Preparation method of separation membrane composite support body

A technology of composite support and separation membrane, applied in separation methods, filtration separation, semi-permeable membrane separation, etc., can solve the problems of long process, complex process, easy to produce curls, wrinkles, etc., achieve high heat resistance and melting point, and prepare The method is simple and the effect of excellent uniformity

Inactive Publication Date: 2021-03-16
JIANGSU ZANPOD NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] With reference to the public documents CN101765456A and CN103429327A, they all propose a spunbonded fabric made of continuous long fibers and are superimposed with multi-layer spunbonded fabrics and bonded together by thermal bonding to make a substrate non-woven fabric for a reverse osmosis membrane. The non-woven fabrics made by these two different methods are combined into one by multi-layer superimposition, heating and pressing. However, curling and wrinkles are easy to occur when the multi-layers are cured, which affects the uniformity of the product. This multi-layer wet copying Forming method, its process is complicated, the process is long, the cost is high, and after the multi-layer non-woven layer is stacked, there are structural deficiencies and functional defects, which cannot meet the use requirements of the reverse osmosis membrane
[0005] With reference to the public documents CN105040275A and CN106823839A, they adopt a two-layer or three-layer structure, and different layers are composed of synthetic fibers of different raw materials, including polyester fibers, copolyester fibers, ES sheath-core fibers, etc. The melting point and mechanical properties of these fibers , elongation at break are all different, the process is complicated, the uniformity and stability of the product is difficult to guarantee, and the melting point of copolyester fiber, ES skin-core fiber and other materials is low, it is difficult to meet the high temperature curing requirements of the separation membrane
[0006] The reference publication CN102188910A proposes a technology in which the cross-sectional aspect ratio of the main synthetic fiber is 1.2-3.0, 1.4-2.5, but the cross-section of the special-shaped fiber is difficult to produce and control, and the process is complicated, the process is long, and the cost is high

Method used

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  • Preparation method of separation membrane composite support body

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preparation example Construction

[0024] A preparation method for a separation membrane composite support, the preparation method comprising the following steps:

[0025] Step 1. Feed the hollow polyoxadiazole fiber and the high crystallinity polyester fiber in a certain proportion at one time, and decompose to make a slurry, and then purify and remove impurities and then disperse to obtain the slurry;

[0026] Step 2, making, pressing and drying the slurry in sequence to obtain paper sheets;

[0027] Step 3: hot-rolling the paper sheet, and finishing with a calender to obtain a separation membrane composite support.

[0028] The hollow polyoxadiazole fiber mentioned in the above step 1 has a diameter of 10-30um and a length of 2-20mm, and a high crystallinity polyester fiber has a diameter of 5-20um and a length of 2-8mm. To meet the diameter and length requirements, the following conditions must also be met:

[0029] Hollow polyoxadiazole fibers must have at least one of the following characteristics: spec...

Embodiment 1

[0036] Step 1. The hollow polyoxadiazole fiber with a diameter of 20um and a length of 6mm and the high crystallinity polyester fiber with a diameter of 18um and a length of 6mm are fed at a rate of 30%: 70% by mass, and the concentration is 1wt% in the hydraulic In the deflagging machine, decompose to make slurry, then use a cone-shaped impurity remover to purify and remove impurities twice, then disperse, and add a dispersant with a concentration of 0.1wt% during dispersion to obtain a slurry;

[0037] Step 2: Pass the slurry through the stabilizing box to adjust the online head of the slurry. In the headbox, the slurry is evenly distributed on the forming net with a concentration of 0.06wt%. When the slurry runs along the forming net, with the help of couch roll function, the water is filtered out to obtain a wet paper sheet, the wet paper sheet leaves the forming wire, is further dehydrated by pressing, and enters the drying section for drying to obtain a paper sheet;

[0...

Embodiment 2

[0040]In Example 1, the hollow polyoxadiazole fiber with a diameter of 20um and a length of 6mm and the high-crystallinity polyester fiber with a diameter of 18um and a length of 6mm are 30% by mass: 70% and can be replaced by a ratio of 20um in diameter and 6mm in length. The hollow polyoxadiazole fiber with a length of 6 mm and the high crystallinity polyester fiber with a diameter of 18 um and a length of 6 mm are fed at a time in a ratio of 70% by mass: 30%, and the others are the same as in Example 1.

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Abstract

The invention discloses a preparation method of a separation membrane composite support body, which comprises the following steps: 1. feeding hollow polyoxadiazole fibers and high-crystallinity polyester fibers according to a certain ratio at one time, defibering to prepare slurry, purifying, removing impurities, and dispersing to obtain slurry; 2, sequentially papermaking, squeezing and drying onthe pulp, and obtaining paper sheets; and 3, carrying out hot rolling on the paper sheet, and finishing by a calender to obtain the separation membrane composite support body. The preparation methodhas the beneficial effects that the preparation method is simple, the two raw materials are low in cost and easy to obtain, the two raw materials have high heat resistance and melting point, the high-crystallinity polyester fiber can be bonded and melted at high temperature to form a unique hole structure, and meanwhile, enough homogeneity can be kept; and the hollow polyoxadiazole fiber is used as a skeleton to provide enough mechanical strength, and the separation membrane composite support body has excellent uniformity, mechanical strength, heat resistance and air permeability.

Description

technical field [0001] The invention relates to the technical field of wet-laid nonwoven fabrics, in particular to a method for preparing a separation membrane composite support. Background technique [0002] Membrane separation technology has been widely used in gas separation, material separation and water treatment industries. With the rapid development of the domestic economy, people's requirements for water quality are increasing. Among the existing water treatment technologies, membrane separation technology has been obtained Wide range of applications. For example, reverse osmosis membrane technology is used for seawater desalination treatment, industrial water treatment, direct drinking water treatment, etc. [0003] The separation membrane generally adopts a multi-layer structure, and a solution of a high molecular polymer is cast on a support such as a non-woven fabric or a woven fabric, and then cured to form a bottom film, and then a separation membrane is forme...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H27/08D21H13/24D21H13/20D21H15/02B01D69/10
CPCD21H27/08D21H13/24D21H13/20D21H15/02B01D69/10
Inventor 吴萌李敏邓艳梅
Owner JIANGSU ZANPOD NEW MATERIAL CO LTD
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