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Preparation method of hydrophilic modified hollow fiber ultrafiltration membrane based on TIPS method

A technology of hydrophilization and ultrafiltration membrane, applied in the field of ultrafiltration membrane, can solve the problems of high cost of raw materials, unsatisfactory antibacterial ability of ultrafiltration membrane, etc., and achieve the effect of improving tensile properties and antibacterial properties

Active Publication Date: 2022-08-05
江苏艾乐膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method must adopt a porogen containing magnesium chloride, so that the preparation of the ultrafiltration membrane is limited by the magnesium chloride product, resulting in a higher raw material cost for the preparation of the product, and the antibacterial ability of the resulting ultrafiltration membrane is not ideal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0027] In certain embodiments, the preparation method of the hydrophilic modified hollow fiber ultrafiltration membrane based on TIPS method comprises the following steps:

[0028] S1: Using polyvinylidene fluoride resin as the polymer raw material, a solvent with a boiling point ≥ 150 °C and a porogen with a boiling point ≥ 200 ° C are mixed to prepare a casting film base liquid; the solvent with a boiling point ≥ 150 ° C is two Methylacetamide; the porogen with a boiling point ≥200°C is a mixture of polyvinylpyrrolidone and polyethylene glycol; the mass percentage of the solvent with a boiling point ≥150°C is calculated as 50-60%, and the boiling point ≥200°C The mass percentage of the porogen is 10-20%, and the balance is high molecular polymer raw materials, and the total amount is 100%;

[0029] S2: take zeolite powder, zinc chloride powder, silver chloride powder and water and mix them evenly, after heating-constant temperature-heating-constant temperature treatment, dry...

Embodiment 1

[0040] The zeolite is directly pulverized and ground to prepare zeolite particles with a particle size of less than 100 nm; then according to the mass ratio, take 0.1% of zinc chloride powder, 0.1% of silver chloride powder, 10% of zeolite particles, the balance is water, and the total mass is 100%, mixed evenly, then heated to 60°C at 5°C / min, treated at a constant temperature for 20 minutes, then heated to 100°C at 15°C / min, kept at a constant temperature for 5 minutes, dried and pulverized, and ground into a modified particle size <9μm granules;

[0041] According to the mass ratio, take 10% of polyvinylpyrrolidone, 20% of polyethylene glycol, 60% of dimethylacetamide, and the balance of polyvinylidene fluoride resin, the total amount is 100%, mixed evenly, and the temperature is 80 ℃ and stirring at 100r / min for 20min to obtain the base liquid for casting film;

[0042] The modifier particles are added to the base liquid of the casting film according to 0.001% of the mass...

Embodiment 2

[0045] The zeolite is directly pulverized and ground to prepare zeolite particles with a particle size of less than 100 nm; then according to the mass ratio, take 3% of zinc chloride powder, 3% of silver chloride powder, 20% of zeolite particles, the balance is water, and the total mass is 100%, mixed evenly, then heated to 60°C at 5°C / min, treated at a constant temperature for 30 minutes, then heated to 100°C at 15°C / min, kept at a constant temperature for 5 minutes, dried and pulverized, and ground into a modified particle size <9μm granules;

[0046] According to the mass ratio, take 10% of polyvinylpyrrolidone, 10% of polyethylene glycol, 50% of dimethylacetamide, and the balance of polyvinylidene fluoride resin, the total amount is 100%, mixed evenly, and the temperature is 80 ℃ and stirring at 100r / min for 20min to obtain the base liquid for casting film;

[0047] The modifier particles are added to the base liquid of casting film according to 0.01% of the mass of the b...

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Abstract

The invention relates to the technical field of ultrafiltration membranes, in particular to a preparation method of a hydrophilic modified hollow fiber ultrafiltration membrane based on a TIPS (Tungsten Inert Polystyrene) method, which comprises the following steps: dissolving polymer raw materials such as polyvinylidene fluoride resin and the like in a high-boiling-point and low-volatility solvent and a pore-forming agent by adopting a solvent with a boiling point of more than or equal to 150 DEG C, a pore-forming agent with a boiling point of more than or equal to 200 DEG C and polyvinylidene fluoride resin; the preparation method comprises the following steps: preparing a homogeneous solution, then meeting the preparation requirements of a TIPS method, adding zinc chloride powder and silver chloride powder into zeolite, uniformly mixing, gradually heating to keep constant temperature, heating to keep constant temperature, drying, crushing and grinding to prepare modifier particles, adding the modifier particles into a membrane casting base solution to prepare a membrane casting solution, and preparing the membrane casting solution into the membrane casting base solution. According to the hollow fiber ultrafiltration membrane prepared by the TIPS method, the surface of the membrane does not have any change after the membrane is continuously stored for one year under the premise of wet membrane storage and no bactericide or preservative, and the hollow fiber ultrafiltration membrane does not have any bacteria or peculiar smell through detection; the elongation at break reaches 320% or above, and the breaking strength is 4.01 MPa or above.

Description

technical field [0001] The invention relates to the technical field of ultrafiltration membranes, in particular to a preparation method of a hydrophilic modified hollow fiber ultrafiltration membrane based on a TIPS method. Background technique [0002] Ultrafiltration membrane is a microporous filtration membrane with a pore size of 0.001-0.1μm. It is used in ultrafiltration separation technology. It has the characteristics of no phase change and low energy consumption at normal temperature and low pressure operation. It is widely used in water treatment, beverages, food, Biomedicine and other fields. Ultrafiltration separation is to use the pressure difference on both sides of the membrane as the driving force, with the ultrafiltration membrane as the medium, through the action of the pressure difference, when the filtrate flows through the membrane surface, the substances larger than the micropore size of the ultrafiltration membrane surface are trapped on the membrane su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D71/02B01D69/12B01D69/08B01D67/00B01D61/14
CPCB01D71/34B01D71/024B01D71/028B01D69/12B01D69/08B01D67/0079B01D61/145B01D2325/48B01D2325/24Y02A20/131
Inventor 徐向东林永慧陈敏
Owner 江苏艾乐膜科技有限公司