Method for preparing glass fiber layer of reverse osmosis membrane element

Abstract

The invention relates to the technical field of reverse osmosis, and discloses a method for preparing a glass fiber layer of a reverse osmosis membrane element. The method is carried out in a winding device for a reverse osmosis membrane element, and comprises the following steps: infiltrating glass fiber gridding cloth in a sealant to obtain glass fiber gridding cloth I, and winding the glass fiber gridding cloth I to enable the glass fiber gridding cloth I to be wound on the surface of the reverse osmosis membrane element; the mesh size of the glass fiber gridding cloth is not larger than 100 mm < 2 >, the gram weight is not larger than 500 g / m < 2 >, and the mesh diameter is not larger than 3 mm; the winding treatment conditions at least comprise that the number of winding turns is 4-7, the winding speed is 5-20 rpm, and the temperature is 10-30 DEG C. The glass fiber gridding cloth with specific parameter types is continuously wound on the outer layer of the reverse osmosis membrane element after being soaked in the large-width glue tank, and the method has the advantages of being easy to operate, short in processing period, high in efficiency and controllable in quality.

Description

Technical Field

[0001] The invention relates to the technical field of reverse osmosis, and in particular to a method for preparing a glass fiber layer of a reverse osmosis membrane element. Background Art

[0002] Reverse osmosis membranes are widely used in pure water preparation, sewage treatment, seawater desalination, material separation and concentration due to their advantages of low energy consumption, no phase change and small size.

[0003] Reverse osmosis membrane elements are the core components of reverse osmosis systems. Most commercial reverse osmosis membrane elements are spiral wound structures, which are made of reverse osmosis membrane sheets, pure water guide nets, and raw water guide nets wound around water collection pipes. The pore size of reverse osmosis membrane elements is as small as nanometers. Under a certain pressure, water molecules can pass through the RO membrane, while inorganic salts, heavy metal ions, organic matter, colloids, bacteria, viruses and other impurities in the raw water cannot pass through the RO membrane, thereby strictly distinguishing between pure water that can pass through and concentrated water that cannot pass through.

[0004] The reverse osmosis membrane element needs to be placed in a membrane shell for use, and needs to withstand a large pressure during use, so the element needs to have a large impact resistance and a uniform outer diameter. In the prior art, in the process of preparing reverse osmosis membranes, it is often necessary to dip multiple glass fiber filaments into glue and then spirally wind them around the membrane element in parallel, and after curing, form an impact-resistant and drop-resistant shell. This traditional processing method has low efficiency, a long processing cycle, and the surface flatness of the obtained reverse osmosis membrane is poor, and it is easy to have protrusions and hair. Summary of the invention

[0005] The purpose of the present invention is to solve the problems of low processing efficiency, long cycle and poor surface flatness in the process of preparing the glass fiber layer of the reverse osmosis membrane in the prior art.

[0006] In order to achieve the above object, the present invention provides a method for preparing a glass fiber layer of a reverse osmosis membrane element, the method is carried out in a winding device for a reverse osmosis membrane element, the winding device comprising:

[0007] A bottom plate, on which a support rod is fixedly arranged;

[0008] The impregnation assembly comprises a glue box for containing sealant and a pressure roller arranged inside the glue box, wherein the glue box is fixedly arranged on the bottom plate, and the impregnation assembly is used to impregnate the glass fiber mesh cloth with the sealant;

[0009] A rotating mechanism, the rotating mechanism is arranged on the supporting rod, and is used to rotate the reverse osmosis membrane element. The rotating mechanism includes a first rotating shaft assembly and a second rotating shaft assembly. One end of the reverse osmosis membrane element is sleeved on the first rotating shaft assembly, and the other end is clamped with the second rotating shaft assembly. Under the rotation of the first rotating shaft assembly and the second rotating shaft assembly, the glass fiber mesh cloth soaked with sealant is wound on the surface of the reverse osmosis membrane element.

