PTFE, PFA, FEP, PVDF Fluoroplastic products industry experts
Analysis of polytetrafluoroethylene film and its hydrophobicity and process and calendering processing
Classification:
Industry dynamics
Author:
PFA tube little sister
Source:
Dankai
Release time:
2022-12-10
Visits:
Wettability is a solid surface property, which is closely related to nature and human society. We can see phenomena related to wetness everywhere, such as water spreading on the surface of objects, in car windows
Dripping, rolling on the lotus leaves, and rain washing away the dust on the leaves. Superhydrophobicity is a special phenomenon of surface wetting, which refers to the large contact angle between the liquid droplet and the solid surface.
Surface phenomena at 150 ° with a lag angle of less than 10 °. With the study of superhydrophobic phenomenon, it is found that superhydrophobic surface has excellent anti-fog, anti-corrosion, drag reduction, anti-adhesion,
It not only affects the daily life of natural organisms, but also plays an important role in industrial and agricultural production and biomedical fields.
At present, the preparation of ultra-hydrophobic surface using wet process, but because PTFE is almost insoluble in the market solvent, is not suitable for wet process, the use of low-power electron beam.
Preparation of PTFE film by evaporation method, the main research contents are:
The low-power electron beam method was used to deposit polytetrafluoroethylene (Teflon) film on the ceramic substrate, and the preparation process and substrate properties of the polytetrafluoroethylene film were studied.
Impact on performance. The results show that the surface of the prepared films are hydrophobic, and the effects of sulfuric acid concentration, etching time and deposition time on the surface morphology, roughness, hydrophobicity and
A significant effect was produced; a thin film of PTFE was deposited on ceramic and glass slides and the surface energy of the substrate was calculated. It is found that both the surface roughness and the surface energy of the substrate affect
Surface wettability, but the role of surface energy is more pronounced than roughness.
Figure 1: PTFE film source: network
By changing the preparation conditions, the super hydrophobic PTFE film was successfully prepared on the Cu film substrate etched by oxalic acid, and the maximum contact angle of the film surface reached 153.34 degrees, rolling.
The dynamic angle is almost 0 °, which has an excellent superhydrophobic effect. Through the analysis, it is further explained that the decoration of low surface energy substances is the main reason for the superhydrophobicity of the substrate surface.
Cu/PTFE composite film was prepared by annealing or H2O2 solvent treatment respectively, and the effect of process conditions on the surface of the composite film was studied.
morphology, roughness and hydrophobicity. The results showed that the surface of Cu film treated with H2O2 formed nanorod structure with large roughness.
The maximum contact angle of Cu/PTFE composite film surface is 155.17 ° and the rolling angle is 2 °, showing excellent superhydrophobicity.
Polyethylene PT/PTFE composite film was deposited on Cu film by electron beam evaporation method. The effect of the thickness of transition layer PE on the surface adhesion and hydrophobicity of the composite film was studied. Results Table
Ming, the hydrophobicity of the composite film on the Cu sheet etched by oxalic acid is better than that of the unetched, and at the same time, the adhesion is negatively correlated with the contact angle, the smaller the adhesion, the greater the contact angle, the table.
The better the surface hydrophobicity. It shows that the PE transition layer with a certain thickness can significantly reduce the adhesion of the film surface and enhance the hydrophobicity.
There are many advantages of PTFE, which is not listed one by one, but its processing performance is not good, not only the low thermal conductivity, but also its high viscosity.
Heating above the melting point, although molten but can not flow, regular plastic processing methods are not suitable for PTFE processing. The processing of polytetrafluoroethylene is mainly powder metallurgy
Gold method for sintering molding, this method is suitable for products with a certain wall thickness, but not suitable for processing PTFE film.
Especially in recent years, the application of PTFE is turning from traditional PTFE sintered products to PTFE film.
The production method of the film. Early, people have been committed to the development of other fluoroplastic varieties of PTFE modified varieties, although the processing problems have been basically solved, but these materials.
The performance of the material is not as good as PTFE, and therefore, it cannot completely replace PTFE film, especially in some harsh environments. Therefore, the development of PTFE film
Production research is more significant.
The calendering process of PTFE film is only suitable for dispersing resin. The cohesion between the resin particles is low, by a small compression shear, the molecules are easy to along the long axis of the particle.
Orientation, the formation of linear crystals, called fibrosis. This phenomenon is unique to PTFE. Using this special length, polytetrafluoroethylene water emulsion can be added to the powder
In the system, stirring for a certain period of time, the PTFE fibrils will fall to the powder and then compress it. Powders can be made solid. This solid is then calendered, also.
Polytetrafluoroethylene filled modified films can be obtained. Different powders give different properties to PTFE films. Such as adding TiO powder in PTFE water emulsion,
The produced film can be used as a battery separator in a Ni-Zn secondary battery instead of the PP or PA film used previously.
This article is originally created by Teflon's little sister. Welcome to pay attention and take you to grow knowledge together!
Key words:
PTFE, film, surface, waterborne, preparation, substrate, processing, research
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