Novel bio-based bamboo winding composite pipeline

Abstract

The invention provides a novel bio-based bamboo winding composite pipeline which comprises an inner lining pipe, an outer lining pipe and a middle winding layer, and the winding layer is formed by cross winding of grid cloth strips and bamboo splits and is immersed in resin. The bamboo splits are renewable resources and are corrosion-resistant and durable. The grid cloth strip is provided with the flat parts and the convex edges, so that the contact area and the bonding force between the grid cloth strip and resin are increased. And the bamboo splits are tightly wound, so that the ribs are skewed and deformed, mechanical locking and friction locking effects are formed, and the overall strength and toughness of the pipeline are enhanced. Resin is used as a binder, fills gaps and is cured into an external protective layer, so that the corrosion resistance and the service life of the pipeline are improved. More channels are provided for resin infiltration through rollover of the ribs, the bonding force is enhanced, anchoring points are formed, and the structural strength of the pipeline is further improved. And the winding of the bamboo splits also forms a structure similar to prestress, so that the pipeline can better bear external force. The pipeline disclosed by the invention is environment-friendly, high in strength and corrosion-resistant, and is a sustainable high-performance pipeline material.

Description

Technical Field

[0001] The invention relates to the technical field of wound composite pipes, in particular to a novel bio-based bamboo wound composite pipe. Background Art

[0002] In today's society, with the acceleration of industrialization and the continuous improvement of urbanization, the demand for pipeline systems as an important part of infrastructure is increasing. Although traditional pipeline materials, such as metal pipes and plastic pipes, meet the use needs to a certain extent, they each have certain limitations. Although metal pipes have high strength and good pressure bearing capacity, they are susceptible to corrosion and have high maintenance costs; plastic pipes may have problems such as poor temperature resistance and easy aging. Therefore, it is particularly important to develop a new, environmentally friendly, high-performance pipeline material.

[0003] As a natural renewable resource, bamboo has the advantages of rapid growth, abundant resources, and green environmental protection. In recent years, it has been widely used in many fields. However, there are still certain technical difficulties in using bamboo directly for pipe manufacturing, such as bamboo's easy cracking and poor dimensional stability. Therefore, how to combine the excellent properties of bamboo with modern pipe technology to develop a new type of bio-based pipe material has become a hot topic in current research.

[0004] In addition, traditional composite pipes often have some problems in structural design, such as weak interlayer adhesion, poor impact resistance, insufficient corrosion resistance, etc. These problems not only affect the service life of the pipe, but also may threaten the safety during use. Therefore, there is an urgent need for a new composite pipe structure that can overcome the above defects and improve the overall performance of the pipe. Summary of the invention

[0005] The present invention proposes a new type of bio-based bamboo-wrapped composite pipe, which aims to combine the natural advantages of bamboo with modern composite material technology to develop a new type of pipe material with the characteristics of high strength, high toughness, corrosion resistance, and sustainable development to meet the needs of modern industrial and civil fields for high-performance pipes.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: a novel bio-based bamboo wound composite pipe, comprising an inner lining pipe, an outer lining pipe sleeved outside the inner lining pipe, and a winding layer wound between the inner lining pipe and the outer lining pipe, wherein the space between the inner lining pipe and the outer lining pipe is filled with resin, and the winding layer is completely immersed in the resin; The winding layer includes a mesh cloth strip wound outside the inner lining tube and bamboo strips wound outside the mesh cloth strip; The mesh fabric strip includes a flat portion and ridges located on both sides of the flat portion, and the thickness of the ridges is greater than the thickness of the flat portion; The mesh cloth strips are cross-wound with the bamboo strips, the bamboo strips are attached to the flat portion and squeeze the convex ridges, and the squeezed portion of the convex ridges is skewed and deformed in the direction of the bamboo strips being wound.

[0007] In some embodiments, the liner tube is made of thermoplastic.

[0008] In some embodiments, the outer liner is made of reinforced plastic.

[0009] In some embodiments, the mesh fabric strips are made of high-strength polyester fiber or aramid fiber.

