CN102140186A - Natural rubber composite with electromagnetic shielding property and preparation method thereof - Google Patents
Natural rubber composite with electromagnetic shielding property and preparation method thereof Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 31
- 244000043261 Hevea brasiliensis Species 0.000 title claims abstract description 25
- 229920003052 natural elastomer Polymers 0.000 title claims abstract description 25
- 229920001194 natural rubber Polymers 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 49
- 239000004917 carbon fiber Substances 0.000 claims abstract description 49
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 45
- 229920001971 elastomer Polymers 0.000 claims abstract description 44
- 239000000463 material Substances 0.000 claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 12
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 9
- 239000006229 carbon black Substances 0.000 claims description 8
- 235000021355 Stearic acid Nutrition 0.000 claims description 7
- 230000003712 anti-aging effect Effects 0.000 claims description 7
- 239000011159 matrix material Substances 0.000 claims description 7
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 7
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 7
- 239000008117 stearic acid Substances 0.000 claims description 7
- 239000011787 zinc oxide Substances 0.000 claims description 7
- 239000006185 dispersion Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 239000000835 fiber Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000000967 suction filtration Methods 0.000 claims description 5
- 239000005662 Paraffin oil Substances 0.000 claims description 4
- 238000007796 conventional method Methods 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 230000003044 adaptive effect Effects 0.000 abstract 1
- 238000013329 compounding Methods 0.000 abstract 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 235000019241 carbon black Nutrition 0.000 description 6
- 239000004593 Epoxy Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000011056 performance test Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 239000005864 Sulphur Substances 0.000 description 3
- 229920002521 macromolecule Polymers 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 239000012188 paraffin wax Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 206010070834 Sensitisation Diseases 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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- 239000011231 conductive filler Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
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- 238000005260 corrosion Methods 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
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- 239000013536 elastomeric material Substances 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005288 electromagnetic effect Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 235000012054 meals Nutrition 0.000 description 1
- 230000004630 mental health Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
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- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- -1 phenolic aldehyde Chemical class 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920001195 polyisoprene Polymers 0.000 description 1
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- 230000002787 reinforcement Effects 0.000 description 1
- 230000008313 sensitization Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
- 238000001721 transfer moulding Methods 0.000 description 1
- 229920006305 unsaturated polyester Polymers 0.000 description 1
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides a natural rubber composite with an electromagnetic shielding property. The composite comprises natural rubber, a short carbon fiber and a compounding agent, wherein the diameter of the short carbon fiber is 3-10 mu m, the length of the short carbon fiber is 1-5 mm, and the weight ratio of the natural rubber to the short carbon fiber at room temperature is 100:(0.5-11). Because the physical and mechanical properties of the natural rubber and the short carbon fiber are fully used for preparing the composite with the electromagnetic shielding property, the composite has the good electromagnetic wave absorption property of the short carbon fiber and the good physical and mechanical properties of the rubber material, and can be adaptive to the requirement on various environments. The composite has the advantages that the electromagnetic shielding property is high, the preparation method is simple, the preparation cost is low, and the energy consumption is reduced.
Description
Technical field
The invention belongs to the electromagnetic shielding material field, exactly is a kind of native rubber composite material with capability of electromagnetic shielding and preparation method thereof
Background technology
The electromagnetic interference that electromagenetic wave radiation produces not only can influence the normal operation of various electronicss, also can cause severe impairment for the physical and mental health that is in people in the electromagenetic wave radiation environment for a long time.Because macromolecular material has good physics and mechanical property, therefore develop capability of electromagnetic shielding height, low cost of manufacture, the simple electromagnetic shielding macromolecule material of preparation method and be very important.The metal foil composite bed or the coating of top layer conductivity type electromagnetic shielding macromolecule material are peeled off in the use and the course of processing easily, and mechanical property is relatively poor, therefore use less.The filler that the filled-type composite electromagnetic screen macromolecular material of present more employing is used generally is a metal powder, as is widely used in the conductive rubber in the EMC field, just is to use silver powder and nickel powder to do filler.Chinese patent ZL200820172030.0 discloses " a kind of composite electromagnetic screen rubber " technology, is the mode that adopts two-layer compound or MULTILAYER COMPOSITE, is composited with the functional rubber with capability of electromagnetic shielding by decorating rubber.Functional rubber is made up of the meal that silicon rubber, fluosilicic rubber or terpolymer EP rubber interpolation silver powder, silvered aluminum powder, silvered glass microballon, silver-plated copper powder, silver-plated nickel powder etc. have electromagnetic shielding action.Be that decoration rubber and conductive rubber is compound.Chinese patent 200910068462.6 discloses " made from three-dimensional braided nickel-plated carbon fiber and Resins, epoxy electromagnetic shielding composite material and preparation method ", proposition with carbon fiber electrically nickel plating metal after, carry out three-dimensional four-way braiding, adopt resin transfer molding (RTM) process (RTM) then, the knitted body and the Resins, epoxy of nickel-coated carbon fibers is compound, prepare electromagnetic shielding composite material.In order to reach shield effectiveness, carbon fiber has been carried out surface modification (sensitization processing, metallizing), and woven, to promote the formation of conductive network.Above-mentioned technology is owing to used noble metal materials such as silver, nickel, copper, and employed material only is confined to kinds such as silica gel, fluorine glue, ethylene-propylene diene copolymer, Resins, epoxy.Therefore ubiquity manufacturing cost height, complex process, easily problem such as pollute, be not suitable for large-scale promotion application.
