CN114989524A - Cross-linked bonding type conductor shielding material and preparation method thereof - Google Patents
Cross-linked bonding type conductor shielding material and preparation method thereof Download PDFInfo
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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
- C08L23/08—Copolymers of ethene
- C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
- C08L23/0853—Vinylacetate
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Abstract
The invention relates to the field of C08L23/08, in particular to a cross-linked bonding type conductor shielding material and a preparation method thereof, which adopt 80-110 parts of ethylene-vinyl acetate copolymer, 70-90 parts of conductive carbon black, 15-25 parts of lubricating composition, 0.8-1.5 parts of cross-linking agent, 0.5-1 part of auxiliary cross-linking agent and 0.8-2.5 parts of other functional auxiliary agent, so that the provided cross-linked bonding type conductor shielding material has good bonding property with an insulating layer material, and simultaneously has excellent mechanical property, thermal stability and thermal extensibility, and can be used as a shielding layer material between a conductor and an insulation space or an insulating outer shielding layer material, thereby avoiding insulation damage caused by electric field stress concentration when electrified, and ensuring the safe operation of a cable.
Description
Technical Field
The invention relates to the field of C08L23/08, in particular to a cross-linked bonding type conductor shielding material and a preparation method thereof.
Background
At present, cross-linkable polyethylene (XLPE) is used as a preferred material for producing insulating layers of medium and high voltage cables, and the XLPE cables generally adopt a co-extrusion process of an inner semi-conductive shielding layer, an outer semi-conductive shielding layer and an intermediate insulating layer. The semiconductive shielding layer is a semiconductive composite material used in the crosslinked cable for protecting the main insulating layer from being damaged, and the performance of the semiconductive composite material directly determines the quality of the crosslinked cable. The smoothness of the semiconductive shielding layer of the crosslinked cable, the adhesion between the shielding layer and the insulating layer, impurities in the semiconductive shielding material and the like have great influence on the performance of the crosslinked cable.
Chinese patent application CN113698723A discloses a polypropylene-based thermoplastic semiconductive shielding material for an environment-friendly cable and a preparation method thereof, wherein the mechanical property of polypropylene is improved by adopting copolymerization polypropylene and conductive carbon black under the condition of the existence of a lubricant, but the problem of uneven distribution of the carbon black in a polypropylene matrix cannot be effectively solved, and further the comprehensive performance of the shielding material is influenced. Chinese patent application CN110305398A discloses a silane crosslinking type semi-conductive strippable outer shielding material and a production process thereof, wherein a high-conductivity material A and a catalytic material B with the mass ratio of 7-10: 1 are mixed and extruded and then are subjected to warm water crosslinking to prepare the silane crosslinking type semi-conductive strippable outer shielding material, and although the yield and the crosslinking stability are improved to a certain degree, the adhesion between the silane crosslinking type semi-conductive strippable outer shielding material and an insulating layer material is insufficient, so that gaps can be formed between the insulating layer and the shielding layer in the processing and using processes, and the operation stability and the service life of a cable are influenced.
Therefore, the cross-linked bonding type conductor shielding material provided by the invention has good bonding performance with an insulating layer material, and simultaneously has excellent mechanical property, thermal stability and thermal extensibility, and is used as a shielding layer material between a conductor and an insulator or an insulating outer shielding layer material, so that the insulation damage caused by electric field stress concentration during electrification is avoided, and the operation safety of a cable is ensured.
Disclosure of Invention
The invention provides a cross-linked adhesive conductor shielding material, which at least comprises the following raw materials in parts by weight: 80-110 parts of ethylene-vinyl acetate copolymer, 70-90 parts of conductive carbon black, 15-25 parts of lubricating composition, 0.8-1.5 parts of cross-linking agent, 0.5-1 part of auxiliary cross-linking agent and 0.8-2.5 parts of other functional auxiliary agent.
