JPS60206412A - Method for repairing end surface of hollow yarn membrane separation module - Google Patents

Abstract

PURPOSE:To perfectly and simply repair the adhesion inferior place of the end surface of a module, by using a photocurable material, wherein a photopolymerizable resin composition layer is provided to a transparent support, as a repairing member and transferring the photocurable resin thereof to the injection resin end surface. CONSTITUTION:A photocurable material 1, wherein a photopolymerizable resin composition layer 11 is provided on a transparent support 12 comprising a polyethylene sheet, is closely adhered to the end surface 2 of a module under heating and, thereafter, exposed to ultraviolet rays or visible light. The photopolymerizable resin composition layer 11 on the injection resin parts 21 of the end surface 2 is cured by photopolymerication to be strongly adhered to the injection resin parts 21. Because there is no adhered substance in the opening parts 22 of the end surface and oxygen in air present in the opening parts 22 functions as a photopolymerization inhibitor, when the transparent support 12 is peeled off after exposure, the photocured resin on the opening parts 22 is peeled off in a state held to the transparent support 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for repairing the end face of a hollow fiber membrane separation module, and more particularly to a method for completely and easily repairing leak points on the end face of the module.

Hollow fiber membrane separation modules are widely used for processing various industrial liquids and gases, for medical purposes, and as equipment for producing ultrapure water.

In such a hollow fiber membrane separation module, for example, the hollow fiber membranes and the cylindrical case housing them are adhesively fixed at both ends with casting resin, and the hollow fiber membranes are bonded to each other on both end faces of the casting resin. It is known to have an opening.

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When separating liquids using the above module, the stock solution is usually supplied from one open end surface of the hollow fiber membrane, the concentrated liquid flows out from the other open end surface, and the obtained permeate is placed in a cylindrical case. The permeate is discharged from the permeate outlet. In this case, the stock solution and concentrated solution must not leak to the permeate side, and if leakage occurs, the performance of the module will deteriorate and it will become unusable. The cause of this leak is often due to poor adhesion between the casting resin, hollow fiber membrane, and cylindrical case at the end, and therefore, it is necessary to repair this poor adhesion.

Conventionally, as the above-mentioned repair methods, a repair method using a depressurization method (Japanese Patent Application Laid-open No. 54435675) and a repair method using a pressurization method (Japanese Patent Application Laid-open No. 138874-1987) have been proposed, but these methods Since the opening of the hollow fiber membrane is blocked during the process, the end must be further cut to open the hollow fiber membrane, which is very complicated and disadvantageous in terms of cost. Ta.

The present invention has been made to solve the drawbacks of the prior art, and provides a method for repairing the end face of a module without blocking the openings of the hollow fiber membranes.

That is, the present invention provides a method for repairing the end face of a module in which the hollow fiber membranes are adhesively fixed to each other with casting resin at the ends of a plurality of parallel hollow fiber membranes. , A photocurable material consisting of a photopolymerizable resin composition layer provided on a transparent support as a repair member is brought into close contact with the photopolymerizable resin composition layer on the end face side, and then the photocurable material is applied from the transparent support side. The present invention relates to a method for repairing an end face of a hollow fiber membrane separation module, which comprises transferring the photocurable resin onto the cast resin portion of the end face by peeling off the transparent support after exposure.

The repair member used in the present invention is a photocurable material in which a photopolymerizable resin composition layer is transferably provided on a transparent support, and the transparent support has good light transmittance and mold releasability. It is not particularly limited as long as it is a certain plastic sheet, and examples thereof include sheets of polyethylene, polypropylene, and the like. The photopolymerizable resin composition is not particularly limited as long as it can be polymerized and cured by light to form a film, and it usually contains an ethylenically unsaturated polymerizable compound, a film-forming polymeric substance, and a photopolymerization initiator. is used.

The thickness of the photopolymerizable resin composition layer varies depending on the inner diameter of the hollow fiber membrane, but the inner diameter is 20 to 20 mm.

