Preparation of an insulating composite
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Solution Overview
Problem
Existing cross-linkable compositions for preparing composites with structuring or insulating properties often contain harmful compounds like urea-formaldehyde, formaldehyde, and phosphorus-based substances, which are environmentally problematic and require regulatory restrictions. Additionally, these compositions face challenges in controlling reaction kinetics and avoiding parasitic reactions or by-product formation during crosslinking.
Innovation Solution
A method for preparing a composite material using an aqueous composition that includes an α-sulphonated polymer, a sulfo-carboxylic acid, and a polyfunctional compound, all prepared without phosphorus compounds. This composition is applied to heat-resistant substrates and crosslinked at controlled temperatures and pH levels to produce a composite with improved structuring and insulating properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If phosphorus-based catalysts are used to accelerate ester or amide formation, then reaction kinetics are improved, but environmental harm and regulatory restrictions increase
Solution Approach 1:
The patent removes phosphorus-based catalysts from the composition entirely, extracting the harmful element while maintaining reaction effectiveness through alternative catalytic systems based on sulfur compounds and carboxylic acids
Solution Approach 2:
The patent introduces sulfur compounds (such as bisulfite ions) and carboxylic acids as intermediary catalysts that mediate the ester or amide formation reaction, replacing the harmful phosphorus-based catalysts while achieving comparable or improved reaction kinetics
2Object-affected harmful factors
If reaction temperature is increased to compensate for removing phosphorus catalyst, then catalyst removal is achieved, but degradation of reagents and products increases
Solution Approach 1:
The patent changes the chemical nature of the catalyst from phosphorus-based to sulfur-based compounds, allowing the reaction to proceed at lower temperatures without degradation, thus avoiding the formation of harmful by-products while achieving catalyst removal
3Productivity
If crosslinking reactivity is increased to improve manufacturing efficiency, then productivity increases, but parasitic reactions and by-product formation increase
Solution Approach 1:
The patent converts the potential harm of high reactivity into a benefit by using sulfur compounds and carboxylic acids that provide controlled, selective crosslinking reactivity, ensuring high manufacturing efficiency while minimizing parasitic reactions and by-product formation through specific chemical selectivity
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 method effectively produces composites with enhanced insulating and structuring properties while avoiding the use of environmentally harmful compounds. It achieves high reaction kinetics and controlled crosslinking, reducing by-product formation and improving the overall manufacturing efficiency.
Implementation Method 1
by a polymerisation reaction of at least one monomer M chosen among acrylic acid, methacrylic acid, an acrylic acid salt, a methacrylic acid salt and combinations thereof, in the presence of at least one initiator compound and of at least one sulphur compound comprising sulphur in oxidation state IV
Implementation Method 2
the crosslinking of material F impregnated with composition R
Data Source
AI summary
A method for preparing a composite material from mineral fibers, by impregnating and then crosslinking an aqueous composition. The method is particularly effective for obtaining a composite having structuring or insulating properties. The aqueous composition includes a polyfunctional compound combined with an alpha-sulfonated polymer and a sulfo-carboxylic acid.