CN108503869A - The preparation method of low-frequency electromagnetic wave absorbing material - Google Patents
The preparation method of low-frequency electromagnetic wave absorbing material Download PDFInfo
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Abstract
The preparation method of low-frequency electromagnetic wave absorbing material, it is related to a kind of preparation method of electromagnetic wave absorbent material.The present invention be to solve existing space narrow electronic equipment low-frequency range electromagnetic radiation the technical issues of.This method：One, black suspension is prepared；Two, CNTs dispersion liquids are prepared；Three, CoFe is prepared2O4/ CNTs loads powder；Four, radio-radar absorber dispersion is prepared；Five, polyurethane modified epoxy resin binder is prepared；Six, low-frequency electromagnetic wave absorbing material is prepared.It is 1.18GHz~1.56GHz that absorbing material prepared by the present invention, which carries out electro-magnetic wave absorption test maximum absorption band, and absorption value is 30dB~14dB, effectively inhales intensity of wave 12dB, and absorption band width is 0.2GHz~0.66GHz.Using 9,286 1998 GB/T according to national standards《The cross cut test of paint and varnish paint film》It is measured, attachment grade is 1 grade.Antiradar coatings of the present invention, solve the electromagnetic radiation in small space, and product is widely used in the anti-field of mobile phone, the electromagnetic protection of household electrical appliance and human body electromagnetic wave.
Description
Technical field
The present invention relates to a kind of preparation methods of electromagnetic wave absorbent material.
Background technology
Electromagnetic wave absorption material is electromagnetic wave energy to be transformed into thermal energy by spillage of material, and the material absorbed
Material, research start from during the Second World War.Hereafter western developed country is to realize military leading ground purpose, and also successively input huge fund is being inhaled
Wave material is extensively studied in field.With the rapid development of telecommunications industry, the application of absorbing material has breached military affairs
Stealthy scope is deep into the numerous areas such as anti-interference communication, ELECTRONIC INFORMATION SECURITY, environmental protection and physical protection.With modern science
The continuous development of technology, the electronic equipments such as electronic instrument, household electrical appliance are constantly sent out to highly integrated, lightweight and miniaturization
Exhibition, is integrated with a large amount of electronic device, this is just inevitably generated electromagenetic wave radiation in narrow space.Electromagenetic wave radiation
Generated environmental pollution has become new social effects of pollution.Influence of the electromagnetic radiation to living environment and working environment is very big,
Electromagnetic environmental pollution causes many harmful effects, has become an important finger of environmental protection to the improvement of electromagnetic radiation environment pollution
Mark.
The fifties, American scientist just had found that electromagnetic radiation is led cataractogenic incidence and improved, 70-80 age science
Family find that electromagnetic radiation is to induce leukaemia and one of an important factor for cancer.Therefore, the protection of electromagenetic wave radiation is got over
More obtain the attention of national governments, and be resolved as an important index in environmental protection.
Electromagnetic field transmits energy outward in the form of an electromagnetic wave, only uses electromagnetic absorber, electromagnetic wave is made to be converted into
The energy of thermal energy and other forms could effectively remove Contamination of Electromagnetic Wave.Therefore the research of the absorbing material of electromagnetic pollution is solved
Just become the hot spot of people's research at this stage with application.
Absorbing material is widely used in terms of stealth technology, heat preservation energy-saving and human body electromagnetic protection.But mostly
Be 2~20GHz frequency ranges electromagenetic wave radiation absorb, for 0.8~1.8GHz low-frequency range electromagnetic radiation the current China of absorption also
Not too many is related to.With the continuous improvement of quality of life, household electrical appliance and electronics that people use and possess
Quantity be on the increase, the electromagnetism amplitude being harmful to human health caused by these household electrical appliance and electronics in this way
It penetrates with electromagnetic environmental pollution situation with regard to more acute.Meanwhile electronic equipment, household electrical appliance and the telecommunications that we are possessed are set
The electromagnetic wave of its own standby generation is not long-wave electromagnetic waves, but has the low of bigger damage capability to human body and normal communication
Frequency electromagnetic waves radiate.And with the development of science and technology, electronic equipment constantly develops to miniaturization, lightweight direction, equipment is certainly
Body internal structure becomes increasingly complex, and space is more and more narrower, and this requires its antiradar coatings while reducing coating layer thickness, carries
For more powerful absorbing property.
Invention content
The technical issues of the purpose of the present invention is to solve existing space narrow electronic equipment low-frequency range electromagnetic radiation,
Provide a kind of preparation method of low-frequency electromagnetic wave absorbing material.
The preparation method of low-frequency electromagnetic wave absorbing material follows the steps below：
One, according to Fe3+With Co2+Molar ratio is 3:2 ratio is by the Fe of a concentration of 0.5mol/L3+Aqueous solution and a concentration of
The Co of 0.5mol/L2+Aqueous solution mixes, and obtains mixed liquor, then by 80 DEG C of 25ml mixed liquors instillation, the 50mL of a concentration of 10mol/L
It is uniformly mixed in NaOH solution, 10ml Tween 80s is added, constant temperature persistently stirs 45 minutes, obtains black suspension；
Two, 0.2g~1g CNTs are added in 20ml distilled water, stir and be warming up to 400 revs/min of mixing speed
80 DEG C, 1g neopelexes are added, CNTs deployment conditions are observed after being completely dispersed dissolving, when CNTs uniformly has levels ground
It is dispersed in distilled water, and grain size becomes smaller, adds 0.5g Tween 80s, persistently stir 30min, obtain CNTs dispersion liquids；
Three, black suspension is added in CNTs dispersion liquids, obtains CoFe2O4With the mixed liquor of CNTs, by CoFe2O4
It is transferred in hydrothermal reaction kettle with the mixed liquor of CNTs, keeps the temperature 4 hours in 200 DEG C of insulating boxs, reaction kettle is cooled to room temperature, so
Decompression suction filtration is carried out to powder afterwards, and is washed 3 times with distilled water and methanol respectively, in 50 DEG C of freeze-day with constant temperature 12 hours, is obtained
CoFe2O4/ CNTs loads powder；
Four, it is 1 by 1g mass ratioes:1~2 CoFe2O4/ CNTs loads powder and Zn0.4Mn0.6Fe2O4Powder is put into beaker
In, it is dissolved with the cyclohexane solvent of 50ml, is heated to 50 DEG C and is stirred 30 minutes with 400 revs/min of mixing speed；Beaker is placed on
40 minutes on strong magnet, the powder not dissolved is made to settle down；Upper solution is poured into another beaker, and is put into 0.1g's
Tween 80 surfactant is heated to 50 DEG C and is stirred 30 minutes with 400 revs/min of speed, settled 40 minutes on strong magnet, will
Supernatant liquid is poured into another beaker, and 1g carbon nanotubes are added and are sufficiently stirred, obtain electro-magnetic wave absorption agent dispersing liquid；
Five, equipped with stirring, thermometer, condenser pipe four-hole bottle in, 10g toluene di-isocyanate(TDI)s and 10g polyethers is added
Dihydric alcohol is gradually heating to 80 DEG C, is reacted 1~1.5 hour at a temperature of being maintained at 80 DEG C, and cooling is down to 70~75 DEG C in temperature
When, 5g chain extender 1,4-butanediol is added, in 70 DEG C of isothermal reactions 1 hour, 1g hydrophilic chain extenders dihydromethyl propionic acid, 5g is added
Epoxy resin and 1g internal crosslinker N-Methyl pyrrolidones, and 0.1g catalyst dibutyl tin dilaurates, isothermal reaction 3 is added
~4 hours, obtain polyurethane modified epoxy resin binder；
Six, 1g electro-magnetic wave absorption agent dispersing liquids are distributed in 10g polyurethane modified epoxy resin binders, in 60 DEG C of perseverances
Temperature stirring 4~6 hours, when being cooled to 40 DEG C, low whipping speed be 15000 revs/min under the conditions of rapidly join 5g triethylamines and
The mixture of 10ml deionized waters is added 2.5g ethylenediamines and carries out chain extension, continues to stir 5 points with 15000 revs/min of mixing speed
Clock obtains low-frequency electromagnetic wave absorbing material.
