CN105713463B - A kind of electromagnetic wave screen paint and preparation method thereof - Google Patents
A kind of electromagnetic wave screen paint and preparation method thereof Download PDFInfo
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- CN105713463B CN105713463B CN201410742942.7A CN201410742942A CN105713463B CN 105713463 B CN105713463 B CN 105713463B CN 201410742942 A CN201410742942 A CN 201410742942A CN 105713463 B CN105713463 B CN 105713463B
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Abstract
The invention discloses a kind of electromagnetic wave screen paints and preparation method thereof, which is characterized in that the electromagnetic wave screen paint by film-forming resin weight be 100 parts in terms of, including：100 parts of film-forming resin, 60~120 parts of nickel powder, 9~15 parts of stabilizer, 0.6~1.3 part of dispersant, 45~100 parts of solvent, the stabilizer are dimethyl silicone polymer b polymethyl methacrylates.Present invention improves the states of the art excessive, of high cost to conductive filler dosage, coating is poor.
Description
Technical field
The invention belongs to electromagnetic wave screen paint fields, and in particular to a kind of shielding properties is excellent, applied widely answers
Resin type electromagnetic wave screen paint and preparation method thereof.
Background technology
Currently, the development of electromagnetic wave screen paint is increasingly valued by people with exploitation, wherein nickel system coating price
Cheaply, high stability is used widely, as Chinese patent ZL97107514 discloses a kind of original of electromagnetic wave screen paint
Expect mixture and preparation method thereof.It is to be sufficiently mixed micron order nickel powder, film-forming resin, coupling agent, is then added conductive fine
Dimension continues to mix, and is uniformly mixed and coating is made.It uses traditional titanate esters and silane series coupling agent as conductive filler
Inorganic agent, the final dosage of conductive filler reach 70% (weight percent), and excessive conductive filler not only increases cost but also makes
Poor at the coating of coating, later stage adhesive force is inadequate, therefore how to reduce the dosage of conductive filler, ensures capability of electromagnetic shielding
To improve its adhesive force and reduce the hot spot that the use of organic solvent is a research.
Invention content
It is an object of the invention to the states of the art excessive, of high cost for conductive filler dosage, coating is poor, provide one
Kind electromagnetic wave screen paint and preparation method thereof.
To achieve the goals above, the present invention proposes a kind of electromagnetic wave screen paint, with film-forming resin weight for 100 parts
Meter, including：100 parts of film-forming resin, 60~120 parts of nickel powder, 9~15 parts of stabilizer, 0.6~1.3 part of dispersant, solvent 45~
100 parts, the stabilizer is dimethyl silicone polymer-b- polymethyl methacrylates.
The electromagnetic wave screen paint, wherein the film-forming resin is acrylic resin.
The electromagnetic wave screen paint, wherein the nickel powder is micron order nickel powder.
The electromagnetic wave screen paint, wherein a diameter of 1~10 μm of the nickel powder.
The electromagnetic wave screen paint, wherein a diameter of 2~5 μm of the nickel powder.
The electromagnetic wave screen paint, wherein the nickel powder addition is 70~110 parts.
The electromagnetic wave screen paint, wherein the addition of the stabilizer is 9.5~12 parts.
The electromagnetic wave screen paint, wherein the dispersant addition is 0.7~1.1 part.
The electromagnetic wave screen paint, wherein the dispersant is at least selected in organobentonite and silica
It is a kind of.
The electromagnetic wave screen paint, wherein the solvent is carbon tetrachloride, ethyl acetate, methyl acetate, acetic acid fourth
One kind in ester, acetone, methyl ethyl ketone, ethyl alcohol.
To achieve the goals above, the present invention proposes a kind of preparation method of electromagnetic wave screen paint, including：
1) dimethyl silicone polymer-b- polymethyl methacrylates are mixed with solvent, stirs to obtain poly- two
Methylsiloxane-b- polymethyl methacrylate solutions；
2) dispersant and nickel powder are added in dimethyl silicone polymer-b- polymethyl methacrylate solutions and are dispersed with stirring
It is even；
3) film-forming resin is added in step acquired solution, is sufficiently stirred dispersion, the electromagnetic wave screen paint is made.
