CN112029275A - Heat-conducting nylon material and preparation method and application thereof - Google Patents
Heat-conducting nylon material and preparation method and application thereof Download PDFInfo
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- CN112029275A CN112029275A CN202010961949.3A CN202010961949A CN112029275A CN 112029275 A CN112029275 A CN 112029275A CN 202010961949 A CN202010961949 A CN 202010961949A CN 112029275 A CN112029275 A CN 112029275A
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- 239000004677 Nylon Substances 0.000 title claims abstract description 106
- 229920001778 nylon Polymers 0.000 title claims abstract description 106
- 239000000463 material Substances 0.000 title claims abstract description 91
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 229920002292 Nylon 6 Polymers 0.000 claims abstract description 31
- 239000003365 glass fiber Substances 0.000 claims abstract description 28
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229920000299 Nylon 12 Polymers 0.000 claims abstract description 26
- 239000000945 filler Substances 0.000 claims abstract description 23
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims description 17
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 14
- 239000011231 conductive filler Substances 0.000 claims description 7
- 239000004408 titanium dioxide Substances 0.000 claims description 7
- 239000006057 Non-nutritive feed additive Substances 0.000 claims description 6
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 6
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 5
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 4
- 239000011257 shell material Substances 0.000 claims description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 4
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 4
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 3
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 3
- 239000000347 magnesium hydroxide Substances 0.000 claims description 3
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
- AKJVMGQSGCSQBU-UHFFFAOYSA-N zinc azanidylidenezinc Chemical compound [Zn++].[N-]=[Zn].[N-]=[Zn] AKJVMGQSGCSQBU-UHFFFAOYSA-N 0.000 claims description 3
- 239000011787 zinc oxide Substances 0.000 claims description 3
- 229910052582 BN Inorganic materials 0.000 claims description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- -1 age resistors Substances 0.000 claims description 2
- 239000003063 flame retardant Substances 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- 239000004611 light stabiliser Substances 0.000 claims description 2
- 239000000314 lubricant Substances 0.000 claims description 2
- 239000012756 surface treatment agent Substances 0.000 claims description 2
- 238000005452 bending Methods 0.000 abstract description 9
- 229920000642 polymer Polymers 0.000 abstract description 7
- 238000012545 processing Methods 0.000 abstract description 5
- 239000011248 coating agent Substances 0.000 abstract description 3
- 238000000576 coating method Methods 0.000 abstract description 3
- 239000004020 conductor Substances 0.000 abstract description 3
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- 230000000052 comparative effect Effects 0.000 description 14
- 239000000203 mixture Substances 0.000 description 12
- 238000003756 stirring Methods 0.000 description 9
- 239000004033 plastic Substances 0.000 description 6
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- 238000011161 development Methods 0.000 description 5
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- 238000012360 testing method Methods 0.000 description 4
- 239000012745 toughening agent Substances 0.000 description 4
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- 239000006085 branching agent Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 239000004970 Chain extender Substances 0.000 description 2
- 239000004687 Nylon copolymer Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- 239000002994 raw material Substances 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 229920007019 PC/ABS Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 238000012356 Product development Methods 0.000 description 1
- 241000519995 Stachys sylvatica Species 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
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- 229910045601 alloy Inorganic materials 0.000 description 1
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- 238000005253 cladding Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
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- 238000001746 injection moulding Methods 0.000 description 1
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- 229920002647 polyamide Polymers 0.000 description 1
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- 239000004065 semiconductor Substances 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
- C08L77/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/04—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polycarbonamides, polyesteramides or polyimides
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/08—Materials not undergoing a change of physical state when used
- C09K5/14—Solid materials, e.g. powdery or granular
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/28—Nitrogen-containing compounds
- C08K2003/282—Binary compounds of nitrogen with aluminium
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
Abstract
The invention provides a heat-conducting nylon material and a preparation method and application thereof, wherein the heat-conducting nylon material comprises the following components in parts by weight: 30-40 parts of nylon, 20-25 parts of glass fiber, 5-10 parts of maleic anhydride and 30-40 parts of heat-conducting filler; the nylon is the combination of branched nylon 6 and nylon 12, so that the crystallinity of the polymer can be effectively reduced, the dispersion of glass fibers and heat-conducting fillers is facilitated, and the processing performance is improved; meanwhile, the coating property of the material can be improved, so that a more stable cross-linked network structure is formed inside the heat-conducting nylon material, and the bending property, the toughness and the impact strength are further improved. The heat-conducting nylon material has good balance in comprehensive performances such as heat conductivity, mechanical strength and flexibility by mutual matching of nylon, glass fiber, maleic anhydride and heat-conducting filler, and can fully meet the performance requirements of electronic products such as 5G routing and the like on polymer heat-conducting materials.
