WO2018094750A1 - 一种高效散热的相变led灯导热柱及其散热结构 - Google Patents

一种高效散热的相变led灯导热柱及其散热结构 Download PDF

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WO2018094750A1
WO2018094750A1 PCT/CN2016/107844 CN2016107844W WO2018094750A1 WO 2018094750 A1 WO2018094750 A1 WO 2018094750A1 CN 2016107844 W CN2016107844 W CN 2016107844W WO 2018094750 A1 WO2018094750 A1 WO 2018094750A1
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heat dissipation
parts
graphene
phase change
heat
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PCT/CN2016/107844
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English (en)
French (fr)
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陈达
季浩
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浩雄电气有限公司
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B25/00—Phosphorus; Compounds thereof
    • C01B25/16—Oxyacids of phosphorus; Salts thereof
    • C01B25/26—Phosphates
    • C01B25/32—Phosphates of magnesium, calcium, strontium, or barium
    • 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
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/04—Acids; Metal salts or ammonium salts thereof
    • C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
    • 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
    • F21V29/50—Cooling arrangements
    • F21V29/56—Cooling arrangements using liquid coolants
    • 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

Definitions

  • the invention relates to a lamp, and more particularly to a heat dissipation structure of a phase change LED lamp with high heat dissipation.
  • the Chinese patent application No. 201610034907.9 discloses an efficient heat-dissipating LED floodlight, comprising a casing, an LED lamp is arranged in the casing, and a radiator is arranged in the casing.
  • the LED lamp is attached to the heat sink, and the heat sink is provided with a receiving cavity.
  • the receiving cavity is filled with a phase change liquid, and two ends of the heat sink receiving cavity are provided with a heat pipe.
  • the phase change liquid will leave the position of the heat sink attached to the LED lamp.
  • the LED lamp emits heat during the use of the LED lamp. Since the heat pipe is disposed on the heat sink, the heat pipe is indirectly transmitted.
  • the effect of heat is to transfer the heat of the LED lamp to the phase change liquid through the heat pipe, thereby causing the phase change liquid to undergo a phase change, which enables a better heat dissipation effect even during tilting use, improving the overall
  • the heat dissipation performance ensures the long-term use of the LED lamp.
  • the object of the present invention is to provide a heat conducting column capable of achieving efficient heat dissipation by performing 360-degree adjustment.
  • the present invention provides the following technical solutions:
  • a heat-conducting column for phase-change LED lamps with high heat dissipation comprising a water absorbing layer, the water absorbing layer is coated with a carbon fiber layer, and the carbon fiber layer is coated with a graphene layer.
  • the graphene layer is provided with a vent hole.
  • the water absorbing layer is a water absorbing cotton core or a polymer water absorbing resin.
  • the graphene layer is graphene paper.
  • the carbon fiber layer is a carbon fiber cloth.
  • a heat dissipation structure capable of achieving efficient heat dissipation by performing 360-degree omnidirectional adjustment, including a heat dissipation cavity filled with a phase change liquid, the heat dissipation cavity A heat conducting column is disposed inside, and the heat conducting column is in contact with the phase change liquid.
  • the invention includes a shingle and a bottom plate disposed at two openings of the shroud, wherein one of the bottom plates is fitted with an LED lamp, the shingle and the two bottom plates form a heat dissipating cavity, and the heat conducting column is fixedly attached On the bottom plate with LED lights.
  • the heat conducting column is provided with a bent plate which is fitted to the bottom plate, and the bottom plate is provided with a holding plate which is sandwiched between the holding plate and the bottom plate.
  • the clamping plate is provided with a first mounting hole
  • the bottom plate is provided with a threaded hole
  • the bending plate is provided with a second mounting hole
  • the first mounting hole The second mounting hole and the threaded hole are simultaneously provided with only fixing bolts.
  • the phase change liquid accounts for 15 to 40% of the entire accommodating chamber.
  • the high molecular water absorbing resin comprises the following parts by weight:
  • the modified graphene paper is prepared by the following steps:
  • the graphene is added to a concentration of 30% hydrogen peroxide for pre-oxidation, and placed in a water bath, maintained at a temperature of 80 ° C for 5 hours, added with 5% concentration of sodium peroxide, diluted with hydrogen peroxide to less than 5%
  • the concentration is kept in a water bath for 1 hour, filtered, and the filtered graphene is added to a 10% concentration of ketomalonic acid for 30 minutes, and then filtered, and then the filtered pre-oxidized graphene is washed with deionized water and dried;
  • the pre-oxidized graphene is placed in a tube furnace and protected by nitrogen until the air used in the tube furnace is removed, and the temperature is raised to 500 ° C, then the nitrogen is replaced with carbon dioxide, and the temperature is maintained for 2 hours, after which the carbon dioxide is replaced. Nitrogen gas is cooled to room temperature to obtain graphene oxide;
  • Step 4 100 parts by mass of the above-mentioned dried modified graphene powder and 5 parts of molybdenum silicide are added to a mold, and molded at 5 MPa and 200 ° C for 5 to 30 minutes to obtain a graphene paper.
  • the heat-conducting column is located in the heat-dissipating cavity and is in contact with the phase change liquid in the heat-dissipating cavity.
  • the heat-conducting column since the intermediate water-absorbing layer is provided to absorb the liquid, the use of the heat-absorbing layer can be made in use.
  • the heat-conducting column is immersed in the entire phase change liquid, so that the phase change liquid can be sucked into the middle of the entire heat-conducting column, and the principle is similar to the wick of the alcohol lamp and the kerosene lamp.
  • heat is generated and transferred to the heat dissipation cavity, which causes the heat dissipation cavity to heat up.
  • phase change liquid located in the heat dissipation chamber and the phase change liquid sucked up by the water absorption layer will volatilize, and the evaporation of the phase change liquid can provide a better heat dissipation effect.
  • the phase change liquid sucked into the water absorbing layer can be absorbed into the water absorbing layer in the water absorbing layer by rotating at any angle due to the capillary force of the water absorbing layer.
