木材科学与技术2025，Vol.39Issue(1)：37-46,10.DOI:10.12326/j.2096-9694.2024115
桐油基自修复木器涂层的构建及其界面特性
Construction and Interfacial Characteristics of Self-Healing Tung Oil-Based Wood Coatings
摘要
Abstract
Surface coating is an important method to increase the value and expand the application of wood products.The scientific research and product development on green waterborne wood coatings with self-repairing function is an effective way to achieve the protection of wood,enhance the quality,and increase the product values.Using tung oil as a raw material,bio-based waterborne polyurethane coatings are prepared through controlled synthesis and directional regulation of oil molecular functionalization to strengthen the surface coating of wood materials,heighten interfacial adhesion and increase integration of self-repair functions.The hydrophobic effect of the long carbon chain segment of tung oil fatty acids effectively reduces the molecular water sensitivity of the polyurethane system and improves the wet adhesion resistance of the coating;the oxidative cross-linking property of the conjugated double bonds of the side chains give the coating a good self-curing performance;and the use of boronated ester bond capping provides a dynamic response unit for the polyurethane network structure,which realizes the high efficiency of self-repairing of water-based coatings under the room temperature environment.The microscopic mechanism of the interaction between the coating and the wood surface is elucidated by systematically investigating the coating and its wood interfacial properties,including intrinsic mechanical strength,interfacial adhesion,and abrasion resistance.The results show that the prepared tung oil-based aqueous urethane emulsions have a stable and homogeneous dispersion characteristics;the absolute values of the zeta potentials are over 30 mV;when the nanocellulose additive content is introduced to 1.0%(mass fraction),the mechanical properties of the composite coatings(tensile strength,tensile strength,abrasion resistance,etc.)are effectively improved.When nanocellulose is introduced at 1.0%,the mechanical properties of the composite coating are improved(tensile strength of 9.3 MPa,modulus of 11.3 MPa,and fracture energy of 19.58 kJ/m2);the repair efficiency at the room temperature reaches 98.4%(taking fracture strain as a reference);the coating on the solid wood surface exhibits good adhesion and abrasion resistance.It exhibits a stable interfacial adhesion strength in a humid environment(RH=95%)with the lap shear strength of 7.1 MPa.关键词
桐油/水性聚氨酯/木器涂层/自修复/界面黏附Key words
tung oil/waterborne polyurethane/wood coating/self-healing/interfacial adhesion分类
化学工程引用本文复制引用
王钟,熊鹏飞,李敏,陈小龙,汪钟凯..桐油基自修复木器涂层的构建及其界面特性[J].木材科学与技术,2025,39(1):37-46,10.基金项目
国家自然科学基金青年项目"基于仿生"类多巴"分子拓扑结构构建的桐油基压敏胶黏附增强机制研究"(32401532) （32401532）
"十四五"国家重点研发计划项目"木本油脂基高抗材料制备关键技术"(2022YFD2200802). （2022YFD2200802）
