Fluorinated Polymer Pellets for Stable Electrolysis Voltage
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Solution Overview
Problem
Existing ion exchange membranes exhibit large variations in electrolysis voltage, which affects production efficiency, when produced using pellets of fluorinated polymers with high ion exchange capacity.
Innovation Solution
The method involves extruding a melt of fluorinated polymer with convertible ion exchange groups at a die temperature below 200°C and converting these groups to ion exchange groups to achieve an ion exchange capacity of at least 1.1 meq/g resin, resulting in pellets with a light transmittance of 30 to 60%, which suppresses aggregation and pressure variation during film formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If pellets of fluorinated polymer with high ion exchange capacity are used to produce ion exchange membranes, then the ion exchange capacity is improved, but the electrolysis voltage stability deteriorates
Solution Approach 1:
The invention changes the die temperature parameter to below 200°C and controls the ion exchange capacity to 1.01-2.00 meq/g, which resolves the contradiction between achieving high ion exchange capacity and maintaining electrolysis voltage stability
Solution Approach 2:
The invention performs preliminary control of the die temperature and ion exchange capacity during pellet production, which prevents subsequent aggregation and pressure variation issues during film formation, thereby ensuring stable electrolysis voltage
2Manufacturing precision
If the die temperature is reduced to below 200°C to suppress aggregation, then the membrane thickness uniformity is improved, but the extrusion efficiency deteriorates
Solution Approach 1:
The invention optimizes the die temperature parameter to below 200°C, which balances membrane thickness uniformity with acceptable extrusion efficiency by preventing aggregation while maintaining production capability
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
This approach leads to an ion exchange membrane with improved stability of electrolysis voltage by ensuring uniform membrane thickness and reduced deviation in electrolysis voltage when applied to an electrolysis apparatus.
Implementation Method 1
extruding a melt containing a fluorinated polymer having groups convertible to ion exchange groups from a die of a melt-extruder to obtain a strand containing the fluorinated polymer
Implementation Method 2
when the groups convertible to ion exchange groups of the fluorinated polymer are converted to ion exchange groups, the ion exchange capacity of the resulting fluorinated polymer is at least 1.1 meq/g resin
Data Source
AI summary
A pellet of a fluorinated polymer having groups convertible to ion exchange groups such that the fluorinated polymer has ion exchange capacity of at least 1.1 milliequivalent/g dry resin upon conversion of the convertible groups to ion exchange groups is provided. The pellet has a visible light transmittance of from 30 to 60% in a light wavelength range of 400 to 700 nm. An ion exchange membrane obtained by melt extrusion of the pellet is also provided.