As a preferred technical scheme, the melt mass flow rate (190 ℃/2.16kg) of the ethylene-vinyl acetate copolymer is 2.3-3.1g/10 min; as a preferable technical scheme, the content of the vinyl acetate in the ethylene-vinyl acetate copolymer is 17.6-20.4 wt%. Preferably, the type of the ethylene-vinyl acetate copolymer is selected from one of 460, 180F, 7350, V5110J and VS 430;
the ethylene-vinyl acetate copolymer was model number V5110J, purchased from the petrochemical-basf llc of the winners.
Based on the system of the invention, by adopting the ethylene-vinyl acetate copolymer with the melt mass flow rate (190 ℃/2.16kg) of 2.3-3.1g/10min, the shielding material system can still keep good processing performance and mechanical property after a large amount of conductive carbon black is added, because polar Vinyl Acetate (VA) monomers are introduced into nonpolar ethylene molecular chains, the crystallinity of Polyethylene (PE) is reduced, the introduction amount of the polar vinyl acetate monomers directly influences the flexibility, transparency, adhesiveness, heat sealing performance and the compatibility with fillers of the material, the inventor finds that the content of vinyl acetate in the ethylene-vinyl acetate copolymer is increased, the compatibility between the ethylene-vinyl acetate copolymer and the conductive carbon black is gradually improved, but the bonding force between the prepared shielding material and a crosslinked polyethylene insulating layer material is smaller, the insulation layer and the shielding layer can be subjected to gaps during processing and use, and the running stability and the service life of the cable are affected. In the process of research, the inventor finds that stable and good adhesion between the provided shielding material and the crosslinked polyethylene insulating layer material is realized by adopting the ethylene-vinyl acetate copolymer with the vinyl acetate content of 17.6-20.4wt%, particularly adopting the ethylene-vinyl acetate copolymer with the type V5110J, and the insulating layer and the shielding layer are prevented from generating gaps in the processing and using processes, so that the operation stability and the service life of the cable are ensured. The inventor probably analyzes the reason that the content of vinyl acetate in the V5110J type ethylene-vinyl acetate copolymer is 18wt%, the melt mass flow rate is 2.7g/10min, and the shielding material and the crosslinked polyethylene insulating layer material are ensured to realize stable and good adhesion due to the fact that the chain segment of the crystallization part in the molecular structure is shorter, the number of long-chain molecules is more, the randomness of the molecular chain is more obvious, and the entanglement is generated under the action of lower shearing force.
As a preferable technical proposal, the conductive carbon black is selected from one of VXC68, #950 (Ningbodetai), Yongdong YD-250C, Zhongjun JE6900 and Black cat 3710; preferably, the conductive carbon black has an oil absorption value of from 79 to 123cc/100 g;
the conductive carbon black was VXC68, purchased from cabot (china).
As a preferred technical scheme, the lubricating composition at least comprises two of 15# white oil, 32# white oil, 54# paraffin, zinc stearate and stearic acid. Preferably, the lubricating composition is a combination of 15# white oil, 32# white oil, zinc stearate; preferably, the mass ratio of the 15# white oil to the 32# white oil to the zinc stearate is (8-12): (6-10): (1-2).
The 15# white oil and the 32# white oil are purchased from Nanjing hong Van petrochemical company Limited.
