JPH1133366A - Two-layer centrifugal bonding device of hollow fiber membrane module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten bonding time by providing a pneumatically operated valve capable of opening and closing a passage in a midway of a connection pipe between a hollow fiber membrane module case having hollow fiber membranes included therein and rotatably fixed on a rotative body and a container having a flexible resin contained therein. SOLUTION: A particular number of hollow fiber membranes are bundled and their end parts are stopped and are filled in a hollow fiber membrane module case 4 and a bonding jig 7 is fixed to an end part of the case 4 by means of a jig 6. The bonding jig 7 is connected to an adhesive container 11 with an injection tube 8 and a nozzle 5 of the hollow fiber membrane module case 4 is connected to a flexible resin container 12 via a pneumatically operated valve 10 with an injection tube 9. The adhesive container 11 and a flexible resin container 12 are filled with an adhesive and a flexible resin, respectively, and the pneumatically operated valve 10 is closed and centrifugal bonding is started. The adhesive is injected from the adhesive container 11 and a rotatable rack 1 is rotated for a specified period of time before the pneumatically operated valve 10 is fully opened and the resin is injected from the flexible resin container 12 and rotation of the rack 1 is stopped after an elapse of a specified period of time. Bonding is carried out without stopping rotation of a rotative body of a centrifugal bonding device so that bonding time is largely shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal bonding apparatus for a hollow fiber membrane module which applies a centrifugal force to a hollow fiber membrane module to seal the end of the hollow fiber membrane with an adhesive. The present invention relates to a two-layer centrifugal bonding apparatus for a hollow fiber membrane module for producing a hollow fiber membrane module by two-layer centrifugal bonding in which the hollow fiber membrane is reinforced with a flexible resin.

[0002]

2. Description of the Related Art Hollow fiber membrane modules are generally used for reverse osmosis membranes, ultrafiltration membranes, microfiltration membranes, etc. because they can provide a large membrane area per unit volume. As a method of assembling the hollow fiber membrane module, first, the hollow fiber membrane bundle is inserted into the case, then the ends of the hollow fiber membrane bundle are stopped, and then the case is rotated to apply centrifugal force to both ends. The adhesive is poured between the hollow fiber membrane bundles and between the hollow fiber membrane bundle and the case in a state where the hollow fiber membrane bundle is actuated, and the ends of the hollow fiber membrane bundle and the case are bonded and fixed, and then the end of the hollow fiber membrane bundle is Cutting part,
Opened, a hollow fiber membrane module is manufactured.

An epoxy resin or a urethane resin is generally used as an adhesive for bonding and fixing the hollow fiber membrane bundle and the end of the case. However, since these adhesives have high viscosity, the above-mentioned hollow fiber membrane is used. During the module manufacturing stage, the adhesive first penetrates through a relatively large gap between the case and the hollow fiber membrane bundle, and then penetrates through a relatively small gap between the hollow fiber membrane bundle.

[0004] For this reason, the adhesive interface between the hollow fiber membrane and the adhesive may be cured in a state where the adhesive is coated only thinly. Since such a portion is close to the nozzle that serves as the inlet and outlet for the stock solution and filtrate of the hollow fiber membrane module,
If the use conditions are severe, the hollow fiber membrane may be broken at the adhesive interface.

[0005] In particular, in the condensate treatment and dewatering treatment of water in a nuclear power plant, an air scrubbing method is used in which the solid matter attached to the hollow fiber membrane is shaken off by vibrating the hollow fiber membrane with air. Therefore, reinforcement of the hollow fiber membrane at the bonding interface is important.

For this reason, as disclosed in Japanese Utility Model Application Laid-Open No. 61-132002, Japanese Patent Application Laid-Open No. 61-157308, and Japanese Patent Application Laid-Open No. 62-144708, the adhesive interface is made of a flexible resin. A technique of two-layer centrifugal bonding for reinforcement has been proposed. These, 2
As a conventional example of the layer centrifugal bonding technique, the centrifugal bonding apparatus is stopped after the adhesive is hardened, and then a flexible resin is set and injected again by centrifugal bonding.

[0007]

However, in the production of the hollow fiber membrane module, when the curing speed of the adhesive is increased, the heat generated by the curing of the adhesive is increased, which causes cracks in the bonded portion and peeling from the case. Therefore, it is necessary to reduce the curing speed of the adhesive as much as possible, which requires a long curing time.

