CN116651679A - Piezoelectric atomizing jet printing equipment and method for preparing hydrophilic coating - Google Patents
Piezoelectric atomizing jet printing equipment and method for preparing hydrophilic coating Download PDFInfo
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- CN116651679A CN116651679A CN202310624425.9A CN202310624425A CN116651679A CN 116651679 A CN116651679 A CN 116651679A CN 202310624425 A CN202310624425 A CN 202310624425A CN 116651679 A CN116651679 A CN 116651679A
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- polyvinyl alcohol
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- 238000000576 coating method Methods 0.000 title claims abstract description 56
- 239000011248 coating agent Substances 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000007639 printing Methods 0.000 title claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 238000005507 spraying Methods 0.000 claims abstract description 12
- 239000000017 hydrogel Substances 0.000 claims abstract description 9
- 239000007921 spray Substances 0.000 claims abstract description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 75
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 75
- 239000000758 substrate Substances 0.000 claims description 45
- 239000000463 material Substances 0.000 claims description 39
- 239000007864 aqueous solution Substances 0.000 claims description 37
- 238000000889 atomisation Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 230000002209 hydrophobic effect Effects 0.000 claims description 11
- 238000003860 storage Methods 0.000 claims description 8
- 239000008367 deionised water Substances 0.000 claims description 7
- 229910021641 deionized water Inorganic materials 0.000 claims description 7
- 238000011049 filling Methods 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 4
- 230000001052 transient effect Effects 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000004809 Teflon Substances 0.000 claims description 3
- 229920006362 Teflon® Polymers 0.000 claims description 3
- 230000005661 hydrophobic surface Effects 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000003760 magnetic stirring Methods 0.000 claims description 3
- -1 polydimethylsiloxane Polymers 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000000443 aerosol Substances 0.000 claims 1
- 229920000642 polymer Polymers 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 9
- 238000002360 preparation method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000002390 adhesive tape Substances 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 238000001424 field-emission electron microscopy Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 230000003075 superhydrophobic effect Effects 0.000 description 2
- 238000005411 Van der Waals force Methods 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
- B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
- B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
- B05B17/0607—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers
- B05B17/0638—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers spray being produced by discharging the liquid or other fluent material through a plate comprising a plurality of orifices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
- B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
- B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
- B05B17/0607—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers
- B05B17/0653—Details
-
- 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
- B05D3/02—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 baking
- B05D3/0254—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
- 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
- B05D2201/00—Polymeric substrate or laminate
- B05D2201/02—Polymeric substrate
-
- 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
- B05D2203/00—Other substrates
- B05D2203/30—Other inorganic substrates, e.g. ceramics, silicon
-
- 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
- B05D2518/00—Other type of polymers
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Special Spraying Apparatus (AREA)
Abstract
A piezoelectric atomizing spray printing device and a method for preparing a hydrophilic coating are provided, wherein a spray printing platform comprises an atomizing nozzle and a triaxial moving platform, a secondary atomizing structure is assembled in the atomizing nozzle, and PVA-based polymer solution is atomized for one time under the action of a first piezoelectric transducer and an amplitude transformer; further atomizing the atomized liquid drops under the action of the second piezoelectric transducer and the micropore network; the atomizing nozzle is arranged on the three-dimensional motion platform, so that the customizable shape of the coating is realized; and the heating platform is used for solidifying the sprayed hydrogel microdroplet to form a hydrophilic coating, and the forming of the coating with a certain thickness is realized through multiple spraying, so that the flexible control of the appearance parameters of the coating can be realized.
Description
Technical Field
The application relates to the field of hydrophilic coating preparation, in particular to a preparation method of a hydrophilic coating based on piezoelectric atomization spray printing.
Background
Coatings are key to the functional implementation of new materials. For example, the preparation of a hydrophilic oleophobic coating on the surface of a metal mesh can be used to achieve separation of an oil-water mixture; a layer of super-hydrophobic coating is prepared on the surface of the glass, so that the glass can achieve a self-cleaning effect; in low latitude areas, the surface is provided with the super-hydrophobic coating, so that the anti-icing property of the object can be improved. In the sensing field, the coating may be made into electronic skin to identify hand movements or to identify the shape of a touching object. Among them, the technology of hydrophobic coating treatment on the surface of hydrophilic materials has been developed to be mature, but hydrophilic treatment on hydrophobic materials has been studied.
