AU2021104826A4 - Method for making wood-converted carbon fiber paper - Google Patents
Method for making wood-converted carbon fiber paper Download PDFInfo
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- AU2021104826A4 AU2021104826A4 AU2021104826A AU2021104826A AU2021104826A4 AU 2021104826 A4 AU2021104826 A4 AU 2021104826A4 AU 2021104826 A AU2021104826 A AU 2021104826A AU 2021104826 A AU2021104826 A AU 2021104826A AU 2021104826 A4 AU2021104826 A4 AU 2021104826A4
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- wood
- fiber paper
- carbon fiber
- paper
- pulp
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- 238000000034 method Methods 0.000 title claims abstract description 75
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 55
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 55
- 239000002023 wood Substances 0.000 claims abstract description 32
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000002243 precursor Substances 0.000 claims abstract description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 239000000835 fiber Substances 0.000 claims description 25
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 238000010009 beating Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000001354 calcination Methods 0.000 claims description 7
- 241000218652 Larix Species 0.000 claims description 5
- 235000005590 Larix decidua Nutrition 0.000 claims description 5
- 241000218631 Coniferophyta Species 0.000 claims description 4
- 238000012216 screening Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 206010061592 cardiac fibrillation Diseases 0.000 claims description 3
- 238000010411 cooking Methods 0.000 claims description 3
- 230000002600 fibrillogenic effect Effects 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 239000003575 carbonaceous material Substances 0.000 abstract description 9
- 239000002028 Biomass Substances 0.000 abstract description 6
- 238000003763 carbonization Methods 0.000 abstract description 6
- 239000002994 raw material Substances 0.000 abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 19
- 229910052799 carbon Inorganic materials 0.000 description 9
- 239000002041 carbon nanotube Substances 0.000 description 9
- 229910021393 carbon nanotube Inorganic materials 0.000 description 9
- 239000000446 fuel Substances 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- 239000008367 deionised water Substances 0.000 description 5
- 229910021641 deionized water Inorganic materials 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 241000219000 Populus Species 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 239000011152 fibreglass Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000001376 precipitating effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 238000010960 commercial process Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002296 pyrolytic carbon Substances 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F9/00—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments
- D01F9/08—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments of inorganic material
- D01F9/12—Carbon filaments; Apparatus specially adapted for the manufacture thereof
- D01F9/14—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments
- D01F9/16—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments from products of vegetable origin or derivatives thereof, e.g. from cellulose acetate
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C1/00—Pretreatment of the finely-divided materials before digesting
- D21C1/06—Pretreatment of the finely-divided materials before digesting with alkaline reacting compounds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/02—Methods of beating; Beaters of the Hollander type
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Paper (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
OF THE DISCLOSURE
The present disclosure specifically relates to a method for making wood-converted carbon fiber
paper. According to the method for making wood-converted carbon fiber paper, wood is used as a
precursor and subjected to a conventional papermaking process, the wood is cooked into a stock; the
stock is washed, screened, and beaten into a pulp; finally, the pulp is subjected to a papermaking
process to obtain a paper; the paper is calcinated at a high temperature under a preotection of nitrogen,
to obtain a carbon material. As the wood is of an amorphous structure microstructurally, a conversion
from an amorphous structure to a fibrous structure is achieved through the papermaking process, and
a wood-converted carbon fiber paper is then obtained through carbonization. According to the method
for making a wood-converted carbon fiber paper, wood that has rich resources is used as a raw
material; the method has advantage of energy saving and consumption reduction; by means of a
complete papermaking process and a simple carbonization method, a stable carbon fiber paper could
be obtained efficiently, and research on controllable biomass energy morphology and biomass-based
carbon material application are widened.
9
FIGURE 1
1
Description
FIGURE 1
[01] The present disclosure relates to the technical field of carbon fiber, and in particular to a method for making a wood-converted carbon fiber paper.
