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Microporous PTFE composite carbon nanotube paper and preparation method thereof

A carbon nanotube and PTFE technology, which is applied in the field of microporous PTFE composite carbon nanotube paper and its preparation, can solve the problems of decreased hydrophobicity, inability to directly borrow the pore-making method, low plasticity, etc., and achieves improved elongation at break, The effect of maintaining superhydrophobicity and simple preparation method

Active Publication Date: 2018-10-19
KUNMING NATAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the air permeability and microscopic uniformity of PTFE composite carbon nanotube paper are much lower than those of pure carbon nanotube paper, and even airtight, which limits its application range
The plasticity of composite carbon paper is much lower than that of PTFE film, so the pore-making method of PTFE composite carbon nanotube paper cannot directly borrow the pore-making method of PTFE
At present, the main method to increase air permeability is to use pore-forming agents, which can effectively increase the air permeability of composite materials, but this method will destroy the structural integrity. With the increase of air permeability, the strength, plasticity and toughness of the material will decrease, and also It is determined that the upper limit of its air permeability is not high enough; at the same time, as the inhomogeneity intensifies, the walls of the pores may be carbon nanotubes or polytetrafluoroethylene, resulting in a decrease in its hydrophobicity

Method used

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  • Microporous PTFE composite carbon nanotube paper and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: As shown in Figure 1, this microporous PTFE composite carbon nanotube paper is uniformly compounded by PTFE and carbon nanotubes, and has a network-like cross-overlapping structure, with uniform micropores, and PTFE is evenly distributed on the hole walls, which is super-hydrophobic Pores, thickness 49±3um, air permeability 15.4μm / (Pa•s), elongation at break 126±5%, resistivity 362±24mΩ.cm, static contact angle 139°±9°.

[0024] The preparation method of microporous PTFE composite carbon nanotube paper, the specific preparation steps are as follows:

[0025] (1) Preparation of basic materials: Mix PTFE emulsion and carbon nanotube dispersion evenly, the mass ratio of PTFE and CNTs is 8:1, the micropores are formed by suction filtration with a microporous filter membrane with a pore size of 1 μm; the wool blanket is sandwiched, at 120 Dry at ℃ for 40 minutes, after drying, the carbon paper is separated from the substrate, the carbon paper is sintered, and t...

Embodiment 2

[0030] Example 2: This microporous PTFE composite carbon nanotube paper is uniformly composited by PTFE and carbon nanotubes, and has a network-like cross-overlapping structure, with uniform micropores, PTFE is evenly distributed on the hole walls, and it is a super-hydrophobic hole with a thickness of 57 ± 5um , air permeability 9.5μm / (Pa•s), elongation at break 193±30%, resistivity 297±19mΩ.cm, static contact angle 142°±9°.

[0031] The preparation method of microporous PTFE composite carbon nanotube paper, the specific preparation steps are as follows:

[0032] (1) Preparation of basic materials: Mix PTFE emulsion and carbon nanotube dispersion evenly, the mass ratio of PTFE and CNTs is 3:1, the micropores are formed by suction filtration with a microporous filter membrane with a pore size of 1 μm; the wool blanket is sandwiched, at 120 Dry at ℃ for 40 minutes, after drying, the carbon paper is separated from the substrate, the carbon paper is sintered, and the muffle furna...

Embodiment 3

[0037] Example 3: This microporous PTFE composite carbon nanotube paper is uniformly composited by PTFE and carbon nanotubes, and has a network-like cross-overlapping structure, with uniform micropores, PTFE is evenly distributed on the hole walls, and it is a super-hydrophobic hole, with a thickness of 82 ± 5um , air permeability 2.7μm / (Pa•s), elongation at break 210±45%, resistivity 195±8mΩ.cm, static contact angle 140°±5°.

[0038] The preparation method of microporous PTFE composite carbon nanotube paper, the specific preparation steps are as follows:

[0039](1) Preparation of basic materials: Mix PTFE emulsion and carbon nanotube dispersion evenly, the mass ratio of PTFE and CNTs is 3:1, the micropores are formed by suction filtration with a microporous filter membrane with a pore size of 1 μm; the wool blanket is sandwiched, at 120 Dry at ℃ for 40 minutes, after drying, the carbon paper is separated from the substrate, the carbon paper is sintered, and the muffle furnac...

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Abstract

The invention discloses microporous PTFE composite carbon nanotube paper and a preparation method of the microporous PTFE composite carbon nanotube paper, and belongs to the technical field of papermaking. The microporous PTFE composite carbon nanotube paper is formed by uniformly compounding PTFE and carbon nanotubes, is of a network cross-overlapping structure and has uniform micropores, PTFE isuniformly distributed on pore walls, the micropores are superhydrophobic pores, the maximum air permeability is close to 90 microns / (Pa.S), the maximum elongation at break is up to 400%, the resistivity is not greater than 470 momega.cm, the thickness is not smaller than 32 microns, and the contact angle is greater than 120 degrees. The microporous PTFE composite carbon nanotube paper is preparedby the steps of preparing a base material and a wetting lubricant and performing orientation pretreatment, stretching pore forming and heat treatment. The preparation method disclosed by the invention is simple and easy to realize, and the microporous PTFE composite carbon nanotube paper prepared by the invention well inherits properties of excellent conductivity, self-cleaning ability, interlayer bonding force and the like in the PTFE composite carbon nanotube paper. Furthermore, the microporous PTFE composite carbon nanotube paper is further greatly improved in air permeability and softer.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and in particular relates to a microporous PTFE composite carbon nanotube paper and a preparation method thereof. Background technique [0002] Due to its excellent electrical and mechanical properties and structural characteristics, as well as its nanoscale and light weight, carbon nano-film materials are widely used in energy storage electrodes, catalytic carriers, reinforced composite materials, wave-absorbing and electromagnetic shielding materials, flame-retardant materials, microelectronics and Filtration and other fields have a wide range of uses. [0003] In order to obtain more new properties, the application of carbon nanomaterials is often applied in the form of composite materials, that is, combined with other materials for application. For example: After compounding polytetrafluoroethylene and carbon nanotubes into a film, PTFE composite carbon nanotube paper is obtained, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H17/35D21H17/67B29D7/01
CPCB29D7/01D21H17/35D21H17/67
Inventor 尹显密吕秀梅肖辉刘铸
Owner KUNMING NATAI TECH CO LTD
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