Resin Particle Production via Modified PVA Matrix Elution
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Solution Overview
Problem
Existing methods for producing resin particles face challenges such as low productivity, poor handleability, and altered functional group concentrations due to limitations in melt moldability and water solubility, especially when using polyvinyl alcohol-based resins with high melting points or glass transition temperatures.
Innovation Solution
A method involving the use of a modified polyvinyl alcohol-based resin with hydrophilic modifying groups, such as alkyl groups with hydroxyl groups, to improve melt moldability and water solubility, allowing for efficient production of thermoplastic resin particles with maintained functional group concentrations, even at high resin content and varied melt-kneading temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polyethylene glycol is used as a water-soluble component for melt-kneading, then resin particles can be produced by eluting the water-soluble component, but the solidification rate is extremely slow and handleability is reduced
Solution Approach 1:
The patent changes the physical and chemical parameters of the water-soluble component by using a copolymer of vinyl alcohol and acrylic acid instead of polyethylene glycol. This copolymer has a higher melting point and faster solidification rate, resolving the handleability issue while maintaining the ability to produce resin particles through elution.
Solution Approach 2:
The patent uses a composite water-soluble component consisting of a copolymer with specific functional groups (carboxyl groups from acrylic acid). This composite structure provides both the necessary solubility for particle formation and the structural integrity for handleability, overcoming the limitations of single-component systems.
2Adaptability or versatility
If a thermoplastic resin including functional groups is used, then resin particles with functional properties can be produced, but peroxide generated during kneading reacts with the functional groups and changes their concentration
Solution Approach 1:
The patent introduces a copolymer of vinyl alcohol and acrylic acid as an intermediary substance during melt-kneading. This copolymer acts as a protective medium that prevents direct contact between peroxide and the functional groups of the thermoplastic resin, thereby maintaining stable functional group concentrations in the resulting particles.
Solution Approach 2:
The copolymer creates a protective environment during kneading that isolates the functional groups from oxidative degradation by peroxide. This inert-like protective layer preserves the original functional group concentration, ensuring reliability for applications requiring specific functional properties.
3Ease of manufacture
If oligosaccharide and sugar alcohol are used as water-soluble auxiliary components, then resin particles can be produced by elution, but these components are easily scorched at elevated temperature and melt-kneading with high melting point resins becomes difficult
Solution Approach 1:
The patent fundamentally changes the temperature parameter compatibility by selecting a copolymer with a melting point of 80-150°C that can withstand higher processing temperatures without scorching. This allows successful melt-kneading with thermoplastic resins having melting points above 150°C, expanding the applicable temperature range significantly.
Solution Approach 2:
The copolymer serves as a temporary, disposable water-soluble matrix that is easily removed by water elution after serving its purpose during melt-kneading. Its ability to withstand high temperatures temporarily makes it suitable for processing high-melting-point resins, after which it is completely removed, leaving no residual scorching effects.
4Productivity
If the content of thermoplastic resin relative to the matrix is increased, then productivity of resin particles can be improved, but oddly shaped particles are formed and handleability is reduced
Solution Approach 1:
The patent optimizes the compositional parameters by using a copolymer with specific functional group concentrations (0.1-10 mmol/g carboxyl groups). This optimized composition allows for higher thermoplastic resin content (up to 90 wt% or more) while maintaining spherical particle shape and uniformity, thereby improving productivity without sacrificing particle quality.
Solution Approach 2:
The copolymer matrix with composite structure (vinyl alcohol backbone with acrylic acid side chains) provides enhanced structural support even at low concentrations. This composite structure prevents particle deformation and aggregation during high-speed discharge, enabling high productivity while maintaining excellent particle shape and handleability.
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 approach enhances the production efficiency of resin particles by improving melt moldability, maintaining functional group concentrations, and increasing discharge rates, resulting in easily handled forms like pellets, thereby improving overall productivity.
Implementation Method 1
a water-soluble matrix, containing a water-soluble polyvinyl alcohol-based resin, and a non-water-soluble resin to form a pre-molded article (or a dispersion) in which the non-water-soluble resin is dispersed in particulate form in the matrix; and bringing this pre-molded article (or the dispersion) into contact with an aqueous solvent to elute the matrix
Implementation Method 2
melt-kneading a water-soluble matrix, containing a water-soluble polyvinyl alcohol-based resin, and a non-water-soluble resin
Implementation Method 3
bringing this pre-molded article (or the dispersion) into contact with an aqueous solvent to elute the matrix
Data Source
AI summary
Provided is a method for producing resin particles by melt-kneading with a non-water-soluble resin in a wide range of melt-kneading temperature according to the melting point or glass transition temperature of the resin. This production method includes melt-kneading a water-soluble matrix, containing a modified polyvinyl alcohol-based resin, and a non-water-soluble resin to form a pre-molded article in which the non-water-soluble resin is dispersed in particulate; and bringing the pre-molded article into contact with an aqueous solvent to elute the matrix. The modified polyvinyl alcohol-based resin contains in a side chain thereof an alkyl group including at least one hydroxyl group (for example, a 1,2-dihydroxyalkyl group).