Antistatic fluoroplastic compound pipeline lining designed by novel winding method

Abstract

The utility model belongs to the field of fluoroplastic pipe preparation, and particularly relates to an antistatic fluoroplastic compound pipeline lining designed by a novel winding method, which comprises a polytetrafluoroethylene electrostatic dredging inner layer, a polytetrafluoroethylene interlayer and a polytetrafluoroethylene electrostatic dredging outer layer from inside to outside in sequence, wherein the polytetrafluoroethylene electrostatic dredging inner layer and the polytetrafluoroethylene electrostatic dredging outer layer can be conductively connected through a conductive bond formed by a conductive polytetrafluoroethylene film strip which is continuously wound at the two ends of the pipeline lining. The utility model has the following beneficial effects: electrostatic charges generated in the pipeline can be conducted to the polytetrafluoroethylene electrostatic dredging outer layer through the polytetrafluoroethylene electrostatic dredging inner layer and the conductive bond in conductive connection with the two ends of the pipeline lining; and then the electrostatic charges are conducted to a metal pipeline matched with the antistatic fluoroplastic compound pipeline lining for use, so that the electrostatic charges in the pipeline are released, and a new idea is provided for the antistatic technology of the fluoroplastic pipeline lining.

Description

Technical Field

[0001] This invention belongs to the field of fluoroplastic pipe preparation, specifically relating to an antistatic fluoroplastic composite pipe liner designed using a novel winding method. Background Technology

[0002] Fluoroplastic products possess excellent mechanical properties and outstanding insulation, making them frequently used as insulating materials, particularly in the linings of pipelines and components in the petrochemical and natural gas transportation industries. However, their high resistivity introduces several problems. For instance, static charges generated internally are difficult to dissipate, leading to their accumulation and potential electrostatic discharge, resulting in unpredictable consequences and posing risks to production safety and product quality. To mitigate safety accidents caused by static electricity, it is necessary to improve the antistatic properties of fluoroplastic pipe linings. Currently, a common antistatic method for fluoroplastic pipe linings is segmented conductivity. For example, a patent (CN202322776085.X) from Hebei Hongxin Plastic Industry Co., Ltd. proposes using multiple metal rings at equal intervals to conduct static charge within the plastic pipe. However, this method has low static charge removal efficiency, causes significant pipe wear, and reduces corrosion resistance due to the presence of conductive metals. Another method is to completely replace traditional fluoroplastic pipe linings with antistatic fluoroplastic pipe linings. For instance, a patent (CN202410459233.1) from Jiangxi Sugao New Materials Co., Ltd. uses modified graphene as a conductive agent incorporated into the plastic. While this method is simple to operate and effectively removes static charge from the pipe, the excessive amount of graphene significantly increases costs, leading to reduced economic benefits. Clearly, the current antistatic technologies used for fluoroplastic pipe linings are unsatisfactory, and there is an urgent need to research and invent efficient and low-cost antistatic technologies for fluoroplastic pipe linings. This invention proposes a novel winding method for designing antistatic fluoroplastic composite pipe liners, which can not only effectively discharge the internal static charge of the pipe liner, but also greatly reduce the manufacturing cost. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings and deficiencies of existing antistatic technologies for fluoroplastic pipe linings and to provide a novel antistatic fluoroplastic composite pipe lining designed using a new winding method.

[0004] This invention provides an antistatic fluoroplastic composite pipe liner designed using a novel winding method. The antistatic fluoroplastic composite pipe liner comprises, from the inside out, a polytetrafluoroethylene (PTFE) electrostatic conductive inner layer, a PTFE interlayer, and a PTFE electrostatic conductive outer layer. The PTFE electrostatic conductive inner layer and the PTFE electrostatic conductive outer layer are both made by winding conductive PTFE film strips, and the PTFE interlayer is also made by winding PTFE film strips. The PTFE electrostatic conductive inner layer and the PTFE electrostatic conductive outer layer are electrically connected by a conductive link formed by continuously wound conductive PTFE film strips at both ends of the pipe liner.

[0005] As a further improvement of the present invention, the conductive polytetrafluoroethylene film tape is prepared by adding a certain proportion (5wt% to 40wt%) of conductive agent (such as graphene, carbon nanotubes, conductive carbon black, etc.) to the raw polytetrafluoroethylene powder, uniformly mixing and modifying it, and then pressing, high-temperature sintering and turning sheet preparation. Compared with the unmodified polytetrafluoroethylene film tape, it exhibits excellent conductivity and can quickly and effectively conduct static charges generated inside the pipe.

