Chemistry:UV-328

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UV-328
UV-328.svg
Names
Preferred IUPAC name
2-(2H-1,2,3-Benzotriazol-2-yl)-4,6-bis(2-methylbutan-2-yl)phenol
Other names
2-(2H-Benzotriazol-2-yl)-4,6-di-tert-pentylphenol; Tinuvin-328; UV-328
Identifiers
3D model (JSmol)
ChemSpider
EC Number
  • 247-384-8
UNII
Properties
C22H29N3O
Molar mass 351.494 g·mol−1
Appearance Solid
Melting point 80-86 °C[1]
0,17±0,07 μg·l−1 (25 °C)[2]
Hazards
GHS pictograms GHS07: Harmful
GHS Signal word Warning
H373, H413
P260, P273, P314, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

UV-328 (2-(2H-benzotriazol-2-yl)-4,6-di-tert-pentylphenol) is a chemical compound that belongs to the phenolic benzotriazoles. It is a UV filter that is used as an antioxidant for plastics.[3]

Properties

UV-328 has a melting point of 80-86 °C, a vapor pressure of 4,6·10−5 Pa (20 °C) and a water solubility of 0,17±0,07 μg·l−1 (25 °C).[2]

The octanol-water partition coefficient (log KOW) is 7,93.[2][4]

Applications

UV-328 is a light stabilizer for a variety of plastics and other organic substrates. Its use is recommended for the stabilization of styrene homopolymers and copolymers, acrylic polymers, unsaturated polyesters, polyvinyl chloride, polyolefins, polyurethanes, polyacetals, polyvinyl butyral, elastomers and adhesives.[5] It protects polymers and organic pigments from UV radiation and helps maintain the original appearance and physical integrity of moldings, films, sheets and fibers during outdoor weathering. The application concentration is 0.1-1 %.[5]

UV-328 is recommended for applications such as automotive coatings, industrial coatings, commercial inks such as wood stains or do-it-yourself inks.[6]

Hazard

UV-328 is persistent, bioaccumulative and toxic (PBT) as well as very persistent and very bioaccumulative (vPvB). Thus, it is in the list of substances of very high concern.[7] The 2023 Conference of the Parties of the United Nations Stockholm Convention on Persistent Organic Pollutants took the decision to eliminate the use of UV-328, by listing this chemical in Annex A to the Convention.[8]

A bioaccumulation factor (log BAF) of 2,6–3,4 was determined in fish from Canadian rivers.[9] It may cause long lasting harmful effects to aquatic life.[10]

UV-328 has been found to be associated with adverse health effects in mammals based on repeated-dose toxicity studies conducted in rats and dogs, with the primary health effect being liver toxicity. It is also associated with adverse effects on the kidney based on the study in rats.[11]

The finding of UV-328 in plastics sampled on remote beaches,[12] in stomachs of seabirds[13] and in preen gland oil[14][15] show that it is also transported over long distances and is taken up by biota.[16] Detections in Arctic biota include eggs of common eider, kittiwake, European shag and glaucous gull as well as the livers of mink.[17]

