CN101372564A - Radio frequency electromagnetic impedance match anti-electromagnetic interference composite coating, preparation and spray coating method - Google Patents

Abstract

The invention discloses a radio-frequency electromagnetic impedance matching anti-electromagnetic interference composite coating, a preparation method and a spraying method thereof. The impedance matching coating consists of a resin solution, nano-beta silicon carbide, nano-nickel powder and polystyrene; the bottom black carbon coating consists of the resin solution and black carbon. The preparation method comprises solution preparation, resin dissolution, preparation of the impedance matching coating and preparation of the bottom black carbon coating. The spraying method is as follows: the bottom black carbon coating is first sprayed, and then the impedance matching coating is sprayed, both the coatings are dried at the temperature of 60-75 DEG C for 30min to obtain the radio-frequency electromagnetic impedance matching anti-electromagnetic interference composite coating. The coating obtained has the advantages of high electromagnetic impedance matching, strong anti-electromagnetic interference ability, wide absorption band, high absorptivity, little reflection, low RFID misreading rate, no secondary electromagnetic pollution, etc. The coating effectively solves the problem that signal transduction is interfered in and attenuated when electric waves meet metal or liquid in the RFID application, and further the reliability and accuracy of data reading are affected, thus the coating greatly expands the application field of the RFID, and can be widely used in various fields of radio frequency.

Description

Radio frequency electromagnetic impedance match anti-electromagnetic interference composite coating and preparation and spraying method

Technical field

The present invention relates to a kind of coating and preparation and spraying method, be specifically related to radio frequency electromagnetic impedance match anti-electromagnetic interference composite coating and preparation and spraying method.

Background technology

(Radio Frequency Identification RFID) refers to that promptly using radio frequency identification signal discerns target compound to RF identification.REID is a kind of technology of built-in radio chip, can store a series of information in the chip.The volume of RF identification product can be accomplished minimum, and can be attached on the entity that need distinguish, reads its storage information fast in non-contacting mode.With respect to traditional bar code system, the advantage that RFID has comprises: the storage data are read-write, and profile is easy to miniaturization and variation, and is environment resistant, reusable, and it is big etc. that the information transmission has penetrance and an information storage.The RFID Application Areas is very extensive, and its largest benefit is that integral body has improved Item Management efficient, has wider application space and the efficient of Geng Gao than bar code system.

RFID market development present situation

Rose in 2004, international business's medium such as " Business Week " are competitively reported wireless radio-frequency, and some market analysis mechanisms have classified it as one of big important technology project in this century 10.The Industrial Technology Research Institute of Taiwan analyzes, in the period of 2002～2008, RFID market growth, the whole world comprises: electronic tag is increased to 75,000,000,000 yuan from annual 20000000000 yuan of New Taiwan Currencies, reader is increased to 33,000,000,000 yuan from annual 9100000000 yuan, application software is increased to 30,000,000,000 yuan from annual 12100000000 yuan, the RFID market gross output value is increased to 1,380 hundred million yuan from 41,100,000,000 yuan of every year, and annual average compound growth rate is 22%.To this, ABI research has carried out the growth analysis at different industries.

The average annual compound rate of growth in table 1 every profession and trade market

Industry	2002 incomes (1,000,000 dollars)	2008 incomes (1,000,000 dollars)	Annual average compound growth rate
				Automobile	561.8	1084.8	11％
The consumer packing business	9.3	343.1	82％
				Retail	19.3	546.1	74％
National defence	19.6	178	44％
				Transportation	183.2	585	21％
Security protection	66	300.2	29％
				Production	101	293.9	19％
Life science	13.4	46.5	23％
				Other	180.6	401.3	14％

From last table data as can be seen, automobile industry occupy the first in global RFID industry application market.RFID product and be embedded in rfid system on the automobile making platform is usually as the main means of supply chain and asset management.In addition, AVI (automobile is discerned automatically) system also is the potentiality market of RFID as ETC (vehicle electric Fare Collection System), E-Plate (electronic license plate), Tire Tracking (tire tracking), Vehicle Immobilization (the vehicle electric chip is anti-to be started).

(Consumer Packaged Goods is the industry that needs are handled shiploads of merchandise CPG) to the consumer packing business, and CPG manufacturers must cooperate with the retailer, reduces stock and circulation cost jointly.In retail trade, not only comprise the application of RFID retail shop, intelligent commodity shelf, also comprise logistic management system in retail shop and the enterprise (Point-of-sale, POS), application such as supply chain rear end, closed inventory management system.In the national defence industry, RFID mainly focuses on the application in the logistics supply system.After SARS epidemic situation outburst in 2003, RFID obtains aspect hospital application and develops rapidly.The application testing of aspects such as at present, many hospitals carry out with RFID solution provider that pharmaceuticals management, contact patients history, patient status's identification, plant and instrument are followed the trail of, drug for injection management, doctor's advice monitoring, medical error prevent, the mistake of the quality monitoring of blood bag, pharmacy procedure prevents.