Currently, single-layer or multi-layer two-dimensional coating materials are prepared by solution deposition, mechanical stripping, liquid phase stripping and chemical vapor deposition. The mechanical stripping method overcomes Van der Waals force between material layers by using the viscosity of the adhesive tape, and repeatedly strips by adhesive tape adhesion to obtain a coating structure, but the method cannot effectively control the thickness of the coating; the liquid phase stripping method utilizes ultrasonic oscillation to obtain suspension, and a single-layer coating is finally obtained through multi-step cleaning and centrifugation, the method has lower cost, but has the problem of uncontrollable size, and the selection range of a substrate is limited; chemical vapor deposition, which uses one or more vapor compounds to chemically react on a substrate to form a coating, can produce a coating of large size, but is costly and time consuming to prepare, and has limited substrate options; the solution deposition method prepares a coating of controllable thickness by spin coating on a wafer substrate at high speed, but for non-circular substrates this method does not guarantee coating uniformity at the corners. Thus, a further development of the process for preparing the coating is required.
The key point of the coating preparation is the homogenization coating and control of the solution, the piezoelectric atomization can rapidly atomize the water-soluble solution into micro-nano-level droplets based on the inverse piezoelectric effect of the piezoelectric transducer, and the method has great application potential in the aspects of realizing the atomization of the polymer solution with higher viscosity and the coating preparation.
Disclosure of Invention
In order to solve the defects, improve the preparation capacity of a hydrophilic hydrogel coating, the application provides a preparation method of the hydrogel coating based on atomization spray printing, which adopts an amplitude transformer structure, amplifies the vibration amplitude generated by a piezoelectric transducer through the amplitude transformer, and maximizes the vibration efficiency on the atomization surface of the amplitude transformer, concentrates ultrasonic energy and realizes atomization enhancement; the micro-pore net is used for secondary atomization of small liquid drops after primary atomization, so that atomization enhancement is realized; atomizing the high-viscosity hydrogel solution through a twice piezoelectric atomization process; and then the large-breadth coating is effectively prepared through a precise three-dimensional motion platform.
The object of the application is achieved in the following way:
the piezoelectric atomizing jet printing equipment comprises a base, wherein a supporting seat and a supporting arm are fixedly arranged on the base; be provided with first spout on the supporting seat, first spout sets up along the Y axle, slidable mounting has first slider on the first spout, and heating platform passes through leveling bolt and is connected with first slider, sets up the second spout on the support arm, the second spout sets up along the X axle, and the movable plate passes through second slider and second spout sliding connection, the surface that the second slider was kept away from to the movable plate is provided with the third spout, the third spout sets up along the Z axle, shower nozzle anchor clamps with third spout sliding connection, and the atomizer passes through cross bolt and hex nuts to be fixed the front end of shower nozzle anchor clamps.
Further, the atomizing nozzle comprises an upper shell, a lower shell, an amplitude transformer and a focusing nozzle, wherein the upper shell and the lower shell are fixedly connected through four M4 bolts, the amplitude transformer is sequentially provided with a cylindrical part, a flange part and a conical part from top to bottom, and a liquid supply channel is formed in the amplitude transformer; a cylindrical cavity is formed between the upper shell and the lower shell, a second piezoelectric transducer, a gasket, a micropore net and an amplitude transformer sleeve are sequentially arranged in the cavity from bottom to top, a conical cavity is formed in the amplitude transformer sleeve, a conical part of the amplitude transformer is matched with the conical cavity, a first piezoelectric transducer is arranged on the upper surface of a flange part of the amplitude transformer, and a cylindrical part of the amplitude transformer extends out of the upper shell; the focusing nozzle is disposed below the lower housing.
A method for preparing a hydrophilic coating based on piezoelectric atomizing jet printing equipment, which comprises the following steps:
A0. preparing a polyvinyl alcohol aqueous solution, and filling the prepared polyvinyl alcohol aqueous solution into a liquid storage bottle;
A1. performing transient hydrophilic treatment on the surface of the hydrophobic substrate material by using oxygen plasma;
A2. spraying a polyvinyl alcohol coating:
uniformly spraying a polyvinyl alcohol aqueous solution on the surface of a substrate material; curing the polyvinyl alcohol aqueous solution sprayed on the surface of the substrate by heating and drying;
A3. and (3) executing the step A2 for a plurality of times, and finally obtaining the hydrophilic polyvinyl alcohol coating with the expected thickness on the surface of the hydrophobic substrate material.