[0010] In some embodiments, the resin has bio-based particles uniformly mixed therein.

[0011] In some embodiments, the mesh cloth strips are wound in a forward direction, and the bamboo strips are wound in an oblique direction.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The design of the mesh fabric strips of the present invention increases the contact area and bonding force with the resin, and the tight winding of the bamboo strips further enhances the overall strength of the pipeline. The presence of the ridges and the squeezing action of the bamboo strips form a mechanical locking and friction locking effect, making the layers more tightly combined and difficult to separate. This enhanced interlayer bonding force improves the tensile and compressive resistance of the pipeline, ensuring the stability of the pipeline during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the pipeline of the present invention; Figure 2 It is a schematic diagram of winding the mesh cloth strips of the pipeline of the present invention; Figure 3 for Figure 2 A magnified view of point A; Figure 4 A schematic diagram of winding bamboo strips of the pipeline of the present invention; Figure 5 It is a schematic diagram of winding the mesh cloth strips and bamboo strips of the pipeline of the present invention; Figure 6 It is an enlarged view of the contact area between the mesh cloth strips and the bamboo strips of the pipeline of the present invention.

[0014] In the figure: 1. inner lining tube; 2. mesh cloth strip; 201. flat portion; 202. convex ridge; 3. bamboo strips; 4. outer lining tube. DETAILED DESCRIPTION

[0015] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0016] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0017] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0018] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] See also Figure 1-6 This embodiment provides a novel bio-based bamboo wound composite pipe, comprising an inner lining pipe 1, an outer lining pipe 4 sleeved outside the inner lining pipe 1, and a winding layer wound between the inner lining pipe 1 and the outer lining pipe 4, wherein the space between the inner lining pipe 1 and the outer lining pipe 4 is filled with resin, and the winding layer is completely immersed in the resin; The winding layer includes a mesh cloth strip 2 wound around the inner liner 1 and bamboo strips 3 wound around the mesh cloth strip 2. The bamboo strips 3 are natural materials derived from a renewable resource, bamboo, which grows rapidly and is abundant in resources, meeting the requirements of sustainable development. The bamboo strips 3 also have good corrosion resistance and durability, and can effectively resist the erosion of various chemical substances. The resin, as a binder, not only fills the gap between the inner liner 1 and the outer liner 4, but also firmly bonds the mesh cloth strip 2 and the bamboo strips 3 together to form a strong and flexible composite, which significantly improves the toughness and impact resistance of the pipeline. The resin layer formed by the cured resin serves as an external protective layer, which isolates the direct contact between the internal fluid of the pipeline and the external environment, further improving the corrosion resistance and service life of the pipeline. The mesh cloth strip 2 includes a flat portion 201 and ridges 202 located on both sides of the flat portion 201, the thickness of the ridges 202 is greater than the thickness of the flat portion 201, the mesh cloth strip 2 is cross-wound with the bamboo strips 3, the bamboo strips 3 fit the flat portion 201 and squeeze the ridges 202, and the squeezed portion of the ridges 202 is skewed and deformed in the direction of the winding of the bamboo strips 3. The mesh cloth strip 2 serves as a base layer, and the design of its flat portion 201 and the ridges 202 increases the contact area and bonding force with the resin. At the same time, the tight winding of the bamboo strips 3 further enhances the overall strength of the pipeline. At the same time, the ridges 202 are squeezed and skewed by the bamboo strips 3, forming a mechanical locking effect, thereby improving the tensile and compressive resistance of the pipeline.

