Product丨Application of UV absorber UV-531 in agricultural film products
Release time:
2023-04-07
Application of UV absorber UV-531 in agricultural film products
Agricultural film is an important and indispensable raw material in agricultural production. With the continuous development of modern agriculture, the demand for agricultural film has also put forward differentiated and better requirements. High-end functional agricultural film has been studied in depth because of its diverse functions, including dripping and mist elimination, high heat preservation, light conversion, light diffusion, long life, dust resistance and high light transmittance. At the same time, the mechanical properties retention rate of functional film is high when it is removed, and it has a certain use value after recycling, which is not only conducive to the establishment of an agricultural film recycling system, but also a means to improve the benefits of agricultural film enterprises.
UV absorber
As an important additive to support the weather resistance of functional agricultural films, UV absorbers can effectively improve the weather resistance of agricultural films, thereby increasing their service life. On the other hand, they can also reduce the impact of certain bands of ultraviolet rays on the growth of some crops. In high-altitude areas, such as the Northwest, Yunnan and Guizhou plateaus, the intensity of ultraviolet rays in the sun is greater than that in plain areas, and agricultural films age faster. Adding UV absorbers can increase the service life of agricultural films.
In addition, in crop planting, agricultural films with added UV absorbers can increase the fruit yield or appearance of crops that are sensitive to certain bands of ultraviolet rays. For example, tomatoes grown in greenhouses with UV-blocking agricultural films can prevent the peel from cracking and increase yields by more than 20%. This is because the agricultural films can promote fertility and extend the life of branches and trunks after blocking ultraviolet rays. Agricultural films that absorb and shield certain bands of ultraviolet rays can change the morphology of plants and improve their quality, such as increasing the sweetness of fruits and improving the morphology of planted flowers without curling leaves.
FENTASORB 531 UV Absorber
FENTASORB 531 UV absorber belongs to the benzophenone compound (UV531 for short, scientific name 2-hydroxy-4-n-octyloxybenzophenone), which absorbs particularly strongly at 270-330nm. The carbonyl and hydroxyl groups in its molecules can produce intramolecular hydrogen bonds to form a chelate ring. When the molecule is irradiated with ultraviolet rays, it absorbs energy, the molecular thermal vibration intensifies, the intramolecular hydrogen bonds are destroyed, the chelate ring opens, and the ultraviolet light energy is converted into heat energy for release, and then it returns to the initial molecular structure. Long-term use will not affect its performance, thereby preventing the polymer resin from absorbing ultraviolet energy and inducing photo-oxidation reactions.
Frequently Asked Questions
1. Is UV-531 necessary to be added to greenhouse film? What are the application scenarios?
No, UV absorbers are used in areas with high UV intensity such as high altitudes, or in crops that need to reduce UV rays in the 240-340nm band. They are usually used together with hindered amine light stabilizers.
2. When using greenhouse film, how to choose between UV-531 and UV-326?
UV-531 has a narrow absorption band and strong absorption, especially at 270-330nm. UV-326 has a wide absorption band and can effectively absorb ultraviolet rays in the 270-380nm band, mainly in the long-wave band. Specific applications need to be combined with the use scenarios of greenhouse films, crop varieties, and requirements for ultraviolet bands and intensity.
In addition, UV-531 is a benzophenone, while UV-326 is a benzotriazole. Currently, the European Persistent Organic Pollutants Review Committee has banned the use of benzotriazole UV-327 due to residual pollution, and has listed UV-326 as a key focus. When adding UV absorbers to export greenhouse film products, you should pay attention to choosing the right product.
3. What are the characteristics of FENTASORB 531?
Appearance and properties of FENTASORB 531: light yellow or white needle-shaped crystalline powder, high purity (purity>99.99%), melting point: 48-49℃, flash point: 155℃, transmittance: 94%Min at 450nm, 97%Min at 500nm. It is the most widely used UV absorber on the market.
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