Description and features
Vicura MC-55 (Pyrromelletic Acid Diphenyl Imidazoline Salt 1:2) is an off-white powder with the following chemical formula: C10H6O8.2C9H10N2
The curing mechanism between Vicura MC-55 (Pyrromelletic Acid Diphenyl Imidazoline Salt 1:2) and the epoxy resin is complex. Two parallel processes occur: the direct reaction between the imidazoline and the epoxy group, and the homopolymerization of the epoxy resin catalyzed by Vicura MC-55. Unlike most powder coating systems, where the optimal ratio between the crosslinker and the binder is close to the stoichiometric ratio, the optimal ratio for Vicura MC-55 is typically determined empirically. For epoxy resins commonly used in powder coatings (with epoxy equivalent weights between 700 and 1000), manufacturers recommend using 6.0 – 9.0% of Vicura MC-31 as a good starting point.
Benzene-1,2,4,5-tetracarboxylic acid, compound with 4,5-dihydro-2-phenyl-1H-imidazole (1:2) is also known as Pyromellitic acid di(2-phenyl-2-imidazoline) salt (1:2).
Availability
Europe: Vicura MC-55 is in stock in our local warehouses. Our lead time is about one week if delivered in 20 KG paper bags.
We can also serve Canada, South America, South Africa, and other markets. Please contact our sales department for more details.
This substance (CAS: 54553-91-2) has been registered under REACH (EC) 1907/2006.
Product Identification
| CAS number | 54553-91-2 |
| EC number | 259-226-5 |
| HS code | 2933 2990 |
Specification
| Appearance | White or yellow fine powder |
| Assay | ≥99 % |
| Melting range | 220 – 245 ºC |
Application
Vicura MC-55 (Pyromellitic Acid Diphenyl Imidazoline Salt) is an organic salt of polycarboxylic acid and cyclic amidine. It is primarily used as a crosslinker in the production of matt epoxy and polyester/epoxy hybrid powder coatings. As a versatile crosslinker, Vicura MC-55 can function as the sole crosslinker in formulating matt epoxy powder coatings, achieving a gloss level of 20-25 (Gardner 600). However, to increase the gloss level, manufacturers can partially replace Vicura MC-55 with the “high gloss crosslinker” Vicura MC-31. The optimal ratio between the two crosslinkers, though, should be determined experimentally for each formulation.
In polyester/epoxy powder coatings, manufacturers adjust the gloss level by replacing a portion of the polyester with Vicura MC-55, while also increasing the amount of epoxy resin. This approach allows for precise control over the final gloss and performance characteristics of the coating.The curing reaction between Vicura MC-55 and the epoxy groups starts at temperatures above 180 ºC. ͦ By increasing the temperature the curing cycles are getting quickly in the range typical for other thermosetting powder coatings.
Packaging
Available packaging: 20 KG paper bags.
Special packaging is available on request.
Storage
Store Pyrromelletic Acid Diphenyl Imidazoline Salt (1:2) cool, dry and well-ventilated area and in line with legal requirements.
MSDS
A Material Safety Data Sheet (MSDS) is available for Vicura MC-55 and all other products supplied by Vesta Chemicals BV.
An MSDS outlines the hazards of a product and explains how to handle, use, and store the product safely. Besides it provides important regulatory and emergency response information for the purchased product.
Molecular and structural information
| Molecular formula | C10H6O8.2C9H10N2 |
| Molecular weight | 546.54 g/mol |
| Smiles notation | |
| InChi key | XSMMIZPIWZYHNL-UHFFFAOYSA-N |
| Structural formula: |  |
Physicochemical information
| Boiling point | >201 ºC |
| Bulk density | 1.38 g/cm3 @ 20 ºC |
| Flash point | >250 ºC @ 1 atm |
| Melting point | ±240 ºC at ± 1 atm |
| Partition coefficient (log Pow) | 6.45 @ 25 ºC |
| Solubility in water | 6 g/l @ 20 ºC / pH 3.8 |
| Vapor pressure (MGM) | 0 Pa @ 25 ºC |