Composite polymer conductive paste, application and circuit drawing tool

Abstract

The invention provides composite polymer conductive paste, application and a circuit drawing tool. The composite polymer conductive paste is composed of the following components in percentage by mass: 35-65% of acrylic resin emulsion; 15-45% of silver coated copper powder; pigment < = 7%; 8-20% of a diluent; less than or equal to 10% of pearl powder; and 3.8-12% of an auxiliary agent. The composite polymer conductive paste disclosed by the invention can be rapidly cured at normal temperature to form a thin-layer conductor, and the conductor has good toughness and relatively low resistivity, so that the thin-layer conductor can play a conductive role of a physical lead in application occasions such as children teaching aids and electronic circuit repair.

Description

Technical Field

[0001] The invention relates to the technical field of conductive ink, in particular to a composite polymer conductive paste, application and circuit drawing tool. Background Art

[0002] As we all know, a circuit with a certain connection relationship will have its corresponding function. For example, in the simplest circuit structure formed by physically connecting a battery and a light bulb in series, the wire plays a conductive role. In various scenarios such as teaching and demonstration, in order to play a conductive role, usually only wires (usually copper wires) can be used. However, using wires to connect various electronic components has many defects such as high cost and bulky size.

[0003] More importantly, in order to achieve the conductive effect in teaching, demonstration and other scenarios, traditional wires usually need to be fixed, which leads to very large limitations and difficulties in laying wires on site. Specifically, it is not easy to fix metal wires when they are laid on the surface of smooth materials such as glass. In addition, it is even more difficult to lay metal wires on vertical walls for teaching demonstrations. At the same time, the color of wires in the prior art is usually fixed, which is very restrictive for educational scenarios that need to add creative elements, especially in circuit teaching and demonstration environments for children.

[0004] It should be noted that the above introduction to the background technology is only for the convenience of providing a clear and complete description of the technical solutions of the present application and facilitating the understanding of those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because they are described in the background technology section of the present application. Summary of the invention

[0005] The purpose of the present invention is to disclose a composite polymer conductive paste, based on the application of the composite polymer conductive paste, and a circuit drawing tool, so as to completely abandon the physical form of the wire, so as to achieve the effect of wire conductivity through the composite polymer, so as to adapt to many scenarios such as inspiring children's thinking and circuit teaching, and make the operation of drawing circuits with conductive functions more convenient.

[0006] In order to achieve the above-mentioned invention purpose, the present application first discloses a composite polymer conductive paste, which is composed of the following components in percentage by mass:

[0007]

[0008] As a further improvement of the present invention, the composite polymer conductive paste is composed of the following components in percentage by mass:

[0009]

[0010] As a further improvement of the present invention, the average particle size of the silver-coated copper powder is 10 to 15 microns.

[0011] As a further improvement of the present invention, the auxiliary agent is composed of the following components in percentage by mass:

[0012]

[0013] As a further improvement of the present invention, the auxiliary agent is composed of the following components in percentage by mass:

[0014] Dispersant 3-4%;

[0015] Crosslinking agent 1-2%;

[0016] Leveling agent 1-2%;

[0017] Brightener 1%.

[0018] As a further improvement of the present invention, the average particle size of the pigment is 45 microns, and the particle size range of the pearl powder is 1 to 15 microns.

[0019] As a general technical concept, the present application also discloses the use of any one of the above-mentioned composite polymer conductive pastes in children's teaching tools, flexible circuit boards, and rigid circuit boards.

[0020] As a general technical concept, the present application also discloses a circuit drawing tool, including a shell, and the composite polymer conductive paste disclosed in any one of the above inventions contained in the shell.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The composite polymer conductive paste disclosed in the present invention can be quickly cured at room temperature to form a thin conductor, and the conductor has good toughness and low resistivity, so that the thin conductor can play the conductive role of a physical wire in applications such as children's teaching tools and electronic circuit repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A circuit diagram drawn using the composite polymer conductive paste disclosed in the present invention. DETAILED DESCRIPTION

[0024] The present invention is described in detail below in conjunction with the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these embodiments are all within the scope of protection of the present invention.

