Preparation method of hot-method polyvinylidene fluoride hollow fiber membrane for drinking water treatment

A polyvinylidene fluoride, drinking water treatment technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation and other directions, can solve the problems of low strength, poor toughness, short life, etc., to achieve stable performance, outstanding weather resistance The effect of high resistance and high retention

Inactive Publication Date: 2014-03-19
浙江九水生态科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Hollow fiber membranes produced by the traditional non-solvent phase preparation method (referred to as wet method) have low strength and poor toughness, are easy to break during use, and have a short lifespan. They are not suitable for application in large-scale drinking water treatment projects.

Method used

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  • Preparation method of hot-method polyvinylidene fluoride hollow fiber membrane for drinking water treatment
  • Preparation method of hot-method polyvinylidene fluoride hollow fiber membrane for drinking water treatment
  • Preparation method of hot-method polyvinylidene fluoride hollow fiber membrane for drinking water treatment

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preparation example Construction

[0023] The preparation method of the thermal process polyvinylidene fluoride hollow fiber membrane that is used for drinking water treatment that the present invention proposes, comprises the following steps:

[0024] (1) Dry polyvinylidene fluoride and polyethersulfone in a dryer respectively, the drying temperature is 80-90°C, and the drying time is 24-36 hours;

[0025] (2) Preparation of blended polymer solution for membrane production:

[0026] The mass percent of each component in the blended polymer solution is:

[0027]

[0028] After weighing polyvinylidene fluoride, polyethersulfone, polyethylene glycol 400, triethyl phosphate and calcium chloride according to the above ratio, put them in a stirring tank, stir and dissolve at a temperature of 140-155 °C, The stirring time is 14 to 16 hours, and the stirring speed is 90 to 110 rpm to make a uniform blended polymer solution;

[0029] (3) Extrusion and forming of hollow fiber membranes, the specific process is as f...

Embodiment 1

[0052] (1) Pretreatment of polymer materials:

[0053] Dry polyvinylidene fluoride PVDF (molecular weight: 370,000) and polyethersulfone (molecular weight: 50,000) respectively in a dryer at a drying temperature of 85°C.

[0054] (2) Preparation of blended polymer solution:

[0055] The dried polyvinylidene fluoride P 1 , polyethersulfone P 2 , polyethylene glycol 400D1, triethyl phosphate D 2 and additive CaCl 2 After weighing according to the mass percentage, it is placed in the batching kettle, and its mass percentage (wt%) is P 1 :P 2 :D 1 :D 2 :A=25:5:19.5:50:0.5, stirring and dissolving at a temperature of 150°C for 15 hours at a stirring speed of 100 rpm to dissolve into a uniform blended polymer solution;

[0056] (3) Extrusion and forming of hollow fiber membrane:

[0057] (3-1) Send the blended polymer solution in step (2) into the twin-screw extruder through the spinning pump, the feeding speed of the raw material is 15 kg / hour, and the temperature of the 6...

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Abstract

The invention relates to a preparation method of a hot-method polyvinylidene fluoride hollow fiber membrane for drinking water treatment and belongs to the technical field of membrane separation and drinking water treatment. The preparation method comprises the following steps: drying polyvinylidene fluoride and polyether sulfone; proportionally weighing, stirring and dissolving the polyvinylidene fluoride, the polyether sulfone, polyethylene glycol 400, triethyl phosphate and calcium chloride; putting a product into a double-screw extruder for extrusion to form a hollow nascent fiber; cooling and solidifying the nascent fiber in a cold extraction liquid tank; soaking the nascent fiber into ultrapure water, removing a diluent, and performing airing to obtain the polyvinylidene fluoride hollow fiber membrane. According to the method, raw materials are safe, sanitary and environment-friendly, are high in heat resistance, chemical stability, weather resistance, ozone resistance, ultraviolet radiation resistance and chemical corrosion resistance, and are high-end membrane materials for the drinking water treatment with excellent performance; the hot-method polyvinylidene fluoride hollow fiber membrane is high in retention and stable in performance, produced water is good in quality, and when the membrane is used, yarns are not broken.

Description

technical field [0001] The invention relates to a method for preparing a thermal polyvinylidene fluoride hollow fiber membrane used for drinking water treatment, in particular to a method for preparing polyvinylidene fluoride (PVDF) and polyethersulfone by a thermally induced phase separation method (thermal method for short). A (PES) blended hollow fiber membrane is used for municipal drinking water treatment and belongs to the technical field of membrane separation and drinking water treatment. Background technique [0002] my country's existing water sources are generally polluted by organic matter, and some areas have compound pollution such as high organic matter and high turbidity. The traditional coagulation-sedimentation-filtration-disinfection process has low filtration accuracy, high usage of disinfectants and coagulants, and has a great impact on water quality. The treated water cannot meet the requirements of the new national standard 106 drinking water standards...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/08B01D67/00
Inventor 奚韶锋洪耀良陈翠仙
Owner 浙江九水生态科技有限公司
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