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Hybrid ultrafiltration membrane and preparation method thereof

An ultrafiltration membrane and hybridization technology, which is applied in chemical instruments and methods, ultrafiltration, membrane technology, etc., can solve the problems of easy shedding of inorganic materials, avoid membrane defects, make the preparation method simple and easy, and facilitate industrial production Effect

Active Publication Date: 2022-02-25
HAINAN LITREE PURIFYING TECH CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] Based on this, it is necessary to provide a hybrid ultrafiltration membrane and its preparation method for how to avoid the problems of membrane defects and easy shedding of inorganic materials.

Method used

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  • Hybrid ultrafiltration membrane and preparation method thereof

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preparation example Construction

[0026] See figure 1 , the preparation method of the hybrid ultrafiltration membrane of one embodiment of the present invention, comprises the following steps:

[0027] S10, mixing the polymer membrane material, the organic carboxylic acid, the porogen, and the organic solvent to obtain a casting solution, and the casting solution undergoes phase inversion to obtain an original membrane.

[0028] Among them, the polymer membrane material refers to the membrane material used to manufacture the hybrid ultrafiltration membrane. Further, the polymer membrane material is polyvinylidene chloride (PVDF), polyvinyl chloride (PVC) or polyethersulfone (PES). The membranes of these materials have simple preparation process, low cost, good membrane toughness, not easy to break, uniform pore size, and easy maintenance and cleaning.

[0029] Wherein, in the operation of mixing the polymer membrane material, the organic carboxylic acid, the porogen and the organic solvent, the sequence of a...

Embodiment 1

[0052] Take by weighing 25g polyvinylidene fluoride (PVDF) and 5g polylactic acid (PLA), join in the DMF of 100g, stir evenly under heating state, add 5g polyvinylpyrrolidone (PVP) in the mixed solution afterwards, continue to stir until obtaining Clarify the transparent casting solution, stop stirring, and let it stand for a period of time until the air bubbles in the casting solution are removed, and then prepare the original film through the solution phase inversion method, put the original film in clean water, soak DMF and PVP and wait use.

[0053] Weigh 10g calcium chloride (CaCl 2 ) was dissolved in 90g of pure water to make a 10% calcium chloride aqueous solution, then 0.1% sodium hydroxide (NaOH) was added thereto, and stirred evenly for later use.

[0054] Put the prepared original film into the prepared calcium salt solution, take it out after soaking for 4 hours, put it in a blast oven, and dry it at 20°C until the film has a constant weight, then you can get the ...

Embodiment 2

[0057] Take by weighing 25g polyvinyl chloride (PVC) and 5g ethylenediaminetetraacetic acid (EDTA), join in the DMAC of 100g, stir under heating state, add 5g molecular weight afterwards in the mixed solution and be the polyethylene glycol of 6000Da ( PEG), continue to stir until a clear and transparent casting solution is obtained, stop stirring, and let it stand for a period of time until the bubbles in the casting solution are removed, and then the original film is prepared by the solution phase inversion method, and the original film is placed in clean water. Soak DMAC and PEG for use.

[0058] Weigh 30g calcium nitrate (Ca(NO 3 ) 2 ) was dissolved in 70g of pure water to make a 30% calcium nitrate aqueous solution, and then 0.5% sodium bicarbonate (NaHCO 3 ), stir well and set aside.

[0059] Put the prepared original film into the prepared calcium salt solution, take it out after soaking for 6 hours, put it in a blast oven, and dry it at 40°C until the film has consta...

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Abstract

The invention relates to a hybrid ultrafiltration membrane and a preparation method thereof. The preparation method of the hybrid ultrafiltration membrane comprises the following steps: mixing the polymer membrane material, an organic carboxylic acid, a porogen and an organic solvent to obtain a casting solution, and the casting solution undergoes phase inversion to obtain an original membrane; Salt, alkali catalyst and water are mixed to obtain a calcium salt solution; the original membrane is soaked in the calcium salt solution, and after the reaction is complete, it is dried to obtain a hybrid ultrafiltration membrane. The preparation method of the hybrid ultrafiltration membrane according to the technical solution of the present invention, on the one hand, because the preparation of the original membrane and the reaction between the original membrane and the calcium salt are operated independently of each other, there is no material compatibility problem, thereby avoiding the occurrence of phase Capacitance-induced membrane defects; on the other hand, since metal ions are fixed on the organic membrane through chemical bonds, it is not easy to fall off. In addition, the preparation method of the present invention is simple and easy to implement, is convenient for industrial production, and has good application prospects and economic value.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a hybrid ultrafiltration membrane and a preparation method thereof. Background technique [0002] Membrane technology has been widely used in the field of water treatment, resulting in good social and economic benefits. Among them, ultrafiltration membrane plays an important role in water treatment membrane products because of its high separation efficiency and low cost. The ultrafiltration membrane can not only completely remove the pollutants (such as sediment, rust, etc.) Advances in technology in other fields have provided new ideas and solutions. According to different membrane materials, ultrafiltration membranes can be divided into two categories: one is organic membrane, and the other is inorganic membrane. The material of the organic membrane is mainly made of organic polymers (such as PP, PE, PVDF, PVC, etc.). The disadvantages are that the membrane strength is lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/14B01D67/00B01D71/30B01D71/34B01D71/68
CPCB01D71/34B01D71/30B01D71/68B01D67/0002B01D61/145
Inventor 陈忱王俊陈清陈良刚
Owner HAINAN LITREE PURIFYING TECH CO LTD
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