The Effects of Two Types of Silicone Resins on the Color Depth of Dyed Polyester

In the textile industry, the demand for high color depth, especially in dark shades, has always been a challenge among dyers. this is because during the dyeing process, the fabric reaches a saturation point, where adding too much dye not only doesn’t increase the depth, but also weakens the washing fastness. therefore, in the textile finishing section, color deepening agents are used to achieve high color depth. these materials generally contain resins with a refractive index of less than 1.5. when the fabric is immersed in these materials, in the first stage it is absorbed by the surface of the fabric and in the curing stage, a film layer forms on the surface of the fabric. the formed film has a lesser refractive index than the fabric, therefore it reduces the surface reflectance and as a result the amount of light transmitted into the fibers increases, which ultimately leads to an increase in the color depth of the textiles. among the materials with low refractive index are silicone resins. for this purpose, two types of silicone resins with different chemical structure were selected; poly diphenyl dimethyl siloxane with amino groups and poly dimethyl siloxane with amino groups. in this study polyester dyed with black dispersion dye was selected and then treated with the mentioned silicone resins. using calorimetric data, the depth of both fabrics was discussed.

The Effects of Two Types of Silicone Resins on The Color Depth of Dyed Polyester

In the textile industry, the demand for high color depth, especially in dark shades, has always been a challenge among dyers. This is because during the dyeing process, the fabric reaches a saturation point, where adding too much dye not only doesn’t increase the depth, but also weakens the washing fastness. Therefore, in the textile finishing section, color deepening agents are used to achieve high color depth. These materials generally contain resins with a refractive index of less than 1.5. When the fabric is immersed in these materials, in the first stage it is absorbed by the surface of the fabric and in the curing stage, a film layer forms on the surface of the fabric. The formed film has a lesser refractive index than the fabric, therefore it reduces the surface reflectance and as a result the amount of light transmitted into the fibers increases, which ultimately leads to an increase in the color depth of the textiles. Among the materials with low refractive index are silicone resins. For this purpose, two types of silicone resins with different chemical structure were selected; Poly diphenyl dimethyl siloxane with amino groups and poly dimethyl siloxane with amino groups. In this study polyester dyed with black dispersion dye was selected and then treated with the mentioned silicone resins. Using calorimetric data, the depth of both fabrics was discussed.