阅读说明：本技术 一种石墨烯散热护眼台灯的制备方法 (Preparation method of graphene heat dissipation eye protection desk lamp ) 是由 姚林 唐军 王凯 王柯钧 于 2021-09-03 设计创作，主要内容包括：本发明公开了一种石墨烯散热护眼台灯的制备方法,具体来说就是先分别制备底座、支架、灯罩壳体和灯罩盖板,再将底座、支架、灯罩壳体、灯罩盖板和LED灯珠组装即形成台灯。其中,所述的底座、支架和灯罩壳体均由石墨烯复合导热粒料经注塑形成。所述灯罩盖板包括从内至外依次设置的石墨烯复合光反射片、石墨烯复合导光片和石墨烯复合光扩散片,所述石墨烯复合光反射片、石墨烯复合导光片和石墨烯复合光扩散片通过将石墨烯透明分散液分别以旋涂、浸涂、辊涂或喷涂的方式涂覆在不同基板上经干燥形成。利用本发明制备的台灯不仅能够有效提高台灯的散热效果以及降低台灯的质量,还具有吸收蓝光、提升照度及均匀性、防晕眩等更佳的护眼效果。(The invention discloses a preparation method of a graphene heat-dissipation eye-protection desk lamp, which comprises the steps of preparing a base, a support, a lampshade shell and a lampshade cover plate respectively, and assembling the base, the support, the lampshade shell, the lampshade cover plate and LED lamp beads to form the desk lamp. The base, the support and the lamp shade shell are all formed by injection molding of graphene composite heat conduction granules. The lampshade cover plate comprises a graphene composite light reflection sheet, a graphene composite light guide sheet and a graphene composite light diffusion sheet which are sequentially arranged from inside to outside, wherein the graphene composite light reflection sheet, the graphene composite light guide sheet and the graphene composite light diffusion sheet are formed by coating graphene transparent dispersion liquid on different substrates in a spin coating, dip coating, roll coating or spraying mode respectively and drying the graphene transparent dispersion liquid. The desk lamp prepared by the invention not only can effectively improve the heat dissipation effect of the desk lamp and reduce the quality of the desk lamp, but also has better eye protection effects of absorbing blue light, improving illumination intensity and uniformity, preventing dizziness and the like.)

1. A preparation method of a graphene heat dissipation eye-protection desk lamp is characterized by comprising the following steps: firstly, respectively preparing a base, a support, a lampshade shell and a lampshade cover plate, and then assembling the base, the support, the lampshade shell, the lampshade cover plate and the LED lamp beads to form the desk lamp; wherein the content of the first and second substances,

the base, the support and the lamp shade shell are all formed by injection molding of graphene composite heat conduction granules, and the preparation method of the graphene composite heat conduction granules comprises the following steps:

step 1: adding 1-20 parts of graphene, 1-30 parts of graphite nanosheets and 1-10 parts of heat-conducting fiber fillers into a first dispersion liquid, wherein the first dispersion liquid is formed by uniformly mixing 1-5 parts of first dispersing agents and 40-96 parts of deionized water; then stirring at high speed for pre-dispersing for 10-30min, then dispersing for 10-100min in a homogenizing or sanding mode, and obtaining a composite dispersion liquid after dispersion;

step 2: adding thermoplastic resin into a double-screw extruder, adding composite dispersion liquid into a resin melt in a spraying mode after the thermoplastic resin is completely plasticized, wherein the mass fraction of the composite dispersion liquid is 10-60% of that of the thermoplastic resin, then shearing and mixing the materials through the double-screw extruder to uniformly disperse the composite dispersion liquid in the resin, and obtaining the graphene composite heat-conducting granules after dispersion;

the lampshade cover plate comprises a graphene composite light reflection sheet, a graphene composite light guide sheet and a graphene composite light diffusion sheet which are sequentially arranged from inside to outside, wherein the graphene composite light reflection sheet, the graphene composite light guide sheet and the graphene composite light diffusion sheet are formed by coating graphene transparent dispersion liquid on different substrates in a spin coating, dip coating, roll coating or spraying mode respectively and drying the graphene transparent dispersion liquid.

2. The preparation method of the graphene heat-dissipation eye-protection desk lamp according to claim 1, wherein the preparation method comprises the following steps: the preparation method of the graphene transparent dispersion liquid comprises the following steps: firstly, adding 0.1-2% of single-layer graphene/graphene oxide by mass into a second dispersion liquid, wherein the second dispersion liquid is formed by mixing 1-5% of a second dispersing agent by mass and isopropanol; and then dispersing uniformly in an ultrasonic or homogeneous mode to obtain the transparent graphene dispersion liquid.

3. The preparation method of the graphene heat-dissipation eye-protection desk lamp according to claim 2, wherein the preparation method comprises the following steps: the graphene composite light reflection sheet is formed by coating a graphene transparent dispersion liquid on a PVA substrate, and the thickness of the coating after drying is 0.1-1 um; the graphene composite light guide sheet is formed by coating a transparent graphene dispersion liquid on a PC substrate, and the thickness of the coating after drying is 0.1-1 um; the graphene composite light diffusion sheet is formed by coating a transparent graphene dispersion liquid on a PS substrate, and the thickness of the coating after drying is 0.1-1 um.

4. The preparation method of the graphene heat-dissipation eye-protection desk lamp according to claim 2, wherein the preparation method comprises the following steps: the second dispersant is one or more of sodium polystyrene sulfonate, poly 3, 4-ethylenedioxythiophene, water-based transparent polyester, water-based acrylic resin, water-based phenolic resin and derivatives thereof which are mixed according to any proportion.

