CN104530467B - A kind of preparation method of lightweight bandwidth absorbing material - Google Patents
A kind of preparation method of lightweight bandwidth absorbing material Download PDFInfo
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- CN104530467B CN104530467B CN201510002780.8A CN201510002780A CN104530467B CN 104530467 B CN104530467 B CN 104530467B CN 201510002780 A CN201510002780 A CN 201510002780A CN 104530467 B CN104530467 B CN 104530467B
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- glue
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- absorbing material
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Abstract
The present invention relates to a kind of preparation method of lightweight bandwidth absorbing material, its matrix is soft sponge-like polyurethane, adds absorbent, adhesive and coupling agent；Adhesive is dissolved in absolute ethyl alcohol, is stirred well to and is dissolved as transparent homogeneous adhesive glue liquid；Absorbent and suitable coupling agent are added in above-mentioned adhesive glue absorbent glue is made；Lift, impregnate repeatedly after soft sponge-like polyurethane matrix is impregnated in absorbent glue, finally exhaust unnecessary glue, be placed in vacuum drying chamber and dry, be processed, get product according to regulation size.Present invention process is simply efficient, reproducible, can by varying glue proportioning, absorbent dosage, dipping time, dipping thickness and there is different absorbing properties, overall performance is good, and surface density is low, absorption frequency range it is wide.To thunderstorm activity positive effect, have broad application prospects in radar wave camouflage field and electromagnetic shielding field.
Description
Technical field
The invention belongs to technical field of function materials, and in particular to and it is a kind of preparation method of lightweight bandwidth absorbing material,
It is mainly used in thunderstorm activity and electromagnetic shielding.
Background technology
The absorbing material studied at present is deposited because being limited by absorbent electromagnetic parameter characteristic and interference absorbing material principle
Absorption band is narrow, quality weight the problems such as.Its reason is mainly that the characteristic impedance of absorbing material and space impedance mismatch, and is caused
Just there occurs serious reflex before being introduced into inside absorbing material for electromagnetic wave.The porosity of basis material on the one hand can be with
Realize that absorbing material is changed into wave transparent-suction ripple by single absorption and acts on, optimize impedance matching, on the other hand can be significantly
Degree reduces the density of material, to realize that the requirement of " absorbing material light weight, the section covering of suction wave frequency are wide " provides possibility.
Foamed polyurethane base wave-absorbing material using conductive black as absorbent has relevant report.Patent 10159051.X is public
A kind of lightweight absorbing material foam and preparation method thereof is opened, it mainly prepares different wave absorbing agent foams by foaming agent
Matrix, is mainly used in building field.Patent 10021703.8 discloses a kind of preparation method of multilayer foam wave-suction material.But
It is that its thickness is larger, is only applicable to the civil fields such as microwave dark room.From the point of view of relevant technology and document report, using carbon black as suction
Receive agent foamed polyurethane base wave-absorbing material there is also thickness it is big the problems such as restrict its application scope.Using flexibel polyurethane as base
Body, carbonyl iron/conductive black have not been reported for the research of the absorbing material of absorbent.
The content of the invention
For above-mentioned state of the art, the present invention provides one kind using polyurethane as matrix, and carbonyl iron/conductive black is suction
Receive the preparation method of the lightweight bandwidth absorbing material of agent.
Now present inventive concept and technical solution are described below：
The basic conception of the present invention is that carbonyl iron is a kind of most common magnetic absorbent, is added in absorbing material suitable
The carbonyl iron of amount, can effectively improve the electromagnetic parameter with controlled material, conductive black is except with good absorbing property
Outside, also there is the light weight compared with carbonyl iron and the characteristic that carbonyl iron and polyurethane inhale ripple matrix blending can be increased, in order to up to
Make absorbing material quality lighter on the premise of the electrical parameter characteristic of absorbing material is not reduced, inhale the broader purpose of wave frequency band,
The present invention proposes that using flexibel polyurethane as matrix carbonyl iron/conductive black is absorbent technology of preparing route, is expected to overcome existing
The shortcomings that in technology, obtain the excellent absorbing material of overall performance.
