CN109282195B - Illumination radiator and illumination assembly using same - Google Patents
Illumination radiator and illumination assembly using same Download PDFInfo
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- CN109282195B CN109282195B CN201811242955.2A CN201811242955A CN109282195B CN 109282195 B CN109282195 B CN 109282195B CN 201811242955 A CN201811242955 A CN 201811242955A CN 109282195 B CN109282195 B CN 109282195B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S8/00—Lighting devices intended for fixed installation
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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
- C08K3/02—Elements
- C08K3/04—Carbon
- C08K3/041—Carbon nanotubes
-
- 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
- C08K3/02—Elements
- C08K3/04—Carbon
- C08K3/042—Graphene or derivatives, e.g. graphene oxides
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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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/85—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material
- F21V29/87—Organic material, e.g. filled polymer composites; Thermo-conductive additives or coatings therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
Abstract
The invention discloses an illumination radiator and an illumination assembly applying the same. The illumination heat sink includes: a first component having a planar configuration, the first component having a first surface and a second surface; a second member having a lattice structure, the second member being attached to the first surface of the first member; the heat conduction silicone grease layer is provided with a first surface and a second surface, the first surface of the heat conduction silicone grease layer is attached to the second surface of the first component, and the second surface of the heat conduction silicone grease layer is in contact with the illumination light source. The heat-conducting silicone grease comprises silicone oil and additives, wherein the additives comprise fluorinated graphene. The radiator of the invention adopts the novel heat-conducting silicone grease, thereby greatly improving the heat-conducting efficiency of the radiator and further shortening the size of the radiator.
Description
Technical Field
The invention relates to the technical field of LED illumination, in particular to an illumination radiator and an illumination assembly applying the same.
Background
As a new generation of green light source and lighting technology with environmental protection and energy saving, high-power LEDs are rapidly developed in recent years. The high-power LED has the problems of poor heat dissipation and low light-emitting rate, because the reliability of the LED is directly influenced by heat dissipation, the service life and the application of the LED are further influenced, and the development of the LED is directly restricted by the low light-emitting rate, the research on the heat dissipation design of the LED is very important. In order to solve the heat dissipation problem of the high-power LED, scholars and engineers at home and abroad have conducted a great deal of research on LED chips, packaging structures, packaging materials, external heat dissipation methods, and the like. There are various excellent LED package structures such as leaded packages, surface mount packages, and Chip On Board (COB) packages that have been recently developed. The COB technology is adopted, the LED chip is directly packaged on the aluminum substrate, the distance between a heat channel and heat conduction is shortened, and therefore the junction temperature of the LED is reduced. COB packaging refers to an LED packaging technique in which an LED chip is directly fixed on a Printed Circuit Board (PCB), and the chip and the PCB are electrically connected by wire bonding. It can package dozens or even hundreds of chips in 1 very small area to form the surface light source. Compared with point light source packaging, the COB surface light source packaging technology has the advantages of low price (about 1/3 of the same chip), space saving, easiness in heat dissipation, improvement of luminous efficiency, mature packaging technology and the like.
For high-power COB packaging, heat dissipation is a crucial factor affecting long-term reliability. The increase in the junction temperature of the COB-packaged product reduces the overall efficiency of the LED, reduces the forward voltage, causes a red shift in the emitted light, and reduces the lifetime and reliability.
The selection of the LED packaging material has great influence on the heat dissipation and light extraction efficiency of the LED device. Therefore, in order to find a packaging material with high thermal conductivity, it is necessary to optimize the heat dissipation performance of the device in terms of material selection.
At present, the photoelectric conversion efficiency of the COB package is low, 70% or even higher electric energy is converted into heat energy, and particularly, the heat dissipation capacity of the side surface and the upper surface of the chip is very poor, so that most of generated heat is transferred to a heat sink at the bottom of the chip in a heat conduction mode and is consumed in a heat convection mode. In addition, because the COB light source does not have the heat dissipation capacity, the COB light source can normally work only by adding a radiator, the COB light source and the radiator need to be tightly attached to efficiently lead out heat, otherwise, because of the existence of an air gap, the heat conductivity coefficient of air is very small, the COB light source is an unfavorable conductor, thermal contact resistance can be formed between the chip and the radiator, and the heat dissipation effect is reduced.
