CN106009111A - Composite shielding material and preparation method thereof - Google Patents
Composite shielding material and preparation method thereof Download PDFInfo
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- CN106009111A CN106009111A CN201610552490.5A CN201610552490A CN106009111A CN 106009111 A CN106009111 A CN 106009111A CN 201610552490 A CN201610552490 A CN 201610552490A CN 106009111 A CN106009111 A CN 106009111A
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- 239000000463 material Substances 0.000 title claims abstract description 36
- 239000002131 composite material Substances 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000010439 graphite Substances 0.000 claims abstract description 41
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 41
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000006247 magnetic powder Substances 0.000 claims abstract description 36
- 229920001971 elastomer Polymers 0.000 claims abstract description 21
- 239000005060 rubber Substances 0.000 claims abstract description 21
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 13
- 239000002270 dispersing agent Substances 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims description 68
- 238000003490 calendering Methods 0.000 claims description 10
- 229910002796 Si–Al Inorganic materials 0.000 claims description 8
- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 claims description 8
- -1 phosphate ester Chemical class 0.000 claims description 7
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- PHYFQTYBJUILEZ-IUPFWZBJSA-N triolein Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OCC(OC(=O)CCCCCCC\C=C/CCCCCCCC)COC(=O)CCCCCCC\C=C/CCCCCCCC PHYFQTYBJUILEZ-IUPFWZBJSA-N 0.000 claims description 6
- 229920000459 Nitrile rubber Polymers 0.000 claims description 5
- BAECOWNUKCLBPZ-HIUWNOOHSA-N Triolein Natural products O([C@H](OCC(=O)CCCCCCC/C=C\CCCCCCCC)COC(=O)CCCCCCC/C=C\CCCCCCCC)C(=O)CCCCCCC/C=C\CCCCCCCC BAECOWNUKCLBPZ-HIUWNOOHSA-N 0.000 claims description 5
- PHYFQTYBJUILEZ-UHFFFAOYSA-N Trioleoylglycerol Natural products CCCCCCCCC=CCCCCCCCC(=O)OCC(OC(=O)CCCCCCCC=CCCCCCCCC)COC(=O)CCCCCCCC=CCCCCCCCC PHYFQTYBJUILEZ-UHFFFAOYSA-N 0.000 claims description 5
- SRSXLGNVWSONIS-UHFFFAOYSA-N benzenesulfonic acid Chemical compound OS(=O)(=O)C1=CC=CC=C1 SRSXLGNVWSONIS-UHFFFAOYSA-N 0.000 claims description 5
- 229940092714 benzenesulfonic acid Drugs 0.000 claims description 5
- 150000004675 formic acid derivatives Chemical class 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 claims description 4
- 229910019142 PO4 Inorganic materials 0.000 claims description 4
- 239000005062 Polybutadiene Substances 0.000 claims description 4
- 239000004147 Sorbitan trioleate Substances 0.000 claims description 4
- PRXRUNOAOLTIEF-ADSICKODSA-N Sorbitan trioleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](OC(=O)CCCCCCC\C=C/CCCCCCCC)[C@H]1OC[C@H](O)[C@H]1OC(=O)CCCCCCC\C=C/CCCCCCCC PRXRUNOAOLTIEF-ADSICKODSA-N 0.000 claims description 4
- 235000019400 benzoyl peroxide Nutrition 0.000 claims description 4
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims description 4
- 230000014759 maintenance of location Effects 0.000 claims description 4
- 239000010452 phosphate Substances 0.000 claims description 4
- 229920002857 polybutadiene Polymers 0.000 claims description 4
- 229920002379 silicone rubber Polymers 0.000 claims description 4
- 239000004945 silicone rubber Substances 0.000 claims description 4
- 229960000391 sorbitan trioleate Drugs 0.000 claims description 4
- 235000019337 sorbitan trioleate Nutrition 0.000 claims description 4
- 239000004575 stone Substances 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 2
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims 3
- 239000003292 glue Substances 0.000 claims 2
- ZFFMLCVRJBZUDZ-UHFFFAOYSA-N 2,3-dimethylbutane Chemical group CC(C)C(C)C ZFFMLCVRJBZUDZ-UHFFFAOYSA-N 0.000 claims 1
- 125000003236 benzoyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C(*)=O 0.000 claims 1
- 230000000694 effects Effects 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 5
- 238000005987 sulfurization reaction Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 230000005670 electromagnetic radiation Effects 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 239000006249 magnetic particle Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OKIRBHVFJGXOIS-UHFFFAOYSA-N 1,2-di(propan-2-yl)benzene Chemical compound CC(C)C1=CC=CC=C1C(C)C OKIRBHVFJGXOIS-UHFFFAOYSA-N 0.000 description 1
- 241000538562 Banjos Species 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000013528 metallic particle Substances 0.000 description 1
- WDWDWGRYHDPSDS-UHFFFAOYSA-N methanimine Chemical compound N=C WDWDWGRYHDPSDS-UHFFFAOYSA-N 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
-
- 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
- C08K13/04—Ingredients characterised by their shape and organic or inorganic ingredients
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