The present invention has developed the novel low-frequency section antiradar coatings that a kind of thickness is thin, absorbent properties are strong, to solve in narrow sky
Between electromagnetic radiation, product is widely used in mobile phone, the electromagnetic protection of household electrical appliance and the fields such as human body electromagnetic wave is anti-.
The present invention is using nanometer ferro-cobalt magnetic powder and MnZn iron nano-magnetic powder as main absorber, while using certain
Nano carbon fiber, rare-earth metal material of ratio etc. are used as auxiliary absorbent.Using novolac epoxy resin as binder, and root
It is modified using polyurethane according to actual requirement.It is using surfactant that absorbent is uniform and stable by chemical homogenizing method
Ground, which is distributed to, obtains final product in binder.It is acted on using the electron channel of carbon nanotube, makes absorbing material compound system
Electro-magnetic wave absorption frequency range it is whole migrated to low-frequency range, to enhance the assimilation effect to low-frequency range electromagnetic wave, make it have
More better than single electromagnetic absorption agent low frequency electromagnetic absorbing property and broader low frequency absorb bandwidth.
The present invention provides a kind of new coating for having and carrying out effective electromagnetic wave absorption in small space.Its main feature is that sharp
With Nanometer Cobalt Ferrite Oxide and the good electromagnetic wave absorption performance of Mn ferrite, converts electromagnetic wave to thermal energy and carry out reaching reduction electricity
The effect of magnetic radiation.Make the electro-magnetic wave absorption frequency range of absorbing material compound system using the effect of the electron channel of carbon nanotube simultaneously
It is whole to be migrated to low-frequency range, to enhance the assimilation effect to low-frequency range electromagnetic wave.
The method of the present invention can make nano Co Fe2O4With Zn0.4Mn0.6Fe2O4It is uniformly and stably dispersed in through hydroxyl asphalt mixtures modified by epoxy resin
In the compound binding agent of the polyurethane-modified chain extension of fat sealing end, it is not susceptible to reunite and settles, increase antiradar coatings system
Service life；By the way that carbon nanotube is added, is acted on using the electron channel of carbon nanotube, make the electromagnetism of absorbing material compound system
Wave absorbs frequency range entirety and is migrated to low-frequency range, to enhance the assimilation effect to low-frequency range electromagnetic wave, makes it have than list
The better low frequency electromagnetic absorbing property of one electromagnetic absorption agent and broader low frequency absorb bandwidth.The invention preparation process is simple, easy
In realization industrialization.
Low-frequency electromagnetic wave absorbing material prepared by the present invention is sprayed on resin plate and carries out electro-magnetic wave absorption test maximum
Absorption peak appears in 1.18GHz~1.56GHz, and absorption value is -30dB~-14dB, effectively inhales intensity of wave -12dB, absorption band
Width is 0.2GHz~0.66GHz.
Adhere to grade：Using GB/T 9286-1998 according to national standards《The cross cut test of paint and varnish paint film》It carries out
It measures, attachment grade is 1 grade.
Description of the drawings
Fig. 1 is nano Co Fe2O4TEM figure；
Fig. 2 is the TEM figures of carbon nanotube；
Fig. 3 is gained CoFe in one step 3 of experiment2O4/ CNTs loads the TEM figures of powder；
Fig. 4 is gained CoFe in one step 3 of experiment2O4/ CNTs loads powder, nano Co Fe2O4And the XRD of carbon nanotube
Comparison diagram, a indicates nano Co Fe in figure2O4, b expression carbon nanotubes, c expressions CoFe2O4/ carbon nanotube；
Fig. 5 is gained CoFe in one step 3 of experiment2O4/ CNTs loads powder, nano Co Fe2O4And carbon nanotube is red
Outer spectrogram comparison diagram, a indicates nano Co Fe in figure2O4, b expression carbon nanotubes, c expressions CoFe2O4/ carbon nanotube；
Fig. 6 is gained CoFe in one step 3 of experiment2O4/ CNTs loads the thermogravimetric curve of powder；
Fig. 7 is gained CoFe in one step 3 of experiment2O4/ CNTs loads powder, nano Co Fe2O4And carbon nanotube is micro-
Wave absorption curve, a indicates nano Co Fe in figure2O4, b expression carbon nanotubes, c expressions CoFe2O4/ carbon nanotube；
Fig. 8 is the photo for testing gained low-frequency electromagnetic wave absorbing material print in one；
Fig. 9 is the absorption curve for testing gained low-frequency electromagnetic wave absorbing material in one；
Figure 10 is the photo for testing gained low-frequency electromagnetic wave absorbing material print in two；
Figure 11 is the absorption curve for testing gained low-frequency electromagnetic wave absorbing material in two；
Figure 12 is the photo for testing gained low-frequency electromagnetic wave absorbing material print in three；
Figure 13 is the absorption curve for testing gained low-frequency electromagnetic wave absorbing material in three；
Figure 14 is the photo for testing gained low-frequency electromagnetic wave absorbing material print in four；
Figure 15 is the absorption curve for testing gained low-frequency electromagnetic wave absorbing material in four；
Figure 16 is the photo of gained low-frequency electromagnetic wave absorbing material print in experiment five；
Figure 17 is the absorption curve of gained low-frequency electromagnetic wave absorbing material in experiment five；
Figure 18 is the photo for testing gained low-frequency electromagnetic wave absorbing material print in six；
Figure 19 is the absorption curve for testing gained low-frequency electromagnetic wave absorbing material in six.