[0025] The composite polymer conductive paste disclosed in the present invention can be used to replace traditional physical wires to play a conductive role, and the voltage used is less than the safety voltage of 48VDC, and the most preferred adaptation voltage is 12VDC. It can be widely used in children's teaching tools, electronic ink screens and other commercial promotional application scenarios, or applied to greeting cards made of paper or other materials to connect batteries, speakers, single-chip microcomputers or other electronic components on greeting cards, or any other scenarios where it is inconvenient or inappropriate to arrange metal wires to achieve electrical connection. In this specification, only the scenarios where it can be applied and the technical effects it has are shown by way of example.

[0026] A composite polymer conductive paste, the composite polymer conductive paste is composed of the following components in mass percentage: 35-65% acrylic resin emulsion; 15-45% silver-coated copper powder; ≤7% pigment; 8-20% diluent; ≤10% pearl powder; 3.8-12% additive. Further preferably, the composite polymer conductive paste is composed of the following components in mass percentage: 35-55% acrylic resin emulsion; 25-35% silver-coated copper powder; 5-7% pigment; 10-20% diluent; ≤8% pearl powder; 4.5-10% additive. Among them, the average particle size of the silver-coated copper powder is 10-15 microns. The silver-coated copper powder plays a conductive role in the composite polymer conductive paste. Compared with the technical solution of simply using silver powder or copper powder, the silver-coated copper powder in this embodiment takes into account the dual advantages of the conductivity of silver powder and the low cost of copper powder.

[0027] In the present embodiment, acrylic resin emulsion is used instead of conventional epoxy resin in the prior art because acrylic resin emulsion has excellent performance, is soluble in water, and is miscible with other resins, so it is easy to modify and can cooperate with other additives in the present embodiment to achieve the final conductive film (i.e., "circuit 10" described below) having good toughness and low resistivity; at the same time, it is very suitable for coating on the surface of various materials such as glass, wood, paper, latex wall, etc. to form circuit 10.

[0028] At the same time, after repeated experiments, the applicant unexpectedly discovered that when the particle size of the silver-coated copper powder exceeds 20 microns, the physical properties deteriorate after the paste is formed, for example: the edge brightness deteriorates, the toughness deteriorates, the brittleness increases, and it is easy to break. At the same time, the specific surface area increases several times, and the silver plating cost increases. At the same time, the applicant discovered through experiments that when the particle size of the silver-coated copper powder is less than 5um, the above-mentioned various performances are not significantly improved compared with the silver-coated copper powder with a particle size of 10-15um, but the price is several times higher. Therefore, it is very reasonable for the applicant to select the particle size of the silver-coated copper powder to be 10-15um.

[0029] Considering that the composite polymer conductive paste needs to make the conductive film layer have high toughness, adhesion and surface smoothness after being coated on the surface of the object, in this embodiment, the composite polymer conductive paste is added with an auxiliary agent. The auxiliary agent is composed of the following components in mass percentage: 2-5% dispersant; 1-3% cross-linking agent; 0.5-3% leveling agent; 0.3-1% brightening agent.

[0030] Preferably, the auxiliary agent is composed of the following components in mass percentage: 3-4% dispersant, 1-2% crosslinking agent, 1-2% leveling agent, and 1% brightener. Specifically, the dispersant can be selected from one or a mixture of ethylene glycol phenyl ether, carboxylic acid-sulfonate copolymer, acrylic acid-acrylate-phosphonic acid-sulfonate tetrapolymer, acrylic acid-sulfonic acid-amide copolymer, or maleic acid-acrylic acid copolymer sodium salt.

[0031] The cross-linking agent can increase the fastness of the conductive film layer formed after the composite polymer conductive paste is coated on the surface of the object, and can improve the linking degree of each component in the composite polymer conductive paste. The cross-linking agent can be selected from one or a mixture of hydroxyethyl acrylate, hydroxypropyl acrylate, methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, divinylbenzene, N-hydroxymethyl acrylamide or diacetone acrylamide. The leveling agent can promote the coating to form a flat, smooth and uniform coating film during the drying and film-forming process. It can effectively reduce the surface tension of the coating liquid and improve its leveling and uniformity. Specifically, in this embodiment, the leveling agent can be selected from an acrylate polymer. The brightener can be selected from aqueous wax.

