High-stability hollow fibrous membrane and preparation method thereof

A high-stability, fiber-membrane technology, applied in the field of composite materials, can solve problems such as poor stability, low retention rate, and poor tensile strength, and achieve the effects of improved stability, simple process, and easy control

Active Publication Date: 2013-07-03
ZHEJIANG CHANGXING CREFLUX MEMBRANE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the defects of poor tensile strength, low rejection rate and poor stability in the prior art hollow fiber membrane, the presen

Method used

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  • High-stability hollow fibrous membrane and preparation method thereof

Examples

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Comparison scheme
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Example Embodiment

[0021] Example 1

[0022] A high-stability hollow fiber membrane includes polyvinylidene fluoride membrane filaments, and cross-linked products are uniformly inlaid inside the polyvinylidene fluoride membrane filaments and the pores. The cross-linked product is formed by cross-linking polyvinyl alcohol and glutaraldehyde.

[0023] A method for preparing hollow fiber membranes with high stability, such as figure 1 The process flow shown includes the following steps:

[0024] 1) Prepare polyvinyl alcohol and water into an aqueous solution of polyvinyl alcohol with a concentration of 15% by mass;

[0025] 2) Take 30g of polyvinyl alcohol aqueous solution and add it to 500ml of dimethylacetamide, maintain the temperature at 65°C, stir evenly, then add 150g of polyvinylidene fluoride powder, continue to maintain the temperature at 65°C and stir evenly;

[0026] 3) Add 20g of the pore-forming agent PVP and 10g of the surfactant Tween 80 to the mixture obtained in step 2), stir evenly and po...

Example Embodiment

[0034] Example 2

[0035] A high-stability hollow fiber membrane includes polyvinylidene fluoride membrane filaments, and cross-linked products are uniformly inlaid inside the polyvinylidene fluoride membrane filaments and the pores. The cross-linked product is formed by cross-linking polyvinyl alcohol and glutaraldehyde.

[0036] A method for preparing hollow fiber membranes with high stability, such as figure 1 The process flow shown includes the following steps:

[0037] 1) Prepare polyvinyl alcohol and water into a polyvinyl alcohol aqueous solution with a concentration of 18% by mass;

[0038] 2) Take 40g of polyvinyl alcohol aqueous solution and add it to 500ml of dimethylacetamide, maintain the temperature at 75℃, stir well, then add 160g of polyvinylidene fluoride powder, continue to maintain the temperature at 75℃ and stir evenly;

[0039] 3) Add 40g of the pore-forming agent PVP and 20g of the surfactant Tween 80 to the mixture obtained in step 2), stir evenly and pour it in...

Example Embodiment

[0046] Example 3

[0047] A high-stability hollow fiber membrane comprises polyvinylidene fluoride membrane filaments, and cross-linked products are uniformly inlaid in the inside and pores of the polyvinylidene fluoride membrane filaments. The cross-linked product is formed by cross-linking polyvinyl alcohol and glutaraldehyde.

[0048] A method for preparing hollow fiber membranes with high stability, such as figure 1 The process flow shown includes the following steps:

[0049] 1) Prepare polyvinyl alcohol and water into an aqueous solution of polyvinyl alcohol with a concentration of 14% by mass;

[0050] 2) Take 35g of polyvinyl alcohol aqueous solution and add it to 500ml of dimethylacetamide, maintain the temperature at 85°C, stir evenly, then add 170g of polyvinylidene fluoride powder, continue to maintain the temperature at 85°C and stir evenly;

[0051] 3) Add 30g of the pore-forming agent PVP and 15g of the surfactant Tween 80 to the mixture obtained in step 2), stir evenly...

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Abstract

The invention relates to the technical field of composite materials, in particular to a high-stability hollow fibrous membrane which comprises polyvinylidene fluoride membrane yarns; and crosslinked products are uniformly embedded inside the polyvinylidene fluoride membrane yarns and in the apertures. The invention further discloses a preparation method of the high-stability hollow fibrous membrane. The preparation method comprises the following steps: allocating PVA water solution; allocating membrane casting liquid and defoaming; allocating core liquid; and spinning to prepare the membrane, wherein during the spinning process, PVA in the membrane casting liquid is crosslinked with glutaraldehyde in the core liquid to cause the crosslinked products to exist in the hollow fibrous membrane stably. The crosslinked products uniformly embedded inside the polyvinylidene fluoride membrane yarns and in the apertures adopt uniform and compact structures, and exist in the hollow fibrous membrane stably, so that the tensile strength, the reject rate and the stability of the membrane yarns are improved. The preparation method has the advantages of simple, safe, efficient and easily-controlled process.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a highly stable hollow fiber membrane and a preparation method thereof. Background technique [0002] Traditional sewage regeneration treatment technology has disadvantages such as low water quality, large land occupation, and poor stability. Membrane separation technology has the advantages of low energy consumption, simple process, high separation efficiency, and no environmental pollution. It is an important high-tech solution to contemporary energy, resource and environmental problems. It cannot be replaced by any other chemical separation technology. Its application has been It has been involved in chemical, food, pharmaceutical, biochemical, environmental protection and other fields, and has made important contributions to energy conservation, efficiency improvement, and environmental purification. [0003] However, the existing hollow fiber membranes general...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D67/00B01D69/08
Inventor 郑子龙包进锋张星星
Owner ZHEJIANG CHANGXING CREFLUX MEMBRANE TECH CO LTD
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