Therefore, the heat of the chip is transferred to the heat sink through an adhesive material between the heat sink and the light source. Generally, a thermal grease is coated between the COB light source and the heat dissipation fins to reduce thermal resistance.
The heat-conducting silicone grease is commonly called as heat-conducting grease or heat-radiating grease, is a paste-shaped efficient heat-radiating material, is usually filled between a support of an LED light source and an aluminum substrate or between the aluminum substrate and a heat-radiating shell, has very good fluidity, and can fully moisten and infiltrate the surfaces of two materials needing heat conduction, so that a very low thermal resistance interface is formed, and the heat conduction efficiency is higher than that of air between the contact surface of the LED light source and a heat radiator. From the basic characteristics, the silicone grease is a white or other-color paste which is generally processed by a special process by taking special silicone oil as base oil, taking novel metal oxide as a filler and matching with various functional additives, and the heat-conducting silicone grease has the characteristics of excellent heat conductivity, electric insulation, use stability, high and low temperature resistance and the like, and is a heat-conducting material commonly used by the conventional high-power LED lamp.
The thermal conductivity of the heat-conducting silicone grease increases with the increase of the filler content, and the performance of the heat-conducting silicone grease decreases with the increase of the viscosity, so that the heat-conducting silicone grease is difficult to flow or deform, and the gap between the chip and the heat radiator is completely filled. Therefore, it is necessary to select a proper heat conductive filler to achieve high thermal conductivity of the heat conductive silicone grease and to ensure a low viscosity value.
Graphene is a new material, has ultra-thin, ultra-light, ultra-high strength, ultra-high electrical conductivity, excellent room temperature heat conduction and light transmittance, and is applied to various fields as a heat dissipation material due to the excellent heat conduction performance. The applicant has already studied the application of graphene in the heat-conducting silicone grease in the early stage, and applied for the CN201210119361.9 patent, the heat conductivity coefficient of the whole system is improved by adding graphene in silicone oil and utilizing the heat conductivity of graphene, and the phenomenon of separation of silicone oil and heat-conducting filler is solved by adding multi-walled carbon nanotubes. In the technology, although the heat conduction efficiency of the heat conduction silicone grease can be well improved, the used graphene is not limited, so that the performance of the heat conduction silicone grease is unstable, the single-layer graphene is low in material yield based on technical reasons, so that the material cost is high, the higher the graphene addition amount is, the smaller the space occupied by the basic silicone oil in the composite material is, the lubrication effect played by the silicone oil is weakened, the viscosity value of the composite material is increased, the performance is deteriorated, the addition of the multi-layer graphene is used as a part of the heat conduction filler, the influence on the heat conductivity of the final composite material is not obvious for the metal heat conduction filler, and along with the continuous development of chip technology, the heat dissipation requirement on chips is higher and higher, and the heat conduction silicone grease added with the multi-layer graphene is more and less capable of meeting the development requirement of the chips.
Technical scheme
Aiming at the problems of the heat-conducting silicone grease researched by the applicant in the early stage, the invention provides a novel heat-conducting silicone grease, which is characterized in that graphene is modified, the self-lubricating property of thin-layer graphene is enhanced, the occurrence of accumulation is avoided, the novel heat-conducting silicone grease is used as a dispersing agent for dispersing heat-conducting particles, the uniform dispersion of the heat-conducting particles in the whole system is realized, and the heat-radiating performance of the system is improved. The heat-conducting silicone grease has high heat-conducting efficiency, so that the size of the heat radiator can be further shortened to 4/5-5/6.
The present invention provides an illumination heat sink, comprising: a first component having a planar configuration, the first component having a first surface and a second surface; a second member having a lattice structure, the second member being attached to the first surface of the first member; the heat conduction silicone grease layer is provided with a first surface and a second surface, the first surface of the heat conduction silicone grease layer is attached to the second surface of the first component, and the second surface of the heat conduction silicone grease layer is in contact with the illumination light source.
According to one embodiment of the present invention, the heat conductive silicone grease in the lighting heatsink comprises: the volume percentage of the silicone oil and the additive is 40-60% of the additive and 40-60% of the silicone oil, and the volume percentage is based on the total volume of the heat-conducting silicone grease; wherein the additive comprises fluorinated graphene.
