阅读说明：本技术 中空纤维膜组件的铸封方法 (Cast sealing method of hollow fiber membrane module ) 是由 卢彦斌 吴赳 陈亦力 张雪芳 曹敬灿 王睿涵 石周 于 2021-08-26 设计创作，主要内容包括：本发明涉及中空纤维膜组件制备技术领域,尤其是涉及一种中空纤维膜组件的铸封方法。中空纤维膜组件的铸封方法,包括如下步骤：(a)中空纤维膜集束保持一端浸入填充液体中的状态,在填充液体的液面上方注入灌封树脂并充分填充于所述中空纤维膜集束的膜丝之间；(b)待所述灌封树脂固化后,回收所述填充液体；其中,所述填充液体的密度大于所述灌封树脂的密度；所述填充液体的室温粘度为1～3000mPa·s。本发明通过采用高密度、低粘度的液体,利用灌封树脂与填充液体之间的密度差,使灌封树脂注入填充液体上时,能够保持在填充液体的液面上而不下沉；同时由于填充液体的粘度低,流动性好易于回收并重复利用,能够降低生产成本。(The invention relates to the technical field of hollow fiber membrane component preparation, in particular to a cast-sealing method of a hollow fiber membrane component. The cast-sealing method of the hollow fiber membrane module comprises the following steps: (a) the hollow fiber membrane bundle keeps a state that one end is immersed in filling liquid, and pouring potting resin above the liquid level of the filling liquid and fully filling the potting resin between membrane filaments of the hollow fiber membrane bundle; (b) after the potting resin is cured, recovering the filling liquid; wherein the filling liquid has a density greater than that of the potting resin; the viscosity of the filling liquid at room temperature is 1-3000 mPa. The invention adopts the liquid with high density and low viscosity, and utilizes the density difference between the potting resin and the filling liquid to ensure that the potting resin can be kept on the liquid surface of the filling liquid without sinking when being injected into the filling liquid; meanwhile, the filling liquid has low viscosity and good fluidity, is easy to recover and recycle, and can reduce the production cost.)

1. The cast-sealing method of the hollow fiber membrane module is characterized by comprising the following steps:

(a) the hollow fiber membrane bundle keeps a state that one end is immersed in filling liquid, and pouring potting resin above the liquid level of the filling liquid and fully filling the potting resin between membrane filaments of the hollow fiber membrane bundle;

(b) after the potting resin is cured, recovering the filling liquid;

wherein the filling liquid has a density greater than that of the potting resin; the viscosity of the filling liquid at room temperature is 1-3000 mPa.

2. The method for potting a hollow fiber membrane module according to claim 1, wherein the density difference between the filling liquid and the potting resin is not less than 0.02g/cm³；

Preferably, the density difference between the filling liquid and the potting resin is 0.05-1 g/cm³。

3. The method for potting a hollow fiber membrane module according to claim 1, wherein the filling liquid has a room temperature viscosity of 1 to 200 mPa-s.

4. The method of potting a hollow fiber membrane module according to claim 1, wherein the filling liquid comprises at least one of glycerin, glycerol carbonate, an inorganic salt solution, an organic salt solution, a polyol solution, and an organic acid solution;

preferably, the inorganic salt solution is an aqueous solution of an inorganic salt;

more preferably, the inorganic salt is selected from any one of calcium chloride, magnesium bromide, potassium carbonate and sodium dihydrogen phosphate;

preferably, the organic salt solution is an aqueous solution of an organic salt;

more preferably, the organic salt is selected from at least one of potassium formate, sodium citrate and potassium tartrate;

preferably, the polyol solution is an aqueous solution of a polyol;

more preferably, the polyol is selected from at least one of xylitol and sorbitol;

preferably, the organic acid solution is an aqueous solution of an organic acid;

more preferably, the organic acid is citric acid.

5. The method of potting a hollow fiber membrane module according to claim 1, wherein the potting resin comprises at least one of a polyurethane-based resin and an epoxy-based resin.

6. The method for potting a hollow fiber membrane module according to claim 1, wherein the hollow fiber membrane bundle is immersed in the filling liquid at a height of 3 to 40 mm;

preferably, the immersion height is 10-25 mm.

