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Bruce Prezzavento - Studies on the Performance of Coatings Containing Highly Fibrillated HDPE Fibers

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Bruce Prezzavento - Studies on the Performance of Coatings Containing Highly Fibrillated HDPE Fibers

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Dr. Bruce Prezzavento
Technical Director 
Minifibers, Inc.
(423) 282-4242 x241
www.minifibers.com
Co-authors: Jeff Hyde


BIO
Bruce Prezzavento earned a PhD in Physical Organic Chemistry at The University at Albany and an MBA at the University of Minnesota. His experience encompasses the fields of chemistry and chemical engineering, mechanical engineering, computer hardware and software engineering, and business management, in both industry and academia. His current interests involve the use of highly fibrillated high-density polyethylene to improve the physical performance of coatings and concrete.


ABSTRACT

Synthetic fibers are usually produced via melt or solution spinning processes that yield filaments that are rod like in structure.  Via a unique process, highly fibrillated fibers can be produced which have extraordinary three dimensional structures.  These kinds of fibers impart unique properties when used in a wide range of coatings applications.

Studies find that these fibers can suspend pigment and filler particles very effectively by trapping them in the voids of their three dimensional structure. This property gives rise to prevention of hard settling in coatings in which they are used.

Coatings made with these fibers are less susceptible to water absorption leading to improved water resistance. Data on this property will be presented.  Coatings containing these fibers also show improved flexibility which leads to crack resistance.  Data on film ductility will be shared.  Also, films containing these fibers exhibit improved impact resistance as well as better performance when they are subjected to freeze thaw cycles.  Data on this performance will be presented.  In addition, these fibers have been observed to improve coalescence as measured by the reduction of the minimum film formation temperature of emulsions when these fibers are present,

Finally, these fibers are reliable thixotropes, acting in a physical manner with the arms of the fiber in the fluid resisting flow, and then when subjected to shear, thinning because the fibrils fold-in reducing viscosity resulting in pseudo-plastic rheology.  The rheological properties of coatings made with these fibers will be presented. Interesting results in deeply tinted paint systems which can be problematic for rheology after tinting will also be presented.

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