CN112808013A - Hollow fiber membrane module end-sealing treatment structure and treatment method thereof - Google Patents
Hollow fiber membrane module end-sealing treatment structure and treatment method thereof Download PDFInfo
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- CN112808013A CN112808013A CN202110227505.1A CN202110227505A CN112808013A CN 112808013 A CN112808013 A CN 112808013A CN 202110227505 A CN202110227505 A CN 202110227505A CN 112808013 A CN112808013 A CN 112808013A
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/02—Hollow fibre modules
- B01D63/021—Manufacturing thereof
- B01D63/022—Encapsulating hollow fibres
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Abstract
The invention discloses a hollow fiber membrane module end-sealing processing structure which is completed in a mold and comprises an isolation layer arranged on the mold before epoxy resin glue is cast. Its end-capping method is also disclosed. According to the invention, the isolating layer is pre-cast between the die for positioning the hollow fiber membrane yarns and the epoxy resin layer, so that the die can be repeatedly used, and the smoothness of the hollow fiber membrane yarns is ensured. Secondly, the polyurethane layer is cast at the root of the membrane filament of the membrane component, so that the inferior property that the membrane filament is easy to damage can be avoided. The invention has simple and efficient operation and reduces the production cost.
Description
Technical Field
The invention relates to a hollow fiber membrane module end-sealing processing structure and a processing method thereof, in particular to a membrane module end-sealing structure and a processing method thereof, wherein the membrane module end-sealing processing structure uses a mold, a low-melting-point solid (such as polyethylene glycol 200-3000) or a fluid (such as a membrane casting solution) which can generate phase change for pre-end-sealing processing, and uses polyurethane to process the root part of a hollow fiber membrane wire.
Background
Membrane modules are assemblies of membrane applications, which are the core of membrane technology. In particular, hollow fiber membrane modules have advantages such as high packing density and high working efficiency, and are industrially used on a large scale. The existing general end sealing method of the membrane assembly is to use epoxy resin to cast and bond sealed hollow fiber membrane filaments and hollow fiber membrane filaments with an external member, but because the epoxy resin has good fluidity, the end opening of the hollow fiber membrane filaments is not tightly sealed, and the epoxy resin can permeate into the hollow fiber membrane filaments in the casting process to cause membrane hole blockage, so that the filtration effective holes of the hollow fiber membrane filaments are reduced.
There have been three problems with industrially produced hollow fiber membrane modules: firstly, the effective filtration pores of the hollow fiber membrane filaments of the membrane component are unknown or difficult to detect; secondly, the root of the hollow fiber membrane filament of the membrane component is easily damaged due to vibration in the using process; thirdly, the hollow fiber membrane filaments are unevenly distributed in the membrane module (which is impossible to be even due to random placement) or the used mould is mostly disposable. Thereby reducing the use efficiency of the membrane component, shortening the service life and increasing the production cost.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a membrane module end-sealing processing structure and a processing method thereof, which can solve the problems of the blockage of hollow fiber membrane filaments, the damage of the roots of the hollow fiber membrane filaments, and the repeated use of a mold.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a hollow fiber membrane module end-sealing processing structure, which is completed in a mold and comprises an isolation layer arranged on the mold before epoxy resin glue is cast.
The hollow fiber membrane wire assembly is characterized by further comprising a sealing layer arranged at the end part of the hollow fiber membrane wire assembly, wherein the sealed hollow fiber membrane wire is inserted into a mold preset with an isolating layer and two ends of the membrane assembly are fixed; and then casting epoxy resin to form the epoxy resin glue layer.
Further, the sealing layer is an adhesive layer.
Furthermore, the glue layer is formed by quick-drying glue.
Further, the isolation layer is formed by performing a pre-casting treatment by using a low-melting-point solid or a fluid capable of undergoing a phase change.
Further, the low-melting-point solid is polyethylene glycol 200-3000.
Further, the fluid capable of undergoing phase change is a casting solution.
Furthermore, the epoxy resin glue layer is a cast epoxy resin glue.
Furthermore, the hollow fiber membrane comprises a root strengthening layer arranged at the root of the hollow fiber membrane wire.
Further, the root reinforcing layer is a polyurethane layer formed by casting polyurethane on the root of the hollow fiber membrane yarn after casting the epoxy resin glue.
A hollow fiber membrane module end-sealing treatment method comprises the following steps:
s1, sealing the port of the hollow fiber membrane wire by using quick-drying glue, inserting the sealed hollow fiber membrane wire into a die and fixing the two ends of the membrane assembly;
s2, performing precast treatment by using low-melting-point solid or fluid capable of generating phase change to obtain an isolation layer above the mold;
s3, casting epoxy resin glue, removing the mould after the epoxy resin is cured, opening the membrane hole, modifying the port of the membrane filament and reinforcing the root of the membrane filament by using polyurethane.
