CN110452443A - A kind of Cross-linked Polyethylene Composites and preparation method, application - Google Patents
A kind of Cross-linked Polyethylene Composites and preparation method, application Download PDFInfo
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Abstract
The invention discloses a kind of Cross-linked Polyethylene Composites and preparation method, application, the Cross-linked Polyethylene Composites are using crosslinked polyethylene as matrix, using the mixed fillers of boron nitride microballoon and boron nitride nanosheet as heat conduction particle, constitute three dimentional heat conduction network channel.Invention is based on close-packed principle, utilize the synergistic effect between the spherical boron nitride of micro-meter scale and the thin layer boron nitride piece of nanoscale, passage of heat is constructed in the composite, realize the significantly promotion of heat conductivity, have benefited from the wide energy gaps of boron nitride simultaneously, composite material maintains good insulation characterisitic.The method for preparing composite material in the present invention is easy to operate, at low cost, quality is high, suitable for industrialization large-scale production, the major insulation material obtained that can be used as cable with high thermal conductivity, the Cross-linked Polyethylene Composites of high insulation characterisitic increases substantially service life and the stability of cable operation.
Description
Technical field
The present invention relates to insulating composite material technical fields, and in particular to a kind of Cross-linked Polyethylene Composites and preparation side
Method, application.
Background technique
The good insulation characterisitic of cross-linking polyethylene materials and easy processing characteristic, make it be widely used as leading in power cable
Insulating materials is widely used in power distribution network in recent years.However the lower (< 0.5Wm of the thermal conductivity of crosslinked polyethylene-1·K-1), it is difficult meet the needs of rapid cooling: with the increase of operating load, the presence of the factors such as harmonic wave, three-phase imbalance, crosslinking
PE cable fever phenomenon in During Process of Long-term Operation is more prominent, and prolonged heat concentrates the structure that can destroy material,
Lead to the degeneration of crosslinked polyethylene performance, or even causes cable insulation to puncture and then power transmission failure occurs.Therefore, heat dissipation and
Insulation breakdown problem becomes increasingly conspicuous, and drastically influences efficiency and the service life of insulating materials.
Filler particles such as aluminium nitride (AlN), the silicon carbide (SiC), graphite of high thermal conductivity are added into crosslinked polyethylene matrix
Deng the capacity of heat transmission of crosslinked polyethylene can be significantly improved.However, this method needs higher filer content to be just able to achieve again
Effective promotion of condensation material thermal conductivity, the filler of high concentration can seriously reduce the mechanical property of composite material, electric property and add
Work characteristic.
In recent years, researcher attempted the nanoparticle by introducing high length-diameter ratio, high heat conductance in a polymer matrix
Sub (such as graphene, carbon nanotube etc.) prepares the composite wood with Thermal conductivity to utilize less packing density
Material.Graphene and carbon nanotube form heat conduction network channel easily in composite dielectrics, and then improve its thermal conductivity, but they
High conductance property will lead to being greatly lowered for composite dielectrics dielectric strength.
Summary of the invention
Gained of the invention is designed to provide a kind of Cross-linked Polyethylene Composites, to solve existing twisted polyethylene cable
The low problem of insulating materials thermal conductivity, the Cross-linked Polyethylene Composites have both high thermal conductivity, high insulation characterisitic simultaneously.
In addition, the present invention also provides a kind of above-mentioned preparation methods of Cross-linked Polyethylene Composites, application.
The present invention is achieved through the following technical solutions:
A kind of Cross-linked Polyethylene Composites, using crosslinked polyethylene as matrix, with boron nitride microballoon and boron nitride nanosheet
Mixed fillers be heat conduction particle, constitute three dimentional heat conduction network channel.
Boron nitride nanosheet (BNNS) of the present invention not only possesses and graphene similar structures, while boron nitride nanosheet
Thermal conductivity (~2000Wm with superelevation-1K-1), wide energy gaps (~5.9eV), high thermal stability, high length-diameter ratio and
Low-density is the ideal filler for preparing High-heat-conductiviinsulation insulation material.
