光稳定剂928
UV Absorber 928
CAS: 73936-91-1
Molecular Formula: C29H35N3O
光稳定剂928 - Names and Identifiers
光稳定剂928 - Physico-chemical Properties
| Molecular Formula | C29H35N3O |
| Molar Mass | 441.61 |
| Density | 1.07 |
| Melting Point | 112 °C |
| Boling Point | 555.5±60.0 °C(Predicted) |
| Solubility | soluble in Toluene |
| Appearance | powder to crystal |
| Color | White to Orange to Green |
| pKa | 8.05±0.50(Predicted) |
| Storage Condition | 2-8℃ |
| Physical and Chemical Properties | With appearance of white to light yellow granular crystalline powder, light transmittance of 440nm ≥ 97.0% 500nm ≥ 98.0% volatile ≤ 0.3% ash ≤ 0.1% melting point 108-110 ℃, content ≥ 99% toxicity, low toxicity, rat oral LD 50 >2g/Kg body weight |
光稳定剂928 - Reference Information
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Features & uses | has a wide range of absorption characteristics, can effectively protect the coating and other photosensitive materials; High solubility, high temperature and environmental durability and other characteristics; Suitable for high performance coatings, especially for powder coatings and coil continuous coatings, can also be used for automotive coatings and conventional coatings. General and light stabilizer UV-292 or UV-123 used together better |
| storage | avoid Yang, high light, moisture, and avoid sulfur-containing or halogen-containing light stabilizers. Storage in sealed, dry, and protected from light is required. |
| UV absorber | plastic and other polymer materials in sunlight or fluorescence, due to the action of ultraviolet, produce automatic oxidation reaction, this results in degradation of the polymer and deterioration of the appearance and mechanical properties. Where the absorption of sunlight and fluorescent light source in the ultraviolet part, and itself does not change the material called ultraviolet absorber, is a kind of light stabilizer. Ultraviolet wavelengths below 290nm, before reaching the ground, are fully absorbed by the ozone layer, the problem is 290 ~ 400nm of ultraviolet light, the light energy and polymer aging. The function of the ultraviolet absorber is to selectively absorb such high-energy ultraviolet rays, which are converted into harmless energy and released or consumed by energy conversion. Depending on the type of the polymer, the wavelength of the ultraviolet rays that cause deterioration is also different. The wavelengths that can be maximally affected are: polyethylene 300nm, polyvinyl chloride 310nm, polystyrene 318nm, polyester 325nm, polypropylene 310nm, vinyl chloride-vinyl acetate copolymer 322 ~ 364nm, polyoxymethylene 300 ~ 320nm, polycarbonate 295nm, nitrocellulose 310nm, polymethyl methacrylate 290 ~ 315nm, thermoplastic resin 290 ~ 320nm, unsaturated polyester 325nm. The ultraviolet absorber can convert high-energy ultraviolet light energy into thermal energy or release a longer light wave without destruction, thereby protecting the substance to which the ultraviolet absorber is added from damage by ultraviolet rays. It is mainly used as a light stabilizer for plastics, rubber, coatings, dyes, etc., to prevent their photodecomposition during long-term exposure to sunlight. General requirements of light color, good miscibility, heat resistance and chemical stability, low volatility. For food packaging materials, but also need non-toxic and non-migration. The sensitive wavelength of various substances to ultraviolet rays is different, and the range of light waves that can be absorbed by various ultraviolet absorbers is also different, and the appropriate choice can achieve satisfactory light stabilization effect. UV absorbers can be divided into the following categories according to the chemical structure: Salicylic acid esters, benzophenones, benzotriazoles, substituted acrylonitrile, triazine and other categories, commonly used UV absorbers: UV absorber uV-9, ultraviolet absorber uV-531, ultraviolet absorber N-35, ultraviolet absorber -928, and ultraviolet absorber TBS. |
Last Update：2024-04-09 20:49:11
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