UV-531

Catalog NumberHG1843056

CAS Number1843-05-6

CategoryUV Absorbers

Molecular Weight

326.43

Molecular Formula

C21H26O3

Melting Point

47-50 °C

Density

1.16 g/ml

Appearance

Light yellow powder

Application

LLDPE, EVA, HDPE, PVC, elastomer

Storage

Keep container tightly closed and dry and storage in cool place

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Case Study

UV-531/Pigment Violet Composite Stabilizer for Anti-UV Aging of Asphalt

Zhang, Fa, et al. Processes 12.12 (2024): 2758.

UV-531 (2-hydroxy-4-n-octyoxybenzophenone) is a widely used benzophenone UV absorber that was combined with pigment violet (PV) to produce a composite light stabilizer improving the UV-aging resistance of asphalt pavements.
Experimental Protocol: SK-70A matrix asphalt (240 g) was heated at 130 °C for 30 min and stirred at 1000 rpm for 5 min; 1.44 g UV-531 (0.6% relative to asphalt) was then added with stirring at 1500 rpm for 10 min and 275 rpm for 5 min. PV-modified asphalt used 0.3% PV, and the composite asphalt received 0.6% UV-531 followed by 0.3% PV. Films of 15 ± 0.1 g (about 1 mm thick) were UV-aged at 340 nm, 300 W/m², for 0, 48, 84, 108 and 144 h. Characterization used conventional performance tests, FTIR, GPC and DSR.
Performance Evaluation: UV-531 absorbed 240-340 nm, whereas the UV-531/PV composite extended absorption to 200-383 nm. After 144 h, the composite-modified asphalt softening point rose only from 50.5 to 50.8 °C, with ductility down 8.0% and penetration down 4.3%; its I_C=O and I_S=O changed slightly (0.0118 to 0.0154 and 0.0333 to 0.0414) versus matrix asphalt (0.0076 to 0.1028 and 0.0379 to 0.0804), and G' increased only 19.2% versus 45.1%.

UV-531 in a ZnO/PHMB Composite for Preventive Protection of Paper Relics

Zhang, Dahai, et al. Langmuir 37.28 (2021): 8445-8454.

UV-531 (2-hydroxy-4-(octyloxy)benzophenone) was integrated with alkaline zinc oxide nanoparticles and the antibacterial agent polyhexamethylene biguanidine hydrochloride (PHMB) to protect paper-based cultural relics against UV light, acidity and mold.
Experimental Protocol: Nano-ZnO was prepared from zinc nitrate, PVA and isopropanolamine; UV-531 (1.5 g in 99.5 g isopropanol, 0.036 mol/L) was mixed with PHMB solutions of 0.25-3.0 wt% in water/ethanol (1:3) at a 2:3 volume ratio. Handmade paper (HMP, 1988), old newspaper (ONP, 1988) and an ink-wash painting were coated. Dry-heat aging was at 105 ± 2 °C for 72 h, and UV aging used a 30 W source (295-400 nm), with HMP/ONP exposed for 4 days and the paintings for 14 days. Characterization included FTIR, UV-vis, SEM/TEM, tensile strength, folding endurance, pH and CIE colorimetry; mold inhibition used Mucor, Aspergillus niger and Trichoderma.
Performance Evaluation: UV-531 absorbs 240-340 nm (especially 270-330 nm), and 1% PHMB was selected as the optimal dose. The composite's inhibition zone against A. niger reached 490.07 mm², more than three times PHMB (142 mm²) and ZnO (138.97 mm²). Coated HMP had a ΔE* of 3.29 versus 8.15 for untreated paper after UV aging, and coated paintings showed far less fading (ΔE* 9.37, 8.80 and 4.39 versus 41.73, 37.87 and 19.26).

UV-531 as a Photoprotectant for Abscisic Acid under UV Radiation

Gao, Fei, et al. Journal of Photochemistry and Photobiology B: Biology 158 (2016): 99-104.

UV-531 (2-hydroxy-4-n-octoxy-benzophenone) is an oil-soluble benzophenone absorber, tested here as a photoprotectant to reduce UV-induced photodegradation of the phytohormone abscisic acid (ABA).
Experimental Protocol: Methanol solutions of 5 mg/L ABA were prepared with UV-531, BP-4 and the photostabilizer HS-770 in molar combinations (ABA:UV absorber:photostabilizer = 1:1:0, 1:0:1, 1:0:0 and 1:1:1), stored in amber bottles at 4 °C and irradiated in quartz tubes around a 300 W mercury lamp with a 365 nm filter for 8 min. Aqueous ABA (280 mg/L) with BP-4 at 0, 50, 100 and 200 mg/L was irradiated for up to 8 h. ABA and trans-ABA were quantified by HPLC on a C18 column (methanol/water 60:40 with 0.2% acetic acid, 1 mL/min, 260 nm). Wheat seed germination bioassays used 300-fold diluents.
Performance Evaluation: UV-531 and BP-4 both significantly reduced ABA degradation and showed no significant difference from each other, lowering the trans-ABA/ABA slope to 0.029 from 0.036 for ABA alone (about 20% lower). At UVB wavelengths, UV-531 or BP-4 absorbed 0.6 to 51.2 times more UV radiation than ABA. In contrast, HS-770 accelerated ABA degradation rather than stabilizing the hormone.

• Molecular Weight: 326.43
• Molecular Formula: C21H26O3
• Melting Point: 47-50 °C
• Density: 1.16 g/ml
• Appearance: Light yellow powder
• Application: LLDPE, EVA, HDPE, PVC, elastomer
• Storage: Keep container tightly closed and dry and storage in cool place