CN114621620B - Carbon black for antistatic coating - Google Patents
Carbon black for antistatic coating Download PDFInfo
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- CN114621620B CN114621620B CN202210434063.2A CN202210434063A CN114621620B CN 114621620 B CN114621620 B CN 114621620B CN 202210434063 A CN202210434063 A CN 202210434063A CN 114621620 B CN114621620 B CN 114621620B
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- carbon black
- nano carbon
- antistatic coating
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- C—CHEMISTRY; METALLURGY
- 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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/02—Ingredients treated with inorganic substances
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
Abstract
The invention provides carbon black for an antistatic coating, which has the advantages that the specific surface area of the nano carbon black is greatly increased, the conductivity of the nano carbon black is improved, the addition amount of the nano carbon black in the antistatic coating is effectively reduced, and the antistatic performance of the carbon black is greatly improved by fully reacting the nano carbon black in a supercritical water system.
Description
Technical Field
The invention relates to the technical field of nano carbon black modification, in particular to carbon black for an antistatic coating.
Background
The nano carbon black has excellent colorability, weather resistance and chemical stability, is rich in source and low in price, and is one of important coloring agents. And because the nano carbon black has conductivity, the nano carbon black has wide application in the field of antistatic coatings.
In the prior art, because the conductivity of the nano carbon black is limited, the addition amount of the nano carbon black in the antistatic coating is generally more than 15 percent, and the surface resistivity of the nano carbon black is still kept at 10 7 -10 9 Omega, the antistatic properties are not good under dry weather conditions.
Disclosure of Invention
The invention provides carbon black for an antistatic coating, which has the advantages that the specific surface area of the nano carbon black is greatly increased, the conductivity of the nano carbon black is improved, the addition amount of the nano carbon black in the antistatic coating is effectively reduced, and the antistatic performance of the carbon black is greatly improved by fully reacting the nano carbon black in a supercritical water system.
The preparation process of the carbon black for the antistatic coating comprises the following steps:
(1) Dispersing nano carbon black in purified water with the mass multiple of 1-2 times, adding a dispersing agent with the mass of 1-3 per mill of the nano carbon black and polydimethylsiloxane emulsion with the mass of 2-3% of the nano carbon black, and grinding and dispersing to prepare a paste dispersion;
(2) Adding the paste dispersion into a supercritical reactor, heating and pressurizing to a supercritical state for 3-5min, then reducing pressure and evaporating water to dryness to obtain the carbon black for the antistatic coating.
Further, the particle size of the nano carbon black in the step (1) is 40-100nm.
Further, the dispersant in the step (1) is one or more of Disper-9076, AKN-2290 and AKN-2300.
Further, the supercritical state control temperature in the step (2) is 374.3 ℃ and the pressure is 22.13MPa.
Further, graphite powder with the mass of 0.5-1.0% of that of the nano carbon black is added in the step (1).
The invention has the technical effects and advantages that:
1. according to the invention, the nano carbon black reacts with water in a supercritical state, the internal form of the nano carbon black is changed, the specific surface area of the nano carbon black is greatly improved, the conductivity of the nano carbon black is improved, the addition amount of the nano carbon black in the antistatic coating is effectively reduced, and the antistatic performance of the antistatic coating is greatly improved;
2. the conductive performance of the prepared carbon black for the antistatic coating can be further improved by mixing trace graphite powder in the nano carbon black.
Detailed Description
Example 1
The preparation process of the carbon black for the antistatic coating comprises the following steps:
(1) Dispersing nano carbon black with the particle size of 40nm in purified water with the mass multiple of 2 times, adding a dispersing agent Disper-9076 with the mass of 3 per mill of the nano carbon black and polydimethylsiloxane emulsion with the mass of 2 percent of the nano carbon black, simultaneously adding graphite powder with the mass of 0.5 percent of the nano carbon black, and grinding and dispersing to prepare a paste-like dispersion;
(2) Adding the paste dispersion into a supercritical reactor, heating and pressurizing to a supercritical state for 3min, controlling the temperature of 374.3 ℃ and the pressure of 22.13MPa in the supercritical state, then reducing the pressure and evaporating the water to dryness, thus obtaining the carbon black for the antistatic coating.
Example 2
The preparation process of the carbon black for the antistatic coating comprises the following steps:
(1) Dispersing nano carbon black with the particle size of 50nm in purified water with the mass multiple of 1.5 times, adding a dispersing agent AKN-2290 with the mass of 2 thousandth of the nano carbon black and polydimethylsiloxane emulsion with the mass of 2.2 percent of the nano carbon black, simultaneously adding graphite powder with the mass of 1.0 percent of the nano carbon black, and grinding and dispersing to prepare a paste dispersion;
(2) Adding the paste dispersion into a supercritical reactor, heating and pressurizing to a supercritical state for 3min, controlling the temperature of 374.3 ℃ and the pressure of 22.13MPa in the supercritical state, then reducing the pressure and evaporating the water to dryness, thus obtaining the carbon black for the antistatic coating.
Example 3
The preparation process of the carbon black for the antistatic coating comprises the following steps:
(1) Dispersing nano carbon black with the particle size of 100nm in purified water with the mass multiple of 1 time, adding a dispersing agent AKN-2300 accounting for 1 thousandth of the mass of the nano carbon black and polydimethylsiloxane emulsion accounting for 3 percent of the mass of the nano carbon black, simultaneously adding graphite powder accounting for 1.0 percent of the mass of the nano carbon black, and grinding and dispersing to prepare a paste-like dispersion;
(2) Adding the paste dispersion into a supercritical reactor, heating and pressurizing to a supercritical state for 5min, controlling the temperature of 374.3 ℃ and the pressure of 22.13MPa in the supercritical state, then reducing the pressure and evaporating the water to dryness, thus obtaining the carbon black for the antistatic coating.
