CN110483835A - Absorbing material for the test of 77GHz millimetre-wave radar - Google Patents
Absorbing material for the test of 77GHz millimetre-wave radar Download PDFInfo
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- CN110483835A CN110483835A CN201910780414.3A CN201910780414A CN110483835A CN 110483835 A CN110483835 A CN 110483835A CN 201910780414 A CN201910780414 A CN 201910780414A CN 110483835 A CN110483835 A CN 110483835A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/36—After-treatment
- C08J9/40—Impregnation
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2475/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/02—Organic and inorganic ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/322—Ammonium phosphate
- C08K2003/323—Ammonium polyphosphate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/001—Conductive additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
- C08K3/042—Graphene or derivatives, e.g. graphene oxides
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Abstract
The present invention relates to the processing that absorbing material technical field more particularly to frequency electromagnetic waves test use absorbing material.Absorbing material of the present invention forms after conductive feed liquid is immersed substrate by way of roll squeezer roll-in substrate；Substrate is made of percent opening of 90% polyurethane sponge, comprising: substrate and mastoid process structure；Substrate is that height is 20mm rectangular plate-like structure, and in one side, array is machined with the mastoid process structure that several height are 55；The line space and column pitch on mastoid process structure vertex are 35mm.Roll squeezer is three-roller linkage structure, and upper parallel two roller is controlled by roller spacing in 1.5 millimeters of control feeding coals, and lower vertical two roller is pressure of 5 millimeters of controls to substrate by control roller spacing.In roll-in, mastoid process structure is opposite buckles well, with the roll-in repeatedly of roll squeezer tow sides.Technical solution of the present invention solves the problems, such as that existing absorbing material in the prior art is unable to satisfy the testing requirement of 77GHz millimeter wave.
Description
Technical field
The present invention relates to the processing that absorbing material technical field more particularly to frequency electromagnetic waves test use absorbing material.
Background technique
In the automotive field of fast development today, millimetre-wave radar is because of its long transmission distance, the big laboured breathing in transmission window
Subtract and be lost low, penetrability is strong, can satisfy requirement of the vehicle to the adaptability of whole day weather, take the lead in becoming ADAS system and from
The dynamic main sensors driven.Domestic and international mainstream automotive millimetre-wave radar frequency range is 24GHz (for brachymedial apart from radar 15-30
Rice) and 77GHz (for long range radar, 100-200 meters), wherein 77GHz millimetre-wave radar volume is smaller, detection accuracy more
Height, detection range are longer, and developed country has all started to upgrade to 77GHz and switch.With the application of high-frequency radar, to applicable height
The demand of the absorbing material of frequency radar test is also increasing.Traditional absorbing material is generally only applicable to frequency in 40GHz
Test below, the testing requirement without being able to satisfy 77GHz.
For it is above-mentioned the problems of in the prior art, researching and designing is a kind of novel to be used for 77GHz millimetre-wave radar
The absorbing material of test, so that it is very necessary for overcoming the problems of in the prior art.
Summary of the invention
Frequency is generally only applicable in 40GHz test below, Wu Faman according to traditional absorbing material set forth above
The technical issues of testing requirement of sufficient 77GHz millimeter wave, and a kind of suction wave material for the test of 77GHz millimetre-wave radar is provided
Material.Mainly single side papillary is made as substrate using the polyurethane sponge that percent opening is 90% in the present invention, passes through roll-in mode
Conductive material liquid is pressed into substrate and is obtained, to play the testing requirement for meeting 77GHz millimeter wave.
The technological means that the present invention uses is as follows:
It is a kind of for 77GHz millimetre-wave radar test absorbing material be will be conductive by way of roll squeezer roll-in substrate
Feed liquid forms after immersing substrate；
Further, substrate is made of open-cell polyurethane sponge, comprising: substrate and mastoid process structure；Substrate is rectangular plate-like
Structure, in one side, array is machined with several mastoid process structures.
Further, the percent opening of substrate is 90%.
Further, the height of substrate is 15-25mm.
Further, the height of mastoid process structure is 55-65mm.
Further, the line space Yu column pitch on mastoid process structure vertex are 35mm.
Further, the conductive material formula of liquid for the absorbing material of 77GHz millimetre-wave radar test includes:
Water: 40-50%；
Dispersing agent: 1.3-1.7%；
Defoaming agent: 0.2-0.3%；
Acetylene carbon black: 1.5-2.5%；
Graphene: 0.2-1%；
Aluminium hydroxide: 8.5-9.5%；
Ammonium polyphosphate: 3-4%；
Elastic polyurethane feed liquid: 35.3-41%.
