JP2009189903A - Manufacturing method of hollow fiber membrane module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a hollow fiber membrane module, which can manufacture by potting molding at low costs without producing the non-penetration of a resin between hollow fiber membranes, the crack of a bonded and fixed part, the non-uniformity of the interface of the fixed part, or the like. <P>SOLUTION: A distribution plate provided with a plurality of injection holes is arranged inside a potting container, and the potting resin is injected into the hollow fiber membrane bundle in the state that the distribution plate and the end face of the hollow fiber membrane bundle keep a contact. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a hollow fiber membrane module, and more particularly to a method for manufacturing a hollow fiber membrane module in which a hollow fiber membrane bundle is housed in a housing case and bonded and fixed with a resin by centrifugal potting.

  Hollow fiber membrane modules used for water purification and other treatments bundle bundles of hundreds to tens of thousands of hollow fiber membranes, store them in a cylindrical housing case, and fix the ends with resin Consisting of As a method of bonding and fixing the hollow fiber membrane bundle and the housing case, centrifugal potting method in which liquid uncured resin is infiltrated between the hollow fiber membranes using centrifugal force, and liquid uncured resin is measured with a metering pump, head, etc. There is a stationary potting method in which the liquid is fed and naturally permeated between the hollow fiber membranes.

  When trying to manufacture a hollow fiber membrane module by the latter stationary potting method, there is an advantage that a hollow fiber membrane module can be manufactured at low cost because a special and large-sized device is not required. However, the penetration of the potting resin between the hollow fiber membranes is likely to be uneven, and it is difficult to increase the filling rate of the hollow fiber membranes, and the heat generated by the hardening of the potting resin cannot be sufficiently dissipated. .

  As a countermeasure against uneven penetration of the potting resin, for example, Patent Document 1 discloses a method for improving the dispersion / penetration of the potting resin using a plurality of branch pipes. In the method described in Patent Document 1, branching piping is provided in a potting container, and the potting resin is uniformly dispersed and permeated by injecting the potting resin from a plurality of injection holes.

  On the other hand, the centrifugal potting method is preferable in that it is relatively easy to cope with a high filling rate.

However, the potting resin injection rate tends to be higher than the penetration rate of the potting resin into the hollow fiber membrane bundle, and when this becomes prominent, only the potted resin is present at the end of the housing, and the potting resin is present. A hollow fiber membrane bundle having a specific gravity generally lower than that of the resin will float on the uncured resin layer without being sufficiently immersed in the potting resin. This phenomenon not only causes uneven penetration of the potting resin but also causes leakage.
JP 2003-62436 A

  Here, by applying the centrifugal potting method to the method described in Patent Document 1, it is considered that the potting resin can be more uniformly and highly filled. However, since the inflow rate of the potting resin cannot be sufficiently reduced simply by injecting the resin by centrifugation using a branch plate provided with injection holes at a plurality of locations, the above-described lifting of the hollow fiber membrane by the injected resin Frequently occurs, and the hollow fiber membrane bends accordingly.

  The object of the present invention is to solve the above-mentioned problems without causing resin impermeation between the hollow fiber membranes, cracks in the adhesive fixing part or non-uniformity in the fixing part interface in the hollow fiber membrane module. Another object of the present invention is to provide a method for manufacturing a hollow fiber membrane module that can be manufactured by potting molding at low cost.

  The present invention employs the following means in order to solve such problems.

The method for producing a hollow fiber membrane module according to the present invention includes:
The hollow fiber membrane bundle is housed in a housing case, a potting container is attached to the end of the hollow fiber membrane bundle, and the potting resin is added to the housing case while generating centrifugal acceleration from the center to the end of the housing case. A method for producing a hollow fiber membrane module, which is supplied to a potting container and at least one end of the housing case is bonded and fixed to the hollow fiber membrane and the housing case with the potting resin.
Arranging a distribution plate provided with a plurality of injection holes inside the potting container,
Injecting the potting resin into the hollow fiber membrane bundle in a state where the distribution plate and the end face of the hollow fiber membrane bundle are in contact with each other,
The diameter of the injection hole is 0.5 mm or more and 2 mm or less.

