Conductive ink as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of conductive ink materials, and particularly relates to conductive ink and a preparation method and application thereof. Based on the composite synergistic effect of the nano-silver particles and the graphene, the conductive ink suitable for the pen is provided, good writing experience can be provided while high conductivity is kept, and the conductive ink is suitable for various paper base materials. The conductive ink provided by the invention has relatively high safety and relatively low cost, and is suitable for being widely used in schools and popular science venues.

Description

Technical Field

[0001] The present invention belongs to the technical field of conductive ink materials, and particularly relates to a conductive ink, a preparation method thereof and an application thereof. Background Art

[0002] As a functional material, conductive ink has been widely used in the fields of science popularization and cultural and creative industries in recent years. And fountain pen conductive ink is expected to provide another intuitive and easy-to-operate tool for science popularization education. Through simple drawing on ordinary paper substrates, students and visitors can quickly understand the basic principles of circuits, such as the flow of electric current, the closing of circuits, etc. For example, by using a conductive ink pen to draw a circuit on paper and combining it with an LED lamp and a battery, a simple circuit lighting experiment can be achieved. This intuitive experience method helps to stimulate learning interest and lower the learning threshold of electronics.

[0003] As a traditional writing tool, although the fountain pen faces many challenges in the digital age, it still has unique advantages. The fountain pen has a smooth writing feeling and rich stroke variations. When combined with conductive ink, it also has great application potential in the cultural and creative field.

[0004] However, there may be some compatibility problems when the existing conductive ink is written with a fountain pen. For example, the viscosity and fluidity of the ink are not suitable for the writing mechanism of the fountain pen, resulting in unsmooth writing or ink breakage. When used on different papers, there are writing suitability problems, which have a negative impact on the quality and stability of the written wires. In addition, the chemical composition of the existing conductive ink may react with the materials of the fountain pen, affecting the performance of the nib or the ink sac; the dispersion system is not stable enough, and precipitation or stratification is likely to occur after long-term storage. Summary of the Invention

[0005] The purpose of the present invention is to provide a conductive ink, a preparation method thereof and an application thereof.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] The present invention provides a conductive ink, comprising the following components in mass percentage:

[0008] 1-20% of silver nanoparticles, 0.5-5% of graphene, 70-98% of solvent, 0.5-2.5% of binder, 0.1-1% of dispersant and 0.1-1% of stabilizer;

[0009] The solvent includes water and alcohol solvents.

[0010] Preferably, the mass ratio of the water to the alcohol solvents is 1:10-10:1;

[0011] The alcohol solvent includes at least one of ethanol, ethylene glycol, glycerol, and isopropanol.

[0012] Preferably, the particle size of the silver nanoparticles is 20 nm to 500 nm.

[0013] Preferably, the microplate diameter of the graphene is 10 nm to 1 μm.

[0014] Preferably, the binder includes at least one of polyvinylpyrrolidone and polyethylene glycol;

[0015] The dispersant includes sodium dodecyl sulfate;

[0016] The stabilizer includes at least one of sodium citrate and polyvinyl alcohol.

[0017] Preferably, the viscosity of the conductive ink is 5 to 50 mPa·s; the pH value of the conductive ink is 6.5 to 7.5.

[0018] The present invention also provides a preparation method of the conductive ink according to the above technical solution, including the following steps:

[0019] Step 1: Disperse the silver nanoparticles and graphene in a part of water to obtain a first dispersion;

[0020] Step 2: Disperse the dispersant and stabilizer in the remaining water and alcohol solvent to obtain a second dispersion;

[0021] Step 3: Add the first dispersion into the second dispersion, and stir to obtain a third dispersion;

[0022] Step 4: Add the binder into the third dispersion, and stir and ultrasonicate in sequence to obtain the conductive ink.

[0023] Preferably, in Step 1, the dispersion is carried out under ultrasonic conditions, the ultrasonic time is 30 min to 2 h, and the ultrasonic power is 100 to 200 W;

[0024] In Step 2, the dispersion is carried out under stirring conditions, the stirring time is 20 min to 2 h, and the stirring speed is 500 to 1000 rpm.

