Phosphogypsum modified polyethylene reinforced high-resistance pipe

Abstract

This utility model relates to the field of pipe technology and discloses a phosphogypsum-modified polyethylene reinforced high-strength pipe, including a pipe body formed by spiral winding of a strip. A first reinforcing member is disposed within the strip, and the gaps between the spirally wound strips are bonded by an adhesive layer. A coating layer is disposed on the outer surface of the strip, forming a spiral corrugated pipe after spiral winding. This utility model's reinforced high-strength pipe has high strength, stable structure, and improved impact resistance. It will not rupture or deform easily under instantaneous ultra-high pressure, and its ring stiffness is increased by more than 45%. The coating layer further enhances the ring stiffness and impact resistance of the reinforced high-strength pipe, and also makes the surface of the reinforced high-strength pipe smooth with a low coefficient of friction and strong flow capacity.

Description

Technical Field

[0001] This utility model relates to the field of pipe technology, and in particular to a phosphogypsum-modified polyethylene reinforced high-strength pipe. Background Technology

[0002] Existing municipal water supply and drainage pipes are mainly made of polyethylene, or reinforced with other production processes. The pressure resistance or compressive strength of these pipes is not strong. However, regardless of whether the pipes are made of pure polyethylene resin or other production processes, there are many problems with the production process and pipe quality.

[0003] 1. Pipes made from pure polyethylene raw materials have high material costs and increase energy consumption;

[0004] 2. Low strength, resulting in poor pressure resistance of the pipe;

[0005] 3. It has a large coefficient of linear expansion, making molding and processing difficult;

[0006] 4. Poor wear resistance and high creep ratio;

[0007] 5. Existing reinforced pipe production involves a long and complex process chain, requires significant investment in production equipment, and results in products of the same grade being 20% ​​heavier; production quality is also difficult to control.

[0008] Currently, reinforced polyethylene spiral wound structured wall pipes produced on the market suffer from problems such as low pipe ring stiffness, poor mechanical properties, high production costs, and lack of cost-effectiveness. Utility Model Content

[0009] This application discloses a phosphogypsum-modified polyethylene reinforced high-strength pipe to solve the problems of low ring stiffness, poor mechanical properties, and easy deformation and cracking of the pipe body under external force, which causes drainage leakage and affects environmental protection in the prior art.

[0010] To solve the above problems, the present invention adopts the following technical solution:

[0011] A high-strength pipe reinforced with phosphogypsum-modified polyethylene includes: a pipe body formed by spiral winding of a strip, a first reinforcing member provided inside the strip, the gaps between the spiral windings of the strips being bonded by an adhesive layer, and a coating layer provided on the outer surface of the strips, forming a spiral corrugated pipe after the strips are spirally wound.

[0012] Furthermore, the two ends of the cross-section of the strip are right-angled trapezoids with the inclined sides of the two ends facing each other, and the middle part of the cross-section of the strip is a straight line.

[0013] Furthermore, the strip is made of phosphogypsum-modified polyethylene composite material.

[0014] Furthermore, a second reinforcement is provided within the adhesive layer.

[0015] Furthermore, a cap is provided on the outer surface of the bellows.

[0016] Furthermore, both the first and second reinforcing components are plastic-coated steel wires.

[0017] Furthermore, the adhesive layer is formed by hot-melt bonding of reinforced polyethylene and adhesive resin.

[0018] Furthermore, the covering layer is made of high-density polyethylene material.

[0019] Furthermore, the corrugated pipe has a trapezoidal cross-section.

[0020] Furthermore, the cap is formed by hot-melt bonding of reinforced polyethylene and adhesive resin.

[0021] The technical solution adopted in this utility model can achieve the following beneficial effects:

[0022] 1. This utility model increases the ring stiffness of the reinforced high-strength tube by setting a first reinforcing member in the strip. The gap between the spiral winding of the strip is bonded by the adhesive layer, so that the spiral winding of the strip has a supporting structural strength similar to that of the reinforcing rib, which can better form a spiral corrugated tube. It also makes the reinforced high-strength tube less prone to deformation and cracking under external force. Through the combined action of the first reinforcing member and the reinforcing rib, the reinforced high-strength tube has higher strength and more stable structure, and improves impact resistance. It will not break or deform when subjected to instantaneous ultra-high pressure, and the ring stiffness is increased by more than 45%. The coating layer further improves the ring stiffness and impact performance of the reinforced high-strength tube, and makes the surface of the reinforced high-strength tube smooth with a low coefficient of friction and strong flow capacity.

[0023] 2. In order to realize the high-value utilization of phosphogypsum, this utility model uses phosphogypsum in phosphogypsum-modified polyethylene reinforced high-strength pipes. This not only increases the ring stiffness of the phosphogypsum-modified polyethylene reinforced high-strength pipe, but also reduces the production cost of the product and protects the ecological environment.

