In May 2003, at the annual meeting of AATCC (American Association of Textile Chemists and Dyers), the new standard of AATCCTMl6 sunlight fastness was officially adopted. The eco-textile color fastness standard also increases the sunlight fastness. In the context of new requirements and standards for sunlight fastness at home and abroad, our textile enterprises must understand and master the factors affecting sunlight fastness to ensure product quality. The characteristics of reactive dyestuff are discussed and the factors affecting the sunlight fastness of its finishing fabrics are analyzed.
Ci3000+ Xenon lamp aging test chamber to evaluate the effect of light on dyestuff
ATLAS Ci3000+Xenon lamp aging test chamber adopts water-cooled xenon lamp, simulating natural sunlight to evaluate the textile weathering aging, digital control system, further upgrade the Ci3000 series, before Ci3000 series has obtained CE, UL, CAS, ISO and EN and other international standard organizations certification, Shanghai Qianshui precision Ltd. can be the agent, welcome customers with demand for timely telephone inquiries.
Ci3000+ Xenon lamp aging test chamber to assess the effect of light on dyes
In addition, QINSUN instrument technical engineer said, in the process of solarization, light on the dyes produce the following effects.
(1) For the structure of the dye, under the action of ultraviolet light, the chemical bonds in the dye change or even break, so that the structure of the color-emitting group and the color-assisting group in the dye is destroyed, thus losing its color; it may also change the three-dimensional structure of the dye under ultraviolet light, resulting in color changes and performance * change;
(2) explained by the electronic structure and its energy change in the dye molecule, in dyes, the color-emitting groups mostly belong to the electron-giving and electron-accepting chromophores, which have the same characteristics that the bond-forming electrons in the conjugated double bond gain energy and leap to the higher energy anti-bond orbitals. When the bonding electron returns to the original bonding orbital, it will give off energy, resulting in a different color. Under visible light irradiation, the bonding electron can only leap to the lower antibonding orbital due to the small energy it has gained. This jumping will produce different colors depending on the conjugation system. When irradiated by a large amount of UV light with higher energy (x<400 nm), some of the bonding electrons can gain higher energy and jump to the antibonding orbitals at higher energy levels, or electrons in the lower energy bonding orbitals jump to the antibonding orbitals. When these electrons return to their original orbitals, they release a different energy and exhibit a different color than the original, thus exhibiting a different sunlight fastness.
QINSUN instrument is a professional manufacturer of Xenon lamp aging test chamber, our engineers said, sunlight fastness refers to the textile color in the process of taking the resistance of sunlight effect. At present, the textile sunlight resistance color fastness more and more international attention, most of the national textile industry, many product standards will be sunlight resistance color fastness as an important assessment index. Such as the 2003 promulgation of FZ/T43017-2003, has been stretch silk sunlight fastness as an assessment index. Chemical fiber silk fabrics and cotton products standards will also be sunlight fastness as an important assessment index, in order to strengthen the requirements of the textile light fastness testing.