[02] Carbon fiber material has a certain perspectiveness and broad application prospects. The material is usually a kind of new material which exists in the form offiber and has high surface area, excellent corrosion resistance and electric and thermal conductivity. Therefore, researchers have been committed to the study of carbon fiber, and have successfully prepared different carbon fibers using different raw materials and different methods. So far, stable carbon fibers are mainly prepared by forming a fiber form by means of spinning, and then calcinating. Meanwhile, during the preparation of carbon fiber, different precursors for preparation further determine the properties of the carbon fiber. Generally, carbon fibers prepared by polymers are relatively stable; however, polymers are expensive and could pollute the environment. Therefore, it is always a challenging research topic to select a biomass material and control the morphology of the carbon fiber simultaneously.
[03] As one of the four great inventions of ancient China, papermaking has a long history and is a traditional craftsmanship. The papermaking has a certain status and role in the national economy. The obtained paper has the advantages of strong adsorption capacity and controllable flexibility. Meanwhile, an amorphous microstructure of wood could be converted into a microfibrous structure by a papermaking process. Also, the papermaking process is inexpensive and efficient, which has exhibited more superior performance in many applications and has become a mature conventional commercial process. In addition, calcination method is the simplest process for obtaining carbon materials that could convert fibers into carbon fibers simply and efficiently. Due to the advantages such as abundant resources, sufficient and guaranteed output, low cost of raw materials, and energy saving and consumption reduction, wood has important practical significance and application value when selecting wood as a template and efficiently making carbon fiber paper by means of a simple and practical method.
[04] A European patent (EP1009048) discloses a method for making carbon fiber paper for a fuel cell. The carbon fiber paper is mainly made by mixing a graphite structure with a conductive structure and is applied to a fuel cell. This method requires relatively complicated making conditions and has certain application limitations.
[05] A Japanese patent (W02003087470) discloses a method for preparing a fuel cell by combining carbon fibers and porous carbon. This method relates to a combine reaction, which improves the performance of a fuel cell by further hybrid combination. The fuel cell has an excellent performance, but with high cost and uneven mixing. Therefore, it is necessary to develop a cost effective, uniformly-mixed and efficient method.
[06] A Korean patent (KR20140092154) discloses a method for manufacturing carbon fiber paper by precipitating a PAN fibrid, and relates to the field of carbon fibers. The carbon fiber paper formed by precipitating the PAN fibrid has large porosity, and paper strength and improved elastic coefficient. This method has important research significance, and has complex manufacturing conditions, high cost, and poor controllability.
[07] Chinese patent publication No. CN204034427U discloses an activated carbon fiber paper special for a water treatment filter element. This utility model discloses an activated carbon fiber paper special for a water treatment filter element, which is characterized by comprising short activated carbon fiber and a felt made from fiberglass by an air laid technology, wherein the felt has a grammage of 100 10 g/m 2 , and the short activated carbon fiber is adsorbed onto the fiberglass through an adhesive. The activated carbon fiber paper in the utility model has the characteristics of acid resistance, alkali resistance, high temperature resistance, and high strength. The activated carbon fiber paper could not only block suspended matters and solid particles in water, but also could adsorb organic substances and heavy metal ions. The filtering accuracy of the activated carbon fiber paper could reach above 0.5 micron. The activated carbon fiber paper could be widely used in fields such as wastewater treatment and organic waste liquid purification. However, this method is complicated to operate and cost. Therefore, it is necessary to develop a simple making method.
[08] Chinese patent publication No. CN1598141 discloses a carbon fiber paper and a making method thereof. The method comprises the following steps: putting a mixture of a dispersant, a primary binding agent and carbon fiber into water, and beating to obtain a suspension; subjecting the suspension to a papermaking by a conventional wet papermaking process; impregnating the resulting paper in a secondary binding agent solution; subjecting the impregnated carbon paper to a drying and a carbonization. This application has advantages that the preparation process is simple, and the obtained carbon fiber paper has low resistivity and high intensity, which could realize industrialized production This prepared process is simple and the obtained samples could be recycled. However, the breakthroughs of the dispersibility of carbon fibers, the bonding capacity of papers, and the specific surface area remain to be studied further.
