Fiber-reinforced composite pipe and method of making the same

Abstract

The application relates to a fiber-reinforced composite pipe and a preparation method thereof, and relates to the technical field of pipes. The fiber-reinforced composite pipe is prepared by using a hot forming process. The fiber-reinforced composite pipe comprises reinforcing fibers and at least two pipe bodies. An overlapping structure is arranged between two adjacent pipe bodies. The overlapping structure is arranged in a spiral mode. The reinforcing fibers are arranged in the overlapping structure in a spiral mode. The reinforcing fibers comprise first fiber ropes and second fiber ropes. The first fiber ropes and the second fiber ropes are arranged in the gaps of the overlapping structure. The fiber-reinforced composite pipe is provided with the reinforcing fibers arranged in a spiral mode, so that the performance of the drainage pipe is greatly improved, the raw material is greatly saved, and the production cost is greatly reduced. In addition, the pipe material is prepared by using the hot forming process, so that the inner layer of the pipe material forms a complete whole without a connecting joint, water leakage is avoided, and the service life and the use reliability of the drainage pipe are remarkably improved.

Description

Technical Field

[0001] This application relates to the field of pipe technology, and in particular to a fiber-reinforced composite pipe and its preparation method. Background Technology

[0002] Drainage pipes primarily handle rainwater, sewage, and agricultural irrigation. They are categorized into plastic, concrete, and reinforced concrete pipes. Plastic drainage pipes are widely used due to their low cost and resistance to most household and industrial chemicals. Currently, most plastic drainage pipes on the market are made primarily of PE (polyethylene). PE, as a widely used material for drainage pipes, has many advantages, such as ease of construction and maintenance, long service life, and resistance to most household and industrial chemicals. However, it has a drawback: the elastic modulus of PE resin is low. Achieving high ring stiffness in drainage pipes requires a significant amount of material. Traditionally, structural designs are used to increase ring stiffness, but these pipes are heavy and have high production costs. Another method is to use steel frames or wires through various structures to increase ring stiffness. This method saves on raw materials, but steel is prone to corrosion, and once corroded, the entire pipe structure can collapse. Therefore, steel-reinforced pipes pose a significant safety hazard. Summary of the Invention

[0003] This application provides a fiber-reinforced composite pipe and its preparation method to solve the technical problems of low tensile strength, short service life and low reliability of existing drainage pipes.

[0004] In a first aspect, this application provides a fiber-reinforced composite tube, which is manufactured by a hot forming process. The fiber-reinforced composite tube includes reinforcing fibers and at least two tube bodies. An overlapping structure is provided between two adjacent tube bodies. The overlapping structure is spirally arranged. The reinforcing fibers are spirally threaded through the overlapping structure. The reinforcing fibers include a first fiber rope and a second fiber rope. Both the first fiber rope and the second fiber rope are threaded through the gap in the overlapping structure.

[0005] Furthermore, the gaps in the overlapping structure are filled with adhesive material, with the first fiber rope located on the outside of the adhesive material and the second fiber rope located on the inside of the adhesive material.

[0006] Furthermore, a sealing layer is provided at the gap opening of the overlapping structure, and the first fiber rope is located inside the sealing layer.

[0007] Furthermore, both the first and second fiber ropes are made of carbon fiber, basalt fiber, or ultra-high molecular weight polyethylene fiber.

[0008] Furthermore, the overlapping structure includes a first helical flange and a second helical flange, which are respectively disposed at both ends of the tube body. The inner side of the first helical flange is provided with an overlapping groove, and the inner side of the second helical flange is provided with an overlapping block adapted to the overlapping groove.

[0009] Furthermore, both the first helical flange and the second helical flange are hollow structures.

[0010] Furthermore, it also includes a sealing layer, which is disposed on the inner wall of the pipe and seals the inner wall of the overlapping structure.

[0011] Furthermore, the sealing layer includes a sealing part and a filling part. The sealing part is disposed on the inner wall of the pipe body, and the filling part is disposed on the outside of the sealing part and fills the gap between the overlapping block and the overlapping groove.

[0012] Furthermore, the pipe body is a PE pipe.

