FRPE multi-layer reinforced composite structure wall pipe

Abstract

The present invention relates to an FRPE multi-layer reinforced composite structure wall pipe, which solves the defect that existing double-wall corrugated pipes are all made of HDPE material and have a high cost. It is formed by helically winding a winding unit and bonding adjacent sides to form a structure with a double-layer wall and vertical ribs. The winding unit adopts a multi-layer co-extrusion composite method to form a multi-layer structure including a circumferentially closed intermediate pipe made of PP, a circumferentially closed inner pipe made of PE on the inner surface of the circumferentially closed intermediate pipe, and a circumferentially closed outer pipe made of PE on the outer surface of the circumferentially closed intermediate pipe. The winding unit has at least two hollow cavities, and at least one of the hollow cavities belongs to the circumferentially closed intermediate pipe made of PP. The PE material protects the PP material to avoid damage to the PP material by ultraviolet rays, thereby extending the service life of the structure wall pipe. At the same time, the circumferentially closed inner pipe made of PP has better strength than the circumferentially closed outer pipe made of PE, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to a wound pipe structure, in particular to an FRPE multi-layer reinforced composite structure wall pipe. Background Art

[0002] A corrugated pipe is a new type of pipe with a ring-shaped outer wall and a smooth inner wall. A wound corrugated pipe is a pipe with unlimited length obtained by continuous winding. It is mostly a new type of lightweight pipe made of high-density polyethylene (HDPE). The outer wall has a ring-shaped corrugated structure, which greatly enhances the ring stiffness of the pipe, thereby enhancing the pipe's resistance to soil load. It has the characteristics of light weight, high pressure resistance, good toughness, and fast construction, and is used to replace concrete pipes and cast iron pipes.

[0003] However, due to the limitations of material properties, at present, both the outer wall and the inner wall of the wound corrugated pipe are made of PE material. The price of PE material is relatively high. Although the wound corrugated pipe made of all PE material can obtain good performance, its production cost is relatively high. Moreover, in some occasions that require high strength, the all-PE pipe cannot meet the high-strength requirements.

[0004] Moreover, due to long-term water flow in the pipe and long-term exposure to a humid environment, bacteria are likely to grow on the inner wall of the pipe, which also puts forward the requirement of antibacterial for the pipe body. Summary of the Invention

[0005] The present invention solves the defect that the existing double-wall corrugated pipes are all made of HDPE material and have a high cost, and provides an FRPE multi-layer reinforced composite structure wall pipe. PP and PE are combined, and the inner pipe made of PP is used as a ring-shaped protrusion for reinforcement, so as to obtain high ring stiffness and at the same time reduce the production cost of the wound corrugated pipe.

[0006] The present invention also provides an FRPE multi-layer reinforced composite structure wall pipe. The inner surface and the outer surface of the circumferentially closed intermediate pipe made of PP are respectively compounded with a circumferentially closed inner pipe and a circumferentially closed outer pipe made of PE, so as to avoid direct contact between the PP material and the air and provide protection by the PE material, thereby prolonging the service life of the structure wall pipe.

[0007] The present invention provides an FRPE multi-layer reinforced composite structure wall pipe, and the pipe wall adopts antibacterial polyethylene, so that the corrugated pipe has the function of antibacterial and sterilization, and avoids the growth of bacteria on the inner wall of the pipe.

[0008] The specific technical solution of the present invention is as follows: A FRPE multi-layer reinforced composite structure wall pipe is formed by helically winding a winding unit and bonding it on adjacent sides to form a structure with a double wall and vertical ribs. The double wall is divided into a smooth inner wall and an outer wall with spiral annular protrusions. The vertical ribs separate the inner wall and the outer wall into a hollow cavity. The winding unit is formed by a multi-layer co-extrusion composite method to form a multi-layer structure including a circumferentially closed intermediate pipe made of PP, a circumferentially closed inner pipe made of PE on the inner surface of the circumferentially closed intermediate pipe, and a circumferentially closed outer pipe made of PE on the outer surface of the circumferentially closed intermediate pipe. The winding unit has at least 2 hollow cavities, and at least one of the hollow cavities belongs to the circumferentially closed intermediate pipe made of PP.

