Non-contact liquid heat dissipation material remixing device and liquid heat dissipation material remixing method using same

Abstract

Proposed are a non-contact liquid heat dissipation material remixing device and a liquid heat dissipation material remixing method using the same, the device and the method being capable of suppressing phase separation of the heat dissipation material through a remixing process of the liquid heat dissipation material while simultaneously controlling a process condition, thereby optimizing the remixing process. In particular, a rotation time and a rotation direction of the heat dissipation material and the inclination of the container containing the material are adjusted, thereby enhancing mixability between a polymer resin and thermally conductive particles and improving heat dissipation characteristics.

Description

Technical Field

[0001] The present disclosure relates to a non-contact liquid heat dissipation material remixing device and a liquid heat dissipation material remixing method using the same. More particularly, the present disclosure relates to a non-contact liquid heat dissipation material remixing device and a liquid heat dissipation material remixing method using the same, in which phase separation of the heat dissipation material is suppressed through a remixing process of the liquid heat dissipation material, while a process condition is controlled, thereby optimizing the remixing process.Background Art

[0002] In various electronic devices used in the vehicle, electrical, and electronic fields, multifunctionality and flexibility are pursued, while reduced weight, reduced thickness, and reduced size are also sought. However, due to high integration, heat that may affect the operation of electronic devices may be generated in electronic components constituting the electronic devices. Such heat generation not only degrades the function of the corresponding component but may also cause malfunction of adjacent components, and thus must be controlled. Accordingly, research on this issue has been widely conducted in recent years.

[0003] In particular, electrically insulating yet thermally dissipative insulating heat-dissipation materials have been in the limelight as materials applicable to LEDs, energy storage systems, and next-generation integrated circuits, and thus development thereof has been widely carried out.

[0004] In the meantime, in batteries for electric vehicles, localized temperature differences or high temperatures occur due to heat generated by high output, high speed, and repeated charging, and thus a thermal runaway phenomenon that degrades the efficiency and stability of the battery occurs. Such problems are caused by insufficient capability to dissipate and diffuse heat to the outside relative to the heat generated inside the battery.

[0005] To address this issue, structures for dissipating heat using components such as heat pipes were previously considered. However, since such structures occupy a large volume and weight, it has been recognized that, as a method for reducing volume in pursuit of slimness, it is more efficient to use a heat dissipation paste (TIM; thermal interface material) in which thermally conductive particles are dispersed in a polymer.

[0006] A heat dissipation paste is generally manufactured by applying metal or ceramic particles having high thermal conductivity as a filler and dispersing the particles in a polymer matrix (substrate or base material). In the case of a high heat dissipation paste, a typical filler is generally blended into a polymer resin at a level ranging from 20 to 90 % by weight, thereby achieving a thermal conductivity of about 0.1 to 40 W / mK. The most common high heat dissipation paste achieves a thermal conductivity of 10 W / mK or higher by blending particles having various shapes and sizes into a polymer resin at a level ranging from 20 to 90 % by weight.

[0007] The problem is that, in manufacturing a heat dissipation material including a heat dissipation paste, it is necessary to uniformly apply the heat dissipation paste in a thin film form, but depending on a storage environment of the paste, nonuniform application or formation of agglomerates occurs. In particular, since the thermally conductive particles and the polymer constituting the heat dissipation paste have different specific gravities, separation may occur due to the difference in specific gravity as time elapses after mixing, causing the thermally conductive particles to settle.

[0008] In order to address these problems, a method has been proposed in which a heat dissipation paste is put into a container in a batch manner and remixing is performed by dispersing and agitating the paste through rotation of an agitator blade. However, re-mixing using an agitator blade makes it difficult to achieve completely uniform agitation, and undispersed materials (solid foreign matter) may be generated due to adhered materials in the container or retained materials near a shape of the agitator blade where dispersion is not performed. Above all, air may be entrained into the paste during insertion and rotation processes of the agitator blade, which may cause an orange peel phenomenon during application of the paste.Disclosure Technical Problem

[0009] The present disclosure has been made keeping in mind the above problems occurring in the related art, and is directed to providing a non-contact liquid heat dissipation material remixing device and a liquid heat dissipation material remixing method using the same, in which phase separation of the heat dissipation material is suppressed through a remixing process of the liquid heat dissipation material, while a process condition is controlled, thereby optimizing the remixing process.Technical Solution

[0010] The present disclosure relates to a non-contact liquid heat dissipation material remixing device and a liquid heat dissipation material remixing method using the same.

