CN104530467A - Preparation method of light bandwidth wave-absorbing material - Google Patents
Preparation method of light bandwidth wave-absorbing material Download PDFInfo
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- CN104530467A CN104530467A CN201510002780.8A CN201510002780A CN104530467A CN 104530467 A CN104530467 A CN 104530467A CN 201510002780 A CN201510002780 A CN 201510002780A CN 104530467 A CN104530467 A CN 104530467A
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Abstract
The invention relates to a preparation method of a light bandwidth wave-absorbing material. A substrate of the light bandwidth wave-absorbing material is soft spongy polyurethane, and then absorbing agents, adhesives and coupling agents are added; the adhesives are dissolved in absolute ethyl alcohol and sufficiently stirred until transparent uniform adhesive liquid cement is obtained through dissolving; the absorbing agents and the appropriate quantity of coupling agents are added to the adhesive liquid cement to obtain absorbing agent liquid cement; the soft spongy polyurethane substrate is dipped in the absorbing agent liquid cement and then is repeatedly lifted and dipped, surplus liquid cement is finally discharged, the dipped substrate is placed in a vacuum drying oven to be dried and is machined according to a specified dimension, and a finished product is obtained. According to the method, processes are simple and efficient, repeatability is good, different wave-absorbing properties can be achieved by changing the liquid cement ratio, the quantity of the absorbing agents, the number of dipping times and the dipping thickness, overall performance is good, surface density is low, and the absorbing frequency band is wide. The light bandwidth wave-absorbing material has an obvious radar wave absorbing effect and has wide application prospects in the radar wave hiding field and the electromagnetic shielding field.
Description
Technical field
The invention belongs to technical field of function materials, be particularly related to a kind of preparation method of lightweight bandwidth absorbing material, be mainly used in thunderstorm activity and electromagnetic shielding.
Background technology
The absorbing material of current research, because of the restriction by absorption agent electromagnetic parameter characteristic and interference absorbing material principle, exists that absorption band is narrow, the quality problem such as heavily.The intrinsic impedance of its reason mainly absorbing material is not mated with space impedance, causes hertzian wave just to there occurs serious reflex action before not entering absorbing material inside.Can realize absorbing material changes wave transparent-suction ripple effect into by single sorption to the porousness of body material on the one hand, optimize impedance matching, significantly can reduce on the other hand the density of material, the requirement of " absorbing material quality light, inhale ripple frequency range covering wide " provides possibility in order realizing.
Be that the foamed polyurethane base wave-absorbing material of absorption agent has relevant report with graphitized carbon black.Patent 10159051.X discloses a kind of lightweight absorbing material foam and preparation method thereof, and it mainly prepares different wave absorbing agent foam base plates by whipping agent, is mainly used in building field.Patent 10021703.8 discloses a kind of preparation method of multilayer foam wave-suction material.But its thickness is comparatively large, is only applicable to the civil areas such as microwave unreflected chamber.From relevant technology and bibliographical information, be that the foamed polyurethane base wave-absorbing material of absorption agent also exists the problems such as thickness is large and constrains its range of application with carbon black.Take flexibel polyurethane as matrix, iron carbonyl/graphitized carbon black is that the research of the absorbing material of absorption agent have not been reported.
Summary of the invention
For above-mentioned prior art present situation, the invention provides a kind of is matrix with urethane, and iron carbonyl/graphitized carbon black is the preparation method of the lightweight bandwidth absorbing material of absorption agent.
Now design of the present invention and technical solution are described below:
Basic conception of the present invention is, iron carbonyl is a kind of the most frequently used magnetic absorbent, appropriate iron carbonyl is added in absorbing material, effectively can improve the electromagnetic parameter with controlled material, graphitized carbon black is except having good absorbing property, also have light compared with the quality of iron carbonyl and the characteristic that ripple matrix blending inhaled by iron carbonyl and urethane can be increased, under the prerequisite of the electrical parameter characteristic not reducing absorbing material, make absorbing material quality lighter in order to reaching, inhale the object that ripple frequency band is wider, it is matrix that the present invention proposes with flexibel polyurethane, iron carbonyl/graphitized carbon black is absorbent preparation technological line, be expected to overcome shortcoming of the prior art, obtain the absorbing material of overall performance excellence.
