JPH06277460A - Manufacturing method of hollow fiber membrane module - Google Patents

Abstract

(57) [Summary] [Structure] In a method for manufacturing a hollow fiber membrane module in which a hollow fiber membrane is filled in a case and the gaps between both ends of the hollow fiber membrane and the case are sealed with a resin, A case is used in which two or more grooves having an undercut are provided in the bonded portion in the direction perpendicular to the direction of the hollow fiber. [Effect] By providing an undercut groove in the resin sealing portion of the case used in the method for manufacturing the hollow fiber membrane module, the case and the epoxy sealing resin are firmly adhered, and the hollow fiber membrane module permeates by peeling. There is no leak on the supply side and the supply side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a hollow fiber membrane module used for separating and supplying various substances.

[0002]

2. Description of the Related Art A hollow fiber membrane module is a case, a bundle of hollow fibers packed into the case and arranged in a bundle of hundreds to tens of thousands, and a hollow fiber bundle in a housing which is fixed and permeates through a supply side. It is composed of a sealing resin part at the end to separate the sides.It is industrially provided by the function of supplying a substance to the inside or outside of the hollow fiber and separating various substances through the hollow fiber membrane wall. Is used for.

A general method for manufacturing a hollow fiber membrane module is as follows: (1) a step of forming a hollow fiber bundle, (2) a step of inserting the fiber bundle into a case and sealing the end, and (3) an end of the hollow fiber. And a cutting step for opening the portion.

The hollow fiber bundle is generally formed by winding and cutting up to a predetermined number by a skein machine. Further, as a method of sealing the end portions of the hollow fibers, a method in which a sealing resin is poured into the yarn bundle and both ends of the module by a centrifugal force and cured is generally used. Generally, the end portions are cut for each sealing resin to open the hollow fibers.

As the module case, thermoplastic resins such as polysulfone and hard vinyl chloride are generally used. Epoxy adhesives are mainly used as the sealing resin.

When the hollow fiber membranes having various separation performances are modularized and industrially used, the sealing portion is extremely important and has sufficient strength so as not to be deformed by stress and heat during the separation operation. In addition, it is required that the hollow fiber and the case are firmly bonded so that there is no leakage on the permeate side and the supply side.

As a method for improving the adhesion between the case and the sealing resin, for example, Japanese Patent Publication No. 12168/1992 discloses that
A method has been proposed in which the end of the hollow fiber bundle is forcibly peeled off from the case, and the epoxy adhesive is injected again into the gap between the peeled adhesive and the case to seal the hollowed bundle.

In addition, a case in which a groove is provided in the case and a catch is provided so that the case and the sealing resin are not separated from each other due to the stress during the separating operation has been conventionally devised.

[0009]

However, the epoxy resin used as the encapsulating resin undergoes volume contraction during curing, and the resulting stress concentrates on the adhesive interface between the case and the encapsulating resin, causing mechanical stress. There is a problem that the case and the epoxy resin are easily separated from each other due to shock or heat shock. This peeling caused a leak between the permeate side and the supply side of the hollow fiber membrane module, which was a fatal defect for the hollow fiber membrane module.

Further, after curing the epoxy adhesive at a glass transition temperature or more in order to improve heat resistance and durability, the epoxy resin is extremely effective at the time of curing. The material thermally expands, so that peeling of the adhesive surface frequently occurs, and thus far it has not been possible to impart sufficient heat resistance and durability to the hollow fiber membrane module.

As a means for solving these problems, there is a method disclosed in the above Japanese Patent Publication No. 4-12163, but not only the production efficiency is extremely poor because the adhesive sealing must be performed twice, but The interface with the incompletely bonded case must be forcibly peeled off by mechanical or thermal shock, which may damage the hollow fiber membrane, resulting in impaired durability of the membrane module. Occurred and was not very preferable. Further, it is difficult to provide a sufficient adhesive strength between the epoxy sealing resin and the case by simply providing a groove in the case, and the durability is poor.

[0012]

DISCLOSURE OF THE INVENTION The present inventors have arrived at the present invention as a result of extensive studies to solve such problems. That is, the present invention is a method of manufacturing a hollow fiber membrane module in which a hollow fiber membrane is filled in a case, and then the gaps between both ends of the hollow fiber membrane and the case are sealed with a resin. The present invention relates to a method for producing a hollow fiber membrane module, which uses a case provided with a groove having a cut.

The gist of the present invention is to form a groove in the undercut on the adhesive surface with the epoxy encapsulating resin so that even if the epoxy resin of the adhesive cures and shrinks, the adhesiveness with the case is maintained and the interface is completely removed. This is a method for producing a hollow fiber membrane module that eliminates the problem of leakage between the permeate side and the supply side due to peeling.

According to the present invention, it is possible to easily manufacture a membrane module having excellent adhesiveness between a case and an epoxy sealing resin by a conventional general sealing method. The hollow fiber membrane used in the present invention is manufactured by filling the hollow fiber membrane in a case, sealing the gap between both ends of the hollow fiber membrane and the case with a resin, and cutting the end face. The obtained module has a structure in which the inner surface of the hollow fiber membrane is open at the sealing portion.

