CN111040498A - Aqueous inorganic conductive liquid and preparation method and application thereof - Google Patents
Aqueous inorganic conductive liquid and preparation method and application thereof Download PDFInfo
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- CN111040498A CN111040498A CN201911388364.0A CN201911388364A CN111040498A CN 111040498 A CN111040498 A CN 111040498A CN 201911388364 A CN201911388364 A CN 201911388364A CN 111040498 A CN111040498 A CN 111040498A
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/24—Electrically-conducting paints
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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Abstract
The invention discloses a water-based inorganic conductive liquid, a preparation method and application thereof, relates to the technical field of conductive agents, and is mainly prepared from the following raw materials in percentage by weight: 0.1-2% of carbon nano tube, 1-3% of anionic dispersant, 0.1-1% of organic silicon defoamer and 94-98.8% of water. The aqueous inorganic conductive liquid has the advantages of permanent and stable conductivity, consistent powdering effect and convenient construction. The preparation method of the aqueous inorganic conductive liquid is simple, the raw materials are cheap and easy to obtain, large-scale production is easy to realize, and the prepared aqueous inorganic conductive liquid is uniform in dispersion and good in stability. The aqueous inorganic conductive liquid is applied to the aspect of surface conductive pretreatment of a thermosensitive insulating base material, can improve the electrostatic binding force between the powder coating and a plate, and has good powdering effect.
Description
Technical Field
The invention relates to the technical field of conductive agents, in particular to aqueous inorganic conductive liquid and a preparation method and application thereof.
Background
Electrostatic spraying is a spraying method that makes negatively charged paint particles directionally move along the opposite direction of an electric field by using a high-voltage electrostatic electric field and adsorbs the paint particles on the surface of a workpiece. The precondition of spraying the powder coating is that the electrical conductivity of the substrate is excellent and a continuous electric field adsorption force can be provided to the powder particles. The heat-sensitive insulating base material has poor conductivity and needs to solve the problem of uniform adsorption capacity to charged powder. However, due to the fact that the density of the plate is not uniform, the water content of different plates is different, the water film distribution on the surface of the plate is not uniform, the surface resistance is unstable, the powdering condition is different, and the powdering effect is difficult to guarantee especially on the water caltrop edges and the side edges.
The conductive pretreatment process is to uniformly spray aqueous inorganic conductive liquid on a plate, after drying the water, form a compact, permanent and stable, humidity-independent conductive effect through the nano inorganic conductive material attached to the surface of the plate, and meet reliable electrostatic coating conditions. Therefore, the development of the water-based inorganic conductive liquid with permanent and stable conductivity, consistent powdering effect and convenient construction is needed.
Disclosure of Invention
Aiming at the defects in the prior art, the first object of the invention is to provide a water-based inorganic conductive liquid, which is used for solving the problems of poor surface conductivity, unstable resistance and poor powdering effect of a plate, and simultaneously simplifying the construction process and facilitating the construction.
The second purpose of the invention is to provide a preparation method of the aqueous inorganic conductive liquid, which has the advantages of simple preparation method, cheap and easily available raw materials, low cost and easy large-scale production, and the prepared aqueous inorganic conductive liquid has uniform dispersion and good stability.
The third purpose of the invention is to provide the application of the water-based inorganic conductive liquid in the aspect of conductive pretreatment of the surface of the heat-sensitive insulating base material, the water-based inorganic conductive liquid has permanent, stable and reliable conductive performance, can improve the electrostatic binding force between the powder coating and the plate, has good powdering effect and is convenient to construct.
In order to achieve the first object, the invention provides the following technical scheme: the water-based inorganic conductive liquid is mainly prepared from the following raw materials in percentage by weight: 0.1-2% of carbon nano tube, 1-3% of anionic dispersant, 0.1-1% of organic silicon defoamer and 94-98.8% of water.
