Laundry Sour Composition for Iron Control Without Strong Acids

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Solution Overview

Problem

Current laundry processes face challenges in removing residual alkali and controlling iron deposition, leading to fabric damage and skin irritation, with existing solutions using environmentally undesirable and hazardous strong acids.

Innovation Solution

A phosphorus-free linen treatment composition comprising hydroxycarboxylic acid, an acid source, and optionally a carboxylate polymer, which can be used as a pre-treatment, pre-soak, or post-wash treatment to neutralize alkalis and prevent iron deposition, formulated to be environmentally friendly and sustainable.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If strong acids (fluoroacetic acid, phosphoric acid, hydrofluoric acid, hexafluorosilicic acid) are used in laundry sour compositions, then iron control and alkalinity neutralization are effective, but environmental safety and chemical hazard levels deteriorate

Engineering Contradiction:

Improveiron control effectivenessVSAvoidenvironmental safety

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical parameters by substituting strong mineral acids with weak organic acids (lactic acid, citric acid, acetic acid, gluconic acid). This parameter change maintains the acidification function needed for iron control and alkalinity neutralization while dramatically improving environmental safety and reducing chemical hazards.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs biodegradable organic acids that naturally decompose into harmless substances (carbon dioxide, water, and organic byproducts). These acids are effectively 'disposable' in the sense that they break down rapidly in the environment, unlike persistent strong acids that accumulate and cause long-term harm.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Reliability

If high levels of caustic are used to remove blood soils, then stain removal effectiveness is improved, but fabric damage and skin irritation risks increase

Engineering Contradiction:

Improvestain removal effectivenessVSAvoidfabric damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies a preliminary sour treatment before or during the washing process to neutralize alkalinity and control iron deposition. This preliminary action prevents the need for excessive caustic in subsequent steps, thereby protecting fabric integrity while still achieving effective stain removal.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Instead of using only high-level caustic to remove stains (the conventional approach), the patent inverts the strategy by first applying a sour treatment to create a balanced chemical environment. This inversion allows for effective stain removal at lower, safer caustic levels.

Inventive Principle:

Principle #13The other way round (Inversion)

3Productivity

If residual alkali remains in laundered items, then washing efficiency is maintained, but fabric damage and skin irritation occur

Engineering Contradiction:

Improvewashing efficiencyVSAvoidskin irritation

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a sour composition as an intermediary substance that mediates between the alkaline detergent and the fabric/skin. This intermediary neutralizes residual alkali through acid-base reaction, preventing direct contact between harmful alkali and the fabric or skin while maintaining washing efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Reliability

If iron is not properly controlled during washing, then iron-containing stains can be removed, but permanent yellowing of fabrics occurs

Engineering Contradiction:

Improvestain removal capabilityVSAvoidfabric yellowing

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent ensures continuous iron control throughout the washing process by incorporating the sour composition in a manner that maintains acidic conditions during critical phases. This continuous action prevents iron oxidation and deposition that would otherwise cause yellowing, while still allowing effective stain removal.

Inventive Principle:

Principle #20Continuity of useful action

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 neutralizes residual alkalis and prevents iron deposition, reducing fabric yellowing and skin irritation while being safer for the environment compared to traditional methods.

Implementation Method 1

The composition can help to neutralize remaining alkalis

Methodology Applied

Scientific EffectAcid-base reaction:

Implementation Method 2

helps to prevent iron deposition on the linen

Methodology Applied

Scientific EffectChelation:

Data Source

PatentUS9783767B2Sustainable laundry sour compositions with iron control

Publication Date: 2017.10.10 ECOLAB USA INC

AI summary

Linen treatment compositions and linen processes are disclosed which help to prevent iron deposition from wash water, and/or redeposition after iron containing stain (such as blood) removal by alkaline detergents. The linen treatment composition is a combination of a hydroxycarboxylic acid and an acid source, which may be organic or inorganic. The invention provides for effective iron control in a phosphorus-free formula that is also free of toxic or hazardous chemicals and includes sustainable, environmentally friendly ingredients, while still providing effective iron control.