5. The preparation method of the graphene heat-dissipation eye-protection desk lamp according to claim 2, wherein the preparation method comprises the following steps: the sheet diameter of the single-layer graphene/graphene oxide is 1-5 um.

6. The preparation method of the graphene heat-dissipation eye-protection desk lamp according to claim 1, wherein the preparation method comprises the following steps: in the step 1, the graphene refers to intrinsic graphene with the number of layers of 1-10 and the transverse dimension of 1-5 um.

7. The preparation method of the graphene heat-dissipation eye-protection desk lamp according to claim 1, wherein the preparation method comprises the following steps: in the step 1, the graphite nanosheet is a graphite nanosheet with 10-100 layers and 5-10um of transverse dimension.

8. The preparation method of the graphene heat-dissipation eye-protection desk lamp according to claim 1, wherein the preparation method comprises the following steps: in step 1, the heat-conducting fiber filler is multi-walled carbon nano-tubes or carbon fibers with the diameter of 1-50nm and the length of 1-30 um.

9. The preparation method of the graphene heat-dissipation eye-protection desk lamp according to claim 1, wherein the preparation method comprises the following steps: in the step 1, the first dispersing agent is one or more of sodium polystyrene sulfonate, cellulose and derivatives thereof, polyvinylpyrrolidone, styrene maleic anhydride copolymer, polyacrylamide, chitosan and derivatives thereof which are mixed according to any proportion.

Technical Field

The invention relates to the technical field of lighting, in particular to a preparation method of a graphene heat-dissipation eye-protection desk lamp.

Background

Compared with the traditional lamp, the LED lamp has the advantages of small size, low power consumption, high brightness, and the like, and thus is increasingly widely applied to various lighting fields, particularly to the field of table lamps. With the development of LED table lamps, the requirements for the volume miniaturization, simplification, health use and the like of the table lamp are higher and higher, and especially the requirements for the illumination, stroboflash, blue light, dizzy prevention and the like of the table lamp are higher and higher. Generally speaking, in order to meet the optical requirements of the table lamp, the number of LED lamp beads and corresponding electronic components need to be increased, but this also increases the power of the table lamp, so the heat dissipation of the LED table lamp is a technical problem that needs to be considered seriously.

At present, the mainstream heat dissipation design scheme of the LED table lamp is two types: firstly, aluminum alloy 6063 is adopted for heat dissipation; and secondly, low-heat-conductivity plastics such as ABS/PC/PS or non-heat-conductivity plastics are used as a heat dissipation shell for heat dissipation. However, the first scheme has the problems of heavy weight, poor hand touch feeling, high cost and the like of the desk lamp, and the second scheme has the problem of poor heat dissipation performance, so that the requirements of high illumination, small size, healthy action and the like at present cannot be met.

Since the appearance of graphene, graphene itself is found to have excellent heat conductivity, the heat conductivity of the graphene is as high as 5000W/(m.K), which is 10 times that of copper, and the graphene also has the height of 2600m²The specific surface area is ultrahigh and is 100 times of that of steel, and the steel has good flexibility and extensibility. Therefore, the graphene has the advantages of high heat conductivity, high strength and light weight, and is an ideal light and efficient heat management material. Therefore, people also widely apply graphene to the field of heat dissipation.

Publication No. CN 105546397A's document discloses an eye protection desk lamp, it includes base, lamp pole, through the lamp pole is installed lamp shade on the base and be located LED light source in the lamp shade, the lamp shade divide into lamp shade protecgulum and lamp shade back cover, the lamp shade protecgulum adopts transparent material to make, and its inner surface is provided with adiabatic anti-blue light absorption layer, cover behind the lamp shade and be provided with the heat conduction post, its inner wall is provided with heat absorbing layer and heat conduction anti-blue light absorption layer. According to the patent, the heat conduction and insulation coating absorbing blue light is prepared by using graphene, epoxy resin, zinc sulfide, zinc oxide and the like as raw materials, and the blue-light-proof eye protection lamp is prepared. But it has poor heat-conductive property because it uses pure resin as a heat-conductive material. And because the light is not designed by structures such as conduction and diffusion, the flash frequency and dizzy can not be effectively prevented when the LED lamp is used. Has great defects in terms of heat dissipation and eye protection

The publication No. CN106224820A discloses a high-luminous-efficiency eye-protecting lamp, wherein a lamp tube of the eye-protecting lamp is a fluorescent lamp glass tube, and the inner wall of the fluorescent lamp glass tube is coated with a transparent nano titanium dioxide film. The circuit of the eye-protection lamp adopts 5 rectifier diodes. The circuit design of the eye-protecting lamp enables the illumination to be uniform, and the fluorescent lamp tube coated with the titanium dioxide nano film has the advantages of long service life, high stability and high color rendering property. This patent makes illumination even through utilize coating titanium dioxide film in the fluorescent tube wall, does not have the appearance of low frequency stroboscopic scheduling problem, but this patent only plays prevents the stroboscopic effect, and its effect in the aspect of heat dissipation, blue light, dizzy and so on is still relatively poor. And the TiO2 film is generally produced by adopting a coating or magnetron sputtering method, so that the production cost is generally higher.

