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答:微孔滤膜是由高分子的醋酸纤维素和硝化纤维素组成的混合纤维素酯制成的。本品对温度较为敏感,膨胀系数较大,其孔径也随温度变化而有一定程度的变化,故温度高时,过滤速度快,温度低时较慢。当过滤低温溶液时,因膜与过滤溶液的温度差较大,由室温突然降至0℃左右的低温时,膜的收缩率亦较大。由于膜的抗拉强度低,便造成膜的破裂,使过滤失败。为防止低温过滤时微孔滤膜的破裂,可将处理
A: The microporous membrane is made of a blend of cellulose acetate and nitrocellulose. This product is more sensitive to temperature, larger coefficient of expansion, the aperture also changes with temperature to some extent, so the temperature is high, the filter speed, low temperature is slow. When filtering low-temperature solution, the membrane due to the larger temperature difference between the filtered solution, suddenly dropped from room temperature to about 0 ℃ low temperature, the film shrinkage is also greater. Due to the low tensile strength of the membrane, the membrane ruptures and the filtration fails. In order to prevent the low temperature filtration when the microporous membrane rupture, can be handled