Amine Catalyst for Polyurethane Reducing VOC Emissions
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Solution Overview
Problem
Conventional amines used as catalysts in polyurethane reactions often emit volatile organic compounds (VOCs) and odorous species, leading to issues like fogging and adverse health effects due to their volatility and reactivity.
Innovation Solution
Development of specific amines with the formula (CH3)2NCH2CH2OCH2CH2N(R1)(R2), where R1 and R2 can be various alkyl or hydroxyl groups, which act as catalysts in polyurethane reactions, reducing VOC emissions and odor by increasing molecular weight and lowering vapor pressure, thereby minimizing bonding within the polyurethane product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional amines are used as catalysts in polyurethane reactions, then the catalytic activity is sufficient, but VOC emissions and odorous species increase
Solution Approach 1:
The patent changes the molecular weight parameter of the amine catalyst by introducing longer alkyl chains (n=0-5) and hydroxyl groups (m=2-4) in the general formula (CH3)2NCH2CH2OCH2CH2N(R1)(R2). This parameter change increases molecular weight while maintaining catalytic activity, thereby reducing volatility and VOC emissions.
Solution Approach 2:
The patent creates composite amine structures by combining dimethylamino groups with various alkyl and hydroxyl substituents in a specific molecular architecture. This composite structure achieves both sufficient catalytic activity and reduced volatility by distributing functional groups across a larger molecular framework.
2Object-generated harmful factors
If amine molecular weight is increased to reduce volatility, then VOC emissions decrease, but catalytic efficiency may be reduced
Solution Approach 1:
The patent applies local quality by concentrating the catalytically active dimethylamino groups at specific locations in the molecular structure while extending the alkyl chains and adding hydroxyl groups at other positions. This spatial distribution maintains local catalytic activity while the overall molecular size reduces volatility.
Solution Approach 2:
The patent introduces dynamic flexibility through alkyl chains of variable length (n=0-5) and hydroxyl groups (m=2-4), allowing the molecular structure to adapt its conformation. This dynamic structure maintains catalytic effectiveness while the increased molecular weight and reduced flexibility overall decrease volatility.
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 new amines effectively catalyze polyurethane reactions, reducing VOC emissions and offensive odors, as they are either reactive and bond within the product or non-reactive but still reduce volatility, outperforming conventional catalysts in terms of reduced vapor pressure and odor impact.
Implementation Method 1
Amines are well known as catalysts in the reaction of isocyanates with isocyanate reactive groups
Implementation Method 2
reducing VOC emissions and odor by increasing molecular weight and lowering vapor pressure
Data Source
AI summary
An amine according to the invention has a formula (CH3)2NCH2CH2OCH2CH2CH2N(R1)(R2) wherein R1 is selected from (CH3)2NCH2CH2OCH2CH2CH2- and R2 is selected from the group consisting of H-, CH3(CnH2n)-,HO(CmH2m)- and (CH3)2NCH2CH2OCH2CH2CH2-, n being an integer in the range of 0 to 5, m being an integer in the range of 2 to 4.