Hydrophilic modification process of liquid absorption core
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- UNITED WINNERS LASER CO LTD
- Filing Date
- 2026-05-08
- Publication Date
- 2026-06-30
AI Technical Summary
Existing wicks have smooth surfaces and simple pores, resulting in weak capillary force and low liquid climbing height, leading to slow reflux. Furthermore, they are prone to drying out at the hot end and accumulating liquid at the cold end in high-power heat dissipation scenarios.
A laser beam is used to form an interlaced mesh scanning path on the surface of the liquid-absorbing core. Combined with laser oxidation treatment, nanoscale micro-textures and hydrophilic groups are formed, which improves surface roughness and capillary climbing ability.
It improves the liquid rise height and speed of the suction core, avoids local drying, enhances the overall liquid return capacity of the suction core, and reduces deformation.
Smart Images
Figure CN122303566A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of liquid absorbent core processing technology, and in particular to a process for hydrophilic modification of liquid absorbent cores. Background Technology
[0002] As the core component of a vapor chamber, the wick allows condensed liquid to flow back to the heating zone through capillary action, maintaining the evaporation-condensation cycle. Currently, it has the following drawbacks: 1. The woven copper mesh wick has a smooth surface and simple pore structure, resulting in weak capillary force, low liquid rise height, and slow return flow. 2. In high-power heat dissipation scenarios, it is prone to drying out at the hot end and accumulating liquid at the cold end. Summary of the Invention
[0003] In view of the shortcomings of the prior art, the purpose of this invention is to provide a hydrophilic modification process for the liquid absorbent core, which can effectively improve the liquid climbing ability of the liquid absorbent core and reduce the deformation of the liquid absorbent core in the liquid climbing direction during the modification process.
[0004] The embodiments of the present invention are achieved through the following technical solutions: A process for hydrophilic modification of a liquid-absorbing core includes the following steps: Clean the suction cartridge; Fix the liquid suction core so that it is within the processing area of the laser beam; The laser beam projects a spot onto the surface of the liquid-absorbing core and scans along a first direction and a second direction to form several equally spaced first paths and several equally spaced second paths. The first paths and the second paths intersect to form an interlaced mesh scanning path on the surface of the liquid-absorbing core. The first direction is parallel to the direction of liquid climbing of the liquid-absorbing core, and the angle between the second direction and the first direction is α, where 0° < α < 90°.
[0005] According to a preferred embodiment, the laser beam is an ultraviolet nanosecond laser.
[0006] According to a preferred embodiment, the laser beam has a wavelength of 355 nm, a pulse width of 1-50 ns, and a repetition frequency of 40-80 kHz.
[0007] According to a preferred embodiment, the scanning speed of the laser beam is 500-1000 mm / s, the fill spacing is 0.03-0.06 mm, and the power is 3-30 W.
[0008] According to a preferred embodiment, the scanning speed of the laser beam is 600-800 mm / s, the fill spacing is 0.04-0.05 mm, and the power is 20-25 W.
[0009] According to a preferred embodiment, the cleaning of the liquid-absorbing core includes the following steps: The suction core was ultrasonically cleaned with ethanol. Rinse the absorbent core with deionized water; The washing solution core was dried under a nitrogen atmosphere.
[0010] According to a preferred embodiment, after fixing the liquid suction core so that it is within the processing area of the laser beam, the method further includes the following steps: Cover the surface of the liquid absorption core with a glass plate.
[0011] According to a preferred embodiment, before fixing the liquid suction core so that it is within the processing area of the laser beam, the method further includes the following steps: The liquid suction core is flattened and calendered.
[0012] According to a preferred embodiment, fixing the liquid suction core so that it is within the processing area of the laser beam includes: Set up a negative pressure adsorption plate and make the negative pressure adsorption plate in an adsorption state; One end of the liquid absorption core along its length is attached to the negative pressure adsorption plate, and the other end of the liquid absorption core along its length is driven to gradually move toward the negative pressure adsorption plate and simultaneously move along the length of the liquid absorption core until the liquid absorption core is completely attached to the negative pressure adsorption plate.