  • a carbon fiber is coated on the outer layer of the water absorption layer, and the carbon fiber has good water absorption property, and also has good thermal conductivity, and can conduct heat while absorbing water, thereby volatilizing the phase change liquid located in the water absorbing layer, thereby Heat transfer and heat dissipation.
  • the graphene layer is coated on the outermost side of the heat-conducting column, mainly for heat transfer, and the graphene layer as the outermost layer can provide a better heat transfer effect and effectively transfer heat.
  • the graphene layer acts as a heat transfer
  • the carbon fiber layer takes care of both water absorption and heat transfer
  • the inner water absorbing layer is mainly It absorbs water, so that it can ensure that the heat is not lost. If there is no carbon fiber layer, the graphene itself has poor water absorption and can only transfer heat through contact, and most of the heat is transferred to the water absorbing layer.
  • the carbon fiber layer is arranged so that a large amount of heat is transferred to the carbon fiber, and the carbon fiber itself has a phase change liquid, and the phase change liquid can mutually transfer heat, greatly improving Heat transfer efficiency, while also improving heat dissipation efficiency, effectively improve The heat dissipation effect is 30% to 80%.
  • Figure 1 is an overall structural view of the embodiment
  • FIG. 2 is a structural view of a heat conducting column of the embodiment
  • FIG. 3 is a schematic view showing the vent hole of the heat conducting column of the embodiment.
  • a heat-conducting phase change LED lamp 15 of the present embodiment uses a heat-conducting column 1 including a water-absorbing layer 2, and the water-absorbing layer 2 is externally coated with a carbon fiber layer 3, and the carbon fiber layer 3 The graphene layer 4 is overcoated.
  • the graphene layer 4 is provided with a vent hole 5.
  • the water absorbing layer 2 is a water absorbing cotton core or a polymer water absorbing resin.
  • Absorbent cotton core and high molecular weight water absorbing resin are widely used as common water absorbing materials. Easy to obtain, at a lower cost.
  • the graphene layer 4 is graphene paper.
  • the carbon fiber layer 3 is a carbon fiber cloth.
  • a heat dissipation structure capable of efficiently dissipating heat in a 360-degree omnidirectional adjustment, comprising a louver 7 and a bottom plate 8 disposed at two openings of the louver 7, wherein one of the bottom plates is fitted with an LED lamp 15
  • the shroud 7 and the two bottom plates 8 form a heat dissipation cavity 6 which is fixed to the bottom plate 8 to which the LED lamp 15 is attached.
  • a shroud 7 and a bottom plate 8 disposed at two openings of the shroud 7 are formed.
  • the shroud 7 and the two bottom plates 8 form a heat dissipation cavity 6, and the heat conducting column 1 is fixed to the bottom plate 8. on.
  • the heat conducting column 1 is provided with a bend that is attached to the bottom plate 8
  • the plate 9 is provided with a holding plate 10 on the bottom plate 8, and the bent plate 9 is sandwiched between the holding plate 10 and the bottom plate 8.
  • the clamping plate 10 is provided with a first mounting hole 11
  • the bottom plate 8 is provided with a threaded hole 13
  • the bending plate 9 is provided with a second mounting hole 12.
  • the first mounting hole 11, the second mounting hole 12, and the threaded hole 13 are simultaneously provided with only the fixing bolts 14.
  • the phase change liquid accounts for 15 to 40% of the entire receiving chamber.
  • the heat-conducting column 1 is located in the heat-dissipating cavity 6, and is in contact with the phase change liquid in the heat-dissipating cavity 6.
  • the intermediate water-absorbing layer 2 is provided to absorb liquid, it can be made
  • the heat-conducting column 1 is immersed in the entire phase change liquid, so that the phase change liquid can be sucked into the middle of the entire heat-conducting column 1, the principle is similar to that of the alcohol lamp 15, the lamp 15 of the kerosene lamp 15.
  • heat is generated and transferred to the heat dissipation chamber 6, which causes the heat dissipation chamber 6 to heat up.
  • phase change liquid located in the heat dissipation chamber 6 and the phase change liquid sucked up by the water absorption layer 2 will volatilize, and the evaporation of the phase change liquid can provide a better heat dissipation effect.
  • the phase change liquid sucked into the water absorbing layer 2 can be absorbed into the water absorbing layer 2 in the water absorbing layer 2 by the rotation of the absorbing layer 2 by the capillary force of the water absorbing layer 2.
  • a carbon fiber is coated on the outer layer of the water absorbing layer 2, and the carbon fiber has good water absorption property, and also has good thermal conductivity, and can conduct heat while absorbing water, thereby volatilizing the phase change liquid located in the water absorbing layer 2, thereby It has a heat transfer and heat dissipation effect.
  • the graphene layer 4 is coated on the outermost side of the heat-conducting column 1, mainly for heat transfer, and the graphene layer 4 serves as the outermost side to provide a good heat transfer effect and efficiently transfer heat.
  • the inner water absorbing layer 2 mainly serves to absorb water, so that the heat can be prevented from being lost to the utmost extent, such as If there is no carbon fiber layer 3, the graphene itself has poor water absorption and can only transfer heat through contact, and most of the heat is transferred to the water absorbing layer 2 instead of directly transferring heat to the phase change liquid, and the carbon fiber layer
  • the setting of 3 can make a large amount of heat transfer to the carbon fiber, the carbon fiber itself has a phase change liquid, the phase change liquid can mutually transfer heat, greatly improve the heat transfer efficiency, and also improve the heat dissipation efficiency.
  • venting holes 5 When the heat is heated, the passage for the heat dissipation and evaporation is provided, so that the passage of the gas after the phase change is more, and the passage of the phase surface also enters the water absorbing layer 2, thereby further improving the heat dissipation. effectiveness.
  • the arrangement of the venting holes 5 also provides an expansion space for the water absorbing layer and the carbon fiber layer.
  • Graphene paper and carbon fiber cloth are easy to form and easy to shape and process.
