CN103275591A - 0.6-18GHz-frequency-band microwave-absorbing/epoxy anti-electromagnetic interference coating material and preparation method thereof - Google Patents
0.6-18GHz-frequency-band microwave-absorbing/epoxy anti-electromagnetic interference coating material and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of chemical industry and materials, and relates to a 0.6-18GHz-frequency-band wave-absorbing powder/epoxy anti-electromagnetic interference coating material and a preparation method thereof. The preparation method comprises the steps of: dispersing and grinding specific frequency band of wave-absorbing powder and epoxy resin to obtain wave-absorbing powder/epoxy resin slurry, stirring and blending non-essential modified resin, non-essential amino resin, a non-essential epoxy curing agent, a non-essential solvent, non-essential filler, and non-essential coating auxiliaries, curing into membranes at room temperature, to obtain the 0.6-18GHz-frequency-band wave-absorbing/epoxy anti-electromagnetic interference coating material. The 0.6-18GHz-frequency-band wave-absorbing/epoxy anti-electromagnetic interference coating material can absorb more than 85% of 0.6-18GHz frequency band of electromagnetic wave, is good in corrosion resistance property and mechanical property, has good workability and long-acting anti-electromagnetic interference effect, and can be used in the fields of a mobile communication substation, a power locomotive, a high-voltage substation and other places easily generating high-frequency electromagnetic wave interference.
Description
Technical field
The invention belongs to chemical industry, material technology field, specifically is anti-electromagnetic interference coating material of suction ripple powder/epoxy of a kind of 0.6-18GHz frequency range and preparation method thereof.
Background technology
Aspect hertzian wave pollution protection, what adopt mostly is the reflection of electromagnetic wave material, though this method has solved the protective effect to certain object, certainly will cause electromagnetic secondary pollution again at present.
Continuous progress along with development of modern science and technology and industrial civilization, electronic apparatus and communication system are penetrated into to be produced and various fields in life, electromagnetic radiation becomes continuous enhanced physical factor, change the physical properties of environment for human survival, intensity, time and complicacy that the mankind are exposed to electromagnetic radiation grow with each passing day, along with electromagnetic pollution is more and more many, more and more strong, become the fourth-largest public hazards in the global range gradually.The environmental pollution meeting that electromagnetic radiation produces brings many harm for the people's life, and it may have influence on the normal operation of precision instrument and electronics on the one hand; Long-term on the other hand electromagnetic radiation meeting causes that pathology appears in human body, is unfavorable for health, studies have shown that the microblogging electromagnetic radiation can cause the illness of biological substrate, nervus centralis, cardiovascular systems, crystalline lens, blood system.
Therefore, how to protect the problem of electromagnetic radiation and interference (EMI) effectively, the harm that reduces electromagnetic radiation has become and has become more and more important, and has become the important topic of global scientific and technological circle.
Studies show that previously utilizes some material or structure can effectively protect electromagnetic radiation electromagnetic reflection and sorption.Relatively Chang Yong screening material against electromagnetic radiation normally has the material such as metal, alloy and carbon, graphite of high conductivity, realizes shielding protection to buildings, various plant and instrument by these materials being made forms such as plate, net, fabric and coating.The problem that can not be ignored is, the simple high-conductivity metal that adopts is as shielding material, its shielding effect does not mainly match according to incident electromagnetic wave and dielectric material impedance and produces reflection and realize, but the hertzian wave of its reflection does not disappear or produces strong decay, therefore tend to other outer zones of shielding area are produced new radiation hazradial bundle, thereby form the secondary electromagnetic pollution.
Absorbing material mainly is because some material has higher magnetic loss tangent value, relies on magnetic polarization mechanism decay such as magnetic hysteresis loss, domain wall resonance, aftereffect loss, absorbs hertzian wave, as ferrite, carbonyl iron dust etc.; Perhaps utilize some materials to have higher electrical loss tangent value, rely on the electronic polarization of medium or interfacial polarization to decay, absorb hertzian wave, as graphitized carbon black, graphite etc.But because the characteristic of absorbing material itself makes its influence that is subject to frequency, can only have shielding effect preferably to a certain narrower frequency range.
