KR20180083589A - Heat Sink Plastic for 3D Print and Method for Manufacturing Heat Sink Plastic for 3D Print Therefor - Google Patents

Abstract

The present invention relates to a heat-resistant plastic for three-dimensional (3D) printing and a production method thereof. To this end, a filament for 3D printing is produced by mixing an acrylonitrile-butadien-styrene (ABS) resin for improving interlayer adhesiveness and carbon nanotube (CNT) having favorable thermal properties such as thermal conductivity and thermal emissivity upon 3D printing on a polycarbonate (PC) material having excellent mechanical properties, thereby saving materials and improving heat dissipation effects.

Description

Technical Field [0001] The present invention relates to a heat-dissipating plastic for 3D printing,

The present invention relates to a method of manufacturing a heat-radiating plastic for 3D printing, and more particularly, to a PC material having good mechanical properties, an ABS resin for improving interlayer adhesion at the time of 3D print output, CNTs having good thermal properties such as thermal conductivity and thermal emissivity, The present invention relates to a heat-radiating plastic for 3D printing and a method of manufacturing the same.

In the LED lighting industry, there is always a problem of heat as a factor that affects performance.

The LED, which is both a light emitting device and a heating device, generates less than 30% of the current flowing into the light energy, and the remaining LEDs are converted into heat energy. At this time, if the generated heat is not rapidly processed, it affects the LED chip as well as the peripheral circuit, which causes the reliability of the product to deteriorate.

LED lighting is a product problem due to accumulated heat shock over a long period of time.

In fact, more than 50% of LED lights are caused by heat generation, and the remaining humidity, vibration, shock, dust, etc. appear.

Current trend of LED lighting can be defined as high output, small size, light weight, low cost.

In the case of LED lighting, the amount of heat generated by the LED lighting increases, but the density of heat generated by the LED lighting is increased due to the reduction of the heat emitting space.

LED lamps, security lamps and other high-power products are natural cooling methods by heat sinks, so it is difficult to expect effective heat dissipation, and a cooling fan can be installed to provide a forced cooling effect.

However, such a cooling method has a problem that not only the noise occurs but also the design restriction of the product.

In order to solve such problems, the present invention relates to a method of manufacturing a 3D printing filament by mixing an ABS resin for improving interlaminar adhesion and a CNT having good thermal properties such as thermal conductivity and thermal emissivity in a PC material having good mechanical properties, And to provide a heat-dissipating plastic for 3D printing and a method of manufacturing the same.

According to an aspect of the present invention, there is provided a method of manufacturing a heat-

Preparing a mixture of CNT (Carbon Nano Tube) and ABS (Acrylonitrile Butadiene Styrene) resin based on polycarbonate (PC) at a constant ratio;

Extruding the mixture by an extruder to produce a molded product; And

Wherein the composition comprises 55 to 65% by weight of ABS, 10 to 15% by weight of CNT and 20 to 25% by weight of PC. do.

According to a feature of the present invention, there is provided a method of manufacturing a heat-

Preparing a solution by dissolving the resin in an acrylic resin with a solvent (Isophoron), adding a heat-generating additive and a dispersant to the solution, and preparing a heat-dissipating ink;

Preparing a mixture of CNT (Carbon Nano Tube) and ABS (Acrylonitrile Butadiene Styrene) resin based on polycarbonate (PC) at a constant ratio;

Extruding the mixture by an extruder to produce a molded product;

Coating the molded article with the heat radiation ink; And

Wherein the composition comprises 55 to 65 wt.% Of ABS, 10 to 15 wt.% Of CNT and 20 to 25 wt.% Of PC. .

According to a feature of the present invention, there is provided a method of manufacturing a heat-

Preparing a solution by dissolving the resin in an acrylic resin with a solvent (Isophoron), adding a heat-generating additive and a dispersant to the solution, and preparing a heat-dissipating ink;

Preparing a mixture by mixing a thermoplastic polymer, carbon nanotubes (CNT) and ABS (acrylonitrile butadiene styrene) resin and aluminum at a constant ratio;

Extruding the mixture by an extruder to produce a molded product;

Coating the molded article with the heat radiation ink; And

Wherein the composition comprises 25 wt% of a thermoplastic polymer, 15 wt% of carbon nanotubes, 30 wt% of graphite, 25 wt% of ABS, 5 wt% of aluminum By weight.