The publication No. CN106752701A discloses an electrostatic spraying coating containing modified carbon nanotubes, which is applied to an LED lamp and comprises the following raw materials: epoxy resin, polyurethane, sebacic dihydrazide, methyl tetrahydrophthalic anhydride, undecyl imidazole, 2, 4, 6-tri (dimethylaminomethyl) phenol, 2-butyl-2-ethyl-1, 3-propanediol, silicon carbide, modified carbon nano-tubes, graphene, aluminum nitride, lanthanum oxide, yttrium oxide, nano calcium carbonate, mica powder, calcium silicate, phenyltrimethoxysilane, phenylmethyldimethoxysilane and dibutyltin dilaurate. The patent takes epoxy resin and polyurethane as main resin, and prepares the electrostatic spraying heat dissipation coating by utilizing modified carbon nano tubes, ceramic heat conduction fillers and the like for improving heat dissipation performance, but the heat dissipation coating can only assist in heat conduction, and is enough for heat dissipation performance of aluminum alloy without heat dissipation coating. For common heat-conducting plastics, the heat conductivity coefficient is extremely low, and the effect of introducing the heat-radiating coating is also very low, so that the heat-radiating coating has no practical application significance.

The publication No. CN109627645A discloses a heat radiation lamp holder material for an LED energy-saving lamp, which comprises 130 parts by weight of fluorocarbon resin 120, 80-90 parts by weight of modified epoxy resin, 5-9 parts by weight of nano silicon carbide, 6-8 parts by weight of nano silicon carbide powder, 4-10 parts by weight of nano aluminum oxide, 3-5 parts by weight of potassium hexatitanate whisker, 15-19 parts by weight of microcrystalline kaolinite, 7-11 parts by weight of graphene oxide, 1-3 parts by weight of nano tungsten carbide and the like. According to the patent, the lamp holder of the LED lamp is prepared by using epoxy resin and fluorocarbon resin as matrixes and using graphene oxide, nano silicon carbide, nano aluminum oxide, nano tungsten carbide and the like as heat-conducting fillers. But firstly, the structure of the graphene oxide is greatly damaged during preparation, so that the thermal conductivity of the graphene oxide is poor; secondly, for the desk lamp, the calorific capacity of lamp stand is basically negligible, therefore it does not have practical meaning.

Publication No. CN109975900A discloses a reflective film with a heat-conducting coating, and a preparation method and application thereof. In order to solve the problem of poor heat dissipation of the existing reflecting film, the invention provides a reflecting film with a heat-conducting coating, and a preparation method and application thereof. The reflective film with the heat-conducting coating comprises the heat-conducting coating and a substrate layer, and the heat-conducting coating is attached to the surface of the substrate layer. The patent prepares a coating liquid by using graphene, an organic solvent, acrylic resin, isocyanate and the like, and prepares a heat-conducting coating layer with a heat conductivity coefficient of at most 1W/mK by coating on the surface of a reflecting film. But in practice, the thermal conductivity is low, and the heat dissipation function is very limited.

In summary, there are some technical problems in the conventional LED table lamp in terms of weight, heat dissipation and eye protection, and therefore, it is urgently needed to develop a new technology to solve the technical problems.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provides a preparation method of a graphene heat-dissipation eye-protection desk lamp.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a preparation method of a graphene heat dissipation eye-protection desk lamp is characterized by comprising the following steps: firstly, respectively preparing a base, a support, a lampshade shell and a lampshade cover plate, and then assembling the base, the support, the lampshade shell, the lampshade cover plate and the LED lamp beads to form the desk lamp; wherein the content of the first and second substances,

the base, the support and the lamp shade shell are all formed by injection molding of graphene composite heat conduction granules, and the preparation method of the graphene composite heat conduction granules comprises the following steps:

step 1: adding 1-20 parts of graphene, 1-30 parts of graphite nanosheets and 1-10 parts of heat-conducting fiber fillers into a first dispersion liquid, wherein the first dispersion liquid is formed by uniformly mixing 1-5 parts of first dispersing agents and 40-96 parts of deionized water; then stirring at high speed for pre-dispersing for 10-30min, then dispersing for 10-100min in a homogenizing or sanding mode, and obtaining a composite dispersion liquid after dispersion;

step 2: adding thermoplastic resin into a double-screw extruder, adding composite dispersion liquid into a resin melt in a spraying mode after the thermoplastic resin is completely plasticized, wherein the mass fraction of the composite dispersion liquid is 10-60% of that of the thermoplastic resin, then shearing and mixing the materials through the double-screw extruder to uniformly disperse the composite dispersion liquid in the resin, and obtaining the graphene composite heat-conducting granules after dispersion;

the lampshade cover plate comprises a graphene composite light reflection sheet, a graphene composite light guide sheet and a graphene composite light diffusion sheet which are sequentially arranged from inside to outside, wherein the graphene composite light reflection sheet, the graphene composite light guide sheet and the graphene composite light diffusion sheet are formed by coating graphene transparent dispersion liquid on different substrates in a spin coating, dip coating, roll coating or spraying mode respectively and drying the graphene transparent dispersion liquid.

The preparation method of the graphene transparent dispersion liquid comprises the following steps: firstly, adding 0.1-2% of single-layer graphene/graphene oxide by mass into a second dispersion liquid, wherein the second dispersion liquid is formed by mixing 1-5% of a second dispersing agent by mass and isopropanol; and then dispersing uniformly in an ultrasonic or homogeneous mode to obtain the transparent graphene dispersion liquid.

The graphene composite light reflection sheet is formed by coating a graphene transparent dispersion liquid on a PVA substrate, and the thickness of the coating after drying is 0.1-1 um; the graphene composite light guide sheet is formed by coating a transparent graphene dispersion liquid on a PC substrate, and the thickness of the coating after drying is 0.1-1 um; the graphene composite light diffusion sheet is formed by coating a transparent graphene dispersion liquid on a PS substrate, and the thickness of the coating after drying is 0.1-1 um.

The second dispersant is one or more of sodium polystyrene sulfonate, poly 3, 4-ethylenedioxythiophene, water-based transparent polyester, water-based acrylic resin, water-based phenolic resin and derivatives thereof which are mixed according to any proportion.

