CN110684343A - Heat-conducting nylon replacing aluminum product and preparation method thereof - Google Patents
Heat-conducting nylon replacing aluminum product and preparation method thereof Download PDFInfo
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- CN110684343A CN110684343A CN201910912042.5A CN201910912042A CN110684343A CN 110684343 A CN110684343 A CN 110684343A CN 201910912042 A CN201910912042 A CN 201910912042A CN 110684343 A CN110684343 A CN 110684343A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- 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
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- 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
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/04—Ingredients characterised by their shape and organic or inorganic ingredients
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- 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
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- 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
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/06—Elements
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- 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
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/14—Glass
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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
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- 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
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- 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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
Abstract
The invention relates to the technical field of nylon, in particular to heat-conducting nylon replacing aluminum products and a preparation method thereof, wherein the heat-conducting nylon comprises the following raw materials in parts by weight: 650 parts of PA, 20-30 parts of carbon fiber, 30-40 parts of aluminum nitride, 1-3 parts of dispersant, 1-2 parts of lubricant and 0.5-1 part of antioxidant. The carbon fiber and the aluminum nitride are used as the composite heat-conducting filler, so that the mechanical property of the nylon material is enhanced, and the carbon fiber is used as the support of the aluminum nitride to form a rich three-dimensional heat-conducting network in the nylon matrix, so that the heat-conducting property of the material is remarkably improved, and the heat-conducting effect of an aluminum product is hopefully replaced.
Description
Technical Field
The invention relates to the technical field of nylon, in particular to heat-conducting nylon replacing aluminum products and a preparation method thereof.
Background
With the development of industrial production and scientific technology, high requirements are put on the thermal conductivity of materials in many fields, especially for chip packaging and lamp design applications in the field of LEDs, and the heat generated by LEDs needs to be released through a thermal conductive material. Almost all radiators adopted by LED lighting products in the current market are made of metal materials or ceramic materials, but metal products have large specific gravity, multiple forming processes (such as die-casting aluminum, a series of processes of casting, die-casting, grinding, polishing, nickel plating and nitriding), long forming period and large occupied space of equipment; the ceramic product has more complex forming process, single appearance, difficult realization of large-scale automatic production and relatively higher cost. Compared with the two common materials, the organic heat-conducting plastic has the advantages of light weight, high design freedom, low energy consumption, low pollution, high large-scale production degree and the like.
The nylon with the first yield of engineering plastics has the advantages of excellent mechanical property, better electrical property, wear resistance, oil resistance, solvent resistance, self lubrication, corrosion resistance, good processability and the like, and is widely applied to the fields of automobiles, electronic and electric appliances, machinery, electricity, weapons and the like. However, nylon generally has a thermal conductivity of 0.25W (m.K)-1Therefore, the application of the nylon in the fields of heat dissipation, heat conduction and the like is limited, the nylon is modified to be prepared into the heat conduction material, and the application range of the nylon is further widened.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention aims to provide heat-conducting nylon for replacing aluminum products and a preparation method thereof.
The purpose of the invention is realized by the following technical scheme:
the heat-conducting nylon replacing aluminum products comprises a component A, wherein the component A comprises the following raw materials in parts by weight:
the heat-conducting property of the filled plastic mainly depends on whether the heat-conducting filler forms a heat-conducting passage in the matrix, the carbon fiber and the aluminum nitride are used as the composite heat-conducting filler, the mechanical property of the nylon material is enhanced, and the carbon fiber is used as the bracket of the aluminum nitride to form a rich three-dimensional heat-conducting network in the nylon matrix, so that the heat-conducting property of the material is obviously improved, and the heat-conducting effect of an aluminum product is hopefully replaced.
Wherein the PA6 has a melt index of 15-20g/10min at 230 ℃ and under a load of 2.16kg, and a relative viscosity of 2.5-3. The processing performance of the PA6 can be improved by optimizing the melt index and the relative viscosity of the PA6, the dispersibility of the heat-conducting filler in nylon is improved, and the mechanical property and the heat-conducting property of the nylon material are improved.
Wherein the monofilament diameter of the carbon fiber is 6-8 μm, and the length is 2-3 mm.
Wherein the diameter of the aluminum nitride is 100-200 nm.
According to the invention, the micron-sized carbon fibers and the nano-sized aluminum nitride are compounded, so that the aluminum nitride is more easily dispersed in gaps among the carbon fibers, and a tight heat conduction chain is more easily formed in a matrix, so that the heat conductivity of the composite material is obviously improved.
Wherein the dispersant is erucamide, oleamide or a mixture of the erucamide and the oleamide.
Wherein the lubricant is at least one of talcum powder, polyethylene wax and polypropylene wax.
Wherein the antioxidant is a hindered phenol antioxidant and/or a phosphite antioxidant.
The preparation method of the heat-conducting nylon replacing the aluminum product comprises the following steps: mixing carbon fibers, aluminum nitride and a dispersing agent to obtain a pre-dispersing material, and adding the pre-dispersing material, PA6, a lubricating agent and an antioxidant into a double-screw extruder for melt extrusion to obtain the composite material.
