Phenolic Antioxidant Laundry Composition for Percarbonate–Dye Compatibility
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Solution Overview
Problem
The reactivity between percarbonate-based bleach systems and hueing dyes in laundry detergents negatively affects the whiteness performance of fabrics, limiting the capacity of percarbonate use without detrimental effects on hueing dye performance.
Innovation Solution
Incorporating a specific phenolic antioxidant into the detergent composition, which reduces the reactivity between percarbonate and hueing dye, allowing for a higher percarbonate capacity without impacting hueing dye performance, by forming a wash liquor with controlled pH and specific concentrations of detersive surfactant, phenolic antioxidant, percarbonate, and hueing dye.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If percarbonate capacity is increased to improve cleaning performance, then stain removal capability is improved, but hueing dye performance deteriorates due to increased reactivity between percarbonate and hueing dye
Solution Approach 1:
A phenolic antioxidant is introduced as an intermediary substance that selectively reacts with percarbonate to form a peroxide complex, thereby mediating the interaction between percarbonate and hueing dye. This intermediary mechanism allows the percarbonate's bleaching capability to be preserved while preventing direct detrimental reactions with the hueing dye, resolving the contradiction between cleaning performance and dye stability
Solution Approach 2:
The chemical state of the percarbonate system is changed by introducing the phenolic antioxidant, which alters the reactivity parameters of the system. The antioxidant modifies the percarbonate's interaction characteristics with other components, enabling higher percarbonate concentrations to be used without proportionally increasing harmful reactions with hueing dye, thus changing the system's chemical parameters to resolve the contradiction
2Illumination intensity
If percarbonate concentration is increased to enhance whiteness performance, then stain removal is improved, but reactivity with hueing dye increases causing detrimental effects
Solution Approach 1:
The phenolic antioxidant serves as a protective intermediary that preferentially interacts with percarbonate, forming a complex that reduces the percarbonate's reactivity toward hueing dye. This intermediary mechanism allows high percarbonate concentrations to be maintained for whiteness enhancement while the antioxidant shields the hueing dye from excessive reactivity, thus resolving the contradiction between whiteness performance and harmful reactivity
Solution Approach 2:
The potential harmful reactivity between percarbonate and phenolic antioxidant is converted into a beneficial effect. The antioxidant's reaction with percarbonate creates a controlled peroxide complex that maintains bleaching efficacy for whiteness enhancement while reducing uncontrolled reactivity with hueing dye, thus converting what could be a harmful interaction into a protective mechanism
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
Enhances the capacity of percarbonate use in the presence of hueing dye without detrimental effects on hueing dye performance, improving fabric cleaning efficacy while maintaining whiteness.
Implementation Method 1
the addition of specific phenolic antioxidant into a laundry detergent that comprises percarbonate and hueing dye, decreases the reactivity between the percarbonate and the hueing dye
Data Source
AI summary
The present invention relates to a method of laundering fabric comprising the steps of: (a) contacting a detergent composition comprising: (i) detersive surfactant; (ii) phenolic antioxidant (iii) percarbonate; (iv) optionally, a bleach activator capable of forming C1-C11 alkyl substituted peroxycarboxylic acid; and (iv) hueing dye, with water to form a wash liquor comprising from 60ppm to 2750ppm detersive surfactant, from 0.1ppm to 200ppm phenolic antioxidant, from 10ppm to 3000ppm percarbonate, optionally from 2ppm to 1000ppm bleach activator, and from 0.005 to 500pm hueing dye, and from 0.001ppm to 10.0ppm iron, and having a pH in the range of from greater than 7.0 to 12.0; (b) contacting fabric with the wash liquor; and (c) laundering the fabric.