Printer Friendly

Manufacturing: tips for manufacturing synthetic resins.

Q. In our coating plants, we produce many types of synthetic resins and for each type we must comply with several recipes. Is there an easier, more reliable way to monitor the product viscosity and determine the end of the reaction other than the classical manual sampling and laboratory testing?

A. There are reactor mounted viscometers with probes inserted in the reactor. Generally, they are unreliable because of inaccurate temperature measurements and interferences with nitrogen bubbles or solid particles in the reactor contents.

The best and most accurate way is on-line continuous viscosity measurement where a small quantity of product is circulated through a viscometer mounted in an independently temperature controlled enclosure nearby the reactor. Such a system is used for alkyd, polyester, epoxy resins and polycondensation reactions.

There are several considerations that must be addressed with on-line continuous viscosity measurement such as: In order to operate the system, a flanged connection must be available or installed on the lower section of the reactor. This may not be always the case with existing equipment. The system is limited to resin manufacturing reactions where the viscosity evolves during the batch and represents a valuable parameter to monitor.

However, this viscosity measurement system presents several advantages: The signal generated by the viscometer is directly correlated to the product viscosity. It represents a real time measurement and reliable way to monitor the reaction process. This viscosity monitoring can be made at temperatures different from the reactor temperature, thus allowing flexibility with the instrument calibration and the selection of the viscosity range.

The end of the reaction can be exactly determined, thus eliminating off specs products and waste.

The process can be entirely automated, thus reducing batch time and operating costs.

Product quality as endpoint viscosity can be achieved for each recipe.

--Bernard Seguy, RHE America

(info@rhe-america.com)

Bernard Seguy is President of RHE America. He holds a Masters Degree in Chemical Engineering from the University of Lille in France.

Send Manufacturing Questions to: c/o Editor, JCT CoatingsTech

492 Norristown Rd., Blue Bell, PA 19422-2350

email: publications@coatingstech.org
COPYRIGHT 2004 Federation of Societies for Coatings Technology
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 2004, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.

Article Details
Printer friendly Cite/link Email Feedback
Title Annotation:Q & A
Author:Seguy, Bernard
Publication:JCT CoatingsTech
Date:Jul 1, 2004
Words:347
Previous Article:FSCT events.
Next Article:2004 ICE current list of exhibitors: as of 6/15/04.


Related Articles
PRODUCT NEWS.
Dow acquires interest in Korea's Pacific Epoxy Ltd.
Pilot unit facilitates ability to produce resins.
Structural adhesives.
Goodyear sells Wingtack business to Sartomer.
China's synthetic rubber production grows in May.
GE introduces resins with post-consumer content for auto industry.

Terms of use | Privacy policy | Copyright © 2021 Farlex, Inc. | Feedback | For webmasters |