Forward osmosis membrane with supporting layer

Abstract

The utility model discloses a forward osmosis membrane with a supporting layer, relates to the technical field of forward osmosis membranes, and aims to solve the problems that an existing forward osmosis membrane is provided with a single supporting layer, and the single supporting layer is insufficient to cope with the impact force of water flow in a torrential water flow environment, so that the forward osmosis membrane has certain limitation; and a single supporting layer cannot meet the supporting requirement. Comprising an inner filtering layer, a plurality of outer filtering layers and a plurality of inner filtering layers, wherein a plurality of inner filtering holes are formed in the outer wall of the inner filtering layer; the first PET composite supporting layer is arranged at the front end of the inner filtering layer; the second PET composite supporting layer is arranged at the rear end of the internal filtering layer; the first PET composite supporting layer and the second PET composite supporting layer are both formed by compositing a first PET supporting layer and a second PET supporting layer, a plurality of first filtering holes and second filtering holes are formed in the outer wall of the first PET supporting layer and the outer wall of the second PET supporting layer, and the first filtering holes and the second filtering holes are arranged in a staggered mode.

Description

Technical Field

[0001] The utility model relates to the technical field of forward osmosis membranes, in particular to a forward osmosis membrane with a supporting layer. Background Art

[0002] Forward osmosis is a natural phenomenon, but it is also a new type of concentration-driven membrane separation technology developed in recent years. It is a membrane separation process that relies on the osmotic pressure difference on both sides of the selective permeable membrane as a driving force to spontaneously realize water transfer. It is one of the hot spots in the field of membrane separation research in the world. Forward osmosis membranes are currently widely used in the field of water filtration.

[0003] For example, the public document: CN215388742U, named "A forward osmosis membrane with anti-pollution function", includes a support layer, a porous layer and an active layer, the support layer is fixedly connected to the porous layer, and the porous layer is fixedly connected to the active layer. In the utility model, the support layer, the porous layer and the active layer are set, and this setting is coordinated with the fixed connection between the support layer and the porous layer and the fixed connection between the porous layer and the active layer. In this way, the anti-pollution function of the forward osmosis membrane can be effectively ensured through the physical properties of the active layer's own material, and its chemical resistance can be greatly increased. At the same time, due to the setting of the pore thickness, not only the strength of the forward osmosis membrane can be greatly increased, but also the permeation flow rate of the forward osmosis membrane can be effectively improved, so that water can flow in smoothly, greatly improving the efficiency of water filtration.

[0004] The above-mentioned existing forward osmosis membrane is a single support layer. In an environment with turbulent water flow, the single support layer is not enough to cope with the impact force of the water flow, resulting in certain limitations. When the number of forward osmosis membrane layers is large, the single support layer cannot meet the support requirements. Therefore, it does not meet the existing needs. We have proposed a forward osmosis membrane with a support layer. Utility Model Content

[0005] The purpose of the utility model is to provide a forward osmosis membrane with a support layer to solve the problem that the existing forward osmosis membrane proposed in the above background technology is a single support layer, and in an environment with turbulent water flow, the single support layer is not enough to cope with the impact force of the water flow, resulting in certain limitations, and when the number of forward osmosis membrane layers is large, the single support layer cannot meet the support requirements.

[0006] To achieve the above object, the utility model provides the following technical solution: a forward osmosis membrane with a support layer, comprising: an internal filter layer, wherein a plurality of internal filter holes are arranged on the outer wall of the internal filter layer;

[0007] Also includes:

[0008] A first PET composite support layer, which is arranged at the front end of the internal filter layer;

[0009] A second PET composite support layer, which is arranged at the rear end of the inner filter layer;

[0010] The first PET composite support layer and the second PET composite support layer are both made of a first PET support layer and a second PET support layer. The outer walls of the first PET support layer and the second PET support layer are both provided with a plurality of first filter holes and second filter holes, and the first filter holes and the second filter holes are arranged alternately.

[0011] Preferably, a first bamboo charcoal fiber layer is arranged at the front end of the first PET composite support layer, and a second bamboo charcoal fiber layer is arranged at the rear end of the second PET composite support layer.

[0012] Preferably, multiple layers of bamboo charcoal fiber nets are arranged on the outer walls of the first bamboo charcoal fiber layer and the second bamboo charcoal fiber layer, and the pore size of the bamboo charcoal fiber nets decreases as they are positioned further back.

[0013] Preferably, a first external filter layer is disposed at the front end of the first bamboo charcoal fiber layer, and a second external filter layer is disposed at the rear end of the second bamboo charcoal fiber layer.

