The benefits of pigment carbon black on plastics

    Plastic is not unfamiliar to everyone, and its application range is very wide, which can be seen everywhere. As we all know, if plastic is exposed to sunlight for a long time, it can cause great damage to the plastic. So how to effectively prevent it is related to the existence of pigment carbon black.
    The protective effect of carbon black on the ultraviolet aging of plastics depends on its particle size, structure, and surface chemistry.
When the particle size of carbon black is small, its ability to absorb or block light increases due to an increase in surface area, resulting in an enhanced UV protection effect. However, when the particle size is less than 20nm, its protective effect tends to the same level. The reason is that when the particle size is too small, reverse scattering decreases, and further forward light can threaten the stability of the polymer. Lower structure, i.e. smaller aggregate size, enhances the protective effect of polymers due to their smaller geometric volume, which is also the reason why carbon black with lower structure is blacker. When there are many oxygen-containing groups on the surface of carbon black, that is, when the volatile content is high, it can eliminate the genes generated during polymer decomposition, thus enhancing the protective effect.
    Through experiments, it was found that after using colorants, the color of polymer materials can reflect ultraviolet rays, preventing them from entering the interior of the material, acting as a shielding layer to avoid light aging. Carbon black, zinc oxide, cadmium red, cadmium yellow, phthalein white powder, and organic pigments phthalocyanine blue and phthalocyanine green all have this effect, among which carbon black has the best effect. The addition of carbon black in rubber can play a reinforcing role and also play an anti-aging role, so it is not necessary to add anti-aging additives, and the same is true for the addition of carbon black in plastics.