Shampoo, also known as shampoo and shampoo, is the most widely used shampoo and one of the most commonly used hair cosmetics. It is used to clean the grease, sweat dirt, cells falling off the scalp, foreign body dust, microorganisms, residue of styling products, odor, etc. secreted by human body attached to scalp and hair. And keep the scalp and hair clean and beautiful.

Foreign shampoos began in the early 1930s. Before shampooing, people mainly wash scalp and hair with soap, soap and washing powder, and then make liquid shampoo with coconut oil soap. However, soap-based shampoo has many disadvantages.

Especially in hard water, soap with potassium fatty acid as raw material will form sticky deposits when encountering calcium and magnesium ions in hard water, leaving residues on hair that are not easy to clean; Moreover, after washing your hair with soap, it will be sticky, dull and difficult to comb.

In the early 1940s, liquid emulsified shampoo and paste emulsified shampoo with sodium dodecyl sulfate as the main component came out. Compared with soap and soap, shampoo has several advantages: it has strong foaming and cleaning ability, and can produce rich foam even if the water quality is hard; Easy to clean, will not leave unnecessary sediment residue; Milder than soap products.

Baidu Encyclopedia-Shampoo