References

  1. ↑ Wypych, Anna (2015-07-08) (in en). Databook of UV Stabilizers. Elsevier. ISBN 9781927885031. https://books.google.com/books?id=RMbuBQAAQBAJ&pg=PA72. 
  2. ↑ 2.0 2.1 2.2 Anh T. Ngoc Do; Yeonjeong Ha; Hyun-Joong Kang; Ju Min Kim; Jung-Hwan Kwon (April 2022), "Equilibrium leaching of selected ultraviolet stabilizers from plastic products", Journal of Hazardous Materials 427: 128144, doi:10.1016/j.jhazmat.2021.128144, PMID 34979390 
  3. ↑ "2-(2H-Benzotriazol-2-yl)-4,6-di-tert-pentylphenol". https://www.trc-canada.com/product-detail/?B207045. 
  4. ↑ Anh T. Ngoc Do; Yeonjeong Ha; Hyun-Joong Kang; Ju Min Kim; Jung-Hwan Kwon (May 2022), "Corrigendum to "Equilibrium leaching of selected ultraviolet stabilizers from plastic products" [J. Hazard. Mater. 427 (2022) 128144]", Journal of Hazardous Materials 430: Table S1, doi:10.1016/j.jhazmat.2022.128487, PMID 35183055 
  5. ↑ 5.0 5.1 "Ciba® TINUVIN® 328 Benzotriazole UV Absorber". https://www.pharosproject.net/uploads/files/sources/1828/1371648647.pdf. 
  6. ↑ "Ciba® TINUVIN® 328 Light Stabiliser". Ciba Speciality Chemicals. http://techno-eg.com/prod/chem/general/tinuvin%20328.pdf. 
  7. ↑ "Candidate List of substances of very high concern for Authorisation - ECHA" (in en-GB). https://echa.europa.eu/candidate-list-table/-/dislist/details/0b0236e18059080a. 
  8. ↑ "Governments accelerate action and take bold decisions to address pollution from chemicals and wastes". Secretariat of the Basel, Rotterdam and Stockholm Conventions. May 15, 2023. https://www.brsmeas.org/MediaHub/News/PressReleases/OutcomesCOPs2023/tabid/9569/language/en-US/Default.aspx. 
  9. ↑ Abigaëlle Dalpé Castilloux, Magali Houde, Andrée Gendron, Amila De Silva, Youssouf Djibril Soubaneh, Zhe Lu (2022-04-19), "Distribution and Fate of Ultraviolet Absorbents and Industrial Antioxidants in the St. Lawrence River, Quebec, Canada", Environmental Science & Technology 56 (8): 5009–5019, doi:10.1021/acs.est.1c07932, PMID 35395156, Bibcode: 2022EnST...56.5009C 
  10. ↑ "Classifications - CL Inventory". https://echa.europa.eu/information-on-chemicals/cl-inventory-database/-/discli/details/97031. 
  11. ↑ "Opinion on the specific target organ toxicity of 2-benzotriazol-2-yl-4,6-di-tert-butylphenol (UV-320) and 2-(2H-benzotriazol-2-yl)-4,6-ditertpentylphenol (UV-328)". https://echa.europa.eu/documents/10162/17233/rac_opinion_uv-320-328_en.pdf/34ab1637-2db8-456c-b19c-918db4c99395. 
  12. ↑ Tanaka, Kosuke; Takada, Hideshige; Ikenaka, Yoshinori; Nakayama, Shouta M. M.; Ishizuka, Mayumi (2020-01-01). "Occurrence and concentrations of chemical additives in plastic fragments on a beach on the island of Kauai, Hawaii" (in en). Marine Pollution Bulletin 150: 110732. doi:10.1016/j.marpolbul.2019.110732. ISSN 0025-326X. PMID 31757391. Bibcode: 2020MarPB.15010732T. http://www.sciencedirect.com/science/article/pii/S0025326X19308884. 
  13. ↑ Tanaka, Kosuke; van Franeker, Jan A.; Deguchi, Tomohiro; Takada, Hideshige (August 2019). "Piece-by-piece analysis of additives and manufacturing byproducts in plastics ingested by seabirds: Implication for risk of exposure to seabirds". Marine Pollution Bulletin 145: 36–41. doi:10.1016/j.marpolbul.2019.05.028. ISSN 1879-3363. PMID 31590798. Bibcode: 2019MarPB.145...36T. https://pubmed.ncbi.nlm.nih.gov/31590798/. 
  14. ↑ Tanaka, Kosuke; Watanuki, Yutaka; Takada, Hideshige; Ishizuka, Mayumi; Yamashita, Rei; Kazama, Mami; Hiki, Nagako; Kashiwada, Fumika et al. (February 2020). "In Vivo Accumulation of Plastic-Derived Chemicals into Seabird Tissues". Current Biology 30 (4): 723–728.e3. doi:10.1016/j.cub.2019.12.037. ISSN 0960-9822. PMID 32008901. 
  15. ↑ Yamashita, Rei; Hiki, Nagako; Kashiwada, Fumika; Takada, Hideshige; Mizukawa, Kaoruko; Hardesty, Britta Denise; Roman, Lauren; Hyrenbach, David et al. (2021). "Plastic additives and legacy persistent organic pollutants in the preen gland oil of seabirds sampled across the globe". Environmental Monitoring and Contaminants Research 1: 97–112. doi:10.5985/emcr.20210009. https://www.jstage.jst.go.jp/article/emcr/1/0/1_20210009/_article. 
  16. ↑ Andrade, Helena; Glüge, Juliane; Herzke, Dorte; Ashta, Narain Maharaj; Nayagar, Shwetha Manohar; Scheringer, Martin (2021-07-22). "Oceanic long-range transport of organic additives present in plastic products: an overview". Environmental Sciences Europe 33 (1): 85. doi:10.1186/s12302-021-00522-x. ISSN 2190-4715. 
  17. ↑ Schlabach (2019). "Screening program 2018: Volatiles, Gd, BADGE, UV filters, Additives, and Medicines". NILU, NIVA. https://www.miljodirektoratet.no/globalassets/publikasjoner/m1490/m1490.pdf. 



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