Laundry Detergent Soil Release Polymer Anti-Redeposition
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Solution Overview
Problem
Conventional detergents fail to effectively remove heavy grease stains from clothing in a single wash cycle and often result in re-deposition of grease onto the washing machine components, leading to transfer to subsequent loads of clothes.
Innovation Solution
A heavy-duty detergent formulation comprising builders, enzymes, surfactants, a solvent, a biocide, and a soil release polymer, with the soil release polymer present from 0.6 to 5.5 weight percent, which imparts anti-soil re-deposition properties to prevent soil from redepositing onto clothing or the washing machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional detergent formulations are used, then the detergent can remove some grease stains, but they fail to effectively remove heavy grease stains and result in re-deposition of grease onto washing machine components
Solution Approach 1:
The patent introduces soil release polymers as intermediary substances that mediate between the grease soil and the fabric/washing machine surfaces. These polymers have specific molecular structures that preferentially bind to grease particles and prevent their re-adhesion to surfaces, effectively acting as a mediator that keeps soil in suspension and facilitates its removal without re-deposition
Solution Approach 2:
The detergent formulation employs a composite surfactant system combining multiple types of surfactants (anionic, nonionic, and amphoteric) with soil release polymers. This composite approach creates synergistic effects where different surfactant types work together to address various aspects of grease removal, while the soil release polymer component prevents re-deposition, achieving both improved cleaning and anti-redeposition in a single formulation
2Reliability
If multiple wash cycles are used to remove heavy grease stains, then more grease can be removed, but this increases time consumption and may still result in re-deposition
Solution Approach 1:
The soil release polymers are incorporated into the detergent formulation in advance, performing preliminary anti-redeposition action before the washing cycle begins. This pre-positioned protective layer on fabrics and washing machine surfaces prevents grease from re-adhering during and after the wash, eliminating the need for multiple cycles to address re-deposition issues
Solution Approach 2:
The formulation maintains continuous anti-redeposition protection throughout the entire washing process and beyond. The soil release polymers continue to function during the wash cycle, rinse, and even after drying, providing ongoing protection against grease re-deposition. This continuous action ensures complete grease removal in a single cycle without time loss from repeated washing
3Device complexity
If conventional detergents are used, then the formulation can be simple, but they lack anti-soil re-deposition properties
Solution Approach 1:
The soil release polymers perform multiple functions within the detergent system: they act as anti-redeposition agents, fabric softeners, and static reduction agents. This multi-functionality means that a single additive component addresses several different needs, preventing grease re-deposition while also providing fabric care benefits, thereby reducing the need for multiple separate additives and keeping the overall formulation relatively simple
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 formulation effectively removes heavy grease and automotive soils from clothing while preventing re-deposition onto clothing or washing machine components, maintaining cleaning performance and storage stability for at least four months.
Implementation Method 1
a soil release polymer present from 0.6 to 5.5 weight percent, where the soil release polymer imparts anti soil re-deposition properties so that soil does not redeposit back onto the clothing or the washing machine
Implementation Method 2
The polar component allows the detergent to dissolve in the water, whereas the nonpolar portion solubilizes greasy ('hydrophobic') materials that are the usual target of the cleaning process
Implementation Method 3
Enzymes are macromolecular biological catalysts. Enzymes accelerate, or catalyze, chemical reactions. The amounts of enzyme typically may be up to about 2% by weight of a detergent product, and are required to degrade recalcitrant stains composed of proteins, fats, or carbohydrates
Implementation Method 4
Builders are water softeners, whose chemical compounds are agents that remove calcium ions by complexation or precipitation
Data Source
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AI summary
A laundry detergent formulation is provided that is formed as an aqueous blend of surfactants, enzymes, builders and soil release polymers to inhibit soil re-deposition back onto other clothing or elements of the washing machine. The detergent formulation also contains additives with properties that impart a treatment to fabrics that inhibits future soil deposition onto the clothing with continued use. The detergent formulation provides cleaning of heavy duty grease and automotive soils from clothing surfaces that is superior to current detergent products.