Further, the conductive material liquid and preparation method thereof for the absorbing material of 77GHz millimetre-wave radar test, feature exist
In, it is described the preparation method comprises the following steps:
A, it weighs: weighing out each component material as needed；
B, it stirs: sequentially adding dispersing agent, defoaming agent, acetylene carbon black, graphene, aluminium hydroxide and polyphosphoric acid in water
Ammonium is stirred 2 hours under conditions of 2500r/min with high speed disperser；
C, it grinds: feed liquid obtained in step B being ground 2 hours with sand mill again, obtains material of the partial size less than 5 microns
Liquid；
D, it feeds: elastic polyurethane feed liquid being added in the feed liquid obtained in step C, stirs 15 under the conditions of 300r/min
Minute, obtain dipping feed liquid.
Further, roll squeezer be three-roller linkage structure, upper parallel two roller by roller spacing control feeding coal, lower vertical two
Roller controls the pressure to substrate by roller spacing.Obtained product, feed liquid are evenly distributed, and have continuous conduction gradient, more have
Conducive to the absorption of high frequency.
Further, substrate mastoid process structure in roll-in is opposite buckles well, with the roll-in repeatedly of roll squeezer tow sides.On the one hand
Production efficiency is improved, on the other hand makes the product of rod pressure more evenly, with roll squeezer face rod pressure repeatedly anyway, in this way, feed liquid one
Point point equably penetrates into mastoid process structure, so that each component is uniformly distributed in mastoid process structure, reduction is unevenly distributed to high frequency
The influence of test.
Compared with the prior art, the invention has the following advantages that
1, provided by the present invention for the absorbing material of 77GHz millimetre-wave radar test, by the way that substrate is designed to eggshell
The papillary structure of shape, head-on reflection can be reduced in high frequency by realizing, and be more suitable for 77GHz high frequency；
2, provided by the present invention for the absorbing material of 77GHz millimetre-wave radar test, in roll-in by a pair of of substrate
Mastoid process structure make-up, by roll squeezer compregnate repeatedly, obtained mastoid process type absorbing material, more evenly because of each component compregnate, more
Suitable for high-frequency test；
3, provided by the present invention for the absorbing material of 77GHz millimetre-wave radar test, be volume is smaller, detection accuracy more
High, the longer 77GHz millimetre-wave radar of detection range provides accurate test environment；
4, provided by the present invention for the absorbing material of 77GHz millimetre-wave radar test, addition superconductor graphene is mentioned
High absorbent properties of the absorbing material in high frequency 77GHz；
5, provided by the present invention for the absorbing material of 77GHz millimetre-wave radar test, after high speed dispersion, sand milling
Feed liquid, partial size is less than 5 microns, and feed liquid is dispersed uniform, fine and smooth, and repeatedly after rod pressure, each ingredient is uniformly distributed in mastoid process structure,
More it is able to satisfy the demand of high-frequency test.
To sum up, it applies the technical scheme of the present invention and solves existing absorbing material in the prior art and be unable to satisfy 77GHz
The problem of testing requirement of millimeter wave.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to do simply to introduce, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without any creative labor, can be with
It obtains other drawings based on these drawings.
Fig. 1 is matrix structure schematic diagram of the present invention.
Fig. 2 is the 75 millimeters high mastoid process product vertical incidence drain performance curve graph of the present invention.
In figure: 1, substrate 2, mastoid process structure.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
It is only a part of the embodiment of the present invention, instead of all the embodiments.It is real to the description of at least one exemplary embodiment below
It is merely illustrative on border, never as to the present invention and its application or any restrictions used.Based on the reality in the present invention
Example is applied, every other embodiment obtained by those of ordinary skill in the art without making creative efforts all belongs to
In the scope of protection of the invention.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to exemplary embodiments of the present invention.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
Unless specifically stated otherwise, positioned opposite, the digital table of the component and step that otherwise illustrate in these embodiments
It is not limited the scope of the invention up to formula and numerical value.Simultaneously, it should be clear that for ease of description, each portion shown in attached drawing
The size divided not is to draw according to actual proportionate relationship.Technology known for person of ordinary skill in the relevant, side
Method and equipment may be not discussed in detail, but in the appropriate case, and the technology, method and apparatus should be considered as authorizing explanation
A part of book.In shown here and discussion all examples, any occurrence should be construed as merely illustratively, and
Not by way of limitation.Therefore, the other examples of exemplary embodiment can have different values.It should also be noted that similar label
Similar terms are indicated in following attached drawing with letter, therefore, once it is defined in a certain Xiang Yi attached drawing, then subsequent attached
It does not need that it is further discussed in figure.
