Study On The Synthesis Of Perfluoro-n-propyl Vinyl Ether

Polytetrafluoroethylene is widely used in aerospace,petrochemical,machinery,electronics,construction,textile and other industrial sectors.However,it has much disadvantages such as difficulty to dissolve,high melt viscosity,and difficulty in processing.At present,the methods of filling modification and surface modification have improved the shortcomings of PTFE in a certain leve,but there are still related problems.How to maintain the original performance of PTFE and eliminate its shortcomings is extremely challenging.Perfluoro-n-propyl vinyl ether(PPVE)is a fluorine-containing vinyl ether that can participate in the polymerization as a copolymerization or modification monomer,and can also effectively reduce the crystallization of copolymers based on tetrafluoroethylene(TFE)Degree.It is widely used in the synthesis of fluoropolymers.Therefore,this paper mainly studied the synthetic of preparing PPVE with hexafluoropropylene oxide(HFPO)as raw material.It includes a series of experiments including the oligomerization reaction,the decarboxylation reaction and experimental stability verification.After designed experiments,the conversion rate of HFPO in the oligomerization reaction can reach 94.4%,the selectivity of(HFPO)2 can reach 81.5%;the conversion rate of(HFPO)2 in the decarboxylation reaction can reach 83.8%,and the selectivity of PPVE can reach 91.5%.The overall process has a high conversion rate of raw materials,good product yield,mild reaction conditions,stable operation,and low cost.That is suitable for industrial production.This study opens up the process of preparing PPVE with HFPO as raw material,and provides important data support for industrialization.It extends the hexafluoro series product chain in China.