In the power cable, the smoothness between the interfaces of the insulating layer and the semi-conducting layer is an important factor influencing the service life of the cable, the friction between carbon black, the uneven distribution of the carbon black, polymer gel and environmental pollution are main factors influencing the smoothness between the insulating layer and the semi-conducting layer. In the research process, the inventor finds that the conductive carbon black with the oil absorption value of 79-123cc/100g, especially the conductive carbon black VXC68, can provide the semiconductive shielding material with lower resistivity on the premise of not influencing the thermal extension performance of the shielding material. In order to realize the uniform dispersion of the conductive carbon black in the V5110J type ethylene-vinyl acetate copolymer, the invention introduces the components with the mass ratio of (8-12): (6-10): (1-2) the 15# white oil, the 32# white oil and the zinc stearate are used as lubricating compositions, and are matched with polyethylene wax or oxidized polyethylene wax in a system, so that the carbon black structure is prevented from being damaged in the processing process while the uniform dispersion of the conductive carbon black is ensured, the shielding material is ensured to have lower volume resistivity, and the service life of the cable is further prolonged. The inventor speculates that the reason may be that, at the mass ratio, 15# white oil, 32# white oil and zinc stearate can exert synergistic effect to the greatest extent, so as to realize internal lubrication and external lubrication in the processing production of the shielding material, reduce friction between the conductive carbon black and processing equipment, and uniformly disperse the conductive carbon black in the ethylene-vinyl acetate copolymer in the presence of polyethylene wax or oxidized polyethylene wax, so as to avoid that the surface smoothness of the shielding material is reduced due to a large amount of accumulation of the conductive carbon black in a copolymer system, and a protrusion structure and a tree structure occur, so that the pressure of a local electric field is increased, and the service life of the shielding material is seriously affected.
As a preferable technical scheme, the mass ratio of the cross-linking agent to the auxiliary cross-linking agent is (0.9-1.2): (0.6-0.9); as a preferred technical solution, the cross-linking agent is dicumyl peroxide or di-tert-butylperoxydiisopropylbenzene; as a preferable technical scheme, the auxiliary crosslinking agent is triallyl cyanurate or triallyl isocyanurate. Preferably, the cross-linking agent is di-tert-butylperoxydiisopropylbenzene; the auxiliary crosslinking agent is triallyl isocyanurate. The inventor finds that, in the process of actually producing the shielding material, in the process of crosslinking with the extruded semiconductive shielding material by using dicumyl peroxide as a crosslinking agent, mutual permeation and absorption with the semiconductive shielding material cannot be realized due to the characteristics of dicumyl peroxide, the crosslinking is mainly concentrated on the surface layer of the semiconductive shielding material, the product is not uniformly crosslinked, and the product has insufficient smoothness, and in the research process, the inventor surprisingly finds that, based on the system, by using di-tert-butylperoxydiisopropylbenzene as the crosslinking agent, the tri-functionality auxiliary crosslinking agent triallyl isocyanurate is matched, and the mass ratio of the di-tert-butylperoxydiisopropylbenzene to the triallyl isocyanurate is controlled to be (0.9-1.2): (0.6-0.9), under specific processing conditions, the material can effectively permeate and realize fully uniform crosslinking with the extruded material, so that the smoothness and the thermal stability of the shielding material are ensured, and the service life of the shielding material is prolonged. The inventors may analyze the reason that the introduction of a specific amount of triallyl isocyanurate promotes the crosslinking with di-t-butylperoxy diisopropylbenzene, and under specific processing conditions, di-t-butylperoxy diisopropylbenzene and triallyl isocyanurate permeate into the extruded material to be sufficiently crosslinked, thereby improving the thermal stability and smoothness of the screen.
As a preferred technical scheme, the other functional auxiliary agents at least comprise a dispersing agent, an antioxidant and a copper resisting agent; preferably, the mass ratio of the dispersing agent to the antioxidant to the copper inhibitor is (0.6-1): (0.4-0.8): (0.1-0.3);
preferably, the antioxidant is a combination of antioxidant 300# and antioxidant MD-1024, and the mass ratio of the antioxidant 300# to the antioxidant MD-1024 is (0.2-0.6): (0.1-0.3). The antioxidant 300# is from Qingdao Ruishai New materials Co; the antioxidant MD-1024 is derived from basf.
Preferably, the dispersing agent is polyethylene wax or oxidized polyethylene wax. The polyethylene wax is selected from one of SN100, SN110D, SN9072, SN9088D and SN 9010. The number average molecular weight of the oxidized polyethylene wax is 4000-5000.
Preferably, the copper inhibitor is MDA-5 which is sourced from organic chemical industry Co., Ltd.