[0010] A clamping mechanism, the clamping mechanism is used to clamp the impregnated glass fiber mesh cloth and place it on the reverse osmosis membrane element, comprising a base and a third drive motor arranged on the base, the base is arranged on the support rod, the output shaft of the third drive motor is connected to a screw nut assembly, the screw nut assembly is connected to a connecting rod assembly, the front end of the connecting rod assembly is connected to a clamping hand, and the clamping hand is opened and closed under the drive of the connecting rod assembly;

[0011] The method comprises: soaking a glass fiber mesh cloth in a sealant to obtain a glass fiber mesh cloth I, and performing a winding process on the glass fiber mesh cloth I so that the glass fiber mesh cloth I is wound on the surface of the reverse osmosis membrane element; the sealant is a two-component epoxy resin glue with a viscosity of 800-5000 mpa·s at 25° C. and a curing shrinkage rate of no more than 0.4%;

[0012] The mesh size of the glass fiber mesh cloth is not greater than 100mm 2 , weight not more than 500g / m 2 , the diameter of the mesh wire is not greater than 3mm; the conditions of the winding treatment at least include: the number of winding turns is 4-7 turns, the winding speed is 5-20rpm, and the temperature is 10-30℃.

[0013] The present invention adopts glass fiber mesh cloth of specific parameters and types, which is continuously wound on the outer layer of the reverse osmosis membrane element after being soaked in a wide-width glue groove. The invention has the characteristics of simple operation, shortened processing cycle, high efficiency and controllable quality. Specifically, the glass fiber layer of the reverse osmosis membrane prepared by the method of the present invention has high surface flatness, a large number of protrusions and hairs are greatly reduced, and also has the advantages of high impact strength and hardness.

[0014] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of a winding device for a reverse osmosis membrane element according to the present invention;

[0016] Figure 2 is a schematic structural diagram of a clamping mechanism in a winding device of a reverse osmosis membrane element according to the present invention;

[0017] Figure 3 It is a schematic structural diagram of a stirring mechanism in a winding device for a reverse osmosis membrane element according to the present invention.

[0018] Description of Reference Numerals

[0019] 100, bottom plate 200, support rod

[0020] 300, Wetting component 301, Glue box

[0021] 302, pressure roller 303, stirring mechanism

[0022] 3031, fourth drive motor 3032, mounting frame

[0023] 3033, support seat 3034, transmission shaft

[0024] 3035, coupling 3036, stirring shaft

[0025] 3037. First blade bracket 3038. Mounting ring

[0026] 3039, stirring blade 3040, second blade bracket

[0027] 400, rotating mechanism 401, first rotating shaft assembly

[0028] 4011, first rotating shaft 4012, first driving motor

[0029] 402, second rotating shaft assembly 4021, second rotating shaft

[0030] 4022, first slide bar 4023, first slide block

[0031] 4024, second drive motor 500, clamping mechanism

[0032] 501. base 502. third drive motor

[0033] 503, screw nut assembly 5031, screw

[0034] 5032, sliding nut 5033, slide groove

[0035] 5034, second slider 504, connecting rod assembly

[0036] 5041, first connecting rod 5042, second connecting rod

[0037] 5043, third connecting rod 505, clamping hand

[0038] A. Reverse osmosis membrane element B. Glass fiber mesh cloth DETAILED DESCRIPTION

[0039] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0040] In the present invention, unless otherwise specified, the room temperature or normal temperature refers to 25±2°C.

[0041] As mentioned above, the present invention provides a method for preparing a glass fiber layer of a reverse osmosis membrane element, the method being carried out in a winding device for a reverse osmosis membrane element, such as Figure 1 , Figure 2 and Figure 3 As shown, the winding device comprises:

[0042] A bottom plate 100, on which a support rod 200 is fixedly disposed;

[0043] The impregnation assembly 300 includes a glue box 301 for containing sealant and a pressure roller 302 disposed inside the glue box 301. The glue box 301 is fixedly disposed on the bottom plate 100. The impregnation assembly 300 is used to impregnate the glass fiber mesh cloth B with sealant.