According to one embodiment of the invention, the additive in the lighting heatsink further comprises multi-walled carbon nanotubes and a metal oxide filler; the additive comprises 25-50% of multi-walled carbon nanotubes, 20-30% of fluorinated graphene and 30-55% of metal oxide filler by mass, wherein the mass percentages are based on the total mass of the additive.
According to one embodiment of the present invention, the fluorinated graphene in the illumination heat sink has a micro-sheet structure.
According to one embodiment of the present invention, the fluorinated graphene nanoplatelets in the illumination heatsink have a thickness of 5 to 18 nanometers.
According to one embodiment of the present invention, the fluorinated graphene micro-platelets in the illumination heatsink have a diameter of 6 to 9 microns.
According to one embodiment of the present invention, the fluorinated graphene nanoplatelets have a purity of greater than 99.5 wt%.
According to an embodiment of the present invention, the number of fluorinated graphene nanoplatelets is less than 30, preferably less than 25, preferably less than 20.
According to an embodiment of the present invention, the fluorinated graphene has a density of 0.15 to 0.30g/cm3Preferably 0.20g/cm3，0.23g/cm3，0.28g/cm3。
The fluorinated graphene has an ultra-large shape ratio (diameter/thickness ratio) and a nano-thickness, is easy to be uniformly compounded with other materials such as polymer materials, and forms a good compound interface; has the characteristics of excellent conductivity, lubrication, corrosion resistance, high temperature resistance and the like.
According to one embodiment of the invention, the additive in the heat-conducting silicone grease further comprises multi-walled carbon nanotubes and a metal oxide filler, wherein the additive comprises 25-50% by mass of the multi-walled carbon nanotubes, 20-30% by mass of the fluorinated graphene micro-sheets and 30-55% by mass of the metal oxide filler, and the mass percentages are based on the total mass of the additive.
According to one embodiment of the invention, the additive comprises 30-45% of multi-walled carbon nanotubes, 23-25% of fluorinated graphene micro-sheets and 35-45% of metal oxide filler by mass, wherein the mass percentages are based on the total mass of the additive.
According to one embodiment of the invention, the additives in the heat-conducting silicone grease further comprise multi-walled carbon nanotubes and metal oxide fillers, wherein the additives comprise 35% by mass of the multi-walled carbon nanotubes, 20% by mass of the fluorinated graphene micro-sheets and 45% by mass of the metal oxide fillers, and the mass percentages are based on the total mass of the additives.
According to one embodiment of the invention, the purity of the carbon nano tube is more than or equal to 97 wt%, the ash content is less than or equal to 0.2 wt%, and the specific surface area is about 200-300 m2/g。
According to one embodiment of the present invention, the metal element of the metal oxide filler is tin, rare earth element, zinc, aluminum, calcium, platinum, silver, etc., preferably the metal oxide filler is alumina or alumina-coated paraffin capsules, preferably the capsule phase transition temperature is 29 ℃, preferably the capsule average particle size is 60 microns.
According to one embodiment of the invention, the metal oxide filler has a particle size of 1 to 100 microns, preferably 30 to 80 microns, more preferably 60 microns.
According to one embodiment of the invention, the silicone oil is selected from at least one of the following: dimethyl silicone oil, vinyl silicone oil, hydrogen-containing silicone oil, benzyl silicone oil, hydroxyl silicone oil, methyl long-chain alkyl silicone oil or quaternary ammonium salt alkyl modified silicone oil.
According to one embodiment of the invention, the viscosity of the silicone oil is 50000-500000 cSt at 25 ℃.
According to one embodiment of the present invention, the thermally conductive silicone grease further includes optional stabilizers, flame retardants, colorants, thixotropic agents, and other additive components.
When the amount of the metal oxide filler in the silicone grease is too small, the thermal conductivity is relatively low, the metal oxide filler is not suitable for filling a substrate, but agglomeration easily occurs along with the increase of the mass of the metal oxide, the metal oxide filler is difficult to add into the silicone oil, the viscosity is relatively high, the interface thermal resistance is increased, and the overall heat conduction effect is poor.
