Wood & Furniture Coatings
To achieve improved sandability in your acid catalyzed system, I would recommend our micronized amide product CERAFLOUR 994. Dosage should be between 0.5 up to 2 on total formulation.
We obtain excellent results in acid catalyzed wood finishes with the following combinations: For defoaming action, we use BYK-065. Dosage should be around 0.5 and can be increased up to 1.0, if necessary. To avoid air draft sensitivity, we propose our BYK-330 (around 0.1 on total). To obtain good leveling and orientation of some matting agents, we use BYK-378 at a dosage of 0.05 on total formulation.
To achieve a pseudoplastic rheology effect in solvent-based systems, we can offer you two products: BYK-430 and/or BYK-431. The effect is always solvent-dependent (works quite well with MPA, diacetonealcohol). To control whether this works in your system, I recommend the incorporation of 4 on total formulation. If this is successful, then you can figure out the real demand of your system in detail. For BYK-430, we recommend the addition of 0.1-1.5 on total formulation for anti-settling and 1.0-3.0 on total formulation for anti-sagging. For BYK-431, we recommend the addition of 0.1-2.0 on total formulation for anti-settling and 1.0-4.0 on total formulation for anti-sagging.
Technical Service Support
There are different ways, to reduce penetration of the stain into the wooden substrate: usage of 15-20% of an acryilic or PU binder in the stain, usage of 2-3%cosolvenst which are partially mixable with water, e.G Dowanol DPM, DPnB.A quicker drying time (if possible), using 5-10% of ethanol or IPA is also possible.The binder should be compatible with the alcohol.
We have had good experience with BYK-P104 for fillers. We suggest you try approx. 2% calculated on filler.
All anti-settling additives influence flow and leveling to a greater or lesser extent. BYK-P 104(1-2%) is a wetting and dispersing additive which also shows anti-sedimentation properties. BYK-410 or BYK-420 rheological additives with very good anti-settling properties already at low dosages: 0,1-0,2%. For testing, you can stir BYK-410 or BYK-420 into the final paint. To have less influence on rheology/levelling, it is better to use BYK-410 or BYK-420 during the grinding process.
We recommend the following defoamers, in function of the PVC; 0-20% PVC: BYK-024 or BYK-028, 0,3-0,8%; 20-40%PVC: BYK-022 (0,3%)+ BYK-024 (0,2-0,5%). This additive combination is mostly recommended for high viscose lacquer. For lower viscosity 0,5-0,8% BYK-028 is recommended. If lower shear force, the stronger defoamer: BYK-022 (0,3%); BYK-024 should be added at the beginning to the formulation.Longer stirring time helps againts crater, too.
Technical Service Support
Our recommendation for your system is CERAFLOUR 1000. This product provides excellent matting properties combined with high transparency and additionally nice haptic. Even with higher dosages of CERAFLOUR 1000 the viscosity is quite stable and a newtonian flow behavior is observed.We applied a solventfree UV system containing up to 15% CERAFLOUR 1000 by using a curtain coater without problems regarding curtain stability. The product does not cause foam stabilization. CERAFLOUR 1000 is based on biodegradable polymer based on renewable resources with wax-like properties.
Due to environmental aspects a lot of fluorine containing products are withdrawn from the market and legislation restricts their use. To achieve substrate wetting and leveling performance at the same time additive combinations are common practice. BYK-3455 is a newly developed additive that combines excellent substrate wetting with good flow and leveling properties. In our tests we observed improved flow into wood pores, reduced picture framing and elimination of fish eyes.
With BYK-093 we developed a versatile defoamer with excellent long-lasting efficiency at high and low storage temperature. BYK-093 is environmentally friendy and provides a broad application profile. Compatibility (less defects such as craters and turbidity), easy incorporation, and suitability for post addition complete the profile.
For such fast drying systems it is very important to avoid foam stabilization. BYK-378 is highly efficient and provides increased slip in very low dosage. Only 0.05% of BYK-378 leads to very good orientation of silica matting agents without causing foam problems. From case to case a defoamer for example 0.1% - 0.3% BYK-141 can be used in combination.
DISPERBYK-2155 is a solvent-free wetting and dispersing additive with a unique hyperbranched structure. It has a broad compatibility with various grinding resins and let down systems as 2K, NC and AC without influence on potlife. It shows excellent viscosity reduction, deflocculation and stabilization of inorganic and organic pigments.
CERAFLOUR 929 is a micronized wax alloy which improves mechanical properties. Using dosages of 0.5 - 2% we achieve significantly better Taber abrasion test results without influence on surface slip.