A kind of lightweight bandwidth absorbing material of the present invention, it is characterised in that：Using soft sponge-like polyurethane as matrix, add and inhale
Agent, coupling agent, adhesive are received, is inhaled by varying thickness and dipping time the regulation and control lightweight bandwidth of soft sponge-like polyurethane matrix
The absorbing property of wave material；Specific preparation method comprises the following steps：
Step 1：Weigh absorbent, adhesive, coupling agent and absolute ethyl alcohol；Adhesive is dissolved in absolute ethyl alcohol, fully
Stirring is spare after transparent homogeneous adhesive glue to being dissolved as；
Step 2：Absorbent and coupling agent are added in above-mentioned adhesive glue, abundant mechanical agitation and ultrasound, are made
Absorbent glue；
Step 3：Soft sponge-like polyurethane matrix was impregnated in above-mentioned absorbent glue after 4~8 minutes, lifts out suction
Agent glue liquid level is received, impregnates, operates 2~8 times repeatedly, finally by saturation impregnated of suction again after the no longer lower drop of to be absorbed dose of glue
The soft sponge-like polyurethane base wave-absorbing material for receiving agent glue lifts out, exhausts unnecessary glue naturally, is placed in 30 DEG C~60 DEG C very
Dried in empty drying box；
Step 4：The soft sponge-like polyurethane base wave-absorbing material of drying is processed according to regulation size, that is, is obtained into
Product.
The present invention further provides a kind of preparation method of lightweight bandwidth absorbing material, it is characterised in that：The absorption
Agent is conductive black and the compound of carbonyl iron, its mass ratio is 3：4；The adhesive is acrylic resin；The idol
Connection agent is silane.
The present invention further provides a kind of preparation method of lightweight bandwidth absorbing material, it is characterised in that：The absorbent
It is 7~21 mass % for 75~85 mass %, the adhesive, 4~8 mass % of the coupling agent, on the basis of absolute ethyl alcohol
100 mass %.
The present invention further provides a kind of preparation method of lightweight bandwidth absorbing material, it is characterised in that：By absorbent and
Coupling agent is added to abundant mechanical agitation in the glue of adhesive and absolute ethyl alcohol and the ultrasonic time is 30~45min.
The beneficial effects of the present invention are：The absorbing property of lightweight bandwidth foam wave-suction material can match somebody with somebody by varying glue
Than, absorbent dosage, dipping time, dipping thickness and there is different absorbing properties, overall performance is good, and surface density is low, suction
It is wide to receive frequency range.The technique is simply efficient, favorable repeatability, to thunderstorm activity positive effect, it is shown that it is in radar wave camouflage
The field application prospect wide with electromagnetic shielding field.
Brief description of the drawings
Fig. 1 is the pictorial diagram of lightweight bandwidth absorbing material prepared by the embodiment of the present invention 1.
Fig. 2 is the absorbing property test of lightweight bandwidth absorbing material prepared by the embodiment of the present invention 1.
Fig. 3 is the absorbing property test of lightweight bandwidth absorbing material prepared by the embodiment of the present invention 2.
Specific implementation method
The preparation to lightweight bandwidth absorbing material of the present invention is further described by the following examples.
Embodiment 1
Step 1：Accurately weigh conductive black and carbonyl iron mixture 85g, acrylic resin 7g, silane coupling agent 8g and nothing
Water-ethanol 100g；Acrylic resin is dissolved in absolute ethyl alcohol, is stirred well to and is dissolved as transparent uniform solution；
Step 2：Conductive black and silane coupling agent are added in above-mentioned adhesive glue, mechanical agitation and ultrasound
30min, is made absorbent glue；
Step 3：The flexibel polyurethane that thickness is 6mm is impregnated in above-mentioned glue, filtrate after lifting, then soaks again
Stain, is repeated 4 times, finally exhausts unnecessary glue, is placed in drying in 40 DEG C of vacuum drying chambers；
Step 4：By the flexibel polyurethane base foam wave-suction material of drying according to《GJB2038-94》Given size is added
Work, that is, obtain finished product.
Embodiment 2
Step 1：It is accurate weigh conductive black and carbonyl iron mixture 75g, acrylic resin 21g, silane coupling agent 4g and
Absolute ethyl alcohol 100g；Acrylic resin is dissolved in absolute ethyl alcohol, is stirred well to and is dissolved as transparent uniform solution；
Step 2：Conductive black and silane coupling agent are added in above-mentioned adhesive glue, mechanical agitation and ultrasound
45min, is made absorbent glue；
Step 3：The flexibel polyurethane that thickness is 3mm is impregnated in above-mentioned glue, filtrate after lifting, then soaks again
Stain, is repeated 3 times, finally exhausts unnecessary glue, is placed in drying in 40 DEG C of vacuum drying chambers；
Step 4：By the flexibel polyurethane base foam wave-suction material of drying according to《GJB2038-94》Given size is added
Work, that is, obtain finished product.