[0013] Secondly, this application provides a method for preparing the fiber-reinforced composite tube according to any one of the first aspects, the method comprising the following steps:

[0014] To obtain strip profiles;

[0015] The first molten material is applied to the bottom and overlap of the strip profile, and then it is rotated and wound to obtain a spiral tube with overlapping front and rear ends;

[0016] A second molten material is applied to the overlap of the spiral pipe at the front and rear, and two non-metallic fiber ropes are laid. Then, a third molten material is applied to seal the top, thus obtaining the fiber-reinforced composite pipe.

[0017] Furthermore, the step of obtaining the strip profile includes:

[0018] Polyethylene material is added to an extruder and then extruded through a die to obtain molten polyethylene.

[0019] The polyethylene molten material is shaped using a shaping mold to obtain the strip profile.

[0020] Furthermore, the first melt, the second melt, and the third melt are all polyethylene melts, and the non-metallic fiber rope is made of at least one of carbon fiber, basalt fiber, and ultra-high molecular weight polyethylene fiber.

[0021] The technical solutions provided in this application have at least the following advantages compared with the prior art:

[0022] This invention uses spirally arranged reinforcing fibers to strengthen the pipe body, which greatly improves the performance of the drainage pipe, saves a lot of raw materials, and greatly reduces production costs. Moreover, the bottom of the profile in this invention adopts a hot forming process, which makes the inner layer of the pipe form a complete whole without joints, eliminating water leakage and significantly improving the service life and reliability of the drainage pipe. It effectively solves the problems of low tensile strength, short service life and low reliability of existing drainage pipes. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A structural schematic diagram of one embodiment provided in this application;

[0026] Figure 2 for Figure 1 Enlarged view of section A in the middle;

[0027] Figure 3 This is a schematic diagram of the structure of the strip profile in one embodiment of the present application;

[0028] Figure 4 Flowchart of the method for preparing the fiber-reinforced composite pipe provided in this application Figure 1 ;

[0029] Figure 5 Flowchart of the method for preparing the fiber-reinforced composite pipe provided in this application Figure 2 ;

[0030] In the figure: 1-reinforcing fiber; 2-tube body; 3-overlapping structure; 4-first fiber rope; 5-second fiber rope; 6-adhesive material; 7-sealing layer; 8-first spiral flange; 9-second spiral flange; 10-sealing part; 11-filling part; 12-strip profile. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0033] In a first aspect, this application provides a fiber-reinforced composite pipe, which is manufactured using a hot-forming process, such as... Figures 1-3 As shown, the system includes reinforcing fibers 1 and multiple pipe bodies 2. The pipe bodies 2 are PE pipes, and an overlapping structure 3 is provided between adjacent pipe bodies 2. The overlapping structure 3 is spirally arranged, and the reinforcing fibers 1 are spirally threaded through the overlapping structure 3. The reinforcing fibers include first fiber ropes 4 and second fiber ropes 5, both of which are threaded through the gaps in the overlapping structure. This invention uses spirally arranged reinforcing fibers 1 to strengthen the pipe bodies 2, significantly improving the performance of the drainage pipe, greatly saving raw materials, significantly reducing production costs, and also improving the service life and reliability of the drainage pipe.

[0034] like Figure 2 As shown, specifically, the overlapping structure 3 includes a first helical flange 8 and a second helical flange 9, both of which are hollow structures. The first helical flange 8 and the second helical flange 9 are respectively disposed at both ends of the tube body 2. The inner side of the first helical flange 8 is provided with an overlapping groove, and the inner side of the second helical flange 9 is provided with an overlapping block adapted to the overlapping groove. Two adjacent tube bodies 2 are connected by the first helical flange 8 and the second helical flange 9. The overlapping groove of the first helical flange 8 and the overlapping block of the second helical flange 9 cooperate with each other, improving the connection stability of the two tube bodies 2.

[0035] like Figure 3 As shown, the pipe body 2 is formed by rolling a strip profile 12, and the first spiral flange 8 and the second spiral flange 9 are pre-set on the strip profile 12. After multiple pipe bodies 2 are connected, multiple overlapping structures 3 are spirally arranged on the surface of the drainage pipe.

