| Improvement of Test Method for 45 µm Sieve Residue Weight of Precipitated Silica |
| Received:May 10, 2022 Revised:May 10, 2022 |
| DOI：10.12136/j.issn.1000-890X.2024.05.0389 |
| Key Words: precipitated silica；45 µm sieve residue；soaking；washing；test |
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| Abstract: |
| The testing method for 45 μm sieve residue weight of precipitated silica（5 g） was improved.The results showed that the sample was soaked in sodium hydroxide（NaOH） solutiona with volume fraction of 3% and stirred at low speed for 10 min，the sample had a shorter washing time and better washing effect，and the repeatability of 45 μm sieve residue weight test value was higher.After conducting four parallel tests on the micro bead shaped samples before and after soaking in NaOH solution，the reproducibility precision of 45 μm sieve residue weight test value met the requirements of national standard，so that soaking the sample could significantly shorten washing and save the water consumption. |
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