General basic sunscreen formula, need to consider a few points: sunscreen, oil selection; Synergistic agent, film-forming agent collocation; The realization of clear skin and toning sense. Therefore, this has to mention the importance of silicone materials in sunscreen formulas
1. The skin feels fresh and non-sticky -- volatile silicone oil
Sunscreen with strong sunscreen capacity is usually solid. In order to improve the user's refreshing and non-greasy feeling, it is necessary to mix with liquid grease sunscreen with moderate solubility, and add volatile silicone oil, especially in the W/O formulation system.
2. Double protection from sun and water - silicone film forming agent
Use the W/O sunscreen system, because most sunscreens are in the oil phase and the sunscreen components can be continuously spread, while the O/W system needs to be combined with water-soluble sunscreen and film forming agent to enhance the waterproof and sunscreen effect of the formula. Because oil-soluble sunscreen stays in the oil phase, sunscreen is easy to disperse discontinuously after application, thereby reducing the effectiveness of sunscreen.
3. Keep the system stable - silicone emulsifier
Usually emulsifier with strong emulsification ability, molecular weight is larger, hydrophilic and oleophilic group are large, skin feeling is thicker when used. Silicone emulsifier is often used in W/O emulsification system, relatively small molecular weight emulsifier, emulsifying force and stability will be weak, but the use of skin feeling will be refreshing, formula design needs to be used together.
4. Skin sensation regulator - silicon powder
The birth of powder raw materials, to provide more skin feeling style for sunscreen products, commonly used powder raw materials are: silicon powder, can improve the smoothness of the skin; Compound silicone powder makes the skin feel soft and stick to the skin more.