Cosmetic preservatives play a very important role in the product, which can effectively extend the shelf life of cosmetics while avoiding contamination of the contents during use.
The cosmetic preservative has a very small molecule, which means that it does not fail when the skin care product is applied, but is absorbed by the skin. Prolonged use of products containing a large amount of cosmetic preservatives poses a potential hazard to the skin, especially Parabens preservatives, which can affect the health of the skin barrier, loosen the structure of the keratinocytes, and lead to rough skin and sensitivity.
The cosmetics used by people every day have high nutrient content, which is more suitable for the growth of microorganisms. Especially after opening the bottle cap every day, the cosmetics will be in contact with the air, which will accelerate the deterioration of the cosmetics. Therefore, the general manufacturers will add them during production. Certain cosmetic preservatives. There are many classifications for cosmetic preservatives.
1. Parabens (parabens):
Representative products: methylparaben, ethyl ester, propyl ester, butyl ester, isopropyl ester, isobutyl ester, sodium salt, etc., compounded with Liquapar PE of ISP (isopropyl isopropyl ester, isobutyl ester) , butyl ester is dissolved in phenoxyethanol). Parabens are safe, broad-spectrum, economical, and resistant to high temperatures, and are suitable for micro-acid to neutral environments. However, it has liMITed antibacterial ability, and the antifungal efficacy is only 1/50-1/500 of IPBC, and the water solubility is poor. Some common components in cosmetics such as nonionic surfactants, gelatin, polyethylene glycol, methylcellulose, etc., can be inactivated. Foreign reports: have caused breast cancer and photoallergenicity.
2. Formaldehyde release:
Representative products: Glydant Garlandan (DMDMH), Germall Jema (diazoimidazolidinyl urea), sodium hydroxymethylglycine (for basic systems), and compound: Glydant Plus Liquid (GPL), Liquid Germall Plus, IS-45, Germall Ben, etc. Usually water-soluble or soluble in polyol, the anti-corrosion effect is good, and it can achieve three-dimensional anti-corrosion. But there is formaldehyde release, easy to be allergic.
Representative products: Carson (isothiazolinone / chloroisothiazolinone, MIT / CMIT), Bropol, methyl dibromoglutaronitrile, IPBC, triclosan and the like. Good water solubility and good antibacterial effect. However, it is highly irritating. For example, Carson is highly irritating because it contains a large amount of magnesium salt and a carcinogenic organochlorine component, and is currently only used in rinse-off cosmetics. Both Carson and methyldibromoglutaronitrile are decomposed by organic sulfur compounds and peroxide impurities in amine oxides, ring-opening, inactivation, and cause skin irritation and allergy. Broport's contact with metal can cause discoloration and failure. IPBC air is highly susceptible to oxidative discoloration.
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