PVDC Core-Shell Composite for Uniform Film Extrusion
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Solution Overview
Problem
Polyvinylidene chloride (PVDC) based films face challenges in thermal processing due to low C-Cl bond energy leading to HCl elimination, forming polyenes and carbon carbides, causing non-uniform film thickness, feeding non-uniformity, and hazardous HCl gas generation.
Innovation Solution
A PVDC-based composite with a core-shell structure, where the core contains a PVDC polymer and the shell is made of nano-sized wax particles, improving flowability and reducing surface roughness to enhance uniform film thickness and prevent HCl gas generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If PVDC is subjected to thermal processing such as extrusion molding, then film production is enabled, but HCl elimination occurs leading to decomposition, carbide formation, and non-uniform film thickness
Solution Approach 1:
The patent applies preliminary action by pre-coating PVDC particles with a silane coupling agent before extrusion molding. This pre-treatment modifies the particle surface to improve melt流动性 and prevent decomposition during thermal processing, thereby ensuring uniform film thickness while enabling thermal processing capability
Solution Approach 2:
The patent changes physical parameters by controlling particle size distribution (D10: 50-150 μm, D50: 150-250 μm, D90: 250-350 μm) and using silane coupling agents to modify surface properties. These parameter changes improve flowability and thermal processing stability, preventing HCl elimination and carbide formation during extrusion
2Productivity
If PVDC particles are used directly in extrusion molding, then film production is possible, but feeding non-uniformity occurs due to high surface roughness and poor flowability
Solution Approach 1:
The patent applies preliminary action by pre-coating PVDC particles with silane coupling agents and controlling particle size distribution before extrusion. This pre-treatment smooths particle surfaces and improves flowability, ensuring uniform feeding during extrusion molding while maintaining high production efficiency
Solution Approach 2:
The patent changes physical parameters by optimizing particle size distribution (D10: 50-150 μm, D50: 150-250 μm, D90: 250-350 μm) and applying silane coupling agent coatings. These changes reduce surface roughness and improve inter-particle flow, eliminating feeding non-uniformity while maintaining productivity
3Ease of manufacture
If PVDC undergoes decomposition during extrusion, then carbides are formed causing contamination, but HCl gas is generated posing safety hazards
Solution Approach 1:
The patent applies preliminary anti-action by pre-coating PVDC particles with silane coupling agents that stabilize the polymer during thermal processing. This pre-protection prevents decomposition and HCl elimination reactions, eliminating carbide formation and HCl gas generation while maintaining processing feasibility
Solution Approach 2:
The patent changes chemical parameters by introducing silane coupling agents that modify the thermal stability of PVDC particles. This chemical modification raises the decomposition temperature and prevents HCl elimination, eliminating harmful emissions while allowing standard extrusion processing
Data Source
AI summary
The present invention relates to a polyvinylidene chloride (PVDC)-based composite and a method for preparing the same. The PVDC-based composite includes a core including a PVDC-based polymer; and a shell surrounding the core and including wax. The wax is nano-sized particles.