Speaking of UV absorbers, light stabilizers, these professional chemical terms may not be clear to many people what this is, but if you say that sunscreen added with UV absorbers, it can protect our skin from the hot sun tanning, sunburn, many people may suddenly understand, understand what UV absorbers are products, what role it plays.
Hindered amine light stabilizers
In fact, ultraviolet absorbers and light stabilizers (also known as hindered amine light stabilizers) in our daily use of organic material products added in large quantities, just you do not know it. We drive the family car outside the paint, paint will generally add, it can protect the car’s color does not yellow, not fade, not lose light, the role of a great.
- We often look at the computer, cell phone screen, its inside layer of optical film will also add some special properties of UV absorbers, which can block harmful UV rays to protect our eyes from harm… …
- Since the UV absorbers and light stabilizers are so widely used, the role is so great, then what is the difference between them?
Protection of polymer
Light stabilizers and UV absorbers in the protection of polymer materials weathering aging functions are different, UV absorbers belong to the physical protection, light stabilizers belong to the free radical trapping agent, the role of the process of cyclic regeneration.
The efficacy of light stabilizers and UV absorbers is related to the molecular structure, polarity, thickness, density, acidity and alkalinity of the organic products being protected, and other factors such as color fillers. There are many kinds of light stabilizers and ultraviolet absorbers, and different products need to be used according to the different materials being protected.
UV absorbers and light stabilizers
So, UV absorbers and light stabilizers are both important chemical additives to protect and maintain the performance of organic materials, but there are some functional differences between the two. UV absorbers can be harmful UV through the conversion of its special chemical structure, the harmful UV damage energy into harmless heat energy released to avoid the high energy of UV to organic materials to break the composition of the molecular chain.
UV absorber protection: Thus losing the performance of polymer materials should be; and light stabilizers can be understood as a trapping agent for harmful radicals, once some UV breaks through the UV absorber protection and Once some UV light breaks through the UV absorber protection and breaks the organic material molecular chain, the formation of harmful polymer radicals, light stabilizers will be able to timely capture the harmful radicals into a harmless and stable small molecule structure.
Usually people will be added to the UV absorber and light stabilizer in a certain proportion of the combination of organic materials, its protective properties are often better than the effect of UV absorbers or light stabilizers alone. UV absorbers and light stabilizers are the collective name for two types of products, under which there are many different types, constituting a large industrial system.
- UV absorbers on the market are common mainstream types of benzophenones, benzotriazoles, triazines, etc., which are different in the performance of UV shielding and application industries;
- Taiwan Yongguang Chemical production of UV absorbers type on the benzotriazoles and triazines are mainly used in coatings, optical films and other industries;
- light stabilizers are also a general term, the industry is often based on its different degrees of alkalinity, and the production.
- The industry often produces many qualities according to their different degrees of alkalinity,.
- And the appearance of the different differences in powder and liquid.
- The main light stabilizers produced by Taiwan Everlight Chemical are all liquid, which are more suitable for use in coatings.
Application of light stabilizers in plastics
The degradation of PVC resin by thermal processing, thermal oxidation and photo-oxidation is accompanied by the reaction of de-hydrogen chloride (HC1). Hydrogen chloride can interact with nitrogen-containing alkaline hindered amines to inhibit the generation of reactive nitrogen oxygen radicals NO-, so that hindered amines “poisoning”, and thus lose the role or function of stability.
With the development of PVC polymerization process technology and PVC stabilizer performance improvement, PVC resin due to decomposition of hydrogen chloride is no longer enough to inhibit the role of hindered amine, hindered amine light stabilizer in the PVC application of more and more examples. And satisfactory results have been achieved.
Application of external ray absorbers in plastics
UV-absorbing light stabilizers are commonly known as UV absorbers, these light stabilizers are the use of their own molecular structure, the conversion of light energy into heat, to avoid photo-oxidation of plastic materials and play a role in light stabilization. UV absorbers are divided into benzophenone and benzo** class according to the different molecular structures. Domestic benzophenone light stabilizers and benz** class light stabilizers consumption accounted for 25% and 10% of the total consumption of domestic light stabilizers, respectively.
|Sinocure® TPO||75980-60-8||Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide|
|Sinocure® TPO-L||84434-11-7||Ethyl (2,4,6-trimethylbenzoyl) phenylphosphinate|
|Sinocure® 819/920||162881-26-7||Phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide|
|Sinocure® 184||947-19-3||1-Hydroxycyclohexyl phenyl ketone|
|Sinocure®150||163702-01-0||Benzene, (1-methylethenyl)-, homopolymer,ar-(2-hydroxy-2-methyl-1-oxopropyl) derivs|
|Sinocure®160||71868-15-0||Difunctional alpha hydroxy ketone|
|Sinocure®754||211510-16-6||Benzeneacetic acid, alpha-oxo-, Oxydi-2,1-ethanediyl ester|
|Sinocure®250||344562-80-7||(4-Methylphenyl) [4-(2-methylpropyl)phenyl] iodoniumhexafluorophosphate|
|Sinocure® 369||119313-12-1||Omnirad 369|
|Sinocure® 379||119344-86-4||1-Butanone, 2-(dimethylamino)-2-(4-methylphenyl)methyl-1-4-(4-morpholinyl)phenyl-|