季铵化纳米纤维素增强预油漆纸性能

Properties of finish foil enhanced by quaternized nanocellulose

【目的】为解决预油漆纸用三聚氰胺–脲醛树脂存在甲醛释放等环保问题,开展了利用无醛水性浸渍胶黏剂和涂料制备无醛预油漆纸的应用技术研究。【方法】以季铵化纳米纤维素改性水性丙烯酸酯乳液作为浸渍胶黏剂制备预浸胶纸,并在表层辊涂水性丙烯酸酯类涂料制备预油漆纸。利用X射线光电子能谱仪(XPS)、热重分析仪和万能力学试验机分别对预油漆纸的表面化学基团和元素含量变化、热稳定性能和拉伸性能进行分析和测试。【结果】原纸经浸渍季铵化纳米纤维素增强水性丙烯酸酯乳液并涂饰油漆后制备的预油漆纸纵向抗张强度和断裂伸长率分别增加了4.2倍和3.2倍,并且可任意角度折叠,柔韧性能优异。预油漆纸甲醛释放量为0.12 mg/L,达到国内外干燥器法甲醛释放量最严等级—日本标准F星级认证中F^(☆☆☆☆)级(甲醛释放量≤0.3 mg/L)要求。XPS分析表明:与原纸相比,预油漆纸表面化学结构和元素含量发生变化,经过丙烯酸酯胶黏剂和涂料处理后表面疏水性能提高。热重分析结果显示:与原纸相比,预油漆纸的热稳定性能略微下降。除表面耐磨性能和硬度,预油漆纸饰面板的抗冲击性能、耐干热性能、耐湿热性能、耐水性能和耐污染腐蚀性能均能满足GB/T 15102—2017《浸渍胶膜纸饰面纤维板和刨花板》和GB/T 37005—2018《油漆饰面人造板》的要求。【结论】利用季铵化纳米纤维素增强的预油漆纸具有良好的环保和力学性能。

[Objective]In order to solve the environmental problems such as formaldehyde release of melamine-urea formaldehyde resin for finish foil,the technology research on preparation of formaldehydefree finish foil by formaldehyde-free water-based impregnating adhesive and coating was carried out.[Method]Quaternized nanocellulose-modified waterborne acrylate emulsion was used as impregnating adhesive to prepare impregnated paper,and rollers were used to apply acrylic paints on its surface to prepare finish foil.X-ray photoelectron spectroscopy(XPS),thermogravimetric analyzer and mechanics test machine were used to analyze the changes of surface chemical groups and element content,thermal stability and tensile properties of finish foil.[Result]The results showed that the longitudinal tensile strength and elongation at break of finish foil increased by 4.2 times and 3.2 times compared with base papers,respectively.In addition,finish foil could be folded at any angle with excellent flexibility.The formaldehyde emission of finish foil was 0.12 mg/L,which met the requirement of formaldehyde emission value≤0.3 mg/L for F^(☆☆☆☆)limit according to F star rating of Japanese standard.It refers to the strictest level of formaldehyde emission tested by the desiccator method in the world.XPS analysis showed that the surface chemical structure and element content of finish foil changed compared with base paper.The surface hydrophobicity of finish foil was improved after being treated with acrylic adhesives and coating.From the thermogravimetric analysis,finish foil showed a slight decrease in thermal stability compared with base paper.In addition to surface abrasion resistance and hardness,the impact resistance,resistance to dry heat,resistance to damp heat,water resistance and resistance to pollution corrosion of finish foil-topped panels all met the requirements of GB/T 15102—2017 Surface decorated fiberboard and particleboard with paper impregnated thermosetting resins and GB/T 37005—2018 Paint finishing wood-based panels.[Conclusion]The finish foil enhanced by quaternized nanocellulose has good environmental and mechanical properties.