Shanghai zhongda science and technology development co . , ltd . a cross - regional high - tech enterprise , mainly depends on “ laboratory economy ” , its business covers photographic high molecular materials , multi - functional materials , biological and medical materials , textiles testing and other fields 上海中大科技发展有限公司是一家以“实验室经济”为依托的跨地区高新技术企业，业务覆盖感光性高分子材料、智能纺织品、生物医卫材料、纺织品检测等领域。
The gel by sodium alcoholate method , added benzoylacetone , have the obvious uv absorption peaks at 265nm and 337nm respectively . when the gel was placed in air , the chelate did n ' t have change . the absorption peak decreased until disappeared when the films were irradiated by the ultraviolet light with the relevant wavelength , which indicated that the films were obviously photosensitive ( 4 )通过三种方法制备感光性的sno _ 2 ： sb ( ato )溶胶，采用醇钠法，添加苯酰丙酮制备的二氧化锡凝胶膜，在265nm和337nm处存在明显吸收峰，空气中放置，所形成的螯合物不发生变化，用相应波长的紫外光照射时，这个吸收峰会减小直至消失，表明薄膜具有良好的感光性。