The sheet diameter of the single-layer graphene/graphene oxide is 1-5 um.

In the step 1, the graphene refers to intrinsic graphene with the number of layers of 1-10 and the transverse dimension of 1-5 um.

In the step 1, the graphite nanosheet is a graphite nanosheet with 10-100 layers and 5-10um of transverse dimension.

In step 1, the heat-conducting fiber filler is multi-walled carbon nano-tubes or carbon fibers with the diameter of 1-50nm and the length of 1-30 um.

In the step 1, the first dispersing agent is one or more of sodium polystyrene sulfonate, cellulose and derivatives thereof, polyvinylpyrrolidone, styrene maleic anhydride copolymer, polyacrylamide, chitosan and derivatives thereof which are mixed according to any proportion.

The invention has the advantages that:

1. the main improvement points of the invention are that the base, the bracket and the lampshade shell are all formed by injection molding of graphene composite heat-conducting granules, and the lampshade cover plate is compounded by graphene transparent dispersion liquid. Specifically, the graphene, the graphite nanosheets and the heat-conducting fiber filler are used as raw materials to prepare the composite dispersion liquid, and the composite dispersion liquid is directly added into the melt to be compounded with the resin matrix, so that the dispersity of the graphene is guaranteed to the maximum extent, the dispersing uniformity of the heat-conducting fiber filler is guaranteed, and the high heat-conducting coefficient of the product is guaranteed. Because base, support and lamp shade casing are formed by graphite alkene compound heat conduction aggregate through moulding plastics, consequently not only replaced aluminium alloy, not heat conduction plastics etc. that use in the present desk lamp, still solved the drawback that the radiating effect that exists is not good, the quality is heavier etc. among the present lighting system. In addition, the transparent graphene dispersion liquid prepared from the single-layer graphene/graphene oxide can be coated on the light reflection sheet, the light guide column and the light diffusion film to obtain a coating with the light transmittance of more than 80%, so that the lampshade cover plate has high light transmittance and also has the eye protection effects of absorbing blue light, having high illumination, preventing dizzy and the like, and the eye health can be effectively protected.

2. In the invention, the base, the bracket and the lampshade shell are made of the same material and have high heat-conducting property, so that part of heat can be guided into the base through the bracket during heat dissipation and can be dissipated again through the base. The graphene composite light reflection sheet, the graphene composite light guide sheet and the graphene composite light diffusion sheet which are compounded through the graphene also have excellent heat dissipation performance, and partial heat dissipation can be provided. This enables the formation of a three-layer heat dissipation system, thereby giving excellent heat dissipation performance to the product as a whole.

3. According to the invention, when the graphene composite heat-conducting granules are prepared, the composite dispersion liquid is directly added into the resin melt, so that the secondary agglomeration of graphene can be effectively avoided.

4. According to the invention, the graphene composite heat-conducting granules are compounded by adopting the nano graphite sheets, the graphene and the high heat-conducting fibers, wherein the nano graphite sheets are easy to disperse and can generate an induced orientation on the graphene, so that the radiator has excellent heat conductivity in the X direction; and the high-thermal-conductivity fiber filler can overcome thermal resistance between graphene and graphene, so that high longitudinal thermal conductivity is achieved. And secondly, the graphene/nano graphite sheet/fiber mixed dispersion can effectively prevent the graphene from generating secondary stacking, and can also improve the longitudinal heat conductivity coefficient.

5. The sizes of the graphene, the graphite nanosheets, the heat-conducting fibrous filler and the like are further limited when the composite dispersion liquid is prepared, the larger the sheet diameter of the graphene is, the more easily the graphene is curled, the smaller the sheet diameter of the graphene is, the more easily the graphene is dispersed, but the higher the heat resistance is, so the sheet diameter of the graphene needs to be selected and the heat-conducting and dispersing performances need to be considered.

The sheet diameter of the graphite nanosheet is selected to be large because the graphite nanosheet is subjected to induced orientation on graphene, the graphene is smaller than the sheet diameter of the graphene and can be wrapped by the graphene, the mechanical strength of the product can be influenced if the graphene is too large, and the fiber filler is the same principle, so that the longer the graphene is, the thinner the graphene is, the easier the graphene is to knot, and the use effect is reduced.

6. The first dispersing agent is used in the preparation of the composite dispersion liquid, the type selection of the dispersing agent is to adopt a polar dispersing agent which can be dissolved in water, the section of the dispersing agent can generate non-covalent interaction with graphene, and the polar end can form a repulsion effect, so that a better dispersing effect is achieved, and the non-agglomeration is ensured.

5. The invention adopts 1-5um single-layer graphene/graphene oxide and a specific second dispersing agent when preparing the transparent graphene dispersion liquid. For the graphene dispersion liquid, two conditions need to be met simultaneously to achieve excellent light transmittance; one is a low number of layers and the other is good dispersive orientation. The highest transmittance can be obtained by adopting specific single-layer graphene/graphene oxide, and the second dispersing agents such as sodium polystyrene sulfonate, poly 3, 4-ethylenedioxythiophene, water-based transparent polyester, water-based acrylic resin, water-based phenolic resin and derivatives thereof have large conjugated bonds and can generate a strong conjugated effect with graphene.

8. According to the invention, heat emitted from the LED lamp is radiated through the graphene heat conducting plastic, so that infrared rays with a wave band of 8-15um can be generated in the radiation radiating process, and the function of protecting human bodies can be achieved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged schematic view of FIG. 1 at I;

labeled as: 1. the LED lamp comprises a base, 2, a support, 3, a lampshade shell, 4, a lampshade cover plate, 5, LED lamp beads, 6, a graphene composite light reflection sheet, 7, a graphene composite light guide sheet, and 8, a graphene composite light diffusion sheet.

