Continuous glass fiber tape winding reinforced polyethylene composite pipe and preparation method thereof

Abstract

The invention relates to the technical field of composite pipe production and processing, and discloses a continuous glass fiber belt winding reinforced polyethylene composite pipe and a preparation method thereof.The continuous glass fiber belt winding reinforced polyethylene composite pipe comprises a composite inner pipe, the outer wall of the composite inner pipe is fixedly connected with a first bonding layer, and the outer wall of the first bonding layer is fixedly connected with a glass fiber belt reinforcing layer; the two glass fiber belt reinforcing layers are the left-handed winding layer and the right-handed winding layer respectively, the outer wall of each glass fiber belt reinforcing layer is fixedly connected with a second bonding layer, and the outer wall of each second bonding layer is fixedly connected with a composite outer pipe. The annular strength and the axial strength of the pipe are enhanced in a left-handed and right-handed winding mode of the glass fiber belt reinforcing layer, the chemical corrosion resistance and the temperature resistance of the pipe are improved through the special material ratio of the composite inner pipe, the outer pipe and the reinforcing glass fiber belt, the pipe can adapt to various complex use environments, the service life of the pipe is prolonged, and the service life of the pipe is prolonged. In addition, the maintenance frequency is reduced in long-time use, and the environmental resistance and corrosion effect of the pipe are improved.

Description

Technical Field

[0001] The invention relates to the technical field of composite pipe production and processing, in particular to a continuous glass fiber tape wound reinforced polyethylene composite pipe and a preparation method thereof. Background Art

[0002] In today's society, pipelines play a vital role in many fields. With the rapid development of the economy and the continuous advancement of science and technology, the performance requirements for pipelines are also increasing.

[0003] The water supply and drainage system requires reliable pipes to ensure the normal operation of the city. The continuous glass fiber tape wrapped reinforced polyethylene composite pipe is a new type of high-performance composite pipe. This composite pipe is mainly composed of a polyethylene inner layer, a continuous glass fiber tape reinforcement layer and a polyethylene outer layer. The polyethylene inner layer has good corrosion resistance, wear resistance and a smooth inner surface, which can ensure the smooth flow of fluid in the pipe and reduce resistance and friction loss. The continuous glass fiber tape reinforcement layer is the key part of the composite pipe. It is wound by high-strength continuous glass fiber tape. The glass fiber tape has extremely high tensile strength and stiffness, which can significantly improve the strength and stiffness of the pipeline, allowing it to withstand higher pressure and external loads.

[0004] In the prior art, traditional single-material pipes have limitations in strength, corrosion resistance and temperature resistance, and cannot meet multiple complex usage requirements at the same time. The material ratio of the pipes is difficult to balance chemical corrosion resistance and temperature resistance, resulting in poor adaptability in complex environments, short service life and high maintenance costs. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a continuous glass fiber tape wrapped reinforced polyethylene composite pipe and a preparation method thereof, which solves the problem that the material ratio of the pipe is difficult to balance the chemical corrosion resistance and temperature resistance, resulting in poor adaptability in complex environments, short service life and high maintenance costs.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] Continuous glass fiber tape wound reinforced polyethylene composite pipe, including:

[0008] A composite inner tube, wherein the outer wall of the composite inner tube is fixedly connected with a first adhesive layer, the outer wall of the first adhesive layer is fixedly connected with a glass fiber tape reinforcement layer, the glass fiber tape reinforcement layer is provided with two layers, namely a left-handed winding layer and a right-handed winding layer, the outer wall of the glass fiber tape reinforcement layer is fixedly connected with a second adhesive layer, and the outer wall of the second adhesive layer is fixedly connected with a composite outer tube.

[0009] Preferably, the composite inner tube comprises the following raw materials in parts by weight: 30-40 parts of a polyethylene and carbon nanotube mixed material, 20-30 parts of an antistatic polyethylene material, and 25-35 parts of a high temperature resistant polyethylene material; the antistatic polyethylene comprises the following raw materials in parts by weight: 5-10 parts of carbon black, 3-8 parts of carbon fiber, and 2-5 parts of phosphate; the high temperature resistant polyethylene material comprises the following raw materials in parts by weight: 15-25 parts of a polyethylene and polyamide alloy mixed material and 2-3 parts of nano silicon dioxide; the first adhesive layer and the second adhesive layer comprise the following raw materials in parts by weight: 10-15 parts of an epoxy resin adhesive; the reinforcing layer comprises The following raw materials in parts by weight: 30-40 parts of glass fiber, 10-15 parts of calcium carbonate, 5-10 parts of talc, 2-3 parts of silane coupling agent and 25-35 parts of epoxy resin. The composite outer tube comprises the following raw materials in parts by weight: 25-35 parts of polytetrafluoroethylene, 30-40 parts of ultra-high molecular weight polyethylene and 30-40 parts of polyphenylene sulfide composite material and 25-35 parts of polyetheretherketone, wherein the polyethylene and polyamide alloy mixed material is prepared by mixing 60-80% of polyethylene and 20-40% of polyamide, and the polyethylene and carbon nanotube mixed material is prepared by mixing 95-98% of polyethylene and 2-5% of carbon nanotube.