7. The method of potting a hollow fiber membrane module according to any one of claims 1 to 6, wherein the filling liquid is placed in a water collecting channel;

preferably, the hollow fiber membrane bundle is kept in a state where one end is immersed in a filling liquid filled in the water collecting passage;

preferably, one end of the bundle of hollow fiber membranes is immersed in the filling liquid centrally with respect to the water collecting passage.

8. The method for potting a hollow fiber membrane module according to claim 7, wherein a water-producing port is provided at a bottom of the water collecting channel;

and/or a buffer unit is arranged above the liquid level of the filling liquid in the water collecting channel;

preferably, the buffer unit includes any one of a buffer plate, an overflow orifice plate, and an overflow bowl.

9. The method for potting a hollow fiber membrane module according to claim 7, wherein the potting height of the potting resin is 15 to 65 mm;

preferably, the potting resin is filled between the membrane filaments of the hollow fiber membrane bundle, between the hollow fiber membrane bundle and the side wall of the water collecting channel in a potting height range.

10. The cast-sealing method of a hollow fiber membrane module as claimed in claim 1, wherein the hollow fiber membrane bundle comprises at least two hollow fiber membrane units composed of sheet-like or bundle-like hollow fiber membrane filaments;

preferably, the hollow fiber membrane units of the hollow fiber membrane bundle are aligned and fixed.

Technical Field

The invention relates to the technical field of hollow fiber membrane component preparation, in particular to a cast-sealing method of a hollow fiber membrane component.

Background

Membrane separation is a new technology of separation that emerged at the beginning of the 20 th century and grew rapidly after the 60's of the 20 th century. In order to filter liquid by using the hollow fiber membrane, the hollow fiber membrane is fixed on a header, a sealed cavity is formed at the root of the hollow fiber membrane, the root of the membrane wire is isolated from the outside, and the end part of the membrane wire is kept in an open state with the inner cavity of the header, so that when suction or pressure is applied to the inner cavity of the header, the liquid can permeate through the surface of the membrane and then is collected into the header, and the liquid purification effect is achieved.

In order to realize the above cast sealing in the prior art, the following methods are mainly adopted:

(1) preparing a hollow fiber membrane into a fabric with an unopened end part, then placing the fabric into liquid potting resin for curing and sealing, and after curing is finished, cutting and opening the end part of a membrane wire; then connected to the header; alternatively, the first and second electrodes may be,

(2) forming a temporary layer at the tail end of the hollow fiber membrane by using paraffin, injecting potting resin to the upper part of the paraffin after the paraffin is solidified to form a sealing layer, and heating and melting the paraffin or removing the paraffin by using a solvent after the solidification is finished so as to keep an open state between the end surface of the membrane wire and the water collecting pipe; alternatively, the first and second electrodes may be,

(3) sealing the ends of the membrane filaments of the hollow fiber membrane in the dense gel, then injecting potting resin into the upper end of the gel and the gaps of the membrane filaments to form sealing, and after the curing technology, discharging the gel by adopting means of vibration, solvent washing or heating and the like.

However, in the prior art, the artificial dependence is strong, the process operation is complex, and the manufacturing process comprises the following steps: cutting residues generate hazardous wastes, so that the subsequent treatment cost is increased; the recovery of paraffin or gel is difficult, and if the treatment is not clean, the residue has the risk of blocking the membrane wire hole, and the like.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

The invention aims to provide a method for casting and sealing a hollow fiber membrane component, which aims to solve the technical problems of complex operation, generation of hazardous wastes, high cost and the like in the prior art.

In order to achieve the above purpose of the present invention, the following technical solutions are adopted:

the cast-sealing method of the hollow fiber membrane module comprises the following steps:

(a) the hollow fiber membrane bundle keeps a state that one end is immersed in filling liquid, and pouring potting resin above the liquid level of the filling liquid and fully filling the potting resin between membrane filaments of the hollow fiber membrane bundle;

(b) after the potting resin is cured, recovering the filling liquid;

wherein the filling liquid has a density greater than that of the potting resin; the viscosity of the filling liquid at room temperature is 1-3000 mPa.

