A kind of conductive paste specially used for coating and its preparation method

Abstract

The present invention discloses a conductive slurry for coating and a preparation method thereof, the method comprising: step 1, weighing each raw material; step 2, mixing graphene material and conductive carbon black, adding a first dispersant, and stirring evenly; step 3, heating water, adding a second dispersant, stirring evenly, adding the mixture to an aqueous solution, and stirring and mixing evenly; step 4, adjusting the pH value of the mixed solution to neutrality with a regulator; step 5, adding an adhesive to the mixed solution, continuing to stir evenly, and obtaining a mixed slurry; step 6, adjusting the viscosity of the mixed slurry with a thickener; step 7, coating the slurry on a cloth and drying it; step 8, testing the conductivity of the coated cloth and the wear-resistant effect of the conductive coating. The present invention also provides a conductive slurry for coating prepared by the method. The present invention prepares a conductive carbon slurry for coating process, the coating has strong fastness, is not easy to fall off, has good conductive effect, and can meet the corresponding conductive requirements.

Description

Technical Field

[0001] The present invention relates to a conductive paste for coating and a preparation method thereof, and in particular to a graphene conductive paste dedicated for coating and a preparation method thereof. Background Art

[0002] Conductive paste is a liquid mixture containing conductive materials, which is added to other non-conductive liquids or coated on the surface of non-conductive substrates to achieve antistatic or conductive effects. Conductive paste can be divided into carbon paste (graphite conductor), metal paste (gold powder, silver powder, copper powder, silver-copper alloy), and modified ceramic paste according to the different fillers in it. According to the classification of curing conditions, it can be divided into thermal curing, UV curing, etc. In terms of performance comparison, precious metal fillers have the best conductivity, followed by carbon paste. However, the price of gold is too high, and the oxidation resistance of copper powder is not good. Silver powder and silver-copper powder are more balanced in price and performance. The wear resistance of carbon paste is better than that of silver paste.

[0003] Conductive paste is a key material for electronic component packaging, electrodes and interconnection, mainly including two categories: fired conductive paste and curing conductive adhesive (conductive ink). Fired conductive paste is mainly used in industries such as solar cells and is used as electrodes after sintering. Curing conductive ink is widely used in industries such as printed circuits and electronic packaging.

[0004] At present, there are many domestic manufacturers of graphene conductive slurry, but the product quality is generally low. Specifically, the quality of graphene raw materials is poor, the dispersion of graphene is poor, and the ratio of carbon materials is not good. It is difficult to form an ideal three-dimensional conductive network, and it has no significant effect on improving the performance of lithium batteries.

[0005] Graphene is a single-layer carbon atom material peeled off from graphite. It is a single-layer two-dimensional honeycomb lattice structure formed by tightly stacking carbon atoms. It is the thinnest, hardest and most conductive material known to mankind. It has good conductivity. The speed of electrons in graphene reaches 1 / 300 of the speed of light. Its conductivity exceeds that of any traditional conductive material. Its chemical properties are similar to those of graphite surface. It can adsorb and desorb various atoms and molecules, and has the ability to resist strong acids and alkalis. Summary of the invention

[0006] The purpose of the present invention is to provide a graphene composite conductive slurry and a preparation method thereof, which can solve the existing problems and obtain a conductive carbon slurry for a coating process. The coating has strong fastness, is not easy to fall off, has good conductive effect, and can meet corresponding conductive requirements.

[0007] In order to achieve the above-mentioned purpose, the present invention provides a method for preparing a special conductive slurry for coating, wherein the method comprises: step 1, weighing each raw material in proportion; the raw materials are graphene material, conductive carbon black, a first dispersant, a second dispersant, a regulator, a thickener, an adhesive, and water; step 2, mixing the graphene material with the conductive carbon black, adding the first dispersant, and stirring evenly; step 3, heating the water, adding the second dispersant, stirring evenly, and then adding the mixture obtained in step 2 to the aqueous solution, stirring and mixing evenly; step 4, adjusting the pH value of the mixed solution obtained in step 3 to neutral with a regulator; step 5, adding an adhesive to the mixed solution, continuing to stir evenly to obtain a mixed slurry; step 6, adjusting the viscosity of the mixed slurry with a thickener; step 7, coating the slurry obtained in step 6 on a cloth and drying it; step 8, testing the conductivity of the coated cloth obtained in step 7 and the wear resistance of the conductive coating.

