CN116218292A - Water-based electromagnetic shielding coating and preparation method and application thereof - Google Patents
Water-based electromagnetic shielding coating and preparation method and application thereof Download PDFInfo
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- CN116218292A CN116218292A CN202310215544.9A CN202310215544A CN116218292A CN 116218292 A CN116218292 A CN 116218292A CN 202310215544 A CN202310215544 A CN 202310215544A CN 116218292 A CN116218292 A CN 116218292A
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Classifications
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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
- C09D125/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
- C09D125/02—Homopolymers or copolymers of hydrocarbons
- C09D125/04—Homopolymers or copolymers of styrene
- C09D125/08—Copolymers of styrene
- C09D125/14—Copolymers of styrene with unsaturated esters
-
- 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
-
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/20—Diluents or solvents
-
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
-
- 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
- C08K3/08—Metals
- C08K2003/0862—Nickel
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
Abstract
The invention relates to the technical field of conductive coatings, in particular to a water-based electromagnetic shielding coating and a preparation method and application thereof. The water-based electromagnetic shielding coating comprises the following raw materials in parts by weight: 20 to 40 parts of film forming resin, 55 to 70 parts of water-based conductive slurry, 0.2 to 1.0 part of flatting agent, 0.1 to 0.5 part of thickening agent, 0.6 to 3.0 parts of sagging resistant agent and 0.1 to 1.0 part of acid-base modifier. Also discloses a preparation method of the water-based electromagnetic shielding coating and application of the water-based electromagnetic shielding coating in improvement of electromagnetic shielding and electromagnetic wave transmission cutting. In the film layer formed by the water-based electromagnetic shielding coating, two or more electromagnetic shielding fillers with different particle diameters are adopted, so that the water-based electromagnetic shielding coating can be fully dispersed in the coating, and has high conductivity; the electromagnetic shielding filler with different particle sizes overcomes the space difference between large particle size filler bodies, and a conductive three-dimensional grid structure with complementary advantages can be formed in the coating, so that the coating has higher electromagnetic shielding efficiency, wider electromagnetic shielding wave band and good electromagnetic shielding effect, and the information safety of a building can be ensured.
Description
Technical Field
The invention relates to the technical field of conductive coatings, in particular to a water-based electromagnetic shielding coating and a preparation method and application thereof.
Background
The conductive coating can be divided into a structural conductive coating and a blended conductive coating, and the blended conductive coating has a plurality of excellent performances, is widely applied and is still the focus of research at present. The conductive paint is mainly prepared from film forming substances, solvents, auxiliary agents, conductive fillers and other raw materials. The film-forming material is a main material which enables the paint to firmly adhere to the surface of the object to be painted to form a continuous film, and forms the basis of the conductive coating. The solvent mainly changes the viscosity characteristics of the paint, and can improve the workability. The auxiliary agent can improve the conductivity and the workability of the coating. Therefore, the film-forming material and the solvent do not have conductivity, which is achieved mainly by uniformly dispersing conductive filler particles having excellent conductive properties in the system.
At present, the conductive filler of the blended conductive coating mainly comprises a metal system and a carbon system, the metal system conductive filler mainly comprises silver powder, nickel powder, copper powder, silver coated copper powder and the like, the carbon system filler is commonly used with graphite, carbon black and the like, and the carbon system conductive coating is widely applied due to good conductivity and low price.
In the traditional paint preparation process, an oily solvent is adopted, and VOC (volatile organic compound) in the oily solvent can volatilize at normal temperature and can generate photochemical reaction with the atmosphere in sunlight, so that the environment is damaged and the harm is brought to human health. In addition, the VOC volatilization is less in the preparation and use processes of the water-based conductive coating, but the existing water-based conductive coating has some defects: the electromagnetic shielding capability is poor, particularly for the shielding efficiency of a low frequency section, and the problems of low solid content, poor electromagnetic shielding effect and the like exist.
In view of this, it is necessary to provide an aqueous electromagnetic shielding paint to solve the above-described drawbacks.
Disclosure of Invention
In order to solve the technical problems, the invention provides a water-based electromagnetic shielding coating, and a preparation method and application thereof. In the film layer formed by the water-based electromagnetic shielding coating, two or more electromagnetic shielding fillers with different particle diameters are adopted, so that the water-based electromagnetic shielding coating can be fully dispersed in the coating, and has high conductivity; the electromagnetic shielding filler with different particle sizes overcomes the space difference between large particle size filler bodies, and a conductive three-dimensional grid structure with complementary weaknesses can be formed in the coating, so that the coating has higher electromagnetic shielding efficiency, wider electromagnetic shielding wave band and good electromagnetic shielding effect.