One important factor affecting the heat-conducting capability of the heat-conducting silicone grease is the construction of the heat-conducting path. Studies have shown that the formation of the heat conduction path is to some extent more important than the intrinsic heat conduction of the filler when the thermal conductivity of the inorganic filler is two orders of magnitude higher than that of the organic matrix. The multi-walled carbon nanotubes are connected together through van der Waals force to form an effective three-dimensional heat conduction network, so that effective heat conduction in the heat conduction silicone grease is realized, and the good heat conduction efficiency is still kept under the condition that the using amount of the heat conduction particles is reduced. Compared with the technology previously applied by the applicant, the method further increases the dosage of the multi-wall carbon nano-tube, reduces the function of the fluorinated graphene as the heat conducting particles, and only serves as a lubricating dispersant, so that the heat conducting performance is maintained or even improved on the basis of reducing the dosage of the fluorinated graphene.
Generally, spherical heat conductive particles in a silicone grease system are not necessarily orderly, and the occurrence of particle clusters is easy to occur, so that the viscosity of the silicone grease is suddenly increased, and the silicone grease is difficult to flow or deform. In the invention, the graphene nano-sheets divide the particles into a large number of microstructures similar to unit cells, and the microstructures spatially limit the movement of spherical particles, thereby reducing the probability of generating large particle clusters and utilizing the microstructuresThe self-lubricating property reduces the friction coefficient of the oily medium and the heat conducting particles, which is very beneficial to forming a suspension with high fluidity and high volume fraction. But graphene nanoplatelets are due to pi-pi*The interaction between bonds easily causes stacking effect, and affects the uniform dispersion in the whole system, thereby affecting the heat-conducting property. In order to overcome the uniform dispersibility of graphene nanosheets, covalent modification is attempted to be performed on graphene to obtain graphene oxide, but the graphene oxide has great structural damage to the graphene nanosheets and is difficult to maintain the inherent characteristics of the graphene oxide, and due to the rich specific surface area of the graphene oxide, the graphene loses fluidity, becomes sticky and influences the thermal conductivity. In the application, the graphene nanosheet is subjected to fluorinated modification to eliminate pi-pi*The interaction between bonds reduces the possibility of stacking, so that the graphene has better fluidity and fully exerts the excellent dispersibility advantage. The connection between the fluorinated graphene layers is weak, and the fluorinated graphene layers can be separated by ultrasonic waves, so that the pi-pi is eliminated*The keys, the sheets have less overlap and stacking between them.
According to one embodiment of the present invention, a preparation method of fluorinated graphene nanoplatelets of the present invention comprises: adding graphite fluoride into sulfolane solution, heating and refluxing for 1-3 hours (preferably 2 hours) under the condition of 50-70 ℃ (preferably 60 ℃), and cooling to room temperature; and (3) carrying out ultrasonic treatment for 0.5 to 1.5 hours (preferably 1 hour), and taking the supernatant to obtain the fluorinated graphene microchip with a small number of layers.
According to one embodiment of the invention, 1ml of sulfolane is used for every 5mg of graphite fluoride in the preparation of the fluorinated graphene nanoplatelets of the invention.
The invention also provides a preparation method of the heat-conducting silicone grease, which comprises the following steps: pouring the fluorinated graphene and the metal oxide filler into a small amount of silicone oil according to a certain proportion for premixing, slowly adding the multi-walled carbon nano tube with required mass under the condition of mechanical stirring, simultaneously supplementing the silicone oil at any time until the content of the required silicone oil is up to the required content, continuously mechanically stirring uniformly, and continuously grinding the mixture for 1-2 hours by using a double-roller grinding machine to obtain the heat-conducting silicone grease.
Compared with the heat-conducting silicone grease developed by the applicant early, the heat-conducting silicone grease provided by the invention has higher heat-conducting efficiency, and can realize heat conduction more quickly when the same power chip is used, so that the effect is more obvious for a COB chip with higher power, and the heat-conducting silicone grease is more suitable for the quick development of the COB chip. By taking the graphene heat dissipation LED lamp tube researched and developed by the applicant as an example, through practical verification, under the condition of adopting COB chips with the same power, the heat conduction efficiency is better due to the adoption of the heat conduction silicone grease, the heat can be dissipated more quickly, under the condition of keeping the same other conditions, the size of the whole lamp tube can be reduced to 5/6-4/5, and the same heat dissipation effect is achieved.
According to one embodiment of the invention, the first part of the lighting heatsink is made of metal, metal oxide or ceramic and the second part is selected from metal, metal oxide or ceramic.