  Further, the aperture ratio of the distribution plate is preferably 10% or more and 30% or less.

  Moreover, it is preferable that a centrifugal acceleration is 20 times or more of a gravitational acceleration.

  The potting resin preferably has an initial viscosity in the range of 100 to 2,000 mPa · s.

  The potting resin is preferably an epoxy resin.

  According to the present invention, it is possible to manufacture a hollow fiber membrane module without causing resin impermeation between the hollow fiber membranes, cracks in the adhesive fixing part, non-uniformity in the interface of the potting part, and the like.

The method for producing a hollow fiber membrane module according to the present invention includes:
The hollow fiber membrane bundle is housed in a housing case, a potting container is attached to the end of the hollow fiber membrane bundle, and the potting resin is added to the housing case while generating centrifugal acceleration from the center to the end of the housing case. A method for producing a hollow fiber membrane module, which is supplied to a potting container and at least one end of the housing case is bonded and fixed to the hollow fiber membrane and the housing case with the potting resin.
Arranging a distribution plate provided with a plurality of injection holes inside the potting container,
Injecting the potting resin into the hollow fiber membrane bundle in a state where the distribution plate and the end face of the hollow fiber membrane bundle are in contact with each other,
The diameter of the injection hole is 0.5 mm or more and 2 mm or less.

  The manufacturing method of the hollow fiber membrane module according to the present invention causes problems such as unevenness in the adhesive fixing interface after potting is completed by causing non-uniformity in resin penetration between the hollow fiber membranes. The manufacturing method of the hollow fiber membrane module which is not present can be provided.

(Potting resin)
The potting resin is used for adhering and fixing one end or both ends of the hollow fiber membrane accommodated in the housing case to the housing case. In the present invention, for example, an epoxy resin can be used. As the main agent, any one having two or more epoxy groups in one molecule can be used. For example, although not particularly limited, bisphenol type epoxy resin, novolac type epoxy resin, naphthalene type epoxy resin, biphenyl type epoxy resin, triphenol alkane type epoxy resin, phenol aralkyl type epoxy resin, cyclopentadiene type epoxy resin, etc. Can be mentioned. The present invention is particularly useful when a bisphenol type epoxy resin is used as a potting resin. As the curing agent, for example, aliphatic amines, aromatic amines, organic acid anhydrides or modified amines can be used, and among these, aliphatic polyamines are preferably used. Further, a reaction retarder may be added in order to suppress the progress of the reaction.

  An example of an epoxy resin that can be used in the present invention includes, for example, “Araldite 2020” (trade name) manufactured by Huntsman Advanced Materials. The main agent (agent A) has a viscosity of about 150 mPa · s (23 ° C.) and a specific gravity of about 1.12. The viscosity of the curing agent (B agent) is about 150 mPa · s (23 ° C.), and the specific gravity is about 0.95. The mixture has a viscosity of about 150 mPa · s (23 ° C.) and a specific gravity of about 1.1. The curing time of the potting resin is preferably one that can be cured within 48 hours at room temperature, and one that can be cured within 24 hours is more preferable in terms of production efficiency.

  Generally, an epoxy resin shrinks when cured, and the cured product is likely to be distorted (cured internal strain). This distortion of the cured product tends to cause defects such as cracking.

  The potting resin hermetically seals between the hollow fiber membrane and the hollow fiber membrane and between the hollow fiber membrane and the housing case at the end of the housing case. In the present invention, the potting resin is injected by centrifugal potting.

  In order to well pot (bond and solidify) the hollow fiber membrane bundle to the housing case using the centrifugal potting method, inject the potting resin evenly between the hollow fiber membranes so that the potting resin is not unevenly distributed in the potting part. Is preferred. If the potting resin is injected non-uniformly and unevenly distributed, the temperature increase accompanying the curing reaction occurs excessively in a portion where the resin amount is large, which may cause cracking.

