High toughness pe100rc gas pipe and method of making same

Abstract

The application relates to the technical field of PE gas pipes, in particular to a high-toughness PE100RC gas pipe and a preparation method thereof. On the structure of the PE gas pipe, the structures of an inner layer, an intermediate framework layer and an outer layer are designed, the material of the intermediate framework layer comprises MDPE and glass fibers, and titanium dioxide and tungsten dioxide are added, so that the intermediate framework layer provides framework support for the pipe material and has good toughness and pressure resistance. Since the intermediate framework of the spiral structure is similar to a spring, the intermediate framework itself does not excessively affect the flexibility of the whole pipe material. The main materials of the inner and outer layer materials are HDPE and MDPE which are mixed according to a certain proportion, so that the flexibility of the pipe material is further increased. The ultraviolet radiation modified aromatic polyamide master batch is added to the inner layer material, so that the inner layer material has good corrosion resistance and flame resistance, the aging of the PE pipe is delayed, and the strength of the pipe material is enhanced. The sisal fibers and bamboo fibers are added to the outer layer material, so that the strength and corrosion resistance of the pipe material are further improved.

Description

Technical Field

[0001] This invention relates to the field of PE gas pipe technology, and in particular to a high-toughness PE100RC gas pipe and its preparation method. Background Technology

[0002] The main material of PE100RC pipe is selected from high-density polyethylene (HDPE). Compared with PE80 pipe, it has better crack propagation resistance, tensile properties, pressure resistance and impact resistance. However, PE80 pipe has better flexibility, and most existing gas pipes use PE80 pipe.

[0003] Flexibility is an important indicator for gas pipe materials. During operation, gas pipelines often experience stress due to temperature changes caused by the transported gas. The construction of flexible gas pipes can reduce stress at pipe joints, preventing accidents such as pipe cracking and gas leaks. Flexible gas pipes also allow for bending and torsion at pipe joints, mitigating stress caused by ground subsidence and preventing gas leaks at pipe joints.

[0004] Therefore, how to ensure the flexibility of gas pipes while also possessing high resistance to crack propagation, tensile strength, pressure resistance, and impact resistance has become an urgent technical problem to be solved. Summary of the Invention

[0005] The technical problem to be solved by this invention is: how to ensure the flexibility of the gas pipe while also possessing high crack propagation performance, tensile performance, pressure bearing capacity and impact resistance.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] The preparation method of high-toughness PE100RC gas pipe includes the following steps:

[0008] S1: Aromatic polyamide is subjected to ultraviolet irradiation treatment in the molten state for 5-7 hours and then extruded and granulated to obtain modified aromatic polyamide masterbatch;

[0009] S2: Extruding inner layer preform, the inner layer preform is prepared from the following raw materials in parts by weight: 30-40 parts HDPE resin, 60-70 parts MDPE, 15-20 parts polyamide-polyolefin block copolymer, 12-15 parts POE toughening agent, 6-10 parts coconut shell fiber and 30-45 parts modified aromatic polyamide masterbatch.

[0010] S3: A spiral intermediate skeleton layer is extruded on the outside of the inner tube blank. The intermediate skeleton layer is prepared from the following raw materials in parts by weight: 16-18 parts MDPE, 6-7 parts glass fiber, 0.5-1 parts titanium dioxide and 0.5-1 parts tungsten dioxide.

[0011] S4: An outer tube blank is extruded on the outside of the inner tube blank and the intermediate skeleton layer. The outer tube blank is prepared from the following raw materials in parts by weight: 30-40 parts HDPE resin, 60-70 parts MDPE, 1-2 parts UV stabilizer, 0.5-2 parts POE toughening agent, 8-12 parts dioctyl phthalate, 4-6 parts cyclohexanone, 3-9 parts coumarone resin, 5-9 parts melamine, 4-8 parts chlorinated paraffin, 3-7 parts methacrylic acid, 3-8 parts titanium dioxide, 3-6 parts sisal fiber, and 3-6 parts bamboo fiber.