The boron nitride microballoon (BNMS) is filled into crosslinked polyethylene, other than improving its thermal conductivity, can also change
Become the electrical property of material, such as increase resistivity, improve insulation characterisitic, increases resistance to electrical tree aging process and local discharge capability, inhibits
Space charge accumulation etc..
Due to the particle that boron nitride nanosheet and boron nitride microballoon are different scale, and between the particle of different scale
Synergistic effect is more advantageous to formation heat conduction network channel in composite material, to significantly improve the thermal conductivity of composite material.
The present invention is filled out using crosslinked polyethylene as the matrix of composite material with the mixing of boron nitride microballoon and boron nitride nanosheet
Material is that heat conduction particle prepares composite material, is based on close-packed principle, utilizes the association between boron nitride microballoon and boron nitride nanosheet
Same-action constructs heat conduction network channel in crosslinked polyethylene, realizes the significantly promotion of heat conductivity.Also, nitrogen
The addition for changing boron microballoon can be improved resistivity, improve insulation characterisitic, while the wide energy level of boron nitride microballoon and boron nitride nanometer
Gap is more advantageous to the insulation characterisitic for keeping composite material.
Further, the mass ratio of boron nitride microballoon and boron nitride nanosheet is 0.5~2.0:1 in mixed fillers.
The packing density of high-content is needed when the biggish boron nitride microspheres amount of volume is lower based on close-packed principle
Effective passage of heat could be formed, when boron nitride microspheres amount is higher, when larger due to the gap between ball and ball, also not
It is able to satisfy effective foundation of passage of heat, applicant, which obtains above-mentioned mass ratio by test, can establish passage of heat.
Further, the diameter of boron nitride microballoon is 50~100 μm, and the partial size of the boron nitride nanosheet is 5~10 μm,
Thickness is less than 5nm.
In the application, boron nitride microballoon is commercially available gained, and boron nitride nanosheet is experiment removing gained.Above-mentioned partial size
The mass ratio that cooperation boron nitride microballoon and boron nitride nanosheet is arranged can establish passage of heat, specifically, nitridation of the invention
The partial size of boron nanometer sheet is big, and major diameter is bigger, is conducive to building passage of heat, the thermal conductivity of composite material is caused to significantly improve,
Draw ratio refers to the out to out of particle and the ratio of smallest dimension, and more bigger passage of heat more easy to form, raising are multiple for draw ratio
The thermal conductivity of condensation material.
Further, the mass percent of heat conduction particle and matrix are as follows: 14.5%~35.9%:85.5%~64.1%.
Heat conduction particle content is too low to be not enough to be formed passage of heat in a polymer matrix, therefore gained heat conductivity
It is lower；Heat conduction particle content is too high, will affect the processing characteristics and mechanical property of composite material.Applicant is found by experiment that:
When the concentration of heat conduction particle is 14.5%~35.9%, the thermal conductivity promotion that can both meet composite material can also keep polymer
Good processing characteristics.
Further, crosslinked polyethylene is low density polyethylene (LDPE), the density of the low density polyethylene (LDPE) is 0.914~
0.922g/m3, molecular weight is 153500~162100.
The present invention selects conventional commercial low-density polyethylene.
A kind of preparation method of Cross-linked Polyethylene Composites, comprising the following steps:
1) it, prepares boron nitride nanosheet: hexagonal boron nitride is prepared into boron nitride nanosheet by liquid phase ultrasound removing, it is described
The partial size of hexagonal boron nitride is 5~10 μm；
2), performed polymer is blended: in 109~115 DEG C of melt blendings after crosslinked polyethylene and heat conduction particle are mixed, being led
Blending pre-polymerization nanocrystal composition of the hot even particulate dispersion in crosslinked polyethylene；
3), performed polymer is blended with crosslinking agent: pre-polymerization nanocrystal composition and cumyl peroxide will be blended at 112~118 DEG C
Melt blending obtains tertiary blending compound；
4), hot-forming: to use vulcanizing press by tertiary blending compound under conditions of 15Mpa, 113~118 DEG C
It is hot-forming, it is prepared into sample；
5), vulcanization crosslinking: sample is crosslinked under 173~178 DEG C, 15MPa by 30-45min using vulcanizing press, is obtained
Cross-linked Polyethylene Composites.
