Tinting Base Composition for UV-Reflective Facade Coatings
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Solution Overview
Problem
Existing tinted coatings for facade panels are susceptible to damage from electromagnetic radiation, leading to color changes and thermal bridges, and current solutions like UV protectants and NIR-reflecting pigments are expensive or limit color selection, while reducing pigment volume concentration requires high binder content, which is economically and safety-wise unfavorable.
Innovation Solution
A tinting base containing barium sulfate and/or calcium carbonate fillers with specific particle sizes and oil contents, combined with an organic polymer binder and wax, provides high reflectivity and low pigment volume concentration, ensuring minimal electromagnetic radiation absorption and improved color stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UV protectants are added to prevent damage from UV radiation, then color stability is improved, but cost increases and protective effect is lost over time
Solution Approach 1:
The patent replaces expensive UV protectants with barium sulfate filler particles that provide UV protection through their inherent reflective properties. These filler particles are cost-effective and maintain their protective function throughout the coating's service life without degrading over time.
Solution Approach 2:
The patent extracts the UV protection function from specialized UV protectant chemicals and integrates it into the basic filler material (barium sulfate) that is already present in the coating formulation. This eliminates the need for additional expensive UV protectant additives.
2Reliability
If NIR-reflecting color pigments are added to prevent damage from NIR radiation, then thermal damage is reduced, but cost increases and color selection is limited
Solution Approach 1:
The patent makes the barium sulfate filler serve multiple functions: it provides structural bulk, enables color depth through its reflective properties, and protects against both UV and NIR radiation. This single filler replaces the need for separate NIR-reflecting pigments, maintaining full color selection capabilities while adding thermal protection.
3Reliability
If pigment volume concentration is reduced to improve color stability, then electromagnetic radiation damage is minimized, but binder content must increase which is economically and fire safety-wise unfavorable
Solution Approach 1:
The patent changes the optical parameters of the filler particles by using barium sulfate with specific particle size distributions and surface treatments. This allows the filler to provide superior reflective properties and electromagnetic radiation protection at lower volume concentrations, reducing the need for increased binder content while maintaining color stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves minimal color deviation and improved gloss retention, even after prolonged exposure to sunlight, without the need for multiple coating layers and with reduced binder content, thus enhancing durability and cost-effectiveness.
Implementation Method 1
both fillers exhibit high reflective properties, which, particularly in the range of 350 nm to 2500 nm, result in minimal absorption of electromagnetic radiation, with almost all of it being reflected
Data Source
AI summary
The invention relates to a tinting base for a tinted coating composition, in particular for forming a tinted coating on a board material, comprising - at least one organic polymer binder with a glass transition temperature (TG) according to EN ISO 16805 > 45°C, preferably > 50°C, furthermore preferably > 55°C, - at least one filler made of barium sulfate and/or calcium carbonate, having (iii) an average particle size D50 of 1-20 µm, preferably of 1-15 µm, furthermore preferably of 2-10 µm, and (iv) an oil absorption according to DIN EN ISO 787-5 of 1-22 g/100 g, preferably of 2-18 g/100 g, furthermore preferably of 3-15 g/100 g, - at least one wax, - conventional additives and - water. The invention further relates to a tinted coating composition for forming a tinted coating on a panel material.