Further, the specific operation process of preparing the polyvinyl alcohol aqueous solution in the step A0 is as follows: adding polyvinyl alcohol powder and deionized water into a magnetic stirring water area pot according to a proportion, heating to 100 ℃, stirring for 2.5 hours by using a magnetic stirrer, enabling powdery polyvinyl alcohol to be rapidly dissolved, standing to enable the temperature to be reduced to normal temperature, and filling into a liquid storage bottle to obtain the required polyvinyl alcohol aqueous solution.
Further, the molecular weight of the polyvinyl alcohol is 63800-72600, but not limited to the molecular weight of the polyvinyl alcohol, the mass fraction is 1%, and the mass fraction is relative to the mass of deionized water, taking 100 g deionized water as an example, and 1 g polyvinyl alcohol is needed to be added.
Further, the specific operation steps of spraying the polyvinyl alcohol coating in the step A2 are as follows:
a21: the heating platform is controlled by the controller to move to a proper position, and the substrate material processed in the step A1 is placed on the heating platform; setting the temperature of a heating platform to 90 ℃;
a22: a teflon hose was used to connect the reservoir to the inlet of the supply channel 10; the controller controls the atomizing nozzle to move along the X axis and the Z axis until the atomizing nozzle moves to the upper surface of the substrate material;
a23, starting a heating platform switch, and waiting for the heating platform to be heated to 90 ℃; an alternating current power supply is started, sinusoidal alternating current voltage is supplied to the first piezoelectric transducer and the second piezoelectric transducer, vibration is transmitted to the amplitude transformer after the first piezoelectric transducer is electrified, and vibration is transmitted to the microporous net after the second piezoelectric transducer is electrified;
a23, starting an injection pump, and continuously pumping a polyvinyl alcohol aqueous solution into the liquid supply channel; then the polyvinyl alcohol aqueous solution is pressed into the cavity of the amplitude transformer, and the amplitude transformer vibrates to atomize the polyvinyl alcohol aqueous solution for the first time; the polyvinyl alcohol aqueous solution after the first atomization passes through a microporous net and is atomized by the vibration of the microporous net for the second time; the atomized micro-droplets after secondary atomization are sprayed out through a conical focusing nozzle and are attached to a substrate material;
a24: the heating platform is controlled by the controller to move along the Y axis, and the atomizing nozzle is controlled to move along the X axis, so that the atomizing nozzle can repeatedly move along the surface of the substrate material, and the whole surface of the substrate material is uniformly covered with polyvinyl alcohol micro-droplets;
a25: and after the polyvinyl alcohol micro-droplets on the surface of the substrate material are completely dried and solidified, closing the heating platform to prepare the solidified hydrophilic polyvinyl alcohol hydrogel coating.
The substrate material is silicon wafer with hydrophobic surface or polydimethylsiloxane.
Compared with the prior art, the application has the following technical effects:
1. firstly, preparing a polyvinyl alcohol aqueous solution, and filling the prepared polyvinyl alcohol aqueous solution into a liquid storage bottle; performing transient hydrophilic treatment on the surface of the hydrophobic substrate material by using oxygen plasma; uniformly spraying a polyvinyl alcohol aqueous solution on the surface of a substrate material; curing the polyvinyl alcohol aqueous solution sprayed on the surface of the substrate by heating and drying; finally, the hydrophilic polyvinyl alcohol coating with the expected thickness is obtained on the surface of the hydrophobic substrate material. The method can effectively realize hydrophilic modification of the surface of the hydrophobic material;
2. because the prepared polyvinyl alcohol aqueous solution has larger viscosity, the horn sleeve, the micropore net, the first piezoelectric transducer and the second piezoelectric transducer are arranged in the atomizing nozzle, the first piezoelectric transducer transmits vibration to the horn after being electrified, the second piezoelectric transducer transmits vibration to the micropore net after being electrified, and the high-viscosity hydrogel solution is atomized in the two piezoelectric atomizing processes;
3. the base is fixedly provided with a first sliding rail and a supporting arm; the first sliding rail is arranged along the Y axis, a first sliding block is arranged on the first sliding rail in a sliding manner, the heating platform is connected with the first sliding block through a leveling bolt, a second sliding rail is arranged on the supporting arm, the second sliding rail is arranged along the X axis, the moving plate is in sliding connection with the second sliding rail through the second sliding block, a third sliding rail is arranged on the surface, far away from the second sliding block, of the moving plate, and the third sliding rail is arranged along the Z axis; the large-breadth coating can be effectively prepared through precise three-dimensional movement, and the coating uniformity at corners of a non-circular substrate can be ensured.
