Method for cleaning clothing
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Solution Overview
Problem
Conventional detergents with alkaline optimal pH for protease activity are less effective at weakly acidic to weakly alkaline pH levels, limiting their detergent properties against protein-based stains.
Innovation Solution
A method using a combination of internal olefin sulfonates with specific carbon chain lengths and sulfonate group positions, along with protease, to maintain detergent activity across a pH range of 3.5 to 8.5, enhancing the detergent's ability to remove protein-based stains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional detergents with alkaline optimal pH are used, then protease activity is high, but detergent property against protein-based stains deteriorates at weakly acidic to weakly alkaline pH levels
Solution Approach 1:
The invention changes the pH parameter range of the detergent liquid from conventional alkaline conditions to weakly acidic to weakly alkaline conditions (pH 3.5-8.5), while maintaining protease activity through the specific combination of internal olefin sulfonate and protease. This allows the detergent to effectively remove protein-based stains in a broader pH range including weakly acidic conditions where conventional alkaline detergents fail.
2Ease of manufacture
If alkylbenzene sulfonate is used as detergent component, then detergent property is conventional, but detergent activity at weakly acidic to weakly alkaline pH levels is reduced
Solution Approach 1:
The invention uses a composite detergent composition combining internal olefin sulfonate (a specific type of sulfonate) with protease. This composite approach creates a synergistic effect where the internal olefin sulfonate provides effective surfactant properties at weakly acidic to weakly alkaline pH levels, while the protease maintains protein-stain degradation capability, achieving both ease of manufacture and reliable detergent activity.
3Adaptability or versatility
If pH of detergent liquid is adjusted to weakly acidic to weakly alkaline range, then adaptability expands, but protease activity may decrease
Solution Approach 1:
The internal olefin sulfonate acts as an intermediary that enables protease to function effectively at weakly acidic to weakly alkaline pH levels. The specific combination of internal olefin sulfonate with protease creates a system where the sulfonate provides a protective or stabilizing environment that allows the protease to maintain its catalytic activity outside its traditional alkaline optimal range, thus expanding pH adaptability without sacrificing enzyme reliability.
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 method ensures excellent detergent activity even at weakly acidic to weakly alkaline pH levels, outperforming conventional alkylbenzene sulfonates and maintaining protease effectiveness, thus expanding the pH range for effective stain removal.
Implementation Method 1
Protease is also used as a component to increase the detergent property against stains attached to clothing. Many proteases generally have an alkaline optimal pH.
Implementation Method 2
Protease is also used as a component to increase the detergent property against stains attached to clothing. Many proteases generally have an alkaline optimal pH.
Implementation Method 3
an internal olefin sulfonate, particularly an internal olefin sulfonate obtained by using, as a raw material, an internal olefin having a double bond not at the end of an olefin chain but inside the olefin chain have been widely used as household and industrial detergent components
Data Source
AI summary
The present invention relates to a method for washing clothing, including washing clothing with a detergent liquid having a pH of 3.5 or more and 8.5 or less at 20°C obtained by mixing the following component (A) and component (B), and water having a hardness: component (A): an internal olefin sulfonate having 15 or more and 24 or less carbon atoms; and component (B): protease.