Following on from jiuyu share classification by mechanism of action of light stabilizer, as follows:

(1) light shield agent: this is a class of substances covered or reflected ultraviolet, prevented light from penetrating inside the polymer, and thus play a role in protecting polymers. Light shield agent carbon black, titanium dioxide, inorganic pigments and phthalocyanine blue, phthalocyanine green, organic pigments, carbon black shield is the best of them.

(2) the UV-absorber: it can effectively absorb the ultraviolet wavelength of 290~410nm, but rarely absorb visible light, which itself has a good thermal and light stability. According to its chemical structure can be divided into: o-diphenyl methyl ketone, benzo-triazole, salicylic acid esters, triazine, replacing acrylonitrile class. As a light and hindered such light stabilizer for common use, especially used in polyolefin or paint.

(3) the quenching agents: you can accept the energy absorbed by the chromophore in the plastic, and that energy in the form of heat, fluorescent or phosphorescent spread so as to protect the polymer from damage by UV light. It's good for the stability of polymer effect, and more for films and fibers. Mainly some Divalent organic nickel-chelate. Organic nickel light stabilizers with a good performance, but due to the toxicity of heavy metals problems, was replaced by other nontoxic or low-toxic Quencher.

(4) free radical scavenger: capture these light stabilizers in polymer produced by reactive free radicals, thereby inhibiting oxidation processes achieve the goal light. Mainly hindered amine light stabilizers (HALS). Is the most promising a new type of high efficiency light stabilizers, annual average demand growth rate of 20%~30% at the international level.

(5) hydrogen peroxide decomposers: is a kind of hindered amine light stabilizers. Polymer during storage and processing to produce hydrogen peroxide, resulting in the photo-oxidation degradation of polymer, agent that breaks down hydrogen peroxide decomposition peroxide, producing a stable nitrogen-oxygen free radicals, and further capture free radicals, thereby inhibiting polymer degradation.

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This article is from: UV absorber, UV-531, antioxidant, jiuyu http://www.zjgjyhg.com/