化学原料分析(国外英文资料).docVIP

化学原料分析(国外英文资料) Main material 2.1 oily raw materials 2.1.1 oily raw material is the main base material of cosmetics, chemicals are generally called oil, fat and wax. Oil is usually liquid at room temperature and solids are fat. Used olive cosmetics oil, macadamia nut oil, jojoba oil, lanolin etc.. Wax are common earth wax, microcrystalline wax etc.. There are petroleum hydrocarbons, such as white oil and so are our common. 2.1.2 oily raw materials have special physical and chemical properties 2.1.3 physical properties include color, odor, density, viscosity, melting point, freezing point, expansion, etc., which directly affect the process, quality and appearance of the formula. Generally speaking, natural sources of oily materials have peculiar smell and color, which are the fatal weakness of cosmetics, while synthetic and semi synthetic raw materials have obvious improvement in odor and color. Oily ingredients have a great influence on the viscosity of cosmetics, and viscosity is related to the spread, smearing and stability of cosmetics. 2.1.4 in the chemical index, saponification value, iodine value is usually used to measure its quality. The saponification value of oil is usually 180~200, which is used to measure the molecular weight of fatty acids in oils and fats. The lower the saponification value, the higher the number of carbon atoms in the fatty acids, indicating the greater the molecular weight of fatty acids. Vice versa。 The iodine value is used to measure the oil saturation, the greater the iodine value, the higher the degree of unsaturation, containing more unsaturated bond, easily oxidized in air, prone to spoilage and other quality problems. Another indicator is acid value. Acid value is an index to measure the freshness of fat, and the acid value of fresh fat is below 1. 2.1.5 in fact, these chemical indicators of oil determination, quality control department is more familiar with. Id like to talk about some of my recipes. Different oils have differe