Polythiol Composition Catalysis for Low-Temperature Thiourethane Recycling
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Solution Overview
Problem
Existing methods for producing polythiol compositions from thiourethane resin waste require high-temperature reactions, leading to high energy consumption and the generation of by-products, with a need for a more efficient low-temperature reaction system.
Innovation Solution
A method involving the reaction of thiourethane resin with a quaternary ammonium salt and optional components like alcohol in a wide-temperature range (15°C to 110°C) to produce a polythiol composition, followed by mixing with a polyisocyanate compound to form a polymerizable composition and curing it to create a resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-temperature reaction is used to produce polythiol composition from thiourethane resin, then the reaction efficiency is improved, but energy consumption increases and by-products are generated
Solution Approach 1:
The invention changes the reaction temperature parameter from conventional high-temperature (requiring heating) to low-temperature (15°C to 110°C) by selecting specific quaternary ammonium salts as catalysts. This parameter change enables the reaction to proceed efficiently at lower temperatures, thereby reducing energy consumption while maintaining productivity.
Solution Approach 2:
The quaternary ammonium salt acts as an intermediary catalyst that facilitates the reaction between thiourethane resin and water or alcohol at low temperatures. The catalyst mediates the reaction process, enabling efficient polythiol composition production without requiring high-temperature conditions, thus resolving the contradiction between reaction efficiency and energy consumption.
2Speed
If high-temperature reaction is used to produce polythiol composition, then the reaction rate is improved, but by-product generation increases
Solution Approach 1:
By changing the reaction temperature parameter to a low-temperature range (15°C to 110°C) and using quaternary ammonium salts as catalysts, the invention achieves a fast reaction rate without the side effects of high-temperature reactions. This parameter optimization maintains high reaction speed while suppressing by-product formation through controlled low-temperature chemistry.
Solution Approach 2:
The quaternary ammonium salt serves as a selective intermediary catalyst that accelerates the desired reaction pathway at low temperatures while preventing alternative reaction pathways that would generate by-products. The catalyst's specific chemical properties enable rate enhancement without compromising reaction selectivity, thus reducing harmful by-product generation.
3Ease of manufacture
If conventional polythiol production method is used, then the reaction can proceed, but the process requires high energy input and produces waste
Solution Approach 1:
The invention modifies the reaction parameters by using quaternary ammonium salts to enable the reaction to proceed at low temperatures (15°C to 110°C), dramatically reducing energy input requirements. This parameter change maintains process feasibility and ease of manufacture while minimizing energy waste, making the production process more sustainable and cost-effective.
Solution Approach 2:
The invention converts the previously harmful high-temperature requirement into a benefit by using quaternary ammonium salt catalysts that enable low-temperature reaction. This transformation turns what was previously a harmful energy-intensive process into an energy-efficient process, reducing energy waste while maintaining manufacturing feasibility.
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
This method enables the production of polythiol compositions and resins in a more energy-efficient and environmentally friendly manner by utilizing low-temperature reactions, reducing waste and by-product generation.
Implementation Method 1
a reaction step of reacting a thiourethane resin and a quaternary ammonium salt composed of a quaternary ammonium cation and a counter anion to generate a polythiol composition
Data Source
AI summary
A method for producing a polythiol composition, including a reaction step of reacting a thiourethane resin and a quaternary ammonium salt comprising a quaternary ammonium cation and a counter anion to produce a polythiol composition.