By adopting the technical scheme, the aqueous inorganic conductive liquid comprises the carbon nano tube, the carbon nano tube is a one-dimensional quantum inorganic material with a special structure (the radial dimension is nano-scale, the axial dimension is micron-scale, and two ends of the tube are basically sealed), the aqueous inorganic conductive liquid has the advantages of complete structure, high length-diameter ratio, light weight, high strength, high temperature resistance, corrosion resistance, good heat transfer and conductivity, and many abnormal mechanical, electrical and chemical properties, and the addition of the carbon nano tube can enable the aqueous inorganic conductive liquid to have permanent and stable conductivity. Meanwhile, the aqueous inorganic conductive liquid obtained by adopting the formula disclosed by the invention has strong dispersibility and good adhesive force, so that the surface resistance is uniform and has no blind area, the surface resistance of the plate can be uniformly sprayed, the surface resistance value of the plate is accurately controlled, the uniformity and stability of the surface resistance value are ensured, the powdering effect is consistent, the corner powdering condition is improved, and the electrostatic binding force between the powder coating and the plate is improved, thereby improving the reliability and consistency of electrostatic powder coating. The aqueous inorganic conductive liquid has low viscosity, can be directly sprayed and dipped and is convenient to construct.
Further, the aqueous inorganic conductive liquid is mainly prepared from the following raw materials in percentage by weight:
0.5-1.5% of carbon nano tube, 1.5-2.5% of anionic dispersing agent, 0.3-0.6% of organic silicon defoaming agent and 95.4-97.7% of water.
Further, the aqueous inorganic conductive liquid is mainly prepared from the following raw materials in percentage by weight:
1% of carbon nano tube, 2% of anionic dispersant, 0.4% of organic silicon defoamer and 96.6% of water.
By adopting the technical scheme, the proportion of the raw materials is further optimized, so that the conductivity and the powdering effect of the aqueous inorganic conductive liquid are more remarkable, the surface conductive pretreatment effect of the thermosensitive insulating base material is better, and the spraying of the powder coating is facilitated.
Further, the anionic dispersing agent is one or more of sodium dodecyl benzene sulfonate, sodium oleate and sodium dodecyl sulfate.
By adopting the technical scheme, the anionic dispersing agent is composed of a nonpolar and negatively charged oleophylic hydrocarbon chain part and a polar hydrophilic group, the two groups are respectively positioned at two ends of a molecule to form an asymmetric hydrophilic-oleophylic molecular structure, and the compatibility with solvent water is good. The sodium dodecyl benzene sulfonate contains aromatic groups, and the aromatic groups have good affinity with the tube wall of the carbon nano tube and are easy to adsorb on the tube wall, so that the carbon nano tube can be uniformly dispersed in water.
In order to achieve the second object, the invention provides the following technical scheme:
a preparation method of aqueous inorganic conductive liquid comprises the following steps:
a. adding the carbon nano tube, the anionic dispersant and the organic silicon defoamer into water, and uniformly mixing to obtain a mixed solution;
b. and (3) carrying out ultrasonic stirring on the mixed solution to obtain the stable aqueous inorganic conductive solution.
By adopting the technical scheme, the raw materials are cheap and easy to obtain, the cost is low, the preparation process is simple, the large-scale production is easy, and the prepared aqueous inorganic conductive liquid is uniform in dispersion and good in stability. .
Further, the mixing process is carried out in a negative pressure type vacuum dispersion vessel.
Through adopting above-mentioned technical scheme, the material is in negative pressure formula vacuum dispersion container internal circulation flow, and the negative pressure can reduce the formation of bubble in the material, and circulation flow makes the material intensive mixing homogeneous.
Further, the ultrasound adopts a variable frequency intermittent high-power ultrasonic dispersion machine, and the ultrasound power is 10 kW.
By adopting the technical scheme, continuous production is guaranteed by frequency conversion intermittent type high-power ultrasonic dispersion, heat generation is reduced, 10kW high-power ultrasonic waves enable conductive materials to be dispersed more uniformly, dispersion is shortened frequently, damage to the conductive materials is reduced, and production efficiency is improved.
Furthermore, the ultrasonic temperature is 25-50 ℃, and the ultrasonic time is 6-10 h.