[0024] 3. This utility model is formed by spiral winding of sheet strips and bonding the gaps between the spiral windings of the sheet strips with an adhesive layer, so that the spiral windings of the sheet strips have a supporting structural strength similar to reinforcing ribs. After the soil is backfilled into the troughs on the outer surface of the corrugated pipe, the crests will not deform or crack under high load. Compared with cement drainage pipes and cast iron drainage pipes, drainage pipes made in this way are cheaper, have a longer service life, and can easily obtain large-diameter pipes. In addition, due to the low internal friction coefficient, the flow rate is also very high. Moreover, since the drainage pipe is mainly buried underground to bear the external pressure under the internal pressure of the medium it transmits, the phosphogypsum modified polyethylene reinforced high-strength pipe can be used in various environments.

[0025] 4. This utility model further improves the ring stiffness of the reinforced high-strength tube by setting a first reinforcing member in the strip and a second reinforcing member in the adhesive layer, so as to achieve the performance of the same grade of product. Moreover, the weight of the reinforced high-strength tube is reduced by 20% compared with the same grade of product, which reduces the production cost. Furthermore, because the strip and the covering layer can be thermally fused together to form a solid wall, the stress is evenly distributed, and there is no delamination or gaps. This makes the reinforced high-strength tube less prone to deformation and cracking under high load, further improving the ring stiffness of the reinforced high-strength tube.

[0026] 5. This utility model has a large contact area between the outer surface of the corrugated pipe and the soil, resulting in uniform stress distribution, good mechanical properties, and the reinforced high-strength pipe is not easily deformed or cracked.

[0027] 6. This utility model covers the second reinforcing member with a cap, and the cap can further improve the ring stiffness of the reinforced high-strength tube;

[0028] 7. This utility model utilizes phosphogypsum and plastic-coated steel wire to enhance ring stiffness and prevents the plastic-coated steel wire from contacting external water. It employs a coating layer to reinforce the high-strength pipe, which is resistant to ultraviolet rays, aging, has high tensile strength, high elastic modulus, good temperature resistance, and good chemical corrosion resistance. The product has excellent performance, stable quality, small coefficient of variation, high ring stiffness, and good ring flexibility. It can withstand the loads of external soil and ground vehicles. The pipe body can maintain rigidity, is not easily deformed or cracked, and will not leak water, causing environmental pollution. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic cross-sectional view of the tube body disclosed in some embodiments of this application;

[0031] Figure 2 yes Figure 1 Enlarged structural diagram at point A;

[0032] Figure 3 This is a schematic cross-sectional view of the strip structure disclosed in some embodiments of this application;

[0033] Figure 4 This is a schematic diagram of the structure of the tube disclosed in some embodiments of this application.

[0034] In the picture:

[0035] 100-Tube body; 200-Sheet / strip; 300-First reinforcing member; 400-Adhesive layer; 500-Covering layer; 600-Second reinforcing member; 700-Cap. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0037] The terms "first," "second," "third," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," "third," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0038] The following is in conjunction with the appendix Figures 1 to 4 This application provides a detailed description of a phosphogypsum-modified polyethylene reinforced high-strength pipe through specific embodiments and application scenarios.

[0039] Reference Figure 1 , Figure 2 and Figure 4 A high-strength pipe reinforced with phosphogypsum-modified polyethylene includes: a pipe body 100, which is formed by spirally winding a strip 200, a first reinforcing member 300 is provided inside the strip 200, the gaps between the spirally wound strips 200 are bonded by an adhesive layer 400, and a covering layer 500 is provided on the outer surface of the strip 200. The strip 200 forms a spiral corrugated pipe after being spirally wound.

[0040] Specifically, a first reinforcing member 300 is provided at the bottom of the inner plate and strip 200; by providing the first reinforcing member 300 in the plate and strip 200, the ring stiffness of the reinforced high-strength tube is increased; the gap between the spiral windings of the plate and strip 200 is bonded by the adhesive layer 400, so that the spiral windings of the plate and strip 200 have a supporting structural strength similar to that of reinforcing ribs, better forming a spiral corrugated tube, and making the reinforced high-strength tube less prone to deformation and cracking under external force; through the combined action of the first reinforcing member 300 and the reinforcing ribs, the reinforced high-strength tube has higher strength and more stable structure, improves impact resistance, and will not break or deform under instantaneous ultra-high pressure, increasing the ring stiffness by more than 45% (that is, the ring stiffness with phosphogypsum and the first reinforcing member 300 is ≥45% higher than that without phosphogypsum and without the first reinforcing member 300); the covering layer 500 further improves the ring stiffness and impact performance of the reinforced high-strength tube, and makes the surface of the reinforced high-strength tube smooth with a low coefficient of friction and strong flow capacity.

