CN111244642A - Wave absorbing plate and preparation method thereof - Google Patents
Wave absorbing plate and preparation method thereof Download PDFInfo
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- CN111244642A CN111244642A CN202010043925.XA CN202010043925A CN111244642A CN 111244642 A CN111244642 A CN 111244642A CN 202010043925 A CN202010043925 A CN 202010043925A CN 111244642 A CN111244642 A CN 111244642A
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- wave
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
- H01Q17/004—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems using non-directional dissipative particles, e.g. ferrite powders
Abstract
The invention provides a preparation method of a wave absorbing plate, which comprises the following steps: s1, pretreating an absorbent; s2, preparing a wave-absorbing coating, blending and stirring the absorbent obtained by pretreatment and a binder, and adding a solvent to adjust the viscosity to obtain a mixed wave-absorbing coating; s3, pumping and spraying, namely pumping the wave-absorbing coating and spraying the wave-absorbing coating on a release film; and S4, forming to obtain the wave absorbing plate. The invention also provides a wave absorbing plate. The invention has the beneficial effects that: the prepared coating is directly sprayed and molded by adopting a wet process, the thickness of the wave absorbing plate is controlled by adjusting the flow and the continuous spraying times, and the coil stock can be continuously produced, so that the production efficiency is improved, and the cost is also controlled.
Description
Technical Field
The invention relates to a wave absorbing plate, in particular to a wave absorbing plate and a preparation method thereof.
Background
The traditional wave absorbing plate forming process is dry mixing, namely, the wave absorbing plate is subjected to open-mixing, densification and then calendaring and forming. The absorbent in the traditional formula comprises ferrite, carbonyl iron powder, iron-silicon-aluminum and other magnetic powder. The biggest defect of the dry process is that the mixed materials are not uniform, the absorbent can not be uniformly mixed, the process steps of the method are multiple, the film with the thickness of 0.1mm is difficult to manufacture, a laminating machine or a flat vulcanizing machine is additionally used for secondary processing when a thicker wave absorbing plate is manufactured, and the roll material is difficult to continuously produce. The traditional absorbent is used, and the performance is single.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a wave absorbing plate and a preparation method thereof.
The invention provides a preparation method of a wave absorbing plate, which comprises the following steps:
s1, pretreating an absorbent;
s2, preparing a wave-absorbing coating, blending and stirring the absorbent obtained by pretreatment and a binder, and adding a solvent to adjust the viscosity to obtain a mixed wave-absorbing coating;
s3, pumping and spraying, namely pumping the wave-absorbing coating and spraying the wave-absorbing coating on a release film;
and S4, forming to obtain the wave absorbing plate.
As a further improvement of the invention, in step S1, deionized water is added to sendust or carbonyl iron powder and nano carbon powder, the mechanical stirring is carried out for 1 h, then nano ferroferric oxide is added, the stirring is carried out for 5 h, the filtration is carried out, the leaching is carried out by absolute ethyl alcohol, the obtained product is put into a vacuum drying oven to be dried for 5 h at 60 ℃, and the obtained product is taken out after the temperature is reduced to room temperature, thus obtaining the absorbent.
As a further improvement of the present invention, in step S1, the absorbent is mixed in the following ratio: 60-100 parts of iron-silicon-aluminum or carbonyl iron powder, 5-25 parts of nano ferroferric oxide and 2-15 parts of nano carbon powder.
As a further improvement of the invention, in step S3, the coating is pumped by a peristaltic pump and sprayed out by a spraying coating head to be attached on the release film.
As a further improvement of the invention, in step S4, the release film adhered with the wave-absorbing coating is passed through a plurality of ovens successively for continuous drying in a tensioning and rolling transmission manner, the temperature of the ovens is 40 ℃ to 70 ℃, the temperature of the ovens is set to be sequentially increased and then sequentially decreased according to the passing sequence of the release film, that is, the temperature of the oven in the middle is highest and gradually decreased towards two sides.