Usually absorbing material can be divided into structure-type and coating type by moulding technology and supporting capacity.The structure-type wave-absorption material has carrying and reduces the reflection of electromagnetic wave dual-use function, normally absorption agent is dispersed in the structured material; The coating type absorbing material normally is dispersed in absorption agent in the matrix of superpolymer and makes microwave absorbing coating, and its technology is simple, and is easy to use, regulates easily and comes into one's own.Absorbing material mainly contains dielectric loss type and magnetic loss type.Dielectric loss type absorption agent such as expanded graphite, silicon carbide, barium titanate, conductive polymers etc. have higher dielectric loss tangent value, and its loss mechanism is to rely on electronic polarization or the interfacial polarization decay of medium and absorb hertzian wave; Magnetic loss type absorption agent such as ferrite, carbonyl iron dust etc. have higher magnetic loss tangent value, and loss mechanism is to rely on magnetic polarization mechanism decay and absorption hertzian wave such as magnetic hysteresis loss, domain wall resonance and aftereffect loss altogether.
China Patent No.: ZL200810011234, patent name: the preparation method who discloses foam aluminum alloy base wave-absorbing material in a kind of preparation method's of foam aluminum alloy base wave-absorbing material the patent of invention, it comprises the surface preparation of foam aluminium alloy material, the spraying step of the preparation of wave absorbing agent coating and foam aluminium alloy material, foam aluminium alloy material with process skimming treatment and sandblasting is matrix, at the single antiradar coatings of its surperficial butcher or meet antiradar coatings, be prepared into single wave absorbing agent foam aluminum alloy base wave-absorbing material or meet the wave absorbing agent foam aluminum alloy base wave-absorbing material.The absorbing material that this method obtains is in 26.5 ~ 40.0GHz frequency range build-in test reflection of electromagnetic wave rate, is lower than-the broadband most significant digit 3.18GHz of 10dB, and absorbing property still is on the low side.
China application number: CN201010561198.2, patent name: meet to disclose in the patent application that meets the coating electromagnetic shielding material of coating electromagnetic screen coating and preparation thereof and meet the antiradar coatings that the coating electromagnetic screen coating comprises the conductive layer coating with reflection function and has absorptive function; The reflecting layer coating composition comprises: polymer emulsion, conductive filler material, coupling agent, defoamer, wetting agent, film coalescence aid, thickening material and water; Inhaling ripple coating component comprises: polymer emulsion, suction ripple filler, coupling agent, defoamer, wetting agent, film coalescence aid, thickening material and water; The compound mode in this invention employing suction ripple layer and reflecting layer is prepared screening material against electromagnetic radiation, effectively reduces the secondary pollution that electromagnetic radiation causes because of reflection, but this scheme discloses it whether frequency electromagnetic waves is not had good wave-absorbing effect.
Chinese patent application number: CN200910154722.1, patent name: disclose wave-absorbing coating material in the application for a patent for invention of high-efficiency broadband wave-absorbing coating material and using method by inhaling the wave base coating and inhaling the corrugated coating and form, the component of inhaling the wave base coating comprises BaFe12019, BaTi03, expanded graphite, polyacrylate dispersion, TEXANOL membrane-forming agent, 5027 powders, GPE defoamer and PU-220 flow agent.The using method of high-efficiency broadband wave-absorbing coating material of the present invention is: take by weighing each raw material by the mass ratio of inhaling wave base coating component, obtain inhaling the wave base coating after mixing; Take by weighing each raw material by the mass ratio of inhaling corrugated coating component, after mixing, obtain inhaling the corrugated coating; The body surface of high-efficiency broadband wave-absorbing coating material to be coated is carried out grinding process, apply at the body surface through grinding process and inhale the wave base coating, apply at the body surface with suction wave base coating and inhale the corrugated coating.This invention is when reaching certain reflection coefficient, and the coating that needs is thicker, as 2.4 ~ 5.5mm.
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Summary of the invention
In order to solve the problems of the technologies described above, the invention provides anti-electromagnetic interference coating material of suction ripple powder/epoxy of a kind of 0.6-18GHz frequency range and preparation method thereof.
The anti-electromagnetic interference coating material of suction ripple powder/epoxy of a kind of 0.6-18GHz is characterized in that it is made by following raw material: inhale ripple powder, Resins, epoxy, nonessential aminoresin, nonessential cenosphere, nonessential solvent, nonessential color stuffing, nonessential coatings additive(s).