[0032] The average particle size of the pigment is 45 microns, the particle size of the pearl powder ranges from 1 to 15 microns, and 5 microns is specifically selected in this embodiment. Adding pearl powder can further improve the granularity of the conductive film layer formed by the composite polymer conductive paste after curing. Adding pigments can make the composite polymer conductive paste have colorful colors to adapt to the formation of colored circuits that meet the interests of children in children's teaching aids scenes, and various electronic components are set in the colored circuits.

[0033] Ginseng Figure 1FIG. 1 shows a circuit structure coated on a wall using a composite polymer conductive paste disclosed in this embodiment. The circuit includes a battery 40, a light bulb 20, a switch 30, and a circuit 10 electrically connecting the battery 40, the light bulb 20, and the switch 30. The circuit 10 can be formed by coating the wall with the composite polymer conductive paste.

[0034] At the same time, since the composite polymer conductive paste has a certain fluidity just before being coated on the wall, the circuit 10 can be drawn into any shape. Therefore, the formed circuit 10 does not need to be fixedly installed using a fixing piece, and can be used in occasions of different shapes or different spatial structures.

[0035] Therefore, it has a unique use in forming beautiful and creative circuits in children's teaching aids and commercial promotions, and can completely abandon traditional metal wires.

[0036] Next, three specific formulations are shown, and a number of data such as resistivity and toughness are compared and explained, as shown in Table 1.

[0037]

[0038] Table 1

[0039] In Table 1, the test conditions for resistivity are: a 1cm×10cm paper strip is evenly coated with the composite polymer conductive slurry on the surface of the paper strip, and the resistance is measured after drying.

[0040] Heating and drying time test conditions: relative air humidity 60%, heating state, 2000W hot air blower at maximum wind speed, blowing 20cm away from the sample.

[0041] Normal temperature drying time test conditions: Normal temperature is 25℃ drying.

[0042] If the composite polymer conductive paste does not come out when lightly touched with a finger, it is judged to be completely dry, and is applicable to both the above-mentioned heating drying time test and the room temperature drying time test.

[0043] Toughness test standard: when the substrate of the sample is bent 60 degrees, the fracture is '-'; when the substrate is flattened and deformed, if the wrinkles exceed 15, it is '+'; when the substrate is flattened and deformed, if the wrinkles are between 10-14, it is evaluated as '++'; when the substrate is flattened and deformed, if the wrinkles are between 5-10, it is evaluated as '+++'; when the substrate is flattened and deformed, if the wrinkles are between 0-5, it is evaluated as '++++'.

[0044] At the same time, this embodiment also discloses an application of the composite polymer conductive paste mentioned above in children's teaching tools, flexible circuit boards, and rigid circuit boards. The application scenarios and beneficial effects are shown above.

[0045] At the same time, this embodiment also discloses a circuit drawing tool, including a shell, and the composite polymer conductive paste as mentioned above contained in the shell. The end of the shell is formed similar to a ball in the prior art, and of course it can also be configured as other common writing tools in the prior art, such as: a fountain pen, a ballpoint pen or other various types of drawing tools or writing tools that can control the composite polymer conductive paste with a certain fluidity to be controlled and coated on the surface of an object.

[0046] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

[0047] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0048] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A composite polymer conductive paste, characterized in that: The composite polymer conductive paste is composed of the following components in percentage by mass:

2. The composite polymer conductive paste according to claim 1, characterized in that: The composite polymer conductive paste is composed of the following components in percentage by mass:

3. The composite polymer conductive paste according to claim 1, characterized in that: The average particle size of the silver-coated copper powder is 10 to 15 microns.

4. The composite polymer conductive paste according to claim 3, characterized in that: The auxiliary agent is composed of the following components in percentage by mass:

5. The composite polymer conductive paste according to claim 4, characterized in that: The auxiliary agent is composed of the following components in percentage by mass: Dispersant 3-4%; Crosslinking agent 1-2%; Leveling agent 1-2%; Brightener 1%.

6. The composite polymer conductive paste according to claim 3, characterized in that: The average particle size of the pigment is 45 microns, and the particle size of the pearl powder ranges from 1 to 15 microns.

7. Use of the composite polymer conductive paste as claimed in claim 1 or 2 in children's teaching tools, flexible circuit boards, and rigid circuit boards.

8. A circuit drawing tool, characterized in that: The invention comprises a shell, and the composite polymer conductive paste according to any one of claims 1 to 6 contained in the shell.

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