高稳定性甲基橙的室温合成及其性能研究

Preparation of highly stable methyl orange at room temperature and its properties characterization

合成稳定性良好的甲基橙对纺织物的色牢度具有重要的意义,本研究通过改进实验室低温两步合成甲基橙的方法,在室温下混合氨基苯磺酸、亚硝酸钠与N,N-二甲基苯胺进行一步反应,合成甲基橙.所制备的甲基橙经过紫外光谱、红外光谱和热重分析表征,结果表明,其共轭程度和稳定性比低温下合成的和商用的甲基橙要高.抗光催化降解测试表明,相比于低温合成的和商用的甲基橙,室温下合成的甲基橙经150 min降解后,可见光吸光度最高,橙色保持得最深.通过耐酸/碱、耐高温、耐紫外线辐射和抗金属离子的稳定性测试表明,室温下合成的甲基橙均具有良好的稳定性,高稳定性的甲基橙有助获得牢固、稳定的染料.

Stable methyl orange dyes play an important role in obtaining higher quality color for textile.In this paper,we modified the laboratory two-step synthesis method and developed one-step method for preparing the methyl orange dye by aggregation of p-aminobenzenesulfonic acid,sodium nitrite,and N,N-dimethylaniline at room temperature instead of low-temperature synthesis method.The methyl orange obtained at room temperature was characterized by UV spectrum,Fourier's infrared spectrum,and thermogravimetric analysis.The results show that the methyl orange has higher in conjugate degree and stability than those of methyl orange obtained at low temperature and commercial sample.Photocatalytic degradation tests show that the methyl orange obtained at room temperature remains higher absorption intensity and color depth than those of methyl orange obtained at low temperature and commercial sample after 150 min.The high stability of methyl orange obtained at room temperature also demonstrated by the resistant tests in acid/alkali solution,high-temperature condition,ultraviolet radiation and metal ion existence,respectively.The highly stable methyl orange helps to develop high-quality and stable dyes.