CN106280414A - A kind of nylon base heat-conductive composite material and preparation method thereof - Google Patents
A kind of nylon base heat-conductive composite material and preparation method thereof Download PDFInfo
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- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
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Abstract
The present invention provides a kind of nylon base heat-conductive composite material and preparation method thereof.The nylon base heat-conductive composite material that the present invention provides includes following components: 30～60 mass parts nylon 6,5～25 mass parts expanded graphites, 5～20 mass parts auxiliary packings, 1～5 mass parts silane couplers, 0.5～2 mass parts lubricants, 0.2～1 mass parts antioxidant, 1～10 mass parts elastic body toughening agent, 1～20 mass parts fire retardants and 5～15 mass parts glass fibre.The nylon base heat-conductive composite material that the present invention provides has good heat conduction, antistatic, an anti-flaming function, mechanical property and good processability, and with low cost.The preparation method that the present invention provides is easy, practical, it is adaptable to large-scale industrial production.
Description
Technical field
The present invention relates to Heat Conduction Material technical field, particularly to a kind of nylon base heat-conductive composite material and preparation side thereof
Method.
Background technology
Nowadays, along with the development of science and technology, the application of electronic apparatus gradually tends to miniaturization, and uses environment changeable, and this is right
Matched heat sink material performance proposes new requirement, such as lightweight, easy machine-shaping and corrosion-resistant etc., traditional heat conduction material
Expecting to be difficult to meet above-mentioned performance requirement such as metal and ceramic material, therefore, Development of Novel Heat Conduction Material is extremely urgent.
Heat-conducting plastic has low-density, corrosion-resistant, low cost and the characteristic such as easily processed into type due to it, to conventional pilot
The weak point of hot material has carried out preferably supplementing, and at the heat radiation neck of microelectronic packaging material, LED illumination, electronic apparatus
Territory is widely used.Therefore, development heat-conducting plastic meaning heavy is big.
At present, producing of heat-conducting plastic is prepared generally to have the functional stuffing of high thermal conductivity to not possessing heat conductivility
Resin matrix be filled with preparing HEAT-CONDUCTING PLASTICS FILLED WTTH PARTICLES.Typically, there is the filler cost also phase of high thermal conductivity
To higher, such as boron nitride, carborundum, aluminium nitride, CNT, Graphene etc.；And the filler such as oxygen that heat conductivility is relatively low
Changing magnesium, aluminium oxide etc. then needs bigger loading that material just can be made to reach higher heat conductivity, and this can make material
Declining to a great extent occurs in mechanical property.The production and processing mode of heat-conducting plastic is mainly melt-blending process, and this processing mode is simple
Convenient, but the melt flowability of material is had higher requirement.Although the use of a large amount of heat fillings can be at resin matrix
Middle formation more heat conduction network, makes heat conductivity promote, but the reunion of filler also can make the mechanical property of material decline to a great extent
And the rising of material cost.Meanwhile, the use of a large amount of heat fillings can make the mobility of material be deteriorated, the most right
The processability of material adversely affects.
Chinese patent CN103613923A provides a kind of high heat conduction nylon that can require to control according to application electric conductivity
Composite and preparation technology thereof, but this patent relates to the multiple high cost filler such as multi-walled carbon nano-tubes, Graphene, not
It is beneficial to large-scale production；Chinese patent CN105623258A discloses a kind of heat conduction high temperature resistant nylon composite material and preparation side thereof
Method, and employ the fillers such as expanded graphite, but expanded graphite and lappingout graphite powder belong to sheet filler, are being used alone
And loading can make the mechanical property of material and processing fluidity decline to a great extent time bigger, and it is unfavorable for that heavy industrialization is raw
Produce.
Summary of the invention
It is an object of the invention to provide a kind of nylon base heat-conductive composite material and preparation method thereof.The Buddhist nun that the present invention provides
Dragon base heat-conductive composite material has good heat conduction, fire-retardant and anti-static function, mechanical property and good processability, and cost
Cheap.
The invention provides a kind of nylon base heat-conductive composite material, including following components:
Preferably, the particle diameter of described expanded graphite is 20～150 μm.
Preferably, one during described auxiliary packing includes aluminium oxide, magnesium oxide, calcium carbonate, Pulvis Talci and wollastonite or
Multiple.