[0010] The method for preparing a continuous glass fiber tape-wound reinforced polyethylene composite pipe comprises the following steps:

[0011] S1. Prepare the reinforced glass fiber tape: first weigh the materials according to the predetermined ratio of each material of the glass fiber tape, then put the weighed materials into a high-speed mixer to mix them evenly, then pour the evenly mixed materials into an extruder for extrusion to obtain the glass fiber tape for use;

[0012] S2. Preparing a composite inner tube: first preparing various materials required for the composite inner tube according to a predetermined ratio, then pouring them into a mixer, stirring them thoroughly and evenly, then pouring the stirred materials into an extruder for extrusion, and extruding the molten materials into a tube through a die at the head of the extruder to form a composite inner tube;

[0013] S3, coating an adhesive layer: prepare an epoxy resin adhesive, then add the epoxy resin adhesive and the functional additive into a mixer and mix them evenly, then use a coating device to evenly coat a layer of the prepared adhesive on the outer wall of the composite inner tube to complete the coating;

[0014] S4, extruding a composite outer tube: first weigh the materials required for the outer tube according to the proportion, then put them into a mixer to fully mix them, then put the prepared materials into an extruder, and then extrude the composite outer tube through the die of the extruder;

[0015] S5. Winding the glass fiber tape reinforcement layer: install the prepared reinforced glass fiber tape on the winding equipment, firstly wind the glass fiber tape tightly and evenly on the composite inner tube coated with the first adhesive layer in a left-handed manner, and after the left-handed winding is completed, wind it in a right-handed manner. After completing the winding of the glass fiber tape reinforcement layer, use the coating equipment to evenly coat the epoxy resin adhesive on its outer wall to form a second adhesive layer, and then apply the adhesive on the inner wall of the composite outer tube, use traction equipment, such as a traction machine or a traction clamp, clamp the processed glass fiber tape reinforcement layer, and then slowly pull it into the pre-prepared composite outer tube.

[0016] Preferably, in S1, the order of adding the materials of the glass fiber tape is as follows: first, the glass fiber is added to the high-speed mixer, the mixer speed is set to 300-500 rpm, and stirred for 5-10 minutes, then calcium carbonate is added while the speed is maintained at 300-500 rpm, and stirring is continued for 5-8 minutes, and then talcum powder is added at the same speed, and stirred for 3-5 minutes, and then the speed is increased to 500-800 rpm, and a silane coupling agent is added, and stirred for 8-12 minutes, and finally, at a speed of 500-800 rpm, epoxy resin is added and stirred for 15-20 minutes, and the extrusion temperature of the extruder is 180-200°C in zone 1, 200-220°C in zone 2, and 220-240°C in zone 3, wherein the extrusion pressure is 10-15MPa, and the screw speed is 80-120 rpm.

[0017] Preferably, in S2, the order of adding the materials of the composite inner tube is to first add the polyethylene and carbon nanotube mixed material into the mixer, set the mixer speed to 500 rpm, and stir for 8 minutes, then add the antistatic polyethylene material while maintaining the speed at 500 rpm, continue stirring for 10 minutes, and then add the high temperature resistant polyethylene material at the same speed and stir for 12 minutes. The extrusion temperature of the extruder is 200°C in zone 1, 220°C in zone 2, and 240°C in zone 3. The extrusion pressure is 15-20MPa, the mold temperature is 220-230°C, and the screw speed is 120 rpm.

[0018] Preferably, in S3, the functional additives include a defoamer, a promoter, a coupling agent and a toughening agent, wherein the addition time of each material is to first add the prepared epoxy resin adhesive into the mixer, the mixer speed is set to 250 rpm, and then the defoamer, promoter, coupling agent and toughening agent are added at the same time, and the stirring is continued at 250 rpm for 20 minutes. The coating pressure is 8-10MPa, the coating speed is 1-2 m / min, and the coating thickness is 0.5-1 mm.

[0019] Preferably, in S4, the order of adding the materials of the composite outer tube is to first add polytetrafluoroethylene to the mixer, set the mixer speed to 400 rpm, and stir for 5 minutes, then add ultra-high molecular weight polyethylene and polyphenylene sulfide composite material and polyetheretherketone at the same time, increase the speed to 500 rpm, and continue stirring for 10 minutes to fully mix the materials. The extrusion temperature of the extruder is 220-240°C in zone 1, 240-260°C in zone 2, and 260-280°C in zone 3. The extrusion pressure is 18-22MPa, the screw speed is 150-180 rpm, and the mold temperature is 250-270°C.

