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A kind of preparation method of positively charged nanofiltration membrane

A nanofiltration membrane and positively charged technology, which is applied in the field of membrane separation, can solve problems such as difficult industrial continuous production and environmental pollution of composite nanofiltration membranes, and achieve easy continuous production, no environmental pollution, and improved loss resistance and stability effects

Active Publication Date: 2020-09-18
BEIJING ORIGIN WATER FILM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cross-linking time required by this method is 5 hours. Long-term cross-linking makes it difficult to achieve industrial continuous production of the composite nanofiltration membrane, and there are also environmental pollution problems caused by the use of organic solvents.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Embodiment 1: Preparation of positively charged nanofiltration membrane

[0067] The implementation steps of this embodiment are as follows:

[0068] A. Preparation of pretreatment basement membrane

[0069] Prepare a polyvinyl alcohol aqueous solution with a concentration of 0.1% by weight and a Tween aqueous solution with a concentration of 0.1% by weight; the polyvinyl alcohol aqueous solution and the Tween aqueous solution are mixed uniformly at a volume ratio of 1:0.8 to obtain an intermediate layer coating solution; Then, according to the coating amount of the intermediate layer coating liquid 34g / m 2 , the intermediate layer coating solution is evenly coated on the porous support layer of polysulfone flat ultrafiltration membrane under the conditions of temperature 20°C and relative air humidity of 58%, and dried for 10min under the condition of temperature 80°C to obtain the described The pretreatment basement membrane;

[0070] B. Preparation of Coating Solu...

Embodiment 2

[0076] Embodiment 2: Preparation of positively charged nanofiltration membrane

[0077] The implementation steps of this embodiment are as follows:

[0078] A. Preparation of pretreatment basement membrane

[0079] Prepare a polyvinyl alcohol aqueous solution with a concentration of 0.2% by weight and a Tween aqueous solution with a concentration of 0.2% by weight; the polyvinyl alcohol aqueous solution and the Tween aqueous solution are mixed uniformly at a volume ratio of 1:1.0 to obtain an intermediate layer coating solution; Then, according to the coating amount of the intermediate layer coating liquid 40g / m 2 , the intermediate layer coating solution is evenly coated on the porous support layer of the polyacrylonitrile flat ultrafiltration membrane under the conditions of a temperature of 22° C. and a relative air humidity of 55%, and is dried for 20 minutes under the condition of a temperature of 80° C. to obtain The pretreatment basement membrane;

[0080] B. Prepara...

Embodiment 3

[0086] Embodiment 3: Preparation of positively charged nanofiltration membrane

[0087] The implementation steps of this embodiment are as follows:

[0088] A. Preparation of pretreatment basement membrane

[0089] Prepare a polyvinyl alcohol aqueous solution with a concentration of 0.3% by weight and a Tween aqueous solution with a concentration of 0.3% by weight; the polyvinyl alcohol aqueous solution and the Tween aqueous solution are mixed uniformly at a volume ratio of 1:1.2 to obtain an intermediate layer coating solution; Then, according to the coating amount of the intermediate layer coating liquid 43g / m 2, uniformly coating the intermediate layer coating solution on the polyvinylidene fluoride flat ultrafiltration membrane porous support layer at a temperature of 30°C and a relative air humidity of 65%, and drying at a temperature of 70°C for 20 minutes, Obtain the pretreatment basement film;

[0090] B. Preparation of Coating Solution

[0091] 3 parts by weight o...

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Abstract

The invention relates to a preparation method of a positively charged nanofiltration membrane. The preparation method comprises the steps of preparation of a pretreatment base membrane, preparation of a coating solution, coating and solidifying. The positively charged nanofiltration membrane has good stability and leaching resistance. According to the preparation method, the charge performance and the hydrophilic-hydrophobic property of the positively charged nanofiltration membrane can be improved through adjusting components and proportions of a copolymer monomer and the water flux of the positively charged nanofiltration membrane can be effectively improved. The preparation method of the positively charged nanofiltration membrane is simple, the production cost is low, the used functional polymer material is simple and available and has a good industrial application prospect.

Description

【Technical field】 [0001] The invention belongs to the technical field of membrane separation. More specifically, the present invention relates to a method for preparing a positively charged nanofiltration membrane. 【Background technique】 [0002] Membrane separation technology has gradually developed into a new type of material separation and purification method due to its characteristics of small investment, small footprint, no pollution, high efficiency, and energy saving. Among them, nanofiltration, as a new pressure-driven membrane separation process, has become a hot spot in the research of membrane separation technology. Nanofiltration is a membrane separation technology between reverse osmosis and ultrafiltration developed after the 1980s. It was called "low pressure reverse osmosis" or "loose reverse osmosis" separation technology in the early days. The molecular weight cut-off of the nanofiltration membrane is 200-2000Da, which is suitable for separating nano-scal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/12
CPCB01D67/0016B01D69/02B01D69/12B01D2325/16
Inventor 陈亦力张庆磊彭文娟李锁定卞玲玲汪洋
Owner BEIJING ORIGIN WATER FILM TECH
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