[0008] Furthermore, in the step 1, the raw materials are composed of the following components by mass percentage: 2% to 10% graphene powder, 10% to 20% conductive carbon black powder, 1% to 5% first dispersant, 1% to 5% second dispersant, 0.1% to 1% pH adjuster, 0.5% to 2% thickener, 20% to 35% aqueous binder, and 30% to 50% mineral water.

[0009] Furthermore, the first dispersant is any one or more of polyethylene glycol, polyvinyl alcohol, polyvinyl pyrrolidone, sodium lignin sulfonate, and sodium hexadecylbenzene sulfonate.

[0010] Furthermore, the second dispersant is KD1 or BYK-2150.

[0011] Furthermore, the pH regulator is one or more of ammonia water, sodium bicarbonate, and hydrochloric acid.

[0012] Furthermore, the water-based adhesive is any one or more of styrene-butadiene rubber emulsion, water-based polyacrylate emulsion, and polytetrafluoroethylene emulsion.

[0013] Furthermore, the thickener is any one or more of hydroxyethyl cellulose, sodium hydroxymethyl cellulose, and sodium alginate.

[0014] Furthermore, in the step 2, the graphene powder and the conductive carbon black powder are mixed, a first dispersant is added, and the mixture is stirred thoroughly for 1 hour by a high-speed stirrer to be uniformly mixed.

[0015] Furthermore, in step 3, water is heated to 40-60°C.

[0016] The present invention also provides a conductive paste for coating prepared by the above method, wherein the conductive paste is coated on a cloth, and the conductivity of the obtained coated cloth is greater than or equal to 10 3 .

[0017] The conductive paste for coating provided by the present invention and the preparation method thereof have the following advantages:

[0018] The present invention develops a special conductive paste for coating, which can solve the selection of conductive materials and optimization of additives in the conductive paste. The conductive paste uses carbon material as the conductive material, which is low in cost and easy to produce. The conductive carbon material can be firmly adhered to the surface of chemical fiber or cloth to form a stable conductive coating.

[0019] The production method is simple and easy, the conductive slurry has low cost, the obtained slurry has excellent conductive performance, and the coating after coating and drying has strong fastness and is not easy to fall off. DETAILED DESCRIPTION

[0020] The specific embodiments of the present invention are further described below.

[0021] The present invention provides a method for preparing a special conductive slurry for coating, which comprises: step 1, weighing each raw material in proportion; the raw materials are graphene material, conductive carbon black, a first dispersant, a second dispersant, a regulator, a thickener, an adhesive, and water; step 2, mixing the graphene material and the conductive carbon black, adding the first dispersant, and stirring evenly; step 3, heating the water, adding the second dispersant, setting the speed of the stirrer, stirring evenly, and then adding the mixture powder obtained in step 2 to the aqueous solution, stirring and mixing evenly; step 4, adjusting the pH value of the mixed solution system obtained in step 3 to neutral with a regulator; step 5, adding an adhesive to the mixed solution while stirring, and continuing to stir evenly to obtain a mixed slurry; step 6, adjusting the viscosity of the mixed slurry with a thickener as needed to make the viscosity moderate to obtain the desired slurry; step 7, coating the slurry obtained in step 6 on the cloth, setting the drying temperature, and drying with a drying device; step 8, testing the conductivity of the coated cloth obtained in step 7 and the wear resistance of the conductive coating. The conductivity was considered acceptable when it was 10 to the power of 3.

[0022] Preferably, the raw materials in step 1 are composed of the following components by mass percentage: 2% to 10% graphene powder, 10 to 20% conductive carbon black powder, 1 to 5% first dispersant, 1 to 5% second dispersant, 0.1 to 1% pH adjuster, 0.5 to 2% thickener, 20% to 35% aqueous binder, and 30% to 50% mineral water.

[0023] The first dispersant is any one or more of polyethylene glycol, polyvinyl alcohol, polyvinyl pyrrolidone, sodium lignin sulfonate, and sodium hexadecylbenzene sulfonate.

[0024] The second dispersant is KD1 or BYK-2150. KD1 is Croda's Hypermer KD1 dispersant. BYK-2150 is BYK-2150 dispersant from BYK Disper.

[0025] The pH regulator is one or more of ammonia water, sodium bicarbonate, and hydrochloric acid, and is selected according to the pH value of the mixed solution system.

[0026] The water-based adhesive is any one or more of styrene-butadiene rubber emulsion, water-based polyacrylate emulsion and polytetrafluoroethylene emulsion.

[0027] The thickener is any one or more of hydroxyethyl cellulose, sodium hydroxymethyl cellulose and sodium alginate.

[0028] In step 2, the graphene powder and the conductive carbon black powder are mixed, the first dispersant is added, and the mixture is stirred thoroughly for 1 hour by a high-speed stirrer to be uniformly mixed.

