1. Oil phase
Add the oil wax ester emulsifier and other oil-soluble ingredients into the oil pan, turn on the heat, and stir the ester at 70-75 ° C until it is fully melted or evenly dissolved. (Note: Avoid excessive heating and long-term heating to prevent oxidation and deterioration of raw materials)
2. Water phase
First, add deionized water to the water pot, add water-soluble components and water-soluble emulsifier, stir and heat at 90-100℃, maintain sterilization for 20 minutes, and then cool at 70-80℃ for use.
If it contains water-soluble polymers, it should be prepared separately, dissolved in water, fully stirred and expanded at room temperature to prevent agglomeration, homogenization if necessary, adding water phase before emulsification, avoiding long-term heating to avoid viscosity changes, more than 3%-5% of water can be added to supplement the volatile water during heating emulsification.
3. Emulsification and cooling
The above two-phase materials are added to the emulsifying pot in a certain order and stirred at a certain temperature for a certain time.
In the emulsification process, the addition method of oil phase and water phase, adding speed, stirring condition, emulsifying temperature and time, emulsifying agent structure and type have great influence on the shape and distribution of emulsifying particles.
The homogenization speed and time of different emulsion systems are different. For systems containing water-soluble polymers, the homogenization speed and time should be strictly controlled to avoid excessive shear, damage to the polymer structure, cause irreversible changes, and change the rheological properties of the system.
If the formula contains vitamins or heat-sensitive additives, it should be added at a lower temperature after emulsification to ensure its activity, but pay attention to its solubility. After emulsification, the emulsifying system should be cooled to near room temperature. The discharge temperature depends on the softening temperature of the emulsifying system. In general, it should be able to flow out of the emulsion tank by its own gravity. It can also be pumped out or pressed out by pressurized air.
4. Aging and filling
Generally, it is stored and aged for a day or several days before being filled with a cosmetic cream filler. Check product flavor and appearance before filling.
Check the quality index again, the quality is qualified before filling.
In the actual cosmetic cream manufacturing process, although similar formulas are used, the stability and other physical properties of the prepared products are also different due to the different temperature, emulsification time, feeding method and mixing conditions during the operation. Therefore, you can choose the right preparation method according to different formulations and different requirements to obtain high-quality products.
