水性涂料施工过程中微观结构的FTIR研究

以市售立邦水性涂料作为研究对象，溶剂水作为变量因子。配制不同水料比的涂料系列样品，分别用FTIR/ATR、FTIR/漫反射光谱表征湿料、涂膜的微观结构特征，湿料抽滤得到的固型物用FTIR/漫反射光谱表征。分析其官能团变化情况，研究施工过程，溶剂对涂膜的影响。结果显示：随着加水量的增加，湿料的FTIR/ATR光谱中，1 727 cm-1对应的羰基吸收峰，逐渐转为肩峰，871 cm-1吸收峰发生蓝移，峰强度逐渐减弱;涂膜的漫反射红外图谱，3 400 cm-1的—OH吸收峰、3 030 cm-1不饱和—CH吸收峰强度逐渐变弱，2 962和2871 cm-1的甲基和亚甲基的吸收峰强度逐渐增强，2 516 cm-1吸收峰位移至2 603 cm-1形成肩峰，1 647 cm-1吸收峰逐渐位移至1 455 cm-1，1 107 cm-1对应的C—O伸缩振动吸收峰发生红移。在水性涂料施工过程中，溶剂水与涂料分子间存在相互作用，对涂层分子中电子云的密度分布有显著的影响，此结果对涂料的生产及施工有参考意义。

IFTIR Study on the Micro-Structure in the Construction Process of Water-Borne Coatings

borne paint was studied in the article in which the solvent water was regarded as a variable factor. A series of paint samples with different percentage of water were configured before observing their storage performance and microstructures by using Fourier-transform infrared (FTIR) ATR (attenuated total reflection) spectroscopy and diffuse reflectance (DF) FTIR spectroscopy. The effects of construction process and solvent water on the coating film were examined through analyzing the changes of internal functional groups before and after coating. The results indicated that as the amount of solvent water was increased, the characteristic peak of ν_CO in 1 727 cm-1 turned into acromion, the absorption peak in 871 cm-1 was blue shifted, the intensity of the peak of hydroxyl (ν_OH) in 3 400 cm-1 and unsaturated absorption peak of ν_—CH in 3 030 cm-1 gradually weakened, the absorption peaks strengths of ν_—CH3 and ν_—CH2 in 2 962 and 2 871 cm-1 increased, respectively. The absorption peak in 2 516 cm-1 was shifted to 2 603 cm-1 then form the acromion, the absorption peak of 1 647 cm-1 gradually changed to 1 455 cm-1, the stretching vibration absorption peak of ν_C—O in 1 107 cm-1 was red-shifted. During the coating process of paint, the solvent water and paint molecules interacted with each other, having a significant impact on the electron cloud density distribution of the paint molecules. The results obtained in the article have an important significance for the production and construction of paint.