Production classification of fluorescent fabrics

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fluorescent fabric fluorescent cloth

Fluorescent dyes: generally refer to dyes that can strongly absorb and radiate fluorescence in the visible light range. The application of fluorescent dyes in textiles mainly includes the following three aspects: 1. Fluorescent whitening agent; 2. Dispersed fluorescent dyes; 3. Fluorescent coatings. This article will introduce in detail the application of fluorescent dyes and the use and harm of fluorescent fabrics. Principle of fluorescent fabric production: Fluorescence is a phenomenon in which light causes luminescence. When ultraviolet light, or some kind of light, irradiates a fluorescent substance, the substance will absorb energy consistent with its characteristic frequency, transition from the ground state to an excited state with higher energy, etc. Molecules in an unstable excited state will transfer and relax to a lower vibrational energy level of the excited state in a short period of time, balance the excited state, and then fall back to a higher vibrational energy level of the ground state. In the process of falling back, the energy is attenuated in the form of fluorescence, and the fluorescence disappears when the irradiation is stopped. Fluorescent whitening agents: Fluorescent whitening agents have been widely used in textiles, papermaking, washing powder, soap, rubber, plastics, pigments and paints, etc. Dispersed fluorescent dyes: Dispersed fluorescent dyes have small molecules and do not contain water-soluble groups in their structure. They are uniformly dispersed into the fibers in the dye liquor with the help of the dispersant. After padding in the dyeing solution, it is dried immediately and then hot-melted. Under the action of high temperature, the dye deposited on the fabric can diffuse into the fiber in the form of single molecules, completing the dyeing of the chemical fiber in a very short time. Since the small molecules of fluorescent dyes are fused with the fibers, the color fastness to rubbing and washing of the fabric is very good, but the color fastness to light is poor. Fluorescent paint: 1. Fluorescent paint is a slurry composed of fluorescent pigments, dispersants and wetting agents. It is insoluble in water and has no affinity for fibers. It cannot be dyed according to the dyeing conditions of conventional dyes. 2. If the fluorescent pigment particles are large, the coloring rate is low, the color is dim, the fastness is poor, and the color is not easy to be accurate; if the particles are small, the coloring rate is high and the fastness is good, but the brightness is affected. 3. The fluorescent paint is padded and then attached to the surface of the fiber, and then the resin component of the adhesive is used to help the paint fixate on the surface of the fiber to achieve a certain dyeing fastness. The fabric will feel stiff due to the influence of the resin contained in the adhesive.
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