The thickness of boron nitride nanosheet after being removed by liquid phase ultrasound is compared with hexagonal boron nitride, hence it is evident that reduces.
The thermal conductivity of the composite material of the method preparation is all larger than 2.2W/mK through the invention, while remaining very
Good insulation characterisitic (breakdown strength > 36kV/mm, volume resistivity > 1015Ω·m)。
The method for preparing composite material in the present invention is easy to operate, at low cost, quality is high, and it is extensive raw to be suitable for industrialization
It produces.
Further, detailed process is as follows for the removing of liquid phase ultrasound:
Hexagonal boron nitride is added in isopropanol by a certain percentage, gained mixed solution ultrasound 8~12 hours in ice bath,
Then ultrasonic acquired solution is removed into unstripped hexagonal boron nitride by low-speed centrifugal, institute then will be removed using high speed centrifugation
Boron nitride nanosheet is obtained to be collected and be dried in vacuo.
Further, the ratio of hexagonal boron nitride and isopropanol is that 1g hexagonal boron nitride is added in every 100ml isopropanol, is surpassed
Acoustical power is 300~350W, and low-speed centrifugal revolving speed is 800~1200rpm, and high speed centrifugation revolving speed is 4500~5000rpm, vacuum
Dry temperature is 25 DEG C, and the time is 48~60 hours.
It is found by the applicant that the effect of isopropanol and hexagonal boron nitride is stronger, therefore, select isopropanol as hexagonal boron nitride
Remover dispersion removing is carried out to it.The power of 300~350W of selection carries out ultrasonic reason and is: the too high meeting pair of ultrasonic power
Hexagonal boron nitride structure damages, and is unfavorable for keeping its good hexagoinal lattice and high thermal conductivity characteristic, and power is too low can shadow
The peeling effect for ringing hexagonal boron nitride is unfavorable for obtaining thin layer boron nitride nanosheet.We have found that in 300~350W ultrasonic liquid-phase
Peeling effect is best.For low-speed centrifugal mainly for removing unstripped hexagonal boron nitride, high speed centrifugation is to collect and separate
The thin layer boron nitride nanosheet come.Since the draw ratio of boron nitride nanosheet is very big, high temperature drying is easy to reunite, therefore selects
25 DEG C of room temperature are dried in vacuo.
Further, by the Cross-linked Polyethylene Composites of preparation in vacuum drying oven, 82-85 DEG C of heat treatment disappears for 48 hours
Except by-product.
A kind of application of Cross-linked Polyethylene Composites, the Cross-linked Polyethylene Composites are applied to cable.
High thermal conductivity provided by the invention, the Cross-linked Polyethylene Composites of high insulation characterisitic can be widely applied to electric power electricity
The major insulation of cable, and the stability and reliability of cable operation are increased substantially, extend the service life of cable.
Compared with prior art, the present invention having the following advantages and benefits:
1, Cross-linked Polyethylene Composites of the present invention, it is provided by the invention multiple compared with existing crosslinked polyethylene
The thermal conductivity of condensation material significantly improves, while having good insulation characterisitic.
2, the method for preparing composite material in the present invention is easy to operate, at low cost, quality is high, and it is extensive to be suitable for industrialization
Production.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is the scanning electron microscope diagram of hexagonal boron nitride；
Fig. 2 is the scanning electron microscope diagram of boron nitride nanosheet；
Fig. 3 is the transmission electron microscope figure of hexagonal boron nitride；
Fig. 4 is the transmission electron microscope figure of boron nitride nanosheet；
Fig. 5 is the scanning electron microscope diagram of boron nitride microballoon；
Fig. 6 is the thermal conductivity of composite material in example 1-5；
Fig. 7 is the thermal conductivity of composite material in example 4,6,7；
Fig. 8 is the thermal conductivity of composite material in example 2 and example 8；
Fig. 9 is the thermal conductivity of composite material in example 1,9,10；
Figure 10 is the thermal conductivity of composite material in different comparative examples；
Figure 11 is the volume resistivity of composite material in different instances；
Figure 12 is the breakdown strength of composite material in different instances.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to embodiment and attached drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation for explaining only the invention, are not made
For limitation of the invention.
