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

A technology of braided tube and polymer, which is applied in the field of braided tube/polymer composite hollow fiber membrane prepared by thermal induction method, can solve the problems of easy pollution, easy detachment of support layer and coating layer, etc., so as to prolong service life and improve performance Broad, reduced binding resistance effect

Active Publication Date: 2013-10-16
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 induction method
  • Method for preparing braided tube/polymer composite hollow fibrous membrane by thermal induction method
  • Method for preparing braided tube/polymer composite hollow fibrous membrane by thermal induction method

Examples

Experimental program
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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 left standing at 60°C for 12h to obtain Homogeneous casting film①. Melt blend 13wt% polyvinylidene fluoride, 80wt% triethyl phosphate, 5wt% polyvinylpyrrolidone, and 2wt% LiCl in a high-temperature container. The temperature is raised to 100°C and stirred for 24h, and it is left standing at 100°C for 12h. A homogeneous casting liquid ② is obtained.

[0045] Such as figure 1 As shown, the PET fiber braided tube (24-spindle yarn, outer diameter 1.2mm, density 40 mesh) was immersed in the decontamination tank 1 filled with boiling NaOH (10wt%) solution for 20 minutes, and then deionized at room temperature Wash with water; after washing, immerse it in the modification tank 2 containing the modification solution (comprising of trifluoroethyl methacrylate / ethyl acetate according to the volume ratio of 1:5) for 20 m...

Embodiment 2

[0053] Combine 10wt% polyvinylidene fluoride, 80wt% dimethylacetamide, 5wt% polyvinyl alcohol, 5wt% SiO 2 Stir and dissolve at 80°C for 24h, and stand still at 80°C for 24h to defoam to obtain a homogeneous casting solution①. Combine 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 24h, and left standing at 140°C for 24h to defoam to obtain a homogeneous casting liquid ②.

[0054] The PET fiber braided tube (24-spindle yarn, outer diameter 1.2mm, density 40 mesh) is immersed in a boiling NaOH (15wt%) solution for 10 minutes, and then washed with deionized water at room temperature; after washing, it is immersed in the modified In the liquid (hexafluorobutyl acrylate + perfluoroheptyl acrylate (1:1) / ethyl acetate in a volume ratio of 1:10) for 15 minutes, then rolling under a pressure of 0.8 MPa at a roll...

Embodiment 3

[0058] 5wt% polysulfone, 85wt% dimethylacetamide, 4wt% polyvinylpyrrolidone, 6wt% LiCl were stirred and dissolved at 40°C for 36h, and allowed to stand at 40°C for 24h to defoam to obtain a homogeneous casting solution①. 4wt% polyvinylidene fluoride, 6wt% polymethyl methacrylate, 80wt% dioctyl phthalate, 6wt% FeCl 3 , 2wt% polyvinylpyrrolidone and 2wt% LiCl were melt blended in a high temperature container, heated to 170°C and stirred for 24h, and left standing at 170°C for 48h to defoam to obtain a homogeneous casting liquid ②.

[0059] Immerse the PET fiber braided tube (18 spindles of yarn, outer diameter of 3.0mm, density of 100 mesh) in boiling NaOH (5wt%) solution for 20 minutes, and then wash with deionized water at room temperature; after washing, immerse it in the modified In a hot liquid (dodecafluoroheptyl methacrylate / butyl acetate in a volume ratio of 1:20) for 30 minutes, then rolling at a pressure of 0.6 MPa, a rolling speed of 7 m / min, and a temperature of 170 ℃ af...

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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 filaments to 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, and particularly relates 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. It has received 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, and energy. , Light industry, textiles, food, environmental protection, aerospace, shipping, people’s lives and other fields have been widely used, and formed an independent emerging technology industry. Membrane separation technology plays a huge role especially in the regeneration of water resources and sewage treatment. [0003] Compared with separation membranes of other structures, hollow fiber membranes hav...

Claims

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Application Information

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Patent Type & Authority Patents(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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