Material Drying
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PVA hydrolysis aging
Problembeschreibung
PVA product in hot and humid environment, mechanical properties decrease >25%
Ursachenanalyse
PVA contains polar groups that hydrolyze and break chains under hot and humid conditions; ester bonds/amide bonds etc. are water-sensitive
Lösung
1) Select grade with low polar group content to reduce hydrolysis tendency; 2) Add anti-hydrolysis stabilizer; 3) Coat product surface with a waterproof layer
Wichtigste Erkenntnis
Hydrolysis aging is caused by polar groups being water-sensitive; selecting a low-polarity grade is the key
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