CN100567422C - A kind of preparation method of four-needle-shape nano zinc oxide wave absorbing coating - Google Patents
A kind of preparation method of four-needle-shape nano zinc oxide wave absorbing coating Download PDFInfo
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- CN100567422C CN100567422C CNB2007101756355A CN200710175635A CN100567422C CN 100567422 C CN100567422 C CN 100567422C CN B2007101756355 A CNB2007101756355 A CN B2007101756355A CN 200710175635 A CN200710175635 A CN 200710175635A CN 100567422 C CN100567422 C CN 100567422C
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Abstract
A kind of preparation method of four-needle-shape nano zinc oxide wave absorbing coating belongs to nano wave-absorption coat preparing technology field.Technology is: aluminium sheet is clean with clean-out system and alcohol wash, as coated substrate; Take by weighing certain mass four-acicular nanometer ZnO, add thinner, dispersion agent ultra-sonic dispersion 10min; Add the good Resins, epoxy of dilution then, 30min is stirred on ultrasonic limit, limit; Add an amount of curing agent ethylene diamine at last, stir and ultrasonic elimination bubble; On aluminium sheet, self-vulcanizing 2h makes microwave absorbing coating with the paint spay-coating made.The massfraction of four-acicular nanometer ZnO is 30% in the coating, and coat-thickness is 3.5mm, and the thickness of coating can be controlled by the spraying number of times.This coating has realized that in the 6GHz-18GHz frequency reflectivity minimum value reaches-15.01dB to electromagnetic strong absorption.
Description
Technical field
The invention belongs to nano wave-absorption coat preparing technology field, a kind of preparation method of four-needle-shape nano zinc oxide wave absorbing coating particularly is provided, this method is simple, and coating is higher to absorption of electromagnetic wave, has realized that coating is to the absorption of hertzian wave on the broadband wave band.
Background technology
Stealthy and anti-stealthy struggle is hidden and anti-hidden trial of strength under the new technology condition, adopts stealth material can reduce the radar of weapon, infrared and other signal characteristic, is the important channel that obtains stealthy performance.Traditional stealth material is main to be the reflected signal design of microwave at radar detector separately, mainly comprises absorbing materials such as electrical loss type, magnetic loss type (ferrite), basic metal particle, in the middle of wherein many materials are applied under battle conditions already.
Nowadays, along with the continuous development of detection techniques, traditional absorbing material can not be satisfied the demand, and an urgent demand is the appearance of the novel stealth material surveyed of high-efficiency broadband, the multiple anti-stealth means such as radar, infrared, video, sonar of can escaping simultaneously more.Various countries develop or are are researching and developing multiple different novel stealth material in succession for this reason, nano material has fabulous microwave absorbing property because of it, have broadband simultaneously, compatibility is good, quality is little and characteristics such as thin thickness, therefore the coating of being made by it is hidden radar in very wide frequency band range scouting is all studied nano material and explored as a new generation is stealthy both at home and abroad at present.Its inhale ripple principle on the one hand since the nanoparticle size much smaller than the radar wave wavelength, nanoparticle material is more much better than than conventional material to the transmitance of ripple, has reduced the wave reflection rate greatly; The specific surface area of nanoparticle material is than big 3～4 orders of magnitude of conventional meal on the other hand, also much bigger to the absorption of electromagnetic wave rate than conventional material, this reflected signal strength that just makes radar obtain greatly reduces, and therefore is difficult to find the detection of a target, plays stealthy effect.
