Carbon fiber reinforced high temperature resistant PVC pipe

Abstract

The utility model relates to pipeline technical field especially relates to a kind of carbon fiber reinforced high temperature resistant PVC pipe.Its technical scheme includes: pipe body, the pipe body is by outer protective layer, carbon fiber reinforced layer, blending transition layer, PVC layer and high temperature resistant fluorination coating composition, outer protective layer, carbon fiber reinforced layer, blending transition layer, PVC layer and high temperature resistant fluorination coating are sequentially arranged from outside to inside, the blending transition layer is by short-cut carbon fiber and PVC base material blending composition, the mass fraction of short-cut carbon fiber in the blending transition layer is gradient increasing along the radial outward direction, the both ends of the pipe body are embedded with metal connecting screw head, metal connecting screw tail, the carbon fiber reinforced layer is coated in the outer periphery of the metal connecting screw head, metal connecting screw tail.The utility model is by multilayer composite and gradient reinforcement design, realizes the efficient combination of carbon fiber and PVC matrix, so that pipe body has high temperature stability, oxidation resistance and structural strength.

Description

Technical Field

[0001] This utility model relates to the field of pipeline technology, and in particular to a carbon fiber reinforced high-temperature resistant PVC pipe. Background Technology

[0002] Polyvinyl chloride (PVC) pipes are widely used in fluid transportation, electrical conduit, and other fields due to their low cost, good corrosion resistance, and ease of processing. However, ordinary PVC pipes have poor heat resistance, with a long-term operating temperature typically not exceeding 60°C and a low heat distortion temperature, which severely limits their application in high-temperature conditions (such as industrial hot water, chemical media transportation, and automotive engine compartments).

[0003] To improve the temperature resistance of PVC pipes, existing technologies typically employ the following methods: Adding heat stabilizers, inorganic fillers, or blending with other heat-resistant polymers to the PVC matrix can improve temperature resistance to a limited extent, and often sacrifices the material's flexibility, impact strength, and other mechanical properties. Reinforcing pipes with glass fiber or carbon fiber can lead to pipe failure due to the significant differences in the physical and chemical properties between the reinforcing fibers and the PVC matrix, resulting in weak interfacial bonding. Under conditions of high temperature, high pressure, or thermal cycling, interlayer delamination can easily occur.

[0004] Therefore, we propose a carbon fiber reinforced high-temperature resistant PVC pipe to solve the existing problems. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the background technology by proposing a carbon fiber reinforced high-temperature resistant PVC pipe.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a carbon fiber reinforced high-temperature resistant PVC pipe, comprising a pipe body, wherein the pipe body is composed of an outer protective layer, a carbon fiber reinforcement layer, a blended transition layer, a PVC layer and a high-temperature resistant fluorinated coating, wherein the outer protective layer, the carbon fiber reinforcement layer, the blended transition layer, the PVC layer and the high-temperature resistant fluorinated coating are arranged sequentially from the outside to the inside. The blended transition layer is composed of a blend of short-cut carbon fibers and PVC substrate. The mass fraction of short-cut carbon fibers in the blended transition layer increases gradually in the radial outward direction, while the mass fraction of PVC substrate decreases gradually in the radial outward direction. The two ends of the tube are pre-embedded with metal connecting screw heads and metal connecting screw tails, and the carbon fiber reinforcement layer covers the outer periphery of the metal connecting screw heads and metal connecting screw tails.

[0007] Preferably, the interface between the PVC layer and the blended transition layer and the interface between the blended transition layer and the carbon fiber reinforcement layer are both provided with a textured surface.

[0008] Preferably, the outer protective layer has equidistant slow-release grooves, the slow-release grooves have an arc-shaped transition, and the outer protective layer is made of a blend of polyvinyl chloride and polyvinylidene fluoride.

[0009] Preferably, the embedded end shaft surfaces of the metal connecting screw head and the metal connecting screw tail are both fixedly provided with protrusions at equal intervals.

