Semipermeable membrane supporting body and manufacturing method thereof

A manufacturing method and semi-permeable membrane technology, which is applied in semi-permeable membrane separation, chemical instruments and methods, permeation/dialysis water/sewage treatment, etc., can solve the problem of inability to disperse uniformly, prevent semi-permeable membrane solution from penetrating, melting, etc. question

CN102188910AActive Publication Date: 2011-09-21MITSUBISHI PAPER MILLS LTD
17 Cites 31 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2011-09-21

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

A task of the invention is to provide a semipermeable membrane supporting body which has excellent smoothness on a semipermeable membrane coating surface and can not be permeated by the semipermeable membrane solution. The semipermeable membrane supporting body is characterized in that the semipermeable membrane supporting body is composed of non-woven fabric which comprises more than two main synthetic fiber and adhesive synthetic fiber with different fiber diameters and is provided with the semipermeable membrane coating surface and a semipermeable membrane non-coating surface. In a thickness direction when observed from a cross section SEM of the non-woven fabric, a cross section aspect ratio (long diameter / short diameter of the cross section of the fiber) of the main synthetic fiber in a range between a surface and 1 / 3 part of the semipermeable membrane coating surface and / or a cross section aspect ratio (long diameter / short diameter of the cross section of the fiber) of the main synthetic fiber in a range between a surface and 1 / 3 part of the semipermeable membrane non-coating surface are 1.2-3.0.
Need to check novelty before this filing date? Find Prior Art

Description

Technical field

[0001] The present invention relates to a semipermeable membrane support and a manufacturing method of the semipermeable membrane support. Background technique

[0002] Semi-permeable membranes are widely used in the fields of desalination of seawater, water purification, food concentration, wastewater treatment, blood filtration, and ultrapure water production for medical use and semiconductor cleaning. The semipermeable membrane is composed of synthetic resins such as cellulose resin, polysulfone resin, polyacrylonitrile resin, fluorine resin, polyester resin, polyamide resin, and polyimide resin. However, the semipermeable membrane monomer has poor mechanical strength, so it is used on one side of the semipermeable membrane support (hereinafter referred to as "semipermeable membrane coating surface") composed of a fibrous substrate such as non-woven fabric or woven fabric. A semi-permeable membrane is used.

[0003] The method of providing a semipermeable membr...

Examples

Embodiment 1

[0144] Large diameter fiber (stretched polyester fiber, fiber diameter 14.3μm, fiber length 5mm, elongation rate 45%, tensile strength 0.40N / tex), binder synthetic fiber (undrawn polyester fiber, Fiber diameter 10.5μm, fiber length 5mm, melting point 230℃), fine-diameter fiber (stretched polyester fiber, fiber diameter 6.4μm, fiber length 5mm, elongation 45%, tensile strength 0.40N / tex), The mixing ratio of 35:30:35 is mixed and dispersed in water. After the wet paper is formed by a cylinder paper machine, it is dried by hot pressing with a Yankee dryer with a surface temperature of 130°C to obtain a weight per unit area of ​​80g / m 2 Sheet.

[0145] Using a calendering device combining a heated metal roll and a heated metal roll, the obtained sheet was subjected to hot pressing under the conditions of a temperature of 200° C., a pressure of 785 N / cm, and a processing speed of 6 m / min to obtain a semipermeable membrane support. It should be noted that the surface in contact with t...

Embodiment 2

[0147] A semipermeable membrane support was obtained in the same manner as in Example 1, except that the processing speed during the hot press processing was set to 30 m / min.

Embodiment 3

[0149] The semipermeable membrane support was obtained in the same manner as in Example 1, except that the processing speed during the hot pressing was set to 60 m / min.