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Preparation of a Hydrophilic High Adhesion Strength Lined PVDF Hollow Fiber Membrane

A high-adhesion and hydrophilic technology, applied in the direction of fiber treatment, fiber type, membrane, etc., can solve the problems of reduced treatment efficiency, low treatment efficiency, poor hydrophilicity of hollow fiber membrane, etc., to increase adhesion strength, improve Adhesion, effect of increasing porosity

Active Publication Date: 2019-07-12
GUANGZHOU INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The hollow fiber membranes in the prior art have some defects: 1. The unsupported polyvinylidene fluoride hollow fiber membrane has a thick skin layer, which is prone to broken wires and low processing efficiency; 2. The inner lining enhances the bonding strength of the hollow fiber membrane separation layer Low, the shedding of the cortex affects the treatment effect and service life; 3. The polyvinylidene fluoride hollow fiber membrane has poor hydrophilicity, and it is easy to absorb pollutants during use, reducing the treatment efficiency and other defects
The bond strength and surface hydrophilicity of the separation layer are two important factors affecting the separation performance of the lining-reinforced hollow fiber membrane. It can be seen that the performance of the hollow fiber membrane in the prior art needs to be further improved

Method used

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  • Preparation of a Hydrophilic High Adhesion Strength Lined PVDF Hollow Fiber Membrane
  • Preparation of a Hydrophilic High Adhesion Strength Lined PVDF Hollow Fiber Membrane
  • Preparation of a Hydrophilic High Adhesion Strength Lined PVDF Hollow Fiber Membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Weigh 14 g of polyvinylidene fluoride, 73 g of dimethylacetamide, 12 g of polyoxyethylene polyoxypropylene ether block copolymer, and 1 g of titanium dioxide, heat to 80 degrees Celsius and stir to promote dissolution. After being completely dissolved, let stand for defoaming for 12 hours. Select a supporting braided lining with an inner diameter of 1 mm, an outer diameter of 1.5 mm, and a cross-sectional weaving aperture with a gradient change (the ratio of the inner and outer apertures of the cross-section is 1:5), and soak it in 1% sodium hydroxide aqueous solution for 3 hours Finally, take it out and dry it, then install the pretreated lining on the spinning machine, adjust the relative position of the lining and the liquid hole of the spinneret to make it coaxial and vertical, and set the water inlet gap of the spinneret to be 5-30cm , spinning with water as an external coagulation bath, rinsing in a clean water rinsing bath for a period of time, and then drying to...

Embodiment 2

[0030] Weigh 17 g of polyvinylidene fluoride, 77 g of dimethylacetamide, 5.5 g of polymethyl methacrylate-g-polyethylene glycol polymer, and 0.5 g of silicon dioxide, and heat to 80 degrees Celsius with stirring to promote dissolution. After being completely dissolved, let stand for defoaming for 12 hours. Select a supporting braided lining with an inner diameter of 1.4 mm, an outer diameter of 2.0 mm, and a cross-sectional weaving aperture with a gradient change (the ratio of the inner and outer apertures of the cross-section is 1:5), soak it in 0.5% sodium hydroxide aqueous solution for 2 hours, and then take it out. Soak it in 2% polyvinylidene fluoride nitrogen methyl pyrrolidone solution for 2 hours, then install it on the spinning machine, adjust the relative position of the lining and the liquid hole of the spinneret to make it coaxial and vertical, set the spray The water-entry gap of the filament head is 5-30 cm, and the spinning is carried out with water as an extern...

Embodiment 3

[0033] Weigh 12 g of polyvinylidene fluoride, 76.5 g of dimethylacetamide, 10 g of polyvinyl alcohol, and 1.5 g of perovskite nanoparticles, and heat to 80 degrees Celsius with stirring to promote dissolution. After being completely dissolved, let stand for defoaming for 12 hours. Select a supporting lining with an inner diameter of 0.7mm, an outer diameter of 1.2mm, and a cross-sectional weaving aperture with a gradient change (the ratio of the inner and outer apertures of the cross-section is 1:5), soak in 3% polyvinylidene fluoride nitrogen methyl pyrrolidone solution for 4h, Then install it on the spinning machine, adjust the relative position of the lining and the liquid hole of the spinneret to make it coaxial and vertical, set the water inlet gap of the spinneret to be 5-30cm, and use water as the external coagulation bath for spinning , rinsing in a clean water rinsing bath for a period of time and then drying to obtain the polyvinylidene fluoride hollow fiber membrane...

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Abstract

The invention relates to the field of preparation of macromolecular hollow fiber microporous membranes, and particularly discloses a preparation method of a PVDF hollow fibrous membrane of a hydrophilic high-adhesion-strength liner. The preparation method comprises the following steps: preparation of a membrane casting solution, selection and pretreatment of a woven liner structure, spinning and aftertreatment. A woven liner with inner and outer apertures changed in a gradient manner is used for supporting a separation layer of the PVDF hollow fibrous membrane; organic / inorganic hydrophilic additives are blended to improve the surface hydrophilicity of the membrane; meanwhile, the woven liner for supporting is treated by an alkaline solution or an organic solvent, so as to effectively clear away oil dirt from the surface of the liner and activate a molecular structure on the surface layer of the woven liner; therefore, the membrane casting solution can be promoted to penetrate into the deep layer of the woven liner for supporting and be mutually combined and adhered with the woven liner for supporting, so as to improve the adhesion strength of the separation layer and the liner. According to the preparation method, the adhesion performance and the pollution resistance of the supporting liner and the surface PVDF separation layer are effectively improved; the service life of the prepared separation membrane is prolonged, and the application range of the separation membrane is enlarged.

Description

technical field [0001] The invention relates to the field of preparation of polymer hollow fiber microporous membranes, in particular to the preparation of a PVDF hollow fiber membrane lined with hydrophilic high adhesion strength. Background technique [0002] Membrane separation technology is widely used in sewage treatment, drinking water purification, separation of food and beverage, and extraction of biomedical active intermediates. Among many separation membranes, hollow fiber ultrafiltration membranes are the most commonly used, with high packing density. The process is simple, the properties of the membrane filaments are stable, and the membrane modules can be flexibly designed and packaged to meet the needs of various applications. Most ultrafiltration and microfiltration adopt the form of hollow fibers. At present, some manufacturers are exploring and developing hollow fiber nanofiltration membranes. And hollow fiber reverse osmosis membrane products. [0003] Com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D69/08B01D69/02B01D67/00D06M11/38D06M15/256D06M101/22
CPCB01D67/0002B01D67/0093B01D69/02B01D69/08B01D71/34B01D2323/02D06M11/38D06M15/256D06M2101/22
Inventor 涂凯陈顺权杨昌玉苗晶
Owner GUANGZHOU INST OF ADVANCED TECH CHINESE ACAD OF SCI