[0020] Preferably, in S5, the winding speed of the glass fiber tape is 0.5-1 m / min for left-hand winding and 0.5-1 m / min for right-hand winding, the winding tension is 10-15 Newton for both left-hand winding and right-hand winding, the coating pressure when applying the second adhesive layer is 10-12 MPa, the coating speed is 1.5-2 m / min, and the traction speed of the traction equipment when installing the glass fiber tape reinforcement layer to the composite outer tube is 0.2-0.5 m / min.

[0021] The present invention provides a continuous glass fiber tape-wound reinforced polyethylene composite pipe and a preparation method thereof. It has the following beneficial effects:

[0022] 1. The present invention enhances the circumferential and axial strength of the pipe by the left-handed and right-handed winding of the glass fiber tape reinforcement layer. The special material ratio of the composite inner pipe and outer pipe and the reinforced glass fiber tape improves the chemical corrosion resistance and temperature resistance of the pipe, can adapt to various complex use environments, extend the service life of the pipe, reduce the number of maintenance times during long-term use, and improve the environmental resistance and corrosion effect of the pipe itself.

[0023] 2. The special materials used for the composite inner tube and the composite outer tube of the present invention give the pipeline excellent chemical corrosion resistance, effectively resist the erosion of various corrosive media, extend the service life of the pipeline, and reduce maintenance and replacement costs. The reasonable combination of multiple high-performance materials and the optimized preparation process make the composite pipe excellent in strength, heat resistance, cold resistance, wear resistance, scratch resistance, etc., and can adapt to the effects of different environmental conditions and application scenarios.

[0024] 3. The characteristics and structural design of the material of the present invention enable the composite pipe to have good thermal insulation and heat resistance, be able to maintain stable performance within a large temperature range, adapt to the medium transportation under different temperature conditions, reduce the impact of thermal expansion and contraction on the pipeline, effectively resist the erosion and aging of various chemical substances, extend the service life of the pipeline, and reduce the risk of leakage and failure caused by corrosion and aging. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A perspective view of the present invention;

[0026] Figure 2 It is a flow chart of the present invention.

[0027] Among them, 1. composite inner tube; 2. first bonding layer; 3. glass fiber tape reinforcement layer; 4. second bonding layer; 5. composite outer tube. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example:

[0030] Please see attached Figure 1 -Attached Figure 2 The embodiment of the present invention provides a continuous glass fiber tape-wound reinforced polyethylene composite pipe, which is characterized by comprising:

[0031] A composite inner tube 1, wherein the outer wall of the composite inner tube 1 is fixedly connected with a first adhesive layer 2, the outer wall of the first adhesive layer 2 is fixedly connected with a glass fiber tape reinforcement layer 3, the glass fiber tape reinforcement layer 3 is provided with two layers, namely a left-handed winding layer and a right-handed winding layer, the outer wall of the glass fiber tape reinforcement layer 3 is fixedly connected with a second adhesive layer 4, and the outer wall of the second adhesive layer 4 is fixedly connected with a composite outer tube 5.

[0032] 2. The continuous glass fiber tape-wrapped reinforced polyethylene composite pipe according to claim 1 is characterized in that: the composite inner pipe 1 comprises the following raw materials in parts by weight: 30-40 parts of a polyethylene and carbon nanotube mixed material, 20-30 parts of an antistatic polyethylene material, and 25-35 parts of a high temperature resistant polyethylene material; the antistatic polyethylene comprises the following raw materials in parts by weight: 5-10 parts of carbon black, 3-8 parts of carbon fiber, and 2-5 parts of phosphate; the high temperature resistant polyethylene material comprises the following raw materials in parts by weight: 15-25 parts of a polyethylene and polyamide alloy mixed material and 2-3 parts of nano silicon dioxide; the first adhesive layer 2 and the second adhesive layer 4 comprise the following raw materials in parts by weight: epoxy resin glue The reinforcing layer 3 comprises the following raw materials in parts by weight: 30-40 parts of glass fiber, 10-15 parts of calcium carbonate, 5-10 parts of talc, 2-3 parts of silane coupling agent and 25-35 parts of epoxy resin; the composite outer tube 5 comprises the following raw materials in parts by weight: 25-35 parts of polytetrafluoroethylene, 30-40 parts of ultra-high molecular weight polyethylene and 30-40 parts of polyphenylene sulfide composite material and 25-35 parts of polyetheretherketone, wherein the polyethylene and polyamide alloy mixed material is prepared by mixing 60-80% of polyethylene and 20-40% of polyamide, and the polyethylene and carbon nanotube mixed material is prepared by mixing 95-98% of polyethylene and 2-5% of carbon nanotube.

[0033] Specifically, the polyethylene and carbon nanotube mixed material improves the strength and conductivity of the composite inner pipe, while enhancing the corrosion resistance and wear resistance of the inner pipe. The addition of carbon nanotubes can form a conductive network, which helps to eliminate static electricity accumulation and improve the safety of the pipeline.