Specific implementation mode
Technical solution of the present invention is not limited to act specific implementation mode set forth below, further includes between each specific implementation mode
Arbitrary combination.
Specific implementation mode one：In present embodiment the preparation method of low-frequency electromagnetic wave absorbing material according to the following steps into
Row：
One, according to Fe3+With Co2+Molar ratio is 3:2 ratio is by the Fe of a concentration of 0.5mol/L3+Aqueous solution and a concentration of
The Co of 0.5mol/L2+Aqueous solution mixes, and obtains mixed liquor, then by 80 DEG C of 25ml mixed liquors instillation, the 50mL of a concentration of 10mol/L
It is uniformly mixed in NaOH solution, 10ml Tween 80s is added, constant temperature persistently stirs 45 minutes, obtains black suspension；
Two, 0.2g~1g CNTs are added in 20ml distilled water, stir and be warming up to 400 revs/min of mixing speed
80 DEG C, 1g neopelexes are added, CNTs deployment conditions are observed after being completely dispersed dissolving, when CNTs uniformly has levels ground
It is dispersed in distilled water, and grain size becomes smaller, adds 0.5g Tween 80s, persistently stir 30min, obtain CNTs dispersion liquids；
Three, black suspension is added in CNTs dispersion liquids, obtains CoFe2O4With the mixed liquor of CNTs, by CoFe2O4
It is transferred in hydrothermal reaction kettle with the mixed liquor of CNTs, keeps the temperature 4 hours in 200 DEG C of insulating boxs, reaction kettle is cooled to room temperature, so
Decompression suction filtration is carried out to powder afterwards, and is washed 3 times with distilled water and methanol respectively, in 50 DEG C of freeze-day with constant temperature 12 hours, is obtained
CoFe2O4/ CNTs loads powder；
Four, it is 1 by 1g mass ratioes:1~2 CoFe2O4/ CNTs loads powder and Zn0.4Mn0.6Fe2O4Powder is put into beaker
In, it is dissolved with the cyclohexane solvent of 50ml, is heated to 50 DEG C and is stirred 30 minutes with 400 revs/min of mixing speed；Beaker is placed on
40 minutes on strong magnet, the powder not dissolved is made to settle down；Upper solution is poured into another beaker, and is put into 0.1g's
Tween 80 surfactant is heated to 50 DEG C and is stirred 30 minutes with 400 revs/min of speed, settled 40 minutes on strong magnet, will
Supernatant liquid is poured into another beaker, and 1g carbon nanotubes are added and are sufficiently stirred, obtain electro-magnetic wave absorption agent dispersing liquid；
Five, equipped with stirring, thermometer, condenser pipe four-hole bottle in, 10g toluene di-isocyanate(TDI)s (TDI) and 10g are added
Polyether Glycols are gradually heating to 80 DEG C, are reacted 1~1.5 hour at a temperature of being maintained at 80 DEG C, cooling, 70 are down in temperature~
At 75 DEG C, 5g chain extenders 1,4-butanediol (BDO) is added, in 70 DEG C of isothermal reactions 1 hour, 1g hydrophilic chain extender dihydroxy first is added
Base propionic acid (DMPA), 5g epoxy resin (EP) and 1g internal crosslinkers N-Methyl pyrrolidone (NMP), and 0.1g catalyst two is added
Butyl tin dilaurate tin, isothermal reaction 3-4 hours, obtains polyurethane modified epoxy resin binder；
Six, 1g electro-magnetic wave absorption agent dispersing liquids are distributed in 10g polyurethane modified epoxy resin binders, in 60 DEG C of perseverances
Temperature stirring 4~6 hours, when being cooled to 40 DEG C, low whipping speed rapidly joins 5g triethylamines (TEA) under the conditions of being 15000 revs/min
With the mixture of 10ml deionized waters, 2.5g ethylenediamines (EDA) are added and carry out chain extension, continue with 15000 revs/min of mixing speed
Stirring 5 minutes, obtains low-frequency electromagnetic wave absorbing material.
Specific implementation mode two：The present embodiment is different from the first embodiment in that being maintained at 80 DEG C of temperature in step 5
Degree lower reaction 1.1-1.3 hours.It is other same as the specific embodiment one.
Specific implementation mode three：The present embodiment is different from the first and the second embodiment in that being dropped in temperature in step 5
When to 71 DEG C, 5g chain extender 1,4-butanediol is added.It is other the same as one or two specific embodiments.
Specific implementation mode four：In step 5 unlike one of present embodiment and specific implementation mode one to three
When temperature is down to 72 DEG C, 5g chain extender 1,4-butanediol is added.It is other identical as one of specific implementation mode one to three.
Specific implementation mode five：In step 5 unlike one of present embodiment and specific implementation mode one to four
When temperature is down to 73 DEG C, 5g chain extender 1,4-butanediol is added.It is other identical as one of specific implementation mode one to four.
Specific implementation mode six：In step 5 unlike one of present embodiment and specific implementation mode one to five
When temperature is down to 74 DEG C, 5g chain extender 1,4-butanediol is added.It is other identical as one of specific implementation mode one to five.
Specific implementation mode seven：In step 5 unlike one of present embodiment and specific implementation mode one to six
And 0.1g catalyst dibutyl tin dilaurates are added, isothermal reaction 3.5 hours.One of other and specific implementation mode one to six
It is identical.
Specific implementation mode eight：In step 6 unlike one of present embodiment and specific implementation mode one to seven
1g electro-magnetic wave absorption agent dispersing liquids are distributed in 10g polyurethane modified epoxy resin binders, it is small in 60 DEG C of constant temperature stirrings 4.2
When.It is other identical as one of specific implementation mode one to seven.
Specific implementation mode nine：In step 6 unlike one of present embodiment and specific implementation mode one to eight
1g electro-magnetic wave absorption agent dispersing liquids are distributed in 10g polyurethane modified epoxy resin binders, it is small in 60 DEG C of constant temperature stirrings 4.5
When.It is other identical as one of specific implementation mode one to eight.