According to one embodiment of the invention, the surface of the second part grid structure in the lighting radiator is coated with fluorine resin containing graphene.
The present invention also provides an LED lighting assembly, comprising: a lighting heatsink according to the invention; and the LED light source is attached to the second surface of the heat conduction silicone layer of the lighting radiator.
According to an embodiment of the invention, the lighting assembly further comprises: the device comprises a driving power supply, a fixed support and a base; the driving power supply is connected with the base, the base is connected with the fixed support, and the fixed support fixes the lighting radiator.
According to one embodiment of the invention, the illumination assembly further comprises a rubber ring, a level, a stopper and a lens. The driving power supply and the base are fixedly connected through screws, a rubber ring is arranged at the connecting position of the fixed support and the base and used for sealing connection of the two positions, the lens is fixedly arranged on the radiator, and the LED light source is arranged between the radiator and the lens. The fixed support fixes the first end of the lighting radiator, and the plug is installed at the second end of the radiator through a screw and used as a front cover. The level gauge is arranged on a base, and the base is in contact connection with a driving power supply.
The lighting radiator of the invention is preferably made of aluminum material or any commercially available aluminum alloy material, and ceramic material or iron material can be selected.
According to one embodiment of the invention, the lighting radiator is a semicircular cylinder, the first part is a plane part of the semicircular cylinder, and the surface of the semicircular curved surface of the second part is processed into a hollow grid shape, so that the contact area of the lighting radiator and air is increased, and the heat conduction is further optimized.
The planar part of the semi-cylindrical section of the illumination radiator is rectangular, the length of the longitudinal section of the rectangle is 80-240 mm, more preferably 145-175 mm, for example 145mm, 150mm, 155mm, 165mm, 175mm and the like, the width of the rectangle is 20 mm-80 mm, more preferably 40-60 mm, and the width of the rectangle can be 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, 51mm, 52mm, 53mm, 54mm, 55mm and the like. The lighting radiator is a semicircular column, and the radius of the semicircle of the cross section of the lighting radiator is usually 10-40 mm, more preferably 20-30 mm, and can be 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm and the like.
The heat sink may also be provided with a heat-conducting temperature-uniforming plate as required, and the heat-conducting temperature-uniforming plate may be provided therein with a graphene phase-change material, so as to improve uniformity of heat conduction.
In order to further increase heat conduction and heat radiation rate on the premise of optimizing the shape and size, the graphene-containing fluororesin composite is combined with a heat sink in the present invention. The fluororesin heat dissipation material containing graphene is sprayed on the outer surface of the semi-circle of the radiator, so that the heat dissipation efficiency of the radiator is improved. The fluororesin composite material comprising graphene (which may also be referred to as RLCP graphene fluororesin composite material) used has been disclosed in the applicant's prior patent CN201310089504.0 and will not be described in detail herein.
According to the heat-conducting silicone grease disclosed by the invention, the fluorinated graphene microchip is utilized, the heat-conducting particles are prevented from forming large particle clusters, the self-lubricating property of the heat-conducting silicone grease is utilized, the friction coefficient of an oily medium and the heat-conducting particles is reduced, the heat-conducting channel is formed in the heat-conducting silicone grease by adding the multi-walled carbon nano tube, and the internal structure of the whole heat-conducting silicone grease is changed, so that the heat-conducting performance of the heat-conducting particles is improved.
Drawings
FIG. 1 is a perspective view of an illumination heat sink according to the present invention;
FIG. 2 is a side view of the heat sink of the present invention;
FIG. 3 is a side view of the heat sink of the present invention;
FIG. 4 is an exploded view of the overall construction of the lighting assembly of the present invention;
FIG. 5 is an exploded view of the overall structure of the street lamp of the present invention;
FIG. 6 is an assembled view of the street lamp of the present invention.
Detailed Description
The following embodiments are described in detail to solve the technical problems by applying technical means to the present invention, and the implementation process of achieving the technical effects can be fully understood and implemented.
Example 1
Preparation of fluorinated graphene nanoplatelets
Adding graphite fluoride into a sulfolane solution, heating and refluxing for 2 hours at the temperature of 60 ℃ by adopting 1ml of sulfolane for every 5mg of graphite fluoride, then cooling to room temperature, carrying out ultrasonic treatment for 1 hour, taking supernatant, and preparing the fluorinated graphene nanoplatelets with a small number of layers.
