Water-based environment-friendly graphene ink for screen printing and preparation method of water-based environment-friendly graphene ink

Abstract

The invention discloses water-based environment-friendly graphene ink for screen printing and a preparation method thereof, and belongs to the technical field of ink. Comprising the following raw materials in parts by weight: 80-90 parts of water-based acrylic resin emulsion, 12-18 parts of pigment, 4-12 parts of modified graphene, 3-8 parts of a coalescing agent, 0.3-0.9 part of a defoaming agent, 0.5-1.5 parts of a thickening agent and 15-25 parts of water. The ink prepared by the invention takes water as a main dispersion medium, and is environment-friendly; wherein the modified graphene is chemically modified and has good dispersity in the ink, so that the problem that the graphene is easy to agglomerate is solved, and the conductivity of the ink is greatly improved; an antibacterial group is also introduced into the modified graphene, so that the growth of bacteria can be inhibited; in conclusion, the prepared ink has excellent conductivity and certain antibacterial property, is water-based and environment-friendly, and has wide application prospects in the fields of flexible electronics, intelligent textiles and the like.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of ink, and particularly relates to a water-based environment-friendly graphene ink for screen printing and a preparation method thereof. BACKGROUND

[0002] Screen printing technology has been widely applied in many fields such as textile fabrics, packaging printing, electronic devices, decorative materials, etc. due to its advantages of high pattern definition, strong color expression, wide application of substrates, etc. The market demand in the fields of textile fabrics and flexible electronics is particularly prominent. With the improvement of people's environmental awareness and the increasingly stringent environmental regulations worldwide, the environmental pollution problem of traditional screen printing ink has gradually become a bottleneck for the development of the industry. At present, the mainstream screen printing ink on the market is mostly solvent-based system, which will release a large amount of volatile organic compounds (VOCs) during production, storage, printing and drying. Such substances not only cause serious pollution to the atmospheric environment and form environmental problems such as photochemical smog, but also cause chronic damage to the respiratory system and skin mucosa of the operators, and even may cause occupational diseases after long-term contact. At the same time, the solvent recovery of solvent-based ink is difficult and costly, and a large amount of unrecovered solvent is directly discharged, further aggravating resource waste and environmental burden.

[0003] In order to cope with environmental pressure, water-based ink has emerged as an important development direction. It uses water as the main dispersion medium, significantly reduces the emission of VOCs, has the safety characteristics of non-toxic, non-flammable and non-explosive, and improves the production environment. However, the existing water-based ink is mostly functional ink based on ordinary resin and traditional fillers such as carbon black, and it is difficult to completely match the comprehensive performance of solvent-based products. In addition, in emerging fields such as flexible electronics and smart textiles, special printing with conductive, antistatic or electromagnetic shielding functions is required, and conventional water-based ink is not up to the task.

[0004] In order to improve the conductivity of the ink, metal powders such as silver powder and copper powder are usually added, which have excellent conductivity, but are high in cost, high in density and easy to settle, and are easily oxidized when exposed to air for a long time, resulting in performance degradation. The ink filled with ordinary carbon black, although lower in cost, requires a high proportion of fillers to achieve the desired conductive effect, which will seriously affect the rheological property, printing suitability and mechanical property of the film layer of the ink, resulting in problems such as hard hand feeling and decreased fastness of the printed product.

[0005] In the prior art, graphene is used as a raw material to fill ink. Graphene material has a unique two-dimensional sheet structure, excellent electrical conductivity, excellent mechanical strength and a large specific surface area, and is considered as an ideal modifier for improving the comprehensive performance of water-based ink. However, there is a strong van der Waals force between the graphene layers, which is prone to agglomeration. In a water-based system, it is difficult to achieve uniform dispersion. If the dispersion is poor, the excellent electrical conductivity and mechanical properties cannot be achieved, and the agglomerated graphene particles will block the silk screen mesh, resulting in interruption of the printing process, pattern defects, and a significant reduction in production efficiency. Therefore, the above problems need to be solved to meet the higher demands in the ink technology field. SUMMARY

[0006] The present application aims to overcome the defects of the prior art and provide a water-based environmentally friendly graphene ink for screen printing and a preparation method thereof.

[0007] The object of the present application can be achieved by the following technical solutions. A water-based environmentally friendly graphene ink for screen printing comprises the following raw materials by weight: 80-90 parts of water-based acrylic resin emulsion, 12-18 parts of pigment, 4-12 parts of modified graphene, 3-8 parts of film-forming aid, 0.3-0.9 parts of defoaming agent, 0.5-1.5 parts of thickening agent, and 15-25 parts of water.