In the practical use process of the cable, the ethylene-vinyl acetate copolymer-based shielding material is found to be easy to generate a catalytic aging phenomenon in the presence of heavy metal ions such as copper, iron, manganese, cobalt and the like, lose the use value and shorten the application life, and based on the system, the mass ratio is (0.2-0.6): (0.1-0.3) antioxidant 300# and antioxidant MD-1024, so that the provided shielding material has excellent heat aging resistance, and simultaneously, the provided shielding material and a copper conductor do not generate interaction in cooperation with the copper resistant agent MDA-5 in the system, so that the copper conductor is prevented from being oxidized, the shielding material is prevented from being damaged by copper ions, and the provided shielding material is used as a material matched with a crosslinked polyethylene insulated cable with the rated voltage of 35kV or below and is used as a material of a shielding layer between the conductor and the insulation or a material of an outer insulation shielding layer.
According to the weight portion, the ethylene-vinyl acetate copolymer, the conductive carbon black, the lubricating composition and other functional additives are mixed for 6-8min at the temperature of 140-150 ℃, then extruded, granulated, dehydrated, fed into a high-speed mixer, added with the cross-linking agent and the auxiliary cross-linking agent, mixed for 90-120s at the temperature of 60-70 ℃ and the rotating speed of 1800-2500rpm, boiled and dried, and discharged to obtain the cross-linked adhesive type conductor shielding material.
Advantageous effects
1. The invention provides a cross-linking bonding type conductor shielding material, which has good bonding performance with an insulating layer material, and simultaneously has excellent mechanical property, thermal stability and thermal extension performance, and is used as a shielding layer material between a conductor and an insulator or an insulating outer shielding layer material to avoid insulation damage caused by electric field stress concentration during electrification, thereby ensuring the operation safety of a cable.
2. Based on the system, the ethylene-vinyl acetate copolymer with the vinyl acetate content of 17.6-20.4wt% is adopted, and particularly the ethylene-vinyl acetate copolymer with the model of V5110J is adopted, so that the provided shielding material and the crosslinked polyethylene insulating layer material are stably and well bonded, the insulating layer and the shielding layer are prevented from generating gaps in the processing and using processes, and the running stability and the service life of the cable are ensured.
3. Based on the system, di-tert-butylperoxy diisopropylbenzene is adopted as a crosslinking agent, a trifunctional auxiliary crosslinking agent is matched with triallyl isocyanurate, and the mass ratio of the di-tert-butylperoxy diisopropylbenzene to the triallyl isocyanurate is controlled to be (0.9-1.2): (0.6-0.9), under specific processing conditions, the material can effectively permeate and realize fully uniform crosslinking with the extruded material, so that the smoothness and the thermal stability of the shielding material are ensured, and the service life of the shielding material is prolonged.
4. The invention introduces the following components in the mass ratio of (8-12): (6-10): (1-2) the 15# white oil, the 32# white oil and the zinc stearate are used as lubricating compositions, and are matched with polyethylene wax or oxidized polyethylene wax in a system, so that the carbon black structure is prevented from being damaged in the processing process while the uniform dispersion of the conductive carbon black is ensured, the shielding material is ensured to have lower volume resistivity, and the service life of the cable is further prolonged.
Detailed Description
Example 1
Embodiment 1 of the present invention provides a cross-linked adhesive conductor shielding material, which is prepared from the following raw materials: 95kg of ethylene-vinyl acetate copolymer, 80kg of conductive carbon black, 19.5kg of lubricating composition, 1.1kg of cross-linking agent, 0.7kg of auxiliary cross-linking agent and 1.2kg of other functional auxiliary agents.
The melt mass flow rate (190 ℃/2.16kg) of the ethylene-vinyl acetate copolymer is 2.7g/10 min; the ethylene-vinyl acetate copolymer has a vinyl acetate content of 18 wt%.
