What is the deepening mechanism of silicone oil(i)

In recent years, customers have increasingly higher requirements for the color depth of dark fabrics (especially reactive black, vulcanized black, and dispersed black). At present, dyeing factories mainly use two methods to deepen the fabric's extra-dark colors: one is to cationically modify the surface of the fabric to make the cationic fibers and anionic dyes more adsorbent and improve the dye uptake rate and dye absorption rate of the fabric. Fixation rate, so as to achieve the purpose of dyeing a darker color; second, use optical principles to change human vision, so as to achieve the purpose of making the dye appear darker.

Deepening silicone oil is to cover the surface of the fabric with a layer of organic matter with a low refractive index, weakening the fabric's ability to reflect and scatter light, and using optical principles to change human vision. After treatment, the dyeing will be visually deepened by 30 to 50%. Its use The method is simple (using the setting machine tank) and the effect is obvious. Especially for the black products currently used in many dyeing factories, it is widely used.

1.1 Cationic modification of fibers

The fabrics that need to be treated are first cationically modified to change the electronegativity of the fabric surface and create a stronger adsorption force between the fiber and the dye. The cationic modification of the fiber is to cationize the fiber and combine it with the anionic dye more efficiently. Firm, thereby achieving the purpose of improving the dye uptake rate and color fixation rate and increasing the color depth.

Substances that can modify fibers can be divided into two categories: organometallic compounds and nitrogen-containing cationic compounds; one is a polyvalent metal salt, which has electrostatic attraction and complexation with the fiber; the other is a nitrogen-containing cationic compound, which can interact with the fibers. Reactive groups form covalent bonds.

1.2 Using optical principles to change human vision

After the fabric is treated, a layer of low refractive index film is formed on the surface of the fiber, which changes the absorption, reflection, and refraction of light by the fiber, and uses optical principles to change human vision, thereby obtaining the effect of darker color to the naked eye. Currently, the most commonly used one is Resins and silicones, darkening silicone oil is an environmentally friendly special silicone compound, suitable for deepening and brightening finishing after dyeing with reactive dyes, disperse dyes, sulfur dyes, direct dyes, etc. or after washing garments.

Without adding dye, after the fabric is treated with deepened silicone oil, a thin film will be formed on the surface of the fabric, which changes the reflection and absorption of light. The total surface reflected light of the fabric is less than the total area reflected light before finishing, which is reflected in To the human eye, the color of fabric appears to be darker to the naked eye. Using darkening silicone oil to treat dyed fabrics can not only deepen the color of dyed products, reduce the amount of dye used, and reduce production costs, but also reduce the content of colored substances in sewage and reduce the pressure on dyeing plants to treat sewage. This article focuses on the black fabrics on the market (sulfurized black-dyed cotton and dispersed black-dyed polyester). The use of darkening silicone oil has its necessity and significance.

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