[0006] As a further improvement of the present invention, the PTFE electrostatic conductive inner layer is formed by winding a conductive PTFE film strip from the leftmost side of the mold tube counterclockwise in an orderly and seamless manner to the rightmost side, forming a first layer of conductive PTFE film tightly attached to the mold tube. Depending on actual needs, the conductive PTFE film strip can be wound again from the rightmost side of the mold tube in a reverse, orderly and seamless manner to the leftmost side, forming a second layer of conductive PTFE film. This process can be repeated to form the required n (n≥1) layers of conductive PTFE film, ultimately obtaining the wound PTFE electrostatic conductive inner layer. Simultaneously, the last layer of conductive PTFE film strip is retained on the rightmost side (n is an odd number of layers) or the leftmost side (n is an even number of layers) of the mold tube for subsequent winding of the PTFE electrostatic conductive outer layer and for constructing the conductive link between the PTFE electrostatic conductive inner layer and the PTFE electrostatic conductive outer layer.

[0007] As a further improvement of the present invention, the polytetrafluoroethylene (PTFE) interlayer is formed by winding a PTFE film strip onto the aforementioned wound PTFE electrostatic conductive inner layer, starting from the leftmost side of the PTFE electrostatic conductive inner layer and sequentially and without gaps, counterclockwise, to the rightmost side, forming a first layer of PTFE film tightly adhering to the PTFE electrostatic conductive inner layer; according to actual needs, the PTFE film strip can be wound from the rightmost side of the PTFE electrostatic conductive inner layer in the opposite direction and sequentially and without gaps to the leftmost side to form a second layer of PTFE film, and so on, to form the required m (m≥1) layers of PTFE film, finally obtaining the wound PTFE interlayer.

[0008] As a further improvement of the present invention, the electrostatically conductive outer layer of polytetrafluoroethylene (PTFE) is formed by sequentially and orderly winding the conductive PTFE film strip, which is the last layer of the electrostatically conductive inner layer of PTFE retained on the far right (n is an odd number of layers) or far left (n is an even number of layers) of the PTFE interlayer, onto the PTFE interlayer in an orderly and seamless manner to the other side, forming a first layer of conductive PTFE film tightly attached to the PTFE interlayer; according to actual needs, the conductive PTFE film strip is then sequentially and orderly wound onto the other side from the PTFE interlayer to form a second layer of conductive PTFE film, and so on, to form the required N (N≥1) layers of conductive PTFE film, and finally the electrostatically conductive outer layer of PTFE is obtained by winding.

[0009] After sequentially winding the polytetrafluoroethylene (PTFE) electrostatic conductive inner layer, PTFE sandwich layer, and PTFE electrostatic conductive outer layer onto the mold tube, a preform of an antistatic fluoroplastic composite pipe liner of a certain thickness can be prepared. Then, the preform is placed in an air atmosphere at a certain calcination temperature (350-450℃) for a period of time (5-12 hours) according to different liner thicknesses. After cooling, it is mechanically demolded to form an antistatic fluoroplastic composite pipe liner with a certain specification and thickness.

[0010] Finally, the antistatic fluoroplastic composite pipe liner prepared above is embedded into a metal pipe (such as stainless steel pipe, carbon steel pipe, alloy pipe, etc.) that matches the specifications and model of the antistatic fluoroplastic composite pipe liner. After mechanical rolling with embedded rollers, the antistatic fluoroplastic composite pipe liner and the metal pipe are seamlessly bonded. Finally, the two ends of the liner are flanged and bonded to the interface of the metal pipe port, and it can be put into actual production.

[0011] The beneficial effects of this invention are as follows: This invention uses conductive polytetrafluoroethylene (PTFE) film strips wound together to form an antistatic fluoroplastic composite pipe liner. Static charges generated inside the pipe can be conducted to the outer PTFE electrostatic conductive layer through conductive links that maintain conductive connections at both ends of the pipe liner. Subsequently, the static charges are conducted to a metal pipe (e.g., stainless steel pipe, carbon steel pipe, alloy pipe, etc.) that is compatible with the antistatic fluoroplastic composite pipe liner, thereby releasing the static charges inside the pipe. Therefore, the antistatic fluoroplastic composite pipe liner designed using a novel winding method provided by this invention has a significant antistatic effect compared to other antistatic technologies for fluoroplastic pipe liners, and its preparation process is simple and cost-effective. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0013] Figure 1 This is a schematic diagram of the structure of an antistatic fluoroplastic composite pipe liner designed using a novel winding method of the present invention.