Embodiment 1:
A kind of Cross-linked Polyethylene Composites, using crosslinked polyethylene as matrix, with boron nitride microballoon and boron nitride nanosheet
Mixed fillers be heat conduction particle, constitute three dimentional heat conduction network channel, the mass ratio of described matrix and heat conduction particle is 85.5:
14.5, the crosslinked polyethylene is low density polyethylene (LDPE), and the density of the low density polyethylene (LDPE) is 0.914g/m3, molecular weight is
153500；The mass ratio of the low density polyethylene (LDPE), boron nitride microballoon and boron nitride nanosheet is 85.5:4.83:9.67, described
60 μm of the diameter of boron nitride microballoon, the partial size of the boron nitride nanosheet are 5~10 μm, with a thickness of 10nm is less than.
The preparation method of above-mentioned Cross-linked Polyethylene Composites, comprising the following steps:
1) it, prepares boron nitride nanosheet: hexagonal boron nitride being added in isopropanol by a certain percentage, gained mixed solution exists
Ultrasound 8 hours, are then removed unstripped hexagonal boron nitride by low-speed centrifugal for ultrasonic acquired solution, then used in ice bath
High speed centrifugation will remove gained boron nitride nanosheet and be collected and be dried in vacuo, the ratio of the hexagonal boron nitride and isopropanol
For in every 100ml isopropanol be added 1g hexagonal boron nitride, ultrasonic power 300W, low-speed centrifugal revolving speed be 800rpm, at a high speed from
Heart revolving speed is 4500rpm, and vacuum drying temperature is 25 DEG C, and the time is 48 hours, and the partial size of the hexagonal boron nitride is 5~10
μm；
2), performed polymer is blended: in 109 DEG C of melt blendings after crosslinked polyethylene and heat conduction particle are mixed, obtaining thermally conductive
Grain is dispersed in the blending pre-polymerization nanocrystal composition in crosslinked polyethylene；
3), performed polymer is blended with crosslinking agent: it is total in 112 DEG C of meltings that pre-polymerization nanocrystal composition and cumyl peroxide will be blended
It is mixed, obtain tertiary blending compound；
4), hot-forming: to be hot pressed into tertiary blending compound under conditions of 15Mpa, 113 DEG C using vulcanizing press
Type is prepared into sample；
5), vulcanization crosslinking: sample is crosslinked under 173 DEG C, 15MPa by 30min using vulcanizing press, obtains being crosslinked poly- second
Alkene composite material；
6), by the Cross-linked Polyethylene Composites of preparation in vacuum drying oven, 82 DEG C of heat treatment, 48 hours elimination by-products.
By h-BN, BNNS, BNMS carry out morphology characterization, as a result as shown in attached drawing 1-5.
Embodiment 2:
The present embodiment be based on embodiment 1, the difference from embodiment 1 is that: the low density polyethylene (LDPE), boron nitride microballoon with
The mass ratio of boron nitride nanosheet is 80:6.67:13.33.
Embodiment 3:
The present embodiment be based on embodiment 1, the difference from embodiment 1 is that: the low density polyethylene (LDPE), boron nitride microballoon with
The mass ratio of boron nitride nanosheet is 75:8.33:16.67.
Embodiment 4:
The present embodiment be based on embodiment 1, the difference from embodiment 1 is that: the low density polyethylene (LDPE), boron nitride microballoon with
The mass ratio of boron nitride nanosheet is 70:10:20.
