Clear Coat Acrylic with Silicone-polyether block copolymer flow and leveling

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CoatOSil 7001 copolymer provides improved flow and leveling properties in the clearcoat formulations tested when compared to a commercially available flow and leveling additive and a control formulation with no additive. The flow and leveling improvements were quantified in the formula using an acrylic-polyol binder resin system. Application is not limited to this type of acrylic-polyol and may be considered for use in a wider formulation array of acrylic-polyol resins and blends.

Hydroxy functional polymers and amine functional polymers, compatible with main acrylic-polyol binders would also be excellent candidate resins to consider for formulations with specific performance requirements, along with flow and leveling properties provided by CoatOSil 7001 copolymer.

Grind Paste Preparation

1. Add Thermosetting Solution Acrylic Resin under agitation.
2. Slowly add fumed silica.
3. Cowles grind the n-Butyl Acetate was Cowles for 20 minutes.
4. Add 1.00 mm – 1.5 mm mill beads to the material blend. Grind for an additional 30 minutes.
5. Hegman grind gauge is required to indicate a grind of >6.0. If this has not been attained, additional grinding time may be required.
6. Add the remaining 75.0 gms of n-Butyl Acetate as a solvent flush to remove additional paste. (25.26% solids – theoretical) (Test for % solids). Store for use.

Coating Formulation – Under slow agitation, add all the components sequentially.

Performance

Clearcoat samples of this formulation were spray applied as a film gradient over black basecoated glass substrate to evaluate the coalescence, flow and leveling performance on very smooth surfaces. The three samples tested were 0.00%wt additive, 0.06%wt CoatOSil 7001 copolymer and 0.06%wt of a commercially available flow additive, based on a 100 gram total resin solids basis.

CoatOSil 7001 copolymer provided improved flow and leveling properties in the clearcoat formulations tested when compared to a commercially available flow and leveling additive and a
control formulation with no additive.

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