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By replacing tackifier resin, mineral oils have the potential to make flooring adhesives more cost effective without compromising strength and flexibility.
The construction and renovation industries are creating increased demand for new flooring, and thanks to improvements in technology, consumers have never had such a wide variety of different materials to choose from. This has partly been made possible by the developing of new floor adhesives. However there is still scope for further improvements and Nynas is currently investigating ways in which mineral oils can help make floor adhesives more cost effective.
"The cost of resin is high, so if we can partially replace it with mineral oil while still maintaining the same adhesive properties, it can make a significant cost reduction," says Peter Kaali, Technical Coordinator for CMI & Tyre, Nynas.
Floor adhesives essentially must meet four key criteria. Its viscosity must allow for easy application, it must offer sufficient open time (the time between application and bonding), offer high adhesive strength, and enough flexibility to tolerate extension and contraction in flooring materials over time.
Through its research, Nynas gradually replaced increasing amounts of resin with naphthenic oil with varying degrees of viscosity, while measuring the four parameters above. The results showed that higher viscosity oils could be used to replace up to 50% of resin while still maintaining flexibility, open time, adhesion and strength.
"The level of oil an adhesive system can tolerate is dependent on the flooring materials and the application," adds Kaali. "However our results do indicate that it is certainly feasible to replace high levels of tackifier resin with naphthenic oils."