[0014] Figure 2 This is a partially enlarged schematic diagram of the cross-section of an antistatic fluoroplastic composite pipe liner designed using a novel winding method of the present invention.

[0015] Figure 3 A schematic diagram of the preparation process of the antistatic fluoroplastic composite pipe liner designed by the novel winding method of the present invention is shown in the following diagrams: (a) is a schematic diagram of the preparation process of the polytetrafluoroethylene electrostatic conductive inner layer; (b) is a schematic diagram of the preparation process of the polytetrafluoroethylene sandwich layer; (c) and (d) are schematic diagrams of the preparation process of the polytetrafluoroethylene electrostatic conductive outer layer.

[0016] In the diagram, 1-Antistatic fluoroplastic composite pipe lining; 2-Polytetrafluoroethylene (PTFE) electrostatic conductive inner layer; 3-PTFE interlayer; 4-PTFE electrostatic conductive outer layer; 5-Conductive PTFE film strip; 6-PTFE film strip; 7-Conductive ribbon; 8-Mold tube; 9-Metal pipe Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. The directional and positional terms used in this invention, such as "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the directions or positions in the accompanying drawings. Therefore, the directional and positional terms used are for illustrating and understanding this invention, and not for limiting the scope of protection of this invention.

[0018] like Figure 1 and Figure 2 As shown, an antistatic fluoroplastic composite pipe liner 1 designed using a novel winding method includes, from the inside out, a polytetrafluoroethylene (PTFE) electrostatic conductive inner layer 2, a PTFE interlayer 3, and a PTFE electrostatic conductive outer layer 4. The PTFE electrostatic conductive inner layer 2 and the PTFE electrostatic conductive outer layer 4 are both made by winding conductive PTFE film strips 5, while the PTFE interlayer 3 is made by winding PTFE film strips 6. The PTFE electrostatic conductive inner layer 2 and the PTFE electrostatic conductive outer layer 4 are electrically connected by a conductive ribbon 7 formed by continuously wound conductive PTFE film strips 5 at both ends of the pipe liner.

[0019] As a further improvement of the present invention, the conductive polytetrafluoroethylene film strip 5 is prepared by adding a certain proportion (5wt% to 40wt%) of conductive agent (such as graphene, carbon nanotubes, conductive carbon black, etc.) to the raw polytetrafluoroethylene powder, uniformly mixing and modifying it, and then pressing, high-temperature sintering and turning sheet preparation. Compared with the unmodified polytetrafluoroethylene film strip 6, it exhibits excellent conductivity and can quickly and effectively conduct static charges generated inside the pipe.

[0020] like Figure 3(a) The PTFE electrostatic conductive inner layer 2 is formed by winding a conductive PTFE film strip 5 from the leftmost side of the mold tube 8 counterclockwise in an orderly and seamless manner to the rightmost side, forming a first layer of conductive PTFE film tightly attached to the mold tube 8. According to actual needs, the conductive PTFE film strip 5 can be wound from the rightmost side of the mold tube 8 in a reverse order and in an orderly and seamless manner to the leftmost side, forming a second layer of conductive PTFE film. This cycle can be repeated to form the required n (n≥1) layers of conductive PTFE film, and finally the wound PTFE electrostatic conductive inner layer 2 is obtained. At the same time, the conductive PTFE film strip 5 of the last layer is retained on the rightmost side (n is an odd number of layers) or the leftmost side (n is an even number of layers) of the mold tube 8 for subsequent winding preparation of the PTFE electrostatic conductive outer layer 4 and to construct the conductive link between the PTFE electrostatic conductive inner layer and the PTFE electrostatic conductive outer layer.