[0025] Preferably, in Step 3, the stirring time is 1 h, and the stirring speed is 500 to 1000 rpm;

[0026] In Step 4, the stirring time is 30 min to 2 h, and the stirring speed is 500 to 1000 rpm.

[0027] The present invention also provides an application of the conductive ink described in the above technical solution or the conductive ink prepared by the preparation method described in the above technical solution in a fountain pen, and the application includes:

[0028] Pour the conductive ink into a fountain pen and write to form a conductive imprint on the surface of the substrate.

[0029] The present invention provides a conductive ink, which comprises the following components in mass percentage: 1-20% of silver nanoparticles, 0.5-5% of graphene, 70-98% of a solvent, 0.5-2.5% of an adhesive, 0.1-1% of a dispersant, and 0.1-1% of a stabilizer; the solvent includes water and an alcohol solvent.

[0030] Compared with the prior art, the advantages of the present invention are as follows:

[0031] (1) Based on the composite synergistic effect of silver nanoparticles and graphene, the present invention proposes a conductive ink applicable to a fountain pen, which can provide a good writing experience while maintaining high conductivity and is applicable to a variety of paper substrates. The conductive ink provided by the present invention has high safety and low cost, and is suitable for wide use in schools and popular science venues.

[0032] (3) Since silver nanoparticles and graphene are used as conductive fillers, the imprint after ink writing has electrical conductivity. This conductive ink can be filled into an ordinary fountain pen, writes smoothly, and is applicable to a variety of paper substrates, such as photographic paper, coated paper, etc. The ink can still maintain good conductivity and fluidity after long-term storage, and is not easy to precipitate or block the fountain pen.

[0033] (3) Both silver nanoparticles and graphene are environmentally friendly materials, meeting the requirements of modern green chemistry. The track drawn by this conductive ink has good conductivity after drying and can be used in the fields of electronics, popular science, cultural and creative products, etc. The advantages of this technology mainly come from the inorganic-organic composite effect of silver nanoparticles and graphene, which can realize the drawing of a continuous conductive coating on the surface of a paper substrate at a lower concentration of conductive filler. Description of the Drawings

[0034] Figure 1 It is a physical diagram of the conductive ink obtained in Example 1;

[0035] Figure 2 It is a physical diagram of the fountain pen used in the application example;

[0036] Figure 3 It is a conductive imprint formed by the conductive ink obtained in Example 1 in the application example;

[0037] Figure 4 It is an LED colored light lit by the conductive imprint formed by the conductive ink of Example 1 in the application example. Detailed Embodiments

[0038] The present invention provides a conductive ink, which comprises components with the following mass percentages:

[0039] 1-20% of silver nanoparticles, 0.5-5% of graphene, 70-98% of a solvent, 0.5-2.5% of an adhesive, 0.1-1% of a dispersant, and 0.1-1% of a stabilizer;

[0040] The solvent includes water and an alcohol solvent.

[0041] The conductive ink provided by the present invention includes 1-20% of silver nanoparticles by mass percentage, specifically, it can be 1%, 5%, 10%, 15%, 20%. In the present invention, the particle size of the silver nanoparticles is preferably 20nm-500nm, specifically, it can be 20nm, 50nm, 100nm, 150nm, 200nm, 250nm, 300nm, 400nm, 500nm.

[0042] The conductive ink provided by the present invention includes 0.5-5% of graphene by mass percentage, specifically, it can be 0.5%, 1.0%, 2.0%, 3.0%, 4.0%, 5.0%. In the present invention, the microplate diameter of the graphene is preferably 10nm-1μm, specifically, it can be 10nm, 100nm, 200nm, 300nm, 400nm, 500nm, 600nm, 700nm, 800nm, 900nm, 1μm.

