JP2904897B2 - Method for manufacturing hollow fiber membrane module - Google Patents

Description

The present invention relates to a method for manufacturing a hollow fiber membrane module.

(B) Conventional technology Conventionally, various types of semipermeable membrane modules, which are the heart of a reverse osmosis apparatus, an ultrafiltration apparatus, or a microfiltration apparatus, are used depending on the application.

One of them, the hollow fiber membrane module, has a length of 10
It contains a hollow fiber bundle consisting of a large number of tens to tens of thousands of hollow fibers having a diameter of about 0 to 2000 mm and an outer diameter of about 0.02 to 3 mm. The ends of the hollow fiber bundle are mainly bonded and sealed with an epoxy adhesive or a urethane adhesive.

Such a hollow fiber type membrane module is widely used in various fields because of its compactness. In particular, in a field where heat resistance is required, an epoxy-based adhesive is often used as an adhesive for the above-mentioned adhesive sealing.

Usually, this type of membrane module has a single adhesive seal. This is because it was easy to fill and cure the adhesive at once in the production of the hollow fiber membrane module.

(C) Problems to be Solved by the Invention In bonding and sealing such a module, the membrane module case and the hollow fiber bundle are simultaneously sealed. Usually, the hollow fibers contain some humectant, for example, glycerin.

If such a humectant adheres to the inside of the case before bonding and sealing, it will contaminate the inner surface of the case and cause a decrease in the adhesive strength between the case and the adhesive. Further, even if the inner surface of the case is subjected to a surface treatment in order to obtain a larger adhesive strength, the moisturizer adheres to the surface, and the expected adhesive strength is often not obtained.

In recent years, the hollow fiber membrane module has been required to have high reliability, and high heat resistance and durability have been demanded. As a result, the above-mentioned problems, which have not been a problem in the past, have become problems, and there has been a danger that the adhesive will peel off from the case when a large heat shock is applied.

The present invention has been made in view of the above circumstances,
An object of the present invention is to provide a method of manufacturing a hollow fiber membrane module that can prevent the adhesive from peeling from a case and can obtain a high adhesive force particularly when a surface treatment is performed on an inner surface of the case. I do.

(D) Means and Action for Solving the Problems According to the present invention, a hollow fiber bundle formed by bundling a large number of hollow fibers of substantially the same length is loaded into a membrane module case, At least one of the ends is bonded and sealed, and the end between the bonded and sealed hollow fiber bundle and the corresponding end of the case is bonded and sealed. The cross-section of the inner adhesive layer is formed by bonding and sealing only the ends of a large number of hollow fibers, and the entire circumference of the inner adhesive layer is surrounded by the inner adhesive layer and the case except for the hollow fiber bundle. A method of manufacturing a hollow fiber type membrane module comprising an outer adhesive layer formed by bonding and sealing the inner surface of a hollow fiber bundle, wherein the space between the end of the hollow fiber bundle and the corresponding end of the case is bonded and sealed. Before stopping, cover the inner surface of the corresponding end of the case with an adhesive and cure it in advance. This is a method for producing a hollow fiber membrane module.

Here, the hollow fiber bundle usually contains a humectant such as glycerin, water or a surfactant to maintain the performance. These are contained in the porous portion in the membrane of the hollow fiber, but partly bleed on the outer surface. When such a hollow fiber bundle is adhesively sealed, the humectant oozing on the outer surface of the hollow fiber adheres to the inner surface of the case to be sealed, but this ensures that the adhesive force between the case and the adhesive is sufficient. Can not be demonstrated.

In the membrane module of the present invention, since the case and the hollow fiber bundle are formed of separate adhesive layers, the humectant of the hollow fiber does not directly adhere to the case, and a sufficient adhesive force can be obtained.

As shown in FIG. 2, for example, as shown in FIG. 2, the membrane module according to the present invention has a case and an adhesive layer (the inner side) including the hollow fiber bundle. (Adhesive layer). Also, as shown in FIG. 1, for example, as shown in FIG. 1, an adhesive is applied to the inner surface of the end of the case to form an adhesive layer. The space may be adhesively sealed.

According to the present invention, it is not necessary to hold the hollow fiber bundle in the case when bonding by a method of strengthening the case by the adhesive force between the case and the adhesive (for example, chemical surface treatment of the case). This is very advantageous because it is simple and does not need to consider the effect of the humectant of the hollow fiber.

The adhesive used for bonding only the case and the adhesive used for bonding only the hollow fiber bundle may be the same or different. For example, to bond only the case, an adhesive having strong adhesion to the material of the case and bonding conditions can be selected. Also, for bonding only hollow fiber bundles,
Adhesives and bonding conditions that can easily bond the hollow fiber bundle can be selected.

In the case of the membrane module of the present invention, an adhesive interface exists between the adhesive layer to which the case is bonded and the adhesive layer to which the hollow fiber bundle is bonded. In the case of having a similar structure, particularly strong adhesion can be obtained, and there is no problem at all. The adhesive used in the present invention may be any. For example, in addition to an epoxy-based adhesive, a urethane-based adhesive, or the like, a thermoplastic resin may be melted and bonded.

In the method for producing a hollow fiber membrane module according to the present invention, the inner surface of the case is previously coated (coated) with an adhesive.
After curing, the hollow fiber bundle is inserted into the case, and the ends of the hollow fibers and the end of the case coated with the adhesive are bonded and sealed with an adhesive. Such a manufacturing method is particularly simple and effective.

(E) Embodiment Hereinafter, the present invention will be described in detail based on two embodiments shown in the drawings. The present invention is not limited by these.