The invention adopts the liquid with high density and low viscosity, and utilizes the density difference between the potting resin and the filling liquid to ensure that the potting resin can be kept on the liquid surface of the filling liquid without sinking when being injected into the filling liquid; meanwhile, the filling liquid has low viscosity and good fluidity, is easy to recover and recycle, and can reduce the production cost.

In a specific embodiment of the present invention, the density difference between the filling liquid and the potting resin is not less than 0.02g/cm³. Further, the density difference is preferably 0.05-1 g/cm³。

In a specific embodiment of the present invention, the filling liquid has a room temperature viscosity of 1 to 200mPa · s.

In a specific embodiment of the present invention, the filling liquid is inert with respect to the potting resin and the hollow fiber membrane.

In a specific embodiment of the present invention, the filling liquid comprises at least one of glycerol, glycerol carbonate, an inorganic salt solution, an organic salt solution, a polyol solution, and an organic acid solution.

In a specific embodiment of the present invention, the potting resin includes at least one of a polyurethane-based resin and an epoxy-based resin.

In practice, a conventional, fast-curing polyurethane-based resin or epoxy-based resin may be used to improve the production efficiency.

In a specific embodiment of the present invention, the immersion height of the hollow fiber membrane bundle in the filling liquid is 3 to 40mm, preferably 10 to 25 mm.

In a specific embodiment of the present invention, the potting resin is injected in 1 to 3 times. So as to avoid the hole blocking phenomenon caused by the impact caused by the one-time injection of the potting resin or the sinking caused by the gravity of the potting resin.

In a particular embodiment of the invention, the filling liquid is placed in the water collecting channel. Further, the hollow fiber membrane bundle is kept in a state where one end is immersed in the filling liquid filled in the water collecting passage. Preferably, one end of the bundle of hollow fiber membranes is immersed in the filling liquid centrally with respect to the water collecting passage.

When one end of the hollow fiber membrane cluster is immersed in the filling liquid, the hollow fiber membrane cluster is placed in the center relative to the water collecting channel as much as possible, and the appearance attractiveness of the product can be further ensured. In practical operation, the hollow fiber membrane bundle can be immersed into the filling liquid in a centralized manner manually or by a tool, and is fixed in the filling resin injection and curing stages, such as by a manipulator.

In a specific embodiment of the invention, a water producing port is arranged at the bottom of the water collecting channel.

In a particular embodiment of the invention, a buffer unit is arranged above the level of the filling liquid in the water collection channel. Further, the buffer unit includes any one of a buffer plate, an overflow orifice plate, and an overflow bowl.

The buffer unit can reduce the impact of the injection of the potting resin on the filling liquid and avoid the sinking of the potting resin in the injection process.

In a specific embodiment of the present invention, the potting height of the potting resin is 15 to 65 mm.

In a specific embodiment of the present invention, the potting resin is filled between the membrane filaments of the hollow fiber membrane bundle, between the hollow fiber membrane bundle and the side wall of the water collecting channel, within a potting height range.

In a specific embodiment of the present invention, the hollow fiber membrane bundle includes at least two hollow fiber membrane units composed of sheet-like or bundle-like hollow fiber membrane filaments.

In practice, the hollow fiber membrane filaments constituting the hollow fiber membrane unit may be arranged in order or in a random bundle.

In a specific embodiment of the invention, the hollow fiber membrane units of the hollow fiber membrane bundle are aligned and fixed. In practice, the fixing may be performed by means of an adhesive, a string, a nail, or the like, or by means of pressure fixing such as a jig.

In a specific embodiment of the present invention, the hollow fiber membrane unit comprises a hollow fiber membrane sheet. Furthermore, one or two elastic bodies are arranged on the hollow fiber membrane sheet material along the direction perpendicular to the hollow fiber membrane silk.

In a specific embodiment of the present invention, the hollow fiber membrane bundle includes 2 to 30 hollow fiber membrane sheets. The hollow fiber membrane bundle is a laminated body of the hollow fiber membrane sheets.

In a specific embodiment of the present invention, the method further comprises: and detecting the density of the filling liquid obtained by recovering. To ensure that the sealing difference between the filling liquid and the potting resin is within the required range.