By adopting the technical scheme, the mixed solution is ultrasonically stirred for 6-10 hours at the temperature of 25-50 ℃, so that the mixed solution can be fully and uniformly mixed to form uniform and stable aqueous inorganic conductive liquid.
In order to achieve the third object, the invention provides the following technical solutions:
the application of the aqueous inorganic conductive liquid in the aspect of conductive pretreatment of the heat-sensitive insulating base material comprises the following steps: dispersing the aqueous inorganic conductive liquid in water, diluting, spraying, and drying at low temperature.
By adopting the technical scheme, in the using process, the aqueous inorganic conductive liquid is diluted according to the condition and can be simply dispersed, the coating operation is simple and convenient, the cost is low, the using amount is small, the requirement on constructors is reduced, the surface appearance flatness and the color of the board are not influenced, the material does not contain resin, and the water is dried at low temperature.
Further, the boiling-dilution ratio of the aqueous conductive liquid to water is 1:3 or 1: 4.
by adopting the technical scheme, the thinning ratio is further optimized, and the cost is favorably controlled on the basis of ensuring that the aqueous inorganic conductive liquid has better conductive performance.
In conclusion, the invention has the following beneficial effects:
the invention adopts the carbon nano tube as the conductive material, so that the aqueous inorganic conductive liquid has permanent and stable conductive performance, and the added anionic dispersant can uniformly disperse the carbon nano tube in water.
Firstly, the preparation process of the aqueous inorganic conductive liquid is simple, the raw materials are easy to obtain, the large-scale production is easy, and the prepared aqueous inorganic conductive liquid has good stability.
Secondly, the aqueous inorganic conductive liquid has low usage amount, simple and convenient coating operation, low requirement on constructors, convenient construction and high plate surface flatness in the using process, and does not influence the apparent flatness and color of the plate surface
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
The aqueous inorganic conductive liquid of the embodiment is mainly prepared from the following raw materials in percentage by weight: 0.1% of carbon nano tube, 0.5% of sodium oleate, 0.5% of sodium dodecyl sulfate, 0.1% of organic silicon defoaming agent and 94% of pure water.
The preparation method of the aqueous inorganic conductive liquid of preparation example 1 includes the following steps:
a. adding carbon nano tubes, sodium oleate, sodium dodecyl sulfate and an organic silicon defoaming agent into pure water, and uniformly mixing in a negative pressure type vacuum dispersion container to obtain a mixed solution;
b. and (3) placing the mixed solution in a variable-frequency high-power ultrasonic dispersion machine for ultrasonic stirring, wherein the ultrasonic power is 10kW, the ultrasonic temperature is 25 ℃, and the ultrasonic time is 6 hours, so as to obtain the stable aqueous inorganic conductive liquid.
Example 2
The aqueous inorganic conductive liquid of the embodiment is mainly prepared from the following raw materials in percentage by weight: 0.5% of carbon nano tube, 1.5% of sodium oleate, 0.3% of organic silicon defoamer and 95% of pure water.
The preparation method of the aqueous inorganic conductive liquid of the preparation example 2 is different from that of the preparation example 1 in that: and (c) in the step b, the ultrasonic temperature is 30 ℃, and the ultrasonic time is 7 h.
Example 3
The aqueous inorganic conductive liquid of the embodiment is mainly prepared from the following raw materials in percentage by weight: 1% of carbon nano tube, 2% of sodium dodecyl benzene sulfonate, 0.4% of organic silicon defoamer and 96.6% of pure water.
The preparation method of the aqueous inorganic conductive liquid of the preparation example 3 is different from that of the example 1 in that: and (c) in the step b, the ultrasonic temperature is 35 ℃, and the ultrasonic time is 8 h.
Example 4
The aqueous inorganic conductive liquid of the embodiment is mainly prepared from the following raw materials in percentage by weight: 1.5% of carbon nano tube, 2.5% of sodium dodecyl sulfate, 0.6% of organic silicon defoaming agent and 97.5% of pure water.