[0044] A rotating mechanism 400, the rotating mechanism 400 is arranged on the support rod 200, and is used to rotate the reverse osmosis membrane element A. The rotating mechanism 400 includes a first rotating shaft assembly 401 and a second rotating shaft assembly 402. One end of the reverse osmosis membrane element A is sleeved on the first rotating shaft assembly 401, and the other end is clamped with the second rotating shaft assembly 402. Under the rotation of the first rotating shaft assembly 401 and the second rotating shaft assembly 402, the glass fiber mesh cloth B impregnated with sealant is wound on the surface of the reverse osmosis membrane element A;

[0045] A clamping mechanism 500, which is used to clamp the soaked glass fiber mesh cloth B and place it on the reverse osmosis membrane element A, and includes a base 501 and a third drive motor 502 arranged on the base 501, wherein the base 501 is arranged on the support rod 200, and a screw nut assembly 503 is connected to the output shaft of the third drive motor 502, and the screw nut assembly 503 is connected to a connecting rod assembly 504, and a clamping hand 505 is connected to the front end of the connecting rod assembly 504, and the clamping hand 505 is opened and closed under the drive of the connecting rod assembly 504;

[0046] The method comprises: soaking a glass fiber mesh cloth in a sealant to obtain a glass fiber mesh cloth I, and performing a winding process on the glass fiber mesh cloth I so that the glass fiber mesh cloth I is wound on the surface of the reverse osmosis membrane element; the sealant is a two-component epoxy resin glue having a viscosity of 300-10000 mpa·s at 25° C. after mixing and a curing shrinkage rate of no more than 2%;

[0047] The mesh size of the glass fiber mesh cloth is not greater than 100mm 2 , weight not more than 500g / m 2 , the diameter of the mesh wire is not greater than 3mm; the conditions of the winding treatment at least include: the number of winding turns is 4-7 turns, the winding speed is 5-20rpm, and the temperature is 10-30℃.

[0048] In the above-mentioned winding device, after the glass fiber mesh cloth B is impregnated with sealant in the glue box 301 through the impregnation component 300, one end of the glass fiber mesh cloth B impregnated with sealant is placed on the surface of the reverse osmosis membrane element A through the clamping hand 505 of the clamping mechanism 500, and then, with the cooperation of the rotating mechanism 400, the glass fiber mesh cloth B impregnated with sealant is continuously wound on the surface of the reverse osmosis membrane element A, which has the characteristics of simple operation, high efficiency and controllable quality.

[0049] It should be noted that one end of the glass fiber mesh cloth B is extended into the glue box 301 to be soaked in sealant, and the glass fiber mesh cloth B is clamped out of the glue box 301 by the clamping hand 505 of the clamping mechanism 500. The clamping hand 505 of the clamping mechanism 500 is always in a clamping state until the glass fiber mesh cloth B soaked in sealant is placed on the surface of the reverse osmosis membrane element A, and the clamping hand 505 is opened. At the same time, under the action of the pressure roller 302, the wide glass fiber mesh cloth B can be soaked and wound at the same time.

[0050] Preferably, the mesh size of the glass fiber mesh is 10-30 mm. 2 , weight is 200-300g / m 2 , the diameter of the mesh wire is 1-1.5 mm. The inventors found in the research process that the surface flatness of the glass fiber layer of the reverse osmosis membrane obtained by adopting the specific implementation of the preferred case is more excellent, and also has better impact resistance and hardness.

[0051] According to a particularly preferred embodiment of the present invention, the two-component epoxy resin adhesive is selected from at least one of Fuller FE7258C, Huitian 6321G, Huili 5011-11, and Jinglu JLEP-708. The inventors have found that in the specific embodiment under this preferred condition, a permeable membrane glass fiber layer with better comprehensive performance can be obtained.

[0052] Preferably, the method further comprises: curing the reverse osmosis membrane element wound with the glass fiber mesh cloth I.

[0053] Preferably, the curing treatment conditions at least include: a temperature of 10-30° C. and a time of 24-48 hours.

[0054] According to a particularly preferred embodiment of the present invention, the reverse osmosis membrane element has a length of 0.5-1.5 m and a diameter of 0.06-0.3 m.

[0055] Preferably, the first rotating shaft assembly 401 includes a first rotating shaft 4011 and a first driving motor 4012 for driving the first rotating shaft 4011 to rotate, the first rotating shaft 4011 is used to sleeve the reverse osmosis membrane element A and drive the reverse osmosis membrane element A to rotate, and one end of the first rotating shaft 4011 is set on the support rod 200, and the other end extends in a direction away from the support rod 200.

[0056] Preferably, the second rotating shaft assembly 402 includes a second rotating shaft 4021 engaged with the reverse osmosis membrane element A and an adjusting assembly for enabling the second rotating shaft 4021 to move left and right.