Compared with the prior art, the invention has the beneficial effects that:

(1) the invention adopts the liquid with high density and low viscosity, and utilizes the density difference between the potting resin and the filling liquid to ensure that the potting resin can be kept on the liquid surface of the filling liquid without sinking when being injected into the filling liquid; meanwhile, the filling liquid has low viscosity and good fluidity, is easy to recover and recycle, and can reduce the production cost;

(2) in the casting and sealing process, the one-time glue injection operation can be finished without cutting, so that the investment of manual equipment is saved, the resource waste is reduced, and the generation of hazardous waste is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a hollow fiber membrane unit provided in an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a hollow fiber membrane bundle provided in an embodiment of the present invention;

fig. 3 is a schematic view of one end of a hollow fiber membrane bundle fixedly immersed in a filling liquid in a water collecting channel according to an embodiment of the present invention.

Reference numerals:

1-hollow fiber membrane filaments; 2-a first elastomer; 3-a second elastomer;

11-a hollow fiber membrane unit; 12-hollow fiber membrane bundling; 13-a water collecting channel;

14-a fill liquid; 15-potting resin injection; 16-potting resin layer.

Detailed Description

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and the detailed description, but those skilled in the art will understand that the following described embodiments are some, not all, of the embodiments of the present invention, and are only used for illustrating the present invention, and should not be construed as limiting the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

The cast-sealing method of the hollow fiber membrane module comprises the following steps:

(a) the hollow fiber membrane bundle keeps a state that one end is immersed in filling liquid, and pouring potting resin above the liquid level of the filling liquid and fully filling the potting resin between membrane filaments of the hollow fiber membrane bundle;

(b) after the potting resin is cured, recovering the filling liquid;

wherein the filling liquid has a density greater than that of the potting resin; the viscosity of the filling liquid at room temperature is 1-3000 mPa.

The invention adopts the liquid with high density and low viscosity, and utilizes the density difference between the potting resin and the filling liquid to ensure that the potting resin can be kept on the liquid surface of the filling liquid without sinking when being injected into the filling liquid; meanwhile, the filling liquid has low viscosity and good fluidity, is easy to recover and recycle, and can reduce the production cost.

In a specific embodiment of the present invention, the density difference between the filling liquid and the potting resin is not less than 0.02g/cm³. Further, the density difference is preferably 0.05-1 g/cm³。

As in various embodiments, the difference in density of the fill liquid and the potting resin may be 0.05g/cm³、0.1g/cm³、0.15g/cm³、0.2g/cm³、0.25g/cm³、0.3g/cm³、0.35g/cm³、0.4g/cm³、0.45g/cm³、0.5g/cm³、0.55g/cm³、0.6g/cm³、0.65g/cm³、0.7g/cm³、0.75g/cm³、0.8g/cm³、0.85g/cm³、0.9g/cm³、0.95g/cm³、1g/cm³And so on.

In a specific embodiment of the present invention, the filling liquid has a room temperature viscosity of 1 to 200mPa · s.

As in the different embodiments, the viscosity of the filling liquid may be 1 mPas, 5 mPas, 10 mPas, 20 mPas, 30 mPas, 40 mPas, 50 mPas, 60 mPas, 70 mPas, 80 mPas, 90 mPas, 100 mPas, 110 mPas, 120 mPas, 130 mPas, 140 mPas, 150 mPas, 160 mPas, 170 mPas, 180 mPas, 190 mPas, 200 mPas, or the like.

In a specific embodiment of the present invention, the filling liquid is inert with respect to the potting resin and the hollow fiber membrane. The resin is not chemically reacted with the potting resin and the membrane wires, is not mutually soluble with the potting resin and the membrane wires, and does not influence the bonding performance of the potting resin, the membrane wires and the water collecting channel.

In a specific embodiment of the present invention, the filling liquid may be a single liquid substance or a compound solution; the compound solution can be inorganic solution, organic solution, or a compound solution of inorganic substance and organic substance, and meets the requirements on density, viscosity, inertia and the like.

