Moisturizing and moisturizing are not difficult to understand from the literal, if we explain from the skin hierarchy, this simple topic will be complex. If we consider the formula, it will involve complex chemical problems, such as water absorbent, moisturizer, hydrophilic, lipophilic, oil in water, water in oil and so on. All these make the simple maintenance become academic research Miscellaneous.
From the strict dermatology, moisturizing and moisturizing is mainly a maintenance work for the cuticle. When the moisture content of the cuticle is 10-15%, it is the most comfortable and balanced state for the skin. When this value is lower than 10%, our skin begins to feel dry. When it is higher than 20%, the skin will feel unable to breathe, and the structure of the skin determines that the skin can not exist Supersaturated water, so moisturizing work as long as you can maintain the normal value of 10-15% moisture content of the cuticle.
Understand the principle of the composition of the stratum corneum moisture content and the structure of the cuticle, then it is not difficult to understand the replenishment and moisturizing. Replenishment is to supplement water and those water-soluble intercellular substance. Moisturizing depends on the fat soluble intercellular and sebum membranes. Therefore, many times we choose to make up the make-up water first, then moisturize the essence and face cream. Then we use oil to lock water. When we apply the maintenance products on the skin, the hydrophilic substances will automatically dissolve with the hydrophilic substances in the intercellular matrix, the lipophilic substances will automatically dissolve with the lipophilic substances, and the triglycerides will stay in the sebum membrane to perfect and strengthen this film, which will make our skin feel water and moist.