[0029] In step 3, water is heated to 40-60°C.

[0030] The equipment and other process conditions used in the present invention are known to those skilled in the art.

[0031] The present invention also provides a special conductive paste for coating prepared by the method, wherein the conductive paste is coated on a cloth, and the conductivity of the obtained coated cloth is greater than or equal to 10 3 .

[0032] The conductive paste for coating provided by the present invention and its preparation method are further described below in conjunction with the embodiments.

[0033] Example 1

[0034] A method for preparing a special conductive slurry for coating, comprising:

[0035] Step 1, weighing each raw material in proportion; the raw materials include graphene material, conductive carbon black, a first dispersant, a second dispersant, a regulator, a thickener, an adhesive, and water.

[0036] Preferably, the raw materials are composed of the following components by mass percentage: 2% graphene powder, 10% conductive carbon black powder, 1% first dispersant, 1% second dispersant, 0.5% pH adjuster, 0.5% thickener, 35% aqueous binder, and 50% mineral water.

[0037] The first dispersant is polyethylene glycol and polyvinyl alcohol. The second dispersant is KD1. The pH regulator is ammonia water. The water-based adhesive is styrene-butadiene rubber latex. The thickener is hydroxyethyl cellulose.

[0038] Step 2: mix the graphene material and the conductive carbon black, add the first dispersant, and stir evenly.

[0039] Preferably, the graphene powder and the conductive carbon black powder are mixed, a first dispersant is added, and the mixture is stirred thoroughly for 1 hour by a high-speed stirrer to be uniformly mixed.

[0040] Step 3, heat the water to 40°C, add the second dispersant, stir evenly, then add the mixture obtained in step 2 to the aqueous solution, stir and mix evenly.

[0041] Step 4, adjusting the pH value of the mixed solution obtained in step 3 to neutral with a regulator.

[0042] Step 5, adding a binder to the mixed solution, and continuing to stir evenly to obtain a mixed slurry.

[0043] Step 6, adjusting the viscosity of the mixed slurry with a thickener.

[0044] Step 7, coating the slurry obtained in step 6 on the cloth and drying it.

[0045] Step 8, testing the conductivity of the coated cloth obtained in step 7 and the wear resistance of the conductive coating.

[0046] This embodiment also provides a special conductive paste for coating prepared by the method.

[0047] Example 2

[0048] A method for preparing a special conductive slurry for coating, comprising:

[0049] Step 1, weighing each raw material in proportion; the raw materials include graphene material, conductive carbon black, a first dispersant, a second dispersant, a regulator, a thickener, an adhesive, and water.

[0050] Preferably, the raw materials are composed of the following components by mass percentage: 4% graphene powder, 16% conductive carbon black powder, 3% first dispersant, 3% second dispersant, 0.4% pH adjuster, 1% thickener, 30% aqueous binder, and 42.6% mineral water.

[0051] The first dispersant is polyvinyl pyrrolidone and the second dispersant is BYK-2150.

[0052] The pH regulator is sodium bicarbonate. The water-based adhesive is water-based polyacrylate emulsion. The thickener is sodium hydroxymethylcellulose.

[0053] Step 2: mix the graphene material and the conductive carbon black, add the first dispersant, and stir evenly.

[0054] Preferably, the graphene powder and the conductive carbon black powder are mixed, a first dispersant is added, and the mixture is stirred thoroughly for 1 hour by a high-speed stirrer to be uniformly mixed.

[0055] Step 3, heat the water to 50°C, add the second dispersant, stir evenly, then add the mixture obtained in step 2 to the aqueous solution, stir and mix evenly.

[0056] Step 4, adjusting the pH value of the mixed solution obtained in step 3 to neutral with a regulator.

[0057] Step 5, adding a binder to the mixed solution, and continuing to stir evenly to obtain a mixed slurry.

[0058] Step 6, adjusting the viscosity of the mixed slurry with a thickener.

[0059] Step 7, coating the slurry obtained in step 6 on the cloth and drying it.

[0060] Step 8, testing the conductivity of the coated cloth obtained in step 7 and the wear resistance of the conductive coating.

[0061] This embodiment also provides a special conductive paste for coating prepared by the method.

[0062] Example 3

[0063] A method for preparing a special conductive slurry for coating, comprising:

[0064] Step 1, weighing each raw material in proportion; the raw materials include graphene material, conductive carbon black, a first dispersant, a second dispersant, a regulator, a thickener, an adhesive, and water.