In the description of the present invention, it is to be understood that, the noun of locality such as " front, rear, top, and bottom, left and right ", " it is laterally, vertical,
Vertically, orientation or positional relationship indicated by level " and " top, bottom " etc. is normally based on orientation or position shown in the drawings and closes
System, is merely for convenience of description of the present invention and simplification of the description, in the absence of explanation to the contrary, these nouns of locality do not indicate that
It must have a particular orientation or be constructed and operated in a specific orientation with the device or element for implying signified, therefore cannot manage
Solution is limiting the scope of the invention: the noun of locality " inside and outside " refers to inside and outside the profile relative to each component itself.
For ease of description, spatially relative term can be used herein, as " ... on ", " ... top ",
" ... upper surface ", " above " etc., for describing such as a device shown in the figure or feature and other devices or spy
The spatial relation of sign.It should be understood that spatially relative term is intended to comprising the orientation in addition to device described in figure
Except different direction in use or operation.For example, being described as if the device in attached drawing is squeezed " in other devices
It will be positioned as " under other devices or construction after part or construction top " or the device of " on other devices or construction "
Side " or " under its device or construction ".Thus, exemplary term " ... top " may include " ... top " and
" in ... lower section " two kinds of orientation.The device can also be positioned with other different modes and (is rotated by 90 ° or in other orientation), and
And respective explanations are made to the opposite description in space used herein above.
In addition, it should be noted that, limiting components using the words such as " first ", " second ", it is only for be convenient for
Corresponding components are distinguished, do not have Stated otherwise such as, there is no particular meanings for above-mentioned word, therefore should not be understood as to this
The limitation of invention protection scope.
As shown in Figure 1, passing through roll-in the present invention provides a kind of absorbing material for the test of 77GHz millimetre-wave radar
The mode of machine roll-in substrate forms after conductive feed liquid is immersed substrate；Substrate is made of percent opening of 90% polyurethane sponge,
It include: substrate 1 and mastoid process structure 2；Substrate 1 is that height is 20mm rectangular plate-like structure, and in one side, array is machined with several high
The mastoid process structure 2 that degree is 55；The line space and column pitch on 2 vertex of mastoid process structure are 35mm.
Roll squeezer is three-roller linkage structure, and upper parallel two roller is controlled by roller spacing in 1.5 millimeters of control feeding coals, sagging
Straight two roller is pressure of 5 millimeters of controls to substrate by control roller spacing.In roll-in, mastoid process structure is opposite buckles well, and uses roll squeezer
Tow sides roll-in repeatedly.
The conductive material formula of liquid of absorbing material for the test of 77GHz millimetre-wave radar includes:
Water: 45%；
Dispersing agent: 1.5%；
Defoaming agent: 0.2%；
Acetylene carbon black: 2%；
Graphene: 0.8%；
Aluminium hydroxide: 11%；
Ammonium polyphosphate: 3%；
Elastic polyurethane feed liquid: 36.5%.
The conductive material liquid and preparation method thereof of absorbing material for the test of 77GHz millimetre-wave radar are as follows:
A, it weighs: weighing out each component material as needed；
B, it stirs: sequentially adding dispersing agent, defoaming agent, acetylene carbon black, graphene, aluminium hydroxide and polyphosphoric acid in water
Ammonium is stirred 2 hours under conditions of 2500r/min with high speed disperser；
C, it grinds: feed liquid obtained in step B being ground 2 hours with sand mill again, obtains material of the partial size less than 5 microns
Liquid；
D, charging grinding: elastic polyurethane feed liquid is added in the feed liquid obtained in step C, is stirred under the conditions of 300r/min
It mixes 15 minutes, obtains dipping feed liquid.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (9)
1. a kind of absorbing material for the test of 77GHz millimetre-wave radar, which is characterized in that the absorbing material is to pass through roller
The mode of press roll-in substrate forms after conductive feed liquid is immersed substrate；
The substrate is made of open-cell polyurethane sponge, comprising: substrate (1) and mastoid process structure (2)；Substrate (1) is rectangular slab
Shape structure, in one side, array is machined with several mastoid process structures (2).
2. the absorbing material according to claim 1 for the test of 77GHz millimetre-wave radar, which is characterized in that described
The percent opening of substrate is 90%.
3. the absorbing material according to claim 1 or 2 for the test of 77GHz millimetre-wave radar, which is characterized in that described
Substrate (1) height be 15-25mm.
