CN112984233A - High-rigidity polyethylene composite pipe and preparation method thereof - Google Patents
High-rigidity polyethylene composite pipe and preparation method thereof Download PDFInfo
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- CN112984233A CN112984233A CN202110226362.2A CN202110226362A CN112984233A CN 112984233 A CN112984233 A CN 112984233A CN 202110226362 A CN202110226362 A CN 202110226362A CN 112984233 A CN112984233 A CN 112984233A
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- polyethylene
- composite pipe
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/12—Rigid pipes of plastics with or without reinforcement
- F16L9/127—Rigid pipes of plastics with or without reinforcement the walls consisting of a single layer
- F16L9/128—Reinforced pipes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D23/00—Producing tubular articles
- B29D23/001—Pipes; Pipe joints
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Laminated Bodies (AREA)
Abstract
The invention relates to the field of pipe preparation, in particular to a high-rigidity polyethylene composite pipe and a preparation method thereof. The high-rigidity polyethylene composite pipe comprises an inner layer, a reinforcing layer and a coating layer, wherein the reinforcing layer is formed by spirally winding reinforcing strips on the inner layer in a unidirectional mode at a certain interval, and the winding angle of the reinforcing strips and the axial line of the pipe is 40-89 degrees. Through the unidirectional continuous winding of the reinforced strip along the axis, the reinforced composite pipe improves the hoop rigidity and the hoop internal stress, avoids the layering problem and improves the composite effect of the pipe.
Description
Technical Field
The invention relates to the field of pipe preparation, in particular to a high-rigidity polyethylene composite pipe and a preparation method thereof.
Background
In recent years, polyethylene pipes have been widely used in industrial fields such as ships and mines, but they are also limited in many applications in the fields due to disadvantages such as low pipe rigidity caused by a low material modulus. For example, the pipeline has high rigidity required by the transportation of water in a ship ballast tank or the long-distance high-speed transportation of ore pulp on a mine, and the common polyethylene pipe is easily sucked (pressed) flat and damaged due to the action of vacuum and external pressure, so that the working condition requirement cannot be met. Although the rigidity of the steel pipe is high, the steel pipe is heavy and inconvenient to construct, and the effective carrying capacity of the ship is also severely limited; meanwhile, the steel pipe is easy to corrode, the maintenance and operation cost is high, and the service life of the steel pipe is shorter particularly in a seawater medium and humid marine climate environment. Other engineering plastic pipes are also unacceptable to the market due to the high cost of materials and their processing.
Disclosure of Invention
The invention aims to provide a high-rigidity polyethylene composite pipe which can improve the annular rigidity, the annular internal stress and the composite effect of pipes.
In order to achieve the advantages, the high-rigidity polyethylene composite pipe provided by the invention comprises an inner layer, a reinforcing layer and a coating layer, wherein the reinforcing layer is formed by spirally winding reinforcing strips on the inner layer in a unidirectional mode at a certain interval, and the winding angle of the reinforcing strips and the axis of the pipe is 40-89 degrees.
In one embodiment of the invention, the stiffening strip has a winding tension with the tube axis of 0-50 MPa.
In one embodiment of the invention, the stiffening strip is made of glass fibers.
The preparation method of the high-rigidity polyethylene composite pipe is characterized by comprising the following steps of:
firstly, melting and plasticizing a polyethylene raw material through an extruder, and extruding and molding the polyethylene raw material through a special die;
sizing and cooling by a vacuum sizing unit;
forming an inner layer by the cooled polyethylene pipe, enabling the cooled polyethylene pipe to pass through a single-station or multi-station winding unit, and uniformly and spirally winding the stiffening strip on the inner layer at intervals along a single direction by the winding unit to form a reinforcing layer;
step four, after the winding procedure is finished, the cladding compounding procedure is carried out, the same polyethylene raw material is melted and plasticized by the other extruder, and the plasticized polyethylene melt is clad on the outer layer of the reinforcing layer through a die for compounding;
and step five, cooling and drawing the coated composite pipe, and finally cutting off the wire.
In an embodiment of the invention, the fourth step further includes that the reinforced strip material winding pipe is heated by a heating oven before cladding and compounding.
In one embodiment of the invention, the oven heating temperature is 40 ℃ to 350 ℃, and the temperature of the surface of the pipe is 40 ℃ to 150 ℃.
In one embodiment of the invention, in the coating compounding procedure, the temperature of the polyethylene melt is 180-230 ℃, and the vacuum degree of the coating is 0-0.1 MPa.