Embodiment 5:
The present embodiment be based on embodiment 1, the difference from embodiment 1 is that: the low density polyethylene (LDPE), boron nitride microballoon with
The mass ratio of boron nitride nanosheet is 65:11.7:23.3.
Embodiment 6:
The present embodiment be based on embodiment 1, the difference from embodiment 1 is that: the low density polyethylene (LDPE), boron nitride microballoon with
The mass ratio of boron nitride nanosheet is 70:15:15.
Embodiment 7:
The present embodiment be based on embodiment 1, the difference from embodiment 1 is that: the low density polyethylene (LDPE), boron nitride microballoon with
The mass ratio of boron nitride nanosheet is 70:20:10.
Embodiment 8:
The present embodiment be based on embodiment 1, the difference from embodiment 1 is that: the low density polyethylene (LDPE), boron nitride microballoon with
The mass ratio of boron nitride nanosheet is 80:6.67:13.33, and the density of the low density polyethylene (LDPE) is 0.922g/m3, molecular weight
It is 162100, the diameter of the boron nitride microballoon is 60 μm, and the partial size of the boron nitride nanosheet is 5~10 μm, and thickness is greater than
30nm。
The preparation method of above-mentioned Cross-linked Polyethylene Composites, comprising the following steps:
1) it, prepares boron nitride nanosheet: hexagonal boron nitride being added in isopropanol by a certain percentage, gained mixed solution exists
Ultrasound 12 hours, are then removed unstripped hexagonal boron nitride by low-speed centrifugal for ultrasonic acquired solution, then adopted in ice bath
Gained boron nitride nanosheet will be removed with high speed centrifugation to be collected and be dried in vacuo, the ratio of the hexagonal boron nitride and isopropanol
Example is that 1g hexagonal boron nitride is added in every 100ml isopropanol, ultrasonic power 350W, and low-speed centrifugal revolving speed is 1200rpm, high speed
Centrifugal rotational speed is 5000rpm, and vacuum drying temperature is 25 DEG C, and the time is 60 hours, the partial size of the hexagonal boron nitride is 5~
10μm；
2), performed polymer is blended: in 115 DEG C of melt blendings after crosslinked polyethylene and heat conduction particle are mixed, obtaining thermally conductive
Grain is dispersed in the blending pre-polymerization nanocrystal composition in crosslinked polyethylene；
3), performed polymer is blended with crosslinking agent: it is total in 118 DEG C of meltings that pre-polymerization nanocrystal composition and cumyl peroxide will be blended
It is mixed, obtain tertiary blending compound；
4), hot-forming: to be hot pressed into tertiary blending compound under conditions of 15Mpa, 118 DEG C using vulcanizing press
Type is prepared into sample；
5), vulcanization crosslinking: sample is crosslinked under 178 DEG C, 15MPa by 45min using vulcanizing press, obtains being crosslinked poly- second
Alkene composite material；
6), by the Cross-linked Polyethylene Composites of preparation in vacuum drying oven, 85 DEG C of heat treatment, 48 hours elimination by-products.
Embodiment 9:
The present embodiment is based on embodiment 1, the difference from embodiment 1 is that: the diameter of boron nitride microballoon is 80 μm, the nitrogen
The partial size for changing boron nanometer sheet is 0.5~2 μm, and thickness is less than 10nm.
Embodiment 10:
The present embodiment is based on embodiment 1, the difference from embodiment 1 is that: the diameter of boron nitride microballoon is 100 μm, described
The partial size of boron nitride nanosheet is 0.5~2 μm, and thickness is less than 10nm.
Comparative example 1:
This comparative example be based on embodiment 1, the difference from embodiment 1 is that: the low density polyethylene (LDPE), boron nitride microballoon with
The mass ratio of boron nitride nanosheet is 94:2:4.
Comparative example 2:
This comparative example be based on embodiment 1, the difference from embodiment 1 is that: the low density polyethylene (LDPE), boron nitride microballoon with
The mass ratio of boron nitride nanosheet is 40:20:40.