The anti-electromagnetic interference coating material of suction ripple powder/epoxy of described 0.6-18GHz is characterized in that the weight percentage that described each raw material accounts for total raw material is respectively: inhale ripple powder 46%-50%; Resins, epoxy 18%-20%; Aminoresin 2%-3%; Cenosphere 9%-11%; Solvent 8%-10%; Color stuffing 10%-12%, coatings additive(s) 0.5%-1.5% is preferably: inhale ripple powder 50%; Resins, epoxy 18%; Aminoresin 2%; Cenosphere 10%; Solvent 9%; Color stuffing 10%; Coatings additive(s) 1%.
The anti-electromagnetic interference coating material of suction ripple powder/epoxy of described 0.6-18GHz is characterized in that described suction ripple powder is is Fe by component
85Si
2Al
6Cr
7Magneticalloy powder and component be (Ba
0.7Sr
0.3)
3Ni
2Fe
24O
41Z type hexgonal screw material be composited by the mass ratio of 2:3.
The anti-electromagnetic interference coating material of suction ripple powder/epoxy of described 0.6-18GHz is characterized in that described Resins, epoxy is selected from one or more the composition in bisphenol A epoxide resin, cycloaliphatic epoxy resin, the bisphenol F epoxy resin.
The anti-electromagnetic interference coating material of suction ripple powder/epoxy of described 0.6-18GHz is characterized in that described nonessential aminoresin, is selected from one or more the composition in methyl-etherified aminoresin, butyl ether aminoresin, the urea-formaldehyde resin.
The anti-electromagnetic interference coating material of suction ripple powder/epoxy of described 0.6-18GHz is characterized in that described nonessential cenosphere is selected from one or more the composition in hollow glass bead, ceramic hollow microballon, the hollow grey microballon of fine coal.
The anti-electromagnetic interference coating material of suction ripple powder/epoxy of described 0.6-18GHz, it is characterized in that described nonessential coatings additive(s) is selected from one or more the composition in flow agent, thickening material, film coalescence aid, defoamer, anti-settling agent, dispersion agent, the promotor etc., described nonessential solvent is selected from one or more the composition in benzene class, alcohols, the ketone equal solvent.
The anti-electromagnetic interference coating preparation methods of suction ripple powder/epoxy of described 0.6-18GHz is characterized in that comprising following steps:
1) under agitation condition, will inhale the ripple powder and mix with Resins, epoxy, evenly disperse the back to prepare stealthy powder epoxy resin grout with sand milling or ball milling method;
2) under agitation condition, 1) in stealthy powder epoxy resin grout in add nonessential aminoresin, nonessential cenosphere, nonessential solvent, nonessential color stuffing, nonessential coatings additive(s) and make the anti-electromagnetic interference coating of epoxy;
3) nonessential epoxy hardener is added in the anti-electromagnetic interference coating of epoxy, stir slaking 20 minutes;
4) film-forming under normal temperature or the 80 ℃/2h condition.
In film process, anti-electromagnetic interference epoxy resin grout and epoxy hardener carry out chemical crosslink reaction, can obtain the anti-electromagnetic interference coating material of suction ripple powder/epoxy of 0.6-18GHz, wherein inhale the ripple powder and have certain oil absorbency, under the effect of dispersion grinding shearing force, coated by Resins, epoxy, obtaining particle diameter is 40 μ m and following grinding dispersion.
The anti-electromagnetic interference coating preparation methods of suction ripple powder/epoxy of described 0.6-18GHz, it is characterized in that the nonessential epoxy hardener that adds in the step 3) is selected from polyamide-based solidifying agent, low molecule amine curing agent, the composition of one or more in the cashew nut oil modified solidifying agent etc.
The anti-electromagnetic interference coating material of suction ripple powder/epoxy of described 0.6-18GHz is at the metal object surface of required shielding, as the application in fields such as electric locomotive chassis, electrical equipment, power transmission and transformation.
Suction ripple powder of the present invention is by the Fe with the atomization process preparation
85Si
2Al
6Cr
7Z type (the Ba of alloy powder and sol-gel technology preparation
0.7Sr
0.3)
3Ni
2Fe
24O
41Ferrite is raw material, adopts the matrix material that is made of this 2 class material of high-energy ball milling compounding technology preparation.
The composite powder of process high-energy ball milling gained as shown in Figure 1, the iron alloy particle adhesion is on ferrite crystal grains, composite material granular still keeps the grain morphology of Z-iron oxysome hexagonal plate, and alloy particle becomes irregular flakey because of ball-milling processing by original sphere.
