MEKO-end-capped PU Coating

1) Preparation of MEKO-end-capped PU prepolymer solution

Formulation:

Add ingredients a,b, c,d and e into a reactor fitted with a stirrer, heater, thermometer and gas inlet. Heat to 80~100 while stirring under nitrogen and keep for 3hr to allow max. PU prepolymer yield, that is NCO% reaches 8.9%. Add MEKO (ingredient f) into the solution and react at 60~80 for 3hr until NCO peaks disappear by IR detection. Thus MEKO end-capped PU prepolymer solution, with 60% of solid content, is obtained.

2) Preparation of the coating

Formulation:

Place the above ingredients in a mixer, and mix thoroughly to achieve a uniform suspension.

Characteristics and Use:

1. High adhesion, impact resistance and storage stability.

2. Suitable for galvanized steel surface, automotive, etc.

3. Recommended to apply by air spray; bake at 120 for 15min; film thickness 20μm. It can also be applied by brush, roller, blade and E-coating.