Carbon fiber paper, flexible rollable carbon paper made from the carbon fiber base paper and the preparation methods and systems thereof
AssigneeShanghai Jazz New Material Technology Co., Ltd.
InventorXuefeng Lu
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Abstract
The present application discloses a flexible rollable carbon paper, and the carbon paper has a thickness of 0.15˜0.25 mm, a volume density of 0.20˜0.45 g/cm3, and a porosity of 70˜90%; a flexible strength of 2060 Mpa, and a bending degree of 60˜180°; a surface resistivity ≤100 mΩ-cm; and a thermal conductivity ≥0.8 W/(m·K). The present application also discloses the processing technology and related processing systems of the paper and its intermediates.
Claims13
A flexible rollable carbon paper, characterized in that the carbon paper has a thickness of 0.15˜0.25 mm, a volume density of 0.20˜0.45 g/cm3, and a porosity of 70˜90%;
- a flexible strength of 20˜60 Mpa, and a bending degree of 60˜180°;
- a surface resistivity ≤100 mΩ·cm;
- and a thermal conductivity ≥0.8 W(m·K);
- the method for preparing the same is composed of the following steps:
- step 1:
- performing carbon fiber matching;
- step 2:
- preparing carbon fiber non-woven paper sheets by non-woven technology;
- step 3:
- laminating the surface of multiple carbon fiber non-woven paper sheets to form a carbon fiber paper;
- and
- step 4:
- producing the flexible rollable carbon paper by continuous heat treatment
- wherein the process of surface lamination in step 3 is as follows:
- laminate a layer of thermoplastic resin film (A) and a carbon fiber non-woven paper sheet (B), and then heat press them using an automatic laminating machine at 100˜220° C. to form carbon fiber paper;
- wherein the carbon fiber matching in step 1 includes short-cutting the carbon fiber into long fibers of 25˜100 mm and short fibers of 1˜20 mm, controlling the mass ratio of long fibers and short fibers at 3:1˜1:3,
- wherein the method of preparing the carbon fiber non-woven paper sheets in step 2 comprises the following steps:
- step 2.1:
- opening the long and short carbon fibers separately to disperse them into single ones;
- and
- step 2.2:
- bringing the opened long and short fibers into the blender through the airflow fiber conveyor at the same time, mix the long and short fibers through the airflow, and subsequently introduce them into the airflow carding machine for further carding of the carbon fibers to form the carbon fiber non-woven paper sheets by the web formation technology;
- wherein the airflow fiber conveyor and the airflow carding machine in step 2.2 use compressed air as the medium, the gas flow rate of the airflow fiber conveyor for long fibers is 25˜45 m/s, the gas flow rate of the airflow fiber conveyor for short fibers is 5˜20 m/s, and the gas flow rate of the airflow carding machine is 15˜35 m/s;
- wherein the carbon fiber non-woven paper sheet in step 2 has a surface density of 5 to 40 g/m2.
2-4. (canceled)
The method of claim 36, wherein the long and short fiber carbon fibers are opened separately using a double-roller fiber opener, with the air used as the dispersing medium, depending on a high-speed rotary roller.
8-10. (canceled)
The method of claim 36, wherein the process of continuous heat treatment in step 4 is as follows:
- carbonize for 30˜180 min under the protection of nitrogen at 600 to 1100° C., followed by heat treatment for 30˜180 min under the protection of argon at 1400˜1800° C.
The method of claim 36, wherein the thermoplastic resin film is one or more of the following materials:
- thermoplastic phenolic resin film, epoxy resin film, polyethylene film, and polypropylene film;
- the resin film has a thickness of 0.01˜0.1 mm.
The method of claim 36, wherein the lamination involves a total of 3˜12 layers and the lamination is composed of a layer of thermoplastic resin film (A), a carbon fiber non-woven sheet (B), and a layer of thermoplastic resin film (A) in the form of (ABA), (ABABABA), (ABABABA), (ABABABABA), (ABABABABA), or (ABABABABABA) in turn circularly.
The method of claim 36, wherein:
- the lamination involves a total of 3˜12 layers the lamination is composed of a layer of thermoplastic resin film (A), a carbon fiber non-woven paper sheet (B), two layers of thermoplastic resin film (AA), a carbon fiber non-woven paper sheet (B), and a layer of thermoplastic resin film (A) in the form of (ABAABA), (ABAABAABA), or (ABAABAABAABA).
15-34. (canceled)
A method for preparing a flexible rollable carbon paper is composed of the following steps:
- step 1:
- performing carbon fiber matching;
- step 2:
- preparing carbon fiber non-woven paper sheets by non-woven technology;
- step 3:
- laminating the surface of multiple carbon fiber non-woven paper sheets to form a carbon fiber paper;
- and
- step 4:
- producing the flexible rollable carbon paper by continuous heat treatment;
- wherein the process of surface lamination in step 3 is as follows:
- laminate a layer of thermoplastic resin film (A) and a carbon fiber non-woven paper sheet (B), and then heat press them using an automatic laminating machine at 100˜220° C. to form carbon fiber paper;
- wherein the carbon fiber matching in step 1 includes short cutting the carbon fiber into long fibers of 25˜100 mm and short fibers of 1˜20 mm, controlling the mass ratio of long fibers and short fibers at 3:1˜1:3;
- wherein the method of preparing the carbon fiber non-woven paper sheets in step 2 comprises the following steps:
- step 2.1:
- opening the long and short carbon fibers separately to disperse them into single ones;
- and
- step 2.2:
- bringing the opened long and short fibers into the blender through the airflow fiber conveyor at the same time, mix the long and short fibers through the airflow, and subsequently introduce them into the airflow carding machine for further carding of the carbon fibers to form the carbon fiber non-woven paper sheets by the web formation technology;
- wherein the airflow fiber conveyor and the airflow carding machine in step 2.2 use compressed air as the medium, the gas flow rate of the airflow fiber conveyor for long fibers is 25˜45 m/s, the gas flow rate of the airflow fiber conveyor for short fibers is 5˜20 m/s, and the gas flow rate of the airflow carding machine is 15˜35 m/s;
- wherein the carbon fiber non-woven paper sheet in step 2 has a surface density of 5 to 40 g/m2.
Dependencies are inferred from the claim text.