CN116618275A - Composite foam copper liquid absorption core, preparation method and application thereof - Google Patents

Composite foam copper liquid absorption core, preparation method and application thereof Download PDF

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Publication number
CN116618275A
CN116618275A CN202310676683.1A CN202310676683A CN116618275A CN 116618275 A CN116618275 A CN 116618275A CN 202310676683 A CN202310676683 A CN 202310676683A CN 116618275 A CN116618275 A CN 116618275A
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China
Prior art keywords
copper
composite
foam
composite foam
liquid
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CN202310676683.1A
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Chinese (zh)
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CN116618275B (en
Inventor
殷祚炷
刘凯元
薛名山
李欢
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Nanchang Hangkong University
Yangzhou Hy Technology Development Co Ltd
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Nanchang Hangkong University
Yangzhou Hy Technology Development Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/007—After-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/10—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by other chemical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/04—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain a surface receptive to ink or other liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • B05D7/544—No clear coat specified the first layer is let to dry at least partially before applying the second layer
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D101/00—Coating compositions based on cellulose, modified cellulose, or cellulose derivatives
    • C09D101/08—Cellulose derivatives
    • C09D101/16—Esters of inorganic acids
    • C09D101/18—Cellulose nitrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/63—Additives non-macromolecular organic
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2503/00—Polyurethanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2504/00—Epoxy polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/08—Metals
    • C08K2003/085—Copper

Abstract

The invention discloses a composite foam copper liquid suction core, a preparation method and application thereof, wherein the preparation method comprises the following steps: adding copper powder, melamine and an adhesive into an organic solvent for mixing to obtain a mixed coating; uniformly attaching the mixed coating to the surface of the foam copper, and then drying to obtain the composite foam copper; sintering the composite foam copper and the soaking plate to obtain a composite sintering sample; and attaching a cellulose solution to the composite sintering sample to obtain the composite foam copper liquid absorption core. According to the invention, the copper foam and the mixed coating are sintered on the soaking plate, and then the cellulose solution is coated to form two layers of protective layers, so that the copper foam is prevented from being exposed to the atmospheric environment and is rapidly oxidized, and the liquid permeation speed is improved. The cellulose layer on the surface of the composite foam copper liquid absorption core also has water absorption performance, and can further enhance the liquid permeation effect of the liquid absorption core, thereby enhancing the liquid flow speed of the liquid absorption core.

