CN103087574B - Electromagnetic shielding filling material and preparation method thereof, and electromagnetic shielding paint - Google Patents
Electromagnetic shielding filling material and preparation method thereof, and electromagnetic shielding paint Download PDFInfo
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- CN103087574B CN103087574B CN201110331526.4A CN201110331526A CN103087574B CN 103087574 B CN103087574 B CN 103087574B CN 201110331526 A CN201110331526 A CN 201110331526A CN 103087574 B CN103087574 B CN 103087574B
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Abstract
The invention provides an electromagnetic shielding filling material which is in a core-shell structure and comprises an inner core, a first shell covered on the inner core and a second shell covered on the first shell, wherein the inner core is a magnetic conductive material, the first shell is silver or copper and the second shell is a polyacetylene layer. The invention also provides a preparation method of the electromagnetic shielding filling material, and an electromagnetic shielding paint employing the electromagnetic shielding filling material. The electromagnetic shielding filling material provided by the invention has dual-function of magnetic conductivity and electric conductivity, and at the same time, the outer layer is a conductive polymer, so that the electromagnetic shielding filling material has good dispersibility and electromagnetic shielding performance.
Description
Technical field
The invention belongs to electromangnetic spectrum field, relate in particular to a kind of electromagnetic shielding filler and preparation method thereof and a kind of electromagnetic screen coating.
Background technology
Electromagnetic screen coating is that specific conductivity is 10
-10scm
-1above, there is the coating of conduction current and eliminating accumulate static charge ability.This coating generally contains matrix resin, solvent and conductive filler material, can on base material, form coating for EMI shielding.Coating for EMI shielding on the one hand can prevent the interference of electromagenetic wave radiation to electronic product signal in environment, makes the signal fidelity, stable of electronic product; Can prevent that on the other hand electronic product from polluting the electromagenetic wave radiation of environment, makes the signal security of electronic product.This coating is as a kind of fluid materials, have preparation method simple, with low cost, can spray easily or brush the surface of plastic products in different shape, form the coating for EMI shielding of conduction, thereby reach the object of electromagnetic wave shielding, be widely used in the field such as electronic component and wiring board printing, construction industry, transport and military affairs, aerospace.
For example, in CN101210124A, disclose a kind of electrically conducting coating, comprised following component: filmogen 30-55%, electrically conducting coating auxiliary agent 1-10%, mixed diluent 40-69%; Wherein, filmogen comprises metal-powder and single-component resin, and metal-powder is silver powder, copper powder or its combination, and the content of metal-powder is 15-30%; Resin is selected from the one in novolac epoxy, acrylic resin, Synolac.But this electrically conducting coating can not have the dual-use function of conduction, magnetic conduction concurrently, conductive powder body is difficult to dispersed with filmogen in coating simultaneously.
Summary of the invention
The invention solves the electrically conducting coating existing in prior art and can not have conduction, magnetic conduction dual-use function concurrently, in coating, conductive powder body and matrix resin are difficult to homodisperse technical problem simultaneously.
The invention provides a kind of electromagnetic shielding filler, described electromagnetic shielding filler is nucleocapsid structure, comprises successively from the inside to the outside kernel, is coated on the first shell on kernel and is coated on the second shell on the first shell; Described kernel is magnetically permeable material, and the first shell is silver or copper, and the second shell is polyacetylene layer.
The present invention also provides the preparation method of described electromagnetic shielding filler, comprises the following steps:
In A, alkali electroless plating solution that magnetically permeable material be impregnated in, form electroless plating silver layer or chemical plating copper layer on described magnetically permeable material surface; Described alkali electroless plating solution is alkali electroless silver plating liquid or alkaline chemical copper plating liquid;
B, the product that steps A is obtained are placed in the emulsion system that contains acetylene, emulsifying agent and catalyzer, and wherein catalyzer is Ziegler-Natta catalyst, obtain described electromagnetic shielding filler after reaction.