[0008] As a further technical solution, the film-forming aid is one of diethylene glycol butyl ether, dipropylene glycol butyl ether, propylene glycol methyl ether, and propylene glycol methyl ether acetate.

[0009] As a further technical solution, the defoaming agent is a silicone defoaming agent.

[0010] As a further technical solution, the water-based acrylic resin emulsion is prepared by the following steps: A flask equipped with a stirrer is charged with water, followed by methyl methacrylate, butyl acrylate, hydroxyethyl methacrylate, acrylic acid, and emulsifier. After stirring for 20-30 min, sodium bicarbonate and ammonium persulfate are added to the flask, and heated to 70-80℃. At this temperature, stirring is continued for 2-4 h, and the polymerization reaction is complete. Ammonia water (25% by mass) is added to adjust the pH of the emulsion to 7-8, and a water-based acrylic resin emulsion is obtained.

[0011] As a further technical solution, the raw materials are as follows by weight: 35-45 parts of methyl methacrylate, 20-30 parts of butyl acrylate, 3-6 parts of hydroxyethyl methacrylate, 7-15 parts of acrylic acid, 4-6 parts of emulsifier, 0.5-0.7 parts of sodium bicarbonate, 0.5-1.0 parts of ammonium persulfate, and 60-80 parts of water.

[0012] As a further technical solution, the emulsifier is a mixture of sodium dodecyl sulfate and alkyl phenol polyoxyethylene ether in a mass ratio of 1:1.

[0013] As a further technical solution, the modified graphene is prepared by the following steps: A1, in a dry three-necked flask, add polyethylene glycol (molecular weight 2000) and anhydrous dimethyl sulfoxide, heat to 50-60℃ under stirring, make polyethylene glycol completely dissolved, then stop heating, cool the reaction system to-20~-10℃ with ice salt bath, dilute oxalyl chloride with anhydrous dichloromethane, then add it into the flask through constant pressure dropping funnel, after dropping, continue stirring for 30-40min, make dimethyl sulfoxide fully activated by oxalyl chloride, at this time, slowly add triethylamine through constant pressure dropping funnel, after dropping, remove the ice salt bath, and continue stirring at room temperature for 2-3h, after reaction, get the product A after post-processing; A2, in a dry three-necked flask, add product A and deionized water, heat to 50-60℃ under stirring, make product A completely dissolved, continue to add 3-aminopropanesulfonic acid sodium, keep constant temperature condition, stir for 10-12h, after reaction, get product B after post-processing; A3, in a dry three-necked flask, add product B and deionized water, heat to 50-60℃ under stirring, make product B completely dissolved, continue to add 1,3-propanediamine, keep constant temperature condition, stir for 12-14h, after reaction, get product C after post-processing; A4, mix graphene oxide and N,N-dimethylformamide, after ultrasonic dispersion for 10-20min, add into a dry three-necked flask, start stirring, and add product C and dicyclohexyl carbodiimide in sequence, after adding the materials, heat to 50-55℃, keep constant temperature for 10-12h, after reaction, get modified graphene after post-processing.

[0014] As a further technical solution, the amount ratio of polyethylene glycol, anhydrous dimethyl sulfoxide, oxalyl chloride, anhydrous dichloromethane and triethylamine in step A1 is 200g:400mL:26.1-27.3g:50mL:48.2-51.1g.

[0015] As a further technical solution, the amount ratio of product A, deionized water and 3-aminopropanesulfonic acid sodium in step A2 is 210-220g:400mL:16.1g.

[0016] As a further technical solution, the amount ratio of product B, deionized water and 3-aminopropanesulfonic acid sodium in step A3 is 224.5g:400mL:8.1-8.7g.

[0017] As a further technical solution, the ratio of the amount of graphene oxide, N,N-dimethylformamide, product C, dicyclohexyl carbodiimide in step A4 is 20g:100mL:8.1-9.9g:2.2-2.9g.