Further, since the flexible resin is used only for reinforcing the bonding interface, the amount of the resin is small. Even if the temperature of the resin is increased, the heat is taken away by the surroundings, so that the curing time is long and the two-layer centrifugal bonding is required. In the case where is adopted, there has been a problem that the total bonding time is twice or more as long as the case where the reinforcing with the flexible resin is not performed.

The present invention has been made to solve the above problems, and
The purpose is to shorten the bonding time by performing the bonding process without stopping the rotation of the rotating body of the centrifugal bonding device when performing two-layer centrifugal bonding with the adhesive and the flexible resin. Another object of the present invention is to provide a two-layer centrifugal bonding apparatus for a hollow fiber membrane module which can enhance the protective effect of the bonding interface by allowing a flexible resin to enter deep into the hollow fiber membrane bundle.

[0010]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems. As a result, after the injection of the adhesive is completed by centrifugal bonding, the rotation of the rotating body of the centrifugal bonding apparatus is not stopped. Then, compressed air is introduced from the outside of the rotating body through an air pipe provided on a rotating shaft of the rotating body, and a valve means for opening and closing the flow path of the flexible resin is actuated by the compressed air. , The curing of the adhesive and the curing of the flexible resin can be performed almost at the same time, and the flexible resin permeates deeply between the hollow fiber membrane bundles, and it is found that the effect of protecting the bonding interface is large. The present invention has been completed.

That is, a typical configuration according to the present invention for achieving the above object is to fix a large number of hollow fiber membrane ends with an adhesive and to make the inside of the bonded portion of the hollow fiber membrane ends flexible. In a two-layer centrifugal bonding apparatus of a hollow fiber membrane module for manufacturing a hollow fiber membrane module in which a hollow fiber membrane at the bonding interface is reinforced by covering with a conductive resin layer, the hollow fiber membrane is accommodated and fixed to a rotating body to be rotatable. Supplying compressed air from outside of the rotating body through an air pipe provided on a rotating shaft of the rotating body between a piping connecting a hollow fiber membrane module case and a flexible resin container containing a flexible resin; A two-layer centrifugal bonding apparatus for a hollow fiber membrane module, further comprising an air-driven valve capable of opening and closing a flow path of a pipe connecting the hollow fiber membrane module case and the flexible resin container.

The adhesive used in the above construction is
Among epoxy resins, urethane resins, etc., those having high pressure resistance as generally used for fixing hollow fiber membranes, and the flexible resin is a material softer than the adhesive. It is necessary, for example, urethane resin,
Any material having flexibility, such as silicone resin, may be used. Preferably, the resin has a lower elastic modulus than the hollow fiber membrane used.

Further, as a combination of the adhesive and the flexible resin, when the adhesive has a smaller specific gravity, the adhesive layer is provided on the inner side where centrifugal force acts, that is, on the adhesive interface side of the hollow fiber membrane module. Since the adhesive is formed and does not protect the hollow fiber membrane, it is necessary to select the adhesive so that the specific gravity is higher. Further, the adhesive is selected to have a strong adhesive strength with the hollow fiber membrane, but the flexible resin may or may not have the adhesive strength with the hollow fiber membrane.

In the above structure, the material of the hollow fiber membrane may be a polysulfone-based resin, a polyacrylonitrile-based resin, a fluorine-based resin, a polyolefin resin, a cellulose-based resin, or the like. This is particularly effective when a hollow fiber membrane having a small tensile strength and elongation, such as an acrylonitrile resin or a cellulose resin, is used.

As the valve means, an air drive valve such as a ball valve and a butterfly valve is provided between the pipes connecting the hollow fiber membrane module case and the flexible resin container, and the air drive valve is closed. Then, the rotation of the rotating body is started, and after a predetermined time, the air-driven valve is opened to inject the flexible resin.

It is preferable that the air-driven valve be configured so as to open or close the flow path of the flexible resin by supplying compressed air from an air pipe provided on a rotating shaft of a rotating body of the centrifugal bonding apparatus.

More preferably, an air-driven cylinder valve may be used instead of the air-driven valve to externally press or release the elastic tube serving as a pipe for introducing the flexible resin. If the flow path of the flexible resin is configured to be blocked or communicated, the flexible resin cured in the tube may be replaced for each tube, and the workability is improved.