The RFID application extension has become the important content of countries in the world IT technical development, below lifts representative country and Taiwan and carries out brief description.

1, the U.S.

United States food and drug administration announced in February, 2000, will introduce the RFID technology and carry out medicine true and false track identification; Kus kretail industry giant Wal-Mart company announces, will preceding 100 big suppliers begin to adopt RFID under requirement in January, 2005, plays all suppliers and will be suitable for comprehensively in 2006; The armament merchant imported RFID surplus U.S. Department of Defense required 40,000 in 2005; Customs, transportation division promote the counter safety program with RFID; An animal tag identification development team has been set up in the Ministry of Agriculture, has worked out RFID animal identification identification way.

2, Japan

Japanese government began to promote the guiding application of RFID of four industries in 2003, comprise household electrical appliances, dress ornament, bibliogony and food circulation industry, and was developed to 10 industries in 2004 yearly plans.Japan's multiparity is economized and has been set up " commodity tracing operations research meeting ", RFID is used with technological standard study.Because Japan is one of important exporting country of electronic industry, therefore in its RFID promotion policy, comprise the electronic label technology research and development, the common standard of open UHF frequency spectrum, and hope becomes contents such as international standard.

3, Singapore

Singapore takes the lead in importing RFID respectively and uses in systems such as highway electronic charging, Library services, hospital personnel tracking.Singapore information communication development office drops into 1,000 ten thousand new coin, estimates to finish 5 RFID supply chain systems in 2006, plays an active part in the formulation work of international standard simultaneously.

4, Taiwan

In March, 2004, " RFID research and development and industry are used alliance " set up in Taiwan.64 tame Taiwan manufacturer and research units such as institute are ground in conjunction with Qing Kang, light treasured, special power, smart industry, worker by this alliance, to strengthen RFID product design, exploitation, volume production and system applies ability, promote Taiwan RFID industry development.Economy of taiwan portion Departmnet of Commerce and Industrial Development Bureau release S plan and R plan jointly: the S plan is to promote big logistics alliance plan, it will be mark post with Singapore, except that ways such as port infrastructure construction, coalition of companies's award are provided, also comprise contents such as revising Taiwan logistics responsibility and insurance regulation.R plan is the research and development plan that promotes the RFID platform service energetically, all can carry out tracking and managing by cableless communication in the hope of the transportation of all counters, business such as be open to the custom.In addition, on technical researches such as electronic tag, read write line, system software, many relevant plans are arranged also, with common raising Taiwan RFID application level.

5, China

Be called as RFID China in 2005 and use year.Easily see international research and find, although RFID just became market focus at nearly 2 years, on Chinese market, RFID is ripe relatively in the application of low frequency and high frequency.From industry, the part link of government department, transportation industry, manufacturing is recent important development field, and it then is the main development field in mid-term that logistic industry, manufacturing supply chain management are improved.

Easily see international prediction, will reach 50.59 hundred million yuan to China RFID market scale in 2009, annual compound growth rate is 33.2%, and wherein RFID label market will reach 38.07 hundred million yuan, and read write line will reach 6.84 hundred million yuan, and software and service will reach 5.67 hundred million yuan.

Figure 1 shows that Chinese radio frequency ID Application Areas distribution schematic diagram, wherein s-generation identity card has used 38%, public transport has used 14%, the campus has used 11%, property/cell management has used 8%, and motorway has used 7%, and e-ticketing has used 7%, the Internet bar has used 3%, and other industry has used 12%.In sum, the subject matter that faces at present is to have signal interferential defective.

RFID mainly is based on radiowave and transmits principle, and when radiowave ran into metal or liquid, the signal conduction can produce to be disturbed and decay, and then influences the reliability and the accuracy of data read.In some particular surroundingss, as the RFID label is affixed on outside the aluminium pot of dixie cup, or on the computer metal shell, all can run into this class problem.Influence the Application Areas of RFID.

Before the invention process, during RFID used both at home and abroad, when radiowave ran into metal or liquid, the signal conduction can produce to be disturbed and decay, and then influences the reliability and the accuracy of data read.In some particular surroundingss, as the RFID label is affixed on outside the aluminium pot of dixie cup, or on the computer metal shell, all can there be this class problem.

Summary of the invention:

The purpose of this invention is to provide a kind of electromagnetic impedance match height, anti-electromagnetic signal interference performance is strong, and absorption band is wide, specific absorption is high, reflection is little, and the radio frequency read false rate is low, does not cause the radio frequency electromagnetic impedance match anti-electromagnetic interference composite coating of secondary electromagnetic pollution.

