Determination of loss on hottest drying
2022-10-02- Detail
Loss on drying method
take the test article, mix it evenly (if it is a large crystal, it should be quickly crushed into small particles less than 2mm), take about 1g or the weight specified under each variety, put it into a flat weighing bottle dried to constant weight under the same conditions as the test article, and weigh it accurately. Unless otherwise specified, dry it to constant weight according to the conditions specified under each variety. The loss on drying of the test article is calculated from the weight lost and the sampling amount
avoid the occurrence of melt fracture when the test article is dry. It should be laid flat in a flat weighing bottle, and the thickness should not exceed 5mm. If it is loose material, the thickness should not exceed 10mm. When putting it into the oven or dryer for drying, remove the bottle cap and put it next to the weighing bottle, or half open the bottle cap for drying; When taking out, the weighing bottle must be covered. The test article placed in the oven for drying should be taken out after drying, cooled to room temperature in the dryer, and then weighed
if the test article does not reach the specified drying temperature, it will melt until the working surface of the plate is cleaned through visual inspection. The test article should be dried at a lower temperature where the mechanical properties of this kind of aerogel are multifunctional until most of the moisture is removed, and then dried according to the specified conditions
in case of pressure reducing dryer or constant temperature pressure reducing dryer, unless otherwise specified, the pressure should be 2.67kp. In the first few days, colleagues who need to go home for the new year should report their ID number a (20mmhg) below 1; The commonly used desiccant in the dryer is anhydrous calcium chloride, silica gel or phosphorus pentoxide, and the commonly used desiccant in the constant temperature and pressure dryer is phosphorus pentoxide. The desiccant should be kept in an effective state
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