Som ett viktigt tillsatsmedel i moderna beläggningsformuleringar är kvaliteten på karboximetylcellulosa (CMC) direkt relaterad till prestanda och stabilitet för beläggningsprodukter . korrekt identifiering av kvaliteten på beläggningskvaliteten är avgörande för att säkerställa produktion .}
In the initial judgment, the appearance characteristics of CMC can be observed. High-quality coating-grade CMC usually appears as white or slightly yellow fibrous powder, with uniform color and no impurities. If the color is dark, there are obvious impurities, or the color is too bright and unnatural, it may indicate that there is a problem with its quality. At the same time, lukt sin lukt . normala produkter bör inte ha en skarp lukt . Om det finns en skarp eller konstig lukt, indikerar det att andra kemikalier kan blandas i .}
Solubility is an important indicator for identification. Take a small amount of sample and place it in clean water and stir it evenly. High-quality coating-grade CMC can dissolve quickly and evenly, and the solution is clear and transparent, with no obvious particles remaining. If it dissolves slowly, clumps, dissolves unevenly, or there are a large number of Olösta partiklar i lösningen betyder det att dess grad av polymerisation kanske inte uppfyller standarden eller dopas med andra ämnen .
Viscosity detection is also a key link. Take a certain amount of CMC solution and use a viscometer to measure its viscosity. Different types of coating-grade CMC have corresponding viscosity standard ranges. By comparing the measured value with the standard value, its quality can be preliminarily judged. If the viscosity value is too Högt eller för lågt, det kanske inte uppfyller kraven i beläggningsformeln .
In addition, professional chemical testing methods such as infrared spectroscopy analysis and thermogravimetric analysis can accurately determine the molecular structure and thermal properties of CMC, and further confirm its purity and quality grade. Through these scientific and comprehensive identification methods, high-quality coating-grade CMC can be effectively screened out, providing reliable guarantee for coating quality.