Another object of the present invention provides the preparation method of composite coating.

A further object of the present invention provides the spraying method of composite coating.

In order to overcome the deficiencies in the prior art, technical scheme of the present invention is to solve like this: radio frequency electromagnetic impedance match anti-electromagnetic interference composite coating, special character of the present invention is that described composite coating is made up of impedance matching coating and bottom charcoal blacking, described impedance matching coating is by 58%～80% resin solution, 8%～40% nanometer beta silicon carbide, 1%～2% nanometer nickel, 1%～12% polystyrene is formed; Described bottom charcoal blacking is by 75%～85% resin solution, and 15%～25% carbon black is formed.

One, the preparation method of composite coating, undertaken by following step:

1) resin solution preparation:

1. preparing solvent:

Solvent is made up of hexone, butyl glycol ether, three kinds of materials of propyl carbinol, by quality than hexone: butyl glycol ether: propyl carbinol=3～5: 1～3: 1, above-mentioned stirring solvent is mixed;

2. dissolving resin

B133 resin or Resins, epoxy or acrylic resin are got wherein one or both to be added in the solvent at the uniform velocity, slowly, portions of resin solvent=7～8: 2～3, use the strong mixer heated and stirred, in temperature is 60 ℃～80 ℃ following condensing reflux 30min～60min, treats that resin dissolves is that the homogeneous transparent body promptly becomes resin solution;

2) wave adsorption compound coating preparation

(1) impedance matching coating compound method:

A. the resin solution after will dissolving takes by weighing required weight by mass percentage and pours in the ball grinder;

B. nanometer beta silicon carbide, nanometer nickel, polystyrene are taken by weighing required weight by mass percentage and pour in the ball grinder, tentatively stir with glass stick;

C. ball milling: speed 400r/h, time 60min;

D. good liquid is impedance matching coating to pour out ball milling, seals up for safekeeping stand-by;

(2) priming paint compound method:

A. the resin solution after will dissolving takes by weighing weight by required mass ratio;

B. carbon black is taken by weighing weight by required mass ratio;

C. the carbon black that weighs up is poured in the resin solution that weighs up, stirring is priming paint, seals up for safekeeping stand-by.

Two, the spraying method of wave adsorption compound coating, undertaken by following step:

Spraying method is to spray the bottom charcoal blacking earlier, sprays impedance matching coating again;

1. spray the bottom charcoal blacking: after will being cleaned up by spray thing RFID label surface, with spray gun the bottom charcoal blacking evenly is sprayed on body surface, coating thickness 30 μ m;

2. impedance matching coating evenly is sprayed onto on the bottom charcoal blacking surface with spray gun, according to the different requirements of signal immunity from interference, 1～5 layer of top layer spray, every layer thickness 30 μ m;

3. will spray good sample and be product in 30 minutes in 60 ℃～75 ℃ oven dry of temperature.

The present invention compared with prior art, has the electromagnetic impedance match height, anti-electromagnetic signal interference performance is strong, and absorption band is wide, specific absorption is high, reflection is little, and the RFID read false rate is low, do not cause advantages such as secondary electromagnetic pollution, effectively solve when electric wave runs into metal or liquid in the RFID application, the signal conduction can produce to be disturbed and decay, and then influences the reliability and the accuracy of data read, expand the Application Areas of RFID greatly, be widely used in the every field of radio frequency.

Technical indicator

(1) anti-electromagnetic interference scope 400MHZ～20GHZ

(2) scattering parameter: S ₁₁0.8～0.95

S ₂₂0.72～0.9

S ₁₂0.03～0.28

(3) power reflectance R _P-15.23dB～-22.5dB

(4) power transmittance T _P-1.23dB～-0.97dB

(5) power absorption rate A _P-16.97dB～-23.51dB

(6) read distance: 2～5 meters

(7) read success ratio: 〉=99.93%

Basic principle

Nano material reduces its reflectivity because quantum size effect and the tunnel effect that its special structure causes causes it to produce good hertzian wave impedance matching and absorbing property in the certain size scope greatly, reaches the purpose of the anti-electromagnetic interference of signal.

The purpose of radio frequency ID electromagnetic impedance match signal anti-electromagnetic interference composite coating research mainly contains two aspects: the one, and the electromagnetic field in control internal radiation zone does not make it run off a certain zone, guarantees that output signal is normal; The 2nd, prevent that external radiation from entering a certain zone, reach the RFID electromagnetic impedance match, signal is not subjected to Electromagnetic Interference.Hertzian wave can be regarded as by electric field component E and the organic plane wave that is formed by stacking of magnetic-field component H.Shielding electromagnetic waves mainly relies on the reflection of shielding, sorption to realize.Under high frequency condition, the shielding surface produces eddy current, eddy current produces counter magnetic field and offsets former magneticinterfering field, produces thermal losses simultaneously.

