Urea-Acetic Acid Concrete Etching Composition
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Solution Overview
Problem
Current methods for etching concrete and mortar surfaces using hydrochloric acid are environmentally hazardous and pose health risks, lacking a safe and effective alternative.
Innovation Solution
An environmentally safe etching composition comprising an aqueous solution of urea, acetic acid, an anticorrosive agent, and a surfactant, which is applied to the surface and allowed to stand before being washed off, producing a desired grit finish without the harmful effects of hydrochloric acid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrochloric acid (muriatic acid) is used to etch concrete surfaces, then effective etching and cleaning of the surface is achieved, but environmental damage and health hazards occur due to toxic runoff and corrosive properties
Solution Approach 1:
The patent changes the chemical parameters of the etching solution by replacing hydrochloric acid with a combination of organic acids (acetic acid, formic acid, propionic acid) and urea. This substitution maintains the etching effectiveness while dramatically reducing the harmful environmental and health impacts associated with traditional muriatic acid
Solution Approach 2:
The patent converts the traditionally harmful strong mineral acids into beneficial organic acid systems that provide the necessary etching action without the severe environmental damage and health hazards. The organic acids and urea combination achieves the desired surface preparation while being environmentally safe and suitable for indoor use
2Productivity
If hydrochloric acid is used for etching, then the etching process is effective, but special safety equipment and hazardous material disposal procedures are required
Solution Approach 1:
The etching composition is formulated to be self-regulating and safe for use without specialized protective equipment. The organic acid system naturally provides adequate etching action while being safe enough for homeowners to use without acid-resistant gear, respirators, or hazardous waste disposal procedures
3Manufacturing precision
If high concentration of acetic acid is used in the etching composition, then coarser etching is achieved, but the formulation becomes more aggressive
Solution Approach 1:
The patent utilizes the concentration of acetic acid as a controllable parameter to achieve different surface finishes. By adjusting the acetic acid concentration, users can obtain varying degrees of etching from fine to coarse, all while maintaining safety due to the organic acid system's inherently lower aggressiveness compared to mineral acids
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 and effective etching process that minimizes environmental impact and health risks, producing a range of grit finishes on concrete and mortar surfaces without the need for hazardous chemical handling or disposal.
Implementation Method 1
an aqueous solution of urea, acetic acid, an anticorrosive agent, and a surfactant with no more than about 30% (w/v) urea and at least about 10% (v/v) acetic acid
Implementation Method 2
an aqueous solution of urea, acetic acid, an anticorrosive agent, and a surfactant with no more than about 30% (w/v) urea
Implementation Method 3
an aqueous solution of urea, acetic acid, an anticorrosive agent, and a surfactant
Implementation Method 4
an aqueous solution of urea, acetic acid, an anticorrosive agent, and a surfactant
Data Source
AI summary
Disclosed herein is an environmentally safe etching composition and method for a concrete or mortar surface. The composition includes, in some embodiments, an aqueous solution of urea, acetic acid, an anticorrosive agent, and a surfactant with no more than about 30% (w/v) urea and at least about 10% (v/v) acetic acid. The method includes, in some embodiments, obtaining the etching composition; applying the etching composition to the concrete or mortar surface at a prescribed ratio of the etching composition to the concrete or mortar surface; allowing the etching composition to stand on the concrete or mortar surface for a prescribed amount of time; and washing the concrete or mortar surface with water to produce an etched surface of the concrete or mortar.