Kit-of-parts tinting system for color stability
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Solution Overview
Problem
Kit-of-parts tinting systems used in point-of-sale applications often result in paints and plasters with unsatisfactory color stability when exposed to sunlight, particularly for dark-colored coatings, due to the challenges of mixing multiple pigments with a single base composition, leading to complaints about color defects.
Innovation Solution
A kit-of-parts tinting system comprising an aqueous coloring composition with pigments, HALS stabilizers, wetting agents, humectants, and UV absorbers, combined with a tinting base composition that includes a binder and liquid medium, optimized to provide improved color stability by adjusting pH and minimizing preservatives and VOC content, allowing for the production of stable tinted coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple color pastes are mixed with a single base compound in commercial tinting machines, then a wide variety of colors can be produced at point of sale, but color stability deteriorates after prolonged exposure to sunlight
Solution Approach 1:
The invention divides the tinting system into separate modules: color concentrates containing pigments and stabilizers are kept separate from the base compound until mixing. This segmentation allows each component to be optimized independently - color concentrates can contain high levels of HALS and UV absorbers without interfering with base compound formulation, and the base compound can be optimized for application properties. When mixed, they produce stable tinted coatings.
Solution Approach 2:
The invention applies preliminary action by pre-formulating color concentrates with optimal stabilizer concentrations (HALS and UV absorbers) before mixing with the base compound. This allows the stabilizers to be present from the beginning of the tinting process, protecting the pigments and base compound from UV degradation and oxidation during storage and application, rather than relying on stabilizers already present in the base compound alone.
2Adaptability or versatility
If pigments with low color intensity are used to achieve dark-colored coatings, then color diversity is increased, but color stability worsens due to insufficient pigment concentration
Solution Approach 1:
The invention creates a composite material system where color concentrates (containing pigments and stabilizers) are combined with base compound. This composite approach allows low color intensity pigments to be used effectively because the concentrated formulation ensures sufficient pigment loading in the final coating, while the embedded stabilizers protect these pigments from degradation, achieving both desired color depth and long-term stability.
3Reliability
If factory manufacturing is used to achieve optimized pigment and colorant formulation, then color stability is improved, but ease of operation worsens due to loss of point-of-sale customization
Solution Approach 1:
The invention enables parameter changes at point of sale by allowing customization of color concentrate selection and ratios. Different combinations of color concentrates can be mixed with the base compound to achieve various shades, all while maintaining factory-optimized stabilizer formulations. This provides both customization flexibility and 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 system ensures pronounced color stability for a wide range of color compositions, even in point-of-sale machines, by using a combination of HALS stabilizers and UV absorbers with pigments, particularly effective for color-weak pigments, and reducing the need for preservatives and VOCs, resulting in durable and consistent tinted coatings.
Implementation Method 1
at least one HALS stabilizer (Hindered Amine Light Stabilizer)
Implementation Method 2
at least one UV absorber
Implementation Method 3
at least one pigment
Data Source
AI summary
The present invention relates to a kit-of-parts tinting system for color adjustment of coating compounds, comprising A) at least one aqueous color composition containing a pigment, a HALS stabilizer, a wetting and/or dispersing agent, a humectant, and water, and B) a tinting base composition containing a binder and a liquid medium. The invention further relates to the use of the kit-of-parts tinting system for the production of tinted coating compounds, as well as a tinted paint system or tinted plaster system obtained from the kit-of-parts tinting system by mixing composition A) with a tinting base composition B). The invention also relates to a paint obtained by applying the tinted paint system, and a plaster obtained by applying the tinted plaster system to a substrate surface.Finally, the invention relates to a method for tinting an aqueous color composition, comprising mixing the color composition and the tinting base composition to obtain a tinted paint system or a tinted plaster system.