Example 4
Carbon black for antistatic coating, wherein graphite powder is not added in the step (1), and the rest of the process is the same as that of example 2.
Comparative example 1
The same lot of the nano carbon black as the nano carbon black in the step (1) of the example 2.
Comparative example 2
Graphite powder was mixed with the same batch of the nano-carbon black as described in the step (1) of example 2 in an amount of 1.0% by mass.
Comparative example 3
The modified nano carbon black has the same process as the example 2 except that no dispersant is added in the step (1).
Comparative example 4
The modified nano carbon black is prepared by the same process as that of example 2 except that polydimethylsiloxane emulsion is not added in the step (1).
Comparative example 5
The modified nanometer carbon black has the temperature controlled in the supercritical reactor of step 2 at 372 deg.c and pressure controlled at 22.13MPa, and the other technological steps are the same as those in example 2.
And (3) effect comparison:
epoxy resin E-44 is taken as a curing system, and an organic tin catalyst is added to prepare the thermosetting varnish. Then 10% of the nano carbon black prepared by the processes of the above examples and comparative examples was added to the thermosetting varnish, and sanding was performed by a carbon black rod sander LDM5L to prepare an antistatic coating.
1. Calculating the mass loss of the solid in the supercritical reactor of each embodiment and comparative example process, observing whether the product is agglomerated after water is evaporated, and testing the specific surface area of the nano carbon black by adopting a method of GB/T19587-2017 determining the specific surface area of the solid substance by a gas adsorption BET method;
2. the nano carbon black was prepared according to the processes of the above examples and comparative examples, and the time required for sand-milling in the heat-curable varnish was recorded;
3. the antistatic coating was applied to a 20 μm film former and dried, and the surface resistivity (Ω) of the coating was measured according to the measuring method of GB/T1410-2006 test method for volume resistivity and surface resistivity of solid insulating material.
The above examples and comparative examples are only intended to illustrate the technical solution of the present invention and not to limit the same, and although the present invention has been described in detail by the above examples and comparative examples, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the present invention as defined by the claims.
Claims (4)
1. A carbon black for antistatic coating, characterized in that: the preparation process of the carbon black for the antistatic coating comprises the following steps:
(1) Dispersing nano carbon black in purified water with the mass multiple of 1-2 times, adding a dispersing agent with the mass of 1-3 per mill of the nano carbon black and polydimethylsiloxane emulsion with the mass of 2-3% of the nano carbon black, and grinding and dispersing to prepare a paste dispersion;
(2) Adding the paste dispersion into a supercritical reactor, heating and pressurizing to a supercritical state for 3-5min, then reducing pressure and evaporating water to dryness to obtain carbon black for the antistatic coating;
controlling the temperature of the supercritical state in the step (2) to be 374.3 ℃ and the pressure to be 22.13MPa.
2. The carbon black for antistatic coating according to claim 1, characterized in that: the particle size of the nano carbon black in the step (1) is 40-100nm.
3. The carbon black for antistatic coating according to claim 1, characterized in that: the dispersant in the step (1) is one or more of Disper-9076, AKN-2290 and AKN-2300.
4. The carbon black for antistatic coating according to claim 1, characterized in that: graphite powder with the mass of 0.5-1.0% of that of the nano carbon black is also added in the step (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210434063.2A CN114621620B (en) | 2022-04-24 | 2022-04-24 | Carbon black for antistatic coating |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210434063.2A CN114621620B (en) | 2022-04-24 | 2022-04-24 | Carbon black for antistatic coating |
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| Publication Number | Publication Date |
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| CN114621620A CN114621620A (en) | 2022-06-14 |
| CN114621620B true CN114621620B (en) | 2022-11-15 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003311174A (en) * | 2002-04-25 | 2003-11-05 | Nippon Shokubai Co Ltd | Method for manufacturing solid fine particle dispersion liquid |
| JP2004339428A (en) * | 2003-05-19 | 2004-12-02 | Mitsubishi Chemicals Corp | Aqueous carbon black dispersion and preparation of the same |
| JP2005097420A (en) * | 2003-09-25 | 2005-04-14 | Chubu Electric Power Co Inc | Method for surface modification of fine particle |
| CN105348967A (en) * | 2015-12-04 | 2016-02-24 | 中国中化股份有限公司 | Carbon-serial water-based highly-conductive coating and application thereof |
| CN114367383A (en) * | 2022-01-13 | 2022-04-19 | 苏州丰倍生物科技有限公司 | Fatty acid ester nano suspension, preparation method and application thereof |
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2022
- 2022-04-24 CN CN202210434063.2A patent/CN114621620B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003311174A (en) * | 2002-04-25 | 2003-11-05 | Nippon Shokubai Co Ltd | Method for manufacturing solid fine particle dispersion liquid |
| JP2004339428A (en) * | 2003-05-19 | 2004-12-02 | Mitsubishi Chemicals Corp | Aqueous carbon black dispersion and preparation of the same |
| JP2005097420A (en) * | 2003-09-25 | 2005-04-14 | Chubu Electric Power Co Inc | Method for surface modification of fine particle |
| CN105348967A (en) * | 2015-12-04 | 2016-02-24 | 中国中化股份有限公司 | Carbon-serial water-based highly-conductive coating and application thereof |
| CN114367383A (en) * | 2022-01-13 | 2022-04-19 | 苏州丰倍生物科技有限公司 | Fatty acid ester nano suspension, preparation method and application thereof |
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| Publication number | Publication date |
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| CN114621620A (en) | 2022-06-14 |
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