[0021] like Figure 3 (b) The polytetrafluoroethylene interlayer 3 is formed by winding a polytetrafluoroethylene film strip 6 onto the above-mentioned wound polytetrafluoroethylene electrostatic conductive inner layer 2 in a counterclockwise orderly and seamless manner from the leftmost side of the polytetrafluoroethylene electrostatic conductive inner layer 2 to the rightmost side, forming a first layer of polytetrafluoroethylene film tightly attached to the polytetrafluoroethylene electrostatic conductive inner layer 2; according to actual needs, the polytetrafluoroethylene film strip 6 can be wound from the rightmost side of the polytetrafluoroethylene electrostatic conductive inner layer 2 in the opposite direction and then wound in an orderly and seamless manner to the leftmost side to form a second layer of polytetrafluoroethylene film. This cycle can be repeated to form the required m (m≥1) layers of polytetrafluoroethylene film, and finally the wound polytetrafluoroethylene interlayer 3 is obtained.

[0022] The aforementioned PTFE electrostatic conductive outer layer 4 is composed of a conductive PTFE film strip 5 (e.g., the last layer of the PTFE electrostatic conductive inner layer 2, which is retained on the far right (n is an odd number of layers) or far left (n is an even number of layers) of the mold tube 8. Figure 3 (c) As shown, the polytetrafluoroethylene (PTFE) interlayer 3 is wound sequentially and without gaps from the rightmost side (where n is an odd number of layers) or the leftmost side (where n is an even number of layers) to the other side, forming a first conductive PTFE film tightly attached to the PTFE interlayer 3. Figure 3 (d) According to actual needs, the conductive polytetrafluoroethylene film strip 5 is wound from the polytetrafluoroethylene interlayer 3 in reverse order and sequentially without gaps to the other side to form a second conductive polytetrafluoroethylene film. This cycle can be repeated to form the required N (N≥1) layers of conductive polytetrafluoroethylene film, and finally the wound polytetrafluoroethylene electrostatic conductive outer layer 4 is obtained.

[0023] After the polytetrafluoroethylene (PTFE) electrostatic conductive inner layer 2, PTFE sandwich layer 3, and PTFE electrostatic conductive outer layer 4 are sequentially wound and formed on the mold tube 8, an antistatic fluoroplastic composite pipe liner preform of a certain thickness can be prepared. Then, the preform is placed in an air atmosphere at a certain calcination temperature (350-450℃) for a period of time (5-12 hours) according to different liner thicknesses. After cooling, it is mechanically demolded to form an antistatic fluoroplastic composite pipe liner 1 with a certain specification and thickness.

[0024] Finally, the antistatic fluoroplastic composite pipe liner 1 prepared above is embedded into a metal pipe 9 (such as stainless steel pipe, carbon steel pipe, alloy pipe, etc.) that matches the specifications and model of the antistatic fluoroplastic composite pipe liner 1. After mechanical rolling with embedded rollers, the antistatic fluoroplastic composite pipe liner 1 and the metal pipe 8 are seamlessly bonded. Finally, the two ends of the liner are flanged and bonded to the interface of the metal pipe 8 port, and it can be put into actual production.

[0025] The present invention provides an antistatic fluoroplastic composite pipe liner 1 designed by a novel winding method. The static charge generated inside the liner can be conducted to the PTFE electrostatic conductive outer layer 4 through the PTFE electrostatic conductive inner layer 2 and the conductive ribbon 7 that maintains a conductive connection at both ends of the pipe liner. Subsequently, the static charge is conducted to the metal pipe 9 (e.g., stainless steel pipe, carbon steel pipe, alloy pipe, etc.) that is matched with the antistatic fluoroplastic composite pipe liner 1, thereby realizing the release of static charge inside the pipe.

[0026] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still covered by the present invention.

Claims

1. A new winding method designed anti-static fluoroplastic composite pipe lining, characterized by: The anti-static fluoroplastic composite pipe lining comprises, from inside to outside, a polytetrafluoroethylene electrostatically conductive inner layer, a polytetrafluoroethylene interlayer and a polytetrafluoroethylene electrostatically conductive outer layer, wherein the polytetrafluoroethylene electrostatically conductive inner layer and the polytetrafluoroethylene electrostatically conductive outer layer are both made of a conductive polytetrafluoroethylene film strip, and the polytetrafluoroethylene interlayer is made of a polytetrafluoroethylene film strip.

2. A novel winding method designed anti-static fluoroplastic composite pipe lining according to claim 1, characterized by: The polytetrafluoroethylene electrostatically conductive inner layer and the polytetrafluoroethylene electrostatically conductive outer layer can be electrically connected through a conductive knot formed by a conductive polytetrafluoroethylene film strip continuously wound at both ends of the pipe lining.