In one embodiment of the invention, the polyethylene feedstock is a PE100 or PE80 grade material.
In one embodiment of the invention, the composite tube is of the specification dn200, SDR17 or dn500, SDR 17.
According to the invention, by means of unidirectional continuous winding of the stiffening strip along the axis, the hoop rigidity and the hoop internal stress of the stiffened composite pipe are improved, the layering problem is avoided, and the composite effect of the pipe is improved.
Drawings
Fig. 1 is a schematic structural view of a high rigidity polyethylene composite pipe according to a first embodiment of the present invention.
Fig. 2 is a schematic sectional view of the high rigidity polyethylene clad pipe a-a of fig. 1.
Fig. 3 is a schematic flow chart illustrating a method for manufacturing a high rigidity polyethylene composite pipe according to a first embodiment of the present invention.
Fig. 4 shows experimental data of a preparation method of the high rigidity polyethylene composite pipe of the present invention.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the intended purpose, the following detailed description will be provided with reference to the accompanying drawings and preferred embodiments to provide specific embodiments, structures, features and effects thereof.
Referring to fig. 1 and 2, the high rigidity polyethylene composite pipe of the present invention comprises an inner layer 1, a reinforcing layer and a coating layer 3, wherein the reinforcing layer is formed by spirally winding a stiffening strip 2 around the inner layer 1 at a certain interval, the inner layer 1 is thicker than the coating layer 3, the winding angle of the stiffening strip 2 with the pipe axis is 40-89 °, and the winding tension of the stiffening strip 2 is 0-50 MPa. The stiffening strip 2 is made of fiberglass or other high stiffness strip. The width and thickness of the stiffening strip and the interval between the front and the back of winding are adjusted along with the caliber size and the wall thickness size of the inner layer 1.
Referring to fig. 3, a method for preparing a high-rigidity polyethylene composite pipe includes the following steps:
firstly, melting and plasticizing a polyethylene raw material through an extruder, and extruding and molding the polyethylene raw material through a special die;
sizing and cooling by a vacuum sizing unit;
step three, forming an inner layer 1 by the cooled polyethylene pipe, penetrating through a single-station or multi-station winding unit, and uniformly and spirally winding the stiffening strip 2 on the inner layer 1 at intervals along a single direction by the winding unit to form a reinforcing layer;
step four, after the winding procedure is finished, the cladding compounding procedure is carried out, the same polyethylene raw material is melted and plasticized by the other extruder, and the plasticized polyethylene melt is clad on the outer layer of the reinforcing layer through a die for compounding;
and step five, cooling and drawing the coated composite pipe, and finally cutting off the wire.
The winding angle of the stiffening strip 2 in the winding process can be adjusted within 40-89 degrees, the winding tension can be adjusted within 0-50MPa, and the stiffening strip 2 is ensured within the elastic deformation range without yielding failure or fiber strip damage.
And step four, heating the reinforced strip material 2 winding pipe by a heating oven before cladding and compounding. The heating temperature of the oven before cladding and compounding is 40-350 ℃, the surface temperature of the pipe is 40-150 ℃, the thermal stability of polyethylene and the strip is not influenced, and the heating temperature does not cause the offset of the strip in the relative position of the polyethylene pipe. In the cladding compounding procedure, the temperature of the polyethylene melt is 180-230 ℃, and the vacuum degree of cladding is 0-0.1 MPa.
The whole preparation process is completed through an online one-step process, and the process tooling line mainly comprises an extruder, a winding machine, a heating device, a composite shaping device and a control system.
Referring to fig. 4, the polyethylene material is PE100 or PE80 grade material. The composite tube has specification of dn200, SDR17 or dn500, SDR 17. For example: the common PE100 pipe (dn 200, SDR 17) has a solid-wall pipe structure and the performance of the pipe is that the ring stiffness is 15 kN/m2The external pressure intensity is 0.55 MPa; ordinary PE100 pipe (dn 500, SDR 17) with solid wall structure and ring stiffness of 16 kN/m2The external pressure intensity is 0.56 MPa. Compared with a common solid-wall pipe, the composite pipe has the advantages that the ring stiffness and the external pressure intensity are greatly improved after the reinforcing layer is added.
According to the invention, the continuous stiffening strip is wound at a high angle (40-89 degrees) along the axis, so that the stiffening strip is annularly and unidirectionally distributed upwards in the inner layer, the annular rigidity of the composite pipe can be greatly improved, and the annular internal stress of the composite pipe is also improved.