A branch of sinusoidal plane wave vertical irradiation is to the individual layer baffle that is connected to load, and microwave when inciding lossy dielectric by freeboard reflection and transmission phenomenon can take place at the interface, and the reflection coefficient of microwave depends on wave resistance Z at the interface at the interface _InWith air middle impedance Z ₀Difference

$R=\frac{Z_{\mathrm{in}}-Z_0}{Z_{\mathrm{in}}+Z_0}---(3-1)$

By transmission line theory as can be known, at the interface wave resistance by the natural impedance of transmission line and loaded impedance decision

$Z_{\mathrm{in}}=Z_C\frac{Z_L+Z_C\tanh \left(\mathrm{\Γd}\right)}{Z_C+Z_L\tanh \left(\mathrm{\Γd}\right)}---(3-2)$

In the formula, Z _CAnd Z _LBe respectively absorbing material natural impedance and loaded impedance, and natural impedance Z _CThe equivalent electric magnetic parameter that just depends on material

$Z_C=\sqrt{\frac{{\mathrm{\μ}}_r{\mathrm{\μ}}_0}{{\mathrm{\ϵ}}_r{\mathrm{\ϵ}}_0}}---(3-3)$

In the formula, μ ₀And ε ₀Be respectively permeability of vacuum and permittivity of vacuum, μ _rAnd ε _rBe respectively the equivalent relative dielectric constant and the equivalent relative magnetic permeability of material, the two is all plural number at microwave frequency band, can be expressed as

ε _r＝ε’-jε” (3-4a)

μ _r＝μ’-jμ” (3-4b)

Γ is a propagation constant in the formula (3-2)

$\mathrm{\Γ}=\mathrm{j\ω}\sqrt{{\mathrm{\μ}}_r{\mathrm{\μ}}_0{\mathrm{\ϵ}}_r{\mathrm{\ϵ}}_0}=\mathrm{\α}+\mathrm{j\β}---(3-5)$

In the formula, α characterizes the decay of hertzian wave in medium, is called reduction coefficient, and β is a phase factor, and ω is a radian frequency, can in the hope of

$\mathrm{\α}=\mathrm{\ω}\left({\mathrm{\μ}}^{,}{\mathrm{\μ}}_0{\mathrm{\ϵ}}^{,}{\mathrm{\ϵ}}_0\right)+{\left\{2[\frac{\mathrm{\μ}\′\′\mathrm{\ϵ}\′\′}{\mathrm{\μ}\′\mathrm{\ϵ}\′}-1+{(1+\frac{{\mathrm{\μ}\′\′}^2}{{\mathrm{\μ}\′}^2}+\frac{{\mathrm{\ϵ}\′\′}^2}{{\mathrm{\ϵ}\′}^2}+\frac{{\mathrm{\μ}\′\′}^2{\mathrm{\ϵ}\′\′}^2}{{\mathrm{\μ}\′}^2{\mathrm{\μ}\′}^2})}^{\frac{1}{2}}]\right\}}^{\frac{1}{2}}---(3-6)$

Hertzian wave bursts out, multiple phenomenon such as absorption, reflection, refraction after running into metal, and total electromagnetic shielding effectiveness SE should be hertzian wave conductively-closed thing reflection loss R, absorption loss A, and interior part is penetrated the summation of loss B, that is:

SE＝R+A+B

R＝(Z ₀-Z ₁)/(Z ₀+Z ₁)＝50+10Log(ρ·f) ^-1

In the formula: Z ₀=(μ ₀/ ε ₀) ^1/2Z ₁=(μ ₁/ ε ₁) ^1/2

μ ₀And μ ₁---the magnetic permeability of freeboard and absorbing material;

ε ₀And ε ₁---the specific inductivity of freeboard and absorbing material.

ρ: shield volume specific resistance (Ω cm)

F: frequency (MHz)

D: shielding thickness (cm)

In order not produce reflection, reflection coefficient is necessary for zero.Promptly satisfy Z ₀=Z ₁Or μ ₀/ ε ₀=μ ₁/ ε ₁, Here it is desirable absorbing material impedance matching principle.Because the μ of real material is often less than μ ₀And ε is greater than ε ₀, be difficult to satisfy above-mentioned requirements, thereby adopt the method for impedance transition mechanism transition to reach impedance matching approx in this project.

