Composite material for measuring pipeline of electromagnetic flowmeter and preparation method of composite material

Abstract

The invention relates to the field of instrument and meter technologies and advanced composite material preparation, in particular to a composite material for a measuring pipeline of an electromagnetic flowmeter and a preparation method of the composite material, and the composite material for the measuring pipeline of the electromagnetic flowmeter comprises polytetrafluoroethylene and polyimide. The preparation method comprises the following steps: pretreating polytetrafluoroethylene and polyimide to obtain pretreated polytetrafluoroethylene and polyimide; mixing the pretreated polytetrafluoroethylene and polyimide to obtain a first mixture; granulating the first mixture to obtain a second mixture; and carrying out extrusion injection molding on the second mixture to obtain the composite material for the measuring pipeline of the electromagnetic flowmeter. According to the prepared composite material, the wear resistance of a measuring pipeline lining of the electromagnetic flowmeter is improved, and the stability of the pipeline size is ensured.

Description

Technical Field

[0001] The present invention relates to the field of instrumentation technology and advanced material preparation, and in particular to a composite material for an electromagnetic flowmeter measuring pipeline and a preparation method thereof. Background Art

[0002] The electromagnetic flowmeter is an instrument that measures the volume flow of conductive liquids based on Faraday's law of electromagnetic induction. It is widely used in many fields such as industrial production, water conservancy monitoring, and environmental protection. The electromagnetic flowmeter has become one of the flow meters with the lowest operating energy consumption because of its simple sensor structure, no moving parts in the measuring tube, and no throttling components that hinder the flow of fluid.

[0003] With the continuous development of modern industry, electromagnetic flowmeters are widely used as important instruments for flow measurement in the production process. The measuring principle of electromagnetic flowmeters is: when a conductor cuts magnetic lines of force in a magnetic field, an induced electromotive force will be generated. In electromagnetic flowmeters, conductive liquids (such as aqueous solutions, acid solutions, alkaline solutions, etc. containing ions) are equivalent to conductors. The measuring tube is made of non-magnetic composite materials. When the magnetic field passes through the measuring tube vertically, the conductive liquid flowing in the measuring tube will cut the magnetic lines of force, thereby generating an induced electromotive force E on the electrode perpendicular to the flow direction. Its magnitude is proportional to the magnetic induction intensity B, the inner diameter of the measuring tube (i.e., the length in the direction of the liquid flow velocity) D and the average flow velocity v of the liquid. The formula is E=kBDv, where k is the instrument constant. Since the volume flow rate Q is proportional to the average flow velocity v, the volume flow rate Q of the conductive liquid can be calculated by measuring the induced electromotive force E. The measuring principle of the electromagnetic flowmeter determines that the electromagnetic flowmeter is only in contact with the measured fluid through the pipe lining and the electrode. The pipe lining of the electromagnetic flowmeter not only provides an insulating environment for the area where the fluid flows, but also must meet the requirements of pipe size accuracy. Due to the complexity of the fluid, such as containing mud, sand, particles, etc., new challenges are posed to the wear resistance of the lining in actual use.

[0004] Therefore, in order to improve the wear resistance of the pipe lining in contact with the measured fluid of the existing electromagnetic flowmeter and ensure the dimensional stability of the electromagnetic flowmeter pipe during operation, it is of practical significance to develop a composite material for the electromagnetic flowmeter measuring pipe and its preparation method. Summary of the invention

[0005] In view of this, the present invention provides a composite material for an electromagnetic flowmeter measuring pipe and a preparation method thereof, aiming to improve the wear resistance of the electromagnetic flowmeter measuring pipe lining and ensure the stability of the pipe size.

[0006] In one aspect, the present invention provides a composite material for a measuring pipe of an electromagnetic flowmeter, wherein the composite material for a measuring pipe of an electromagnetic flowmeter comprises polytetrafluoroethylene and polyimide.

[0007] Furthermore, the mass ratio of the polytetrafluoroethylene to the polyimide is 7:3-8:2.

[0008] Preferably, the polytetrafluoroethylene is tetrafluoroethylene powder, and the polyimide is polyimide powder.

[0009] Preferably, the mass ratio of polytetrafluoroethylene to polyimide is 7:3.

