胃十二指肠内窥镜检查时,各医院均用硅油作消泡剂。但由于本品货源不足,我们经过实验选择了理化性能与硅油相似的精制玉米油作为其代用品,取得了满意的效果。玉米油的消泡机理与硅油相同,两者都是表面张力小的物质;当加到液体和空气组成的液-气溶液中时,改变了气泡壁表面张力的平衡。水的表面张力为72dyn/cm~2,而硅油、玉米油均为20dyn/cm~2左右,使泡沫壁的表面张力降低,由于局部受力不均匀发生破裂而消泡。 Gastroduodenal endoscopy, the hospital used silicone oil defoamers. However, due to the lack of supply of this product, we selected the physical and chemical properties of refined corn oil similar to the silicone oil as a surrogate, and achieved satisfactory results. The defoaming mechanism of corn oil is the same as that of silicone oil, both of which are substances with a small surface tension; when added to a liquid-gas solution consisting of liquid and air, the balance of the surface tension of the bubble wall is altered. The surface tension of water is 72dyn / cm ~ 2, while the silicon oil, corn oil are about 20dyn / cm ~ 2, so that the surface tension of the foam wall decreases due to uneven partial pressure rupture and defoaming.