[0036] The drain pipe also includes a sealing layer, which is installed on the inner wall of the pipe body 2 and seals the inner wall of the overlapping structure 3. The sealing layer makes the interior of the drain pipe a complete whole without joints, thus eliminating leakage problems.

[0037] Specifically, the sealing layer includes a sealing part 10 and a filling part 11. The sealing part 10 is disposed on the inner wall of the pipe body 2, and the filling part 11 is disposed on the outside of the sealing part 10 and fills the gap between the overlapping block and the overlapping groove, thereby improving the sealing effect of the overlapping block and the overlapping groove.

[0038] like Figure 2 As shown, in this embodiment, the reinforcing fiber 1 includes a first fiber rope 4 and a second fiber rope 5, both of which are threaded through the gaps in the overlapping structure 3. The first fiber rope 4 and the second fiber rope 5 are located on the outside of the overlapping block and within the gap between the first helical flange 8 and the second helical flange 9, thereby improving the strength of the drainage pipe.

[0039] Preferably, the gap between the first helical flange 8 and the second helical flange 9 is filled with adhesive 6, the first fiber rope 4 is located on the outside of the adhesive 6, and the second fiber rope 5 is located on the inside of the adhesive 6. A sealing layer 7 is provided at the opening of the gap between the first helical flange 8 and the second helical flange 9, and the first fiber rope 4 is located on the inside of the sealing layer 7. The sealing layer 7 seals the gap between the first helical flange 8 and the second helical flange 9.

[0040] Among them, the first fiber rope 4 and the second fiber rope 5 are both non-metallic fiber ropes. The non-metallic fiber ropes are made of carbon fiber, basalt fiber or ultra-high molecular weight polyethylene fiber. The tensile strength of carbon fiber, basalt fiber and ultra-high molecular weight polyethylene fiber is several times that of steel of the same volume, and hundreds of times higher than the tensile strength of high-density PE of the same volume. The non-metallic fiber ropes and PE pipes work together to greatly enhance the strength of the drainage pipe.

[0041] Secondly, based on a general inventive concept, this application provides a method for preparing the fiber-reinforced composite tube as described in any of the first aspects, such as... Figure 4 and Figure 5 As shown, the preparation method includes the following steps:

[0042] To obtain strip profiles;

[0043] The first molten material is applied to the bottom and overlap of the strip profile, and then it is rotated and wound to obtain a spiral tube with overlapping front and rear ends;

[0044] A second molten material is applied to the overlap of the spiral pipe at the front and rear, and two non-metallic fiber ropes are laid. Then, a third molten material is applied to seal the top, thus obtaining the fiber-reinforced composite pipe.

[0045] The fiber-reinforced composite pipe preparation method provided in this application uses a hot forming process at the bottom of the profile to form a complete whole with no seams, thus eliminating water leakage and significantly improving the service life and reliability of the drainage pipe.

[0046] In some specific embodiments, the above preparation method may include the following process: first, a first extruder extrudes PE material through a die, and then shapes it into a strip profile 12 through a shaping die. Next, a second extruder, connected to a co-extrusion die, extrudes molten PE material to coat the bottom and overlap of the strip profile 12. Then, a mechanism rotating around a center rolls the strip profile 12 into a spiral tube with overlapping sections. A third extruder then extrudes molten material to coat the overlap of the spiral tube, bonding the spiral tube into a single unit. Simultaneously, two non-metallic fiber ropes are laid at the overlap to strengthen the spiral tube. Finally, a fourth extruder extrudes a sealing layer 7 to cover the non-metallic fiber ropes.

[0047] In some specific embodiments, the first melt, the second melt, and the third melt are all polyethylene melts, and the material of the non-metallic fiber rope includes at least one of carbon fiber, basalt fiber, and ultra-high molecular weight polyethylene fiber.

[0048] The present application is further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the application. Experimental methods in the following embodiments that do not specify specific conditions are generally determined according to national standards. If there is no corresponding national standard, then general international standards, conventional conditions, or conditions recommended by the manufacturer are followed.

