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Hollow polyester fiber microporous membrane and preparation method thereof

A technology of microporous membrane and fiber membrane, which is applied in the field of membrane separation to achieve the effects of high tensile strength, convenient operation and less pollutant discharge

Inactive Publication Date: 2011-02-02
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the thermally induced phase separation mechanism was proposed in the early eighties of the 20th century, there have been some reports on the preparation of polymer microporous materials and flat membranes by thermally induced phase separation, such as U.S. patents (patent numbers: US3423491, US4020230, US4247498, US4490431, US4726989) and Chinese patent (Patent No.: CN1265048A) have reported the technology of polyethylene, polypropylene, polyvinylidene fluoride hollow fiber or flat microporous membrane prepared by thermal phase separation principle respectively, but prepared by this method Reports of porous polyesters are rare

Method used

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  • Hollow polyester fiber microporous membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A method for preparing a polyester hollow fiber microporous membrane of the present invention is characterized in that the preparation steps are as follows: the formula ratio is calculated by mass percentage:

[0036] (1) Preparation of film-making liquid melt: the molecular weight 5 × 10 5 , 15% polyethylene terephthalate and 85% dimethyl malonate are mixed, the mixed solution is added to the melting material kettle, filled with 0.2MPa nitrogen protection, stirring continuously, and the material is heated to 150°C, After melt blending for 5 hours, stand at 150°C for 30 minutes to degas to obtain a film-forming liquid melt;

[0037] (2) Preparation of the hollow fiber membrane precursor: take dimethyl malonate at 70°C as the core liquid, and the flow rate of the core liquid is 0.2m / s. The spinneret of the spinning machine at 140°C is extruded into a hollow fiber-shaped liquid film. The hollow fiber-shaped liquid film passes through a 10 cm long air gap and enters a col...

Embodiment 2

[0041] A method for preparing a polyester hollow fiber microporous membrane of the present invention is characterized in that the preparation steps are as follows: the formula ratio is calculated by mass percentage:

[0042] (1) Preparation of film-making liquid melt: the molecular weight of 1 × 10 4 , 60% poly(trimethylene terephthalate) and 40% dibutyl phthalate are mixed, the mixture is added to the melting tank, filled with 0.2MPa nitrogen protection, stirring continuously, heating the material to 240°C, melting After blending for 5 hours, stand at 210°C for 30 minutes to degas to obtain a film-forming liquid melt;

[0043] (2) Preparation of hollow fiber membrane precursor: take dibutyl phthalate at 120°C as the core liquid, and the flow rate of the core liquid is 0.2m / s. The spinneret of the spinning machine at ℃ is extruded into a hollow fiber-shaped liquid membrane, and the hollow fiber-shaped liquid membrane enters a 20°C cold water bath to solidify into a hollow fib...

Embodiment 3

[0047] A method for preparing a polyester hollow fiber microporous membrane of the present invention is characterized in that the preparation steps are as follows: the formula ratio is calculated by mass percentage:

[0048] (1) Preparation of film-making liquid melt: the molecular weight of 2 × 10 5 , 25% polybutylene terephthalate and 75% diethyl terephthalate are mixed, the mixture is added to the melt tank, filled with 0.2MPa nitrogen protection, stirring continuously, and the material is heated to 200°C , after melting and blending for 5 hours, standing at 190°C for 30 minutes to degas to obtain a film-forming liquid melt;

[0049] (2) Preparation of the hollow fiber membrane precursor: take diethyl terephthalate at 80°C as the core liquid, and the flow rate of the core liquid is 0.2m / s, and melt the core liquid and the membrane-making liquid prepared in step (1) Together, they are extruded into a hollow fiber-shaped liquid membrane through the spinneret of a spinning ma...

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Abstract

The invention relates to a preparation method of a hollow polyester fiber microporous membrane, which belongs to the technical field of membrane separation. The preparation method comprises the following steps of: mixing a polyester and a diluent to form mixed liquid; performing melt blending, standing and degassing to obtain a membrane-making liquid melt; extruding the diluent serving as core liquid and the membrane-making liquid melt by using a spinning jet to prepare a hollow fiber liquid membrane; after the liquid membrane passes through an air gap, solidifying the liquid membrane in a cold bath, and performing hollow molding to prepare a hollow fiber membrane precursor; soaking the hollow fiber membrane precursor into an extractant and drying to prepare the hollow polyester fiber microporous membrane. In the hollow polyester fiber microporous membrane, the porosity is 45 to 80 percent and the average aperture is 0.05 to 5.0 mu m. The hollow polyester fiber microporous membrane has the characteristics of simple preparation process, easily-controlled membrane structure, high flux and porosity, high mechanical strength and the like, and is a high-performance and low-cost filtering membrane material for water treatment.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a polyester hollow fiber microporous filter membrane material and a preparation method thereof. Background technique [0002] Membrane separation technology has been widely used in food, medicine, biology, Environmental protection, chemical industry, metallurgy, energy, petroleum, water treatment, electronics and other fields have become one of the most important means in today's separation science. Membrane materials are the core basic materials of membrane separation technology. At present, among the two types of membrane materials, inorganic membranes (mainly ceramic membranes and metal membranes) and organic polymer membranes, polymer membranes occupy a dominant position. At present, the polymer hollow fiber microporous membranes that have been commercialized are mostly made of polysulfone (PS), polyvinylidene fluoride (PVDF), polyethersulfone (PES), ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/48B01D69/08
Inventor 张春芳白云翔
Owner JIANGNAN UNIV
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