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Reinforced tubular porous body compound film, method of preparing the same and use thereof

A porous body and composite membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as difficulty in improving membrane water permeability, clogging of internal channels of braids, and membrane defects.

Inactive Publication Date: 2008-09-03
BEIJING ORIGINWATER TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The disadvantage of the first four methods mentioned above is that the reinforcing fibers or fiber nets are completely embedded in the membrane, and it is difficult to improve the water permeability of the membrane.
The fifth, sixth, and seventh methods have too strict requirements on the hollow braid. The main problem is that the membrane liquid easily penetrates the braid too much and blocks the internal channel of the braid.
The film produced by the eighth method is prone to defects

Method used

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  • Reinforced tubular porous body compound film, method of preparing the same and use thereof
  • Reinforced tubular porous body compound film, method of preparing the same and use thereof
  • Reinforced tubular porous body compound film, method of preparing the same and use thereof

Examples

Experimental program
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Embodiment

[0061] The hollow braid is woven from 110 polyester monofilaments of 130 decitex, with an inner diameter of 1.0 mm and an outer diameter of 2.2 mm.

[0062] The composition of polymer material membrane liquid I is as follows: 14% by weight of polyvinylidene fluoride, 8% by weight of polyvinylpyrrolidone, 6% by weight of polyethylene glycol, 0.5% by weight of lithium chloride, 1% by weight of Tween, 0.5% by weight of water , 70% by weight of N, N-dimethylacetamide.

[0063] The composition of polymer material film liquid II is as follows: 18% by weight of polyvinylidene fluoride, 9% by weight of polyvinylpyrrolidone, 8% by weight of polyethylene glycol, 1% by weight of lithium chloride, 2% by weight of Tween, 0.5% by weight of water , 61.5% by weight of N,N-dimethylacetamide.

[0064] The composition of the core liquid is: 10% by weight of polyvinylpyrrolidone, and 90% by weight of N,N-dimethylacetamide.

[0065] The composition of the coagulation bath was: 20% by weight of d...

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Abstract

The invention discloses a reinforced tubular porous composite film, as well as a preparation method and an application thereof. The composite film consists of a tubular porous body, a first polymer material film and a second polymer material film. The composite film is obtained by coating the first polymer material film and the second polymer material film on the tubular porous body. The reinforced tubular porous composite film has the advantages of no surface defect, high water permeability, high tensile strength, wide selection range of the tubular porous body and easy production.

Description

【Technical field】 [0001] The invention relates to a reinforced tubular porous body composite membrane, a preparation method and application of the membrane. 【Background technique】 [0002] Membrane separation unit has been widely used in water purification and sewage regeneration because of its high efficiency and energy saving. In large-scale sewage treatment, the membrane is required to have both a certain strength and a certain water permeability. However, the strength of the membrane is contrary to the water permeability, and its strength is proportional to the thickness, while the water permeability is inversely proportional to the thickness. An effective way to solve this contradiction is to make a composite membrane, that is, a membrane composed of a functional layer and a support layer. The functional layer is mainly used for separation, and the support layer is mainly used for reinforcement. There are two main types of membranes: flat plate and hollow fiber. The...

Claims

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Application Information

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IPC IPC(8): B01D69/12C02F1/44
Inventor 文剑平李锁定陈亦力梁辉
Owner BEIJING ORIGINWATER TECH CO LTD
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