Browse Prior Art Database

Gel Time Measurement Device for Epoxies and Similar Polymers

IP.com Disclosure Number: IPCOM000122613D
Original Publication Date: 1991-Dec-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 68K

Publishing Venue

IBM

Related People

Busacco, RA: AUTHOR [+2]

Abstract

Gel time of an epoxy or similar polymer at a given temperature is a very critical parameter. Measurement of gel time is usually done in the bulk form. Gelling properties of epoxies and similar materials are sometimes significantly different in the thin film form.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 65% of the total text.

Gel Time Measurement Device for Epoxies and Similar Polymers

      Gel time of an epoxy or similar polymer at a given
temperature is a very critical parameter.  Measurement of gel time is
usually done in the bulk form.  Gelling properties of epoxies and
similar materials are sometimes significantly different in the thin
film form.

      The following defines two techniques for determining gel times
of the above type of materials in thin film form. Figure 1
illustrates the first technique.  The sample material is kept in a
shallow container (like a petri dish) on a constant temperature
stage.  A digital clock mechanism is mounted over the dish.  A stylus
is attached to the minute hand of the clock.  The height of the clock
is adjusted such that the stylus dips into the liquid material. At
the start of the experiment, the minute hand of the clock is preset
to a mark on the sample container.  The clock is then allowed to run
as normal.  As the material gels, the stylus describes a trajectory
in the material, as shown in Figure 1.  When the gelling is complete,
the stylus is no longer able to move and the trajectory ends.  By
measuring the angle of the trajectory, the gelling time can be
estimated.  For example, if the minute hand turns through 150
degrees, this corresponds to a period of 25 minutes.  The sample
container can be calibrated to read minutes.  In the case of a
material that takes hours to gel, the stylus could be attached to the
hour hand of...