  • the LED lamp 15 When used as the LED lamp 15, the LED lamp 15 is mounted on the bottom plate 8, and the heat on the LED lamp 15 is directly radiated to the bottom plate 8, and heat is transferred to the inside of the heat dissipation chamber 6 by heat transfer from the bottom plate 8.
  • One end of the heat conducting column 1 is connected to the mounting plate on which the LED lamp 15 is mounted, so that the fastest time can be contacted with the heat source, thereby functioning as a heat conduction and a phase change.
  • the bent plate 9 is first placed on the bottom plate 8, and then placed in the holding plate 10, and the bolts 14 are directly screwed by aligning the first mounting hole 11, the second mounting hole 12, and the screw hole 13
  • the fixing can be completed to achieve the entire installation structure.
  • Such a sub-installation structure is relatively stable and convenient for processing operations.
  • an embodiment of a polymer water absorbing resin for a water absorbing layer is provided:
  • the water absorbing resin comprises the following parts by weight:
  • acrylic acid and 2-hydroxyethyl acrylate are mainly used, and sodium hydroxide equivalent to the mass of acrylic acid is added for neutralization before the reaction, and after completion of the neutralization, tetrakis (2-hydroxyl) is added.
  • tetrakis(2-hydroxyethyl)adipamide, 4-methylbenzamide, and N-[4-(sulfonamide)phenyl]acrylamide can be used after completion of crosslinking.
  • the water-repellent active group is provided on the surface of the crosslinked polymer, so that the overall water absorption effect can be greatly improved.
  • tetrakis(2-hydroxyethyl)adipamide, 4-methylbenzamide, N-[4-(sulfonamide)phenyl]acrylamide have a group in which the acrylic resin has a relatively high cross-linking. Good compatibility makes the mixing very uniform and the final water absorption performance is more uniform and stable.
  • the acrylamide added at the same time can adjust the overall molecular structure, so that the acrylic resin has good stability, is easy to form, is not too soft to be formed, and has a group which can promote the overall water absorption performance.
  • triallyl phosphate promotes the fluidity between the raw materials in the molten state on the one hand, At the same time, the water absorption performance of the polypropylene resin is further improved.
  • potassium persulfate acts as an initiator for the entire reaction, allowing the entire reaction to take place.
  • Sodium 2,3-dihydroxynaphthalene-6-sulfonate is added as a modifier to be capable of reacting with tetrakis(2-hydroxyethyl)adipamide, 4-methylbenzamide, N-[4-(sulfonamide) Phenyl]acrylamide produces a synergistic effect on the one hand to reinforce the overall material and, on the other hand, to improve water absorption.
  • the water absorbing resin comprises the following parts by weight:
  • the water absorbing resin comprises the following parts by weight:
  • the water absorbing resin comprises the following parts by weight:
  • the amount of water absorption (g/g) was determined.
  • a beaker having a volume of 100 mL of the volume, 50 g of 0.9% by weight physiological saline was placed in advance, the liquid temperature was adjusted to 25 ° C, and the mixture was stirred at a speed of 600 rpm using a stirrer (length 30 mm, diameter 8 mm). 2 g of water-absorbent resin particles were added to the beaker while stirring, and the time required for the water-absorbent resin particles to disappear by the gelation to cause the vortex on the liquid surface to disappear was measured, and this time was the water absorption speed.
  • modified graphene paper As a further improvement of the method, an embodiment of modified graphene paper is also provided:
  • the graphene is added to a concentration of 30% hydrogen peroxide for pre-oxidation, and placed in a water bath, maintained at a temperature of 80 ° C for 5 hours, added with 5% concentration of sodium peroxide, diluted with hydrogen peroxide to less than 5% Concentration, soaked in a water bath for 1 hour, filtered, filtered graphene added to 10% concentration of ketopropionic acid soaked Filtration after 30 minutes, then rinsing the filtered pre-oxidized graphene with deionized water and drying;
  • the pre-oxidized graphene is placed in a tube furnace and protected by nitrogen until the air used in the tube furnace is removed, and the temperature is raised to 500 ° C, then the nitrogen is replaced with carbon dioxide, and the temperature is maintained for 2 hours, after which the carbon dioxide is replaced. Nitrogen gas is cooled to room temperature to obtain graphene oxide;
  • Step 4 100 parts by mass of the above-mentioned dried modified graphene powder and 5 parts of molybdenum silicide are added to a mold, and molded at 5 MPa and 200 ° C for 5 to 30 minutes to obtain a graphene paper.
  • the graphene is the main body, firstly preoxidized by hydrogen peroxide, so that the surface area of the graphene is increased and the active group is present, and after the pre-oxidation, the sodium peroxide solution is added for dilution.
  • the oxidative activity can be gradually reduced gradually, ensuring that no hydrogen peroxide remains in the gap of the graphene during the subsequent cleaning process, and then the immersion cleaning by the keto-malonic acid can effectively remove the residual pre-oxidation solution. It can be guaranteed that it will not be affected by the pre-oxidation during the subsequent oxidation of carbon dioxide.
  • the surface of graphene is mainly sintered by gas at a high temperature.
  • carbon dioxide is generally directly oxidized.
  • the oxidation area after carbon dioxide sintering does not increase. Big. If chemical oxidation is used directly, the uniformity of oxidation is difficult to control. However, it is easy to leave the pre-oxidation liquid in the pre-oxidation process.
  • the pre-oxidation process of the present invention can first increase the surface area of the graphene before the carbon dioxide is sintered, and then pass through the carbon dioxide sintering, so that the structure of the graphene oxide can be made more uniform.
  • the active group can be supported on the surface of the graphene oxide by the addition of (methoxymethyl)trimethylsilane, triacetoxyethylsilane or N-methylpyrrolidone, and the (methoxy group)
  • the methyl)trimethylsilane and triacetoxyethylsilane reactive groups are introduced and reacted with the N-methylpyrrolidone by the introduced reactive group and crosslinked with it.
