Laundry Sour Composition with Weak Organic Acids for Iron Control
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Solution Overview
Problem
Current laundry sour compositions for removing residual alkali and controlling iron deposition often use environmentally undesirable and hazardous strong acids, which can damage fabrics and pose skin irritation risks.
Innovation Solution
A linen treatment composition comprising a hydroxycarboxylic acid, an acid source (organic or inorganic), and optionally a carboxylate polymer, which is used as a pre-spot, pre-treatment, pre-soak, wash, or post-wash sour treatment to neutralize remaining alkalis and prevent iron deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If strong acids (fluoroacetic acid, phosphoric acid, hydrofluoric acid, hexafluorosilicic acid) are used in laundry sour compositions to neutralize residual alkali and control iron deposition, then iron control and alkali neutralization effectiveness is improved, but environmental harm and hazardous chemical exposure increase
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, malic acid). This parameter change maintains the acid neutralization function while eliminating the environmental and safety hazards associated with strong acids, thus resolving the contradiction between effectiveness and environmental harm
Solution Approach 2:
The patent employs readily biodegradable organic acids that break down naturally into harmless substances (carbon dioxide, water, and organic byproducts). These short-living acid molecules perform their neutralization function and then decompose, avoiding the persistent environmental contamination caused by strong mineral acids, thereby resolving the contradiction between effectiveness and environmental persistence
2Reliability
If strong acids are used in laundry sour compositions to neutralize residual alkali, then alkali neutralization effectiveness is improved, but fabric damage and skin irritation risks increase
Solution Approach 1:
The patent changes the strength parameter of the acid from strong mineral acids (pH < 1) to weak organic acids (pH 3-5). This parameter change provides sufficient neutralization capability to bring residual alkali to near-neutral pH while the gentler acid strength prevents hydrolysis of fabric cellulose and protein structures, thus resolving the contradiction between neutralization effectiveness and fabric damage
Solution Approach 2:
The patent converts the previously harmful strong acid into a beneficial weak acid system. The weak organic acids provide the necessary acidity for neutralization while their biodegradability and low corrosivity transform them from potential fabric-damaging agents into safe, effective treatment components, resolving the contradiction between neutralization effectiveness and fabric safety
3Reliability
If strong acids are used in laundry sour compositions to control iron deposition, then iron control effectiveness is improved, but skin irritation hazards increase
Solution Approach 1:
The patent changes the pH parameter from highly acidic (strong mineral acids) to mildly acidic (weak organic acids). This parameter change maintains sufficient acidity to prevent iron yellowing by neutralizing residual alkali and creating an unfavorable environment for iron oxidation, while the higher pH level eliminates the severe skin irritation and chemical burn risks associated with strong acids
Solution Approach 2:
The patent uses biodegradable organic acids that break down rapidly into non-irritating substances. These short-living acid molecules perform their iron control function through neutralization and then decompose into safe byproducts, eliminating the persistent skin irritation hazards associated with strong mineral acids, thus resolving the contradiction between iron control effectiveness and skin safety
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, prevents yellowing caused by iron deposition, and is environmentally friendly and sustainable, outperforming commercially available alternatives in terms of iron control and fabric whiteness.
Implementation Method 1
The composition effectively neutralizes residual alkalis
Implementation Method 2
prevents yellowing caused by iron deposition
Data Source
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.