4. the absorbing material according to claim 1 or 2 for the test of 77GHz millimetre-wave radar, which is characterized in that described
Mastoid process structure (2) height be 55-65mm.
5. the absorbing material according to claim 1 or 2 for the test of 77GHz millimetre-wave radar, which is characterized in that described
Mastoid process structure (2) vertex line space and column pitch be 35mm.
6. the absorbing material according to claim 1 or 2 for the test of 77GHz millimetre-wave radar, which is characterized in that described
Conductive material formula of liquid include:
Water: 40-50%；
Dispersing agent: 1.3-1.7%；
Defoaming agent: 0.2-0.3%；
Acetylene carbon black: 1.5-2.5%；
Graphene: 0.2-1%；
Aluminium hydroxide: 8.5-9.5%；
Ammonium polyphosphate: 3-4%；
Elastic polyurethane feed liquid: 35.3-41%.
7. the absorbing material according to claim 1 or 2 for the test of 77GHz millimetre-wave radar, which is characterized in that described
Conductive material liquid and preparation method thereof, which is characterized in that it is described the preparation method comprises the following steps:
A, it weighs: weighing out each component material as needed；
B, it stirs: sequentially adding dispersing agent, defoaming agent, acetylene carbon black, graphene, aluminium hydroxide and ammonium polyphosphate in water, use
High speed disperser stirs 2 hours under conditions of 2500r/min；
C, it grinds: feed liquid obtained in step B being ground 2 hours with sand mill again, obtains feed liquid of the partial size less than 5 microns；
D, it feeds: elastic polyurethane feed liquid being added in the feed liquid obtained in step C, 15 points are stirred under the conditions of 300r/min
Clock obtains dipping feed liquid.
8. the absorbing material according to claim 1 or 2 for the test of 77GHz millimetre-wave radar, which is characterized in that described
Roll squeezer be three-roller linkage structure, upper parallel two roller by roller spacing control feeding coal, lower vertical two roller pass through the control of roller spacing
Make the pressure to substrate.
9. the absorbing material according to claim 1 or 2 for the test of 77GHz millimetre-wave radar, which is characterized in that described
Substrate in roll-in, mastoid process structure (2) is opposite buckles well, with the roll-in repeatedly of roll squeezer tow sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910780414.3A CN110483835B (en) | 2019-08-22 | 2019-08-22 | Wave-absorbing material for 77GHz millimeter wave radar test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910780414.3A CN110483835B (en) | 2019-08-22 | 2019-08-22 | Wave-absorbing material for 77GHz millimeter wave radar test |
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| CN110483835A true CN110483835A (en) | 2019-11-22 |
| CN110483835B CN110483835B (en) | 2022-06-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117050378A (en) * | 2023-10-13 | 2023-11-14 | 中汽研汽车检验中心（天津）有限公司 | Millimeter wave absorbing material for ADAS (advanced automatic analysis system) test and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6784419B1 (en) * | 1999-10-28 | 2004-08-31 | Kabushiki Kaisha Riken | Electromagnetic wave absorber |
| CN103347379A (en) * | 2013-07-10 | 2013-10-09 | 南京洛普电子工程研究所 | Fire-retardant type wide-frequency-band high-power compound wave-absorbing material and preparing method thereof |
| CN209226893U (en) * | 2018-12-18 | 2019-08-09 | 大连东信微波技术有限公司 | Structural foam, which is soaked, with continuous conduction gradient half inhales wave plate |
-
2019
- 2019-08-22 CN CN201910780414.3A patent/CN110483835B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6784419B1 (en) * | 1999-10-28 | 2004-08-31 | Kabushiki Kaisha Riken | Electromagnetic wave absorber |
| CN103347379A (en) * | 2013-07-10 | 2013-10-09 | 南京洛普电子工程研究所 | Fire-retardant type wide-frequency-band high-power compound wave-absorbing material and preparing method thereof |
| CN209226893U (en) * | 2018-12-18 | 2019-08-09 | 大连东信微波技术有限公司 | Structural foam, which is soaked, with continuous conduction gradient half inhales wave plate |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117050378A (en) * | 2023-10-13 | 2023-11-14 | 中汽研汽车检验中心（天津）有限公司 | Millimeter wave absorbing material for ADAS (advanced automatic analysis system) test and preparation method thereof |
| CN117050378B (en) * | 2023-10-13 | 2024-02-13 | 中汽研汽车检验中心（天津）有限公司 | Millimeter wave absorbing material for ADAS (advanced automatic analysis system) test and preparation method thereof |
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| CN110483835B (en) | 2022-06-21 |
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