Fluoropolymer Composition for Architectural Films
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Solution Overview
Problem
Existing fluoropolymer compositions struggle to balance mechanical properties and transparency, with semi-crystalline ECTFE films offering excellent transparency but reduced mechanical resistance, while ETFE films have good mechanical properties but poor transparency.
Innovation Solution
A thermoplastic fluoropolymer composition comprising 51-99% of polymer A with an excess of halogenated recurring units from ethylene and chlorotrifluoroethylene or tetrafluoroethylene, combined with 1-49% of polymer B containing hexafluoroisobutylene or perfluoropropylvinylether recurring units, to achieve films with improved mechanical resistance and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If semi-crystalline ECTFE is used to improve transparency, then optical properties are improved, but mechanical resistance is reduced
Solution Approach 1:
The invention uses a composite material system consisting of polymer A (semi-crystalline ECTFE with 40-49 mol% ethylene) and polymer B (fluorinated polymer with HFIB/PPVE units). This composite combines the transparency benefits of semi-crystalline ECTFE with the mechanical strength provided by the fluorinated polymer containing hexafluoroisobutylene and/or perfluoropropylvinylether units, resolving the contradiction between optical properties and mechanical resistance.
2Strength
If ETFE is used to improve mechanical properties, then strength is improved, but transparency is reduced
Solution Approach 1:
The invention applies local quality by creating a blend where polymer A (51-99 wt%) provides the transparency function while polymer B (1-49 wt%) provides the mechanical strength function. Each polymer component is optimized for its specific function, with the overall composition achieving both excellent transparency and mechanical properties through this functional differentiation.
Data Source
AI summary
The invention pertains to a thermoplastic fluoropolymer composition comprising one or more polymer A comprising recurring units derived from ethylene and recurring units derived from halogenated monomers selected from chlorotrifluoroethylene (CTFE) and tetrafluoroethylene (TFE) and one or more polymer B comprising recurring units derived from ethylene, recurring units derived from halogenated monomers selected from CTFE and TFE, and recurring units derived from hexafluoroisobutylene (HFIB) and/or perfluoropropylvinylether (PPVE). The resulting composition allows to manufacture films having exceptional transparency and good mechanical properties which can be used for examples as architectural films.