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Semipermeable-membrane supporting material and preparation method thereof

A support material and semi-permeable membrane technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc.

Active Publication Date: 2018-04-17
ZHEJIANG FORST NEW MATERIAL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no combination of fiber dispersion process and papermaking process to prepare a semi-permeable membrane support material with excellent smoothness, no penetration of the semi-permeable membrane solution on the coated surface, and strong adhesion of the semi-permeable membrane.

Method used

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  • Semipermeable-membrane supporting material and preparation method thereof
  • Semipermeable-membrane supporting material and preparation method thereof
  • Semipermeable-membrane supporting material and preparation method thereof

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preparation example Construction

[0030] A preparation method for a semipermeable membrane support material, the method comprising the steps of:

[0031] Step 1: Add fiber raw materials to water to prepare a variety of fiber dispersions with an initial concentration of 0.1wt%-3.0wt%. The fibers include main fibers and binder fibers, and the main body in each fiber dispersion At least one of the fiber content or fiber parameters of the fiber and the binder is different, and the average diameter of the main fibers in the fiber dispersion with a high concentration is not larger than that in the fiber dispersion with a low concentration;

[0032] Step 2: Then adopt a 2-4 stage dispersion process, that is, disperse the various fiber dispersions prepared in step 1 respectively, and then dilute them. After multiple dispersions and dilutions, various online concentrations of 0.05wt%-0.001 wt% of the fiber dispersion, the multi-stage dispersion process, each dilution and dispersion is counted as one level;

[0033] St...

Embodiment 1

[0048] Step 1: Add the main fiber and binder fiber raw materials into water to prepare three kinds of fiber dispersions. The parameters of each fiber dispersion are as follows:

[0049] The first type, in the dispersion, main fiber, 65wt%, PET, melting point 255°C, diameter 7μm, length 6mm; binder fiber, 35wt%, single-component incompletely stretched / oriented polyester fiber, melting point 210°C , 7 μm in diameter, 6 mm in length; the initial dispersion concentration of the fiber is 0.1%, and the online concentration is 0.01wt%;

[0050] The second type, main fiber, 70wt%, PET, melting point 255°C, diameter 7μm, length 6mm; binder fiber, 30wt%, single-component incompletely stretched / oriented polyester fiber, melting point 210°C, diameter 7μm, The length is 6mm; the initial dispersion concentration of the total fiber is 0.1%, and the online concentration is 0.008wt%;

[0051] The third type, main fiber, 70wt%, PET, melting point 255°C, diameter 7μm, length 6mm; binder fiber, ...

Embodiment 2

[0056] Step 1: Add the main fiber and binder fiber raw materials into water to prepare two kinds of fiber dispersions. The parameters of each dispersion are as follows:

[0057] The first type, main fiber, 70wt%, PET, melting point 255°C, diameter 7μm, length 6mm; binder fiber, 30wt%, single-component incompletely stretched / oriented polyester fiber, melting point 210°C, diameter 7μm, The length is 6mm; the initial dispersion concentration of the total fibers is 0.1%, and the concentration on the net is 0.01wt%.

[0058] The second type, main fiber, 70wt%, PET, melting point 255°C, diameter 7μm, length 6mm; binder fiber, 30wt%, single-component incompletely stretched / oriented polyester fiber, melting point 210°C, diameter 7μm, The length is 6mm; the initial dispersion concentration of the total fibers is 0.1%, and the concentration on the Internet is 0.008wt%.

[0059] Step 2: Adopt a two-stage dispersion process, that is, disperse the two kinds of fiber dispersions prepared i...

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Abstract

The invention discloses a semipermeable-membrane supporting material and a preparation method thereof. The semipermeable-membrane supporting material comprises two or more layers of composite structures, and coated surfaces and non-coated surfaces are distinguished; each layer of structure comprises main fiber and adhesive fiber. The semipermeable-membrane supporting material is prepared by adopting a multi-stage dispersion process and a wet-process non-woven cloth method. The prepared semipermeable-membrane supporting material has a more-reasonable structure, has excellent uniformity and smoothness, and can provide stable mechanical property for semipermeable membranes; the ratio of the MD tensile strength to the CD tensile strength of the supporting material is lower than 2.0 to 1.0, andthe smoothness ratio of the coated surfaces to the non-coated surfaces is (1.1 to 1.1)-(4.0 to 1.0). The semipermeable-membrane supporting material and the preparation method disclosed by the invention have the advantages that a semipermeable-membrane solution can be ensured to permeate to the position about 50% of the thickness of the supporting material stably, so that the coating liquid can beprevented from permeating to the non-coated surfaces.

Description

technical field [0001] The invention belongs to the field of wet-laid non-woven fabrics, and in particular relates to a semipermeable membrane support material and a preparation method thereof. Background technique [0002] In seawater desalination, deep purification of drinking water, domestic sewage treatment, drug concentration, hemodialysis, food concentration and other fields, semi-permeable membrane has become an efficient filter material and has received more and more attention, application and promotion. The semi-permeable membrane is composed of synthetic resins such as cellulose resin, polyester resin, polysulfone resin, polyamide resin, and fluororesin. These materials have low body strength and are difficult to maintain for a long time under the rated working conditions of the semi-permeable membrane. Works steadily and cannot be used alone. As a solution, the semi-permeable membrane requires a support material to provide strength when used, that is, it is used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10
CPCB01D69/10
Inventor 李房刘挺周光大林建华
Owner ZHEJIANG FORST NEW MATERIAL RES INST CO LTD
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