Method for preparing high-stability interface circuit through aerosol printing

Abstract

The invention relates to a method for preparing a high-stability interface circuit through aerosol printing. The method comprises the steps that S1, a flexible substrate is prepared; s2, preparing conductive ink; and S3, printing a circuit. The conductive material is in seamless contact with a flexible substrate, and the good adhesion and conformality of the conductive material can meet the requirement that the conductive material does not fall off in the application process of bending, stretching and scraping of flexible electronics, and the lasting and good conductive performance is kept; patterned circuits and circuits with high-stability interfaces can be obtained at the same time, and the method can be used for electronic information products such as precise electronic circuits, antenna technologies, sensitive components and other electronic components and has high practical application value.

Description

Technical Field

[0001] The invention belongs to the technical field of stable flexible electronic interfaces, and in particular relates to a method for preparing a highly stable interface circuit by aerosol printing. Background Art

[0002] At present, the interface assembly of electronic devices is mainly achieved through physical effects such as hydrogen bonding, electrostatic effects, and isomerization. The formed interface is unstable and easily falls off under the action of external forces. The unstable connection between the conductive material and the substrate will lead to the reduction of the performance of the electronic device. Therefore, the stable connection between the conductive material and the substrate is crucial to the performance of the electronic device.

[0003] Aerosol microjet printing technology is an emerging digital high-speed direct-write printing technology with the characteristics of high precision, high efficiency, high viscosity, and non-contact. The printing line accuracy can reach the micron level, and high-resolution precision forming can be achieved. It can deposit functional coatings on the surface of complex curved substrates with high precision through gas protection. It has excellent adhesion and conformality, and has broad application prospects in the field of flexible electronic device manufacturing.

[0004] Therefore, the present invention aims to provide a method for preparing a highly stable interface circuit by aerosol printing. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for preparing a highly stable interface circuit by aerosol printing, in which the conductive material is in seamless contact with the flexible substrate, and its good adhesion and conformality can meet the requirements of flexible electronics for preventing the conductive material from falling off and maintaining long-lasting good conductive properties during bending, stretching, and scratching applications; patterned circuits and circuits with highly stable interfaces can be obtained at the same time, which can be used for electronic information products such as precision electronic circuits, antenna processes, sensitive components and other electronic components, and has high practical application value.

[0006] The present invention solves the technical problem by the following technical solutions:

[0007] A method for preparing a high-stability interface circuit by aerosol printing, the method comprising the following steps:

[0008] S1, mixing an elastomer precursor, an initiator and a silane coupling agent uniformly, and curing to obtain a surface-reactive elastomer substrate;

[0009] S2, uniformly mixing the conductive material containing hydroxyl groups on the interface, the auxiliary conductive material and the solvent to obtain a conductive ink with atomization performance;

[0010] S3. Design the required circuit pattern through drawing software, and use aerosol printing to directly print the conductive ink obtained in S2 on the surface-reactive elastomer substrate obtained in S1 according to the required pattern, and let it dry to obtain a highly stable interface circuit.

[0011] Moreover, the weight percentages of the components of the surface-reactive elastomer substrate are:

[0012] Elastomer precursor 80%~95%

[0013] Initiator 2%~10%

[0014] Silane coupling agent 3%~18%.

[0015] Moreover, the elastomer precursor is polyurethane or polydimethylsiloxane; the silane coupling agent is one or more of vinyl triethoxysilane, benzylaminomethyl trimethoxysilane, vinyl tri-β-methoxyethoxysilane, chloromethyl triethoxysilane, 2-methacryloyloxyethyl dimethyl-3-trimethoxysilylpropyl ammonium oxide, and 3-acetocyanate propyl triethoxysilane; and the initiator is a thermal initiator or a photoinitiator.

[0016] Moreover, the weight percentage of each component of the conductive ink is:

[0017] Conductive materials containing hydroxyl groups 20% to 50%

[0018] Auxiliary conductive materials 10%~40%

[0019] Solvent 40%~70%.

[0020] Moreover, the hydroxyl-containing conductive material is one or more of carbon nanotubes, nano copper particles, Ti3C2Tx, and graphene.

[0021] Moreover, the auxiliary conductive material is one or more of nano silver particles, polypyrrole, poly (3,4-ethylenedioxythiophene)-polystyrene sulfonic acid, polyaminoindole, and polyaniline.

[0022] Moreover, the solvent is one or more of ethanol, deionized water, glycerol, and ethylene glycol.

[0023] Furthermore, the aerosol printing method is to inject the conductive ink into the ink cartridge, fix the surface-reactive elastomer substrate on the printing platform, and spray the conductive ink at a speed of 1 to 20 mm s -1 Complete printing at the speed of

[0024] The advantages and beneficial effects of the present invention are:

[0025] 1. The present invention adopts aerosol, a simple, fast and digital printing method, combined with the characteristics of conductive materials and flexible substrates, to simultaneously obtain the two characteristics of patterning and highly stable interface, thereby improving the stability of electronic devices.