  The potting resin preferably has a low viscosity because the potting resin is less likely to penetrate into the hollow fiber membrane bundle (between the hollow fiber membrane and the hollow fiber membrane) when the potting resin has a high viscosity. The specific viscosity is preferably 100 to 2,000 mPa · s. Further, the viscosity of the potting resin is preferably a viscosity that does not impair the pouring property to the potting part, and is a viscosity that can penetrate into the void part of the hollow fiber membrane. The void portion of the hollow fiber membrane is a hollow portion formed in order to provide a filtration function in the thick portion between the surface and the inner surface of the hollow fiber membrane. When the potting resin penetrates into the voids in the hollow fiber membrane, an anchor effect is exhibited and the adhesive strength is enhanced. If the amount of resin penetrating into the void in the membrane is too large, the resin may pass through the hollow fiber membrane and reach the hollow portion, the filtered water will not flow, and the permeation performance of the hollow fiber membrane module may be reduced. . Moreover, when it does not osmose | permeate, adhesiveness with a film | membrane will fall, and a film | membrane and resin may peel depending on the case. The amount of permeated water and the separation performance are determined by the pore size and pore formation distribution of the cavity.

  In general, fillers may be mixed with potting resin to suppress heat generation by reaction and reduce shrinkage stress to make it difficult for cracking of the potting resin after curing or peeling from the case to occur. Is not preferable because it becomes a problem.

(Hollow fiber membrane)
The hollow fiber membrane is not particularly limited, and various hollow fiber membranes can be used. For example, hollow fiber membranes made of various materials such as polyethylene, polypropylene, polyacrylonitrile, polysulfone, and polyvinylidene fluoride can be used. Further, it is preferable that the diameter of the micropores on the surface of the hollow fiber membrane is 1 μm or less, particularly 0.005 to 0.5 μm. This is because fine particles and suspended substances can be efficiently removed, and high blocking performance can be exhibited against bacteria and viruses.

  Moreover, when aiming at permeation | transmission of gas etc., the hollow fiber membrane which has the micropore of the diameter of 1 micrometer or less, especially 0.005-0.5 micrometer on the surface is preferable. Examples thereof include a polyolefin-based hollow fiber membrane for gas permeation such as polypropylene or polyethylene composed of two or three layers including a non-porous homogeneous layer having gas permeation performance.

(Potting container)
The potting container is provided with a distribution plate therein, and is configured to be attachable to a hollow fiber membrane bundle stored in a housing case. The potting resin is supplied from the resin pot to the potting container by centrifugal force, and further injected into the hollow fiber membrane bundle through the distribution plate.

(Distribution plate)
The distribution plate is disposed in the potting container in order to uniformly inject the potting resin into the hollow fiber membrane bundle. The distribution plate is provided with a plurality of injection holes, and the potting resin is uniformly injected into the hollow fiber membrane bundle through the plurality of injection holes. The distribution plate in the present invention is not particularly limited as long as it has a plurality of injection holes and has a predetermined opening diameter. For example, plastic or metal can be used, but a punching plate made of a metal such as an aluminum alloy or stainless steel is preferable because it is widely distributed and is less affected by heat.

  The potting resin injection hole provided in the distribution plate has an opening diameter of 0.1 to 2 mm. Moreover, as a hole area rate, a thing of about 10 to 30% is preferable. Furthermore, it is preferable that the injection holes having the same diameter are provided evenly distributed at almost equal intervals. Note that the hole area ratio is the ratio of the area of the opening portion to the area of the distribution plate before the hole is formed (the area of the distribution plate when the hole is not opened, for example, radius × radius × circumference ratio) ( %).

