Cosmetics is a mixture of various materials scientifically formulated. There are many kinds of raw materials for cosmetics, and they cover a wide range. Among them, synthetic substances account for a large proportion, and the application of natural raw materials and biochemical preparations is also increasing. The safety, quality, and characteristics of cosmetics are closely related to the composition of raw materials that constitute cosmetics, in addition to being closely related to the preparation technology and production equipment.
The raw materials used in the production of cosmetics must comply with the requirements listed in the "Cosmetic Hygiene Code" (2002 edition), strictly abide by the non-use of "prohibited substances in cosmetic components", and the "restricted substances in cosmetic components and limited antiseptics" The selection of "agents, limited UV absorbers, limited colorants" must also meet the requirements of the restrictions, that is, the applicable and/or use range, the maximum allowable concentration, etc. According to the role of raw materials in cosmetics, cosmetic raw materials can be roughly divided into three categories: matrix raw materials, auxiliary raw materials and functional raw materials.
Among the auxiliary materials, colorants can give cosmetics a pleasing color, such as cleansing cosmetics shampoo, bath liquid, hand sanitizer, etc. After adding trace pigments, it can not only hide the color of the raw materials, but also very popular. Colorant is an indispensable important raw material for color beauty cosmetics, such as lipstick, eye shadow, rouge, etc.
The role of colorants in cosmetics is mainly to beautify the appearance and affect the consumer's psychology-shopping desire, but may affect human health, so when selecting colorants, we must strictly abide by China's "Cosmetics Hygiene Code" for cosmetic components Restricted colorants allow the use range and concentration requirements.
Colorants for cosmetics can be roughly divided into the following categories:
1. Organic synthetic pigments can be divided into dyes, pigments and lakes. Dyes can be dissolved in solvents such as water, oil, drunk, etc., and dare to dye cosmetics with the help of solvents; pigments and lakes are insoluble in water and oil, and are generally dispersed in the form of fine particles in the cosmetic matrix to dye them. Hiding power.
2. Inorganic (mineral) pigments have a long history of application. They are mostly directly extracted and refined from ore sand. They have good heat resistance and light resistance. They are insoluble in water and oil. They are mostly used in beauty cosmetics and are safe to use. . Commonly used pigments are white pigment titanium dioxide, zinc white powder, bismuth oxychloride (BiOCl), silver aluminum powder and colored pigments iron oxide red, iron oxide yellow, iron oxide black, chromium oxide green, iron blue, ultramarine, carbon black, etc.
3. Natural pigments There are not many natural pigments used in cosmetics because of their limited resources and high prices. Due to the natural fashion trend of cosmetics consumption, in recent years, attention has also been paid to the research on the development and extraction technology of natural color cords. The natural pigments used in cosmetics include henna red, comfrey, sorghum red, cochineal red, and β-carrot Element, chlorophyll, etc.
4. Pearlescent pigment This is a pigment with a pearl-like shining luster. It changes with the thickness of the coating film, causing light interference and producing a shining luster. The main component of pearlescent pigment is bismuth oxychloride or titanium mica. Depending on the thickness of the film, red, yellow, cyan, blue and green pearlescent pigments can be prepared.
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