External compression type hollow fiber ultrafiltration membrane and preparation method
A fiber membrane and hollow technology, which is applied in the field of external pressure polyvinylidene fluoride porous hollow fiber membrane and its production method, can solve the problem of inability to meet the requirements of industrial production, unsatisfactory effect of ultra- and micro-filtration membranes, and uneven distribution of membrane pore sizes. and other problems, to achieve the effects of good chemical cleaning resistance and hydrophilicity, excellent anti-pollution ability, and good anti-pollution characteristics.
Inactive Publication Date: 2011-11-23
苏州膜华材料科技有限公司
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, most of the commercialized ultra- and microfiltration membranes are not ideal and cannot meet the requirements of industrial production.
On the other hand, at present, most ultra- and microfiltration membranes are prepared by non-solvent-induced phase separation. Most of the produced membranes contain finger-shaped large cavity structures, and the membrane pore size distribution is uneven and the strength is poor. It is easy to break when used in sewage. Membrane life is short, not suitable for application in membrane bioreactor process
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0052] The blended polymer composed of PVDF drying resin with a mass percentage of 40% and polyoxyethylene drying resin with a mass percentage of 3.2% is added to a mixed solvent composed of glycerol acetate and ethylene glycol, wherein glycerol ethyl The mass percent of acid ester is 33.1% (wt), and the mass percent of ethylene glycol is 23.7%. The above mixture was added into a stirred tank, stirred and dissolved at a temperature of 155° C. and a rotational speed of 120 rpm for 24 hours, then cooled and granulated in air to obtain a blended raw material. The previously prepared blend was fed into the twin-screw extruder at a feed rate of 8 kg / h. The temperatures in zones 1-8 of the extruder were 110°C, 125°C, 140°C, 150°C, 150°C, 155°C, 155°C, and 150°C, respectively, and the screw speed was 120 rpm. After the mixed material is melted and extruded in a twin-screw machine, it is extruded through a filter and a spinning pump into a four-hole annular die to make a hollow as-sp...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| thickness | aaaaa | aaaaa |
| pore size | aaaaa | aaaaa |
| tensile strength | aaaaa | aaaaa |
Login to View More
Abstract
The invention relates to a polyvinylidene fluoride porous hollow fiber membrane and a preparation method thereof. The membrane comprises the following components in percentage by mass: 25 to 48 percent of polyvinylidene fluoride (PVDF) serving as a first polymer P1, 0 to 5 percent of polyethylene oxide (PEO) serving as a second polymer P2, 31 to 44 percent of glyceryl acetate serving as a first diluent D1, and 18 to 34 percent of glycol serving as a second diluent D2. The PVDF hollow fiber ultrafiltration membrane and the PVDF hollow fiber microfiltration membrane which are prepared by adopting the method have excellent chemical stability, and are the hollow fiber membrane with pollution resistance and high strength; and the method can provide high performance membrane products for MBR process.
Description
technical field [0001] The invention relates to a polyvinylidene fluoride (PVDF) porous hollow fiber membrane and a preparation method thereof, in particular to an external pressure type polyvinylidene fluoride (PVDF) porous hollow fiber membrane and a preparation method thereof. Background technique [0002] Membrane bioreactor process (MBR) is a new and efficient sewage treatment technology, which can realize biocatalytic reaction and separation of water and degraded substances at the same time, so that water resources can be regenerated and water quality standards can be realized. It is a contemporary advanced, high-efficiency and low-energy-consumption wastewater advanced treatment and new technology for regeneration and reuse. Among them, the preparation of ultrafiltration membranes and microfiltration membranes with high strength, good anti-pollution performance and low cost is the core technology of membrane bioreactor technology. However, most of the commercialized ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D69/08
Inventor 奚韶锋洪耀良陈翠仙
Owner 苏州膜华材料科技有限公司