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Method for preparing braided tube/polymer composite hollow fibrous membrane by thermal induced method

A braided tube, heat-induced technology, applied in the direction of membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of easy separation and pollution of the support layer and the coating layer, and achieve a wide range of performance and extended use Long life, effect of reducing binding resistance

Active Publication Date: 2012-07-11
SUZHOU CNPT SOURCETECH ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems existing in the prior art, the present invention proposes to carry out degreasing treatment and chemical modification on the support layer first, and then coats the polymer on the inner and outer surfaces of the braided pipe by padding, so as to fundamentally solve the problem of the support layer and the coating layer. Problems such as easy detachment and easy pollution during use

Method used

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  • Method for preparing braided tube/polymer composite hollow fibrous membrane by thermal induced method
  • Method for preparing braided tube/polymer composite hollow fibrous membrane by thermal induced method
  • Method for preparing braided tube/polymer composite hollow fibrous membrane by thermal induced method

Examples

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Effect test

Embodiment 1

[0044]13wt% polyvinylidene fluoride, 2wt% cellulose acetate, 77wt% dimethylacetamide, 5wt% polyvinylpyrrolidone, 3wt% LiCl were stirred and dissolved at 60°C for 12h, and stood at 60°C for 12h to obtain Homogeneous casting solution ①. Melt and blend 13wt% polyvinylidene fluoride, 80wt% triethyl phosphate, 5wt% polyvinylpyrrolidone, and 2wt% LiCl in a high-temperature-resistant container, heat up to 100°C and stir for 24h, and stand at 100°C for 12h for defoaming. Obtain homogeneous casting liquid ②.

[0045] Such as figure 1 As shown, the PET fiber braided tube (24 yarns, outer diameter 1.2mm, density 40 mesh) was immersed in the decontamination tank 1 filled with boiling NaOH (10wt%) solution for 20min, and then deionized with room temperature Water cleaning; after cleaning, it is immersed in the modification tank 2 filled with the modification solution (trifluoroethyl methacrylate / ethyl acetate is composed according to the volume ratio of 1:5) for 20min, and then passed th...

Embodiment 2

[0053] 10wt% polyvinylidene fluoride, 80wt% dimethylacetamide, 5wt% polyvinyl alcohol, 5wt% SiO 2 Stir and dissolve at 80°C for 24 hours, and let stand at 80°C for defoaming for 24 hours to obtain a homogeneous casting solution ①. 12wt% polyvinylidene fluoride, 8wt% polyethersulfone, 70wt% triethyl phosphate, 6wt% polyvinylpyrrolidone, 2wt% FeCl 3 , 2wt% LiCl was melted and blended in a high-temperature-resistant container, heated to 140°C and stirred for 24 hours, and left to defoam at 140°C for 24 hours to obtain a homogeneous casting solution ②.

[0054] The PET fiber braided tube (24 yarns, outer diameter 1.2mm, density 40 mesh) was immersed in boiling NaOH (15wt%) solution for 10min, and then cleaned with deionized water at room temperature; after cleaning, it was immersed in a modified Curing solution (hexafluorobutyl acrylate + perfluoroheptyl acrylate (1:1) / ethyl acetate according to the volume ratio of 1:10) for 15 minutes, then rolling under the pressure of 0.8MPa, ...

Embodiment 3

[0058] Stir and dissolve 5wt% polysulfone, 85wt% dimethylacetamide, 4wt% polyvinylpyrrolidone, and 6wt% LiCl at 40°C for 36 hours, and stand at 40°C for 24 hours to obtain a homogeneous casting solution ①. 4wt% polyvinylidene fluoride, 6wt% polymethyl methacrylate, 80wt% dioctyl phthalate, 6wt% FeCl 3 , 2wt% polyvinylpyrrolidone and 2wt% LiCl were melted and blended in a high-temperature resistant container, heated to 170°C and stirred for 24h, and left to defoam at 170°C for 48h to obtain a homogeneous casting solution ②.

[0059] The PET fiber braided tube (18 spindle yarns, outer diameter 3.0mm, density 100 mesh) was immersed in boiling NaOH (5wt%) solution for 20min, and then cleaned with deionized water at room temperature; after cleaning, it was immersed in a modified Curing liquid (dodecafluoroheptyl methacrylate / butyl acetate according to the composition of 1:20 volume ratio) for 30min, followed by rolling under the pressure of 0.6MPa, rolling speed 7m / min, after rolli...

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Abstract

The invention discloses a method for preparing braided tube / polymer composite hollow fibrous membrane by a thermal induced method. The method comprises the following steps of: preparing membrane-casting liquid 1 and membrane-casting liquid 2; dipping a polyethylene glycol terephthalate (PET) braided tube in a boiling NaOH solution with certain concentration to remove oil stains remained on the braided tube; modifying the braided tube of a supporting layer with a modifier; coating the high-molecular polymer membrane-casting liquid 1 onto the filament surface of the braided tube by a one-time dipping and one-time rolling method, thermoforming the round tube, and curing the tube in a gel bath; uniformly coating the membrane-casting liquid 2 on the outer surface of the membrane-laminated fibrous braided tube with spinning equipment, and curing composite filaments in cooling liquid; and displacing a diluent from a formed membrane with an extracting agent, and rinsing the membrane filamentsto obtain the braided tube / polymer composite hollow fibrous membrane. The braided tube / polymer composite hollow fibrous membrane prepared by the method has the characteristics of high flux, strength and interception and high-pressure backwash resistance; and moreover, the supporting layer and the coating layer are difficult to separate.

Description

technical field [0001] The invention belongs to the technical field of hollow fiber membrane preparation, in particular to a thermal induction method for preparing a braided tube / polymer composite hollow fiber membrane. Background technique [0002] In recent decades, membrane separation technology has developed rapidly, and has attracted widespread attention for its high efficiency, simple operation, economy, environmental protection, energy saving, and no secondary pollution. It has been widely used in petroleum, biochemistry, medicine, metallurgy, electronics, energy , light industry, textile, food, environmental protection, aerospace, shipping, people's life and other fields have been widely used, and formed an independent emerging technology industry. Membrane separation technology plays a huge role especially in the fields of water resource regeneration and sewage treatment. [0003] Compared with separation membranes of other structures, hollow fiber membranes have t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D71/68B01D67/00
Inventor 王磊黄游孟晓荣孙兵苗瑞周刚容志勇余铭皋吕永涛王旭东柴续斌
Owner SUZHOU CNPT SOURCETECH ENVIRONMENTAL TECH
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