[0009] The structural wall pipe has a double-wall structure, and the inner wall and the outer wall are supported by vertical ribs, so that the structural wall pipe has a high ring stiffness, and the outer wall of the structural wall pipe has spiral annular protrusions, and it has a good pipe-soil integral structure after being buried in the soil; the winding unit is formed by a multi-layer co-extrusion composite method, including 3 layers, where the middle layer is a circumferentially closed intermediate pipe made of PP, the outer surface is composite with a circumferentially closed outer pipe made of PE, and the inner surface is composite with a circumferentially closed inner pipe made of PE, and co-extrusion composite is carried out. In this way, the PE material can protect the PP material and avoid the damage of ultraviolet rays to the PP material, thereby extending the service life of the structural wall pipe. At the same time, the circumferentially closed intermediate pipe made of PP provides better strength and reduces costs; at least two hollow cavities prevent the width of one cavity of the winding unit from being too large and having no support in the middle, which affects the ring stiffness.

[0010] In one solution, the winding unit has 3 hollow cavities. The middle hollow cavity belongs to the circumferentially closed intermediate pipe made of PP, and the two side hollow cavities belong to the circumferentially closed outer pipes made of PE. The two side hollow cavities are completely circumferentially closed by the PE layer. The two side hollow cavities are completely circumferentially closed by the PE layer, and only the middle hollow cavity has the circumferentially closed intermediate pipe made of PP. In this way, the co-extrusion composite between the PP material and the PE material can be reduced, the co-extrusion composite difficulty can be reduced, and at the same time, the probability of composite problems can be reduced.

[0011] In another solution, the winding unit has 3 hollow cavities, and all 3 hollow cavities belong to the circumferentially closed intermediate pipe made of PP. The inner wall of each hollow cavity is co-extrusion composite with a circumferentially closed inner pipe made of PE, and the outside of the circumferentially closed intermediate pipe is co-extrusion composite with a circumferentially closed outer pipe made of PE. The circumferentially closed intermediate pipe is an integral structure, and the middle hollow cavity and the two side hollow cavities share adjacent PP vertical ribs. All 3 hollow cavities have the circumferentially closed intermediate pipe made of PP, which greatly improves the ring stiffness of the structural wall pipe after the winding unit is helically wound. The adjacent hollow cavities share the same PP vertical rib, thereby reducing the usage amount of the PP material and reducing the weight of the structural wall pipe.

[0012] In another solution, the winding unit has three hollow cavities, which belong to three independent circumferentially closed intermediate tubes made of PP. The inner wall of each circumferentially closed intermediate tube is co-extruded and compounded with a circumferentially closed inner tube made of PE. The three circumferentially closed intermediate tubes are separated from each other, and the outer parts of the three circumferentially closed intermediate tubes are co-extruded and compounded with a circumferentially closed outer tube made of PE. The circumferentially closed outer tubes are connected into an integral structure. The circumferentially closed intermediate tubes are divided into three, independent of each other, and it is more convenient to adjust the compounding timing between the three layers during co-extrusion compounding.

[0013] Further, the winding unit has three hollow cavities. The height of the middle hollow cavity is the largest, and the heights of the two side hollow cavities are small. The shape and size of the two side hollow cavities are the same and are symmetrically arranged relative to the middle hollow cavity.

[0014] Further, the top of the middle hollow cavity is an arched arc top, and the two side hollow cavities with small heights are square or rectangular; or the top of the middle hollow cavity is an arched arc top, and the tops of the two side hollow cavities with small heights are also arched arc tops.

[0015] Further, the winding unit has three arc tops. After the winding unit is helically wound, the arc tops of the two side hollow cavities are flattened by rollers, and a spiral structure with only one annular protrusion and an interval plane is formed.

[0016] Further, the smooth inner wall is compounded with an antibacterial layer added with yellow pigment; the antibacterial layer is formed by co-extruding and compounding antibacterial sheets outside the PE circumferentially closed outer tube and then helically winding, or the antibacterial layer is formed by separately extruding antibacterial sheets and helically winding them prior to the winding unit.

[0017] Further, the antibacterial layer uses antibacterial polyethylene. By weight ratio: 100 - 105 parts of polyethylene resin, 2 - 4 parts of antibacterial masterbatch, 0.5 - 0.8 parts of antioxidant, 0.2 - 0.3 parts of auxiliary antioxidant, 1 - 2 parts of lubricant, 1 - 2 parts of crosslinking agent, and 1 - 2.5 parts of nano-zinc oxide powder mixture.