Preparation of heat-conducting silicone grease
Pouring the fluorinated graphene nanoplatelets and the metal oxide filler into a small amount of silicone oil for premixing, slowly adding the multi-walled carbon nanotubes with required mass under the condition of mechanical stirring, simultaneously supplementing the silicone oil at any time until the content of the required silicone oil is reached, continuously mechanically stirring for half an hour, and continuously grinding the mixture for 1-2 hours by using a double-roller grinder to obtain the heat-conducting silicone grease, wherein the volume ratio of the additive to the silicone oil is 6: 4.
the silicone oil is selected from dimethyl silicone oil with the viscosity of 500000cSt at 25 ℃.
The metal oxide particles are aluminum oxide and have an average volume particle size of 50-60 μm.
The fluorinated graphene nanoplatelets, the aluminum oxide and the multi-walled carbon nanotubes are respectively as follows by weight percent: 20% of fluorinated graphene nanoplatelets, 45% of aluminum oxide and 35% of multi-walled carbon nanotubes.
Example 2
Example 2 is different from example 1 only in that the fluorinated graphene nanoplatelets, the alumina, and the multi-walled carbon nanotubes are, by weight, in the following percentages: 20% of fluorinated graphene micro-sheets, 30% of aluminum oxide and 50% of multi-walled carbon nanotubes.
Example 3
Example 3 differs from example 1 only in that the fluorinated graphene nanoplatelets, the alumina, and the multi-walled carbon nanotubes are, by weight, in the total weight of the three: 30% of fluorinated graphene micro-sheets, 30% of aluminum oxide and 40% of multi-walled carbon nanotubes.
Example 4
Example 4 differs from example 1 only in that alumina is replaced with a phase change capsule coated with paraffin (the material for coating paraffin is alumina, the phase change temperature is 29 ℃, and the average particle size is 60 um).
Comparative example 1
Comparative example 1 differs from example 1 only in that graphene is substituted for fluorinated graphene nanoplatelets.
Comparative example 2
The difference between the comparative example 2 and the example 1 is that the fluorinated graphene nanoplatelets, the alumina and the multi-walled carbon nanotubes are respectively as follows by weight percent: 60% of fluorinated graphene micro-sheets, 30% of aluminum oxide and 10% of multi-walled carbon nanotubes.
Comparative example 3
Comparative example 3 differs from example 1 only in the following additive components and their mass ratios: the mass percentages of the multi-wall carbon nano-tube, the graphene and the phase-change capsule wrapping the paraffin (the material wrapping the paraffin is alumina, the phase-change temperature is 29 ℃, and the average grain diameter is 60um) are respectively 10%, 60% and 30%.
Specific examples of the thermally conductive silicone greases of examples 1 to 4 and comparative examples 1 to 3 are shown in table 1.
TABLE 1 Heat-conducting Silicone greases in various compositions and amounts
Comparison of Experimental data
Comparison test of performance of heat-conducting silicone grease
The results are shown in Table 2 according to the method for measuring thermal conductivity of the non-metallic solid material of GB 10297-88-hot wire method.
TABLE 2 comparison of Heat-conducting Silicone greases Properties
In combination with tables 1 and 2, example 1 and comparative example 1 were compared, and the difference was only that fluorinated graphene nanoplatelets were used in example 1 and graphene was used in comparative example 1. The thermal conductivity of the thermally conductive silicone grease of example 1 was significantly higher than that of comparative example 1, and the thermal resistance was significantly lower than that of comparative example 1. Comparison between example 1 and comparative example 1 shows that the thermal conductivity of the thermal grease is greatly improved by using fluorinated graphene micro-sheets instead of graphene.
Compared with comparative example 2, the differences of examples 1 to 3 are mainly that the weight percentages of the fluorinated graphene micro-sheets, the aluminum oxide and the multi-walled carbon nanotubes are different, and it is obvious that the thermal conductivity coefficient of the thermal conductive silicone grease is obviously higher than that of comparative example 2 and the thermal resistance of the thermal conductive silicone grease is obviously lower than that of comparative example 2 in examples 1 to 3. In addition, compared with comparative example 3, example 4 is different from comparative example 3 in the weight percentage of fluorinated graphene micro-sheets, particulate matters and multi-walled carbon nanotubes, and it is obvious that the thermal conductivity coefficient of the thermal conductive silicone grease is obviously higher than that of comparative example 3 and the thermal resistance is obviously lower than that of comparative example 3 in example 4. The comparison of examples 1 to 3 with comparative example 2, and the comparison of example 4 with comparative example 3, show that the addition of additives in the weight percentage defined in the present invention can greatly improve the heat conductive performance of the heat conductive silicone grease.