- B29B7/7461—Combinations of dissimilar mixers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
- B29C43/24—Calendering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/001—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore a shaping technique combined with cutting, e.g. in parts or slices combined with rearranging and joining the cut parts
-
- 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
-
- 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
- C08K3/08—Metals
-
- 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
- C08K7/00—Use of ingredients characterised by shape
-
- 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
- C08K7/00—Use of ingredients characterised by shape
- C08K7/22—Expanded, porous or hollow particles
- C08K7/24—Expanded, porous or hollow particles inorganic
-
- 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
- C08K2003/023—Silicon
-
- 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
- C08K3/08—Metals
- C08K2003/0812—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
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0856—Iron
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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
- C08K2201/002—Physical properties
- C08K2201/004—Additives being defined by their length
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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
- C08K2201/01—Magnetic additives
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Thermal Sciences (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a composite shielding material. The composite shielding material is prepared from the following components in parts by weight: 100 parts of expanded graphite, 100-900 parts of sheet magnetic powder, 0.6-2 parts of a dispersing agent, 100 parts of rubber, and 0.3-2 parts of a vulcanizing agent. The invention further discloses a preparation method of the composite shielding material. The prepared composite shielding material has the characteristics of high electromagnetic property, high shielding property and the like, and can have good wave absorbing property in a GHz frequency band.
Description
Technical field
The invention belongs to technical field of electromagnetic compatibility, be specifically related to a kind of composite shielding material and preparation method thereof.
Background technology
Along with developing rapidly of science and technology, various electronic apparatus use in a large number, and electromagnetic interference and electromagnetic radiation pollution are
Become a kind of environmental hazard.Utilize electromagnetic shielding material reflection or electromagnetic wave absorption, these harm can be reduced.Conventional electromagnetism
Shielding material, based on metal, generally uses sheet material, band or paint pattern, and these materials have in a lot of fields extensively should
With, but the some shortcomings of there is also, as big in density, construction complexity, the hard more difficult molding of quality etc..Therefore, research light weight, soft
The composite of shield effectiveness soft, high has stronger using value.Expanded graphite density is little, light weight, heat stability and change
Have good stability, and has extraordinary application potential.
Expanded graphite is obtained by crystalline flake graphite intercalation compound drastically expanded by heating, and the nanometer interlayer at expanded graphite has greatly
The duct that amount is open, these spaces can be used to magnetic-particle of lodging.Owing to graphite is chemical inertness so that magnetic-particle-swollen
Swollen graphite has good electric conductivity, and its electromagnet shield effect is the most excellent in 1～2GHz scope.
The electromagnetic shielding effect of expanded graphite is mainly derived from the ability of its highest reflection electromagnetic wave, and electromagnetic wave is anti-
Rate of penetrating is relevant in frequency, and frequency more high reflectance is the highest, therefore the electromagnet shield effect of expanded graphite is along with the fall of wave frequency
Low and strongly reduce.And electromagnetic absorption loss is relevant with the product of the relative conductivity of shielding material and relative permeability, therefore,
The metallic particles that relative permeability is higher mainly shields electromagnetic wave by absorption of electromagnetic radiation, therefore also has relatively in relatively low frequency
Good shield effectiveness, to this end, magnetic-particle-exfoliated-graphite composite can be prepared, wherein magnetic-particle plays absorption electromagnetism spoke
The effect penetrated, and expanded graphite plays the effect of reflecting electromagnetic radiation, so that composite may be at wider frequency range tool
There is good electromagnet shield effect.Additionally, expanded graphite lightweight, softness, anticorrosive, cheap, its composite may ratio
Conventional macromolecule electromagnetic shielding composite material has more preferable application potential.
