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Production method for internal supporting hollow fiber membrane

A production method and technology of fiber membranes, applied in the production field of inner support hollow fiber membranes, can solve the problems of poor bonding performance and out-of-round cross-section of inner support hollow fiber membranes, and achieve improved roundness, improved bonding performance, Ease of diffusion and penetration

Active Publication Date: 2016-11-16
盐城海普润科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the shortcomings of the existing hollow fiber membranes with internal support such as poor bonding performance and out-of-round cross-section, the purpose of the present invention is to provide a production method for hollow fiber membranes with internal support that is simple in preparation and can be industrialized. Adhesive performance between cortical membrane material and hollow braided rope

Method used

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  • Production method for internal supporting hollow fiber membrane
  • Production method for internal supporting hollow fiber membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) 40g of polyvinylidene fluoride resin with a weight average molecular weight of 400,000, 10g of polyvinylpyrrolidone (K30), 5g of vinyl chloride-vinyl acetate copolymer, and 45g of dimethylformamide were uniformly mixed and stirred at 90°C , dissolve, and obtain a mass concentration of 40% polyvinylidene fluoride casting solution after filtering and defoaming;

[0031] 2) 0.1g of vinyl chloride-vinyl acetate copolymer resin and 99.9g of dimethylformamide were mixed and dissolved at 50°C as the inner coagulation core liquid;

[0032] 3) Combine the cast film solution prepared by step 1) at 80°C, the inner solidified core liquid prepared by step 2) at 40°C (flow rate: 5mL / min), and polyester hollow braided rope (inner diameter: 0.5mm, The outer diameter is 1.2mm) is extruded through the three-layer spinneret at the same time under the condition of 80 ℃, and immediately solidifies in the deionized water of 30 ℃, and then collects the wire at a speed of 2m / min;

[0033] ...

Embodiment 2

[0035] 1) 12g of polyvinyl chloride resin with a degree of polymerization of 3000, 7g of polyethylene glycol (molecular weight 600), 12g of polyvinyl butyral, and 69g of dimethylacetamide were uniformly mixed, stirred, and dissolved at 80°C , after filtering and defoaming, the obtained mass concentration is 12% polyvinyl chloride casting solution;

[0036] 2) 1g of polyvinyl butyral and 99g of dimethylacetamide were uniformly mixed, stirred and dissolved at 40°C as the internal coagulation core liquid;

[0037] 3) Combine the casting solution prepared by step 1) at 70°C, the internally solidified core liquid obtained by step 2) at 40°C (the flow rate is 20mL / min), and the glass fiber hollow braided rope (the inner diameter is 2.2mm, The outer diameter is 3.2mm) is extruded through the three-layer spinneret at the same time under the condition of 70°C, firstly through the dry spinning process of 7cm (the temperature is 24°C, the humidity is 80%RH) and then at 20°C, 40% dimethyl...

Embodiment 3

[0040] 1) 18g of polyethersulfone resin, 16g of polyvinylpyrrolidone (K17), 8g of vinyl chloride-vinyl acetate-vinyl alcohol terpolymer, and 58g of N-methylpyrrolidone were uniformly mixed, stirred and dissolved at 50°C, After filtering and defoaming, a polyethersulfone casting solution with a mass concentration of 18% was obtained;

[0041] 2) 2g of vinyl chloride-vinyl acetate-vinyl alcohol terpolymer and 98g of N-methylpyrrolidone were uniformly mixed and dissolved at 50°C as the internal coagulation core liquid;

[0042] 3) Combine the cast film solution prepared by step 1) at 40°C, the internal solidification core liquid obtained by step 2) at 40°C (flow rate: 15mL / min), and polyethylene hollow braided rope (inner diameter: 1.8mm, The outer diameter is 3.0mm) is extruded through the three-layer spinneret at the same time under the condition of 40°C, and is immediately solidified in 45% N-methylpyrrolidone aqueous solution at 40°C, and then collected at a speed of 10m / min;...

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Abstract

The invention relates to a production method for an internal supporting hollow fiber membrane. Hydrophilic polymer liquid is taken as core liquid, a matrix polymer and a hydrophilic polymer are taken as membrane casting solutions, and the internal supporting hollow fiber membrane is prepared by extruding the core liquid, the membrane casting solutions and a hollow braided rope by virtue of a spinneret and performing consolidation forming. The hydrophilic polymer liquid is taken as the core liquid, so that the roundness of the section of the internal supporting hollow fiber membrane can be improved; due to existence of the core liquid, a consolidation manner for the membrane casting membrane is changed into a double diffusion manner, and internal supporting hollow fiber membranes with different apertures and different rejection performance can be spun at different bidirectional diffusion speeds; in addition, the membrane casting solution also contains the hydrophilic polymer, so that the bonding performance between the hollow braided rope and a skin membrane material can be greatly improved; the prepared internal supporting hollow fiber membrane can be used for an MBR and a submerged ultra-filtration component, the probability of filament breakage and pollution blocking is reduced, and the service life of the membrane is prolonged.

Description

field of invention [0001] The invention relates to a production method of an inner support hollow fiber membrane. Background technique [0002] With the rapid development of my country's economy, water resources have been seriously polluted, which has had a major impact on industrial and agricultural production. Therefore, reducing sewage discharge and reusing water has become an inevitable trend. The traditional sewage treatment process can no longer meet the new requirements. A new technology——membrane water treatment emerged as the times require, and this technology has been increasingly used in water purification and sewage recycling. [0003] In sewage treatment, due to the poor application environment, the requirements for membrane strength are relatively high. The inner support hollow fiber membrane is developed in this way. The inner support hollow fiber membrane is coated with a PVDF filter function layer on a high-strength hollow fiber substrate, that is, the ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00B01D69/10B01D69/08
CPCB01D67/0011B01D69/08B01D69/10B01D71/34B01D2325/36
Inventor 刘必前
Owner 盐城海普润科技股份有限公司
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