  If the aperture diameter is 2 mm or less, the injection rate (Vp) into the potting container is smaller than the penetration rate (Vm) of the potting resin into the hollow fiber membrane bundle, and the hollow fiber membrane bundle having a small specific gravity is not pushed up. The hollow fiber membrane is bent inside the housing case and does not cause a leak.

  When the aperture diameter is 0.1 mm or more, Vp does not become significantly smaller than Vm, and the time required for sufficiently injecting the resin can be suppressed. Further, it is within a range that can be produced without any problem in producing the distribution plate.

  When the open area ratio is 30% or less, Vp tends to be easily made smaller than Vm, and pushing up of a hollow fiber membrane bundle having a small specific gravity tends to be suppressed.

  When the open area ratio is 10% or more, Vp is not significantly smaller than Vm, and the time required to sufficiently inject the resin can be suppressed.

  The distribution plate is installed in the potting container, and is arranged so as to contact the end surface of the hollow fiber membrane bundle when the potting container is attached to the hollow fiber membrane bundle. When the distance between the distribution plate and the hollow fiber membrane bundle is increased, for example, when the inflow pipe to the potting container is arranged at the center of the potting part, the inflow from the part facing in the longitudinal direction of the module increases. Phenomena such as hollow fiber membrane bundles sinking in the vicinity occur and are not preferable. In addition, it is preferable to dispose the distribution plate in contact with the end face of the hollow fiber membrane bundle in terms of positioning of the hollow fiber membrane bundle before resin injection.

  Further, it is not necessary to provide a pipe that reaches the injection hole of the distribution plate inside the potting container in the present invention. By providing a distribution plate having the plurality of injection holes in the potting container and using centrifugal force, the potting resin can be uniformly injected into the hollow fiber membrane bundle.

(Centrifugal potting method)
Since the present invention employs the centrifugal potting method, it is preferable to use a configuration in which the potting resin is supplied from the resin pot to the potting container using a centrifugal force because the apparatus configuration is simplified. Specifically, for example, first, the housing case 30 in which the hollow fiber membrane bundle 20 is accommodated is attached to the centrifugal potting apparatus as shown in FIG. 1, and the potting container 32 is attached to the end face of the hollow fiber membrane bundle 20.
When the apparatus is rotated, the potting resin is supplied from the resin pot 33 to the potting container 32 through the liquid feeding tube 34. Since the distribution plate 35 is installed in the potting container 32, the potting resin is injected into the hollow fiber membrane bundle 20 through a plurality of injection holes provided in the distribution plate 35. By adopting the centrifugal potting method, it is possible to fill the potting resin with high density without generating a gap (an impervious portion of the potting resin) between the hollow fiber membranes.

  The liquid feeding tube 34 is not particularly limited, but a polyethylene tube having an inner diameter of 2 to 6 mm is preferably used. If this tube is too thicker than 6 mm, the amount of resin sent out from the resin pot 33 due to centrifugal force increases, and a distribution plate finer than 0.5 mm in hole diameter is required, but processing is difficult. Also, it is not preferable to process a tube having an inner diameter smaller than 2 mm because the processing is difficult and the strength decreases.

  The amount of potting resin can be increased according to the required pressure resistance. However, if the amount of potting resin is too large, the pressure applied to the liquid feeding tube increases, and the membrane easily bends and generates heat. Since the curing time is shortened due to the increase in the thickness of the resin, the resin may be cured before it is sufficiently spread, and it is preferable to suppress the resin to 200 g or less per each end face.

  The centrifugal acceleration applied during potting is preferably 20 times or more than the gravitational acceleration. If it is less than this, the amount of potting resin injected per unit time decreases, and the reaction heat generation amount decreases. In addition, the potting interface may not be parallel to the end face of the hollow fiber membrane bundle due to the gravity applied to the potting resin itself, and a thin portion of the resin layer may be formed in the potting portion, thereby forming a weak pressure-resistant portion. . The potting interface is the surface of the housing case in the hollow region side of the cured potting resin layer.

