During the cosmetic packaging process, which chemicals may corrode the disc press caps of lotion bottles?

In the process of cosmetic packaging, the disc-type press cap of the lotion bottle, as an important component that directly contacts the product, needs to face the challenges of various chemicals. These chemicals may corrode the disc-type press cap of the lotion bottle, thereby affecting the safety and stability of the product. The following are several chemicals that may corrode the disc-type press cap of the lotion bottle:

Acidic substances: Cosmetics often contain some acidic substances, such as citric acid, lactic acid, etc., which are used to adjust the pH value of the product or as preservatives. When these acidic substances come into contact with the disc-type press cap of the lotion bottle, they may react chemically with its surface, causing corrosion or discoloration of the material.

Alkaline substances: In contrast to acidic substances, some cosmetics also contain alkaline substances, such as sodium hydroxide and potassium hydroxide. These alkaline substances may also corrode the disc-type press cap of the lotion bottle, especially when it comes into contact with the aluminum part, which may accelerate the oxidation and corrosion of aluminum.

Solvents and organic solvents: Various solvents and organic solvents are often used in cosmetics, such as ethanol and propylene glycol, to dissolve or dilute other ingredients. These solvents and organic solvents have strong permeability and dissolving power, and may penetrate into the material of the disc press cover of the lotion bottle, causing the material to swell, soften or lose elasticity.

Oxidants and reducing agents: Oxidants and reducing agents that may be present in cosmetics, such as hydrogen peroxide, sodium sulfite, etc., may trigger redox reactions when in contact with the disc press cover of the lotion bottle, causing the surface of the material to discolor, oxidize or lose gloss.

Flavors and pigments: Flavors and pigments are common additives in cosmetics, used to give products specific fragrances and colors. However, some ingredients in these additives may react with the material of the disc press cover of the lotion bottle, causing the material to discolor, fade or produce odor.

In the process of cosmetic packaging, in order to reduce the risk of corrosion of the disc press cover of the lotion bottle by these chemicals, the following measures can be taken:

1. Select materials with excellent corrosion resistance to make the disc press cover of the lotion bottle, such as aluminum-plastic composite materials.

2. Surface treatment and coating of the disc press cover of the lotion bottle to enhance its corrosion resistance and anti-permeability.
3. Strictly control the types and concentrations of chemicals in cosmetics, and avoid using substances that are highly corrosive to the disc-type press caps of lotion bottles.
4. During production and storage, be careful to avoid direct contact between the disc-type press caps of lotion bottles and chemicals to reduce the risk of corrosion.