Polyvinylidene fluoride hollow fiber membrane with mesh structure and preparation method thereof
A technology of polyvinylidene fluoride and pore structure, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of membrane pore structure and membrane strength, and achieve high interception accuracy, good compatibility, and permeability Good results
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[0032] In view of the problems of poor porosity, thick and dense skin layer and low flux in conventional solid-liquid phase separation membranes in the prior art, the present invention provides a method for preparing polyvinylidene fluoride hollow fiber membranes with a network pore structure to solve Technical problems with existing products.
[0033]Specifically, the present invention mixes a small amount of ultra-high molecular weight polyvinylidene fluoride as an additive with polyvinylidene fluoride of ordinary molecular weight, and the system is prepared by S-L phase separation of thermally induced phase separation method to obtain thin skin, good surface porosity, support The PVDF hollow fiber membrane with a net-like pore structure not only avoids the thick skin layer and spherical particle structure formed by the S-L phase separation membrane, but also avoids the disadvantages of harsh preparation conditions and high temperature for L-L phase separation, and at the sam...
Embodiment 1
[0045] (1) Ultra-high molecular weight polyvinylidene fluoride (molecular weight 1.3 million) / ordinary molecular weight polyvinylidene fluoride (weight average molecular weight 330,000) / diluent (dibutyl phthalate) in a mass ratio of 6 / 20 / 74 was added to the reaction kettle, mixed and stirred at 170°C for 3 hours, and then vacuum defoamed for 3 hours to obtain a uniform casting solution;
[0046] (2) Use diluent (dibutyl phthalate) as the core liquid, the temperature of the core liquid is 80°C, the flow rate of the core liquid is 0.03L / min, and the casting liquid is measured by the spinning pump at a flow rate of 0.05L / min min, continuously extruded from the hollow fiber spinneret, after passing through an air gap of 0.5cm, immersed in a coagulation bath (deionized water) at 25°C for cooling and forming, and then soaked in absolute ethanol for 48h to extract the remaining diluent, and then soaked in deionized water for 24 hours to remove residual ethanol, and finally the membr...
Embodiment 2
[0051] (1) Ultra-high molecular weight polyvinylidene fluoride (molecular weight 1.3 million) / ordinary molecular weight polyvinylidene fluoride (weight average molecular weight 330,000) / diluent (dibutyl phthalate) in a mass ratio of 4 / 22 / 74 was added to the reaction kettle, mixed and stirred at 160°C for 3 hours, and then vacuum defoamed for 3 hours to obtain a uniform casting solution;
[0052] (2) Use diluent (dibutyl phthalate) as the core liquid, the temperature of the core liquid is 80°C, the flow rate of the core liquid is 0.03L / min, and the casting liquid is measured by the spinning pump at a flow rate of 0.05L / min min, continuously extruded from the hollow fiber spinneret, after passing through an air gap of 0.5cm, immersed in a coagulation bath (deionized water) at 25°C to cool and form, and then soak the membrane silk in absolute ethanol for 48h, and use a purity of 99% The residual diluent in the membrane was extracted with ethanol, and then soaked in deionized wat...
PUM
| Property | Measurement | Unit |
|---|---|---|
| Breaking strength | aaaaa | aaaaa |
| Breaking strength | aaaaa | aaaaa |
| Pure water flux | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More