CN202181384U - Porous carbon fiber - Google Patents
Porous carbon fiber Download PDFInfo
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- CN202181384U CN202181384U CN2011200103809U CN201120010380U CN202181384U CN 202181384 U CN202181384 U CN 202181384U CN 2011200103809 U CN2011200103809 U CN 2011200103809U CN 201120010380 U CN201120010380 U CN 201120010380U CN 202181384 U CN202181384 U CN 202181384U
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- carbon fiber
- porous carbon
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- small holes
- pore
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Abstract
The utility model relates to a porous carbon fiber which has a loose multi-hole structure and has two hole types: one type of the hole is a large hole with the hole diameter range of 1 to 5 mum, the other type of the hole is a small hole with the hole diameter which is smaller than 1 mum, 70 to 90 percent of the small holes are in a range of 0.2 to 0.5 mum, the volume ratio of the large hole and the small hole is in a range of 6:4 to 7:3. The multi-hole carbon fiber has 0.2 to 0.7cm3/g of hole capacity integrally and 100 to 1000 S/cm of electric conductivity.
Description
Technical field
The utility model relates to a kind of porous carbon fiber, specifically, relates to a kind of porous carbon fiber of the large and small hole that distributes in proportion.
Background technology
Porous carbon fiber is used to make sorbing material and carbon electrode material because have abundant central hole structure and very high specific area more, but less to the exploitation of its absorbing property.In fact, current material with carbon element as wave absorbing agent mainly is a carbon black, and the successful case that carbon fibre material is used is less relatively, and this is because the common carbon fibers electrical conductivity is higher, to electromagnetic wave have as the metal than strong reflection; Even if when absorbing electromagnetic wave, can show anisotropy because of its morphology factor through long carbon fiber after the improvement, its paving mode and electromagnetic wave incident angle have very big influence to the suction ripple usefulness of its composite.Therefore, there is the researcher to attempt improving the anisotropic shortcoming of long carbon fiber Wave suction composite material through chopped carbon fiber (CN 1730555) or carbon nano-fiber (CN 101412839A).But from improving the wave-absorbing effect of material with carbon element, adopt porous carbon fiber should have more competitiveness,, improve the absorption loss probability because its abundant central hole structure and high-specific surface area will induce electromagnetic wave in inhaling the ripple medium, to propagate repeatedly as wave absorbing agent.
Document (Journal of Inorganic Materials; 2008; 23 (3), 481-485) proposed a kind of preparation method of hollow porous carbon fiber, but its carbon matrix precursor polypropylene fibre is doughnut before carbonization; It is mesoporous also to be that the wet method polypropylene produces in the wet spinning forming process, and its pore space structure mainly is in order to reduce the weight of wave absorbing agent.Document (Carbon, 1997,35:1031-1033) introduced the method that is equipped with the mesoporous carbon fiber with the co-blended spinning legal system; But usefulness is that phenolic aldehyde is a melt spinning method as carbon matrix precursor and employing in fact; But the phenolic aldehyde carbon yield is high, be unfavorable for that hole forms, and mesoporous aperture is about tens nanometer; Differ too much with the radar wave wavelength, be unfavorable for inhaling ripple.The other patent of carbon fiber (CN101314129) provides the method for the carrier-free ormolu catalyst of preparation porous carbon fiber, is floating catalytic (CVD) method but wherein the preparation of porous carbon fiber adopts.
Summary of the invention
The purpose of the utility model provides a kind of porous carbon fiber, specifically, provides a kind of porous carbon fiber of the large and small hole that distributes in proportion.Its preparation principle be with PAN for becoming the carbon matrix precursor polymer, polymethyl methacrylate (PMMA) is the thermal decomposition polymer; PAN and PMMA are through solution blending, wet spinning moulding; The PAN/PMMA blended fiber is at high temperature handled and is removed that thermal decomposition polymer P MMA forms the cavity and carbonization obtains porous carbon fiber.Its preparation main points are rationally to control the composition of PAN and PMMA in the blended fiber, make PAN become continuous phase, and PMMA become decentralized photo: the mesoporous size of final porous carbon fiber and distributing is controlled by the dispersed phase morphology of PMMA.The porous carbon fiber that the utility model proposes can be controlled through the phase morphology of control forerunner composite fibre because of its meso-hole structure, has mesoporous abundant, form is various and pore size distribution range is wide characteristics, is a kind of porous carbon fiber preparation method of novelty.The porous carbon fiber of method preparation according to this; Obtain fine fiber product through grinding again; Be used as the anisotropy that wave absorbing agent can overcome the long filament wave absorbing carbon fiber on the one hand, its loose structure can improve electromagnetic reflection loss probability and reduce material weight on the other hand.