By as can be seen above, no matter be that microwave is all closely related with the micro-wave dielectric constant and the microwave magnetic permeability of dielectric material at the interface reflection or the decay in medium, so when the research microwave absorbing material is exactly in fact the component and the structure formation of designing material, thereby reach incident wave absorption as much as possible by the electromagnetic parameter of adjustment and optimization material.And the effect of absorption agent is exactly to be used for adjusting the electromagnetic parameter of material to increase the absorption of material to microwave, reduce the interference to signal, so the electromagnetic parameter of absorption agent is most important to the microwave absorbing property of material.

When f and d one timing, the ρ value has determined the screen layer conductivity, and the SE value is high more, and shield effectiveness is good more.The surface atom number of nanoparticle is directly proportional with α/γ substantially with the ratio of particle total atom number, and (γ is particle radii, and α is an atomic radius), the surface atom of nanoparticle exists a large amount of dangling bonds and lattice distortion, has bigger activity.The nanoparticle granularity is more little, and its surface atom is just many more, and its physical and chemical activity is just big more.From the wave-absorbing mechanism angle, absorbing material can be divided into conductivity type and magnetic conduction type two classes.So-called conductivity type absorbing material, promptly when absorbing material is subjected to the external magnetic field induction, produce induced current in conductor, this induced current produces the magnetic field opposite with the external magnetic field direction again, thereby offset with external magnetic field, reach the shielding effect of electromagnetic field to external world.Magnetic conduction type absorbing material then is by magnetic hysteresis loss and ferro resonance loss and absorb electromagnetic energy in a large number, and electromagnetic energy is converted into heat energy.Nano material is made up of crystalline phase and amorphous phase, the spuious magnetization of domain wall motion appears being unfavorable at material internal for the two-phase soft magnetic materials, make magnetic loss increase, increase with magnetic loss can cause the enhancing of material to the absorption of electromagnetic wave loss, the electromagnetic parameter of macroscopic view reflection material increases, and the magnetic loss of the nano material that Here it is particle diameter is little is greater than the physical essence of the magnetic loss of the big nano material of particle diameter.The wave-sucking performance of nano material increases with the increase of frequency, mainly is the loss because magnetic is burst, and eddy-current loss equal loss's mode has due to the characteristic that the increase with frequency increases.

Nano material is meant the material of the characteristic dimension of material component in the 1-100nm scope.When the size of a particulate is little during to nanometer scale, its microtexture and performance both be different from the microsystem of atom, molecule, also were different from the macrobead material meta system that shows eigen character, but between a transition system between the two.The nanoparticle size is little, and specific surface area is big, has very high surface energy, thereby its chemical property is had a significant impact.After experiment showed, that the particle dispersity is brought up to a certain degree, along with reducing of particle dia, be positioned at the atomicity of particle surface and the ratio of total atom number and sharply increase, when particle diameter was reduced to 5nm, the surface atom proportion can reach 50%.Because the surface atom number increases, atomicity reduces in the particulate, enable with in electronic level divide, the energy level spacing after the division is in the energy region interior (1 * 12 of microwave ^-2-1 * 10 ^-5EV), thus cause new suction ripple passage.Nano material has small-size effect, surface interface effect, quantum size effect and macro quanta tunnel effect owing to himself structural feature, thereby compare with conventional material with component, have many unusual performances at aspects such as catalysis, optics, magnetic, mechanics, in absorption of electromagnetic wave, the interference aspect that reduces signal demonstrates good development prospect.

Coating has electromagnetic impedance match, signal anti-electromagnetic interference capability, signal anti-electromagnetic interference capability and ε (specific inductivity); ρ (resistivity); F (frequency Hz); μ (magnetic conduction relatively); α/γ (γ is particle radii, and α is an atomic radius) is closely related; Promptly with coating in suction ripple unit content, nano-particles size size, coating resistivity, specific inductivity, coat-thickness, treatment process, bake out temperature closely related, different content has different immunity from interferencies with thickness.

Description of drawings

Fig. 1 is Chinese radio frequency ID Application Areas distribution schematic diagram;

Fig. 2 is microwave electromagnetic impedance matching principle figure of the present invention;

Fig. 3 is a process flow sheet of the present invention.

Embodiment

Accompanying drawing 2, accompanying drawing 3 are embodiments of the invention.

Below in conjunction with drawings and Examples summary of the invention is described further:

With reference to shown in Figure 2, the surface of metal sheet one side is spraying one deck 30 μ m bottom charcoal blackings evenly, again on the surface of bottom charcoal blacking according to the different requirements of signal immunity from interference, spray 1～5 layer impedance matching coating, every layer thickness 30 μ m; Impedance matching coating surface attaching rfid tag, the hertzian wave that sends when electromagnetic wave emission source is on the point of label by penetrating of pasting and is reflected and absorb by impedance matching coating, its reflectivity is-15.23dB～-22.5dB, specific absorption is-16.97dB～-23.51dB, so just make penetrate be on the point of card or label read success ratio 〉=99.93%, reading distance is 2～5 meters, thereby reaches the purpose of signal anti-electromagnetic interference capability.

