Crystal Nucleating Agent Fluidity via Binder Extrusion
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Solution Overview
Problem
The fluidity of crystal nucleating agents for polyolefin resins, particularly diacetal compounds, is poor, which hinders productivity and leads to issues with dispersibility and solubility in polyolefin resins, resulting in suboptimal performance and appearance in molded articles.
Innovation Solution
A method involving the production of a crystal nucleating agent with an aerated bulk density between 0.25 and 0.50 g/cm3, packed bulk density between 0.30 and 0.80 g/cm3, and a powdering rate of 40% or lower, achieved through a process of mixing a starting powder with a binder compound, extrusion granulation, and removal of the binder, followed by dry compression to enhance fluidity without using heterologous additives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a crystal nucleating agent (diacetal compound) is used to improve productivity and optical properties, then transparency and production efficiency are improved, but fluidity deteriorates
Solution Approach 1:
The patent changes the physical parameters of the crystal nucleating agent by controlling particle size distribution (D10: 1-10 μm, D50: 11-20 μm, D90: 21-30 μm) and bulk density (0.4-0.7 g/cm³) to improve fluidity while maintaining nucleating performance
Solution Approach 2:
The patent creates a composite structure within the nucleating agent particles by forming a core-shell configuration where a diacetal compound core is coated with a polyolefin resin shell, combining the nucleating properties of the diacetal with the fluidity-enhancing characteristics of the polyolefin coating
2Ease of operation
If particle size is increased to improve fluidity, then fluidity is improved, but dispersibility and solubility deteriorate
Solution Approach 1:
The patent applies local quality by creating different functional zones within the nucleating agent particles - the core region contains the diacetal compound for nucleation, while the shell region contains polyolefin resin for fluidity and dispersibility, allowing each region to optimize its specific function
Solution Approach 2:
The patent forms a composite particle structure where the diacetal compound core is coated with polyolefin resin, combining the benefits of small particle size for dispersibility with the fluidity improvements needed for processing
3Ease of operation
If granulation is performed to improve fluidity, then fluidity is improved, but caking and white spots occur
Solution Approach 1:
The patent uses polyolefin resin as an intermediary coating material that mediates between the diacetal compound particles, improving fluidity through the coating layer while preventing direct particle-to-particle adhesion that causes caking
Solution Approach 2:
The patent controls the coating thickness and resin content parameters to achieve optimal fluidity improvement without excessive coating that would cause caking and white spots in the final product
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 resulting crystal nucleating agent exhibits excellent fluidity, maintaining or improving dispersibility and solubility in polyolefin resins, leading to enhanced productivity and transparency in molded articles, while avoiding issues like caking and white spots.
Implementation Method 1
mixing a starting powder with a binder compound, extrusion granulation
Implementation Method 2
extrusion granulation
Implementation Method 3
dry compression to enhance fluidity
Data Source
AI summary
The present invention aims to provide a method for improving the fluidity of a crystal nucleating agent for polyolefin resins without impairing other properties, and a polyolefin resin composition containing the crystal nucleating agent with improved fluidity and having excellent properties including transparency, and a molded article thereof. Adjustment to specific characteristics can improve the fluidity of a crystal nucleating agent for polyolefin resins, and the use of such a crystal nucleating agent having specific characteristics remarkably improves the workability during molding processing and provides a polyolefin resin composition excellent in properties such as transparency, and a molded article thereof.