Lightweight Coating Composition with Expanded Fillers
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Solution Overview
Problem
Existing coating compositions for exterior wall painting are heavy, making them difficult to handle, and often contain high levels of volatile organic compounds (VOCs), which are harmful to painters and the environment. They also struggle to achieve a matte finish and adequate vapour permeability, leading to issues with paint durability and VOC compliance.
Innovation Solution
A water-based coating composition with a low density, achieved by combining a polymeric coating binder with expanded polymeric microspheres and expanded glass particles, which reduces weight and maintains paint performance while minimizing VOC content and achieving a matte or satin finish.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If traditional coating compositions are used, then adequate coating performance is achieved, but the density and weight are high, making them difficult to handle
Solution Approach 1:
The patent changes the density parameter of the coating composition by replacing traditional fillers with lightweight fillers having density less than 2.0 g/cm³, achieving a coating composition density between 1.0-1.3 g/cm³ while maintaining adequate coverage and performance
Solution Approach 2:
The patent uses composite fillers comprising multiple lightweight materials such as hollow glass microspheres, expanded perlite, and polymeric microspheres combined with pigments to achieve both low density and adequate coating performance
2Object-affected harmful factors
If traditional coating compositions are used, then sufficient coverage is achieved, but VOC content is high, which is harmful to painters and environment
Solution Approach 1:
The patent reduces VOC content by formulating a water-based coating composition with VOC content less than 50 g/l, while maintaining film formation through careful selection of binder and additive systems
Solution Approach 2:
The patent uses water as an intermediary solvent instead of organic solvents, and employs surfactants and dispersants as mediators to ensure proper wetting, dispersion, and film formation without relying on high VOC content
3Shape
If coating composition is made lightweight, then handling is improved, but achieving matte finish becomes difficult
Solution Approach 1:
The patent achieves matte finish by controlling the surface roughness parameter through filler particle size distribution and adding specific matting agents, while simultaneously maintaining low density through lightweight filler selection
Solution Approach 2:
The patent selects fillers that serve multiple functions: providing low density, enabling matte finish through light scattering, and maintaining coating stability, such as using hollow glass microspheres and expanded perlite
4Stability of the object's composition
If coating composition is made lightweight with expanded fillers, then density is reduced, but storage stability may be compromised
Solution Approach 1:
The patent uses dispersants and anti-settling agents as intermediaries to prevent aggregation and settling of lightweight expanded fillers during storage, ensuring composition stability while maintaining low density
Solution Approach 2:
The patent optimizes the particle size distribution and surface treatment of expanded fillers to prevent settling and aggregation, achieving both low density and long-term storage 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 composition provides a lightweight, stable, and VOC-reduced coating with improved handling and performance, maintaining paint properties and meeting VOC regulations, while allowing for water and vapour permeability to prevent damp issues.
Implementation Method 1
The use of expanded fillers, such as expanded glass particles and expanded polymeric microspheres, which have a low density and can trap air or gas within their structure
Implementation Method 2
expanded glass particles, preferably expanded silica glass particles; wherein said coating composition comprises at least 0.1% by weight and at most 25% by weight of said at least one first filler and at least one second filler combined, based on the total weight of the composition
Data Source
AI summary
The invention relates to a coating composition comprising:—a polymeric coating binder; wherein the polymeric coating binder has a glass temperature Tg of at least 0° C. and at most 30° C.;—at least one first filler, wherein the first filler comprises expanded polymeric microspheres; and, at least one second filler, wherein the second filler comprises expanded glass particles; wherein said coating composition comprises at least 0.1% by weight and at most 25% by weight of said at least one first filler and at least one second filler combined, based on the total weight of the composition. The invention also relates to the use of such a coating composition as an exterior wall masonry paint. The invention also relates a substrate having applied thereon such a coating composition.