Detailed Description

The invention discloses a preparation method of a graphene heat-dissipation eye-protection desk lamp. As shown in fig. 1 and 2, the shapes of the base, the bracket and the lamp cover shell are not limited, and can be set as required, and for facilitating wiring, wiring channels and the like can be arranged in the bracket and the base. The LED lamp comprises a base, a support, a lampshade shell and a lampshade cover plate, wherein the support is fixed on the base, the lampshade shell is fixed on the support, LED lamp beads are fixed in the lampshade shell, and the lampshade cover plate is fixed on the lampshade shell to form the complete desk lamp.

Further, the base, the bracket and the lamp shade shell are all formed by injection molding of graphene composite heat conduction granules, and the preparation method of the graphene composite heat conduction granules comprises the following steps:

step 1: adding 1-20 parts of graphene, 1-30 parts of graphite nanosheets and 1-10 parts of heat-conducting fiber fillers into a first dispersion liquid, wherein the first dispersion liquid is formed by uniformly mixing 1-5 parts of first dispersing agents and 40-96 parts of deionized water; and then stirring at high speed for pre-dispersion for 10-30min, then dispersing for 10-100min in a homogenizing or sanding mode, and obtaining the composite dispersion after dispersion.

In this step, the graphene refers to intrinsic graphene having 1-10 layers and a transverse dimension of 1-5 um. The graphite nanosheet is a graphite nanosheet heat-conducting fibrous filler with 10-100 layers and a transverse size of 5-10um, and is a multiwall carbon nanotube or carbon fiber with a diameter of 1-50nm and a length of 1-30 um. The first dispersant is one or more of sodium polystyrene sulfonate, cellulose and derivatives thereof, polyvinylpyrrolidone, styrene maleic anhydride copolymer, polyacrylamide, chitosan and derivatives thereof which are mixed according to any proportion.

Step 2: adding thermoplastic resin into a double-screw extruder, adding composite dispersion liquid into a resin melt in a spraying mode after the thermoplastic resin is completely plasticized, wherein the mass fraction of the composite dispersion liquid is 10-60% of that of the thermoplastic resin, then shearing and mixing the materials through the double-screw extruder to uniformly disperse the composite dispersion liquid in the resin, and obtaining the graphene composite heat-conducting granules after dispersion.

Furthermore, the lampshade cover plate comprises a graphene composite light reflection sheet, a graphene composite light guide sheet and a graphene composite light diffusion sheet which are sequentially arranged from inside to outside, and the graphene composite light reflection sheet, the graphene composite light guide sheet and the graphene composite light diffusion sheet are formed by respectively coating graphene transparent dispersion liquid on different substrates in a spin coating, dip coating, roll coating or spray coating mode and drying.

The preparation method of the transparent graphene dispersion liquid comprises the following steps: firstly, 0.1-2% of single-layer graphene/graphene oxide by mass is added into a second dispersion liquid, the sheet diameter of the single-layer graphene/graphene oxide is 1-5 microns, the second dispersion liquid is formed by mixing 1-5% of second dispersion liquid and isopropanol by mass, and the second dispersion liquid is one or more of sodium polystyrene sulfonate, poly 3, 4-ethylenedioxythiophene, water-based transparent polyester, water-based acrylic resin, water-based phenolic resin and derivatives thereof by mass. And then dispersing uniformly in an ultrasonic or homogeneous mode to obtain the transparent graphene dispersion liquid. After the graphene transparent dispersion liquid is obtained, the graphene transparent dispersion liquid is coated on a PVA substrate and dried to obtain a graphene composite light reflection sheet, the graphene transparent dispersion liquid is coated on a PC substrate and dried to obtain a graphene composite light guide sheet, and the graphene transparent dispersion liquid is coated on a PS substrate and dried to obtain a graphene composite light diffusion sheet.

Furthermore, the thickness of the dried graphene composite light reflecting sheet is 0.1-1um, the thickness of the dried graphene composite light guiding sheet is 0.1-1um, and the thickness of the dried graphene composite light diffusing sheet is 0.1-1 um.

The present invention will be described in detail with reference to specific examples.

Example 1

A preparation method of a graphene heat-dissipation eye-protection desk lamp comprises the steps of respectively preparing a base, a support, a lampshade shell and a lampshade cover plate, and then assembling the base, the support, the lampshade shell, the lampshade cover plate and LED lamp beads to form the desk lamp.

Further, the base, the bracket and the lamp shade shell are all formed by injection molding of graphene composite heat conduction granules, and the preparation method of the graphene composite heat conduction granules comprises the following steps:

step 1: adding 1 part of graphene, 1 part of graphite nanosheet and 1 part of heat-conducting fiber filler into a first dispersion liquid, wherein the first dispersion liquid is formed by uniformly mixing 1 part of first dispersing agent and 40 parts of deionized water; and then stirring at a high speed for pre-dispersing for 10min, then dispersing for 10min in a homogenizing or sanding manner, and obtaining the composite dispersion after dispersion.

In this step, the graphene refers to intrinsic graphene having 1 to 8 layers and a transverse dimension of 1 to 3 um. The graphite nanosheet is a graphite nanosheet heat-conducting fibrous filler with 10-80 layers and a transverse size of 5-8um, and is a multiwall carbon nanotube or carbon fiber with a diameter of 1-40nm and a length of 1-20 um. The first dispersant is sodium polystyrene sulfonate.