[0049] Example 1

[0050] This embodiment provides a fiber-reinforced composite pipe, which is manufactured using a hot-forming process. It includes reinforcing fibers 1 and multiple pipe bodies 2, each pipe body 2 being a PE pipe. An overlapping structure 3 is provided between adjacent pipe bodies 2, and the overlapping structure 3 is spirally arranged. The reinforcing fibers 1 are spirally threaded through the overlapping structure 3. The reinforcing fibers include first fiber ropes 4 and second fiber ropes 5, both of which are threaded through the gaps in the overlapping structure. This invention uses spirally arranged reinforcing fibers 1 to strengthen the pipe bodies 2, significantly improving the performance of the drainage pipe, greatly saving raw materials, significantly reducing production costs, and also improving the service life and reliability of the drainage pipe.

[0051] like Figure 2As shown, specifically, the overlapping structure 3 includes a first helical flange 8 and a second helical flange 9, both of which are hollow structures. The first helical flange 8 and the second helical flange 9 are respectively disposed at both ends of the tube body 2. The inner side of the first helical flange 8 is provided with an overlapping groove, and the inner side of the second helical flange 9 is provided with an overlapping block adapted to the overlapping groove. Two adjacent tube bodies 2 are connected by the first helical flange 8 and the second helical flange 9. The overlapping groove of the first helical flange 8 and the overlapping block of the second helical flange 9 cooperate with each other, improving the connection stability of the two tube bodies 2.

[0052] like Figure 3 As shown, the pipe body 2 is formed by rolling a strip profile 12, and the first spiral flange 8 and the second spiral flange 9 are pre-set on the strip profile 12. After multiple pipe bodies 2 are connected, multiple overlapping structures 3 are spirally arranged on the surface of the drainage pipe.

[0053] The drain pipe also includes a sealing layer, which is installed on the inner wall of the pipe body 2 and seals the inner wall of the overlapping structure 3. The sealing layer makes the interior of the drain pipe a complete whole without joints, thus eliminating leakage problems.

[0054] Specifically, the sealing layer includes a sealing part 10 and a filling part 11. The sealing part 10 is disposed on the inner wall of the pipe body 2, and the filling part 11 is disposed on the outside of the sealing part 10 and fills the gap between the overlapping block and the overlapping groove, thereby improving the sealing effect of the overlapping block and the overlapping groove.

[0055] like Figure 2 As shown, in this embodiment, the reinforcing fiber 1 includes a first fiber rope 4 and a second fiber rope 5, both of which are threaded through the gaps in the overlapping structure 3. The first fiber rope 4 and the second fiber rope 5 are located on the outside of the overlapping block and within the gap between the first helical flange 8 and the second helical flange 9, thereby improving the strength of the drainage pipe.

[0056] Preferably, the gap between the first helical flange 8 and the second helical flange 9 is filled with adhesive 6, the first fiber rope 4 is located on the outside of the adhesive 6, and the second fiber rope 5 is located on the inside of the adhesive 6. A sealing layer 7 is provided at the opening of the gap between the first helical flange 8 and the second helical flange 9, and the first fiber rope 4 is located on the inside of the sealing layer 7. The sealing layer 7 seals the gap between the first helical flange 8 and the second helical flange 9.

[0057] Among them, the first fiber rope 4 and the second fiber rope 5 are both non-metallic fiber ropes. The non-metallic fiber ropes are made of carbon fiber, basalt fiber or ultra-high molecular weight polyethylene fiber. The tensile strength of carbon fiber, basalt fiber and ultra-high molecular weight polyethylene fiber is several times that of steel of the same volume, and hundreds of times higher than the tensile strength of high-density PE of the same volume. The non-metallic fiber ropes and PE pipes work together to greatly enhance the strength of the drainage pipe.

[0058] like Figure 4 and Figure 5 As shown, the production method of the fiber-reinforced composite pipe includes the following steps: First, a first extruder extrudes PE material through a die, which is then shaped into a strip profile 12 by a shaping die. Next, a second extruder, connected to a co-extrusion die, extrudes molten PE material to coat the bottom and overlap of the strip profile 12. Then, a mechanism rotating around a center rolls the strip profile 12 into a spiral pipe with overlapping sections. A third extruder extrudes molten material to coat the overlap of the spiral pipe, bonding the spiral pipe into a single unit. Simultaneously, two non-metallic fiber ropes are laid at the overlap to strengthen the spiral pipe. Finally, a fourth extruder extrudes a sealing layer 7 to cover the non-metallic fiber ropes.

