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24. Nov 2021 | Application Areas

Phytic acid for improved flame retardancy of wood

A recently published paper studied the influence of phytic acid on the flame retardancy and the adhesion performance enhancement of poly (vinyl alcohol) hydrogel coating to wood substrate.
The green fireproof hydrogel coating does not release any toxic volatiles.
Image source: pxel_photographer - Pixabay (symbol image).

Traditional fireproof strategies for wood mainly involve using organic flame retardants that may affect human health and environment. Scientists now proposed an easy-to-process, environmentally friendly and highly efficient polyvinyl alcohol (PVA)/phytic acid (PA) hydrogel coating to improve flame retardancy of wood by freeze-thaw cycles. PA can promote the gelatinisation of PVA and further enhance mechanical properties and flame retardancy of PVA coating.

Ensured fire-safety of wood

The obtained PVA/PA hydrogel coating shows better adhesion and fire-safety performance compared to pure PVA hydrogel coating, including achieving 151.68 kPa of adhesion strength, reaching V0 rating in UL-94 test, a significant enhancement of time to ignition (TTI, from 63 s to 130 s), and 51.47% and 55.47% decrease in the mean heat release rate (HRR) and total release rate (THR), respectively. According to the researchers, the PVA/PA coating with enhanced superior adhesion and flame-retardant properties ensures the fire-safety of wood for its wide applications as structural materials in architecture and furniture fields.

The study has been published in Progress in Organic Coatings, Volume 161, December 2021.

EC Library Waterbased Acrylates for Decorative Coatings

Books

Waterbased Acrylates for Decorative Coatings

Aqueous polyacrylates, as binders, dispersing resins and thickening polymers, are nowadays impossible to do without as raw materials in the paints and coatings industry. Since their introduction in the 1950s and 60s, straight acrylic and styrene acrylic dispersions have established themselves as environment-friendly, high-performace alternatives to the solvent-borne, air-drying alkyd resin binders used principally before. The particularly wide performance spectrum and high level of variability of the polyacrylates has enabled the propagation and consistent ongoing development of this product class as binders for coating materials. This book gives an overall view of the preparation and properties of aqueous acrylic dispersions and also the special features pertaining to their use in the architectural coatings sector. Following a general introduction to dispersions and emulsion paints manufacture at the beginning of the book, specialized chapters give a deeper insight into the diverse products such as primers, masonry paints, interior paints, plasters, wood coatings and gloss emulsion paints. The book presents an picture of the preparation of acrylic binders and the formulation of architectural paints. It is aimed both at students and newcomers to the paints and coatings field as well as at experienced dispersion users and practitioners in the paints and coatings industry.

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