[0012] Furthermore, in the above-mentioned method for preparing high-toughness PE100RC gas pipe, the spiral pitch of the intermediate skeleton layer is 7-9 cm.

[0013] Furthermore, the above-mentioned method for preparing high-toughness PE100RC gas pipe is based on an extrusion device, which includes:

[0014] frame;

[0015] An extrusion spindle is rotatably connected to a frame, and a first helical section is connected to the side of the extrusion spindle;

[0016] A central die, which is connected to the frame, is a rotating body, and its axis coincides with the axis of the extrusion spindle;

[0017] The first extrusion sleeve is connected to the frame and is sleeved on the outside of the extrusion main shaft. The front section of the first extrusion sleeve forms a first extrusion chamber with the extrusion main shaft, and the rear section of the first extrusion sleeve forms an annular extrusion die cavity with the central die.

[0018] A rotating sleeve is coaxially and rotatably connected to the outside of a first extrusion sleeve. The rear section of the rotating sleeve extends to the rear of the first extrusion sleeve in the extrusion direction. The inner diameter of the rear section of the rotating sleeve is the same as the diameter of the rear section of the first extrusion sleeve. An extrusion cavity is formed between the rear section of the rotating sleeve and the central die. An annular channel is provided inside the rotating sleeve, and the annular channel communicates with the outer circumferential surface of the rotating sleeve. An extrusion channel communicating with the inner wall of the rear section of the rotating sleeve is connected to the annular channel. A second spiral portion is provided on the outer wall of the rotating sleeve.

[0019] An annular rotary connecting part is rotary sealed to the annular channel portion of the rotary sleeve, and the annular connecting part is connected to a feed pipe;

[0020] A drive mechanism is connected to the extrusion spindle and the rotating sleeve for driving the extrusion spindle and the rotating sleeve to rotate.

[0021] The second extrusion sleeve is connected to the frame and coaxially sleeved around the outside of the rotating sleeve, forming a second extrusion chamber between the second extrusion sleeve and the rotating sleeve; the rear section of the second extrusion sleeve extends to the rear of the rear section of the rotating sleeve in the extrusion direction, and an extrusion die cavity is formed between the rear section of the second extrusion sleeve and the central die, and the inner diameter of the rear section of the second extrusion sleeve is larger than the inner diameter of the rear section of the first extrusion sleeve;

[0022] In the preparation method:

[0023] S2 specifically involves: the inner tube blank raw materials are mixed evenly, melted, and then fed into the first extrusion chamber to extrude the inner tube blank;

[0024] S3 specifically involves: mixing the intermediate layer skeleton material evenly, melting it, and then feeding it into the annular channel through the feed pipe. Under pressure, the material is then extruded into the extrusion channel. During the uniform extrusion of the inner layer tube blank, the rotating sleeve is controlled to rotate continuously at a uniform speed, so that the intermediate layer skeleton material is extruded into the outer side of the inner layer tube blank in a spiral shape.

[0025] S4 specifically involves: mixing the outer tube blank raw material evenly, melting it, and then feeding it into the second extrusion chamber. Under the rotation of the rotating sleeve, the second spiral part extrudes the raw material in the second extrusion chamber to the outside of the inner tube blank and the intermediate skeleton layer.

[0026] Furthermore, in the above-mentioned method for preparing high-toughness PE100RC gas pipe, the driving mechanism in the extrusion equipment includes a first drive motor, a first bevel gear, a second bevel gear, a first rotating shaft, a first pulley, a second pulley, a transmission belt, a third bevel gear, a fourth bevel gear, and a second rotating shaft;

[0027] The first drive motor is connected to the extrusion main shaft, the first bevel gear is coaxially sleeved on the extrusion main shaft, the first rotating shaft is connected to the frame through a bearing, the first rotating shaft is perpendicular to the extrusion main shaft, the second bevel gear is coaxially connected to the first rotating shaft, the second bevel gear meshes with the first bevel gear, and the first pulley is coaxially connected to the first rotating shaft;

[0028] The third bevel gear is coaxially sleeved on the rotating sleeve;

[0029] The second rotating shaft is connected to the frame via a main bearing and is perpendicular to the extrusion main shaft. The fourth bevel gear is coaxially connected to the second rotating shaft and meshes with the third bevel gear. The second pulley is coaxially connected to the second rotating shaft, and the transmission belt is connected to the first pulley and the second pulley.