Specific implementation mode ten：In step 6 unlike one of present embodiment and specific implementation mode one to nine
1g electro-magnetic wave absorption agent dispersing liquids are distributed in 10g polyurethane modified epoxy resin binders, it is small in 60 DEG C of constant temperature stirrings 5
When.It is other identical as one of specific implementation mode one to nine.
Using following experimental verifications effect of the present invention：
Experiment one：
The preparation method of low-frequency electromagnetic wave absorbing material follows the steps below：
One, according to Fe3+With Co2+Molar ratio is 3:2 ratio is by the Fe of a concentration of 0.5mol/L3+Aqueous solution and a concentration of
The Co of 0.5mol/L2+Aqueous solution mixes, and obtains mixed liquor, then by 80 DEG C of 25ml mixed liquors instillation, the 50mL of a concentration of 10mol/L
It is uniformly mixed in NaOH solution, 10ml Tween 80s is added, constant temperature persistently stirs 45 minutes, obtains black suspension；
Two, 0.2g CNTs are added in 20ml distilled water, are stirred with 400 revs/min of mixing speed and are warming up to 80
DEG C, 1g neopelexes are added, CNTs deployment conditions are observed after being completely dispersed dissolving, when CNTs divides with uniformly having levels
It is dispersed in distilled water, and grain size becomes smaller, adds 0.5g Tween 80s, persistently stir 30min, obtain CNTs dispersion liquids；
Three, black suspension is added in CNTs dispersion liquids, obtains CoFe2O4With the mixed liquor of CNTs, by CoFe2O4
It is transferred in hydrothermal reaction kettle with the mixed liquor of CNTs, keeps the temperature 4 hours in 200 DEG C of insulating boxs, reaction kettle is cooled to room temperature, so
Decompression suction filtration is carried out to powder afterwards, and is washed 3 times with distilled water and methanol respectively, in 50 DEG C of freeze-day with constant temperature 12 hours, is obtained
CoFe2O4/ CNTs loads powder；
Four, it is 1 by 1g mass ratioes:1 CoFe2O4/ CNTs loads powder and Zn0.4Mn0.6Fe2O4Powder is put into beaker, is used
The cyclohexane solvent of 50ml dissolves, and is heated to 50 DEG C and is stirred 30 minutes with 400 revs/min of mixing speed；Beaker is placed on strong magnetic
40 minutes on iron, the powder not dissolved is made to settle down；Upper solution is poured into another beaker, and is put into the tween of 0.1g
80 surfactants are heated to 50 DEG C and are stirred 30 minutes with 400 revs/min of speed, settled 40 minutes on strong magnet, by upper layer
In liquid pouring to another beaker, 1g carbon nanotubes are added and are sufficiently stirred, obtain electro-magnetic wave absorption agent dispersing liquid；
Five, equipped with stirring, thermometer, condenser pipe four-hole bottle in, 10g toluene di-isocyanate(TDI)s (TDI) and 10g are added
Polyether Glycols are gradually heating to 80 DEG C, are reacted 1.4 hours at a temperature of being maintained at 80 DEG C, cooling, when temperature is down to 74 DEG C,
5g chain extenders 1,4-butanediol (BDO) is added, in 70 DEG C of isothermal reactions 1 hour, 1g hydrophilic chain extender dihydromethyl propionic acids are added
(DMPA), 5g epoxy resin (EP) and 1g internal crosslinkers N-Methyl pyrrolidone (NMP), and 0.1g catalyst dibutyl two is added
Tin laurate, isothermal reaction 3-4 hours, obtains polyurethane modified epoxy resin binder；
Six, 1g electro-magnetic wave absorption agent dispersing liquids are distributed in 10g polyurethane modified epoxy resin binders, in 60 DEG C of perseverances
Temperature stirring 4 hours, when being cooled to 40 DEG C, low whipping speed be 15000 revs/min under the conditions of rapidly join 5g triethylamines (TEA) and
The mixture of 10ml deionized waters is added 2.5g ethylenediamines (EDA) and carries out chain extension, and continuation is stirred with 15000 revs/min of mixing speed
It mixes 5 minutes, obtains low-frequency electromagnetic wave absorbing material.
Gained low-frequency electromagnetic wave absorbing material is sprayed using spray gun in 10cm × 10cmABS resin board surfaces, is sprayed
It is smooth to be applied to surface, 50 DEG C of baking oven isothermal curing 12 hours forms the film of 1.5mm thickness.Electro-magnetic wave absorption is carried out to model
Test, the results are shown in Figure 8.
Maximum absorption band appears in 1.24GHz as can be seen from Figure 9, and absorption value is -27dB, effectively inhales intensity of wave -12dB
Absorption band width is 0.66GHz.
Adhere to grade：Using GB/T 9286-1998 according to national standards《The cross cut test of paint and varnish paint film》It carries out
It measures, attachment grade is 1 grade.