Step 2: adding thermoplastic resin into a double-screw extruder, adding the composite dispersion liquid into a resin melt in a spraying mode after the thermoplastic resin is completely plasticized, wherein the mass fraction of the composite dispersion liquid is 10% compared with that of the thermoplastic resin, then shearing and mixing the materials through the double-screw extruder to uniformly disperse the composite dispersion liquid in the resin, and obtaining the graphene composite heat-conducting granules after dispersion.

Furthermore, the lampshade cover plate comprises a graphene composite light reflection sheet, a graphene composite light guide sheet and a graphene composite light diffusion sheet which are sequentially arranged from inside to outside, and the graphene composite light reflection sheet, the graphene composite light guide sheet and the graphene composite light diffusion sheet are formed by respectively coating graphene transparent dispersion liquid on different substrates in a spin coating, dip coating, roll coating or spray coating mode and drying.

The preparation method of the transparent graphene dispersion liquid comprises the following steps: firstly, adding 0.1% of single-layer graphene/graphene oxide by mass into a second dispersion liquid, wherein the sheet diameter of the single-layer graphene/graphene oxide is 1-4um, the second dispersion liquid is formed by mixing 1% of a second dispersion agent by mass and isopropanol, and the second dispersion agent is poly (3, 4-ethylenedioxythiophene). And then dispersing uniformly in an ultrasonic or homogeneous mode to obtain the transparent graphene dispersion liquid. After the graphene transparent dispersion liquid is obtained, the graphene transparent dispersion liquid is coated on a PVA substrate and dried to obtain a graphene composite light reflection sheet, the graphene transparent dispersion liquid is coated on a PC substrate and dried to obtain a graphene composite light guide sheet, and the graphene transparent dispersion liquid is coated on a PS substrate and dried to obtain a graphene composite light diffusion sheet.

Further, the thickness of the coating after the graphene composite light reflection sheet is dried is 0.1um, the thickness of the coating after the graphene composite light guide sheet is dried is 0.1um, and the thickness of the coating after the graphene composite light diffusion sheet is dried is 0.1 um.

Example 2

A preparation method of a graphene heat-dissipation eye-protection desk lamp comprises the steps of respectively preparing a base, a support, a lampshade shell and a lampshade cover plate, and then assembling the base, the support, the lampshade shell, the lampshade cover plate and LED lamp beads to form the desk lamp.

Further, the base, the bracket and the lamp shade shell are all formed by injection molding of graphene composite heat conduction granules, and the preparation method of the graphene composite heat conduction granules comprises the following steps:

step 1: adding 10 parts of graphene, 15 parts of graphite nanosheets and 5 parts of heat-conducting fiber filler into a first dispersion liquid, wherein the first dispersion liquid is formed by uniformly mixing 2 parts of first dispersing agent and 72 parts of deionized water; and then stirring at a high speed for pre-dispersing for 20min, then dispersing for 50min in a homogenizing or sanding manner, and obtaining the composite dispersion after dispersion.

In this step, the graphene refers to intrinsic graphene having 1 to 5 layers and a lateral dimension of 2 to 4 um. The graphite nanosheet is the graphite nanosheet heat-conducting fibrous filler with the number of layers of 30-60 and the transverse size of 6-8um, and is a multi-walled carbon nanotube or carbon fiber with the diameter of 10-40nm and the length of 5-15 um. The first dispersant is cellulose and its derivatives.

Step 2: adding thermoplastic resin into a double-screw extruder, adding the composite dispersion liquid into a resin melt in a spraying mode after the thermoplastic resin is completely plasticized, wherein the mass fraction of the composite dispersion liquid is 30% compared with that of the thermoplastic resin, then shearing and mixing the materials through the double-screw extruder to uniformly disperse the composite dispersion liquid in the resin, and obtaining the graphene composite heat-conducting granules after dispersion.

Furthermore, the lampshade cover plate comprises a graphene composite light reflection sheet, a graphene composite light guide sheet and a graphene composite light diffusion sheet which are sequentially arranged from inside to outside, and the graphene composite light reflection sheet, the graphene composite light guide sheet and the graphene composite light diffusion sheet are formed by respectively coating graphene transparent dispersion liquid on different substrates in a spin coating, dip coating, roll coating or spray coating mode and drying.

The preparation method of the transparent graphene dispersion liquid comprises the following steps: firstly, adding 1% of single-layer graphene/graphene oxide by mass into a second dispersion liquid, wherein the sheet diameter of the single-layer graphene/graphene oxide is 3-5um, the second dispersion liquid is formed by mixing 3% of second dispersion agent by mass and isopropanol, and the second dispersion agent is sodium polystyrene sulfonate. And then dispersing uniformly in an ultrasonic or homogeneous mode to obtain the transparent graphene dispersion liquid. After the graphene transparent dispersion liquid is obtained, the graphene transparent dispersion liquid is coated on a PVA substrate and dried to obtain a graphene composite light reflection sheet, the graphene transparent dispersion liquid is coated on a PC substrate and dried to obtain a graphene composite light guide sheet, and the graphene transparent dispersion liquid is coated on a PS substrate and dried to obtain a graphene composite light diffusion sheet.

Further, the thickness of the coating after the graphene composite light reflecting sheet is dried is 0.2um, the thickness of the coating after the graphene composite light guiding sheet is dried is 0.5um, and the thickness of the coating after the graphene composite light diffusing sheet is dried is 0.5 um.

Example 3

A preparation method of a graphene heat-dissipation eye-protection desk lamp comprises the steps of respectively preparing a base, a support, a lampshade shell and a lampshade cover plate, and then assembling the base, the support, the lampshade shell, the lampshade cover plate and LED lamp beads to form the desk lamp.

