卡波泊尔凝胶的流变学研究

Rheological properties of carbopol gels

本文采用 Rheotest 2型旋转式粘度计,锥板测定法对国产及进口 Carbopol 940凝胶的流变学特性进行研究。结果表明:国产与进口 Carbopol 940凝胶流变学特性相同,均为塑型流体,属非牛顿流体;加碱中和后在 pH7～9时此凝胶粘度最大。1%凝胶粘度的光降解速度符合一级动力学,日光下 Y_(1/2),分别为21.7,33.0d。其粘度对室温,冷藏和冰冻贮存稳定,并可耐受热压灭菌。

The rheological properties of Carbopol 940gels made in RITA Corp.(USA) and China wereinvestigated by continuing shear viscometry us-ing Rheotest 2 cone and plate device.The resultsindicated that carbopol gels provided plastic flowcurves.The rheological properties of importedCarbopol 940 gel was similar to those of carbopolgel made in China.Apparent viscosities variedwith concentration.The neutralized gels hadmaximum viscosities at pH7～9.The gels exhib-ited a relatively small variation in viscosity withtemperature at room temperature,cold,frozencycling and ageing,even though autoclave steril-ization.Daylight reduced viscosity,followed bythe first order reaction kinetic with T_(1/2) 21.7～33.0 days.