A kind of lightweight bandwidth of the present invention absorbing material, it is characterized in that: with soft sponge-like polyurethane for matrix, add absorption agent, coupling agent, tackiness agent, regulated and controled the absorbing property of lightweight bandwidth absorbing material by the thickness and dipping number of times changing soft sponge-like polyurethane matrix; Concrete preparation method comprises the following steps:
Step 1: take absorption agent, tackiness agent, coupling agent and dehydrated alcohol; Tackiness agent is dissolved in dehydrated alcohol, is stirred well to after being dissolved as transparent homogeneous tackiness agent glue for subsequent use;
Step 2: absorption agent and coupling agent are joined in above-mentioned tackiness agent glue, abundant mechanical stirring is also ultrasonic, obtained absorption agent glue;
Step 3: by soft sponge-like polyurethane matrix impregnates in above-mentioned absorption agent glue after 4 ~ 8 minutes, lift out absorption agent glue liquid level, again flood after to be absorbed dose of no longer lower of glue, repeatable operation 2 ~ 8 times, finally the saturated soft sponge-like polyurethane base wave-absorbing material that impregnated of absorption agent glue is lifted out, nature draining excess glue, is placed in 30 DEG C ~ 60 DEG C vacuum drying ovens and dries;
Step 4: by dry soft sponge-like polyurethane base wave-absorbing material according to the rules size process, namely obtain finished product.
The present invention further provides a kind of preparation method of lightweight bandwidth absorbing material, it is characterized in that: described absorption agent is the mixture of graphitized carbon black and iron carbonyl, its mass ratio is 3:4; Described tackiness agent is acrylic resin; Described coupling agent is silane.
The present invention further provides a kind of preparation method of lightweight bandwidth absorbing material, it is characterized in that: described absorption agent is 75 ~ 85 quality %, described tackiness agent is 7 ~ 21 quality %, described coupling agent 4 ~ 8 quality %, take dehydrated alcohol as benchmark 100 quality %.
The present invention further provides a kind of preparation method of lightweight bandwidth absorbing material, it is characterized in that: absorption agent and coupling agent are joined abundant mechanical stirring in the glue of tackiness agent and dehydrated alcohol and the ultrasonic time is 30 ~ 45min.
Beneficial effect of the present invention is: the absorbing property of lightweight bandwidth foam wave-suction material can by changing glue proportioning, absorption agent consumption, dipping number of times, flooding thickness and have different absorbing properties, and overall performance is good, and area density is low, absorbs frequency range wide.This technique is simply efficient, favorable repeatability, to thunderstorm activity successful, shows it in the wide application prospect in radar wave camouflage field and electromagnetic shielding field.
Accompanying drawing explanation
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
By the following examples the preparation of lightweight bandwidth absorbing material of the present invention is further described.
Embodiment 1
Step 1: accurately take graphitized carbon black and iron carbonyl mixture 85g, acrylic resin 7g, silane coupling agent 8g and dehydrated alcohol 100g; Acrylic resin is dissolved in dehydrated alcohol, is stirred well to and is dissolved as transparent uniform solution;
Step 2: graphitized carbon black and silane coupling agent are joined in above-mentioned tackiness agent glue, mechanical stirring ultrasonic 30min, obtained absorption agent glue;
Step 3: be that the flexibel polyurethane of 6mm impregnated in above-mentioned glue by thickness, filtrate after lift, then again floods, repeatedly carry out 4 times, last draining excess glue, and be placed in 40 DEG C of vacuum drying ovens and dry;
Step 4: the flexibel polyurethane base foam wave-suction material of drying is processed according to " GJB2038-94 " specified dimension, namely obtains finished product.
Embodiment 2
Step 1: accurately take graphitized carbon black and iron carbonyl mixture 75g, acrylic resin 21g, silane coupling agent 4g and dehydrated alcohol 100g; Acrylic resin is dissolved in dehydrated alcohol, is stirred well to and is dissolved as transparent uniform solution;
Step 2: graphitized carbon black and silane coupling agent are joined in above-mentioned tackiness agent glue, mechanical stirring ultrasonic 45min, obtained absorption agent glue;
Step 3: be that the flexibel polyurethane of 3mm impregnated in above-mentioned glue by thickness, filtrate after lift, then again floods, repeatedly carry out 3 times, last draining excess glue, and be placed in 40 DEG C of vacuum drying ovens and dry;
Step 4: the flexibel polyurethane base foam wave-suction material of drying is processed according to " GJB2038-94 " specified dimension, namely obtains finished product.
As seen from Figure 3, the absorbing property of the lightweight bandwidth absorbing material of this example preparation is good, and thickness is 3mm, and when flooding 3 times, within the scope of 2-18GHz, the absorption frequency range that this absorbing material is less than-5dB reaches 12GHz, and the absorption frequency range being less than-10dB reaches 5GHz.