[0018] In the process of preparing the modified graphene, the reaction formulas of steps A1, A2 and A3 are as follows: As can be seen from the above reaction formula, in order to ensure that the obtained product C is the same as the reaction formula, it is necessary to strictly control the amount of raw materials in each step. In step A1, the molar ratio of polyethylene glycol to oxalyl chloride should be controlled to be close to 1:2 and the latter should be excessive. In step A2, product A condenses with sodium 3-aminopropanesulfonate to form an imine group, and the molar ratio of the two should be controlled to be close to 1:1 and the former should be excessive. Step A3 is the same as step A2, and the molar ratio of product B to 1,3-propanediamine should be controlled to be close to 1:1 and the latter should be excessive. Finally, the product C containing amino groups is obtained, which reacts with the carboxyl groups on the surface of graphene to prepare modified graphene.

[0019] As can be seen from the above reaction formula, by modifying graphene with product C, the introduced polyether chain has strong hydrophilicity, which can greatly improve the surface hydrophilicity of graphene oxide, reduce the agglomeration phenomenon, and make it easier to disperse in water-based ink, and better play the performance of graphene. In addition, the introduced sulfonate group further improves the hydrophilicity of graphene. Finally, the introduced Schiff base structure belongs to an antibacterial structure, which can interact with bacterial proteins and enzymes, block the synthesis of bacterial nucleotides and amino acids, and to some extent, enhance the antibacterial property of the ink.

[0020] The application also provides a preparation method of a water-based environment-friendly graphene ink for screen printing, which comprises the following steps: B1, adding the modified graphene into water, and ultrasonic treating for 10-30min to obtain a graphene dispersion liquid; B2, adding the water-based acrylic resin emulsion and the film-forming aid into a mixing machine, continuously stirring for 30-40min under low-speed stirring, then adding the graphene dispersion liquid, increasing the stirring speed, and continuously stirring for 10-20min under high-speed stirring to obtain a mixture; B3, transferring the mixture into a grinder for grinding, and then sequentially adding the ground slurry, the defoaming agent, the pigment and the thickening agent into the mixing machine, stirring for 40-60min under low-speed stirring, and then standing for 1-2h to obtain the water-based environment-friendly graphene ink for screen printing.

[0021] As a further technical solution, the rotation speed of the low-speed stirring is 300-500rpm.

[0022] As a further technical solution, the rotation speed of the high-speed stirring is 1200-1500 rpm.

[0023] Advantages of the present application: 1. The prepared ink uses water as the main dispersion medium, significantly reduces the emission of volatile organic compounds, and is environmentally friendly; 2. By chemically modifying graphene, hydrophilic polyether chains and sulfonate groups are introduced, which significantly improves the dispersibility of graphene in the ink, overcomes the problem of graphene aggregation, and greatly improves the conductivity of the ink; 3. The modified graphene also introduces antibacterial groups, which can inhibit bacterial growth and improve the hygiene requirements of the ink in textile applications; In summary, the prepared ink has excellent conductivity and certain antibacterial properties, is water-based and environmentally friendly, and has broad application prospects in the fields of flexible electronics, smart textiles, etc. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0025] Embodiment one Preparation of water-based acrylic resin emulsion: In a flask equipped with a stirrer, 60 g of water was added, followed by 35 g of methyl methacrylate, 20 g of butyl acrylate, 3 g of hydroxyethyl methacrylate, 7 g of acrylic acid and 4 g of emulsifier (obtained by compounding 2 g of sodium dodecyl sulfate and 2 g of alkylphenol polyoxyethylene ether), stirring for 20 min, then adding 0.5 g of sodium bicarbonate and 0.5 g of ammonium persulfate to the flask, and heating to 70℃. At this temperature, continue stirring for 2 h, the polymerization reaction is completed, add ammonia water (25% mass fraction) to adjust the pH of the emulsion to 7, and obtain the water-based acrylic resin emulsion.

[0026] Embodiment two Preparation of water-based acrylic resin emulsion: In a flask equipped with a stirrer, 80 g of water was added, followed by 45 g of methyl methacrylate, 30 g of butyl acrylate, 6 g of hydroxyethyl methacrylate, 15 g of acrylic acid and 6 g of emulsifier (obtained by compounding 3 g of sodium dodecyl sulfate and 3 g of alkylphenol polyoxyethylene ether), after stirring for 30 min, 0.7 g of sodium bicarbonate and 1.0 g of ammonium persulfate were added to the flask, and heated to 80℃, at this temperature, continue to stir for 4h, the polymerization reaction is completed, add ammonia water (mass fraction 25%) to adjust the pH of the emulsion to 8, to obtain an aqueous acrylic resin emulsion.

