Copper Catalyst Composition for Low VOC Polyurethane Foams
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Solution Overview
Problem
The polyurethane foam industry faces challenges in developing efficient, non-toxic catalysts for polyurethane foam production that reduce volatile organic compound emissions and improve physical properties such as firmness and load-bearing capacity, while also simplifying the manufacturing process and reducing environmental impact.
Innovation Solution
A composition comprising a tertiary amino compound and a copper(II)-compound, specifically Cu(II)-carboxylates or their hydrates, is used as a catalyst, which forms a homogeneous liquid at room temperature and maintains unbound tertiary amino compounds, facilitating the formation of polyurethane foams with improved properties and low emission profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If organotin compounds are used as catalysts to promote gel reaction, then catalytic activity is improved, but environmental toxicity and worker exposure risks worsen
Solution Approach 1:
The patent replaces persistent organotin catalysts with copper-based catalysts that can be used in small amounts and do not accumulate in the environment. The copper catalyst system achieves comparable catalytic activity without the long-term environmental persistence and toxicity of organotin compounds, effectively substituting a harmful substance with a more environmentally benign alternative.
Solution Approach 2:
The patent changes the chemical composition parameter from organotin compounds to copper-based catalysts combined with specific ligands (such as amino acids or nitrogen-containing compounds). This parameter change maintains catalytic functionality while eliminating the toxicological properties associated with organotin, thereby resolving the contradiction between catalytic activity and environmental safety.
2Object-generated harmful factors
If reactive amines are used to reduce VOC emissions by linking to polymer network, then emission levels are reduced, but fatigue properties and compression set worsen
Solution Approach 1:
The patent uses copper catalysts with specific ligands that have low vapor pressure and do not require covalent bonding to the polymer network to achieve low emissions. The catalyst system achieves effective VOC reduction through its inherent low volatility rather than through chemical bonding, thereby avoiding the degradation of fatigue properties and compression set that occurs with reactive amine catalysts.
Solution Approach 2:
The patent introduces copper ions complexed with ligands (such as amino acids or nitrogen-containing compounds) as an intermediary catalyst system. This mediator achieves low VOC emissions through its stable complex structure and low volatility, while not participating in chain termination reactions, thus preserving the fatigue properties and mechanical performance of the polyurethane foam.
3Object-generated harmful factors
If monofunctional reactive amines are used as catalysts, then VOC emissions are reduced through covalent bonding, but chain termination during polymer growth increases
Solution Approach 1:
The patent employs copper-based catalysts with ligands that achieve low VOC emissions without requiring covalent bonding to the growing polymer chain. The catalyst remains as a discrete molecular complex throughout the reaction, avoiding chain termination and allowing continuous polymer growth, thereby maintaining high productivity while achieving low emissions.
Solution Approach 2:
The copper-ligand complex acts as an intermediary catalyst that mediates the polymerization reaction without becoming part of the polymer chain. This intermediary system provides low VOC emissions through its stable structure and low volatility, while simultaneously maintaining polymer growth efficiency by not causing chain termination, thus resolving the contradiction between emission reduction and productivity.
4Productivity
If polydentate ligands are used to create copper complexes, then catalytic performance is improved, but manufacturing complexity worsens
Solution Approach 1:
The patent replaces complex polydentate ligand systems with simpler ligand molecules (such as amino acids or small nitrogen-containing compounds) that form effective copper complexes. These simpler ligands reduce manufacturing complexity by eliminating the need for multi-step ligand synthesis while maintaining catalytic performance through efficient copper coordination.
Solution Approach 2:
The patent changes the ligand structure parameter from complex polydentate ligands requiring multiple synthesis steps to simpler ligands with fewer functional groups. This parameter change simplifies the manufacturing process while maintaining or improving catalytic performance through optimized copper-ligand coordination geometry and electronic properties.
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 catalyst composition significantly enhances curing degrees and physical properties of polyurethane foams, reduces VOC emissions, and simplifies the manufacturing process by using inexpensive and easily prepared components, addressing the need for efficient and environmentally friendly catalysts.
Implementation Method 1
A composition comprising a tertiary amino compound and a copper(II)-compound, specifically Cu(II)-carboxylates or their hydrates, is used as a catalyst, which forms a homogeneous liquid at room temperature
Implementation Method 2
Two major reactions are promoted by the catalysts among the reactants during the preparation of polyurethane foam, gelling and blowing. Development of efficient gelling catalysts exhibiting high catalytic activity beneficially enables a decrease of curing times required for polyurethane foams
Data Source
AI summary
The present invention relates to a composition comprising at least one tertiary amino compound (A), and at least one copper(II)-compound (B), a process for the manufacture of said composition, the use of said composition as a catalyst, in particular, as catalyst for the reaction of at least one isocyanate compound with at least one isocyanate-reactive compound, in particular for the manufacture of polyisocyanate polyaddition products, such as polyurethanes, in particular, polyurethane foams.