[0065] Preferably, the raw materials are composed of the following components by mass percentage: 6% graphene powder, 12% conductive carbon black powder, 4% first dispersant, 5% second dispersant, 0.2% pH adjuster, 1.8% thickener, 26% aqueous binder, and 45% mineral water.

[0066] The first dispersant is sodium lignin sulfonate. The second dispersant is KD1.

[0067] The pH adjuster is one of ammonia water, sodium bicarbonate and hydrochloric acid.

[0068] The water-based adhesive is polytetrafluoroethylene emulsion and the thickener is sodium alginate.

[0069] Step 2: mix the graphene material and the conductive carbon black, add the first dispersant, and stir evenly.

[0070] Preferably, the graphene powder and the conductive carbon black powder are mixed, a first dispersant is added, and the mixture is stirred thoroughly for 1 hour by a high-speed stirrer to be uniformly mixed.

[0071] Step 3, heat the water to 50°C, add the second dispersant, stir evenly, then add the mixture obtained in step 2 to the aqueous solution, stir and mix evenly.

[0072] Step 4, adjusting the pH value of the mixed solution obtained in step 3 to neutral with a regulator.

[0073] Step 5, adding a binder to the mixed solution, and continuing to stir evenly to obtain a mixed slurry.

[0074] Step 6, adjusting the viscosity of the mixed slurry with a thickener.

[0075] Step 7, coating the slurry obtained in step 6 on the cloth and drying it.

[0076] Step 8, testing the conductivity of the coated cloth obtained in step 7 and the wear resistance of the conductive coating.

[0077] This embodiment also provides a special conductive paste for coating prepared by the method.

[0078] Example 4

[0079] A method for preparing a special conductive slurry for coating, comprising:

[0080] Step 1, weighing each raw material in proportion; the raw materials include graphene material, conductive carbon black, a first dispersant, a second dispersant, a regulator, a thickener, an adhesive, and water.

[0081] Preferably, the raw materials are composed of the following components by mass percentage: 8% graphene powder, 15% conductive carbon black powder, 5% first dispersant, 2% second dispersant, 1% pH adjuster, 2% thickener, 27% aqueous binder, and 40% mineral water.

[0082] The first dispersant is sodium hexadecylbenzene sulfonate and the second dispersant is BYK-2150.

[0083] The pH adjuster is a variety of ammonia water, sodium bicarbonate, and hydrochloric acid.

[0084] The water-based adhesive is any one of styrene-butadiene rubber emulsion, water-based polyacrylate emulsion and polytetrafluoroethylene emulsion.

[0085] The thickener is any one of hydroxyethyl cellulose, sodium hydroxymethyl cellulose and sodium alginate.

[0086] Step 2: mix the graphene material and the conductive carbon black, add the first dispersant, and stir evenly.

[0087] Preferably, the graphene powder and the conductive carbon black powder are mixed, a first dispersant is added, and the mixture is stirred thoroughly for 1 hour by a high-speed stirrer to be uniformly mixed.

[0088] Step 3, heat the water to 50°C, add the second dispersant, stir evenly, then add the mixture obtained in step 2 to the aqueous solution, stir and mix evenly.

[0089] Step 4, adjusting the pH value of the mixed solution obtained in step 3 to neutral with a regulator.

[0090] Step 5, adding a binder to the mixed solution, and continuing to stir evenly to obtain a mixed slurry.

[0091] Step 6, adjusting the viscosity of the mixed slurry with a thickener.

[0092] Step 7, coating the slurry obtained in step 6 on the cloth and drying it.

[0093] Step 8, testing the conductivity of the coated cloth obtained in step 7 and the wear resistance of the conductive coating.

[0094] This embodiment also provides a special conductive paste for coating prepared by the method.

[0095] Example 5

[0096] A method for preparing a special conductive slurry for coating, comprising:

[0097] Step 1, weighing each raw material in proportion; the raw materials include graphene material, conductive carbon black, a first dispersant, a second dispersant, a regulator, a thickener, an adhesive, and water.

[0098] Preferably, the raw materials are composed of the following components by mass percentage: 10% graphene powder, 20% conductive carbon black powder, 2% first dispersant, 2.3% second dispersant, 0.1% pH adjuster, 0.6% thickener, 35% aqueous binder, and 30% mineral water.

[0099] The first dispersant is any one of polyethylene glycol, polyvinyl alcohol, polyvinyl pyrrolidone, sodium lignin sulfonate, and sodium hexadecylbenzene sulfonate.

[0100] The second dispersant is KD1 or BYK-2150.