Summary of the invention
The invention provides a kind of on the basis of at utmost improving material electromagnetic performance, improve the shielding effect of material
Can so that it is can have the composite shielding material of good electromagnetic wave shielding performance in ghz band.
Another object of the present invention is to provide the preparation method of above-mentioned composite shielding material.
The purpose of the present invention is achieved through the following technical solutions: a kind of composite shielding material, including by weight:
The thickness of described expanded graphite is 0.5～15 μm, a length of 50～200 μm.
Described lamellar magnetic powder is Fe-Si-Al, and in magnetic powder, Fe content is 78～90%, and Si content is 5～12%, Al content
Being 3～10%, the thickness of lamellar magnetic powder is in 0.3～5 μm, a length of 10-100 μm.
Described dispersant includes the one in glycerol trioleate, benzenesulfonic acid, phosphate ester and sorbitan trioleate.
Described rubber includes in nitrile rubber, EP rubbers, fluorubber, butadiene-styrene rubber, silicone rubber and butadiene rubber
Kind.
Described vulcanizing agent includes cumyl peroxide, dibenzoyl peroxide, hexamethylene diamine base formates and methylene ammonia
One in base formates.
The mixture of described expanded graphite and lamellar magnetic powder is binary mixture, and binary mixture with the mass ratio of rubber is
10:1～2:1.
Described lamellar magnetic powder with the mass ratio of expanded graphite is: (9:1)～(1:1).
The preparation method of above-mentioned composite shielding material, comprises the following steps:
1) prepared by expanded graphite: take 100 weight portion expansible graphites, is placed in the Muffle furnace of 600～800 DEG C, 0.5～
Taking out after 2min, be then placed in couveuse, holding temperature is less than 400 DEG C, and temperature retention time is 4～6min, finally prepares
Expanded graphite；
2) prepared by binary mixture: take step 1) prepare expanded graphite 100 weight portion and lamellar magnetic powder 100～900 weight
Amount part, is then added in homogenizing blender, and adds dispersant 0.6～2 weight portion, and mixing time is 1～3 hour, makes to mix
Compound mix homogeneously, then mixture is dried；
3) step 2 is taken) mixture for preparing is binary mixture, the mass ratio of binary mixture and rubber is 10:1～2:
1 puts into banburying in banbury, and banburying temperature is 80～100 DEG C, and the banburying time is 20～40 minutes, is subsequently adding vulcanizing agent 0.3
～2 weight portions, then banburying 20～40 minutes；
4) take step 3) prepare mixture, mixture is put into mill in mill, mill more than 5 times below 50 DEG C
After, then mixture is put into broken pelletize in pulverizer, the particle diameter of mixture is at 0.5mm～2mm；
5) take step 4) prepare granular mixture, granular mixture is put into calendering formation in calender, calendering
Temperature is 40～70 DEG C, by adjusting roll spacing, prepares the electromagnetic shielding sheet of 1.0mm thickness；
6) take step 5) prepare electromagnetic shielding sheet, electromagnetic shielding sheet is put in vulcanizing press and vulcanizes, sulfuration
Temperature is 150～180 DEG C, and pressure is 3～7MPa, vulcanizes 10～360s, then takes out cut-parts, by electromagnetic shielding sheet stamping-out Cheng Zhi
Footpath is the disk of 133mm.
Described step 1) in the thickness of expanded graphite be 0.5～15 μm, a length of 50～200 μm, step 2) in lamellar magnetic
Powder is Fe-Si-Al, and in magnetic powder, Fe content is 78～90%, and Si content is 5～12%, and Al content is 3～10%, lamellar magnetic powder
Thickness in 0.3～5 μm, a length of 10-100 μm.
Described dispersant includes the one in glycerol trioleate, benzenesulfonic acid, phosphate ester and sorbitan trioleate；
Rubber includes the one in nitrile rubber, EP rubbers, fluorubber, butadiene-styrene rubber, silicone rubber and butadiene rubber；Vulcanizing agent includes
One in cumyl peroxide, dibenzoyl peroxide, hexamethylene diamine base formates and methene amido formates.