[0014] Preferably, outer filter holes are arranged on the outer walls of the first outer filter layer and the second outer filter layer, and the apertures of the outer filter holes become smaller as they are positioned further back.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The utility model can make the forward osmosis membrane have multiple support layer structures through the arrangement of the first PET composite support layer, the second PET composite support layer, the first PET support layer, the second PET support layer, the first filter hole, and the second filter hole. The multiple support layer structures are distributed at the front and rear ends of the membrane, which can effectively support the inner membrane and the outer membrane; and the support layers are all composite structures, which can improve the strength of the support layers; the above-mentioned support layer materials are all PET materials, which have good heat resistance and aging resistance, are not easy to burn, have strong toughness, and have high impact strength and good folding resistance, which can effectively improve the impact strength of the support layer; the first filter hole and the second filter hole can play a filtering and blocking effect, and the staggered arrangement can increase the filtration area. The higher porosity and larger pore size in the support layer can improve the permeability, thereby leading to a higher flux rate; it solves the problem that the existing forward osmosis membrane is a single support layer, and in a turbulent water flow environment, the single support layer is not enough to cope with the impact force of the water flow, resulting in certain limitations, and when the number of forward osmosis membrane layers is large, the single support layer cannot meet the support requirements.

[0017] 2. The arrangement of the first bamboo charcoal fiber layer, the second bamboo charcoal fiber layer and the bamboo charcoal fiber net can improve the filtering effect at the forward osmosis membrane, and the molecular structure of the bamboo charcoal fiber determines that the fabric will have strong wear resistance and toughness. In addition to good air permeability, the bamboo charcoal fiber also has moisture absorption and quick-drying properties. The bamboo charcoal fiber fabric has certain antibacterial and antibacterial functions, which can effectively improve the antibacterial and anti-pollution effects of the forward osmosis membrane; the multi-layer bamboo charcoal fiber net can further improve the filtering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the partial structure of the first PET composite support layer of the utility model;

[0020] Figure 3 This is a schematic diagram of the internal filter layer structure of the utility model;

[0021] In the figure: 1, first external filter layer; 2, first bamboo charcoal fiber layer; 3, first PET composite support layer; 4, internal filter layer; 5, second PET composite support layer; 6, second bamboo charcoal fiber layer; 7, second external filter layer; 8, first PET support layer; 9, second PET support layer; 10, first filter hole; 11, second filter hole; 12, internal filter hole; 13, external filter hole; 14, bamboo charcoal fiber net. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] See also Figure 1-3 , the utility model provides an embodiment: a forward osmosis membrane with a support layer, comprising: an internal filter layer 4, a plurality of internal filter holes 12 are arranged on the outer wall of the internal filter layer 4;

[0024] Also includes:

[0025] A first PET composite support layer 3, which is arranged at the front end of the internal filter layer 4;

[0026] A second PET composite support layer 5, which is arranged at the rear end of the internal filter layer 4;

[0027] The first PET composite support layer 3 and the second PET composite support layer 5 are both made of a first PET support layer 8 and a second PET support layer 9. The outer walls of the first PET support layer 8 and the second PET support layer 9 are both provided with a plurality of first filter holes 10 and second filter holes 11, and the first filter holes 10 and the second filter holes 11 are arranged alternately.

[0028] By arranging the first PET composite support layer 3, the second PET composite support layer 5, the first PET support layer 8, the second PET support layer 9, the first filter hole 10, and the second filter hole 11, the forward osmosis membrane can have multiple support layer structures, and the multiple support layer structures are distributed at the front and rear ends of the membrane, which can effectively support the inner membrane and the outer membrane; and the support layers are all composite structures, which can improve the strength of the support layers; the above-mentioned support layers are all made of PET material, which has good heat resistance and aging resistance, is not easy to burn, has strong toughness, and has high impact strength and good folding resistance, which can effectively improve the impact strength of the support layer; the first filter hole 10 and the second filter hole 11 can play a filtering and blocking effect, and the staggered arrangement can increase the filtration area. The higher porosity and larger pore size in the support layer can improve the permeability, thereby leading to a higher flux rate.

[0029] See also Figure 1 , Figure 2 The front end of the first PET composite support layer 3 is provided with a first bamboo charcoal fiber layer 2, and the rear end of the second PET composite support layer 5 is provided with a second bamboo charcoal fiber layer 6; the outer walls of the first bamboo charcoal fiber layer 2 and the second bamboo charcoal fiber layer 6 are both provided with multiple layers of bamboo charcoal fiber nets 14, and the pore size of the bamboo charcoal fiber nets 14 is smaller as it is closer to the back;

[0030] The arrangement of the first bamboo charcoal fiber layer 2, the second bamboo charcoal fiber layer 6, and the bamboo charcoal fiber net 14 can improve the filtering effect at the forward osmosis membrane, and the molecular structure of the bamboo charcoal fiber determines that the fabric will have strong wear resistance and toughness. In addition to good air permeability, the bamboo charcoal fiber also has the properties of moisture absorption and quick drying. The bamboo charcoal fiber fabric has certain antibacterial and antibacterial functions, which can effectively improve the antibacterial and anti-pollution effects of the forward osmosis membrane; the multi-layer bamboo charcoal fiber net 14 can further improve the filtering effect.

