Effects of water-soluble acrylic resin coatings on the pyrolysis behavior of wooden bulky waste

Abstract

Water-soluble acrylic resin coatings (WSARC) are widely applied on wooden furniture surfaces. Moreover, the influence of WSARCs on the reaction mechanism and product properties during fast pyrolysis is critical to the resource disposal of wooden bulky waste. Herein, four samples, including plywood, primer coat paint, finish coat paint, and their mixture, were pyrolyzed and converted into bio-oil and bio-char. Gaussian curve fitting was applied to derivative thermogravimetric analysis curves to separate the reaction stages, and the Coats Redfern method was used to calculate the kinetic parameters during the devolatilization process of pyrolysis. The results showed that WSARCs changed the diffusion path of volatile and extended the entire devolatilization process. Although no significant difference was observed between the experimental and theoretical values in bio-char and bio-oil yield, the increase of the volatile residual time enhanced the secondary cracking/condensation of bio-oil, which decreased the oxygen containing components and increased fatty acid methyl esters/acid. Moreover, the overall devolatilization index D (5.48 × 10−6) was basically similar to the algebraic superposition result (5.11 × 10−6). Nevertheless, the overall apparent activation energy decreased from 85.9 to 60.1 kJ·mol−1 due to the enhancement of the volatile–char interaction.