TFE-PPVE Copolymer Composition for Thick Wire Coating Durability
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Solution Overview
Problem
Existing polymers used for injection molding and extrusion forming of thick coatings on large-diameter core wires face issues with corrosion of metal molds, poor mechanical strength, high haze, and inadequate chemical and ozone resistance, leading to poor durability and permeability, especially at high temperatures.
Innovation Solution
A copolymer composed of tetrafluoroethylene (TFE) and perfluoro(propyl vinyl ether) (PPVE) units, with specific content ratios and melt flow rates, is developed to enhance formability, reduce haze, and improve mechanical strength, chemical resistance, and ozone resistance, while minimizing mold corrosion and fluorine ion dissolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a molded body made of polyacrylic acid or polyacrylamide is used as a water-soluble master batch carrier, then water solubility is improved, but the molded body disintegrates during storage and cannot be handled
Solution Approach 1:
The patent changes the chemical parameters of the polymer by introducing a graft copolymer structure where polyacrylic acid or polyacrylamide is grafted onto a different polymer backbone. This structural modification allows the material to maintain water solubility through the graft chains while the backbone provides structural integrity during storage, preventing disintegration.
Solution Approach 2:
The patent creates a composite structure by forming a graft copolymer that combines two different polymer components: the water-soluble polyacrylic acid or polyacrylamide chains and a different polymer backbone. This composite structure achieves both water solubility and storage stability by distributing these properties across different parts of the molecular structure.
2Productivity
If a water-soluble master batch carrier is designed to dissolve quickly in water, then dissolution speed is improved, but the carrier loses mechanical strength and handles poorly
Solution Approach 1:
The patent modifies the polymer structure by creating a graft copolymer where the ratio and length of water-soluble graft chains can be controlled. This allows optimization of dissolution speed while the crosslinked backbone structure maintains mechanical strength, resolving the contradiction between quick dissolution and handleability.
Solution Approach 2:
The patent introduces dynamic behavior to the polymer structure through the graft copolymer design, where the material maintains structural integrity during storage and handling, then dynamically transitions to rapid dissolution when contacted with water. The graft structure allows the material to be mechanically strong in dry state but highly soluble when wet.
Data Source
AI summary
There is provided a copolymer containing tetrafluoroethylene unit and perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of perfluoro(propyl vinyl ether) unit of 4.4 to 6.0% by mass with respect to the whole of the monomer units, a melt flow rate at 372°C of 7.5 to 11.0 g/10 min, and the number of functional groups of 40 or less per 106 main-chain carbon atoms.