See Fig. 1: as seen from Figure 1, the lightweight bandwidth absorbing material perforate of this example preparation is even, and form is good.
As seen from Figure 2, the absorbing property of the lightweight bandwidth absorbing material of this example preparation is good, and thickness is 6mm, and when flooding 4 times, within the scope of 2-18GHz, bimodal absorption appears in this absorbing material, and the absorption frequency range being less than-5dB reaches 13GHz.
Above-described embodiment is to explanation of the present invention, not thereby limiting the invention.
Claims (4)
1. the preparation method of a lightweight bandwidth absorbing material, it is characterized in that: with soft sponge-like polyurethane for matrix, add absorption agent, coupling agent, tackiness agent, regulated and controled the absorbing property of lightweight bandwidth absorbing material by the thickness and dipping number of times changing soft sponge-like polyurethane matrix; Concrete preparation method comprises the following steps:
Step 1: take absorption agent, tackiness agent, coupling agent and dehydrated alcohol; Tackiness agent is dissolved in dehydrated alcohol, is stirred well to after being dissolved as transparent homogeneous tackiness agent glue for subsequent use;
Step 2: absorption agent and coupling agent are joined in above-mentioned tackiness agent glue, abundant mechanical stirring is also ultrasonic, obtained absorption agent glue;
Step 3: by soft sponge-like polyurethane matrix impregnates in above-mentioned absorption agent glue after 4 ~ 8 minutes, lift out absorption agent glue liquid level, again flood after to be absorbed dose of no longer lower of glue, repeatable operation 2 ~ 8 times, finally the saturated soft sponge-like polyurethane base wave-absorbing material that impregnated of absorption agent glue is lifted out, nature draining excess glue, is placed in 30 DEG C ~ 60 vacuum drying ovens and dries;
Step 4: by dry soft sponge-like polyurethane base wave-absorbing material according to the rules size process, namely obtain finished product.
2. the preparation method of a kind of lightweight bandwidth absorbing material according to claim 1, it is characterized in that: described absorption agent is the mixture of graphitized carbon black and iron carbonyl, its mass ratio is 3:4; Described tackiness agent is acrylic resin; Described coupling agent is silane.
3. the preparation method of a kind of lightweight bandwidth absorbing material according to claim 2, it is characterized in that: described absorption agent is 75 ~ 85 quality %, described tackiness agent is 7 ~ 21 quality %, described coupling agent 4 ~ 8 quality %, take dehydrated alcohol as benchmark 100 quality %.
4. the preparation method of a kind of lightweight bandwidth absorbing material according to claim 3, is characterized in that: absorption agent and coupling agent are joined abundant mechanical stirring in the glue of tackiness agent and dehydrated alcohol and the ultrasonic time is 30 ~ 45min.
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| CN105400018A (en) * | 2015-12-21 | 2016-03-16 | 中国科学院长春应用化学研究所 | Microporous wave-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 |
| CN108774490A (en) * | 2018-05-31 | 2018-11-09 | 浙江理工大学 | A kind of preparation method of the multiple meso-hole structure wave-absorber of microwave multiband response |
| CN109517216A (en) * | 2018-11-27 | 2019-03-26 | 中国科学院金属研究所 | A kind of iron-base magnetic foam wave-suction material and preparation method thereof with low frequency broadband absorbing property |
| CN111718686A (en) * | 2020-06-11 | 2020-09-29 | 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 |
| CN111969330A (en) * | 2020-07-31 | 2020-11-20 | 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 |
| CN112126116A (en) * | 2020-08-24 | 2020-12-25 | 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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|---|---|---|---|---|
| CN105400018A (en) * | 2015-12-21 | 2016-03-16 | 中国科学院长春应用化学研究所 | Microporous wave-absorbing material with array-structure surface, and preparation method thereof |
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| 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 |
| CN108774490A (en) * | 2018-05-31 | 2018-11-09 | 浙江理工大学 | A kind of preparation method of the multiple meso-hole structure wave-absorber of microwave multiband response |
| 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 |
| CN109517216A (en) * | 2018-11-27 | 2019-03-26 | 中国科学院金属研究所 | A kind of iron-base magnetic foam wave-suction material and preparation method thereof with low frequency broadband absorbing property |
| 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 |
| CN111718686A (en) * | 2020-06-11 | 2020-09-29 | 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 |
| 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 |
| CN111969330A (en) * | 2020-07-31 | 2020-11-20 | 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 |
| CN112126116A (en) * | 2020-08-24 | 2020-12-25 | 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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