Further, the base, the bracket and the lamp shade shell are all formed by injection molding of graphene composite heat conduction granules, and the preparation method of the graphene composite heat conduction granules comprises the following steps:

step 1: adding 20 parts of graphene, 30 parts of graphite nanosheets and 10 parts of heat-conducting fiber filler into a first dispersion liquid, wherein the first dispersion liquid is formed by uniformly mixing 5 parts of first dispersing agent and 96 parts of deionized water; and then stirring at a high speed for pre-dispersing for 30min, then dispersing for 100min in a homogenizing or sanding manner, and obtaining the composite dispersion after dispersion.

In this step, the graphene refers to intrinsic graphene having 1 to 3 layers and a transverse dimension of 1 to 3 um. The graphite nanosheet is a graphite nanosheet heat-conducting fiber filler with 10-20 layers and a transverse size of 5-7um, and is a multiwall carbon nanotube or carbon fiber with a diameter of 1-10nm and a length of 1-10 um. The first dispersant is a polyacrylamide.

Step 2: adding thermoplastic resin into a double-screw extruder, adding the composite dispersion liquid into a resin melt in a spraying mode after the thermoplastic resin is completely plasticized, wherein the mass fraction of the composite dispersion liquid is 60% compared with that of the thermoplastic resin, then shearing and mixing the materials through the double-screw extruder to uniformly disperse the composite dispersion liquid in the resin, and obtaining the graphene composite heat-conducting granules after dispersion.

Furthermore, the lampshade cover plate comprises a graphene composite light reflection sheet, a graphene composite light guide sheet and a graphene composite light diffusion sheet which are sequentially arranged from inside to outside, and the graphene composite light reflection sheet, the graphene composite light guide sheet and the graphene composite light diffusion sheet are formed by respectively coating graphene transparent dispersion liquid on different substrates in a spin coating, dip coating, roll coating or spray coating mode and drying.

The preparation method of the transparent graphene dispersion liquid comprises the following steps: firstly, adding 2% of single-layer graphene/graphene oxide in mass ratio into a second dispersion liquid, wherein the sheet diameter of the single-layer graphene/graphene oxide is 1-3um, the second dispersion liquid is formed by mixing 5% of second dispersion agent in mass ratio with isopropanol, and the second dispersion agent is water-based transparent polyester. And then dispersing uniformly in an ultrasonic or homogeneous mode to obtain the transparent graphene dispersion liquid. After the graphene transparent dispersion liquid is obtained, the graphene transparent dispersion liquid is coated on a PVA substrate and dried to obtain a graphene composite light reflection sheet, the graphene transparent dispersion liquid is coated on a PC substrate and dried to obtain a graphene composite light guide sheet, and the graphene transparent dispersion liquid is coated on a PS substrate and dried to obtain a graphene composite light diffusion sheet.

Further, the thickness of the coating after the graphene composite light reflection sheet is dried is 1um, and the thickness of the coating after the graphene composite light diffusion sheet is dried is 1 um.

Example 4

A preparation method of a graphene heat-dissipation eye-protection desk lamp comprises the steps of respectively preparing a base, a support, a lampshade shell and a lampshade cover plate, and then assembling the base, the support, the lampshade shell, the lampshade cover plate and LED lamp beads to form the desk lamp.

Further, the base, the bracket and the lamp shade shell are all formed by injection molding of graphene composite heat conduction granules, and the preparation method of the graphene composite heat conduction granules comprises the following steps:

step 1: adding 1 part of graphene, 30 parts of graphite nanosheets and 10 parts of heat-conducting fiber filler into a first dispersion liquid, wherein the first dispersion liquid is formed by uniformly mixing 4 parts of first dispersing agent and 50 parts of deionized water; and then stirring at a high speed for pre-dispersing for 15min, then dispersing for 80min in a homogenizing or sanding manner, and obtaining the composite dispersion after dispersion.

In this step, the graphene refers to intrinsic graphene having 5 to 10 layers and 3 to 5um in lateral dimension. The graphite nanosheet is a graphite nanosheet heat-conducting fibrous filler with 70-100 layers and a transverse size of 8-10um, and is a multiwall carbon nanotube or carbon fiber with a diameter of 30-50nm and a length of 1-10 um. The first dispersant is several kinds of sodium polystyrene sulfonate, cellulose and its derivative and polyvinyl pyrrolidone mixed in any proportion.

Step 2: adding thermoplastic resin into a double-screw extruder, adding the composite dispersion liquid into a resin melt in a spraying mode after the thermoplastic resin is completely plasticized, wherein the mass fraction of the composite dispersion liquid is 50% compared with that of the thermoplastic resin, then shearing and mixing the materials through the double-screw extruder to uniformly disperse the composite dispersion liquid in the resin, and obtaining the graphene composite heat-conducting granules after dispersion.

Furthermore, the lampshade cover plate comprises a graphene composite light reflection sheet, a graphene composite light guide sheet and a graphene composite light diffusion sheet which are sequentially arranged from inside to outside, and the graphene composite light reflection sheet, the graphene composite light guide sheet and the graphene composite light diffusion sheet are formed by respectively coating graphene transparent dispersion liquid on different substrates in a spin coating, dip coating, roll coating or spray coating mode and drying.

The preparation method of the transparent graphene dispersion liquid comprises the following steps: firstly, adding 1.5 mass percent of single-layer graphene/graphene oxide into a second dispersion liquid, wherein the sheet diameter of the single-layer graphene/graphene oxide is 1-5um, the second dispersion liquid is formed by mixing 2-4 mass percent of second dispersion liquid and isopropanol, and the second dispersion liquid is formed by mixing sodium polystyrene sulfonate and poly 3, 4-ethylenedioxythiophene according to any proportion. And then dispersing uniformly in an ultrasonic or homogeneous mode to obtain the transparent graphene dispersion liquid. After the graphene transparent dispersion liquid is obtained, the graphene transparent dispersion liquid is coated on a PVA substrate and dried to obtain a graphene composite light reflection sheet, the graphene transparent dispersion liquid is coated on a PC substrate and dried to obtain a graphene composite light guide sheet, and the graphene transparent dispersion liquid is coated on a PS substrate and dried to obtain a graphene composite light diffusion sheet.

