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Method for preparing reticular fiber reinforced hollow fiber membrane of polyvinylidene fluoride

A technology of polyvinylidene fluoride and reticular fibers, which is applied in the field of preparation of high-strength hollow fiber membranes, can solve the problems of difficulty in meeting requirements and low strength of polyvinylidene fluoride hollow fiber membranes, and achieve industrial realization and small flow resistance , the effect of high tensile strength

Inactive Publication Date: 2008-06-11
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyvinylidene fluoride hollow fiber membrane prepared by the general method has its strength performance and separation and permeation performance concentrated in the membrane body at the same time. Difficult to meet requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] 1. Take 75g of polyvinylidene fluoride, 385g of N,N-dimethylacetamide, and 40g of polyvinylpyrrolidone, put them into the solvent tank, stir at 60°C for 8 hours, dissolve and let stand for defoaming. Spinning under the conditions of temperature 30°C, pressure 0.25MPa, core fluid flow rate 3ml / min, pulling speed 2ml / min and immersion coagulation with water as a coagulation bath, the temperature of the coagulation bath is 30°C to spin hollow fibers. Its pore diameter is 0.1μm, outer diameter is 1.46mm, wall thickness is 0.28mm, pure water flux is 454.5L / m at 0.1MPa 2 h, burst strength 0.6MPa, tensile strength 0.98MPa, porosity 70%.

[0012] 2. Take 40g of polyvinylidene fluoride, 440g of N,N-dimethylacetamide, and 8g of polyvinylpyrrolidone into the solvent tank, stir at 60°C for 8 hours, dissolve and let it stand for defoaming.

[0013] 3. The hollow fiber membrane prepared in step 1 is braided on the outside of the hollow fiber by weaving equipment. The synthetic fibe...

Embodiment 2

[0016] 1. Prepare the hollow fiber base membrane with the same raw material quality and operating conditions as step 1 in Example 1.

[0017] 2. Take 50g of polyvinylidene fluoride, 425g of N,N-dimethylacetamide, and 25g of polyvinylpyrrolidone into the solvent tank, stir at 60°C for 8 hours, dissolve and let it stand for defoaming.

[0018] 3. The hollow fiber membrane obtained in step 1 is braided externally by weaving equipment. The synthetic fiber is made of 100D / 48F polyester filament, the number of fiber spindles is 16, and the weaving speed is 0.68m / min. Then pass the obtained hollow fiber membrane through the coating solution of step 2, apply it at a temperature of 15°C, and a traction speed of 0.68m / min, and enter the coagulation bath pure water after a 0.25m dry distance, and the coagulation bath temperature is 10 ℃. A mesh fiber-reinforced polyvinylidene fluoride hollow fiber membrane is prepared.

[0019] 4. Soak the obtained hollow fiber membrane in water for 4...

Embodiment 3

[0021] 1. Prepare the hollow fiber base membrane with the same raw material quality and operating conditions as step 1 in Example 1.

[0022] 2. Add 75g of polyvinylidene fluoride, 400g of N,N-dimethylacetamide, and 25g of polyvinylpyrrolidone into the solvent tank, stir at 60°C for 8 hours, dissolve and let it stand for defoaming.

[0023] 3. The hollow fiber membrane obtained in step 1 is braided externally by weaving equipment. The synthetic fiber is made of 100D / 48F polyester filament, the number of fiber spindles is 16, and the weaving speed is 0.68m / min. Then pass the obtained hollow fiber membrane through the coating solution of step 2, apply it at a temperature of 15°C, and a traction speed of 0.68m / min, and enter the coagulation bath pure water after a 0.25m dry distance, and the coagulation bath temperature is 10 ℃. Preparation of reticular fiber-reinforced polyvinylidene fluoride hollow fiber membrane

[0024] 4. Soak the obtained hollow fiber membrane in water f...

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Abstract

The invention discloses a method for preparing intensified netted hollow fiber membrane, belonging to technology for preparing hollow fiber membrane. The process comprises: taking polyvinylidene fluoride as membrane material, N,N-dimethyl formamide as disslovant, polyvinyl pyrrolidon as additive, preparing membrane liquid according to a certain proportion among them; textiling hollow fiber membrane under certain temperature, pressure and dragging speed; braiding net with synthetic fiber out of hollow fiber membrane, putting intensified hollow fiber membrane sequentially through membrane producing liquid and coagulating bath; coating and congealing under certain temperature, pressure and dragging speed, and getting final product. The invention is characterized in that there is no clogging, the flow resistance is small, stretching intensity amounts to 10-50 MPa, bursting strength is 0.5-1 MPa, and the process is continous and easy for industrialization.

Description

technical field [0001] The invention relates to a preparation method of mesh fiber reinforced polyvinylidene fluoride hollow fiber membrane. It belongs to the preparation technology of high-strength hollow fiber membrane. Background technique [0002] Polyvinylidene fluoride is increasingly widely used in membrane separation technology due to its excellent corrosion resistance, solvent resistance, weather resistance and mechanical properties. The hollow fiber membrane prepared by using it as a membrane material is used in wastewater treatment, domestic sewage reuse and reverse osmosis It has good application in water pretreatment. During these processes, the hollow fiber is continuously subjected to the impact of water flow during use and cleaning, so it needs to have high strength to ensure its normal operation, which is especially prominent in the submerged membrane module. However, the polyvinylidene fluoride hollow fiber membrane prepared by the general method has its ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/08B01D71/34
Inventor 李凭力刘杰解利昕王宇新王世昌
Owner TIANJIN UNIV
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