  • the addition of molybdenum silicide in the molding step can occasionally promote more complete cross-linking between the modified graphene, and molybdenum silicide is used as a catalyst to form graphene paper in a short time, and at the same time, the graphene paper is better.
  • the mechanical strength can occasionally promote more complete cross-linking between the modified graphene, and molybdenum silicide is used as a catalyst to form graphene paper in a short time, and at the same time, the graphene paper is better.
  • the mechanical strength is used to promote more complete cross-linking between the modified graphene, and molybdenum silicide is used as a catalyst to form graphene paper in a short time, and at the same time, the graphene paper is better.
  • the bottom area of the heat dissipation cavity is a circle with a radius of 5 cm, the heat dissipation cavity height is 20 cm, the heat dissipation cavity is filled with a phase change liquid of 40% solvent, and the phase change liquid is selected from ethanol.
  • the hollow copper tube is selected as a whole for a heat conducting column.
  • a hollow cylinder with a diameter of 0.5 cm is selected, and six are arranged, and the bottom surface of the heat-dissipating cavity is distributed in a circular equidistant array, and the distance from the center of the cylinder is 2.5 cm.
  • Test Temperature of the first embodiment, the second embodiment, the third embodiment, and the first comparative example and the second comparative example of the phase change liquid when the LED lamp is turned on.

Abstract

一种高效散热的相变LED灯（15）用导热柱（1）及散热结构，导热柱（1）包括吸水层（2），吸水层（2）外包覆有碳纤维层（3），碳纤维层（3）外包覆有石墨烯层（4）；散热结构包括散热腔（6），散热腔（6）内填充有相变液，散热腔（6）内设置有导热柱（1），导热柱（1）与相变液接触。被吸至吸水层（2）中的相变液，由于吸水层（2）毛细力的作用，能够起到在任意角度转动都能够保证相变液被吸收到吸水层（2）中；之后在吸水层（2）外包覆一层碳纤维，碳纤维具有较好的吸水性的同时，还具有较好的导热性，能够一边吸水一边导热，从而将位于吸水层（2）中的相变液挥发，起到传热散热效果，有效提高散热效果30％～80％。

Description

一种高效散热的相变LED灯导热柱及其散热结构 技术领域
本发明涉及一种灯具，更具体的说是涉及一种高效散热的相变LED灯散热结构。
背景技术
在现有技术中，申请号为201610034907.9的中国专利，公开了一种高效散热LED泛光灯，包括壳体，所述壳体内设置有LED灯，所述壳体内还设置有散热器，所述LED灯与散热器贴合，所述散热器内设置有容纳腔，所述容纳腔内填充有相变液，所述散热器容纳腔内两端设置有导热管。当在倾斜使用时，相变液会离开贴合LED灯的散热器的位置，此时LED灯使用过程中，LED灯散发出热量，由于散热器上设置了导热管，导热管起到了间接传热的效果，通过导热管将LED灯的热量传递到相变液中，从而使得相变液发生相变，这样就使得即使在倾斜使用过程中也能够起到一个较好的散热效果，提高整体的散热性能，保证了LED灯的长时间使用。
但是，当发生大幅度倾斜过程中，会存在部分导热管无法实现接触到相变液的情况，无法实现三百六十度全方位调整后都能够达到较好的散热效果。
发明内容
针对现有技术存在的不足，本发明的目的在于提供一种实现三百六十度全方位调整均能起到高效散热的导热柱。