Example 5
Contrast test for applying heat-conducting silicone grease to LED heat dissipation
As shown in fig. 1 to 4, the present invention provides a novel lamp lighting assembly for road lighting, comprising: the LED light source comprises a driving power supply 1, a fixed support 2, a rubber ring 3, a level gauge 4, a base 5, an illumination heat sink 7 (the illumination heat sink 7 comprises a first part 701 and a second part 702), a plug 8, an LED light source 9 and a lens 10. The driving power supply 1 and the base 5 are fixedly connected through a screw 6, the base 5 is connected with the fixed support 2, and a rubber ring 3 is arranged in the middle position of the connection between the fixed support 2 and the base 5 and used for sealing connection of the two positions. In addition, although fig. 4 shows the base 5 and the fixed support 2 as separate structures, the two structures may be integrally molded and may be formed as one member, which may be referred to as a support. The fixed support 2 is further connected with a lighting radiator 7, and the plug 8 is installed at the front end of the radiator through screws and used as a front cover. The level is set on the upper part of the base 5, at the position where the base 5 is in contact connection with the driving power source 1. The lens 10 is fixedly installed on the second surface of the first part 701 of the lighting heat sink through screws, the light source 9 is arranged between the lighting heat sink 7 and the lens 10, the first surface of the heat-conducting silicone grease is attached to the second surface of the first part 701 of the lighting heat sink 7, and the second surface of the heat-conducting silicone grease is attached to the light source 9. A fluorine resin composite material containing graphene is sprayed on the entire surface of the semicircular outer surface of the second part 702 of the illumination heat sink 7.
As shown in fig. 1 to 3, the lighting heat sink 7 is a semicircular cylinder, and the semicircular surface is processed into a hollow grid shape, so that the contact area between the lighting heat sink and air is increased, and the heat conduction is further optimized.
The lighting heat sink 7 used in example 5 has a rectangular horizontal longitudinal section with a length of 150mm and a width of 50mm, and a semicircular cross section with a radius of 30mm, and the heat conductive silicone grease used in example 4 was the same.
As shown in fig. 5 and 6, the present invention further provides a street lamp, which includes a lamp housing 110, an LED lighting assembly, a bracket 111 and a reflector 112. The reflector 112 is fixedly mounted in the lamp housing 110 by screws, and a circular opening is provided at the tail of the reflector 112 for the illumination assembly to pass through. The LED lighting assembly is externally connected to the bracket 111, and the bracket 111 is fixed on the lamp housing through screws.
Comparative example 4
Comparative example 4 is different from example 5 in that the heat conductive silicone grease used was the heat conductive silicone grease used in comparative example 3.
Adopt AT4532 high accuracy multichannel temperature tester: the multi-channel temperature tester is an instrument suitable for simultaneously monitoring and tracking multipoint temperatures in real time. The thermocouple testing point measuring device has the advantages of convenience in measurement, high precision and reusability. The whole temperature rise change process can be completely recorded in a curve mode by the aid of software, and storage, analysis and communication are facilitated. The temperature rise testing device is an ideal tool for testing the temperature rise of daily electric products such as electric tools, lighting lamps and the like by manufacturers and quality inspection departments in the industries such as household appliances, motors, electric heating appliances, temperature controllers, transformers, ovens, thermal protectors and the like.
Hot-line method: GB10297-88 method for measuring thermal conductivity of non-metallic solid material. And a thermocouple of the multi-channel temperature tester is connected to the light source chip, the sample is lightened for 120 minutes, and the current temperature is recorded every 10 minutes.
And (3) testing conditions are as follows: ambient temperature: 20 ℃, ambient humidity: 55 percent, COB concentrates light source chips, the power is 30W, the number of the chips is 2, the temperature of the chips is tested, and the results are shown in a table 3.
TABLE 3 comparison of chip temperatures (. degree. C.)