Compared with the prior art, the invention has the beneficial technical effects that:
according to the invention, the isolating layer is pre-cast between the die for positioning the hollow fiber membrane yarns and the epoxy resin layer, so that the die can be repeatedly used, and the smoothness of the hollow fiber membrane yarns is ensured. Secondly, the polyurethane layer is cast at the root of the membrane filament of the membrane component, so that the inferior property that the membrane filament is easy to damage can be avoided. The invention has simple and efficient operation and reduces the production cost.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a schematic view of an end-capping treatment structure of a hollow fiber membrane module according to the present invention;
FIG. 2 is a schematic view of a mold;
description of reference numerals: 1-an isolation layer; 2-an epoxy resin layer; 3-hollow fiber membrane filaments; 4, molding; 5-root strengthening layer; 6-metal/plastic plate; 7-film thread positioning hole.
Detailed description of the preferred embodiments
As shown in fig. 1, a hollow fiber membrane module end-capping treatment structure includes:
the sealing layer is arranged at the end opening of the hollow fiber membrane yarn;
inserting the sealed hollow fiber membrane wire assembly into a mold and fixing the two ends of the membrane assembly to form an isolation layer 1; and the epoxy resin layer 2 formed by continuous pouring;
the sealing layer is a glue layer, and the glue layer is formed by quick-drying glue. The isolation layer 1 is formed by performing pre-casting treatment by using low-melting-point solid or fluid which can undergo phase change, wherein the low-melting-point solid is polyethylene glycol 200-3000. The fluid capable of phase change is casting solution. The epoxy resin glue layer 2 is a cast epoxy resin glue. The hollow fiber membrane yarn is characterized by further comprising a root reinforcing layer 5 arranged at the root of the hollow fiber membrane yarn, wherein the root reinforcing layer 5 is a polyurethane layer formed by casting polyurethane at the root of the hollow fiber membrane yarn after epoxy resin glue is cast.
A hollow fiber membrane module end-capping treatment method uses epoxy resin as a binder, hollow fiber membrane filaments and an external member are bonded together by centrifugal or static casting, and in order to ensure that epoxy resin cannot permeate the hollow fiber membrane filaments from membrane end holes in the casting bonding process to reduce effective filtering holes of the hollow fiber membrane filaments, the end-capping treatment is carried out on the hollow fiber membrane filaments before casting, specifically:
in order to prevent the end opening of the membrane wire from being unsealed and simultaneously to be capable of being taken out of a die for positioning the hollow fiber membrane wire, low-melting-point solid (such as polyethylene glycol 200-3000 shows a good flowing state at 50-60 ℃) or fluid (such as casting solution) capable of phase change is used for pre-casting before epoxy resin is cast, and a thin isolation layer is pre-cast above the die. The low-melting-point solid is used, solid-liquid phase change can occur at the temperature allowed by the strength of the hollow fiber membrane wire, even if molten fluid enters the inner cavity of the membrane wire to be cooled and solidified to cause the membrane wire to be blocked, after the cast epoxy resin glue is solidified, all the low-melting-point solid in the blocked membrane wire and the isolation layer can be melted by a heating or dissolving method (the low-melting-point solid can be used for multiple times, mainly the liquid is discharged from a discharge port after being heated for next use), and the membrane holes are all opened. When the thin membrane liquid is used for precasting, the membrane liquid in the thin isolation layer can be contacted with water to quickly generate phase inversion membrane forming, and the phenomenon of glue leakage during epoxy resin glue casting is ensured. Casting epoxy resin glue after the isolation layer is obtained to form an epoxy resin glue layer;
after the epoxy resin glue is solidified, the film-shaped isolating layer is removed (the film wire is useless and can be cut or torn off), and the film hole can be completely opened. Meanwhile, before casting, the port of the hollow fiber membrane wire is sealed by using quick-drying glue, then the sealed hollow fiber membrane wire is inserted into a mould in a bundle form or other forms, the two ends of the membrane component are fixed, low-melting-point solid (such as polyethylene glycol 200-3000) or fluid (such as casting solution) capable of phase change is used for pre-casting treatment, and epoxy resin glue is cast after an isolation layer is obtained above the mould. After the epoxy resin is cured, the die is removed, the film hole is opened, the port of the film yarn is modified, and the root of the film yarn is reinforced by utilizing polyurethane (namely, the epoxy resin is cast and then the polyurethane and the two adhesives are cast).
The method for measuring and calculating the effective number ratio of the hollow fiber membrane filaments comprises the following steps:
data for the effective number of membrane modules after the general end-capping process, comparative example 1, comparative example 2, and comparative example 3, and the end-capping process of the present invention, example 4 and example 5, are given below.
Comparative example 1
The comparative example is a conventional membrane wire, sealing treatment is not carried out before casting, epoxy resin is used as a binder, the hollow fiber membrane wire and an external structural member are bonded together through centrifugation or standing casting, cutting is carried out after complete solidification, most of the hollow fiber membrane wire holes at two ends are blocked, and the effective number of the hollow fiber membrane wire accounts for 10-20%.