Preferably, described silane coupler includes N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, γ-(methyl
Acryloyl-oxy) propyl trimethoxy silicane, γ-glycidyl ether oxygen propyl trimethoxy silicane, r-chloropropyl trimethoxyl silane
With one or more in ethyl trimethoxy silane.
Preferably, described lubricant includes liquid paraffin or stearic acid.
Preferably, described antioxidant include three (2,4-di-tert-butyl-phenyl) phosphite ester, four [β-(3,5-di-t-butyls-
4-hydroxy phenyl) propanoic acid] pentaerythritol ester, double (2.4-di-tert-butyl-phenyl) pentaerythritol diphosphites, N, N'-be double-(3-
(3,5-di-tert-butyl-hydroxy phenyl) propiono) double (2,2,6,6-tetramethyl-4-the piperidyl)-1,3-of hexamethylene diamine and N, N'-
One or more in benzenedicarboxamide.
Preferably, described elastic body toughening agent includes olefin block copolymers, ethylene-octene random copolymer, ethylene-vinegar
One or more in acid ethylene copolymer and above-mentioned three kinds of any one grafts.
Preferably, one during described fire retardant includes TDE, brominated Polystyrene and antimony oxide or
Multiple.
Preferably, described glass fiber diameter is 9～13 μm.
Present invention also offers the preparation method of nylon base heat-conductive composite material described in a kind of technique scheme, including with
Lower step:
(1) expanded graphite and auxiliary packing being mixed with silane coupler respectively, surface processes and obtains the swollen of surface modification
Swollen graphite and the auxiliary packing of surface modification；
(2) auxiliary packing of the expanded graphite of the surface modification that described step (1) is obtained and surface modification and nylon 6,
Antioxidant, lubricant, fire retardant, elastic body toughening agent and glass fibre mixing, obtain mixed material；
(3) the mixed material plasticizing extrusion described step (2) obtained, obtains nylon base heat-conductive composite material.
The invention provides a kind of nylon base heat-conductive composite material, including following components: 30～60 mass parts nylon 6,5～
25 mass parts expanded graphites, 5～20 mass parts auxiliary packings, 1～5 mass parts silane couplers, 0.5～2 mass parts lubricants,
0.2～1 mass parts antioxidant, 1～10 mass parts elastic body toughening agent, 1～20 mass parts fire retardants and 5～15 mass parts glass
Fiber.
The nylon base heat-conductive composite material that the present invention provides is using expanded graphite as main heat filling, and expanded graphite is by commonly
Flaky graphite prepares after expanding, with low cost, and it is very big to have laminar structured and specific surface area, filler particles each other it
Between can the most mutually overlap formation network, this can make material be issued to higher heat conduction in relatively low amount of filler
Coefficient also maintains preferable mechanical property；Additionally, the electric conductivity that graphite self has, it is possible to give composite antistatic merit
Energy；Meanwhile, the interpolation of expanded graphite can also improve the fire resistance of composite.
The present invention, by adding auxiliary packing, makes auxiliary packing compound with expanded graphite, is on the one hand conducive to expanded graphite
Sheet layer open, makes resin matrix be more easy to enter the laminar structured interior of expanded graphite, promotes the interface phase interaction between its with matrix
With；On the other hand, the heat conductivity of these auxiliary packings is also above matrix, by the collocation of auxiliary packing Yu expanded graphite,
Intrinsic silicon forms the finest and close and homogeneous heat conduction network, thus promotes heat conduction and the rigidity of material；Meanwhile, auxiliary packing
Use, also can weaken the inhibition that material melt flowing is produced by lamellar expanded graphite, and reduce the one-tenth of material further
This.
The present invention is by adding glass fibre and elastic body toughening agent, it is to avoid due to the addition of a large amount of inorganic rigid particles
And cause the fragility of material to increase, while promoting the strength of materials, give toughness of material so that this material has excellent combining
Close performance.
Test result indicate that, the present invention provide nylon base heat-conductive composite material heat conductivity up to 2.86w/ (m k),
Specific insulation can as little as 4.25 × 103Ω m, vertical combustion rank V-0, hot strength is up to 49.4MPa, and impact strength can
Reach 20.7KJ/m2, by conventional extruder extrusion, and can have good heat conductivity with conventional injector injection moulding
Can, antistatic property, fire resistance, processing characteristics and comprehensive mechanical property.