Description

Composite foam copper liquid absorption core, preparation method and application thereof
Technical Field
The invention relates to a liquid suction core, in particular to a composite foam copper liquid suction core, a preparation method and application thereof.
Background
The electronic component generates a large amount of heat during operation, for example, the heat flux density of the computer CPU during operation reaches 60-100W/cm 2 Even up to 103W/cm in semiconductor lasers 2 . With the rapid development of precision electronic components, the application of vapor chamber with flexibility, high heat dissipation effect and other aspects is becoming more and more important. Vapor chamber is widely used as a heat transfer device for electronic products, and the core structure inside the vapor chamber is a liquid suction core.
The liquid absorption core contains rich capillary structure and plays an important role in heat transfer effect. As a core part of heat dissipation of the vapor chamber, research on the vapor chamber is getting more and more important. Copper liquid absorption cores are valued for the easy availability of raw materials and good heat conduction effect. At present, the liquid suction core is mainly prepared by adopting a copper powder sintering, pipe wall slotting and copper mesh attaching method. The three types of liquid suction cores are directly contacted with copper on the surface and air, and are easy to oxidize in the use process, so that pores are extruded, and the liquid suction cores cannot work normally. In order to prevent oxidation, high-temperature hydrogen is needed to be used for reduction before vacuumizing and water injection, oxide skin on the surface of copper is removed, and the capillary capacity of the liquid suction core can be ensured, so that qualified heat pipes and hot plates are obtained. The high temperature of 900 ℃ is needed for reducing the copper surface by using high temperature hydrogen, the time is long, and the production efficiency is low.
Disclosure of Invention
Aiming at the problem that the copper liquid absorption core is easy to oxidize, the invention provides a composite foam copper liquid absorption core, a preparation method and application thereof, wherein the method is to add a protective coating on the surface of the foam copper liquid absorption core to protect porous foam copper from being oxidized, and to improve the liquid permeation speed,
in order to achieve the above object, according to one aspect of the present invention, there is provided a method for preparing a composite copper foam wick, comprising the steps of:
s1, adding copper powder, melamine and an adhesive into an organic solvent for mixing to obtain a mixed coating;
s2, uniformly attaching the mixed coating to the surface of the foam copper, and then drying to obtain the composite foam copper;
s3, sintering the composite foam copper and the soaking plate to obtain a composite sintering sample;
in the sintering process, melamine is decomposed to generate holes, and a copper powder layer formed by mixing the paint forms a structure with porosity slightly lower than that of porous foam copper, so that the hydrophilic and liquid flowing effects are enhanced.
And S4, attaching a cellulose solution to the composite sintering sample to obtain the composite foam copper liquid absorption core.
Layering the mixed paint layer and cellulose layer prevents the penetration of the surface first layer cellulose that could fill the porous copper foam, resulting in a loss of capillary properties.
According to the invention, the copper foam and the mixed coating are sintered on the soaking plate, and then the cellulose solution is coated to form two protective layers, so that the copper foam is prevented from being exposed to the rapid oxidation in the atmospheric environment. The composite foam copper liquid suction core prepared by the invention has the performances of super hydrophilicity, rapid liquid permeation and the like, and can be used for the liquid suction core of a vapor chamber. In addition, the cellulose layer on the surface of the composite foam copper liquid suction core also has water absorption performance, and can further enhance the liquid permeation effect of the liquid suction core, thereby enhancing the liquid flow speed of the liquid suction core.
Preferably, in step S1, the mass ratio of the copper powder to the melamine is (9-15): 1, a step of; and/or
The mass ratio of the copper powder to the organic solvent is (3-6): 1.
in the invention, if the copper powder concentration is too low, a better micropore net structure cannot be formed; the copper powder structure produced by the high concentration cannot form microscopic holes, and finally cannot enable liquid to flow rapidly. The proper proportion can enable the coating uniformity of the foam copper liquid absorption core to be good, the microstructure space is proper, on one hand, the coating can be firmly combined with the nitrocellulose layer, and on the other hand, the porous foam copper on the lower layer can be effectively protected, so that the working medium can flow rapidly.
The organic solvent is one or more of ethyl acetate, ethanol, methyl acetate and acetone.
Preferably, in step S1, the adhesive is polyurethane or epoxy resin; and/or the mass ratio of the copper powder to the adhesive is (9-18): 1.
preferably, in step S2, the coating is uniformly adhered to the surface of the copper foam by adopting a spraying method, and the preparation process is simple, convenient and low in cost.
It is further preferred that the sprayed thickness be one to two layers, with a small thickness and no cracking of the coating after air drying, but be full and uniform.
Preferably, in step S2, the drying process is: drying at 20-30 ℃ for 3-4 hours or drying at 60-90 ℃ for 1-2 hours.
In the technical scheme, the mixed coating layer can be properly cured under two drying conditions, so that the super-hydrophilic performance and the liquid permeability of the foam copper liquid absorption core are ensured.
Preferably, in step S3, the sintering process is: and preserving heat for 1-2 hours at 950-1000 ℃.
Preferably, in step S4, the cellulose is nitrocellulose or cellulose acetate; and/or
The cellulose solution comprises the following components in percentage by mass (0.05-0.2): 1 and an organic solvent.
Preferably, the cellulose solution is attached to the composite sinter sample using a coating process.
The high flatness and flexibility of the cellulose coating enable the coating prepared by the coating method to be distributed more uniformly. In addition, the cellulose film is soft, so that the liquid absorption core has the same flexibility as the base material and is more flexible to use.
In a second aspect, the invention provides a composite copper foam wick made by the above-described method of manufacture.
The third aspect of the invention provides an application of the composite foam copper liquid absorption core in preparing a heat dissipation element.
Through the technical scheme, the invention has the following beneficial effects:
1. according to the invention, the copper foam and the mixed coating are sintered on the soaking plate, and then the cellulose solution is coated to form two layers of protective layers, so that the copper foam is prevented from being exposed to the atmospheric environment and is rapidly oxidized, and the liquid permeation speed is improved. The cellulose layer on the surface of the composite foam copper liquid absorption core also has water absorption performance, and can further enhance the liquid permeation effect of the liquid absorption core, thereby enhancing the liquid flow speed of the liquid absorption core.
2. The preparation method has the advantages of simple and convenient preparation process, low cost, small influence on environment, low requirement on reaction equipment, mass production and capability of changing the coating according to the requirement so as to endow the composite foam copper liquid absorption core with more performances.
Drawings
Fig. 1 is a schematic view of the microstructure of a copper composite foam wick prepared in example 2 of the present invention;
fig. 2 is a graph of superhydrophilic performance testing of a composite copper foam wick of the invention;
fig. 3 is a side-stream performance test chart of a copper composite foam wick of the present invention.
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to examples. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
The components used in the examples are shown in the following table.
Table 1 Components (g) of the examples
The preparation method comprises the following steps:
s1, ultrasonically mixing copper powder, an organic solvent and an adhesive for 45min to obtain a mixed coating;
s2, pouring the paint into a spray gun, spraying one surface to two layers of the copper foam substrate in a fume hood, taking out the copper foam substrate after the spraying is finished, and drying the copper foam substrate in an oven at 40 ℃ for 2 hours to obtain the composite copper foam liquid absorption core.
And S3, putting the composite foam copper obtained in the step S2 into a tube furnace, introducing nitrogen, sintering at 1000 ℃, and taking out the composite foam copper after sintering is completed.
S4, dissolving cellulose in an organic solvent, coating the obtained solution on the surface of the foam copper liquid suction core, and drying at room temperature to obtain the composite foam copper liquid suction core.
As shown in fig. 1, the SEM image of the thin film coating of example 2 shows that the surface of the liquid suction core is a nitrocellulose membrane layer, and the coating has a better protection effect.
Other conditions the effect of different copper powder contents on super-hydrophilic properties, liquid flow properties were tested as in example 2.
The super-hydrophilic properties of each wick sample were tested using a DSA100 contact angle meter and the results are shown in fig. 2. As can be seen from fig. 2, the composite foam copper liquid-absorbing core has super-hydrophilic performance when the copper powder content defined by the invention is used, which indicates that the liquid-absorbing core has better hydrophilic performance, and cannot obtain good hydrophilic effect when the copper powder content is too low or too high.
Lateral flow performance testing was performed using a 40mm long copper composite foam wick, the results of which are shown in figure 3. As can be seen from the figure, the side-flow chromatographic effect of the composite copper foam wick was somewhat increased compared to the original copper foam wick.
From the above description, it can be seen that the present invention has the following advantages: the preparation method has the advantages of being simple and convenient in preparation process, low in cost, small in environmental impact and low in requirements on reaction equipment, and meeting market demands.
The preferred embodiments of the present invention have been described in detail above with reference to the examples, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solutions of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.