μm1 usually 500-1, 500μm1 film thickness 5-1
, 000 μm 1 When the present invention is applied to a hollow fiber membrane having a diameter of usually 100 to 500 μm, a membrane having a diameter of usually 1 to 100 μm, preferably about 1 to 20 μm is used.

As such a photocurable material, for example, Japanese Patent Application Laid-Open No. 57-5
Those described in No. 8140 and JP-A-57-58141 can be used, and specific examples thereof include Neodolock (trade name) manufactured by Nitto Electric Industry Co., Ltd.

In the present invention, as shown in the drawings, after the photocurable material 1 is brought into close contact with the module end face 2, preferably by heating, the end face 2 is exposed to ultraviolet rays or visible light having a wavelength of about 350 to 500 nm. Casting resin part 2
The photopolymerizable resin composition layer 11 on 1 is photopolymerized and cured to strongly adhere to the cast resin part 2.1. - There is no adherend in the opening 22 of the end face 2, and the photopolymerizable resin composition layer 11 on the opening 22 is coated with oxygen in the air present in the opening 22 acting as a photopolymerization inhibitor. It is thought that the degree of photopolymerization is low and there is a difference in the degree of polymerization of the photopolymerizable resin composition layer 11 on the casting resin part 21 and on the opening 22, so the transparent support 12 is peeled off after exposure. By doing so, the photocurable resin on the opening 22 is peeled off while being held on the transparent support 12 and the photocurable resin is transferred only onto the casting resin part 21 without blocking the opening 22. I can do it.

Further, in the present invention, the adhesive curing of the photopolymerizable resin composition can be made more complete by further exposing the transparent support to light after peeling it off.

As described above, according to the present invention, since a unique type of photocurable material in which a photopolymerizable resin composition layer is transferably provided on a transparent support is used as a repair member, the hollow fiber membrane openings There is an advantage that the photocurable resin can be transferred to the end face of the casting resin without clogging the module, and that poor adhesion on the end face of the module can be completely and easily repaired.

Hereinafter, the present invention will be specifically explained with reference to Examples.

Example 3,700 polysulfone hollow fiber membranes each having an inner diameter of 500 μm and a film thickness of 250 μm were housed in a vinyl chloride cylindrical case with an inner diameter of 77 mm and a length of 1,077 mm, and both ends were adhesively fixed with an epoxy resin composition. After the resin cured, the hollow fibers were sealed. A hollow fiber membrane separation module was obtained by cutting both ends of the membrane so that it was open.

When a leak test was conducted by supplying pressurized gas to the outside of the hollow fiber membrane of this module, it was found that the pressure of the pressurized gas decreased and a leak point occurred.

Therefore, as a repair material, a polyester film with a thickness of 2
A photocurable material having a 0 μm photopolymerizable resin composition layer (manufactured by Nitto Electric Kogyo Co., Ltd., trade name: Neodorock-E) is heat-adhered to the end face of the module using a laminator at a temperature of 60°C. High pressure mercury lamp (output 3KW, wavelength 350
~500 nm) from a distance of about 60 cm for 10 seconds, the transparent support was peeled off and the photocured resin was transferred to the end face of the casting resin.

A leak test was performed again on the module whose end face had been repaired as described above, but no leakage points were found.1 Also, the openings of the hollow fiber membranes were not blocked in any way.

[Brief explanation of the drawing]

The drawing is a sectional view of a main part of the module end for explaining the present invention in detail.

Claims (1)

[Claims] In a method for repairing the end face of a module in which the hollow fiber membranes are adhesively fixed to each other with casting resin at the ends of a plurality of parallel hollow fiber membranes, a transparent repair member is attached to the end face on the opening side of the hollow fiber membranes. A photocurable material comprising a photopolymerizable resin composition layer provided on a support is brought into close contact with the photopolymerizable resin composition layer on the end face side, and exposed from the transparent support side, and then transparent A method for repairing an end face of a hollow fiber membrane separation module, comprising transferring a photocurable resin onto a cast resin portion of the end face by peeling off a support.