[0057] More preferably, the adjustment component includes a first sliding rod 4022 fixedly provided on the support rod 200, a first slider 4023 sleeved on the first sliding rod 4022, and a second driving motor 4024 driving the first slider 4023 to move left and right along the first sliding rod 4022, and the second rotating shaft 4021 is fixedly provided on the first slider 4023, and under the action of the second driving motor 4024, the second rotating shaft 4021 is moved away from or close to the reverse osmosis membrane element A.

[0058] It should be noted that, in the present invention, the second drive motor 4024 drives the first slider 4023 to perform reciprocating linear motion on the first slide rod 4022. Under the action of the second drive motor 4024, when the first slider 4023 moves along the first slide rod 4022 toward the support rod 200, the second rotating shaft 4021 approaches the clamping end of the reverse osmosis membrane element A until the second rotating shaft 4021 is clamped with the reverse osmosis membrane element A, and the second drive motor 4024 stops operating; conversely, when the first slider 4023 moves along the first slide rod 4022 in a direction away from the support rod 200, the clamping end of the second rotating shaft 4021 and the reverse osmosis membrane element A is opened. With the continuous action of the second drive motor 4024, the second rotating shaft 4021 and the reverse osmosis membrane element A move away from a preset position, and the second drive motor 4024 stops operating.

[0059] In the present invention, one end of the reverse osmosis membrane element A is sleeved on the first rotating shaft 4011, and the other end is clamped with the second rotating shaft 4021. Then, under the action of the first driving motor 4012, the first rotating shaft 4011 is rotated, so that the reverse osmosis membrane element A sleeved on the first rotating shaft 4011 rotates together, so that the glass fiber mesh cloth B is continuously wound on the surface of the reverse osmosis membrane element A, forming an impact-resistant and hard shell, which plays a role in protecting the reverse osmosis membrane element A.

[0060] Preferably, the support rod 200 is also provided with a slide rail (not shown in the drawings), the base 501 is slidably arranged on the slide rail, and the base 501 is also provided with a fifth driving motor (not shown in the drawings) to drive the base 501 to reciprocate in the vertical direction along the support rod 200 on the slide rail.

[0061] Preferably, the screw rod 5031-nut assembly 503 includes a screw rod 5031 and a sliding nut 5032 screwed onto the screw rod 5031 , a slide groove 5033 is provided on the base 501 , and a second sliding block 5034 matching the slide groove 5033 is provided at the bottom of the sliding nut 5032 .

[0062] Preferably, the connecting rod assembly 504 includes a first connecting rod 5041, a second connecting rod 5042 and a third connecting rod 5043, one end of the first connecting rod 5041 is fixed on the base 501, the other end of the first connecting rod 5041 is hinged to the middle section of the second connecting rod 5042, the second connecting rod 5042 is provided with two parallel to each other, one end of the second connecting rod 5042 is fixed to one side of the sliding nut 5032, the other end of the second connecting rod 5042 is hinged to one end of the third connecting rod 5043, and the other end of the third connecting rod 5043 is connected to the clamp 505.

[0063] In the present invention, the third driving motor 502 drives the screw rod 5031 to rotate, and the rotation of the screw rod 5031 is converted into the forward and backward sliding of the sliding nut 5032 through the cooperation between the internal thread of the sliding nut 5032 and the external thread of the screw rod 5031. The forward and backward sliding of the sliding nut 5032 drives one end of the first connecting rod 5041 to move, and the other end of the first connecting rod 5041 is respectively connected to the middle part of the second connecting rod 5042, so that the movement of the second connecting rod 5042 is converted into the opening and closing movement of the third connecting rod 5043, and the opening and closing of the third connecting rod 5043 drives the clamping hand 5041 to move. 5 opens and closes to complete the clamping and releasing actions; at the same time, the fifth driving motor drives the base 501 to move back and forth in the vertical direction along the support rod 200 on the slide rail. When the clamping hand 505 clamps the glass fiber mesh cloth B, the fifth driving motor drives the base 501 to move upward along the support rod 200, so that one end of the glass fiber mesh cloth B is placed on the surface of the reverse osmosis membrane element A; when the clamping hand 505 releases the glass fiber mesh cloth B, the fifth driving motor drives the base 501 to move downward along the support rod 200.

[0064] In the present invention, the gripper 505 includes a left gripper and a right gripper, wherein the left gripper grips the left side of the glass fiber mesh cloth B, and the right gripper grips the right side of the same glass fiber mesh cloth B.

