环境条件对漆饰水曲柳木材挥发性、极易挥发性有机化合物及其气味释放的影响

Effects of Environmental Factors on VOC/VVOC Release and Odor Characteristics of Painted Manchurian Ash

以聚氨酯(PU)涂料涂饰水曲柳木材为研究对象,利用热脱附-气相色谱-嗅闻-质谱联用仪(TD-GC-MS-O)技术,分析不同环境条件时(温度、相对湿度、气体交换率与负载因子之比)漆饰水曲柳木材28 d释放周期内,挥发性有机化合物(VOC)、极易挥发性有机化合物(VVOC)及其气味释放的变化规律。结果表明:在单一环境条件时,气体交换率与负载因子之比、相对湿度升高,会促使漆饰水曲柳木材的挥发性、极易挥发性有机化合物释放质量浓度和气味强度降低;温度升高,会促进漆饰水曲柳木材的挥发性、极易挥发性有机化合物释放质量浓度和气味强度升高。漆饰水曲柳木材共释放出26种关键性气味特征化合物,其中,起关键性作用的有6种,其特征香型分别为芳香、果香、甜香、花香、留兰香糖、醋香。与温度、相对湿度相比,气体交换率与负载因子之比是影响漆饰水曲柳木材关键气味释放的关键因素。在实际生活中,创造高气体交换率与负载因子之比及高温、高湿环境,有利于漆饰水曲柳木材挥发性、极易挥发性有机化合物和气味释放处于较低水平,保证人民健康。

Polyurethane(PU) paint-finished ash wood was used as a research object to analyze volatile organic compounds(VOC), very volatile organic compounds(VVOC) and odor release patterns during 28-d release cycle of paint-finished ash wood at different environmental conditions(temperature, relative humidity, gas exchange rate to loading factor ratio) by using TD-GC-MS-O. The increase in the ratio of air exchange rate to loading factor and the relative humidity in the single environmental variable condition would promote the decrease in the mass concentration and odor intensity of VOC and VVOC release from lacquered ash wood;the increase in temperature would promote the increase in the mass concentration and odor intensity of VOC and VVOC release from lacquered ash wood. The lacquered ash wood released a total of 26 key odor characteristic compounds, of which 6 played a key role, and their characteristic fragrance types were aromatic, fruity, sweet, floral, lavender, and vinegar. Compared to temperature and relative humidity, the ratio of air exchange rate to loading factor is the key factor affecting the release of key odors from lacquered ash wood. In practice, creating high air exchange rate to load factor ratio and high temperature, high humidity environment is beneficial for lacquered ash wood volatile organic compounds, very volatile organic compounds and odor release at a low level to ensure people’s health.