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Preparation method of composite hollow fiber membrane

A fiber membrane and hollow technology, applied in the field of polymer material preparation, can solve the problems of difficult control of separation pore size, narrow selection range of composite materials and solvents, and high post-treatment process requirements, and achieves easy industrialization implementation, excellent anti-pollution performance, and technology. The effect of easy control of the process

Inactive Publication Date: 2014-01-22
滁州品创生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are: 1. The selection range of composite materials and solvents is narrow; 2. The post-treatment process requires high requirements; 3. The separation pore size is not easy to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation method of composite hollow fiber membrane comprises the following steps:

[0026] Step 1: Preparation of casting solution; stirring and blending polymer materials, solvents, additives and chemical reaction porogens at a temperature of 55°C for 10 hours, and standing at a constant temperature of 55°C for defoaming for 20 hours to obtain a homogeneous casting film liquid; the casting solution is prepared according to the following mass percentages of raw materials: the mass ratio of polyvinylidene fluoride, polymethyl methacrylate, and poly-p-phenylene terephthalamide is 5:1:1 , 15%, a mixture of fumaric acid and citric acid at a mass ratio of 1:5, 18%, N,N-dimethylformamide 60%, polyvinylpyrrolidone, lithium chloride and dodecylaminopropyl The mass ratio of acid is 1:2:2, 7%.

[0027] Step 2: Prepare core liquid and outer gel bath; the core liquid is dimethylacetamide with a volume fraction of 60%, the flow rate of the core liquid is 6ml / min, the tempera...

Embodiment 2

[0031] The preparation method of composite hollow fiber membrane comprises the following steps:

[0032] Step 1: Prepare the casting solution; stir and blend polymer materials, solvents, additives and chemical reaction porogens at a temperature of 70°C for 20 hours, and stand at a constant temperature at 70°C for 20 hours to obtain a homogeneous casting film liquid; the casting liquid is prepared according to the following mass percentage of raw materials: polyvinylidene fluoride, polymethyl methacrylate, poly-p-phenylene terephthalamide in a mass ratio of 5:2:2 , 25%, a mixture of fumaric acid and citric acid at a mass ratio of 1:5, 5%, N, N-dimethylacetamide 65%, polyvinylpyrrolidone, lithium chloride and dodecylaminopropyl The mass ratio of acid is 1:2:5, 5%.

[0033] Step 2: Prepare core liquid and outer gel bath; the core liquid is dimethylacetamide with a volume fraction of 60%, the flow rate of the core liquid is 12ml / min, the temperature of the core liquid is 55°C, an...

Embodiment 3

[0037] The preparation method of composite hollow fiber membrane comprises the following steps:

[0038] Step 1: Prepare the casting solution; stir and blend polymer materials, solvents, additives and chemical reaction porogens at a temperature of 60°C for 10 hours, and stand at a constant temperature at 60°C for 20 hours to obtain a homogeneous casting film liquid; the casting solution is prepared according to the following mass percentage of raw materials: polyvinylidene fluoride, polymethyl methacrylate, poly-p-phenylene terephthalamide in a mass ratio of 5:3:3 , 15%, a mixture of fumaric acid and citric acid at a mass ratio of 1:5 6%, N,N-dimethylformamide and N,N-dimethylacetamide at a mass ratio of 1:1 The resulting mixture is 75%, and the mass ratio of polyvinylpyrrolidone, lithium chloride and dodecylalanine is 1:2:4, 4%.

[0039] Step 2: Prepare core liquid and outer gel bath; the core liquid is dimethylacetamide with a volume fraction of 60%, the flow rate of the co...

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PUM

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Abstract

The invention relates to a preparation method of a composite hollow fiber membrane. The preparation method is characterized by comprising the following steps of preparing casting membrane liquid; preparing core liquid and an outer coagulation bath; spinning hollow fibers: utilizing dry-wet spinning equipment to inject the core liquid and the casting membrane liquid into a spinning nozzle together, and extracting the core liquid and the casting membrane liquid from the spinning nozzle together, thus preparing hollow fiber membrane silk; after passing the hollow fiber membrane silk obtained in the previous step through a 0-25cm dry spinning line, enabling the hollow fiber membrane silk to enter a first coagulation bath and a second coagulation bath in sequence to undergo coagulation phase conversion, thus forming a polymer hollow fiber porous membrane with micropore canals. The composite membrane technology is adopted in the preparation method of the composite hollow fiber membrane, so that the composite hollow fiber membrane with stable performance, appropriate pore diameter, high water flux and high strength can be spun. The preparation method has the beneficial effects that the whole technological process is easy to control, the cost is low, and industrialization is easy to implement.

Description

technical field [0001] The invention belongs to the field of polymer material preparation, and in particular relates to a preparation method of a high-strength, high-flux composite hollow fiber membrane. Background technique [0002] Hollow fiber membranes are mainly used for filtration or dialysis in various fields. The composite membrane design can be used to study and select the separation composite layer membrane material and base membrane material, and it is easy to obtain a separation membrane with high separation function and high permeation flux. Therefore, composite membrane technology has become one of the high-function separation membrane preparation technologies. important direction of development. [0003] The early composite hollow fiber membrane technology is to form a composite membrane on the surface of the formed hollow fiber membrane by solution coating method or surface reaction. There are reports on this aspect both at home and abroad. The disadvantage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/08B01D67/00
Inventor 殷翠萍殷丽
Owner 滁州品创生物科技有限公司
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