Catechol Metal Complex Dyes Prevent Textile Discoloration
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Solution Overview
Problem
Conventional detergents often result in undesirable textile discoloration due to the absorption of dyes during the washing process, leading to irreversible stains, especially from polyphenolic compounds like those found in food products, which can cause issues with polymerizable substances such as anthocyanidins or anthocyanins.
Innovation Solution
The use of catechol metal complex compounds as dyes in detergents, which have a low affinity for natural and synthetic fabrics, providing intense color stability while preventing textile discoloration and offering effective bleaching performance against polymerizable stains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional dyes are used in detergents to achieve intense color, then the detergent becomes visually appealing and consumers are satisfied, but the dye transfers to the fabric during washing, causing discoloration and damage
Solution Approach 1:
The patent changes the chemical structure of the dye from conventional organic dyes to catechol metal complex compounds with specific molecular formulas containing metal ions (Fe, Mn, Co, Ni, Cu, Zn) coordinated with catechol ligands. This structural parameter change fundamentally alters the interaction with textiles, maintaining color intensity while eliminating dye transfer and discoloration effects.
Solution Approach 2:
The invention uses composite catechol metal complex compounds combining organic catechol ligands with inorganic metal ions to create a hybrid dye molecule. This composite structure provides both the desired color properties and the unique property of low affinity for natural and synthetic fabrics, preventing textile damage while maintaining visual appeal.
2Illumination intensity
If high concentrations of dyes are used to achieve vibrant color, then the detergent appears more intense and attractive, but the risk of textile staining and discoloration increases
Solution Approach 1:
The patent changes the chemical nature of the dye from conventional high-concentration organic dyes to catechol metal complex compounds. These complexes inherently provide stable coloration that does not transfer to fabrics, allowing the detergent to maintain vibrant appearance without compromising textile safety even at effective concentrations.
Solution Approach 2:
The catechol metal complex compounds serve as a disposable dye solution that performs its function during the washing cycle and then decomposes or rinses away without leaving harmful residues or causing long-term textile damage. The metal complex structure ensures temporary, non-persistent binding that prevents permanent staining.
3Illumination intensity
If conventional dyes are used to provide color, then the detergent achieves the desired appearance, but the dyes can be absorbed by textiles causing irreversible discoloration that cannot be removed
Solution Approach 1:
The patent fundamentally changes the chemical parameters of the dye by using catechol metal complex compounds with specific coordination chemistry. The metal ion coordination creates a stable complex that does not interact strongly with textile fibers, preventing absorption and irreversible discoloration while maintaining the desired color intensity through the complex's inherent optical properties.
Solution Approach 2:
The invention converts the potential harm of dye absorption into a benefit by designing catechol metal complexes that deliberately avoid binding to textiles. The metal complex structure provides coloration without the harmful side effect of textile staining, turning what would normally be a harmful interaction into a harmless one.
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 catechol metal complex compounds ensure that detergents maintain their color and do not transfer dye to textiles, effectively removing tough stains containing polyphenolic compounds without causing discoloration, while also providing a good bleaching effect.
Implementation Method 1
The use of these special catechol metal complex compounds reduces the risk of unwanted textile staining, as these complex compounds exhibit a very low affinity for natural and synthetic fabrics
Implementation Method 2
detergents containing the catechol-metal complex compounds according to the invention exhibit good bleaching activity in the presence of an excess of free catechol ligand
Data Source
AI summary
Catechol metal complex compounds of formula (I), wherein R1 and R2 independently of one another represent a hydrocarbon radical having 1 to 20 carbon atoms which is optionally substituted with at least one radical selected from hydroxyl, (C1-C4)-alkoxy, (C1-C4)-alkoxy(CH2CH20)n-, -NR R" or -N+R'R"R"' X-, wherein n = 1 to 10, R', R" and R''' independently of one another represent H or a linear or branched aliphatic hydrocarbon radical having 1 to 3, preferably 1 to 2, carbon atoms and X- represents an anion, Z1 and Z2 independently of one another represent OH or O", M represents a metal cation of a transition metal or lanthanoid (especially a metal cation selected from Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Fe, Ru, Co, Ni, Cu, Zn, Ce or Sm), q as the charge number of the metal cation M represents a number 2, 3 or 4, p as the charge number of the catechol ligand represents a number 0, 1 or 2, r represents a number 1, 2, 3 or 4, are colored and may be used for coloring of surfactant compositions. Laundry detergents containing these catechol metal complex compounds do not lead to textile coloring even after repeated use.