[09] Chinese patent publication No. CN102146641A discloses a process for manufacturing modified carbon fiber paper by adopting a carbon nanotube implanting method. This process comprises the following steps: dispersing a prepared or commercial carbon nanotube, uniformly coating the dispersed carbon nanotube onto the surface of a carbon paper prepared by a conventional method using a phenolic resin solution as an adhesive, during which the carbon nanotube is bonded on the carbon paper, and due to a'pinning function', the carbon nanotube will be perpendicular to the surface of the carbon paper attached; subjecting the resulting carbon paper to a carbonization; finally, tightly fixing the carbon nanotube on the surface of the carbon paper by depositing pyrolytic carbon with a chemical gas phase deposition method. According to this application, by this method, carbon nanotubes could be implanted into the surface of the carbon paper in a large area on a large scale. The method not only has the advantages of low cost and simple operation, but also makes it possible to remarkably increase the adhesion of the carbon nanotubes on the surface of the carbon paper, and thus the carbon nanotubes are not easy to strip, and without introducing other unfavorable elements. However, this method involves steps of coating, bonding and re-carbonization, which makes it involve too many uncontrollable factors. Thus, it is necessary to simplify this method.
[10] Chinese patent publication No. CN1598142 discloses a carbon fiber paper and a making method thereof. According to the method, a mixture of a dispersant, a cellulose slurry, and carbon fiber is beaten into a suspension, the suspension is subjected to a papermaking by the conventional wet method papermaking technology; the paper is impregnated in an inorganic catalyst solution and then impregnated in a binding agent solution; the impregnated paper is dried and carbonized. According to this application, the carbon fiber paper has the advantages of low resistivity, high conductivity, high intensity, and its preparation method is simple. This method has advantages of simple operation, short cycle, high synthesis efficiency, excellent repeatability, environmental friendliness, and no environmental pollution, and is applied in the fields of fuel cell catalysts and conductive materials. However, this method has low synthesis efficiency and fair reproducibility, and needs to consider bonding strength and other factors. It is necessary to develope a carbon fiber material that could be prepared by a more simple and direct method.
[11] In summary, attention has been focused on the preparation of carbon fiber paper by subjecting common woody biomass as a precursor to the papermaking technology and calcination process due to simple preparation process, time saving and energy conservation, high efficiency, and easy industrialization. Based on this, the present disclosure provides a method for making wood-converted carbon fiber paper, in which a plurality of common woods are selected as precursors, a kind of wood converted carbon fiber paper is made simply and efficiently after a simple papermaking process and a calcination at different temperatures for different time.
[12] To overcome the defects in the prior art, the present disclosure provides a method for making wood-converted carbon fiber paper, which is easy to implement, and is flexible and efficient.
[13] The present disclosure is achieved by the following technical solution:
[14] A method for making a wood-converted carbon fiber paper, including:
[15] step 1, using wood as a precursor, cooking the wood through a conventional papermaking process to obtain a stock;
[16] step 2, washing, screening, and beating the stock to obtain a pulp, and subjecting the pulp to a papermaking process on a handsheet former, to form a fiber paper, which realizes a conversion of wood microstructure from an amorphous structure to a fibrous structure; and
[17] step 3, calcinating the fiber paper at a high temperature under the protection of nitrogen to obtain the wood-converted carbon fiber paper.
[18] In some embodiments, step 1 is conducted as follows: conifer or larch may be used as a precursor, and wood chips thereof may be subjected to a conventional papermaking process, specifically cooked in a sodium hydroxide solution with a concentration of 12-18 wt% at 150-180 °C for 2-4 h, to obtain a stock.