[0010] On the other hand, the present invention also provides a method for preparing a composite material for an electromagnetic flowmeter measuring pipe, comprising the following steps:

[0011] Pre-treating polytetrafluoroethylene and polyimide to obtain pre-treated polytetrafluoroethylene and polyimide;

[0012] Mixing the pretreated polytetrafluoroethylene and polyimide to obtain a first mixture;

[0013] granulating the first mixture to obtain a second mixture;

[0014] The second mixture is subjected to extrusion injection molding to obtain a composite material for an electromagnetic flowmeter measuring pipe.

[0015] Furthermore, when the polytetrafluoroethylene and polyimide are pretreated, the pretreatment is specifically drying, and the drying temperature is 80-120° C. and the time is 5-10 minutes.

[0016] Furthermore, the pretreated polytetrafluoroethylene and polyimide are mixed for a time of 5-10 minutes.

[0017] Furthermore, when the first mixture is granulated, the temperature is 250-320° C. and the pressure is 5-20 MPa.

[0018] Furthermore, when the second mixture is subjected to extrusion injection molding, the injection temperature is 350-380° C., the extrusion pressure is 50-90 MPa, and the heat preservation time is 3-5 minutes.

[0019] Furthermore, the pretreated polytetrafluoroethylene and polyimide are mixed in a high-speed mixer, and the rotation speed of the high-speed mixer is 200-500 r / min.

[0020] Furthermore, the method further comprises heat treating the composite material for the electromagnetic flowmeter measuring pipe, wherein the heat treatment temperature is 380-420° C. and the heating rate is 1-5° C. / min.

[0021] Furthermore, the heat treatment is carried out under a protective atmosphere.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention obtains a mixture with a stable phase by blending polytetrafluoroethylene and polyimide to achieve sufficient uniform dispersion between the two. The blended mixture is extruded and injection molded to obtain a composite material with excellent insulation performance and good wear resistance. The composite material is used for electromagnetic flowmeter measurement pipelines, can resist corrosion from various chemical media, ensure long-term stable operation in complex chemical environments, and extend the service life of the pipeline.

[0024] 2. The polytetrafluoroethylene and polyimide used in this application both have excellent electrical insulation properties. The composite material prepared by the method of this application is used for the inner lining of the electromagnetic flowmeter, which can effectively avoid interference with the measurement results due to leakage and other problems during the measurement of the electromagnetic flowmeter, thereby ensuring the accuracy of the measurement.

[0025] 3. The present invention controls the mass ratio of polytetrafluoroethylene and polyimide within the range of 7:3-8:2, so that the composite material achieves a good balance in flexibility, strength, temperature resistance, etc., meets the various performance requirements of the electromagnetic flowmeter measuring pipeline, and improves the mechanical strength and thermal stability of the composite material. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0027] Figure 1 A flow chart for preparing a composite material for an electromagnetic flowmeter measuring pipe provided in an embodiment of the present invention.

[0028] Figure 2 This is a schematic diagram comparing the friction reduction and wear resistance of the composite material provided in the embodiment of the present invention.

[0029] Figure 3 The hardness performance comparison diagram of the composite material provided in the embodiment of the present invention is shown below.

[0030] Figure 4 A schematic diagram of the process of combining the composite material provided by an embodiment of the present invention with the inner wall of the electromagnetic flowmeter measuring pipe.

[0031] Figure 5 A schematic diagram of the process of combining the composite material provided by an embodiment of the present invention with the inner wall of the electromagnetic flowmeter measuring pipe.

[0032] In the figure: 4-1: electromagnetic flowmeter measuring pipe; 4-2: composite material; 5-1: single-component solvent-based adhesive; 5-2: electromagnetic flowmeter measuring pipe inner wall surface. DETAILED DESCRIPTION

[0033] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] With the continuous development of modern industry, electromagnetic flowmeters are widely used as important instruments for flow measurement in the production process. The measurement principle of electromagnetic flowmeters determines that the only parts of the electromagnetic flowmeter that are in contact with the measured fluid are the pipe lining and electrodes. In addition to providing an insulating environment for the area where the fluid flows, the pipe lining of the electromagnetic flowmeter must also meet the requirements for pipe dimensional accuracy. Due to the complexity of the fluid, such as the presence of silt, particles, etc., new challenges are posed to the wear resistance of the lining in actual use.