4. The thickness of the coating can be effectively controlled through multiple spraying processes, and the water contact angle of the coating can completely reach a hydrophilic state after the coating is covered by the polyvinyl alcohol coating for 3 times.
Drawings
FIG. 1 is a schematic diagram of a piezoelectric atomizing jet printing apparatus according to the present application;
FIG. 2 is a cross-sectional view of the structure of the atomizer of the present application;
FIG. 3 is a schematic illustration of the substrate after the coating has been prepared;
FIG. 4 is a field emission electron microscopy image (right) of a hydrophilic coating of the application spray printed on a substrate and a field emission electron microscopy image (left) without hydrophilic treatment;
fig. 5 is a water contact angle image of a hydrophilic coating prepared in accordance with the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Example 1
As shown in fig. 1-2, the piezoelectric atomizing jet printing device comprises a base 1, wherein a supporting seat 2 and a supporting arm 5 are fixedly arranged on the base 1; be provided with first spout 2-1 on the supporting seat 2, first spout 2-1 sets up along the Y axle, slidable mounting has first slider 3 on the first spout 2-1, and heating platform 4 passes through leveling bolt and is connected with first slider 3, sets up second spout 6 on the support arm 5, second spout 6 sets up along the X axle, and movable plate 7 passes through second slider 7-1 and 6 sliding connection of second spout, the surface that movable plate 7 kept away from second slider 7-1 is provided with third spout 7-2, the third spout sets up along the Z axle, shower nozzle anchor clamps 8 with third spout 7-2 sliding connection, and atomizer 9 passes through cross bolt and hex nuts to be fixed shower nozzle anchor clamps 8's front end.
The atomizing nozzle 9 comprises an upper shell 11, a lower shell 14, a luffing rod 15 and a focusing nozzle 19, wherein the upper shell 11 and the lower shell 14 are fixedly connected through four M4 bolts, the luffing rod 15 is sequentially provided with a cylindrical part, a flange part and a conical part from top to bottom, and a liquid supply channel 10 is formed in the luffing rod 15; a cylindrical cavity is formed between the upper shell 11 and the lower shell 14, a second piezoelectric transducer 18, a gasket 17, a microporous net 16 and an amplitude transformer sleeve 13 are sequentially arranged in the cavity from bottom to top, a conical cavity is formed in the amplitude transformer sleeve 13, a conical part of the amplitude transformer 15 is matched with the conical cavity, a first piezoelectric transducer 12 is arranged on the upper surface of a flange part of the amplitude transformer 15, and a cylindrical part of the amplitude transformer 15 extends out of the upper shell 11; a focusing nozzle 19 is provided below the lower housing 14.
Example 2
A method for preparing a hydrophilic coating based on piezoelectric atomizing jet printing equipment, which comprises the following steps:
A0. preparing a polyvinyl alcohol (PVA) aqueous solution, and filling the prepared PVA aqueous solution into a liquid storage bottle;
A1. performing transient hydrophilic treatment on the surface of the hydrophobic substrate material by using oxygen plasma;
A2. spraying a polyvinyl alcohol coating:
uniformly spraying a polyvinyl alcohol aqueous solution on the surface of a substrate material; curing the polyvinyl alcohol aqueous solution sprayed on the surface of the substrate by heating and drying;
A3. and (3) executing the step A2 for a plurality of times, and finally obtaining the hydrophilic polyvinyl alcohol coating with the expected thickness on the surface of the hydrophobic substrate material.
The specific operation process for preparing the polyvinyl alcohol aqueous solution in the step A0 is as follows: adding polyvinyl alcohol powder and deionized water into a magnetic stirring water area pot according to a proportion, heating to 100 ℃, stirring for 2.5 hours by using a magnetic stirrer, enabling powdery polyvinyl alcohol to be rapidly dissolved, standing to enable the temperature to be reduced to normal temperature, and filling into a liquid storage bottle to obtain the required polyvinyl alcohol aqueous solution.
The molecular weight of the polyvinyl alcohol is 63800-72600, but is not limited to the molecular weight of the polyvinyl alcohol, the mass fraction is 1%, and the mass fraction is relative to the mass of deionized water, taking 100 g of deionized water as an example, and 1 g of the polyvinyl alcohol is needed to be added.