[0043] The conductive ink provided by the present invention includes 70-98% of a solvent by mass percentage, specifically, it can be 70%, 75%, 80%, 85%, 90%, 95%, 98%. In the present invention, the solvent includes water and an alcohol solvent, and the alcohol solvent preferably includes at least one of ethanol, ethylene glycol, glycerol, and isopropanol. In the present invention, the water is preferably deionized water. In the present invention, the mass ratio of the water to the alcohol solvent is preferably 1:10-10:1, specifically, it can be 1:10, 1:5, 1:2, 1:1, 2:1, 5:1, 10:1.

[0044] The conductive ink provided by the present invention includes 0.5-2.5% of an adhesive by mass percentage, specifically, it can be 0.5%, 1.0%, 1.5%, 2.0%, 2.5%. In the present invention, the adhesive preferably includes at least one of polyvinylpyrrolidone (PVP) and polyethylene glycol (PEG).

[0045] The conductive ink provided by the present invention comprises a dispersant with a mass percentage of 0.1 to 1%, specifically it can be 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%. In the present invention, the dispersant preferably comprises sodium dodecyl sulfate (SDS).

[0046] The conductive ink provided by the present invention comprises a stabilizer with a mass percentage of 0.1 to 1%, specifically it can be 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%. In the present invention, the stabilizer preferably comprises at least one of sodium citrate and polyvinyl alcohol (PVA).

[0047] In the present invention, the viscosity of the conductive ink is preferably 5 to 50 mPa·s; the pH value of the conductive ink is preferably 6.5 to 7.5.

[0048] The present invention also provides a preparation method of the conductive ink according to the above technical solution, comprising the following steps:

[0049] Step 1: Disperse nano silver particles and graphene in a part of water to obtain a first dispersion liquid;

[0050] Step 2: Disperse the dispersant and the stabilizer in the remaining water and an alcohol solvent to obtain a second dispersion liquid;

[0051] Step 3: Add the first dispersion liquid to the second dispersion liquid and stir to obtain a third dispersion liquid;

[0052] Step 4: Add an adhesive to the third dispersion liquid, stir and perform ultrasonic treatment in sequence to obtain the conductive ink.

[0053] The present invention disperses nano silver particles and graphene in a part of water to obtain a first dispersion liquid. In the present invention, the dispersion is preferably carried out under ultrasonic conditions, the ultrasonic time is preferably 30 min to 2 h, and the ultrasonic power is preferably 100 to 200 W.

[0054] The present invention disperses the dispersant and the stabilizer in the remaining water and an alcohol solvent to obtain a second dispersion liquid. In the present invention, the mass ratio of the part of water to the remaining water is preferably 1:4 to 1:2. In the present invention, the dispersion is preferably carried out under stirring conditions, the stirring time is preferably 20 min to 2 h, more preferably 30 min, and the stirring speed is preferably 500 to 1000 rpm.

[0055] After obtaining the first dispersion liquid and the second dispersion liquid, the present invention adds the first dispersion liquid into the second dispersion liquid and obtains a third dispersion liquid through stirring. In the present invention, the stirring time is preferably 1 h, and the stirring speed is preferably 500 - 1000 rpm.

[0056] After obtaining the third dispersion liquid, the present invention adds an adhesive into the third dispersion liquid, stirs and then performs ultrasonic treatment in sequence to obtain the conductive ink. In the present invention, the stirring time is preferably 30 min - 2 h, and the stirring speed is preferably 500 - 1000 rpm.

[0057] In the present invention, steps 1 - 4 are all preferably carried out at normal temperature, and more preferably at 20 - 30 °C.

[0058] The present invention also provides the application of the conductive ink described in the above technical solution or the conductive ink prepared by the preparation method described in the above technical solution in a fountain pen. The application includes:

[0059] Pour the conductive ink into the fountain pen and write to form a conductive imprint on the surface of the substrate.

[0060] Unless otherwise specified, the materials and equipment used in the present invention are all commercially available products in the art.