[0065] The clamping mechanism 500 of the present invention has the characteristics of simple structure and convenient control, and can meet the requirements of automated control, thereby achieving a significant improvement in processing efficiency.

[0066] Preferably, the winding device also includes a stirring mechanism 303 arranged inside the plastic box 301, and the stirring mechanism 303 includes a fourth drive motor 3031, a stirring assembly, a mounting frame 3032 and a support seat 3033, one end of the mounting frame 3032 is fixedly arranged on the support rod 200, and the support seat 3033 is arranged on the mounting frame 3032, the stirring assembly passes through the bearing hole of the support seat 3033, and the fourth drive motor 3031 is connected to the stirring assembly.

[0067] The stirring mechanism 303 provided by the present invention adopts the fourth driving motor 3031 to drive the stirring component to force the sealant in the glue box 301 to circulate and stir, so as to achieve the purpose of improving the curing efficiency. When the stirring component is in motion, the support seat 3033 can not only support the stirring component, but also avoid radial movement, thereby ensuring the stability of the stirring movement.

[0068] In a specific embodiment of the present invention, the support seat 3033 may include a bearing seat connected to the mounting frame 3032 and a bearing body disposed on the bearing seat, and the stirring assembly is inserted into the bearing hole of the bearing body.

[0069] Preferably, the stirring assembly includes a transmission shaft 3034, a coupling 3035 and a stirring shaft 3036, wherein the transmission shaft 3034 is connected to the fourth driving motor 3031, the stirring shaft 3036 passes through the bearing hole of the support seat 3033, and the coupling 3035 connects the lower end of the transmission shaft 3034 and the upper end of the stirring shaft 3036. That is, the stirring assembly can divide the shaft into two by the coupling 3035, and the setting length of the transmission shaft 3034 and the stirring shaft 3036 is significantly shortened compared to the integrated shaft, so that it is convenient to disassemble, repair or replace the transmission shaft 3034 and the stirring shaft 3036 respectively.

[0070] More preferably, the stirring shaft 3036 includes a shaft body connected to the transmission shaft 3034 through the coupling 3035 and a first blade bracket 3037 arranged on the shaft body, and the first blade bracket 3037 includes a mounting ring 3038 sleeved on the shaft body and at least two stirring blades 3039 evenly spaced along the circumference of the mounting ring 3038 on the mounting ring 3038.

[0071] According to a particularly preferred embodiment of the present invention, the first blade bracket 3037 includes a mounting ring 3038 sleeved on the shaft body and at least two stirring blades 3039 evenly spaced along the circumference of the mounting ring 3038 and arranged on the mounting ring 3038. The stirring blade 3039 can be detachably arranged on the mounting ring 3038, so as to facilitate the replacement and maintenance of the stirring blade 3039. At the same time, a first external thread section is formed on the shaft body, and an internal thread threadedly connected to the first external thread section on the shaft body is formed on the inner side of the mounting ring 3038, so as to facilitate the disassembly and assembly of the mounting ring 3038 and the adjustment of the position.

[0072] Preferably, the stirring shaft 3036 further includes a second blade bracket 3040, and the second blade bracket 3040 is arranged on the free end of the shaft body. That is, the second blade bracket 3040 can further circulate and stir the sealant in the glue box 301. Specifically, a second external thread section is formed on the free end of the shaft body, and an internal thread threadedly connected to the second external thread section is formed on the inner side of the mounting ring 3038 of the second blade bracket 3040, so as to facilitate the disassembly and assembly of the second blade bracket 3040 and the adjustment of the position.

[0073] Preferably, the winding device further comprises a PLC controller (not shown in the drawings), and the PLC controller is communicatively connected with the rotating mechanism 400 and the clamping mechanism 500 respectively.

[0074] The present invention will be described in detail below by way of examples. In the following examples, the raw materials involved are all commercially available products.

