Anhydrosugar Polyol Composition for Polyurethane Chain Extenders
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Solution Overview
Problem
Conventional polyol compositions derived from dehydration reactions of hydrogenated sugars, when used as chain extenders for polyurethane, result in poor physical properties such as tensile strength and elongation ratio.
Innovation Solution
A polyol composition comprising monoanhydrosugar alcohol, dianhydrosugar alcohol, and their polymer, with specific molecular weight, polydispersity index, and hydroxyl value ranges, is developed to enhance the physical properties of polyurethane when used as a chain extender.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional polyol compositions are used as chain extenders for polyurethane, then the polyurethane can be produced, but the physical properties such as tensile strength and elongation ratio become poor
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molecular weight (Mn: 160-445 g/mol), polydispersity index (PDI: 1.25-3.15), and hydroxyl value (645-900 mgKOH/g) of the polyol composition. These parameter optimizations resolve the contradiction by enabling the polyol to serve as an effective chain extender that improves both tensile strength and elongation ratio of polyurethane, transforming a previously poor-performance system into one with excellent physical properties
2Ease of manufacture
If byproduct from dehydration reaction is used simply as binder, then the production process is simple, but the economic value and resource utilization are low
Solution Approach 1:
The patent converts the previously worthless or low-value byproduct of dehydration reaction into a high-value polyol composition suitable for polyurethane production. By applying dehydration reaction followed by distillation under reduced pressure, the process transforms waste material into a valuable chain extender, simultaneously maintaining production simplicity while dramatically increasing economic value and resource utilization
3Strength
If polyol composition with optimized molecular weight and hydroxyl value is used as chain extender, then the tensile strength and elongation ratio of polyurethane are improved, but the production process becomes more complex
Solution Approach 1:
The patent applies preliminary action by pre-optimizing the polyol composition through controlled dehydration reaction and distillation under reduced pressure before using it as a chain extender. This preliminary preparation ensures that the polyol has the exact molecular weight (Mn: 160-445 g/mol), polydispersity index (PDI: 1.25-3.15), and hydroxyl value (645-900 mgKOH/g) needed to achieve excellent tensile strength and elongation ratio in polyurethane, while the optimized process design keeps the overall complexity manageable
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 composition significantly improves the tensile strength and elongation ratio of polyurethane, offering improved economic and environmental benefits by utilizing byproducts from the dehydration reaction of hydrogenated sugars.
Implementation Method 1
preparation of anhydrosugar alcohol by dehydration reaction of hydrogenated sugar
Implementation Method 2
it can increase the glass transition temperature of polymer materials like polyester, PET, polycarbonate, polyurethane, epoxy resin, etc.
Data Source
AI summary
The present invention relates to a polyol composition comprising anhydrosugar alcohols and an anhydrosugar alcohol polymer and, more specifically, to a polyol composition comprising a monoanhydrosugar alcohol, a dianhydrosugar alcohol, and a polymer of a monoanhydrosugar alcohol and/or a dianhydrosugar alcohol, the polyol composition being usable in various fields since the physical property conditions of the composition, such as number average molecular weight (Mn), polydispersity index (PDI) and hydroxyl value, satisfy specific levels, and, particularly, being capable of remarkably improving the physical properties of a polyurethane, such as tensile strength and elongation, when used as a polyurethane chain extender.