Experiment two：
The preparation method of low-frequency electromagnetic wave absorbing material follows the steps below：
One, according to Fe3+With Co2+Molar ratio is 3:2 ratio is by the Fe of a concentration of 0.5mol/L3+Aqueous solution and a concentration of
The Co of 0.5mol/L2+Aqueous solution mixes, and obtains mixed liquor, then by 80 DEG C of 25ml mixed liquors instillation, the 50mL of a concentration of 10mol/L
It is uniformly mixed in NaOH solution, 10ml Tween 80s is added, constant temperature persistently stirs 45 minutes, obtains black suspension；
Two, 1g CNTs are added in 20ml distilled water, are stirred with 400 revs/min of mixing speed and are warming up to 80 DEG C,
1g neopelexes are added, CNTs deployment conditions are observed after being completely dispersed dissolving, when CNTs disperses with uniformly having levels
In distilled water, and grain size becomes smaller, and adds 0.5g Tween 80s, persistently stirs 30min, obtains CNTs dispersion liquids；
Three, black suspension is added in CNTs dispersion liquids, obtains CoFe2O4With the mixed liquor of CNTs, by CoFe2O4
It is transferred in hydrothermal reaction kettle with the mixed liquor of CNTs, keeps the temperature 4 hours in 200 DEG C of insulating boxs, reaction kettle is cooled to room temperature, so
Decompression suction filtration is carried out to powder afterwards, and is washed 3 times with distilled water and methanol respectively, in 50 DEG C of freeze-day with constant temperature 12 hours, is obtained
CoFe2O4/ CNTs loads powder；
Four, it is 1 by 1g mass ratioes:1.5 CoFe2O4/ CNTs loads powder and Zn0.4Mn0.6Fe2O4Powder is put into beaker,
It is dissolved with the cyclohexane solvent of 50ml, is heated to 50 DEG C and is stirred 30 minutes with 400 revs/min of mixing speed；Beaker is placed on by force
40 minutes on magnet, the powder not dissolved is made to settle down；Upper solution is poured into another beaker, and is put into spitting for 0.1g
Warm 80 surfactants are heated to 50 DEG C and are stirred 30 minutes with 400 revs/min of speed, settled 40 minutes on strong magnet, will be upper
In layer liquid pouring to another beaker, 1g carbon nanotubes are added and are sufficiently stirred, obtain electro-magnetic wave absorption agent dispersing liquid；
Five, equipped with stirring, thermometer, condenser pipe four-hole bottle in, 10g toluene di-isocyanate(TDI)s and 10g polyethers is added
Dihydric alcohol is gradually heating to 80 DEG C, is reacted 1 hour at a temperature of being maintained at 80 DEG C, cooling, and when temperature is down to 71 DEG C, 5g is added
1g hydrophilic chain extenders dihydromethyl propionic acid, 5g epoxy resin was added in 70 DEG C of isothermal reactions 1 hour in chain extender 1,4-butanediol
With 1g internal crosslinker N-Methyl pyrrolidones, and 0.1g catalyst dibutyl tin dilaurates are added, isothermal reaction 3 hours obtains
To polyurethane modified epoxy resin binder；
Six, 1g electro-magnetic wave absorption agent dispersing liquids are distributed in 10g polyurethane modified epoxy resin binders, in 60 DEG C of perseverances
Temperature stirring 4 hours, when being cooled to 40 DEG C, low whipping speed rapidly joins 5g triethylamines under the conditions of being 15000 revs/min and 10ml is gone
The mixture of ionized water is added 2.5g ethylenediamines and carries out chain extension, continues to stir 5 minutes with 15000 revs/min of mixing speed, obtain
To low-frequency electromagnetic wave absorbing material.
Gained low-frequency electromagnetic wave absorbing material is sprayed using spray gun in 10cm × 10cmABS resin board surfaces, is sprayed
It is smooth to be applied to surface, 50 DEG C of baking oven isothermal curing 12 hours forms the film of 1.5mm thickness.Electro-magnetic wave absorption is carried out to model
It tests, as a result such as Figure 10, as can be seen from Figure 11 maximum absorption band appears in 1.2GHz, and absorption value is -18dB, effectively inhales intensity of wave -
12dB absorption band width is 0.3GHz.
Adhere to grade：Using GB/T 9286-1998 according to national standards《The cross cut test of paint and varnish paint film》It carries out
It measures, attachment grade is 1 grade.
Experiment three：
The preparation method of low-frequency electromagnetic wave absorbing material follows the steps below：
One, according to Fe3+With Co2+Molar ratio is 3:2 ratio is by the Fe of a concentration of 0.5mol/L3+Aqueous solution and a concentration of
The Co of 0.5mol/L2+Aqueous solution mixes, and obtains mixed liquor, then by 80 DEG C of 25ml mixed liquors instillation, the 50mL of a concentration of 10mol/L
It is uniformly mixed in NaOH solution, 10ml Tween 80s is added, constant temperature persistently stirs 45 minutes, obtains black suspension；
Two, 1g CNTs are added in 20ml distilled water, are stirred with 400 revs/min of mixing speed and are warming up to 80 DEG C,
1g neopelexes are added, CNTs deployment conditions are observed after being completely dispersed dissolving, when CNTs disperses with uniformly having levels
In distilled water, and grain size becomes smaller, and adds 0.5g Tween 80s, persistently stirs 30min, obtains CNTs dispersion liquids；
Three, black suspension is added in CNTs dispersion liquids, obtains CoFe2O4With the mixed liquor of CNTs, by CoFe2O4
It is transferred in hydrothermal reaction kettle with the mixed liquor of CNTs, keeps the temperature 4 hours in 200 DEG C of insulating boxs, reaction kettle is cooled to room temperature, so
Decompression suction filtration is carried out to powder afterwards, and is washed 3 times with distilled water and methanol respectively, in 50 DEG C of freeze-day with constant temperature 12 hours, is obtained
CoFe2O4/ CNTs loads powder；
Four, it is 1 by 1g mass ratioes:2 CoFe2O4/ CNTs loads powder and Zn0.4Mn0.6Fe2O4Powder is put into beaker, is used
The cyclohexane solvent of 50ml dissolves, and is heated to 50 DEG C and is stirred 30 minutes with 400 revs/min of mixing speed；Beaker is placed on strong magnetic
40 minutes on iron, the powder not dissolved is made to settle down；Upper solution is poured into another beaker, and is put into the tween of 0.1g
80 surfactants are heated to 50 DEG C and are stirred 30 minutes with 400 revs/min of speed, settled 40 minutes on strong magnet, by upper layer
In liquid pouring to another beaker, 1g carbon nanotubes are added and are sufficiently stirred, obtain electro-magnetic wave absorption agent dispersing liquid；
Five, equipped with stirring, thermometer, condenser pipe four-hole bottle in, 10g toluene di-isocyanate(TDI)s and 10g polyethers is added
Dihydric alcohol is gradually heating to 80 DEG C, is reacted 1 hour at a temperature of being maintained at 80 DEG C, cooling, and when temperature is down to 71 DEG C, 5g is added
1g hydrophilic chain extenders dihydromethyl propionic acid, 5g epoxy resin was added in 70 DEG C of isothermal reactions 1 hour in chain extender 1,4-butanediol
With 1g internal crosslinker N-Methyl pyrrolidones, and 0.1g catalyst dibutyl tin dilaurates are added, isothermal reaction 3 hours obtains
To polyurethane modified epoxy resin binder；
Six, 1g electro-magnetic wave absorption agent dispersing liquids are distributed in 10g polyurethane modified epoxy resin binders, in 60 DEG C of perseverances
Temperature stirring 4 hours, when being cooled to 40 DEG C, low whipping speed rapidly joins 5g triethylamines under the conditions of being 15000 revs/min and 10ml is gone
The mixture of ionized water is added 2.5g ethylenediamines and carries out chain extension, continues to stir 5 minutes with 15000 revs/min of mixing speed, obtain
To low-frequency electromagnetic wave absorbing material.