The invention aims to provide an aqueous electromagnetic shielding coating.
The invention further aims at providing a preparation method of the water-based electromagnetic shielding coating.
Another object of the invention is to provide the use of an aqueous electromagnetic shielding coating.
The water-based electromagnetic shielding coating provided by the specific embodiment of the invention comprises the following raw materials in parts by mass:
20 to 40 parts of film forming resin, 55 to 70 parts of water-based conductive slurry, 0.2 to 1.0 part of flatting agent, 0.1 to 0.5 part of thickening agent, 0.6 to 3.0 parts of sagging resistant agent and 0.1 to 1.0 part of acid-base modifier.
According to the water-based electromagnetic shielding coating provided by the specific embodiment of the invention, the film-forming resin is any one of styrene-acrylic emulsion, water-based epoxy resin, water-based polyurethane resin, water-based pure acrylic emulsion, water-based silicone-acrylic emulsion and water-based vinyl acetate-ethylene copolymer emulsion
The water-based electromagnetic shielding coating provided by the specific embodiment of the invention comprises the following raw materials in parts by weight:
47 to 97 parts of electromagnetic shielding filler, 25 to 35 parts of water, 10 to 20 parts of dispersing agent and 0.2 to 0.5 part of defoaming agent.
According to the water-based electromagnetic shielding coating provided by the specific embodiment of the invention, the electromagnetic shielding filler is selected from any two or more of graphite powder, flake graphite, conductive carbon black, graphene and carbon-coated nickel powder.
According to the water-based electromagnetic shielding coating provided by the specific embodiment of the invention, the electromagnetic shielding filler consists of the following raw materials in parts by weight:
0 to 25 parts of graphite powder, 0 to 25 parts of crystalline flake graphite, 5 to 7 parts of conductive carbon black, 0 to 10 parts of graphene and 0 to 15 parts of carbon-coated nickel powder.
According to the water-based electromagnetic shielding coating provided by the specific embodiment of the invention, the granularity of the graphite powder is 10-15 mu m; the granularity of the conductive carbon black is 20-40 nm; the granularity of the flake graphite is 1-5 mm; the granularity of the carbon-coated nickel powder is 20-200 nm.
The preparation method of the water-based shielding paint provided by the specific embodiment of the invention comprises the following steps:
55 to 70 parts of water-based conductive slurry, 20 to 40 parts of film-forming resin, 0.2 to 1.0 part of flatting agent and 0.6 to 3.0 parts of anti-sagging agent are mixed, and 0.1 to 0.5 part of thickening agent and 0.1 to 1.0 part of acid-base regulator are added after grinding and dispersing to prepare the water-based paint.
According to the preparation method of the water-based shielding coating provided by the specific embodiment of the invention, the grinding time is 100-150 min, and the grinding rotating speed is 1700-2000 rpm.
According to the preparation method of the water-based shielding coating provided by the specific embodiment of the invention, the conditional viscosity of the water-based coating is 110-130 s, and the pH value of the water-based coating is 7.5-9.
According to the application of the water-based electromagnetic shielding coating in the improvement of electromagnetic shielding and cutting off electromagnetic wave transmission, the application scene of electromagnetic shielding comprises but is not limited to the environment needing electromagnetic shielding, such as electronic products, buildings and the like, and the application scene is fully and uniformly coated on the surface of the application scene in a brush coating, wiping coating, rolling coating, knife coating, spraying, dip coating, electrophoresis coating and the like.
