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聚氨酯已广泛用于泡沫塑料、涂料、油墨,绝缘材料和粘合剂等工业。其主要原料异氰酸酯单体具有毒性,从环境保护和提高产品质量角度要求聚氨酯预聚物中游离单体含量不超过1％。测定游离单体含量的方法有很多,其中气相色谱法由于汽化温度和柱温高,易使预聚物降解,结果偏高失真;ASTM法手续繁杂,适应性差。本工作建立了高效液相色谱法(HPLC)测定聚氨酯预聚物中游离甲苯二异氰酸酯(TDI)含量。并用以跟踪预聚物形成反应历程,控制产品
Polyurethanes are widely used in industries such as foams, coatings, inks, insulating materials and adhesives. The main raw material isocyanates monomer toxicity, environmental protection and improve product quality requirements of the polyurethane prepolymer free monomer content does not exceed 1%. There are many ways to determine the content of free monomer, which due to the vaporization temperature and column temperature gas chromatography, easy to prepolymer degradation, resulting in high distortion; ASTM method complicated, poor adaptability. This work established a method for the determination of free toluene diisocyanate (TDI) in polyurethane prepolymers by high performance liquid chromatography (HPLC). And used to track prepolymer formation reaction process, control the product