As seen from Figure 3, the absorbing property of lightweight bandwidth absorbing material prepared by this example is good, thickness 3mm, impregnates 3 times
When, in the range of 2-18GHz, absorption bandwidth of the absorbing material less than -5dB reaches 12GHz, the absorption bandwidth less than -10dB
Reach 5GHz.
Referring to Fig. 1：As seen from Figure 1, the lightweight bandwidth absorbing material perforate that prepared by this example is uniform, and form is good.
From Figure 2 it can be seen that the absorbing property of lightweight bandwidth absorbing material prepared by this example is good, thickness 6mm, impregnates 4 times
When, in the range of 2-18GHz, which there is bimodal absorption, and the absorption bandwidth less than -5dB reaches 13GHz.
Above-described embodiment is the description of the invention, not thereby limiting the invention.
Claims (2)
- A kind of 1. preparation method of lightweight bandwidth absorbing material, it is characterised in that：Using soft sponge-like polyurethane as matrix, add Absorbent, coupling agent, adhesive, regulate and control lightweight bandwidth by varying the thickness and dipping time of soft sponge-like polyurethane matrix The absorbing property of absorbing material；Specific preparation method comprises the following steps：Step 1：Weigh absorbent, adhesive, coupling agent and absolute ethyl alcohol；Adhesive is dissolved in absolute ethyl alcohol, is sufficiently stirred It is spare after transparent homogeneous adhesive glue to being dissolved as；The absorbent is the compound of conductive black and carbonyl iron, its Mass ratio is 3：4；The adhesive is acrylic resin；The coupling agent is silane；Step 2：Absorbent and coupling agent are added in above-mentioned adhesive glue, abundant mechanical agitation and ultrasound, are made and absorb Agent glue；Step 3：Soft sponge-like polyurethane matrix was impregnated in above-mentioned absorbent glue after 4~8 minutes, lifts out absorbent Glue liquid level, to be absorbed dose of glue impregnate again after no longer dripping down, operate 2~8 times repeatedly, finally by saturation impregnated of absorbent The soft sponge-like polyurethane base wave-absorbing material of glue lifts out, exhausts unnecessary glue naturally, is placed in 30 DEG C~60 vacuum drying Dried in case；Step 4：The soft sponge-like polyurethane base wave-absorbing material of drying is processed according to regulation size, that is, obtains finished product； The absorbent is 75~85 mass %, the adhesive is 7~21 mass %, 4~8 mass % of the coupling agent；With anhydrous 100 mass % on the basis of ethanol.
- A kind of 2. preparation method of lightweight bandwidth absorbing material according to claim 1, it is characterised in that：By absorbent and Coupling agent is added to abundant mechanical agitation in the glue of adhesive and absolute ethyl alcohol and the ultrasonic time is 30~45min.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105400018B (en) * | 2015-12-21 | 2017-07-28 | 中国科学院长春应用化学研究所 | Micropore absorbing material with array structure surface and preparation method thereof |
| CN106374233A (en) * | 2016-12-06 | 2017-02-01 | 周潇潇 | High-efficiency wave absorbing composite material |
| CN106750504A (en) * | 2017-01-22 | 2017-05-31 | 常州烯谷石墨烯科技有限公司 | The preparation method of wideband wave absorbing material |
| CN108774490B (en) * | 2018-05-31 | 2021-05-11 | 浙江理工大学 | Preparation method of microwave multi-band response multiple mesoporous structure wave absorber |
| CN109517216B (en) * | 2018-11-27 | 2021-07-06 | 中国科学院金属研究所 | Iron-based magnetic foam wave-absorbing material with low-frequency broadband wave-absorbing performance and preparation method thereof |
| CN111718686B (en) * | 2020-06-11 | 2024-01-09 | 中国科学院宁波材料技术与工程研究所 | Light composite wave-absorbing material and preparation method thereof |
| CN111969330B (en) * | 2020-07-31 | 2023-02-10 | 航天科工武汉磁电有限责任公司 | Radar wave-absorbing material with unit structure pattern and preparation method thereof |
| CN112126116B (en) * | 2020-08-24 | 2022-10-11 | 航天特种材料及工艺技术研究所 | Wave-absorbing polyurethane sponge/hard foam composite material and preparation method thereof |
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| CN102977587A (en) * | 2012-12-25 | 2013-03-20 | 中国人民解放军总参谋部工程兵科研三所 | Foaming type polyurethane wave-absorbing material and preparation method thereof |
| CN103044704A (en) * | 2013-01-22 | 2013-04-17 | 南京南大波平电子信息有限公司 | Fully-perforated microwave absorbing material and preparation method thereof |
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