The principle of the invention is as follows:
film-forming resin: the paint is firmly adhered to the surface of the coated object and forms a continuous film shape to form the basis of the conductive coating;
aqueous conductive paste: dispersed in a film-forming resin to provide excellent conductive and electromagnetic shielding properties;
conductive carbon black: the conductive carbon black with excellent conductivity, nanoscale granularity and high particle number in unit volume has the characteristics of small density, good stability and high structure, so that the contact point is increased, the inter-particle distance in a dispersion system is reduced, the resistance is reduced, and the conductivity is increased;
graphite powder and flake graphite: are flaky, but have larger granularity difference, and provide conductivity;
graphene: the conductivity is excellent, and the electromagnetic shielding performance is improved;
carbon-coated nickel powder: the nickel particles are coated with the carbon particles, so that a synergistic effect is achieved, the conductivity and the magnetic conductivity of the coating can be improved due to the excellent oxidation resistance and the conductivity and the magnetic conductivity of the nickel powder, but the cost of independently adopting the nickel powder is higher, so that the cost can be reduced by coating the carbon particles outside the nickel particles, meanwhile, the excellent conductivity and the magnetic conductivity can be maintained, and the coating structure has better dispersion property;
dispersing agent: promoting the homogeneous dispersion of each conductive particle in the electromagnetic shielding filler;
defoaming agent: the electromagnetic shielding filler is preferably polydimethylsiloxane, has the model D-129, reduces the surface tension of the electromagnetic shielding filler, eliminates bubbles in the electromagnetic shielding filler, and improves the electric conduction and magnetic conduction effects of the electromagnetic shielding filler;
leveling agent: the coating is preferably polyether modified dimethyl siloxane, the model is BYK-333, so that a smooth, smooth and uniform coating film is formed in the drying and film forming process, the surface tension of the coating can be effectively reduced, the leveling property, the uniformity and the permeability of the coating are improved, the possibility of generating spots and marks in brushing can be reduced, the coverage is improved, and the film forming is uniform and natural;
and (3) a thickening agent: preferably hydrophobically modified polyurethane, to increase the viscosity of the coating to maintain the coating in a uniformly stable suspended or opacified state, or to form a gel;
anti-sagging agent: the preferred model is BYK-420, the active ingredient is modified urea, the solvent is N-methyl pyrrolidone, the viscosity of the paint is improved, and sagging is prevented.
Acid-base modifier: preferably isobutanol amine (2-amino-2-methyl-1 propanol), model AMP-95, is used for regulating the pH value of the coating.
Compared with the prior art, the invention has the beneficial effects that:
1. in the film layer formed by the water-based electromagnetic shielding coating, two or more electromagnetic shielding fillers with different particle diameters are adopted, so that the water-based electromagnetic shielding coating can be fully dispersed in the coating, and has high conductivity; the electromagnetic shielding filler with different particle sizes overcomes the space difference between large particle size filler bodies, and a conductive three-dimensional grid structure with complementary advantages can be formed in the coating, so that the coating has higher electromagnetic shielding efficiency, wider electromagnetic shielding wave band and good electromagnetic shielding effect.
2. When the water-based electromagnetic shielding coating is applied to the inner wall of a building with secret-related requirements, the electromagnetic wave protection performance of the building can be enhanced, and the information safety of the building can be protected.
3. The water-based electromagnetic shielding coating disclosed by the invention takes water as a dispersion medium, does not contain an oily solvent, reduces VOC emission, and is beneficial to environmental protection and human health.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims.
Examples
The water-based electromagnetic shielding coating consists of the following raw materials in parts by weight:
20 to 40 parts of film forming resin, 55 to 70 parts of water-based conductive slurry, 0.2 to 1.0 part of flatting agent, 0.1 to 0.5 part of thickening agent, 0.6 to 3.0 parts of sagging resistant agent and 0.1 to 1.0 part of acid-base modifier.
Preferably, the film-forming resin is any one of styrene-acrylic emulsion, aqueous epoxy resin, aqueous polyurethane resin, aqueous pure acrylic emulsion, aqueous silicone-acrylic emulsion and aqueous vinyl acetate-ethylene copolymer emulsion.
Preferably, the aqueous conductive paste comprises the following raw materials in parts by mass:
47-97 parts of electromagnetic shielding filler, 25-35 parts of water, 10-20 parts of dispersing agent and 0.2-0.5 part of defoaming agent; the aqueous conductive paste is prepared by mixing and homogenizing 47-97 parts of electromagnetic shielding filler, 25-35 parts of water, 10-20 parts of dispersing agent and 0.2-0.5 part of defoaming agent.
Preferably, the electromagnetic shielding filler is selected from any two or more of graphite powder, flake graphite, conductive carbon black, graphene and carbon-coated nickel powder.