In the two-layer centrifugal bonding apparatus for a hollow fiber membrane module of the present invention, it is preferable that the temperature inside the centrifugal bonding apparatus can be controlled in order to keep the curing time of the adhesive and the flexible resin constant.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a two-layer centrifugal bonding apparatus for a hollow fiber membrane module according to the present invention will be specifically described with reference to the drawings. FIG. 1 is a schematic diagram showing the configuration of a two-layer centrifugal bonding apparatus for a hollow fiber membrane module according to the present invention. FIG. 2 is a diagram in which the ends of a hollow fiber membrane bundle are bonded in two layers with an adhesive and a flexible resin. FIG. 3 is a partially enlarged view showing the situation, and FIG. 3 is a view showing the configuration of an air-driven cylinder valve.

As shown in FIG. 1, a two-layer centrifugal bonding apparatus A for a hollow fiber membrane module according to the present invention includes a rotating rack 1 serving as a rotating body which rotates about a rotating shaft 2 and a rotating shaft 2. It has rotating means 3 such as a motor for rotating the rotating rack 1. The rotating rack 1 has a hollow fiber membrane module case 4
Is fixed, and an adhesive jig 7 is fixed to both ends of the hollow fiber membrane module case 4 by a holding jig 6.

An adhesive container 11 containing an adhesive such as an epoxy resin or a urethane resin is connected to the bonding jig 7 by an injection tube 8 serving as a pipe. In addition, a ball valve or a butterfly valve serving as a valve means is provided in the nozzle 5 of the hollow fiber membrane module case 4 with a flexible resin container 12 containing a flexible resin having flexibility such as urethane resin and silicone resin. Are connected by an injection tube 9 serving as a pipe via an air drive valve 10 composed of the above.

A rotary seal 14 is provided on the cover 17 so that the rotary rack 1 and the rotary shaft 2 are aligned. The rotary seal 14 is provided from outside the rotary rack 1 as a rotary body by a compressor (not shown). The generated compressed air flows through the air pipe 16 and is supplied through the operation lever 15, and is further supplied from the rotary seal 14 to the air pipe 13.
The air is supplied to the air-driven valve 10 through.

By operating the operation lever 15, the rotation of the rotary rack 1 is stopped by supplying compressed air from outside the rotary rack 1 through the air pipe 13 provided on the rotary shaft 2 of the rotary rack 1. No air driven valve
10 can be opened and closed, and the flow path of the injection tube 9 can be opened and closed via the air-driven valve 10.

A specific example of a hollow fiber membrane module manufactured by the two-layer centrifugal bonding apparatus A for a hollow fiber membrane module having the above configuration will be described with reference to FIGS. First, 2350 polyacrylonitrile hollow fiber membranes 18 having a molecular weight cut off of 13000 and a fiber outer diameter of 1.35 mm were bundled, the ends of which were sealed, and the inner diameter was 3 inches (about 83 mm) made of PVC. The hollow fiber membrane module case 4 is filled, and the end of the hollow fiber membrane module case 4 is bonded to the end portion of the hollow fiber membrane module case 4 by the holding jig 6.
Is fixed.

An adhesive container 11 is connected to the bonding jig 7 by an injection tube 8, and the nozzle 5 of the hollow fiber membrane module case 4 is
Is connected to a flexible resin container 12 via an injection tube 9 via an air drive valve 10.

The adhesive container 11 is filled with 260 g of a two-part epoxy resin 11a serving as an adhesive, and the flexible resin container 12 is filled with a two-part silicone resin 12a serving as a flexible resin.
The centrifugal bonding is started in a state in which 55 g of a is filled and the air-driven valve 10 is closed. At this time, the inside of the centrifugal bonding apparatus A was kept at 35 ° C., and the rotary rack 1 was rotated at 300 rpm to perform centrifugal bonding. At this time, an epoxy resin 11a serving as an adhesive is injected from the adhesive container 11.

Then, when the rotation of the carousel 1 is started, 5
One minute later, the air-driven valve 10 was opened, and a silicone resin 12a to be a flexible resin was injected from the flexible resin container 12. After 7 hours from the start of the rotation of the rotating rack 1, the rotation of the rotating rack 1 was stopped and the hollow fiber membrane module was taken out of the centrifugal bonding apparatus A. The epoxy resin 11a and the silicone resin 12a were hardened to the extent that they did not flow. Was.