[0061] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the embodiments in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0062] Example 1

[0063] In this example, the conductive ink includes 5 wt% of silver nanoparticles, 1 wt% of graphene, 46 wt% of deionized water, 23 wt% of ethylene glycol, 23 wt% of isopropanol, 1 wt% of PVP, 0.5 wt% of SDS, and 0.5 wt% of sodium citrate; among them, the particle size of the silver nanoparticles is 100 nm, the microplate diameter of the graphene is 500 nm, and the pH value of the conductive ink is 7.5;

[0064] Step 1: Disperse the silver nanoparticles and graphene in part of the deionized water, perform ultrasonic treatment for 30 min, and the ultrasonic power is 200 W to obtain the first dispersion liquid;

[0065] Step 2: Add a dispersant and a stabilizer into the remaining deionized water and alcohol solvents (where the mass ratio of part of the deionized water to the remaining deionized water is 1:3), and stir at a speed of 500 rpm for 20 min to obtain the second dispersion liquid;

[0066] Step 3: Slowly add the first dispersion into the second dispersion, and stir for 1 h at a rotation speed of 500 rpm to obtain a third dispersion;

[0067] Step 4: Add a binder to the third dispersion, stir for 30 min at a rotation speed of 500 rpm, and then perform ultrasonic treatment to obtain the conductive ink.

[0068] Example 2

[0069] In this example, the conductive ink includes 2.5 wt% of silver nanoparticles, 0.5 wt% of graphene, 48 wt% of deionized water, 48% of glycerol, 0.5 wt% of PVP, 0.25 wt% of SDS, and 0.25 wt% of sodium citrate; wherein, the particle size of the silver nanoparticles is 80 nm, the diameter of the graphene microflakes is 400 nm, and the pH value of the conductive ink is 7.0;

[0070] Step 1: Disperse the silver nanoparticles and graphene in deionized water, and perform ultrasonic treatment for 30 min with an ultrasonic power of 200 W to obtain a first dispersion;

[0071] Step 2: Add a dispersant and a stabilizer to the remaining deionized water and alcohol solvent (wherein the mass ratio of part of the deionized water to the remaining deionized water is 1:3), and stir for 20 min at a rotation speed of 500 rpm to obtain a second dispersion;

[0072] Step 3: Slowly add the first dispersion into the second dispersion, and stir for 1 h at a rotation speed of 500 rpm to obtain a third dispersion;

[0073] Step 4: Add a binder to the third dispersion, stir for 30 min at a rotation speed of 500 rpm, and then perform ultrasonic treatment to obtain the conductive ink.

[0074] Example 3

[0075] In this example, the conductive ink includes 15 wt% of silver nanoparticles, 3 wt% of graphene, 27.5 wt% of deionized water, 25 wt% of ethylene glycol, 25% of glycerol, 2.5 wt% of PVP, 1 wt% of SDS, and 1 wt% of sodium citrate; wherein, the particle size of the silver nanoparticles is 100 nm, the diameter of the graphene microflakes is 500 nm, and the pH value of the conductive ink is 7.5;

[0076] Step 1: Disperse the silver nanoparticles and graphene in deionized water, and perform ultrasonic treatment for 2 h with an ultrasonic power of 200 W to obtain a first dispersion;

[0077] Step 2: Add the dispersant and stabilizer to the remaining deionized water and alcohol solvent (where the mass ratio of part of the deionized water to the remaining deionized water is 1:3), stir at a speed of 1000 rpm for 1 h to obtain a second dispersion;

[0078] Step 3: Slowly add the first dispersion to the second dispersion, stir at a speed of 1000 rpm for 1 h to obtain a third dispersion;

[0079] Step 4: Add the binder to the third dispersion, stir at a speed of 1000 rpm for 2 h, and then perform ultrasonic treatment to obtain the conductive ink.