Preferably, the electromagnetic shielding filler comprises the following raw materials in parts by weight:
0 to 25 parts of graphite powder, 0 to 25 parts of crystalline flake graphite, 5 to 7 parts of conductive carbon black, 0 to 10 parts of graphene and 0 to 15 parts of carbon-coated nickel powder.
In some examples, the raw materials of the electromagnetic shielding filler are selected from any one or two or more of graphite powder, flake graphite, graphene and carbon-coated nickel powder besides the conductive carbon black, and the electromagnetic shielding filler is prepared by mixing the raw materials with the conductive carbon black, so that the amount of the other raw materials which are not selected is 0.
Preferably, the particle size of the graphite powder is preferably 10 to 15 μm; the granularity of the conductive carbon black is preferably 20-40 nm; the granularity of the flake graphite is preferably 1-5 mm; the granularity of the carbon-coated nickel powder is preferably 20-200 nm; the particle size of the graphite powder, the flake graphite, the conductive carbon black and the carbon-coated nickel powder is the initial particle size of the raw materials, and is not limited in the preparation process, the particle size of the raw materials after grinding is controlled by changing the ball milling time and the rotating speed for the planetary ball mill, namely, the particle size after grinding can be determined when the milling time and the rotating speed are determined, so that the particle size after grinding is not limited.
The embodiment also provides a preparation method of the water-based electromagnetic shielding paint, which comprises the following steps:
55 to 70 parts of water-based conductive paste, 20 to 40 parts of film-forming resin, 0.2 to 1.0 part of flatting agent and 0.6 to 3.0 parts of anti-sagging agent are taken and mixed, and 0.1 to 0.5 part of thickening agent and 0.1 to 1.0 part of acid-base regulator are added for mixing after grinding, so that the water-based electromagnetic shielding coating is prepared.
Preferably, the grinding time is 100-150 min, and the grinding rotating speed is 1700-2000 rpm.
Preferably, the aqueous electromagnetic shielding coating has a conditional viscosity of 110 to 130s and a pH of 7.5 to 9.
The present embodiment also provides applications of the above aqueous electromagnetic shielding paint in improvement of electromagnetic shielding and electromagnetic wave transmission cutting, including but not limited to, coating the aqueous electromagnetic shielding paint on the surface of a device needing electromagnetic shielding to cut off electromagnetic wave transmission and eliminate electromagnetic wave interference.
To further demonstrate the effect of the aqueous electromagnetic shielding coating provided in this example, the following experimental and comparative examples are provided:
experimental example 1.
The experimental example provides a water-based electromagnetic shielding coating, which consists of the following raw materials in percentage by weight:
13g of conductive carbon black, 45g of graphite powder, 45g of crystalline flake graphite, 100g of styrene-acrylic emulsion, 60g of water, 20g of dispersing agent, 2.5g of flatting agent, 1.25g of defoamer, 3.75g of anti-sagging agent, 0.8g of acid-base modifier and 0.4g of thickener.
The preparation of the water-based electromagnetic shielding coating of the experimental example comprises the following steps:
1. weighing 13g of conductive carbon black, 45g of graphite powder and 45g of crystalline flake graphite, adding 60g of water, 20g of dispersing agent and 1.25g of defoaming agent, mixing and homogenizing to obtain aqueous conductive paste;
2. adding 100g of styrene-acrylic emulsion, 2.5g of flatting agent and 3.75g of anti-sagging agent into the water-based conductive slurry, mixing, and grinding 130mi in a sand mill at the rotating speed of 1850rpm to obtain an electromagnetic shielding coating preform;
3. and adding 0.4g of thickener to the electromagnetic shielding coating preform to adjust the viscosity of the system, and adding 0.8g of acid-base regulator to adjust the pH value of the system to obtain the water-based electromagnetic shielding coating.
Experimental example 2
The experimental example is different from experimental example 1 in that:
the water-based electromagnetic shielding coating consists of the following raw materials in parts by weight: 11g of conductive carbon black, 4g of graphene, 43g of graphite powder, 45g of crystalline flake graphite, 100g of styrene-acrylic emulsion, 60g of water, 23g of dispersing agent, 2.5g of flatting agent, 1.25g of defoamer, 3.75g of anti-cross-flow agent, 0.8g of acid-base regulator and 0.5g of thickener.
The preparation method of the aqueous electromagnetic shielding coating of this experimental example is the same as that of experimental example 1.