The case of the present invention is characterized by having an undercut groove in the case contact portion of the resin sealing portion.
Here, the groove having an undercut referred to in the present invention refers to a groove having a maximum width that is larger than the width of the opening on the surface.

The groove of the case may be undercut and may be tapered or hook-shaped, and its shape is not particularly limited. For example, in FIG.
Examples of the shapes include (B) and (C).

It is preferable that the undercut is tight, that is, the ratio of the maximum width of the groove to the width of the groove formed on the surface is large. Also, the depth and width of the undercut groove are not particularly limited as long as bubbles and the like are not mixed in the groove at the time of sealing and the epoxy resin can evenly spread into the groove.

The direction of the groove having the undercut is preferably a direction perpendicular to the direction in which the greatest stress is generated when the hollow fiber membrane module is used. For example, when inserting a hollow fiber bundle into a cylindrical case, sealing both ends of the case, and performing a separation operation by supplying a substance from one side of the opened hollow fiber, the undercut groove has a direction perpendicular to the hollow fiber membrane, That is, it is preferable to insert them in the circumferential direction of the cylindrical case.

There is no limit to the number of undercut grooves,
In order to achieve the object of the present invention, it is preferable to insert two or more. This is because the larger the area of the undercut portion, the greater the effect.

In the present invention, the sealing method is not particularly limited, and for example, centrifugal sealing or potting method can be applied.
As a sealing resin for the membrane module of the present invention, an epoxy resin or the like can be mainly used.

As a material for the case, a thermoplastic resin such as polysulfone, hard vinyl chloride, polycarbonate or polyphenylene sulfide can be used.

[0022]

EXAMPLES The effects of the present invention will be described below with reference to examples and comparative examples. Example 1 Polymethylpentene hollow fiber in a housing of transparent hard vinyl chloride having an inner diameter of 160 mm, an outer diameter of 180 mm and a length of 500 mm, in which four undercut grooves shown in the model diagram of FIG. 2 are inserted in the epoxy resin adhesive portion of the case. Insert a yarn bundle of about 20,000 membranes, seal the hollow fiber ends with urethane resin, attach this to a centrifugal sealing machine, and use Epicron EX-835LV manufactured by Dainippon Ink and Chemicals as the epoxy resin for sealing. Use 1,3-bisaminomethylcyclohexane as a curing agent, initial temperature 60 ℃, rotation speed 600 rp
Centrifugal sealing is performed for about 2 hours at m, and the thickness of the sealing resin is about 3
A 0 mm hollow fiber membrane module was manufactured. At this time, the peeling of the sealing resin at the case interface was not visually observed. Further, after-curing was performed in an air atmosphere at 100 ° C. for about 2 hours. Although peeling was observed at the interface of the case other than the undercut part and a small part of the epoxy resin, the undercut part of the case was completely bonded. Next, the sealed hollow fiber end of this module was cut together with the sealing resin to open the hollow fiber end. A cap was attached to this module, and hot water of 85 ° C was used to repeatedly apply a pressure of 0 to 10 kgf / cm ² · G at 100,000 times at intervals of 5 seconds. The hollow fiber was formed by peeling the case and the epoxy resin. No water leakage occurred on the permeate side and the supply side of the membrane module.

Example 2 A module was prepared in the same manner as in Example 1 except that the groove of the case had the shape shown in FIG. The same durability test as in Example 1 was performed, but no water leakage occurred on the permeate side and the supply side of the hollow fiber membrane module.

Example 3 A module was prepared in the same manner as in Example 1 except that the groove of the case had the shape shown in FIG. The same durability test as in Example 1 was performed, but no water leakage occurred on the permeate side and the supply side of the hollow fiber membrane module.

Comparative Example 1 A module was manufactured in the same manner as in Example 1 except that the groove of the case was a square groove as shown in FIG. When after-curing was performed for about 2 hours in an air atmosphere at 100 ° C., some peeling of the interface between the case and the epoxy sealing resin was recognized even in the square groove portion. Further, when the same durability test as in Example 1 was conducted, water leakage occurred from the case and the epoxy sealing portion, and the amount of water leakage increased with time.

[0026]

By the manufacturing method of the present invention, there is no leak on the permeate side and the supply side of the hollow fiber membrane module due to the peeling between the case and the epoxy sealing resin, which has been a big problem in the conventional hollow fiber membrane module.

[Brief description of drawings]

FIG. 1 is a model diagram of a hollow fiber membrane module manufactured in an example.

[Fig. 2] Undercut groove with one side surface tapered

[Fig. 3] Undercut groove with a hook on one side

FIG. 4 Undercut groove with tapered side surfaces

[Figure 5] Square groove

[Explanation of symbols]: Cap: Epoxy resin sealing part: Hollow fiber membrane: Case: Case and sealing resin adhesive part

Claims (3)

[Claims] 1. A method for producing a hollow fiber membrane module, comprising filling a hollow fiber membrane into a case and then sealing the gaps between both ends of the hollow fiber membrane and the case with a resin. A method for manufacturing a hollow fiber membrane module, characterized in that a case provided with a groove having a cut is used. 2. The method according to claim 1, wherein the case is provided with a groove perpendicular to the direction of the hollow fiber membrane. 3. The method according to claim 1, wherein the case is a case in which two or more grooves are provided for one adhesive portion.