[0011] According to an aspect of the present disclosure, there is provided a liquid heat dissipation material remixing method including: a) preliminarily agitating material through pumping; b) filtering the preliminarily agitated material; and c) supplying the filtered material to an agitator provided with a rotating member rotating therein and a vacuum device, and performing continuous agitation and defoaming processing while changing a rotation direction at predetermined time intervals.

[0012] In the present disclosure, the rotating member may have a holding time of the rotation direction of 1 second to 5 seconds, and a rotational speed of 20 rpm to 40 rpm. In addition, the vacuum device may be operated for 10 minutes to 30 minutes, and may have a vacuum pressure of 0.04 torr to 40 torr.

[0013] According to another aspect of the present disclosure, there is provided a non-contact liquid heat dissipation material remixing device including: a squeezing part configured to remove packaging of a container; a preliminary agitating pumping part configured to pump material in the container to perform preliminary agitation; and a remixing part configured to perform defoaming of the material by rotating the container and creating a vacuum inside the container.

[0014] In the present disclosure, the remixing part may include: a rotary table configured to support the container containing the material so that the container is rotated freely; a rotational driving part configured to rotate the rotary table in a clockwise direction or a counterclockwise direction; a vacuum part connected to an opening of the container and configured to create a vaccum inside the container and induce defoaming of the material; and a controller configured to control a rotational speed, a rotation direction, and a rotation application time of the rotational driving part, and a vacuum pressure and a pressure application time of the vacuum part. The remixing part may further include an angle adjustment part at a lower end of the rotary table such that the rotary table has an angle of 5° to 20° with respect to a ground surface about a rotation axis.Advantageous Effects

[0015] A non-contact liquid heat dissipation material remixing device and a liquid heat dissipation material remixing method using the same according to the present disclosure can suppress phase separation of the heat dissipation material through a remixing process of the liquid heat dissipation material while simultaneously controlling a process condition, thereby optimizing the remixing process. In particular, a rotation time and a rotation direction of the heat dissipation material and the inclination of the container containing the material are adjusted, thereby enhancing mixability between a polymer resin and thermally conductive particles and improving heat dissipation characteristics.Description of Drawings

[0016] FIG. 1 shows a workflow diagram of a liquid heat dissipation material remixing method using a non-contact liquid heat dissipation material remixing device according to the present disclosure. FIG. 2 shows a squeezing part of a non-contact liquid heat dissipation material remixing device according to the present disclosure. FIG. 3 shows a preliminary agitating pumping part of a non-contact liquid heat dissipation material remixing device according to the present disclosure. FIGS. 4 and 5 show a remixing part of a non-contact liquid heat dissipation material remixing device according to the present disclosure. FIGS. 6 to 11 show visual observations of a material state before and after remixing under the conditions of Tables 1 and 4. FIG. 12 shows visual observations of a material state before and after remixing under the conditions of Table 9. FIG. 13 shows visual observations of a material state before and after remixing under the conditions of Table 11. |Rule 91, 20.06.2025 * Detailed Description of Main Reference Numerals in Drawings*

[0017] 100 :squeezing part 110 :squeezing roller 120 :transfer roller 130 :driving part 200 :preliminary agitating pumping part 210 :agitating pump 220 :filtration part 300 :remixing part 310 :rotary table 320 :rotational driving part 330 :vacuum part 340 :controller 350 :angle adjustment part A :container Best Mode

[0018] Hereinafter, a non-contact liquid heat dissipation material remixing device and a liquid heat dissipation material remixing method using the same according to the present disclosure will be described in detail with reference to specific examples. The specific examples introduced below are provided as examples so that the idea of the present disclosure can be sufficiently transferred to those skilled in the art to which the present disclosure pertains.

[0019] Accordingly, the present disclosure is not limited to the specific examples presented below and may be embodied in other forms, and the specific examples set forth below are provided merely to clarify the idea of the present disclosure and are not intended to limit the present disclosure thereto.

[0020] Herein, unless otherwise defined, technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present disclosure pertains. In the following description, descriptions of known functions and configuration that make the gist of the present disclosure unclear will be omitted.

[0021] In addition, unless otherwise clearly indicated by the context, the singular forms used in the specification and the appended claims are intended to include the plural forms as well.

