Continuous Polyurea Particle Synthesis via Monoamine Modification
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Solution Overview
Problem
Existing methods for producing polyurea particles are not cost-efficient and are typically performed in batch mode, limiting scalability and efficiency.
Innovation Solution
A continuous process involving the reaction of a polyisocyanate component, a polyamine component, and an isocyanate-reactive monoamine in specific solvent mediums to produce polyurea particles with controlled size and high thermal stability, minimizing energy input and avoiding urethane bonds for enhanced properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If batch mode processing is used for producing polyurea particles, then process flexibility is maintained, but productivity and cost-efficiency deteriorate
Solution Approach 1:
The patent transforms the batch-wise discontinuous process into a continuous process where polyisocyanate, polyamine, and monoamine components are continuously fed through metering pumps into a reaction chamber, enabling uninterrupted particle production. This continuous operation eliminates idle time between batches and significantly increases productivity while maintaining process control through standardized feed ratios and continuous mixing.
2Manufacturing precision
If multiple discrete reaction steps are performed, then particle formation control is achieved, but manufacturing complexity and time consumption increase
Solution Approach 1:
The patent merges the traditionally separate polyurethane formation step and polyurea formation step into a single continuous reaction chamber. Both reactions occur simultaneously with continuous mixing, eliminating the time required for sequential batch processing while maintaining particle size control through optimized component feed rates and residence time in the reaction chamber.
Solution Approach 2:
The continuous reaction process eliminates idle time between discrete steps. Components are continuously mixed and reacted in one uninterrupted flow, transforming the multi-step batch process into a single continuous operation that reduces total processing time while maintaining manufacturing precision through controlled feed rates and mixing parameters.
3Stability of the object's composition
If large amounts of solvent are used and evaporated, then particle dispersion is achieved, but energy consumption and production costs increase
Solution Approach 1:
The patent extracts and eliminates the energy-intensive solvent evaporation step from the process. By using water-soluble or alcohol-soluble components that form stable dispersions without requiring large amounts of organic solvent, the process removes the need for high-energy evaporation while maintaining particle dispersion stability through aqueous or alcoholic media that require minimal or no thermal processing.
Solution Approach 2:
The patent changes the solvent system from organic solvents requiring evaporation to water or alcohol-based systems that form stable dispersions at ambient or mild temperatures. This parameter change in the solvent type eliminates the need for high-energy evaporation processes while maintaining particle stability through the selected solvent's ability to sustain dispersion without thermal intervention.
4Temperature
If polyurethane bonds are formed in the particle structure, then particle formation is facilitated, but thermal stability and hardness deteriorate
Solution Approach 1:
The patent changes the chemical composition parameter by using polyisocyanate + polyamine + monoamine components that directly form polyurea bonds without intermediate polyurethane formation. This compositional parameter change results in particles with superior thermal stability and hardness because polyurea bonds provide higher thermal resistance and mechanical strength compared to polyurethane bonds, achieving both improved thermal stability and enhanced hardness simultaneously.
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 enables the production of cost-efficient, thermally stable polyurea particles with narrow size distributions, maintaining stability over time and offering high hardness across a wide temperature range, suitable for applications like reinforcing fillers.
Implementation Method 1
reacting the polyisocyanate component, the polyamine component and the monoamine, by combining the polyisocyanate component dissolved in the first solvent, the polyamine component dissolved in the second solvent and the monoamine optionally dissolved in the third solvent, thereby providing urea particles dispersed in a solvent medium
Data Source
AI summary
A method for providing urea particles in a solvent medium, said method comprising at least the steps of:providing at least one polyisocyanate component dissolved in a first solvent;providing at least one isocyanate-reactive polyamine component dissolved in a second solvent;providing at least one isocyanate-reactive monoamine, optionally dissolved in a third solvent;combining and reacting said isocyanate-reactive monoamine optionally dissolved in said third solvent with said polyisocyanate dissolved in said first solvent, thereby providing an urea-modified polyisocyanate dissolved in said first solvent and said optionally third solvent, and thencombining and reacting said urea-modified polyisocyanate dissolved in said first solvent and said optionally third solvent with said polyamine component dissolved in said second solvent.