As a further improvement of the invention, a spraying coating head is inserted between the ovens to increase the thickness of the spraying, and if the thickness of the spraying does not reach the requirement, the spraying is continuously carried out until the thickness reaches the requirement and then the roller is rolled.
As a further improvement of the present invention, in step S2, the wave-absorbing coating is mixed according to the following ratio: 60-90 parts of absorbent, 10-40 parts of binder, 1-5 parts of surfactant, 1-5 parts of flatting agent, 1-5 parts of anti-settling agent and 30-60 parts of solvent.
As a further improvement of the invention, the binder comprises polyurethane or acrylic resin, and the solvent comprises butanone and ethyl acetate.
The invention also provides a wave absorbing plate which mainly comprises the following components: 60-90 parts of absorbent, 10-40 parts of binder, 1-5 parts of surfactant, 1-5 parts of flatting agent, 1-5 parts of anti-settling agent and 30-60 parts of solvent.
As a further development of the invention, the absorbent consists essentially of: 60-100 parts of iron-silicon-aluminum or carbonyl iron powder, 5-25 parts of nano ferroferric oxide and 2-15 parts of nano carbon powder; the adhesive comprises polyurethane or acrylic resin, and the solvent comprises butanone and ethyl acetate.
The invention has the beneficial effects that: by adopting the scheme and adopting a wet process, the prepared coating can be directly sprayed and formed, the thickness of the wave absorbing plate is controlled by adjusting the flow and the continuous spraying times, the coil stock can be continuously produced, the production efficiency is improved, and the cost is also controlled.
Drawings
FIG. 1 is a flow chart of a method for fabricating a wave-absorbing plate according to the present invention.
FIG. 2 is a coating process diagram of a method for manufacturing a wave-absorbing plate according to the present invention.
FIG. 3 is a data graph of a wave plate according to the present invention.
Detailed Description
The invention is further described with reference to the following description and embodiments in conjunction with the accompanying drawings.
As shown in fig. 1 to 3, a method for manufacturing a wave-absorbing plate includes the following steps:
s1, pretreating an absorbent;
s2, preparing a wave-absorbing coating, blending and stirring the absorbent obtained by pretreatment and a binder, and adding a solvent to adjust the viscosity to obtain a mixed wave-absorbing coating (namely the mixed coating in the figure 1);
s3, pumping and spraying, namely pumping the wave-absorbing coating and spraying the wave-absorbing coating on the release film 3;
and S4, forming to obtain the wave absorbing plate.
In step S1, deionized water is added to sendust or carbonyl iron powder and nano carbon powder, the mixture is mechanically stirred for 1 hour, then nano ferroferric oxide is added, the mixture is stirred for 5 hours, the filtration is carried out, the leaching is carried out by absolute ethyl alcohol, the leaching is carried out in a vacuum drying oven at 60 ℃, the drying is carried out for 5 hours, and the absorbent is obtained after the temperature is reduced to room temperature.
In step S1, the absorbent is mixed in the following ratio: 60-100 parts of iron-silicon-aluminum or carbonyl iron powder, 5-25 parts of nano ferroferric oxide and 2-15 parts of nano carbon powder.
In step S3, the coating is pumped by a peristaltic pump and sprayed out by the spray coating head 1 to adhere to the release film 3.
In step S4, the release film 1 with the wave-absorbing coating attached thereon is passed through a plurality of ovens 2 in sequence for continuous drying in a tensioning and rolling transmission manner, the temperature of the ovens 2 is 40 ℃ to 70 ℃, and the temperatures of the ovens 2 are sequentially increased and then decreased according to the sequence of passing the release film 3, that is, the temperature of the oven 2 located in the middle is the highest and gradually decreased toward the two sides, preferably, 5 sections of ovens 2 are sequentially set at 40 ℃, 60 ℃, 70 ℃, 60 ℃ and 40 ℃.
