Electroconductive aramid paper

Inactive Publication Date: 2006-11-30
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011] This invention relates to aramid paper comprising 5 to 65 parts by weight aramid fiber, 30-90 parts by weight aramid fibrids, and 1-20 parts by weight of conductive fille

Problems solved by technology

However, it has been found that this paper does not have adequate tensile strength for automated tape winding of conductors, resulting in breakage and tearing of aramid tapes when wrapped using the under the tensions normally used by automatic winding devices.
The hot calendered version of this paper has an improved tensile strength of about 35 N/cm (a tensile index about 90 N*m/g) and is

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0047] An aqueous dispersion was made of never-dried poly (metaphenylene isophthalamide) (MPD-I) fibrids at a 0.5% consistency (0.5 weight percent solid materials in water). Carbon fiber was added to this dispersion. After about ten minutes of continued agitation, additional water and meta-aramid floc were added with additional agitation of about ten minutes to completely blend the materials and to yield a slurry having a final consistency of 0.35%. The final slurry was comprised of the following solids by weight: 39% MPD-I floc, 50% MPD-I fibrids, and 11% carbon fiber.

[0048] The MPD-I fibrids were made using the general method as disclosed and described in U.S. Pat. No. 3,756,908. The MPD-I floc had a linear density of 0.22 tex (2.0 denier), a cut length of 0.64 cm, and an initial modulus of about 800 cN / tex (sold by DuPont under the trade name NOMEX®). The carbon fiber was FORTAFIL fiber type 150 (length of 0.32 cm), available from FORTAFIL Inc.

[0049] The slurry was pumped to a ...

example 2

[0050] A slurry was prepared as in Example 1, however the final slurry was comprised of the following solids by weight: 40% MPD-I floc, 50% MPD-I fibrids, and 10% carbon fiber. A paper with a basis weight of 50.2 g / m2 was formed on a Fourdrinier and additionally heat-treated as in Example 1. A 2 cm wide tape from this paper was successfully wrapped without breakage or tearing on a coil using an automated winding process.

example 3

[0051] A slurry was prepared as in Example 1, however the final slurry was comprised of the following solids by weight: 44% MPD-I floc, 50% MPD-I fibrids, and 6% carbon fiber. A paper with a basis weight of 53.9 g / m2 was formed on a Fourdrinier and additionally heat-treated as in Example 1. A 2 cm wide tape from this paper was successfully wrapped without breakage or tearing on a coil using an automated winding process.

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Abstract

This invention relates to aramid papers, and a process for making such papers, the papers comprising 5 to 65 parts by weight aramid fiber, 30-90 parts by weight aramid fibrids, and 1-20 parts by weight of conductive filler, based on the total weight of the aramid fiber, fibrids, and filler; the papers having an apparent density of not more than 0.43 g/cm3 and a tensile index not less than 60 Nm/g.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] This invention relates to electroconductive aramid paper suitable for electrostatic discharge interference and / or electromagnetic interference shielding. [0003] 2. Description of Related Art [0004] NOMEX® Type 843 Conductive Carbon Blend aramid paper consists of NOMEX® brand floc and fibrids blended with conductive carbon fibers. This paper has been available in both hot calendered and uncalendered versions. The uncalendered version of this paper has a basis weight of about 40 g / m2, a density of about 0.29 g / cm3, and a tensile strength of about 16 N / cm, which corresponds to tensile index of 40 N*m / g, and can be easily saturated with polymer resins. However, it has been found that this paper does not have adequate tensile strength for automated tape winding of conductors, resulting in breakage and tearing of aramid tapes when wrapped using the under the tensions normally used by automatic winding devices. The hot cal...

Claims

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Application Information

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IPC IPC(8): D21H13/26D21H13/36
CPCD21H13/50D21H13/26
Inventor LEVIT, MIKHAIL R.
Owner EI DU PONT DE NEMOURS & CO
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