[0022] In addition, in describing element of the present disclosure, terms such as first, second, A, B, (a), and (b) may be used. Such terms are used only to distinguish one element from another and do not limit the nature, order, or sequence of the corresponding elements by such terms. It will be understood that when an element is referred to as being "coupled", "linked", or "connected" to another element, it can be directly coupled or connected to the other element or another elements may be "coupled", "linked", or "connected" between the elements.

[0023] A liquid heat dissipation material remixing method according to the present disclosure may include: a) preliminarily agitating material through pumping; b) filtering the preliminarily agitated material; and c) supplying the filtered material to an agitator provided with a rotating member rotating therein and a vacuum device, and performing continuous agitation and defoaming processing while changing a rotation direction at predetermined time intervals.

[0024] In the present disclosure, the step a) is a step of preliminarily agitating the material through pumping, thereby suppressing phase separation and an agglomeration phenomenon caused by a difference in specific gravity of the mixture through mixing of the material and increasing efficiency of continuous agitation and defoaming processing, which will be described later.

[0025] The container has an inner wall surface of a substantially cylindrical shape and defines a cylindrical space having a predetermined length in an upward-downward (length) direction, the space being filled with a material.

[0026] One end of the container in the length directon is sealed with the same material as the inner wall surface, and an opening through the above-described material is put is formed at the other end of the container. Such an opening may be sealed after a material is put into the container in order to prevent deterioration of the material. Herein, a method of sealing the opening is not limited in the present disclosure, and the opening may be sealed with a plastic lid or vinyl. Accordingly, before performing the step a), a process of removing a sealing means, such as vinyl, should be performed in advance, which will be described later.

[0027] In the present disclosure, the material collectively refers to a heat dissipation paste that is used for a heat dissipation material, and may include a polymer resin, thermally conductive powder, a dispersant, and a solvent.

[0028] In the present disclosure, the polymer resin is not particularly limited as long as it maintains a past form, disperses thermally conductive powder, and has heat resistance and adhesive properties. Examples of such resins include polyester resins, epoxy resins, polyolefin resins, polyurethane resins, fluororesins, phenolic resins, acrylic resins, polycarbonate resins, and silicone resins, among which a silicone resin is preferable.

[0029] Examples of the silicone resin include hexamethyldisiloxane, decamethylcyclopentasiloxane, octamethylcyclotetrasiloxane, dimethyldisilane, polydimethylsiloxane, trimethylchlorosilane, dimethylchlorosilane, octadecylsilane, octadecyltrichlorosilane, octadecyltrimethoxysilane, and phenyl dimethyl ethoxysilane, and these may be used alone or in a mixture of two or more thereof.

[0030] The thermally conductive powder serves to lower the temperature of high-temperature regions by promoting heat diffusion and to transfer heat to low-temperature regions for diffusion to the surroundings, and basically, it is preferable to add metals, metal compounds, or carbon components having high thermal conductiveness in a particle form.

[0031] Examples of the thermally conductive powder include carbon black, carbon nanotubes, magnesium oxide, zirconia, alumina, and titania, and these may be used alone or in a mixture of two or more thereof.

[0032] The dispersant serves to facilitate dispersion of the thermally conductive powder within the polymer resin, and although the type of the dispersant is not limited, it is preferable, from the standpoint of preventing agglomeration of the powder, to include BYK-170, which is a product name of BYK Chemie.

[0033] The solvent serves to dissolve the polymer resin or the dispersant, and is not limited in type as long as it can achieve the above-described purpose. Examples of such solvents include water, alcohol-based solvents, ketone-based solvents, amine-based solvents, ester-based solvents, amide-based solvents, halogenated hydrocarbon-based solvents, ether-based solvents, and furan-based solvents. More specifically, the solvent may include one or more selected from the group of isopropyl alcohol, diisopropyl alcohol, methanol, ethanol, methyl ethyl ketone, cyclohexane, ethylene glycol monoethyl ether, ethylene glycol ethyl ether, ethylene glycol diethyl ether, ethylene glycol monoethyl ether acetate, distilled water, propanol, isopropanol, butanol, purified water, and glycerol.

[0034] In addition, the material may be a two-component type in which a main material and a curing agent are separated, as necessary. In this case, each material may be separately subjected to preliminary agitation and filtration, and may be mixed during a continuous agitation and defoaming process, which will be described later.