[0026] 2. The conductive material of the present invention is in seamless contact with the flexible substrate, and its good adhesion and conformality can ensure that the conductive material does not fall off and maintains long-lasting good conductive properties during the bending, stretching and scratching of flexible electronics. Patterned circuits and circuits with highly stable interfaces can be obtained at the same time, which can be used for electronic information products such as precision electronic circuits, antenna processes, sensitive components and other electronic components, and has high practical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of interface peeling of the present invention;

[0028] Figure 2 This is a schematic diagram of the resistance change rate of the interface peeling experiment of the present invention;

[0029] Figure 3 It is a schematic diagram of the interface ultrasound of the present invention;

[0030] Figure 4 This is a schematic diagram of the resistance change rate of the interface ultrasonic experiment of the present invention;

[0031] Figure 5 It is a schematic diagram of different times of bending of the interface of the present invention;

[0032] Figure 6 This is the irregular curved surface circuit diagram obtained in Examples 1 and 2 of the present invention. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below through specific examples. The following examples are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0034] Example 1

[0035] A method for preparing a highly stable interface circuit by aerosol printing, the innovation of which lies in the steps of:

[0036] (1) preparing a flexible substrate: mixing a polydimethylsiloxane elastomer precursor and chloromethyltriethoxysilane in a mass ratio of 90:10, adding 1 wt % of a photoinitiator 2,2-dimethoxy-2-phenylacetophenone and stirring evenly, centrifuging for 15 minutes, pouring the obtained flexible substrate polymer precursor into a mold, and curing to obtain a surface-reactive elastomer substrate;

[0037] (2) preparing a conductive ink: mixing a graphene solution having a concentration of 10 mg / mL and poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid in a mass ratio of 50:50, adding a 2 wt % ethylene glycol solution, and mixing well to obtain a conductive ink having atomization performance;

[0038] (3) Printing circuit: Design the required circuit pattern using drawing software, and use aerosol printing to inject 5 g of the conductive ink prepared in step 2) into the ink cartridge of the aerosol printer. Use a nozzle with a diameter of 310 μm. Fix the polydimethylsiloxane flexible substrate prepared in step 1) on the printing platform, and adjust the nozzle diameter to be 10 μm higher than the lower substrate surface. Make the ink spray at a focusing ratio of 2 at a speed of 5 mm s -1 The conductive ink is printed on the polydimethylsiloxane flexible substrate according to the circuit pattern at a speed and allowed to dry to obtain the desired circuit.

[0039] As shown in the figure, the circuit pattern printed in Example 1 can be printed into different irregular curved circuits; Figure 1 , Figure 3 , Figure 5 The interface stability was investigated by peeling, ultrasound, and bending. Figure 5 The interface is not easy to fall off after multiple bending and folding. Figure 2 , 4 The change rate of the interface resistance after multiple peeling and ultrasonic testing is analyzed, which shows that after multiple peeling and long-term ultrasonic treatment, the interface stability of the present invention is better.

[0040] Example 2

[0041] A method for preparing a highly stable interface circuit by aerosol printing, the innovation of which lies in the steps of:

[0042] (1) preparing a flexible substrate: a polyurethane elastomer precursor and 3-acetocyanatepropyltriethoxysilane were mixed in a mass ratio of 70:30, 5 wt % of a thermal initiator potassium persulfate was added, and the mixture was quickly stirred evenly. After centrifugation for 5 minutes, the mixture was cured to obtain a surface-reactive elastomer substrate;

[0043] (2) preparing a conductive ink: mixing a Ti3C2Tx solution having a concentration of 18 mg / mL and polypyrrole in a mass ratio of 75:25, adding a 2 wt % ethanol solution, and mixing well to obtain a conductive ink having atomization performance;

[0044] (3) Printing circuit: Design the required circuit pattern using drawing software, and use aerosol printing to inject 5 g of the conductive ink prepared in step 2) into the ink cartridge of the aerosol printer. Use a nozzle with a diameter of 490 μm. Fix the polyurethane flexible substrate prepared in step 1) on the printing platform, and adjust the nozzle diameter to be 10 μm higher than the lower substrate surface. The ink is sprayed at a speed of 10 mm s under a focusing ratio of 6. -1 The conductive ink is printed on the polyurethane flexible substrate according to the circuit pattern at a speed and allowed to dry to obtain the desired circuit.