Detailed description of the invention
The invention provides a kind of nylon base heat-conductive composite material, including following components:
The nylon base heat-conductive composite material that the present invention provides includes 30～60 mass parts nylon 6 (PA6), preferably 35～55
Mass parts, more preferably 40～50 mass parts.The present invention does not has special restriction to the source of described nylon 6, uses this area
Known to commercially available nylon 6.In the present invention, containing a large amount of amido links in the strand of described nylon 6, they can be
PA6 molecule interchain forms hydrogen bond, has bigger strand intermolecular forces, beneficially heat diffusion in resin matrix, makes
Material reaches higher heat conductivity.
The nylon base heat-conductive composite material that the present invention provides includes 5～25 mass parts expanded graphites (EG), preferably 10～
20 mass parts, more preferably 13～17 mass parts.In the present invention, the particle diameter of described expanded graphite is preferably 20～150 μm, more
It is preferably 50～120 μm, most preferably 80～90 μm.The present invention does not has special restriction to the source of described expanded graphite, adopts
With commercially available expanded graphite well known in the art.In the present invention, after described expanded graphite is expanded by common flaky graphite
Prepare, with low cost, and it is very big to have laminar structured and specific surface area, filler particles each other can be at relatively low consumption
Lower mutually overlap joint forms network, makes material be issued to higher heat conductivity in relatively low amount of filler and maintain preferable mechanical property
Energy；The electric conductivity that expanded graphite self has, it is possible to give composite anti-static function；The interpolation of expanded graphite can also carry
The fire resistance of high composite.
The nylon base heat-conductive composite material that the present invention provides includes 5～20 mass parts auxiliary packings, preferably 10～15 matter
Amount part.In the present invention, during described auxiliary packing preferably includes aluminium oxide, magnesium oxide, calcium carbonate, Pulvis Talci and wollastonite
Plant or multiple, more preferably include the one in aluminium oxide, magnesium oxide and calcium carbonate and wollastonite or talcous combination.At this
In bright, described aluminium oxide, magnesium oxide and calcium carbonate are preferably irregular shape；Described Pulvis Talci is preferably lamellar；Described silicon
Lime stone is preferably needle-like or threadiness.In the present invention, described auxiliary packing compounds with expanded graphite, is on the one hand conducive to expanding
Graphite flake layer is opened, and makes resin matrix be more easy to enter the laminar structured interior of expanded graphite, promotes the interface phase between its with matrix
Interaction；On the other hand, the heat conductivity of these auxiliary packings is also above matrix, by taking of auxiliary packing and expanded graphite
Join, form the finest and close and homogeneous heat conduction network at intrinsic silicon, thus promote heat conduction and the rigidity of material；Meanwhile, auxiliary
Help the use of filler, also can weaken the inhibition that material melt flowing is produced by lamellar expanded graphite, and reduce material further
The cost of material.
The nylon base heat-conductive composite material that the present invention provides includes 1～5 mass parts silane couplers, preferably 2～4 mass
Part.The present invention does not has special restriction to the kind of described silane coupler, uses silane well known to those skilled in the art even
Connection agent.In the present invention, described silane coupler include N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, γ-
(methacryloxypropyl) propyl trimethoxy silicane, γ-glycidyl ether oxygen propyl trimethoxy silicane, r-chloropropyl trimethoxyl
One or more in silane and ethyl trimethoxy silane.In the present invention, described silane coupler is by expanded graphite
With the coating modification on auxiliary packing surface, reduce the surface energy of expanded graphite and auxiliary packing, strengthen and the parent of polymeric matrix
And ability.
The nylon base heat-conductive composite material that the present invention provides includes 0.5～2 mass parts lubricants, preferably 1～1.5 mass
Part.The present invention does not has special restriction to the kind of described lubricant, uses lubricant well known to those skilled in the art.
In the present invention, described lubricant preferably includes liquid paraffin or stearic acid.
The nylon base heat-conductive composite material that the present invention provides includes 0.2～1 mass parts antioxidant, preferably 0.5～0.8 matter
Amount part.The present invention does not has special restriction to the kind of described antioxidant, uses antioxidant well known to those skilled in the art i.e.