In a specific embodiment of the present invention, the filling liquid comprises at least one of glycerin, glycerol carbonate, an inorganic salt solution, an organic salt solution, a highly soluble polyhydric alcohol solution, and a highly soluble organic acid solution.

In a specific embodiment of the present invention, the inorganic salt solution is an aqueous solution of an inorganic salt. Further, the inorganic salt is selected from any one of calcium chloride, magnesium bromide, potassium carbonate and sodium dihydrogen phosphate.

In a specific embodiment of the invention, the organic salt solution is an aqueous solution of an organic salt. Further, the organic salt is at least one selected from potassium formate, sodium citrate and potassium tartrate.

In a specific embodiment of the invention, the polyol solution is an aqueous solution of a polyol. Further, the polyhydric alcohol is selected from at least one of xylitol and sorbitol.

In a specific embodiment of the present invention, the organic acid solution is an aqueous solution of an organic acid. Further, the organic acid is citric acid.

In a specific embodiment of the present invention, the potting resin includes at least one of a polyurethane-based resin and an epoxy-based resin.

In practice, a conventional, fast-curing polyurethane-based resin or epoxy-based resin may be used to improve the production efficiency.

In a specific embodiment of the present invention, the immersion height of the hollow fiber membrane bundle in the filling liquid is 3 to 40mm, preferably 10 to 25 mm.

As in the different embodiments, the immersion height may be 10mm, 15mm, 20mm, 25mm, etc. In the above immersion height range, the problem of hole blockage due to sinking in the injection process of the potting resin is more favorably avoided, and the utilization rate of the hollow fiber membrane filaments is improved.

In a specific embodiment of the present invention, the potting resin is injected in 1 to 3 times. So as to avoid the hole blocking phenomenon caused by the impact caused by the one-time injection of the potting resin or the sinking caused by the gravity of the potting resin.

In a particular embodiment of the invention, the filling liquid is placed in the water collecting channel. Further, the hollow fiber membrane bundle is kept in a state where one end is immersed in the filling liquid filled in the water collecting passage. Preferably, one end of the bundle of hollow fiber membranes is immersed in the filling liquid centrally with respect to the water collecting passage.

When one end of the hollow fiber membrane cluster is immersed in the filling liquid, the hollow fiber membrane cluster is placed in the center relative to the water collecting channel as much as possible, and the appearance attractiveness of the product can be further ensured. In practical operation, the hollow fiber membrane bundle can be immersed into the filling liquid in a centralized manner manually or by a tool, and is fixed in the filling resin injection and curing stages, such as by a manipulator.

In a specific embodiment of the invention, a water producing port is arranged at the bottom of the water collecting channel.

In a particular embodiment of the invention, a buffer unit is arranged above the level of the filling liquid in the water collection channel. Further, the buffer unit includes any one of a buffer plate, an overflow orifice plate, and an overflow bowl.

The buffer unit can reduce the impact of the injection of the potting resin on the filling liquid and avoid the sinking of the potting resin in the injection process.

In a specific embodiment of the present invention, the potting height of the potting resin is 15 to 65 mm.

In a specific embodiment of the present invention, the potting resin is filled between the membrane filaments of the hollow fiber membrane bundle, between the hollow fiber membrane bundle and the side wall of the water collecting channel, within a potting height range. And then forming a potting resin layer with a certain height, fixing the hollow fiber membrane cluster in the water collecting channel, forming a sealed cavity at the root of the hollow fiber membrane cluster, isolating the root of the membrane wire from the outside, and keeping the end of the membrane wire and the inner cavity of the water collecting channel in an open state.

In a specific embodiment of the present invention, the hollow fiber membrane bundle includes at least two hollow fiber membrane units composed of sheet-like or bundle-like hollow fiber membrane filaments.

The structure of the hollow fiber membrane bundle is not limited to this, and is adjusted according to the form of the hollow fiber membrane module to be cast-sealed in actual production.

In practice, the hollow fiber membrane filaments constituting the hollow fiber membrane unit may be arranged in order or in a random bundle.

In a specific embodiment of the present invention, the hollow fiber membrane filaments have a water content of 10% to 30%, such as 10%, 15%, 20%, 25%, 30%, and the like.