  The inclination θ (angle with respect to the potting end face) of the potting interface on the hollow fiber membrane bundle side is preferably as small as possible, and particularly preferably 10 ° or less. By producing the hollow fiber membrane module so as to be within that range, it is possible to prevent a potting length difference (a difference between a thick part and a thin part in the potting part) of 20% or more of the inner diameter of the potting part from occurring. .

The centrifugal acceleration G (multiple of gravitational acceleration) is calculated using the following formula (I).

Centrifugal acceleration G = 11.18 × (N / 1000) ² × R Formula (I)
(R: rotation radius = distance from rotation axis to module end (cm), N: rotation speed (rpm))
For example, when the center of a housing case having a total length of 24 cm is rotated as an axis, the rotation radius becomes 12 cm, and a centrifugal acceleration of 27.2 G can be obtained by setting the rotation speed to 450 rpm.

(Housing case)
The material of the housing case can be appropriately selected and used from appropriate materials such as metals and plastics. For example, vinyl chloride resin, acrylonitrile / ethylene propylene rubber / styrene (AES) resin, acrylonitrile / acrylic rubber / styrene (AAS) resin or polysulfone resin can be preferably used.

  In the present invention, the filling rate of the hollow fiber membrane, that is, the filling rate of the hollow fiber membrane, which is defined as the ratio of the outer contour area of the cross section of the hollow fiber membrane to the transverse area of the case inner wall, is preferably 45 to 65. % Should be in the range.

(Method for producing hollow fiber membrane module)
Next, a preferred method for producing a hollow fiber membrane module of the present invention will be described with reference to FIGS.

  First, the housing case 30 is washed with toluene, and surface treatment and primer application are performed according to the material. As preparation of the hollow fiber membranes, a predetermined number of hollow fiber membranes 21 are each knitted by Russell knitting to form a hollow fiber membrane bundle 20. The hollow fiber membrane bundle 20 is inserted and accommodated in the case 30 so as to slide on the housing case 30. At this time, since each hollow fiber membrane 21 is in a state of being restrained by the fixing member 50 for bonding and the case housing 30, it is prevented from spreading and bending.

  Thereafter, heat treatment is performed so as to have a predetermined length. This has the purpose of reducing the damage at the time of film insertion by making it constant length and heat treatment. Even if it is inserted while being crushed by mistake during insertion, it makes sense to make it possible to remove the wrinkles by heating.

  Then, the housing case 30 containing the hollow fiber membrane bundle 20 is attached to a centrifugal potting resin injection device (centrifugal potting device). Then, a potting container 32 is attached to an end portion (opening surface) on the opening end portion side of the hollow fiber membrane bundle 20 in the housing case 30. At that time, a distribution plate (for example, made of aluminum) substantially equal to the inner diameter of the potting container is placed in the potting container so as to be in contact with the hollow fiber membrane bundle 20. Then, the centrifugal potting device is operated, the potting resin is injected into the hollow fiber membrane bundle 20 by centrifugal force, and solidified while applying centrifugal force, thereby forming the potting portion 40.

  Then, after curing for bringing out the final physical properties to the potting portion 40 and solidifying, the end surface of the potting portion 40 on the opening end side of each hollow fiber membrane 21 is cut to form a flat surface, and each hollow Open the end of the thread membrane. Thereby, even if the opening end of the hollow fiber membrane 21 is blocked by the potting material, it is removed and the opening end can be exposed to the outside of the case 30. Then, the cap 13 etc. are attached and the hollow fiber membrane module 10 is manufactured.

  Hereinafter, the present invention will be described in more detail based on examples. The present invention is not particularly limited to the following examples.