[0034] Carbon black in antistatic polyethylene material acts as a conductive filler, which can form a conductive path in polyethylene, reduce the surface resistance of the inner tube, and prevent static electricity accumulation;

[0035] Carbon fiber enhances the strength and rigidity of the inner tube and also has certain conductive properties, which can further improve the antistatic effect;

[0036] Phosphate, as an auxiliary component of antistatic agent, works together with carbon black and carbon fiber to improve the antistatic effect. At the same time, phosphate may also have a certain flame retardant effect, improving the safety of pipelines.

[0037] The high temperature resistant polyethylene material is a mixture of polyethylene and polyamide alloy to improve the high temperature resistance of the inner tube. Polyamide has a high melting point and glass transition temperature. After being mixed with polyethylene, the inner tube can maintain stable performance at higher temperatures.

[0038] Nano-silicon dioxide enhances the heat resistance and mechanical strength of the inner tube. Nano-silicon dioxide can play a filling and reinforcing role in the polyethylene matrix, improving the thermal stability and mechanical properties of the material;

[0039] The first adhesive layer 2 and the second adhesive layer 4 tightly combine the composite inner tube 1 with the glass fiber reinforced layer 3 and the composite outer tube 5 to ensure the integrity and stability of the composite tube.

[0040] The glass fiber reinforced layer 3 is used as the main reinforcement material to improve the strength and rigidity of the composite pipe. Glass fiber has extremely high tensile strength and elastic modulus, and can effectively withstand the pressure inside the pipe and the external load;

[0041] Calcium carbonate is used as a filling material to reduce costs and improve the hardness and wear resistance of the glass fiber reinforcement layer;

[0042] Talc improves the processing performance of the glass fiber reinforcement layer, reduces friction, and improves the fluidity of the material. At the same time, talc can also improve the heat resistance and corrosion resistance of the reinforcement layer;

[0043] Silane coupling agent improves the interfacial bonding between glass fiber and epoxy resin and improves the overall performance of the reinforcement layer;

[0044] Epoxy resin is used as a binder to bond glass fiber, calcium carbonate, talcum powder and other materials together to form a solid reinforcement layer. At the same time, epoxy resin has good corrosion resistance and heat resistance, and can protect the glass fiber from the influence of the external environment.

[0045] The polytetrafluoroethylene in the composite outer tube 5 provides excellent corrosion resistance, high temperature resistance and low friction coefficient. Polytetrafluoroethylene has extremely high chemical stability and can resist corrosion from various chemical substances. It can also maintain good performance at high temperatures. The low friction coefficient makes the fluid flow inside the pipeline smoother and reduces resistance loss.

[0046] The composite material of ultra-high molecular weight polyethylene and polyphenylene sulfide improves the strength, wear resistance and impact resistance of the composite outer tube. Ultra-high molecular weight polyethylene has extremely high wear resistance and impact resistance, while polyphenylene sulfide has good heat resistance and mechanical strength. After the two are compounded, their respective advantages can be combined to improve the performance of the outer tube;

[0047] Effect: Enhance the mechanical properties of the composite outer tube, making it more resistant to external impact and wear. At the same time, good heat resistance enables it to work normally in high temperature environments;

[0048] PEEK provides higher heat resistance, mechanical strength and corrosion resistance. PEEK is a high-performance engineering plastic with excellent properties and can maintain stable performance under high temperature, high pressure and corrosive environment.

[0049] The method for preparing a continuous glass fiber tape-wound reinforced polyethylene composite pipe comprises the following steps:

[0050] S1. Prepare the reinforced glass fiber tape: first weigh the materials according to the predetermined ratio of each material of the glass fiber tape, then put the weighed materials into a high-speed mixer to mix them evenly, then pour the evenly mixed materials into an extruder for extrusion to obtain the glass fiber tape for use;

[0051] S2. Preparing a composite inner tube: first preparing various materials required for the composite inner tube according to a predetermined ratio, then pouring them into a mixer, stirring them thoroughly and evenly, then pouring the stirred materials into an extruder for extrusion, and extruding the molten materials into a tube through a die at the head of the extruder to form a composite inner tube;

[0052] S3, coating an adhesive layer: prepare an epoxy resin adhesive, then add the epoxy resin adhesive and the functional additive into a mixer and mix them evenly, then use a coating device to evenly coat a layer of the prepared adhesive on the outer wall of the composite inner tube to complete the coating;

[0053] S4, extruding a composite outer tube: first weigh the materials required for the outer tube according to the proportion, then put them into a mixer to fully mix them, then put the prepared materials into an extruder, and then extrude the composite outer tube through the die of the extruder;

[0054] S5. Winding the glass fiber tape reinforcement layer: install the prepared reinforced glass fiber tape on the winding equipment, firstly wind the glass fiber tape tightly and evenly on the composite inner tube coated with the first adhesive layer in a left-handed manner, and after the left-handed winding is completed, wind it in a right-handed manner. After completing the winding of the glass fiber tape reinforcement layer, use the coating equipment to evenly coat the epoxy resin adhesive on its outer wall to form a second adhesive layer, and then apply the adhesive on the inner wall of the composite outer tube, use traction equipment, such as a traction machine or a traction clamp, clamp the processed glass fiber tape reinforcement layer, and then slowly pull it into the pre-prepared composite outer tube.