[0035] Therefore, in order to improve the wear resistance of the pipe lining in contact with the measured fluid of the existing electromagnetic flowmeter and ensure the dimensional stability of the electromagnetic flowmeter pipe during operation, it is of practical significance to develop a composite material for the electromagnetic flowmeter measuring pipe and its preparation method.

[0036] The invention provides a composite material for an electromagnetic flowmeter measuring pipe. The composite material for an electromagnetic flowmeter measuring pipe comprises polytetrafluoroethylene and polyimide.

[0037] Specifically, the polytetrafluoroethylene is tetrafluoroethylene powder, and the polyimide is powder.

[0038] In some embodiments of the present application, the mass ratio of polytetrafluoroethylene to polyimide is 7:3-8:2.

[0039] Specifically, the mass ratio of the polytetrafluoroethylene to the polyimide is preferably 7:3.

[0040] It is understandable that both polytetrafluoroethylene and polyimide have excellent electrical insulation properties. The composite materials made of polytetrafluoroethylene and polyimide are used in electromagnetic flowmeters, which can effectively avoid interference with the measurement results due to leakage problems during the measurement of the electromagnetic flowmeter and ensure the accuracy of the measurement.

[0041] It is understandable that controlling the mass ratio of polytetrafluoroethylene and polyimide at 7:3-8:2 can achieve a good balance in flexibility, strength, temperature resistance and other aspects of the composite material, meet the various performance requirements of the electromagnetic flowmeter measurement pipeline, and improve the mechanical strength and thermal stability of the composite material.

[0042] See also Figure 1 As shown, a method for preparing a composite material for an electromagnetic flowmeter measuring pipe provided by an embodiment of the present invention includes:

[0043] The polytetrafluoroethylene and polyimide are pretreated to obtain pretreated polytetrafluoroethylene and polyimide.

[0044] The pretreated polytetrafluoroethylene and polyimide are mixed to obtain a first mixture.

[0045] The first mixture is granulated to obtain a second mixture.

[0046] The second mixture is subjected to extrusion injection molding to obtain a composite material for an electromagnetic flowmeter measuring pipe.

[0047] Specifically, the first mixture is granulated in a plastic granulator, and the screw speed of the plastic granulator is 50-200r / min.

[0048] It is understandable that pre-treatment of polytetrafluoroethylene and polyimide can remove impurities such as moisture in polytetrafluoroethylene and polyimide to avoid affecting the performance and quality of the composite materials during subsequent processing.

[0049] It is understood that mixing the pretreated polytetrafluoroethylene and polyimide to ensure that the two raw materials are fully and evenly mixed can ensure the consistency and stability of the composite material performance.

[0050] It is understandable that the friction coefficient of the first mixture after polytetrafluoroethylene and polyimide are mixed is very low. Direct extrusion injection molding is likely to cause the first mixture to be unable to enter the screw normally, and the first mixture needs to be granulated in a plastic granulator. The first mixture is made into pellets with a certain shape and size by granulation. These particles can be stacked and pushed on each other, and the contact area between the particles and the screw is relatively large, which can better generate friction under the push of the screw, so that the particles can follow the rotation of the screw and be continuously and stably transported. The particle size of the second mixture obtained after granulation is relatively uniform. During the screw conveying and subsequent injection molding process, the conveying and distribution of the second mixture are more uniform, which can ensure that the second mixture is filled evenly in the mold, which helps to improve the quality and performance of the composite material and ensure the dimensional accuracy and consistency of the physical properties of the composite material.

[0051] See also Figure 1As shown, in some embodiments of the present application, when polytetrafluoroethylene and polyimide are pretreated, the pretreatment is specifically drying, and the drying temperature is 80-120° C. and the time is 5-10 minutes.

[0052] Specifically, the drying temperature is preferably 110° C. and the drying time is 8 minutes.

[0053] See also Figure 1-3 As shown, in some embodiments of the present application, the mixing time of the pretreated polytetrafluoroethylene and polyimide is 5-10 minutes.

[0054] Specifically, the mixing time is preferably 9 minutes.