Gained low-frequency electromagnetic wave absorbing material is sprayed using spray gun in 10cm × 10cmABS resin board surfaces, is sprayed
It is smooth to be applied to surface, 50 DEG C of baking oven isothermal curing 12 hours forms the film of 1.5mm thickness.Electro-magnetic wave absorption is carried out to model
It tests, as a result such as Figure 12, as can be seen from Figure 13 maximum absorption band appears in 1.18GHz, and absorption value is -16.6dB, and it is strong effectively to inhale wave
Degree -12dB absorption band width is 0.26GHz.
Adhere to grade：Using GB/T 9286-1998 according to national standards《The cross cut test of paint and varnish paint film》It carries out
It measures, attachment grade is 1 grade.
Experiment four：
The preparation method of low-frequency electromagnetic wave absorbing material follows the steps below：
One, according to Fe3+With Co2+Molar ratio is 3:2 ratio is by the Fe of a concentration of 0.5mol/L3+Aqueous solution and a concentration of
The Co of 0.5mol/L2+Aqueous solution mixes, and obtains mixed liquor, then by 80 DEG C of 25ml mixed liquors instillation, the 50mL of a concentration of 10mol/L
It is uniformly mixed in NaOH solution, 10ml Tween 80s is added, constant temperature persistently stirs 45 minutes, obtains black suspension；
Two, 0.5g CNTs are added in 20ml distilled water, are stirred with 400 revs/min of mixing speed and are warming up to 80
DEG C, 1g neopelexes are added, CNTs deployment conditions are observed after being completely dispersed dissolving, when CNTs divides with uniformly having levels
It is dispersed in distilled water, and grain size becomes smaller, adds 0.5g Tween 80s, persistently stir 30min, obtain CNTs dispersion liquids；
Three, black suspension is added in CNTs dispersion liquids, obtains CoFe2O4With the mixed liquor of CNTs, by CoFe2O4
It is transferred in hydrothermal reaction kettle with the mixed liquor of CNTs, keeps the temperature 4 hours in 200 DEG C of insulating boxs, reaction kettle is cooled to room temperature, so
Decompression suction filtration is carried out to powder afterwards, and is washed 3 times with distilled water and methanol respectively, in 50 DEG C of freeze-day with constant temperature 12 hours, is obtained
CoFe2O4/ CNTs loads powder；
Four, it is 1 by 1g mass ratioes:1 CoFe2O4/ CNTs loads powder and Zn0.4Mn0.6Fe2O4Powder is put into beaker, is used
The cyclohexane solvent of 50ml dissolves, and is heated to 50 DEG C and is stirred 30 minutes with 400 revs/min of mixing speed；Beaker is placed on strong magnetic
40 minutes on iron, the powder not dissolved is made to settle down；Upper solution is poured into another beaker, and is put into the tween of 0.1g
80 surfactants are heated to 50 DEG C and are stirred 30 minutes with 400 revs/min of speed, settled 40 minutes on strong magnet, by upper layer
In liquid pouring to another beaker, 1g carbon nanotubes are added and are sufficiently stirred, obtain electro-magnetic wave absorption agent dispersing liquid；
Five, equipped with stirring, thermometer, condenser pipe four-hole bottle in, 10g toluene di-isocyanate(TDI)s and 10g polyethers is added
Dihydric alcohol is gradually heating to 80 DEG C, is reacted 1.2 hours at a temperature of being maintained at 80 DEG C, cooling, when temperature is down to 72 DEG C, is added
1g hydrophilic chain extenders dihydromethyl propionic acid, 5g asphalt mixtures modified by epoxy resin was added in 70 DEG C of isothermal reactions 1 hour in 5g chain extender 1,4-butanediol
Fat and 1g internal crosslinker N-Methyl pyrrolidones, and 0.1g catalyst dibutyl tin dilaurates are added, isothermal reaction 3.5 is small
When, obtain polyurethane modified epoxy resin binder；
Six, 1g electro-magnetic wave absorption agent dispersing liquids are distributed in 10g polyurethane modified epoxy resin binders, in 60 DEG C of perseverances
Temperature stirring 4.5 hours, when being cooled to 40 DEG C, low whipping speed rapidly joins 5g triethylamines and 10ml under the conditions of being 15000 revs/min
The mixture of deionized water is added 2.5g ethylenediamines and carries out chain extension, continues to stir 5 minutes with 15000 revs/min of mixing speed,
Obtain low-frequency electromagnetic wave absorbing material.
Gained low-frequency electromagnetic wave absorbing material is sprayed using spray gun in 10cm × 10cmABS resin board surfaces, is sprayed
It is smooth to be applied to surface, 50 DEG C of baking oven isothermal curing 12 hours forms the film of 1.5mm thickness.Electro-magnetic wave absorption is carried out to model
It tests, as a result such as Figure 14, as can be seen from Figure 15 maximum absorption band appears in 1.56GHz, and absorption value is -30dB, effectively inhales intensity of wave -
12dB absorption band width is 0.3GHz.
Adhere to grade：Using GB/T 9286-1998 according to national standards《The cross cut test of paint and varnish paint film》It carries out
It measures, attachment grade is 1 grade.