为实现上述目的，本发明提供了如下技术方案：
一种高效散热的相变LED灯用导热柱：包括吸水层，所述吸水层外包覆有碳纤维层，所述碳纤维层外包覆有石墨烯层。
作为本发明的进一步改进：所述石墨烯层上设置有透气孔。
作为本发明的进一步改进：所述吸水层为吸水棉芯或高分子吸水树脂。
作为本发明的进一步改进：所述石墨烯层为石墨烯纸。
作为本发明的进一步改进：所述碳纤维层为碳纤维布。
作为本发明的另一发明目的，提供一种实现三百六十度全方位调整均能起到高效散热的散热结构，包括散热腔，所述散热腔内填充有相变液，所述散热腔内设置有导热柱，导热柱与相变液接触。
作为本发明的进一步改进：包括围板以及设置在围板两个开口处的底板，其中一块底板贴合有LED灯，所述围板和两底板形成散热腔，所述导热柱固定在贴合有LED灯的底板上。
作为本发明的进一步改进：所述导热柱上设置有与底板贴合的弯折板，所述底板上设置有夹持板，所述弯折板被夹持在夹持板和底板之间。
作为本发明的进一步改进：所述夹持板上设置有第一安装孔，所述底板上设置有螺纹孔，所述所述弯折板上设置有第二安装孔，所述第一安装孔、第二安装孔、螺纹孔中同时穿设只有固定螺栓。
作为本发明的进一步改进：所述相变液占整个容纳腔的15～40％。
作为本发明的进一步改进：
所述高分子吸水树脂包括下列重量份组成:
丙烯酸200份
丙烯酸-2-羟乙酯100份
四(2-羟乙基)己二酰胺5份
4-甲基苯甲酰胺2份
N-[4-(磺酰胺)苯基]丙烯酰胺2份
过硫酸钾1份
丙烯酰胺30份
三烯丙基磷酸酯3份
2,3-二羟基萘-6-磺酸钠：5份。
制备步骤如下：
(1)按配方量将氢氧化钠加入丙烯酸中使其中和；
(2)将丙烯酰胺与中和后的丙烯酸溶液配制成水溶液，加入丙烯酸-2-羟乙酯和剩余助剂，搅拌均匀，在70℃下聚合反应5小时，得到聚合物；
(3)将聚合物经造粒、烘干、粉碎后，制得高吸水树脂。
作为本发明的进一步改进：
所述改性石墨烯纸有下列步骤制备：
步骤一：预氧化
将石墨烯加入到浓度为30％的双氧水中进行预氧化，同时置于水浴锅中，保持温度在80℃预氧化5小时，加入5％浓度的过氧化钠，将双氧水稀释至小于5％的浓度，在水浴中保温1小时，过滤，过滤后的石墨烯加入10％浓度的酮丙二酸浸泡至30分钟后过滤，之后用去离子水冲洗过滤的到预氧化石墨烯，烘干；
步骤二：
将预氧化石墨烯置于管式炉中，通入氮气保护，直至除去管式炉内的所用空气，同时升温至500℃，之后将氮气换成二氧化碳，保温2小时，之后再将二氧化碳置换成氮气降温至室温，得到氧化石墨烯；
步骤三：
取质量分200份氧化石墨烯，加入1.5份(甲氧基甲基)三甲基硅烷、1份三乙酰氧基乙基硅烷，同时加入N-甲基吡咯烷酮100份，在80℃，1.5MPa下反应1小时，得到改性石墨烯；
步骤四：将100质量份上述干燥后的改性石墨烯粉、5份硅化钼加入到模具中，在5MPa、200℃条件下，模压5～30分钟，得到的石墨烯纸。
本发明的有益效果在于：
在使用过程中，导热柱是位于散热腔中的，与散热腔中的相变液接触，导热柱使用过程中，由于中间吸水层的设置有能够吸收液体，这样就可以使得在使用过程中，导热柱是浸入到整个相变液中的，这样就可以把相变液吸到整个导热柱的中间，原理类似于酒精灯、煤油灯的灯芯。在LED灯正常使用过程中，产生热量，会传到散热腔中，这样会使得散热腔升温。在升温后，位于散热腔中的相变液以及被吸水层吸上来的相变液都会挥发，通过相变液的蒸发，能够起到一个较好的散热效果。特别是被吸至吸水层中的相变液，由于吸水层毛细力的作用下，能够起到在任意角度转动都能够保证吸水层中能够吸收到吸水层中。之后在吸水层外包覆一层碳纤维，碳纤维具有较好的吸水性的同时，还具有较好的导热性，能够一边吸水一边导热，从而将位于吸水层中的相变液挥发，从而起到传热散热效果。
在导热柱的最外侧包覆有石墨烯层，主要是起到传热作用，石墨烯层的作为最外侧能够起到较好的传热效果，有效传到热量。
最终，热量通过石墨烯层、碳纤维层进入到吸水层中，将相变液蒸发，通过循序渐进的传热方式，石墨烯层起到传热，碳纤维层兼顾吸水和传热，内部的吸水层主要起到吸水作用，这样就能够最大限度保证热量不会损耗，如果没有碳纤维层的设置，石墨烯本身吸水性较差，只能通过接触传热，而大部分热量会传递到吸水层上，而不是直接与相变液进行直接传热，而碳纤维层的设置恰恰就能够使得大量热量在传递到碳纤维时，碳纤维本身就带有相变液，相变液之间就能够相互传热，大大提高的传热效率，同时也提高了散热效率，有效提高 散热效果30％～80％。
附图说明
图1为本实施例的整体结构图；
图2为本实施例的导热柱结构图；
图3为本实施例的导热柱透气孔示意图。
具体实施方式
下面将结合附图所给出的实施例对本发明做进一步的详述。
参照图1至3所示，本实施例的一种高效散热的相变LED灯15用导热柱1：包括吸水层2，所述吸水层2外包覆有碳纤维层3，所述碳纤维层3外包覆有石墨烯层4。
作为改进的一种具体实施方式，所述石墨烯层4上设置有透气孔5。
作为改进的一种具体实施方式，所述吸水层2为吸水棉芯或高分子吸水树脂。
吸水棉芯和高分子吸水树脂作为常见的吸水材料被广泛应用。容易获得，同时成本较低。
作为改进的一种具体实施方式，所述石墨烯层4为石墨烯纸。
作为改进的一种具体实施方式，所述碳纤维层3为碳纤维布。
一种实现三百六十度全方位调整均能起到高效散热的散热结构，包括围板7以及设置在围板7两个开口处的底板8，其中一块底板贴合有LED灯15，所述围板7和两底板8形成散热腔6，所述导热柱1固定在贴合有LED灯15的底板8上。
