I've been using the standart AATM 109-01 (2006) procedure to determine the acid values of unsaturated polyesters. In this procedure solutions of Phenolphthalein and Potassium Hydroxide in etanol are used. Although in a recent experiment i got a polyester that does not dissolve in Ethanol (but it is soluble in Cloroform) so i don't think the Acid Values are right. Are there other solvents for the solutions or other procedure that can be used?
Thanks in advance,
João Pereira
Dear João P. M. Pereira, in the following free access documents, acetone and other solvents are used. My Regards
https://www.azom.com/amp/article.aspx?ArticleID=15566
https://patents.google.com/patent/CN102495059A/en
Dear João P. M. Pereira, in the following free access documents, acetone and other solvents are used. My Regards
https://www.azom.com/amp/article.aspx?ArticleID=15566
https://patents.google.com/patent/CN102495059A/en
Hi;
As proposed by Abdelkader BOUAZIZ, acetone is a good solvent for unsaturated polyesters. Please consult the attached document.
With my best regards
Approximately 5 grams sample of UPR is weighed and kept on the rack. 60 mL of solvent mixture is added to the sample by automated program. The mixture is allowed to react for 20 minutes, after which 15 mL of acetone is added using automation. The titration is then carried out using KOH with 1.0 mol/L concentration. The process is continued until after the equivalence point is reached.
The method comprises the following steps of: dissolving a certain quantity of polyester resin in a solvent; by taking phenolphthalein as an indicator, titrating with a potassium hydroxide-ethanol standard solution until the solution turns red; and calculating the acid value according to the consumption of the titrating ... https://www.google.com/patents/CN102495059A?cl=en
Kindly check http://www.european-coatings.com/Forum/Testing-measuring/HOW-TO-MEASURE-DETERMINE-ACID-VALUE-OF-UNSATURATED-POLYESTER-RESIN-COMPLETE-DETAILS
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