Preparation Of Nano-hybrid Fluorosilicone Resin For Touch Screen And Study On Coating Performance

In recent years,smart phones,tablet PCs and most of the electronic products have been achieved touch screen function.In the purchase time,consumers not only focus on the basic functions of the product and appearance,but also concerned about the product of the screen touch feeling and additional features,such as electronic products screen waterproof performance and anti-fouling performance.In order to realize the function of waterproof and anti-fouling of touch screen,this research has been carried out.Fluoroalkylsilanes can be subjected to hydrolysis polycondensation to prepare Si-OH groups terminated fluorosilicone resin oligomer,which not only improve the film-forming properties of fluorosilanes and increase the bond fastness between the resin and the glass substrate(with a large amount of Si-OH on the surface);If nanorough component is further chemically bonded fluorocarbon group during the hydrolysis of the silane so that it can greatly improve the hardness of the hydrophobic resin coating.At the same time,with the good film resistance and reactivity of the resin,the fixation of the nanoparticles on the substrate and other series of problems can be solved,and the treated glass surface has a durable water resistance and oil resistance.In view of this,In view of this,this paper used three kinds of fluorine-containing silicone as raw material to react respectively with orthosilicate(TEOS)under acidic conditions by hydrolysis co-polycondensation.A series of inorganic-organic hybrid fluorosilicone resins were prepared by combining the nanostructures with low surface energy fluorosilanes.(1)1H,2H,2H-perfluorooctyltriethoxysilane(POTS),ethyl orthosilicate(TEOS)and 1,2-bis(triethoxysilane)ethane(BTESE)were used to prepare hydrophobic and oleophobic nano-hybrid fluorosilicone resin(PFBR)by hydrolysis polycondensation under acidic conditions;PFBR was diluted with a good solvent to the application concentration to get PFBR-anti-fingerprint liquid,sprayed on the glass surface curing film to get PFBR-fingerprint coating.The performance of the coating was tested by UV-Vis spectrophotometer,thermogravimetric analyzer(TG),friction and wear tester.The results showed that when the application temperature of TFBR coating was 150 ℃,n(POTS): n(TEOS)was 4:10,the content of resin was 0.6% and the number of sprayed layers was 2,the thermal stability and transparency of the coating were good,the adhesion was strong and the hydrophobicity was the best,and the contact angle of water and oil reached respectively 121.6° and 101.7°.The surface morphology of the coating was observed by field emission scanning electron microscopy(SEM)and atomic force microscopy(AFM),the coating had a regular and rough micro-nanometer structure similar to that of the lotus leaf surface,which realized the organic combination of inorganic particles and low surface energy materials on the glass surface.(2)Tetramethylhydrogensiloxane(D4H),perfluorodecyl ethylene(PFOE)and vinyl triethoxysilane(VTES)were used to prepare a perfluoroalkyl substituted triethoxy reactive cyclic silane(PFD)through the hydrosilylation reaction with complex platinum as catalyst.Then PFD and TEOS as raw materials were used to prepare a nano-hybrid fluorosilicone(PFDR)by hydrolysis polycondensation under acidic conditions,the structure was characterized by IR and XRD.The PFDR resin was diluted according to the above-mentioned method and subjected to a coating treatment on the glass surface and the performance of the coating was tested.The results showed that when n(PFOE): n(VTES)was 3:5,n(PFD):n(TEOS)was 3:10,the resin content is 0.8%,the obtained coating had good thermal stability and transparency,strong adhesion and good hydrophobic oil repellency,and its water and oil contact angles were 120.3°and 87.5°.After SEM,AFM observation,the microstructure of the coating is rugged,regular continuous gully-like morphology(3)Hydrogen-containing hydrogen-containing silicone oil(PFHMS-0.23%)having a Si-H content of 0.23% was reacted with VTES by a hydrosilylation reaction to produce a triethoxy-substituted reactive fluorine Polysiloxane(PFV);Then PFV and TEOS as raw materials were used to prepare a nano-hybrid fluorosilicone(PFVR).The structure was characterized by IR,1H-NMR and XRD.The glass surface was subjected to a film formation treatment according to the method(1).The effects of different factors on the application of coating on the surface of the glass were investigated.The results showed that when n(PFV):n(TEOS)was 2:10,the content of PFVR was 0.3% and the coating layer was 1and so on,the prepared coatings had good thermal stability and transparency,excellent adhesion and hydrophobic and oleophobic properties,its water and oil contact angle reached 117.2° and 86.5°.After SEM,AFM observation,its coating surface showing smooth and uniform characteristics.