[0059] Testing revealed that, compared to high-density PE drainage pipes of the same volume, the fiber-reinforced composite pipe provided in this embodiment has 800 times higher tensile strength, significantly improving its service life and reliability.

[0060] Various embodiments of this application may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a hard limitation on the scope of this application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Furthermore, whenever a numerical range is referred to herein, it means including any referenced number (fraction or integer) within the referred range.

[0061] In this application, unless otherwise stated, directional terms such as "upper" and "lower" specifically refer to the drawing directions in the accompanying drawings. Furthermore, in the description of this application, terms such as "comprising" and "including" mean "including but not limited to." In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In this document, "and / or" describes the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, or B alone. A and B can be singular or plural. In this document, "at least one" means one or more, and "more than one" means two or more. "At least one," "at least one of the following," or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, "at least one of a, b, or c" or "at least one of a, b, and c" can both mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be a single or multiple.

[0062] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A fiber-reinforced composite pipe, characterized by, The fiber-reinforced composite pipe is made by a hot forming process, and comprises reinforcing fibers (1) and at least two pipe bodies (2), and a lap joint structure (3) is arranged between two adjacent pipe bodies (2), the lap joint structure (3) is arranged in a spiral manner, the reinforcing fibers (1) are arranged in the lap joint structure (3) in a spiral manner, and the reinforcing fibers (1) comprise a first fiber rope (4) and a second fiber rope (5), the first fiber rope (4) and the second fiber rope (5) are arranged in the gap of the lap joint structure (3). The gap of the lap joint structure (3) is filled with adhesive (6), the first fiber rope (4) is located on the outer side of the adhesive (6), and the second fiber rope (5) is located on the inner side of the adhesive (6). A capping layer (7) is arranged at the gap opening of the lap joint structure (3), and the first fiber rope (4) is located on the inner side of the capping layer (7). The preparation method of the fiber-reinforced composite pipe comprises the following steps: a strip-shaped profile is obtained; a first molten material is coated on the bottom and the lap joint of the strip-shaped profile, and then rotary winding is performed to obtain a front-lap jointed spiral pipe; a second molten material is coated on the lap joint of the front-lap jointed spiral pipe, two non-metallic fiber ropes are laid, and then a third molten material is coated to cap, thereby obtaining the fiber-reinforced composite pipe; the step of obtaining the strip-shaped profile comprises: polyethylene material is added into an extruder, and then polyethylene molten material is obtained through an extrusion die; the polyethylene molten material is shaped by a shaping die to obtain the strip-shaped profile; the first molten material, the second molten material and the third molten material are all polyethylene molten materials, and the material of the non-metallic fiber rope comprises at least one of carbon fiber, basalt fiber and ultra-molecular weight polyethylene fiber.

2. The fiber-reinforced composite pipe according to claim 1, characterized by The lap joint structure (3) comprises a first spiral flange (8) and a second spiral flange (9), the first spiral flange (8) and the second spiral flange (9) are arranged at two ends of the pipe body (2) respectively, the inner side of the first spiral flange (8) is provided with a lap joint groove, and the inner side of the second spiral flange (9) is provided with a lap joint block matched with the lap joint groove.

3. The fiber reinforced composite pipe according to claim 2, characterized in that, The first spiral flange (8) and the second spiral flange (9) are both hollow structures.

4. The fiber reinforced composite pipe according to claim 1, characterized by, The fiber-reinforced composite pipe further comprises a sealing layer arranged on the inner wall of the pipe body (2) and sealing the inner wall of the lap joint structure (3), the sealing layer comprises a sealing part (10) and a filling part (11), the sealing part (10) is arranged on the inner wall of the pipe body (2), and the filling part (11) is arranged on the outer side of the sealing part (10) and fills the gap between the lap joint block and the lap joint groove.

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