[0030] Furthermore, in the above-mentioned method for preparing high-toughness PE100RC gas pipe, in the extrusion equipment, the feed pipe is provided with an extrusion screw, and the extrusion screw is drivenly connected to a second drive motor.

[0031] Furthermore, in the above-mentioned method for preparing high-toughness PE100RC gas pipe, in step S1, the wavelength of ultraviolet light is 0.03-0.1μm.

[0032] Furthermore, in the above-mentioned method for preparing high-toughness PE100RC gas pipe, an extrusion device is used, and the extrusion device includes:

[0033] frame;

[0034] An extrusion spindle is rotatably connected to a frame, and a first helical section is connected to the side of the extrusion spindle;

[0035] A central die, which is connected to the frame, is a rotating body, and its axis coincides with the axis of the extrusion spindle;

[0036] The first extrusion sleeve is connected to the frame and is sleeved on the outside of the extrusion main shaft. The front section of the first extrusion sleeve forms a first extrusion chamber with the extrusion main shaft, and the rear section of the first extrusion sleeve forms an annular extrusion die cavity with the central die.

[0037] A rotating sleeve is coaxially and rotatably connected to the outside of a first extrusion sleeve. The rear section of the rotating sleeve extends to the rear of the first extrusion sleeve in the extrusion direction. The inner diameter of the rear section of the rotating sleeve is the same as the diameter of the rear section of the first extrusion sleeve. An extrusion cavity is formed between the rear section of the rotating sleeve and the central die. An annular channel is provided inside the rotating sleeve, and the annular channel communicates with the outer circumferential surface of the rotating sleeve. An extrusion channel communicating with the inner wall of the rear section of the rotating sleeve is connected to the annular channel. A second spiral portion is provided on the outer wall of the rotating sleeve.

[0038] An annular rotary connecting part is rotary sealed to the annular channel portion of the rotary sleeve, and the annular connecting part is connected to a feed pipe;

[0039] A drive mechanism is connected to the extrusion spindle and the rotating sleeve for driving the extrusion spindle and the rotating sleeve to rotate.

[0040] The second extrusion sleeve is connected to the frame and coaxially sleeved around the outside of the rotating sleeve, forming a second extrusion chamber between the second extrusion sleeve and the rotating sleeve; the rear section of the second extrusion sleeve extends to the rear of the rear section of the rotating sleeve in the extrusion direction, and an extrusion die cavity is formed between the rear section of the second extrusion sleeve and the central die, and the inner diameter of the rear section of the second extrusion sleeve is larger than the inner diameter of the rear section of the first extrusion sleeve;

[0041] The drive mechanism includes a first drive motor, a first bevel gear, a second bevel gear, a first rotating shaft, a first pulley, a second pulley, a transmission belt, a third bevel gear, a fourth bevel gear, and a second rotating shaft;

[0042] The first drive motor is connected to the extrusion main shaft, the first bevel gear is coaxially sleeved on the extrusion main shaft, the first rotating shaft is connected to the frame through a bearing, the first rotating shaft is perpendicular to the extrusion main shaft, the second bevel gear is coaxially connected to the first rotating shaft, the second bevel gear meshes with the first bevel gear, and the first pulley is coaxially connected to the first rotating shaft;

[0043] The third bevel gear is coaxially sleeved on the rotating sleeve;

[0044] The second rotating shaft is connected to the frame via a main bearing and is perpendicular to the extrusion main shaft. The fourth bevel gear is coaxially connected to the second rotating shaft and meshes with the third bevel gear. The second pulley is coaxially connected to the second rotating shaft, and the transmission belt is connected to the first pulley and the second pulley.

[0045] The feed pipe is equipped with an extrusion screw, and the extrusion screw is driven by a second drive motor.