Experimental example 3
The experimental example is different from experimental example 1 in that:
the water-based electromagnetic shielding coating consists of the following raw materials in parts by weight: 11g of conductive carbon black, 10g of carbon-coated nickel powder, 30g of graphite powder, 45g of crystalline flake graphite, 100g of styrene-acrylic emulsion, 60g of water, 35g of dispersing agent, 3g of flatting agent, 1.25g of defoamer, 2.5g of anti-cross-flow agent, 0.8g of acid-base regulator and 0.5g of thickener.
The preparation method of the aqueous electromagnetic shielding coating of this experimental example is the same as that of experimental example 1.
Comparative example 1
The comparative example is different from experimental example 1 in that:
the water-based electromagnetic shielding coating consists of the following raw materials in parts by weight: 10g of conductive carbon black, 80g of graphite powder, 45g of crystalline flake graphite, 100g of styrene-acrylic emulsion, 60g of water, 27g of dispersing agent, 2.5g of flatting agent, 1.25g of defoamer, 3.75g of anti-sagging agent and 1g of acid-base modifier, and no thickening agent is added.
The preparation method of the aqueous electromagnetic shielding coating of this comparative example is the same as that of experimental example 1.
Comparative example 2
The comparative example is different from experimental example 1 in that:
the water-based electromagnetic shielding coating consists of the following raw materials in parts by weight: 8g of conductive carbon black, 82g of graphite powder, 100g of styrene-acrylic emulsion, 60g of water, 25g of dispersing agent, 1.5g of flatting agent, 1.25g of defoamer, 4.5g of anti-hanging agent, 1.0g of acid-base modifier and 0.2g of thickener.
The preparation method of the aqueous electromagnetic shielding coating of this comparative example is the same as that of experimental example 1.
Performance test:
according to the method for testing the decimeter resistance of the water-based electromagnetic shielding coating recorded in JB/T7129-2008 'continuous test method for meter resistance';
according to GB/T9265-2009 'determination of alkali resistance of building coating' the alkali resistance test method is described for testing the alkali resistance of the water-based electromagnetic shielding coating;
the aqueous electromagnetic shielding paint was applied to one side surface of a normal cement board having a length x width x thickness=60 cm x 60cm x 0.5cm, and after drying, the shielding effectiveness of the aqueous electromagnetic shielding paint of experimental example 1 was tested according to the shielding room method described in GB/T30142-2013 "method for measuring shielding effectiveness of planar electromagnetic shielding materials".
The results of the decimeter resistance tests of the aqueous electromagnetic shielding coatings of experimental examples 1-3 and comparative examples 1-2 are shown in table 1;
experimental examples 1-3 and comparative examples 1-2 the film forming properties, the tack-free time and the alkali resistance of the aqueous electromagnetic shielding coating are shown in table 2;
the results of the shielding effectiveness test of the aqueous electromagnetic shielding coatings of examples 1 to 3 and comparative examples 1 to 2 are shown in Table 3.
TABLE 1
| Decimeter resistor (omega) | |
| Experimental example 1 | 4.5～5.2 |
| Experimental example 2 | 4.1～5.5 |
| Experimental example 3 | 3.9～4.4 |
| Comparative example 1 | 11～13 |
| Comparative example 2 | 13～15 |
TABLE 2
| Film formation characteristics | Time of surface drying | 24h alkali resistance test evaluation | |
| Experimental example 1 | Smooth and uniform surface | 1.5h | No obvious abnormality on the surface |
| Experimental example 2 | Smooth and uniform surface | 1.6h | No obvious abnormality on the surface |
| Experimental example 3 | Smooth and uniform surface | 1.8h | No obvious abnormality on the surface |
| Comparative example 1 | Smooth and uniform surface | ＞2h | No obvious abnormality on the surface |
| Comparative example 2 | Smooth and uniform surface | 1.5h | No obvious abnormality on the surface |
TABLE 3 Table 3
The performance test results show that:
1. the thickener is added in experimental examples 1-3, the optimal dosage of graphite powder, crystalline flake graphite, conductive carbon black, graphene and carbon-coated nickel powder is adjusted, the obtained water-based electromagnetic shielding coating has better decimeter resistance, higher electromagnetic shielding efficiency and wider electromagnetic shielding frequency range, electromagnetic protection can be effectively formed, two or more conductive fillers with different properties, morphology and granularity are mixed and used, the conductive fillers are uniformly dispersed in a matrix of the coating, and the filling factor of the conductive fillers is increased, so that the coating system forms more conductive path networks, the resistance is reduced, the shielding and cutting-off effects on electromagnetic waves are enhanced, and the electromagnetic shielding wave band range is widened.
