Color contact lenses currently on the market use commercial coloring pigments that cause reduction of the oxygen transmissibility, water content, and ultraviolet-block, which may result in various eye diseases such as the dry eye syndrome, keratitis, and so forth. To minimize such side effects, nece...
Color contact lenses currently on the market use commercial coloring pigments that cause reduction of the oxygen transmissibility, water content, and ultraviolet-block, which may result in various eye diseases such as the dry eye syndrome, keratitis, and so forth. To minimize such side effects, necessary is the study on lenses that adopt natural dyes with ultraviolet-block effects and better oxygen transmissibility. Thus, this study aims to confirm the extraction time of each extractant and extraction effects at certain extraction temperature in use of domestic plants for natural dyes such as Gardenia Jasminoides, Sophorae Flos, Gallnut, Gromwell, and Amur Cork Tree, examine the color and surface changes during the lens dyeing process with the purified extracts as the mordant in application of the optimal extraction conditions, and measure the light, abrasion, and fastness of the lens washing agents through the fastness test. In addition, measured are the ultraviolet-block, water content, and oxygen transmissibility of the contact lenses manufactured in the way specified above for the analysis on the usability as a substitution dye for synthetic dyes in comparison with lenses that adopt existing synthetic dyes. The experiment process of this study is as follows: First, for the preliminary experiment in selecting proper solvents, the solvents(Distilled water, Methanol, Ethyl Ether, Ethanol, Acetone, and Benzene) were applied to Gardenia Jasminoides to compare the absorbance, and excellent solvents were selected. Second, the changes in the dye condition depending on the temperature were observed to confirm the ideal extraction temperature. Third, The extraction proceeded with the selected solvents at the proper extraction temperature in different time conditions(1 to 12 hours) to comparitively analyze the absorbance and confirm the ideal condition for extraction. Fourth, the extracts produced in the proper condition went through the purification and dyeing process with the mordants(Iron(Ⅱ)Chloride, Iron(Ⅲ)Chloride, Aluminum Chloride, Aluminum Sulfate, and Alum) on the manufactured contact lenses to compare the color and surface condition. A fastness test was conducted to confirm the fastness of lens washing agents, light, and abrasion. The ultraviolet-block, water content, and oxygen transmissibility of the manufactured content lenses were measured for the comparison with the lenses dyed with existing synthetic dyes. The results show that as for solvents, methanol and distilled water were the best in terms of absorbance of the extracted Gardenia Jasminoides solution, and that as to the relation between temperature and changes in each dye condition, the first weight change was observed as the temperature went down to some 80℃. Thus, the following experiments adopted the two solvents and were conducted at 80℃ or under - 45℃, 55℃, and 65℃. As a result of the application to the five natural dyes, it turned out that the best result was gained when Methanol was used as the solvent and the extraction was implemented at 65℃. As for Sophorae Flos, the best result was gained as the extraction continued for 6 hours. As to the color changes when the dye solutions extracted in the optimal condition were purified and the lenses were dyed with the five mordants, Gardenia Jasminoides all turned blue, while Sophorae Flos and Amur Cork Tree turned brown with Fe mordants and yellow with Al mordants. Gallnut and Gromwell turned violet with Fe mordants and showed another color with Al mordants. As to the surface condition, Sophorae Flos, Gromwell, and Amur Cork Tree all showed the good condition of the surface while Gardenia Jasminoides showed the best surface condition when processed with ferrous chloride. Gallnut showed somewhat rough surface conditions when processed with ferrous chloride and aluminium chloride. In the fastness test, Gallnut, Gromwell, and Amur Cork Tree showed different fastness respectively depending on the mordant and mordant time. Gardenia Jasminoides and Sophorae Flos showed the fastness as long as 100 hours depending on the mordant and mordant time, which proves the excellent fastness for contact lenses. As a result of examining the characteristics of the contact lenses manufactured as above, the water content of the contact lenses manufactured 6 times as thin as those colored with a synthetic dye was 36.5~39% although the ultraviolet-block was 31~67%(UV-B) lower than that of synthetic dyes and the oxygen transmissibility did not reach the general level - 10Dk. Thus, it is thought that the future study needs to address these issues stated above.