[0101] The pH adjuster is a variety of ammonia water, sodium bicarbonate, and hydrochloric acid.

[0102] The water-based adhesive is any one of styrene-butadiene rubber emulsion, water-based polyacrylate emulsion and polytetrafluoroethylene emulsion.

[0103] The thickener is any one of hydroxyethyl cellulose, sodium hydroxymethyl cellulose and sodium alginate.

[0104] Step 2: mix the graphene material and the conductive carbon black, add the first dispersant, and stir evenly.

[0105] Preferably, the graphene powder and the conductive carbon black powder are mixed, a first dispersant is added, and the mixture is stirred thoroughly for 1 hour by a high-speed stirrer to be uniformly mixed.

[0106] Step 3, heat the water to 60° C., add the second dispersant, stir evenly, and then add the mixture obtained in step 2 to the aqueous solution, stir and mix evenly.

[0107] Step 4, adjusting the pH value of the mixed solution obtained in step 3 to neutral with a regulator.

[0108] Step 5, adding a binder to the mixed solution, and continuing to stir evenly to obtain a mixed slurry.

[0109] Step 6, adjusting the viscosity of the mixed slurry with a thickener.

[0110] Step 7, coating the slurry obtained in step 6 on the cloth and drying it.

[0111] Step 8, testing the conductivity of the coated cloth obtained in step 7 and the wear resistance of the conductive coating.

[0112] This embodiment also provides a special conductive paste for coating prepared by the method.

[0113] The conductive paste prepared in each embodiment of the present invention was coated on a cloth and tested. The conductivity of the obtained coated cloth was greater than or equal to 10 3 .

[0114] The present invention provides a special conductive slurry for coating and a preparation method thereof, which solves the problem of selecting conductive materials and optimizing additives in the conductive slurry. The method is simple and easy to implement, convenient for production, and has a low cost for preparing the conductive slurry. The coating after coating and drying has strong fastness and is not easy to fall off, and the conductive carbon material can be firmly adhered to the surface of chemical fiber or cloth. The conductive effect of the obtained slurry is good, which can reach 10 to the power of 3, meeting the conductivity requirements.

[0115] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A method for preparing a special conductive paste for coating, characterized in that: The method comprises: Step 1, weigh each raw material according to proportion; The raw materials are composed of the following components by mass percentage: 2% to 10% of graphene powder, 10% to 20% of conductive carbon black powder, 1% to 5% of a first dispersant, 1% to 5% of a second dispersant, 0.1% to 1% of a pH adjuster, 0.5% to 2% of a thickener, 20% to 35% of an aqueous binder, and 30% to 50% of mineral water; The first dispersant is any one or more of polyethylene glycol, polyvinyl alcohol, polyvinyl pyrrolidone, sodium lignin sulfonate, and sodium hexadecylbenzene sulfonate; The second dispersant is KD1 or BYK-2150; Step 2, mixing the graphene powder and the conductive carbon black powder, adding the first dispersant, and stirring evenly; Step 3, heating the mineral water, adding the second dispersant, stirring evenly, and then adding the mixture obtained in step 2 to the aqueous solution, stirring and mixing evenly; Step 4, adjusting the pH value of the mixed solution obtained in step 3 to neutral with a pH adjuster; Step 5, adding an aqueous binder to the mixed solution, and continuing to stir evenly to obtain a mixed slurry; Step 6, adjusting the viscosity of the mixed slurry with a thickener; Step 7, coating the slurry obtained in step 6 on the cloth and drying it; Step 8, testing the conductivity of the coated cloth obtained in step 7 and the wear resistance of the conductive coating.

2. The method for preparing a special conductive paste for coating according to claim 1, characterized in that: The pH regulator is one or more of ammonia water, sodium bicarbonate and hydrochloric acid.

3. The method for preparing a special conductive paste for coating according to claim 1, characterized in that: The water-based adhesive is any one or more of styrene-butadiene rubber emulsion, water-based polyacrylate emulsion and polytetrafluoroethylene emulsion.

4. The method for preparing a special conductive paste for coating according to claim 1, characterized in that: The thickener is any one or more of hydroxyethyl cellulose, sodium hydroxymethyl cellulose and sodium alginate.

5. The method for preparing a special conductive paste for coating according to claim 1, characterized in that: In the step 2, the graphene powder and the conductive carbon black powder are mixed, the first dispersant is added, and the mixture is stirred thoroughly for 1 hour by a high-speed stirrer to be uniformly mixed.

6. The method for preparing a special conductive paste for coating according to claim 1, characterized in that: In the step 3, the mineral water is heated to 40-60°C.