Effects of casein on flammability and mechanical characteristics of medium density fibreboards based on formaldehyde-free resin system
Materials Today: Proceedings(2023)
摘要
As one of the major milk proteins, casein has mainly been used in food and medical industries. Its applications have also been expanded to other areas, including its use as a textile fibre, coating material and as an adhesive. However, more recently, casein has shown great potential as an alternative flame retardant (FR) because it is non-toxic and biodegradable. Nevertheless, there are limited studies to investigate the effects of casein on flame retardant and mechanical properties of wood-based panels. In this research, we have set up a manufacturing process to fabricate fire resistant medium density fibreboards (MDFs). Casein is used as an FR compound to explore its effects on the fire and mechanical performance of wood-based MDF panels. Moreover, a soy flour-based resin system is selected as a replacement for the commonly used toxic formaldehyde-based resin. Two approaches are employed for the casein incorporation during the MDF manufacturing process: one is to spray casein solutions and another is to add pulverized casein particles. The spraying method with casein solution improves the flexure strength by approximately 48% compared to that of non-treated MDF samples, while the flexure strengths of MDF panels with ground casein particles dropped by nearly 26%. The addition of casein also reduced the heat release rate of the panel with a more compact char structure. The research clearly indicates the possibility of manufacturing fire-retardant casein-based MDF panels for their use in fire-prone areas.
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关键词
Casein,Char formation,Medium density fibreboard,Formaldehyde-free,Soy flour-based resin
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