PTFE, PFA, FEP, PVDF Fluoroplastic products industry experts
Development and Reform of Teflon Film
Classification:
Industry dynamics
Author:
PFA tube little sister
Source:
Dankai
Release time:
2022-12-14
Visits:
Introduction of 1. Teflon Film
As early as the middle of the 18th century, some people discovered the membrane phenomenon, but it was nearly 50 years before the membrane process was applied to the industrial field. In China, the film industry started in the last century 60 years
After decades of development, membrane technology has become a new and mature chemical separation technology. Has matured and developed reverse osmosis, ultrafiltration, micro
Filtration, nanofiltration, electrodialysis, gas separation, inorganic membranes, pervaporation, membrane contact, membrane reaction and controlled release technologies are being used in industrial production, and have produced a lot
Good economic and social benefits. The membrane separation process has become an important high-tech and sustainable development technology to solve the problems of contemporary energy, resources and environmental pollution. its
Microfiltration is currently the most widely used and the largest total sales of a pressure-driven membrane technology, mainly used for particle separation, purification, concentration and purification processes, widely used in
Food, medicine, drinking water, urban sewage treatment and so on.
Since the middle of the last century, microfiltration membranes (microporous membranes) have been successfully used in a wide range of industrial fields, such as the separation of special metal ions from the liquid phase, industrial water treatment, plasma
Separation, battery separator, pharmaceutical separation, chemical product purification, drug release, human organs, moisture permeable and breathable materials, the membrane market share of its products has accounted for a considerable share in the world.
large proportion. With the continuous expansion of the application field of microporous membrane and the improvement of application requirements, it can be predicted that in the domestic and even international markets, various microporous membrane products have extremely
It is of great practical significance and economic benefits to promote and develop new microfiltration membrane technology and realize the localization of products.
Teflon microporous membrane formed by biaxial stretching process plays an important role in membrane technology. In the 1970 s, Gore Company of the United States made two-way pulling through mechanical stretching.
Extensible Teflon microporous membrane. Since then, with the improvement of raw material preparation technology and stretching process of Teflon resin, the quality of Teflon microporous membrane has been continuously improved. At the same time, Teflon microporous membrane
Excellent physical and chemical properties in many high-tech fields have also been widely used. In view of the special properties of such products, Japan and many other countries are also biaxially stretched Teflon micro
The preparation technology of porous membrane and the morphological structure of the membrane have been studied, and good progress has been made.
Hydrophilic Modification of 2. PTFE Film
PTFE microporous film is hydrophobic, low surface energy, poor surface wettability, and when it is used in membrane bioreactors, it needs to be invasive with water, so it must be.
Hydrophilic modification was carried out to increase the contact angle and improve its wettability.
At present, the related research methods mainly include wet chemical treatment, high temperature melting method, low temperature plasma method, radiation grafting method, laser treatment method, ion beam injection method, electric
From the reduction method, force chemical treatment method, etc. The above methods can effectively improve the adhesion and wettability of PTFE polytetrafluoroethylene film.
Dong Rui et al. used AI(OH)3 colloid to hydrophilically modify PTFE microporous membrane, and the results showed that AI(OH)3 colloid could be stably adsorbed on the microporous membrane.
Yunxia et al. used aniline dispersion polymerization in-situ film formation method to introduce rigid polymer polyaniline (PANI) into the plasma pre-treated polytetrafluoroethylene film for hydrophilic modification.
Compared with the original membrane, the contact angle of the PANI/PTFE composite membrane was significantly reduced, and the hydrophilicity of the PTFE/PTFE membrane was significantly improved.
3. PTFE membrane for oily wastewater treatment
Oily wastewater contains a large number of COD, suspended solids, petroleum organic matter, volatile phenol, sulfide and other harmful substances, which is a kind of serious pollution, complex composition, wide range of sources and difficult
Industrial wastewater that is difficult to dissolve and degrade.
The methods of treating oily wastewater can be summarized as physical, chemical and biological methods, as well as other emerging water treatment technologies. Due to the complexity of oily wastewater, the use of a single
It is difficult to meet the emission standards, so a variety of methods are used to combine treatment technology. Membrane separation, as an emerging treatment technology, is currently used in the treatment of oily wastewater in oil fields.
It is microfiltration, ultrafiltration and reverse osmosis, but compared with ultrafiltration and reverse osmosis, microfiltration generally treats nanoscale particles, which have greater flux and anti-pollution ability.
oily wastewater is more economical and applicable. The PTFE film has high mechanical strength, indicating that the active agent has little effect, and when the pore size is small enough, it can produce better demulsification effect.
The combined process of hydrolysis acidification and PTFE membrane bioreactor is used to treat the oily wastewater from the simulated oilfield in the laboratory.
The hollow fiber membrane module provided has a membrane pore size of 0.1-0.2 μm. The experimental results show that the combined process of simulated oily wastewater COD, ammonia nitrogen, petroleum pollutants, volatile
The results show that the process can be well applied to the treatment of industrial oily wastewater. The entrapment efficiency of PTFE membrane for contaminants is in
10% ~ 98%, and is not affected by immersion organic compound and hydraulic retention time, which plays a positive role in the treatment of oily wastewater. PTFE film was also carried out with polyvinylidene fluoride
Ethylene raw water filtration comparison experiment, the experiment found that PTFE flux is larger, oil resistance is better, confirmed the advantages of PTFE film for oily wastewater treatment.
This article is originally created by Teflon's little sister. Welcome to pay attention and take you to grow knowledge together!
Key words:
Teflon, film, oily, microporous, technology, wastewater, treatment
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