[0035] Herein, the curing agent may be added in the form of a composite, and may include, for example, a curing agent, a curing catalyst, and a solvent.

[0036] Examples of the curing agent include amine-based curing agents, imidazole-based curing agents, and acid anhydride-based curing agents. More specifically, the curing agent may include benzyl dimethylamine, triethanolamine, triethyl tetramine, diethylenetriamine, triethylene amine, dimethylaminoethanol, imidazole, isoimidazole, 2-methylimidazole, butylimidazole, 2-heptadecenyl-4-methylimidazole, 2-undecenylimidazole, 1-vinyl-2-methylimidazole, 2-heptadecylimidazole, 2-phenylimidazole, 1-benzyl-2-methylimidazole, 1-propyl-2-methylimidazole, 1-cyanoethyl-2-methylimidazole, phthalic anhydride, maleic anhydride, trimellitic anhydride, pyromellitic anhydride, hexahydrophthalic anhydride, tetrahydrophthalic anhydride, methylnadic anhydride, nadic anhydride, and methylhexahydrophthalic anhydride.

[0037] Examples of the curing catalyst include dodecylbenzenesulfonic acid and p-toluenesulfonic acid, and these may be used alone or in a mixture of two or more thereof.

[0038] In the present disclosure, the step a) is provided to mix the material to a particular extent before full-scale agitation of the above-described components, and in the case of a two-component type including a main material and a curing agent, it is preferable that preliminary agitation is performed separately.

[0039] Herein, in order to achieve uniform mixing of the respective components, it is preferable to use an agitator as necessary. Such an agitator may perform agitation by rotating a container containing the material, or by immersing the propeller-shaped agitator blade in the material and rotating the agitator blade.

[0040] Specifically, when the agitator blade is used, one or more agitator blades rotating at high speed around a vertical rotation shaft are provided, and the process is performed by immersing the agitator blade in the composite and rotating the agitator blade. Herein, when two or more agitator blades are provided, it is preferable that the agitator blades have different diameters from each other.

[0041] For example, an agitator blade having a small diamete may operate at a higher rotational speed than an agitator blade having a large diameter, thereby mixing the material more easily. The agitator blade having a large diameter has a lower mixing rate of the material but may stir a wider region than the agitator blade having a small diameter, thereby uniformizing the mixing state.

[0042] In addition, the container containing the material may be surrounded by a temperature control medium as necessary, and by controlling temperature during preliminary agitation, agitation speed and efficiency may be increased.

[0043] The step a) may be performed once or multiple times. After such preliminary agitation is completed, a process of transferring the material in a slurry form to a storage tank or another container through a pump and then filtering the material may be performed (step b)).

[0044] In the step b), first, a predetermined amount of excessively agglomerated solid components or other residues is collected from the material that has undergone the step a), and then the material is transferred to a temporary storage tank by using the pump.

[0045] The temporary storage tank may be provided with an agitator, such as an agitator blade, similarly to the step a), thereby facilitating mixing of the composite and suppressing formation of precipitates. In addition, a temperature-adjustable control medium may be further provided as necessary, thereby adjusting fluidity and mixability of the material.

[0046] The material transferred to the temporary storage tank may remove bubbles, solid components, or various foreign substances through a filter unit. In particular, when the material is stirred using the above-described agitator, air may frequently be entrained into the material. Since such bubbles is a cause of degrading performance of the paste, the material may be pressure-filtered using a filter to remove such bubbles together with foreign substances.

[0047] The filter used at this time may be a known filtration filter, and the pore size of the filter, the amount of the material passing per unit time, or pressure loss may be freely adjusted according to a composition ratio of solid components required for the material or a pressure applied to the tank, without being limited thereto.

[0048] For example, due to characteristics of a heat dissipation paste, the material may have an increased content of solid components such as thermally conductive powder in order to enhance heat dissipation characteristics and reduce drying time and improve productivity. In this case, it is preferable to apply a filter having a large pore size or a large amount of the material passing per unit time. When it is desired to suppress generation of bubbles in order to improve workability, it is preferable to apply a filter having a small pore size or a small amount of the material passing per unit time in order to reduce viscosity.

[0049] In the present disclosure, the step b) does not limite the number of filtration operations, and specifically, it is preferable that the filtration is performed one to three times. After completion of the filtration, it is preferable to refill the container with the material.

