Low-Melting Biocidal Formulation for Coating Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing biocidal compositions for coatings face challenges such as rapid leaching of low-water-solubility active ingredients, particle size variability affecting microbiological efficacy, and exposure risks in handling powders, along with limitations in concentration and VOC emissions in solvent-based solutions.
Innovation Solution
A stable low-melting biocidal composition comprising 50-70% 4,5-dichloro-2-octyl-3(2H)-isothiazolone, 20-30% 3-iodopropargyl-N-butyl carbamate, and 5-30% C1-C4 alkyl 4-hydroxybenzoate, formulated as an aqueous dispersion with surfactants, fillers, and thickeners to minimize VOC and enhance distribution and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If powder form biocides are used to protect coatings, then low water solubility prevents rapid leaching, but handling involves significant toxic dust exposure risk and particle size variation limits microbiological efficacy
Solution Approach 1:
The patent changes the physical state parameter of the biocidal composition from solid powder to liquid form (aqueous dispersion). This is achieved by formulating the biocides in a liquid carrier system, eliminating dust generation during handling while maintaining the low water solubility characteristic that prevents rapid leaching from coatings.
Solution Approach 2:
The patent uses an aqueous dispersion system (liquid phase) to replace solid powder handling. The biocidal ingredients are dispersed in water with appropriate surfactants and thickeners to create a stable liquid formulation, which eliminates aerosolization and dust exposure risks associated with powder application.
2Object-affected harmful factors
If concentrated solutions in organic solvents are prepared, then handling safety is improved, but concentration is limited and considerable VOC is introduced into the environment
Solution Approach 1:
The patent changes the solvent system parameter from organic solvents to water-based aqueous dispersion. This substitution eliminates VOC emissions while maintaining the ability to formulate concentrated biocidal compositions. The liquid state allows for high concentration without the limitations of organic solvent solubility.
Solution Approach 2:
The patent replaces expensive organic solvent systems with a water-based system that is environmentally benign. Water serves as the carrier medium, eliminating the need for volatile organic compounds while achieving the same functional purpose of dissolving and distributing the biocidal ingredients.
3Quantity of substance
If flowable aqueous dispersions are used, then concentration is improved and VOC is reduced, but stable low-melting mixtures containing specific biocides have not been achieved
Solution Approach 1:
The patent creates a composite aqueous dispersion system combining multiple components: biocidal ingredients (IPBC and DCOIT), water, surfactants, and thickeners. This composite formulation achieves both high concentration and stability by synergistically combining materials that address each other's limitations - the surfactants prevent precipitation while the thickeners maintain suspension stability.
Solution Approach 2:
The patent introduces surfactants as intermediary substances that mediate between the hydrophobic biocidal ingredients and the aqueous environment. These surfactants form micelles or emulsions that solubilize the biocides in water, enabling high concentration stable dispersions. Thickeners serve as additional intermediaries to maintain physical stability and prevent settling.
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 provides a stable, concentrated, and evenly distributed biocidal effect with reduced particle size and VOC emissions, enhancing microbiological efficacy and safety in handling, while maintaining low melting points and stability against crystallization and agglomeration.
Implementation Method 1
low-melting mixtures of phenolic biocides which can be used to make aqueous dispersions
Implementation Method 2
from 10% to 20% of a combination of surfactants, fillers and thickeners
Implementation Method 3
stability against crystallization and agglomeration
Data Source
AI summary
A low-melting biocidal composition comprising 4,5-dichloro-2-octyl-3(2H)-isothiazolone, 3-iodopropargyl-N-butyl carbamate and at least one C1-C4 alkyl 4-hydroxybenzoate. The composition is stable with regard to agglomeration and crystallization at room temperature.