Challenges in flame retardant wood coatings
Båssar, André (2021)
2021
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe202101121681
https://urn.fi/URN:NBN:fi-fe202101121681
Tiivistelmä
This thesis was carried out with the scope to better understand the underlying challenges of developing novel environmentally friendly flame retardant wood coatings and to find possible solutions for overcoming such challenges. Several different wood types were treated with specialty coating formulations containing various flame retardant additives in order to obtain wood species exhibiting excellent flame retardant properties together with other desired properties such as weathering durability and visual appearance.
Emulsion polymerizations were conducted in order to obtain acrylic waterborne core-shell dispersions having small particle sizes and high tolerance towards electrolytes. Such dispersions might be suitable for exterior and/or interior wood coatings.
One deficiency most wood coatings have is excessive foaming. Excessive foaming can cause problems, especially during industrial application of coating. A test method was developed, and five different antifoaming additives were tested for their defoaming efficacy and their storage stability. DF-2 was found to be suitable for the dispersion, as low amounts of DF-2 had a strong decreasing effect on foaming as well as positive impact on long-term storage stability.
Cone calorimeter tests were performed on several coated wood samples in order to determine the viability of different flame retardant additives. All additive-containing coatings showed improved performance compared to the reference samples. Due to the varying nature of wood samples, the cone calorimeter tests results are indicative and may not fully correspond with full scale fire tests such as SBI.
Emulsion polymerizations were conducted in order to obtain acrylic waterborne core-shell dispersions having small particle sizes and high tolerance towards electrolytes. Such dispersions might be suitable for exterior and/or interior wood coatings.
One deficiency most wood coatings have is excessive foaming. Excessive foaming can cause problems, especially during industrial application of coating. A test method was developed, and five different antifoaming additives were tested for their defoaming efficacy and their storage stability. DF-2 was found to be suitable for the dispersion, as low amounts of DF-2 had a strong decreasing effect on foaming as well as positive impact on long-term storage stability.
Cone calorimeter tests were performed on several coated wood samples in order to determine the viability of different flame retardant additives. All additive-containing coatings showed improved performance compared to the reference samples. Due to the varying nature of wood samples, the cone calorimeter tests results are indicative and may not fully correspond with full scale fire tests such as SBI.