W´Kyd C 743 hs
W´Kyd C 743 hs is an extremely low viscous short oil and non-drying alkyd resin for the manufacture of high solids, oven cured primers, fillers and top coats.
Although W´Kyd C 743 hs is very low viscous, it is a high reactive stoving resin. Optimal film properties can be achieved at stoving conditions 10-30 min. at 160 - 130 °C, normally without addition of any catalyst. The alkyd-amino resin ratio by using high reactive methylated melamine resins (e.g. Cymel 325) is 80:20. An addition of catalyst is not necessary. By using butylated or iso-butylated melamine resin the optimum ratio is between 7:3 and 3:1. The addition of 0.4 - 1.0% of catalyst (e.g. W´Add 2030), calculated on total formulation is recommended.
Due to the high yellowing resistance of W´Kyd C 743 hs it is possible to cure at temperatures up to 160 °C by reducing the curing time.
High solids stoving paints based on W´Kyd C 743 hs in conjunction with methylated melamine resins such as Cymel 325 exhibit a high degree of gloss, good film build and mechanical properties. Due to the excellent adhesion W´Kyd C 743 hs can be used for one coat finishes.
In order to improve flow and gloss, the addition of 0.1 - 0.2% W´Add 100 is recommended. The addition of silicone based additives should be avoided because cratering can be the result.