2018-12-04 2022-05-13 上海至正新材料有限公司 Low-temperature-resistant oil-resistant torsion-resistant low-smoke halogen-free flame-retardant wind energy cable sheath material and preparation method and application thereof
CN109553848A (en) * 2018-12-18 2019-04-02 四川安费尔高分子材料科技有限公司 A kind of high-flame-retardance low-smoke halogen-free cable material and preparation method thereof
CN110534235A (en) * 2019-07-23 2019-12-03 安徽电缆股份有限公司 A kind of three generations's nuclear power station harsh environment cable
CN110951141B (en) * 2019-12-11 2021-07-02 上海凯波电缆特材股份有限公司 Double-layer co-extrusion insulation LED ultraviolet light cross-linking color low-smoke halogen-free flame-retardant cable material and preparation method thereof

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