[0050] In the present disclosure, the step c) is a step of performing continuous agitation and defoaming processing on the material. In this step, bubbles within the material are completely removed while solid components are uniformly dispersed in the material. In addition, when the material is divided into a main material and a curing agent, the main material and the curing agent may be mixed in this step.

[0051] Describing the step c) in more detail, first, the container containing the material is mounted on a rotary table. Herein, when the material is a multi-component material including two or more components, all the components of the material are mixed in the container and then the container is mounted on the rotary table. Then, when a controller drives a rotational driving part, the rotation is transmitted to the rotary table and the rotary table and the container rotate. Simultaneously, a vacuum part connected to the opening of the rotating container to create a vacuum inside the container and induce defoaming of the material may be connected to the opening of the container and operated to remove bubbles within the material.

[0052] Herein, in the step c), by adjusting, within a predetermined range, a rotating member, more specifically, a rotation direction of the rotary table, a holding time of the rotation direction, a rotational speed, and an operating time of the vacuum device, and the vacuum pressure of the vacuum device, deterioration of the material due to temperature rise and agglomeration and precipitation of the solid components may be suppressed, and the solid components and the polymer resin may be completely and uniformly mixed, and bubbles may be completely removed.

[0053] Specifically, it is preferable that the rotating member performs defoaming while the rotation direction of the rotary table is changed at predetermined time intervals. Herein, it is preferable that the holding time of the rotation direction is 1 second to 5 seconds.

[0054] Herein, the holding time of the rotation direction refers to the time period immediately preceding a change in the rotation direction of the rotary table from one direction to another direction. For example, when the rotary table is rotated in a clockwise direction and then in a counterclockwise direction, if the rotary table is rotated in the clockwise direction for 5 seconds, the holding time of the rotation direction is 5 seconds.

[0055] When the holding time of the rotation direction is less than the range, remixing is not properly performed. When the holding time of the rotation direction exceeds the range, the solid components move away from the rotation axis and tend to adhere to the inner wall of the container or agglomerate, thereby resulting in a decrease in mixability of the material.

[0056] In addition, it is preferable that the rotational speed of the rotating member, specifically, a rotating disk, ranges from 20 rpm to 40 rpm. When the rotational speed is less than the range, bubbles within the material are not properly removed. When the rotational speed exceeds the range, the solid components may adhere to the inner wall of the container or agglomerate, and degeneration of the material may occur due to an increase in temperature caused by friction between the container and the material.

[0057] In addition, the vacuum device operates in a manner of removing bubbles by lowering air pressure inside the container to suction air out of the bubbles. The operating time of the vacuum device is not limited. Since rotation of the container and operation of the vacuum device are performed simultaneously, it is preferable to set the time for complete removal of bubbles through rotation.

[0058] Specifically, it is preferable that the vacuum device operates for 10 to 30 minutes. When the operating time of the vacuum device is less than the range, bubbles are not properly removed. When the operating time of the vacuum device exceeds the range, an agglomeration phenomenon of the solid components may be aggravated along with energy waste.

[0059] In addition, it is preferable that vacuum pressure of the vacuum device ranges from 0.04 torr to 40 torr. When the vacuum pressure is less than the range, bubble removal efficiency may be reduced. When the vacuum pressure exceeds the range, the material may be suctioned into the material vacuum device or mixability of the material may be degraded.

[0060] The present disclosure may include a non-contact liquid heat dissipation material remixing device for the liquid heat dissipation material remixing method as described above. Herein, as shown in FIG. 1, the remixing device may include: a squeezing part 100 configured to remove packaging of a container; a preliminary agitating pumping part 200 configured to perform preliminary agitation by pumping material in the container; and a remixing part 300 configured to perform defoaming of the material by rotating the container and creating a vacuum inside the container.

[0061] In the present disclosure, for a process of removing packaging material from the container containing the material, the squeezing part 100 may include a squeezing roller 110, a transfer roller 120, and a driving part 130 as shown in FIG. 2.

[0062] More specifically, after placing a container (D) on a transfer roller driven in one direction, an end portion of the packaging material (W) is inserted between a pair of squeezing rollers 110 and clamped. In addition, after cutting out a lower end portion of the packaging material, the packaging material is rotated by 90° so as to face the container and the squeezing rollers are operated to completely remove the packaging material. After the packaging material is removed, the container is discharged by moving in one direction through the transfer roller 120. In addition, the removed packaging material is collected and discarded.