The present invention has such advantages as relative to prior art and effect:
Composite shielding material prepared by the present invention, has high electromagnetic performance and high shielding properties, by choosing suitably
Absorbent lamellar Fe-Si-Al magnetic powder, expanded graphite and rubber by the regulation formula of material and preparation process condition, and
The shield effectiveness of material is improved so that it is can have well in ghz band on the basis of at utmost improving material electromagnetic performance
Electromagnetic wave shielding performance.The present invention fills lamellar Fe-Si-Al magnetic in the duct that the nanometer interlayer of expanded graphite opens in a large number
Powder also uses calendering technology to prepare composite, and this preparation technology is simple, can be mass-produced, and product thickness is uniform, and table
Face is smooth, and product appearance is excellent.In addition calendering formation can produce continuously, and automaticity is high, and efficiency is high and composite is close
Spending little, light weight, heat stability and chemical stability is good, cheap, electromagnet shield effect is excellent, than conventional macromolecule
Electromagnetic shielding composite material has more preferable application potential.
Accompanying drawing explanation
Fig. 1 is the shield effectiveness test figure of embodiment 3 in the present invention；
Fig. 2 is the shield effectiveness test figure of embodiment 4 in the present invention；
Fig. 3 is the shield effectiveness test figure of embodiment 5 in the present invention.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment 1
A kind of composite shielding material, including by weight:
The thickness of described expanded graphite is 0.5 μm, a length of 50 μm.
Described lamellar magnetic powder is Fe-Si-Al, and in magnetic powder, Fe content is 78%, and Si content is 12%, and Al content is 10%,
The thickness of lamellar magnetic powder is in 0.3 μm, a length of 10 μm.
Dispersant in the present embodiment is glycerol trioleate；Rubber is nitrile rubber；Vulcanizing agent is peroxidating diisopropyl
Benzene.
Expanded graphite and the mixture of lamellar magnetic powder in the present embodiment are binary mixture, binary mixture and rubber
Mass ratio is 2:1；Lamellar magnetic powder with the mass ratio of expanded graphite is: 1:1.
The preparation method of above-mentioned composite shielding material, comprises the following steps:
1) prepared by expanded graphite: takes 100 weight portion expansible graphites, is placed in the Muffle furnace of 600 DEG C, takes after 0.5min
Going out, be then placed in couveuse, holding temperature is less than 400 DEG C, and temperature retention time is 4min, finally prepares expanded graphite；
2) prepared by binary mixture: take step 1) prepare expanded graphite 100 weight portion and lamellar magnetic powder 100 weight portion,
Being then added in homogenizing blender, and add dispersant 0.6 weight portion, mixing time is 1 hour, makes mixture mixing all
Even, then mixture is dried；
3) take step 2) prepare mixture be binary mixture, binary mixture is that 2:1 puts into the mass ratio of rubber
Banburying in banbury, banburying temperature is 80 DEG C, and the banburying time is 20 minutes, is subsequently adding vulcanizing agent 0.3 weight portion, then banburying 20
Minute；
4) take step 3) prepare mixture, mixture is put into mill in mill, mill more than 5 times below 50 DEG C
After, then mixture is put into broken pelletize in pulverizer, the particle diameter of mixture is at 0.5mm；
5) take step 4) prepare granular mixture, granular mixture is put into calendering formation in calender, calendering
Temperature is 40 DEG C, by adjusting roll spacing, prepares the electromagnetic shielding sheet of 1.0mm thickness；
6) take step 5) prepare electromagnetic shielding sheet, electromagnetic shielding sheet is put in vulcanizing press and vulcanizes, sulfuration
Temperature is 150 DEG C, and pressure is 3MPa, vulcanizes 10s, then takes out cut-parts, electromagnetic shielding sheet stamping-out becomes the circle of a diameter of 133mm
Sheet.
Embodiment 2
A kind of composite shielding material, including by weight:
The thickness of the expanded graphite in the present embodiment is 15 μm, a length of 200 μm；Lamellar magnetic powder is Fe-Si-Al, magnetic powder
Middle Fe content is 90%, and Si content is 5%, and Al content is 5%, and the thickness of lamellar magnetic powder is in 5 μm, a length of 100 μm.
Dispersant in the present embodiment is benzenesulfonic acid；Rubber is EP rubbers；Vulcanizing agent is dibenzoyl peroxide.
Expanded graphite and the mixture of lamellar magnetic powder in the present embodiment are binary mixture, binary mixture and rubber
Mass ratio is 10:1；Lamellar magnetic powder with the mass ratio of expanded graphite is: 9:1.