[0031] See also Figure 1 The front end of the first bamboo charcoal fiber layer 2 is provided with a first external filter layer 1, and the rear end of the second bamboo charcoal fiber layer 6 is provided with a second external filter layer 7; the outer walls of the first external filter layer 1 and the second external filter layer 7 are both provided with external filter holes 13, and the aperture of the external filter holes 13 becomes smaller as it moves toward the back;

[0032] The first external filter layer 1, the second external filter layer 7, and the external filter hole 13 have the effect of external filtration. The first external filter layer 1, the second external filter layer 7 and the internal filter layer 4 are all cellulose acetate membranes. The setting of internal and external filtration can effectively improve the filtration effect of the forward osmosis membrane.

[0033] Working principle: through the arrangement of the first PET composite support layer 3, the second PET composite support layer 5, the first PET support layer 8, the second PET support layer 9, the first filter hole 10, and the second filter hole 11, the forward osmosis membrane can have multiple support layer structures, and the multiple support layer structures are distributed at the front and rear ends of the membrane, which can effectively support the inner membrane and the outer membrane; and the support layers are all composite structures, which can improve the strength of the support layers; the above-mentioned support layers are all made of PET material, which has good heat resistance and aging resistance, is not easy to burn, has strong toughness, and has high impact strength and good folding resistance, which can effectively improve the impact strength of the support layer; the first filter hole 10 and the second filter hole 11 can play a filtering and blocking effect, and the staggered arrangement can increase the filtration area. The higher porosity and larger pore size in the support layer can improve the permeability, thereby leading to a higher flux rate;

[0034] The arrangement of the first bamboo charcoal fiber layer 2, the second bamboo charcoal fiber layer 6, and the bamboo charcoal fiber net 14 can improve the filtering effect at the forward osmosis membrane, and the molecular structure of the bamboo charcoal fiber determines that the fabric has strong wear resistance and toughness. In addition to good air permeability, the bamboo charcoal fiber also has the performance of moisture absorption and quick drying. The bamboo charcoal fiber fabric has certain antibacterial and antibacterial functions, which can effectively improve the antibacterial and anti-pollution effects of the forward osmosis membrane; the multi-layer bamboo charcoal fiber net 14 can further improve the filtering effect;

[0035] The first external filter layer 1, the second external filter layer 7, and the external filter hole 13 have the effect of external filtration. The first external filter layer 1, the second external filter layer 7 and the internal filter layer 4 are all cellulose acetate membranes. The setting of internal and external filtration can effectively improve the filtration effect of the forward osmosis membrane.

[0036] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A forward osmosis membrane with a support layer, comprising an internal filter layer (4), wherein a plurality of internal filter holes (12) are arranged on the outer wall of the internal filter layer (4); Features: Also includes: A first PET composite support layer (3), which is arranged at the front end of the internal filter layer (4); A second PET composite support layer (5), which is arranged at the rear end of the inner filter layer (4); The first PET composite support layer (3) and the second PET composite support layer (5) are both made by compositely forming a first PET support layer (8) and a second PET support layer (9); a plurality of first filter holes (10) and second filter holes (11) are arranged on the outer walls of the first PET support layer (8) and the second PET support layer (9); and the first filter holes (10) and the second filter holes (11) are arranged in a staggered manner.

2. A forward osmosis membrane with a support layer according to claim 1, characterized in that: A first bamboo charcoal fiber layer (2) is arranged at the front end of the first PET composite support layer (3), and a second bamboo charcoal fiber layer (6) is arranged at the rear end of the second PET composite support layer (5).

3. A forward osmosis membrane with a support layer according to claim 2, characterized in that: Multiple layers of bamboo charcoal fiber nets (14) are arranged on the outer walls of the first bamboo charcoal fiber layer (2) and the second bamboo charcoal fiber layer (6), and the pore diameters of the bamboo charcoal fiber nets (14) decrease as they are positioned further back.

4. A forward osmosis membrane with a support layer according to claim 2, characterized in that: A first external filter layer (1) is provided at the front end of the first bamboo charcoal fiber layer (2), and a second external filter layer (7) is provided at the rear end of the second bamboo charcoal fiber layer (6).

5. A forward osmosis membrane with a support layer according to claim 4, characterized in that: External filter holes (13) are provided on the outer walls of the first external filter layer (1) and the second external filter layer (7), and the apertures of the external filter holes (13) decrease as they are positioned further back.

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