| 配制方法： |
To prepare a basic gel using this procedure, 8-15% of polyethylene (M.W. 1500-2000) is dissolved in mineral oil at 90C-95C, using a propeller type mixer with moderate agitation. After complete solution is achieved, the propeller stirrer is replaced with an Eppenbach Homo Mixer. The speed of the Homo-Mixer is adjusted to produce moderate turbulence in the solution. This mixing operation is continued until the mixture has air-cooled to 65C (approximately 10C below the cloud point). The Homo-Mixer is then replaced by a conventional loop or paddle mixer to minimize air entrapment in the formulation. Cooling with moderate agitation is continued until the temperature drops to about 45C, and the preparation is then poured into tubes or jars. The mixture forms a gel after packaging as further cooling occurs, and it reaches maximum consistency within 24 hr. When perfumed formulations are prepared, the fragrance is conveniently incorporated after the mixture has cooled to 50C. |