A multi-layer composite plastic pipe

Abstract

The utility model discloses a kind of multilayer composite plastic pipe, belong to plastic pipe technical field, and plastic pipe includes central reinforcing layer, twisted functional layer, intermediate filling layer, antioxidant barrier layer and outer sheath;The twisted functional layer is spirally twisted around the central reinforcing layer, the intermediate filling layer is filled in the gap of the twisted functional layer, the antioxidant barrier layer is covered on the outside of the twisted functional layer, and the outer sheath is wrapped outside the antioxidant barrier layer.The utility model uses above-mentioned one kind of multilayer composite plastic pipe, and through layered structure design and function integration, solve the shortage of traditional pipeline in mechanical property and environmental adaptability, meet the stringent requirement of high-end scene to pipeline reliability.

Description

Technical Field

[0001] This utility model belongs to the field of plastic pipe technology, specifically relating to a multi-layer composite plastic pipe. Background Technology

[0002] As a core material for modern fluid transportation, the performance of plastic pipes directly affects the quality and service life of projects. Traditional plastic pipes are mainly divided into two types: single-layer solid-wall pipes and simple composite pipes.

[0003] Traditional pipelines often have a simple structure, and a single-layer pipe wall cannot simultaneously meet the requirements of high pressure resistance, corrosion resistance and deformation resistance. For example, they are prone to cracking or leakage in the transportation of high-pressure chemical fluids, which reduces the service life of the pipeline. Traditional socket or adhesive joints are prone to failure in complex environments (such as sudden temperature changes and foundation settlement), which can lead to the overall paralysis of the pipeline system. When producing large-diameter pipelines, traditional extrusion processes cannot guarantee the uniformity of wall thickness.

[0004] Therefore, there is an urgent need to develop a new type of plastic pipe. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-layer composite plastic pipe. This pipe, through its layered structural design and functional integration, solves the shortcomings of traditional pipes in terms of mechanical performance and environmental adaptability, and meets the stringent requirements for pipe reliability in high-end scenarios.

[0006] To achieve the above objectives, this utility model provides a multi-layer composite plastic pipe, which includes a central reinforcing layer, a twisted functional layer, an intermediate filling layer, an anti-oxidation barrier layer, and an outer sheath. The stranded functional layer is spirally stranded around the central reinforcing layer, the intermediate filling layer fills the gaps between the stranded functional layers, the antioxidant barrier layer covers the outside of the stranded functional layer, and the outer sheath wraps around the outside of the antioxidant barrier layer.

[0007] Preferably, the central reinforcing layer is a fiber-reinforced thermoplastic composite material with a fiber content of 20%-40% and a ring stiffness ≥SN8.

[0008] Preferably, the stranded functional layer comprises at least one composite tape, which is composed of a polymer base tape and a conductive element. The inner layer of the composite tape is stranded in the opposite direction to the outer layer of the composite tape, the stranding angle is 15°-30°, and the pitch is 3-5 times the width of the composite tape.

[0009] Preferably, the conductive element is a metal wire, carbon fiber, or graphene composite tape.

[0010] Preferably, the intermediate filler layer is an elastomer material with a fill rate of 20%-50%.

[0011] Preferably, the antioxidant barrier layer is a nano-ceramic or metal composite coating with a thickness of 5-20 μm.

[0012] Preferably, the outer sheath is made of weather-resistant polymer material, with anti-slip texture on the surface. The height of the anti-slip texture is 0.3-1.5mm and the spacing is 10-50mm.

[0013] Preferably, the plastic pipe is provided with electrofusion interfaces at both ends, and the electrofusion interfaces have built-in shape memory alloy retaining rings with a phase change temperature of 50℃-70℃.

[0014] Therefore, compared with the prior art, the present invention, which adopts the above-mentioned multi-layer composite plastic pipe, has the following significant advantages: (1) This utility model improves the ring stiffness and torsional strength through the central reinforcing layer and the reverse twisted structure, and is suitable for high pressure and high shear force environment; (2) The nano-ceramic barrier layer and weather-resistant sheath of this utility model extend the service life of the pipeline.

[0015] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a multi-layer composite plastic pipe according to the present invention.

[0017] Figure Labels 1. Stranded functional layer; 2. Central reinforcement layer; 3. Intermediate filler layer; 4. Antioxidant barrier layer; 5. Outer sheath. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by those skilled in the art.

[0019] Example 1 like Figure 1 As shown, this utility model discloses a multi-layer composite plastic pipe, which includes a central reinforcing layer 2, a twisted functional layer 1, an intermediate filling layer 3, an anti-oxidation barrier layer 4, and an outer sheath 5. The stranded functional layer 1 is spirally stranded around the central reinforcing layer 2. The stranded functional layer 1 comprises 1-3 layers of functional composite tape, each composed of a polyethylene (PE) base tape and embedded conductive elements. The inner and outer layers are stranded in opposite directions, with a stranding angle of 15°-30°, a pitch 3-5 times the width of the composite tape, and a conductive wire spacing of 5-10 mm. This layer is used for real-time monitoring of internal pressure / temperature signals in the pipeline. The conductive elements include metal wires, carbon fibers, or graphene composite tapes with a spacing ≤10 mm. The central reinforcing layer 2 uses glass fiber reinforced polypropylene (GF-PP), with a diameter accounting for 20%-30% of the total pipe wall thickness, providing basic structural strength. The fiber content is 20%-40%, and the ring stiffness is ≥SN8.