[0013] According to a preferred embodiment, the negative pressure adsorption plate is equipped with a consumable plate, and the processing area of the laser beam on the liquid absorption core is located within the consumable plate area. The consumable plate is a copper plate or a stainless steel plate.
[0014] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects: The modification process of this invention can increase the surface roughness of the liquid absorber to 0.6–1.5 μm, forming a micro-texture suitable for capillary climb. Furthermore, the laser beam induces oxidation on the surface of the liquid absorber, producing hydrophilic groups and reducing the contact angle to less than or equal to 5°, achieving superhydrophilicity. This effectively improves the liquid climb height and speed of the liquid absorber. By performing staggered mesh scanning on the surface of the liquid absorber, the consistency of the surface modification can be ensured, avoiding localized drying. Moreover, the first direction is parallel to the liquid climb direction of the liquid absorber, and the angle between the second direction and the first direction is α, where 0° < α < 90°. This forms a groove structure on the surface of the liquid absorber that facilitates liquid climb. Specifically, the extension direction of this groove structure is the same as or tends to be the same as the liquid climb direction of the liquid absorber, which helps to increase the overall liquid climb speed of the liquid absorber and reduce the deformation of the liquid absorber in the first direction, i.e., the liquid climb direction of the liquid absorber. Attached Figure Description
[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the process for hydrophilic modification of the absorbent core provided in an embodiment of the present invention; Figure 2 This is a diagram of the interlaced mesh scanning path on the suction core provided in an embodiment of the present invention; Figure 3 A schematic diagram of the assembly structure of the negative pressure adsorption plate, consumable plate, liquid absorption core and glass plate provided in the embodiments of the present invention; Figure 4 This is a schematic diagram of the first state of the liquid-absorbing core being laid flat on the adsorption plate according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the second state of the liquid-absorbing core laid flat on the adsorption plate according to an embodiment of the present invention; Figure 6 This is a surface structure diagram of the modified liquid-absorbing core provided in an embodiment of the present invention; Figure 7 This is an image showing the effect of laser beam processing of the liquid-absorbing core after the surface of the liquid-absorbing core is covered with a glass plate, as provided in an embodiment of the present invention. Icons: 1-Liquid suction core, 11-First path, 12-Second path, 2-Negative pressure adsorption plate, 3-Consumable plate, 4-Glass plate, 5-Laser beam, X-First direction, Y-Second direction. Detailed Implementation
[0017] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.
[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
[0019] Please refer to Figures 1 to 7 A hydrophilic modification process for a liquid-absorbing core 1 includes the following steps: Step S1: Clean the liquid suction core 1; Step S2: Fix the liquid suction core 1 so that the liquid suction core 1 is within the processing area of the laser beam 5; Step S3: The laser beam 5 projects a spot onto the surface of the liquid-absorbing core 1 and scans along the first direction X and the second direction Y, forming several equally spaced first paths 11 and several equally spaced second paths 12. The first paths 11 and the second paths 12 intersect to form an interlaced mesh scanning path on the surface of the liquid-absorbing core 1. The first direction X is parallel to the liquid climbing direction of the liquid-absorbing core 1, and the angle between the second direction Y and the first direction X is α, where 0° < α < 90°. In this embodiment, the liquid-absorbing core 1 is cleaned to remove oil and impurities from its surface. The liquid-absorbing core 1 is fixed to prevent it from shifting position during processing. Laser-assisted non-etching, low-thermal-affected zone modification of the wick 1 surface is achieved. Specifically, laser irradiation of the wick 1 induces the formation of nanoscale micro-protrusions and microscopic rough textures on its surface, increasing the specific surface area and enhancing capillary driving force. Simultaneously, under the action of the laser beam 5, hydrophilic oxide groups are generated on the surface of the wick 1. For example, if the wick 1 is made of copper, a copper oxide surface layer is formed under the action of the laser beam 5. In this way, the surface roughness of the wick 1 can be increased to 0.6–1.5 μm, forming microscopic textures suitable for capillary climbing. Furthermore, the laser beam 5 induces oxidation on the surface of the wick 1, producing hydrophilic groups and reducing the contact angle to less than or equal to 5°, achieving superhydrophilicity. This effectively improves the liquid climbing height and speed of the wick 1. By performing staggered mesh scanning on the surface of the wick 1, the consistency of the surface modification can be ensured, avoiding localized drying. Furthermore, the first direction X is parallel to the liquid climbing direction of the absorbent core 1, and the angle between the second direction Y and the first direction X is α, where 0° < α < 90°. This can form a groove structure on the surface of the absorbent core 1 that is conducive to liquid climbing. Specifically, the extension direction of the groove structure is the same as or tends to be the same as the liquid climbing direction of the absorbent core 1, which is conducive to improving the overall liquid climbing speed of the absorbent core 1 and reducing the deformation of the absorbent core 1 in the first direction X, that is, in the liquid climbing direction of the absorbent core 1.