Finally, the invention provides a kind of electromagnetic screen coating, in described electromagnetic screen coating, contain film-forming resin, filler, solvent, coupling agent and dispersion agent; Wherein, described filler is electromagnetic shielding filler provided by the invention.
Electromagnetic shielding filler provided by the invention is nucleocapsid structure, wherein kernel is magnetically permeable material, the first shell is conducting metal (being silver or copper), outer is conductive polymers (being polyacetylene layer), make electromagnetic shielding filler of the present invention have the dual-use function of magnetic conduction, conduction concurrently, film-forming resin in outer field polyacetylene layer and electromagnetic screen coating has good consistency simultaneously, makes electromagnetic screen coating of the present invention have good dispersiveness and capability of electromagnetic shielding.In the preparation method of electromagnetic shielding filler provided by the invention; by forming electroless plating silver layer or chemical plating copper layer on magnetically permeable material surface; then in synthetic polyacetylene, realize the coated of polyacetylene; harsh one-tenth polyacetylene has higher activity; it is very easily adsorbed on the chemical silvering particle or copper particle equally with greater activity; the silver or the copper that ensure polyacetylene and the first shell have good sticking power, thereby prepare electromagnetic shielding filler of the present invention.
Brief description of the drawings
Fig. 1 is the structural representation of a kind of embodiment of electromagnetic screen coating provided by the invention.
Fig. 2 is the structural representation of the another kind of embodiment of electromagnetic screen coating provided by the invention.
Embodiment
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearer, below in conjunction with accompanying drawing, the present invention is further elaborated.
The invention provides a kind of electromagnetic shielding filler, described electromagnetic shielding filler is nucleocapsid structure, has structure as shown in Figure 1 or 2, comprises successively from the inside to the outside kernel 1, is coated on the first shell 2 on kernel 1 and is coated on the second shell 3 on the first shell 2.
Wherein, described kernel 1 is magnetically permeable material, ensures that electromagnetic screen coating of the present invention has good magnetic diffusivity.The first shell 2 is silver or copper, ensures that electromagnetic screen coating of the present invention has good electroconductibility.The second shell 3 is polyacetylene layer, it is conductive polymers, on the one hand ensure that electromagnetic screen coating of the present invention has good electroconductibility, itself and film-forming resin have good consistency on the other hand, and the filler in electromagnetic screen coating of the present invention is can be uniformly dispersed.
Electromagnetic shielding filler provided by the invention is nucleocapsid structure, wherein kernel 1 is magnetically permeable material, the first shell 2 is conducting metal (being silver or copper), outer is conductive polymers (being polyacetylene layer), make electromagnetic shielding filler of the present invention have the dual-use function of magnetic conduction, conduction concurrently, film-forming resin in outer field polyacetylene layer and electromagnetic screen coating has good consistency simultaneously, makes electromagnetic screen coating of the present invention have good dispersiveness and capability of electromagnetic shielding.
As one embodiment of the present invention, described magnetically permeable material is magnetic fibre, and kernel 1 is magnetic fibre; Now, the structure of described electromagnetic shielding filler as shown in Figure 1.Under preferable case, the length of described magnetic fibre is 1 μ m-500 μ m, and Fibre diameter is 10nm-20 μ m.Described magnetic fibre can adopt various magnetic fiber materials common in prior art, for example, can be selected from nickel fiber, Fe
3o
4one in fiber or ferrite doped calcium fiber.In described ferrite doped calcium fiber, doped element is Mn, Mg, Zn or Ba.More preferably in situation, the ferrite in described ferrite doped calcium fiber is for removing Fe
3o
4outside other ferrite.
