Low-VOC cleaning substrates comprising a quat and ethoxylated/propdxylated fatty alcohol
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Solution Overview
Problem
Conventional cleaning compositions with high levels of volatile organic compounds (VOCs) face issues such as skin irritation, incomplete quat release from cleaning wipes, residue and streaking on surfaces, and regulatory challenges, while low-VOC formulations struggle to maintain cleaning efficacy and visual cleanliness.
Innovation Solution
A cleaning composition with a cationic biocide, non-ionic surfactant, and glycol ether solvent, formulated to have a cloud point below 85°F, which undergoes dewetting and phase separation upon drying, creating a regular micron-structure that is invisible to the human eye, thus minimizing residue and streaking while maintaining low VOC levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high levels of VOC solvents (1-40% by weight) are used in cleaning compositions, then cleaning efficacy and quat release from wipes are improved, but skin irritation increases and regulatory compliance deteriorates
Solution Approach 1:
The patent changes the concentration parameter of VOC solvents from high levels (1-40%) to low levels (<5%), and adjusts the surfactant composition (specifically using ethoxylated/propoxylated fatty alcohols with 10-50 combined EO/PO units) to maintain cleaning efficacy at lower VOC concentrations. This parameter change resolves the contradiction by reducing skin irritation and regulatory issues while preserving cleaning performance.
Solution Approach 2:
The patent uses a composite surfactant system combining ethoxylated and propoxylated fatty alcohols in specific ratios, along with co-surfactants and low-VOC solvents, to create a synergistic formulation that maintains high cleaning efficacy and quat release without relying on high VOC concentrations. This composite approach allows reduction of harmful VOC levels while preserving functional performance.
2Object-affected harmful factors
If low-VOC formulations (<5% VOC) are used to reduce skin irritation and meet regulations, then safety and compliance are improved, but cleaning efficacy and visual cleanliness deteriorate
Solution Approach 1:
The patent modifies the surfactant molecular structure parameters by using ethoxylated/propoxylated fatty alcohols with specific EO/PO unit combinations (10-50 units) and adjusting the HLB balance, which enhances cleaning performance and residue properties even at low VOC concentrations. This allows low-VOC formulations to achieve high cleaning efficacy without the traditional need for high VOC content.
Solution Approach 2:
The patent creates specific local properties in the surfactant molecules through controlled ethoxylation and propoxylation degrees, producing surfactants with optimized hydrophilic-lipophilic balance that enable effective cleaning and low-residue performance specifically at low VOC concentrations, rather than uniformly across all formulation types.
3Reliability
If high concentrations of quat are used to ensure adequate biocide transfer from wipes, then antimicrobial efficacy is improved, but product cost increases and skin irritation worsens
Solution Approach 1:
The patent introduces specific surfactants (ethoxylated/propoxylated fatty alcohols) as intermediary substances that facilitate quat release from the wipe substrate. These surfactants act as mediators between the quat biocide and the surface, enabling efficient quat transfer at lower quat concentrations, thereby reducing product cost and skin irritation while maintaining antimicrobial efficacy.
Solution Approach 2:
The patent replaces the mechanical reliance on high quat concentrations to ensure adequate biocide transfer with a chemical mechanism involving surfactant-mediated release. The surfactant system chemically facilitates quat detachment and transfer from the wipe, substituting the need for high quat loading with a more efficient chemical transfer mechanism.
4Reliability
If isopropyl alcohol (>12%) is added to improve quat release from wipes, then biocide transfer is improved, but VOC levels increase and cost considerations worsen
Solution Approach 1:
The patent changes the solvent system parameters by replacing or supplementing isopropyl alcohol with low-VOC alternative solvents and adjusting the surfactant composition to achieve effective quat release without exceeding low-VOC thresholds. This maintains biocide transfer efficiency while keeping VOC content below 5%.
Solution Approach 2:
The patent uses cost-effective surfactant systems (fatty alcohol ethoxylates/propoxylates) that provide sustained quat release functionality without requiring expensive high-VOC solvent systems. These surfactants offer a economical, disposable-like solution in the formulation that maintains performance while reducing VOC content and overall formulation cost.
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 achieves excellent cleaning performance with low VOC levels, reducing residue and streaking, and is cost-effective, meeting regulatory standards and consumer expectations for cleanliness.
Implementation Method 1
formulated to have a cloud point below 85°F, which undergoes dewetting and phase separation upon drying, creating a regular micron-structure
Implementation Method 2
undergoes dewetting and phase separation upon drying, creating a regular micron-structure
Data Source
AI summary
A cleaning composition for sanitizing and/or disinfecting hard surfaces, comprising: a cationic biocide, surfactant and low levels of VOC solvents. The cleaning composition is adapted to clean a variety of hard surfaces without leaving behind a visible residue and creates low levels of streaking and filming on the treated surface. The cleaning composition contains less than 5% by weight of VOCs. The cleaning composition may be used alone as a liquid or spray formulation or in combination with a substrate, for example, a pre-loaded cleaning wipe.