The ethylene-vinyl acetate copolymer was model number V5110J, purchased from raisin-basf llc.
The conductive carbon black has an oil absorption value of 123cc/100 g; the conductive carbon black was VXC68, purchased from cabot (china).
The lubricating composition is a combination of 15# white oil, 32# white oil, zinc stearate; the mass ratio of the 15# white oil to the 32# white oil to the zinc stearate is 10: 8: 1.5.
the 15# white oil and the 32# white oil are purchased from Nanjing hong Van petrochemical company Limited.
The mass ratio of the cross-linking agent to the auxiliary cross-linking agent is 1.1: 0.7; the cross-linking agent is di-tert-butylperoxy diisopropylbenzene; the auxiliary crosslinking agent is triallyl isocyanurate. The di-tert-butylperoxy diisopropylbenzene is from Anhui Xiangyun rubber and plastic company, and the triallyl isocyanurate is from Shanghai Tuoyuan new material science and technology company, Inc.
The other functional additives comprise a dispersing agent, an antioxidant and a copper resisting agent; the mass ratio of the dispersing agent to the antioxidant to the copper resisting agent is 0.8: 0.6: 0.2;
the antioxidant is a combination of an antioxidant 300# and an antioxidant MD-1024, and the mass ratio of the antioxidant 300# to the antioxidant MD-1024 is 0.4: 0.2. the antioxidant 300# is from Qingdao Ruishai New materials Co; the antioxidant MD-1024 is derived from basf.
The dispersing agent is polyethylene wax, the model is SN100, and the dispersing agent is purchased from Qingdao Sainuo New Material Co.
The copper resisting agent is MDA-5 and is sourced from organic chemical industry Co., Ltd.
According to the formula, mixing an ethylene-vinyl acetate copolymer, conductive carbon black, a lubricating composition and other functional additives at 150 ℃ for 8min, then extruding, granulating, dehydrating, feeding into a high-speed mixer, adding a cross-linking agent and an auxiliary cross-linking agent, controlling the temperature to be 65 ℃, mixing for 120s at the rotating speed of 2000rpm, boiling, drying, and discharging to obtain the cross-linked adhesive type conductor shielding material.
Example 2
Embodiment 2 of the present invention provides a cross-linked adhesive conductor shielding material, which is prepared from the following raw materials: 100kg of ethylene-vinyl acetate copolymer, 82kg of conductive carbon black, 19kg of lubricating composition, 1kg of cross-linking agent, 0.7kg of auxiliary cross-linking agent and 1.2kg of other functional auxiliary agents.
The melt mass flow rate (190 ℃/2.16kg) of the ethylene-vinyl acetate copolymer is 2.7g/10 min; the content of vinyl acetate in the ethylene-vinyl acetate copolymer is 18 wt%.
The ethylene-vinyl acetate copolymer was model number V5110J, purchased from the petrochemical-basf llc of the winners.
The conductive carbon black has an oil absorption value of 123cc/100 g; the conductive carbon black was VXC68, purchased from cabot (china).
The lubricating composition is a combination of 15# white oil, 32# white oil, zinc stearate; the mass ratio of the 15# white oil to the 32# white oil to the zinc stearate is 10: 8: 1.
the 15# white oil and the 32# white oil are purchased from Nanjing hong Van petrochemical company Limited.
The mass ratio of the cross-linking agent to the auxiliary cross-linking agent is 1: 0.7; the cross-linking agent is bis-tert-butylperoxy-diisopropylbenzene; the auxiliary crosslinking agent is triallyl isocyanurate. The di-tert-butylperoxy diisopropylbenzene is from Anhui Xiangyun rubber and plastic company, and the triallyl isocyanurate is from Shanghai Tuoyuan new material science and technology company, Inc.