3. A novel winding method designed anti-static fluoroplastic composite pipe lining according to claim 1, characterized by: The polytetrafluoroethylene electrostatically conductive inner layer is formed by winding a conductive polytetrafluoroethylene film strip on a mold pipe of a selected specification model from the leftmost side of the mold pipe counterclockwise in order and without gaps to the rightmost side, forming a first layer of conductive polytetrafluoroethylene film closely attached to the mold pipe; according to actual needs, the conductive polytetrafluoroethylene film strip can be further wound from the rightmost side of the mold pipe to the leftmost side in reverse order and without gaps to form a second layer of conductive polytetrafluoroethylene film, and this cycle can form n (n≥1) layers of conductive polytetrafluoroethylene film as needed, finally obtaining a wound polytetrafluoroethylene electrostatically conductive inner layer; at the same time, the conductive polytetrafluoroethylene film strip wound on the last layer is retained at the rightmost side (n is an odd number) or the leftmost side (n is an even number) of the mold pipe, which is used for subsequent winding and preparation of the polytetrafluoroethylene electrostatically conductive outer layer and for building the conductive knot between the polytetrafluoroethylene electrostatically conductive inner layer and the polytetrafluoroethylene electrostatically conductive outer layer.

4. A novel winding method designed anti-static fluoroplastic composite pipe lining according to claim 1, characterized by: The polytetrafluoroethylene interlayer is formed by winding a polytetrafluoroethylene film strip on the wound polytetrafluoroethylene electrostatically conductive inner layer from the leftmost side of the polytetrafluoroethylene electrostatically conductive inner layer counterclockwise in order and without gaps to the rightmost side, forming a first layer of polytetrafluoroethylene film closely attached to the polytetrafluoroethylene electrostatically conductive inner layer; according to actual needs, the polytetrafluoroethylene film strip can be further wound from the rightmost side of the polytetrafluoroethylene electrostatically conductive inner layer to the leftmost side in reverse order and without gaps to form a second layer of polytetrafluoroethylene film, and this cycle can form m (m≥1) layers of polytetrafluoroethylene film as needed, finally obtaining a wound polytetrafluoroethylene interlayer.

5. A novel winding method designed anti-static fluoroplastic composite pipe lining according to claim 1, characterized by: The polytetrafluoroethylene electrostatically conductive outer layer is formed by winding the conductive polytetrafluoroethylene film strip retained on the last layer of the polytetrafluoroethylene electrostatically conductive inner layer at the rightmost side (n is an odd number) or the leftmost side (n is an even number) of the polytetrafluoroethylene interlayer from the rightmost side (n is an odd number) or the leftmost side (n is an even number) to the other side in reverse order and without gaps, forming a first layer of conductive polytetrafluoroethylene film closely attached to the polytetrafluoroethylene interlayer; according to actual needs, the conductive polytetrafluoroethylene film strip can be further wound from the polytetrafluoroethylene interlayer to the other side in reverse order and without gaps to form a second layer of conductive polytetrafluoroethylene film, and this cycle can form N (N≥1) layers of conductive polytetrafluoroethylene film as needed, finally obtaining a wound polytetrafluoroethylene electrostatically conductive outer layer.

6. A novel winding method designed anti-static fluoroplastic composite pipe lining according to claim 1 characterized by: After the polytetrafluoroethylene electrostatically conductive inner layer, the polytetrafluoroethylene interlayer and the polytetrafluoroethylene electrostatically conductive outer layer are sequentially wound and formed on the mold tube, an antistatic fluoroplastic composite pipe lining preform can be prepared; the preform is placed in a calcination temperature of 350-450℃ for 5-12 hours in an air atmosphere, and after cooling, an antistatic fluoroplastic composite pipe lining is formed through mechanical demolding treatment.

7. A novel winding method designed anti-static fluoroplastic composite pipe lining according to claim 1 characterized by: The antistatic fluoroplastic composite pipe lining is embedded into a metal pipe matching the specification and model of the antistatic fluoroplastic composite pipe lining, and is mechanically rolled by an inlaid roller to realize seamless fitting of the antistatic fluoroplastic composite pipe lining and the metal pipe. Finally, the antistatic fluoroplastic composite pipe lining is flanged at both ends to fit the interface of the metal pipe port. The metal pipe can be a stainless steel pipe, a carbon steel pipe or an alloy pipe.

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