Description
Technical Field
The invention belongs to the technical field of polymer materials, and relates to a heat-conducting nylon material, and a preparation method and application thereof.
Background
The continuous development of material science enables the application proportion of the heat conduction materials in national defense industry and civil materials to be increased year by year, the heat conduction materials with the characteristics of light weight, good mechanical property, strong electrical insulation, low price and the like become the trend of future development, and the heat conduction materials have wide application prospects in the rapid development of the electronic industry today. Electronic industrial products such as 5G routing, 3C electronic products, AI robots, sweeping robots, projectors, small base stations and semiconductor devices are continuously developing towards miniaturization, lightness and thinness and intellectualization, all of these products need higher heat dissipation, electronic components are rapidly developing towards miniaturization and multifunctionalization, component assembly density is higher and higher, unit heat productivity is rapidly increased, and electronic industry needs materials with high thermal conductivity and high strength physical properties, so people put forward higher requirements on the thermal conductivity of the materials. The traditional heat conducting component material comprises PC or PC/ABS alloy, the toughness and the aging resistance of the traditional heat conducting component material are good, but the heat conducting property is not ideal, and the heat dissipation requirement of electronic products for miniaturization development is difficult to meet. The material with relatively good heat conductivity does not have high hardness and toughness, and cannot meet the comprehensive requirements of heat dissipation and mechanical properties of the existing electronic products and industrial product development, so that the preparation of the high-performance heat-conducting shell material becomes a problem to be solved urgently.
CN102757640A discloses a heat-conducting nylon composite material and a preparation method thereof, wherein the heat-conducting nylon composite material comprises: 20-60% of nylon, 3-10% of compatilizer, 5-10% of high-thermal-conductivity fiber, 30-50% of high-thermal-conductivity filler and 0.5-16% of auxiliary agent; the heat-conducting nylon composite material realizes the effect that the material is slightly crosslinked in the modification process and is deeply crosslinked in the later injection molding processing process by controlling the adding proportion of the branching agent and the chain extender, so that the material can be directly converted into a thermosetting product from a thermoplastic material, the physical and mechanical properties of the product are greatly improved, the problem that the physical properties of the material are greatly influenced due to the high filling amount of a heat-conducting component is solved, and the heat conductivity and the toughness of the material are still to be improved.
CN105419315A provides a high glass fiber content reinforced nylon 6 material, which comprises the following components by mass percent: 55-70% of glass fiber, 616-38% of nylon, 5-10% of nylon copolymer, 1-2% of lubricating additive, 0.05-1% of star-shaped branching agent, 0.05-1% of end-capping agent and 0.05-1% of heat stabilizer, wherein the nylon 6 and the nylon copolymer are selected as main materials, the star-shaped branching agent is added, the raw materials are cheap and easy to obtain, the white spots and the glass fibers are not exposed, the product has excellent comprehensive performance, high mechanical strength, long-term heat resistance, dimensional stability and high rigidity, but the product does not disclose good heat-conducting performance.
CN106916443A discloses a heat-conductive nylon plastic and a method for preparing the same, wherein the raw materials of the heat-conductive nylon plastic comprise nylon resin and a toughening agent; wherein, the toughening agent comprises polyamide elastomer and polyolefin elastomer and is used for increasing the toughness of the heat-conducting nylon plastic. However, the heat conductive nylon plastic has poor impact resistance, and as the content of the heat conductive filler in the plastic increases, the mechanical properties of the plastic decrease rapidly, and it is difficult to achieve both heat conductivity and mechanical strength.
Therefore, the development of a nylon material having high thermal conductivity, high toughness and high impact strength is an important research point in the art.
Disclosure of Invention
The invention aims to provide a heat-conducting nylon material, a preparation method and an application thereof, wherein the heat-conducting nylon material is endowed with excellent toughness, mechanical strength and heat-conducting property through the mutual matching of nylon, glass fiber, maleic anhydride and heat-conducting filler; the branched nylon 6 and the nylon 12 are combined, so that the mechanical property and the cladding property of the heat-conducting nylon material are improved, the dispersibility of the glass fiber and the heat-conducting filler in a polymer matrix is effectively improved, the processability and the application performance of the material are comprehensively improved, and the use requirement of the high-performance heat-conducting material can be met.
