Diamond Silver White Pearlescent Pigment Wholesale

What effects do light and oxygen have on the shelf life of diamond silver white pearlescent pigments?
Diamond silver white pearlescent pigments are widely used in a variety of fields, such as cosmetics, coatings, plastics, and printing inks, due to their unique luster and high brightness. However, this pigment may be affected by light and oxygen during storage and use, which may affect its shelf life and performance. This article will explore in detail how light and oxygen affect the shelf life of diamond silver white pearlescent pigments and provide corresponding preventive measures.
The effects of light, especially ultraviolet (UV) light, on pearlescent pigments are mainly reflected in the following aspects:
- Photooxidation refers to the oxidation reaction of chemical components in pigments under light, especially UV light. This reaction can cause the decomposition or deterioration of the pigment, which in turn affects its optical properties.
- Titanium dioxide (TiO2) is often used in the coating layer of pearlescent pigments. Although it has good light stability, it can also generate active oxygen species (such as free radicals) under UV irradiation, which can further cause the degradation of the pigment core.
- Some pearlescent pigments will change color under UV irradiation, which is a phenomenon called photochromism. This can lead to unstable appearance and color of the pigment, affecting its application effect.
- Especially in outdoor applications, long-term exposure to sunlight can accelerate this discoloration phenomenon.
- Photoaging refers to the physical and chemical changes that occur in materials under light, including fading, loss of gloss and mechanical properties of the pigment.
- UV rays can cause degradation of the coating and substrate, reducing the durability and stability of the pigment.                                                                                                                                                              The effects of oxygen on pearlescent pigments, especially when combined with light, are mainly manifested in the following aspects:
- Oxidation reaction refers to the reaction of oxygen with the chemical components in the pigment, causing it to decompose or deteriorate. For example, the metal oxide coating may undergo further oxidation in the presence of oxygen, affecting its protective properties.
- Pigments containing metal components, in particular, are more susceptible to oxidation reactions under the action of oxygen, resulting in changes in the gloss and color of the pigment.
- Oxygen can accelerate photooxidation reactions. The reactive oxygen species generated by light will react with oxygen to form more free radicals and peroxides, which will further attack the molecular structure of the pigment, causing the pigment to degrade faster.
- In high temperature and high humidity environments, oxygen will accelerate the oxidative degradation process of pigments. This degradation not only affects the chemical stability of the pigment, but also leads to changes in the physical structure of the pigment, such as particle agglomeration and reduced dispersibility.

How to prevent the influence of light and oxygen on diamond silver white pearlescent pigment?
In order to extend the shelf life of diamond silver white pearlescent pigment, a series of measures need to be taken to prevent the influence of light and oxygen:
Using high-quality coating materials such as titanium dioxide (TiO2) and silicon oxide (SiO2) can effectively block ultraviolet radiation and reduce the occurrence of photo-oxidation reactions.
Multi-layer coating technology can further improve the light stability and antioxidant properties of the pigment.
Adding antioxidants and UV absorbers:
Adding antioxidants and UV absorbers to the pigment formula can capture active oxygen species and free radicals and slow down the progress of photo-oxidation reactions.
Commonly used antioxidants include BHT (butylated hydroxytoluene) and Hindered Amine Light Stabilizers (HALS), while UV absorbers include UV-328 and UV-531.
Storing pearlescent pigments in a light-proof environment and using opaque packaging materials such as aluminum foil bags or dark containers can effectively prevent ultraviolet radiation.
During storage and transportation, try to avoid exposing the pigment to sunlight to reduce the risk of photo-aging.
Use packaging materials with good sealing performance to prevent oxygen and moisture from entering. Vacuum packaging or nitrogen-filled packaging are commonly used methods to effectively isolate oxygen and extend the shelf life of pigments.
Check the sealing of the packaging regularly to ensure that it is intact.
Store pigments in an environment with suitable temperature and low humidity. The ideal storage temperature is 10°C to 30°C, and the humidity should be kept below 50%.
Avoid high temperatures and extreme temperature fluctuations, which will help reduce the occurrence of oxidation and photooxidation reactions.