Study on effect of MTMS modification on weatherability of SiO2 anti-reflective coating
SiO2 anti-reflective coating solution was prepared by acid-catalyzed method using tetraethyl orthosilicate(TEOS)as precursor and methyltrimethoxysilane(MTMS)as modifier.The film was coated on the glass substrate by dip coating method and curing treated by the muffle furnace,the water and wear resistance test were carried out by condensate test chamber and TABER abrasion meter,also the effect of MTMS addition on the transmittance and weatherability of the coat-ing was studied.The results showed that appropriate amount of MTMS could improve the transmittance of SiO2 anti-reflec-tive coating.When n(MTMS)/n(TEOS)=0.5,the anti-reflection property was increased by 11.5%from 5.2%to 5.8%,but the anti-reflection property was decreased with the increase of MTMS.The addition of MTMS also improved the water resis-tance of SiO2 film to a large extent.When n(MTMS)/n(TEOS)≥1,the condensate test of 500 h had little effect on the sur-face and transmittance of the film.With the gradual increase of MTMS addition,the wear resistance of the film would gradu-ally increase.When n(MTMS)/n(TEOS)=2,the increase in transmittance of the film after 100 cycles of friction was only re-duced by 10%.Compared with the film without MTMS,its wear resistance had been greatly improved.
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