作为改进的一种具体实施方式，包括围板7以及设置在围板7两个开口处的底板8，所述围板7和两底板8形成散热腔6，所述导热柱1固定在底板8上。
作为改进的一种具体实施方式，所述导热柱1上设置有与底板8贴合的弯折 板9，所述底板8上设置有夹持板10，所述弯折板9被夹持在夹持板10和底板8之间。
作为改进的一种具体实施方式，所述夹持板10上设置有第一安装孔11，所述底板8上设置有螺纹孔13，所述所述弯折板9上设置有第二安装孔12，所述第一安装孔11、第二安装孔12、螺纹孔13中同时穿设只有固定螺栓14。
作为改进的一种具体实施方式，所述相变液占整个容纳腔的15～40％。
本发明的有益效果在于：
在使用过程中，导热柱1是位于散热腔6中的，与散热腔6中的相变液接触，导热柱1使用过程中，由于中间吸水层2的设置有能够吸收液体，这样就可以使得在使用过程中，导热柱1是浸入到整个相变液中的，这样就可以把相变液吸到整个导热柱1的中间，原理类似于酒精灯15、煤油灯15的灯15芯。在LED灯15正常使用过程中，产生热量，会传到散热腔6中，这样会使得散热腔6升温。在升温后，位于散热腔6中的相变液以及被吸水层2吸上来的相变液都会挥发，通过相变液的蒸发，能够起到一个较好的散热效果。特别是被吸至吸水层2中的相变液，由于吸水层2毛细力的作用下，能够起到在任意角度转动都能够保证吸水层2中能够吸收到吸水层2中。之后在吸水层2外包覆一层碳纤维，碳纤维具有较好的吸水性的同时，还具有较好的导热性，能够一边吸水一边导热，从而将位于吸水层2中的相变液挥发，从而起到传热散热效果。
在导热柱1的最外侧包覆有石墨烯层4，主要是起到传热作用，石墨烯层4的作为最外侧能够起到较好的传热效果，有效传到热量。
最终，热量通过石墨烯层4、碳纤维层3进入到吸水层2中，将相变液蒸发，通过循序渐进的传热方式，石墨烯层4起到传热，碳纤维层3兼顾吸水和传热，内部的吸水层2主要起到吸水作用，这样就能够最大限度保证热量不会损耗，如 果没有碳纤维层3的设置，石墨烯本身吸水性较差，只能通过接触传热，而大部分热量会传递到吸水层2上，而不是直接与相变液进行直接传热，而碳纤维层3的设置恰恰就能够使得大量热量在传递到碳纤维时，碳纤维本身就带有相变液，相变液之间就能够相互传热，大大提高的传热效率，同时也提高了散热效率。
通过透气孔5的设置，在受热的时候，提供散热挥发出去的通道，使得相变后气体散发出去的通道更多，同时也增加了相面也进入到吸水层2的通道，进一步提高了散热效率。同时，透气孔5的设置，也提供了吸水层和碳纤维层的膨胀空间。
石墨烯纸和碳纤维布容易成型，易于成型和加工。
在作为LED灯15使用的时候，LED灯15安装在底板8上，LED灯15上的热量直接散发到底板8上，通过底板8的传热，将热量传导到散热腔6内部。导热柱1一端与安装LED灯15的安装板连接，这样就可以使先最快时间与热源接触，从而起到导热、相变的作用。
在安装过程中，首先将弯折板9放置在底板8上，之后放入夹持板10，通过将第一安装孔11、第二安装孔12、螺纹孔13对准后直接拧入螺栓14即可完成固定，实现整个安装结构。这样子安装结构比较稳定，方便加工操作。
作为改进的一种具体实施方式，提供一种用于吸水层的高分子吸水树脂的实施例：
该吸水树脂包括下列重量份组成:
丙烯酸200份
丙烯酸-2-羟乙酯100份
四(2-羟乙基)己二酰胺5份
4-甲基苯甲酰胺2份
N-[4-(磺酰胺)苯基]丙烯酰胺2份
过硫酸钾1份
丙烯酰胺30份
三烯丙基磷酸酯3份
2,3-二羟基萘-6-磺酸钠：5份。
制备步骤如下：
(1)按配方量将氢氧化钠加入丙烯酸中使其中和；
(2)将丙烯酰胺与中和后的丙烯酸溶液配制成水溶液，加入丙烯酸-2-羟乙酯和剩余助剂，搅拌均匀，在70℃下聚合反应5小时，得到聚合物；
(3)将聚合物经造粒、烘干、粉碎后，制得高吸水树脂。
在上述高分子吸水树脂中，以丙烯酸和丙烯酸-2-羟乙酯为主体，在反应前加入与丙烯酸相等物质量的氢氧化钠进行中和，在完成中和后，加入四(2-羟乙基)己二酰胺、4-甲基苯甲酰胺、N-[4-(磺酰胺)苯基]丙烯酰胺作为交联剂，使得在反应过程中，能够以丙烯酸为基体，形成三维网状结构，同时四(2-羟乙基)己二酰胺、4-甲基苯甲酰胺、N-[4-(磺酰胺)苯基]丙烯酰胺的复配使用，能够在完成交联的后，使得在交联的聚合物表面带有吸水性的活性基团，这样就能够大幅度提高整体的吸水效果。同时四(2-羟乙基)己二酰胺、4-甲基苯甲酰胺、N-[4-(磺酰胺)苯基]丙烯酰胺带有的基团在于丙烯酸树脂在交联时，具有较好的相容性，使得在混合能够十分均匀，最后吸水性能上能够更加均匀和稳定。同时加入的丙烯酰胺能够调节整体分子结构，使得丙烯酸树脂具有较好的稳定性，易于成型，不会太软而无法成型，同时本身带有的基团能够促进整体的吸水性能的提升。
三烯丙基磷酸酯的加入，一方面促进在反应过程中熔融状态原料之间的流动性， 同时进一步提高聚丙烯树脂的吸水性能。
过硫酸钾的加入则作为整个反应的引发剂，使得整个反应得以发生。
2,3-二羟基萘-6-磺酸钠作为改性剂加入，能够与四(2-羟乙基)己二酰胺、4-甲基苯甲酰胺、N-[4-(磺酰胺)苯基]丙烯酰胺产生协同作用，一方面对整体材料起到了补强作用，另一方面，还能够提高吸水性能。
吸水树脂对比例一：
该吸水树脂包括下列重量份组成:
丙烯酸200份
过硫酸钾1份
丙烯酰胺30份
制备步骤如下：
(1)按配方量将氢氧化钠加入丙烯酸中使其中和；
(2)将丙烯酰胺与中和后的丙烯酸溶液配制成水溶液，剩余助剂，搅拌均匀，在70℃下聚合反应5小时，得到聚合物；
(3)将聚合物经造粒、烘干、粉碎后，制得高吸水树脂。
