1. It is not ideal if the powder to be tested is suspended in the water or dispersed in water. An aqueous solution of glycerin or ethanol may be used as a medium, and the ultrasonic dispersion is tested in the sample cell.
2, the ultrasonic dispersion time is about 15-30 seconds, the test results are stable, not beating, it means uniform dispersion. Some samples have low strength and too long ultrasonic dispersion time, which will make the test results more and more fine: if the dispersion time is too short, the sample will not be fully dispersed, which will affect the test results.
3. When some samples are dissolved in water, use alcohol, isopropanol, glycerin or a saturated solution of the sample as a medium. Some special powders require corrosive media such as n-heptane, so you must replace the special parts or use the test tube static test (no need to replace any parts, please contact the manufacturer).
4. In order to make the sample evenly dispersed, it is generally necessary to add a dispersing agent. Commonly used dispersing agents are sodium hexametaphosphate, sodium silicate, sodium polymetaphosphate and the like. According to experience, dishwashing detergent and water (1:3) are generally used as dispersing agents, and 1~2 drops are added each time with a plastic pipette. Do not use too much, otherwise bubbles will form. Affect the accuracy of test results. The type and amount of dispersant are determined by the user's test. In principle, the dispersing effect is equivalent, and it can be used less or not.
5. In general, the amount of sample added is about 0.1-0.5g. The amount of powder added varies from sample to sample. The finer the powder, the less the sample is used.
6. The particles tested by the laser particle size analyzer are regarded as equivalent spheres when processed by computer. The measured samples are in the form of sheets, rods, needles, etc., when the maximum size or the minimum size is on the mating surface, the difference between the two test results It will be very large, because the probability that the maximum size is on the face-up surface is greater than the minimum size of the sample under flow conditions, the more obvious the feature, the greater the probability deviation. The results in the objective case of the reaction are thicker than those in the case of equal probability. The test can be considered in the test (ie, selecting a more detailed test).
Chengdu Jingxin Powder Testing Equipment Co., Ltd. develops and produces more than 20 series of powder testing instruments, nano laser particle size analyzer, dry and wet laser particle size tester, dry laser particle size analyzer, wet laser particle size analyzer, spray laser particle size Instrument, specific surface area tester, particle image analyzer, tap density meter, true density meter, powder comprehensive characteristic tester, online control particle size analyzer, etc. have their own characteristics and advantages. The series laser particle size analyzer has won the trust of more and more customers with its high test accuracy, good repeatability, wide test range and excellent performance.
The instrument is widely used in research institutes and powder production enterprises of universities and colleges, such as paper, electronics, cement, pesticides, pharmaceuticals, paints, ceramics, non-metallic mineral powders/metal powders, refractory materials, plastics, rubber, petrochemicals, etc. The industry has successfully provided powder particle size detection solutions for many customers. The products are sold well in China and exported to North America, Europe, Russia, India, Taiwan, Hong Kong and other places.
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