[0046] The preparation method includes the following steps:

[0047] S1: Aromatic polyamide is subjected to ultraviolet irradiation treatment in the molten state for 5-7 hours and then extruded and granulated to obtain modified aromatic polyamide masterbatch;

[0048] S2: The inner layer tube blank raw materials are mixed evenly, melted, and then fed into the first extrusion chamber to extrude the inner layer tube blank. The inner layer tube blank is prepared from the following raw materials in parts by weight: 30-40 parts HDPE resin, 60-70 parts MDPE, 15-20 parts polyamide-polyolefin block copolymer, 12-15 parts POE toughening agent, 6-10 parts coconut shell fiber, and 30-45 parts modified aromatic polyamide masterbatch. The inner layer tube blank raw materials are mixed evenly, melted, and then fed into the first extrusion chamber to extrude the inner layer tube blank.

[0049] S3: Mix the intermediate layer skeleton material evenly, melt it, and then pass it into the annular channel through the feed pipe. Under pressure, it is extruded into the extrusion channel. During the uniform extrusion of the inner layer tube blank, the rotating sleeve is controlled to rotate continuously at a uniform speed, so that the intermediate layer skeleton material is extruded into the outer side of the inner layer tube blank in a spiral shape. The intermediate skeleton layer is prepared from the following parts by weight of raw materials: 16-18 parts MDPE, 6-7 parts glass fiber, 0.5-1 parts titanium dioxide and 0.5-1 parts tungsten dioxide.

[0050] S4: Mix the outer layer tube blank raw materials evenly, melt them, and put them into the second extrusion chamber. Under the rotation of the rotating sleeve, the second spiral part extrudes the raw materials in the second extrusion chamber to the outside of the inner layer tube blank and the middle skeleton layer. The outer layer tube blank is prepared from the following raw materials in parts by weight: 30-40 parts HDPE resin, 60-70 parts MDPE, 1-2 parts UV stabilizer, 0.5-2 parts POE toughening agent, 8-12 parts dioctyl phthalate, 4-6 parts cyclohexanone, 3-9 parts coumarone resin, 5-9 parts melamine, 4-8 parts chlorinated paraffin, 3-7 parts methacrylic acid, 3-8 parts titanium dioxide, 3-6 parts sisal fiber, and 3-6 parts bamboo fiber.

[0051] The present invention also protects the gas pipe prepared by the above-described preparation method.

[0052] The beneficial effects of this invention are as follows: The prepared PE gas pipe structure incorporates an inner layer, a middle skeleton layer, and an outer layer. The middle skeleton layer is made of MDPE and glass fiber, with titanium dioxide and tungsten dioxide incorporated, providing structural support for the pipe and exhibiting excellent toughness and pressure resistance. Because the spiral structure of the middle skeleton resembles a spring, it does not significantly affect the overall flexibility of the pipe. The main materials of the inner and outer layers are a mixture of HDPE and MDPE in a certain proportion, further increasing the pipe's flexibility. The inner layer material includes UV-modified aromatic polyamide masterbatch, which provides excellent corrosion resistance and flame retardant properties, delays PE pipe aging, and enhances pipe strength. The outer layer material includes sisal fiber and bamboo fiber, further improving the pipe's strength and corrosion resistance. Attached Figure Description

[0053] Figure 1 This is a schematic diagram of the structure of the extrusion equipment according to a specific embodiment of the present invention;

[0054] Figure 2 A cross-sectional view of the high-toughness PE100RC gas pipe prepared according to a specific embodiment of the present invention;

[0055] Label Explanation:

[0056] 1. Extrusion spindle; 11. First spiral section;

[0057] 2. Central mold;

[0058] 3. First extrusion sleeve;

[0059] 4. First extrusion chamber;

[0060] 5. Rotating sleeve; 51. Annular channel; 52. Extrusion channel; 53. Second spiral section;

[0061] 6. Annular rotary connection part; 61. Feed pipe;

