Prevent the growth of microorganisms, reasonably extend the shelf life of the product, and ensure that the product will not deteriorate due to various pollutions during use. The maintenance ingredients in skin care products are mostly natural organic substances such as amino acids, proteins, sugars, vitamins, vegetable gums, etc., all of which are excellent environments in which bacteria and microorganisms breed, so preservatives are commonly added during the manufacture of skin care products ingredient. Common anti-corrosion classification:
1, 2-Bromo-2-nitropropane-1,3 diol, iodopropynol butyl carbamate
The former should avoid the formation of nitrosamines and banned in Japan, the latter can only be used in acidic environment and can not be used for lips and oral products.
2, Phenols
For example: phenethyl alcohol, phenoxyethanol, benzyl alcohol. Phenoxyethanol is often found in shampoo formulations and is relatively mild and hypoallergenic. Benzyl alcohol is listed as a fragrance allergen by the European Union;
3, Acids
Potassium sorbate, benzoic acid, sodium benzoate, dehydroacetic acid, salicylic acid. The anti-fungal effect is good, and the bacteria are average. Salicylic acid has an exfoliating effect on the skin.
4, Formaldehyde releaser
Including: 1,3-Dimethylol-5, 5 dimethylhydantoin (DMDMH), dimetoxyalkyl urea, imidazolidinyl urea, diazoimidazolium urea, quaternary ammonium salt-15, urea , DMDM Hydantoin (acid-tolerant is more suitable for acidic formulations, mainly used in shampoos, conditioners, makeup and foundation), etc. When the word "urea" is used, it can be simply and roughly regarded as a formaldehyde donor preservative. Excellent antiseptic effect.
5, Kason
Name of ingredient list: methyl isothiazolinone (MIT), methyl chloroisothiazolinone. It is widely used in personal care products and industrial applications, with skin sensitization and cell and nerve hazards.