[0055] In S1, the order of adding the materials of the glass fiber tape is as follows: first, add the glass fiber to the high-speed mixer, set the mixer speed to 300-500 rpm, and stir for 5-10 minutes. Then, while maintaining the speed at 300-500 rpm, add calcium carbonate and continue stirring for 5-8 minutes. Then, at the same speed, add talcum powder and stir for 3-5 minutes. Subsequently, increase the speed to 500-800 rpm, add silane coupling agent and stir for 8-12 minutes. Finally, at a speed of 500-800 rpm, add epoxy resin and stir for 15-20 minutes. The extrusion temperature of the extruder is 180-200°C in zone 1, 200-220°C in zone 2, and 220-240°C in zone 3. The extrusion pressure is 10-15MPa and the screw speed is 80-120 rpm.

[0056] Specifically, glass fiber is added as the main reinforcing material. First, adding a high-speed mixer can make it fully dispersed during the stirring process, providing a uniform foundation for the subsequent addition of other materials. After the glass fiber is initially dispersed, calcium carbonate is added, which can be further mixed with the glass fiber during the stirring process. Calcium carbonate, as a filling material, can reduce costs and improve hardness and wear resistance. The addition of talcum powder can further improve the processing performance of the material, reduce friction, and improve fluidity. Adding it at this time can better mix it on the basis of the existing glass fiber and calcium carbonate. Silane coupling agent is used to improve the interfacial bonding between glass fiber and epoxy resin. Adding it at a higher speed can make it more fully contact with glass fiber and other materials, play a better coupling role, enhance the compatibility of glass fiber and epoxy resin, and improve the strength and toughness of the reinforcement layer. Epoxy resin is used as a binder to bond glass fiber, calcium carbonate, talcum powder and other materials together to form a solid reinforcement layer. Adding it at the end and stirring it thoroughly can ensure that each material is evenly wrapped by epoxy resin;

[0057] Zone 1 is 180-200℃ at a lower temperature, the material begins to preheat and soften, preparing for the subsequent plasticization process. This temperature range can avoid decomposition or performance degradation caused by premature melting of the material. Zone 2 is 200-220℃. As the material advances in the extruder, the temperature gradually rises to fully plasticize the material. This temperature range can make the material have good fluidity and facilitate extrusion molding. Zone 3 is 220-240℃ in the final stage of extrusion. The higher temperature can ensure the uniformity and fluidity of the material, and at the same time make the surface of the extruded product smooth and the size stable. The extrusion pressure provides enough pressure to push the material through the extruder die to ensure the density and dimensional accuracy of the material. The screw speed is 80-120 rpm. Within this speed range, it can ensure that the material is fully plasticized and extruded evenly, improving production efficiency and product quality.

[0058] The order of adding the materials of the composite inner tube in S2 is to first add the polyethylene and carbon nanotube mixed material into the mixer, set the mixer speed to 500 rpm, and stir for 8 minutes. Then, while maintaining the speed at 500 rpm, add the antistatic polyethylene material and continue stirring for 10 minutes. Then, at the same speed, add the high temperature resistant polyethylene material and stir for 12 minutes. The extrusion temperature of the extruder is 200°C in zone 1, 220°C in zone 2, and 240°C in zone 3. The extrusion pressure is 15-20MPa, the mold temperature is 220-230°C, and the screw speed is 120 rpm.

[0059] Specifically, polyethylene and carbon nanotube mixed materials are first added to the mixer to fully disperse the mixed materials with enhanced conductivity and strength, so as to lay a foundation for the subsequent mixing of materials. The uniform distribution of carbon nanotubes is crucial to improving the overall performance of the composite inner tube. After the polyethylene and carbon nanotube mixed materials are initially dispersed, antistatic polyethylene materials are added, wherein components such as carbon black, carbon fiber and phosphate can further improve the antistatic performance of the inner tube, and work together with the existing mixed materials. High-temperature resistant polyethylene materials are added to the mixed system, so that the inner tube can maintain stable performance in a high-temperature environment. The addition of polyethylene and polyamide alloy mixed materials and nano-silicon dioxide improves the heat resistance of the inner tube.