In order to achieve the purpose, the invention adopts the following technical scheme:
one purpose of the invention is to provide a heat-conducting nylon material, which comprises the following components in parts by weight:
the nylon is a combination of branched nylon 6 and nylon 12.
In the invention, the nylon material consisting of nylon, glass fiber, maleic anhydride and heat-conducting filler has excellent toughness, strength and heat-conducting property; the nylon adopts the combination of branched nylon 6 and nylon 12, so that on one hand, the crystallinity of a polymer can be reduced, the fluidity of a nylon matrix is improved, the dispersion of glass fibers and heat-conducting fillers is facilitated, and the processing performance is improved; on the other hand, the physical property of the nylon material can be improved, so that the nylon material has stronger coating property, has better matching effect with maleic anhydride, can form a more stable cross-linked network structure after reaction, and has high bending property, toughness and impact strength. The nylon heat conduction material provided by the invention has the advantages that the heat conduction filler has a high proportion, the formed high-density heat conduction channel is beneficial to heat conduction and dissipation, and meanwhile, the nylon heat conduction material has high mechanical property and good flame retardance and can fully meet the application requirements of polymer materials in electronic products.
In the present invention, the amount of nylon added may be 30 parts by weight, 31 parts by weight, 32 parts by weight, 33 parts by weight, 34 parts by weight, 35 parts by weight, 36 parts by weight, 37 parts by weight, 38 parts by weight, 39 parts by weight, 40 parts by weight, or the like.
In the present invention, the addition amount of the glass fiber may be 20 parts by weight, 21 parts by weight, 22 parts by weight, 23 parts by weight, 24 parts by weight, 25 parts by weight, or the like.
In the present invention, the addition amount of maleic anhydride may be 2 parts by weight, 3 parts by weight, 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, or the like.
In the present invention, the addition amount of the heat conductive filler may be 30 parts by weight, 31 parts by weight, 32 parts by weight, 33 parts by weight, 34 parts by weight, 35 parts by weight, 36 parts by weight, 37 parts by weight, 38 parts by weight, 39 parts by weight, 40 parts by weight, or the like.
In the present invention, the mass ratio of the branched nylon 6 to the nylon 12 is (1.5 to 4):1, for example, 1.6:1, 1.8:1, 2:1, 2.2:1, 2.4:1, 2.6:1, 2.8:1, 3:1, 3.2:1, 3.4:1, 3.6:1, 3.8:1, or 3.9: 1.
Preferably, the branched nylon 6 has a relative viscosity of 3.0 to 4.0, such as 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, or 3.9, and the like.
In the present invention, the diameter of the glass fiber is 5 to 35 μm, for example, 6 μm, 8 μm, 10 μm, 12 μm, 15 μm, 18 μm, 20 μm, 22 μm, 25 μm, 28 μm, 30 μm, 32 μm, or 34 μm.
In the invention, the glass fiber is alkali-free chopped glass fiber.
Preferably, the glass fiber is a surface-treated glass fiber.
Preferably, the surface treatment agent comprises a silane coupling agent.
In the present invention, the mass of the maleic anhydride is 10 to 25%, for example, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, or the like, preferably 12 to 20%, based on 100% by mass of the nylon.
In the present invention, the thermally conductive filler includes any one of zinc oxide, magnesium oxide, aluminum oxide, boron nitride, zinc nitride, aluminum nitride, magnesium hydroxide, aluminum hydroxide, silicon carbide, or graphite, or a combination of at least two thereof.
Preferably, the heat-conducting nylon material further comprises 5-20 parts by weight of titanium dioxide, such as 6 parts by weight, 8 parts by weight, 10 parts by weight, 12 parts by weight, 14 parts by weight, 16 parts by weight, 18 parts by weight or 19 parts by weight.
In the present invention, the thermally conductive nylon filler further includes other processing aids.
In the present invention, the other processing aids include any one or a combination of at least two of a toughening agent, a lubricant, a flame retardant, an anti-aging agent, or a light stabilizer.