Summary of the invention
The present invention is in order to overcome the defective in the above-mentioned technology, make full use of the natural rubber material and have stretching and tear strength height, the characteristics of good combination properties such as elasticity, wear resistance, binding property, ageing resistance propose a kind of native rubber composite material with capability of electromagnetic shielding and preparation method thereof.
The present invention seeks to realize: a kind of native rubber composite material with capability of electromagnetic shielding by following technical scheme, it is characterized in that this matrix material comprises natural rubber, chopped carbon fiber and Synergist S-421 95, described chopped carbon fiber diameter is 3~10 μ m, its length is 1~5mm, and the normal temperature weight part proportioning of natural rubber and chopped carbon fiber is: 100: 0.5~11.
Because natural rubber is cis 1 more than 98%, the chain macromolecule compound that the 4-polyisoprene constitutes, its comprehensive physical and mechanical properties is better than other any rubber, natural rubber has good flex fatig resistance performance, the dynamic lag loss is little, it is low to give birth to heat, and has good air-tightness, water-repellancy, electrical insulating property and thermal insulation and winter hardiness.Natural rubber belongs to crystallinity rubber, and low temperature descends and the force-extension effect all can produce crystallization, and good from reinforcement, pure glue cross-linked rubber tensile strength can reach 17-25MPa.The process industrial art performance of natural rubber is better than other all rubber.As plasticate, mixing ratio is easier to, Synergist S-421 95 is easy to sneak into, and is uniformly dispersed, and gives birth to less calories, the die mould shrinking percentage is little, green tack is good etc.
Carbon fiber is a kind of conductive filler material preferably, carbon fiber proportion is little, diameter is thin, length-to-diameter ratio is big, have advantages such as high strength, high-modulus, chemical stability be good, easily form conductive network, its electroconductibility is between carbon black and graphite, and it also has corrosion-resistant, radiation hardness, multiple premium properties such as high temperature resistant.Aerospace have been widely used in, material and chemical anticorrosion field with matrix materials such as carbon fiber reinforced unsaturated polyester, epoxy, phenolic aldehyde.But carbon fiber processing difficulties, cost height have limited its development to a certain extent.And the behavior of chopped carbon fiber in rubber matrix is similar to dipole, under electromagnetic field effect, produce polarized dissipation current, around under the matrix effect, dispersion current is attenuated, electromagnetic wave energy is converted to the energy of other form like this, and the chopped carbon fiber rubber composite shows as wave absorbtion to hertzian wave.The variation of chopped carbon fiber content means that variation has taken place the distance between harmonic oscillator, thereby make it present multiple-effect: when content is low to electromagnetic effect, a little less than the interaction between each oscillator, connect each other by impedance between each independent harmonic oscillator, each dipole increases absorption peak to the synergetic result of absorption of electromagnetic wave; When chopped carbon fiber content was increased to a certain degree, power line repelled mutually between close mutually oscillator, and the electric field mutual superposition demonstrates the strong electromagnetic wave reflection characteristic.Increase along with the chopped carbon fiber volume, the chopped carbon fiber rubber composite has conductor characteristics gradually, the reflection of electromagnetic wave rate is increased, and when the chopped carbon fiber volume reached certain value, the chopped carbon fiber rubber composite was changed to reflecting properties by the absorption of electromagnetic wave performance.The chopped carbon fiber that will have conductivity mixes and prepares matrix material in the natural rubber, has both had the advantage of natural rubber, has capability of electromagnetic shielding preferably again.The chopped carbon fiber that mixes has changed the complex phase magnetic permeability and relative dielectric parameter of natural rubber, has improved electromagnetic reflection potential.