[0060] The lower starting temperature of 200℃ in zone 1 is helpful for preheating and initial plasticization of the material, avoiding decomposition or performance damage of the material due to excessive temperature. The temperature of 220℃ in zone 2 gradually increases to further plasticize the material and achieve good fluidity to prepare for subsequent extrusion molding. 240℃ in zone 3 is in the final stage of extrusion. The higher temperature ensures the uniformity and fluidity of the material, making the surface of the extruded inner tube smooth and the size stable. The extrusion pressure is 15-20MPa. The higher extrusion pressure helps to push the material through the extruder die, making the inner tube more compact and improving its mechanical properties and dimensional accuracy. The mold temperature is 220-230℃. The appropriate mold temperature can make the extruded inner tube quickly cool and shape in the mold, maintaining good dimensional accuracy and surface quality. The screw speed is 120 rpm. The appropriate screw speed can control the residence time and plasticization degree of the material in the extruder to ensure that the material is fully mixed and plasticized.

[0061] In S3, the functional additives include defoamers, promoters, coupling agents and toughening agents. The time for adding each material is to first add the prepared epoxy resin adhesive into the mixer, set the mixer speed to 250 rpm, then add the defoamer, promoter, coupling agent and toughening agent at the same time, and continue to stir at 250 rpm for 20 minutes. The coating pressure is 8-10MPa, the coating speed is 1-2 m / min, and the coating thickness is 0.5-1 mm.

[0062] Specifically, epoxy resin adhesive is added first. Epoxy resin adhesive is used as the main adhesive to provide a carrier for the functional additives added later, ensuring that they can be evenly distributed in the system and play their respective roles. At the same time, defoamer, accelerator, coupling agent and toughening agent are added. Defoamer eliminates bubbles generated during stirring and coating to prevent bubbles from forming defects in the composite pipe and affecting its performance and appearance. Accelerator accelerates the curing reaction of epoxy resin, shortens the curing time, and improves production efficiency. Coupling agent improves the interface bonding force between different materials and improves the bonding strength between the layers of the composite pipe. Toughening agent increases the toughness of epoxy resin and improves the impact resistance and fatigue resistance of the composite pipe.

[0063] The coating pressure is 8-10MPa. Appropriate coating pressure can ensure that the epoxy resin adhesive and functional additives are evenly coated on the surface of the composite pipe to form a coating with uniform thickness; the coating speed is 1-2 meters / minute. Controlling the coating speed can ensure the quality and uniformity of the coating. Too fast speed may cause uneven coating thickness, while too slow speed will reduce production efficiency; the coating thickness is 0.5-1 mm. The appropriate coating thickness can provide sufficient protection without increasing excessive cost and weight.

[0064] The order of adding the materials of the composite outer tube in S4 is to first add polytetrafluoroethylene into the mixer, set the mixer speed to 400 rpm, and stir for 5 minutes, then add ultra-high molecular weight polyethylene and polyphenylene sulfide composite material and polyetheretherketone at the same time, increase the speed to 500 rpm, and continue stirring for 10 minutes to fully mix the materials. The extrusion temperature of the extruder is 220-240°C for zone 1, 240-260°C for zone 2, and 260-280°C for zone 3. The extrusion pressure is 18-22MPa, the screw speed is 150-180 rpm, and the mold temperature is 250-270°C.

[0065] Specifically, polytetrafluoroethylene is first added and stirred at 400 rpm to preliminarily disperse the polytetrafluoroethylene in preparation for subsequent mixing. Polytetrafluoroethylene has excellent corrosion resistance, high temperature resistance and low friction coefficient. Stirring first helps it to better exert its performance in the subsequent mixing process. At the same time, after adding ultra-high molecular weight polyethylene and polyphenylene sulfide composite materials and polyetheretherketone, the speed is increased to 500 rpm. Stirring the ultra-high molecular weight polyethylene and polyphenylene sulfide composite materials can improve strength, wear resistance and impact resistance. Polyetheretherketone can provide higher heat resistance, mechanical strength and corrosion resistance. Increasing the speed can speed up the mixing speed of the two materials with polytetrafluoroethylene, so that they are fully mixed and evenly mixed.

[0066] Zone 1 at 220-240℃ plays the role of preheating and initially plasticizing the material to prevent the material from decomposing or damaging its performance due to excessively high starting temperature. Zone 2 at 240-260℃ further plasticizes the material to achieve good fluidity in preparation for subsequent extrusion molding. Zone 3 at 260-280℃ ensures that the material has uniformity and fluidity in the final stage of extrusion, so that the surface of the extruded composite outer tube is smooth and the size is stable. The extrusion pressure is 18-22MPa, which pushes the material through the extruder die to make the composite outer tube more compact and improve its mechanical properties and dimensional accuracy. The screw speed is 150-180 rpm to control the residence time and plasticization degree of the material in the extruder. The appropriate speed can ensure that the material is fully plasticized and evenly extruded, while improving production efficiency. The mold temperature is 250-270℃, so that the extruded composite outer tube is quickly cooled and shaped in the mold to ensure that the shape and size of the composite outer tube meet the design requirements and improve the appearance quality of the product.