The preparation method of above-mentioned composite shielding material, comprises the following steps:
1) prepared by expanded graphite: take 100 weight portion expansible graphites, is placed in the Muffle furnace of 800 DEG C, takes out after 2min,
Being then placed in couveuse, holding temperature is less than 400 DEG C, and temperature retention time is 6min, finally prepares expanded graphite；
2) prepared by binary mixture: take step 1) prepare expanded graphite 100 weight portion and lamellar magnetic powder 900 weight portion,
Being then added in homogenizing blender, and add dispersant 2 weight portion, mixing time is 3 hours, makes mixture mix homogeneously,
Again mixture is dried；
3) take step 2) prepare mixture be binary mixture, binary mixture is that 10:1 puts into the mass ratio of rubber
Banburying in banbury, banburying temperature is 100 DEG C, and the banburying time is 40 minutes, is subsequently adding vulcanizing agent 2 weight portion, then banburying 40
Minute；
4) take step 3) prepare mixture, mixture is put into mill in mill, mill more than 5 times below 50 DEG C
After, then mixture is put into broken pelletize in pulverizer, the particle diameter of mixture is at 2mm；
5) take step 4) prepare granular mixture, granular mixture is put into calendering formation in calender, calendering
Temperature is 70 DEG C, by adjusting roll spacing, prepares the electromagnetic shielding sheet of 1.0mm thickness；
6) take step 5) prepare electromagnetic shielding sheet, electromagnetic shielding sheet is put in vulcanizing press and vulcanizes, sulfuration
Temperature is 180 DEG C, and pressure is 7MPa, vulcanizes 360s, then takes out cut-parts, electromagnetic shielding sheet stamping-out is become a diameter of 133mm's
Disk.
Embodiment 3
Take 3000 parts of expansible graphites (being called for short Kp) to be placed in the Muffle furnace of 700 DEG C, take out after 1min and i.e. obtain expanding stone
Ink, is denoted as EG.Lamellar FeSiAl magnetic powder (900 parts) and expanded graphite (100 parts) (mass ratio is 9:1) are joined homogenizing stirring
In machine, and add appropriate ethanol and dispersant glycerol trioleate 2 parts, stir 2h, make mixture mix homogeneously, then will mixing
Thing is dried.Select fluorubber, lamellar FeSiAl magnetic powder, cumyl peroxide (DCP) as matrix, absorbent and sulfuration respectively
Agent.
100 parts of fluorubber and 1000 parts of lamellar FeSiAl magnetic powders are put into banburying in banbury with expanded graphite mixture,
Banburying temperature is 90 DEG C, adds 4 parts of vulcanizing agent cumyl peroxides (DCP) after banburying 30 minutes, then banburying 30 minutes.Will be mixed
Compound puts into mill in mill after taking out, and at 50 DEG C after mill 5 times, then mixture is put into broken pelletize in pulverizer,
The particle diameter of mixture is at 0.5mm～2mm.Then calendering formation during granular mixture puts into calender, rolling temperature is 60 DEG C,
By adjusting roll spacing, prepare the electromagnetic shielding sheet of 1.0mm thickness.Last electromagnetic shielding sheet is put into and is carried out sulfur in vulcanizing press
Changing, curing temperature is 170 DEG C, and pressure is 5MPa, takes out cut-parts after sulfuration 15s.Noise suppression sheet stamping-out is become a diameter of 133mm
Disk for shield effectiveness test.Shielding properties test uses KeySight N5232A Network Analyzer and coaxial banjo clip
The shield effectiveness of tool composition is measured system and is carried out the shield effectiveness S of measuring samples 1M～3GHz frequency21.Shield effectiveness test result is such as
Shown in Fig. 1, along with the increase of frequency, the shield effectiveness S of sample21Be gradually reduced, when frequency is 3GHz, sample shielding effect
Can be minimum, reach-25dB.
Embodiment 4
The present embodiment difference from Example 3 is: the expanded graphite in the present embodiment and lamellar FeSiAl magnetic powder matter
Amount is 1:1；As in figure 2 it is shown, along with the increase of frequency, the shield effectiveness S of sample21It is gradually reduced, when frequency is 3GHz, sample
Shield effectiveness minimum, reach-31.2dB.
Embodiment 5
The present embodiment difference from Example 3 is: the curing temperature in the present embodiment is 175 DEG C；As it is shown on figure 3,
Along with the increase of frequency, the shield effectiveness S of sample21Be gradually reduced, when frequency is 3GHz, sample shield effectiveness minimum,
Reach-32.5dB.Now the preparation technology of sample is optimum, shield effectiveness S21Best.
