Speaking of uv absorbers, light stabilizers these professional chemical terms may not be clear to many people what this is, but if the sunscreen will add ultraviolet absorbers, ultraviolet absorbers can protect our skin from the sun tanning, sunburn, so many people may suddenly realize that ultraviolet absorbers are what products, what role. In fact, UV absorbers and light stabilizers are added to the organic material products we use every day, but you just don’t know it. We drive the family car outside the paint, paint will generally be added, it can protect the color of the car unchanged yellow, do not fade, do not lose light, the role is very great; We often see the computer, mobile phone screen, the layers of optical film inside will also add some special performance of ultraviolet absorbers, it can block harmful ultraviolet rays to protect our eyes to avoid damage, let’s understand the difference between the two.

The definition of light stabilizer and uv absorbers

Light stabilizers and uv absorbers are chemicals used to resist the damage of external factors such as sunlight and ultraviolet rays to the material and protect the original properties of the material.

Light stabilizers protect molecules or materials by activating free radicals in molecules, making them inactive. It can prevent the formation of molecular free radicals and the conduct of chain reactions in a variety of ways, such as diffusion absorption, dispersion absorption, photocharge transfer, etc., so as to achieve the purpose of protecting materials.

Uv absorbers are molecules with some special energy level structures, which can absorb ultraviolet energy and make electronic transitions under ultraviolet irradiation, thereby reducing the photodecomposition reaction in the material and playing a protective role.

Mechanism of action of light stabilizer and uv absorber

Light stabilizers protect the material by neutralizing free radicals in the molecules. Because the free radicals in the material can activate and destroy the chemical bonds in the compound, causing the material to lose color, turn yellow, become brittle, etc. Light stabilizers can maintain the original properties of the material by absorbing free radicals, neutralizing their activity, and then binding with the material molecules to prevent reactions between molecules.

Uv absorbers is to absorb ultraviolet light, so that the energy of ultraviolet light is not enough to activate the chemical bonds in the material, so as to protect the material from light damage. Ultraviolet absorbers absorb ultraviolet light in different ways, there are two types of absorption of shorter wavelength light and absorption of longer wavelength light.

Scope of use of light stabilizers and UV absorbers

Light stabilizers and UV absorbers are used differently in materials. Light stabilizer is mainly used in various plastics, such as PE, PP, PVC and other materials, as well as a variety of synthetic rubber, optical fiber, plexiglass and other materials.

Uv absorbers are widely used in sunscreen skin care, plastics, coatings, printing inks and other materials, such as ABS, polycarbonate, polyphenyl ethers, polyamide fiber, polyester and other materials.

Characteristics of light stabilizers and uv absorbers

The thermal stability of the light stabilizer is usually better, and it can resist the influence of high temperature and oxidant. However, its protective effect is not ideal enough to completely hinder the fracture of the material molecular chain and the oxidation reaction.

The uv absorbers has the advantages of good dispersion, poor thermal conductivity, and does not interfere with the physical properties of the material, and its protection ability for the material properties is strong.

We are a professional manufacturer of photoinitiators and UV absorbers, with more than ten years of chemical production experience. In short, light stabilizers and uv absorbers have advantages and disadvantages, and different materials need to be selected according to the actual situation. At the same time, in the processing and molding of materials involving the use of light stabilizers and uv absorbers, it is also necessary to follow up the requirements of relevant regulations for safe use.