[0075] Fiberglass mesh-1: mesh size is 16mm 2 , weight 300g / m 2 , the diameter of the network cable is 1.0mm;

[0076] Fiberglass mesh-2: mesh size is 25mm 2 , weight 200g / m 2 , the diameter of the network cable is 1.5mm;

[0077] Fiberglass mesh-3: mesh size is 50mm 2 , weight 130g / m 2 , the diameter of the network cable is 2mm;

[0078] Fiberglass mesh-4: mesh size is 110mm 2 , weight 130g / m 2 , the diameter of the network cable is 4mm;

[0079] Epoxy resin adhesive-1: FE7258C, purchased from Fule (China) Adhesive Co., Ltd.;

[0080] Epoxy resin glue-2: 6321G, purchased from Huitian New Materials Co., Ltd.;

[0081] Epoxy resin glue-3: FE7004B, purchased from Fule (China) Adhesives Co., Ltd.

[0082] Example 1

[0083] This embodiment provides a method for preparing a glass fiber layer of a reverse osmosis membrane element. Figure 1 , Figure 2 and Figure 3 The method is performed in a winding device for a reverse osmosis membrane element as shown, and comprises:

[0084] The fourth drive motor 3031 is turned on to drive the stirring assembly to continuously stir the epoxy resin in the plastic box 301 (300 rpm), and one end of the reverse osmosis membrane element A to be wound is sleeved on the first rotating shaft 4011. The second drive motor 4024 is controlled by the PLC controller to drive the first sliding rod 4022 to move toward the support rod 200, close to the clamping end of the reverse osmosis membrane element A, and clamped with the reverse osmosis membrane element A, and the second drive motor stops running;

[0085] Then, one end of the glass fiber mesh cloth B is extended into the glue box 301 to be soaked in epoxy resin glue, and the clamping hands 505 are controlled by the PLC controller to clamp the two ends of the glass fiber mesh cloth B soaked in epoxy resin glue until the fiber mesh cloth B is placed on the surface of the reverse osmosis membrane element A. After the clamping hands 505 are released, the fifth drive motor drives the base 501 to move downward along the support rod 200, and then, under the action of the PLC controller, the first drive motor is turned on to drive the first rotating shaft to rotate, thereby driving the reverse osmosis membrane element A to rotate. At the same time, under the action of the pressure roller, the glass fiber mesh cloth I is wound so that the glass fiber mesh cloth I is wound on the surface of the reverse osmosis membrane element;

[0086] The reverse osmosis membrane element wound with the glass fiber mesh cloth 1 is subjected to a curing treatment;

[0087] The glass fiber mesh cloth B is glass fiber mesh cloth-1; the epoxy resin glue is epoxy resin glue-1;

[0088] The conditions of the winding process are: the number of winding turns is 5 turns, the winding speed is 10 rpm, and the temperature is room temperature;

[0089] The curing treatment conditions are: room temperature and 48 hours.

[0090] Example 2

[0091] This embodiment refers to the method of embodiment 1. Figure 1 , Figure 2 and Figure 3 The method is carried out in the winding device for reverse osmosis membrane element shown in the figure, except that the glass fiber mesh cloth B is glass fiber mesh cloth-2, and the epoxy resin glue is epoxy resin glue-2;

[0092] The conditions of the winding process are: the number of winding turns is 4 turns, the winding speed is 5 rpm, and the temperature is room temperature;

[0093] The curing treatment conditions are: room temperature and 48 hours.

[0094] Example 3

[0095] This embodiment refers to the method of Embodiment 1, except that the glass fiber mesh cloth B is glass fiber mesh cloth-3.

[0096] Comparative Example 1

[0097] This comparative example refers to the method of Example 1, except that the glass fiber mesh cloth B is glass fiber mesh cloth-4.

[0098] Comparative Example 2

[0099] This comparative example refers to the method of Example 1, except that in the winding process, the number of winding turns is 8 turns.

[0100] Comparative Example 3

[0101] This comparative example refers to the method of Example 1, except that in the winding process, the winding speed is 25 rpm.

[0102] Comparative Example 4

[0103] This comparative example refers to the method of Example 1, except that the epoxy resin glue is epoxy resin glue-3.

[0104] Test Case

[0105] The performance of the glass fiber layer of the permeable membrane prepared in the embodiment and the comparative example was tested. The specific test results are shown in Table 1.