As another embodiment of the invention, described magnetically permeable material is magnetic-particle, and kernel 1 is magnetic-particle; Now, the structure of described electromagnetic shielding filler as shown in Figure 2.Under preferable case, the particle diameter of described magnetic-particle is 10nm-500 μ m.Described magnetic-particle can adopt various magnetic-particles common in prior art, for example, can be selected from metallic nickel magnetic-particle, ferrite magnetic particle or ferro-aluminum boron magneticalloy particle a kind of.
In the present invention, the thickness of the first shell 2, the second shell 3 is without excessive.Under preferable case, the thickness of described the first shell 2 is 10nm-50 μ m, and the thickness of the second shell 3 is 10nm-30 μ m.
Taking the total mass of described electromagnetic shielding filler as benchmark, the content of kernel 1 is 30-90wt%, and the content of the first shell 2 is 5-50wt%, and the content of the second shell 3 is 5-20wt%.Under preferable case, taking the total mass of described electromagnetic shielding filler as benchmark, the content of kernel 1 is 42-60wt%, and the content of the first shell 2 is 25-40wt%, and the content of the second shell 3 is 8-20wt%.
The present invention also provides the preparation method of described electromagnetic shielding filler, comprises the following steps:
In A, alkali electroless plating solution that magnetically permeable material be impregnated in, form electroless plating silver layer or chemical plating copper layer on described magnetically permeable material surface; Described alkali electroless plating solution is alkali electroless silver plating liquid or alkaline chemical copper plating liquid;
B, the product that steps A is obtained are placed in the emulsion system that contains acetylene, emulsifying agent and catalyzer, and wherein catalyzer is Ziegler-Natta catalyst, obtain described electromagnetic shielding filler after reaction.
In the preparation method of electromagnetic shielding filler provided by the invention, by form the chemical plating of conducting metal (silver or copper) on magnetically permeable material surface, then in synthetic polyacetylene, realize the coated of polyacetylene, harsh one-tenth polyacetylene has higher activity, it is very easily adsorbed on the chemical silvering or electroless copper particle equally with greater activity, the silver or the copper that ensure polyacetylene and the first shell have good sticking power, thereby obtain electromagnetic shielding filler of the present invention.
Particularly, contain metal host, complexing agent, reductive agent, the agent of suction hydrogen and alkaline reagents in described alkali electroless plating solution, described metal host is water soluble silver salt or water-soluble mantoquita.In the present invention, complexing agent in described alkali electroless plating solution, encircle former dose, inhale hydrogen agent and alkaline reagents all can adopt various raw materials conventional in prior art, the present invention does not have singularity to limit.
For example, described complexing agent can be selected from nitrilotriacetic acid(NTA) sodium (NTA), edetate (EDETATE SODIUM or four sodium), diethylenetriamine pentacarboxylic acid salt (DTPA), tartrate, heptose hydrochlorate, Sunmorl N 60S, sodium alginate, monoethanolamine, diethanolamine, trolamine, tripoly phosphate sodium STPP, trisodium phosphate, Sodium hexametaphosphate 99, ethylenediamine tetraacetic methene sodium phosphate (EDTMPS), diethylene triamine pentamethylene phosphonic salt (DETPMPS) or amine three methene phosphoric acid salt.Described reductive agent is selected from hydrazine hydrate, glucose, sucrose, fructose or formaldehyde.The agent of described suction hydrogen is selected from nitro methyl alcohol, 2,4-DNP, p-NP or contraposition phenylate.Described alkaline reagents is selected from ammoniacal liquor, sodium hydroxide or potassium hydroxide.
As previously mentioned, the present invention is not particularly limited for other component in alkali electroless plating solution, the present invention is only metal host to the restriction of described alkali electroless plating solution, selects its corresponding water-soluble metal salt as the metal host in alkali electroless plating solution according to the conductive metallic material of the first shell (silver or copper).Particularly, described metal host is water-soluble mantoquita or water soluble silver salt.Wherein, described water soluble silver salt can adopt Silver Nitrate.Described water-soluble mantoquita can adopt copper sulfate, cupric chloride or cupric nitrate.