Example 1
(Hollow fiber membrane)
A high density polyethylene “Suntech HD B161” (trade name, manufactured by Asahi Kasei Chemicals Corporation) was used as a raw material for the hollow fiber membrane. First, spinning was performed using a hollow fiber membrane nozzle to obtain an unstretched hollow fiber. This unstretched hollow fiber was annealed at 118 ° C., then stretched 1.25 times at 23 ± 2 ° C., and subsequently stretched 4.3 times in a heating furnace at 100 ° C. Furthermore, a relaxation step of 0.3 times was provided in a heating furnace at 100 ° C., and finally, the hollow fiber membrane 21 having a pore diameter of 0.05 μm was obtained by shaping so that the total draw ratio was 4 times.

(Housing case)
A housing case 30 made of polypropylene (Nippon Polypro “Wintec WMG03” MFR 30 g / 10 min · 210 ° C.) having an overall length of 215 mm and an inner diameter of 74φ was used. An epoxy resin “Araldite 2020” (trade name) manufactured by Huntsman Advanced Materials, which is the same material as the potting resin, is applied to the screw portion 31, and an aluminum alloy bonding fixing member 50 having an outer diameter φ80 to an inner diameter φ74 is applied. Was fixed by screwing about 3 mm away from the end of the housing case 30.

  A hollow fiber membrane having a three-layer structure was made into a Russell knitting to produce a hollow fiber membrane bundle 20 and inserted into the housing case 30. Further, the treatment was performed at 100 ° C. below the softening point of the support layer so as to have a predetermined length in a dry incubator so that the relaxation rate was approximately 0.5% or less. At that time, the filling rate of the hollow fiber membrane was 53%.

(Distribution plate)
As the distribution plate 35, an aperture diameter (diameter) of 1 mm, a distance between hole centers of 2 mm, a plate thickness of 1 mm, an aperture ratio of 23%, and an aluminum alloy were used. The distribution plate 35 was placed in the potting container 32 so as to contact the hollow fiber membrane bundle 20 of the housing case 30, and the potting container was set in the housing case 30.

(Potting resin)
An epoxy resin “Araldite 2020” (trade name) manufactured by Huntsman Advanced Materials was used as the potting resin, and the hollow fiber membrane bundle was adhered and solidified.

(Manufacture of hollow fiber membrane modules)
The apparatus used was a centrifugal membrane module manufacturing apparatus (FIG. 1). Then, the potting portion is rotated for 8 hours at 450 rpm (× 28 g) with a rotation radius of 125 mm (including the potting container 20 mm) around the center portion of the housing case 30 so that 90 g of potting resin is filled in each end portion. Formed.

  After the potting portion was solidified, curing was performed at 40 ° C. for 7 hours. The end of the housing case 30 was opened with a large cutter, the cap 13 was attached, and a hollow fiber membrane module was manufactured.

(Example 2)
A hollow fiber membrane module was produced in the same manner as in Example 1 except that the aperture diameter of the distribution plate was 0.5 mm.

(Example 3)
A hollow fiber membrane module was produced in the same manner as in Example 1 except that a three-layer gas permeable hollow fiber membrane having gas permeability was used. As a method for producing a three-layer hollow fiber membrane for gas permeation, polypropylene “Novatech PP FY6H” (trade name, manufactured by Nippon Polypro Co., Ltd.), soft polypropylene resin “Zeras 7023” (trade name, (Mitsubishi Chemical Co., Ltd.) was used for spinning using a nozzle for a three-layer structure to obtain an unstretched hollow fiber. This unstretched hollow fiber was annealed at 140 ° C., then stretched 1.25 times at 23 ± 2 ° C., and then stretched 3.3 times in a 130 ° C. heating furnace. Furthermore, a relaxation step of 0.3 times was provided in a heating furnace at 130 ° C., and finally a gas permeable hollow fiber membrane was formed so that the total draw ratio was 3 times.

(Comparative Example 1)
A hollow fiber membrane module was produced in the same manner as in Example 1 except that it was produced without using a distribution plate.

(Comparative Example 2)
A hollow fiber membrane module was produced in the same manner as in Example 1 except that the distribution plate was not used and the centrifugal force at the time of molding was changed to 17 g (rotation number: 350 rpm).