[0045] Example 3

[0046] A method for preparing a highly stable interface circuit by aerosol printing, the innovation of which lies in the steps of:

[0047] (1) preparing a flexible substrate: mixing a polydimethylsiloxane elastomer precursor and vinyl triethoxysilane in a mass ratio of 85:15, adding 3 wt % of a photoinitiator potassium persulfate and stirring quickly and uniformly, centrifuging for 5 minutes, pouring the obtained flexible substrate polymer precursor into a mold, and curing to obtain a surface-reactive elastomer substrate;

[0048] (2) preparing a conductive ink: mixing a carbon nanotube solution with a concentration of 5 mg / mL and nanosilver particles in a mass ratio of 80:20, adding an 8 wt % propylene glycol solution, and mixing well to obtain a conductive ink with atomization performance;

[0049] (3) Printing circuit: Design the required circuit pattern using drawing software, and use aerosol printing to inject 5 g of the conductive ink prepared in step 2) into the ink cartridge of the aerosol printer. Use a nozzle with a diameter of 260 μm. Fix the polydimethylsiloxane flexible substrate prepared in step 1) on the printing platform, and adjust the nozzle diameter to be 10 μm higher than the lower substrate surface. Make the ink spray at a focusing ratio of 6 at a speed of 1 mm s -1 The conductive ink is printed on the polydimethylsiloxane flexible substrate according to the circuit pattern at a speed and allowed to dry to obtain the desired circuit.

[0050] Example 4

[0051] A method for preparing a highly stable interface circuit by aerosol printing, the innovation of which lies in the steps of:

[0052] (1) preparing a flexible substrate: a polyurethane elastomer precursor and 2-methacryloyloxyethyl dimethyl-(3-trimethoxysilylpropyl) ammonium oxide were mixed in a mass ratio of 65:35, 6 wt % of a photoinitiator 1-hydroxycyclohexyl phenyl ketone was added, and the mixture was quickly stirred evenly. After centrifugation for 5 minutes, the obtained flexible substrate polymer precursor was poured into a mold, and cured to obtain a surface-reactive elastomer substrate;

[0053] (2) preparing a conductive ink: mixing a 15 mg / mL nano copper particle solution and polyaniline in a mass ratio of 65:35, adding a 10 wt % deionized water solution, and mixing well to obtain a conductive ink with atomization performance;

[0054] (3) Printing circuit: Design the required circuit pattern using drawing software, and use aerosol printing to inject 5 g of the conductive ink prepared in step 2) into the ink cartridge of the aerosol printer. Use a nozzle with a diameter of 340 μm. Fix the polyurethane flexible substrate prepared in step 1) on the printing platform, and adjust the nozzle diameter to be 10 μm higher than the lower substrate surface. Make the ink spray at a focusing ratio of 8 at a speed of 15 mm s -1 The conductive ink is printed on the polyurethane flexible substrate according to the circuit pattern at a speed and allowed to dry to obtain the desired circuit.

[0055] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A method for preparing a highly stable interface circuit by aerosol printing, characterized in that: The steps of the method are: S1, mixing an elastomer precursor, an initiator and a silane coupling agent uniformly, and curing to obtain a surface-reactive elastomer substrate; S2, uniformly mixing the conductive material containing hydroxyl groups on the interface, the auxiliary conductive material and the solvent to obtain a conductive ink with atomization performance; S3. Design the required circuit pattern through drawing software, and use aerosol printing to directly print the conductive ink obtained in S2 on the surface-reactive elastomer substrate obtained in S1 according to the required pattern, and let it dry to obtain a highly stable interface circuit.

2. The method for preparing a highly stable interface circuit by aerosol printing according to claim 1, characterized in that: The weight percentages of the components of the surface-reactive elastomer substrate are: Elastomer precursor 80%~95% Initiator 2%~10% Silane coupling agent 3%~18%.

3. The method for preparing a highly stable interface circuit by aerosol printing according to claim 1, characterized in that: The elastomer precursor is polyurethane or polydimethylsiloxane; the silane coupling agent is one or more of vinyl triethoxysilane, benzylaminomethyl trimethoxysilane, vinyl tri-β-methoxyethoxysilane, chloromethyl triethoxysilane, 2-methacryloyloxyethyl dimethyl-3-trimethoxysilylpropyl ammonium oxide, and 3-acetocyanate propyl triethoxysilane; and the initiator is a thermal initiator or a photoinitiator.

4. The method for preparing a highly stable interface circuit by aerosol printing according to claim 1, characterized in that: The weight percentages of the components of the conductive ink are: Conductive materials containing hydroxyl groups 20% to 50% Auxiliary conductive materials 10%~40% Solvent 40%~70%.

5. The method for preparing a highly stable interface circuit by aerosol printing according to claim 1, characterized in that: The hydroxyl-containing conductive material is one or more of carbon nanotubes, nano copper particles, Ti3C2Tx, and graphene.

6. The method for preparing a highly stable interface circuit by aerosol printing according to claim 1, characterized in that: The auxiliary conductive material is one or more of nano silver particles, polypyrrole, poly (3,4-ethylenedioxythiophene)-polystyrene sulfonic acid, polyaminoindole and polyaniline.

7. The method for preparing a highly stable interface circuit by aerosol printing according to claim 1, characterized in that: The solvent is one or more of ethanol, deionized water, glycerol and ethylene glycol.

8. The method for preparing a highly stable interface circuit by aerosol printing according to claim 1, characterized in that: The aerosol printing method is to inject the conductive ink into the ink cartridge, fix the surface-reactive elastomer substrate on the printing platform, and print the conductive ink at a speed of 1 to 20 mm s -1 Complete printing at a speed of

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