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氧化鋅
Zinc oxide
Zinc oxide, an inorganic compound with the formula ZnO, manifests as a white powder insoluble in water. Extensively utilized as an additive in a myriad of materials and products, including cosmetics, food supplements, rubbers, plastics, ceramics, glass, cement, lubricants, paints, sunscreens, ointments, adhesives, sealants, pigments, foods, batteries, ferrites, fire retardants, semiconductors, and first-aid tapes. Although zinc oxide naturally occurs as the mineral zincite, the majority of zinc oxide is produced synthetically.
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Uses in Cosmetics
Zinc oxide boasts a variety of effects and applications in cosmetics, as highlighted below:
It acts as a sunscreen, effectively blocking UVA and UVB radiation to protect the skin from sun damage.
It possesses antibacterial properties, useful in treating skin conditions such as diaper rash and acne.
As a skin protective agent, it's applied in preventing and treating skin irritations and inflammations.
Source
Most zinc oxide is produced synthetically, encompassing direct, indirect (French process), and wet chemical methods.
The direct method involves heating zinc-containing materials to high temperatures, vaporizing them, and then reacting with the air to form zinc oxide.
The indirect method involves vaporizing metallic zinc at high temperatures and then allowing it to react with the oxygen in the air to form powdered zinc oxide.
The wet chemical process starts with aqueous solutions of zinc salts, from which zinc compounds are precipitated and then calcined at temperatures around 800°C to produce zinc oxide.
Globally Harmonized System of Classification and Labelling of Chemicals
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