Example 1 In FIGS. 1 and 2, the inner diameter was 84 mm, the outer diameter was 90 mm,
After the inner surface of the polysulfone cylindrical case 4 having a length of 300 mm was degreased with ethanol, an epoxy-based adhesive was applied to the inner surfaces of both ends of the case 4 at 90 ° C. and cured.
1 is the adhesive layer (outer adhesive layer).

Then, 2,000 hollow fibers 3 made of polyethersulfone having an inner diameter of 800 μm and an outer diameter of 1300 μm were inserted into the case 4.
Then, an epoxy-based adhesive, inner surface at both ends of the case 4 is covered with an epoxy-based adhesive layer 1 and between the hollow fiber 3 ends mutually centrifuged sealed and a hollow fiber membrane module M _1. Here, reference numeral 2 denotes an inner adhesive layer formed by bonding and sealing only the ends of a large number of hollow fibers 3.

Comparative Example 1 The inner surface of Case 4 exactly the same as that used in Example 1 was degreased with ethanol in the same manner as in Example 1. afterwards,
2,000 hollow fibers 3 made of polyethersulfone having an inner diameter of 800 μm and an outer diameter of 1300 μm were inserted into the case and centrifugally sealed in exactly the same manner as in Example 1 to obtain a hollow fiber membrane module.

Reliability Test 1 12 hollow fiber membrane modules of Example 1 and Comparative Example 1 were used.
After aeration at 0 ° C for 10 minutes, water at 20 ° C at 240 l / h
This operation was repeated with one operation of passing water for one minute.

When the 50th and 100th operations were completed, the presence or absence of peeling between the inner surface of the hollow fiber membrane module case 4 and the outer adhesive layer 1 was examined. According to the result, the hollow fiber membrane module M ₁ of Example 1 did not cause peeling even 100th. However, the hollow fiber membrane module of Comparative Example 1 was peeled off at the 50th time.

Example 2 In FIG. 3, both ends of a case 14 bonded to a hollow fiber bundle among the inner surfaces of a polypropylene cylindrical case 14 having an inner diameter of 79 mm, an outer diameter of 89 mm and a length of 300 mm were subjected to a sulfuric acid-bichromate solution. After soaking for 10 hours, it was washed with water and dried.

Then, immediately apply an epoxy adhesive to the same part,
Cured. 1 is the adhesive layer (outer adhesive layer).

Then, 1750 polyethersulfone hollow fibers 3 having an inner diameter of 800 μm and an outer diameter of 1300 μm were inserted into the case 14.
And a case in which the inner surface is covered with an epoxy adhesive layer 1
Centrifugal sealing between both ends of 14 and between three ends of the hollow fiber,
And a hollow fiber membrane module M _2. Here, reference numeral 2 denotes an inner adhesive layer formed by bonding and sealing only the ends of a large number of hollow fibers 3, and reference numeral 5 denotes a part of the case 14 or a ring.

Comparative Example 2 A hollow fiber membrane module was prepared in the same manner as in Example 2, except that the surface treatment of the case 14 was performed and the subsequent application of the epoxy adhesive was not performed.

Reliability Test 2 The hollow fiber membrane modules of Example 2 and Comparative Example 2
Water at 240 l / h for 10 minutes.
This operation was repeated with one operation of passing water at 0 l / h for 10 minutes.

Examination of the presence or absence of peeling between the case 14 and the outer adhesive 1 of the hollow fiber membrane module at the time of completion of the 20 th and 50 th operation, the hollow fiber membrane module M ₂ of Example 2 50
No peeling occurred at the second time. However, the hollow fiber membrane module of Comparative Example 2 had peeled off at the 20th time.

(F) Effect of the Invention According to the method for manufacturing a hollow fiber membrane module of the present invention, the adhesive sealing between the hollow fiber ends and the adhesive sealing of the hollow fiber bundle to the case are separately performed. The problem that the adhesive is peeled off from the substrate is solved.

In general, in the production of a hollow fiber membrane module, even if the surface of the case is treated so that the surface of the case can be easily adhered, the bundle of hollow fibers can be inserted and stored in the case state until modularized. Many. This tendency is particularly remarkable in plasma processing and the like. However, according to the method for manufacturing a hollow fiber membrane module of the present invention, if the surface of the case is treated and the inner surface of the case is applied and cured with an adhesive while the surface activity is high, the effect of the surface treatment is obtained. Can be obtained. It is also possible to save in this state.

[Brief description of the drawings]

1 to 3 show two embodiments of the present invention. That is, FIG. 1 is an explanatory view of a main part of the first embodiment, FIG. 2 is a horizontal sectional view of the main part, and FIG. 3 is an explanatory view of a main part of the second embodiment. 1 ... Outer adhesive layer, 2 ... Inner adhesive layer, 3 ... Hollow fiber, 4.14 ... Case.

Claims (1)

(57) [Claims] A hollow fiber bundle obtained by bundling a large number of hollow fibers into substantially the same length is loaded into a membrane module case, and at least one end of both ends of these hollow fibers is adhesively sealed. Further, the gap between the end of the bonded and sealed hollow fiber bundle and the corresponding end of the case is bonded and sealed, and the cross section of the bonded and sealed portion is the end of a large number of hollow fibers. An inner adhesive layer formed by bonding and sealing only the parts, and an outer periphery surrounding the entire periphery of the inner adhesive layer and bonding and sealing the inner adhesive layer and the inner surface of the case except for a hollow fiber bundle. A method of manufacturing a hollow fiber type membrane module comprising an adhesive layer, the method comprising: before bonding and sealing between an end of a hollow fiber bundle and a corresponding end of a case; Hollow fiber membrane module characterized in that the inner surface of the fiber is coated with an adhesive and cured Manufacturing method.