P – 511
SATURATED POLYESTER RESIN
General purpose coil coating and metal packaging coating. “Zero T” resin for coil coating application.
- Excellent flexibility
- Good light fastness
- Good exterior durability
- Excellent stain resistance
P-511 is linear oil free polyester developed for use in Coil Coating, sheet fed Metal Decorating and General Industrial applications.
P-511 is compatible with a wide range of melamine resins and is typically hexamethoxymethyl melamine and partially methylated melamine.
For an optimum performance with respect to level of cure, flexibility, hardness and impact resistance, a combination of P-511 with hexamethoxymethyl melamine resin at ratio of 70:30 to 85:15 on solid resin content is suggested.
To promote cure, the use of between 1% to 5% of acid catalyst is recommended, e.g. para toluene Sulphonic acid, calculated on melamine solids.
Variation in the levels of P-511 and the type of amino resin will modify the overall performance of the coating. Increasing the level of amino resin (and catalyst) will generally tend to increase the hardness and solvent resistance of the coating but may compromise flexibility.Coil Coating
Applications an 85:15 to 80:20 ratio, on solids, with hexamethoxymethyl melamine resin is recommended with 2% PTSA catalyst on amino level.Metal Decorating
On solids, of 72:18:10 OFPE: melamine: epoxy resin (epoxy equ »500) with 2% PTSA solids amino is suitable.
Part methylated amino resin can be used in place of hexamethoxymethyl melamine and will develop very good hardness & solvent resistance but at the expense of flexibility.General industrial enamels
Can be formulated with 70:30 to 80:20 ratios with hexamethoxymethyl melamine or part methylated melamine, with 2% PTSA catalyst.
Enamels based on P-511 exhibit good light fastness results after prolonged UV exposure and finishes are resistant to staining from a variety of household materials.Curing Schedules
For Coil Coating based on P-511 can be cured using a peak metal temperature of 232°C - 240°C.
For Metal Decorating, a cure schedule of 10 minutes at 160 - 200°C depending on requirements is recommended.
For General Industrial applications a baking schedule of 30 minutes at 150°C will be suitable.
|Solid at 120°C / 2Hr||65 ± 2%|
|Viscosity as such in Brook Filed RVT/S – 3, RPM – 25 at 25°C Temperature||25 – 35 Poise|
|Color on Gardener Scale||2 Max|
|Acid Value (mg KOH/gm)||10 Max|
|Hydroxyl Value (mg KOH/gm) on Solid||65 ± 5|
|Specific Gravity at 25°C||1.03 ± 0.02|
|Solvent||Aromatic Solvent 100|
|P-511||65 ± 2% in Aromatic Solvent|
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