The preparation method of the aqueous inorganic conductive liquid of the preparation example 4 is different from that of the preparation example 1 in that: and (c) in the step b, the ultrasonic temperature is 40 ℃, and the ultrasonic time is 9 h.
Example 5
The aqueous inorganic conductive liquid of the embodiment is mainly prepared from the following raw materials in percentage by weight: 2% of carbon nano tube, 1% of sodium dodecyl benzene sulfonate, 1% of sodium oleate, 1% of sodium dodecyl sulfate, 1% of organic silicon defoamer and 98.6% of pure water.
The preparation method of the aqueous inorganic conductive liquid of the preparation example 5 is different from that of the preparation example 1 in that: and (c) in the step (b), the ultrasonic temperature is 50 ℃, and the ultrasonic time is 10 h.
Example 1 of the application of the aqueous inorganic conductive liquid of the present invention:
the application of the aqueous inorganic conductive liquid of the embodiment comprises the following steps:
the aqueous inorganic conductive liquid in the example 3 is dispersed in pure water, diluted with the ratio of 1:3, sprayed on the surface of the heat-sensitive insulating base material, and dried at low temperature for water content, wherein the drying condition is 50 ℃/5 min.
Example 2 of the application of the aqueous inorganic conductive liquid of the present invention:
the application of the aqueous inorganic conductive liquid of the embodiment comprises the following steps:
the aqueous inorganic conductive liquid in the embodiment 3 is dispersed in pure water, diluted according to the ratio of 1:4, sprayed on the surface of the heat-sensitive insulating base material, and dried at low temperature for 60 ℃/5 min.
Example 3 of the application of the aqueous inorganic conductive liquid of the present invention:
the application of the aqueous inorganic conductive liquid of the embodiment comprises the following steps:
the aqueous inorganic conductive liquid in the example 1 is dispersed in pure water, diluted with the ratio of 1:3, sprayed on the surface of the heat-sensitive insulating base material, and dried at low temperature for 50 ℃/5 min.
Example 4 of the application of the aqueous inorganic conductive liquid of the present invention:
the application of the aqueous inorganic conductive liquid of the embodiment comprises the following steps:
the aqueous inorganic conductive liquid in the example 2 is dispersed in pure water, diluted with the ratio of 1:3, sprayed on the surface of the heat-sensitive insulating base material, and dried at low temperature for water content, wherein the drying condition is 50 ℃/5 min.
Example 5 of the application of the aqueous inorganic conductive liquid of the present invention:
the application of the aqueous inorganic conductive liquid of the embodiment comprises the following steps:
the aqueous inorganic conductive liquid in the embodiment 4 is dispersed in pure water, diluted according to the ratio of 1:3, sprayed on the surface of the heat-sensitive insulating base material, and dried at low temperature for 50 ℃/5 min.
Example 6 of the application of the aqueous inorganic conductive liquid of the present invention:
the application of the aqueous inorganic conductive liquid of the embodiment comprises the following steps:
the aqueous inorganic conductive liquid in the example 5 is dispersed in pure water, diluted with the ratio of 1:3, sprayed on the surface of the heat-sensitive insulating base material, and dried at low temperature for 50 ℃/5 min.
Comparative example
And conducting pretreatment is carried out on the heat-sensitive insulating base material according to the traditional preheating process, and then powder coating is sprayed.
Performance test
The heat-sensitive insulating substrate was subjected to conductive pretreatment in the manner as in examples 1 to 6 of the application of the aqueous inorganic conductive liquid of the present invention, followed by spraying of a powder coating, and the effect of the conductive pretreatment was as shown in table 1, as compared with the heat-sensitive insulating substrate subjected to conductive pretreatment by a conventional preheating process.