A kind of porous carbon fiber of the utility model, described porous carbon fiber are loose and porous structure, and pore morphology mainly is divided into two kinds: a kind of be stay after the pyrolysis of polymethyl methacrylate decentralized photo than macroscopic void, its pore diameter range is 1～5 μ m; Another kind of be that the cracking component overflow to form in the carbonisation than small holes, the aperture is less than 1 μ m, 70～90% quantity be in the scope of 0.2～0.5 μ m than the small holes aperture, than macroscopic void and than small holes by volume 6: 4～7: 3 scope; Whole pore volume is 0.2～0.7cm
3/ g, electrical conductivity is 100～1000S/cm.
As optimized technical scheme:
Aforesaid a kind of porous carbon fiber, described porous carbon fiber are the particle of particle diameter in 10～100 mu m ranges.Beneficial effect
Employing with PAN be contain carbon matrix precursor, PMMA is the co-blended spinning-high temperature cabonization prepared porous carbon fiber of thermal cracking component, the on the one hand pore volume of carbon fiber, mesoporous size and distribute and can control through PMMA dispersed phase morphology in the control precursor; Can adopt relatively low carburizing temperature (the too high gained carbon fiber and graphite of temperature degree is high, and the reflection enhancement of microwave is unfavorable for absorbing) on the other hand.Adopting above-mentioned porous carbon fiber is that microwave absorption prepares Wave suction composite material, can overcome the anisotropy of long filament wave absorbing carbon fiber on the one hand, and its loose structure can improve electromagnetic reflection loss probability and reduce material weight on the other hand.Prepare at absorbing material and to add coupling agent in the process, can improve the interface adhesion property of porous carbon fiber and matrix; Add antifoaming agent, can effectively lower the content of material hollow bubble; Thereby guarantee that composite still has enough mechanical properties under the situation that adds wave absorbing agent.Be easy to get and employed raw material is all inexpensive in the whole process flow, operation technique is easy, helps reducing production costs obtaining good result of use simultaneously.
Description of drawings
Accompanying drawing is the electron micrograph of the porous carbon fiber that adopts in the utility model
The specific embodiment
Below in conjunction with the specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used to the present invention is described and be not used in the restriction scope of the present invention.Should be understood that in addition those skilled in the art can do various changes or modification to the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
A kind of porous carbon fiber of the utility model, shown in accompanying drawing, described porous carbon fiber is a loose and porous structure, pore morphology mainly is divided into two kinds: a kind of be stay after the pyrolysis of polymethyl methacrylate decentralized photo than macroscopic void, its pore diameter range is 1～5 μ m; Another kind of be that the cracking component overflow to form in the carbonisation than small holes, the aperture is less than 1 μ m, 70～90% quantity be in the scope of 0.2～0.5 μ m than the small holes aperture; Than macroscopic void and than small holes by volume 6: 4～7: 3 scope, whole pore volume is 0.2～0.7cm
3/ g, electrical conductivity is 100～1000S/cm.
Wherein, described porous carbon fiber is the particle of particle diameter in 10～100 mu m ranges.
Claims (2)
1. porous carbon fiber, it is characterized in that: described porous carbon fiber is a loose and porous structure, and pore morphology mainly is divided into two kinds: a kind of is than macroscopic void, and its pore diameter range is 1～5 μ m; Another kind of is than small holes, and the aperture is less than 1 μ m, 70～90% quantity be in the scope of 0.2～0.5 μ m than the small holes aperture, than macroscopic void and than small holes by volume 6: 4～7: 3 scope; The whole pore volume of described porous carbon fiber is 0.2～0.7cm
3/ g, electrical conductivity is 100～1000S/cm.
2. a kind of porous carbon fiber according to claim 1 is characterized in that, described porous carbon fiber is the particle of particle diameter in 10～100 mu m ranges.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200103809U CN202181384U (en) | 2011-01-14 | 2011-01-14 | Porous carbon fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200103809U CN202181384U (en) | 2011-01-14 | 2011-01-14 | Porous carbon fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202181384U true CN202181384U (en) | 2012-04-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200103809U Expired - Fee Related CN202181384U (en) | 2011-01-14 | 2011-01-14 | Porous carbon fiber |
Country Status (1)
| Country | Link |
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| CN (1) | CN202181384U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104466140A (en) * | 2014-12-31 | 2015-03-25 | 南开大学 | Method for preparing nano tin/carbon composite nanofibers through electrospinning technology |
| CN109183421A (en) * | 2018-09-20 | 2019-01-11 | 吕莉 | A kind of preparation method of automatically cleaning plastic carpet |
-
2011
- 2011-01-14 CN CN2011200103809U patent/CN202181384U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104466140A (en) * | 2014-12-31 | 2015-03-25 | 南开大学 | Method for preparing nano tin/carbon composite nanofibers through electrospinning technology |
| CN104466140B (en) * | 2014-12-31 | 2017-02-01 | 南开大学 | Method for preparing nano tin/carbon composite nanofibers through electrospinning technology |
| CN109183421A (en) * | 2018-09-20 | 2019-01-11 | 吕莉 | A kind of preparation method of automatically cleaning plastic carpet |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120404 Termination date: 20140114 |