The other functional additives comprise a dispersant, an antioxidant and a copper resisting agent; the mass ratio of the dispersing agent to the antioxidant to the copper resisting agent is 0.8: 0.6: 0.2;
the antioxidant is a combination of an antioxidant 300# and an antioxidant MD-1024, and the mass ratio of the antioxidant 300# to the antioxidant MD-1024 is 0.4: 0.2. the antioxidant 300# is from Qingdao Ruishai New materials Co; the antioxidant MD-1024 is derived from basf.
The dispersing agent is oxidized polyethylene wax, the average molecular weight of the oxidized polyethylene wax is 4500, and the oxidized polyethylene wax is purchased from Qingdao Sainuo New Material Co.
The copper resisting agent is MDA-5 and is sourced from organic chemical industry Co., Ltd.
According to the formula, mixing an ethylene-vinyl acetate copolymer, conductive carbon black, a lubricating composition and other functional additives at 150 ℃ for 8min, then extruding, granulating, dehydrating, feeding into a high-speed mixer, adding a cross-linking agent and an auxiliary cross-linking agent, controlling the temperature to be 65 ℃, mixing for 120s at the rotating speed of 2000rpm, boiling, drying, and discharging to obtain the cross-linked adhesive type conductor shielding material.
Example 3
Embodiment 3 of the present invention provides a cross-linked adhesion type conductor shielding material, which comprises the following raw materials: 90kg of ethylene-vinyl acetate copolymer, 80kg of conductive carbon black, 20kg of lubricating composition, 1.2kg of cross-linking agent, 0.8kg of auxiliary cross-linking agent and 1.4kg of other functional auxiliary agents.
The melt mass flow rate (190 ℃/2.16kg) of the ethylene-vinyl acetate copolymer is 2.7g/10 min; the content of vinyl acetate in the ethylene-vinyl acetate copolymer is 18 wt%.
The ethylene-vinyl acetate copolymer was model number V5110J, purchased from raisin-basf llc.
The conductive carbon black has an oil absorption value of 123cc/100 g; the conductive carbon black was VXC68, purchased from cabot (china).
The lubricating composition is a combination of 15# white oil, 32# white oil, zinc stearate; the mass ratio of the 15# white oil to the 32# white oil to the zinc stearate is 9: 9: 2.
the 15# white oil and the 32# white oil are purchased from Nanjing hong Van petrochemical company Limited.
The mass ratio of the cross-linking agent to the auxiliary cross-linking agent is 1.2: 0.8; the cross-linking agent is di-tert-butylperoxy diisopropylbenzene; the auxiliary crosslinking agent is triallyl isocyanurate. The di-tert-butylperoxydiisopropylbenzene is from Anhui Xiangyun rubber and plastic company, and the triallyl isocyanurate is from Shanghai Tuo new material science and technology company, Inc.
The other functional additives comprise a dispersing agent, an antioxidant and a copper resisting agent; the mass ratio of the dispersing agent to the antioxidant to the copper resisting agent is 1: 0.6: 0.2;
the antioxidant is a combination of an antioxidant 300# and an antioxidant MD-1024, and the mass ratio of the antioxidant 300# to the antioxidant MD-1024 is 0.4: 0.2. the antioxidant 300# is from Qingdao Ruishi New materials Co., Ltd; the antioxidant MD-1024 is derived from basf.
The dispersing agent is polyethylene wax with the model number of SN9072 and purchased from Qingdao Sainuo New Material Co.
The copper resisting agent is MDA-5 and is sourced from organic chemical industry Co., Ltd.
According to the formula, mixing an ethylene-vinyl acetate copolymer, conductive carbon black, a lubricating composition and other functional additives at 150 ℃ for 8min, then extruding, granulating, dehydrating, feeding into a high-speed mixer, adding a cross-linking agent and an auxiliary cross-linking agent, controlling the temperature to be 65 ℃, mixing for 120s at the rotating speed of 2000rpm, boiling, drying, and discharging to obtain the cross-linked adhesive type conductor shielding material.