The thickness of native rubber composite material of the present invention is 0.5mm~15mm.Can satisfy requirement to electromagnetic shielding material.
Described other Synergist S-421 95s are stearic acid, zinc oxide, anti-aging agent, carbon black, paraffin oil, promotor and vulcanizing agent.
A kind of preparation method with native rubber composite material of capability of electromagnetic shielding, its process is as follows:
(1) chopped carbon fiber is fully disperseed in hollander, dispersion liquid carries out suction filtration and thorough drying, becomes short and cuts dispersive carbon fiber monofilament, and its Fibre diameter is 3~10 μ m, and length is 1~5mm;
(2) natural rubber and the chopped carbon fiber ratio according to normal temperature weight part 100: 0.5~11 is equipped with, other Synergist S-421 95 consumption is equipped with according to a conventional method;
(3) in Banbury mixer or mill, will plasticate by the natural rubber that above-mentioned weight part is equipped with earlier, add chopped carbon fiber and other Synergist S-421 95s then and carry out mixingly, mixing even back compressing tablet obtains rubber unvulcanizate, and rubber unvulcanizate was at room temperature parked 24 hours;
(4) be sulfided into the sheet material that thickness is 0.5mm~15mm.
Other Synergist S-421 95s described in the preparation method are stearic acid, zinc oxide, anti-aging agent, carbon black, paraffin oil, promotor and vulcanizing agent.
This electromagnetic shielding native rubber composite material is through performance test: tensile strength is 14~16MPa, and under the condition of 10K~18GHz, electromagnet shield effect is 62.3~86.6dB.
Advantage of the present invention is: make full use of the good physical and mechanical properties of natural rubber and chopped carbon fiber, make the matrix material of electromagnetic shielding, make it both have the good absorption of electromagnetic wave performance of chopped carbon fiber, have the elastomeric material excellent physical and mechanical properties again, can adapt to the needs of multiple environment; The capability of electromagnetic shielding height, the preparation method is simple, and low cost of manufacture has reduced energy consumption.
Embodiment
Embodiment 1
Chopped carbon fiber is fully disperseed in hollander, and dispersion liquid carries out suction filtration and thorough drying, obtains weak point and cuts dispersive carbon fiber monofilament, and Fibre diameter is 3 μ m, and its length is 1mm; In Banbury mixer or mill, 5min plasticates 100 parts by weight of natural rubber earlier, add 2 parts of stearic acid, 5 parts of zinc oxide, 1 part of anti-aging agent, 60 parts of carbon blacks, 3 parts of chopped carbon fibers, 3 parts of paraffin oils, 1 part of promotor and 2.5 parts of sulphur then by weight successively, carry out mixing 8min again, mixing even back compressing tablet obtains rubber unvulcanizate; Rubber unvulcanizate was at room temperature parked 24 hours, sulfidization molding on the 50T vulcanizing press then, cure conditions is 140 ℃ * 30min, obtains goods.
Through performance test, the tensile strength of this electromagnetic shielding native rubber composite material is 14MPa, and under the condition of 10K~18GHz, electromagnet shield effect is 62.3~75.6dB.
Embodiment 2
Chopped carbon fiber is fully disperseed in hollander, and dispersion liquid carries out suction filtration and thorough drying, obtains weak point and cuts dispersive carbon fiber monofilament, and Fibre diameter is 6 μ m, and its length is 3mm; In Banbury mixer or mill, 5min plasticates 100 parts by weight of natural rubber earlier, add 2 parts of stearic acid, 5 parts of zinc oxide, 1 part of anti-aging agent, 60 parts of carbon blacks, 7 parts of chopped carbon fibers, 3 parts of paraffin oils, 1 part of promotor and 2.5 parts of sulphur then by weight successively, carry out mixing 8min again, mixing even back compressing tablet obtains rubber unvulcanizate; Rubber unvulcanizate was at room temperature parked 24 hours, sulfidization molding on the 50T vulcanizing press then, cure conditions is 140 ℃ * 30min, obtains goods.
