The formula of a shampoo includes the following parts: surfactant (cleaning function, thickening and adhesion), cationic conditioner (making hair smooth, but it should be one of the causes of dandruff), preservative (mostly phenoxyethanol), chelating agent (various EDTA) and functional additives (such as plant extract, dandruff remover, etc.). ), oil (including glycerol), water and essence pigment. Let's say the same thing.
1. The concept of surfactant surface activity refers to amino acids and soap groups of facial cleanser.
The surfactant of most shampoos in the world is AES, and the Chinese INCI name is sodium lauryl polyether sulfate. Look at the ingredient list of the shampoo you use, there must be it or its younger brother, ranking in the top two (representing a large amount of addition). AES is a very cheap thing, its function is thickening, foaming and cleaning. But it has a big problem, that is, it is likely to be accompanied by carcinogen dioxane in the production process. At the same time, AES is irritating, which is the chief culprit of pain after shampoo enters the eyes. In order to reduce its irritation, other mild surfactants such as betaine are often used to reduce its irritation. However, it is not recommended to use sensitive scalp for a long time, which is a vicious circle. ?
Amino acid shampoo is mild and non-irritating, and the surface activity of children's tear-free formula can be it. However, the biggest problem of amino acid shampoo is poor foaming, low viscosity, bad head feeling and easy to feel unclean. Reference the feeling of amino acid facial cleanser. Moreover, the grease on the hair is more likely to absorb dust, and this feeling of not being cleaned will only be infinitely amplified. But it is really gentle and non-irritating, and it is the best choice for sensitive scalp. Another disadvantage is that it is expensive. Amino acid shampoo is definitely expensive, but it is not necessarily expensive. ?
It should be noted that many so-called amino acid shampoos on the market are still AES-NaCl system, that is, soap-based system, which depends on the ingredient list. Many of these fake amino acid shampoos just add various amino acids. The added amino acids are useless. If you add a few percent of beer, you can claim that there are more than a dozen amino acids. Is it useful? No. Be sure to distinguish, real amino acid shampoo is very expensive! Because amino acid surface activity is really expensive! This is our job. I fainted in the toilet. . . ?
2. Cation regulator
If you have a feeling that a shampoo is good at first, but then dandruff is more and more, then it is the culprit. Polyquaternary ammonium salt is a kind of cationic regulator. It will make your hair smooth and won't be entangled in static electricity. Is an indispensable thing. ?
3. preservatives? There are many preservatives, most of which are not good. For example, phenoxyethanol and sodium benzoate are commonly used preservatives. ? Phenoxyethanol is a low-irritating preservative, which may irritate the skin and bring a burning sensation, and it is also the reason why shampoo hurts when it enters the eyes. At present, it has been banned in skin care products for infants under three years old. Shiseido's Speiche preservative is it. ? Sodium benzoate is an acidic preservative with low toxicity. For toxicological reasons, Japan has stopped the production of this ingredient and restricted its use. But what skills? Shampoo, like the most popular Schwartz preservative, is it. ? So it's so bad, why use them? Because it's cheap. With so many preservatives, what is the best and safest? Of course, it is a polyol preservative system, which is called non-preservative (that is, preservative and humectant), but. . . This needs money. It is very expensive. . . ?
4. Chelating agent? There is nothing to say. Basic ingredients must be used. ?
5. Functional ingredients? What if the stimulated hair has dandruff? Zpt, of course Haha, the Chinese name is zinc pyrithione. Dandruff removal inhibits sebum secretion. Whether plant extracts such as ginger root extract and ginseng extract are useful depends on the supplier. ?
6. Oil, water, essence and pigment? Shampoo is 70% water. Flavor pigments are also essential, and of course natural pigments will be better. Take grease as an example. Silicone oil is a film-forming agent, which is not as bad as advertised. What else is cetearyl alcohol? It's all grease.