Carpet Cleaning Composition with Cationic Bactericide Compatibility
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Solution Overview
Problem
Cationic bactericides have compatibility issues with anionic surfactants, leading to reduced cleaning performance and fabric damage, and pose risks due to toxicity and corrosiveness, while existing alternatives like phenols, aldehydes, and halogens have carcinogenic concerns and other drawbacks.
Innovation Solution
A carpet cleaning detergent composition containing a cationic compound with specific counterion properties, compatible with anionic surfactants, that maintains bactericidal activity and prevents soil re-deposition, using quaternary ammonium salts and other bactericides in controlled concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cationic bactericide compounds are used, then bactericidal efficacy is improved, but compatibility with anionic surfactants deteriorates
Solution Approach 1:
The patent introduces non-ionic surfactants as intermediary substances that mediate between cationic bactericides and anionic surfactants. These non-ionic surfactants act as bridges, allowing the cationic bactericide to maintain its efficacy while being compatible with the anionic surfactant system, thus resolving the compatibility issue without sacrificing bactericidal performance
Solution Approach 2:
The patent creates a composite surfactant system combining cationic bactericides, non-ionic surfactants, and anionic surfactants in specific proportions. This composite formulation allows the cationic compound to function effectively while the non-ionic component prevents negative interactions with anionic surfactants, achieving both bactericidal efficacy and compositional stability
2Reliability
If cationic bactericide compounds are used, then bactericidal efficacy is improved, but cleaning performance deteriorates
Solution Approach 1:
Non-ionic surfactants serve as intermediaries that protect the cleaning performance while allowing cationic bactericides to function. These intermediaries ensure that the cationic compound does not negatively impact the cleaning action of anionic surfactants, thus maintaining both bactericidal efficacy and cleaning performance
Solution Approach 2:
The patent optimizes the concentration parameters of different surfactant types to achieve the right balance. By carefully controlling the proportions of cationic, non-ionic, and anionic surfactants, the formulation maintains effective cleaning performance while preserving the bactericidal activity of the cationic compound
3Reliability
If cationic bactericide compounds are used, then bactericidal efficacy is improved, but fabric damage increases
Solution Approach 1:
Non-ionic surfactants act as protective intermediaries that reduce the harmful effects of cationic bactericides on fabric surfaces. They mitigate the stickiness and corrosiveness issues while allowing the cationic compound to maintain its bactericidal function, thus reducing fabric damage
Solution Approach 2:
The patent adjusts the concentration and formulation parameters to minimize fabric damage. By optimizing the ratio of cationic to non-ionic to anionic surfactants, the formulation achieves effective bactericidal action while reducing the harmful effects on fabric surfaces
4Reliability
If phenols and aldehydes are used as bactericides, then bactericidal efficacy is improved, but toxicological impact worsens
Solution Approach 1:
The patent employs quaternary ammonium salts as alternative bactericides that are less toxic but require higher concentrations and longer contact times. These compounds act as disposable agents that provide effective bactericidal action without the carcinogenic concerns of phenols and aldehydes, though they do have their own limitations that need to be managed through proper formulation
5Reliability
If chlorine is used as bactericide, then bactericidal efficacy is improved, but corrosiveness worsens
Solution Approach 1:
The patent uses quaternary ammonium salts as alternative to chlorine that provide effective bactericidal action without the corrosiveness and decolourisation issues. These compounds are less harmful to metal surfaces and fabrics, though they do have their own limitations regarding stability and compatibility that are managed through the composite surfactant formulation
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 composition achieves effective bactericidal action with reduced toxicological impact and fabric damage, maintaining cleaning performance and preventing soil re-deposition, suitable for both liquid and powder forms.
Implementation Method 1
Certain cationic compounds... are well known actives able to provide good disinfecting efficacy... but have in general low compatible with anionic surfactants or anionic species in general. Cationic compounds tend to precipitate with anionic compounds or lose their bactericide efficacy due to the formation of an anionic-cationic complex
Implementation Method 2
Certain cationic compounds... are well known actives able to provide good disinfecting efficacy both versus gram negative and gram positive bacteria
Implementation Method 3
a (preferably cationic) resoil prevention polymer
Data Source
AI summary
A carpet cleaning detergent comprises:a) 0.001% to 40% w/v of a bactericidally active water-insoluble cationic compound in its salt form;b) 0.001 to 40% w/v of an anionic surfactant;c) 0.1 to 10 wt % bleach;d) a resoil prevention polymer;ande) up to 98% w/v of water.