Through performance test, the tensile strength of this electromagnetic shielding native rubber composite material is 15MPa, and under the condition of 10K~18GHz, electromagnet shield effect is 68.2~82.4dB.
Embodiment 3
Chopped carbon fiber is fully disperseed in hollander, and dispersion liquid carries out suction filtration and thorough drying, obtains weak point and cuts dispersive carbon fiber monofilament, and Fibre diameter is 10 μ m, and its length is 5mm; In Banbury mixer or mill, 5min plasticates 100 parts by weight of natural rubber earlier, add 2 parts of stearic acid, 5 parts of zinc oxide, 1 part of anti-aging agent, 60 parts of carbon blacks, 11 parts of chopped carbon fibers, 3 parts of paraffin oils, 1 part of promotor and 2.5 parts of sulphur then by weight successively, carry out mixing 8min again, mixing even back compressing tablet obtains rubber unvulcanizate; Rubber unvulcanizate was at room temperature parked 24 hours, sulfidization molding on the 50T vulcanizing press then, cure conditions is 140 ℃ * 30min, obtains goods.
Through performance test, the tensile strength of this electromagnetic shielding native rubber composite material is 16MPa, and under the condition of 10K~18GHz, electromagnet shield effect is 72.6~86.6dB.
Claims (5)
1. native rubber composite material with capability of electromagnetic shielding, it is characterized in that this matrix material comprises natural rubber, chopped carbon fiber and Synergist S-421 95, described chopped carbon fiber diameter is 3~10 μ m, its length is 1~5mm, and the normal temperature weight part proportioning of natural rubber and chopped carbon fiber is: 100: 0.5~11.
2. a kind of native rubber composite material with capability of electromagnetic shielding according to claim 1, the thickness that it is characterized in that native rubber composite material is 0.5mm~15mm.
3. a kind of native rubber composite material with capability of electromagnetic shielding according to claim 1 is characterized in that described other Synergist S-421 95s are stearic acid, zinc oxide, anti-aging agent, carbon black, paraffin oil, promotor and vulcanizing agent.
4. preparation method with native rubber composite material of capability of electromagnetic shielding is characterized in that:
(1) chopped carbon fiber is fully disperseed in hollander, dispersion liquid carries out suction filtration and thorough drying, becomes short and cuts dispersive carbon fiber monofilament, and its Fibre diameter is 3~10 μ m, and length is 1~5mm;
(2) natural rubber and the chopped carbon fiber ratio according to normal temperature weight part 100: 0.5~11 is equipped with, other Synergist S-421 95 consumption is equipped with according to a conventional method;
(3) in Banbury mixer or mill, will plasticate by the natural rubber that above-mentioned weight part is equipped with earlier, add chopped carbon fiber and other Synergist S-421 95s then and carry out mixingly, mixing even back compressing tablet obtains rubber unvulcanizate, and rubber unvulcanizate was at room temperature parked 24 hours;
(4) be sulfided into the sheet material that thickness is 0.5mm~15mm.
5. a kind of preparation method with native rubber composite material of capability of electromagnetic shielding according to claim 4 is characterized in that described other Synergist S-421 95s are stearic acid, zinc oxide, anti-aging agent, carbon black, paraffin oil, promotor and vulcanizing agent.
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CN104558729A (en) * | 2014-02-21 | 2015-04-29 | 泌阳恒茂服饰制品有限公司 | Production process of heating unit |
CN104592567A (en) * | 2014-02-20 | 2015-05-06 | 泌阳恒茂服饰制品有限公司 | Heat generation body construction method |
CN105086472A (en) * | 2015-09-24 | 2015-11-25 | 中国工程物理研究院核物理与化学研究所 | Carbon-based porous flexible composite wave-absorbing material and preparation method thereof |
CN105400136A (en) * | 2015-11-13 | 2016-03-16 | 太仓荣中机电科技有限公司 | Corrosion-resistance electromagnetic shielding material |
CN105754151A (en) * | 2014-12-16 | 2016-07-13 | 北京橡胶工业研究设计院 | Chopped carbon fiber-containing rubber composition for tire side wall |
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