[0018] Further, the antibacterial masterbatch includes 50 - 85 parts by weight of thermoplastic resin; 5 - 20 parts by weight of Zn - zeolite; 5 - 20 parts by weight of mildew preventive; 0.2 - 0.4 parts by weight of coupling agent; 0.05 - 0.2 parts by weight of auxiliary agent; 2 - 3 parts by weight of liquid paraffin.

[0019] Further, after the winding unit is co-extruded and compounded and then cooled and shaped, it is helically wound. The two side edges of the winding unit are straight edges. When the winding unit is helically wound, molten glue is filled between adjacent straight edges and bonded by axial extrusion.

[0020] The beneficial effects of the present invention are as follows: The structural wall pipe has a double-wall structure, and the inner wall and the outer wall are supported by vertical ribs, so that the structural wall pipe has a relatively high ring stiffness. Moreover, the outer wall of the structural wall pipe has spiral annular protrusions, and after being buried in the soil, it has a good pipe-soil integral structure; The winding unit is formed by a multi-layer co-extrusion composite method, including three layers. Among them, the middle layer is a circumferentially closed middle pipe made of PP, the outer surface is compounded with a circumferentially closed outer pipe made of PE, and the inner surface is compounded with a circumferentially closed inner pipe made of PE, and they are co-extruded and compounded. In this way, the PE material can protect the PP material and avoid the damage of ultraviolet rays to the PP material, thereby extending the service life of the structural wall pipe. At the same time, the circumferentially closed middle pipe made of PP provides better strength and reduces costs; There are at least two hollow cavities, which can prevent the width of one cavity of the winding unit from being too large and there is no support in the middle part, which affects the ring stiffness. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a winding schematic diagram of the present invention;

[0022] Figure 2 is a structural schematic diagram of a winding unit of the present invention;

[0023] Figure 3 is a structural schematic diagram of the second winding unit of the present invention;

[0024] Figure 4 is a structural schematic diagram of the third winding unit of the present invention;

[0025] Figure 5 is a structural schematic diagram of the fourth winding unit of the present invention;

[0026] Figure 6 is the present invention Figure 5 is a forming schematic diagram of the shown winding unit;

[0027] In the figure: 1. Winding unit, 2. Melted glue, 3. Outer wall, 4. Smooth inner wall, 5. Antibacterial layer, 6. Vertical rib, 7. Hollow cavity, 8. Circumferentially closed inner pipe, 9. Circumferentially closed middle pipe, 10. Circumferentially closed outer pipe, 11. Antibacterial sheet, 12. Square circumferentially closed middle pipe, 13. Arch-shaped circumferentially closed middle pipe, 14. Co-extrusion die. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The present invention will be further described below through specific embodiments in conjunction with the drawings.

[0029] Embodiment 1: An FRPE multi-layer reinforced composite structural wall pipe (see Figure 1), which is formed by helically winding the winding unit 1 and filling and bonding the molten glue 2 on the adjacent side edges, has a structure with a double-layer wall and vertical ribs 6. The double-layer wall is divided into a smooth inner wall 5 and an outer wall 3 with spiral annular protrusions. The vertical ribs divide the space between the inner wall and the outer wall into several hollow cavities 7. The winding unit (see Figure 2 ) is formed by a multi-layer co-extrusion composite method. The winding unit has a multi-layer structure including a circumferentially closed intermediate tube 9 made of PP, a circumferentially closed inner tube 8 made of PE on the inner surface of the circumferentially closed intermediate tube, and a circumferentially closed outer tube 10 made of PE on the outer surface of the circumferentially closed intermediate tube. The two sides of the winding unit are straight edges, and the straight edges are perpendicular to the bottom of the winding unit. The winding unit has 3 hollow cavities. The middle hollow cavity has a three-layer structure, which are an axially closed inner tube made of PE, a circumferentially closed intermediate tube 9 made of PP, and a circumferentially closed outer tube 10 made of PE. The hollow cavities on both sides have a single-layer structure and are completely circumferentially closed by PE layers. The height of the middle hollow cavity is greater than that of the hollow cavities on both sides. The top of the middle hollow cavity is an arched arc top. The shapes of the hollow cavities on both sides are square, and the shape and size of the hollow cavities on both sides are the same and are symmetrically arranged relative to the middle hollow cavity.