The present invention uses dimethyl silicone polymer-b- polymethyl methacrylates as stabilizer in dope preparing process
Modified filler, the ketonic oxygen in polymethyl methacrylate has good complexing power for metal ion, with acrylic acid tree
Fat has good compatibility again, therefore filler is modified through dimethyl silicone polymer-b- polymethyl methacrylates, is not required to volume again
It is outer to use coupling agent, it can be added directly into matrix resin, metal ion is effectively avoided to be caused in resin matrix due to reuniting
The shortcomings that material paintability, bad mechanical property, makes the electromagnetic wave screen paint of preparation not only have preferably electromagnetic wave shielding
Energy, adhesive force.Organosilicon material possesses very low surface energy simultaneously, has good hydrophobic, stain resistant performance, and such material
Si-O bond energys are high in material, and interior Rotation energy barrier is low, makes it have excellent high-low temperature resistant, physiology and chemical inertness.So through poly- two
Coating prepared by methylsiloxane-b- polymethyl methacrylate modified fillers has certain antifouling property.
The coating prepared in aforementioned manners, using conventional cold spray apparatus spraying or using brushing when use, in room temperature
Lower drying and curing.
The present invention has the following advantages：
1, the coating provided to including polyolefin various plastic plates and sheet metal have good attachment
Intensity.
2, thus coating made from coating has good shielding properties to electromagnetic wave.
3, drying and curing carries out at room temperature, energy saving easy to use.
4, the preparation method of coating it is simple, it is easily operated, completely use conventional equipment, it is cost-effective, convenient for promote.
Specific implementation mode
Below in conjunction with specific embodiment, the present invention will be described in detail, but not as a limitation of the invention.
Electromagnetic wave screen paint provided by the invention, by film-forming resin weight be 100 parts in terms of, including：
100 parts of film-forming resin
60~120 parts of nickel powder, preferably 70~110 parts
9~15 parts of stabilizer, preferably 9.5~12 parts
0.6~1.3 part of dispersant, preferably 0.7~1.1 part
45~100 parts of solvent, preferably 50~90 parts
The stabilizer is dimethyl silicone polymer-b- polymethyl methacrylates.
The film-forming resin selects acrylic resin.
The nickel powder is preferably micron order nickel powder, a diameter of 1~10 μm, preferably 2~5 μm.
Nickel powder is added 60~120 parts in 100 parts of film-forming resins in the present invention, is preferably added 70~110 parts, is more than this
Content can then cause the mechanical performance of coating to decline, and coating, which is also easy to produce cracking, falls off, etc. is then not achieved required shielding properties；
And the mechanical performance of coating can be then caused to decline less than this content.
Stabilizer and dispersion dosage is very few that nickel powder cannot be made fully dispersed in system, measured the shielding that can at most make coating
Performance declines.
The dispersant at least selects one kind in organobentonite and silica.
The solvent is in carbon tetrachloride, ethyl acetate, methyl acetate, butyl acetate, acetone, methyl ethyl ketone, ethyl alcohol
It is a kind of.
Stabilizer of the present invention is dimethyl silicone polymer-b- polymethyl methacrylates (PDMS-b-PMMA),
Characteristic chemical structural formula is as follows：
Wherein, n is the degree of polymerization of hydroxy-end capped dimethyl silicone polymer (PDMS-OH), and value 4-1000, m are poly- first
The degree of polymerization of base methyl acrylate (PMMA), value 2000-20000.
The preparation process flow of coating of the present invention is as follows：
1) dimethyl silicone polymer-b- polymethyl methacrylates are mixed with solvent, stirs to obtain poly- two
Methylsiloxane-b- polymethyl methacrylate solutions；2) the poly- methyl of dimethyl silicone polymer-b- is added in dispersant and nickel powder
It is dispersed with stirring in methyl acrylate solution uniformly；3) film-forming resin is added in step acquired solution, is sufficiently stirred dispersion, is made
Coating.
Present invention is further described in detail with reference to embodiments.
Raw material sources：
Nickel powder：Gansu Jinchuan Group Co., Ltd；
Acrylic resin, Hangzhou get Shang Chemical Co., Ltd.s；
Organobentonite (coating use), Weifang development bentonite factory；
Silica, Shandong Jin Neng Science and Technology Ltd.s；
Dimethyl silicone polymer-b- polymethyl methacrylates, Zhejiang University.