Can.In the present invention, described antioxidant preferably includes three (2,4-di-tert-butyl-phenyl) phosphite ester, four [β-(3,5-bis-tertiary fourths
Base-4-hydroxy phenyl) propanoic acid] pentaerythritol ester, double (2.4-di-tert-butyl-phenyl) pentaerythritol diphosphites, N, N'-be double-
(3-(3,5-di-tert-butyl-hydroxy phenyl) propiono) hexamethylene diamine and N, N'-double (2,2,6,6-tetramethyl-4-piperidyl)-
One or more in 1,3-benzenedicarboxamide.
The nylon base heat-conductive composite material that the present invention provides includes 1～10 mass parts elastic body toughening agent, preferably 5～7
Mass parts.The present invention does not has special restriction to the kind of described elastic body toughening agent, uses well known to those skilled in the art
Elastomer.In the present invention, described elastic body toughening agent preferably include olefin block copolymers (OBC), ethylene-octene without
One or many in rule copolymer (POE), ethylene-vinyl acetate copolymer (EVA) and above-mentioned three kinds of any one grafts
Kind.In the present invention, described graft is preferably grafted maleic anhydride (MAH) or glycidyl methacrylate (GMA).?
In the present invention, described elastic body toughening agent can be avoided causing the fragility of material to increase due to the addition of a large amount of inorganic rigid particles
Add, give toughness of material so that this material has excellent combination property.
The nylon base heat-conductive composite material that the present invention provides includes 1～20 mass parts fire retardants, preferably 5～15 mass
Part, more preferably 8～12 mass parts.The present invention does not has special restriction to the kind of described fire retardant, uses art technology
Fire retardant known to personnel.In the present invention, described fire retardant preferably include TDE, brominated Polystyrene and
One or more in antimony oxide, more preferably include in TDE and brominated Polystyrene one or both with
The combination of antimony oxide.In the present invention, the one in described fire retardant is TDE and brominated Polystyrene
During combination with antimony oxide, described TDE or brominated Polystyrene are preferably 1 with antimony oxide mass ratio
～3:1.In the present invention, one or both in described fire retardant includes TDE and brominated Polystyrene and three
When aoxidizing the combination of two antimony, the bromine in described TDE and brominated Polystyrene can generate bromine with antimony oxide reaction
Change antimony, catch macromolecular radical, thus terminate combustion reaction.
The nylon base heat-conductive composite material that the present invention provides includes 5～15 mass parts glass fibre, preferably 8～12 mass
Part.The present invention does not has special restriction to the kind of described glass fibre, uses glass fibre well known to those skilled in the art
?.In the present invention, the diameter of described glass fibre is preferably 9～13 μm, more preferably 10～12 μm；Described glass fibre
Chopped length be preferably 3～4.5mm, more preferably 3.5～4mm.In the present invention, on the one hand described glass fibre can carry
High tensile and bending strength, on the other hand jointly act on elastic body toughening agent, can avoid due to a large amount of inorganic rigid grains
The addition of son and cause the fragility of material to increase, promoting imparting toughness of material while the strength of materials so that this material has
Excellent combination property.
Present invention also offers the preparation method of nylon base heat-conductive composite material described in technique scheme, including following step
Rapid:
(1) expanded graphite and auxiliary packing being mixed with silane coupler respectively, surface processes and obtains the swollen of surface modification
Swollen graphite and the auxiliary packing of surface modification；
(2) auxiliary packing of the expanded graphite of the surface modification that described step (1) is obtained and surface modification and nylon 6,
Antioxidant, lubricant, fire retardant, elastic body toughening agent and glass fibre mixing, obtain mixed material；
(3) the mixed material plasticizing extrusion described step (2) obtained, obtains nylon base heat-conductive composite material.
Expanded graphite and auxiliary packing are mixed by the present invention respectively with silane coupler, and surface processes and obtains surface modification
Expanded graphite and the auxiliary packing of surface modification.The present invention does not has special restriction to the operation that described surface processes, and uses this
The technical scheme that inorganic filler surface known to skilled person processes.In the present invention, described silane coupler is excellent
The form with silane coupler ethanol and/or acetone soln is selected to add；Described silane coupler and ethanol and/or the volume of acetone
Ratio preferably 1:100～150.In the present invention, described surface processes and makes coupling agent be coated on expansion stone preferably by stirring
Ink or auxiliary packing surface.In the present invention, described stirring is preferably carried out in high-speed mixer；The speed of described stirring is preferred
It is 500～600rpm；The time of described stirring is preferably 8～15min.In the present invention, described ethanol and/or acetone preferably exist
Stirring is naturally volatilized after terminating and is removed.