[0027] Example three Preparation of modified graphene: A1, in a dry three-necked flask, add 200 g of polyethylene glycol (molecular weight 2000) and 400 mL of anhydrous dimethyl sulfoxide, heated to 50℃ under stirring, the polyethylene glycol is completely dissolved, then stop heating, the reaction system is cooled to-20℃ with ice salt bath, 26.1 g of oxalyl chloride is diluted with 50 mL of anhydrous dichloromethane, then added to the flask through a constant pressure dropping funnel, after dropping, continue to stir for 30 min, so that dimethyl sulfoxide is fully activated by oxalyl chloride, at this time, slowly add 48.2 g of triethylamine through a constant pressure dropping funnel, after dropping, remove the ice salt bath, and continue to stir the reaction at room temperature for 2h, the reaction is completed, a small amount of methanol is slowly added to quench the residual activated reagent, then transferred to pre-cooled ether, the solid is precipitated, filtered, the obtained solid is dissolved in pure water, dialyzed using dialysis bag, dried to obtain product A; A2, in a dry three-necked flask, add 210 g of product A and 400 mL of deionized water, heated to 50℃ under stirring, the product A is completely dissolved, continue to add 16.1 g of 3-aminopropanesulfonic acid sodium, keep constant temperature condition, stir for 10h, the reaction is completed, dialysis, freeze-drying to obtain product B; A3, in a dry three-necked flask, add 224.5 g of product B and 400 mL of deionized water, heated to 50℃ under stirring, the product B is completely dissolved, continue to add 8.1 g of 1,3-propanediamine, keep constant temperature condition, stir for 12h, the reaction is completed, dialysis, freeze-drying to obtain product C; A4, mix 20 g of graphene oxide and 100 mL of N,N-dimethylformamide, ultrasonic dispersion for 10 min, then add to a dry three-necked flask, start stirring, and add 8.1 g of product C and 2.2 g of dicyclohexyl carbodiimide in turn, after adding the materials, heat to 50℃, constant temperature reaction for 10h, the reaction is completed, high-speed centrifugation, the precipitate is washed with ethanol and water for several times, freeze-drying to obtain modified graphene; A method for preparing a water-based environment-friendly graphene ink for screen printing, comprising the following steps: B1, 4 g modified graphene was added into 15 g water, and ultrasonic treatment was performed for 10 min to obtain a graphene dispersion liquid; B2, 80 g of the aqueous acrylic resin emulsion prepared in Example 1 and 3 g of diethylene glycol butyl ether were added into a mixer, and low-speed stirring was performed at a rotation speed of 300 rpm for 30 min, then the graphene dispersion liquid was added, and high-speed stirring was performed at a rotation speed of 1200 rpm for 10 min to obtain a mixture; B3, the mixture was transferred into a grinder for grinding, and 0.3 g of defoaming agent (BYK-035), 12 g of phthalocyanine blue and 0.5 g of hydroxyethyl cellulose were sequentially added into the mixer, low-speed stirring was performed for 40 min, and then standing and aging was performed for 1 h to obtain an aqueous environment-friendly graphene ink for screen printing.