[0030] In order to achieve the antibacterial effect, in this embodiment, an antibacterial layer 4 added with yellow pigment is further compounded on the inner surface of the smooth inner wall. The antibacterial layer uses antibacterial polyethylene. By weight ratio: By weight ratio: 100 parts of polyethylene resin, 1 part of antibacterial masterbatch, 0.3 part of antioxidant, 0.2 part of auxiliary antioxidant, 1 part of pentaerythritol stearate, 1 part of di-tert-butyl peroxide, and 1 part of nano-zinc oxide powder mixture. Wherein the polyethylene resin is low-density polyethylene; the antibacterial masterbatch includes 50 parts of thermoplastic resin; 5 parts of Zn-zeolite; 5 parts by weight of mildew preventive; 0.2 part by weight of coupling agent; 0.05 part of cross-linking agent; 2 parts of liquid paraffin.

[0031] The forming process of the above-mentioned structural wall pipe is as follows: First, an antibacterial sheet 11 is extruded by an extruder and then helically wound onto a winding machine to form the antibacterial layer 4. Then, in a co-extrusion die, PP and PE are co-extruded and compounded to form a winding unit 1 with 3 hollow cavities. After the winding unit is cooled and shaped, it is helically wound onto the outer surface of the antibacterial layer. Then, molten glue 2 is filled between the side edges of adjacent winding units, and then axial extrusion and bonding are carried out. A composite vertical rib with PP in the middle and PE on both sides is formed inside the winding unit, and a pure PE PE vertical rib is formed at the bonding part of adjacent winding units. The inner wall and the outer wall of the structural wall pipe are arranged in an arrangement mode of continuously circulating two composite vertical ribs and one PE vertical rib.

[0032] Example 2: An FRPE multi-layer reinforced composite structural wall pipe (see Figure 3), which is different from Example 1 in that: the circumferentially closed intermediate pipe made of PP has 3 hollow cavities, and the inner wall of each hollow cavity is co-extruded and compounded with a circumferentially closed inner pipe made of PE, and the outside of the circumferentially closed intermediate pipe is co-extruded and compounded with a circumferentially closed outer pipe made of PE. The circumferentially closed intermediate pipe is an integral structure, and the middle hollow cavity and the hollow cavities on both sides share adjacent PP vertical ribs. The rest of the structure refers to Example 1.

[0033] Example 3: An FRPE multi-layer reinforced composite structure wall pipe (see Figure 4 ), which is different from Example 2 in that: the circumferentially closed intermediate pipe made of PP is an integral structure with 3 hollow cavities, and the top of each hollow cavity is an arched arc top. The rest of the structure refers to Example 2.

[0034] When the winding unit is helically wound, the arc tops of the hollow cavities on both sides are flattened by rollers, and an outer wall with only one annular protrusion and an alternating flat surface spiral structure is formed.

[0035] Example 4: An FRPE multi-layer reinforced composite structure wall pipe (see Figure 5 ), the winding unit has 3 hollow cavities, and the 3 hollow cavities belong to 3 independent circumferentially closed intermediate pipes made of PP. The middle hollow cavity belongs to the arched circumferentially closed intermediate pipe 13, and the hollow cavities on both sides belong to the square circumferentially closed intermediate pipe 12. The inner wall of each circumferentially closed intermediate pipe is co-extruded and compounded with a circumferentially closed inner pipe made of PE. The 3 circumferentially closed intermediate pipes are separated from each other, and the outside of the 3 circumferentially closed intermediate pipes is co-extruded and compounded with a circumferentially closed outer pipe, and the circumferentially closed outer pipes are connected into an integral structure.

[0036] For the forming process, see Figure 6 , the arched circumferentially closed intermediate pipe and the square circumferentially closed intermediate pipe are separately formed in the co-extrusion die 14, and at the same time, the circumferentially closed inner pipe and the circumferentially closed outer pipe are compounded on the inner and outer surfaces of the three circumferentially closed intermediate pipes in the co-extrusion die, and the circumferentially closed outer pipes are formed into one body in the co-extrusion die. After the winding unit is co-extruded and compounded and formed, it is cooled and shaped and then helically wound, and the molten glue is filled between adjacent straight edges and bonded by axial extrusion.