[0055] Specifically, when the polyimide content in the first mixture is within the range of 30%-40%, the wear resistance of the composite material for the electromagnetic flowmeter measuring pipe is improved by 4 times.

[0056] Specifically, when the polyimide content in the first mixture is within the range of 30%-40%, the friction reduction property of the composite material for the electromagnetic flowmeter measuring pipe is increased by 2 times.

[0057] Specifically, when the polyimide content in the first mixture is within the range of 30%-20%, the hardness of the composite material for the electromagnetic flowmeter measuring pipe is increased to 1.5 times.

[0058] It is understood that by mixing polytetrafluoroethylene and polyimide for a certain period of time, a highly uniformly dispersed composite material can be obtained.

[0059] It can be understood that when the polyimide content in the first mixture is 30%, that is, when the mass ratio of polytetrafluoroethylene to polyimide is 7:3, the obtained composite material for the electromagnetic flowmeter measuring pipe has the best wear resistance and hardness properties.

[0060] See also Figure 1 As shown, in some embodiments of the present application, when the first mixture is granulated, the temperature is 250-320° C. and the pressure is 5-20 MPa.

[0061] Specifically, the temperature is preferably 270° C., and the pressure is preferably 15 MPa.

[0062] See also Figure 1 As shown, in some embodiments of the present application, when the second mixture is subjected to extrusion injection molding, the injection temperature is 350-380° C., the extrusion pressure is 50-90 MPa, and the insulation time is 3-5 minutes.

[0063] Specifically, the injection temperature is preferably 360° C., the extrusion pressure is preferably 80 MPa, and the holding time is 5 minutes.

[0064] It is understandable that when extrusion injection molding is carried out, it is necessary to carry out it under certain temperature, pressure and insulation time to ensure that the composite material can obtain the ideal structure and performance during the molding process, and then when the composite material is applied to the lining of the electronic flow meter, the dimensional accuracy and surface quality of the pipe can be ensured.

[0065] See also Figure 1 As shown, in some embodiments of the present application, the pretreated polytetrafluoroethylene and polyimide are mixed in a high-speed mixer, and the rotation speed of the high-speed mixer is 200-500r / min.

[0066] Specifically, the rotation speed of the high-speed mixer is preferably 400 r / min.

[0067] See also Figure 1 As shown, in some embodiments of the present application, it also includes heat treating the composite material for the electromagnetic flowmeter measuring pipe, the heat treatment temperature is 380-420°C, and the heating rate is 1-5°C / min.

[0068] Specifically, the temperature of the heat treatment is preferably 400° C., and the heating rate is preferably 4° C. / min.

[0069] It is understandable that heat treatment can eliminate the internal stress of the composite material, improve the crystal structure of the composite material, and enhance the comprehensive performance of the composite material.

[0070] See also Figure 1 As shown, in some embodiments of the present application, the heat treatment is performed under a protective atmosphere.

[0071] Specifically, the protective atmosphere is nitrogen or argon.

[0072] It is understandable that the addition of nitrogen or argon can effectively isolate oxygen and prevent oxidation reaction of polytetrafluoroethylene and polyimide, thereby improving the purity of the prepared composite material.

[0073] It can be seen that the present invention obtains a mixture with a stable phase by blending polytetrafluoroethylene and polyimide to achieve sufficient uniform dispersion between the two. The blended mixture is extruded and injection molded to obtain a composite material with excellent insulation performance and good wear resistance. The composite material is used for electromagnetic flowmeter measurement pipelines, can resist corrosion from various chemical media, ensure long-term stable operation in complex chemical environments, and extend the service life of the pipeline.

[0074] 2. The polytetrafluoroethylene and polyimide used in this application both have excellent electrical insulation properties. The composite material prepared by the method of this application is used for the inner lining of the electromagnetic flowmeter, which can effectively avoid interference with the measurement results due to leakage and other problems during the measurement of the electromagnetic flowmeter, thereby ensuring the accuracy of the measurement.

