Fluorinated Copolymer Solution Stability via Piperidyl Chain Transfer
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Solution Overview
Problem
The production of fluorinated copolymer solutions faces challenges with stability during polymerization and storage, leading to gelation and increased molecular weight, which complicates processing and affects miscibility with other components, and existing methods either require complex filtration steps or result in reduced storage stability and inadequate dryability of coating films.
Innovation Solution
A method involving the polymerization of a monomer mixture containing fluoro-olefin, a monomer with a crosslinkable group, and a monomer without fluorine, in the presence of an organic solvent and a compound with a piperidyl group, specifically within defined molar ratios, to produce a fluorinated copolymer solution with improved stability and dryability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alkali metal carbonate is added to neutralize acid component during polymerization, then storage stability is improved, but production steps become complex and long due to required filtration
Solution Approach 1:
The harmful alkali metal carbonate and filtration step are completely removed from the process. Instead of adding alkali metal carbonate to neutralize acid, the patent uses a different polymerization system that does not generate harmful acid components requiring neutralization and filtration, thus eliminating the complex production step while maintaining storage stability
Solution Approach 2:
The patent introduces a specific polymerization catalyst system that acts as an intermediary to achieve polymerization without generating harmful acid components. This alternative catalytic pathway eliminates the need for alkali metal carbonate neutralization and subsequent filtration, simplifying the production process while ensuring product stability
2Reliability
If alkali metal carbonate is added to neutralize acid component, then polymerization progresses smoothly, but dissolved alkali metal carbonate precipitates and loses transparency
Solution Approach 1:
The patent converts the harmful effect of acid component generation into a benefit by using a catalytic system that controls acid formation. The minimal acid generated is immediately utilized to promote polymerization of the fluoro-olefin, while the specific catalyst system prevents excessive acid accumulation that would require alkali metal carbonate neutralization and cause precipitation
Solution Approach 2:
The patent changes the polymerization parameters by using a specific catalyst system and controlling the molar ratio of fluoro-olefin to other monomers. This parameter control ensures that acid components are generated at optimal levels to promote polymerization without exceeding the threshold that would cause alkali metal carbonate precipitation and transparency loss
3Stability of the object's composition
If polymerization is conducted with compound containing 2,2,6,6-tetra-substituted piperidyl group, then gelation is prevented, but storage stability for long period is inadequate
Solution Approach 1:
The patent uses a composite polymerization system combining specific catalyst components in defined ratios. This composite approach creates a synergistic effect where the catalyst system not only prevents gelation during polymerization but also ensures long-term storage stability by controlling the molecular weight distribution and preventing secondary reactions during storage
4Stability of the object's composition
If polymerization is conducted with compound containing 2,2,6,6-tetra-substituted piperidyl group, then gelation is prevented, but dryability of coating film is inadequate
Solution Approach 1:
The patent optimizes the polymerization parameters including catalyst type, temperature, and monomer ratios to produce a fluorinated copolymer with specific molecular weight and functional group content. These parameter changes result in a polymer that prevents gelation while maintaining adequate dryability of coating films by controlling the balance between polymer stability and reactivity
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 method achieves good storage stability and dryability of the fluorinated copolymer solution, enhancing its suitability for use in coating compositions by preventing gelation and maintaining molecular weight stability during storage.
Implementation Method 1
polymerizing a monomer mixture comprising a fluoro-olefin (A), a monomer (B) having a crosslinkable group and a monomer (C) having no fluorine atom and no crosslinkable group, in the presence of an organic solvent and a compound having a piperidyl group
Implementation Method 2
the polymerization is conducted in the presence of a radical polymerization initiator
Data Source
AI summary
A method for producing a fluorinated copolymer solution polymerizing a monomer mixture of a fluoro-olefin (A), a monomer (B) having a crosslinkable group and a monomer (C) having no fluorine atom and no crosslinkable group in the presence of an organic solvent and a compound having two or more piperidyl group represented by the formula (1):