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A kind of high-strength hollow fiber membrane and its preparation method

A fiber membrane and high-strength technology, applied in the field of composite materials, can solve the problems of uneven physical tensile strength of hollow fiber membranes, insufficient physical tensile strength, easy breaking and deformation of membrane filaments, etc., to achieve increased pure water flux, Improved tensile strength and excellent product performance

Inactive Publication Date: 2016-02-03
宁波绿色方舟环境工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hollow fiber membranes currently on the market are often unsupported in the membrane body layer. For example, the Chinese invention patent (publication number: CN103041712A) discloses the problem that the hollow fiber membrane has insufficient physical tensile strength and the membrane filament is easily broken and deformed. A hollow fiber membrane comprising a membrane body layer and a number of short fibers blended in the membrane body layer
Although the overall strength of the hollow fiber membrane has been greatly improved, the service life is twice that of the hollow fiber without short fibers, but because the short fibers are mixed into the casting solution, the arrangement of the short fibers during spinning to obtain the hollow fiber membrane Irregularity makes the physical tensile strength of the hollow fiber membrane uneven, the strength is uneven, there are still deficiencies, and the membrane filaments are still easy to break and deform

Method used

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  • A kind of high-strength hollow fiber membrane and its preparation method
  • A kind of high-strength hollow fiber membrane and its preparation method
  • A kind of high-strength hollow fiber membrane and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 20% polyvinylidene fluoride (weight percent), 10% polyvinylpyrrolidone and 12% polyoxyethylene (weight percent), 4% lithium chloride (weight percent) and 54% dimethylformamide ( % by weight) mixed to make a mixed solution, the sum of each component is 100%, the mixed solution was fully stirred at 70°C for 10 hours, after stirring, it was pressed into the degassing kettle through a 200-mesh filter under a pressure of 0.2MPa, After filtering, standing still or vacuum defoaming for 20 hours, the casting solution is obtained;

[0034] Twist 50 polyester fibers into reinforcing ribs with a diameter of 0.04mm, take four reinforcing ribs and pre-embed them in the mold, pass the above-mentioned film-making solution through the double-tube spinneret, and combine with the reinforcing ribs pre-embedded in the mold Spray together, and then enter the gel bath to solidify. The outside of the membrane filament is formed by the gel bath, and the inside is formed by the core liquid gel,...

Embodiment 2

[0037]15% polytetrafluoroethylene (weight percent), 18% polyethylene glycol and 7% methylcellulose (weight percent), 2% lithium nitrate (weight percent) and 48% dimethylacetamide ( % by weight) mixed to make a mixed solution, the sum of each component is 100%, the mixed solution was fully stirred at 50°C for 15 hours, and after stirring, it was pressed into the degassing kettle through a 300-mesh filter under a pressure of 0.1MPa. After filtering, standing still or vacuum defoaming for 25 hours, the casting solution is obtained;

[0038] Strand 30 glass fiber filaments into reinforcing ribs with a diameter of 0.03mm, take four reinforcing ribs and pre-embed them in the mold, pass the above-mentioned film-making solution through the double-tube spinneret, and the reinforcing ribs embedded in the mold The ribs are sprayed out together, and then enter the gel bath to solidify. The outside of the membrane filament is formed by the gel bath, and the inside is formed by the core liq...

Embodiment 3

[0041] 23% polyvinyl chloride (weight percentage), 18% polyvinyl alcohol and 2% polyoxyethylene (weight percentage), 6% sodium acetate (weight percentage) and 51% dimethyl sulfoxide (weight percentage) Mix to form a mixed solution, the sum of each component is 100%. The mixed solution is fully stirred at 80°C for 210 hours. After stirring, it is pressed into a degassing kettle through a 400-mesh filter under a pressure of 0.4MPa, filtered, Static or vacuum defoaming for 30 hours to obtain the casting solution;

[0042] Strand 100 carbon fibers into reinforcing ribs with a diameter of 0.05mm, take four reinforcing ribs and pre-embed them in the mold, pass the above-mentioned film-making solution through the double-tube spinneret, and together with the reinforcing ribs pre-embedded in the mold Spray out, then enter the gel bath to solidify, the outside of the membrane filament is formed by the gel bath, and the inside is formed by the core fluid gel, which is used to form the in...

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Abstract

The invention provides a high-strength hollow fiber film and a preparation method thereof, belongs to the technical field of composite materials, and the high-strength hollow fiber film can be used for solving the problems of poor hollow fiber film intensity, high silk breakage and deformation and the like in the prior art. The high-strength hollow fiber film comprises a hollow fiber film wall and four reinforcing ribs symmetrically arranged in the wall, wherein the reinforcing ribs are composed of 25-150 reinforcing fiber silks in a twisting manner, the diameter lengths of the reinforcing ribs are 0.03-0.05mm, and the reinforcing fiber silks are one of polyester fibers, glass fibers, carbon fibers and nylons. The invention provides the preparation method of the high-strength hollow fiber film, the high-strength hollow fiber film has the good property and particularly has the strong compression resistance, rupturing tensile strength and water passing volume, the tensile strength can achieve 20N and is more than 5 times of that of the hollow fiber film without the reinforcing ribs, the high-strength hollow fiber film is not deformed under the pressure of 1.8-3MPa, and the service life of the hollow fiber film is greatly prolonged.

Description

technical field [0001] The invention relates to a hollow fiber membrane, in particular to a high-strength hollow fiber membrane and a preparation method thereof, and belongs to the technical field of composite materials. Background technique [0002] With the rapid development of my country's economy, water resources have become more and more restrictive factors for economic development. Therefore, it has become an inevitable trend to reduce sewage discharge and recycle water. The traditional sewage regeneration treatment technology has the disadvantages of low water quality, large land occupation, poor stability, etc., and can no longer meet the new requirements. A new process-membrane water treatment has emerged as the times require, and this process has been increasingly used. For water purification and sewage recycling. Membrane separation technology has the advantages of low energy consumption, simple process, high separation efficiency, and no environmental pollution....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/08B01D67/00
Inventor 孔雷军
Owner 宁波绿色方舟环境工程有限公司