Comparative example 1
Comparative example 1 of the present invention provides a cross-linked adhesion type conductor shield material, which is similar to example 1, except that the ethylene-vinyl acetate copolymer has a melt index of 43g/10 min (190 ℃/2.16kg), has a vinyl acetate content of 32wt%, and is of type R002148, and is purchased from shanghai yan chemical technology co.
Comparative example 2
Comparative example 2 of the present invention provides a cross-linked adhesion type conductor shielding material, which is the same as example 1 except that the conductive carbon black has an oil absorption value of 400 ± 20mL/g and a model number TD-1, and is purchased from delong chemical company ltd, new town city.
Comparative example 3
Comparative example 3 of the present invention provides a crosslinked adhesive conductor shield material, which is similar to example 1 in the specific embodiment, except that the mass ratio of the crosslinking agent to the co-crosslinking agent is 1.5: 0.3, the crosslinking agent is dicumyl peroxide, and the auxiliary crosslinking agent is triallyl cyanurate.
Comparative example 4
Comparative example 4 of the present invention provides a cross-linked adhesive conductor shielding material, which is similar to example 1, except that the antioxidant is 1010, and is obtained from Shanghai Michelin Biotech, Inc.
Performance test method
The cross-linked bonding type conductor shielding materials prepared in the examples and the comparative examples are subjected to performance tests of basic mechanical properties, resistivity and peel strength according to reference industry standard JB/T10738-2007, the standard values and the results of the performance tests are shown in Table 1, and in Table 1, the test conditions of the tensile strength change rate and the elongation at break change rate are as follows: carrying out heat aging in an air box at 135 ℃ for 168 h; the test conditions for elongation and permanent set under load were: at 200 deg.C, 0.2MPa, 15 min; the insulation layer material used in the peel strength test was peroxide crosslinked polyethylene insulation layer material.
TABLE 1,
Claims (5)
1. The cross-linked bonding type conductor shielding material is characterized by at least comprising the following preparation raw materials in parts by weight: 80-110 parts of ethylene-vinyl acetate copolymer, 70-90 parts of conductive carbon black, 15-25 parts of lubricating composition, 0.8-1.5 parts of cross-linking agent, 0.5-1 part of auxiliary cross-linking agent and 0.8-2.5 parts of other functional auxiliary agent;
the ethylene-vinyl acetate copolymer was model number V5110J, purchased from raisin-basf llc;
the cross-linking agent is di-tert-butylperoxy diisopropylbenzene; the auxiliary crosslinking agent is triallyl isocyanurate; the mass ratio of the cross-linking agent to the auxiliary cross-linking agent is (0.9-1.2): (0.6-0.9);
the lubricating composition is a combination of 15# white oil, 32# white oil and zinc stearate, and the mass ratio of the 15# white oil to the 32# white oil to the zinc stearate is (8-12): (6-10): (1-2).
2. The cross-linked bonding type conductor shielding material as claimed in claim 1, wherein the conductive carbon black is selected from VXC68, #950, Yongdong YD-250C, Zhongjun JE6900, Black cat 3710.
3. The cross-linked bonding type conductor shielding material as claimed in claim 1, wherein the other functional additives include at least a dispersant, an antioxidant and a copper inhibitor.
4. The crosslinked bonding type conductor shielding material according to claim 3, wherein the antioxidant is a combination of antioxidant 300# and antioxidant MD-1024, and the mass ratio of the antioxidant 300# to the antioxidant MD-1024 is (0.2-0.6): (0.1-0.3).
5. The preparation method of the cross-linking bonding type conductor shielding material as claimed in any one of claims 1 to 4, characterized in that the cross-linking bonding type conductor shielding material is prepared by mixing ethylene-vinyl acetate copolymer, conductive carbon black, lubricating composition and other functional additives in parts by weight at the temperature of 140-.
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| CN115627025A (en) * | 2022-11-10 | 2023-01-20 | 南京中超新材料股份有限公司 | Strippable semi-conductive shielding material and preparation method thereof |
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| CN114989524B (en) | 2022-11-08 |
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