Aqueous polyurethane resin dispersion and method for producing same, paint, film arrangement, and structure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing aqueous polyurethane resin dispersions face issues with high volatile component discharge and energy consumption in drying, and lack cold-resistant flexibility and softness, particularly when using polycarbonate polyol in urethane resin skeletons.
Innovation Solution
An aqueous polyurethane resin dispersion with a nonvolatile component content of 45% by mass or more, containing polyurethane resin particles with at least 10 mol % linear aliphatic isocyanate component of 4 to 10 carbon atoms and a volume-average particle size of 0.05 to 5 μm, along with optional short-chain diol and diamine components, is developed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an aqueous polyurethane resin dispersion is used to replace solvent-based urethane, then environmental safety and toxicity are improved, but the amount of volatile component discharge and energy consumption in drying increase due to high water content
Solution Approach 1:
The patent changes the concentration parameter of the aqueous polyurethane resin dispersion, specifically formulating it with 45% by mass or more nonvolatile component content. This parameter change reduces the water content from conventional high levels to a manageable amount, thereby reducing both volatile component discharge and energy consumption in the drying process while maintaining the environmental safety benefits of water-based formulations.
2Reliability
If polycarbonate polyol is used in urethane resin skeleton, then lightfastness is improved, but cold-resistant flexibility and softness deteriorate
Solution Approach 1:
The patent creates a composite polyol system by combining polycarbonate polyol (providing lightfastness) with polyether polyol (providing cold-resistant flexibility and softness). This composite material approach allows the urethane resin to simultaneously achieve excellent lightfastness from the polycarbonate component and superior cold flexibility from the polyether component, resolving the contradiction between these two properties.
3Reliability
If polycarbonate polyol is used in urethane resin skeleton, then lightfastness is improved, but softness deteriorates
Solution Approach 1:
The patent employs a composite polyol formulation combining polycarbonate polyol (for lightfastness) with polyether polyol (for softness). The polyether component contributes its inherent soft and flexible characteristics to the final urethane resin, thereby maintaining excellent softness while preserving the lightfastness benefits of polycarbonate polyol.
4Loss of energy
If nonvolatile component content is increased to reduce drying energy, then volatile component discharge is reduced, but formulation complexity increases
Solution Approach 1:
The patent applies parameter changes by optimizing the nonvolatile component content to 45% by mass or more, and by specifying the volume-average particle size of polyurethane resin particles within 0.05 to 5 μm. These precise parameter specifications enable the formulation to achieve reduced volatile discharge and energy consumption while maintaining manufacturability and performance, balancing the trade-off between energy efficiency and formulation complexity.
Data Source
AI summary
An aqueous polyurethane resin dispersion containing polyurethane resin particles dispersed in water, which contains a nonvolatile component in an amount of 45% by mass or more and in which the polyurethane resin particles contain a polyol component and an isocyanate component, at least 10 mol % or more of the isocyanate component is a linear aliphatic isocyanate component having 4 to 10 carbon atoms, and the volume-average particle size of the polyurethane resin particles is 0.05 to 5 μm.