[0062] 7. Drive mechanism; 71. First drive motor; 72. First bevel gear; 73. Second bevel gear; 74. First shaft; 75. First pulley; 76. Second pulley; 77. Transmission belt; 78. Third bevel gear; 79. Fourth bevel gear; 710. Second shaft;

[0063] 8. Second extrusion sleeve;

[0064] 9. Second extrusion chamber;

[0065] 101. Extrusion screw; 102. Second drive motor;

[0066] 111. Inner tube blank; 112. Intermediate skeleton layer; 113. Outer tube blank. Detailed Implementation

[0067] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0068] Please refer to Figure 1 The present invention relates to a method for preparing a high-toughness PE100RC gas pipe, comprising the following steps:

[0069] S1: Aromatic polyamide is subjected to ultraviolet irradiation treatment in the molten state for 5-7 hours and then extruded and granulated to obtain modified aromatic polyamide masterbatch;

[0070] S2: Extruding inner layer preform 111, wherein the inner layer preform 111 is prepared from the following raw materials in parts by weight: 30-40 parts HDPE resin, 60-70 parts MDPE, 15-20 parts polyamide-polyolefin block copolymer, 12-15 parts POE toughening agent, 6-10 parts coconut shell fiber and 30-45 parts modified aromatic polyamide masterbatch;

[0071] S3: A spiral intermediate skeleton layer 112 is extruded on the outside of the inner tube blank 111. The intermediate skeleton layer 112 is prepared from the following raw materials in parts by weight: 16-18 parts MDPE, 6-7 parts glass fiber, 0.5-1 parts titanium dioxide and 0.5-1 parts tungsten dioxide.

[0072] S4: An outer tube blank 113 is extruded on the outside of the inner tube blank 111 and the intermediate skeleton layer 112. The outer tube blank 113 is prepared from the following raw materials in parts by weight: 30-40 parts HDPE resin, 60-70 parts MDPE, 1-2 parts UV stabilizer, 0.5-2 parts POE toughening agent, 8-12 parts dioctyl phthalate, 4-6 parts cyclohexanone, 3-9 parts coumarone resin, 5-9 parts melamine, 4-8 parts chlorinated paraffin, 3-7 parts methacrylic acid, 3-8 parts titanium dioxide, 3-6 parts sisal fiber, and 3-6 parts bamboo fiber.

[0073] Figure 2 A cross-sectional view of the PE100RC gas pipe prepared by the above method.

[0074] The fabricated PE gas pipe structure comprises an inner layer, a middle skeleton layer, and an outer layer. The middle skeleton layer is made of MDPE and glass fiber, with titanium dioxide and tungsten dioxide incorporated to provide structural support for the pipe and to offer excellent toughness and pressure resistance. Because the spiral structure of the middle skeleton resembles a spring, it does not significantly affect the overall flexibility of the pipe. The inner and outer layers are primarily composed of HDPE and MDPE mixed in a specific ratio, further enhancing the pipe's flexibility. The inner layer incorporates UV-modified aromatic polyamide masterbatch, providing excellent corrosion resistance and flame retardancy, delaying PE pipe aging, and strengthening the pipe. The outer layer incorporates sisal fiber and bamboo fiber, further improving the pipe's strength and corrosion resistance.

[0075] Preferably, the helical pitch of the intermediate skeleton layer 112 is 7-9 cm.

[0076] Preferably, the above-mentioned high-toughness PE100RC gas pipe preparation method is based on an extrusion device, the extrusion device comprising:

[0077] frame;

[0078] An extrusion spindle 1 is rotatably connected to a frame, and a first helical section 11 is connected to the side of the extrusion spindle 1.

[0079] A central mold 2 is connected to the frame. The central mold 2 is a rotating body, and its axis coincides with the axis of the extrusion spindle 1.

