Fly Ash-Free Hydrophobic Coating for Consistent Tile Backerboard
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Solution Overview
Problem
Existing hydrophobic coatings for cementitious products, such as mat-faced boards, often require continuous mixing due to the presence of fly ash, leading to high maintenance, long delay times, and inconsistent results.
Innovation Solution
A fly ash-free, non-setting hydrophobic finish comprising a non-setting inorganic filler with a mean particle diameter of 12 to 35 microns and an aqueous dispersion of film-forming polymer, applied in batches to improve consistency and reduce maintenance and delay times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fly ash is used in the hydrophobic coating formulation, then bonding of finish materials is promoted, but continuous mixing is required leading to high maintenance and delay times
Solution Approach 1:
The invention extracts and removes fly ash from the coating formulation, replacing it with non-setting inorganic fillers. This eliminates the need for continuous mixing while maintaining coating performance, thereby resolving the contradiction between bonding strength and production time efficiency
2Strength
If fly ash is used in the hydrophobic coating formulation, then bonding of finish materials is promoted, but maintenance time increases
Solution Approach 1:
By removing fly ash from the formulation and substituting it with non-setting inorganic fillers combined with film-forming polymers, the invention eliminates the requirement for continuous mixing operations, thereby reducing maintenance time while preserving bonding effectiveness
3Reliability
If fly ash is used in the hydrophobic coating formulation, then water resistance is achieved, but consistency decreases due to setting requirements
Solution Approach 1:
The invention changes the fundamental parameter of the coating system from setting-based (fly ash) to non-setting (inorganic fillers with film-forming polymers). This parameter change enables batch production with consistent results while maintaining water resistance properties
4Strength
If continuous mixing is used for fly ash-based coating, then bonding is maintained, but productivity decreases
Solution Approach 1:
The invention removes fly ash from the system, eliminating the continuous mixing requirement. This enables batch production methods that significantly improve productivity while maintaining bonding strength through the use of non-setting inorganic fillers and film-forming polymers
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 allows for consistent batch production of hydrophobic coatings that do not set, reducing maintenance and delay times while enhancing water resistance in cementitious products like mat-faced boards.
Implementation Method 1
an aqueous dispersion of film-forming polymer
Implementation Method 2
hydrophobic finish
Data Source
AI summary
Mat-faced cementitious board including: (a) a cementitious core; (b) a fibrous mat having an inner first surface facing at least one face of the cementitious core, and an outer second surface, wherein the inner first surface and the outer second surface are opposed; (c) a hydrophobic, non-setting coating resulting from applying to the outer second surface of the fibrous mat a layer of hydrophobic finish composition including: (i) about 50 to about 80 weight % non-setting, inorganic filler having a mean particle diameter of about 12 microns to about 35 microns, (ii) about 20% to about 50 weight % an aqueous dispersion of a film-forming polymer, (iii) 0% to about 30 weight % additional water; (iv) an absence of fly ash, (v) an absence of pozzolanic material, (vi) an absence of hydraulic cement, (vii) an absence of calcium sulfate hemihydrate, and (viii) an absence of calcium sulfate anhydrite.