Thermal Degradation and Product Analysis of 3-iodo-2-propyl-butylcarbamate as a Wood Preservative

Abstract

The thermal degradation kinetics and degradation products of IPBC during the heating process are investigated herein. Experiments were conducted at isothermal conditions from 60 °C to 150 °C. The remaining IPBC content was analyzed by high-performance liquid chromatography (HPLC) at specific time intervals for each test, and the kinetic model of IPBC thermal degradation was established. The thermal degradation products of IPBC were studied by ultra-performance liquid chromatography-mass spectrometry (UPLC−MS/MS). The results showed that thermal degradation of IPBC occurred at 70 °C, and the degradation rate increased significantly from 70 °C to 150 °C. The thermal degradation kinetics of IPBC conformed to the first-order reaction and from 60 °C to 150 °C. Seven degradation products such as prop-2-yn-1-yl ethylcarbamate and methyl N-butylcarbamate were identified and the degradation reaction pathway and the mechanism of IPBC were proposed, which involved deiodination, demethylation, deethynylation, deethylation, and hydroxylation processes.

Mold and Stain Resistance of Bamboo Treated with Pyraclostrobin Fungicide

“…The results of IPBC against mold and stain fungi confirmed its high efficiency, consistent with previous reports. However, IPBC is unstable under ultraviolet light and heat [21,33]. In contrast, pyraclostrobin is a stable compound; thus, the combination of pyraclostrobin and IPBC provides advantages.…”

“…The control efficacy of IPBC was 75% against Botryodiplodia theobromae and 100% against mixed mold strains at a concentration of 0.1%, i.e., the active ingredient retention of the treated bamboo was 0.39 g/m 2 [20]. Unfortunately, the long-term effectiveness of IPBC is low due to its instability in high-light and high-heat conditions [21]. It is also expensive to treat bamboo and has application restrictions.…”