Nano ZnO material itself has the ripple of suction usefulness, and it has very high chemistry, high-temperature stability, makes it can satisfy weapons system to the requirement of stealth material rigorous environment, and excellent mechanical property can make it be applied to structured material as strengthening body.Four-acicular nanometer ZnO (T-ZnO) belongs to a kind of of nano-ZnO, and its unique space four acicular structures and matrix compound tense will form the three dimensional network pore structure within the specific limits.When radar wave arrived matrix material: T-ZnO had played the effect of annular conductive mesh on the one hand, and these countless annular conductive mesh make electromagnetic wave energy respond to into the dispersion current energy, thereby realized the absorption to microwave energy; T-ZnO has very big length-to-diameter ratio on the other hand, and under the extra electric field effect, sharp-pointed needle point forms partial highfield easily, and limited electric conductivity causes T-ZnO needles section time electropolarization.In this case, each needles produces resonance and consumes its energy as electric dipole and incident electromagnetic wave; T-ZnO has piezoelectric activity in addition, can be converted into the energy of electric energy or other form with inciding its surperficial hertzian wave vibrational energy, thereby reduce its reflection.
Summary of the invention
The object of the invention is to provide a kind of preparation method of four-needle-shape nano zinc oxide wave absorbing coating, simple microwave absorbing coating technology, realized that coating absorbs more by force electromagnetic on the wideband section, this coating has bigger using value aspect electromagnetic wave shielding.
Concrete technology of the present invention is as follows:
1, aluminium sheet is rinsed well with clean-out system and alcohol, as coated substrate.
2, take by weighing certain mass four-acicular nanometer ZnO, add thinner, dispersion agent ultra-sonic dispersion 10min.Alcohol is as thinner, and dispersion agent is an oleic acid, the alcohol of every 1g four-acicular nanometer ZnO correspondence 0.05～0.1ml oleic acid and 1～1.5ml.
3, adding is diluted good Resins, epoxy with alcohol, and 30～40min is stirred on ultrasonic limit, limit.Every 1g Resins, epoxy correspondence 0.02～0.05ml alcohol.
4, add an amount of curing agent ethylene diamine at last, stir and ultrasonic elimination bubble.Every 1g nano-ZnO correspondence 0.1～0.15ml quadrol.
5, with the paint spay-coating made on aluminium sheet, self-vulcanizing 2～3h makes microwave absorbing coating.The massfraction of ZnO is 30%～35% in the coating, and coat-thickness is 3～3.5mm, and coat-thickness can be controlled by the spraying number of times.
The used four-acicular nanometer ZnO size of the present invention evenly, needle body is about 2～5 μ m, and four pin needle body base diameters are greatly between 200～500nm.
The massfraction of four-acicular nanometer ZnO is 30% in the coating, and coat-thickness is 3.5mm, and the thickness of coating can be controlled by the spraying number of times.
After the invention has the advantages that four-acicular nanometer ZnO and substrate ring epoxy resins are compound, its unique space structure will form the three dimensional network pore structure within the specific limits, when radar wave arrived matrix material: four-acicular nanometer ZnO had played the effect of annular conductive mesh, these countless annular conductive mesh make electromagnetic wave energy respond to into the dispersion current energy, thereby realize the absorption to microwave energy.Microwave absorbing coating to preparation carries out reflectance test (2GHz-18GHz), and the result shows: this coating mainly concentrates on 6GHz between the 18GHz to absorption of electromagnetic wave, and the reflectivity minimum value reaches-15.01dB.
Preparation technology of the present invention is simple, has realized that coating absorbs more by force electromagnetic on the wideband section, and this coating has bigger using value aspect electromagnetic wave shielding.
Description of drawings
Fig. 1 is the microcosmic sem photograph of one four-acicular nanometer ZnO.The quality of four-acicular nanometer ZnO is better as can be observed from Figure, and size is even, and needle body is about 2～5 μ m, and four pin needle body base diameters are greatly between 200～500nm.
Fig. 2 is the reflectivity of four-acicular nanometer ZnO/ epoxide resin wave-absorbing coating and the graph of a relation of frequency.Absorption mainly focuses between the 6GHz-18GHz as we can see from the figure, and the reflectivity minimum value is-15.01dB.
Fig. 3 is the microcosmic sem photograph of four-acicular nanometer ZnO/ epoxide resin wave-absorbing coating, and four-acicular nanometer ZnO has been dispersed in the Resins, epoxy uniformly as we can see from the figure.