[0080] A first extrusion sleeve 3 is connected to the frame and is fitted around the outside of the extrusion spindle 1. A first extrusion chamber 4 is formed between the front section of the first extrusion sleeve 3 and the extrusion spindle 1, and an annular extrusion die cavity is formed between the rear section of the first extrusion sleeve 3 and the central mold 2. A rotating sleeve 5 is coaxially and rotatably connected to the outside of the first extrusion sleeve 3. The rear section of the rotating sleeve 5 extends to the rear of the first extrusion sleeve 3 in the extrusion direction. The inner diameter of the rear section of the rotating sleeve 5 is the same as the diameter of the rear section of the first extrusion sleeve 3. An extrusion die cavity is formed between the rear section of the rotating sleeve 5 and the central mold 2. An annular channel 51 is provided inside the rotating sleeve 5, and the annular channel 51 communicates with the outer circumferential surface of the rotating sleeve 5. An extrusion channel 52 communicating with the inner wall of the rear section of the rotating sleeve 5 is connected to the annular channel 51. A second spiral portion 53 is provided on the outer wall of the rotating sleeve 5.

[0081] The annular rotary connecting part 6 is rotaryly and sealingly connected to the annular channel 51 of the rotary sleeve 5, and the annular connecting part is connected to the feed pipe 61;

[0082] The drive mechanism 7 is connected to the extrusion spindle 1 and the rotating sleeve 5 for driving the extrusion spindle 1 and the rotating sleeve 5 to rotate.

[0083] The second extrusion sleeve 8 is connected to the frame and coaxially sleeved on the outside of the rotating sleeve 5. A second extrusion chamber 9 is formed between the second extrusion sleeve 8 and the rotating sleeve 5. The rear section of the second extrusion sleeve 8 extends to the rear of the rear section of the rotating sleeve 5 in the extrusion direction. An extrusion die cavity is formed between the rear section of the second extrusion sleeve 8 and the central mold 2. The inner diameter of the rear section of the second extrusion sleeve 8 is larger than the inner diameter of the rear section of the first extrusion sleeve 3.

[0084] In the preparation method:

[0085] S2 specifically involves: the raw materials of the inner tube blank 111 are mixed evenly and melted, then fed into the first extrusion chamber 4 to extrude the inner tube blank 111;

[0086] S3 specifically involves: mixing the intermediate layer skeleton material evenly, melting it, and then feeding it into the annular channel 51 through the feed pipe 61. Under pressure, the material is extruded into the extrusion channel 52. During the uniform extrusion process of the inner layer tube blank 111, the rotating sleeve 5 is controlled to rotate continuously at a uniform speed, so that the intermediate layer skeleton material is extruded into the outer side of the inner layer tube blank 111 in a spiral shape.

[0087] S4 specifically involves: mixing the outer tube blank 113 raw material evenly, melting it, and then feeding it into the second extrusion chamber 9. Under the rotation of the rotating sleeve 5, the second spiral part 53 extrudes the raw material in the second extrusion chamber 9 to the outside of the inner tube blank 111 and the intermediate skeleton layer 112.

[0088] In the above scheme, the extrusion equipment corresponding to the extrusion method is ingeniously designed with structures such as extrusion spindle 1, central mold 2, first extrusion sleeve 3, rotating sleeve 5, and second extrusion sleeve 8. In particular, the structure of rotating sleeve 5 is designed. By utilizing the rotation of rotating sleeve 5, a spiral intermediate skeleton layer 112 structure is extruded on the surface of inner tube blank 111 during the extrusion process of inner tube blank 111. And through the second spiral part 53 structure outside rotating sleeve 5, the extrusion of outer tube blank 113 is realized.

[0089] Preferably, in the extrusion equipment, the drive mechanism 7 includes a first drive motor 71, a first bevel gear 72, a second bevel gear 73, a first rotating shaft 74, a first pulley 75, a second pulley 76, a transmission belt 77, a third bevel gear 78, a fourth bevel gear 79, and a second rotating shaft 710.

[0090] The first drive motor 71 is connected to the extrusion main shaft 1 for transmission; the first bevel gear 72 is coaxially sleeved on the extrusion main shaft 1; the first rotating shaft 74 is connected to the frame through a bearing and is perpendicular to the extrusion main shaft 1; the second bevel gear 73 is coaxially connected to the first rotating shaft 74 and meshes with the first bevel gear 72; the first pulley 75 is coaxially connected to the first rotating shaft 74; and the third bevel gear 78 is coaxially sleeved on the rotating sleeve 5.