However, the heat-conducting fillers in the matrix are contacted with each other to form a heat-conducting network chain, which means that the matrix is difficult to fully soak and coat the heat-conducting fillers, so that more stress concentration points are formed in the matrix, the matrix cannot form a complete heat-conducting network chain before the filling amount of 50 wt%, the heat conductivity is not obviously improved, and the heat-conducting fillers are continuously added after the filling amount of 50 wt%, although the heat conductivity is obviously improved, the mechanical properties such as tensile strength, bending strength, impact strength and the like are obviously reduced to different degrees.
In order to enable the heat-conducting nylon to have better comprehensive performance, the heat-conducting nylon also comprises a component B, wherein the component B comprises the following raw materials in parts by weight:
the specific use method of the heat-conducting nylon comprises the following steps: respectively carrying out melt extrusion granulation on the component A and the component B to obtain heat conduction particles and reinforcing particles, mechanically stirring, mixing and dispersing the heat conduction particles and the reinforcing particles, and then introducing the heat conduction particles and the reinforcing particles into corresponding dies for solidification.
The double-component heat-conducting nylon has the advantages that: although the component A and the component B are not subjected to melt mixing, the formed product still has stress concentration points inevitably, but the probability that the component A forms a heat conduction path in the product is higher, so that the finally obtained product still has better heat conductivity, and the mechanical properties such as tensile strength and the like are still dependent on the weakness of the product, but the network structure of the expanding filler can be inserted into the component A through the dilution of the component B and the insertion of the glass fiber, so that the finally obtained product has better mechanical properties.
The invention has the beneficial effects that: the carbon fiber and the aluminum nitride are used as the composite heat-conducting filler, so that the mechanical property of the nylon material is enhanced, and the carbon fiber is used as the support of the aluminum nitride to form a rich three-dimensional heat-conducting network in the nylon matrix, so that the heat-conducting property of the material is remarkably improved, and the heat-conducting effect of an aluminum product is hopefully replaced.
Detailed Description
The present invention will be further described with reference to the following examples for facilitating understanding of those skilled in the art, and the description of the embodiments is not intended to limit the present invention.
Example 1
The heat-conducting nylon replacing aluminum products comprises a component A, wherein the component A comprises the following raw materials in parts by weight:
wherein the PA6 has a melt index of 18g/10min at 230 ℃ and under a load of 2.16kg and a relative viscosity of 2.7. In other alternative embodiments, the PA may have a melt index of 15, 16, 17, 19, 20g/10min, etc., and a relative viscosity of 2.5, 2.6, 2.8, 2.9, 3.0, etc.
Wherein the monofilament diameter of the carbon fiber is 7 μm, and the average length is 2.4 mm. In other alternative embodiments, the carbon fibers may have monofilament diameters of 6, 6.5, 7.5, 8 μm, etc., and average lengths of 2, 2.2, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0mm, etc.
Wherein the diameter of the aluminum nitride is 150 nm. In other alternative embodiments, the aluminum nitride may have a diameter of 100, 110, 120, 140, 160, 170, 180, 190, 200nm, etc.
Wherein the dispersant consists of erucamide and oleamide according to the weight ratio of 1: 1. In other alternative embodiments, the dispersant may be one of erucamide and oleamide
Wherein the lubricant is polypropylene wax. In other alternative embodiments, the lubricant may be at least one of talc, polyethylene wax, and polypropylene wax.
Wherein the antioxidant is a hindered phenol antioxidant. In other alternative embodiments, the antioxidant may be a hindered phenolic antioxidant and/or a phosphite antioxidant.
Example 2
The present embodiment is different from embodiment 1 in that:
the component A comprises the following raw materials in parts by weight:
example 3
The present embodiment is different from embodiment 1 in that:
the component A comprises the following raw materials in parts by weight:
example 4
A heat-conducting nylon replacing aluminum products comprises a component A and a component B, wherein the component A comprises the following raw materials in parts by weight:
the component B comprises the following raw materials in parts by weight:
in other alternative embodiments, the glass fibers may be used in amounts of 20, 21, 22, 23, 24, 26, 27, 28, 29, 30 parts by weight, etc., the lubricant may be used in amounts of 1, 1.2, 1.4, 1.6, 1.7, 1.8, 1.9, 2.0 parts by weight, etc., and the antioxidant may be used in amounts of 0.5, 0.6, 0.8, 0.9, 1.0 parts by weight, etc.
The specific use method of the heat-conducting nylon of the embodiment is as follows: respectively carrying out melt extrusion granulation on the component A and the component B to obtain heat conduction particles and reinforcing particles, mechanically stirring, mixing and dispersing the heat conduction particles and the reinforcing particles, and then introducing the heat conduction particles and the reinforcing particles into corresponding dies for solidification.
