Weak-Acid Concrete Stain With Self-Neutralizing Color Chemistry
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Solution Overview
Problem
Existing methods for coloring concrete surfaces using acidic solutions are hazardous due to the use of corrosive chemicals, leading to temporary and prone-to-peeling results, with high labor and expense costs for cleanup and application.
Innovation Solution
A composition combining an acid with a weak base, such as hydrogen chloride and urea, which self-neutralizes during the staining process, eliminating the need for additional neutralization steps and reducing corrosive risks, while using water-soluble metallic salts to impart color to cementitious substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If highly corrosive acidic solutions are used to color concrete surfaces, then the coloring becomes permanent and durable, but the handling safety deteriorates and harmful factors increase
Solution Approach 1:
The patent introduces an intermediary substance (weak base) that mediates between the acid and the concrete surface. This weak base reacts with the acid to form a salt that serves as the actual staining agent, eliminating the need to handle concentrated corrosive acids while maintaining the permanent coloring effect through the same chemical reaction with calcium carbonate.
Solution Approach 2:
The patent changes the chemical parameters of the staining solution by using pre-formed salts instead of acidic solutions. This parameter change transforms the solution from highly corrosive (low pH) to non-corrosive (neutral or near-neutral pH), while the salt components maintain the ability to react with calcium carbonate and impart permanent color.
2Reliability
If traditional acid staining methods are used, then permanent coloring is achieved, but extensive cleanup and neutralization steps are required
Solution Approach 1:
The patent employs self-service through the self-neutralization property of the weak base components in the staining solution. The weak base automatically neutralizes any excess acid during the staining process, eliminating the need for separate neutralization steps and reducing cleanup time and complexity.
3Ease of manufacture
If corrosive acids are used for concrete staining, then effective coloring is achieved, but additional safety equipment and handling procedures are needed
Solution Approach 1:
The patent replaces expensive and complex safety equipment requirements with a simple, disposable-like approach by using pre-formulated non-corrosive staining solutions. These solutions achieve the same staining effectiveness without requiring specialized safety equipment, making the process as easy to implement as conventional painting or staining methods.
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 provides a safe, durable, and permanent coloring process for concrete surfaces, reducing the need for extensive cleanup and neutralization, and offering a range of color options with improved safety and reduced costs.
Implementation Method 1
the use of hydrochloric acid to decompose the calcium carbonate and calcium oxide in the concrete, and to facilitate the ion exchange with the metallic salt, which imparts the color to the surface of the material
Implementation Method 2
The calcium carbonate in the mixture is insoluble in water but reacts readily with most acids
Implementation Method 3
A second common method in the art of coloring concrete involves washing the concrete surface with an acidic solution to roughen or etch the surface; neutralize and rinse away the etching solution with a mixture of common baking soda and water
Data Source
AI summary
The present invention provides compositions and methods which are adapted to impart color to concrete or mineral substrate surfaces. Specifically, the present invention relates to a composition and methods adapted to treat concrete surfaces which have the advantage of using a non-corrosive acid-based solution.