Adhesive force is tested：Exist to electromagnetic wave screen paint by GB/T 9286-88 (the drawing lattice experiment of paint and varnish paint film)
Adhesive force on all kinds of planks is measured.
Volume resistivity is tested：Resistivity of the measurement of the volume resistivity of electromagnetic wave shielding coating with reference to electric wire etc.
Test method carries out (GB3048.3-83).
Capability of electromagnetic shielding calculates：
According to the basic principle of electromagnetic wave shielding theory can have been carried out to the shielding properties of electromagnetic wave shielding coating obtained
It calculates, calculation formula is as follows.
SE (dB)=reflection loss (R)+absorption loss (A)+internal loss (B)
=50+10log (1/ ρvf)+1.7t(f/ρv)1/2
ρv：The resistivity (Ω cm) of sample；f：Frequency (the H of electromagnetic wavez)；t：The thickness (cm) of sample.
Wherein, what is played a crucial role for conductor shielding material is reflection loss, and B values can be ignored because too small.
" part " described in embodiment each means parts by weight.
Embodiment 1：
1) by dimethyl silicone polymer-b- polymethyl methacrylates 9.5 parts mixed with 50 parts of ethyl acetate, be sufficiently stirred
Uniformly obtain dimethyl silicone polymer-b- polymethyl methacrylate solutions；2) it is by 0.7 part of organobentonite and 70 parts of grain sizes
5 μm of nickel powder, which is added in dimethyl silicone polymer-b- polymethyl methacrylate solutions, to be dispersed with stirring uniformly；3) by film-forming resin
It is walked in acquired solution in addition, is sufficiently stirred dispersion, coating is made.
Calculating analysis through respective volume resistivity and shielding properties, within the scope of 1MHz~1000MHz, electromagnetic wave shielding
It can reach 52dB in 200 μm of coating layer thickness.Adhesive force is by GB/T 9286-1998 tests up to 1 grade.
Comparative example 1：
1) film-forming resin is added in 50 parts of ethyl acetate and stirs to obtain film-forming resin solution；2) by 0.7
The nickel powder that part organobentonite and 70 parts of grain sizes are 5 μm is added in above-mentioned solution, is sufficiently stirred dispersion, coating is made.
Calculating analysis through respective volume resistivity and shielding properties, within the scope of 1MHz~1000MHz, electromagnetic wave shielding
It can reach 40dB in 200 μm of coating layer thickness.Adhesive force is by GB/T 9286-1998 tests up to 1 grade.
Embodiment 2：
1) by dimethyl silicone polymer-b- polymethyl methacrylates 10 parts mixed with 70 parts of butyl acetates, be sufficiently stirred
Uniformly obtain dimethyl silicone polymer-b- polymethyl methacrylate solutions；2) it is 3 μ by 1.0 parts of silica and 90 parts of grain sizes
The nickel powder of m, which is added in dimethyl silicone polymer-b- polymethyl methacrylate solutions, to be dispersed with stirring uniformly；3) film-forming resin is added
Enter in upper step acquired solution, is sufficiently stirred dispersion, coating is made.
Calculating analysis through respective volume resistivity and shielding properties, within the scope of 1MHz~1000MHz, electromagnetic wave shielding
It can reach 56dB in 200 μm of coating layer thickness.Adhesive force is by GB/T 9286-1998 tests up to 1 grade.
Comparative example 2：
1) film-forming resin is added in 70 parts of butyl acetates and stirs to obtain film-forming resin solution；2) by 1.0
The nickel powder that part silica and 90 parts of grain sizes are 3 μm is added in above-mentioned solution, is sufficiently stirred dispersion, coating is made.
Calculating analysis through respective volume resistivity and shielding properties, within the scope of 1MHz~1000MHz, electromagnetic wave shielding
It can reach 42dB in 200 μm of coating layer thickness.Adhesive force is 2 grades by GB/T 9286-1998 tests.
Embodiment 3：
1) by dimethyl silicone polymer-b- polymethyl methacrylates 10.5 parts mixed with 80 parts of acetone, be sufficiently stirred
It is even to obtain dimethyl silicone polymer-b- polymethyl methacrylate solutions；2) it is 2 by 1.1 parts of organobentonites and 110 parts of grain sizes
μm nickel powder be added dimethyl silicone polymer-b- polymethyl methacrylate solutions in be dispersed with stirring uniformly；3) by film-forming resin
It is walked in acquired solution in addition, is sufficiently stirred dispersion, coating is made.
