Coating specific gravity cup operation for measuring the density of paint varnish
The operation of the coating cuvette to measure the density of the paint varnish 1. The range and description of the density refer to the mass of the liquid per unit volume at the specified temperature, that is, the relationship between the mass of the substance and the volume. Expressed in g/ml. Other Valve,Basket Filter,Stainless Steel Flange Filter,Welded Cast Steel Check Valve Zhejiang Meide Machinery Co.,Ltd , https://www.meidemachinery.com
The method is suitable for measuring the density of liquid paints, varnishes and the like in a specified temperature. The principle is to first calibrate the volume of the pycnometer using the density of the distillation disperser water, and then use the pycnometer to weigh the sample at a certain temperature. Further, the density of the sample is calculated based on the mass and volume of the sample.
2, instruments and materials
(1) Gravity cylinders, common pycnometers are 37ml, 50ml and 100ml, generally stainless steel "target=_blank> stainless steel or aluminum alloy. The shape of the pycnometer is as shown.
(2) The thermometer is indexed at 0.1 ° C, accurate to 0.2 ° C
(3) The water bath or the constant temperature chamber can be maintained within the range of ±0.5 °C of the test temperature if the accuracy is high, and can be maintained within the range of 0.2 °C for the production control.
(4) Analytical balance Requires high precision, accurate to 0.2mg.
3. Measurement method (1) Calibration of pycnometer This requires drying a solvent-clear metal pycnometer without leaving a residual flow meter after evaporation.
The pycnometer was placed at room temperature and then weighed. If high precision is required, the pycnometer can be continuously clear, dried and weighed until the difference between two successive weighings does not exceed 0.5 mg. At a test temperature of 23 ± 2 ° C, if the accuracy is higher, the pycnometer is filled with distilled water at a temperature of 23 ± 0.5 ° C and no more than 1 ° C.
Cover the pycnometer so that it has an overflow opening, and strictly guard against the bubbles generated in the pycnometer.
Place the pycnometer in a constant temperature water bath or in a constant temperature chamber until the temperature of the bottle contains a constant temperature of the bar coater. Wipe off the spilled fingers with an absorbent material and dry the outside of the pycnometer with an absorbent material to ensure that no spills will flow out. Weigh the pycnometer filled with tinplate distilled water immediately, 0.001% of the exact mass
note:
1. When directly operated by hand, the pycnometer will increase the temperature and cause more overflow of the overflow of the overflow agitator, and will leave fingerprints. Therefore, it is recommended to protect the hand with pliers and dry absorbent material to operate the pycnometer.
2. It is recommended to immediately weigh the filled pycnometer to minimize the loss of quality.
(2) Calculation of the volume of the pycnometer The solvent of the pycnometer is calculated by the formula (in ml)
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