Experiment five：
The preparation method of low-frequency electromagnetic wave absorbing material follows the steps below：
One, according to Fe3+With Co2+Molar ratio is 3:2 ratio is by the Fe of a concentration of 0.5mol/L3+Aqueous solution and a concentration of
The Co of 0.5mol/L2+Aqueous solution mixes, and obtains mixed liquor, then by 80 DEG C of 25ml mixed liquors instillation, the 50mL of a concentration of 10mol/L
It is uniformly mixed in NaOH solution, 10ml Tween 80s is added, constant temperature persistently stirs 45 minutes, obtains black suspension；
Two, 0.5g CNTs are added in 20ml distilled water, are stirred with 400 revs/min of mixing speed and are warming up to 80
DEG C, 1g neopelexes are added, CNTs deployment conditions are observed after being completely dispersed dissolving, when CNTs divides with uniformly having levels
It is dispersed in distilled water, and grain size becomes smaller, adds 0.5g Tween 80s, persistently stir 30min, obtain CNTs dispersion liquids；
Three, black suspension is added in CNTs dispersion liquids, obtains CoFe2O4With the mixed liquor of CNTs, by CoFe2O4
It is transferred in hydrothermal reaction kettle with the mixed liquor of CNTs, keeps the temperature 4 hours in 200 DEG C of insulating boxs, reaction kettle is cooled to room temperature, so
Decompression suction filtration is carried out to powder afterwards, and is washed 3 times with distilled water and methanol respectively, in 50 DEG C of freeze-day with constant temperature 12 hours, is obtained
CoFe2O4/ CNTs loads powder；
Four, it is 1 by 1g mass ratioes:1.5 CoFe2O4/ CNTs loads powder and Zn0.4Mn0.6Fe2O4Powder is put into beaker,
It is dissolved with the cyclohexane solvent of 50ml, is heated to 50 DEG C and is stirred 30 minutes with 400 revs/min of mixing speed；Beaker is placed on by force
40 minutes on magnet, the powder not dissolved is made to settle down；Upper solution is poured into another beaker, and is put into spitting for 0.1g
Warm 80 surfactants are heated to 50 DEG C and are stirred 30 minutes with 400 revs/min of speed, settled 40 minutes on strong magnet, will be upper
In layer liquid pouring to another beaker, 1g carbon nanotubes are added and are sufficiently stirred, obtain electro-magnetic wave absorption agent dispersing liquid；
Five, equipped with stirring, thermometer, condenser pipe four-hole bottle in, 10g toluene di-isocyanate(TDI)s and 10g polyethers is added
Dihydric alcohol is gradually heating to 80 DEG C, is reacted 1.3 hours at a temperature of being maintained at 80 DEG C, cooling, when temperature is down to 74 DEG C, is added
1g hydrophilic chain extenders dihydromethyl propionic acid, 5g asphalt mixtures modified by epoxy resin was added in 70 DEG C of isothermal reactions 1 hour in 5g chain extender 1,4-butanediol
Fat and 1g internal crosslinker N-Methyl pyrrolidones, and 0.1g catalyst dibutyl tin dilaurates are added, isothermal reaction 3 hours,
Obtain polyurethane modified epoxy resin binder；
Six, 1g electro-magnetic wave absorption agent dispersing liquids are distributed in 10g polyurethane modified epoxy resin binders, in 60 DEG C of perseverances
Temperature stirring 5 hours, when being cooled to 40 DEG C, low whipping speed rapidly joins 5g triethylamines under the conditions of being 15000 revs/min and 10ml is gone
The mixture of ionized water is added 2.5g ethylenediamines and carries out chain extension, continues to stir 5 minutes with 15000 revs/min of mixing speed, obtain
To low-frequency electromagnetic wave absorbing material.
Gained low-frequency electromagnetic wave absorbing material is sprayed using spray gun in 10cm × 10cmABS resin board surfaces, is sprayed
It is smooth to be applied to surface, 50 DEG C of baking oven isothermal curing 12 hours forms the film of 1.5mm thickness.Electro-magnetic wave absorption is carried out to model
It tests, as a result such as Figure 16, as can be seen from Figure 17 maximum absorption band appears in 1.56GHz, and absorption value is -15.5dB, and it is strong effectively to inhale wave
Degree -12dB absorption band width is 0.24GHz.
Adhere to grade：Using GB/T 9286-1998 according to national standards《The cross cut test of paint and varnish paint film》It carries out
It measures, attachment grade is 1 grade.
Experiment six：
The preparation method of low-frequency electromagnetic wave absorbing material follows the steps below：
One, according to Fe3+With Co2+Molar ratio is 3:2 ratio is by the Fe of a concentration of 0.5mol/L3+Aqueous solution and a concentration of
The Co of 0.5mol/L2+Aqueous solution mixes, and obtains mixed liquor, then by 80 DEG C of 25ml mixed liquors instillation, the 50mL of a concentration of 10mol/L
It is uniformly mixed in NaOH solution, 10ml Tween 80s is added, constant temperature persistently stirs 45 minutes, obtains black suspension；
Two, 0.5g CNTs are added in 20ml distilled water, are stirred with 400 revs/min of mixing speed and are warming up to 80
DEG C, 1g neopelexes are added, CNTs deployment conditions are observed after being completely dispersed dissolving, when CNTs divides with uniformly having levels
It is dispersed in distilled water, and grain size becomes smaller, adds 0.5g Tween 80s, persistently stir 30min, obtain CNTs dispersion liquids；
Three, black suspension is added in CNTs dispersion liquids, obtains CoFe2O4With the mixed liquor of CNTs, by CoFe2O4
It is transferred in hydrothermal reaction kettle with the mixed liquor of CNTs, keeps the temperature 4 hours in 200 DEG C of insulating boxs, reaction kettle is cooled to room temperature, so
Decompression suction filtration is carried out to powder afterwards, and is washed 3 times with distilled water and methanol respectively, in 50 DEG C of freeze-day with constant temperature 12 hours, is obtained
CoFe2O4/ CNTs loads powder；
Four, it is 1 by 1g mass ratioes:2 CoFe2O4/ CNTs loads powder and Zn0.4Mn0.6Fe2O4Powder is put into beaker, is used
The cyclohexane solvent of 50ml dissolves, and is heated to 50 DEG C and is stirred 30 minutes with 400 revs/min of mixing speed；Beaker is placed on strong magnetic
40 minutes on iron, the powder not dissolved is made to settle down；Upper solution is poured into another beaker, and is put into the tween of 0.1g
80 surfactants are heated to 50 DEG C and are stirred 30 minutes with 400 revs/min of speed, settled 40 minutes on strong magnet, by upper layer
In liquid pouring to another beaker, 1g carbon nanotubes are added and are sufficiently stirred, obtain electro-magnetic wave absorption agent dispersing liquid；
Five, equipped with stirring, thermometer, condenser pipe four-hole bottle in, 10g toluene di-isocyanate(TDI)s and 10g polyethers is added
Dihydric alcohol is gradually heating to 80 DEG C, is reacted 1.5 hours at a temperature of being maintained at 80 DEG C, cooling, when temperature is down to 75 DEG C, is added
1g hydrophilic chain extenders dihydromethyl propionic acid, 5g asphalt mixtures modified by epoxy resin was added in 70 DEG C of isothermal reactions 1 hour in 5g chain extender 1,4-butanediol
Fat and 1g internal crosslinker N-Methyl pyrrolidones, and 0.1g catalyst dibutyl tin dilaurates are added, isothermal reaction 3.2 is small
When, obtain polyurethane modified epoxy resin binder；
Six, 1g electro-magnetic wave absorption agent dispersing liquids are distributed in 10g polyurethane modified epoxy resin binders, in 60 DEG C of perseverances
Temperature stirring 4.5 hours, when being cooled to 40 DEG C, low whipping speed rapidly joins 5g triethylamines and 10ml under the conditions of being 15000 revs/min
The mixture of deionized water is added 2.5g ethylenediamines and carries out chain extension, continues to stir 5 minutes with 15000 revs/min of mixing speed,
Obtain low-frequency electromagnetic wave absorbing material.