In a specific embodiment of the invention, the hollow fiber membrane units of the hollow fiber membrane bundle are aligned and fixed. In practice, the fixing may be performed by means of an adhesive, a string, a nail, or the like, or by means of pressure fixing such as a jig.

In a specific embodiment of the present invention, the hollow fiber membrane unit comprises a hollow fiber membrane sheet. Furthermore, one or two elastic bodies are arranged on the hollow fiber membrane sheet material along the direction perpendicular to the hollow fiber membrane silk.

In a specific embodiment of the present invention, the hollow fiber membrane bundle includes 2 to 30 hollow fiber membrane sheets. The hollow fiber membrane bundle is a laminated body of the hollow fiber membrane sheets.

In a specific embodiment of the present invention, the method further comprises: and detecting the density of the filling liquid obtained by recovering. To ensure that the sealing difference between the filling liquid and the potting resin is within the required range.

Fig. 1 is a schematic structural diagram of a hollow fiber membrane unit according to an embodiment of the present invention; fig. 2 is a schematic structural diagram of a hollow fiber membrane bundle according to an embodiment of the present invention. As can be seen from fig. 1 and 2, the hollow fiber membrane unit 11 is a hollow fiber membrane sheet, and includes a plurality of hollow fiber membrane filaments 1 arranged side by side in the transverse direction.

Further, the hollow fiber membrane sheet is provided with one or two elastic bodies along a direction perpendicular to the hollow fiber membrane filaments, for example, a first elastic body 2 and a second elastic body 3, so that the hollow fiber membrane filaments 1 constituting the hollow fiber membrane unit 11 are stably attached to each other.

The hollow fiber membrane bundle 12 includes 2 to 30 hollow fiber membrane sheets, and the hollow fiber membrane bundle 12 is a laminated body of the hollow fiber membrane sheets 11. In practical operation, the hollow fiber membrane sheets 11 of the hollow fiber membrane bundle 12 may be aligned and bonded by an adhesive, may be fixed by a string or a nail, or may be fixed by a clamp pressure.

Fig. 3 is a schematic view of one end of a hollow fiber membrane bundle 12 fixedly immersed in a filling liquid in a water collecting channel according to an embodiment of the present invention. As can be seen from fig. 3, the potting method of the hollow fiber membrane module includes the following steps:

(a) the hollow fiber membrane bundle 12 is kept in a state that one end is immersed in filling liquid 14, and filling resin is injected at a filling resin injection part 15 above the liquid level of the filling liquid 14 and is fully filled between the membrane wires 11 of the hollow fiber membrane bundle 12;

(b) after the potting resin is cured, forming a potting resin layer 16, and recovering the filling liquid 14;

wherein the filling liquid has a density greater than that of the potting resin; the viscosity of the filling liquid at room temperature is 1-3000 mPa.

Further, the filling liquid 14 is disposed in the water collecting channel 13. Further, the hollow fiber membrane bundle 12 is kept in a state where one end is immersed in the filling liquid 14 filled in the water collecting channel 13. Preferably, one end of the bundle 12 of hollow fiber membranes is immersed in the filling liquid 14 centrally with respect to the water collecting channel 13.

Further, the method for potting the hollow fiber membrane module comprises the following steps:

(a) filling liquid 14 is placed in a water collecting channel 13, a hollow fiber membrane bundle 12 is kept in a state that one end is immersed in the filling liquid 14 filled in the water collecting channel 13, potting resin is injected at a potting resin injection part 15 above the liquid level of the filling liquid 14 and is fully filled between membrane wires 11 of the hollow fiber membrane bundle 12 and between the hollow fiber membrane bundle 12 and the side wall of the water collecting channel 13;

(b) after the potting resin is cured, a potting resin layer 16 is formed, and the filling liquid 14 is recovered.

Further, a water producing port is arranged at the bottom of the water collecting channel.

Further, a buffer unit (not shown) is provided above the liquid surface of the filling liquid 14 in the water collecting channel 13. Further, the buffer unit includes any one of a buffer plate, an overflow orifice plate, and an overflow bowl. The buffer unit can reduce the impact of the injection of the potting resin on the filling liquid and avoid the sinking of the potting resin in the injection process.