[0020] The presence of the ridges 202 on the mesh cloth strip 2 increases the contact area between the mesh cloth strip 2 and the bamboo strips 3, provides more space for the penetration and curing of the resin, enhances the bonding force, and when the pipe is stretched or compressed, the ridges 202, as stress concentration points, can more effectively disperse and transfer stress, avoiding excessive concentration of stress in a certain part and causing material damage. When the bamboo strips 3 are tightly wrapped around the mesh cloth strip 2, they will exert an extrusion effect on the ridges 202. The extrusion of the bamboo strips 3 applies a pre-tightening force to the pipe. This force can resist part of the stress in advance when the pipe is subjected to external loads, thereby improving the bearing capacity of the pipe. In addition, the skewed deformation of the ridges 202 increases the friction between the bamboo strips 3 and form a friction locking effect. This locking effect makes the bamboo strips 3 and the mesh cloth strip 2 more closely combined together and difficult to separate. Moreover, when the bamboo strips 3 are wrapped around and squeeze the ridges 202 on the mesh cloth strip 2, the ridges 202 will be skewed and deformed, or even partially overturned. This deformation breaks the originally smooth surface and creates more channels and gaps for the infiltration of resin. The resin can penetrate into the tiny gaps between the mesh cloth strips 2 and the bamboo strips 3 along these channels to form a more solid bond, and the rollover of the ridge 202 increases the contact area with the resin. Originally, only the top of the ridge 202 may be in direct contact with the resin, but after the rollover, the side of the ridge 202 is also exposed, forming a wider contact with the resin. This increased contact area helps the resin to be more evenly distributed and enhances the bonding force between the mesh cloth strips 2 and the bamboo strips 3. After the resin is infiltrated and solidified, it will form anchor points at the rollover part of the ridge 202. These anchor points tightly connect the resin, mesh cloth strips 2 and bamboo strips 3 together like wedges. When the pipeline is subjected to external force, these anchor points can effectively resist the transmission of stress and prevent separation between the parts, thereby improving the overall strength of the pipeline. Therefore, the retention and solidification of the resin at the rollover part of the ridge 202 form a more solid and durable structure. This structure can not only resist the erosion of the external environment, such as corrosion by chemicals, penetration of water, etc., but also withstand long-term use and wear, extending the service life of the pipeline.

[0021] In general, the flat part 201 of the mesh cloth strip 2 provides a base surface that is fully in contact with the resin, ensuring that the resin can be uniformly infiltrated and solidified to form a strong bonding layer. The design of the ridge 202 increases the contact point and friction between the bamboo strips 3. When the bamboo strips 3 are wrapped and squeezed with the ridge 202, the ridge 202 is skewed and deformed. This deformation not only increases the locking force between the bamboo strips 3 and the mesh cloth strip 2, but also enables the resin to better fill and lock these tiny gaps during the curing process, thereby enhancing the overall structural strength of the pipeline. As a natural high-strength material, the bamboo strips 3, whose tight winding method not only provides additional strength support for the pipeline, but also forms a structure similar to "prestressed" by squeezing the ridge 202 of the mesh cloth strip 2, so that the pipeline can better disperse and withstand pressure when subjected to external forces, thereby improving the compressive resistance and toughness of the pipeline. In addition, the resin is used as a binder and a protective layer, and its filling process ensures that the gap inside the pipeline is completely filled, avoiding structural weaknesses caused by the existence of gaps. The hard and flexible material formed by the resin during the curing process not only enhances the overall strength of the pipe, but also provides good corrosion resistance and durability.

[0022] In some embodiments, the material of the inner liner pipe 1 is thermoplastic, including but not limited to high-density polyethylene (HDPE) or polypropylene (PP). Both HDPE and PP materials have excellent chemical corrosion resistance and can resist the erosion of various acids, alkalis, salts and other chemical substances, thereby ensuring the purity of the fluid inside the pipeline and the long-term stable operation of the pipeline. This feature is particularly important for pipelines that transport corrosive fluids or are used in corrosive environments. In addition, HDPE and PP materials have high tensile strength, elongation at break and impact resistance, which enables the inner liner pipe 1 to withstand large internal pressure and external forces, and is not prone to rupture or deformation. At the same time, these materials also have good flexibility and plasticity, which facilitates the processing and installation of pipelines. In addition, thermoplastic materials such as HDPE and PP have a low friction coefficient and good wear resistance, which can reduce the resistance of the fluid when it flows in the pipeline, reduce energy consumption, and extend the service life of the pipeline. This is particularly important for pipeline systems that need to transport fluids for a long time or contain solid particles in the fluid.

