Biomass Polyester Polyol Composition for Stable Polyurethane Reaction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional polyurethane resins derived from petroleum-based succinic acid suffer from instability in reaction control, high molecular weight, and restricted applications due to poor handling properties and inconsistent physical properties, while biopolyurethanes produced from biosuccinic acid lack practical usability due to uncontrolled malic acid content and coloration issues.
Innovation Solution
A method for producing biomass-resource-derived polyurethane by controlling the content of an organic acid with a pKa value ≤ 3.7 in the dicarboxylic acid, specifically using malic acid, tartaric acid, or citric acid, to achieve a hydroxyl number-calculated molecular weight between 500 and 4,000, resulting in a polyurethane with improved mechanical and elastic properties and reduced coloration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyester polyol is produced using petroleum-derived succinic acid, then the polyurethane has good handling properties and stable reaction control, but the environmental impact is high and the applications are restricted
Solution Approach 1:
The invention changes the chemical composition parameters of the dicarboxylic acid by incorporating biomass-derived components (succinic acid, malic acid, tartaric acid, citric acid) in specific proportions. This parameter change enables the polyurethane to maintain stable reaction control while achieving environmental friendliness through biomass resource utilization.
Solution Approach 2:
The invention uses a composite dicarboxylic acid system combining multiple acids (succinic acid 5-50 wt%, malic acid 1-30 wt%, tartaric acid 1-20 wt%, citric acid 1-20 wt%) derived from biomass. This composite approach allows the polyurethane to exhibit both environmental friendliness and practical usability with stable handling properties.
2Object-affected harmful factors
If polyester polyol is produced using biosuccinic acid with uncontrolled malic acid content, then the polyurethane is environmentally friendly, but the coloration is poor and practical usability is limited
Solution Approach 1:
The invention precisely controls the content parameters of organic acids in the dicarboxylic acid mixture, specifically limiting malic acid to 1-30 wt% and adding tartaric acid (1-20 wt%) and citric acid (1-20 wt%). This parameter control suppresses coloration while maintaining environmental friendliness through biomass derivation.
Solution Approach 2:
The invention introduces tartaric acid and citric acid as intermediary substances that mediate between the coloration-causing malic acid and the desired polyurethane properties. These intermediaries help control the molecular structure and prevent excessive coloration while preserving the environmental benefits of biomass-derived acids.
3Strength
If the molecular weight of polyester polyol is increased to improve mechanical strength, then the polyurethane has higher strength, but the handling properties deteriorate
Solution Approach 1:
The invention optimizes the molecular weight parameter of polyester polyol to a specific range (500-4,000 g/mol) and controls the hydroxyl number accordingly. This parameter optimization achieves a balance where the polyurethane attains sufficient mechanical strength while maintaining good handling properties for practical applications.
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 method produces polyurethanes with enhanced flexibility, mechanical strength, and handling properties, suitable for various applications including artificial leathers, shoe soles, and coatings, while being environmentally friendly and biodegradable.
Implementation Method 1
reacting a dicarboxylic acid and an aliphatic diol to produce a polyester polyol
Implementation Method 2
reacting the polyester polyol and a polyisocyanate compound
Data Source
AI summary
A novel polyester polyol for obtaining an environmentally friendly polyurethane, which is easily controllable in polyurethane reaction and has excellent elasticity and elastic modulus in polyurethane, while maintaining heat resistance, weather resistance, and water resistance as characteristics of a polyurethane derived from a polyester polyol; and a polyurethane using this novel polyester polyol, are provided. The invention relates to a method for producing a biomass-resource-derived polyurethane, which comprises: reacting a dicarboxylic acid and an aliphatic diol to produce a polyester polyol; and reacting the polyester polyol and a polyisocyanate compound, wherein the dicarboxylic acid contains at least one component derived from biomass resources, a content of an organic acid in the dicarboxylic acid is more than 0 ppm and not more than 1,000 ppm relative to the dicarboxylic acid, and a pKa value of the organic acid at 25°C is not more than 3.7.