This suction ripple powder has the electromagnetic performance of setting, hertzian wave to the 0.6-18GHz range of wavelength has good attenuation by absorption effect, in the forming process of filming, form the suction ripple powder coating of evenly gathering through the suction ripple powder particulate by resin-coated that obtains after the dispersion grinding, can effectively absorb the hertzian wave of this wave band.
The anti-electromagnetic interference coating material of suction ripple powder/epoxy of 0.6-18GHz frequency range of the present invention, in film process, anti-electromagnetic interference epoxy resin grout and epoxy hardener carry out chemical crosslink reaction, can obtain the anti-electromagnetic interference coating material of suction ripple powder/epoxy of 0.6-18GHz, wherein inhale the ripple powder and have certain oil absorbency, under the effect of dispersion grinding shearing force, coated by Resins, epoxy, obtaining particle diameter is 40 μ m and following grinding dispersion.The anti-electromagnetic interference coating material of epoxy of the present invention is to the absorption of electromagnetic wave of 0.6-18GHz frequency range more than 85%, corrosion resistance and good, the mechanical property height, has good construction performance, have long-acting anti-electromagnetic interference effect, can be used for the field, place that mobile communication base station, electric locomotive, high voltage substation etc. easily produce the high-frequency electromagnetic wave excitation.
Description of drawings
Fig. 1 is the grain morphology synoptic diagram of composite wave-absorbing powder of the present invention;
Fig. 2 is the reflectance curve synoptic diagram of coated material of the present invention.
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Embodiment
Embodiment 1
1) under agitation condition, the suction ripple powder of the 0.6-18GHz with 50% mixes with 18% Resins, epoxy, evenly disperses the back to prepare stealthy powder epoxy resin grout with sand milling or ball milling method.
2) under agitation condition, add 10% cenosphere, 2% aminoresin, 1% coatings additive(s), 9% solvent in the stealthy powder epoxy resin grout in (1), 10% color stuffing makes the anti-electromagnetic interference coating of epoxy.
3) to scale, epoxy hardener is added in the anti-electromagnetic interference coating of epoxy, stir slaking 20 minutes.
4) film-forming under normal temperature (25 ℃) condition.
Embodiment 2
1) under agitation condition, the suction ripple powder of the 0.6-18GHz with 48% mixes with 20% Resins, epoxy, evenly disperses the back to prepare stealthy powder epoxy resin grout with sand milling or ball milling method.
2) under agitation condition, add 9% cenosphere, 2% aminoresin, 1% coatings additive(s), 9% solvent in the stealthy powder epoxy resin grout in (1), 11% color stuffing makes the anti-electromagnetic interference coating of epoxy.
3) to scale, epoxy hardener is added in the anti-electromagnetic interference coating of epoxy, stir slaking 20 minutes.
4) film-forming under normal temperature (25 ℃) condition.
Embodiment 3
1) under agitation condition, the suction ripple powder of the 0.6-18GHz with 46% mixes with 18% Resins, epoxy, evenly disperses the back to prepare stealthy powder epoxy resin grout with sand milling or ball milling method.
2) under agitation condition, add 11% cenosphere, 3% aminoresin, 1% coatings additive(s), 9% solvent in the stealthy powder epoxy resin grout in (1), 12% color stuffing makes the anti-electromagnetic interference coating of epoxy.
3) to scale, epoxy hardener is added in the anti-electromagnetic interference coating of epoxy, stir slaking 20 minutes.
4) film-forming under normal temperature (25 ℃) condition.
The anti-electromagnetic interference coating material of suction ripple powder/epoxy that adopts above-described embodiment 1 to prepare is sprayed on the flat aluminium alloy plate matrix, makes square standard coated and inhales the ripple plate, and inhaling the ripple layer thickness is 1 mm, and the reflectance curve of microwave absorbing coating as shown in Figure 2.As seen, have in all wave band of 0.6-18GHz and be better than-absorbing property of 15dB.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all is included within protection scope of the present invention.
Claims (10)
1. the anti-electromagnetic interference coating material of suction ripple powder/epoxy of a 0.6-18GHz is characterized in that it is made by following raw material: inhale ripple powder, Resins, epoxy, nonessential aminoresin, nonessential cenosphere, nonessential solvent, nonessential color stuffing, nonessential coatings additive(s).