The specific operation steps of spraying the polyvinyl alcohol coating in the step A2 are as follows:
a21: the heating platform 4 is controlled by the controller to move to a proper position, and the substrate material processed in the step A1 is placed on the heating platform 4; setting the temperature of the heating platform 4 to 90 ℃;
a22: a teflon hose was used to connect the reservoir to the inlet of the supply channel 10; the controller controls the atomizer 9 to move along the X axis and the Z axis until the atomizer 9 moves onto the substrate material;
a23, opening a switch of the heating platform 4, and waiting for the heating platform 4 to heat to 90 ℃; an alternating current power supply is started, sinusoidal alternating current voltage is supplied to the first piezoelectric transducer 12 and the second piezoelectric transducer 18, vibration is transmitted to the amplitude transformer 15 after the first piezoelectric transducer 12 is electrified, and vibration is transmitted to the micropore network 16 after the second piezoelectric transducer 18 is electrified;
a23, starting an injection pump, and continuously pumping a polyvinyl alcohol aqueous solution into the liquid supply channel 10; then the polyvinyl alcohol aqueous solution is pressed into the cavity of the amplitude transformer 15, and the amplitude transformer 15 vibrates to atomize the polyvinyl alcohol aqueous solution for the first time; the polyvinyl alcohol aqueous solution after the first atomization passes through the microporous net 16 and is atomized by the vibration of the microporous net 16 for the second time; the atomized micro-droplets after secondary atomization are sprayed out through a conical focusing nozzle 19 and are attached to a substrate material;
because the prepared polyvinyl alcohol aqueous solution has larger viscosity, the horn sleeve, the micropore net, the first piezoelectric transducer and the second piezoelectric transducer are arranged in the atomizing nozzle, the first piezoelectric transducer transmits vibration to the horn after being electrified, the second piezoelectric transducer transmits vibration to the micropore net after being electrified, and the high-viscosity hydrogel solution is atomized in the two piezoelectric atomizing processes;
a24: the heating platform 4 is controlled by the controller to move along the Y axis, and the atomizing nozzle 9 is controlled to move along the X axis, so that the atomizing nozzle 9 performs covering repetitive movement along the surface of the substrate material, and the whole surface of the substrate material is uniformly covered with polyvinyl alcohol micro-droplets;
a25: after the polyvinyl alcohol microdroplet on the surface of the substrate material is completely dried and solidified, the heating platform is closed, and the solidified hydrophilic polyvinyl alcohol hydrogel coating (shown in figure 4) is prepared, the hydrophilicity of which is shown in figure 5, and after the polyvinyl alcohol microdroplet is covered by the PVA coating for 3 times, the water contact angle of the polyvinyl alcohol microdroplet can completely reach the hydrophilic state.
The substrate material is silicon wafer with hydrophobic surface or Polydimethylsiloxane (PDMS).
The above embodiments are only for illustrating the embodiments of the present application, but not for limiting the embodiments of the present application, and various changes and modifications may be made by one skilled in the relevant art without departing from the spirit and scope of the embodiments of the present application, so that all equivalent technical solutions also fall within the scope of the embodiments of the present application, and the scope of the embodiments of the present application should be defined by the claims.
Claims (7)
1. The piezoelectric atomizing jet printing equipment is characterized by comprising a base (1), wherein a supporting seat (2) and a supporting arm (5) are fixedly arranged on the base (1); be provided with first spout (2-1) on supporting seat (2), first spout (2-1) sets up along the Y axle, slidable mounting has first slider (3) on first spout (2-1), and heating platform (4) are connected with first slider (3) through leveling bolt, set up second spout (6) on support arm (5), second spout (6) set up along the X axle, and movable plate (7) are through second slider (7-1) and second spout (6) sliding connection, the surface that second slider (7-1) was kept away from to movable plate (7) is provided with third spout (7-2), third spout sets up along the Z axle, shower nozzle anchor clamps (8) with third spout (7-2) sliding connection, atomizer (9) are fixed through cross bolt and hex nut the front end of shower nozzle anchor clamps (8).
2. The piezoelectric atomizing jet printing device according to claim 1, wherein the atomizing nozzle (9) comprises an upper shell (11), a lower shell (14), an amplitude transformer (15) and a focusing nozzle (19), the upper shell (11) and the lower shell (14) are fixedly connected through four M4 bolts, the amplitude transformer (15) comprises a cylindrical part, a flange part and a conical part from top to bottom in sequence, and a liquid supply channel (10) is formed in the amplitude transformer (15); a cylindrical cavity is formed between the upper shell (11) and the lower shell (14), a second piezoelectric transducer (18), a gasket (17), a microporous net (16) and an amplitude transformer sleeve (13) are sequentially arranged in the cavity from bottom to top, a conical cavity is formed in the amplitude transformer sleeve (13), a conical part of the amplitude transformer (15) is matched with the conical cavity, a first piezoelectric transducer (12) is arranged on the upper surface of a flange part of the amplitude transformer (15), and a cylindrical part of the amplitude transformer (15) extends out of the upper shell (11); a focusing nozzle (19) is provided below the lower housing (14).