Color contact lenses currently on the market use commercial coloring pigments that cause reduction of the oxygen transmissibility, water content, and ultraviolet-block, which may result in various eye diseases such as the dry eye syndrome, keratitis, and so forth. To minimize such side effects, necessary is the study on lenses that adopt natural dyes with ultraviolet-block effects and better oxygen transmissibility. Thus, this study aims to confirm the extraction time of each extractant and extraction effects at certain extraction temperature in use of domestic plants for natural dyes such as Gardenia Jasminoides, Sophorae Flos, Gallnut, Gromwell, and Amur Cork Tree, examine the color and surface changes during the lens dyeing process with the purified extracts as the mordant in application of the optimal extraction conditions, and measure the light, abrasion, and fastness of the lens washing agents through the fastness test. In addition, measured are the ultraviolet-block, water content, and oxygen transmissibility of the contact lenses manufactured in the way specified above for the analysis on the usability as a substitution dye for synthetic dyes in comparison with lenses that adopt existing synthetic dyes. The experiment process of this study is as follows: First, for the preliminary experiment in selecting proper solvents, the solvents(Distilled water, Methanol, Ethyl Ether, Ethanol, Acetone, and Benzene) were applied to Gardenia Jasminoides to compare the absorbance, and excellent solvents were selected. Second, the changes in the dye condition depending on the temperature were observed to confirm the ideal extraction temperature. Third, The extraction proceeded with the selected solvents at the proper extraction temperature in different time conditions(1 to 12 hours) to comparitively analyze the absorbance and confirm the ideal condition for extraction. Fourth, the extracts produced in the proper condition went through the purification and dyeing process with the mordants(Iron(Ⅱ)Chloride, Iron(Ⅲ)Chloride, Aluminum Chloride, Aluminum Sulfate, and Alum) on the manufactured contact lenses to compare the color and surface condition. A fastness test was conducted to confirm the fastness of lens washing agents, light, and abrasion. The ultraviolet-block, water content, and oxygen transmissibility of the manufactured content lenses were measured for the comparison with the lenses dyed with existing synthetic dyes. The results show that as for solvents, methanol and distilled water were the best in terms of absorbance of the extracted Gardenia Jasminoides solution, and that as to the relation between temperature and changes in each dye condition, the first weight change was observed as the temperature went down to some 80℃. Thus, the following experiments adopted the two solvents and were conducted at 80℃ or under - 45℃, 55℃, and 65℃. As a result of the application to the five natural dyes, it turned out that the best result was gained when Methanol was used as the solvent and the extraction was implemented at 65℃. As for Sophorae Flos, the best result was gained as the extraction continued for 6 hours. As to the color changes when the dye solutions extracted in the optimal condition were purified and the lenses were dyed with the five mordants, Gardenia Jasminoides all turned blue, while Sophorae Flos and Amur Cork Tree turned brown with Fe mordants and yellow with Al mordants. Gallnut and Gromwell turned violet with Fe mordants and showed another color with Al mordants. As to the surface condition, Sophorae Flos, Gromwell, and Amur Cork Tree all showed the good condition of the surface while Gardenia Jasminoides showed the best surface condition when processed with ferrous chloride. Gallnut showed somewhat rough surface conditions when processed with ferrous chloride and aluminium chloride. In the fastness test, Gallnut, Gromwell, and Amur Cork Tree showed different fastness respectively depending on the mordant and mordant time. Gardenia Jasminoides and Sophorae Flos showed the fastness as long as 100 hours depending on the mordant and mordant time, which proves the excellent fastness for contact lenses. As a result of examining the characteristics of the contact lenses manufactured as above, the water content of the contact lenses manufactured 6 times as thin as those colored with a synthetic dye was 36.5~39% although the ultraviolet-block was 31~67%(UV-B) lower than that of synthetic dyes and the oxygen transmissibility did not reach the general level - 10Dk. Thus, it is thought that the future study needs to address these issues stated above.
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