[0023] In some embodiments, the outer liner 4 is made of reinforced plastic, including but not limited to glass fiber reinforced plastic (GFRP) or carbon fiber reinforced plastic (CFRP). Both GFRP and CFRP are composite materials. Through the composite of glass fiber or carbon fiber and resin matrix, a structural material with high strength and rigidity is formed. These materials can withstand large external loads, provide excellent compression, bending and torsion resistance for the pipeline, and ensure the stability and safety of the pipeline in complex environments. Compared with traditional metal materials, GFRP and CFRP have lower density, so that the outer liner 4 can achieve lightweight design while ensuring strength. This helps to reduce the overall weight of the pipeline, facilitate transportation, installation and maintenance, especially in situations where long-distance laying or high-altitude operations are required, lightweight design is particularly important. Moreover, both GFRP and CFRP have good corrosion resistance and can resist corrosion from a variety of chemical substances, including acids, alkalis, salts, etc. This feature enables the outer liner 4 to be used for a long time in harsh chemical environments, protect the internal structure of the pipeline from damage, and extend the service life of the pipeline. In addition, GFRP and CFRP can maintain stable physical and chemical properties over a wide temperature range, and are not prone to material aging or performance degradation due to temperature changes or ultraviolet radiation. This enables the pipe to be used for a long time in different climatic conditions and maintain its excellent performance.

[0024] In some embodiments, the mesh strip 2 is made of high-strength polyester fiber or aramid fiber. Both high-strength polyester fiber and aramid fiber have extremely high tensile strength, which enables the mesh strip 2 to withstand large tensile forces and is not easy to break or deform. When the pipeline is subjected to external tensile force, the mesh strip 2 can effectively disperse and transfer stress, maintain the overall structural stability of the pipeline, and prevent damage caused by excessive local stress. Moreover, both fiber materials have excellent wear resistance and durability, and can resist wear and aging during long-term use. Especially in the case where the fluid contains solid particles or the pipeline needs to withstand mechanical friction frequently, the wear resistance of high-strength polyester fiber and aramid fiber is particularly important, which can extend the service life of the pipeline and reduce the frequency of maintenance and replacement. Compared with metal materials, the density of high-strength polyester fiber and aramid fiber is lower, making the mesh strip 2 lighter. This not only helps to reduce the overall weight of the pipeline, facilitates transportation and installation, but also achieves lightweight design of the pipeline while maintaining strength, which is particularly important for pipeline systems that need to be laid over long distances or work at high altitudes. In addition, the surface properties of high-strength polyester fibers and aramid fibers make them have good compatibility and adhesion with the resin. During the resin filling and curing process, the fibers can be closely combined with the resin to form a strong and flexible composite. This enhanced adhesion not only improves the overall strength of the pipeline, but also enables the pipeline to better disperse and withstand pressure when subjected to external forces.

[0025] In some embodiments, bio-based particles are uniformly mixed in the resin. Bio-based particles are usually derived from renewable resources, such as plant starch, lignin, microbial fermentation products, etc. Their use reduces dependence on fossil resources, reduces carbon emissions, and conforms to the concept of green, low-carbon, and sustainable development. This environmentally friendly resin not only reduces environmental pollution during the production process, but also after the pipeline is abandoned, the bio-based particles can be partially degraded naturally, reducing the long-term impact on the environment. Moreover, the addition of bio-based particles can significantly improve certain physical and chemical properties of the resin. For example, they may enhance the toughness, impact resistance, heat resistance, or chemical corrosion resistance of the resin. The improvement of these properties enables the pipeline to better adapt to the complex and changeable use environment, extend the service life, and reduce the frequency of maintenance and replacement. In addition, the mixing of bio-based particles can improve the processing properties of the resin, such as reducing the viscosity of the resin, improving the fluidity, making the resin more uniform during the filling and curing process, and reducing the generation of bubbles and defects. This not only improves the production efficiency of the pipeline, but also ensures the stability and consistency of the pipeline quality. The bio-based particles can also form a good interaction between the resin and the fiber material, further enhancing the bonding force between the resin and the mesh cloth strips 2 and the bamboo strips 3. This enhanced bonding force allows the various parts of the pipeline to be more closely combined when subjected to external forces, jointly resisting the transfer of stress and improving the overall strength of the pipeline.