For removing remaining ethanol and/or acetone solvent, the present invention is dried the most after surface treatment, obtains surface
Modified expanded graphite and the auxiliary packing of surface modification.The present invention does not has special restriction to described dry operation, uses
Dry technical scheme well known to those skilled in the art.In the present invention, described being dried is preferably drying；Described drying
Temperature be preferably 40～50 DEG C, more preferably 43～46 DEG C；The time of described drying is preferably 0.5～1.5h.
After obtaining the expanded graphite of surface modification and the auxiliary packing of surface modification, described surface is processed and Buddhist nun by the present invention
Dragon 6, antioxidant, lubricant, fire retardant, elastic body toughening agent and glass fibre mixing, obtain mixed material.The present invention is to described
The device of mixing does not has special restriction, uses the device of mixing well known to those skilled in the art.In the present invention, institute
State mixing preferably to carry out in high-speed mixer.In the present invention, described mixing is carried out the most at normal temperatures；The speed of described mixing
Rate is preferably 500～600rpm, more preferably 540～560rpm；The time of described mixing is preferably 5～8min.
For reducing water content, the present invention preferably carries out dried before nylon 6 uses.The present invention is to described dried
Operation there is no special restriction, use the technical scheme of dried well known to those skilled in the art.In the present invention
In, described being dried is preferably vacuum drying；Described vacuum drying vacuum is preferably 0.09～0.1MPa；Described vacuum drying
Temperature be preferably 100～120 DEG C, more preferably 105～110 DEG C；The described vacuum drying time is preferably 8～12h, more excellent
Elect 9～11h as.
After completing described mixing, the mixed material plasticizing extrusion that the present invention will obtain, obtain nylon base heat-conductive composite material.
In the present invention, the temperature of described plasticizing extrusion is preferably 180～260 DEG C, more preferably 200～250 DEG C.The present invention is to described
The device of plasticizing extrusion does not has special restriction, uses plasticizing extrusion device well known to those skilled in the art.At this
In bright, described plasticizing extrusion is preferably carried out in double screw extruder.In the present invention, the screw rod of described double screw extruder turns
Speed is preferably 200～400rpm, more preferably 250～350rpm.
In order to further illustrate the present invention, the nylon base heat-conductive composite material that the present invention provided below in conjunction with embodiment and
Its preparation method is described in detail, but they can not be interpreted as limiting the scope of the present invention.
Embodiment 1:
The silane coupler addition ethanol of 5 mass parts will be dissolved, in advance then with heat filling according to 1:150 volume ratio
Mixing, in high-speed mixer, stirs 15min, until filling surface is by abundant moistening, finally at 50 DEG C with the speed of 500rpm
Under the conditions of dry 1h, obtain the heat filling of surface modification.
Nylon 6 dries 9h in 110 DEG C the most under vacuum.
In parts by mass, by 6,25 parts of expanded graphites of 37 parts of nylon, 20 parts of aluminium oxidies, 5 parts of glass fibre, 10 parts of fire retardants
(brominated Polystyrene: antimony oxide=1:1), 3 parts of POE-g-MAH, 0.4 part of antioxidant and 2 parts of lubricants are in mixed at high speed
Mix homogeneously in machine, by double screw extruder extruding pelletization, extrusion temperature 200～250 DEG C, screw speed 200rpm, obtains
Nylon base heat-conductive composite material.
Made by injection mo(u)lding after the nylon base heat-conductive composite material obtained is dried 8h in 110 DEG C under vacuum
Stretching, the standby test of the required sample of impact property test, injection mo(u)lding temperature is 220～240 DEG C, injection pressure 50MPa.Stretching sample
Product are dumbbell shape batten, overall length 150mm, and intermediate parallel partial-length is 60mm, and width is 10mm, and thickness is 4mm；Non-notch rushes
Hit batten a size of 80 × 10 × 4 (mm)；
Heat conduction sample is then by the hot-forming thin slice being made as 10 × 10 × 1 (mm), and hot pressing temperature is 235 DEG C, hot pressing pressure
Power 50MPa.
The present invention uses laser heat conducting instrument to test the heat conductivity of the nylon base heat-conductive composite material obtained.
