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采用一阶导数紫外光谱法考察了松香、酚醛树脂、松香基酚醛树脂及其混合物的紫外光谱特征,建立了在无水乙醇中的定量分析方法,跟踪测定了松香与酚醛树脂反应过程的松香变化。结果表明,在257 nm处,松香的吸光度对波长的一阶导数绝对值较大,而酚醛树脂和松香基酚醛树脂为0,利用建立松香物质的量浓度与吸光度一阶导数的定量分析方法跟踪反应过程,能消除酚醛树脂和松香基酚醛树脂的影响。松香吸光度一阶导数绝对值Y与物质的量浓度C定量分析方程为Y=0.009 2C+0.000 90(C的取值为0.50×10-5~5.0×10-5mol/L),方法的回收率为97.05%~101.33%,精密度、稳定性和回收率的RSD分别为3.37%,2.60%和2.36%。采用该方法测定反应过程,发现反应2 h后松香和酚醛树脂基本完成,与实际工艺设定的反应终点时间一致。
The first-order derivative UV spectroscopy was used to investigate the UV spectra of rosin, phenolic resin, rosin-based phenolic resin and their mixtures. A quantitative analytical method was established for the determination of rosin, rosin in the reaction of rosin and phenolic resin . The results showed that at 257 nm, the absolute value of the first derivative of the absorbance of rosin to the wavelength was larger than that of the phenolic resin and the rosin-based phenolic resin, followed by a quantitative analysis using the first derivative of the rosin content and absorbance The reaction process eliminates the effects of phenolic and rosin-based phenolic resins. Rosin absorbance first derivative of the absolute value of Y and the amount of substance concentration C quantitative analysis equation Y = 0.009 2C + 0.000 90 (C value of 0.50 × 10-5 ~ 5.0 × 10-5mol / L), the recovery rate of the method Of 97.05% ~ 101.33%. The RSD of precision, stability and recovery were 3.37%, 2.60% and 2.36%, respectively. The method was used to determine the reaction process. It was found that the rosin and phenolic resin were basically completed after 2 hours of reaction, which was consistent with the actual reaction time set in the process.