[0075] 3. The present invention controls the mass ratio of polytetrafluoroethylene and polyimide within the range of 7:3-8:2, so that the composite material achieves a good balance in flexibility, strength, temperature resistance, etc. The composite material prepared by the present invention has not only good insulation and wear resistance, but also excellent chemical stability and resistance to chemical corrosion, and is resistant to strong acids, strong alkalis, and strong oxidants. It can meet the various performance requirements of the electromagnetic flowmeter measuring pipeline and improve the mechanical strength and thermal stability of the composite material.

[0076] See also Figure 4-5 As shown, the application example of the present invention also provides an application of a composite material for an electromagnetic flowmeter measuring pipeline, including:

[0077] S1. Select the electromagnetic flowmeter with a surface roughness value between 12.5-50 to measure the inner wall of the pipeline as the electromagnetic flowmeter application section.

[0078] S2. The electromagnetic flowmeter application section is subjected to a heating treatment to obtain a treated electromagnetic flowmeter application section.

[0079] S3. Matching the heat-treated composite material for the electromagnetic flowmeter measuring pipe with the treated inner wall of the electromagnetic flowmeter application section pipe.

[0080] S4. Use a single-component solvent-based adhesive to bond the composite material used for the electromagnetic flowmeter measuring pipe and the inner wall of the electromagnetic flowmeter measuring pipe.

[0081] S5. The composite material used for the electromagnetic flowmeter measuring pipe is firmly combined with the inner wall of the electromagnetic flowmeter application section pipe by curing and inlaying, thereby obtaining the inner wall lining of the electromagnetic flowmeter measuring pipe.

[0082] It can be understood that heating the electromagnetic flowmeter application section to expand the electromagnetic flowmeter application section is beneficial to better bonding the composite material used for the electromagnetic flowmeter measuring pipe and the inner wall of the electromagnetic flowmeter application section pipe.

[0083] It can be understood that the inner wall lining of the electromagnetic flowmeter measuring pipe prepared by the above method has excellent chemical stability and resistance to chemical corrosion, such as resistance to strong acids, strong alkalis, and strong oxidants.

[0084] It can be understood that the complex medium flowing through the inner wall lining of the measuring pipe of the electromagnetic flowmeter prepared by the above method does not include domestic sewage containing large pollutants.

[0085] It is understandable that the composite material for the electromagnetic flowmeter measuring pipe can be applied to the inner wall lining of the electromagnetic flowmeter measuring pipe, and can also be processed separately into long straight or curved pipes and other products for use.

[0086] It can be understood that the composite material used for electromagnetic flowmeter measuring pipes, in addition to having good insulation and wear resistance, is also suitable for the transportation of high-temperature liquids, with an operating temperature not exceeding 200°C.

[0087] Example 1

[0088] 1. 70 g of polytetrafluoroethylene and 30 g of polyimide were subjected to drying pretreatment respectively, the drying temperature was 90° C., and the drying time was 6 minutes to obtain pretreated polytetrafluoroethylene and polyimide;

[0089] 2. Blending the pretreated polytetrafluoroethylene and polyimide in a high-speed mixer at a rotation speed of 300 r / min for 5 minutes to obtain a highly uniformly dispersed first mixture;

[0090] 3. Put the first mixture into a plastic granulator for granulation, set the temperature to 270° C., the screw speed of the plastic granulator to 90 r / min, and the pressure to 10 MPa to obtain the second mixture after granulation.

[0091] 4. The second mixture is placed in an injection molding machine for extrusion molding. The injection molding temperature is 355° C., the extrusion pressure is 60 MPa, and the insulation time is 3 minutes. After the injection molding is completed, a composite material for the electromagnetic flowmeter measuring pipe is obtained.

[0092] 5. The obtained composite material for the electromagnetic flowmeter measuring pipe was heat treated in a nitrogen atmosphere at a temperature of 390° C. and a heating rate of 3° C. / min.

[0093] Example 2

[0094] 1. 75 g of polytetrafluoroethylene and 25 g of polyimide were pre-treated by drying at a temperature of 100° C. for 8 minutes to obtain pre-treated polytetrafluoroethylene and polyimide;

[0095] 2. Blending the pretreated polytetrafluoroethylene and polyimide in a high-speed mixer at a rotation speed of 400 r / min for 7 minutes to obtain a highly uniformly dispersed first mixture;

[0096] 3. Put the first mixture into a plastic granulator for granulation, set the temperature to 290° C., the screw speed of the plastic granulator to 150 r / min, and the pressure to 15 MPa to obtain the second mixture after granulation.

