Author

Karnakote

Date of Award

4-2003

Degree Name

Master of Science

Department

Chemical and Paper Engineering

Department

Paper Engineering, Chemical Engineering and Imaging

First Advisor

Dr. Thomas Joyce

Second Advisor

Dr. Margaret Joyce

Third Advisor

Dr. Dan Fleming

Access Setting

Masters Thesis-Open Access

Abstract

Infrared units are widely used in paper coating drying to initiate evaporation and quickly reach solids immobilization point. Thermal efficiency of IR units can be improved by increasing absorption of coating color. Borate compounds have shown good IR absorption at wavelengths typical to commercial IR units.

The objective of this research was to evaluate the compatibility of selected borate-containing compounds with the primary components of the paper coatings like clays, carbonates, and some binders.

Coatings were prepared at 60% solids and viscosity and pH were adjusted to 900-1200 cp and 8.5-9.5 respectively. Dynamic stress and frequency sweeps were carried out using Rheometrics 5000. High shear measurements were done using Hercules high shear viscometer.

The borate compounds were found to interact with the coating components. The interactions of borates differed with pigment and binder type. There was a marginal increase in pH and viscosity with concentration of borate in the coating color. The strength and amount of interaction increased with the concentration of borate in the system. At borate concentrations < 1 % (by weight), interactions are weak and do not adversely impact with the rheological properties at high shear.

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