Detergent Composition with Lipase and Shading Dyes
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Solution Overview
Problem
White fabrics tend to develop a yellowish tinge over time due to incomplete soil removal and sebum deposition, which existing detergent compositions with shading dyes and lipase do not effectively address, especially in multiple washes on cotton and polyester fabrics.
Innovation Solution
A detergent composition comprising a surfactant, hydrophobic dye, direct dye, acid dye, and lipase, which is applied in an aqueous solution to treat fabrics, followed by rinsing and drying, to reduce soil redeposition and maintain fabric whiteness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If shading dyes are used to mask yellowish tinge on white fabrics, then fabric whiteness is improved, but dye deposition is reduced when soil or sebum accumulates on fabrics
Solution Approach 1:
The patent introduces lipase as an intermediary substance that mediates between the soil/sebum accumulation problem and the dye deposition requirement. The lipase enzyme breaks down triglycerides in sebum and oily soils into free fatty acids, monoglycerides, and diglycerides, creating a cleaner fabric surface that facilitates consistent dye deposition while maintaining fabric whiteness through the shading effect
2Productivity
If lipase is used to enhance grease removal, then cleaning performance is improved, but malodour is generated due to hydrolysis of triglycerides
Solution Approach 1:
The patent converts the harmful malodorous volatile fatty acids produced by lipase action into a beneficial outcome. By combining lipase with shading dyes, the composition achieves enhanced grease removal while the shading dyes mask any potential yellowing, and the overall system promotes better fabric cleanliness and dye deposition, transforming the potential harm into an overall beneficial cleaning performance
3Productivity
If multiple washes are performed on white fabrics, then fabric cleanliness is maintained, but yellowing increases over time
Solution Approach 1:
The patent implements continuous useful action by combining lipase and shading dyes in a single detergent composition that works synergistically across multiple wash cycles. The lipase continuously breaks down greasy soils while the shading dyes continuously deposit to mask yellowing, creating an ongoing protective effect that maintains fabric brightness over extended use and multiple washes
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 effectively reduces soil redeposition and yellowing, as evidenced by higher reflectance and lower yellowing indices on knitted cotton, knitted polyester, and polyester fabrics, especially after multiple washes.
Implementation Method 1
Lipase catalyses hydrolysis of triglycerides which form a major component of many commonly encountered fatty soils such as sebum, animal fats (e.g lard, ghee, butter) and vegetable oils
Implementation Method 2
They absorb ultra violet light and emit visible light causing yellowed garments to look brighter. These dyes add a blue tint to fabrics, thereby masking the yellowish tinge
Implementation Method 3
They absorb ultra violet light and emit visible light causing yellowed garments to look brighter
Data Source
AI summary
A detergent composition having shading dyes and lipase The invention relates to detergent compositions having shading dyes and lipase. It has been determined that combination of lipase with specific shading dyes provides lower redeposition of soil. This is manifested as higher reflectance and lower yellowing, especially over multiple washes on knitted cotton, knitted polyester and polyester fabrics, Disclosed is a detergent composition comprising: (i)a surfactant; (ii)a hydrophobic dye; (iii)a direct dye; (iv)an acid dye; and, (v)lipase.