According to a feature of the present invention, a heat-

55 to 65% by weight of ABS (Acrylonitrile Butadiene Styrene), 10 to 15% by weight of carbon nanotubes (CNT), and 20 to 25% by weight of polycarbonate.

According to the above-described constitution, the present invention provides a method for manufacturing a 3D printing filament by mixing an ABS resin for improving interlaminar adhesion at the time of 3D printing and a CNT having good thermal properties such as a thermal conductivity and a thermal emissivity to a PC material having good mechanical properties, And the effect of reducing the process and improving the heat radiation effect.

1 is a view showing a method of manufacturing a heat-radiating plastic for 3D printing according to a first embodiment of the present invention.
2 is a view showing a method of manufacturing a heat-radiating plastic for 3D printing according to a second embodiment of the present invention.
3 is a view showing a method of manufacturing a heat-radiating plastic for 3D printing according to a second embodiment of the present invention.
4 is a view showing an example of an LED illumination heat discharging body using a 3D heat radiating plastic according to an embodiment of the present invention.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

1 is a view showing a method of manufacturing a heat-radiating plastic for 3D printing according to a first embodiment of the present invention.

A method of manufacturing a heat-radiating plastic for 3D printing according to an embodiment of the present invention is a method of manufacturing a heat-radiating plastic for 3D printing by mixing CNT (Carbon Nano Tube) and ABS (Acrylonitrile Butadiene Styrene) resin at a predetermined ratio based on polycarbonate Make the filament to be used.

First, a mixture is prepared by mixing a thermoplastic resin and CNT (S100).

The thermoplastic resin means a polymer such as polyethylene or polyvinyl chloride, which recovers when heated and hardens again upon cooling. These materials can be shaped into various shapes by heating.

When heat is applied after heat treatment, it can be deformed by heat again, so that it can be efficiently processed by extrusion molding or injection molding.

The thermoplastic resin includes a crystalline thermoplastic resin and an amorphous thermoplastic resin.

The crystalline thermoplastic resin includes polyethylene, nylon, polyacetal resin, polycarbonate (PC) and the like, and it is particularly preferable to use PC.

The amorphous thermoplastic resin includes transparent resins such as vinyl chloride resin, polystyrene, ABS (Acrylonitrile Butadiene Styrene) resin and acrylic resin. In the case of a filament for 3D printing, an ABS resin is added to increase the interlaminar adhesion between PC and CNT .

CNT (Carbon Nano Tube) is formed in the form of six carbon hexagons connected to each other to form a tube. The diameter of the tube is from a few nanometers to a few tens of nanometers and is called a carbon nanotube.

The nanometer is 1/1000000000000000000000000000000000000000000000000000000000000000000000000 one meter of the normal thickness of hair. Its electrical conductivity is similar to that of copper, its thermal conductivity is the highest in nature, and its strength is 100 times better than steel. Carbon fibers can be broken even if they are deformed by only 1%, while carbon nanotubes can withstand 15% deformation.

More specifically, the composition ratio of the mixture is 55 to 65 wt% of ABS, 10 to 15 wt% of CNT, and 20 to 25 wt% of PC. Preferably, the composition ratio of the mixture comprises 62.5 wt.% Of ABS, 15 wt.% Of CNT and 22.5 wt.% Of PC.

Next, in the plastic heat sink for lighting, the mixture is extruded by an extruder to produce a molded product (S102). At this time, the extrusion process is carried out at a temperature of 190 to 250 ° C. so that the polymer resin is extruded in a semi-molten state which is an intermediate type of liquid and solid.

Next, the plastic heat discharging element for illumination is wound by passing the molded product discharged from the extruder between two rollers spaced apart at regular intervals to produce a filament for 3D printing (S104).

