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9. Sep 2022 | Application Areas

Novel flame-retardant coating for wood surfaces

A recently conducted study has focused on an epoxy-modified silicone resin based synergistic flame-retardant coating for wood surfaces.
A blue fist blocks a flaming fist -symbol image.
The combination of various factors improves the coatings flame retardancy. 
Image source: thommas68 - Pixabay (symbol image).

In a new work, an epoxy-modified silicon (SiR) coating was formed by the condensation of dimethyldiethoxysiloxane with 3-glycidoxypropyltrimethoxysilane (KH-560), while the resin cured by nitrogen-containing phosphorus flame-retardant (PTDP) curing agent. The flame-retardant coating (PTDP/SiR) has outstanding hardness, water resistance, solvent resistance and it is appropriate for utilising in wood surfaces.

Improved flame retardancy

Meanwhile, PTDP/SiR-1 exhibits obvious flame retardancy. The PTDP/SiR-1-coated spline received a UL-94 V-1 rating and a 31.0% LOI, compared to 26.0% and 21.5% for the control coating and uncoated splines, respectively. Compared with the control spline, the peak heat release rate decreased by 23%. The mechanism of improving the flame retardancy is due to a dense char layer, incombustible gas, and phosphorus-containing segment formed by pyrolysis. The combination of these factors improves the coatings flame retardancy.

The study has been published in Progress in Organic Coatings, Volume 170, September 2022.

European Coatings Journal


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