Biocidal Microcapsules with Melamine-Formaldehyde Shell
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Solution Overview
Problem
Existing microcapsules used for protecting coating compositions against fungal attack suffer from high leaching rates and inadequate storage stability, leading to reduced fungicidal effectiveness and environmental concerns due to the washout of biocides like IPBC when exposed to water.
Innovation Solution
Microcapsules are developed comprising iodopropargyl compounds encapsulated with a melamine-formaldehyde polymer, which are produced through a process involving application of the melamine-formaldehyde polymer to the iodopropargyl compounds at specific temperatures and pH levels, resulting in a reduced leaching rate and enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fungicides such as IPBC are used in coating compositions to protect against fungal attack, then the fungicidal effectiveness is improved, but the leaching rate increases when the coating contacts water
Solution Approach 1:
The coating composition is segmented into multiple functional components: hydrophobic biocides (IPBC, IPC) for fungal protection, hydrophilic binders for adhesion, and hydrophobic modifiers (silane-modified polyesters) to reduce overall water absorption. This segmentation allows the coating to maintain fungicidal effectiveness while reducing leaching through optimized component interactions
Solution Approach 2:
The invention uses composite material systems combining hydrophobic biocides with hydrophilic binders and hydrophobic modifiers. The silane-modified polyesters and other hydrophobic additives create a composite matrix that reduces water penetration while maintaining biocide effectiveness, thereby reducing leaching without sacrificing fungicidal protection
2Reliability
If the concentration of biocides is increased to maintain effectiveness against leaching, then the fungicidal protection is improved, but the environmental burden increases
Solution Approach 1:
The invention changes the physical-chemical parameters of the coating system by incorporating hydrophobic modifiers that alter water interaction. This parameter change reduces the driving force for biocide leaching, allowing effective protection at lower biocide concentrations, thereby reducing environmental burden while maintaining reliability
3Stability of the object's composition
If hydrophilic binders are used to ensure coating stability and adhesion, then the coating performance is improved, but the water absorption increases leading to higher biocide leaching
Solution Approach 1:
The coating formulation applies local quality differentiation by using hydrophilic binders in specific regions where adhesion is needed, while incorporating hydrophobic modifiers and biocides in regions where water resistance and fungicidal protection are prioritized. This spatial differentiation of properties allows the coating to achieve both stability and reduced leaching
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 microcapsules exhibit a significantly reduced leaching rate, allowing for prolonged protection against fungal attacks with smaller quantitative amounts, thereby extending the action time and improving environmental sustainability.
Implementation Method 1
the at least one iodopropargyl compound is microencapsulated with a microencapsulation material which comprises at least one melamine-formaldehyde polymer
Data Source
AI summary
The present invention relates to microcapsules comprising one or more biocides such as, in particular, iodopropargyl compounds, and at least one melamine-formaldehyde polymer, to a process for producing such microcapsules, and to their use for protecting technical materials.