[0010] Preferably, the carbon fiber reinforcement layer is composed of continuous carbon fibers impregnated with thermosetting resin, and the high-temperature resistant fluorinated coating is formed by spraying polytetrafluoroethylene material.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: The tube body of this utility model includes, from the outside to the inside, an outer protective layer, a carbon fiber reinforcement layer, a blended transition layer, a PVC layer, and a high-temperature resistant fluorinated coating. Through the synergistic effect of multiple layers, structural stability is achieved in high-temperature environments. The outer protective layer provides excellent anti-oxidation and anti-ultraviolet properties, and the innermost polytetrafluoroethylene coating can form a smooth and corrosion-resistant interface, which not only prevents high-temperature gases or chemical media from corroding the PVC layer, but also reduces fluid friction resistance and improves conveying efficiency. The blended transition layer is formed by blending short-cut carbon fibers with PVC substrate. The content of short-cut carbon fibers gradually increases radially outward, creating a fiber content gradient distribution within the transition layer. This not only improves the interlayer bonding strength but also ensures flexibility and crack resistance, solving the problem of easy delamination in traditional reinforcement layers. The carbon fiber reinforcement layer is made of continuous carbon fiber impregnated with thermosetting resin. It has excellent high temperature resistance, tensile strength and creep resistance. It can effectively withstand the stress caused by high temperature fluid or mechanical load, and improve the overall pressure resistance and deformation resistance. The outer protective layer is made of polyvinyl chloride and polyvinylidene fluoride blend. Arc-shaped slow-release grooves are equidistantly arranged along the axial direction on the surface of the layer. Under temperature changes or external force, micro-stress can be released to prevent surface stress concentration and cracking. At the same time, the slow-release grooves increase the heat dissipation area and further improve the heat aging resistance. Metal connecting screw heads and tails are pre-embedded at both ends of the tube body, and the outer periphery is covered by a carbon fiber reinforcement layer. Equidistant protrusions are set on the surface of the pre-embedded end, which can form a mechanical lock with the tube body during molding, improve the end pull-out resistance, and ensure reliable connection under high pressure and high temperature environment. This invention achieves efficient bonding between carbon fiber and PVC matrix through multi-layer composite and gradient reinforcement design, giving the pipe body high-temperature stability, oxidation resistance and structural strength, making it suitable for long-term safe transportation in high-temperature, outdoor and corrosive environments. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the layered structure of this utility model; Figure 3 This is a schematic diagram of the metal connecting screw head structure of this utility model; Figure 4 This is a schematic diagram of the metal connecting screw tail structure of this utility model.

[0013] Figure label: 1. Tube body; 101. Outer protective layer; 102. Carbon fiber reinforcement layer; 103. Blended transition layer; 104. PVC layer; 105. High-temperature resistant fluorinated coating; 106. Slow-release groove; 2. Metal connecting screw head; 3. Metal connecting screw tail; 4. Protrusion. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Example 1

[0016] like Figures 1-4 As shown, the present invention proposes a carbon fiber reinforced high-temperature resistant PVC pipe, including a pipe body 1. The pipe body 1 is composed of an outer protective layer 101, a carbon fiber reinforcement layer 102, a blended transition layer 103, a PVC layer 104, and a high-temperature resistant fluorinated coating 105, arranged from the outside to the inside. First, a high-temperature resistant PVC layer 104 with a textured surface is formed by extrusion. Then, a blended transition layer 103 with a textured surface is formed on the outside of the PVC layer 104 by co-extrusion. The textured surface increases the interlayer contact area and enhances the mechanical interlocking effect. Next, the metal connector with protrusion 4 is pre-installed, and then carbon fiber is wound and cured on the outside of the blended transition layer 103 to form a carbon fiber reinforcement layer 102. The carbon fiber reinforcement layer 102 extends to the outer periphery of the metal connector head 2 and the metal connector tail 3 during the molding process. Then, an outer protective layer 101 with a slow-release groove 106 is formed by co-extrusion. Finally, a high-temperature resistant fluorinated coating 105 is sprayed on the inner wall of the PVC layer 104.

[0017] Example 2

[0018] like Figures 1-4As shown, the present invention proposes a carbon fiber reinforced high-temperature resistant PVC pipe. Compared with Embodiment 1, this embodiment further includes: an outer protective layer 101 made of polyvinyl chloride and polyvinylidene fluoride blended together, which is extruded and coated on the outer surface of the carbon fiber reinforced layer 102. The outer protective layer 101 forms several arc-shaped slow-release grooves 106 at intervals along the axial direction. The slow-release grooves 106 are used to release surface stress when thermally expanded and contracted or deformed by external force, to prevent cracking of the outer layer, and at the same time increase the heat dissipation area to delay thermal aging.

[0019] The carbon fiber reinforcement layer 102 is formed by continuously impregnating thermosetting resin with carbon fibers and then winding and curing it. It is arranged alternately in the circumferential and axial directions and is tightly wrapped and bonded with the outer protective layer 101, providing the tube body 1 with high strength and high temperature load-bearing capacity. The inner surface of the carbon fiber reinforcement layer 102 is fused and bonded with the blended transition layer 103 to form a stable structural transition.

