The demand for long-lasting interior and exterior architectural coatings is increasing. These coatings must comply with certain regulations. Additionally, architectural coatings producers must provide a broad range of high-quality, eco-friendly options.
We have identified the seven biggest challenges for architectural coatings. And in this article, we will show you how to solve them.
Foam: Finding the right defoamer is about striking a balance between efficiency and compatibility The impacts of foam in an architectural coating formulation are extensive:
Disrupted production process and increased production time
- Less efficient milling process
- Longer filling times
Negatively affected paint transfer and disturbed application
- Longer application time
- Inhomogeneous surface appearance
Substantial quality loss and surface defects
- Reduction of gloss
- Craters or bubbles on the surface
- Loss of protection
The foam challenge can be mastered with defoamers, such as those offered by Evonik Coating Additives. Defoamers promote an efficient production process, provide reliable application, promote defect-free surfaces, maximize the protection of the substrate, and optimize aesthetics.
Burnish & Wet Abrasion: Resistance to burnishing is the coating’s ability to maintain its visual appearance after being rubbed by soft objects. Leather, sponges, wet rags, and human hands all impart mechanical stress on applied coatings. This makes burnishing and wet abrasion resistance two major formulation challenges. The existing filler options, however, leave formulators with limited support to overcome the challenges for differentiated products.
To overcome this challenge, products are needed that strengthen the coating film without increasing the viscosity of the coating compared to using the same amount of a standard calcium carbonate filler. This is exactly what companies like Evonik have developed with a new class of synthetic silica. This new class of fillers features a unique particle morphology, narrow particle size distribution, very low surface area, and porosity.
Perfect Colors: From light pastels to deep tones, the broad range of colors for architectural coatings leads to the challenges for the base paint.
- Good colorant acceptance even for difficult organic pigments
- Highest possible color strength
- Minimal influence on coating properties
To overcome these challenges, formulators can utilize various additives such as those offered by Evonik:
- Dynamic wetting agents to ensure quick pigment wetting
- Grind aids that offer a good balance of pigment wetting and stabilization
- Dispersants for effective stabilization of pigments and particles in aqueous systems
- Highly efficient compatibilizers
Long-Lasting Façade Coatings with Low Dirt Pick-Up: Consider a beautiful, freshly painted façade. Now consider that as soon as it is exposed to the elements (rain, moisture, mechanical stress), unsightly visible streaks appear and the façade absorbs dirt. Harsh environmental conditions degrade the polymers in exterior architectural coatings, causing erosion and chalking. Mold growth and dirt absorption negatively affect their appearance. In addition, water-soluble ingredients, which are essential for the production and handling of paint, cause snail trails.
To ensure that your façade remains beautiful, consider using water-repellents to reduce water absorption and minimize dirt pick-up. Our line of hydrophobing agents boasts protection from water and the elements, low capillary water absorption, a water-beading effect, low dirt pick-up, and increased drying speed.
In addition to hydrophobing agents, we also have the right solution for snail trails: a novel powder additive consisting of calcium silicate with a particularly porous structure. This product’s fine particles act like a sponge – absorbing and retaining water-soluble components, so that no material can wash out.
Brightest whites: Bright white and glossy – that’s how facades and interior wall paints are desired. In architectural coatings, titanium dioxide is a very popular mineral because of its strong opacifying properties. As demand for TiO2 increases, however, so does the price. In addition, TiO2 requires a labor-intensive process, and concerns about its environmental impact are growing. Therefore, it is time to reduce the required amount of TiO2.
Our portfolio of sodium aluminum-silicate TiO2 extenders solve this challenge. They are recommended as a partial replacement of TiO2 (thus reducing costs). They have better hiding power, higher spreading rate, high whiteness, and better storage stability. Aluminum-silicates also boast additional benefits, such as:
- Improved touch-up properties
- Better sheen control
- Higher tinting strength
- Improved anti-settling
Adhesion of trim paints on various substrates: Wood, steel, aluminum, plastic – trim paints must adhere to a variety of surfaces, and they must fulfill a wide range of requirements:
- Good adhesion on different substrates
- High mechanical resistance
- Good weather stability
- Good appearance over a broad range of gloss levels
- Good recoatability
- Anti-blocking properties
- High colorant acceptance for solventborne and waterborne base paints
Evonik offers two adhesion promoting co-binders for architectural coatings that enable adhesion on several substrates. (Co-binders are used as a partial replacement of the main binder.)
And depending on the specific co-binder used, the formulator can expect additional benefits:
- Improved hardness, gloss, and blocking resistance
- Excellent water resistance
- Increased drying speed
- Improved inter-coat adhesion
- Improved flexibility
Sustainability: The protection of our environment and climate are major global challenges of our time. For architectural coatings, this means:
- End products must comply with certain regulations
- The requirements for data and analytics are constantly increasing
- The Ecolabel has become a basic requirement in the industry
Maintaining the natural basis of life for future generations is part of the Evonik’s corporate responsibility. As a specialty chemicals company, we are aware that our production impacts the environment. That includes steadily reducing emissions and continuously improving the efficient use of materials and resources.
We meet this challenge with a systematic approach and support you with our profound knowledge of regulations and the support of our High Throughput Equipment (HTE) and our application technology laboratories across the globe. These eight sustainability aspects are of the highest relevance for us:
- Broad registration
- Safe use
- Labels / compliance
- VOC reduction
- Production efficiency
- Sustainable feedstock
- Enabler for recycling
Our High Throughput Equipment screens our own biobased additives and new materials from the market. We ensure that our products can be used in compliance with the current regulatory demands. And to support you, we have dedicated regulatory experts in every region across the globe. Master the sustainability challenge with us.
Today’s architectural coatings requirements are challenging, but you can master them all. Our broad portfolio always offers the right solutions to your specific challenges.