Comparative example 3:
This comparative example be based on embodiment 1, the difference from embodiment 1 is that: the low density polyethylene (LDPE), boron nitride microballoon with
The mass ratio of boron nitride nanosheet is 80:20:0.
Comparative example 4:
This comparative example be based on embodiment 1, the difference from embodiment 1 is that: the low density polyethylene (LDPE), boron nitride microballoon with
The mass ratio of boron nitride nanosheet is 80:0:20.
Comparative example 5:
This comparative example be based on embodiment 1, the difference from embodiment 1 is that: the low density polyethylene (LDPE), boron nitride microballoon with
The mass ratio of boron nitride nanosheet is 80:2:18.
Comparative example 6:
This comparative example be based on embodiment 1, the difference from embodiment 1 is that: the low density polyethylene (LDPE), boron nitride microballoon with
The mass ratio of boron nitride nanosheet is 80:18:2.
Comparative example 7:
This comparative example is based on embodiment 1, the difference from embodiment 1 is that: the diameter of boron nitride microballoon is 60um, the nitrogen
The partial size for changing boron nanometer sheet is 30um, and thickness is greater than 30nm.
Comparative example 8:
This comparative example is based on embodiment 1, the difference from embodiment 1 is that: the diameter of boron nitride microballoon is 60um, the nitrogen
The partial size for changing boron nanometer sheet is 20um, with a thickness of 30nm is greater than.
Composite material prepared by embodiment 1- embodiment 10, comparative example 1- comparative example 8, is made by test request with one
Determine the sample of thickness, carries out the test of thermal conductivity, breakdown strength and volume resistivity, test result such as figure attached drawing 6- attached drawing 12
It is shown.
With reference to the accompanying drawings-attached drawing 9 it follows that
1, the thermal conductivity of the composite material prepared by the present invention is all larger than 1.2W/mK, while remaining good insulation
Characteristic (breakdown strength > 36kV/mm, volume resistivity > 1015Ω·m).Wherein, the matter of boron nitride microballoon and boron nitride nanosheet
Amount is than in range of the present invention, the thermal conductivity of composite material is with the mass ratio of boron nitride microballoon and boron nitride nanosheet
Increasing is in the trend (being embodied by the data of Fig. 6, Fig. 7) for first increasing and reducing afterwards, wherein when the low density polyethylene (LDPE), boron nitride
The mass ratio of microballoon and boron nitride nanosheet be 70:10:20 (by attached drawing 6 data embody), the boron nitride microballoon it is straight
Diameter is 60 μm, and the partial size of the boron nitride nanosheet is 5~10 μm, and effect is best (by implementing in attached drawing 9 when thickness is less than 10nm
The data comparison of example 1, embodiment 9 and embodiment 10 embodies).When packing density continues growing, since viscosity increase leads to hole
Gap generates, the reduced performance of gained composite material.
2, when filling single boron nitride microballoon or boron nitride nanosheet, the thermal conductivity of composite material is significantly lower than identical
The composite material of the hybrid particulates of content, mainly one-component cannot be effectively formed passage of heat.
3, when the mass ratio of low density polyethylene (LDPE), boron nitride microballoon and boron nitride nanosheet is not in range of the present invention
When, the thermal conductivity of composite material is substantially reduced, although hybrid particulates a degree of can cooperatively form passage of heat, efficiency
Lower than hybrid particulates in invention.
4, it when the partial size of boron nitride nanosheet and thickness is not in range of the present invention, can not effectively form close
Accumulation promotes deficiency so as to cause the thermal conductivity of composite material.
5, when the thickness of boron nitride nanosheet is higher than the present invention, the thermal conductivity of composite material is substantially reduced, and boron nitride is received
Piece is thicker is more difficult to disperse for rice, and the thermal conductivity of composite material is caused to reduce.(by the data of embodiment 2 and embodiment 8)
6, when the draw ratio of boron nitride nanosheet is too small, it is unfavorable for constructing passage of heat, leads to the thermal conductivity of composite material
It is substantially reduced, draw ratio refers to that the bigger the out to out of particle and the ratio of smallest dimension, draw ratio the more easy to form thermally conductive logical
Road, the boron nitride nanosheet partial size improved in the thermal conductivity of composite material, such as embodiment 9 and embodiment 10 is small, therefore major diameter
Than reducing, thermal conductivity is relatively low.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (10)
1. a kind of Cross-linked Polyethylene Composites, which is characterized in that using crosslinked polyethylene as matrix, with boron nitride microballoon and nitridation
The mixed fillers of boron nanometer sheet are heat conduction particle, constitute three dimentional heat conduction network channel.
