Synthesis And Application Of Biobased Plasticizer Dibutylfuran-2,5-dicarboxylate Synthesis

Since the plastics were synthesized in the early 20th century,plastics have gradually become an indispensable commodity for human life with constant research and improvement.Plastics are widely used because of their low cost,light weight,and excellent performance.However,the excellent processing properties of plastics and the wide application value are closely related to the use of plastic additives.As one of the most important plastic additives,plasticizers are widely used in the plastics industry.Over the past two decades,traditional ophthalmic plasticizers have been used in the world which account for more than 80%of the market share.The phthalic plasticizers are made from non-renewable petroleum,and many countries have introduced many laws and regulations to restrict the use of phthalic plasticizers.So the development of environmentally friendly and raw material-renewable plasticizers to replace traditional phthalic plasticizers has become a trend in the future.In the study,2,5-furandicarboxylic acid（FDCA）and dimethyl furan-2,5-dicarboxylate（DMF）and n-butanol as raw materials were used to prepare biobased plasticizer Dibutylfuran-2,5-dicarboxylate（DBF）by direct esterification and transesterification.The reaction conditions of the two methods were optimized by response surface analysis（RSM）and the optimal reaction conditions were obtained.Plasticizers were additionally prepared for performance studies.The following conclusions are obtained by the experiment:（1）:For the preparation of DBF by direct esterification of FDCA and n-butanol with concentrated sulfuric acid.The effects of reaction temperature,reaction time,catalyst dosage on the yield of DBF was determined by the single factor experiment,the reaction temperature is 90?C,the catalyst concentration is 3%,the reaction time is 6h.（2）:For the preparation of DBF by Potassium carbonate catalyzed DMF and n-butanol transesterification,the effect of catalyst concentration,reaction time,and reaction temperature on the yield of DBF was determined by single factor effect experiments.On the basis of single factor tests,response surface methodology（RSM）was used to design optimized experiments with three factors and three levels.The optimal reaction conditions were obtained:the reaction temperature is90?C,the catalyst dosage is 4%,the reaction time is 76.05min.（3）:The chemical structure of DBF was characterized by FT-IR,¹³C NMR and ¹H NMR.It was applied to polyvinyl chloride（PVC）was investigated using thermogravimetric（TGA）,Differential Scanning calorimeter（DSC）,as well as the volatility and migration of the blends.The results show that the addition of DBF reduces the glass transition temperature（Tg）of the blend,and has a good plasticizing effect on PVC.