Sun cream containing natural sun-prevention component and preparation method thereof
Patent Information
- Authority / Receiving Office
- CN ยท China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- NANJING UNIV OF INFORMATION SCI & TECH
- Publication Date
- 2009-04-15
- Estimated Expiration
- Not applicable ยท inactive patent
Abstract
Description
technical field
[0001] The invention relates to a sunscreen and a preparation method thereof, in particular to a sunscreen containing natural sunscreen ingredients extracted and formulated from grape leaves, sweet-scented osmanthus and green tea and a preparation method thereof. Background technique
[0002] Ultraviolet rays can be divided into short-wave (190-280nm), medium-wave (280-320nm) and long-wave (320-400nm). Short-wave ultraviolet light has the shortest wavelength and the strongest energy, but it can be absorbed by the ozone layer 25 kilometers above the ground and cannot reach the ground, so it will not cause sunburn to the skin. The ultraviolet bands that cause sunburn to the skin mainly include medium wave and long wave. Among them, the transmission ability of medium-wave ultraviolet rays can reach the ground, which is the main band that causes skin sunburn and is also the key band for sun protection. It is generally called "ultraviolet rays in the B area (UVB)...