[0020] The intermediate filling layer 3 fills the gap between the stranded functional layers 1. The intermediate filling layer 3 is a modified polyurethane elastomer with a filling rate of 20%-50% and a Shore hardness of A40-A80. It is used to absorb vibration energy and buffer external impacts.

[0021] An antioxidant barrier layer 4 covers the outside of the stranded functional layer 1. The antioxidant barrier layer 4 is a nano-ceramic or metal composite coating with a thickness of 5-20 μm, which is used to prevent corrosive media from penetrating into the internal structural layer.

[0022] The outer sheath 5 is wrapped around the anti-oxidation barrier layer 4. The outer sheath 5 is made of weather-resistant polymer material, specifically weather-resistant polyvinyl chloride (PVC-U), with a thickness of 2-3 mm. The surface of the outer sheath 5 is provided with anti-slip textures, with a height of 0.3-1.5 mm and a spacing of 10-50 mm.

[0023] The plastic pipe is equipped with electrofusion joints at both ends. The electrofusion joints have built-in shape memory alloy retaining rings with a phase change temperature of 50℃-70℃ and an absolute radial expansion of 0.5-2mm.

[0024] Example 2 The central reinforcing layer 2 is made of GF-PP composite material (30% glass fiber content), which is extruded into a solid mandrel with a diameter of 50mm. The ring stiffness test value reaches SN16, which meets the requirements of high-pressure scenarios with a burial depth of 8 meters.

[0025] The inner layer of the stranded functional layer 1 consists of six PE base tapes (10mm wide and 0.5mm thick) spirally twisted in a right direction (at an angle of 20°), with each base tape embedding a copper-nickel alloy conductive wire with a diameter of 0.2mm. The outer layer of the stranded functional layer 1 consists of twelve PE base tapes spirally twisted in a left direction (at an angle of 25°), with a carbon fiber conductive wire embedded in a diameter of 0.1mm. The twisting pitch is four times the width of the base tape (40mm). Reverse twisting is achieved using a biaxial stranding machine, with tension controlled at 80-100N to ensure uniform distribution of the conductive wires without breakage.

[0026] The intermediate filler layer 3 is made of polyurethane elastomer (Shore hardness A60), which is filled into the gap of the stranded layer by high pressure injection with a filling rate of 40%. After curing, it forms a buffer energy absorption structure.

[0027] The antioxidant barrier layer 4 is coated with a nano-alumina ceramic layer by plasma spraying process. The thickness is 15μm and the surface roughness is ≤3μm, which effectively blocks strong corrosive media such as hydrochloric acid and sodium hydroxide.

[0028] The outer sheath 5 is made of PVC-U granules (5% weather-resistant agent content), which are wrapped by a vacuum sizing extruder. The sheath is 2.5mm thick, and the annular anti-slip texture on the surface is directly formed by a mold.

[0029] Both ends of the pipe are machined with socket-type electrofusion joints, with built-in nickel-titanium shape memory alloy retaining rings with a thickness of 0.8mm (phase change temperature 55℃). The conductive wire of the joint is welded to the conductive wire of the pipe stranded layer.

[0030] Therefore, this utility model adopts the above-mentioned multi-layer composite plastic pipe, which solves the shortcomings of traditional pipes in terms of mechanical performance and environmental adaptability through layered structural design and functional integration, and meets the stringent requirements of high-end scenarios for pipe reliability.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A multi-layer composite plastic pipe, characterized in that, Plastic pipes consist of a central reinforcing layer, a twisted functional layer, an intermediate filling layer, an antioxidant barrier layer, and an outer sheath. The stranded functional layer is spirally stranded around the central reinforcing layer, the intermediate filling layer fills the gaps between the stranded functional layers, the antioxidant barrier layer covers the outside of the stranded functional layer, and the outer sheath wraps around the outside of the antioxidant barrier layer.

2. The multi-layer composite plastic pipe according to claim 1, characterized in that, The central reinforcing layer is a fiber-reinforced thermoplastic composite material with a fiber content of 20%-40% and a ring stiffness ≥SN8.

3. A multi-layer composite plastic pipe according to claim 2, characterized in that, The stranded functional layer includes at least one composite tape, which is composed of a polymer base tape and a conductive element. The inner layer of the composite tape is stranded in the opposite direction to the outer layer of the composite tape, the stranding angle is 15°-30°, and the pitch is 3-5 times the width of the composite tape.

4. A multi-layer composite plastic pipe according to claim 3, characterized in that, The conductive element is a metal wire, carbon fiber, or graphene composite tape.

5. A multi-layer composite plastic pipe according to claim 4, characterized in that, The intermediate filler layer is an elastomer material with a fill rate of 20%-50%.

6. A multi-layer composite plastic pipe according to claim 5, characterized in that, The antioxidant barrier layer is a nano-ceramic or metal composite coating with a thickness of 5-20 μm.

7. A multi-layer composite plastic pipe according to claim 6, characterized in that, The outer sheath is made of weather-resistant polymer material, with anti-slip textures on the surface. The height of the anti-slip textures is 0.3-1.5mm, and the spacing is 10-50mm.

8. A multi-layer composite plastic pipe according to claim 7, characterized in that, The plastic pipe is equipped with electrofusion interfaces at both ends, and the electrofusion interfaces have built-in shape memory alloy retaining rings with a phase change temperature of 50℃-70℃.

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