And (3) inserting the spraying coating heads 1 between the ovens 2 to increase the thickness of the spraying, and if the thickness of the spraying does not meet the requirement, continuously spraying until the thickness meets the requirement, and rolling again, for example, a spraying line comprises 2 spraying heads in front of and behind, one spraying head is arranged at the tail, and when the thickness of the primary spraying does not meet the requirement, the tail is continuously sprayed for the second time.
In step S2, the wave-absorbing coating is mixed in the following proportions: 60-90 parts of absorbent, 10-40 parts of binder, 1-5 parts of surfactant, 1-5 parts of flatting agent, 1-5 parts of anti-settling agent and 30-60 parts of solvent.
The binder comprises polyurethane or acrylic resin, and the solvent comprises butanone and ethyl acetate.
The invention also provides a wave absorbing plate which mainly comprises the following components: 60-90 parts of absorbent, 10-40 parts of binder, 1-5 parts of surfactant, 1-5 parts of flatting agent, 1-5 parts of anti-settling agent and 30-60 parts of solvent.
The absorbent mainly comprises the following components: 60-100 parts of iron-silicon-aluminum or carbonyl iron powder, 5-25 parts of nano ferroferric oxide and 2-15 parts of nano carbon powder; the adhesive comprises polyurethane or acrylic resin, and the solvent comprises butanone and ethyl acetate.
According to the wave absorbing plate and the preparation method thereof, a wet process is adopted, the prepared coating is directly sprayed and formed, the thickness of the wave absorbing plate is controlled by adjusting the flow and the continuous spraying times, the coil stock can be continuously produced, the production efficiency is improved, and the cost is controlled.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. A method for preparing a wave absorbing plate is characterized by comprising the following steps: the method comprises the following steps:
s1, pretreating an absorbent;
s2, preparing a wave-absorbing coating, blending and stirring the absorbent obtained by pretreatment and a binder, and adding a solvent to adjust the viscosity to obtain a mixed wave-absorbing coating;
s3, pumping and spraying, namely pumping the wave-absorbing coating and spraying the wave-absorbing coating on a release film;
and S4, forming to obtain the wave absorbing plate.
2. The method for producing a wave-absorbing plate according to claim 1, wherein: in step S1, deionized water is added to sendust or carbonyl iron powder and nano carbon powder, the mixture is mechanically stirred for 1 hour, then nano ferroferric oxide is added, the mixture is stirred for 5 hours, the filtration is carried out, the leaching is carried out by absolute ethyl alcohol, the leaching is carried out in a vacuum drying oven at 60 ℃, the drying is carried out for 5 hours, and the absorbent is obtained after the temperature is reduced to room temperature.
3. The method for producing a wave-absorbing plate according to claim 2, wherein: in step S1, the absorbent is mixed in the following ratio: 60-100 parts of iron-silicon-aluminum or carbonyl iron powder, 5-25 parts of nano ferroferric oxide and 2-15 parts of nano carbon powder.
4. The method for producing a wave-absorbing plate according to claim 1, wherein: in step S3, the coating is pumped by a peristaltic pump and sprayed out by a spray coating head to adhere to the release film.
5. The method for preparing a wave-absorbing plate according to claim 4, wherein: in step S4, the release film with the wave-absorbing coating attached thereon is passed through a plurality of ovens successively for continuous drying in a tension and rolling transmission manner, the temperature of the ovens is 40 ℃ to 70 ℃, the temperature of the ovens is set to be sequentially increased and then sequentially decreased according to the order of passing the release film, that is, the temperature of the oven in the middle is highest and gradually decreased toward both sides.
6. The method for producing a wave-absorbing plate according to claim 5, wherein: and inserting a spraying coating head between the ovens to increase the thickness of the spraying, and if the thickness of the spraying does not meet the requirement, continuously spraying until the thickness meets the requirement and then rolling.