2 is a view showing a method of manufacturing a heat-radiating plastic for 3D printing according to a second embodiment of the present invention.

A method of manufacturing a heat-radiating plastic for 3D printing according to a second embodiment of the present invention includes a step S200 of producing a heat-dissipating ink, a step of forming a carbon nanotube (CNT) and an acrylonitrile (ABS) based on a polycarbonate (S204) of mixing the heat-dissipating ink with the heat-dissipating ink (S206); and a step (S204) of mixing the heat-dissipating ink with the heat- And a step (S208) of fabricating the filament for 3D printing by winding the coated molding while passing between two rollers spaced apart at regular intervals.

The heat dissipation ink is prepared by dissolving an acrylic resin in a solvent (Isophoron) to prepare a solution, and adding a heat dissipating additive and a dispersant to the solution to prepare a heat dissipation ink.

The heat-radiating additive may be selected from the group consisting of length-controlled carbon nanofibers, carbon nanotubes, graphite, graphene, metal-carbon nanocomposite materials, aluminum oxide, magnesium oxide, silica, aluminum nitride, zinc oxide, Any one or more selected can be used.

On the other hand, the heat dissipation additive is dispersed by the milling method. More specifically, the method of applying at least one of ball milling, roll milling, induction milling, planetary ball milling, jet milling, ultrasonic or screw mixing milling .

Preferably, the composition ratio of the heat dissipation ink is 2.5% by weight of graphene as a filler, 94% by weight of an acrylic resin, and 1% by weight of a dispersant, Antiterra-U.

The heat-radiating ink is coated and cured on the formed product by mixing 55 to 65 wt% of ABS, 10 to 15 wt% of CNT and 20 to 25 wt% of PC. The coating of the heat radiation ink may be performed by any one of a spray coating method, a doctor blade method, a screen coating method, a roll coating method, a spin coating method and a deposition method. Also, post-coating curing can be done in a thermosetting manner.

3 is a view showing a method of manufacturing a heat-radiating plastic for 3D printing according to a third embodiment of the present invention.

A method of manufacturing a heat-radiating plastic for 3D printing according to a third embodiment of the present invention includes the steps of (S300) manufacturing a heat radiation ink, a step of mixing thermoplastic polymer, dispersed CNT, graphite, ABS resin, (S302), a step S304 of forming a molded product having a predetermined size by injecting the mixed mixture into an extruder, a step S306 of coating the heat dissipation ink on the molded product, and a step And winding and winding the filaments between two spaced apart rollers to manufacture a filament for 3D printing (S308).

Thermally conductive plastics are used for the shielding of electromagnetic waves, thermoplastic polymers for molding, dispersed carbon nanotubes (CNTs) for heat conduction, and graphite for heat conduction for economical production and moldability. .

In the 3D printing method, a solid plastic is pulled out like a thread by a resin extrusion method, and this is gradually melted and accumulated. However, if the interfacial adhesion is not high, there is a problem of separation. Therefore, in addition to thermoplastic polymers, carbon nanotubes, and graphite, ABS is added to improve interfacial adhesion, and aluminum is added to further increase the thermal conductivity.

At this time, the thermoplastic polymer exhibits very low thermal conductivity and electromagnetic wave shielding of 0.2 W / mk, but due to the addition of carbon nanotubes, graphite and aluminum dispersed in the thermoplastic polymer, thermal conductivity of about 100 W / mK and electromagnetic wave shielding Absorbent property.

In order to achieve such performance, the thermoplastic polymer may be selected from any one selected from polyphenylene sulfide (PPS), thermoplastic polyurethane (TPU), polycarbonate resin (PC RESIN), polyamide 6 (PA6), polyamide 66 Or one or more polymer plastic materials, and such thermoplastic polymers are used in a weight range of about 35% to 65% for moldability.

The composition ratio of the mixture of the present invention includes 25% by weight of a thermoplastic polymer, 15% by weight of carbon nanotubes, 30% by weight of graphite, 25% by weight of ABS and 5% by weight of aluminum.