[0020] Preferably, α = 45° or α = 60°.
[0021] Preferably, the laser beam 5 is an ultraviolet nanosecond laser.
[0022] Optionally, the wavelength of the laser beam 5 is 355nm, the pulse width is 1-50ns, and the repetition frequency is 40-80kHz.
[0023] Optionally, the scanning speed of the laser beam 5 is 500-1000 mm / s, the filling gap is 0.03-0.06 mm, and the power is 3-30 W.
[0024] Furthermore, the scanning speed of the laser beam 5 is 600-800 mm / s, the filling gap is 0.04-0.05 mm, and the power is 20-25 W.
[0025] In this embodiment, step S1 includes the following steps: Step S11: Use ethanol to ultrasonically clean the liquid suction core 1; Step S12: Rinse the absorbent core 1 with deionized water; Step S13: Dry the washing solution core under a nitrogen atmosphere.
[0026] Through the above steps, oil and impurities on the surface of the liquid suction core 1 can be effectively removed, and the liquid suction core 1 can be dried without oxidation.
[0027] like Figure 3 and Figure 7 As shown, in this embodiment, after step S2 and before step S3, the following step is also included: Step S20: Cover the surface of the liquid-absorbing core 1 with a glass plate 4. Specifically, during processing, a glass plate 4 is covered on the upper side of the liquid-absorbing core 1. The laser beam 5 penetrates the glass plate 4 and acts on the liquid-absorbing core 1, while simultaneously acting on the glass plate 4. During this process, the glass plate 4 generates glass dust under the action of the laser beam 5. The glass dust adheres to the surface of the liquid-absorbing core 1, which can improve the surface roughness of the liquid-absorbing core 1. At the same time, the glass dust is silicon dioxide, which is hydrophilic, thereby improving the liquid climbing ability of the liquid-absorbing core 1.
[0028] In this embodiment, before step S2, the following step is included: flattening and rolling the liquid-absorbing core 1. Specifically, the liquid-absorbing core 1 is a woven metal wire mesh, made of copper wire or stainless steel wire, etc. Because the metal wires have arches or depressions during the weaving process, and the metal wires are cylindrical, the area available for processing by the laser beam 5 on a single metal wire is limited during laser beam processing. By flattening and rolling the liquid-absorbing core 1, the area available for processing by the laser beam 5 on a single metal wire is increased, meaning that more groove structures that are beneficial to improving capillary climbing effects can be processed on a single metal wire. It should be noted that the flattening and rolling process on the liquid-absorbing core 1 can be performed before step S1 or between step S1 and step S2.
[0029] In this embodiment, step S2 includes: Step S21: Set up the negative pressure adsorption plate 2 and make the negative pressure adsorption plate 2 in an adsorption state; Step S22: Attach one end of the liquid absorption core 1 along its length to the negative pressure adsorption plate 2, and drive the other end of the liquid absorption core 1 along its length to gradually move toward the negative pressure adsorption plate 2 and simultaneously move along the length of the liquid absorption core 1 until the liquid absorption core 1 is completely attached to the negative pressure adsorption plate 2.