[0041] Reference Figures 1 to 3 In this embodiment, the two ends of the cross-section of the strip 200 are right-angled trapezoids, and the inclined sides of the two ends are arranged opposite to each other. The middle part of the cross-section of the strip 200 is a straight line.

[0042] Specifically, the vertical edges at both ends of the strip 200 are set opposite to each other. When bonded by the adhesive layer 400, the vertical edges at adjacent ends of the strip 200 are bonded together, so that the vertical edges have supporting force and act as reinforcing ribs. This gives the formed corrugated pipe good ring stiffness, making the reinforced high-strength pipe less prone to deformation and cracking under external force. The vertical edges at both ends of the strip 200 are located in the normal direction of the pipe body 100.

[0043] Reference Figures 1 to 3 In this embodiment, the strip 200 is made of phosphogypsum modified polyethylene (HDPE-PG) composite material.

[0044] Specifically, phosphogypsum is acid-washed until it turns white, and then calcined at high temperature to obtain calcined phosphogypsum. The calcined phosphogypsum is mixed with a surfactant, ball-milled, and sieved to obtain modified phosphogypsum powder. The modified phosphogypsum powder is mixed with high-density polyethylene powder, and then surface activators (silane KH-550, KH-570, dodecyl phosphate, octadecyl phosphate, and trimethyldodecyl ammonium chloride) and interfacial reinforcing agents (diisopropylbenzene peroxide and cyanuric acid) are added. The mixture is then melt-extruded and granulated using a twin-screw extruder to obtain a phosphogypsum-modified polyethylene composite material. This composite material is reinforced and toughened, with small tensile deformation. The tensile strength of the material can reach 35 MPa, and the ring stiffness of the pipe can reach 30 KN, far exceeding the maximum ring stiffness of 16 KN for steel-reinforced polyethylene spiral corrugated pipes.

[0045] In order to realize the high-value utilization of phosphogypsum, this utility model uses phosphogypsum in phosphogypsum-modified polyethylene reinforced high-strength pipes. This not only increases the pipe body stiffness by 100 rings, but also reduces the production cost of the product, and protects the ecological environment.

[0046] Reference Figure 1 and Figure 2 In this embodiment, a second reinforcing member 600 is provided in the adhesive layer 400 to further improve the ring stiffness of the reinforced high-strength tube to achieve the performance of the same grade of product. Moreover, the weight of the reinforced high-strength tube is reduced by 20% compared with the same grade of product, thus reducing production costs.

[0047] Specifically, a second reinforcing member 600 is added to the bonding area on the corrugated pipe 5-10 mm below the crest, and then the second reinforcing member 600 is covered by hot-melt bonding of reinforced polyethylene and adhesive resin.

[0048] Reference Figure 1 and Figure 2 In this embodiment, a cap 700 is provided on the outer surface of the corrugated pipe to cover the second reinforcing member 600, and the cap 700 can further improve the ring stiffness of the reinforced high-strength pipe.

[0049] Reference Figure 1 and Figure 2 In this embodiment, both the first reinforcing member 300 and the second reinforcing member 600 are plastic-coated steel wires. After the steel wires are plastic-coated, no delamination or gaps will occur between the first reinforcing member 300 and the strip 200, and between the second reinforcing member 600 and the adhesive layer 400 and the cap 700, forming a solid wall and evenly distributing the force, thereby significantly improving the ring stiffness.

[0050] Reference Figure 1 and Figure 2 In this embodiment, the adhesive layer 400 is formed by hot-melt bonding of reinforced polyethylene and adhesive resin, which improves the adhesion and impact resistance of the adhesive layer 400 and further improves the ring stiffness of the reinforced high-strength pipe.

[0051] Reference Figure 1 and Figure 2 In this embodiment, the covering layer 500 is made of high-density polyethylene material, which makes the surface of the reinforced high-strength pipe smooth, with good water flow performance, a smooth surface, a low coefficient of friction, and strong flow capacity.

[0052] Reference Figure 1 and Figure 2 In this embodiment, the cross-section of the bellows is trapezoidal.

[0053] Specifically, the trapezoidal structure design results in a larger load-bearing surface and stronger load-bearing capacity. The continuous winding molding process allows the external load to be quickly distributed throughout the pipeline. The corrugated structure of the pipe is reinforced with the first reinforcing member 300, the second reinforcing member 600, and reinforcing ribs. In addition, phosphogypsum modified polyethylene composite material is used as the main raw material for pipe production, which increases the product strength by more than 45%. This makes the pipe stronger and more stable, and it will not break or deform under instantaneous ultra-high pressure. Laboratory tests show that the creep rate of the pipe is ≤3.2%.