Vertical combustion is tested according to UL-94 standard, and sample size is 130mm × 13mm × 3mm, controls flame to examination
Sample lower end effect 10s, the flaming combustion time t of sample after flame removed in record1If sample flame is after removing burning things which may cause a fire disaster
The flaming combustion time t of sample after 30s is interior to be extinguished, then second time applying flame combustion 10s, and flame removed in record respectively2With
Glowing time t3Index.Meanwhile, the absorbent cotton burning producing flame molten drop and causing is seen whether.Each sample requirement
Test 5 samples, then determine sample classification according to result of the test.
The meansigma methods that limited oxygen index LOI test measures 10 standard specimens with reference to ASTM D2836-74 obtains, sample chi
Very little is 100 × 6.5 × 3mm.Sample maintains balance combustion in nitrogen oxygen atmosphere stream, 50mm length of i.e. just burning in 180s
Apart from required oxygen percent by volume.
The nylon base heat-conductive composite material performance that the present embodiment prepares is as shown in table 1.
Embodiment 2:
The silane coupler addition acetone of 2 mass parts will be dissolved, in advance then with heat filling according to 1:130 volume ratio
Mixing, in high-speed mixer, stirs 8min, until filling surface is by abundant moistening, finally at 45 DEG C with the speed of 500rpm
Under the conditions of dry 1h, obtain the heat filling of surface modification.
Nylon 6 dries 10h in 110 DEG C the most under vacuum.
In parts by mass, by 6,10 parts of expanded graphites of 50 parts of nylon, 10 parts of calcium carbonate, 7 parts of glass fibre, 20 parts of fire retardants
(brominated diphenyl methane: antimony oxide=2:1), 3 parts of EVA, 0.5 part of antioxidant and 1.5 parts of lubricants are in high-speed mixer
Mix homogeneously, by double screw extruder extruding pelletization, extrusion temperature 200～250 DEG C, screw speed 300rpm, obtains nylon
Base heat-conductive composite material.
The nylon base heat-conductive composite material prepared the present embodiment according to method of testing described in embodiment 1 carries out performance
Test, result is as shown in table 1.
Embodiment 3:
The silane coupler addition acetone of 1 mass parts will be dissolved, in advance then with heat filling according to 1:110 volume ratio
Mixing, in high-speed mixer, stirs 8min, until filling surface is by abundant moistening, finally at 45 DEG C with the speed of 500rpm
Under the conditions of dry 1h, obtain the heat filling of surface modification.
Nylon 6 dries 12h in 110 DEG C the most under vacuum.
In parts by mass, by 6,10 parts of expanded graphites of 60 parts of nylon, 5 parts of Pulvis Talci, 5 parts of glass fibre, 15 parts of fire retardants
(brominated diphenyl methane: antimony oxide=1:1), 5 parts of OBC-g-GMA, 1 part of antioxidant and 1 part of lubricant are at high-speed mixer
Middle mix homogeneously, by double screw extruder extruding pelletization, extrusion temperature 200～250 DEG C, screw speed 280rpm, obtains Buddhist nun
Dragon base heat-conductive composite material.
The nylon base heat-conductive composite material prepared the present embodiment according to method of testing described in embodiment 1 carries out performance
Test, result is as shown in table 1.
Embodiment 4:
The silane coupler addition ethanol of 4 mass parts will be dissolved, in advance then with heat filling according to 1:140 volume ratio
Mixing, in high-speed mixer, stirs 10min, until filling surface is by abundant moistening, finally at 50 DEG C with the speed of 500rpm
Under the conditions of dry 1h, obtain the heat filling of surface modification.
Nylon 6 dries 12h in 110 DEG C the most under vacuum.
In parts by mass, by 6,15 parts of expanded graphites of 50 parts of nylon, 3 parts of wollastonites, 7 parts of calcium carbonate, 7 parts of glass fibre,
10 parts of fire retardants (brominated Polystyrene: antimony oxide=3:1), 6 parts of POE-g-GMA, 0.8 part of antioxidant and 1 part of lubricant
Mix homogeneously in high-speed mixer, by double screw extruder extruding pelletization, extrusion temperature 200～250 DEG C, screw speed
250rpm, obtains nylon base heat-conductive composite material.
The nylon base heat-conductive composite material prepared the present embodiment according to method of testing described in embodiment 1 carries out performance
Test, result is as shown in table 1.