[0080] Application Example

[0081] Fill the conductive inks obtained in Examples 1 to 3 into pens respectively for writing to form conductive imprints on the substrate surface;

[0082] After connecting the power supply with the formed conductive imprints as wires, the LED color lights can be lit;

[0083] Figure 1 is the physical diagram of the conductive ink obtained in Example 1, Figure 2 is the physical diagram of the pen used, Figure 3 is the conductive imprint formed by the conductive ink of Example 1, Figure 4 is the lit LED color light.

[0084] Performance Test

[0085] Test the conductive inks obtained in the examples and the conductive imprints formed in the application examples, and the test data obtained are shown in Table 1;

[0086] Table 1 Performance Test Results of the Conductive Inks Obtained in the Examples

[0087] Example 1 Example 2 Example 3 Viscosity of conductive ink (mPa·s) 20 15 50 Resistivity of conductive imprint (Ω·cm) <![CDATA[5×10 -3 > <![CDATA[3×10 -3 > <![CDATA[1×10 -4 > Surface resistance of conductive imprint (Ω / □) 100 50 30

[0088] As can be seen from Table 1, the viscosities of the conductive inks of each example are relatively low, which can meet the requirements of pen filling and writing. The resistivity and surface resistance value of the writing imprints formed by the conductive inks are relatively low, which can meet the application requirements in the fields of electronics, cultural and creative, education, etc.

[0089] Although the above examples have described the present invention in detail, they are only a part of the embodiments of the present invention, rather than all embodiments. Other embodiments can also be obtained based on these embodiments without creative efforts, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A conductive ink, characterized in that, Comprising components with the following mass percentages: 1 - 20% of silver nanoparticles, 0.5 - 5% of graphene, 70 - 98% of solvent, 0.5 - 2.5% of binder, 0.1 - 1% of dispersant, and 0.1 - 1% of stabilizer; The solvent includes water and alcohol solvents.

2. The conductive ink according to claim 1, characterized in that, The mass ratio of the water to the alcohol solvents is 1:10 - 10:1; The alcohol solvents include at least one of ethanol, ethylene glycol, glycerol, and isopropanol.

3. The electrically conductive ink according to claim 1, wherein The particle size of the silver nanoparticles is 20 nm - 500 nm.

4. The electrically conductive ink according to claim 1, wherein The microplate diameter of the graphene is 10 nm - 1 μm.

5. The conductive ink according to claim 1, wherein The binder includes at least one of polyvinylpyrrolidone and polyethylene glycol; The dispersant includes sodium dodecyl sulfate; The stabilizer includes at least one of sodium citrate and polyvinyl alcohol.

6. The electrically conductive ink according to claim 1, characterized in that, The viscosity of the conductive ink is 5 - 50 mPa·s; the pH value of the conductive ink is 6.5 - 7.

5.

7. The preparation method of the conductive ink according to any one of claims 1 to 6, characterized in that, Including the following steps: Step 1: Disperse the silver nanoparticles and graphene in a part of the water to obtain a first dispersion; Step 2: Disperse the dispersant and stabilizer in the remaining water and alcohol solvents to obtain a second dispersion; Step 3: Add the first dispersion to the second dispersion and stir to obtain a third dispersion; Step 4: Add the binder to the third dispersion, stir and ultrasonicate in sequence to obtain the conductive ink.

8. The preparation method according to claim 7, wherein, In Step 1, the dispersion is carried out under ultrasonic conditions, the ultrasonic time is 30 min - 2 h, and the ultrasonic power is 100 - 200 W; In Step 2, the dispersion is carried out under stirring conditions, the stirring time is 20 min - 2 h, and the stirring speed is 500 - 1000 rpm.

9. The preparation method according to claim 7, characterized in that, In Step 3, the stirring time is 1 h, and the stirring speed is 500 - 1000 rpm; In Step 4, the stirring time is 30 min - 2 h, and the stirring speed is 500 - 1000 rpm.

10. Application of the conductive ink according to any one of claims 1 - 6 or the conductive ink prepared by the preparation method according to any one of claims 7 - 9 in a fountain pen, the application including: Filling the conductive ink into the fountain pen and writing to form a conductive imprint on the substrate surface.

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