[19] In some embodiments, step 2 is conducted as follows: the stock may be washed with clean water to pH 7, screened by a pulp screening to remove unpulped solid wood residues, and then to a fibrillation by beating, to obtain a pulp with a beating degree of 20-60 °SR; the pulp is subjected to a papermaking process on a handsheet former to obtain a fiber paper with a paper grammage of 30-120 g/m 2 .
[20] In some embodiments, step 3 is conducted as follows: the fiber paper may be dried at 80 100 °C and then calcinated at 700-900 °C for 2-3 h under a protection of nitrogen to obtain a carbon fiber paper.
[21] The present disclosure has the following beneficial effects:
[22] In the method for making a wood-converted carbon fiber paper, wood that has rich resources is used as a raw material; the method has advantage of energy saving and consumption reduction; by means of a complete papermaking process and a simple carbonization method, a stable carbon fiber paper may be obtained efficiently, and research on controllable biomass energy morphology and biomass-based carbon material application may be widened.
[23] The present disclosure will be further described with reference to the accompanying drawings.
[24] FIGURE shows a scanning electron microscope (SEM) image of coniferous wood-converted carbon fiber paper according to the present disclosure.
[25] To make the technical problems to be solved, technical solutions, and beneficial effects of the present disclosure clearer and easier to be understood, the present disclosure will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that the specific embodiments described herein are only intended to explain the present disclosure, and are not intended to limit the present disclosure.
[26] A method for making a wood-converted carbon fiber paper, including the following steps:
[27] step 1, using wood as a precursor, cooking the wood through a conventional papermaking process to obtain a stock;
[28] step 2, washing, screening, and beating the stock to obtain a pulp, and subjecting the pulp to a papermaking process on a handsheet former to obtain a fiber paper, which realizes a conversion of wood microstructure from an amorphous structure to a fibrous structure; and
[29] step 3, calcinating the fiber paper at a high temperature under a protection of nitrogen to obtain the wood-converted carbon fiber paper.
[30] In some embodiments, step 1 is conducted as follows: conifer or larch may be used as a precursor, and wood chips thereof may be subjected to a conventional papermaking process, specifically cooked in a sodium hydroxide solution with a concentration of 12-18 wt% at 150-180 °C for 2-4 h to obtain a stock.
[31] In some embodiments, step 2 is conducted as follows: the stock may be washed with clean water to pH 7, screened by a pulp screen to remove unpulped solid wood residues, and to a fibrillation by beating, to obtain a pulp with a beating degree of 20-60 °SR; the pulp is subjected to a papermaking 2 process on a handsheet former to obtain a fiber paper with a paper grammage of 30-120 g/m .
[32] In some embodiments, step 3 is conducted as follows: the fiber paper may be dried at 80 100 °C, and then calcinated at 700-900 °C for 2-3 h under a protection of nitrogen, to obtain a carbon fiber paper.
[33] Example 1
[34] Conifer was used as a precursor, wood chips thereof were cooked in a sodium hydroxide solution with a concentration of 12% at 180 °C for 4 h, obtaining a stock. The stock was washed with deionized water to pH 7, screened by a pulp screen, and beaten into a pulp with a beating degree of °SR. Finally, the pulp was subjected to a papermaking process on a handsheet former, obtaining a fiber paper with a paper grammage of 120 g/m 2 . The fiber paper was dried at 90 °C, and then calcinated at 700 °C for 2 h under a protection of nitrogen, obtaining a carbon material, i.e., a wood converted carbon fiber paper. A SEM image of the carbon fiber paper obtained is shown in FIG. 1.
[35] Example 2
[36] Larch was used as a precursor, wood chips thereof were cooked in a sodium hydroxide solution with a concentration of 15% at 160 °C for 3 h, obtaining a stock. The stock was washed with deionized water to pH 7, screened by a pulp screen, and beaten into a pulp with a beating degree of °SR. Finally, the pulp was subjected to a papermaking process on a handsheet former, obtaining a fiber paper with a paper grammage of 100 g/m2 . The fiber paper was dried at 80 °C, and then calcinated at 800 °C for 2 h under a protection of nitrogen, obtaining a carbon material, i.e., a wood converted carbon fiber paper.