[0037] Of course, the straight edges on both sides of the winding unit can also be changed to straight edges inclined to the bottom of the winding unit. When the winding unit is helically wound, adjacent straight edges form a V-shaped groove, and the molten glue is filled in the groove and then bonded by axial extrusion.

[0038] The above are only the preferred embodiments of the present invention, and do not impose any restrictions on the present invention. Any simple modifications, changes, and equivalent transformations made to the above embodiments according to the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A FRPE multi-layer reinforced composite structure wall pipe, characterized in that A structure with double-layer walls and vertical ribs is formed by helically winding a winding unit and bonding it on adjacent sides. The double-layer walls are divided into a smooth inner wall and an outer wall with spiral annular protrusions. The vertical ribs divide the space between the inner wall and the outer wall into hollow cavities. The vertical ribs include composite vertical ribs with PP in the middle and PE on both sides. The winding unit is formed by simultaneous multi-layer co-extrusion compounding, forming a multi-layer structure with a circumferentially closed intermediate tube made of PP, a circumferentially closed inner tube made of PE on the inner surface of the circumferentially closed intermediate tube, and a circumferentially closed outer tube made of PE on the outer surface of the circumferentially closed intermediate tube. The winding unit has 3 hollow cavities, and at least one of the hollow cavities is the inner cavity of the circumferentially closed intermediate tube made of PP; the height of the middle hollow cavity is the largest, and the heights of the two side hollow cavities are small. The shape and size of the two side hollow cavities are the same and are symmetrically arranged relative to the middle hollow cavity.

2. The FRPE multi-layer reinforced composite structure wall pipe according to claim 1, characterized in that The middle hollow cavity is the inner cavity of the circumferentially closed intermediate tube made of PP, and the two side hollow cavities are the inner cavities of the circumferentially closed outer tubes made of PE. The two side hollow cavities are completely circumferentially closed by the PE layer.

3. The FRPE multi-layer reinforced composite structure wall pipe according to claim 1, wherein All 3 hollow cavities are the inner cavities of the circumferentially closed intermediate tubes made of PP. The inner wall of each hollow cavity is co-extrusion compounded with a circumferentially closed inner tube made of PE, and the outside of the circumferentially closed intermediate tube is co-extrusion compounded with a circumferentially closed outer tube made of PE. The circumferentially closed intermediate tube is an integral structure, and the middle hollow cavity and the two side hollow cavities share adjacent composite vertical ribs.

4. The FRPE multi-layer reinforced composite structure wall pipe according to claim 1, characterized in that The 3 hollow cavities are respectively the inner cavities of 3 independent circumferentially closed intermediate tubes made of PP. The inner wall of each circumferentially closed intermediate tube is co-extrusion compounded with a circumferentially closed inner tube made of PE. The 3 circumferentially closed intermediate tubes are separated from each other, and the outside of the 3 circumferentially closed intermediate tubes is co-extrusion compounded with a circumferentially closed outer tube made of PE. The circumferentially closed outer tubes are connected into an integral structure.

5. The FRPE multi-layer reinforced composite structure wall pipe according to claim 1 or 2 or 3 or 4, characterized in that The top of the middle hollow cavity is an arched arc top, and the two side hollow cavities with small heights are square or rectangular; or the top of the middle hollow cavity is an arched arc top, and the tops of the two side hollow cavities with small heights are also arched arc tops.

6. The FRPE multi-layer reinforced composite structure wall pipe according to claim 5, wherein The winding unit has three arched arc tops. After the winding unit is helically wound, the arched arc tops of the two side hollow cavities are flattened by rollers, and an outer wall with only one annular protrusion and an alternating flat surface is formed.

7. The FRPE multi-layer reinforced composite structure wall pipe according to claim 1 or 2 or 3 or 4, characterized in that The smooth inner wall is compounded with an antibacterial layer added with yellow pigment; the antibacterial layer is formed by co-extrusion compounding an antibacterial sheet outside the PE circumferentially closed outer tube and then helically winding it, or the antibacterial layer is formed by separately extruding the antibacterial sheet and helically winding it prior to the winding unit.

8. The FRPE multi-layer reinforced composite structure wall pipe according to claim 1 or 2 or 3 or 4, characterized in that After the winding unit is co-extrusion compounded and formed, it is cooled and shaped and then helically wound. The two sides of the winding unit are straight edges. When the winding unit is helically wound, molten glue is filled between adjacent straight edges and bonded by axial extrusion.

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