7. The method for producing a wave-absorbing plate according to claim 1, wherein: in step S2, the wave-absorbing coating is mixed in the following proportions: 60-90 parts of absorbent, 10-40 parts of binder, 1-5 parts of surfactant, 1-5 parts of flatting agent, 1-5 parts of anti-settling agent and 30-60 parts of solvent.
8. The method for producing a wave-absorbing plate according to claim 7, wherein: the binder comprises polyurethane or acrylic resin, and the solvent comprises butanone and ethyl acetate.
9. A wave absorbing plate is characterized by mainly comprising the following components: 60-90 parts of absorbent, 10-40 parts of binder, 1-5 parts of surfactant, 1-5 parts of flatting agent, 1-5 parts of anti-settling agent and 30-60 parts of solvent.
10. The wave absorbing plate of claim 9 wherein the absorber consists essentially of: 60-100 parts of iron-silicon-aluminum or carbonyl iron powder, 5-25 parts of nano ferroferric oxide and 2-15 parts of nano carbon powder; the adhesive comprises polyurethane or acrylic resin, and the solvent comprises butanone and ethyl acetate.
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| CN202010043925.XA CN111244642A (en) | 2020-01-16 | 2020-01-16 | Wave absorbing plate and preparation method thereof |
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| CN202010043925.XA CN111244642A (en) | 2020-01-16 | 2020-01-16 | Wave absorbing plate and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113043703A (en) * | 2021-04-08 | 2021-06-29 | 天津工业大学 | Preparation method of polyurethane/ferroferric oxide/fibrofelt flexible noise reduction composite material |
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| CN103396762A (en) * | 2013-08-05 | 2013-11-20 | 中国科学院合肥物质科学研究院 | Wave-absorbing material and preparation method thereof |
| CN103725073A (en) * | 2013-12-31 | 2014-04-16 | 张锦碧 | Camouflage coating |
| CN104163919A (en) * | 2014-07-25 | 2014-11-26 | 北京科技大学 | Polyaniline/oxidized graphene/ferriferrous oxide absorbing material and preparation method |
| CN105199169A (en) * | 2015-11-02 | 2015-12-30 | 浙江欧仁新材料有限公司 | Wave absorbing material and preparation method thereof |
| CN108260337A (en) * | 2018-01-11 | 2018-07-06 | 深圳市佰瑞兴实业有限公司 | A kind of wave absorbing patch and preparation method |
| CN109041556A (en) * | 2018-07-16 | 2018-12-18 | 苏州微磁新材料有限公司 | Absorbing material and its preparation method and application |
| CN109648952A (en) * | 2019-01-04 | 2019-04-19 | 北京环境特性研究所 | A kind of gradient type graphite oxide alkenyl structures absorbing material and preparation method thereof |
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2020
- 2020-01-16 CN CN202010043925.XA patent/CN111244642A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090016025A1 (en) * | 2002-10-21 | 2009-01-15 | Laird Technologies, Inc. | Thermally conductive emi shield |
| CN101440250A (en) * | 2007-11-21 | 2009-05-27 | 崔悦 | Radar invisible coating |
| CN103396762A (en) * | 2013-08-05 | 2013-11-20 | 中国科学院合肥物质科学研究院 | Wave-absorbing material and preparation method thereof |
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| CN108260337A (en) * | 2018-01-11 | 2018-07-06 | 深圳市佰瑞兴实业有限公司 | A kind of wave absorbing patch and preparation method |
| CN109041556A (en) * | 2018-07-16 | 2018-12-18 | 苏州微磁新材料有限公司 | Absorbing material and its preparation method and application |
| CN109648952A (en) * | 2019-01-04 | 2019-04-19 | 北京环境特性研究所 | A kind of gradient type graphite oxide alkenyl structures absorbing material and preparation method thereof |
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| CN113043703A (en) * | 2021-04-08 | 2021-06-29 | 天津工业大学 | Preparation method of polyurethane/ferroferric oxide/fibrofelt flexible noise reduction composite material |
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