Graffiti Removal Gel: Solvent Viscosity Control
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Solution Overview
Problem
Current methods for removing graffiti from surfaces are often inefficient, require significant resources, and generate hazardous waste, particularly due to the use of toxic solvents and high-pressure techniques, which pose challenges in terms of operator safety and environmental impact.
Innovation Solution
A suctionable gel comprising a mixture of ethyl acetate and diethyl malonate or ethyl acetate and methyl acetoacetate, combined with an inorganic viscosity agent like alumina, which is applied to the graffiti, dries to form easily removable flakes, allowing for effective graffiti removal without damaging the underlying surface and minimizing waste generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-pressure water spraying or sandblasting is used to remove graffiti, then graffiti removal effectiveness is improved, but operator safety deteriorates and equipment complexity increases
Solution Approach 1:
The patent replaces mechanical removal methods (high-pressure water spraying, sandblasting) with a chemical gel composition that dissolves graffiti through solvents. The gel contains organic solvents like ethyl acetate, isopropanol, and butyl acetate that chemically break down graffiti materials, eliminating the need for dangerous high-pressure equipment and improving operator safety while maintaining removal effectiveness.
Solution Approach 2:
The patent changes the physical state of the cleaning agent from liquid spray to gel form by incorporating gelling agents (silica, bentonite, cellulose derivatives). This gel formulation allows the solvent to remain in contact with graffiti longer, improving dissolution effectiveness without requiring high-pressure application, thus reducing harmful factors associated with pressurized systems.
2Reliability
If toxic solvents are used to dissolve graffiti, then graffiti removal effectiveness is improved, but environmental impact worsens
Solution Approach 1:
The patent selects solvents with specific properties: moderate volatility, low toxicity, and high graffiti dissolution capability. The chosen solvents (ethyl acetate, isopropanol, butyl acetate) are less harmful to the environment compared to traditional strong solvents, while still maintaining effective graffiti removal through their ability to dissolve various paint and marker materials.
Solution Approach 2:
The patent creates a composite gel system combining multiple solvents with complementary properties, gelling agents for retention, and surfactants for enhanced penetration. This composite formulation achieves superior graffiti removal effectiveness while using environmentally friendlier individual components, reducing overall environmental impact compared to single strong solvent systems.
3Reliability
If gel is applied to porous surfaces to remove graffiti, then graffiti removal effectiveness is improved, but risk of surface damage worsens
Solution Approach 1:
The patent adjusts the viscosity and penetration parameters of the gel formulation to control its interaction with porous surfaces. The gel contains solvents at controlled concentrations that are strong enough to dissolve graffiti but mild enough when applied as a gel (rather than concentrated liquid) to avoid excessive penetration and damage to porous substrates like stone, brick, and concrete.
Solution Approach 2:
The gel acts as an intermediary medium between the solvent and the porous surface. The gelling agents (silica, bentonite, cellulose derivatives) create a matrix that controls solvent release and penetration depth, allowing the solvent to dissolve graffiti on the surface while preventing excessive infiltration that could damage the underlying porous material structure.
4Ease of operation
If conventional liquid cleaners are used, then ease of application is improved, but waste generation worsens
Solution Approach 1:
The patent uses a gel formulation that forms a semi-solid film on the surface, allowing controlled application and minimal runoff. The gel structure (using gelling agents like silica, bentonite, or cellulose derivatives) enables the cleaner to stay in place on vertical and horizontal surfaces without requiring excessive amounts, reducing waste compared to liquid cleaners that run off or require frequent reapplication.
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 gel provides a safe, efficient, and cost-effective method for removing graffiti from various surfaces, including porous and non-porous materials, with minimal environmental impact and reduced operator exposure to hazardous substances, as it forms dry, easily vacuumable residues.
Implementation Method 1
a colloidal solution comprising, preferably, of: 0.1% to 30% by mass, preferably 0.1% to 25% by mass, preferably still 5% to 25% by mass, better 8% to 20% by mass, for example 10% by mass relative to the total mass of the gel, of at least one inorganic thickening agent
Implementation Method 2
70% to 99.9% by mass, preferably 75% to 99.9% by mass, preferably still 75% to 95% by mass, for example 90% by mass, of a mixture of ethyl acetate and diethyl malonate or of a mixture of ethyl acetate and methyl acetoacetate
Implementation Method 3
which is applied to the graffiti, dries to form easily removable flakes
Data Source
Figure 1~2
Figure 3~5B
Figure 6A~8B
AI summary
The invention relates to a gel for removing graffiti from a surface of a solid substrate, consisting of a colloidal solution comprising an inorganic viscosifier, at least one solvent, optionally at least one surfactant agent, and optionally at least one dye and/or pigment. The invention also relates to a method for removing graffiti from a surface of a solid substrate, wherein the gel is applied to said surface.