I have already prepared acrylic emulsion, but cannot find the way to add preservatives.
A lot of preservatives are not thermally stable, therefore I would recommend post-addition.
Best practice would be following technical data sheet or manufacturer instructions
Before polymerization: Adding preservatives during the polymerization process can help prevent microbial growth and contamination.
After getting a stable emulsion: Adding preservatives to the final emulsion product can help extend its shelf life and prevent spoilage.
Using a combination of both: Adding preservatives during polymerization and also to the final emulsion product can provide optimal protection against microbial growth and contamination.
It's important to note that the specific method of adding preservatives may vary depending on the type of acrylic emulsion and the desired application. It's recommended to consult the manufacturer's instructions or seek guidance from a qualified professional to ensure the proper addition of preservatives.
Reference
https://patents.google.com/patent/US3985698A/en
Dear all, preservatives have an antioxidant activity, they may interfere with the radical type polymerization even at low temperature. So post-polymerization addition of the preservative seems to be the adequate choice. My Regards
To Dr. Bouaziz's excellent point and assuming oil-water emulson, addition to finshed product is best but brings the challenge of mixing / distribution through the batch. For some that are added in reletively small volumes (e.g. CMIT), it can be very challenging. That does leave the process unprotected - so temeprature and time musf be controlled.
For water-in-oil, ithe preservative should be added upfront.
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