吸水树脂对比例二：
该吸水树脂包括下列重量份组成:
丙烯酸200份
丙烯酸-2-羟乙酯100份
四(2-羟乙基)己二酰胺5份
4-甲基苯甲酰胺2份
N-[4-(磺酰胺)苯基]丙烯酰胺2份
过硫酸钾1份
丙烯酰胺30份；
制备步骤如下：
(1)按配方量将氢氧化钠加入丙烯酸中使其中和；
(2)将丙烯酰胺与中和后的丙烯酸溶液配制成水溶液，加入丙烯酸-2-羟乙酯和剩余助剂，搅拌均匀，在70℃下聚合反应5小时，得到聚合物；
(3)将聚合物经造粒、烘干、粉碎后，制得高吸水树脂。
吸水树脂对比例三：
该吸水树脂包括下列重量份组成:
丙烯酸200份
丙烯酸-2-羟乙酯100份
四(2-羟乙基)己二酰胺5份
4-甲基苯甲酰胺2份
N-[4-(磺酰胺)苯基]丙烯酰胺2份
过硫酸钾1份
丙烯酰胺30份。
制备步骤如下：
(1)按配方量将氢氧化钠加入丙烯酸中使其中和；
(2)将丙烯酰胺与中和后的丙烯酸溶液配制成水溶液，加入丙烯酸-2-羟乙酯和剩余助剂，搅拌均匀，在70℃下聚合反应5小时，得到聚合物；
(3)将聚合物经造粒、烘干、粉碎后，制得高吸水树脂。
高吸水树脂测试：
(1)吸水量
在2000mL容积的烧杯中，将吸水性树脂粒子0.5g分散在离子交换水1500g中，搅拌30分钟使其充分膨润。使用事先测定了重量Wa(g)的网眼38μm(400目)的标准筛，过滤包含膨润凝胶的离子交换水，倾斜筛，使其以相对于水平成约30度左右的倾斜角的状态放置30分钟，从膨润凝胶中除去剩余水分。之后，测定包含膨润凝胶的筛的重量Wb(g)，根据式：
〔吸水量(g/g)〕＝(Wb-Wa)÷0.5
求出吸水量(g/g)。
(2)吸水速度
往内容积100mL容积的烧杯中，事先放入0.9重量％生理盐水50g，将液温调节到25℃，使用搅拌器(长30mm、直径8mm)，以转数600rpm的速度进行搅拌。边搅拌边在该烧杯内加入吸水性树脂粒子2g，测量吸水性树脂粒子通过凝胶化而使液表面的漩涡消失为止所需的时间，该时间为吸水速度。
  吸水率(g/g) 吸水速度(秒)
高吸水树脂实施例 720 5
高吸水树脂对比例一 120 42
高吸水树脂对比例二 310 30
高吸水树脂对比例三 360 28
作为办法吗的进一步改进，还提供一种改性石墨烯纸的实施例：
步骤一：预氧化
将石墨烯加入到浓度为30％的双氧水中进行预氧化，同时置于水浴锅中，保持温度在80℃预氧化5小时，加入5％浓度的过氧化钠，将双氧水稀释至小于5％的浓度，在水浴中保温1小时，过滤，过滤后的石墨烯加入10％浓度的酮丙二酸浸泡 至30分钟后过滤，之后用去离子水冲洗过滤的到预氧化石墨烯，烘干；
步骤二：
将预氧化石墨烯置于管式炉中，通入氮气保护，直至除去管式炉内的所用空气，同时升温至500℃，之后将氮气换成二氧化碳，保温2小时，之后再将二氧化碳置换成氮气降温至室温，得到氧化石墨烯；
步骤三：
取质量分200份氧化石墨烯，加入1.5份(甲氧基甲基)三甲基硅烷、1份三乙酰氧基乙基硅烷，同时加入N-甲基吡咯烷酮100份，在80℃，1.5MPa下反应1小时，得到改性石墨烯；
步骤四：将100质量份上述干燥后的改性石墨烯粉、5份硅化钼加入到模具中，在5MPa、200℃条件下，模压5～30分钟，得到的石墨烯纸。
在石墨烯纸实施例中，以石墨烯为主体，首先通过双氧水的预氧化，这样就使得石墨烯表面积凹陷增多，且带有活性基团，同时在预氧化后，加入过氧化钠溶液进行稀释，能够较为缓和地逐渐降低氧化活性，保证了在之后清洗过程中，不会有双氧水残留在石墨烯的缝隙中，之后通过酮丙二酸的浸泡清洗，能够有效去除残留的预氧化液，这样就能够保证在后续二氧化碳氧化过程中，不会受到预氧化液影响。
二氧化碳高温氧化过程中，主要靠气体在高温下烧结石墨烯表面，现有技术中，一般直接用二氧化碳氧化，但是，石墨烯本身表面积不大的前提下，经过二氧化碳烧结后的氧化面积增长并不大。如果直接采用化学氧化，则氧化的均匀度难以控制。但是预氧化过程中很容易残留预氧化液，选用本发明的预氧化过程首先能够在二氧化碳烧结前就能够增大石墨烯表面积，之后通过二氧化碳烧结，这样就能够使得氧化石墨烯结构更加均匀。
在完成氧化后，通过加入(甲氧基甲基)三甲基硅烷、三乙酰氧基乙基硅烷、N-甲基吡咯烷酮能够使得活性基团支接在氧化石墨烯表面，通过(甲氧基甲基)三甲基硅烷和三乙酰氧基乙基硅烷活性基团引入，通过引入的活性基团能偶与N-甲基吡咯烷酮发生反应，与之交联在一起。特别是在模压步骤中加入硅化钼，能偶促进改性石墨烯之间发生更加充分的交联，硅化钼作为催化剂使用，能够在短时间内形成石墨烯纸，同时使得石墨烯纸具有较好的力学强度。
改性石墨烯纸测试：
1mm厚的改性石墨烯纸，拉伸强度为：780Mpa；弹性模量为82Gpa。
整体实施例一：
通过本发明制造的LED灯，散热腔底面积为半径为5cm的圆，散热腔高为20cm，散热腔内填充40％溶剂的相变液，相变液选用乙醇。
整体对比例一：
与整体实施例一相比，整体对比例一导热柱就选用空心铜管。
关于空心铜管和导热柱选择直径为0.5cm的空心柱体，均设置六根，以散热腔底面为圆心呈环形等距阵列分布，柱体离圆心距离为2.5cm。
试验：对相变液第一实施例、第二实施例、第三实施例以及第一对比例、第二对比例在LED灯点亮时的温度。
表一：水平放置
  整体实施例一 整体对比例一
0h 20℃ 20℃
1h 22℃ 24℃
3h 27℃ 30℃
10h 36℃ 34℃
24h 45℃ 43℃
36h 45℃ 44℃
168h 46℃ 45℃
表二：倾斜45°放置
  整体实施例一 整体对比例一
0h 20℃ 20℃
1h 22℃ 33℃
3h 27℃ 42℃