[37] Example 3
[38] Larch was used as a precursor, wood chips thereof were cooked in a sodium hydroxide solution with a concentration of 18% at 150 °C for 2 h, obtaining a stock. The stock was washed with deionized water to pH 7, screened by a pulp screen, and beaten into a pulp with a beating degree of °SR. Finally, the pulp was subjected to a papermaking process on a handsheet former, obtaining a fiber paper with a paper grammage of 80 g/m 2 . The fiber paper was dried at 100 °C, and then calcinated at 900 °C for 2 h under a protection of nitrogen, obtaining a carbon material, i.e., a wood converted carbon fiber paper.
[39] Example 4
[40] Poplar was used as a precursor, wood chips thereof were cooked in a sodium hydroxide solution with a concentration of 16% at 170 °C for 4 h, obtaining a stock. The stock was washed with deionized water to pH 7, screened by a pulp screen, and beaten into a pulp with a beating degree of °SR. Finally, the pulp was subjected to a papermaking process on a handsheet former, obtaining a fiber paper with a paper grammage of 30 g/m 2 . The fiber paper was dried at 95 °C, and then calcinated at 800 °C for 3 h under a protection of nitrogen, obtaining a carbon material, i.e., a wood-converted carbon fiber paper.
[41] Example 5
[42] Poplar was used as a precursor, wood chips thereof were cooked in a sodium hydroxide solution with a concentration of 14% at 165 °C for 3.5 h, obtaining a stock. The stock was washed with deionized water to pH 7, screened by a pulp screen, and beaten into a pulp with a beating degree of 30 °SR. Finally, the pulp was subjeted to a papermaking process on a handsheet former, obtaining a fiber paper with a paper grammage of 50 g/m 2 . The fiber paper was dried at 85 °C, and calcinated at 900 °C for 3 h under a protection of nitrogen, obtaining a carbon material, i.e., a wood-converted carbon fiber paper.
Claims (4)
1. A method for making a wood-converted carbon fiber paper, comprising the following steps:
step 1, using wood as a precursor, cooking the wood to obtain a stock via a conventional papermaking process;
step 2, washing, screening, and beating the stock to obtain a pulp, and subjecting the pulp to a papermaking process on a handsheet former, to obtain a fiber paper, which realizes a conversion of wood microstructure from an amorphous structure to a fibrous structure; and
step 3, drying the fiber paper and calcinating the dried fiber paper at a high temperature under a protection of nitrogen to obtain the wood-converted carbon fiber paper.
2. The method of claim 1, wherein step 1 is conduted as follows: conifer or larch is used as a precursor, and wood chips thereof are subjected to a conventional papermaking process, specifically cooked in a sodium hydroxide solution with a concentration of 12-18 wt% at 150-180 °C for 2-4 h to obtain a stock.
3. The method of claim 1, wherein step 2 is conducted as follows: the stock is washed with clean water to pH 7, screened by a pulp screen to remove unpulped solid wood residues, and to a fibrillation by beating, to obtain a pulp with a beating degree of 20-60 °SR, and the pulp is subjected to a papermaking process on a handsheet former to obtain a fiber paper with a paper grammage of 30-120 g/m 2 .
4. The method of claim 1, wherein step 3 is conducted as follows: the fiber paper is dried at 80 100 °C and then calcinated at 700-900 °C for 2-3 h under a protection of nitrogen, to obtain a carbon fiber paper.
－1/1－
FIGURE 1
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| AU2021104826A AU2021104826A4 (en) | 2021-08-02 | 2021-08-02 | Method for making wood-converted carbon fiber paper |
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| AU2021104826A AU2021104826A4 (en) | 2021-08-02 | 2021-08-02 | Method for making wood-converted carbon fiber paper |
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