5results about How to "Improve light fastness" patented technology

The invention provides a phthalocyanine sulfonamide derivative dye as well as a preparation method and application thereof, and belongs to the technical field of phthalocyanine series dyes. The structural general formula of the phthalocyanine sulfonamide derivative dye is (PC)-(SO2-N-X) z-(SO3R) y, PC is a phthalocyanine or metal phthalocyanine group, X is hydrogen, C1-C14 alkyl, hydroxyalkyl, aralkyl or aromatic group, R is hydrogen, C1-C4 alkyl or amine salt cation, the value range of z is 1-4, the value range of y is 1-3, and the sum of z and y is less than or equal to 4. According to the invention, the sulfonamide group and the sulfonic acid group are introduced at the same time, so that the prepared derivative dye has excellent organic solvent solubility and water solubility, and the problem of single solubility of the traditional zinc phthalocyanine dye is effectively solved.

The invention discloses a light fastness improver for an acid dye as well as a preparation method and application of the light fastness improver. The light fastness improver is prepared from the following components in parts by mass: 30 to 72 parts of benzotriazole or triazine ultraviolet absorbent; 5-25 parts of a dispersant; 1-6 parts of a solvent; and the balance of water. The preparation method comprises the following steps: firstly, uniformly mixing the dispersing agent, the solvent and the water, adding the mixture into the ultraviolet absorbent, putting the mixture into a mixing kettle or a grinding machine, and stirring and mixing for 0.5-2 hours or grinding for 4-8 hours at room temperature to prepare the light fastness improving agent. The light fastness improver disclosed by the invention is attached and permeated on a fabric for dyeing an acid dye through a dyeing one-bath method or a padding method, so that the light fastness of the fabric is obviously improved. And after treatment, the influence on after-finishing processing is small.

This invention provides a method for dyeing with vat dyes in an overflow dyeing machine. The use of a dye premix significantly improves dyeing performance. The cationic properties of modified cationic starch electrostatically adsorb onto fabric fibers, allowing the coated dye particles to quickly and evenly adhere to the fabric surface. This avoids localized color differences caused by uneven dye dispersion in the dye bath, and the water flow impact in overflow dyeing prevents localized dye aggregation, effectively improving dyeing uniformity and ensuring consistent dyeing results for the same batch of fabrics. The stable structure formed by the cross-linking of modified cationic starch and vat dye forms a protective film on the fabric fiber surface after color fixation, enhancing the binding stability between the dye and fiber, reducing damage to dye molecules from external factors such as light, improving the dye's lightfastness and the fabric's sunlight fastness. Its film-forming properties also make the dye and fiber bond more firmly, preventing fading.

The application discloses a plant dye dyeing method for improving the sunlight fastness of cashmere / wool fabric, which comprises the following steps: (1) dyeing cashmere / wool fabric by using plant dyes; (2) mordanting the dyed cashmere / wool fabric in a mixed solution of ferrous sulfate and gallnut, taking out after mordanting, and washing clean; (3) soaping the mordanted cashmere / wool fabric, washing clean after soaping, and drying. After the cashmere / wool fabric is dyed by using plant extract, the dyed cashmere / wool fabric is immersed in a mixed solution of ferrous sulfate and gallnut, so that the ferrous sulfate and the gallnut form hydrogen bonds and coordination bonds with cashmere / wool fibers and plant pigments, thereby improving the sunlight fastness of the cashmere / wool fabric.

This invention discloses a school uniform fabric with moisture-wicking, quick-drying, antibacterial, and UV-protective functions, and its preparation method. The school uniform fabric is a weft-knitted plain weave fabric with a low-twist, high-proportion cotton blended yarn as the ground yarn and a high-twist, low-proportion cotton blended yarn as the face yarn. The reverse side of the low-twist, high-proportion cotton blended yarn, woven in loops, serves as a skin-friendly, moisture-wicking, antibacterial, and soft layer. The front side of the high-twist, low-proportion cotton blended yarn, woven in loops, serves as a quick-drying, UV-protective, and crisp layer. The low-twist, high-proportion cotton blended yarn is prepared by Siro compact spinning of cotton fibers, modified polyester antibacterial Supercool fibers, and modified polyester moisture-wicking, quick-drying Supercool fibers. The high-twist, low-proportion cotton blended yarn is prepared by Siro compact spinning of cotton fibers, modified polyester moisture-wicking, quick-drying Supercool fibers, and modified polyester UV-resistant Supercool fibers. The twist coefficient of the former is smaller than that of the latter, and the mass percentage content of cotton fibers in the former is greater than that in the latter.