[0067] In S5, the winding speed of the glass fiber tape is 0.5-1 m / min for left-hand winding and 0.5-1 m / min for right-hand winding, the winding tension is 10-15 Newton for both left-hand winding and right-hand winding, the coating pressure when applying the second adhesive layer is 10-12 MPa, the coating speed is 1.5-2 m / min, and the traction speed of the traction equipment when installing the glass fiber tape reinforcement layer to the composite outer tube is 0.2-0.5 m / min.

[0068] Specifically, the speed of left-hand winding and right-hand winding is 0.5-1 m / min. This speed range can ensure that the glass fiber tape is evenly distributed on the composite inner tube during the winding process to form a stable reinforcement structure. The speed is moderate, which will not be too fast to cause loose winding or gaps, nor too slow to affect production efficiency.

[0069] The tension is 10-15 Newtons for both left-hand winding and right-hand winding. Appropriate winding tension can make the glass fiber tape fit tightly on the composite inner tube, and the bonding force between the reinforcement layer and the inner tube is stronger. At the same time, the tension also helps to control the arrangement and distribution of the glass fiber tape to ensure the consistency of the reinforcement effect.

[0070] The coating pressure is 10-12MPa. A higher coating pressure can ensure that the epoxy resin adhesive is fully filled between the glass fiber tape reinforcement layer and the composite outer tube to form a strong bond. The pressure helps to expel air and excess adhesive, making the bonding layer more compact.

[0071] The coating speed is 1.5-2 m / min. Appropriate coating speed can ensure the uniformity and continuity of the adhesive layer. Too fast speed may cause uneven distribution of the adhesive, while too slow speed will reduce production efficiency.

[0072] When installing the glass fiber tape reinforcement layer to the composite outer tube, the pulling speed of the pulling equipment is 0.2-0.5 m / min. The slower pulling speed can ensure that the glass fiber tape reinforcement layer remains stable during installation on the composite outer tube, avoiding stretching, deformation or dislocation due to excessive speed. At the same time, it is also beneficial to control the tension and pressure during the installation process to ensure good bonding between the layers.

[0073] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Continuous glass fiber tape wrapped reinforced polyethylene composite pipe, characterized in that: include: A composite inner tube (1), wherein the outer wall of the composite inner tube (1) is fixedly connected to a first adhesive layer (2), the outer wall of the first adhesive layer (2) is fixedly connected to a glass fiber tape reinforcement layer (3), the glass fiber tape reinforcement layer (3) is provided with two layers, namely a left-handed winding layer and a right-handed winding layer, the outer wall of the glass fiber tape reinforcement layer (3) is fixedly connected to a second adhesive layer (4), and the outer wall of the second adhesive layer (4) is fixedly connected to a composite outer tube (5).

2. The continuous glass fiber tape-wound reinforced polyethylene composite pipe according to claim 1, characterized in that: The composite inner tube (1) comprises the following raw materials in parts by weight: 30-40 parts of a polyethylene and carbon nanotube mixed material, 20-30 parts of an antistatic polyethylene material and 25-35 parts of a high temperature resistant polyethylene material; the antistatic polyethylene comprises the following raw materials in parts by weight: 5-10 parts of carbon black, 3-8 parts of carbon fiber and 2-5 parts of phosphate; the high temperature resistant polyethylene comprises the following raw materials in parts by weight: 15-25 parts of a polyethylene and polyamide alloy mixed material and 2-3 parts of nano silicon dioxide; the first adhesive layer (2) and the second adhesive layer (4) comprise the following raw materials in parts by weight: 10-15 parts of an epoxy resin adhesive; the reinforcing layer (3) ) comprises the following raw materials in parts by weight: 30-40 parts of glass fiber, 10-15 parts of calcium carbonate, 5-10 parts of talc, 2-3 parts of silane coupling agent and 25-35 parts of epoxy resin, the composite outer tube (5) comprises the following raw materials in parts by weight: 25-35 parts of polytetrafluoroethylene, 30-40 parts of ultra-high molecular weight polyethylene and 30-40 parts of polyphenylene sulfide composite material and 25-35 parts of polyetheretherketone, wherein the polyethylene and polyamide alloy mixed material is prepared by mixing 60-80% of polyethylene and 20-40% of polyamide, and the polyethylene and carbon nanotube mixed material is prepared by mixing 95-98% of polyethylene and 2-5% of carbon nanotube.