Comparative example 2
The comparative example is a conventional PVDF hollow fiber membrane filament, the sealing treatment is carried out before casting, epoxy resin is used as a binder, the hollow fiber membrane filament and an external structural member are bonded together through centrifugal or standing casting, cutting is carried out after complete solidification, the hollow fiber membrane filament parts at two ends are blocked, and the effective number of the hollow fiber membrane filament accounts for 70-80%.
Comparative example 3
The comparative example is a conventional PVDF hollow fiber membrane filament, the sealing treatment is carried out before casting, epoxy resin is used as a binder, the hollow fiber membrane filament and an external structural member are bonded together through centrifugal or standing casting, cutting is carried out after the hollow fiber membrane filament is not completely cured, the hole parts of the hollow fiber membrane filaments at two ends are blocked, and the effective number ratio of the hollow fiber membrane filament is 80-90%.
Example 4
The embodiment is a conventional PVDF hollow fiber membrane filament, the sealing treatment is carried out before casting, low-melting-point solid (such as polyethylene glycol 400-2000) is melted and a layer of isolation layer is cast on a mould, then epoxy resin is used as a binder, the hollow fiber membrane filament and an external structural member are centrifuged or statically cast and bonded together, the low-melting-point solid is removed after complete solidification, the mould is taken out, holes of the hollow fiber membrane filaments at two ends can be opened, and the effective number of the hollow fiber membrane filaments accounts for 100%.
Examples example 5
The embodiment is a conventional PVDF hollow fiber membrane filament, and the capping treatment is carried out before casting, firstly a thin isolation layer (phase inversion) is cast on a mould by using a thinner polysulfone membrane liquid, then epoxy resin is used as a binder, the hollow fiber membrane filament and an external structural member are bonded together by centrifugal or standing casting, after complete solidification, the phase inversion membrane is removed, the mould is taken out, the hollow fiber membrane filament holes at two ends can be opened, and the effective number of the hollow fiber membrane filament accounts for 100%.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of protection defined by the claims.
Claims (10)
1. A hollow fiber membrane module end-capping structure, wherein the end-capping structure is completed in a mold, and the end-capping structure comprises an isolation layer provided to the mold before epoxy resin glue is cast.
2. The hollow fiber membrane module end-capping treatment structure according to claim 1, further comprising a capping layer provided at an end of the hollow fiber membrane filament module.
3. The hollow fiber membrane module end-capping treatment structure according to claim 1, wherein the sealing layer is a glue layer, and the glue layer is a glue layer formed of a quick-drying glue.
4. The hollow fiber membrane module-terminating structure according to claim 1, wherein the separation layer is a separation layer formed by performing a pre-casting process using a low-melting solid or a phase-changeable fluid.
5. The end-capping treatment structure of a hollow-fiber membrane module as claimed in claim 4, wherein the low-melting solid is polyethylene glycol 200-3000.
6. The hollow fiber membrane module end-capping treatment structure according to claim 4, wherein the fluid that can undergo phase transition is a casting solution.
7. The hollow fiber membrane module end-capping treatment structure of claim 1, wherein the epoxy glue layer is a cast epoxy glue.
8. The hollow fiber membrane module end-capping treatment structure according to any one of claims 1 to 7, further comprising a root reinforcing layer provided at a root of the hollow fiber membrane filament module.
9. The hollow fiber membrane module end-capping treatment structure according to claim 8, wherein the root reinforcing layer is a polyurethane layer formed by casting polyurethane at the root of the hollow fiber membrane filament module after casting epoxy resin glue.
10. A hollow fiber membrane module end-sealing treatment method is characterized by comprising the following steps:
s1, sealing the port of the hollow fiber membrane wire by using quick-drying glue, inserting the sealed hollow fiber membrane wire into a die and fixing the two ends of the membrane assembly;
s2, performing precast treatment by using low-melting-point solid or fluid capable of generating phase change to obtain an isolation layer above the mold;
s3, casting epoxy resin glue, removing the mould after the epoxy resin is cured, opening the membrane hole, modifying the port of the membrane filament and reinforcing the root of the membrane filament by using polyurethane.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110227505.1A CN112808013A (en) | 2021-03-01 | 2021-03-01 | Hollow fiber membrane module end-sealing treatment structure and treatment method thereof |
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| CN202110227505.1A CN112808013A (en) | 2021-03-01 | 2021-03-01 | Hollow fiber membrane module end-sealing treatment structure and treatment method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113617229A (en) * | 2021-08-26 | 2021-11-09 | 北京碧水源分离膜科技有限公司 | Cast sealing method of hollow fiber membrane module |
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- 2021-03-01 CN CN202110227505.1A patent/CN112808013A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113617229A (en) * | 2021-08-26 | 2021-11-09 | 北京碧水源分离膜科技有限公司 | Cast sealing method of hollow fiber membrane module |
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