10h 36℃ 48℃
24h 45℃ 64℃
36h 45℃ 65℃
168h 46℃ 64℃
原料清单：
丙烯酸      永华化学科技(江苏)有限公司
丙烯酸-2-羟乙酯     山东诺贝特化工科技股份有限公司
四(2-羟乙基)己二酰胺  上海药合生化科技有限公司
4-甲基苯甲酰胺    百灵威科技有限公司
N-[4-(磺酰胺)苯基]丙烯酰胺   石家庄斯迪亚诺精细化工有限公司
过硫酸钾         阿法埃莎(中国)化学有限公司
丙烯酰胺         上海麦克林生化科技有限公司
三烯丙基磷酸酯    上海迈瑞尔化学技术有限公司
2,3-二羟基萘-6-磺酸钠    梯希爱(上海)化成工业发展有限公司
双氧水        上海迈瑞尔化学技术有限公司
酮丙二酸     上海永叶生物科技有限公司
三乙酰氧基乙基硅烷     上海迈瑞尔化学技术有限公司
N-甲基吡咯烷酮        上海阿拉丁生化科技股份有限公司
硅化钼        上海迈瑞尔化学技术有限公司。
以上所述仅是本发明的优选实施方式，本发明的保护范围并不仅局限于上 述实施例，凡属于本发明思路下的技术方案均属于本发明的保护范围。应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理前提下的若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。

Claims (10)

  1. 一种高效散热的相变LED灯用导热柱：其特征在于：包括吸水层(2)，所述吸水层(2)外包覆有碳纤维层(3)，所述碳纤维层(3)外包覆有石墨烯层(4)。
  2. 根据权利要求1所述的一种高效散热的相变LED灯用导热柱，其特征在于：所述石墨烯层(4)上设置有透气孔(5)。
  3. 根据权利要求1或2所述的一种高效散热的相变LED灯用导热柱，其特征在于：所述吸水层(2)为吸水棉芯或高分子吸水树脂。
  4. 根据权利要求3所述的一种高效散热的相变LED灯用导热柱，其特征在于：所述石墨烯层(4)为石墨烯纸。
  5. 根据权利要求2所述的一种高效散热的相变LED灯用导热柱，其特征在于：所述碳纤维层(3)为碳纤维布。
  6. 一种包括如权1至权5所述导热柱的LED灯散热结构，其特征在于：包括散热腔(6)，所述散热腔(6)内填充有相变液，所述散热腔(6)内设置有导热柱(1)，导热柱(1)与相变液接触。
  7. 根据权利要求6所述的相变LED灯散热结构，其特征在于：包括围板(7)以及设置在围板(7)两个开口处的底板(8)，其中一块底板贴合有LED灯(15)，所述围板(7)和两底板(8)形成散热腔(6)，所述导热柱(1)固定在贴合有LED灯(15)的底板(8)上。
  8. 根据权利要求6或7所述的相变LED灯散热结构，其特征在于：所述导热柱(1)上设置有与底板(8)贴合的弯折板(9)，所述底板(8)上设置有夹持板(10)，所述弯折板(9)被夹持在夹持板(10)和底板(8)之间，所述夹持板(10)上设置有第一安装孔(11)，所述底板(8)上设置有螺纹孔(13)，所述所述弯折板(9)上设置有第二安装孔(12)，所述第一安装孔(11)、第二安 装孔(12)、螺纹孔(13)中同时穿设只有固定螺栓(14)。
  9. 根据权利要求8所述的相变LED灯散热结构，其特征在于：所述高分子吸水树脂包括下列重量份组成:
    丙烯酸 200份
    丙烯酸-2-羟乙酯 100份
    四(2-羟乙基)己二酰胺 5份
    4-甲基苯甲酰胺 2份
    N-[4-(磺酰胺)苯基]丙烯酰胺 2份
    过硫酸钾 1份
    丙烯酰胺 30份
    三烯丙基磷酸酯 3份
    2,3-二羟基萘-6-磺酸钠：5份。
    制备步骤如下：
    (1)按配方量将氢氧化钠加入丙烯酸中使其中和；
    (2)将丙烯酰胺与中和后的丙烯酸溶液配制成水溶液，加入丙烯酸-2-羟乙酯和剩余助剂，搅拌均匀，在70℃下聚合反应5小时，得到聚合物；
    (3)将聚合物经造粒、烘干、粉碎后，制得高吸水树脂。
  10. 根据权利要求9所述的相变LED灯散热结构，其特征在于：
    所述改性石墨烯纸有下列步骤制备：
    步骤一：预氧化
    将石墨烯加入到浓度为30％的双氧水中进行预氧化，同时置于水浴锅中，保持温度在80℃预氧化5小时，加入5％浓度的过氧化钠，将双氧水稀释至小于5％的浓度，在水浴中保温1小时，过滤，过滤后的石墨烯加入10％浓度的酮丙二酸浸泡 至30分钟后过滤，之后用去离子水冲洗过滤的到预氧化石墨烯，烘干；
    步骤二：
    将预氧化石墨烯置于管式炉中，通入氮气保护，直至除去管式炉内的所用空气，同时升温至500℃，之后将氮气换成二氧化碳，保温2小时，之后再将二氧化碳置换成氮气降温至室温，得到氧化石墨烯；
    步骤三：
    取质量分200份氧化石墨烯，加入1.5份(甲氧基甲基)三甲基硅烷、1份三乙酰氧基乙基硅烷，同时加入N-甲基吡咯烷酮100份，在80℃，1.5MPa下反应1小时，得到改性石墨烯；
    步骤四：将100质量份上述干燥后的改性石墨烯粉、5份硅化钼加入到模具中，在5MPa、200℃条件下，模压5～30分钟，得到的石墨烯纸。
PCT/CN2016/107844 2016-11-24 2016-11-30 一种高效散热的相变led灯导热柱及其散热结构 WO2018094750A1 (zh)

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