[0106] The test method of the processing cycle is as follows: from the time when the reverse osmosis membrane element is installed in the winding device to the end of the winding process;

[0107] The test method for the maximum deviation of the diameter is as follows: the outer diameter of the reverse osmosis membrane element should be measured using a vernier caliper (division value 0.02mm), and the measurement method is as follows: first select a position about 10mm away from the end face of the water inlet end of the reverse osmosis membrane element to measure the first data, rotate the vernier caliper 60°, measure the second data, and rotate the vernier caliper 60° in the same direction to measure the third data; then use the same method to measure the outer diameter of the reverse osmosis membrane element at the center of the length and at a position about 10mm away from the end face of the water outlet end; calculate the deviation from the nominal outer diameter of the reverse osmosis membrane element respectively;

[0108] The test method for impact strength is: use an angle grinder to cut the glass fiber layer of the reverse osmosis element into strips with a length of 80 mm and a width of 10 mm, and perform an impact test in accordance with GB / T 1043.1-2008;

[0109] The hardness test method is: use the Shaw D hardness tester to test the hardness of the glass fiber layer of the reverse osmosis element.

[0110] Table 1

[0111] Example No. Processing cycle, min Maximum diameter deviation, mm <![CDATA[Impact strength, kJ / m 2 > Hardness, D Example 1 0.5 0.8 62.3 96 Example 2 1 1.3 56.4 92 Example 3 0.5 2.6 54.7 94 Comparative Example 1 0.5 4.2 48.2 85 Comparative Example 2 2 3.5 49.6 90 Comparative Example 3 0.2 2.8 53.6 82 Comparative Example 4 0.5 4.5 51.7 73

[0112] It can be seen from the results in the above table that the present invention directly impregnates the glass fiber mesh cloth with epoxy resin glue and then winds it on the outer layer of the reverse osmosis membrane element, which significantly shortens the processing cycle and has high efficiency. In addition, the reverse osmosis membrane glass fiber layer prepared by the method provided by the present invention has high surface flatness, a large number of surface protrusions and hairs are greatly reduced, and also has the advantages of high impact strength and hardness.

[0113] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A method for preparing a glass fiber layer of a reverse osmosis membrane element, characterized in that: The method is carried out in a winding device for a reverse osmosis membrane element, the winding device comprising: A bottom plate (100), a support rod (200) being fixedly arranged on the bottom plate (100); The impregnation assembly (300) comprises a glue box (301) for containing sealant and a pressure roller (302) arranged inside the glue box (301), wherein the glue box (301) is fixedly arranged on the bottom plate (100), and the impregnation assembly (300) is used to impregnate the glass fiber mesh cloth (B) with the sealant; A rotating mechanism (400), the rotating mechanism (400) is arranged on the supporting rod (200) and is used to rotate the reverse osmosis membrane element (A), the rotating mechanism (400) comprises a first rotating shaft assembly (401) and a second rotating shaft assembly (402), one end of the reverse osmosis membrane element (A) is sleeved on the first rotating shaft assembly (401), and the other end is clamped with the second rotating shaft assembly (402), and under the rotation of the first rotating shaft assembly (401) and the second rotating shaft assembly (402), the glass fiber mesh cloth (B) soaked with sealant is wound on the surface of the reverse osmosis membrane element (A); A clamping mechanism (500), the clamping mechanism (500) is used to clamp the soaked glass fiber mesh cloth (B) and place it on the reverse osmosis membrane element (A), comprising a base (501) and a third drive motor (502) arranged on the base (501), the base (501) is arranged on the support rod (200), the output shaft of the third drive motor (502) is connected to a screw rod (5031) nut assembly (503), the screw rod (5031) nut assembly (503) is connected to a connecting rod assembly (504), the front end of the connecting rod assembly (504) is connected to a clamping hand (505), and the clamping hand (505) is opened and closed under the drive of the connecting rod assembly (504); The method comprises: soaking a glass fiber mesh cloth in a sealant to obtain a glass fiber mesh cloth I, and performing a winding process on the glass fiber mesh cloth I so that the glass fiber mesh cloth I is wound on the surface of the reverse osmosis membrane element; the sealant is a two-component epoxy resin glue having a viscosity of 300-10000 mpa·s at 25° C. after mixing and a curing shrinkage rate of no more than 2%; The mesh size of the glass fiber mesh cloth is not greater than 100mm 2 , weight not more than 500g / m 2 , the diameter of the mesh wire is not greater than 3mm; the conditions of the winding treatment at least include: the number of winding turns is 4-7 turns, the winding speed is 5-20rpm, and the temperature is 10-30℃.

