Descaling Formulation Preventing Ceramic Residues
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Solution Overview
Problem
Current descaling products for WCs based on hydrochloric acid often leave persistent colored residues on ceramic surfaces due to viscosifying agents like ethoxylated fatty amines, which yellow under extreme pH conditions, and traditional solutions fail to maintain a desirable white color or resist pH degradation, leading to water wastage and user dissatisfaction.
Innovation Solution
A descaling formulation using a viscosifying agent combination of quaternary ammonium salts and strong aromatic organic acid salts, along with a pigmenting agent of colloidal styrene-acrylic copolymer, and a descaling agent like hydrochloric acid, which maintains stability and prevents yellowing, ensuring effective encrustation removal without colored residues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional viscosifying systems (ethoxylated fatty amines and ethoxylated amine oxides) are used to reduce flowing speed and increase contact time, then descaling effectiveness is improved, but the formulation develops dark yellow to reddish colouring that persists on ceramic surfaces
Solution Approach 1:
The patent changes the chemical parameters of the viscosifying system by replacing traditional ethoxylated fatty amines with a specific quaternary ammonium salt (hexadecyltrimethylammonium chloride) combined with a specific anionic surfactant (dodecylbenzenesulfonic acid sodium salt). This parameter change maintains the viscosity-increasing function while eliminating the yellowing side effect, as the new surfactant combination is resistant to oxidation and pH-induced coloration.
Solution Approach 2:
The patent creates a composite viscosifying system by combining a cationic surfactant (quaternary ammonium salt) with an anionic surfactant (aromatic organic acid salt). This composite approach produces synergistic effects where the combination provides both the desired thickening effect and resistance to color degradation, solving the problem of colored residues while maintaining descaling effectiveness.
2Illumination intensity
If blue or green dyes are added to mask the yellow/red colouring, then aesthetic appearance is improved, but water consumption increases due to multiple flushings required to eliminate colour residues
Solution Approach 1:
The patent extracts and eliminates the root cause of the problem by removing the traditional viscosifying agents (ethoxylated fatty amines) that cause yellowing. By taking out the problematic component and replacing it with a non-yellowing alternative, the need for masking dyes and subsequent water flushings is eliminated, thus reducing water consumption while maintaining aesthetic appearance.
3Illumination intensity
If titanium dioxide or other mineral fillers are used as white pigmenting agents, then white color is achieved, but the pigment dissolves completely under extreme pH conditions (pH < 1)
Solution Approach 1:
The patent changes the chemical nature of the pigment from inorganic (titanium dioxide) to organic (styrene-acrylic copolymer). This parameter change in material composition provides resistance to acid dissolution, as the cross-linked polymer structure remains stable at extreme pH values where mineral fillers would dissolve, thereby maintaining white color stability.
Solution Approach 2:
The patent uses a composite polymer system (styrene-acrylic copolymer) that combines the properties of both styrene and acrylic components to create a pigment with enhanced chemical resistance. This composite material provides both the desired white color and stability under extreme pH conditions that dissolve traditional mineral fillers.
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 formulation effectively removes calcium carbonate encrustations without leaving colored residues, maintaining a stable white color and reducing water consumption, thus addressing the limitations of existing products while ensuring efficient descaling performance.
Implementation Method 1
a viscosifying agent consisting of a cationic surfactant and an anionic surfactant selected, respectively, from quaternary ammonium salts and salts of strong aromatic organic acids
Implementation Method 2
a pigmenting agent consisting of, or comprising a colloidal aqueous dispersion of an inert organic polymer consisting of a styrene-acrylic copolymer
Implementation Method 3
a descaling agent selected from hydrochloric acid, phosphoric acid, sulfuric acid or sulfamic acid, preferably hydrochloric acid
Data Source
Figure 1~2
AI summary
A descaling formulation is described for application on the surface of bathroom fixtures, preferably for application on WCs.