Surface Crosslinking Polymer Particles for Thermal Stability
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Solution Overview
Problem
Polymer powders used in composite materials and cosmetics face limitations due to low melting points, leading to coalescence and irreversible deformation during high-temperature processing, which compromises mechanical and chemical properties.
Innovation Solution
A process for surface crosslinking polymer particles with labile-hydrogen functions using a crosslinking agent at a temperature below the polymer's melting point, creating partially crosslinked particles with improved heat resistance and moisture uptake, while preserving particle size and porosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If polymer powders are used in composite materials and cosmetics, then they provide impact reinforcement, filler properties, and cosmetic benefits, but they exhibit low melting point leading to coalescence and irreversible deformation during high-temperature processing
Solution Approach 1:
The patent applies surface crosslinking to create a composite structure where the polymer particle core maintains its original properties while the crosslinked surface layer provides thermal stability. This composite approach allows the particle to resist coalescence at high temperatures while preserving the base polymer's functional properties for use in composites and cosmetics
Solution Approach 2:
The patent changes the chemical parameter of the polymer surface by introducing crosslinks through reaction with crosslinking agents. This parameter change increases the melting point and thermal stability of the particle surface, preventing coalescence during high-temperature processing while maintaining the bulk polymer's desirable properties
2Temperature
If the melting point of polymer powders is increased through crosslinking, then heat resistance is improved, but the complexity of the manufacturing process increases
Solution Approach 1:
The crosslinking process is incorporated into the polymerization step itself, performing the heat resistance enhancement action beforehand rather than as a separate subsequent step. This preliminary action simplifies the overall manufacturing process by combining two operations into one
Solution Approach 2:
The patent merges the polymerization process with the crosslinking process into a single integrated operation. By adding the crosslinking agent during polymerization and allowing both reactions to occur simultaneously or sequentially in one step, the manufacturing complexity is reduced despite achieving enhanced heat resistance
3Stability of the object's composition
If surface crosslinking is performed to prevent coalescence, then thermal stability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent carefully controls and optimizes the parameters of the crosslinking process, including the type and amount of crosslinking agent, temperature, and reaction time. By precisely adjusting these parameters, the process achieves sufficient surface crosslinking to prevent coalescence while avoiding excessive crosslinking that would complicate manufacturing control
Solution Approach 2:
The patent employs partial crosslinking rather than complete crosslinking of the polymer particles. Only the surface layer is crosslinked to the extent necessary to provide thermal stability and prevent coalescence, while the core remains uncrosslinked or lightly crosslinked. This partial action reduces the precision requirements compared to full crosslinking
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 process enhances the thermal stability and chemical resistance of polymer particles, maintaining their mechanical and cosmetic properties, and preventing deformation during high-temperature processing.
Implementation Method 1
a process for the surface crosslinking of a polymer, in particle form, having one or more labile-hydrogen functions, comprising a step using a crosslinking agent comprising at least two functions capable of reacting with the labile-hydrogen functions of the polymer
Data Source
AI summary
The invention concerns a method for the surface crosslinking of a polymer, in particle form, having one or a plurality of labile hydrogen functions, comprising a step of implementing a crosslinking agent comprising at least two functions likely to react with the labile hydrogen functions of the polymer, the crosslinking method being carried out at a temperature lower than the melting point of the polymer. The invention also concerns a powder particle and the uses of same.