[0028] Example Four Preparation of modified graphene: A1, 200 g of polyethylene glycol (molecular weight 2000) and 400 mL of anhydrous dimethyl sulfoxide were added into a dry three-necked flask, and heating was performed under stirring to 60 ℃ until the polyethylene glycol was completely dissolved, then heating was stopped, the reaction system was cooled to -10 ℃ with an ice-salt bath, 27.3 g of oxalyl chloride was diluted with 50 mL of anhydrous dichloromethane, and then was added dropwise into the flask through a constant-pressure dropping funnel, after the dropping was completed, stirring was continued for 40 min to allow the dimethyl sulfoxide to be fully activated by the oxalyl chloride, at this time, 51.1 g of triethylamine was slowly added dropwise through a constant-pressure dropping funnel, after the dropping was completed, the ice-salt bath was removed, and the reaction was continued to stir at room temperature for 3 h, after the reaction was completed, a small amount of methanol was slowly added to quench the residual activated reagent, then it was transferred into pre-cooled ether to precipitate a solid, which was filtered, the obtained solid was dissolved in pure water again, and dialysis was performed using a dialysis bag, and then drying was performed to obtain product A; A2, 220 g of product A and 400 mL of deionized water were added into a dry three-necked flask, and heating was performed under stirring to 60 ℃ until the product A was completely dissolved, then 16.1 g of 3-aminopropanesulfonic acid sodium was continuously added, and the reaction was stirred for 12 h under constant temperature conditions, after the reaction was completed, dialysis was performed, and freeze-drying was performed to obtain product B; A3, 224.5 g of product B and 400 mL of deionized water were added into a dry three-necked flask, and heating was performed under stirring to 60 ℃ until the product B was completely dissolved, then 8.7 g of 1,3-propanediamine was continuously added, and the reaction was stirred for 14 h under constant temperature conditions, after the reaction was completed, dialysis was performed, and freeze-drying was performed to obtain product C; A4. Mix 20g of graphene oxide and 100mL of N,N-dimethylformamide, sonicate for 20min, then add to a dry three-necked flask, start stirring, and add 9.9g of product C and 2.9g of dicyclohexylcarbodiimide in sequence. After the materials are added, heat to 55℃ and react at a constant temperature for 12h. After the reaction is complete, centrifuge at high speed, wash the precipitate with ethanol and water several times in sequence, and freeze dry to obtain modified graphene. A method for preparing water-based environmentally friendly graphene ink for screen printing includes the following steps: B1. Add 8g of modified graphene to 20g of water and sonicate for 20min to obtain a graphene dispersion. B2. Add 85g of the aqueous acrylic resin emulsion prepared in Example 2 and 6g of dipropylene glycol butyl ether to a mixer and stir at a low speed of 400 rpm for 40 min. Then add the graphene dispersion and stir at a high speed of 1300 rpm for 20 min to obtain the mixture. B3. Transfer the mixture to a grinder for grinding. Add the ground slurry, 0.6g of defoamer (BYK-035), 16g of phthalocyanine green and 1.0g of hydroxyethyl cellulose to the mixer in sequence, stir at low speed for 50 minutes, and then let it stand for 2 hours to obtain water-based environmentally friendly graphene ink for screen printing.

[0029] Example 5 The only difference between this embodiment and Embodiment 4 is that, in this embodiment, a method for preparing a water-based environmentally friendly graphene ink for screen printing includes the following steps: B1. Add 12g of modified graphene to 25g of water and sonicate for 30min to obtain a graphene dispersion. B2. Add 90g of the aqueous acrylic resin emulsion prepared in Example 2 and 8g of dipropylene glycol butyl ether to a mixer and stir at a low speed of 500 rpm for 40 min. Then add the graphene dispersion and stir at a high speed of 1500 rpm for 20 min to obtain the mixture. B3. Transfer the mixture to a grinder for grinding. Add the ground slurry, 0.9g of defoamer (BYK-035), 18g of phthalocyanine green and 1.5g of hydroxyethyl cellulose to the mixer in sequence, stir at low speed for 60 minutes, and then let it stand for 2 hours to obtain water-based environmentally friendly graphene ink for screen printing.

[0030] Comparative Example 1 The only difference between this comparative example and Example 5 is that in this comparative example, an equal amount of unmodified graphene oxide was used to replace the modified graphene to obtain the ink.

[0031] Comparative Example 2 The difference between the present comparative example and Comparative Example 1 is that 2 g of dodecyl phenol polyoxyethylene ether is additionally added as a raw material for dispersing graphene to prepare the ink.

[0032] The following performance tests were conducted on Examples 3, 4, 5, Comparative Examples 1 and 2: The square resistance of the sample (coating thickness 15 μm) was measured by a four-probe resistance meter; The sample was stored in a sealed container at 40℃ for 7 days according to GB / T 6753.3-1986 standard, and whether delamination, precipitation or caking occurred was observed; The antibacterial rate of the sample against E. coli and S. aureus was measured according to GB / T 21866-2008 standard; The results are shown in Table 1: Table 1 As shown in Table 1, the ink prepared in the examples of the present application has better conductivity and antibacterial property than the comparative examples, and does not agglomerate during long-term storage, thus the present application has a broad application prospect in the fields of flexible electronics, smart textiles and the like.

[0033] It is apparent for those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, and the scope of the present application should be defined by the appended claims rather than the above description, and all changes coming within the meaning and range of equivalency of the claims are intended to be embraced therein.

Claims

1. An aqueous eco-friendly graphene ink for screen printing, characterized by, The raw materials include the following weight parts: 80-90 parts of water-based acrylic resin emulsion, 12-18 parts of pigment, 4-12 parts of modified graphene, 3-8 parts of film-forming aid, 0.3-0.9 parts of defoaming agent, 0.5-1.5 parts of thickening agent, and 15-25 parts of water.

