Method for preparing double-surface composite flat membrane

A surface composite and flat membrane technology, applied in the field of membrane separation, can solve the problems of not considering the bonding force between the support layer and the coating layer, not considering the anti-pollution performance of non-woven fabrics, and not considering the influence of non-woven fabric membrane filtration performance, etc. , to achieve the effect of improving anti-pollution performance, improving hydrophilicity, and improving interception capacity

Active Publication Date: 2013-10-02
西安金藏膜环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN1730141A discloses a preparation method of a flat polyetherphenol composite film: the coating layer is directly coated on one surface of the support layer non-woven fabric. Although this method obtains a high-strength composite film, it does not consider The binding force between the support layer and the coating layer, without considering the effect of nonwoven properties on membrane filtration performance
Although this method cross-links the non-woven fabric before coating, the resulting composite film is a single-sided coated film, and does not consider the anti-pollution performance of the uncoated surface of the non-woven fabric.

Method used

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  • Method for preparing double-surface composite flat membrane
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Examples

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Embodiment 1

[0029] Stir and dissolve 15wt% polyvinylidene fluoride, 76wt% dimethylacetamide, 6wt% polyvinylpyrrolidone, and 3wt% LiCl at 60°C for 24 hours, and stand at 60°C for 12 hours to obtain the desired homogeneous cast film liquid, spare;

[0030] Clean the polypropylene non-woven fabric with a cleaning agent (the non-woven fabric has a grammage of 15g / m 2 , a polypropylene spun-bonded non-woven fabric with a thickness of 0.15mm), then soak it in a boiled 10wt% NaOH solution for 10min, rinse it with tap water; soak the above-mentioned non-woven fabric in 10% H by volume at normal temperature 2 o 2 After rinsing in tap water for 48 hours, dry it in an oven at 70°C; immerse the above-mentioned non-woven fabric that has been dried after removing spunbond dirt in dimethylacetamide, and wait until the non-woven fabric is completely wet Take it out and immerse it in the prepared casting solution for 10 minutes, then pull it out from the gap between two parallel cylindrical glass rods w...

Embodiment 2

[0034] Stir and dissolve 4wt% polyvinylidene fluoride, 86wt% dimethyl sulfoxide, 7wt% polyvinyl alcohol, and 3wt% LiCl at 20°C for 12 hours, and stand at 20°C for defoaming for 12 hours to obtain the desired homogeneous casting solution ,spare;

[0035] Clean the polypropylene non-woven fabric with a cleaning agent (the non-woven fabric has a grammage of 15g / m 2 , a polypropylene spun-bonded non-woven fabric with a thickness of 0.15mm), then soak it in a boiled 10wt% NaOH solution for 30min, rinse it with tap water; soak the above-mentioned non-woven fabric in 20% H by volume at normal temperature 2 o 2 After rinsing in tap water for 12 hours, dry it in an oven at 70°C; immerse the above-mentioned non-woven fabric that has been dried after removing spunbond dirt in dimethyl sulfoxide, and wait until the non-woven fabric is completely wet Take it out and immerse it in the prepared casting solution for 10 minutes, then pull it out from the gap between two parallel cylindrical ...

Embodiment 3

[0038] Stir and dissolve 10wt% polyvinylidene fluoride, 5wt% cellulose acetate, 75wt% N-methylpyrrolidone, 7wt% polyethylene glycol, 2wt% LiCl, and 1wt% SiO2 at 80°C for 36 hours, then let stand at 80°C to remove Soak for 24 hours to obtain the required homogeneous casting solution and set aside;

[0039] Clean the polypropylene non-woven fabric with a cleaning agent (the non-woven fabric has a grammage of 15g / m 2 , a polypropylene spun-bonded non-woven fabric with a thickness of 0.15 mm), then soak it in a boiled 10wt% NaOH solution for 20 min, and rinse it with tap water; soak the above-mentioned non-woven fabric in 30% H by volume at normal temperature 2 o2 After rinsing in tap water for 24 hours, dry it in an oven at 70°C; immerse the above-mentioned non-woven fabric that has been dried after removing spunbond dirt in N-methylpyrrolidone, and wait until the non-woven fabric is completely wet Take it out, soak it in the prepared casting solution for 20min, pull out the non...

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Abstract

The invention discloses a method for preparing a double-surface composite flat membrane, comprising the following steps: first stirring high-molecular materials, additives, and an organic solvent according to a certain proportion to dissolve to prepare a homogeneous membrane casting solution for subsequent use; removing residual dirt on non-woven fabrics; then carrying out hydrophilization modification on the non-woven fabrics; completely soaking the modified non-woven fabrics in an organic solvent, and then soaking the non-woven fabrics in the membrane casting solution; and finally carrying out immersion-precipitation phase transformation to prepare the composite membrane. According to the invention, the non-woven fabrics are subject to cleaning and modification, thus the hydrophilcity of the non-woven fabrics is improved, and the coalescent resistance between the non-woven fabrics and a coating is reduced, that is, the problem of the coating is easily peeled off in the operation process are solved to some extent. In addition, the method realizes the simultaneous membrane wiping of the two surfaces of the non-woven fabrics, thus the anti-pollution performance and filtering performance of the composite membrane are effectively raised.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and mainly relates to a preparation method of a double-surface composite flat membrane. Background technique [0002] In recent decades, membrane separation technology has been rapidly applied in chemical industry, electronics, medicine, food, printing and dyeing, water treatment and other fields due to its advantages of high efficiency, energy saving, low investment, easy operation and low pollution, especially in the field of water treatment. The application is very extensive. At the same time, polymer membranes, which play a leading role in the field of membrane separation technology, have also received widespread attention. However, the polymer membranes prepared by existing technologies have problems such as inability to increase flux and strength at the same time, poor hydrophilicity, and easy pollution. As an important form of separation membrane, flat membrane also has the ab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/06
Inventor 王磊苗瑞容志勇王旭东吕永涛孟晓荣黄丹曦
Owner 西安金藏膜环保科技有限公司
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