Here, the injection amount and the injection start time of the adhesive and the flexible resin are determined by the size of the hollow fiber membrane module to be manufactured,
Filling rate of hollow fiber membrane bundle, tube diameter, adhesive injection speed,
Predetermined conditions are set according to the type of the adhesive, the type of the flexible resin, and the like.

When the hollow fiber membrane module manufactured as described above was cut in the longitudinal direction and the cross section of the bonded portion was observed, the epoxy resin 11a and the silicone resin 12a were observed.
Is divided into two layers up to the inside of the 18 hollow fiber membranes, and the hollow fiber membrane
It was confirmed that the film was hardened by forming an interface substantially perpendicular to the longitudinal direction of No. 18.

Next, the hollow fiber membrane module 2 of the present invention
As another configuration of the layer centrifugal bonding apparatus, the air-driven valve 10
Instead of an air driven cylinder valve as shown in FIG.
21 can also be used. Air driven cylinder valve 21
The pressing member 22 moves up and down by compressed air supplied through the air pipe 13 to press the elastic injection tube 9 from outside, or to release the pressing to close or open the injection tube 9. Has become.

When the above-described air-driven valve 10 such as a ball valve and a butterfly valve is used, in order to remove the silicone resin 12a hardened inside the air-driven valve 10, an operation such as disassembly of the air-driven valve 10 body is required. If an air-driven cylinder valve 21 is used, the silicone resin 12a hardened inside the injection tube 9 may be used.
It is good to remove and replace every time, and workability is good.

[0032]

As described above, the present invention has the above-described structure and operation, so that the two-layer centrifugal bonding between the adhesive and the flexible resin can be performed without stopping the rotation of the rotating body of the centrifugal bonding apparatus. By performing the process, the bonding time can be significantly reduced.

Further, since the flexible resin penetrates deeply between the hollow fiber membrane bundles, the effect of protecting the adhesive interface can be enhanced.

[Brief description of the drawings]

FIG. 1 is a schematic view showing the configuration of a two-layer centrifugal bonding apparatus for a hollow fiber membrane module according to the present invention.

FIG. 2 is a partially enlarged view showing a state in which the ends of the hollow fiber membrane bundle are bonded in two layers by an adhesive and a flexible resin.

FIG. 3 is a diagram showing a configuration of an air-driven cylinder valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rotating rack 2 ... Rotating shaft 3 ... Rotating means 4 ... Hollow fiber membrane module case 5 ... Nozzle 6 ... Holding jig 7 ... Adhesive jig 8,9 ... Injection tube 10 ... Air drive valve 11 ... Adhesive container 11a ... Epoxy resin 12 ... Flexible resin container 12a ... Silicone resin 13 ... Air piping 14 ... Rotary seal 15 ... Operation lever 16 ... Air piping 17 ... Cover 18 ... Hollow fiber membrane 21 ... Air driven cylinder valve 22 ... Pressing member A ... Centrifugal Bonding equipment

Claims (3)

[Claims] 1. A large number of hollow fiber membrane ends are fixed with an adhesive,
In a two-layer centrifugal bonding apparatus for a hollow fiber membrane module, which manufactures a hollow fiber membrane module in which the inside of the bonding portion at the end of the hollow fiber membrane is covered with a flexible resin layer to reinforce the hollow fiber membrane at the bonding interface, A valve that opens and closes a flow path of a pipe between a hollow fiber membrane module case that accommodates a membrane and is rotatable fixed to a rotating body and a flexible resin container that contains a flexible resin. A two-layer centrifugal bonding apparatus for a hollow fiber membrane module, characterized by comprising means. 2. The valve means connects the hollow fiber membrane module case and the flexible resin container to each other by supplying compressed air from the outside of the rotator through an air pipe provided on a rotation shaft of the rotator. The two-layer centrifugal bonding apparatus for a hollow fiber membrane module according to claim 1, wherein an air-driven valve that can open and close a flow path of a pipe to be connected is provided. 3. The valve means supplies compressed air from outside of the rotating body through an air pipe provided on a rotating shaft of the rotating body, thereby connecting the hollow fiber membrane module case and the flexible resin container to each other. The two-layer centrifugal bonding apparatus for a hollow fiber membrane module according to claim 1, wherein an air-driven cylinder valve capable of opening and closing a flow path of a pipe to be connected is provided.