纤维素纳米晶体/石墨烯复合溶液对双组份水性聚氨酯涂料性能的影响
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摘要
随着大众生活品质的提升,对于水性木器涂料的性能要求也不断提高,无毒环保、力学性能优良的水性涂料在家居木制品行业的应用需求不断增多。本研究围绕水性木器涂料,以纤维素纳米晶体溶液(CNC)为分散液,以生物质源石墨烯(Gr)为涂料改性剂,开发出高硬度、高附着力、高耐磨特性的双组份水性聚氨酯涂料(2K-WPU),改善水性涂料力学性能不理想的现状,以扩大其在家居木制品行业的应用范围。研究结果表明:CNC/Gr复合溶液的添加,使2K-WPU固化后涂层的硬度、耐磨性有不同程度的提高,而光泽度有所下降。其中,涂层附着力在CNC/Gr不同添加量条件下保持1级不变;铅笔硬度由5H提高至6H;CNC质量浓度为4%,Gr添加量占比为3%时,涂层的耐磨性最好,磨耗量为0.0 453 g;涂层光泽度随CNC/Gr添加量增加,由21.8%降低至6.1%。CNC/Gr改性水性涂料的方法,绿色环保且实验步骤简单易操作,为开发性能优良的功能型水性木器涂料提供有效途径。
With the increasing pursuit of the quality of life, the performance requirements of waterborne wood coatings are becoming more higher. The application requirements of waterborne coatings with nontoxic environment-friendly and excellent mechanical properties in the domestic wood products industry are increasing. In this paper, the two-component waterborne polyurethane coatings(2 K-WPU) with high wear resistance, high hardness and high adhesion were developed by using cellulose nanocrystalline solution(CNC) as dispersion and biomass source graphene(Gr) as coating modifier, which can improve the present situation of poor mechanical properties of waterborne coatings in order to expand their application scope in household wood products industry. The results showed that the hardness and wear resistance of the coating were improved and the gloss decreased with the addition of CNC/Gr composite solution. The adhesion of the coating didn't change at the condition of different CNC/Gr composite solution loadings and the hardness increased from 5 H to 6 H. When the ratio of CNC was of 4% and Gr was 3%, the coating had the best wear resistance and the amount of wear was 0.0 453 g. The gloss of the coating decreased from 21.8% to 6.1%. The CNC/Gr composite solution modified waterborne coating method is environmental friendly and experimental easily. It is simple and easy to operate and provides an effective way to develop functional waterborne wood coatings with good performance.
With the increasing pursuit of the quality of life, the performance requirements of waterborne wood coatings are becoming more higher. The application requirements of waterborne coatings with nontoxic environment-friendly and excellent mechanical properties in the domestic wood products industry are increasing. In this paper, the two-component waterborne polyurethane coatings(2 K-WPU) with high wear resistance, high hardness and high adhesion were developed by using cellulose nanocrystalline solution(CNC) as dispersion and biomass source graphene(Gr) as coating modifier, which can improve the present situation of poor mechanical properties of waterborne coatings in order to expand their application scope in household wood products industry. The results showed that the hardness and wear resistance of the coating were improved and the gloss decreased with the addition of CNC/Gr composite solution. The adhesion of the coating didn't change at the condition of different CNC/Gr composite solution loadings and the hardness increased from 5 H to 6 H. When the ratio of CNC was of 4% and Gr was 3%, the coating had the best wear resistance and the amount of wear was 0.0 453 g. The gloss of the coating decreased from 21.8% to 6.1%. The CNC/Gr composite solution modified waterborne coating method is environmental friendly and experimental easily. It is simple and easy to operate and provides an effective way to develop functional waterborne wood coatings with good performance.
引文
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[2]魏伟,吕伟,杨全红.高浓度石墨烯水系分散液及其气液界面自组装膜[J].新型炭材料,2011,26(1):36-40.
[3]杨全红,吕伟,杨永岗,等.自由态二维碳原子晶体:单层石墨烯[J].新型炭材料,2008,23(2):97-103.
[4]王能,丁恩勇,程时.纳米微晶纤维素表面改性研究[J].高分子学报,2006,1(8):982-987.
[5]曹坤丽,吴燕,于成宁,等.纤维素纳米晶体/KH560对UV固化水性木器涂层性能的影响[J].林业工程学报,2016,1(2):135-139.
[6]于成宁,王晓棠,吴燕,等.纳米纤维素诱导制备硅溶胶及其改性[J].家具,2015,36(2):13-16.
[7]杨全岭,杨俊伟,石竹群,等.纳米纤维素基导电材料及其在电子器件领域的研究进展[J].林业工程学报,2018,3(3):1-11.
[8]叶代勇.纳米纤维素的制备[J].化学进展,2007,19(10):1568-1575.
[9]闫小星,赵静,吴燕,等.协同改性对水性UV木器涂料性能的影响[J].林业科技开发,2014,28(6):75-78.
[10]潘泽华,吴燕,唐沁雯,等.纳米晶体与蓄光型发光材料复合改性水性聚氨酯木器涂层的物理力学性能研究[J].家具,2018,39(3):11-15.
[11]张伟钢,曾银伍.石墨烯对聚氨酯/Al复合涂层光泽度及红外发射率性能的影响[J].表面技术,2017,46(12):175-178.
[12]赵群.纳米微晶纤维素的制备、改性及其增强复合材料性能的研究[D].上海:东华大学,2013.