摘要
本文通过简单的浸渍法,以聚甲基氢硅氧烷(PMHS)和2,4,6,8-四甲基-2,4,6,8-四乙烯基环四硅氧烷(V4)为反应原料,在木材表面制备得到疏水、耐候和透明有机硅树脂涂层。探究了改性剂浓度、浸渍时间对木材表面接触角的影响。通过接触角测定仪、傅里叶变换红外光谱(FTIR)、扫描电子显微镜(SEM)和X射线能谱分析仪(EDS)对改性前后木材表面的疏水性、化学结构和形貌进行了表征和分析,并对有机硅树脂疏水涂层的稳定性进行了测试。结果表明,当改性液浓度为5%,浸渍时间为5 min时,改性木材表面水接触角可达128°,疏水涂层耐磨损长度达到3200 cm。红外结果表明:改性木材表面成功接枝了有机硅树脂涂层。因此,改性后木材的吸水率从108.5%显著降低到31.3%,具有良好的拒水性。此外,改性木材表面接枝的有机硅树脂涂层也表现出良好的耐酸腐蚀性能和抗紫外老化性能。该方法可望在木质文物保护中得到应用。
A hydrophobic,weather-resistant and transparent coating of silicone resin on wood surface was fabricated by a simple immersion method with poly(methylhydrogen)siloxane(PMHS)and 2,4,6,8-Tetravinyl-2,4,6,8-tetramethylcyclotetrasiloxane(V4).The effect of modifier concentration and dipping time on the contact angle of wood surface were investigated.The chemical composition and morphology of the wood surface before and after the modification were characterized and analyzed by Fourier transform IR spectrum(FTIR),scanning electron microscope(SEM)and X-ray energy spectrometer(EDS),and the stability of the hydrophobic coating of silicone resin was tested.The results showed that the water contact angle of the modified wood surface could reach 128°and the hydrophobic coating resistance length reached 3200 cm when the concentration of the modified solution was 5%and the impregnation time was 5 min.The infrared results indicated that the modified wood surface was successfully grafted with silicone resin coating.As a result,the water absorption of the modified wood was significantly reduced from 108.5%to 31.3%,with good water repellency.In addition,the grafted silicone resin coating on the modified wood surface also exhibited good acid corrosion resistance and UV aging resistance.This method is expected to be applied in the protection of wooden relics.
作者
曹梦婷
张欣向
CAO Meng-ting;ZHANG Xin-xiang(College of Materials Engineering,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350108,China)
出处
《化学研究与应用》
CAS
CSCD
北大核心
2022年第5期1156-1163,共8页
Chemical Research and Application
基金
福建省科学技术厅产业引导性项目(2019H0008)资助。