The second purpose of the present invention is to provide a method for preparing a heat conductive nylon material according to the first purpose, the method comprising: firstly mixing the branched nylon 6, the nylon 12 and the maleic anhydride for the first time, then adding the heat-conducting filler for the second time, then adding the glass fiber, the optional titanium dioxide and other processing aids for the third time, and extruding to obtain the heat-conducting nylon material.
In the present invention, the time of the first mixing is 5-15min, such as 6min, 7min, 8min, 9min, 10min, 11min, 12min, 13min, 14min or 15 min.
In the present invention, the time of the second mixing is 5-20min, such as 6min, 7min, 8min, 9min, 10min, 11min, 12min, 13min, 14min, 15min, 16min, 17min, 18min or 19min, etc.
In the present invention, the time for the third mixing is 1-15min, such as 2min, 3min, 4min, 5min, 6min, 7min, 8min, 9min, 10min, 11min, 12min, 13min, 14min or 15 min.
In the present invention, the extrusion temperature is 170-.
Preferably, the extrusion speed is 200-500rpm, such as 220rpm, 250rpm, 280rpm, 300rpm, 320rpm, 350rpm, 380rpm, 400rpm, 420rpm, 450rpm or 480rpm, and the like.
The invention also aims to provide the application of the heat-conducting nylon material in electronic products, household appliances or industrial equipment.
Preferably, the heat-conducting nylon material is applied to a shell material of an electronic product.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, through the mutual matching of the nylon, the glass fiber, the maleic anhydride and the heat-conducting filler, the nylon material has excellent toughness, mechanical strength and heat-conducting property. The nylon is the combination of branched nylon 6 and nylon 12, so that the crystallinity of the polymer can be effectively reduced, the dispersion of glass fibers and heat-conducting fillers is facilitated, and the processing performance is improved; meanwhile, the physical property of the nylon material can be improved, the coating property is improved, a more stable cross-linked network structure is formed in the material, and the bending property, the toughness and the impact strength are further improved. The notch impact strength of the heat-conducting nylon material reaches 16.5-20 kJ/m2The tensile strength is 118-130 MPa, the bending strength is 140-160 MPa, the bending modulus is 1.2-1.35 GPa, the heat conductivity coefficient reaches 2.6-3.0W/mk, the heat conductivity coefficient is well balanced in the aspects of comprehensive properties such as heat conductivity, mechanical strength and flexibility, and the performance requirements of the shell material of electronic products such as a 5G route on the polymer heat conduction material can be fully met.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The embodiment provides a heat-conducting nylon material which comprises the following components in parts by weight:
the nylon is a combination of branched nylon 6 and nylon 12 in a mass ratio of 7:3, wherein the relative viscosity of the branched nylon 6 is 3.60, the branched nylon 6 is 3200H of the ba ling petrochemical, and the nylon 12 is purchased from the ba ling petrochemical; the heat conducting filler is a combination of aluminum nitride and silicon carbide in a mass ratio of 3: 2.
The preparation method of the heat-conducting nylon material comprises the following steps:
(1) mixing branched nylon 6, nylon 12 and maleic anhydride for 10min under the stirring condition to obtain a mixture A;
(2) adding a heat-conducting filler into the mixture A obtained in the step (1), and mixing for 15min under a stirring condition to obtain a mixture B;
(3) adding glass fiber (with the average diameter of 20 microns and dried after being soaked in a silane coupling agent KH 550) and titanium dioxide into the mixture B obtained in the step (2), mixing for 10min under the stirring condition, then adopting a double-screw extruder to melt and extrude at the temperature of 200-220 ℃, granulating, and drying to obtain the heat-conducting nylon material.
Example 2
The embodiment provides a heat-conducting nylon material which comprises the following components in parts by weight:
the nylon is a combination of branched nylon 6 and nylon 12 in a mass ratio of 2.5: 1; the heat-conducting filler is a combination of zinc oxide, magnesium oxide, aluminum oxide and aluminum hydroxide in a mass ratio of 1:1:1.5: 1.5.
The preparation method of the heat-conducting nylon material comprises the following steps:
(1) mixing the branched nylon 6, the nylon 12 and the maleic anhydride for 5min under the stirring condition to obtain a mixture A;
(2) adding a heat-conducting filler into the mixture A obtained in the step (1), and mixing for 10min under the stirring condition to obtain a mixture B;
(3) adding glass fiber (with the average diameter of 20 microns and dried after being soaked in a silane coupling agent KH 550) and titanium dioxide into the mixture B obtained in the step (2), mixing for 5min under the stirring condition, then adopting a double-screw extruder to perform melt extrusion granulation at the temperature of 180-195 ℃, and drying to obtain the heat-conducting nylon material.