2. Comparative example 1, which was not added with a thickener, had a decimeter resistance of 11 to 13 and a better conductivity than example 1, but still had a poorer conductivity than experimental examples 1 to 3; the water-based electromagnetic shielding coating of the comparative example 1 shows a hanging flow phenomenon after being coated on an asbestos fiber cement board, and the electromagnetic shielding effect is poor without adding a thickening agent from the test result of shielding effectiveness, and the thickening effect can improve the storage stability and sagging resistance and can improve the electromagnetic shielding effect of the coating.
3. Compared with the experimental example 1, the comparative example 2 reduces the consumption of the conductive carbon black, increases the consumption of the graphite powder, does not adopt crystalline flake graphite, increases the decimeter resistance compared with the comparative example 1, and is not beneficial to improving the conductivity of the coating; the electromagnetic shielding effect of comparative example 2 is still poor from the electromagnetic shielding effect, which shows that the conductive carbon black in the conductive filler plays an important role in conduction, and the added graphite powder and flake graphite provide different shapes and particle size collocations, so that the filling effect in the coating matrix is good, a three-dimensional conductive grid structure is effectively formed, and the electromagnetic shielding effect of the coating is enhanced.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The water-based electromagnetic shielding coating is characterized by comprising the following raw materials in parts by mass:
20 to 40 parts of film forming resin, 55 to 70 parts of water-based conductive slurry, 0.2 to 1.0 part of flatting agent, 0.1 to 0.5 part of thickening agent, 0.6 to 3.0 parts of sagging resistant agent and 0.1 to 1.0 part of acid-base modifier.
2. The aqueous electromagnetic shielding coating according to claim 1, wherein the film-forming resin is any one of styrene-acrylic emulsion, aqueous epoxy resin, aqueous polyurethane resin, aqueous pure acrylic emulsion, aqueous silicone-acrylic emulsion, aqueous vinyl acetate-ethylene copolymer emulsion.
3. The aqueous electromagnetic shielding coating according to claim 1, wherein the aqueous conductive paste is composed of the following raw materials in parts by mass:
47 to 97 parts of electromagnetic shielding filler, 25 to 35 parts of water, 10 to 20 parts of dispersing agent and 0.2 to 0.5 part of defoaming agent.
4. The aqueous electromagnetic shielding paint according to claim 3, wherein the electromagnetic shielding filler is selected from any two or more of graphite powder, flake graphite, conductive carbon black, graphene and carbon-coated nickel powder.
5. The aqueous electromagnetic shielding paint according to claim 3, wherein the electromagnetic shielding filler consists of the following raw materials in parts by mass:
0 to 25 parts of graphite powder, 0 to 25 parts of crystalline flake graphite, 5 to 7 parts of conductive carbon black, 0 to 10 parts of graphene and 0 to 15 parts of carbon-coated nickel powder.
6. The aqueous electromagnetic shielding paint according to claim 4 or 5, wherein the particle size of the graphite powder is 10 to 15 μm; the granularity of the conductive carbon black is 20-40 nm; the granularity of the flake graphite is 1-5 mm; the granularity of the carbon-coated nickel powder is 20-200 nm.
7. A method for preparing the aqueous electromagnetic shielding paint according to any one of claims 1 to 6, comprising the steps of:
55 to 70 parts of water-based conductive paste, 20 to 40 parts of film-forming resin, 0.2 to 1.0 part of flatting agent and 0.6 to 3.0 parts of anti-sagging agent are taken and mixed, and 0.1 to 0.5 part of thickening agent and 0.1 to 1.0 part of acid-base regulator are added for mixing after grinding, so that the water-based electromagnetic shielding coating is prepared.
8. The method according to claim 7, wherein the grinding time is 100 to 150 minutes and the grinding speed is 1700 to 2000rpm.
9. The method according to claim 7, wherein the aqueous electromagnetic shielding paint has a conditional viscosity of 110 to 130s and a pH of 7.5 to 9.
10. Use of the aqueous electromagnetic shielding coating of any one of claims 1-6 for the improvement of electromagnetic shielding from electromagnetic wave propagation.
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