Carbonate group-containing polyol, polyurethane resin composition, artificial leather, and leather-like sheet
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Polycarbonate polyol has high viscosity, making it difficult to handle and requiring large amounts of solvent in polyurethane production, which limits its application in coatings and adhesives, and existing polyurethane resins lack sufficient low-temperature flexibility and moist heat resistance.
Innovation Solution
A carbonate group-containing polyol with a specific molecular structure, comprising constituent units (A), (B), and (C), is developed, which has a lower viscosity and improved handleability, allowing for reduced solvent use and enhanced low-temperature flexibility and moist heat resistance in polyurethane resins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polycarbonate polyol is used alone to produce polyurethane, then durability such as heat resistance and hydrolysis resistance is improved, but viscosity becomes excessively high making handling difficult and requiring large amounts of solvent
Solution Approach 1:
The patent applies composite materials by combining polycarbonate polyol with other polyols (such as polyether polyol or polyester polyol) to create a blended polyol composition. This composite approach maintains the durability benefits of polycarbonate polyol while reducing its viscosity through the properties of the other polyol components, thereby improving handleability without sacrificing performance
Solution Approach 2:
The patent applies parameter changes by adjusting the molecular weight, hydroxyl value, and compositional ratios of the polyol blend. By optimizing these parameters, the viscosity is reduced to acceptable levels while maintaining the durability characteristics provided by the polycarbonate polyol component
2Reliability
If polycarbonate polyol is used alone to produce polyurethane, then durability such as heat resistance and hydrolysis resistance is improved, but the amount of solvent required increases significantly
Solution Approach 1:
By blending polycarbonate polyol with other polyols to create a composite polyol system, the viscosity is reduced allowing for lower solvent content in the final polyurethane formulation. This maintains durability while reducing the quantity of solvent required
Solution Approach 2:
By optimizing the molecular weight and hydroxyl value parameters of the blended polyol, the formulation achieves appropriate viscosity without requiring excessive solvent, thereby reducing the total solvent amount while preserving durability
3Adaptability or versatility
If existing polyurethane resins are used, then general performance is maintained, but low-temperature flexibility and moist heat resistance are insufficient
Solution Approach 1:
The patent uses composite materials by blending polycarbonate polyol (which provides moist heat resistance) with other polyols (which provide low-temperature flexibility). This composite approach achieves both low-temperature flexibility and moist heat resistance simultaneously, overcoming the limitations of conventional single-polyol systems
Data Source
AI summary
Provided is a carbonate group-containing polyol that has low viscosity and excellent handleability which lead to reduction in the amount of a solvent used at the time of coating material or polyurethane production, by decreasing the viscosity of polyol itself, and in addition, can produce polyurethane excellent in low-temperature flexibility and moist heat resistance. The present invention provides a carbonate group-containing polyol having a number-average molecular weight of 300 to 10000, and having a predetermined constituent unit (A), a predetermined constituent unit (B), and a predetermined constituent unit (C), wherein a content of the constituent unit (A) is 20 to 80% by mass based on the total mass of the constituent units (A), (B), and (C).