Further, the filling liquid 14 is inert with respect to the potting resin, the hollow fiber membranes, and the water collecting channel 13.

Example 1

The present embodiment provides a method for potting a hollow fiber membrane module, which is schematically shown in fig. 3, and includes the following steps: (1) aligning and fixing the hollow fiber membrane units to form a hollow fiber membrane bundle in the manner of the above-mentioned figures 1 and 2;

(2) adding filling liquid with the thickness of 30-60 mm into the water collecting channel; vertically (along the axial direction of membrane wires) placing the hollow fiber membrane bundle obtained in the step (1) into a water collecting channel, and immersing the end part of the membrane wire at one end of the hollow fiber membrane bundle into filling liquid, wherein the immersion height is 10-25 mm;

(3) injecting potting resin above the liquid level of the filling liquid to the upper part of the filling liquid level, injecting for 2 times to ensure that the potting resin is fully filled among membrane filaments of the hollow fiber membrane cluster, between the hollow fiber membrane cluster and the side wall of the water collecting channel within the range of the potting height, and waiting for proper time after the injection is finished to ensure that the potting resin is cured to form a potting resin layer with the potting height of 15-65 mm;

(4) opening a water producing port at the bottom of the water collecting channel, and recovering the filling liquid from the water producing port to finish the cast sealing of the hollow fiber membrane cluster; and detecting the density of the recovered filling liquid to ensure that the density difference between the filling liquid and the potting resin is within a required range.

Wherein the filling liquid is glycerol and has a density of 1.26g/cm³The viscosity at room temperature is 1300 mPas, and the encapsulating resin is polyurethane encapsulating resin.

When the hollow fiber membrane module was cast using glycerin as the filling liquid in the above manner, the adhesion strength of the membrane filaments after cast was measured at different injection heights (encapsulation heights of the potting resin layer) and at different water contents of the membrane filaments, as shown in table 1 below.

TABLE 1 Membrane filament bond strength in various cases using glycerol as the filling liquid

Example 2

This example refers to the potting method of example 1, except that the filling liquid is different. The filling liquid adopted in the embodiment is 65% of potassium formate aqueous solution by mass, and the filling liquid density is 1.47g/cm³Viscosity of 30 mPas at room temperature, and pouringThe sealing resin used was a polyurethane potting resin (same as in example 1).

When the hollow fiber membrane module was cast using the potassium formate aqueous solution as the filling liquid in the above manner, the adhesion strength of the membrane filaments after cast-sealing was measured at different injection heights (encapsulation heights of the potting resin layer) and at different membrane filament water contents, as shown in table 2 below.

TABLE 2 Membrane thread bond strength in various cases using aqueous potassium formate as the filling liquid

Example 3

This example refers to the potting method of example 1, except that the filling liquid is different. The filling liquid adopted in the embodiment is a calcium chloride aqueous solution with the mass fraction of 42%, and the density of the filling liquid is 1.368g/cm³The viscosity at room temperature is 20mPa & s, the encapsulating resin is polyurethane encapsulating resin, and the adhesive strength is more than 100N under the conditions that the injecting height is 35mm and the water content of the membrane filaments is 10 percent.

Example 4

This example refers to the potting method of example 1, except that the filling liquid is different. The filling liquid adopted in the embodiment is glycerol carbonate liquid, and the density of the filling liquid is 1.4g/cm³The viscosity at room temperature is 20mPa & s, the encapsulating resin is polyurethane encapsulating resin, and the bonding strength of the film yarn with the injecting height of 45mm under the condition of 10% water content is 45N.

According to the cast-sealing method of the hollow fiber membrane component, the density difference between the potting resin and the filling liquid is adopted for cast-sealing, and meanwhile, the filling liquid is good in fluidity, low in viscosity, easy to recover, free of hazardous waste and environment-friendly; and the filling liquid has no corrosiveness and the like, and the bonding strength between the potting resin and the membrane wires and between the potting resin and the water collecting channels is not influenced. In the casting and sealing process, the invention can realize one-time glue injection operation without cutting, thereby saving the investment of manual equipment, reducing the resource waste and the like.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.