In the present invention, magnetically permeable material be impregnated in to the time of carrying out electroless plating in alkali electroless plating solution, can suitably select according to the thickness of the first shell of required formation.For example, the thickness of described the first shell is 10nm-50 μ m, and the time of electroless plating can be 10min-5h.
The method according to this invention, after electroless plating completes, at the coated electroless plating silver layer in magnetically permeable material surface or chemical plating copper layer, then be placed in the emulsion system that contains acetylene, emulsifying agent and catalyzer,, when acetylene polymerization reaction take place forms polyacetylene, realize the coated of chemical plating surface polyacetylene.Because the silver-colored particle or the copper particle that just form by electroless plating have higher activity; and there is equally higher activity by the new synthetic polyacetylene of polymerization; therefore it is very easily adsorbed in silver-colored particle or copper particle surface; thereby realize the coated process of polyacetylene to the first shell, obtain having the electromagnetic shielding filler of structure shown in Fig. 1 or Fig. 2.
In the present invention, the preparation method of polyacetylene is conventionally known to one of skill in the art, in the present invention, is only: generate magnetic conduction particle coated of realizing its effects on surface chemical silvering or copper in polyacetylene in polymerization.Particularly, in the present invention, described emulsifying agent can adopt sodium lauryl sulphate.Described Ziegler-Natta catalyst is conventionally known to one of skill in the art, is the mixture of the first catalyzer and the second catalyzer.Wherein said the first catalyzer is selected from TiCl
4, TiCl
3or Ti (OR)
4in any one, and the second catalyzer is AlR
3, wherein R is alkyl.In the present invention, be not particularly limited for the temperature and time of the building-up reactions of described polyacetylene.For example, reaction can directly be carried out at normal temperatures, and the reaction times is 2-10h.
Finally, the invention provides a kind of electromagnetic screen coating, in described electromagnetic screen coating, contain film-forming resin, filler, thinner, coupling agent and dispersion agent; Wherein, described filler is electromagnetic shielding filler provided by the invention.
In electromagnetic screen coating provided by the invention, the contamination of described film-forming resin, coupling agent, dispersion agent is conventionally known to one of skill in the art, and the present invention is not particularly limited.For example, described film-forming resin can be selected from one or more in epoxy resin, acrylic resin, resol and vibrin.Described coupling agent can be selected from titante coupling agent or silane coupling agent, and dispersion agent can adopt organobentonite.
Particularly, taking the film-forming resin of 100 weight parts as benchmark, in described electromagnetic screen coating, the content of filler is 90-200 weight part, and the content of coupling agent is 0.2-1 weight part, and the content of dispersion agent is 0.5-5 weight part.
Described thinner is for regulating the viscosity of described electromagnetic screen coating.Therefore, the content of thinner can carry out corresponding selection according to actual needs.Described thinner is various organic solvents conventional in prior art, for example, can be selected from one or more in N-BUTYL ACETATE, tetracol phenixin, ethyl acetate.
Below in conjunction with specific embodiment, the present invention is further explained to explanation.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.In embodiment and comparative example, the raw material that adopts is all commercially available.
Embodiment 1
(1) 3.5g Silver Nitrate, 4g tartrate, 45g glucose, 2.5g sodium hydroxide, 5mL ammoniacal liquor and 0.15g p-NP are scattered in 60mL deionized water, obtain alkali electroless silver plating liquid.
(2) by 100g nickel fiber, (length is 50 μ m, and diameter is that 0.5 μ m) impregnated in 50min in alkali electroless silver plating liquid, and forming thickness at nickel fiber surface is 20 μ m electroless plating silver layers (46.67g); Then impregnated in and contain acetylene, sodium lauryl sulphate, TiCl
4and Al (C
2h
5)
3emulsion system in, under normal temperature, react 4h, after on electroless plating silver layer surface, coated thickness is the polyacetylene layer (20.00g) of 10 μ m, obtain the electromagnetic shielding filler S1 of the present embodiment, there is structure shown in Fig. 1.