[0063] Specifically, as shown in FIG. 2, the squeezing part includes a frame 140 provided with the squeezing rollers, the transfer roller, and the driving part, and the frame includes a left frame and a right frame in a pair that have a shape generally similar to '⊥'. Herein, the left frame and the right frame are spaced apart from each other by a predetermined distance, while their lower ends are connected to each other via connection frames. Between the connection frames, the transfer roller 120 may be provided.

[0064] In addition, the squeezing rollers 110 are provided to connect the upper ends of the left frame and the right frame, and the driving part 130 may be provided at any one of the left and right frames. Through this, rotational force generated by the driving part is transmitted to the squeezing rollers, thereby completely removing the packaging material sealing the upper surface of the container.

[0065] In the present disclosure, the preliminary agitating pumping part 200 is provided to preliminarily agitate the material and remove foreign substances within the material or agglomerated solid components as described above. The preliminary agitating pumping part may include an agitating pump 210 and a filtration part 220.

[0066] In the present disclosure, the agitating pump 210 serves to remove bubbles from the liquid heat dissipation material in the container, and to collect a portion of agglomerated solid components (residuum) and remove or filter the same through a filtration part, which will be described later, thereby increasing uniformity of the heat dissipation material. The agitating pump performs a function of agitating the heat dissipation material inside the container by being in contact with the upper end of the container and lowering pressure inside the container, and transferring bubbles and residues therein to a space (temporary storage tank) of higher pressure. Any device capable of performing the above-described functions is not limited in type or form. In addition, the agitating pump may further include a suction pipe 211 for lowering pressure inside the container, and a temporary storage device (not shown) for storing suctioned residues or air.

[0067] The filtration part 220 serves to filter residues stored in the temporary storage device according to particle size so as to remove foreign substances in the heat dissipation material and reduce loss and increase uniformity of the heat dissipation material, thereby increasing heat dissipation performance. The filtration method is not limited, and examples thereof include natural filtration using a filter, suction filtration by reduced pressure, and pressure filter.

[0068] In addition, during filtration as described above, filtration conditions may be varied according to a particle diameter of solid components contained in the heat dissipation material. For example, in the case of natural filtration using a filter, a pore size of the used filter is adjusted to be greater than a particle diameter of solid components, thereby increasing filtration efficiency.

[0069] Describing the operation of the preliminary agitating pumping part 200 in detail, first, as shown in FIG. 1, the container that has passed through the squeezing part is transferred to the lower end of the agitating pump 210, and then the agitating pump is operated. Herein, the agitating pump provided with the suction pipe 211 for suctioning the material transfers the material to a temporary storage tank 212, and the material transferred to the temporary storage tank is again passed through the filtration part 220 shown in FIG. 3, thereby removing foreign substances or agglomerated solid components therein. The material that has passed through the filtration part is refilled into the container, and the container filled with the material is moved to the remixing part.

[0070] In the present disclosure, the remixing part 300 serves to remove bubbles within the material and completely mix components. Specifically, the remixing part may include: a rotary table 310 configured to support the container containing the material so that the container is rotated freely; a rotational driving part 320 configured to rotate the rotary table in a clockwise direction or a counterclockwise direction; a vacuum part 330 connected to an opening of the container and configured to create a vaccum inside the container and induce defoaming of the material; and a controller 340 configured to control a rotational speed, a rotation direction, and a rotation application time of the rotational driving part, and a vacuum pressure and a pressure application time of the vacuum part.

[0071] More specifically, when the container that has passed through the preliminary agitating pumping part is fixed on the rotary table of the remixing part, the vacuum part moves from an upper position to a lower position to completely surround the container or at least completely surround the opening of the container to make the inside of the container airtight. In addition, the rotational driving part is operated to rotate the rotary table in a clockwise direction or a counterclockwise direction. Simultaneously, the vacuum part is operated to air pressure inside the container and burst bubbles, thereby performing defoaming.

[0072] Herein, the controller may receive the above-described conditions and control the rotational driving part or the vacuum part. For example, the controller may command the rotational driving part to set a rotation direction to follow a sequence of clockwise direction-stop-counterclockwise direction according to a predetermined time, thereby changing the rotation direction of the rotary table according to the corresponding time.

