高硬度聚氨酯-石墨烯透明涂层制备研究  

Preparation of polyurethane-graphene coating withhigh hardness and transparency

作　　者：焦天琪 林铭 陈国华[2] JIAO Tianqi;LIN Ming;CHEN Guohua(School of Chemical Engineering,Huaqiao University,Xiamen 361021,China;School of Materials Science and Engineering,Huaqiao University,Xiamen 361021,China)

机构地区：[1]华侨大学化工学院,福建厦门361021 [2]华侨大学材料科学与工程学院,福建厦门361021

出　　处：《功能材料》2023年第9期9183-9189,共7页Journal of Functional Materials

基　　金：国家自然科学基金项目(51373059);福建省石墨烯粉体及复合材料工程技术研究中心建设项目(20172001);厦门市高分子与电子功能材料重点实验室项目(2022-01);福建省高校产学合作项目(2021H6027)。

摘　　要：聚氨酯(PU)具有绿色、环保等优点,常作为罩光涂层应用于物体表面,但其硬度等性能还需大幅提升,以适应高端要求。由于罩光涂层的特殊性,一般的改性方法难以同时满足高硬度与高透光的要求。单层石墨烯具有优异的力学性能及透光性,选用其对聚氨酯进行改性。首先制备单层氧化石墨烯(GO)并分散于聚氨酯体系,获得聚氨酯-单层氧化石墨烯复合涂层,然后进行还原获得高硬度聚氨酯-石墨烯透明涂层。研究了GO的添加量及还原情况对涂层的抗划伤性以及透光性等方面影响。结果表明,氧化石墨烯与聚氨酯形成交联网络,提升了聚氨酯基体的力学性能,且还原为石墨烯后涂层力学性能进一步提升;当GO添加量达到0.05‰(质量分数),涂层铅笔硬度较纯漆薄膜提升了3~5个数量级,且聚氨酯-石墨烯涂层的透光性较纯聚氨酯涂层降低程度在10%之内。Polyurethane(PU)has the advantages of green and environmental protection,It is often used as a coating on the surface of objects,but its hardness and such performance need to be greatly improved to meet the high-end requirements.Due to the particularity of the coating,it is difficult to meet the requirements of high hardness and high light transmittance at the same time by general modification methods.Monolayer graphene has excellent mechanical properties and light transmission.In this paper,it is selected to modify polyurethane.Firstly,monolayer graphene oxide(GO)was prepared and dispersed in the polyurethane system to obtain the polyurethane-monolayer graphene oxide coating,and then the high hardness and transparent polyurethane-graphene coating was obtained by reduction.The effects of GO content and reduction on scratch resistance and light transmittance of the coating were studied.The results show that the crosslinking network between GO and polyurethane can improve the dispersibility of GO and the mechanical properties of the polyurethane matrix,and the mechanical properties of coating were further improved after reduction to graphene.When the amount of GO reached 0.05wt‰,the pencil hardness of the coating was increased by 3-5 orders of magnitude compared with the pure polyurethane coating,and the light transmittance of the polyurethane-graphene coating was reduced within 10%compared with the pure polyurethane coating.

关 键 词：聚氨酯 单层石墨烯 铅笔硬度 透光性 涂层 

分 类 号：TB332[一般工业技术—材料科学与工程]