[0054] Reference Figure 1 and Figure 2 In this embodiment, the cap 700 is formed by hot-melt bonding of reinforced polyethylene and adhesive resin, which improves the adhesion and impact resistance of the cap 700 and further improves the ring stiffness of the reinforced high-strength pipe.

[0055] Reference Figures 1 to 4 In this embodiment, the strip 200 and the first reinforcing member 300 are first formed by multi-layer co-extrusion molding. Then, the strip 200 and the covering layer 500 are thermally fused together. The strip 200 is then wound into a forming roller in a spiral manner using a winding molding machine. After winding, they overlap each other. The gap between the spiral windings is bonded together by an adhesive layer 400 formed by thermal fusion bonding of reinforced polyethylene and adhesive resin. Then, a second reinforcing member 600 is added to the corrugated pipe at the bonding point 5-10mm below the crest. Then, a cap 700 formed by thermal fusion bonding of reinforced polyethylene and adhesive resin is used to cover the second reinforcing member 600 and the crest of the corrugated pipe. Using this manufacturing method, a large-diameter pipe that cannot be obtained by conventional methods can be obtained. The pipe diameter can reach more than 2m.

[0056] The experimental data analysis and comparison of the physical and mechanical properties of the phosphogypsum-modified polyethylene reinforced high-strength pipe of this invention with other similar pipe structures are shown in the table below:

[0057]

[0058] In conventional high-density polyethylene (HDPE) reinforced spiral pipes, the outer wall of the pipe substrate is corrugated with an inner liner to improve ring stiffness. However, the strength is not high, and because the liner and the inner liner are made of PP polypropylene, the two materials cannot be fused together, resulting in delamination and gaps. Consequently, the pipe has poor mechanical properties under external forces, and the corrugated pipe is prone to deformation and cracking. This solution improves upon the former by modifying the structure of the strip 200 and adding a first reinforcing member 300 and a second reinforcing member 600. An adhesive layer 400 and a cap 700 are used for bonding and covering, and a covering layer 500 is used to improve ring stiffness and impact resistance. This results in a reinforced high-strength pipe with good mechanical properties under external forces, making it less prone to deformation and cracking. The ring stiffness of the reinforced high-strength pipe with phosphogypsum and plastic-coated steel wire is ≥45% higher than that without phosphogypsum and plastic-coated steel wire.

[0059] In summary, this invention utilizes phosphogypsum and plastic-coated steel wire to enhance ring stiffness while preventing the plastic-coated steel wire from contacting external water. The 500mm coating layer and reinforced high-strength pipe provide UV resistance, aging resistance, high tensile strength, high elastic modulus, good temperature resistance, and good chemical corrosion resistance. The product exhibits excellent performance, stable quality, low coefficient of variation, high ring stiffness, and good ring flexibility, capable of withstanding loads from external soil and vehicles on the ground. The pipe body maintains rigidity, is not easily deformed or cracked, and will not leak water, causing environmental pollution. Furthermore, the large contact area between the corrugated pipe's outer surface and the soil ensures uniform stress distribution and good mechanical properties, making the reinforced high-strength pipe less prone to deformation and cracking.

[0060] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0061] Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0062] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A phosphogypsum-modified polyethylene reinforced high-strength pipe, characterized in that, include: The tube body (100) is formed by spirally winding a strip (200). A first reinforcing member (300) is provided inside the strip (200). The gaps between the spirally wound strips (200) are bonded by an adhesive layer (400). A covering layer (500) is provided on the outer surface of the strip (200). The strip (200) forms a spiral corrugated tube after spiral winding.

2. The phosphogypsum-modified polyethylene reinforced high-strength pipe according to claim 1, characterized in that, The two ends of the cross-section of the strip (200) are right-angled trapezoids, and the inclined sides at both ends are arranged opposite each other. The middle part of the cross-section of the strip (200) is a straight line.

3. The phosphogypsum-modified polyethylene reinforced high-strength pipe according to claim 2, characterized in that, The strip (200) is made of phosphogypsum modified polyethylene composite material.

4. The phosphogypsum-modified polyethylene reinforced high-strength pipe according to claim 1, characterized in that, A second reinforcement (600) is provided within the adhesive layer (400).

5. The phosphogypsum-modified polyethylene reinforced high-strength pipe according to claim 1, characterized in that, The outer surface of the bellows is provided with a cap (700).

6. The phosphogypsum-modified polyethylene reinforced high-strength pipe according to claim 4, characterized in that, Both the first reinforcing member (300) and the second reinforcing member (600) are plastic-coated steel wires.

7. The phosphogypsum-modified polyethylene reinforced high-strength pipe according to claim 1, characterized in that, The covering layer (500) is made of high-density polyethylene material.

8. The phosphogypsum-modified polyethylene reinforced high-strength pipe according to claim 1, characterized in that, The corrugated pipe has a trapezoidal cross-section.

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