2. a kind of Cross-linked Polyethylene Composites according to claim 1, which is characterized in that nitrogenized in the mixed fillers
The mass ratio of boron microballoon and boron nitride nanosheet is 0.5~2.0:1.
3. a kind of Cross-linked Polyethylene Composites according to claim 1, which is characterized in that the boron nitride microballoon it is straight
Diameter is 50~100 μm, and the partial size of the boron nitride nanosheet is 5~10 μm, and thickness is less than 5nm.
4. a kind of Cross-linked Polyethylene Composites according to claim 1, which is characterized in that the heat conduction particle and matrix
Mass percent are as follows: 14.5%~35.9%:85.5%~64.1%.
5. a kind of Cross-linked Polyethylene Composites according to claim 1, which is characterized in that the crosslinked polyethylene is low
Density polyethylene, the density of the low density polyethylene (LDPE) are 0.914~0.922g/m3, molecular weight is 153500~162100.
6. a kind of preparation method of the Cross-linked Polyethylene Composites as described in claim any one of 1-5, which is characterized in that including
Following steps:
1) it, prepares boron nitride nanosheet: hexagonal boron nitride is prepared into boron nitride nanosheet, six side by liquid phase ultrasound removing
The partial size of boron nitride is 5~10 μm；
2), performed polymer is blended: in 109~115 DEG C of melt blendings after crosslinked polyethylene and heat conduction particle are mixed, obtaining thermally conductive
Grain is dispersed in the blending pre-polymerization nanocrystal composition in crosslinked polyethylene；
3), performed polymer is blended with crosslinking agent: pre-polymerization nanocrystal composition and cumyl peroxide will be blended and melt at 112~118 DEG C
It is blended, obtains tertiary blending compound；
4), hot-forming: to use vulcanizing press by the hot pressing under conditions of 15Mpa, 113~118 DEG C of tertiary blending compound
Molding, is prepared into sample；
5), vulcanization crosslinking: sample is crosslinked under 173~178 DEG C, 15MPa by 30-45min using vulcanizing press, is crosslinked
Composite polyethylene material.
7. the preparation method of Cross-linked Polyethylene Composites according to claim 6, which is characterized in that the removing of liquid phase ultrasound
Detailed process is as follows:
Hexagonal boron nitride is added in isopropanol by a certain percentage, gained mixed solution ultrasound 8~12 hours in ice bath, then
Ultrasonic acquired solution is removed into unstripped hexagonal boron nitride by low-speed centrifugal, gained nitrogen then will be removed using high speed centrifugation
Change boron nanometer sheet to be collected and be dried in vacuo.
8. the preparation method of Cross-linked Polyethylene Composites according to claim 7, which is characterized in that the six sides nitridation
The ratio of boron and isopropanol be every 100ml isopropanol in be added 1g hexagonal boron nitride, ultrasonic power be 300~350W, low speed from
Heart revolving speed is 800~1200rpm, and high speed centrifugation revolving speed is 4500~5000rpm, and vacuum drying temperature is 25 DEG C, and the time is
48~60 hours.
9. the preparation method of Cross-linked Polyethylene Composites according to claim 6, which is characterized in that by the crosslinking of preparation
Composite polyethylene material is in vacuum drying oven, 48 hours elimination by-products of 82-85 DEG C of heat treatment.
10. a kind of application of the Cross-linked Polyethylene Composites as described in claim any one of 1-5, which is characterized in that the friendship
Join composite polyethylene material and is applied to cable.
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