Method for preparing fiber braided tube embedded enhanced type polymer hollow fiber microporous membrane

A fiber braided tube and polymer technology, which is applied in the field of polymer separation membrane material preparation and modification, can solve the problem of introducing core liquid into the inner cavity of the braided tube, and achieve good membrane hydrophilicity, high retention, hydrophilicity and Strong anti-pollution effect

Active Publication Date: 2009-09-30
TONGXIANG JIANMIN FILTER MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned several coating technologies all co-extrude the braided fiber braided tube and the casting solution for coating, so it is impossible to introduce the core fluid into the inner cavity of the braided tube

Method used

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  • Method for preparing fiber braided tube embedded enhanced type polymer hollow fiber microporous membrane
  • Method for preparing fiber braided tube embedded enhanced type polymer hollow fiber microporous membrane
  • Method for preparing fiber braided tube embedded enhanced type polymer hollow fiber microporous membrane

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preparation example Construction

[0018] The preparation method of the fiber braided tube embedded in the reinforced polymer hollow fiber microporous membrane of the present invention comprises the following steps:

[0019] 1. Preparation of casting solution: Stir the polymer, solvent, non-solvent, and hydrophilic modifier in a reaction kettle at a temperature of 80-140°C for 12-24 hours, filter, and vacuum defoam for 12-36 hours to obtain Casting solution;

[0020] 2. Fiber braiding and co-extrusion integrated film formation: the casting liquid is extruded into the extrusion mold under the pressure of 0.1-0.4MPa; the core liquid (hollow molding liquid) is passed through the core liquid under the pressure of 0.01-0.05MPa The tube is extruded into the extrusion die by pressure; the fiber bundle on the wire frame of the braiding machine is cross-braided in a "herringbone" shape along the core liquid tube, so that the core liquid tube is fixed in the middle of the braided fiber braided tube, and the fiber braided...

Embodiment 1

[0027] 1. Polyvinylidene fluoride (15% by weight concentration), N, N-dimethylacetamide (70% by weight concentration), polyethylene glycol 600 (10% by weight concentration), polyethylene Pyrrolidone (5% by weight concentration) was stirred in a reaction kettle at a temperature of 90° C. for 12 hours, filtered, and vacuum defoamed for 24 hours to obtain a casting solution;

[0028] 2. Under the pressure of 0.2MPa, the casting liquid is extruded into the extrusion mold by pressure; 2O is used as the core liquid under the pressure of 0.01MPa, and is extruded into the extrusion die through the core liquid tube; "" cross braiding, so that the core liquid tube is fixed in the middle of the braided fiber braided tube, driven by the friction wheel, the fiber braided tube enters the extrusion mold at a forward speed of 3m / min; the casting liquid, core liquid , The fiber braided tube is co-extruded through an extrusion die, immersed in 60°C H 2 Phase separation occurs in O, and fiber ...

Embodiment 2

[0033] The preparation steps are the same as in Example 1.

[0034]

[0035]

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Abstract

The invention discloses a method for preparing a fiber braided tube embedded enhanced type polymer hollow fiber microporous membrane, which is characterized by adopting a fiber-braiding and coextrusion integrative membrane forming process, namely a core liquid tube is fixed in the middle of the braded tube, a fibrous bundle is braided into a fiber braided tube along the core liquid tube, then casting film liquid, core liquid and the fiber braided tube are co-extruded by an extrusion die, and the fiber braided tube embedded enhanced type polymer hollow fiber microporous membrane is prepared bya phase transformation method. The method successfully embeds the fiber braided tube into the body of the hollow fiber microporous membrane and introduces the core liquid into the inner cavity of thebraided tube, and effectively controls the inside diameter of the hollow fiber microporous membrane, so that the technical problems that in the prior coating process of preparing a fiber braided tubeenhanced type hollow fiber membrane, a polymer layer is easy to break away from the fiber braided tube, the hollow fiber inner cavity is easy to be blocked, and the like are solved, thus the polymer hollow fiber microporous membrane with high backwashing pressure, high mechanical strength, high flux, high retention performance and hydrophilic property is obtained.

Description

technical field [0001] The invention belongs to the technical field of preparation and modification of polymer separation membrane materials, and in particular relates to a preparation method of a fiber braided tube embedded reinforced polymer hollow fiber microporous membrane. Background technique [0002] Polymer hollow fiber microporous membrane is an important structural form of polymer separation membrane materials. Its advantages are large specific surface area, high packing density, small volume, high treatment efficiency and simple production process. It has been widely used in water treatment , chemical industry, electronics, medicine, food processing and other fields. Since the inner structure of the polymer hollow fiber membrane is a porous structure, its mechanical strength is not high, and the phenomenon of broken filaments often occurs in practical applications. In order to improve the mechanical strength of polymer hollow fiber membranes, Hayano et al. (US Pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D69/10B01D67/00
Inventor 徐又一计根良尤健明
Owner TONGXIANG JIANMIN FILTER MATERIALS
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