Calculating analysis through respective volume resistivity and shielding properties, within the scope of 1MHz~1000MHz, electromagnetic wave shielding
It can reach 60dB in 200 μm of coating layer thickness.Adhesive force is by GB/T 9286-1998 tests up to 1 grade.
Comparative example 3：
1) film-forming resin is added in 80 parts of acetone and stirs to obtain film-forming resin solution；2) 1.1 parts are had
The nickel powder that machine bentonite and 110 parts of grain sizes are 2 μm is added in above-mentioned solution, is sufficiently stirred dispersion, coating is made.
Calculating analysis through respective volume resistivity and shielding properties, within the scope of 1MHz~1000MHz, electromagnetic wave shielding
It can reach 46dB in 200 μm of coating layer thickness.Adhesive force is 2 grades by GB/T 9286-1998 tests.
Embodiment 4：
1) by dimethyl silicone polymer-b- polymethyl methacrylates 9.5 parts mixed with 60 parts of carbon tetrachloride, be sufficiently stirred
Uniformly obtain dimethyl silicone polymer-b- polymethyl methacrylate solutions；2) it is by 0.7 part of organobentonite and 70 parts of grain sizes
5 μm of nickel powder, which is added in dimethyl silicone polymer-b- polymethyl methacrylate solutions, to be dispersed with stirring uniformly；3) by film-forming resin
It is walked in acquired solution in addition, is sufficiently stirred dispersion, coating is made.
Calculating analysis through respective volume resistivity and shielding properties, within the scope of 1MHz~1000MHz, electromagnetic wave shielding
It can reach 52dB in 200 μm of coating layer thickness.Adhesive force is by GB/T 9286-1998 tests up to 1 grade.
Comparative example 4：
1) 1.5 parts of titanate coupling agent is added in 60 parts of carbon tetrachloride and stirs to obtain titanate coupling agent
Solution；2) nickel powder that 0.7 part of organobentonite and 70 parts of grain sizes are 5 μm is added in above-mentioned solution, is dispersed with stirring uniformly, 3)
Film-forming resin is added in step acquired solution, dispersion is sufficiently stirred, coating is made.
Calculating analysis through respective volume resistivity and shielding properties, within the scope of 1MHz~1000MHz, electromagnetic wave shielding
It can reach 45dB in 200 μm of coating layer thickness.Adhesive force is by GB/T 9286-1998 tests up to 1 grade.
Embodiment 5：
1) by dimethyl silicone polymer-b- polymethyl methacrylates 10 parts mixed with 70 parts of ethyl alcohol, stir
Obtain dimethyl silicone polymer-b- polymethyl methacrylate solutions；2) it is 3 μm by 1.0 parts of silica and 90 parts of grain sizes
Nickel powder, which is added in dimethyl silicone polymer-b- polymethyl methacrylate solutions, to be dispersed with stirring uniformly；3) film-forming resin is added
In upper step acquired solution, it is sufficiently stirred dispersion, coating is made.
Calculating analysis through respective volume resistivity and shielding properties, within the scope of 1MHz~1000MHz, electromagnetic wave shielding
It can reach 56dB in 200 μm of coating layer thickness.Adhesive force is by GB/T 9286-1998 tests up to 1 grade.
Comparative example 5：
1) 1.5 parts of silane coupling agents are added in 70 parts of ethyl alcohol and stir to obtain film-forming resin solution；2) will
The nickel powder that 1.0 parts of silica and 90 parts of grain sizes are 3 μm is added in above-mentioned solution, is dispersed with stirring uniformly, 3) by film-forming resin
It is walked in acquired solution in addition, is sufficiently stirred dispersion, coating is made.
Calculating analysis through respective volume resistivity and shielding properties, within the scope of 1MHz~1000MHz, electromagnetic wave shielding
It can reach 48dB in 200 μm of coating layer thickness.Adhesive force is 1 grade by GB/T 9286-1998 tests.