2. The water-based environment-friendly graphene ink for screen printing according to claim 1, characterized in that, The modified graphene is prepared by the following steps: A1, in a flask, add polyethylene glycol and anhydrous dimethyl sulfoxide, heat to 50-60℃ under stirring, make polyethylene glycol completely dissolved, stop heating, cool to -20~-10℃, dilute oxalyl chloride with anhydrous dichloromethane, drop into the flask, stir for 30-40min, then drop in triethylamine, after dropping, stir at room temperature for 2-3h, the reaction is completed, and the product A is obtained; A2, in a flask, add product A and deionized water, heat to 50-60℃ under stirring, make product A completely dissolved, continue to add 3-aminopropanesulfonic acid sodium, stir at constant temperature for 10-12h, the reaction is completed, and product B is obtained; A3, in a dry three-necked flask, add product B and deionized water, heat to 50-60℃ under stirring, make product B completely dissolved, continue to add 1,3-propanediamine, stir at constant temperature for 12-14h, the reaction is completed, and product C is obtained; A4, mix graphene oxide and N,N-dimethylformamide, ultrasonic dispersion for 10-20min, then add into the flask, start stirring, and then add product C and dicyclohexyl carbodiimide in sequence, after adding the materials, react at 50-55℃ for 10-12h, the reaction is completed, and the modified graphene is obtained.

3. The water-based environment-friendly graphene ink for screen printing according to claim 2, characterized in that, The ratio of the amount of polyethylene glycol, anhydrous dimethyl sulfoxide, oxalyl chloride, anhydrous dichloromethane, and triethylamine in step A1 is 200g:400mL:26.1-27.3g:50mL:48.2-51.1g.

4. The water-based environment-friendly graphene ink for screen printing according to claim 2, characterized in that, The ratio of the amount of product A, deionized water, and 3-aminopropanesulfonic acid sodium in step A2 is 210-220g:400mL:16.1g.

5. The water-based environment-friendly graphene ink for screen printing according to claim 2, characterized in that, The ratio of the amount of product B, deionized water, and 3-aminopropanesulfonic acid sodium in step A3 is 224.5g:400mL:8.1-8.7g.

6. The water-based environment-friendly graphene ink for screen printing according to claim 2, characterized in that, The ratio of the amount of graphene oxide, N,N-dimethylformamide, product C, and dicyclohexyl carbodiimide in step A4 is 20g:100mL:8.1-9.9g:2.2-2.9g.

7. The water-based environment-friendly graphene ink for screen printing according to claim 1, characterized in that, The water-based acrylic resin emulsion is prepared by the following steps: In a flask, add water, then add methyl methacrylate, butyl acrylate, hydroxyethyl methacrylate, and acrylic acid in sequence, stir for 20-30min, then add sodium bicarbonate and ammonium persulfate into the flask, heat to 70-80℃, continue to stir for 2-4h, the polymerization reaction is completed, add ammonia water to adjust the pH of the emulsion to 7-8, and the water-based acrylic resin emulsion is obtained.

8. The water-based environment-friendly graphene ink for screen printing according to claim 7, characterized in that, The amount of each raw material is as follows: 35-45 parts of methyl methacrylate, 20-30 parts of butyl acrylate, 3-6 parts of hydroxyethyl methacrylate, 7-15 parts of acrylic acid, 4-6 parts of emulsifier, 0.5-0.7 parts of sodium bicarbonate, 0.5-1.0 parts of ammonium persulfate, and 60-80 parts of water. 9.The water-based environment-friendly graphene ink for screen printing according to claim 7, characterized in that, The emulsifier is a mixture of sodium dodecyl sulfate and alkyl phenol polyoxyethylene ether in a mass ratio of 1:

1.

10. A method for preparing a water-based environment-friendly graphene ink for screen printing, for preparing the water-based environment-friendly graphene ink for screen printing according to any one of claims 1-9, characterized in that, The method comprises the following steps: B1, adding modified graphene into water, ultrasonic treatment for 10-30 min to obtain graphene dispersion liquid; B2, adding water-based acrylic resin emulsion and film-forming aid into a mixing machine, continuously stirring for 30-40 min under low-speed stirring, then adding graphene dispersion liquid, continuously stirring for 10-20 min under high-speed stirring to obtain mixed material; B3, transferring the mixed material into a grinder for grinding, then adding the ground slurry, defoaming agent, pigment and thickening agent into the mixing machine in sequence, stirring for 40-60 min under low-speed stirring, and then standing for 1-2 h to obtain water-based environment-friendly graphene ink for screen printing.

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