Gained low-frequency electromagnetic wave absorbing material is sprayed using spray gun in 10cm × 10cmABS resin board surfaces, is sprayed
It is smooth to be applied to surface, 50 DEG C of baking oven isothermal curing 12 hours forms the film of 1.5mm thickness.Electro-magnetic wave absorption is carried out to model
It tests, as a result such as Figure 18, as can be seen from Figure 19 maximum absorption band appears in 1.48GHz, and absorption value is -14dB, effectively inhales intensity of wave -
12dB absorption band width is 0.2GHz.
Adhere to grade：Using GB/T 9286-1998 according to national standards《The cross cut test of paint and varnish paint film》It carries out
It measures, attachment grade is 1 grade.
Claims (10)
1. the preparation method of low-frequency electromagnetic wave absorbing material, it is characterised in that the preparation method of low-frequency electromagnetic wave absorbing material according to
Following steps carry out：
One, according to Fe3+With Co2+Molar ratio is 3:2 ratio is by the Fe of a concentration of 0.5mol/L3+Aqueous solution and a concentration of
The Co of 0.5mol/L2+Aqueous solution mixes, and obtains mixed liquor, then by 80 DEG C of 25ml mixed liquors instillation, the 50mL of a concentration of 10mol/L
It is uniformly mixed in NaOH solution, 10ml Tween 80s is added, constant temperature persistently stirs 45 minutes, obtains black suspension；
Two, 0.2g~1g CNTs are added in 20ml distilled water, are stirred with 400 revs/min of mixing speed and are warming up to 80
DEG C, 1g neopelexes are added, CNTs deployment conditions are observed after being completely dispersed dissolving, when CNTs divides with uniformly having levels
It is dispersed in distilled water, and grain size becomes smaller, adds 0.5g Tween 80s, persistently stir 30min, obtain CNTs dispersion liquids；
Three, black suspension is added in CNTs dispersion liquids, obtains CoFe2O4With the mixed liquor of CNTs, by CoFe2O4With CNTs
Mixed liquor be transferred in hydrothermal reaction kettle, keep the temperature 4 hours in 200 DEG C of insulating boxs, reaction kettle is cooled to room temperature, then to powder
Body carries out decompression suction filtration, and is washed 3 times with distilled water and methanol respectively, in 50 DEG C of freeze-day with constant temperature 12 hours, obtains CoFe2O4/
CNTs loads powder；
Four, it is 1 by 1g mass ratioes:1~2 CoFe2O4/ CNTs loads powder and Zn0.4Mn0.6Fe2O4Powder is put into beaker, is used
The cyclohexane solvent of 50ml dissolves, and is heated to 50 DEG C and is stirred 30 minutes with 400 revs/min of mixing speed；Beaker is placed on strong magnetic
40 minutes on iron, the powder not dissolved is made to settle down；Upper solution is poured into another beaker, and is put into the tween of 0.1g
80 surfactants are heated to 50 DEG C and are stirred 30 minutes with 400 revs/min of speed, settled 40 minutes on strong magnet, by upper layer
In liquid pouring to another beaker, 1g carbon nanotubes are added and are sufficiently stirred, obtain electro-magnetic wave absorption agent dispersing liquid；
Five, equipped with stirring, thermometer, condenser pipe four-hole bottle in, 10g toluene di-isocyanate(TDI)s and 10g polyethers binary is added
Alcohol is gradually heating to 80 DEG C, is reacted 1~1.5 hour at a temperature of being maintained at 80 DEG C, and cooling when temperature is down to 70~75 DEG C, adds
Enter 5g chain extender 1,4-butanediol, in 70 DEG C of isothermal reactions 1 hour, 1g hydrophilic chain extenders dihydromethyl propionic acid, 5g epoxies is added
Resin and 1g internal crosslinker N-Methyl pyrrolidones, and 0.1g catalyst dibutyl tin dilaurates, isothermal reaction 3~4 is added
Hour, obtain polyurethane modified epoxy resin binder；
Six, 1g electro-magnetic wave absorption agent dispersing liquids are distributed in 10g polyurethane modified epoxy resin binders, are stirred in 60 DEG C of constant temperature
It mixes 4~6 hours, when being cooled to 40 DEG C, low whipping speed rapidly joins 5g triethylamines under the conditions of being 15000 revs/min and 10ml is gone
The mixture of ionized water is added 2.5g ethylenediamines and carries out chain extension, continues to stir 5 minutes with 15000 revs/min of mixing speed, obtain
To low-frequency electromagnetic wave absorbing material.
2. the preparation method of low-frequency electromagnetic wave absorbing material according to claim 1, it is characterised in that be maintained in step 5
It is reacted 1.1-1.3 hours at a temperature of 80 DEG C.
3. the preparation method of low-frequency electromagnetic wave absorbing material according to claim 1, it is characterised in that in temperature in step 5
When being down to 71 DEG C, 5g chain extender 1,4-butanediol is added.
4. the preparation method of low-frequency electromagnetic wave absorbing material according to claim 1, it is characterised in that in temperature in step 5
When being down to 72 DEG C, 5g chain extender 1,4-butanediol is added.
5. the preparation method of low-frequency electromagnetic wave absorbing material according to claim 1, it is characterised in that in temperature in step 5
When being down to 73 DEG C, 5g chain extender 1,4-butanediol is added.
6. the preparation method of low-frequency electromagnetic wave absorbing material according to claim 1, it is characterised in that in temperature in step 5
When being down to 74 DEG C, 5g chain extender 1,4-butanediol is added.
7. the preparation method of low-frequency electromagnetic wave absorbing material according to claim 1, it is characterised in that in step 5 and be added
0.1g catalyst dibutyl tin dilaurates, isothermal reaction 3.5 hours.
8. the preparation method of low-frequency electromagnetic wave absorbing material according to claim 1, it is characterised in that by 1g electricity in step 6
Electro-magnetic wave absorption agent dispersing liquid is distributed in 10g polyurethane modified epoxy resin binders, is stirred 4.2 hours in 60 DEG C of constant temperature.
9. the preparation method of low-frequency electromagnetic wave absorbing material according to claim 1, it is characterised in that by 1g electricity in step 6
Electro-magnetic wave absorption agent dispersing liquid is distributed in 10g polyurethane modified epoxy resin binders, is stirred 4.5 hours in 60 DEG C of constant temperature.
10. the preparation method of low-frequency electromagnetic wave absorbing material according to claim 1, it is characterised in that by 1g electricity in step 6
Electro-magnetic wave absorption agent dispersing liquid is distributed in 10g polyurethane modified epoxy resin binders, is stirred 5 hours in 60 DEG C of constant temperature.
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