[0073] In addition, the remixing part may further include an angle adjustment part 350 at the lower end of the rotary table such that the rotary table has an angle of 5° to 20° with respect to a ground surface about a rotation axis.

[0074] The angle adjustment part is provided separately from the rotary table and is intended to lift an end of the rotary table such that the container and the material in the container are tilted at a predetermined angle with respect to the ground surface. To this end, the angle adjustment part may be connected to the driving part as shown in FIG. 4, but is not limited thereto.

[0075] Specifically, the angle adjustment part 350 includes one pair of arms connected via a joint that are connected to an upper portion of the driving part such that the driving part is tilted in directions indicated by arrows in FIGS. 4 and 5. Accordingly, since the rotary table connected to the driving part is also tilted together, the inclination is naturally transmitted to the material in the container, thereby enhancing agitation and defoaming effects.

[0076] When the angle adjustment part is provided as described above, agitation and defoaming effects of the material in the container may be further enhanced. When the angle between the ground surface and the rotary table is less than the range, agitation and defoaming effects are insufficient. When the angle between the ground surface and the rotary table exceeds the range, a contact area between the material and the container increases, which may cause deterioration of the material due to heat generation.

[0077] A non-contact liquid heat dissipation material remixing device and a liquid heat dissipation material remixing method using the same according to the present disclosure can suppress phase separation of the heat dissipation material through a remixing process of the liquid heat dissipation material while simultaneously controlling a process condition, thereby optimizing the remixing process. In particular, a rotation time and a rotation direction of the heat dissipation material and the inclination of the container containing the material are adjusted, thereby enhancing mixability between a polymer resin and thermally conductive particles and improving heat dissipation characteristics.

[0078] Hereinafter, the present disclosure will be described in more detail with referenece to examples and comparative examples. However, the following examples are merely examples for describing the present disclosure in detail, and do not limit the present disclosure.

[0079] Specifications of a sample used in examples and a method of measuring physical properties of a specimen are as follows.(Sample)

[0080] The used sample was a mixture of silicone oil and alumina powder at a weight ratio of 1:1.(Remixing)

[0081] After fixing the container containing the sample on the rotary table, the vacuum part was lowered to completely cover the container. Then, the material was remixed by adjusting the holding time of the rotation direction, the inclination degree of the container, the rotational speed, and the vacuum time as shown in the table below. Thereafter, the material before and after remixing was visually inspected.(Examples 1 to 10 and Comparative examples 1 to 16)

[0082] In order to examine a degree of remixing of the material according to the holding time of the rotation direction, other conditions were fixed except for a vacuum holding time, and the holding time of the rotation direction was adjusted to 1 second, 3 seconds, 5 seconds, 10 seconds, 30 seconds, 60 seconds, and 180 seconds as shown in Tables 1 and 4. Thereafter, the material state before and after remixing was visually inspected. [Table 1]inclination angle (° )rotational speed (m)rotation holding time (sec)vacuum holding time (min)total remixing time (min)holding timestop timeholding timestop timeexample 154950example 22930example 31920example 43910example 51532129130example 62425example 71920example 812930example 92425example 101920|Rule 91, 20.06.2025 |Rule 91, 20.06.2025 |Rule 91, 20.06.2025 |Rule 91, 20.06.2025 [Table 4] inclination angle (° )ratational speed ()rotation holding time (sec)vacuum holding time (min)total remixing time (min)holding timestop timeholding timestop timecomparative exmple 11804950comparative example 22930comparative example 31920comparative example 4910comparative example 5604950comparative example 62930comparative example 71920comparative example 81532910comparative example 9304950camparative example 102930comparative example 111920comparative example 12910comparative example 13104950comparative example 142930comparative example 151920comparative example 16910 |Rule 91, 20.06.2025 |Rule 91, 20.06.2025 |Rule 91, 20.06.2025 |Rule 91, 20.06.2025 |Rule 91, 20.06.2025 |Rule 91, 20.06.2025 |Rule 91, 20.06.2025 |Rule 91, 20.06.2025

[0083] As shown in FIGS. 6 to 11, it can be seen that examples in which the rotation holding time fell within the range of the present disclosure exhibited superior remixing effects, since almost no bubbles were generated, compared to comparative examples in which the rotation holding time did not fall within the range of the present disclosure. |Rule 91, 20.06.2025 (Examples 11 to 14)

