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.

Synthesis and Application of New Benzotriazole Derivatives as UV Absorbers for Polyester Fabrics

2011 ◽  
Vol 233-235 ◽  
pp. 219-224 ◽  
Author(s):  
Yan Yan Yang ◽  
Hong Qi Li ◽  
Xue Dan He ◽  
Bing Nan Mu ◽  
Yi Jun Chen ◽  
...  
Keyword(s):  
Uv Light ◽  
Protection Factor ◽  
Polyester Fabrics ◽  
Ultraviolet Protection Factor ◽  
Uv Absorbers ◽  
Ultraviolet Protection ◽  
Dyeing Method ◽  
Uv Transmittance ◽  
The Relationship ◽  
Benzotriazole Derivatives

2-(2′-Hydroxyphenyl)-5-amino-2H-benzotriazole was synthesized and subjected to acylamidation to yield three new ultraviolet (UV) absorbers. The largest absorption wavelength and the relationship between the concentration and the maximum absorbance of the UV absorbers were measured in dimethylsulfoxide. Then the four benzotriazole type UV absorbers were dispersed and applied onto polyester fabrics with the high temperature and pressure dyeing method. The stabilizing effect against UV light of the finished fabrics was studied by ultraviolet protection factor (UPF) and UV transmittance measurement.

scholarly journals Synthesis and Physicochemical Properties of [(1R,2S,5R)-2-isopropyl-5-methylcyclohexyloxy]-thiophen-5-yl-substituted Tetrapyrazinoporphyrazine with Magnesium(II) Ion

2021 ◽  
Vol 11 (6) ◽  
pp. 2576
Author(s):  
Sebastian Lijewski ◽  
Jiří Tydlitát ◽  
Beata Czarczynska-Goslinska ◽  
Milan Klikar ◽  
Jadwiga Mielcarek ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Singlet Oxygen ◽  
2D Nmr ◽  
Nmr Studies ◽  
Oxygen Formation ◽  
Nmr Techniques ◽  
Flash Column Chromatography ◽  
Photochemical Stability ◽  
Singlet Oxygen Formation ◽  
Very High

Tetrapyrazinoporphyrazine with peripheral menthol-thiophenyl substituents was synthesized using Linstead conditions and purified by flash column chromatography. The optimized synthetic and purification procedures allowed us to obtain a new macrocycle with 36% yield. Tetrapyrazinoporphyrazine derivative was characterized by UV–Vis and NMR spectroscopy, as well as MS spectrometry. Complex NMR studies using 1D and 2D NMR techniques allowed the analysis of the bulky menthol-thiophenyl substituted periphery of the new macrocycle. Further, photochemical stability and singlet oxygen quantum yield were determined by indirect method with diphenylisobenzofuran. The new tetrapyrazinoporphyrazine revealed low generation of singlet oxygen with a quantum yield of singlet oxygen formation at 2.3% in dimethylformamide. In turn, the macrocycle under irradiation with visible light presented very high stability with quantum yield for photostability of 9.59 × 10−6 in dimethylformamide, which figures significantly exceed the border for its classification as a stable porphyrinoid (10−4–10−5).

Facile fabrication of polyvinyl alcohol-based hydrophobic, fluorescent film via Hantzsch reaction for broadband UV protection

2021 ◽  
Author(s):  
Hongchen Liu ◽  
Hongying Yang ◽  
Kunkun Zhu ◽  
Fang Peng ◽  
Lei Guo ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Chemical Modification ◽  
Human Health ◽  
Uv Light ◽  
Uv Protection ◽  
Hantzsch Reaction ◽  
Uv Absorbers ◽  
Traditional Preparation ◽  
Facile Fabrication

Excessive exposure to ultraviolet (UV) light is harmful to human health. However, the traditional preparation of anti-UV films through doping UV absorbers is unstable. Chemical modification of polyvinyl alcohol (PVA)...

scholarly journals Treatment of polyamide 66 fabric for increased ultraviolet protection

2019 ◽  
Vol 90 (15-16) ◽  
pp. 1881-1888
Author(s):  
Barbara Rietzler ◽  
Barnaby Caven ◽  
Thomas Bechtold ◽  
Tung Pham
Keyword(s):  
Surface Roughness ◽  
Solvent Mixture ◽  
Environmentally Benign ◽  
Polyamide 66 ◽  
Protection Factor ◽  
Short Treatment ◽  
Substrate Topography ◽  
A Value ◽  
Uv Absorbers ◽  
Ultraviolet Protection

