Photostabilization of organic thermochromic pigments: Action of benzotriazole type UV absorbers bearing an amphoteric counter-ion moiety on the light fastness of color formers

2008 ◽  
Vol 76 (1) ◽  
pp. 270-276 ◽  
Author(s):  
Hironori Oda
Keyword(s):  
Light Fastness ◽  
Counter Ion ◽  
Uv Absorbers

Effects of UV absorbers and reducing agents on light fastness of cotton fabrics pre-dyed with sodium copper chlorophyllin and gardenia yellow

2020 ◽  
Vol 90 (19-20) ◽  
pp. 2245-2257
Author(s):  
Zhong Zhao ◽  
Mingwen Zhang ◽  
Chris Hurren ◽  
Liming Zhou ◽  
Jihong Wu ◽  
...  
Keyword(s):  
Sodium Citrate ◽  
Cotton Fabrics ◽  
Reducing Agents ◽  
Simulated Sunlight ◽  
Light Fastness ◽  
Sunlight Irradiation ◽  
Uv Absorbers ◽  
Dyed Fabrics ◽  
Sodium Copper Chlorophyllin ◽  
Inorganic And Organic

In this study, inorganic and organic UV absorbers, as well as reducing agents, were employed to treat cotton fabrics that were pre-dyed with two natural dyes (sodium copper chlorophyllin and gardenia yellow) to improve light fastness. The performance of UV absorbers and reducing agents was evaluated by comparing ΔE (CIELAB) of the treated samples caused by their exposure to simulated sunlight irradiation. Results show that both inorganic and organic UV absorbers present unsatisfactory effects on inhibiting the photo-fading of dyes, while the reducing agents (i.e. sodium citrate and glucose) exhibit distinctive effects on improving their light fastness. The protection was enhanced when the amount of the two reducing agents was increased from 1% to 5% o.w.f. Sodium citrate was found to be more efficient than glucose in this regard. Change in shade of gardenia yellow and sodium copper chlorophyllin pre-dyed fabrics with a treatment of 5% o.w.f. sodium citrate after 10 h exposure to simulated sunlight were ΔE 3.95 and 2.46, while for the controls were ΔE 10.34 and 8.11, respectively.

Synthesis, Characterization, and Dyeing Performance of UV Protective Mono Azo Acid Dyes Based on 4-Hydroxybenzophenone

2020 ◽  
Vol 7 (2) ◽  
pp. 19-26
Author(s):  
Smita Bait ◽  
Suvidha Shinde ◽  
Ravindra Adivarekar ◽  
Sekar Nagaiyan Nethi
Keyword(s):  
Diazonium Salt ◽  
Acid Dyes ◽  
Light Fastness ◽  
Protection Factor ◽  
Ultraviolet Protection Factor ◽  
Dyeing Performance ◽  
Uv Absorbers ◽  
Functional Dyes ◽  
Silk Fabrics ◽  
Dyed Fabric

A key element in reducing human UV exposure is making proper UV protective goods with good ultraviolet protection factor (UPF) protection. The current research is focused on the synthesis of UV-protective functional dyes containing benzophenone-based UV absorbers and its application on wool and silk fabrics. Novel mono azo acid dyes were synthesized by the coupling of diazonium salt solutions of different aromatic amines with 4-hydroxybenzophenone, and these were applied on wool and silk. The fabrics dyed with the synthesized dyes showed less than 5% UVA and UVB transmission, indicating good protection against UV radiation. Dyed fabric also gave good to excellent washing, rubbing, and light fastness, and UV protection properties, even after ten washing cycles.

Development of UV absorbers for sun protective fabrics

2011 ◽  
Vol 81 (20) ◽  
pp. 2139-2148 ◽  
Author(s):  
Hironori Oda
Keyword(s):  
Singlet Oxygen ◽  
Uv Light ◽  
Light Fastness ◽  
Methyl Derivative ◽  
Combined Use ◽  
Singlet Oxygen Quencher ◽  
Uv Absorbers ◽  
Ultraviolet Protection ◽  
Protective Fabrics ◽  
Very High

The textiles for protection against harmful UV radiation have become the focus of great interest in the present time. However, not all apparel is well-protected against UV light. Therefore, the application and improvement of UV absorbers for sun protective fabrics is being sought. In this study, various benzophenone UV absorbers containing benzotoriazolyl groups were prepared, and the Ultraviolet Protection Factors (UPF) and improving the light fastness of dyes was examined. A series of hydroxybenzophenones bearing a built-in benzotriazole moiety showed a very high UPF, and played a very important role in the improvement of light fastness of dyes. It was found that 2,2’,4,4’-tetrahydroxy-5,5’-dibenzotriazolylbenzophenonesulfonic acid or the methyl derivative shows very high UPF, and plays an important role in improving the light fastness of dyes. It was further demonstrated that the combined use of these UV absorbers and singlet oxygen quencher, NTS (Nickel p-toluenesulfonate), can be applied as effective stabilizers against the photofading of dyes.

The Temperature and Counter-ion Dependency of Cation Exchange Equilibria

1960 ◽  
Vol 25 (1_2) ◽  
pp. 81-89 ◽  
Author(s):  
O. D. Bonner ◽  
G. Dickel ◽  
H. Brümmer
Keyword(s):  
Cation Exchange ◽  
Counter Ion

Simple Modification Measurement of Photodegradability of Polymers by using Photo-induced Chemiluminescence Technique

2013 ◽  
Vol 10 (2) ◽  
pp. 51
Author(s):  
Siti Farhana Zakaria ◽  
Keith R Millington
Keyword(s):  
Free Radicals ◽  
Organic Materials ◽  
Oxidative Degradation ◽  
Working Life ◽  
Bimolecular Reaction ◽  
Synthetic Polymers ◽  
Accelerated Weathering ◽  
Simple Modification ◽  
Uv Absorbers ◽  
Irradiation Period

Polymers and organic materials that are exposed to sunlight undergo photooxidation, which leads to deterioration of their physical properties. To allow adequate performance under outdoor conditions, synthetic polymers require additives such as antioxidants and UV absorbers. A major problem with optimising polymer formulations to maximise their working life span is that accelerated weathering tests are empirical. The conditions differ significantly from real weathering situations, and samples require lengthy irradiation period. Degradation may not be apparent in the early stages of exposure, although this is when products such as hydroperoxides are formed which later cause acceleration of oxidation. A simple way of quantifying the number of free radicals presents in organic materials following exposure to light or heat is by measuring chemiluminescence (CL) emission. Most polymers emit CL when they undergo oxidative degradation, and it originates from the bimolecular reaction of macroperoxy radicals which creates an excited carbonyl.

Light fastness of ink jet prints on modified conventional coatings

2004 ◽  
Vol 19 (4) ◽  
pp. 481-488 ◽  
Author(s):  
Katri Vikman ◽  
Tapani Vuorinen
Keyword(s):  
Light Fastness ◽  
Ink Jet
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