Zinc Carboxylate Polyurethane Foam Composition for Early Strength
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Solution Overview
Problem
Existing methods for producing polyurethane and polyisocyanurate foams do not effectively achieve high compression strength and indentation hardness while minimizing the impact on the rise profile, often using catalysts with toxicological concerns and processing issues.
Innovation Solution
A composition comprising a polyisocyanate component, a polyol component, zinc(II) carboxylate in stoichiometric form, a tertiary amine, and a nitrogen-containing modified phenol, which enhances trimerization and improves foam performance with minimal influence on the rise profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional catalysts are used to accelerate trimerization, then compression strength and indentation hardness improve, but toxicological concerns and processing issues arise
Solution Approach 1:
The patent changes the chemical parameters of the catalyst system by using zinc(II) carboxylates with specific carboxylic acid structures (aliphatic, alicyclic, or aromatic acids with 1-20 carbon atoms) instead of conventional toxic catalysts. This parameter change maintains effective trimerization catalysis while eliminating toxicological concerns, achieving both high compression strength and environmental safety.
Solution Approach 2:
The patent employs zinc carboxylates that can be easily removed or decomposed after serving their catalytic function. The carboxylate ligands are designed to be readily available, cost-effective, and environmentally benign, allowing the catalyst system to perform its function and then be discarded without harmful environmental impact, unlike persistent toxic catalysts.
2Strength
If catalysts are used to improve foam performance, then compression strength increases, but the rise profile is significantly impacted
Solution Approach 1:
The patent optimizes the molecular parameters of the carboxylic acid ligands (carbon chain length 1-20, aliphatic/alicyclic/aromatic types) to fine-tune the catalyst's activity and selectivity. This parameter optimization enables the catalyst to promote trimerization effectively while maintaining appropriate reaction rates that preserve the desired rise profile, avoiding both too-fast and too-slow reactions.
3Productivity
If zinc carboxylate in stoichiometric form is used, then trimerization is enhanced with minimal influence on rise profile, but precise stoichiometric control is required
Solution Approach 1:
The patent designs the zinc carboxylate catalyst system to self-regulate its stoichiometry through the inherent coordination chemistry of zinc with carboxylate ligands. The system naturally maintains the optimal Zn:carboxylate ratio through ligand exchange equilibria and coordination saturation, reducing the burden on external process control while maintaining high trimerization efficiency and minimal rise profile impact.
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 results in foams with high compression strength and indentation hardness at an early stage, reducing processing issues and enabling efficient production of high-quality insulation products with improved ecotoxicological properties.
Implementation Method 1
The formation of polyisocyanurates is advantageous, as they lead to good mechanical properties (high compression strength) and improved flame-retardant properties. Various publications regarding the use of catalysts to improve compression strength by supporting the trimerization reaction in the production of PU or PIR rigid foams are known.
Implementation Method 2
In the production of polyurethane or polyisocyanurate foams, preferably rigid polyurethane or polyisocyanurate foams, various catalysts can be used to positively influence the foaming reaction profile and the performance properties of the foam.
Implementation Method 3
For the purposes of the present invention, polyurethane foam (PU foam) is understood in particular to mean foam obtained as a reaction product based on polyisocyanates and polyols or compounds containing isocyanate-reactive groups.
Data Source
AI summary
The present invention relates to a composition for producing polyurethane or polyisocyanurate foam, comprising a polyisocyanate component, a polyol component, at least one tertiary amine of the formula (X), and at least one zinc(II) carboxylate, with the proviso that the zinc(II) carboxylate present is used in stoichiometric form, i.e. with Zn(II) and carboxylate in a molar ratio of 1 to 2, wherein the composition additionally contains at least one nitrogen-containing compound V which has at least two N atoms and which is a modified phenol.