4 is a view showing an example of an LED illumination heat discharging body using a heat-radiating plastic for 3D printing according to an embodiment of the present invention.

The 3D printing filament 200 of the first embodiment, the 3D printing filament 300 of the second embodiment, and the 3D printing filament 400 of the third embodiment have the same advantages as those of the 3D printing method 310, and 410 are manufactured in such a manner that the solid plastic is pulled out like a thread by the resin extrusion method, and the solid plastic is melted and piled up little by little. 310, and 410 are connected to the LED 100 through heat sinks for heat dissipation.

The 3D printing method can be classified into three types: FDM (Fused Deposition Modeling), DLP (Digital Light Processing), SLA (Stereolithography), SLS (Selective Laser Sintering), Polyjet (Photopolymer Jetting Technology), DMT head 3dprinting, and LOM (Laminated Object Manufacturing). The nozzle head of the 3D printer may have a joint link for supplying the print material in the 3-axis to 5-axis direction.

As another embodiment, a thin plating layer 500 is formed on the surfaces of the LED light emitting elements 210, 310, and 410 manufactured.

The plating may be performed by plating at least one of nickel, black nickel, chromium, bronze, and brass to 10 to 100 mu m in order to improve the protection and beauty of the light emitting element and further improve heat conduction, Lt; RTI ID = 0.0 > m. ≪ / RTI >

The embodiments of the present invention described above are not implemented only by the apparatus and / or method, but may be implemented through a program for realizing functions corresponding to the configuration of the embodiment of the present invention, a recording medium on which the program is recorded And such an embodiment can be easily implemented by those skilled in the art from the description of the embodiments described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

100: LED
200: Filament for 3D printing of the first embodiment
210: LED light source
300: filament for 3D printing of the second embodiment
310: LED light source
400: Filament for 3D printing of the third embodiment
410: LED light source
500: plated layer

Claims (5)

Preparing a mixture of CNT (Carbon Nano Tube) and ABS (Acrylonitrile Butadiene Styrene) resin based on polycarbonate (PC) at a constant ratio;
Extruding the mixture by an extruder to produce a molded product; And
Wherein the composition comprises 55 to 65% by weight of ABS, 10 to 15% by weight of CNT and 20 to 25% by weight of PC. Of the heat-dissipating plastic for 3D printing. Preparing a solution by dissolving the resin in an acrylic resin with a solvent (Isophoron), adding a heat-generating additive and a dispersant to the solution, and preparing a heat-dissipating ink;
Preparing a mixture of CNT (Carbon Nano Tube) and ABS (Acrylonitrile Butadiene Styrene) resin based on polycarbonate (PC) at a constant ratio;
Extruding the mixture by an extruder to produce a molded product;
Coating the molded article with the heat radiation ink; And
Wherein the composition comprises 55 to 65 wt.% Of ABS, 10 to 15 wt.% Of CNT and 20 to 25 wt.% Of PC. Wherein the heat-dissipating plastics are thermally decomposed. Preparing a solution by dissolving the resin in an acrylic resin with a solvent (Isophoron), adding a heat-generating additive and a dispersant to the solution, and preparing a heat-dissipating ink;
Preparing a mixture by mixing a thermoplastic polymer, carbon nanotubes (CNT) and ABS (acrylonitrile butadiene styrene) resin and aluminum at a constant ratio;
Extruding the mixture by an extruder to produce a molded product;
Coating the molded article with the heat radiation ink; And
Wherein the composition comprises 25 wt% of a thermoplastic polymer, 15 wt% of carbon nanotubes, 30 wt% of graphite, 25 wt% of ABS, 5 wt% of aluminum By weight based on the total weight of the thermosetting resin. The method according to claim 2 or 3,
Wherein the composition ratio of the heat dissipation ink includes 2.5 wt% of graphene as a filler, 9 wt% of CNT, 94 wt% of an acrylic resin, and 1 wt% of a dispersant, Antiterra-U. 55 to 65 wt% of ABS (acrylonitrile butadiene styrene), 10 to 15 wt% of carbon nanotubes (CNT), and 20 to 25 wt% of polycarbonate.

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