[0020] The blended transition layer 103 is formed by blending short carbon fibers and PVC substrate. The content of short carbon fibers increases radially outward, while the content of PVC substrate decreases radially outward. Through this gradient distribution design, the blended transition layer 103 maintains flexibility on the side near the PVC layer 104 and strengthens the bonding strength on the side near the carbon fiber reinforcement layer 102, thereby avoiding interlayer delamination under high temperature and stress.

[0021] The PVC layer 104 is integrally formed with the blended transition layer 103 through a hot extrusion process, forming the main pressure-bearing inner layer of the pipe body 1. The PVC layer 104 has good impact resistance and chemical resistance, and can maintain structural stability even in high-temperature environments.

[0022] The high-temperature resistant fluorinated coating 105 is uniformly applied to the inner surface of the PVC layer 104 by spraying. The material is polytetrafluoroethylene. The high-temperature resistant fluorinated coating 105 forms a dense protective interface with excellent heat resistance, corrosion resistance and low friction properties. It can effectively isolate the thermal impact of high-temperature fluid on the PVC layer 104 and reduce fluid transport resistance.

[0023] Metal connecting screw head 2 and metal connecting screw tail 3 are respectively embedded at both ends of the tube body 1. Protrusions 4 are equidistantly arranged on the outer surface of the pre-embedded ends of the metal connecting screw head 2 and metal connecting screw tail 3. During the molding process, the protrusions 4 are fused and locked with the tube body 1, so that the end metal parts and the tube body 1 form a mechanical bond, preventing them from falling off or leaking under high pressure or high temperature conditions. The carbon fiber reinforcement layer 102 extends to the outer periphery of the metal connecting screw head 2 and metal connecting screw tail 3 during the molding process, realizing the overall curing of the metal parts and the reinforcement layer, and improving the end connection strength.

[0024] This embodiment uses a multi-layer composite and gradient reinforcement structure design to form a continuous and dense composite system consisting of an outer protective layer 101, a carbon fiber reinforcement layer 102, a blended transition layer 103, a PVC layer 104, and a high-temperature resistant fluorinated coating 105. This system has both high-temperature stability and mechanical strength, as well as oxidation resistance and aging resistance, and can be used for long-term applications in the transportation of high-temperature gases or corrosive media.

[0025] The above specific embodiments are merely several preferred embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

[0026] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A carbon fiber reinforced high-temperature resistant PVC pipe, comprising a pipe body (1), characterized in that: The tube body (1) is composed of an outer protective layer (101), a carbon fiber reinforcement layer (102), a blended transition layer (103), a PVC layer (104), and a high-temperature fluorinated coating (105), which are arranged sequentially from the outside to the inside. The blended transition layer (103) is composed of short-cut carbon fibers and PVC substrate. The mass fraction of short-cut carbon fibers in the blended transition layer (103) increases gradually in the radial outward direction, and the mass fraction of PVC substrate decreases gradually in the radial outward direction. The tube body (1) has metal connecting screw heads (2) and metal connecting screw tails (3) pre-embedded at both ends, and the carbon fiber reinforcement layer (102) covers the outer periphery of the metal connecting screw heads (2) and metal connecting screw tails (3).

2. The carbon fiber reinforced high-temperature resistant PVC pipe according to claim 1, characterized in that: The interface between the PVC layer (104) and the blended transition layer (103) and the interface between the blended transition layer (103) and the carbon fiber reinforcement layer (102) are both provided with textured surfaces.

3. The carbon fiber reinforced high-temperature resistant PVC pipe according to claim 1, characterized in that: The outer protective layer (101) has equidistantly spaced slow-release grooves (106), which are arc-shaped transitions. The outer protective layer (101) is made of a blend of polyvinyl chloride and polyvinylidene fluoride.

4. The carbon fiber reinforced high-temperature resistant PVC pipe according to claim 1, characterized in that: The embedded end shaft surfaces of the metal connecting screw head (2) and the metal connecting screw tail (3) are both fixedly provided with protrusions (4) at equal intervals.

5. The carbon fiber reinforced high-temperature resistant PVC pipe according to claim 1, characterized in that: The carbon fiber reinforcement layer (102) is composed of continuous carbon fibers impregnated with thermosetting resin, and the high-temperature resistant fluorinated coating (105) is formed by spraying polytetrafluoroethylene material.

Images