TABLE 1 conductive pretreatment Effect in examples 1 to 6 of application of aqueous inorganic conductive liquid
As can be seen from table 1, by comparing examples 1 to 6 and comparative examples of the application of the aqueous inorganic conductive solution, the aqueous conductive solution is sprayed on the surface of the thermosensitive insulating substrate, so that uniform spraying can be realized, the surface resistance value can be accurately controlled, the uniformity and stability of the surface resistance value can be ensured, the electric conduction is permanent and stable, the powdering difference can be reduced, the powder coating is compact and continuous, the flatness is good, the powdering effect is consistent, and the corner powdering condition can be improved; the thermosensitive insulating base material subjected to conductive pretreatment by adopting the traditional preheating process has unstable surface resistance, particularly higher resistance value at corner parts, uneven and discontinuous powder coating and powder falling by vibration, and the base material can deform and crack after continuous heating and curing after preheating and coating.
The aqueous inorganic conductive liquid provided by the invention uses pure water to disperse the inorganic conductive material, does not contain any volatile solvent, has low product viscosity, can be directly sprayed and dipped, is convenient to construct, has lower drying temperature and short time, reduces the construction energy consumption and improves the construction efficiency.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (10)
1. The water-based inorganic conductive liquid is characterized by being mainly prepared from the following raw materials in percentage by weight: 0.1-2% of carbon nano tube, 1-3% of anionic dispersant, 0.1-1% of organic silicon defoamer and 94-98.8% of water.
2. The aqueous inorganic conductive liquid as claimed in claim 1, which is prepared from the following raw materials in percentage by weight: 0.5-1.5% of carbon nano tube, 1.5-2.5% of anionic dispersing agent, 0.3-0.6% of organic silicon defoaming agent and 95.4-97.7% of water.
3. The aqueous inorganic conductive liquid as claimed in claim 1, which is prepared from the following raw materials in percentage by weight: 1% of carbon nano tube, 2% of anionic dispersant, 0.4% of organic silicon defoamer and 96.6% of water.
4. The aqueous inorganic conductive liquid according to claim 1, wherein the anionic dispersant is one or more of sodium dodecylbenzene sulfonate, sodium oleate and sodium dodecyl sulfate.
5. The method for preparing the aqueous inorganic conductive liquid according to any one of claims 1 to 4, characterized by comprising the steps of:
a. adding the carbon nano tube, the anionic dispersant and the organic silicon defoamer into water, and uniformly mixing to obtain a mixed solution;
b. and (3) carrying out ultrasonic stirring on the mixed solution to obtain the stable aqueous inorganic conductive solution.
6. The method for preparing an aqueous inorganic conductive liquid according to claim 5, wherein the mixing process is performed in a negative pressure type vacuum dispersion vessel.
7. The method for preparing the aqueous inorganic conductive liquid according to claim 5, wherein the ultrasound is performed by using a variable frequency intermittent high power ultrasonic dispersion machine, and the ultrasonic power is 10 kW.
8. The preparation method of the aqueous inorganic conductive liquid according to claim 5, wherein the ultrasonic temperature is 25-50 ℃ and the ultrasonic time is 6-10 h.
9. The application of the aqueous inorganic conductive liquid in the aspect of conductive pretreatment of a heat-sensitive insulating substrate, which is characterized by comprising the following steps: dispersing the aqueous inorganic conductive liquid in water, diluting, spraying, and drying at low temperature.
10. The application of the aqueous inorganic conductive liquid in the aspect of conducting pretreatment on the surface of a heat-sensitive insulating substrate according to claim 9, wherein the open-dilute ratio of the aqueous conductive liquid to water is 1:3 or 1: 4.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100271692A1 (en) * | 2009-04-08 | 2010-10-28 | New Jersey Institute Of Technology | Metamaterials with terahertz response and methods of making same |
| CN106189577A (en) * | 2016-06-30 | 2016-12-07 | 嘉兴市高正高分子材料有限公司 | A kind of preparation method of high dispersive type water system carbon nanotube conducting slurry |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100271692A1 (en) * | 2009-04-08 | 2010-10-28 | New Jersey Institute Of Technology | Metamaterials with terahertz response and methods of making same |
| CN106189577A (en) * | 2016-06-30 | 2016-12-07 | 嘉兴市高正高分子材料有限公司 | A kind of preparation method of high dispersive type water system carbon nanotube conducting slurry |
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Application publication date: 20200421 |