3. A method for preparing a continuous glass fiber tape-wound reinforced polyethylene composite pipe, applied to the continuous glass fiber tape-wound reinforced polyethylene composite pipe according to any one of claims 1 or 2, characterized in that: The following steps are involved: S1. Prepare the reinforced glass fiber tape: first weigh the materials according to the predetermined ratio of each material of the glass fiber tape, then put the weighed materials into a high-speed mixer to mix them evenly, then pour the evenly mixed materials into an extruder for extrusion to obtain the glass fiber tape for use; S2. Preparing a composite inner tube: first preparing various materials required for the composite inner tube according to a predetermined ratio, then pouring them into a mixer, stirring them thoroughly and evenly, then pouring the stirred materials into an extruder for extrusion, and extruding the molten materials into a tube through a die at the head of the extruder to form a composite inner tube; S3, coating an adhesive layer: prepare an epoxy resin adhesive, then add the epoxy resin adhesive and the functional additive into a mixer and mix them evenly, then use a coating device to evenly coat a layer of the prepared adhesive on the outer wall of the composite inner tube to complete the coating; S4, extruding a composite outer tube: first weigh the materials required for the outer tube according to the proportion, then put them into a mixer to fully mix them, then put the prepared materials into an extruder, and then extrude the composite outer tube through the die of the extruder; S5. Winding the glass fiber tape reinforcement layer: install the prepared reinforced glass fiber tape on the winding equipment, firstly wind the glass fiber tape tightly and evenly on the composite inner tube coated with the first adhesive layer in a left-handed manner, and after the left-handed winding is completed, wind it in a right-handed manner. After completing the winding of the glass fiber tape reinforcement layer, use the coating equipment to evenly coat the epoxy resin adhesive on its outer wall to form a second adhesive layer, and then apply the adhesive on the inner wall of the composite outer tube, use traction equipment, such as a traction machine or a traction clamp, clamp the processed glass fiber tape reinforcement layer, and then slowly pull it into the pre-prepared composite outer tube.

4. The method for preparing a continuous glass fiber tape-wound reinforced polyethylene composite pipe according to claim 3, characterized in that: In S1, the order of adding the materials of the glass fiber tape is as follows: first, add the glass fiber to the high-speed mixer, set the mixer speed to 300-500 rpm, stir for 5-10 minutes, then add calcium carbonate while maintaining the speed at 300-500 rpm, continue stirring for 5-8 minutes, then add talcum powder at the same speed, stir for 3-5 minutes, then increase the speed to 500-800 rpm, add silane coupling agent, stir for 8-12 minutes, finally add epoxy resin at a speed of 500-800 rpm, stir for 15-20 minutes, the extrusion temperature of the extruder is 180-200°C in zone 1, 200-220°C in zone 2, and 220-240°C in zone 3, wherein the extrusion pressure is 10-15MPa, and the screw speed is 80-120 rpm.

5. The method for preparing a continuous glass fiber tape-wound reinforced polyethylene composite pipe according to claim 3, characterized in that: In S2, the order of adding the materials of the composite inner tube is to first add the polyethylene and carbon nanotube mixed material into the mixer, set the mixer speed to 500 rpm, and stir for 8 minutes, then add the antistatic polyethylene material while maintaining the speed at 500 rpm, continue stirring for 10 minutes, and then add the high temperature resistant polyethylene material at the same speed and stir for 12 minutes. The extrusion temperature of the extruder is 200°C in zone 1, 220°C in zone 2, and 240°C in zone 3. The extrusion pressure is 15-20MPa, the mold temperature is 220-230°C, and the screw speed is 120 rpm.

6. The method for preparing a continuous glass fiber tape-wound reinforced polyethylene composite pipe according to claim 3, characterized in that: In S3, the functional additives include defoamers, accelerators, coupling agents and toughening agents, wherein the materials are added in the following manner: first, the prepared epoxy resin adhesive is added into the mixer, the mixer speed is set to 250 rpm, then the defoamers, accelerators, coupling agents and toughening agents are added at the same time, and the mixture is stirred at 250 rpm for 20 minutes. The coating pressure is 8-10 MPa, the coating speed is 1-2 m / min, and the coating thickness is 0.5-1 mm.

7. The method for preparing a continuous glass fiber tape-wound reinforced polyethylene composite pipe according to claim 3, characterized in that: In S4, the order of adding the materials of the composite outer tube is to first add polytetrafluoroethylene into the mixer, set the mixer speed to 400 rpm, and stir for 5 minutes, then add ultra-high molecular weight polyethylene and polyphenylene sulfide composite material and polyetheretherketone at the same time, increase the speed to 500 rpm, and continue stirring for 10 minutes to fully mix the materials. The extrusion temperature of the extruder is 220-240°C in zone 1, 240-260°C in zone 2, and 260-280°C in zone 3. The extrusion pressure is 18-22MPa, the screw speed is 150-180 rpm, and the mold temperature is 250-270°C.

8. The method for preparing a continuous glass fiber tape-wound reinforced polyethylene composite pipe according to claim 3, characterized in that: In S5, the winding speed of the glass fiber tape is 0.5-1 m / min for left-hand winding and 0.5-1 m / min for right-hand winding, the winding tension is 10-15 Newton for both left-hand winding and right-hand winding, the coating pressure when applying the second adhesive layer is 10-12 MPa, the coating speed is 1.5-2 m / min, and the traction speed of the traction equipment when installing the glass fiber tape reinforcement layer to the composite outer tube is 0.2-0.5 m / min.

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