2. the anti-electromagnetic interference coating material of suction ripple powder/epoxy of 0.6-18GHz as claimed in claim 1 is characterized in that the weight percentage that described each raw material accounts for total raw material is respectively: inhale ripple powder 46%-50%; Resins, epoxy 18%-20%; Aminoresin 2%-3%; Cenosphere 9%-11%; Solvent 8%-10%; Color stuffing 10%-12%, coatings additive(s) 0.5%-1.5% is preferably: inhale ripple powder 50%; Resins, epoxy 18%; Aminoresin 2%; Cenosphere 10%; Solvent 9%; Color stuffing 10%; Coatings additive(s) 1%.
3. the anti-electromagnetic interference coating material of suction ripple powder/epoxy of 0.6-18GHz as claimed in claim 1 is characterized in that described suction ripple powder is is Fe by component
85Si
2Al
6Cr
7Magneticalloy powder and component be (Ba
0.7Sr
0.3)
3Ni
2Fe
24O
41Z type hexgonal screw material be composited by the mass ratio of 2:3.
4. the anti-electromagnetic interference coating material of suction ripple powder/epoxy of 0.6-18GHz as claimed in claim 1 is characterized in that described Resins, epoxy is selected from one or more the composition in bisphenol A epoxide resin, cycloaliphatic epoxy resin, the bisphenol F epoxy resin.
5. the anti-electromagnetic interference coating material of suction ripple powder/epoxy of 0.6-18GHz as claimed in claim 1 is characterized in that described nonessential aminoresin, is selected from one or more the composition in methyl-etherified aminoresin, butyl ether aminoresin, the urea-formaldehyde resin.
6. the anti-electromagnetic interference coating material of suction ripple powder/epoxy of 0.6-18GHz as claimed in claim 1 is characterized in that described nonessential cenosphere is selected from one or more the composition in hollow glass bead, ceramic hollow microballon, the hollow grey microballon of fine coal.
7. the anti-electromagnetic interference coating material of suction ripple powder/epoxy of 0.6-18GHz as claimed in claim 1, it is characterized in that described nonessential coatings additive(s) is selected from one or more the composition in flow agent, thickening material, film coalescence aid, defoamer, anti-settling agent, dispersion agent, the promotor etc., described nonessential solvent is selected from one or more the composition in benzene class, alcohols, the ketone equal solvent.
8. the anti-electromagnetic interference coating preparation methods of suction ripple powder/epoxy of 0.6-18GHz as claimed in claim 1 is characterized in that comprising following steps:
1) under agitation condition, will inhale the ripple powder and mix with Resins, epoxy, evenly disperse the back to prepare stealthy powder epoxy resin grout with sand milling or ball milling method;
2) under agitation condition, 1) in stealthy powder epoxy resin grout in add nonessential aminoresin, nonessential cenosphere, nonessential solvent, nonessential color stuffing, nonessential coatings additive(s) and make the anti-electromagnetic interference coating of epoxy;
3) nonessential epoxy hardener is added in the anti-electromagnetic interference coating of epoxy, stir slaking 20 minutes;
4) film-forming under normal temperature or the 80 ℃/2h condition.
9. the anti-electromagnetic interference coating preparation methods of suction ripple powder/epoxy of 0.6-18GHz as claimed in claim 8, it is characterized in that the nonessential epoxy hardener that adds in the step 3) is selected from polyamide-based solidifying agent, low molecule amine curing agent, the composition of one or more in the cashew nut oil modified solidifying agent etc.
10. one kind as the anti-electromagnetic interference coating material of suction ripple powder/epoxy of any described 0.6-18GHz among the claim 1-7 metal object surface in required shielding, as the application in fields such as electric locomotive chassis, electrical equipment, power transmission and transformation.
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| CN105273580A (en) * | 2015-11-25 | 2016-01-27 | 德阳森华涂料化工有限公司 | Electromagnetic radiation-resisting coating and preparation method thereof |
| CN105647333A (en) * | 2014-10-11 | 2016-06-08 | 邓智平 | Preparation method of rare earth transition intermetallic compound/ferrite composite radar absorbing coating |
| CN106279512A (en) * | 2015-05-26 | 2017-01-04 | 斯迪克新型材料（江苏）有限公司 | The absorbing material of shielding electromagnetic wave |
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