PTFE Particle Dispersant PFOA Content Control
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Solution Overview
Problem
Polytetrafluoroethylene (PTFE) particles experience decreased dispersibility and aggregation when the state of the mixed component changes, such as during evaporation of a dispersion medium or melting of a powder, due to the presence of perfluorooctanoic acid (PFOA), leading to a low dispersion state in layered materials.
Innovation Solution
Attaching a fluorine-containing dispersant to PTFE particles with a controlled content of PFOA from 0 to 25 ppb, preferably 0.01 to 20 ppb, to maintain dispersion state stability by suppressing changes in the attachment state of the dispersant during state changes of the mixed components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If perfluorooctanoic acid (PFOA) is used as a dispersant for PTFE particles, then dispersibility is improved initially, but dispersibility decreases and aggregation occurs when the state of the mixed component changes (evaporation or melting)
Solution Approach 1:
The invention changes the chemical parameter of the dispersant from PFOA to a fluorine-containing dispersant with specific molecular structure (containing fluorinated alkyl groups). This parameter change resolves the contradiction by providing a dispersant that maintains its dispersing function even when the state of mixed components changes, preventing aggregation while maintaining dispersibility.
Solution Approach 2:
The invention uses a composite dispersant system comprising a fluorine-containing dispersant with specific structural features (fluorinated alkyl groups) attached to PTFE particles. This composite approach creates a stable dispersion system where the dispersant maintains its effectiveness through state changes of other components, solving both the dispersibility and stability requirements.
2Stability of the object's composition
If a dispersant is attached to PTFE particles to maintain dispersion state, then aggregation is prevented, but the attachment state of the dispersant changes when the state of mixed components changes
Solution Approach 1:
The invention changes the chemical parameters of the dispersant molecule, specifically incorporating fluorinated alkyl groups with specific chain lengths and structures. These parameter changes create a dispersant with stable attachment characteristics that do not change when the state of mixed components changes, resolving the reliability issue while maintaining dispersion stability.
3Quantity of substance
If PFOA content is increased to improve dispersibility, then initial dispersion is enhanced, but maintainability of dispersion state decreases when component state changes
Solution Approach 1:
The invention changes the fundamental chemical parameter of the dispersant from PFOA to a fluorine-containing dispersant with specific molecular architecture including fluorinated alkyl groups. This parameter change provides both high dispersibility and long-term maintainability of the dispersion state even when component states change, resolving the contradiction between initial dispersibility and duration of action.
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 dispersant attached PTFE particles maintain high dispersibility and prevent aggregation even when the mixed component state changes, resulting in improved maintainability and surface properties like lubricity and hydrophobicity in layered materials.
Implementation Method 1
a dispersant having a fluorine atom is attached on its surface
Data Source
AI summary
A dispersant attached polytetrafluoroethylene particle on whose surface a dispersant having a fluorine atom is attached has a content of perfluorooctanoic acid of from 0 ppb to 25 ppb with respect to the polytetrafluoroethylene particle, and a composition contains a polytetrafluoroethylene particle and a dispersant having a fluorine atom in which a content of perfluorooctanoic acid is from 0 ppb to 25 ppb with respect to the polytetrafluoroethylene particle.