What is the role of propylene glycol in cosmetics?

Propylene glycol is a chemical reagent. This reagent is very unfamiliar to many people. It has a very wide range of uses. For example, it can appear in cosmetics. What are the functions of propylene glycol in cosmetics? Propylene glycol, this kind of ingredient is almost found in most cosmetics because it is a solvent ingredient, the following will introduce the role of propylene glycol in cosmetics. Propylene glycol is insoluble in water or glycerin; it can be dissolved in ethanol, 1,2-propylene glycol, isopropanol, soybean oil, etc. when heated. Its molecular structure is dominated by hydrophobic groups and belongs to a W/O type emulsifier. At present, the main preparation methods of propylene glycol include direct hydration of propylene oxide, indirect hydration of propylene oxide, and direct catalytic oxidation of propylene. 

1. Propylene glycol is added to skin care products and is generally used in lotions and essences. Because it is a polyol type, it is a small molecule moisturizing ingredient, which can lock in moisture and play a moisturizing role, but its water absorption is relatively weak and moisturizing. 

General effect. It can help the penetration of active ingredients, and also help with antiseptic ability, but it is irritating to the skin and eyes. 

2. 1,2-Propanediol has a lower cost, better antifreeze effect, and certain antibacterial effect; 1,3-Propanediol is relatively less irritating to the skin and is more natural and safe, but its cost is higher. Generally, most low-end skin care products contain 1 or 2 propylene glycols. Remember to check the ingredient list when purchasing. 

3. Hygroscopic propylene glycol, such as commonly used ointments, masks, lotions, facial cleansers, essences, makeup removers, moisturizing lotions, and plant extracts, can be seen in this ingredient. 

4. It is generally a common hydrophilic and moisturizing ingredient in makeup removers. Its real effect is to help dissolve dirt and prevent the skin from drying out too quickly during makeup removal. It is also often used in lotions and essences. 

Propylene glycol used in cosmetics is not 100% added to propylene glycol. The general content is about 1% to 10%. Propylene glycol is not a prohibited substance in cosmetics, nor is it a restricted substance in cosmetics. 

Propylene glycol is almost colorless, odorless, non-greasy, completely soluble in water, and has antiseptic properties. Propylene glycol has strong penetration as a slip agent and can help other ingredients spread and penetrate on the skin surface, but when used as a moisturizing agent, the proportion of water catching is not high. 

The amount of propylene glycol added is controversial. In general cosmetics, the proportion of propylene glycol will not exceed 5%. A few people will experience a stinging and burning sensation after using it. However, it is better to avoid using this ingredient for sensitive skin, and there is no need to worry too much about healthy skin. Propylene glycol has a certain role in cosmetics, so does propylene glycol have any side effects on the skin? Generally, the concentration of propylene glycol added in cosmetics is about 5% or less, which generally does not affect the skin. However, it is necessary to pay attention. If it is used for a long time and excessively, it will cause damage to the skin, especially sensitive skin. The possible side effects of propylene glycol on the skin include the following: 

(1)Irritant: Some people experience subjective burning, tingling, and itching when using it. 

(2)Degreasing: Propylene glycol has the characteristics of a fat-soluble solvent, with strong permeability and high solubility. Excessive use may cause harm to the skin. Long-term use of high concentrations of propylene glycol will affect the epidermis and sebum structure. 

(3)Irritant dermatitis: Propylene glycol is irritating to the skin and mucous membranes. The higher the concentration and the tighter the seal, the greater the irritation, which will cause skin redness, rash, peeling, itching, and rough skin. situation.