Starch Solution Paint Removal on Fragile Sandstone
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Solution Overview
Problem
Current methods for removing paint and other unwanted solid films from porous and mineralogically fragile surfaces, such as sandstone, often damage the substrate, require significant manual effort, or use toxic chemicals, and are ineffective in removing films that have penetrated into the surface.
Innovation Solution
A cooked aqueous starch solution with a concentration of starch between 3 wt% and 13 wt%, applied at temperatures between room temperature and 80°C, is used to effectively remove paint and other unwanted films without damaging the substrate, using minimal manual effort and avoiding toxic chemicals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If abrasives are used to mechanically blast or scrape the film away from the surface, then the solid film can be removed, but the porous or mineralogically fragile substrate is damaged
Solution Approach 1:
The patent replaces mechanical abrasion systems with a chemical solution-based system. The starch solution chemically interacts with the paint film to facilitate its removal without mechanical contact, thereby eliminating the damage caused by abrasive blasting or scraping while maintaining effective paint removal.
Solution Approach 2:
The starch solution acts as an intermediary substance between the paint film and the substrate. It penetrates the paint layer and facilitates its removal through chemical action, serving as a mediating agent that enables paint removal without direct mechanical or harmful chemical contact with the fragile substrate.
2Productivity
If conventional removal methods are used, then paint can be removed from the surface, but portions of the unwanted substance that have seeped into pores or penetrated below the immediate surface cannot be effectively removed
Solution Approach 1:
The patent utilizes the porous nature of the starch solution to penetrate into the pores and below the immediate surface of the substrate. The solution's ability to flow into and saturate the porous structure allows it to reach and remove paint portions that have seeped into the substrate, achieving complete removal rather than just surface-level removal.
3Productivity
If other removal methods are used, then solid film layers can be removed, but they either leave an undesired film or coating on the substrate that must be removed or remediated by other means, or require significant manual effort
Solution Approach 1:
The starch solution performs the paint removal function autonomously through its chemical properties. When applied, it automatically penetrates and lifts the paint film without requiring manual agitation, brushing, scraping, or scrubbing. The solution itself does the work of removing the film, eliminating the need for significant manual effort while avoiding the problem of leaving unwanted residues.
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 starch solution successfully lifts and removes paint from various substrates, including sandstone, with high effectiveness, leaving the substrate intact and without leaving additional unwanted films or coatings.
Implementation Method 1
cooking the aqueous solution at a temperature of above about 75° C. until gelatinized
Data Source
AI summary
Compositions and methods of the invention are directed to the removal of solid films, and particularly paint layers, from substrates, and particularly smooth, porous, and/or mineralogically fragile substrates such as sandstone. The compositions include cooked aqueous solutions of starch. The compositions can advantageously remove paints and other unwanted solid films from these and other substrates without damaging the substrate itself.