Wherein the PA6 has a melt index of 18g/10min at 230 ℃ and under a load of 2.16kg and a relative viscosity of 2.7.
Wherein the monofilament diameter of the carbon fiber is 7 μm, and the average length is 2.4 mm.
Wherein the diameter of the aluminum nitride is 150 nm.
Wherein the glass fiber is alkali-free glass fiber
Wherein the dispersant consists of erucamide and oleamide according to the weight ratio of 1: 1.
Wherein the lubricant is polypropylene wax.
Wherein the antioxidant is a hindered phenol antioxidant.
Comparative example 1
This comparative example differs from example 4 in that:
the preparation method of the heat-conducting nylon comprises the following steps: respectively carrying out melt extrusion granulation on the component A and the component B to obtain heat conduction particles and reinforcing particles, carrying out melt extrusion granulation on the heat conduction particles and the reinforcing particles again, and carrying out extrusion molding or pouring into a mold for molding when in use.
Comparative example 2
The nylon material of the comparative example consists of the following raw materials in parts by weight:
wherein the glass fiber is alkali-free glass fiber
Wherein the lubricant is polypropylene wax.
Wherein the antioxidant is a hindered phenol antioxidant.
In examples 1 to 4 and comparative examples 1 to 2, the nylon material was pelletized by extrusion using a twin-screw extruder having a first zone temperature of 220 ℃, a second zone temperature of 240 ℃, a third zone temperature of 260 ℃, a fourth zone temperature of 250 ℃ and a fifth zone temperature of 240 ℃. The test pieces finally obtained in examples 1 to 4 and comparative examples 1 to 2 were 1cm long, 0.5cm wide and 0.2cm thick, and were respectively tested for tensile strength, flexural strength, impact strength and thermal conductivity, and the test results were as follows:
as can be seen from the above table, the thermal conductivity of the two-component nylon of the invention is far lower than that of the single-component heat-conducting nylon, but the mechanical property is obviously improved, the comprehensive performance is better, and the industrial production requirement can be more easily met; the mechanical properties of the bicomponent nylon are far inferior to those of comparative examples 1 and 2 in which glass fibers and heat-conducting fillers are filled simultaneously or glass fibers are filled separately, but the thermal conductivity of comparative example 1 is only slightly higher than that of comparative example 2 because the heat-conducting filler accounts for a relatively low proportion and a heat-conducting path cannot be formed, and the tensile strength and the bending strength are more prominent than those of comparative example 2 because the inorganic filler accounts for a relatively high proportion, but the impact strength has no obvious advantages. As can be seen from the comparison between the embodiment 4 and the comparative examples 1 and 2, although the mechanical properties of the bicomponent nylon of the invention are not outstanding, an effective heat conduction channel is formed in the matrix, the heat conduction performance is better, the mechanical properties are more balanced, and the basic use requirements are met.
The above-described embodiments are preferred implementations of the present invention, and the present invention may be implemented in other ways without departing from the spirit of the present invention.
Claims (8)
1. A heat conduction nylon replacing aluminum products is characterized in that: the composition comprises a component A, wherein the component A comprises the following raw materials in parts by weight:
2. the heat-conductive nylon replacing aluminum products as claimed in claim 1, wherein: the PA6 has a melt index of 15-20g/10min at 230 ℃ and under a load of 2.16kg and a relative viscosity of 2.5-3.
3. The heat-conductive nylon replacing aluminum products as claimed in claim 1, wherein: the monofilament diameter of the carbon fiber is 6-8 μm, and the length is 2-3 mm.
4. The heat-conductive nylon replacing aluminum products as claimed in claim 1, wherein: the diameter of the aluminum nitride is 100-200 nm.
5. The heat-conductive nylon replacing aluminum products as claimed in claim 1, wherein: the dispersant is erucamide, oleamide or a mixture of the erucamide and the oleamide.
6. The heat-conductive nylon replacing aluminum products as claimed in claim 1, wherein: the lubricant is at least one of talcum powder, polyethylene wax and polypropylene wax.
7. The heat-conductive nylon replacing aluminum products as claimed in claim 1, wherein: the antioxidant is hindered phenol antioxidant and/or phosphite antioxidant.
8. The method for preparing the heat-conductive nylon replacing the aluminum product according to any one of claims 1 to 7, wherein the method comprises the following steps: the method comprises the following steps: mixing carbon fibers, aluminum nitride and a dispersing agent to obtain a pre-dispersing material, and adding the pre-dispersing material, PA6, a lubricating agent and an antioxidant into a double-screw extruder for melt extrusion to obtain the composite material.
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| CN201910912042.5A CN110684343A (en) | 2019-09-25 | 2019-09-25 | Heat-conducting nylon replacing aluminum product and preparation method thereof |
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2019
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| CN102796369A (en) * | 2012-07-25 | 2012-11-28 | 上海耐特复合材料制品有限公司 | Heat conduction polyimide composite material, preparation method and application thereof |
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Non-Patent Citations (1)
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