Study On Synthesis And Properties Of Fluorinated Release Agent

The fluorine release agent is a special polymer material that incorporates a fluorine-containing group in a polysilicone structure and can achieve efficient separation of the silicone material and the substrate.Fluorine release agent plays an irreplaceable role in the fields of electronic communications,transportation defense,military,etc.due to its ultra-low surface energy,high weather resistance and super wear resistance.At present,the fluorine release agent is monopolized by a few companies in Europe,America and Japan,which seriously restricts the development of China’s advanced manufacturing industry.In this project,special fluorine-containing groups were introduced into self-designed silicone polymers to obtain high-performance fluorine release agents,and their formulation design and synthesis process were systematically discussed.First,high hydrogen silicone oil(PMHS),octamethylcyclotetrasiloxane(C8H24O4Si4),and hexamethyldisiloxane(MM)were used to prepare low-hydrogen silicone oils with excellent optical properties and moderate viscosity.In this part,the influence of the type and amount of catalyst,reaction temperature,reaction time,theoretical hydrogen content and feeding process on the structure and properties of low-hydrogen silicone oil was discussed systematically,and the best process conditions and design formulae were obtained.The fluorine-containing polysiloxane is then synthesized by introducing a perfluoroalkyl group into the low-hydrogen silicone oil through a hydrosilylation reaction.The influence of the type and amount of catalyst,the reaction time,the reaction temperature and the molar ratio of the reactive groups on the structure and properties of the fluorinated polysiloxanes were systematically discussed,and the best process conditions were obtained.The effect of the change in the fluorine content of the fluoropolysiloxane on its thermal stability was discussed.Finally,fluorosilicone was used as the raw material to modify the solvent type,solution coating thickness,solution concentration,and fluorine content of the fluorine-containing polysiloxane,and the contact angle and release effect of the sample were tested.Release agent properties are discussed.The contact angles of deionized water and diiodomethane measured with a hydrogen-containing silicone oil having a hydrogen content of 1.20%and a fluorine-containing polysiloxane prepared with perfluorohexylethylene were 109.5° and 78.5°,respectively,and the surface tension decreased to 18.91 mN/m.