[0097] 4. The second mixture is placed in an injection molding machine for extrusion molding. The injection molding temperature is 365° C., the extrusion pressure is 70 MPa, and the insulation time is 4 minutes. After the injection molding is completed, a composite material for the electromagnetic flowmeter measuring pipe is obtained.

[0098] 5. The obtained composite material for the electromagnetic flowmeter measuring pipe was heat treated in a nitrogen atmosphere at a temperature of 400° C. and a heating rate of 4° C. / min.

[0099] Example 3

[0100] 1. 80 g of polytetrafluoroethylene and 20 g of polyimide were subjected to drying pretreatment respectively, the drying temperature was 110° C., and the drying time was 9 minutes to obtain pretreated polytetrafluoroethylene and polyimide;

[0101] 2. Blending the pretreated polytetrafluoroethylene and polyimide in a high-speed mixer at a rotation speed of 500 r / min for 9 minutes to obtain a highly uniformly dispersed first mixture;

[0102] 3. Put the first mixture into a plastic granulator for granulation, set the temperature to 310° C., the screw speed of the plastic granulator to 180 r / min, and the pressure to 20 MPa to obtain the second mixture after granulation.

[0103] 4. The second mixture is placed in an injection molding machine for extrusion molding. The injection molding temperature is 375° C., the extrusion pressure is 80 MPa, and the insulation time is 5 minutes. After the injection molding is completed, a composite material for the electromagnetic flowmeter measuring pipe is obtained.

[0104] 5. The obtained composite material for the electromagnetic flowmeter measuring pipe was heat treated in a nitrogen atmosphere at a temperature of 410° C. and a heating rate of 5° C. / min.

[0105] Example 4

[0106] 1. 60 g of polytetrafluoroethylene and 40 g of polyimide were subjected to drying pretreatment respectively, the drying temperature was 100° C., and the drying time was 8 minutes to obtain pretreated polytetrafluoroethylene and polyimide;

[0107] 2. Blending the pretreated polytetrafluoroethylene and polyimide in a high-speed mixer at a rotation speed of 450 r / min for 8 minutes to obtain a highly uniformly dispersed first mixture;

[0108] 3. Put the first mixture into a plastic granulator for granulation, set the temperature to 300° C., the screw speed of the plastic granulator to 170 r / min, and the pressure to 15 MPa to obtain the second mixture after granulation.

[0109] 4. The second mixture is placed in an injection molding machine for extrusion molding. The injection molding temperature is 355° C., the extrusion pressure is 70 MPa, and the insulation time is 4 minutes. After the injection molding is completed, a composite material for the electromagnetic flowmeter measuring pipe is obtained.

[0110] 5. The obtained composite material for the electromagnetic flowmeter measuring pipe was heat treated in a nitrogen atmosphere at a temperature of 400° C. and a heating rate of 4° C. / min.

[0111] Application Example 1

[0112] S1. Select the inner wall of the electromagnetic flowmeter measuring pipe with a surface roughness value of 20 as the electromagnetic flowmeter application section.

[0113] S2. The electromagnetic flowmeter application section is subjected to a heating treatment to obtain a treated electromagnetic flowmeter application section.

[0114] S3. Matching the heat-treated composite material for the electromagnetic flowmeter measuring pipe with the treated inner wall of the electromagnetic flowmeter application section pipe.

[0115] S4. Use a single-component solvent-based adhesive to bond the composite material used for the electromagnetic flowmeter measuring pipe and the inner wall of the electromagnetic flowmeter measuring pipe.

[0116] S5. The composite material used for the electromagnetic flowmeter measuring pipe is firmly combined with the inner wall of the electromagnetic flowmeter application section pipe by curing and inlaying, thereby obtaining the inner wall lining of the electromagnetic flowmeter measuring pipe.

[0117] Application Example 2

[0118] S1. Select the inner wall of the electromagnetic flowmeter measuring pipe with a surface roughness value of 30 as the electromagnetic flowmeter application section.

[0119] S2. The electromagnetic flowmeter application section is subjected to a heating treatment to obtain a treated electromagnetic flowmeter application section.

