Wood & Furniture Coatings
BYK-1788, BYK-1790, and BYK-088 are defoamers which are perfectly suited to the needs of solvent-free radiation-curing high gloss clear coat systems. They provide excellent defoaming without any negative impact on transparency or any formation of craters. The recommended additive dosage is 0.1-0.4% as delivered on total formulation.
DISPERBYK-2155 is a solvent-free wetting and dispersing additive with a unique hyper-branched structure. It offers a broad compatibility with various grinding resins and letdown systems as 2-pack polyurethane, NC and alkyd without any influence on pot-life or drying. DISPERBYK-2155 provides excellent viscosity reduction and superb deflocculation and stabilization of inorganic and organic pigments.
There are different silicone-free surface additives based upon polyacrylate chemistry available which are designed to improve the leveling and eliminate orange peel effect in solvent-borne 2-pack polyurethane and NC systems. The first recommendations are BYK-358N or BYK-361N at an additive dosage of 0.1-0.5% as delivered on total formulation.
BYK-025 is a pretty compatible but nevertheless effective defoamer for water-borne wood coatings which are applied via curtain coater. In general, the best defoaming properties are achieved at dosages of 0.3-1.0% as delivered on total formulation without any negative impact on curtain stability. If, however, improved curtain stability is requested, BYK-307 is highly recommended. This solvent-free surface additive improves curtain stability significantly and can be also post-added during the application process.
DISPERBYK-2015 is a broadly applicable VOC-free wetting and dispersing additive for water-borne pigment concetrates and coating systems. It achieves superb stabilization of inoranic and organic pigments, provides strong improvement of color development, improves transparency and gloss, and offers excellent color stability.
OPTIFLO-H 3300 VF and OPTIFLO-M 2600 VF are associative mid-shear thickeners which are highly recommended to adjust the in-can viscosity and the "body" of clear and pigmented water-borne wood coatings. These rheology modifiers work pH independant and do not have any negative impact on gloss or transparency of the final coating system. Recommended usage levels are 0.3-2.0% as delivered on total formulation.
The anti-blocking properties of water-borne coatings can be significantly improved by using AQUACER 539 at dosage level of 1.5-2.0% solid on total formulation. Due to its very small and narrow particle size distribution AQUACER 539 does not affect the transparency or the gloss of high gloss water-borne clear coat systems.
LAPONITE-S 482 and LAPONITE-RD are synthetic clay based rheology modifiers for water-borne systems. These products achieve a very strong network formation once swelled and delaminated in the water-borne coating and, thus, create excellent anti-settling properties and improved storage stability. Additionally, LAPONITE-S 482 and LAPONITE-RD show strong synergistic effects with organic thickener types.
We recommend the usage of a wetting and dispersing additive to disperse the silica based matting agents in your solvent-free radiation-curing coating. DISPERBYK-2158 and DISPERBYK-2008 are specially designed wetting and dispersing additives for this particular purpose. They provide tremendous viscosity reduction with Newtonian flow behaviour even at higher matting agent loadings, achieve homogeneous distribution of the matting agents within the coating and improve the leveling and the surface smoothness of the coatings when applied by roller coater. DISPERBYK-2158 and DISPERBYK-2008 are suggested to be used at additive levels of 2.5-10.0% solid on matting agent for both treated and untreated silica based matting agents.
Associative high-shear thickeners are used to achieve Newtonian flow properties in water-borne coatings. As a result, improved application viscosity is achieved and enhanced leveling can be obtained. First recommendations to adjust the high shear properties of water-borne wood coatings are OPTIFLO-L 1400 and OPTIFLO-T 1000 at usage levels of 0.3-2.0% as delivered on total formulation.
Anti-settling or anti-sagging properties for matt or pigmented water-borne wood coatings can be achieved by applying associative low-shear thickeners. These products generate pseudoplastic flow properties and, thus, help to keep the matting agents or pigments suspended in the liquid media. First recommendations for water-borne wood coatings are OPTIFLO-H 6500 VF, OPTIFLO-H 7500 VF, and OPTIFLO-H 7625 VF which are usually applied at levels of 0.5-1.8% as delivered on total formulation.
DISPERBYK-2013 and DISPERBYK-2155 are solvent-free wetting and dispersing additives which provide excellent viscosity reduction, long-lasting storage stability of the pigment dispersions, improved color strength, transparency, and gloss. Their broad compatibility makes either product applicable to a variaty of different commonly used oligomers and monomers. The recommended additive dosage for inorganic pigments is 2.5-8.0% solid on pigment and for organic pigments and carbon blacks 15.0-60.0% solid on pigment.
DISPERBYK-2012 as well as DISPERBYK-2013 have shown superior performance in dispersing untreated and treated silica based matting agents for water-borne systems compared to other conventional wetting and dispersing additives. We recommend to apply an additive dosage of 5.0-10.0% solid on matting agent.
Due to environmental aspects many fluorine-containing products are withdrawn from the market and legislation restricts their use. It is common practice to use additive combinations to achieve substrate wetting and leveling performance at the same time. BYK-3455, however, combines excellent substrate wetting with good flow and leveling properties in one stand-alone product. In our application tests, we have observed improved flow into wood pores, reduced picture framing, and elimination of fish eyes.