TABLE 3
| Time difference/min | Example 5 | Comparative example 4 |
| 0 | 25 | 25 |
| 10 | 32.2 | 37.3 |
| 20 | 38.5 | 43.3 |
| 30 | 43.6 | 48.1 |
| 40 | 47.1 | 53.0 |
| 50 | 51.3 | 57.2 |
| 60 | 54.8 | 60.9 |
| 70 | 56.9 | 63.7 |
| 80 | 58.6 | 65.8 |
| 90 | 59.5 | 66.3 |
| 100 | 59.7 | 67.4 |
| 110 | 59.7 | 67.8 |
Comparing embodiment 5 with comparative example 4, the heat-conducting silicone grease obtained in embodiment 5 has a high heat absorption rate, the temperature rise of the chip is slow, heat can be timely transferred to the fins through the heat-conducting silicone grease, and the heat-conducting silicone grease has a better heat-conducting effect compared with the heat-conducting silicone grease applied in the earlier stage.
Example 6
The longitudinal dimension of the horizontal rectangle of the heat sink used in example 6 was controlled to be 180mm long and 60mm wide, and the radius of the semicircle of the semi-cylindrical cross section was controlled to be 30mm, and the heat conductive silicone grease used in example 2 was the heat conductive silicone grease used in example 2.
Example 7
TABLE 4
While aspects of the invention have been described above in connection with specific embodiments thereof, the invention is not limited to the specific embodiments and applications described above, which are intended to be illustrative, instructive, and not restrictive. Those skilled in the art, having the benefit of this disclosure, may effect numerous modifications thereto without departing from the scope of the invention as defined by the appended claims.
Claims (12)
1. An illumination heat sink, comprising:
the illumination heat sink includes:
a first component having a planar configuration, the first component having a first surface and a second surface;
a second member having a lattice structure, the second member being attached to the first surface of the first member;
a thermally conductive silicone grease layer having a first surface and a second surface, the first surface of the thermally conductive silicone grease layer being attached to the second surface of the first component, the second surface of the thermally conductive silicone grease layer being in contact with the illumination source;
the heat conductive silicone grease includes: the volume percentage of the silicone oil and the additive is 40-60% of the additive and 40-60% of the silicone oil, and the volume percentage is based on the total volume of the heat-conducting silicone grease; wherein the additive comprises fluorinated graphene;
the additive further comprises multi-walled carbon nanotubes and a metal oxide filler; the additive comprises 25-35% of multi-walled carbon nanotubes, 20-30% of fluorinated graphene and 45-55% of metal oxide filler by mass, wherein the mass percentages are based on the total mass of the additive.
2. The lighting heatsink of claim 1, wherein the fluorinated graphene has a micro-platelet structure.
3. The lighting heatsink of claim 1, wherein the fluorinated graphene nanoplatelets are 5-18 nanometers thick.
4. The lighting heatsink of claim 1, wherein the fluorinated graphene nanoplatelets are 6 to 9 microns in diameter.
5. The lighting heatsink of claim 1, wherein the fluorinated graphene density is 0.15 to 0.30g/cm3。
6. The lighting heatsink of claim 1, wherein the metal element of the metal oxide filler is selected from at least one of tin, rare earth elements, zinc, aluminum, calcium, platinum, silver.
7. The lighting heatsink of claim 1, wherein the metal oxide filler is alumina or alumina-coated paraffin capsules.
8. The lighting heatsink of claim 1 wherein the metal oxide filler has a particle size of 1 to 100 microns.
9. The lighting heatsink of claim 1 wherein the first component is made of a metal, metal oxide or ceramic and the second component is selected from a metal, metal oxide or ceramic.
10. The lighting heatsink of claim 1, wherein the heatsink second-component grid structure surface is spray-coated with a fluororesin comprising graphene.
11. An LED lighting assembly, characterized by:
the lighting assembly includes:
the lighting heatsink of any one of claims 1 to 10;
and the LED light source is attached to the second surface of the heat conduction silicone layer of the lighting radiator.
12. The lighting assembly as set forth in claim 11,
wherein the lighting assembly further comprises: the device comprises a driving power supply, a fixed support and a base;
the driving power supply is connected with the base, the base is connected with the fixed support, and the fixed support fixes the lighting radiator.
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