Description: Matt Hardener SL628 is made for outdoor powder coatings. It has good weather durability, and can be applied in TGIC/polymer system or other similar curing systems. Coatings formulated with SL628 can produce a gloss range from 8% to 40% @ 60 angle with good flow. Technical data: Use level | 90-110 PHR (based on unreacted epoxy compound) | Appearance | Pale yellow powder | Curing condition | 190¡æ/15min; 200¡æ/12min |
Application: In the formulation, the ratio of TGIC to polyester should be unbalanced to provide excess TGIC for reaction with SL628. Polyester to react with TGIC may be divided into 3 ratios/type viz. 96:4 (AV: 20), 93/7 (AV: 35) and 90/10 (AV: 50). In low gloss coating based on SL628, we recommend either the 96/4 or 93/7 ratio. The dosage of SL628 in the range of 90-110 PHR is based on the excess TGIC. Benzoin or hydrogenated caster oil could be used to degas the film and improve the flow. Suggested formulations: DSM P5201 | 50.2wt% | TGIC | 7.7wt% | SL628 | 3.8wt% | R902 | 20.6wt% | BaSO4 | 19.1wt% | GLP588 | 0.9wt% | Benzoin | 0.2wt% | HCO | 0.2wt% |
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