Bioapplication Polyurethane Preparation Without Carcinogenic Byproducts
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Solution Overview
Problem
Existing polyurethane preparation processes involve environmental pollutants and carcinogens like N-nitroso-N-methyl-N-phenylamine derivatives, limiting their bioapplication, particularly for skin-related products.
Innovation Solution
A method involving the dissolution, cooling, and reaction of specific polyester polyols and isocyanates to produce a polyurethane free of N-nitroso-N-methyl-N-phenylamine derivatives, using a 2-liter double-jacketed glass reactor with controlled temperature and stirring, employing extenders and isocyanates like isophorone diisocyanate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polyurethane preparation using polyester polyol and isocyanate is used, then polyurethane can be produced with excellent physical properties, but the process generates environmental pollutants and carcinogens like N-nitroso-N-methyl-N-phenylamine derivatives
Solution Approach 1:
The patent changes the chemical parameters of the polyol component by using hydrogenated polyester polyol instead of conventional polyester polyol, and controls the reaction parameters (temperature, time, molar ratio) to prevent formation of harmful N-nitroso compounds. This modifies the chemical composition and reaction conditions to eliminate carcinogens while maintaining polyurethane performance.
Solution Approach 2:
The patent converts the potentially harmful conventional polyol into a safe hydrogenated polyester polyol through hydrogenation treatment. This process eliminates the harmful aromatic rings and nitroso groups that cause carcinogenicity, transforming a harmful material into a safe one while maintaining the desired polyurethane properties.
2Adaptability or versatility
If conventional polyurethane preparation is used, then the production process is simple, but the polyurethane contains carcinogens that limit bioapplication
Solution Approach 1:
The patent modifies the chemical parameters of the polyol by using hydrogenated polyester polyol with specific molecular weight ranges (1000-10000) and controls reaction parameters (temperature 70-90°C, time 60-180 minutes, molar ratio 1:1 to 1:1.5) to produce polyurethane free of carcinogens, enabling safe bioapplication.
3Reliability
If hydrogenated polyester polyol is used instead of conventional polyester polyol, then carcinogen content is reduced, but the production process becomes more complex
Solution Approach 1:
The patent performs hydrogenation treatment on the polyester polyol before the main polyurethane synthesis reaction. This preliminary action eliminates harmful aromatic rings and nitroso groups in advance, ensuring that the subsequent polyurethane formation process does not generate carcinogens, while the overall process remains straightforward.
4Productivity
If the reaction temperature is increased to improve reaction rate, then productivity increases, but the formation of harmful by-products may increase
Solution Approach 1:
The patent optimizes the reaction temperature parameter to 70-90°C, which is sufficient to achieve good reaction rate while preventing the formation of harmful N-nitroso by-products. This optimized temperature range balances productivity with safety, avoiding the need for excessively high temperatures that would generate harmful by-products.
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 a polyurethane suitable for bioapplication without carcinogens, applicable to products like bandages and dressings, ensuring skin safety.
Implementation Method 1
dissolving a mixture of a polyester polyol and an extender in a reactor by heating to obtain a dissolved product
Implementation Method 2
cooling the dissolved product to obtain a cooled product
Implementation Method 3
reacting a mixture of the cooled product and an isocyanate
Data Source
AI summary
A method of preparing a polyurethane for bioapplication, the method including dissolving a mixture of a polyester polyol and an extender in a reactor by heating to obtain a dissolved product, cooling the dissolved product to obtain a cooled product, and reacting a mixture of the cooled product and an isocyanate is disclosed.