Selection and application of anti-UV absorbers

” >UV absorber As a type of light stabilizer that is currently widely used, 240-460nm ultraviolet rays are very sensitive to colored objects. , has a strong reducing effect and can cause products to decompose and fade, so it is widely used in various plastics, coatings, rubber and other fields. However, there are now endless models of UV absorbers such as salicylates, benzophenones, and benzotriazoles on the market. And because of the particularity of UV absorbers, it is impossible to produce products without professional equipment testing. Problems will be discovered in time, so you need to be cautious when choosing UV absorbers.

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” >Now in the market, especially in the field of plastics, the use The more common models are UV-326, UV-329, UV-531 and other common models. Let’s takeUV531For example, this is a UV absorber with an absorption wavelength of 240-340nm. It is used in various plastics, coatings, and rubber. More, the melting point is 47-49°C. First of all, we can see that we often say that the ultraviolet wavelength is 240-460, but UV531 has a wide band that cannot be covered. Generally, we divide the ultraviolet band into three segments, namely UVA. , wavelength 400nm ~ 320nm, low frequency long wave, UVB wavelength 320nm ~ 280nm, medium frequency medium wave, UVC wavelength 280nm ~ 100nm, high frequency short wave. From the data, we can see that UV531 can only cover part of UVA and part of UVB. However, if you want to better protect the product from damage by ultraviolet absorbers and achieve a longer anti-aging effect, then it may not meet the requirements.

” >One ​​more thing is that we can seeThe melting point of 531 is 47-49 degrees Celsius. Low melting points make it easier to disperse during product production and processing, but Low melting point will also cause another problem. The temperature in summer is high. If you are not careful during transportation or storage, serious agglomeration will occur. Although the effect will not be compromised, it is not conducive to the next step of production and processing. , I believe many manufacturers using UV531 have encountered it.

” >For selection of UV absorbers, in fact, we generally recommend the best-matched composite UV absorbers. We know that strictly speaking, Ultraviolet absorbers are a type of light stabilizer. Light stabilizers enable polymers to eliminate or slow down photochemical reactions and prevent or delay the photoaging process under the radiation of light. To achieve the purpose of extending the service life of polymer products. Compared with UV absorbers, there are two ways to slow down the aging rate. In the industry, light stabilizers are often used in conjunction with UV absorbers, so that…It can achieve a good clamping effect, improve anti-aging performance, and reduce costs after adjusting the addition amount according to needs. And Ruiqit Optimizing the formula can achieve a larger absorption wavelength, which can greatly reduce costs while achieving comparable performance.