(Comparative Example 3)
A hollow fiber membrane module was produced in the same manner as in Example 1 except that a distribution plate having a hole diameter of 10 mm, 12 holes, and a hole area ratio of 22% was used.

(Evaluation methods)
In order to see the degree of bending of the hollow fiber membrane at the potting portion, the amount of lift of the membrane from the distribution plate (mm) in the potting resin layer (hereinafter abbreviated as “lift amount”) was measured.

  In this evaluation, when the hollow fiber membrane bundle is put into the housing case, it is put in a form that is not loosened. Therefore, an increase in the inflow speed (increase in inflow pressure) at a specific portion of the potting resin Cause bending. As a result, the end of the membrane bundle is moved in the longitudinal direction of the module by the bending amount. The amount of bending of the hollow fiber membrane bundle can be simply expressed by the distance from the end of the hollow fiber membrane bundle to the distribution number.

  As shown in FIG. 3, the lifting amount (mm) is a distance 41 between the distribution plate 35 and the hollow fiber membrane 21 after the potting resin is injected and cured.

  In addition, in order to see whether the potting interface is not parallel to the plane parallel to the opening surface of the housing case and a thin portion of the potting resin is generated, the potting interface angle (°) (hereinafter referred to as potting interface angle) Abbreviated). As shown in FIG. 4, the potting interface angle (°) indicates the boundary line YY where the potting resin exists inside the module and the housing case when the manufactured hollow fiber membrane module is divided into longitudinal sections in the direction of the centrifugal axis. The angle 42 formed with the opening plane XX was the potting interface angle (°).

  Table 1 summarizes the results of measuring the amount of lift (mm) and potting interface angle (°) of the hollow fiber membrane for each example.

It is the schematic which shows the state which attached the housing case which accommodated the hollow fiber membrane bundle in the centrifugal potting apparatus, and attached the potting container to the hollow fiber membrane bundle. It is sectional drawing of a hollow fiber membrane module. It is a figure which shows the location measured as lifting amount (mm). It is a figure which shows the location measured as a potting interface angle (degree).

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hollow fiber membrane module 11 Process target liquid inlet 12 Process liquid (filtrate) outlet 13 Cap 20 Hollow fiber membrane bundle 21 Hollow fiber membrane 22 Relief part at the time of screw processing 23 Open end 30 Case housing 31 Screw part 32 Potting container 33 Resin Pot 34 Liquid feeding tube 35 Distribution plate 36 Injection hole 37 Injection direction of potting resin 40 Potting part 41 Lifting amount (mm)
42 Potting interface angle (°)
50 Fixing member for bonding

Claims (5)

The hollow fiber membrane bundle is housed in a housing case, a potting container is attached to the end of the hollow fiber membrane bundle, and the potting resin is added to the housing case while generating centrifugal acceleration from the center to the end of the housing case. A method for producing a hollow fiber membrane module, which is supplied to a potting container and at least one end of the housing case is bonded and fixed to the hollow fiber membrane and the housing case with the potting resin.
Arranging a distribution plate provided with a plurality of injection holes inside the potting container,
Injecting the potting resin into the hollow fiber membrane bundle in a state where the distribution plate and the end face of the hollow fiber membrane bundle are in contact with each other,
The method for producing a hollow fiber membrane module, wherein the diameter of the injection hole is 0.5 mm or more and 2 mm or less.   2. The method for producing a hollow fiber membrane module according to claim 1, wherein an aperture ratio of the distribution plate is 10% or more and 30% or less.   The method for producing a hollow fiber membrane module according to claim 1 or 2, wherein the centrifugal acceleration is 20 times or more of gravitational acceleration.   4. The method for producing a hollow fiber membrane module according to claim 1, wherein an initial viscosity of the potting resin is in a range of 100 to 2,000 mPa · s. 5.   The method for producing a hollow fiber membrane module according to any one of claims 1 to 4, wherein the potting resin is an epoxy resin.