2. The method according to claim 1, wherein: The mesh size of the glass fiber mesh cloth is 10-30mm 2 , weight is 200-300g / m 2 , the diameter of the network cable is 1-1.5mm.

3. The method according to claim 1 or 2, wherein: The two-component epoxy resin glue is selected from at least one of Fuller FE7258C, Huitian 6321G, Huili 5011-11, and Jinglu JLEP-708.

4. The method according to any one of claims 1 to 3, wherein: The method further comprises: curing the reverse osmosis membrane element wound with the glass fiber mesh cloth I; and / or The curing treatment conditions at least include: a temperature of 10-30° C. and a time of 24-48 hours.

5. The method according to any one of claims 1 to 4, wherein: The reverse osmosis membrane element has a length of 0.5-1.5 m and a diameter of 0.06-0.3 m.

6. The method according to any one of claims 1 to 5, wherein: The first rotating shaft assembly (401) comprises a first rotating shaft (4011) and a first driving motor (4012) for driving the first rotating shaft (4011) to rotate, the first rotating shaft (4011) being used for sleeve-mounting the reverse osmosis membrane element (A) and driving the reverse osmosis membrane element (A) to rotate, and one end of the first rotating shaft (4011) is arranged on the support rod (200), and the other end extends in a direction away from the support rod (200); and / or The second rotating shaft assembly (402) comprises a second rotating shaft (4021) engaged with the reverse osmosis membrane element (A) and an adjusting assembly for enabling the second rotating shaft (4021) to move left and right; and / or The adjustment component includes a first sliding rod (4022) fixedly arranged on the support rod (200), a first slider (4023) sleeved on the first sliding rod (4022), and a second driving motor (4024) driving the first slider (4023) to move left and right along the first sliding rod (4022); the second rotating shaft (4021) is fixedly arranged on the first slider (4023); under the action of the second driving motor (4024), the second rotating shaft (4021) is moved away from or close to the reverse osmosis membrane element (A).

7. The method according to any one of claims 1 to 6, wherein: The screw rod and nut assembly (503) comprises a screw rod (5031) and a sliding nut (5032) screwed onto the screw rod (5031); a slide groove (5033) is provided on the base (501); and a second sliding block (5034) matching with the slide groove (5033) is provided at the bottom of the sliding nut (5032); and / or The connecting rod assembly (504) comprises a first connecting rod (5041), a second connecting rod (5042) and a third connecting rod (5043), one end of the first connecting rod (5041) is fixed on the base (501), the other end of the first connecting rod (5041) is hinged to the middle section of the second connecting rod (5042), two second connecting rods (5042) are provided, which are parallel to each other, one end of the second connecting rod (5042) is fixed to one side of the sliding nut (5032), the other end of the second connecting rod (5042) is hinged to one end of the third connecting rod (5043), and the other end of the third connecting rod (5043) is connected to a clamp (505).

8. The method according to any one of claims 1 to 7, wherein: The winding device also includes a stirring mechanism (303) arranged inside the plastic box (301), and the stirring mechanism (303) includes a fourth driving motor (3031), a stirring component, a mounting frame (3032) and a supporting seat (3033), one end of the mounting frame (3032) is fixedly arranged on the support rod (200), the supporting seat (3033) is arranged on the mounting frame (3032), the stirring component passes through the bearing hole of the supporting seat (3033), and the fourth driving motor (3031) is connected to the stirring component.

9. The method according to claim 8, wherein: The stirring assembly comprises a transmission shaft (3034), a coupling (3035) and a stirring shaft (3036), wherein the transmission shaft (3034) is connected to the fourth driving motor (3031), the stirring shaft (3036) passes through a bearing hole of the support seat (3033), and the coupling (3035) connects the lower end of the transmission shaft (3034) and the upper end of the stirring shaft (3036); and / or The stirring shaft (3036) includes a shaft body connected to the transmission shaft (3034) through the coupling (3035) and a first blade bracket (3037) arranged on the shaft body, and the first blade bracket (3037) includes a mounting ring (3038) sleeved on the shaft body and at least two stirring blades (3039) evenly spaced along the circumference of the mounting ring (3038) on the mounting ring (3038).

10. The method according to any one of claims 1 to 9, wherein: The winding device further comprises a PLC controller, and the PLC controller is communicatively connected with the rotating mechanism (400) and the clamping mechanism (500) respectively.

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