Material Drying
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Volatilization and moisture absorption problems of liquid calcium-zinc stabilizers during storage and use
Problem Phenomenon
After opening, liquid calcium-zinc stabilizer stored for 2 weeks shows viscosity increase and stratified precipitation; during use, the metering accuracy decreases with batch-to-batch deviation of addition amount exceeding 5%, and the thermal stability of PVC products is sometimes good and sometimes bad.
Cause Analysis
The volatilization of solvent/diluent components in liquid calcium-zinc stabilizers causes concentration changes; environmental moisture is absorbed by the stabilizer, causing hydrolysis reactions, especially of the phosphite component; solid components in the liquid stabilizer precipitate out, causing uneven composition; storage temperature >35°C accelerates decomposition and volatilization; the container is not tightly sealed.
Solution
Store liquid calcium-zinc stabilizers in a cool, dry place at 15-25°C; after opening, keep sealed and use up within 1 month; fully stir or circulate before use each day to re-disperse the precipitate uniformly; install an online liquid metering pump to replace manual weighing, improving accuracy to ±1%; negotiate with the supplier to use small-size packaging (20 kg pack) to reduce the opening cycle.
Key Takeaway
The metering accuracy and use stability of liquid stabilizers need to be guaranteed through storage management and automated metering; this is the key to the industrial application of liquid-type stabilizers.
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