Vasiliauskienė Dovilė, Balčiūnas Giedrius, Boris Renata, Kairytė Agnė, Kremensas Arūnas, Urbonavičius Jaunius
Department of Chemistry and Bioengineering, Vilnius Gediminas Technical University, LT-10223 Vilnius, Lithuania.
Institute of Building Materials, Faculty of Civil Engineering, Vilnius Gediminas Technical University, LT-08217 Vilnius, Lithuania.
Materials (Basel). 2020 Nov 21;13(22):5275. doi: 10.3390/ma13225275.
In this study, tung tree and linseed drying oils, as well as semi-drying hempseed oil, were analyzed as the protective coatings for biocomposite boards (BcB) made of hemp shives, corn starch binder, and the performance-enhancing additives. The hydrophobization coatings were formed at 40, 90, and 120 °C temperatures, respectively. The physical-mechanical properties such as the compressive strength, thermal conductivity, dimensional stability, water absorption, and swelling were tested. In addition, scanning electron microscopy (SEM) was employed for the analysis of the board microstructure to visualize the oil fills and impregnation in pores and voids. It was demonstrated that the compressive strength of oil-modified BcBs compared to uncoated BcBs (at 10% of relative deformation) increased by up to 4.5-fold and could reach up to 14 MPa, water absorption decreased up to 4-fold (from 1.34 to 0.37 kg/m), swelling decreased up to 48% (from 8.20% to 4.26%), whereas the thermal conductivity remained unchanged with the thermal conductivity coefficient of around 0.085 W/m·K. Significant performance-enhancing properties were obtained due to the formation of a protective oil film when the tung tree oil was used.
在本研究中，对桐油和亚麻籽油以及半干性大麻籽油作为由大麻屑、玉米淀粉粘合剂和性能增强添加剂制成的生物复合板（BcB）的保护涂层进行了分析。疏水化涂层分别在40、90和120°C的温度下形成。测试了抗压强度、热导率、尺寸稳定性、吸水性和膨胀率等物理机械性能。此外，采用扫描电子显微镜（SEM）分析板材微观结构，以观察孔隙和空隙中的油填充和浸渍情况。结果表明，与未涂覆的BcB相比，油改性BcB的抗压强度（在相对变形为10%时）提高了4.5倍，可达14 MPa，吸水率降低了4倍（从1.34降至0.37 kg/m），膨胀率降低了48%（从8.20%降至4.26%），而热导率保持不变，热导率系数约为0.085 W/m·K。使用桐油时，由于形成了保护油膜，获得了显著的性能增强特性。
