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Impregnation Resin for Improved Abrasion Resistance of Flexible Cables

IP.com Disclosure Number: IPCOM000094987D
Original Publication Date: 1965-Aug-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Hawkins, CR: AUTHOR

Abstract

Flexing of a cable formed of a plurality of braided metal strands causes internal abrasion of the cable. That is, the adjacent strands of the cable rub together and wear out. This wear problem is solved by impregnating the cable with a flexible resin. This adheres to adjacent strands and reduces internal abrasion when the cable is flexed.

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Impregnation Resin for Improved Abrasion Resistance of Flexible Cables

Flexing of a cable formed of a plurality of braided metal strands causes internal abrasion of the cable. That is, the adjacent strands of the cable rub together and wear out. This wear problem is solved by impregnating the cable with a flexible resin. This adheres to adjacent strands and reduces internal abrasion when the cable is flexed.

After the cable is cleaned, such as by immersion in a cleaning solution, e.g., methylene chloride, it is immersed in a solution of the resin which penetrates between the strands of the cable. Penetration of the cable by the resin is assisted by placing the cable in a vacuum chamber. After leaving the cable in this reduced atmosphere for about five minutes, it is removed and the excess resin wiped from its surface. Then, the resin present in the cable is cured for a time sufficient to remove substantially all the solvent. For example, the resin can be partially cured in sixteen hours at room temperature, full cure taking about five to seven days at room temperature.

A particular useful resin formulation is the following:

Formulation Parts by Wt.

Component A epoxy resin (epoxide equivalent 450-550) 30.0 methyl isobutyl ketone 22.0 SR-82 (silicone resin) 00.2 Component B
VERSAMID* 415 (polyamide) 24.0 butanol 6.0 xylene 17.8 TOTAL 100.0.

Components A and B are mixed and aged for one half to one hour. The resulting formulation has the following physical properties...