Figure 3 shows that process flow sheet, technical process comprises: the solvent preparation, with the dissolution with solvents resin for preparing, prepare impedance matching coating and priming paint respectively with the resin solution that dissolving is good, to the radio-frequency (RF) device surface cleaning, then with spray gun spraying bottom charcoal blacking, again at bottom charcoal blacking surface spraying impedance matching coating, with 60 ℃～75 ℃ oven dry, inspection after construction packing warehouse-in, sale;

Material requirements:

1. nanometer β-SiC, Ni particle diameter are chosen as d＜100nm, purity 99%;

2. coating is with binding the different resin of requirement selection that resin uses according to different occasions, and this project is used the B133 resin;

3. carbon black: select particle diameter 300 orders, model: VULCAN XC72.

Embodiment 1

Wave adsorption compound coating is made up of impedance matching coating and bottom charcoal blacking, and described impedance matching coating is by 58%～80% resin solution, 8%～40% nanometer beta silicon carbide, and 1%～2% nanometer nickel, 1%～12% polystyrene is formed; Described bottom charcoal blacking is by 75%～85% resin solution, and 15%～25% carbon black is formed.

One, the preparation method of wave adsorption compound coating, undertaken by following step:

1) resin solution preparation:

1. preparing solvent:

Solvent is made up of hexone, butyl glycol ether, three kinds of materials of propyl carbinol, by quality than hexone: butyl glycol ether: propyl carbinol=3～5: 1～3: 1, above-mentioned stirring solvent is mixed;

2. dissolving resin

B133 resin or Resins, epoxy or acrylic resin are got wherein one or both to be added in the solvent at the uniform velocity, slowly, portions of resin solvent=7～8: 2～3, use the strong mixer heated and stirred, in temperature is 60 ℃～80 ℃ following condensing reflux 30min～60min, treats that resin dissolves is that the homogeneous transparent body promptly becomes resin solution;

2) wave adsorption compound coating preparation

1., impedance matching coating compound method:

A. the resin solution after will dissolving takes by weighing required weight by mass percentage and pours in the ball grinder;

B. nanometer beta silicon carbide, nanometer nickel, polystyrene are taken by weighing required weight by mass percentage and pour in the ball grinder, tentatively stir with glass stick;

C. ball milling: speed 400r/h, time 60min;

D. good liquid is impedance matching coating to pour out ball milling, seals up for safekeeping stand-by;

2., bottom charcoal blacking compound method:

A. the resin solution after will dissolving takes by weighing weight by required mass ratio;

B. carbon black is taken by weighing weight by required mass ratio;

C. the carbon black that weighs up is poured in the resin solution that weighs up, stirring is priming paint, seals up for safekeeping stand-by.

Two, the spraying method of wave adsorption compound coating, undertaken by following step:

Spraying method is to spray the bottom charcoal blacking earlier, sprays impedance matching coating again;

1. spray the bottom charcoal blacking: after will being cleaned up by spray thing RFID label surface, with spray gun the bottom charcoal blacking evenly is sprayed on body surface, coating thickness 30 μ m;

2. impedance matching coating evenly is sprayed onto on the bottom charcoal blacking surface with spray gun, according to the different requirements of signal immunity from interference, 1～5 layer of top layer spraying, every layer thickness 30 μ m;

3. will spray good test specimen and be product in 30 minutes in 60 ℃～75 ℃ oven dry of temperature.

Embodiment 2

Described wave adsorption compound coating is made up of impedance matching coating and bottom charcoal blacking, described impedance matching coating is by 60%～76% resin solution, 10%～36% nanometer beta silicon carbide, 1%～2% nanometer nickel, 1%～10% polystyrene is formed, described bottom charcoal blacking is by 77%～82% resin solution, and 18%～23% carbon black is formed, and preparation method and spraying method are with embodiment 1.

Embodiment 3

Described wave adsorption compound coating is made up of impedance matching coating and bottom charcoal blacking, described impedance matching coating is by 62%～73% resin solution, 16%～30% nanometer beta silicon carbide, 1%～2% nanometer nickel, 1%～9% polystyrene is formed, described bottom charcoal blacking is by 79%～81% resin solution, and 19%～21% carbon black is formed, and preparation method and spraying method are with embodiment 1.