(3) silane coupling agent of 1 weight part is dispersed in the thinner (ethyl acetate) of 30 weight parts, then add electromagnetic shielding filler S1, the film-forming resin (resol) of 100 weight parts and the dispersion agent (organobentonite) of 3 weight parts of 96 weight parts, stir and obtain the electromagnetic screen coating of the present embodiment, be designated as S10.
Embodiment 2
Adopt the step identical with embodiment 1 to prepare electromagnetic shielding filler S2 and the electromagnetic screen coating S20 of the present embodiment, difference is:
In step (1), adopt alkaline chemical copper plating liquid to replace the alkali electroless silver plating liquid in embodiment 1, the component of alkaline chemical copper plating liquid is: CuSO
45H
2o 0.12mol/L, Na
2eDTA2H
2o 0.14mol/L, formaldehyde 10mg/L, 2,4-DNP 15mg/L, and to regulate pH value with NaOH be 12.5.
Embodiment 3
Adopt the step identical with embodiment 1 to prepare electromagnetic shielding filler S3 and the electromagnetic screen coating S30 of the present embodiment, difference is:
In step (2), the thickness of electroless plating silver layer is 10 μ m, and quality is 17.50g; The thickness of polyacetylene layer is 5 μ m, and quality is 7.50g.
Embodiment 4
Adopt the step identical with embodiment 2 to prepare structure shown in electromagnetic shielding filler S4(Fig. 2 of the present embodiment) and electromagnetic screen coating S40, difference is:
In step (2), adopting particle diameter is the nickel fiber in ferro-aluminum boron magneticalloy particle (100g) alternate embodiment 2 of 20 μ m.
Embodiment 5
Adopt the electromagnetic shielding filler S1 preparing with embodiment 1 to prepare electromagnetic screen coating S50 of the present invention, specifically comprise: the silane coupling agent of 1 weight part is dispersed in the thinner (ethyl acetate) of 50 weight parts, then the electromagnetic shielding filler, the resol of 100 weight parts and the dispersion agent (organobentonite) of 5 weight parts that add 200 weight parts, stir and obtain the electromagnetic screen coating S50 of the present embodiment.
Embodiment 6
Adopt the electromagnetic shielding filler S2 preparing with embodiment 2 to prepare electromagnetic screen coating S60 of the present invention, specifically comprise: the silane coupling agent of 1 weight part is dispersed in the thinner (ethyl acetate) of 20 weight parts, then the electromagnetic shielding filler, the resol of 100 weight parts and the dispersion agent (organobentonite) of 5 weight parts that add 150 weight parts, stir and obtain the electromagnetic screen coating S60 of the present embodiment.
Comparative example 1
Adopt the disclosed formula of embodiment 2 and the disclosed preparation method of embodiment 5 in CN101210124A, prepare the electrically conducting coating of this comparative example, be designated as DS10.
Performance test:
1, electromagnetic shielding filler sticking power test:
Adopt the disclosed method of GB/T 9286-1998 to carry out sticking power test to electromagnetic shielding filler sample S1-S4, test result is as shown in table 1.
Table 1
| Packing samples | S1 | S2 | S3 | S4 |
| Sticking power | 1 grade | 1 grade | 1 grade | 1 grade |
2, the dispersed test of coating
Adopt the method for GB/T 5540-2007 to carry out dispersiveness test to electromagnetic screen coating sample S10-S60 and DS10, test result is as shown in table 2.
3, coating volume specific resistance test
Adopt the method for GB/T 16906-1997 to carry out volume specific resistance test to electromagnetic shielding sample S10-S60 and DS10, test result is as shown in table 2.
4, shielding properties test:
Adopt the method for SJ50524-1995 in 100-1.5 × 10
9in the range of frequency of KHz, electromagnetic shielding sample S10-S60 and DS10 are carried out to capability of electromagnetic shielding test, test result is as shown in table 2.
