Lignin Polyurethane Co-polymerization Solubility
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Solution Overview
Problem
The incorporation of technical lignin into polymeric materials is limited by its poor solubility in organic solvents and compatibility issues, which affect the material properties of lignin-based polyurethanes, hindering their application in high-performance products.
Innovation Solution
The method involves co-polymerizing organosolv lignin with monomeric polyols and isocyanates, using secondary hydroxyl providers like aliphatic diols and polyethers to enhance the dispersion and solubility of lignin in polyurethane networks, thereby improving mechanical and thermal properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If technical lignin is incorporated into polymeric materials, then sustainable replacement for petrochemical polyols is achieved, but poor solubility and compatibility issues limit the amount of lignin that can be incorporated
Solution Approach 1:
The patent changes the molecular weight parameter of lignin by using organosolv lignin with controlled molecular weight (Mn of 1000-5000 g/mol) to improve solubility in organic solvents while maintaining sustainable properties. This parameter modification allows higher lignin incorporation without sacrificing sustainability.
Solution Approach 2:
The patent introduces secondary hydroxyl providers as intermediary components that mediate between lignin and the polyurethane network. These intermediaries improve compatibility and dispersion of lignin, enabling higher incorporation levels by facilitating better interaction between lignin molecules and the polymer matrix.
2Ease of manufacture
If heterogeneity of native lignin structure is increased during pulping or pretreatment, then technical lignin is produced, but material properties deteriorate as lignin incorporation increases
Solution Approach 1:
The patent modifies the molecular weight distribution parameter by selecting organosolv lignin with controlled Mn (1000-5000 g/mol) to balance ease of manufacture with improved material properties. This controlled parameter change reduces excessive heterogeneity while maintaining production efficiency.
Solution Approach 2:
The patent applies local quality by using secondary hydroxyl providers at specific locations within the polyurethane network to locally improve compatibility and dispersion. This targeted approach enhances material properties in regions where lignin incorporation is highest without compromising overall production ease.
3Strength
If high-molecular-weight lignin cuts are used, then material properties of lignin-based polymers are improved, but undesirable dispersion and compatibility issues occur in the material matrix
Solution Approach 1:
The patent optimizes the molecular weight parameter by selecting organosolv lignin with Mn in the range of 1000-5000 g/mol, which is lower than high-molecular-weight lignin cuts. This parameter adjustment improves dispersion and compatibility while maintaining sufficient material properties through the balanced molecular weight range.
Solution Approach 2:
The patent introduces secondary hydroxyl providers as intermediary components that enhance the dispersion and compatibility of lignin in the polyurethane matrix. These intermediaries act as bridges between high-molecular-weight lignin structures and the polymer network, improving stability of composition.
4Stability of the object's composition
If low-molecular-weight lignin cuts are used to improve solubility, then dispersion and compatibility are enhanced, but material properties are reduced
Solution Approach 1:
The patent optimizes the molecular weight parameter by selecting organosolv lignin with Mn in the range of 1000-5000 g/mol, which is higher than very low-molecular-weight cuts. This parameter adjustment maintains good solubility and dispersion while preserving sufficient material properties through the balanced molecular weight range.
Solution Approach 2:
The patent creates a composite system by combining organosolv lignin with secondary hydroxyl providers and monomeric polyols. This composite approach allows the lignin component to provide solubility and dispersion benefits while the combined system maintains enhanced material properties through synergistic interactions.
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
This approach results in polyurethanes with enhanced tensile strength, elongation at break, and thermal stability, enabling the effective utilization of lignin in value-added products such as coatings and adhesives.
Implementation Method 1
co-polymerizing: an organosolv lignin; a monomeric polyol; and an isocyanate; to provide a polyurethane
Implementation Method 2
using secondary hydroxyl providers like aliphatic diols and polyethers to enhance the dispersion and solubility of lignin in polyurethane networks
Implementation Method 3
enhance the dispersion and solubility of lignin in polyurethane networks
Data Source
AI summary
The invention provides a method of production of biogenic lignin-based polyurethane having soft-segments from the co-polymerization of an organosolv lignin or other low molecular weight lignin and a monomeric polyol. The invention also provides polyurethanes having unique and beneficial properties.