提高石蜡产品光安定性技术研究

Study on Improving the Light Stability of Paraffin

石蜡主要由正构烷烃组成,还有少量的异构烷烃、环烷烃和芳香烃以及微量S、N、O的化合物。这些化合物以及芳烃、烯烃类物质中不稳定的组分,在紫外线和热的作用下,容易被氧化,导致石蜡的颜色变深,光安定性变差。为探究导致石蜡产品光安定性变差的原因,并提高石蜡产品的光安定性,分析了某石化公司62#石蜡的组成与性质,并运用控制变量的方法探究了提高石蜡产品光安定性的技术,以及光稳定剂和紫外光吸收剂类型、单剂用量、复配剂组成与添加量对石蜡产品光安定性及其他性能的影响。结果表明,当复配剂中紫外光吸收剂添加量为300μg/g、受阻胺类光稳定剂添加量为300μg/g,抗氧剂添加量为300μg/g时,石蜡产品的赛波特色号为24,其光稳定性最好。

Paraffin is mainly composed of n‑alkanes,small amounts of i‑alkanes,cycloalkanes,aromatic hydrocarbons and trace amounts of S,N,O compounds.Under the action of ultraviolet light and heat,those compounds containing elements S,N,O,aromatic and unstable elements of alkene aromatic can be oxidated,resulting in a darker color and lower paraffin light stability.In order to explore the reasons for the deterioration of the paraffin light stability,the effects of internal factors such as nitrates,sulfides and oil content on the paraffin light stability were investigated.Orthogonal experiments were carried out to investigate the effects of ultraviolet absorbers,hindered amine light stabilizers,antioxidants and its compounding agent on the improvement of the paraffin light stability.The results showed that the best paraffin light stability was achieved when the additive amounts of UV absorbers,hindered amine light stabilizers and antioxidants in the compound were 300μg/g,300μg/g and 300μg/g,respectively.