I have evaluated many different commercially available wetting and dispersing additives to disperse titanium dioxides and to develop white pigmented water-borne furniture coatings but I always face severe issues with resistance Conventional wetting and dispersing additives are known to have negative impact on stain resistance so that DISPERBYK-2080 and DISPERBYK-2081 have been developed. These wetting and dispersing additives provide excellent dispersion of titanium dioxides, inorganic and some organic pigments along with strong viscosity reduction, high gloss, and excellent opacity without any negative impact on stain resistance of the final pigmented coating formulation. We recommend to apply DISPERBYK-2080 and DISPERBYK-2081 at a dosage of 1.5-2.5% solid on titanium dioxides and 4.0-7.0% solid on other inorganic pigments.for coffee, red wine, or tea stains. Do you have any suggestion?
BYK-3760 is a solvent-free surface additive based upon a polyether-modified polydimethylsiloxane. Due to its delivery form and tailored compatibility BYK-3760 can be used for solvent-borne, water-borne, and even radiation-curing wood coatings and achieves excellent surface slip properties at even low dosage of 0.05-0.2% as delivered on total formulation.
CERAFLOUR 1000 is perfectly suited for your request. This wax additive provides excellent matting properties combined with high transparency and smooth surface touch. Even when utilizing higher levels of CERAFLOUR 1000, the coating viscosity is stable and Newtonian flow properties are observed. CERAFLOUR 1000 is a micronized wax additive based upon a biodegradable polymer and does not cause any foam stabilization in radiation-curable coatings.
DISPERBYK-111 is a solvent-free wetting and dispersing additive which is perfectly tailored to disperse titanium doxides. Excellent viscosity reduction, highest gloss and opacity, and long-lasting storage stability can be achieved at an additive dosage of 1.5-3.5% solid on pigment. Its delivery form and chemical product composition make DISPERBYK-111 perfectly suited for solvent-free radiation-curing systems.
BYK-093 is a versatile defoamer with excellent long-lasting efficiency at high and low storage temperature. This defoamer is environmentally friendly and provides a broad application profile. Compatibility (less defects such as craters or turbidity), easy incorporation, and applicability as post addition complete its profile.
There are different micronized wax additives available to achieve surface finishes from very fine texture (CERAFLOUR 913, and CERAFLOUR 914) to medium texture (CERAFLOUR 915) or even coarse texture effects (CERAFLOUR 916). Due to the delivery form as micronized powders, these wax additives can be applied to both, solvent-borne and water-borne systems.
The right wetting and dispersing additive choice for cationic resin systems is challenging since conventional products show usually compatibility and stability issues with this kind of resins. However, DISPERBYK-2012 is perfectly tailored to the needs of water-borne cationic resins. The recommended dosage levels are 0.5-1.0% solid on fillers and 1.5-2.5% solid on titanium dioxides.
BYK-320 and BYK-323 are less active silicone surface additives which equilibrate the surface tension differences within the coating during solvent evaporation and, thus, improve significantly the matting agent orientation without showing any tendency to stabilize foam. Recommended dosage is 0.2 - 0.5% on total formulation.
CERAFLOUR 927 and CERAFLOUR 929 (0.5% -2.0% on total formulation) are recommended to achieve significantly better Taber abrasion performance without any influence on surface slip. CERAFLOUR 927 is a micronized, modified polyethylene wax which is the first recommendation for VOC-free water-borne systems whereas CERAFLOUR 929 is a micronized wax alloy which is providing the best performance in co-solvent containing water-borne systems at co-solvent levels from 2-5% on total formulation.
BYK-1781 (0.3-1.0% as delivered on total formulation) is recommended for a broad range of water-borne systems which are applied via airless or airmix spray application. This defoamer shows excellent efficiency for clear, matt, and pigmented water-borne wood coatings without negative impact on the crater formation, transparency in clearcoat systems or matting agent orientation in matt systems.
We obtain excellent results in acid-catalyzed wood finishes with the following additive 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 (0.1-0.3% as delivered on total formulation).
BYK-UV 3535 (100% active substance) is especially designed to improve the leveling in solvent-free radiation-curing systems. The product is highly compatible and does not cause any haze in the final coating system. Due to the multiple acrylic functionality BYK-UV 3535 reacts with the radiation-curing system which leads to a long-lasting effect without any migration. Recommended additive dosage is 0.1-0.3% additive (as supplied) based upon total formulation (in exceptional cases up to 0.5 %).
Due to the versatility of our micronized wax additives the recommendation would be to use either CERAFLOUR 1000 or CERAFLOUR 994. CERAFLOUR 1000 is a micronized wax additive based upon a biodegradable polymer and, thus, fulfills the additional need for renewability. CERAFLOUR 994 is a micronized additive based on an amide wax which helps to achieve this haptic appearance. In water-borne respectively solvent-borne systems the dosage should be around 2% on total formulation. For solvent-borne radiation-curing sytems the dosage should be around 5% on total formulation due to less and/or no shrinkage of the system to get the satisfactory effect.