Further, the thickness of the coating after the graphene composite light reflection sheet is dried is 1um, the thickness of the coating after the graphene composite light reflection sheet is dried is 0.2um, and the thickness of the coating after the graphene composite light diffusion sheet is dried is 0.3 um.

Example 5

A preparation method of a graphene heat-dissipation eye-protection desk lamp comprises the steps of respectively preparing a base, a support, a lampshade shell and a lampshade cover plate, and then assembling the base, the support, the lampshade shell, the lampshade cover plate and LED lamp beads to form the desk lamp.

Further, the base, the bracket and the lamp shade shell are all formed by injection molding of graphene composite heat conduction granules, and the preparation method of the graphene composite heat conduction granules comprises the following steps:

step 1: adding 20 parts of graphene, 18 parts of graphite nanosheets and 8 parts of heat-conducting fiber filler into a first dispersion liquid, wherein the first dispersion liquid is formed by uniformly mixing 3 parts of first dispersing agent and 90 parts of deionized water; and then stirring at a high speed for pre-dispersing for 25min, then dispersing for 65min in a homogenizing or sanding manner, and obtaining the composite dispersion after dispersion.

In this step, the graphene refers to intrinsic graphene having 1-10 layers and a transverse dimension of 1-5 um. The graphite nanosheet is a graphite nanosheet heat-conducting fibrous filler with 10-100 layers and a transverse size of 5-10um, and is a multiwall carbon nanotube or carbon fiber with a diameter of 1-50nm and a length of 1-30 um. The first dispersant is a mixture of polyacrylamide and chitosan in any proportion.

Step 2: adding thermoplastic resin into a double-screw extruder, adding the composite dispersion liquid into a resin melt in a spraying mode after the thermoplastic resin is completely plasticized, wherein the mass fraction of the composite dispersion liquid is 25% compared with that of the thermoplastic resin, then shearing and mixing the materials through the double-screw extruder to uniformly disperse the composite dispersion liquid in the resin, and obtaining the graphene composite heat-conducting granules after dispersion.

Furthermore, the lampshade cover plate comprises a graphene composite light reflection sheet, a graphene composite light guide sheet and a graphene composite light diffusion sheet which are sequentially arranged from inside to outside, and the graphene composite light reflection sheet, the graphene composite light guide sheet and the graphene composite light diffusion sheet are formed by respectively coating graphene transparent dispersion liquid on different substrates in a spin coating, dip coating, roll coating or spray coating mode and drying.

The preparation method of the transparent graphene dispersion liquid comprises the following steps: firstly, adding 1.8 mass percent of single-layer graphene/graphene oxide into a second dispersion liquid, wherein the sheet diameter of the single-layer graphene/graphene oxide is 1-5um, the second dispersion liquid is formed by mixing 1-5 mass percent of second dispersion agent and isopropanol, and the second dispersion agent is sodium polystyrene sulfonate. And then dispersing uniformly in an ultrasonic or homogeneous mode to obtain the transparent graphene dispersion liquid. After the graphene transparent dispersion liquid is obtained, the graphene transparent dispersion liquid is coated on a PVA substrate and dried to obtain a graphene composite light reflection sheet, the graphene transparent dispersion liquid is coated on a PC substrate and dried to obtain a graphene composite light guide sheet, and the graphene transparent dispersion liquid is coated on a PS substrate and dried to obtain a graphene composite light diffusion sheet.

Further, the thickness of the coating after the graphene composite light reflection sheet is dried is 0.5um, the thickness of the coating after the graphene composite light guide sheet is dried is 0.8um, and the thickness of the coating after the graphene composite light diffusion sheet is dried is 0.6 um.

Example 6

The applicant has carried out the following tests on the table lamps prepared by the methods described in examples 1 to 5:

1. the thermal conductivity performance of the graphene composite thermal conductive plastic is tested and is shown in the following table 1:

2. heat radiation performance test of lamp

Common plastic materials are used, and the light reflection sheet, the light guide column, the heat diffusion sheet and the like are all made of common plastics for comparison, so that the temperature of the LED lamp bead nodes is as shown in the following table 2:

3. the illuminance, light uniformity and blue light absorption effect were compared, and the test results are shown in table 3 below:

conclusion analysis:

1. as can be seen from the above table 1, the thermal conductivity of the thermal conductive plastic prepared by using three different two-dimensional sizes of graphene, graphene nanosheets and a small amount of fibrous filler is improved from 0.2W/mK to 50W/mK compared with that of the conventional thermal conductive plastic.

2. From the above table 2, it can be seen that after the graphene composite thermal conductive plastic is combined with the graphene coating, the temperature of the LED lamp can be reduced by about 20 ℃ to the maximum, and the excellent heat dissipation performance is achieved

3. From last 3 can know, through carry out the spraying or the coating film of graphite alkene on light reflectance membrane, leaded light post and photodiffusion piece, improved the working face illuminance degree of consistency, make the light-emitting more even, not dazzling, the active absorption LED blue light more is favorable to the eyeshield.

While the invention has been described with reference to specific embodiments, any feature disclosed in this specification may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise; all of the disclosed features, or all of the method or process steps, may be combined in any combination, except mutually exclusive features and/or steps.