Embodiment 6：
1) by dimethyl silicone polymer-b- polymethyl methacrylates 11 parts mixed with 90 parts of butyl acetates, be sufficiently stirred
Uniformly obtain dimethyl silicone polymer-b- polymethyl methacrylate solutions；2) by 1.1 parts of organobentonites and 110 parts of grain sizes
It is added in dimethyl silicone polymer-b- polymethyl methacrylate solutions and is dispersed with stirring uniformly for 2 μm of nickel powders；3) film forming is set
Fat is added in step acquired solution, is sufficiently stirred dispersion, coating is made.
Calculating analysis through respective volume resistivity and shielding properties, within the scope of 1MHz~1000MHz, electromagnetic wave shielding
It can reach 60dB in 200 μm of coating layer thickness.Adhesive force is by GB/T 9286-1998 tests up to 1 grade.
Comparative example 6：
1) 1.2 parts of silane coupling agents are added in 90 parts of ethyl alcohol and stir to obtain film-forming resin solution；2) will
The nickel powder that 1.1 parts of organobentonites and 90 parts of grain sizes are 2 μm is added in above-mentioned solution, is dispersed with stirring uniformly, 3) film forming is set
Fat is added in step acquired solution, is sufficiently stirred dispersion, coating is made.
Calculating analysis through respective volume resistivity and shielding properties, within the scope of 1MHz~1000MHz, electromagnetic wave shielding
It can reach 51dB in 200 μm of coating layer thickness.Adhesive force is 2 grades by GB/T 9286-1998 tests.
Certainly, the present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, ripe
It knows those skilled in the art and makes various corresponding change and deformations, but these corresponding changes and change in accordance with the present invention
Shape should all belong to the protection domain of appended claims of the invention.
Claims (10)
1. a kind of electromagnetic wave screen paint, which is characterized in that by film-forming resin weight be 100 parts in terms of, including：Film-forming resin 100
Part, 60~120 parts of nickel powder, 9~15 parts of stabilizer, 0.6~1.3 part of dispersant, 45~100 parts of solvent, the stabilizer is poly-
Dimethyl siloxane-b- polymethyl methacrylates；The preparation method of the electromagnetic wave screen paint includes：
1) dimethyl silicone polymer-b- polymethyl methacrylates are mixed with solvent, stirs to obtain poly dimethyl
Siloxanes-b- polymethyl methacrylate solutions；
2) dispersant and nickel powder are added in dimethyl silicone polymer-b- polymethyl methacrylate solutions and are dispersed with stirring uniformly；
3) film-forming resin is added in step acquired solution, is sufficiently stirred dispersion, the electromagnetic wave screen paint is made.
2. electromagnetic wave screen paint according to claim 1, which is characterized in that the film-forming resin is acrylic resin.
3. electromagnetic wave screen paint according to claim 1, which is characterized in that the nickel powder is micron order nickel powder.
4. electromagnetic wave screen paint according to claim 1, which is characterized in that a diameter of 1~10 μm of the nickel powder.
5. electromagnetic wave screen paint according to claim 1, which is characterized in that a diameter of 2~5 μm of the nickel powder.
6. electromagnetic wave screen paint according to claim 1, which is characterized in that the nickel powder addition is 70~110 parts.
7. electromagnetic wave screen paint according to claim 1, which is characterized in that the addition of the stabilizer be 9.5~
12 parts.
8. electromagnetic wave screen paint according to claim 1, which is characterized in that the dispersant addition is 0.7~1.1
Part.
9. electromagnetic wave screen paint according to claim 1, which is characterized in that the dispersant at least selects organic swelling
One kind in soil and silica.
10. electromagnetic wave screen paint according to claim 1, which is characterized in that the solvent is carbon tetrachloride, acetic acid second
One kind in ester, methyl acetate, butyl acetate, acetone, methyl ethyl ketone, ethyl alcohol.
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| CN106189594A (en) * | 2016-07-28 | 2016-12-07 | 苏州明轩地坪涂料有限公司 | A kind of high-efficiency electromagnetic shielding coating |
| CN107793863A (en) * | 2017-10-24 | 2018-03-13 | 安徽迈高化工科技有限公司 | A kind of electrically-conducting paint of stable performance |
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| CN103333574B (en) * | 2013-06-25 | 2016-03-09 | 丹阳市佳美化工有限公司 | Anti-shielding conductive coating |
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