Claims (10)

1. The preparation method of the composite foam copper liquid suction core is characterized by comprising the following steps of:
s1, adding copper powder, melamine and an adhesive into an organic solvent for mixing to obtain a mixed coating;
s2, uniformly attaching the mixed coating to the surface of the foam copper, and then drying to obtain the composite foam copper;
s3, sintering the composite foam copper and the soaking plate to obtain a composite sintering sample;
and S4, attaching a cellulose solution to the composite sintering sample to obtain the composite foam copper liquid absorption core.
2. The preparation method of the composite foam copper liquid suction core according to claim 1, wherein in the step S1, the mass ratio of the copper powder to the melamine is (9-15): 1, a step of; and/or
The mass ratio of the copper powder to the organic solvent is (3-6): 1.
3. the method for preparing a composite foam copper liquid absorption core according to claim 1, wherein in the step S1, the adhesive is polyurethane or epoxy resin; and/or
The mass ratio of the copper powder to the adhesive is (9-18): 1.
4. the method for preparing a composite copper foam wick according to claim 1, wherein in step S2, a coating is uniformly adhered to the surface of the copper foam by a spraying method.
5. The method for preparing a composite copper foam wick according to claim 1, wherein in step S2, the drying process is: drying at 20-30 ℃ for 3-4 hours or drying at 60-90 ℃ for 1-2 hours.
6. The method for preparing a composite copper foam wick according to claim 1, wherein in step S3, the sintering process is: and preserving heat for 1-2 hours at 950-1000 ℃.
7. The method of producing a copper composite foam wick according to any one of claims 1 to 6, characterized in that in step S4, the cellulose is nitrocellulose or cellulose acetate; and/or
The cellulose solution comprises the following components in percentage by mass (0.05-0.2): 1 and an organic solvent.
8. A method of preparing a copper composite foam wick according to any one of claims 1 to 6, characterized in that in step S4, the cellulose solution is attached to the composite sinter sample by a coating method.
9. A composite copper foam wick made by the method of any one of claims 1 to 8.
10. Use of a copper composite foam wick according to claim 9 for the preparation of a heat dissipating component.
CN202310676683.1A 2023-06-08 2023-06-08 Composite foam copper liquid absorption core, preparation method and application thereof Active CN116618275B (en)

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