Table 2
。
Test result by table 1 can find out, in electromagnetic shielding filler provided by the invention, the first shell, the second shell and kernel have higher sticking power.
Test result by table 2 can be found out, adopts the electromagnetic screen coating of electromagnetic shielding filler provided by the invention to have good dispersing uniformity; Coating volume specific resistance is lower than 104 Ω m, at 100-1.5x10 simultaneously
9in the range of frequency of KHz, electromagnet shield effect is 28-55dB, illustrates that electromagnetic screen coating of the present invention has good capability of electromagnetic shielding.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (12)
1. an electromagnetic shielding filler, is characterized in that, described electromagnetic shielding filler is nucleocapsid structure, comprises successively from the inside to the outside kernel, is coated on the first shell on kernel and is coated on the second shell on the first shell; Described kernel is magnetically permeable material, and the first shell is silver or copper, and the second shell is polyacetylene layer.
2. electromagnetic shielding filler according to claim 1, is characterized in that, described magnetically permeable material is magnetic fibre or magnetic-particle; Described magnetic fibre is selected from nickel fiber, Fe
3o
4one in fiber and ferrite doped calcium fiber, doped element is Mn, Mg, Zn or Ba; Described magnetic-particle is selected from the one in metallic nickel magnetic-particle, ferrite magnetic particle or ferro-aluminum boron magneticalloy particle.
3. electromagnetic shielding filler according to claim 2, is characterized in that, the length of described magnetic fibre is 1 μ m-500 μ m, and Fibre diameter is 10nm-20 μ m; The particle diameter of described magnetic-particle is 10nm-500 μ m.
4. electromagnetic shielding filler according to claim 1, is characterized in that, the thickness of described the first shell is 10nm-50 μ m, and the thickness of the second shell is 10nm-30 μ m.
5. electromagnetic shielding filler according to claim 1, is characterized in that, taking the total mass of described electromagnetic shielding filler as benchmark, the mass percent of kernel is 30-90%, and the mass percent of the first shell is 5-50%, and the mass percent of the second shell is 5-20%.
6. the preparation method of electromagnetic shielding filler claimed in claim 1, comprises the following steps:
A, magnetically permeable material be impregnated in alkali electroless plating solution, form electroless plating silver layer or chemical plating copper layer on described magnetically permeable material surface; Described alkali electroless plating solution is alkali electroless silver plating liquid or alkaline chemical copper plating liquid;
B, the product that steps A is obtained are placed in the emulsion system that contains acetylene, emulsifying agent and catalyzer, and wherein catalyzer is Ziegler-Natta catalyst, obtain described electromagnetic shielding filler after reaction.
7. preparation method according to claim 6, is characterized in that, contains metal host, complexing agent, reductive agent, the agent of suction hydrogen and alkaline reagents in described alkali electroless plating solution, and described metal host is water soluble silver salt or water-soluble mantoquita.
8. preparation method according to claim 7, is characterized in that, described metal host is selected from Silver Nitrate, copper sulfate, cupric chloride or cupric nitrate; Described complexing agent is selected from nitrilotriacetic acid(NTA) sodium, edetate, diethylenetriamine pentacarboxylic acid salt, tartrate, heptose hydrochlorate, Sunmorl N 60S, sodium alginate, monoethanolamine, diethanolamine, trolamine, tripoly phosphate sodium STPP, trisodium phosphate, Sodium hexametaphosphate 99, ethylenediamine tetraacetic methene sodium phosphate, diethylene triamine pentamethylene phosphonic salt or amine three methene phosphoric acid salt; Described reductive agent is selected from hydrazine hydrate, glucose, sucrose, fructose or formaldehyde; The agent of described suction hydrogen is selected from nitro methyl alcohol, 2,4-DNP, p-NP or contraposition phenylate; Described alkaline reagents is selected from ammoniacal liquor, sodium hydroxide or potassium hydroxide.