Embodiment 5:
The silane coupler addition acetone of 4 mass parts will be dissolved, in advance then with heat filling according to 1:150 volume ratio
Mixing, in high-speed mixer, stirs 12min, until filling surface is by abundant moistening, finally at 45 DEG C with the speed of 500rpm
Under the conditions of dry 1h, obtain the heat filling of surface modification.
Nylon 6 dries 12h in 110 DEG C the most under vacuum.
In parts by mass, by 6,15 parts of expanded graphites of 40 parts of nylon, 20 parts of magnesium oxide, 10 parts of glass fibre, 10 parts fire-retardant
Agent (brominated diphenyl methane: antimony oxide=2:1), 10 parts of OBC-g-MAH, 0.4 part of antioxidant and 2 parts of lubricants are the most mixed
Mix homogeneously in conjunction machine, by double screw extruder extruding pelletization, extrusion temperature 200～250 DEG C, screw speed 200rpm, obtains
To nylon base heat-conductive composite material.
The nylon base heat-conductive composite material prepared the present embodiment according to method of testing described in embodiment 1 carries out performance
Test, result is as shown in table 1.
The performance test results of the nylon base heat-conductive composite material that table 1 embodiment of the present invention obtains
As can be seen from the above embodiments, the nylon base heat-conductive composite material that the present invention provides can squeeze with conventional extruder
Go out, with conventional injector injection moulding, there is good heat conductivity, anti-static function, anti-flammability, processing characteristics and resultant force
Learn performance.
It should be pointed out that, for those skilled in the art, under the premise without departing from the principles of the invention,
Can also make some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. a nylon base heat-conductive composite material, including following components:
Nylon base heat-conductive composite material the most according to claim 1, it is characterised in that the particle diameter of described expanded graphite is 20
～150 μm.
Nylon base heat-conductive composite material the most according to claim 1, it is characterised in that described auxiliary packing includes oxidation
One or more in aluminum, magnesium oxide, calcium carbonate, Pulvis Talci and wollastonite.
Nylon base heat-conductive composite material the most according to claim 1, it is characterised in that described silane coupler includes N-
(β-aminoethyl)-γ-aminopropyltrimethoxysilane, γ-(methacryloxypropyl) propyl trimethoxy silicane, γ-shrink are sweet
One or more in oil ether oxygen propyl trimethoxy silicane, r-chloropropyl trimethoxyl silane and ethyl trimethoxy silane.
Nylon base heat-conductive composite material the most according to claim 1, it is characterised in that described lubricant includes liquid paraffin
Or stearic acid.
Nylon base heat-conductive composite material the most according to claim 1, it is characterised in that described antioxidant includes three (2,4-
Di-tert-butyl-phenyl) phosphite ester, four [β-(3,5-di-tert-butyl-hydroxy phenyl) propanoic acid] pentaerythritol ester, double (2.4-bis-
Tert-butyl-phenyl) pentaerythritol diphosphites, N, N'-be double-(3-(3,5-di-tert-butyl-hydroxy phenyl) propiono) oneself two
Amine and N, one or more in double (2,2,6,6-tetramethyl-4-the piperidyl)-1,3-benzenedicarboxamide of N'-.
Nylon base heat-conductive composite material the most according to claim 1, it is characterised in that described elastic body toughening agent includes alkene
Hydrocarbon block copolymer, ethylene-octene random copolymer, ethylene-vinyl acetate copolymer and above-mentioned three kinds of any one grafting
One or more in thing.
Nylon base heat-conductive composite material the most according to claim 1, it is characterised in that described fire retardant includes decabrominated dipheny
One or more in ethane, brominated Polystyrene and antimony oxide.
Nylon base heat-conductive composite material the most according to claim 1, it is characterised in that described glass fiber diameter be 9～
13μm。
10. a preparation method for nylon base heat-conductive composite material described in any one in claim 1～9, including following step
Rapid:
(1) expanded graphite and auxiliary packing being mixed with silane coupler respectively, surface processes the expansion stone obtaining surface modification
Ink and the auxiliary packing of surface modification；
(2) auxiliary packing of the expanded graphite of the surface modification that described step (1) is obtained and surface modification and nylon 6, antioxygen
Agent, lubricant, fire retardant, elastic body toughening agent and glass fibre mixing, obtain mixed material；
(3) the mixed material plasticizing extrusion described step (2) obtained, obtains nylon base heat-conductive composite material.
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