Salicylic acid is a fat soluble organic acid with the chemical formula c7h6o3. The appearance is white crystalline powder, and the melting point is 158 ~ 161 ℃. It exists in willow bark, white pearl leaves and sweet birch in nature. It is an important fine chemical raw material and can be used for the preparation of aspirin and other drugs.
Function and Use
1. Standards for alkalimetry and iodometry titration. Fluorescent indicator, complex indicator.
2. This product is used as anti scorching agent and UV absorber and foaming agent in rubber industry.
3. Used as coordination indicator and coordination masking agent. Color developer and preservative for titanium, zirconium and tungsten plasma.
4. Salicylic acid is used as an additive in some weak acid electrolytes and as a complexing agent for electroplating or electroless plating.
5. Cosmetic preservatives. It is mainly used in water cosmetics such as toilet water, prickly heat water and quinine head water. In addition to antisepsis and sterilization, it also has the functions of dispelling sweat and odor, relieving itching and swelling, relieving pain and inflammation.
6. It is mainly used as the raw material of pharmaceutical industry to prepare aspirin, sodium salicylate, salicylamide, Zhitongling, phenyl salicylate, xuefang-67 and other drugs. The dye industry is used to prepare mordant pure yellow, direct brown 3gn, acid chrome yellow, etc. It is also used as rubber vulcanization retarder and disinfection preservative.
7. It can be used as accelerator for curing epoxy resin and preservative. It can be used to prepare synthetic spices such as methyl salicylate and ethyl salicylate. The dye industry is used as raw materials for the preparation of direct dyes and acid dyes. It can also be used as rubber anti scorching agent, disinfectant, etc.
8. a small amount is used for preparing animal flavors and other daily flavors. Trace is used in food as a preservative. It is an important raw material for the pharmaceutical industry.
Comparison with fruit acid
Only dermatologists can perform the skin replacement of fruit acid with a concentration of more than 50%, and salicylic acid skin replacement, regardless of the concentration, is classified as medical treatment. It is worth noting that a few people are not suitable for using salicylic acid of any concentration, so it is impossible to perform in general beauty salons. It is legally allowed to perform skin replacement of fruit acid with a concentration of less than 40% in beauty salons, In contrast, fruit acid is much safer than salicylic acid. As for the effect, salicylic acid is only locked in the superficial stratum corneum, which only plays a role of simple treatment and blocking. It is only temporary to change the skin texture, while fruit acid enters the dermis to fundamentally change the skin texture, which can be cured. As for the acne pits formed by dermal damage, salicylic acid is powerless, so salicylic acid can not be called "salicylic acid skin replacement", It can only be called "salicylic acid treatment". The safety and effect of salicylic acid skin changing and fruit acid skin changing are different, because fruit acid is non-toxic and can be used from low to high (8% - 15% - 20% - 30% - 40%). Salicylic acid is toxic. Too high concentration is not suitable for use on the face. There is a certain concentration limit. Salicylic acid with a concentration of 3% - 6% can be used to exfoliate, more than 6% is corrosive to the skin, and 40% of high concentration salicylic acid has strong cutin corrosive properties.
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