[0030] like Figure 4 and Figure 5 As shown, due to the small thickness and flexibility of the liquid absorption core 1, according to the above steps, the liquid absorption core 1 can be laid flat on the surface of the negative pressure adsorption plate 2, which effectively avoids wrinkles in the liquid absorption core 1 and is beneficial to subsequent processing.
[0031] In some embodiments, a consumable plate 3 is mounted on the negative pressure adsorption plate 2, and the processing area of the laser beam 5 on the absorbent core 1 is located within the area of the consumable plate 3. The consumable plate 3 is a copper plate or a stainless steel plate. In this embodiment, a consumable groove is provided on the surface of the negative pressure adsorption plate 2, and the consumable plate 3 is mounted in the consumable groove so that the absorbent core 1 can be laid flat on the negative pressure adsorption plate 2. Thus, during the laser beam 5 processing of the absorbent core 1, the consumable plate 3 generates splashes under the action of the laser beam 5 and adheres to the back surface of the absorbent core 1, thereby helping to provide hydrophilicity to the back side of the absorbent core 1. For example, when the absorbent core 1 is a copper mesh, the consumable plate 3 is a copper plate; when the absorbent core 1 is a stainless steel mesh, the consumable plate 3 is a stainless steel plate.
[0032] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.
Claims
1. A process for hydrophilic modification of a liquid-absorbing core, characterized in that, Includes the following steps: Clean the suction cartridge; Fix the liquid suction core so that it is within the processing area of the laser beam; The laser beam projects a spot onto the surface of the liquid-absorbing core and scans along a first direction and a second direction to form several equally spaced first paths and several equally spaced second paths. The first paths and the second paths intersect to form an interlaced mesh scanning path on the surface of the liquid-absorbing core. The first direction is parallel to the direction of liquid climbing of the liquid-absorbing core, and the angle between the second direction and the first direction is α, where 0° < α < 90°.
2. The hydrophilic modification process for the absorbent core according to claim 1, characterized in that, The laser beam is an ultraviolet nanosecond laser.
3. The hydrophilic modification process for the absorbent core according to claim 2, characterized in that, The laser beam has a wavelength of 355nm, a pulse width of 1-50ns, and a repetition frequency of 40-80kHz.
4. The hydrophilic modification process for the absorbent core according to claim 3, characterized in that, The laser beam has a scanning speed of 500-1000 mm / s, a fill spacing of 0.03-0.06 mm, and a power of 3-30 W.
5. The hydrophilic modification process for the absorbent core according to claim 4, characterized in that, The laser beam has a scanning speed of 600-800 mm / s, a fill spacing of 0.04-0.05 mm, and a power of 20-25 W.
6. The hydrophilic modification process for the absorbent core according to claim 1, characterized in that, The cleaning of the liquid suction core includes the following steps: The suction core was ultrasonically cleaned with ethanol. Rinse the absorbent core with deionized water; The washing solution core was dried under a nitrogen atmosphere.
7. The hydrophilic modification process for the absorbent core according to claim 1, characterized in that, After fixing the liquid suction core so that it is within the processing area of the laser beam, the process further includes the following steps: Cover the surface of the absorbent core with a glass plate.
8. The hydrophilic modification process for the absorbent core according to claim 1, characterized in that, Before fixing the liquid suction core so that it is within the processing area of the laser beam, the method further includes the following steps: The liquid suction core is flattened and calendered.
9. The hydrophilic modification process for the absorbent core according to claim 1, characterized in that, The method of fixing the liquid suction core so that it is within the processing area of the laser beam includes: Set up a negative pressure adsorption plate and make the negative pressure adsorption plate in an adsorption state; One end of the liquid absorption core along its length is attached to the negative pressure adsorption plate, and the other end of the liquid absorption core along its length is driven to gradually move toward the negative pressure adsorption plate and simultaneously move along the length of the liquid absorption core until the liquid absorption core is completely attached to the negative pressure adsorption plate.
10. The hydrophilic modification process for the absorbent core according to claim 9, characterized in that, The negative pressure adsorption plate is equipped with a consumable plate, and the processing area of the laser beam on the liquid absorption core is located within the consumable plate area. The consumable plate is a copper plate or a stainless steel plate.