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Thursday, February 20 • 11:00am - 11:30am
The Effect of Microfibrillated Cellulose on Mechanical Properties and Performance of Acrylic Elastomeric Roof Coatings - Borregaard

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Waterbased acrylic elastomeric roof coatings have become a hot topic lately.  One of the reasons is that they reduce the heat absorption of the buildings when compared to the traditional asphalt roofs.  In addition to heat prevention and energy savings, acrylic roof coatings protect the underlying material from water, UV radiation, chemicals and wear.  Waterbased acrylic roof coatings are typically thickened with cellulosics and associative thickeners.  Their use can often lead to challenges in both water resistance and absorption of the coating.  In addition, the control of syneresis and sagging is often challenging.  Microfibrillated cellulose (MFC), a biobased and multifunctional product made from cellulose, consists of fibrils with lateral dimensions in the nanoscale and lengths up to micron scale.  These strong and rather stiff fibrils are able to form strong films (tensile strength up to 210 MPa).  Once MFC is added to a paint, a noticeable effect is usually seen on the mechanical properties of the final coating.  In addition to the effect on mechanical properties, the unique rheological properties allow formulation of stable and easily applicable paints.  The high yield stress of MFC coatings prevents settling of heavy particles as well as floating of hollow microspheres, whereas the strong shear thinning allows the spraying of thick formulations.  Their exceptional thixotropic behavior leads to excellent sag resistance combined with good levelling.  The aim of this work was to evaluate the effect of MFC on the key properties of acrylic elastomeric roof coatings such as tensile strength, water resistance, mud cracking and adhesion to metal and concrete surfaces.  Commonly used thickeners were used as references.  To deepen the understanding of the impact of MFC on tensile strength and elongation and the relationship between these two parameters, different fibrillation degrees and dosage levels of MFC were used.  We will demonstrate how MFC increases the tensile strength of elastomeric acrylic roof coatings without sacrificing its elongation and overall performance.

avatar for Otto Soidinsalo

Otto Soidinsalo

Technical Application Manager, Borregaard
Otto Soidinsalo, Technical Application Manager, BorregaardDr. Otto Soidinsalo holds a Ph.D. in organic chemistry from the University of Helsinki. Currently he works as a Technical Application Manager at Borregaard. Before joining Borregaard, Otto has been working in various positions... Read More →

Thursday February 20, 2020 11:00am - 11:30am
Rhythms Room I