Journal ArticleDOI
Rheological studies of two component high build epoxy and polyurethane based high performance coatings
Ajit Deka,Nirmalya Dey +1 more
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TLDR
In this paper, a study of rheometric profile of several rheological additives in two-component (2K) high-build epoxy zinc phosphate primer and 2-component aliphatic polyurethane topcoat is presented.Abstract:
The work presented in this article involves the study of rheometric profile of several rheological additives in two-component (2K) high build epoxy zinc phosphate primer and two-component high build aliphatic polyurethane topcoat. Viscosity profile and thixotropic behavior at different shear rates have been determined for both the paints using Physica MCR 301 Rheometer of Anton Paar. The valuable information derived from these measurements led to better insight into the influence of these rheological additives on important paint properties like flow and leveling, sag control, in-can settling during storage, etc. Rheometric results were also compared with the results obtained during the actual application of these experimental coatings on mild steel panels. From the rheological study it was concluded that the thickeners based on surface-modified clay and organically modified castor oil derivative work well in epoxy zinc phosphate primer whereas polyurea-based thickener showed better results than other rheological additives in the case of the 2K polyurethane system. Measurement of low shear and high shear viscosity response of different thickeners helps in predicting storage and application behavior of these coatings which correlates well with the actual observation.read more
Citations
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Journal ArticleDOI
Slow release coating remedy for nitrogen loss from conventional urea: a review.
TL;DR: The aim of the current review is to develop technical understanding of the conventional and non-conventional coating materials and associated spray coating mechanism for slow release urea production and the potential of starch as the coating material in relation to the coatings tested previously for controlled release fertilizers.
Journal ArticleDOI
Micro- and Nanofibrillated Cellulose as a Rheology Modifier Additive in CMC-Containing Pigment-Coating Formulations
TL;DR: In this article, a comparison of dewatering and rheological characteristics of coating colors, based on three different pigments and mixtures thereof, is illustrated using CMC as the cobinder and incorporated with viscoelasticity-inducing starch, carboxymethyl cellulose (CMC), and polyacrylic thickeners.
Journal ArticleDOI
Effect of xylan in hardwood pulp on the reaction rate of TEMPO-mediated oxidation and the rheology of the final nanofibrillated cellulose gel
Timo Pääkkönen,Katarina Dimic-Misic,Hannes Orelma,Raili Pönni,Tapani Vuorinen,Thaddeus Maloney +5 more
TL;DR: In this paper, the xylan content of the feed pulp was found to have a large negative influence on the oxidation rate of the pulp, as the oxidation time shortened when xylan was removed, from 220min to 28min.
Journal ArticleDOI
Testing of starch-based carbohydrate polymer coatings for enhanced urea performance
TL;DR: In this paper, a starch-urea-borate adhesives were developed for coating the slow release urea, and the physical properties of the developed adhesive were studied as a function of temperature, heating time, stirring rate, and pH.
Journal ArticleDOI
Attributes of natural and synthetic materials pertaining to slow-release urea coating industry
TL;DR: In this article, the benefits and limitations of polymeric and non-polymeric coating materials, release mechanism of conventional and coated urea, methods to characterise the coated Urea, slow-release characteristics imparted by a coating to the URE agent, and release patterns of conventional URE agents.
References
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Book
Non-Newtonian Flow and Applied Rheology: Engineering Applications
Raj P. Chhabra,J.F. Richardson +1 more
TL;DR: The only dedicated non-Newtonian flow reference in print is as mentioned in this paper, which is a self-contained reference for anyone studying or working with the processing and handling of fluids, including pharmaceutical engineers, mineral processing engineers, medical researchers, water and civil engineers.
Journal ArticleDOI
Surface modified fumed silicas for modern coatings
M. Ettlinger,T. Ladwig,A. Weise +2 more
TL;DR: Fumed silicas have been successfully used for some decades to control the rheology of organic coatings by providing a strong thixotropic effect and a yield point, especially for modern coating systems.
Journal ArticleDOI
Rheological methods for characterising modern paint systems
TL;DR: In this article, the most important measuring methods for studying the rheological behaviour of modern paint systems are presented (oscillation tests, determination of low yield points) and compared with flop-index values.
Journal ArticleDOI
The levelling of thixotropic coatings
Olivier Cohu,Albert Magnin +1 more
TL;DR: In this article, the surface tension driven levelling of non-evaporative paint films was investigated and stepwise calculations, based on Orchard analysis, were derived in order to take the thixotropic structure recovery into account.
Journal ArticleDOI
The role of sag control agents in optimizing the sag/leveling balance and a new powerful tool to study this
TL;DR: In this article, it is shown that sag control agents can be used to improve the sag and leveling behavior of wet paint during drying and curing in a quantitative manner, which is very useful in identifying the cause and nature of poor coating appearance and facilitates development of paints with good sag and leveling behavior.