In the invention, the continuously reinforced strips are wound at intervals, so that the inner layer and the coating layer can be adhered to each other through the interval region, the problem of layering between layers of a common multilayer composite pipe due to different materials is solved, and the composite effect of the pipe is improved.
According to the invention, the composite pipe has light weight after stiffening, the carrying capacity of the ship is improved when the ship is used, and the corrosion of the composite pipe in a marine humid environment is avoided due to the chemical inertia of the high polymer material.
In the invention, the final ring stiffness of the composite pipe (SDR 17) after the continuous stiffening strip is wound and stiffened can reach 30kN/m2The pressure is increased by more than 1 time in the same ratio, the bursting pressure reaches more than 4.0MPa, and the pressure bearing capability does not deform under the external pressure of 1.0 MPa.
According to the invention, through the unidirectional continuous winding of the stiffening strip along the axis, the hoop rigidity and the hoop internal stress of the stiffened composite pipe are improved, the layering problem is avoided, and the composite effect of the pipe is improved.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The high-rigidity polyethylene composite pipe comprises an inner layer, a reinforcing layer and a coating layer, and is characterized in that the reinforcing layer is formed by spirally winding reinforcing strips on the inner layer in a unidirectional mode at a certain interval, and the winding angle of the reinforcing strips and the axial line of the pipe is 40-89 degrees.
2. The highly rigid polyethylene composite pipe according to claim 1, wherein the winding tension of the stiffening strip to the pipe axis is 0-50 MPa.
3. The highly rigid polyethylene composite pipe according to claim 1, wherein the stiffening tape is made of glass fibers.
4. The method for preparing a high rigidity polyethylene composite pipe according to any one of claims 1 to 3, characterized by comprising the steps of:
firstly, melting and plasticizing a polyethylene raw material through an extruder, and extruding and molding the polyethylene raw material through a special die;
sizing and cooling by a vacuum sizing unit;
forming an inner layer by the cooled polyethylene pipe, enabling the cooled polyethylene pipe to pass through a single-station or multi-station winding unit, and uniformly and spirally winding the stiffening strip on the inner layer at intervals along a single direction by the winding unit to form a reinforcing layer;
step four, after the winding procedure is finished, the cladding compounding procedure is carried out, the same polyethylene raw material is melted and plasticized by the other extruder, and the plasticized polyethylene melt is clad on the outer layer of the reinforcing layer through a die for compounding;
and step five, cooling and drawing the coated composite pipe, and finally cutting off the wire.
5. The preparation method of the high rigidity polyethylene composite pipe according to claim 4, wherein the fourth step further comprises heating the reinforced strip material winding pipe through a heating oven before cladding and compounding.
6. The method for preparing the high-rigidity polyethylene composite pipe according to claim 5, wherein the heating temperature of an oven is 40-350 ℃, and the temperature of the surface of the pipe is 40-150 ℃.
7. The method for preparing the high rigidity polyethylene composite pipe according to claim 4, wherein in the coating and compounding process, the temperature of the polyethylene melt is 180-230 ℃, and the vacuum degree of the coating is 0-0.1 MPa.
8. The method for preparing the high rigidity polyethylene composite pipe according to claim 4, wherein the polyethylene raw material is PE100 or PE80 grade material.
9. The method for preparing the high rigidity polyethylene composite pipe according to claim 4, wherein the specification of the composite pipe is dn200, SDR17 or dn500, SDR 17.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110226362.2A CN112984233A (en) | 2021-03-01 | 2021-03-01 | High-rigidity polyethylene composite pipe and preparation method thereof |
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| CN202110226362.2A CN112984233A (en) | 2021-03-01 | 2021-03-01 | High-rigidity polyethylene composite pipe and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113864539A (en) * | 2021-09-14 | 2021-12-31 | 临海伟星新型建材有限公司 | Novel low-heat-conduction high-temperature-resistant plastic pipeline and preparation method thereof |
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2021
- 2021-03-01 CN CN202110226362.2A patent/CN112984233A/en active Pending
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| JP2002013675A (en) * | 2000-04-28 | 2002-01-18 | Sekisui Chem Co Ltd | Composite high-pressure pipe |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113864539A (en) * | 2021-09-14 | 2021-12-31 | 临海伟星新型建材有限公司 | Novel low-heat-conduction high-temperature-resistant plastic pipeline and preparation method thereof |
| CN113864539B (en) * | 2021-09-14 | 2024-01-09 | 临海伟星新型建材有限公司 | Novel low-heat-conduction high-temperature-resistant plastic pipeline and preparation method thereof |
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