[0026] In some embodiments, Figure 1As shown in Figure 5, the mesh strips 2 are forwardly wound and the bamboo strips 3 are obliquely wound. The forwardly wound mesh strips 2 provide a uniform and continuous support base for the pipeline, ensuring the stability of the pipeline in the axial direction. The obliquely wound bamboo strips 3 form a cross-locking structure with the mesh strips 2. This intersection not only increases the overall strength of the pipeline, but also improves its ability to resist torsion and lateral forces. When the pipeline is subjected to external loads, the obliquely wound bamboo strips 3 can effectively disperse and transfer stress to prevent the pipeline from being damaged due to excessive local stress. And the forward and oblique cross-winding method enables the pipeline to form a tighter and more uniform stress distribution network when it is under pressure. This distribution method not only improves the carrying capacity of the pipeline, but also enables it to better adapt to complex and changeable use environments. When the pipeline is subjected to axial tension, the obliquely wound bamboo strips 3 can play an additional supporting role like a "stayed cable", further enhancing the tensile strength of the pipeline. In addition, more contact points and intersections are formed between the obliquely wound bamboo strips 3 and the forwardly wound mesh cloth strips 2, which are key areas for resin penetration and curing. Therefore, this winding method increases the bonding area and bonding force between the resin and the fiber material. The resin can fill these intersections more evenly during the curing process to form a more solid bonding layer, thereby improving the overall strength and durability of the pipeline. And the obliquely wound bamboo strips 3 form a patchwork arrangement on the mesh cloth strips 2, which provides more channels and gaps for the penetration and curing of the resin. The resin can penetrate deeper into the fiber materials along these channels to form a more compact and uniform bonding layer. The shrinkage and expansion of the resin during the curing process will also be more uniform, reducing the internal stress concentration and deformation problems of the pipeline caused by uneven resin curing.

[0027] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A novel bio-based bamboo-wrapped composite pipe, characterized in that: It comprises an inner lining tube (1), an outer lining tube (4) sleeved outside the inner lining tube (1), and a winding layer wound between the inner lining tube (1) and the outer lining tube (4), wherein the space between the inner lining tube (1) and the outer lining tube (4) is filled with resin, and the winding layer is completely immersed in the resin; The winding layer comprises a mesh cloth strip (2) wound around the outside of the inner lining tube (1), and bamboo strips (3) wound around the outside of the mesh cloth strip (2); The mesh cloth strip (2) comprises a flat portion (201) and ridges (202) located on both sides of the flat portion (201), and the thickness of the ridges (202) is greater than the thickness of the flat portion (201); The mesh cloth strips (2) are cross-wound with the bamboo strips (3); the bamboo strips (3) fit the flat portion (201) and press the convex ridges (202); the pressed portion of the convex ridges (202) is skewed and deformed in the direction of the winding of the bamboo strips (3).

2. The novel bio-based bamboo-wrapped composite pipe according to claim 1 is characterized in that: The material of the inner liner tube (1) is thermoplastic plastic.

3. The novel bio-based bamboo-wrapped composite pipe according to claim 1 is characterized in that: The material of the outer lining tube (4) is reinforced plastic.

4. The novel bio-based bamboo-wrapped composite pipe according to claim 1 is characterized in that: The mesh cloth strips (2) are made of high-strength polyester fibers or aramid fibers.

5. The novel bio-based bamboo-wrapped composite pipe according to claim 1 is characterized by: The resin has bio-based particles uniformly mixed therein.

6. The novel bio-based bamboo-wrapped composite pipe according to claim 1 is characterized by: The mesh cloth strips (2) are wound in a forward direction, and the bamboo strips (3) are wound in an oblique direction.

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