Embodiment 6～15
Embodiment 6～15 difference from Example 3 is, as shown in the table:
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are not by above-described embodiment
Limit, the change made under other any spirit without departing from the present invention and principle, modify, substitute, combine, simplify,
All should be the substitute mode of equivalence, within being included in protection scope of the present invention.
Claims (10)
1. a composite shielding material, it is characterised in that include by weight:
Composite shielding material the most according to claim 1, it is characterised in that: the thickness of described expanded graphite is 0.5～15 μ
M, a length of 50～200 μm.
Composite shielding material the most according to claim 2, it is characterised in that: described lamellar magnetic powder is Fe-Si-Al, magnetic powder
Middle Fe content is 78～90%, and Si content is 5～12%, and Al content is 3～10%, the thickness of lamellar magnetic powder in 0.3～5 μm,
A length of 10-100 μm.
Composite shielding material the most according to claim 1, it is characterised in that: described dispersant include glycerol trioleate,
One in benzenesulfonic acid, phosphate ester and sorbitan trioleate.
Composite shielding material the most according to claim 1, it is characterised in that: described rubber includes nitrile rubber, second the third rubber
One in glue, fluorubber, butadiene-styrene rubber, silicone rubber and butadiene rubber.
Composite shielding material the most according to claim 1, it is characterised in that: described vulcanizing agent includes peroxidating diisopropyl
One in benzene, dibenzoyl peroxide, hexamethylene diamine base formates and methene amido formates.
Composite shielding material the most according to claim 1, it is characterised in that: described expanded graphite and the mixing of lamellar magnetic powder
Thing is binary mixture, and binary mixture is 10:1～2:1 with the mass ratio of rubber；Lamellar magnetic powder and the mass ratio of expanded graphite
For: (9:1)～(1:1).
8. according to the preparation method of the composite shielding material described in any one of claim 1～7, it is characterised in that include following
Step:
1) prepared by expanded graphite: take 100 weight portion expansible graphites, is placed in the Muffle furnace of 600～800 DEG C, after 0.5～2min
Taking out, be then placed in couveuse, holding temperature is less than 400 DEG C, and temperature retention time is 4～6min, finally prepares and expands stone
Ink；
2) prepared by binary mixture: take step 1) prepare expanded graphite 100 weight portion and lamellar magnetic powder 100～900 weight portion,
Being then added in homogenizing blender, and add dispersant 0.6～2 weight portion, mixing time is 1～3 hour, makes mixture mix
Close uniformly, then mixture is dried；
3) take step 2) prepare mixture be binary mixture, binary mixture is that 10:1～2:1 is put with the mass ratio of rubber
Entering banburying in banbury, banburying temperature is 80～100 DEG C, and the banburying time is 20～40 minutes, is subsequently adding vulcanizing agent 0.3～2
Weight portion, then banburying 20～40 minutes；
4) step 3 is taken) mixture for preparing, mixture is put into mill in mill, below 50 DEG C after mill more than 5 times,
Mixture is put into broken pelletize again in pulverizer, and the particle diameter of mixture is at 0.5mm～2mm；
5) take step 4) prepare granular mixture, granular mixture is put into calendering formation in calender, rolling temperature
It is 40～70 DEG C, by adjusting roll spacing, prepares the electromagnetic shielding sheet of 1.0mm thickness；
6) take step 5) prepare electromagnetic shielding sheet, electromagnetic shielding sheet is put in vulcanizing press and vulcanizes, curing temperature
Being 150～180 DEG C, pressure is 3～7MPa, vulcanizes 10～360s, then takes out cut-parts, electromagnetic shielding sheet stamping-out is become a diameter of
The disk of 133mm.
The preparation method of composite shielding material the most according to claim 8, it is characterised in that: described step 1) middle expansion stone
The thickness of ink is 0.5～15 μm, a length of 50～200 μm, step 2) in lamellar magnetic powder be Fe-Si-Al, in magnetic powder, Fe content is
78～90%, Si content is 5～12%, and Al content is 3～10%, and the thickness of lamellar magnetic powder is at 0.3～5 μm, a length of 10-
100μm。
The preparation method of composite shielding material the most according to claim 7, it is characterised in that: described dispersant includes three
One in olein, benzenesulfonic acid, phosphate ester and sorbitan trioleate；Rubber includes nitrile rubber, second the third rubber
One in glue, fluorubber, butadiene-styrene rubber, silicone rubber and butadiene rubber；Vulcanizing agent includes cumyl peroxide, peroxidating two
One in benzoyl, hexamethylene diamine base formates and methene amido formates.
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