Fig. 4 is the actual effect figure of four-acicular nanometer ZnO/ epoxide resin wave-absorbing coating.
Embodiment
The coating quality that makes under following experiment condition is better.
Example 1: at first taking by weighing quality is the four-acicular nanometer ZnO of 15g, add right amount alcohol and oleic acid, disperse 10min with ultrasonic echography, every 1gZnO need add 0.1ml oleic acid and 1.5ml alcohol, add the alcohol-soluble Resins, epoxy of 35g then, ultrasonic while stirring 30min, every 1g Resins, epoxy adds 0.05ml alcohol.Heating evaporation falls excessive alcohol, adds the 3.5ml curing agent ethylene diamine again and stirs and ultrasonic elimination bubble, the corresponding 0.1ml quadrol of 1g Resins, epoxy.With the paint spay-coating of making is on the aluminium sheet of 180mm * 180mm * 5mm size in specification, at room temperature solidifies and makes microwave absorbing coating in 2 hours.The thickness of coating can be controlled by the number of times of spraying.The massfraction of ZnO is 30%wt in this coating, and the thickness of coating is 3.5mm.
Example 2: at first taking by weighing quality is the four-acicular nanometer ZnO of 15g, it is joined in the polyamine grease coating material that quality is 35g, 50min is stirred on ultrasonic limit, limit, be that dry at ambient temperature 3h makes microwave absorbing coating on the aluminium sheet of 180mm * 180mm * 5mm size in specification with the paint spay-coating for preparing then.The thickness of coating can be controlled by the number of times of spraying.The massfraction of ZnO is 30%wt in this coating, and the thickness of coating is 3.5mm.
Claims (2)
1, a kind of preparation method of four-needle-shape nano zinc oxide wave absorbing coating is characterized in that, technology is:
(1) aluminium sheet is rinsed well with clean-out system and alcohol, as coated substrate;
(2) take by weighing certain mass four-acicular nanometer ZnO, add thinner, dispersion agent ultra-sonic dispersion 10min; Alcohol is as thinner, and dispersion agent is an oleic acid, the alcohol of every 1g four-acicular nanometer ZnO correspondence 0.05～0.1ml oleic acid and 1～1.5ml;
(3) adding is diluted good Resins, epoxy with alcohol, and 30～40min, every 1g Resins, epoxy correspondence 0.02～0.05ml alcohol are stirred in ultrasonic limit, limit;
(4) add an amount of curing agent ethylene diamine at last, stir and ultrasonic elimination bubble every 1g nano-ZnO correspondence 0.1～0.15ml quadrol;
(5) with the paint spay-coating made on aluminium sheet, self-vulcanizing 2～3h makes microwave absorbing coating; The massfraction of ZnO is 30%～35% in the coating, and coat-thickness is 3～3.5mm, and coat-thickness is controlled by the spraying number of times.
2, in accordance with the method for claim 1, it is characterized in that used four-acicular nanometer ZnO size is even, long 2～5 μ m of needle body, four pin needle body base diameters are between 200～500nm.
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| CN101259463B (en) * | 2008-04-30 | 2010-09-08 | 东北大学 | Preparation of foam aluminum alloy base wave-absorbing material |
| CN102758164B (en) * | 2011-04-25 | 2015-01-07 | 中国农业机械化科学研究院 | Temperature-resistant thermal-spray radar absorbing coating and preparation method of spraying powder thereof |
| CN105111808A (en) * | 2015-09-11 | 2015-12-02 | 江苏瑞雪电子材料有限公司 | Nano wave-absorbing coating material and preparation method thereof |
| CN106588124A (en) * | 2016-11-10 | 2017-04-26 | 西北工业大学 | Low-temperature preparation method of ceramic coating absorbing waves in frequency band of 8-18 GHz |
| CN108976986B (en) * | 2018-06-27 | 2021-02-09 | 常州光辉化工有限公司 | High-solid-content graphene wave-absorbing coating and preparation method thereof |
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