[0084] In order to examine a degree of remixing of the material according to the inclination degree of the container, the rotation holding time was fixed, while the rotational speed was to 35 rpm and 40 rpm, the inclination angle of the container was set to 15° and 10°, and the vacuum holding time was set to 19 minutes and 14 minutes as shown in Table 9. Thereafter, the material state before and after remixing was visually inspected. [Table 9]inclination angle (° )rotational speed (rpm)rotation holding time (sec)vacuum holding time (min)total remixing time (min)holding timestop timeholding timestop timeexample 1115351920example 123114115example 1310401920example 141415|Rule 91, 20.06.2025 |Rule 91, 20.06.2025

[0085] As shown in FIG. 12, in Examples 11 and 12 in which the inclination, the rotational speed, and the vacuum time were set to 15°, 35 rpm, and a predetermined time and Examples 13 and 14 in which the inclination, the rotational speed, and the vacuum time were set to 10°, 40 rpm, and a predetermined time, a phenomenon in which the material collided with the container did not occur. However, Examples 11 and 12 exhibited better remixing effects than Examples 13 and 14. |Rule 91, 20.06.2025 (FIGS. 15 to 18) |Rule 91, 20.06.2025

[0086] In order to examine a degree of remixing of the material according to the rotational speed and the rotation holding time of the container, the rotational speed was adjusted to 35 rpm and 37 rpm, and the rotation holding time was adjusted to 3 seconds and 2 seconds as shown in Table 11. Thereafter, the material state before and after remixing was visually inspected. [Table 11]inclination angle (° )rotational speed (rpm)rotation holding time (sec)vacuum holding time (min)total remixing time (min)holding timestop timeholding timestop timeexample 1115323119120example 1235example 132example 1437|Rule 91, 20.06.2025 |Rule 91, 20.06.2025

[0087] As shown in FIG. 13, it can be seen that Example 18 in which the inclination of 15° and the rotational speed of 37 rpm were maintained with the rotation holding time of 2 seconds and the total vacuum holding time of 20 minutes exhibited the most superior remixing effects. |Rule 91, 20.06.2025

[0088] Although exemplary embodiments of the present disclosure have been described, it will be apparent that the present disclosure may employ various various modifications, changes, and equivalents and the embodiments may be appropriately modified and applied in the same manner. Accordingly, the foregoing description is not intended to limit the scope of the present disclosure, which is defined by the appended claims.

Claims

1. A liquid heat dissipation material remixing method, comprising: a) preliminarily agitating material through pumping; b) filtering the preliminarily agitated material; and c) supplying the filtered material to an agitator provided with a rotating member rotating therein and a vacuum device, and performing continuous agitation and defoaming processing while changing a rotation direction at predetermined time intervals.

2. The liquid heat dissipation material remixing method of claim 1, wherein the rotating member has a holding time of the rotation direction of 1 second to 5 seconds.

3. The liquid heat dissipation material remixing method of claim 1, wherein the rotating member has a rotational speed of 20 rpm to 40 rpm.

4. The liquid heat dissipation material remixing method of claim 1, wherein the vacuum device is operated for 10 minutes to 30 minutes.

5. The liquid heat dissipation material remixing method of claim 1, wherein the vacuum device has a vacuum pressure of 0.04 torr to 40 torr.

6. A non-contact liquid heat dissipation material remixing device, comprising: a squeezing part configured to remove packaging of a container; a preliminary agitating pumping part configured to pump material in the container to perform preliminary agitation; and a remixing part configured to perform defoaming of the material by rotating the container and creating a vacuum inside the container.

7. The non-contact liquid heat dissipation material remixing device of claim 6, wherein the remixing part comprises: a rotary table configured to support the container containing the material so that the container is rotated freely; a rotational driving part configured to rotate the rotary table in a clockwise direction or a counterclockwise direction; a vacuum part connected to an opening of the container and configured to create a vaccum inside the container and induce defoaming of the material; and a controller configured to control a rotational speed, a rotation direction, and a rotation application time of the rotational driving part, and a vacuum pressure and a pressure application time of the vacuum part.

8. The non-contact liquid heat dissipation material remixing device of claim 7, wherein the remixing part further comprises: an angle adjustment part at a lower end of the rotary table such that the rotary table has an angle of 5° to 20° with respect to a ground surface about a rotation axis.

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