鳞片状无机填料改性及其对涂层性能的影响

发布时间：2017-12-28 01:26

本文关键词：鳞片状无机填料改性及其对涂层性能的影响　出处：《南京航空航天大学》2016年硕士论文　论文类型：学位论文

【摘要】：鳞片状无机填料在涂层中具有相互平行叠加排列的特性,可以提高涂层的致密性和抗介质渗透性。玻璃鳞片(GF)由于其优良的化学性稳定性、防锈性、耐碱性、耐盐雾性、耐候性等性能,被广泛应用于防腐涂料中。然而,由于玻璃鳞片与聚合物在化学结构和物理形态上存在显著差异,两者相容性较差,严重影响涂料的防腐蚀性能。因此,对玻璃鳞片填料进行表面改性,成为目前研究的热点。本研究针对玻璃鳞片与树脂间相容性较差的问题,采用甲苯-2,4-二异氰酸酯(TDI)、六亚甲基二异氰酸酯(HDI)、γ-(2,3-环氧丙氧基)丙基三甲氧基硅烷(KH560)作为活性桥接剂,制备了三种表面活化接枝的玻璃鳞片(GF-TDI、GF-HDI、GF-KH560)。在GF-TDI、GF-HDI和GF-KH560的基础上接枝包覆端羧基液态丁腈橡胶(CTBN),制备了GF-g-CTBN复合材料;在GF-TDI的基础上接枝包覆苯并三氮唑(BTA)和N,N-羰基二咪唑(05FD),制备了GF-TDI-BTA和GF-TDI-05FD两种复合材料。采用傅立叶红外光谱仪(FTIR)、扫描电镜(SEM)、X射线能谱仪(EDS)对接枝改性效果进行了表征。以普通玻璃鳞片和改性玻璃鳞片分别作为填料、环氧树脂E44为成膜物材料,胺类固化剂NX2015为固化剂配制环氧清漆涂料,研究了改性玻璃鳞片对涂层附着力、耐化学品性、剪切拉伸性、吸水率、耐冲击等性能的影响。结果表明,接枝改性的玻璃鳞片表面出现了有机物的特征峰和C、N元素,表面形貌发生明显变化,证明玻璃鳞片表面成功接枝包覆了有机物。改性玻璃鳞片与树脂的相容性良好,在涂层中分散均匀。环氧清漆涂层的附着力、耐化学品性、剪切拉伸性、抗渗透性、耐冲击等性能得到提高,本研究制备的改性玻璃鳞片填料对进一步提高防腐涂料性能和使用寿命,以及扩大玻璃鳞片填料的应用范围具有重要的意义。
[Abstract]:The scale - like inorganic filler has the characteristics of parallel superposition in the coating, which can improve the density of the coating and the permeability of the medium. Glass scale (GF) is widely used in anticorrosive coatings because of its excellent chemical stability, antirust, alkali resistance, salt resistance, weatherability and so on. However, due to the significant difference between glass flake and polymer in chemical structure and physical form, their compatibility is poor, which seriously affects the anticorrosion performance of coatings. Therefore, the surface modification of glass flake filler has become a hot spot of research. In this study, glass flake between resin and poor compatibility problems, using -2,4- (TDI), toluene diisocyanate (HDI), six methylene diisocyanate (2,3- gamma epoxypropoxy) propyltrimethoxysilane (KH560) as active bridging agent, three kinds of glass flake surface activation grafting was prepared (GF-TDI, GF-HDI, GF-KH560). Grafting carboxyl terminated liquid nitrile rubber based on GF-TDI, GF-HDI and GF-KH560 (CTBN), the GF-g-CTBN composite materials were prepared by grafting; benzo triazole three on the basis of GF-TDI (BTA) and N N- (05FD), carbonyl imidazole two GF-TDI-BTA and GF-TDI-05FD two composite materials were prepared. The effect of grafting modification was characterized by Fu Liye infrared spectrometer (FTIR), scanning electron microscope (SEM) and X ray energy spectrometer (EDS). Ordinary glass flake and modified glass flake as filler and epoxy resin E44 as membrane material, NX2015 amine curing agent as curing agent to prepare epoxy varnish coating on the modified glass flake coating on the adhesion, chemical resistance, tensile shear, water absorption, impact resistance and other performance. The results showed that the characteristic peaks and C and N elements of organic glass appeared on the surface of grafted glass flakes. The surface morphology changed obviously. It was proved that the glass scales were successfully grafted on the surface of glass flakes. The modified glass scale has good compatibility with the resin, and it is dispersed evenly in the coating. Epoxy varnish coating adhesion, chemical resistance, tensile shear resistance, permeability, impact resistance and other properties are improved, the research on the preparation of modified glass flake filler to further improve the performance and longevity of anti-corrosion coatings, and expand the application range of glass flake filler has important significance.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TB306

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