Coating Composition Gloss Control via Silica Sol Ratio
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Solution Overview
Problem
Existing coating compositions for building walls struggle to consistently achieve desired gloss levels such as matt, medium gloss, and glossy, and often lack sufficient wet abrasion resistance, particularly in interior paints.
Innovation Solution
A coating composition comprising an organic binder, water glass, silica sol, finely divided fillers or pigments like titanium dioxide, and optional second pigments, with a specific particle size distribution and weight proportion, which allows for reproducible glossy and semi-gloss coatings with enhanced wet abrasion resistance, all without preservatives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional coating compositions are used, then various gloss levels can be targeted, but the gloss levels cannot be achieved reproducibly with consistent quality
Solution Approach 1:
The patent applies parameter changes by precisely controlling the particle size distribution of fillers (D10 ≤ 0.4 μm, D50 ≤ 0.6 μm, D90 ≤ 1.7 μm) and the ratio of silica sol to water glass (greater than 1:1 by dry weight). These parameter optimizations enable reproducible achievement of target gloss levels (matt, medium gloss, glossy) while maintaining consistent coating quality across different batches.
2Adaptability or versatility
If conventional coating compositions are used, then color design options are available, but wet abrasion resistance is insufficient
Solution Approach 1:
The patent employs composite materials by combining organic binder with inorganic components (water glass and silica sol) in a specific ratio, where the silica sol content exceeds water glass content by dry weight. This composite structure creates a cross-linked network that significantly enhances wet abrasion resistance while preserving color design versatility through compatible pigment integration.
3Stability of the object's composition
If preservatives are added to coating compositions, then storage stability is improved, but environmental friendliness and safety are reduced
Solution Approach 1:
The patent converts the typically harmful preservative function into a beneficial preservative-free system by utilizing the alkaline environment created by water glass (pH > 10) and the film-forming properties of silica sol. The inorganic binder system creates conditions that naturally inhibit microbial growth through high pH and reduced water availability in the dried film, eliminating the need for organic preservatives while maintaining 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 enables consistent achievement of desired gloss levels and improved wet abrasion resistance in coatings, classified as preservative-free and environmentally friendly, meeting high quality and performance standards.
Implementation Method 1
silica sol, with a particle size D 50... the dry weight proportion of silica sol being greater than the dry weight proportion of water glass
Implementation Method 2
water glass... the inorganic binder comprising water glass and silica sol
Implementation Method 3
at least one first filler and/or at least one first pigment, in particular titanium dioxide, with a particle size D 50... less than or equal to 2.0 μm
Implementation Method 4
first pigment, in particular titanium dioxide... desired gloss levels such as matt, medium gloss, also called semi-gloss, and glossy
Implementation Method 5
a) at least one organic binder... the organic binder and the inorganic binder
Data Source
AI summary
The present invention relates to a coating composition comprising or consisting of a) at least one organic binder, b) water glass, c) silica sol, d) at least one first filler and/or at least one first pigment with a particle size D50, determined according to DIN ISO 9276-1:2004-09 (Presentation of results of particle size analysis - Part 1: Graphical representation) and ISO 9276-2:2014-05 (Presentation of results of particle size analysis - Part 2: Calculation of mean particle sizes/diameters and moments from particle size distributions) less than or equal to 2.0 µm, preferably less than or equal to 1.0 µm and particularly preferably less than 0.8 µm, wherein the dry weight fraction of silica sol is greater than the dry weight fraction of water glass, in each case based on the total dry weight of the coating composition.Furthermore, the invention relates to a coating obtained or obtainable from the coating composition according to the invention. The invention also relates to the use of the coating composition according to the invention for the production of coated substrate surfaces, in particular building facades or interior walls.