We reported previously that treatment of polyamide 66 with a mixture of CaCl2/EtOH/water results in a significant increase of surface roughness. A higher surface roughness is correlated with greater light scattering propensity, and therefore we investigated if polyamide 66 fabrics treated with the mixture exhibit lower ultraviolet (UV) transmission. The work was performed on a commercially available plain-woven polyamide 66 fabric, and the UV protection factor (UPF) increased from a value of 25 (of the fabric as received) to >100 (after a 1-min treatment with the mixture). There was no significant change in cover factor of the fabric. As the solvent mixture is environmentally benign and the desired effects are obtained with short treatment times, we believe this process may be a more sustainable alternative to the use of UV absorbers that is the state-of-the-art technology at the present time. In this paper, we have described the treatment and its effects on substrate topography and mechanical properties.

Triplet formation of 6-azauridine and singlet oxygen sensitization with UV light irradiation

2010 ◽  
Vol 12 (19) ◽  
pp. 5140 ◽  
Author(s):  
Takashi Kobayashi ◽  
Hikaru Kuramochi ◽  
Tadashi Suzuki ◽  
Teijiro Ichimura
Keyword(s):  
Singlet Oxygen ◽  
Uv Light ◽  
Light Irradiation ◽  
Uv Light Irradiation ◽  
Triplet Formation

Visible light-driven photogeneration of hydrogen sulfide

2017 ◽  
Vol 53 (86) ◽  
pp. 11830-11833 ◽  
Author(s):  
Seung Yeon Yi ◽  
Yu Kyung Moon ◽  
Sinheui Kim ◽  
Sonam Kim ◽  
Gyurim Park ◽  
...  
Keyword(s):  
Hydrogen Sulfide ◽  
Visible Light ◽  
Singlet Oxygen ◽  
Efficient Generation ◽  
Combined Use ◽  
Visible Light Driven

The combined use of a singlet oxygen photosensitizer and 1,3-diarylisobenzothiophene enables efficient generation of hydrogen sulfide at tunable photoirradiation wavelengths.

A Practical, Enantiospecific Synthesis of (S)-Trans-γ-Monocyclofarnesol

2012 ◽  
Vol 7 (12) ◽  
pp. 1934578X1200701 ◽  
Author(s):  
Stefano Serra
Keyword(s):  
Fractional Crystallization ◽  
Good Yield ◽  
Target Compound ◽  
Combined Use ◽  
Enantiospecific Synthesis ◽  
Key Steps ◽  
Very High

An expedient and concise synthesis of (S)-trans-γ-monocyclofarnesol is here described. The aforementioned sesquiterpene was prepared starting from enantioenriched (S)-γ-dihydroionone, which was in turn obtained from racemic α-ionone through the combined use of two previously developed processes. Key steps of the presented synthesis are the stereoselective Horner-Wadsworth-Emmons reaction between triethyl phosphonoacetate and γ-dihydroionone and the effective fractional crystallization of the γ-monocyclofarnesol-3,5-dinitrobenzoate esters. By these means the target compound was obtained in good yield and with very high stereoisomeric purity.

Chemical pretreatment of combined sewer overflows for improved UV disinfection

2015 ◽  
Vol 73 (2) ◽  
pp. 375-381 ◽  
Author(s):  
J. Gibson ◽  
R. Farnood ◽  
P. Seto
Keyword(s):  
Light Transmission ◽  
Uv Light ◽  
Uv Disinfection ◽  
Cationic Polymers ◽  
Combined Sewer Overflows ◽  
Combined Sewer ◽  
Sewer Overflows ◽  
Pre Treatment ◽  
Low Charge ◽  
Very High

The aim of this research was to better understand chemical pre-treatment of combined sewer overflows (CSOs) for subsequent ultraviolet (UV) disinfection. Approximately 200 jar tests were completed. Alum (Al2(S04)3·12H2O) resulted in a higher UV light transmission (UVT), and equivalent total suspended solids (TSS) removal, than ferric chloride (FeCl3). An alum dose of 20 mg/L increased the UVT of the raw CSO from 30 to 60% after settling. The addition of 100 mg/L of alum maximized UVT reaching approximately 85%. Flocculation did not increase UVT. However, it did improve the removal of TSS. Cationic polymers worked quickly compared with metal coagulants, but only reached a UVT of 60%. A high positive charge density on the polymer improved the removal of turbidity when compared with low charge, but did not affect UVT. If the goal is to maximise UVT, a very high alum dose may be preferred. If the goal is to minimize coagulant dose with moderate UV performance, cationic polymer at approximately 3 mg/L is recommended.

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