9. preparation method according to claim 6, is characterized in that, described emulsifying agent is sodium lauryl sulphate; Described Ziegler-Natta catalyst is the mixture of the first catalyzer and the second catalyzer, and wherein the first catalyzer is selected from TiCl
4, TiCl
3or Ti (OR)
4in any one, the second catalyzer is AlR
3, R is alkyl.
10. an electromagnetic screen coating, is characterized in that, contains film-forming resin, filler, thinner, coupling agent and dispersion agent in described electromagnetic screen coating; Described filler is the electromagnetic shielding filler described in claim 1-5 any one.
11. electromagnetic screen coatings according to claim 10, it is characterized in that, taking the film-forming resin of 100 weight parts as benchmark, in described electromagnetic screen coating, the content of filler is 90-200 weight part, the content of coupling agent is 0.2-1 weight part, and the content of dispersion agent is 0.5-5 weight part.
12. according to the electromagnetic screen coating described in claim 10 or 11, it is characterized in that, described film-forming resin is selected from one or more in epoxy resin, acrylic resin, resol and vibrin; Described coupling agent is selected from titante coupling agent or silane coupling agent, and dispersion agent is selected from organobentonite; Described thinner is selected from one or more in N-BUTYL ACETATE, tetracol phenixin, ethyl acetate.
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| CN201110331526.4A CN103087574B (en) | 2011-10-27 | 2011-10-27 | Electromagnetic shielding filling material and preparation method thereof, and electromagnetic shielding paint |
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| CN103436013B (en) * | 2013-08-30 | 2015-07-29 | 西北工业大学 | A kind of preparation method of polyaniline/sliver-cferriteobalt ferriteobalt composite material |
| CN105655091A (en) * | 2014-10-23 | 2016-06-08 | 国家电网公司 | Low frequency transformer shielding layer |
| PL236147B1 (en) * | 2014-12-10 | 2020-12-14 | Selena Labs Spolka Z Ograniczona Odpowiedzialnoscia | Composition for impregnating materials and giving them the ability to shield variable magnetic field, its application for coating/impregnating of a matrix with fibrous and/or porous structure and the materials containing them |
| CN104951009B (en) * | 2015-07-01 | 2018-05-29 | 任剑岚 | For the electromagnetic shielding window of computer |
| CN105017948A (en) * | 2015-08-05 | 2015-11-04 | 普罗旺斯科技（深圳）有限公司 | Wave absorbing sheet and manufacturing method thereof |
| WO2017070843A1 (en) * | 2015-10-27 | 2017-05-04 | Henkel Ag & Co. Kgaa | A conductive composition for low frequency emi shielding |
| CN106830910A (en) * | 2016-12-21 | 2017-06-13 | 马鞍山起劲磁塑科技有限公司 | A kind of preparation method of strontium ferrite magnetic powder |
| CN106634311A (en) * | 2016-12-29 | 2017-05-10 | 宁波墨西科技有限公司 | Modified graphene electromagnetic shielding paint and preparation method thereof |
| CN107841177A (en) * | 2017-10-30 | 2018-03-27 | 汪涛 | A kind of conducting paint composite |
| CN108441011A (en) * | 2018-02-01 | 2018-08-24 | 东莞市佳乾新材料科技有限公司 | A kind of aqueous epoxy resins type electromagnetic screen coating and preparation method thereof |
| CN108384422B (en) * | 2018-03-28 | 2020-06-02 | 中车青岛四方机车车辆股份有限公司 | Low-frequency electromagnetic shielding coating for railway vehicle and preparation method thereof |
| CN109576686A (en) * | 2019-01-11 | 2019-04-05 | 江门市德商科佐科技实业有限公司 | A kind of additive enhancing chemical nickel-plating solution stability |
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