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Method for preparing hollow fiber microporous membrane by thermally-induced phase separation method

A technology of thermally induced phase separation and microporous membrane, which is applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., and can solve the problems of low water flux, low surface porosity, weakened permeability, etc. problem, to achieve the effect of increasing permeability and water production

Inactive Publication Date: 2011-06-29
林金建
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Although the microporous membrane made by the TIPS method has many advantages, however, due to the formation of closed pores on the surface of the membrane, the surface porosity is low, and the permeate flux per unit membrane area is very low, which greatly weakens the permeability of the membrane. In addition, the polymers used in the TIPS method are generally hydrophobic materials, how to maintain the stability of the water flux of the microporous membrane is a problem to be solved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1, PVDF, λ-butyrolactone, polyethylene glycol, and calcium carbonate weight percentages are respectively 40%, 30%, 20%, and 10% added together in a mixing tank, and stirred at a temperature of 150° C. for two hours, The extruder metering pump can be used to introduce the inserted tubular spinning assembly, the central tube is fed with the core liquid ethylene glycol, and the outer diameter is 1.5MM, the wall thickness is 0.35MM, and the measured flux is 500L / m 2 .h; After the hollow microfiltration membrane runs for one hour, it stabilizes at 400L / m 2 .h unchanged;

Embodiment 2

[0026] Example 2, PVDF, λ-butyrolactone, ethylene glycol, DMA, and silicon dioxide with a molecular weight of about 600,000 are respectively added to mix and stir at 35%, 35%, 15%, 10%, and 5% by weight In the kettle, heat up to 150°C, stir for two hours, and enter the spinning assembly through the metering pump of the extruder. temperature at 20°C, followed by winding to obtain a hollow fiber with an outer diameter of 1.5MM and a wall thickness of 0.35MM, and the measured pure water flux is 1000L / m 2 .h, 800L / m after stabilization 2 .h;

Embodiment 3

[0027] Embodiment three, the weight percentage of PVDF, ethylene glycol, butyrolactone, and titanium dioxide are respectively 35%, 20%, 40%, and 5%, and the mixed solution is added into the stirring tank, and the temperature is 150°C, and the mixture is mixed and stirred for two Hours, the core liquid is ethylene glycol, and the temperature of the cooling liquid is 40°C, and it is spun into a hollow fiber microfiltration membrane with an outer diameter of 1.5MM and a wall thickness of 0.35MM, and the measured flux is 1200L / m 2 .h, 1000L / m after stabilization 2 .h;

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Abstract

The invention provides a method for preparing a hollow fiber microporous membrane by a thermally-induced phase separation method. The method for preparing the hollow fiber microporous membrane by the thermally-induced phase separation method comprises the following steps of: mixing 20 to 60 weight percent of polymer, 70 to 35 weight percent of compound diluent and 5 to 10 weight percent of out-of-phase particles in a mixing and stirring kettle at the high temperature of between 135 and 180 DEG C, and dissolving to form membrane liquid; leading the membrane liquid within the same temperature range into a screw rod extruder metering pump; putting a center pipe into core liquid by using a spinning component so as to spray a hollow fiber into a cooling bath, wherein the temperature of the cooling bath is controlled to be 10 to 60 DEG C; and coiling to obtain a hollow fiber microporous membrane product. The mechanical strength and the water generation amount of the prepared hollow fiber microporous membrane product are enhanced greatly.

Description

technical field [0001] The invention relates to a product manufacturing process of a hollow fiber membrane separation technology, in particular to a method for stretching a hollow fiber prepared by a heat-induced phase separation method. Background technique [0002] Thermally Induced Phase Separation (TIPS for short) is a simple and efficient new method for producing microporous membranes proposed by A.J. Castro in the US Patent (US4247498) in the 1970s. Method; this method is to form a homogeneous solution with some thermoplastic and crystalline high polymers (such as polyolefins) and high-boiling low-molecular compounds (diluents) at high temperatures; when the temperature is lowered, the original homogeneous solution occurs again Solid-liquid or liquid-liquid phase separation, after the solution is solidified, the diluent is removed to become a polymer microporous material. In fact, the diluent is a potential solvent, which is a non-solvent at normal temperature and a s...

Claims

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Application Information

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IPC IPC(8): B01D69/08B01D67/00
Inventor 王冰林金建
Owner 林金建
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