Embodiment 4

Described wave adsorption compound coating is made up of impedance matching coating and bottom charcoal blacking, described impedance matching coating is by 65%～70% resin solution, 20%～27% nanometer beta silicon carbide, 1%～2% nanometer nickel, 1%～8% polystyrene is formed, described bottom charcoal blacking is by 80% resin solution, and 20% carbon black is formed, and preparation method and spraying method are with embodiment 1.

Embodiment 5

Described wave adsorption compound coating is made up of impedance matching coating and bottom charcoal blacking, described impedance matching coating is by 60% resin solution, 36% nanometer beta silicon carbide, 1% nanometer nickel, 3% polystyrene is formed, described bottom charcoal blacking is by 77% resin solution, and 23% carbon black is formed, and preparation method and spraying method are with embodiment 1.

Embodiment 6

Described wave adsorption compound coating is made up of impedance matching coating and bottom charcoal blacking, described impedance matching coating is by 76% resin solution, 10% nanometer beta silicon carbide, 2% nanometer nickel, 12% polystyrene is formed, described bottom charcoal blacking is by 82% resin solution, and 18% carbon black is formed, and preparation method and spraying method are with embodiment 1.

Embodiment 7

Described wave adsorption compound coating is made up of impedance matching coating and bottom charcoal blacking, described impedance matching coating is by 62% resin solution, 30% nanometer beta silicon carbide, 1%～2% nanometer nickel, 1%～9% polystyrene is formed, described bottom charcoal blacking is by 79% resin solution, and 21% carbon black is formed, and preparation method and spraying method are with embodiment 1.

Embodiment 8

Described wave adsorption compound coating is made up of impedance matching coating and bottom charcoal blacking, described impedance matching coating is by 73% resin solution, 16% nanometer beta silicon carbide, 2% nanometer nickel, 9% polystyrene is formed, and described bottom charcoal blacking is by 81% resin solution, and 19% carbon black is formed,, preparation method and spraying method are with embodiment 1.

Embodiment 9

Described wave adsorption compound coating is made up of impedance matching coating and bottom charcoal blacking, described impedance matching coating is by 65% resin solution, 27% nanometer beta silicon carbide, 1% nanometer nickel, 7% polystyrene is formed, described bottom charcoal blacking is by 80% resin solution, and 20% carbon black is formed, and preparation method and spraying method are with embodiment 1.

Embodiment 10

Described wave adsorption compound coating is made up of impedance matching coating and bottom charcoal blacking, described impedance matching coating is by 70% resin solution, 20% nanometer beta silicon carbide, 1% nanometer nickel, 9% polystyrene is formed, described bottom charcoal blacking is by 80% resin solution, and 20% carbon black is formed, and preparation method and spraying method are with embodiment 1.

Embodiment 11

Wave adsorption compound coating is made up of impedance matching coating and bottom charcoal blacking, and described impedance matching coating is by 58% resin solution, 35% nanometer beta silicon carbide, and 1% nanometer nickel, 6% polystyrene is formed; Described bottom charcoal blacking is by 75% resin solution, and 25% carbon black is formed, and preparation method and spraying method are with embodiment 1.

Embodiment 12

Wave adsorption compound coating is made up of impedance matching coating and bottom charcoal blacking, and described impedance matching coating is by 80% resin solution, 8% nanometer beta silicon carbide, and 1% nanometer nickel, 11% polystyrene is formed; Described bottom charcoal blacking is by 85% resin solution, and 15% carbon black is formed, and preparation method and spraying method are with embodiment 1.

In sum, gordian technique of the present invention:

1. the selection of nanometer impedance matching material.Different material electromagnetic parameter differences has different impedance matchings and anti-electromagnetic interference performance.It is one of key problem in technology that impedance matching, anti-electromagnetic interference material are selected.The present invention selects nanometer β-SiC, Ni for use, purity 99% through a large amount of scientific experiments.

2. the anti-electromagnetic interference performance research of SiC, Ni nanometer particle size and coating, SiC, Ni nanometer seed footpath are studied extremely important with the impedance matching of coating, anti-electromagnetic interference performance, have only and select optimum size of particles, just can make coating demonstrate good performance aspect impedance matching, the low reflection electromagnetic wave.The present invention selects particle diameter d＜100nm of nano SiC, Ni for use.

3. have the broadband impedance matching of conductive nano and magnetic property, anti-electromagnetic interference coating process prescription concurrently,, formulate and produce nano SiC/Ni antiradar coatings technical recipe, the technological process of production through experimental study.The content difference of β-SiC, Ni, polystyrene, anti-electromagnetic interference performance influence is very big, thereby the present invention is the rational prescription of having determined on a large amount of experiment basis, major part is absorbed obstruct when utilizing nanoparticle to have big specific surface effect and electron tunneling effect to make hertzian wave by coating, thereby reach the effect that makes the electromagnetism wave height absorb low reflection, can make the anti-electromagnetic interference product of various broadbands high-performance.