3. A method for preparing a hydrophilic coating based on the piezo aerosol spray device of claim 2, comprising the steps of:
A0. preparing a polyvinyl alcohol aqueous solution, and filling the prepared polyvinyl alcohol aqueous solution into a liquid storage bottle;
A1. performing transient hydrophilic treatment on the surface of the hydrophobic substrate material by using oxygen plasma;
A2. spraying a polyvinyl alcohol coating:
uniformly spraying a polyvinyl alcohol aqueous solution on the surface of a substrate material; curing the polyvinyl alcohol aqueous solution sprayed on the surface of the substrate by heating and drying;
A3. and (3) executing the step A2 for a plurality of times, and finally obtaining the hydrophilic polyvinyl alcohol coating with the expected thickness on the surface of the hydrophobic substrate material.
4. The method according to claim 3, wherein the specific operation of preparing the aqueous solution of polyvinyl alcohol in the step A0 is as follows: adding polyvinyl alcohol powder and deionized water into a magnetic stirring water area pot according to a proportion, heating to 100 ℃, stirring for 2.5 hours by using a magnetic stirrer, enabling powdery polyvinyl alcohol to be rapidly dissolved, standing to enable the temperature to be reduced to normal temperature, and filling into a liquid storage bottle to obtain the required polyvinyl alcohol aqueous solution.
5. A method according to claim 3, wherein the polyvinyl alcohol has a molecular weight of 63800-72600 and the mass fraction of polyvinyl alcohol in the aqueous solution of polyvinyl alcohol is 1%.
6. A method according to claim 3, wherein the specific operation of spraying the polyvinyl alcohol coating in step A2 is as follows:
a21: the heating platform (4) is controlled by the controller to move to a proper position, and the substrate material processed in the step A1 is placed on the heating platform (4); setting the temperature of the heating platform (4) to 90 ℃;
a22: connecting the liquid storage bottle with the inlet of the liquid supply channel (10) by using a Teflon hose; the atomizing nozzle (9) is controlled by the controller to move along the X axis and the Z axis until the atomizing nozzle (9) moves to the upper surface of the substrate material;
a23, starting a switch of the heating platform (4) to wait for the heating platform (4) to heat to 90 ℃; an alternating current power supply is started, sinusoidal alternating current voltage is supplied to the first piezoelectric transducer (12) and the second piezoelectric transducer (18), vibration is transmitted to the amplitude transformer (15) after the first piezoelectric transducer (12) is electrified, and vibration is transmitted to the microporous net (16) after the second piezoelectric transducer (18) is electrified;
a23, starting an injection pump, and continuously pumping a polyvinyl alcohol aqueous solution into the liquid supply channel (10); then the polyvinyl alcohol aqueous solution is pressed into the cavity of the amplitude transformer (15), and the amplitude transformer (15) vibrates to atomize the polyvinyl alcohol aqueous solution for the first time; the polyvinyl alcohol aqueous solution after the first atomization passes through a microporous net (16) and is atomized by the vibration of the microporous net (16) for the second time; the atomized micro-droplets after secondary atomization are sprayed out through a conical focusing nozzle (19) and are attached to a substrate material;
a24: the heating platform (4) is controlled by the controller to move along the Y axis, and the atomizing nozzle (9) is controlled to move along the X axis, so that the atomizing nozzle (9) can repeatedly move along the surface of the substrate material, and the whole surface of the substrate material is uniformly covered with polyvinyl alcohol micro-droplets;
a25: and after the polyvinyl alcohol micro-droplets on the surface of the substrate material are completely dried and solidified, closing the heating platform to prepare the solidified hydrophilic polyvinyl alcohol hydrogel coating.
7. A method according to claim 3, wherein the substrate material is a silicon wafer or polydimethylsiloxane having a hydrophobic surface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310624425.9A CN116651679A (en) | 2023-05-29 | 2023-05-29 | Piezoelectric atomizing jet printing equipment and method for preparing hydrophilic coating |
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