[0120] S3. Matching the heat-treated composite material for the electromagnetic flowmeter measuring pipe with the treated inner wall of the electromagnetic flowmeter application section pipe.

[0121] S4. Use a single-component solvent-based adhesive to bond the composite material used for the electromagnetic flowmeter measuring pipe and the inner wall of the electromagnetic flowmeter measuring pipe.

[0122] S5. The composite material used for the electromagnetic flowmeter measuring pipe is firmly combined with the inner wall of the electromagnetic flowmeter application section pipe by curing and inlaying, thereby obtaining the inner wall lining of the electromagnetic flowmeter measuring pipe.

[0123] Application Example 3

[0124] S1. Select the inner wall of the electromagnetic flowmeter measuring pipe with a surface roughness value of 40 as the electromagnetic flowmeter application section.

[0125] S2. The electromagnetic flowmeter application section is subjected to a heating treatment to obtain a treated electromagnetic flowmeter application section.

[0126] S3. Matching the heat-treated composite material for the electromagnetic flowmeter measuring pipe with the treated inner wall of the electromagnetic flowmeter application section pipe.

[0127] S4. Use a single-component solvent-based adhesive to bond the composite material used for the electromagnetic flowmeter measuring pipe and the inner wall of the electromagnetic flowmeter measuring pipe.

[0128] S5. The composite material used for the electromagnetic flowmeter measuring pipe is firmly combined with the inner wall of the electromagnetic flowmeter application section pipe by curing and inlaying, thereby obtaining the inner wall lining of the electromagnetic flowmeter measuring pipe.

[0129] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0130] The present application is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0131] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0132] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0133] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A composite material for an electromagnetic flowmeter measuring pipe, characterized in that: Includes polytetrafluoroethylene and polyimide.

2. The composite material for electromagnetic flowmeter measuring pipe according to claim 1, characterized in that: The mass ratio of the polytetrafluoroethylene to the polyimide is 7:3-8:

2.

3. A method for preparing a composite material for an electromagnetic flowmeter measuring pipe according to any one of claims 1 to 2, characterized in that: The following steps are involved: Pre-treating polytetrafluoroethylene and polyimide to obtain pre-treated polytetrafluoroethylene and polyimide; Mixing the pretreated polytetrafluoroethylene and polyimide to obtain a first mixture; granulating the first mixture to obtain a second mixture; The second mixture is subjected to extrusion injection molding to obtain a composite material for an electromagnetic flowmeter measuring pipe.

4. The method for preparing a composite material for an electromagnetic flowmeter measuring pipe according to claim 3, characterized in that: When polytetrafluoroethylene and polyimide are pretreated, the pretreatment is specifically drying, and the drying temperature is 80-120° C. and the drying time is 5-10 minutes.

5. The method for preparing a composite material for an electromagnetic flowmeter measuring pipe according to claim 3, characterized in that: The mixing time of the pretreated polytetrafluoroethylene and polyimide is 5-10 minutes.

6. The method for preparing a composite material for an electromagnetic flowmeter measuring pipe according to claim 3, characterized in that: When the first mixture is granulated, the temperature is 250-320° C. and the pressure is 5-20 MPa.

7. The method for preparing a composite material for an electromagnetic flowmeter measuring pipe according to claim 3, characterized in that: When the second mixture is subjected to extrusion injection molding, the injection temperature is 350-380° C., the extrusion pressure is 50-90 MPa, and the heat preservation time is 3-5 minutes.

8. The method for preparing a composite material for an electromagnetic flowmeter measuring pipe according to claim 5, characterized in that: The pretreated polytetrafluoroethylene and polyimide are mixed in a high-speed mixer, and the rotation speed of the high-speed mixer is 200-500r / min.

9. The method for preparing a composite material for an electromagnetic flowmeter measuring pipe according to claim 3, characterized in that: The method further comprises heat treating the composite material for the electromagnetic flowmeter measuring pipe, wherein the heat treatment temperature is 380-420° C. and the heating rate is 1-5° C. / min.

10. The method for preparing a composite material for an electromagnetic flowmeter measuring pipe according to claim 9, characterized in that: The heat treatment is carried out under a protective atmosphere.

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