4. dispersion and the dissolving technology of nanometer β-SiC, Ni have been solved.

5. spraying coating process, spraying method directly influence anti-electromagnetic interference performance, through a large amount of experiments, the method that the present invention adopts bottom and top layer to spray respectively, bottom adopts different coating with the surface, according to the requirement of the anti-electromagnetic interference of difference, the different spraying number of plies of top layer spraying.

6. solved nanometer β-SiC, Ni with by the fastness technology that combines on spray surface.

Claims (6)

1. radio frequency electromagnetic impedance match anti-electromagnetic interference composite coating, it is characterized in that described wave adsorption compound coating is made up of impedance matching coating and bottom charcoal blacking, described impedance matching coating is by 58%～80% resin solution, 8%～40% nanometer beta silicon carbide, 1%～2% nanometer nickel, 1%～12% polystyrene is formed; Described bottom charcoal blacking is by 75%～85% resin solution, and 15%～25% carbon black is formed.

2. radio frequency electromagnetic impedance match anti-electromagnetic interference composite coating according to claim 1, it is characterized in that described wave adsorption compound coating is made up of impedance matching coating and bottom charcoal blacking, described impedance matching coating is by 60%～76% resin solution, 10%～36% nanometer beta silicon carbide, 1%～2% nanometer nickel, 1%～10% polystyrene is formed, and described bottom charcoal blacking is by 77%～82% resin solution, and 18%～23% carbon black is formed.

3. radio frequency electromagnetic impedance match anti-electromagnetic interference composite coating according to claim 1 and 2, it is characterized in that described composite coating is made up of impedance matching coating and bottom charcoal blacking, described impedance matching coating is by 62%～73% resin solution, 16%～30% nanometer beta silicon carbide, 1%～2% nanometer nickel, 1%～9% polystyrene is formed, and described bottom charcoal blacking is by 79%～81% resin solution, and 19%～21% carbon black is formed.

4. radio frequency electromagnetic impedance match anti-electromagnetic interference composite coating according to claim 1 and 2, it is characterized in that described composite coating is made up of impedance matching coating and bottom charcoal blacking, described impedance matching coating is by 65%～70% resin solution, 20%～27% nanometer beta silicon carbide, 1%～2% nanometer nickel, 1%～8% polystyrene is formed, and described bottom charcoal blacking is by 80% resin solution, and 20% carbon black is formed.

5. the preparation method of the described composite coating of claim 1, undertaken by following step:

1) resin solution preparation:

1. preparing solvent:

Solvent is made up of hexone, butyl glycol ether, three kinds of materials of propyl carbinol, by quality than hexone: butyl glycol ether: propyl carbinol=3～5: 1～3: 1, above-mentioned stirring solvent is mixed;

2. dissolving resin

B133 resin or Resins, epoxy or acrylic resin are got wherein one or both to be added in the solvent at the uniform velocity, slowly, portions of resin solvent=7～8: 2～3, use the strong mixer heated and stirred, in temperature is 60 ℃～80 ℃ following condensing reflux 30min～60min, treats that resin dissolves is that the homogeneous transparent body promptly becomes resin solution;

2) composite coating preparation

1., impedance matching coating compound method:

A. the resin solution after will dissolving takes by weighing required weight by mass percentage and pours in the ball grinder;

B. nanometer beta silicon carbide, nanometer nickel, polystyrene are taken by weighing required weight by mass percentage and pour in the ball grinder, tentatively stir with glass stick;

C. ball milling: speed 400r/h, time 60min;

D. good liquid is impedance matching coating to pour out ball milling, seals up for safekeeping stand-by;

2., bottom charcoal blacking compound method:

A. the resin solution after will dissolving takes by weighing weight by required mass ratio;

B. carbon black is taken by weighing weight by required mass ratio;

C. the carbon black that weighs up is poured in the resin solution that weighs up, stirring is priming paint, seals up for safekeeping stand-by.

6. the spraying method of the described wave adsorption compound coating of claim 1, undertaken by following step:

Spraying method is to spray the bottom charcoal blacking earlier, sprays impedance matching coating again;

1. spray the bottom charcoal blacking: after will being cleaned up by spray thing RFID label surface, with spray gun the bottom charcoal blacking evenly is sprayed on body surface, coating thickness 30 μ m;

2. impedance matching coating evenly is sprayed onto on the bottom charcoal blacking surface with spray gun, according to the different requirements of signal immunity from interference, 1～5 layer of top layer spraying, every layer thickness 30 μ m;

3. will spray good test specimen and be product in 30 minutes in 60 ℃～75 ℃ oven dry of temperature.

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