Example 3
The embodiment provides a heat-conducting nylon material which comprises the following components in parts by weight:
the nylon is a combination of branched nylon 6 and nylon 12 in a mass ratio of 2: 1; the heat-conducting filler is a combination of zinc nitride, aluminum nitride, silicon carbide and magnesium hydroxide in a mass ratio of 1:2:1: 1.
The preparation method of the heat-conducting nylon material comprises the following steps:
(1) mixing the branched nylon 6, the nylon 12 and the maleic anhydride for 15min under the stirring condition to obtain a mixture A;
(2) adding a heat-conducting filler into the mixture A obtained in the step (1), and mixing for 20min under the stirring condition to obtain a mixture B;
(3) adding glass fiber (with the average diameter of 15 mu m, and dried after being soaked by silane coupling agent KH 550) and titanium dioxide into the mixture B obtained in the step (2), mixing for 15min under the stirring condition, then adopting an extruder to melt and extrude at the temperature of 195-210 ℃ for granulation, and drying to obtain the heat-conducting nylon material.
Example 4
This example provides a thermally conductive nylon material that differs from example 1 only in that the mass ratio of branched nylon 6 to nylon 12 is 1.5:1.
Example 5
This example provides a thermally conductive nylon material that differs from example 1 only in that the mass ratio of branched nylon 6 to nylon 12 is 3: 1.
Example 6
This example provides a thermally conductive nylon material that differs from example 1 only in that the mass ratio of branched nylon 6 to nylon 12 is 4: 1.
Example 7
This example provides a thermally conductive nylon material that differs from example 1 only in that the mass ratio of branched nylon 6 to nylon 12 is 5:1.
Example 8
This example provides a thermally conductive nylon material that differs from example 1 only in that the mass ratio of branched nylon 6 to nylon 12 is 1:1.
Example 9
This example provides a thermally conductive nylon material, which is different from example 1 only in that maleic anhydride is used in an amount of 4 parts by weight.
Example 10
This example provides a thermally conductive nylon material, which is different from example 1 only in that maleic anhydride is used in an amount of 7 parts by weight.
Example 11
This example provides a thermally conductive nylon material, which is different from example 1 only in that maleic anhydride is used in an amount of 3 parts by weight.
Example 12
This example provides a thermally conductive nylon material, which is different from example 1 only in that maleic anhydride is used in an amount of 10 parts by weight.
Comparative example 1
This comparative example provides a thermally conductive nylon material that differs from example 1 only in that the nylon is a combination of nylon 6 and nylon 12 in a mass ratio of 7: 3.
Comparative example 2
This comparative example provides a thermally conductive nylon material that differs from example 1 only in that the nylon is branched nylon 6.
Comparative example 3
This comparative example provides a thermally conductive nylon material that differs from example 1 only in that the nylon is nylon 12.
Comparative example 4
This comparative example provides a thermally conductive nylon material, which is different from example 1 only in that the thermally conductive filler is used in an amount of 25 parts by weight.
Comparative example 5
This comparative example provides a thermally conductive nylon material, which is different from example 1 only in that the thermally conductive filler is used in an amount of 50 parts by weight.
And (3) performance testing: (1) coefficient of thermal conductivity: W/mK, adopting a hot plate protection method in the national standard GB/T10294-2008 for testing;
(2) notched impact strength: kJ/m2The method is carried out by adopting a cantilever beam impact strength test method in the national standard GB/T1843-2008;
(3) tensile strength: MPa, measured according to the method in standard ASTM D638-2010;
(4) flexural strength and flexural modulus: the test was carried out according to the method in the standard ASTM D790-2003.
The thermally conductive nylon materials of examples 1 to 12 and comparative examples 1 to 5 were subjected to the performance test according to the above-described method, and the test results are shown in table 1:
TABLE 1
As can be seen from Table 1, the heat-conductive nylon materials provided in the embodiments 1 to 6 and 9 to 10 of the present invention have excellent heat-conductive performance and mechanical strength, and the notch impact strength thereof reaches 16.5 to 20kJ/m2The tensile strength is 118-130 MPa, the bending strength is 140-160 MPa, the bending modulus is 1.2-1.35 GPa, the heat conductivity coefficient reaches 2.6-3.0W/mk, the heat conductivity coefficient is well balanced in the aspects of comprehensive properties such as heat conductivity, mechanical strength and flexibility, and the performance requirements of electronic products on polymer heat-conducting materials can be fully met.
In the invention, the nylon is a combination of branched nylon 6 and nylon 12, and the two are matched with each other in a mass ratio of 1.5: 1-4: 1, so that the optimal processing performance and mechanical strength can be obtained; if the nylon material is not a combination of branched nylon 6 and nylon 12 (comparative examples 1 to 3), or if the mass ratio of the two is outside the above range (examples 7 and 8), it results in a decrease in the mechanical strength of the thermally conductive nylon material, in particular, in the notched impact strength, tensile strength and flexural strength.
In the heat-conducting nylon material, maleic anhydride is used as a chain extender and a toughening agent to be matched with nylon, and a more stable cross-linked network structure is formed after reaction, so that the heat-conducting nylon material has better bending property, toughness and impact strength; and when the mass ratio of the nylon to the maleic anhydride is 1: 0.1-1: 0.25, the heat-conducting nylon material can have better mechanical properties. The content of maleic anhydride exceeding the above-mentioned optimum range (examples 10 and 11) results in a decrease in the impact strength and bending strength of the heat conductive nylon material.
The nylon heat conduction material provided by the invention has high proportion of heat conduction filler, the formed high-density heat conduction channel is beneficial to heat conduction and dissipation, and the content of the heat conduction filler is 30-40 parts by weight based on 30-40 parts by weight of the nylon material, so that the obtained nylon heat conduction material reaches an ideal balance state in the aspects of heat conductivity and mechanical strength. If the amount of the heat conductive filler is too low (comparative example 4) or too high (comparative example 5), the balance of properties of the heat conductive nylon material is lost, making it impossible to combine high heat conductivity and high strength.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. The heat-conducting nylon material is characterized by comprising the following components in parts by weight:
the nylon is a combination of branched nylon 6 and nylon 12.
2. The heat conductive nylon material of claim 1, wherein the mass ratio of the branched nylon 6 to the nylon 12 is (1.5-4): 1;
preferably, the branched nylon 6 has a relative viscosity of 3.0 to 4.0.
3. The heat-conducting nylon material as claimed in claim 1 or 2, wherein the diameter of the glass fiber is 5-35 μm;
preferably, the glass fiber is alkali-free chopped glass fiber;
preferably, the glass fiber is a surface-treated glass fiber;
preferably, the surface treatment agent comprises a silane coupling agent.
4. A thermally conductive nylon material according to any of claims 1 to 3, wherein the mass of the maleic anhydride is 10 to 25%, preferably 12 to 20%, based on 100% of the mass of the nylon.
5. The thermally conductive nylon material of any one of claims 1-4, wherein the thermally conductive filler comprises any one or a combination of at least two of zinc oxide, magnesium oxide, aluminum oxide, boron nitride, zinc nitride, aluminum nitride, magnesium hydroxide, aluminum hydroxide, silicon carbide, or graphite;
preferably, the heat-conducting nylon material further comprises 5-20 parts by weight of titanium dioxide.
6. The thermally conductive nylon material of any one of claims 1-5, wherein the thermally conductive nylon filler further comprises other processing aids;
preferably, the other processing aids include any one or a combination of at least two of tougheners, lubricants, flame retardants, age resistors, or light stabilizers.
7. A method for preparing the heat-conductive nylon material as claimed in any one of claims 1 to 6, wherein the method comprises the following steps: firstly, mixing branched nylon 6, nylon 12 and maleic anhydride for the first time, then adding a heat-conducting filler for the second time, then adding glass fiber, optional titanium dioxide and other processing aids for the third time, and extruding to obtain the heat-conducting nylon material.
8. The method of claim 7, wherein the time of the first mixing is 5-15 min;
preferably, the time of the second mixing is 5-20 min;
preferably, the time for the third mixing is 1-15 min.
9. The method according to claim 7 or 8, wherein the temperature of the extrusion is preferably 170-;
preferably, the rotation speed of the extrusion is 200-500 rpm.
10. Use of the thermally conductive nylon material of any one of claims 1-6 in an electronic product, a household appliance or an industrial device;
preferably, the heat-conducting nylon material is applied to a shell material of an electronic product.
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