[0091] The second rotating shaft 710 is connected to the frame via a main bearing. The second rotating shaft 710 is perpendicular to the extrusion main shaft 1. The fourth bevel gear 79 is coaxially connected to the second rotating shaft 710. The fourth bevel gear 79 meshes with the third bevel gear 78. The second pulley 76 is coaxially connected to the second rotating shaft 710. The transmission belt 77 is drivingly connected to the first pulley 75 and the second pulley 76.

[0092] Preferably, in the extrusion equipment, the feed pipe 61 is provided with an extrusion screw 101, and the extrusion screw 101 is connected to a second drive motor 102.

[0093] Preferably, in S1, the wavelength of the ultraviolet light is 0.03-0.1 μm.

[0094] Example 1

[0095] A method for preparing a high-toughness PE100RC gas pipe, based on an extrusion device, the extrusion device comprising:

[0096] frame;

[0097] An extrusion spindle is rotatably connected to a frame, and a first helical section is connected to the side of the extrusion spindle;

[0098] A central die, which is connected to the frame, is a rotating body, and its axis coincides with the axis of the extrusion spindle;

[0099] The first extrusion sleeve is connected to the frame and is sleeved on the outside of the extrusion main shaft. The front section of the first extrusion sleeve forms a first extrusion chamber with the extrusion main shaft, and the rear section of the first extrusion sleeve forms an annular extrusion die cavity with the central die.

[0100] A rotating sleeve is coaxially and rotatably connected to the outside of a first extrusion sleeve. The rear section of the rotating sleeve extends to the rear of the first extrusion sleeve in the extrusion direction. The inner diameter of the rear section of the rotating sleeve is the same as the diameter of the rear section of the first extrusion sleeve. An extrusion cavity is formed between the rear section of the rotating sleeve and the central die. An annular channel is provided inside the rotating sleeve, and the annular channel communicates with the outer circumferential surface of the rotating sleeve. An extrusion channel communicating with the inner wall of the rear section of the rotating sleeve is connected to the annular channel. A second spiral portion is provided on the outer wall of the rotating sleeve.

[0101] An annular rotary connecting part is rotary sealed to the annular channel portion of the rotary sleeve, and the annular connecting part is connected to a feed pipe;

[0102] A drive mechanism is connected to the extrusion spindle and the rotating sleeve for driving the extrusion spindle and the rotating sleeve to rotate.

[0103] The second extrusion sleeve is connected to the frame and coaxially sleeved around the outside of the rotating sleeve, forming a second extrusion chamber between the second extrusion sleeve and the rotating sleeve; the rear section of the second extrusion sleeve extends to the rear of the rear section of the rotating sleeve in the extrusion direction, and an extrusion die cavity is formed between the rear section of the second extrusion sleeve and the central die, and the inner diameter of the rear section of the second extrusion sleeve is larger than the inner diameter of the rear section of the first extrusion sleeve;

[0104] The drive mechanism includes a first drive motor, a first bevel gear, a second bevel gear, a first rotating shaft, a first pulley, a second pulley, a transmission belt, a third bevel gear, a fourth bevel gear, and a second rotating shaft;

[0105] The first drive motor is connected to the extrusion main shaft, the first bevel gear is coaxially sleeved on the extrusion main shaft, the first rotating shaft is connected to the frame through a bearing, the first rotating shaft is perpendicular to the extrusion main shaft, the second bevel gear is coaxially connected to the first rotating shaft, the second bevel gear meshes with the first bevel gear, and the first pulley is coaxially connected to the first rotating shaft;

[0106] The third bevel gear is coaxially sleeved on the rotating sleeve;

[0107] The second rotating shaft is connected to the frame via a main bearing and is perpendicular to the extrusion main shaft. The fourth bevel gear is coaxially connected to the second rotating shaft and meshes with the third bevel gear. The second pulley is coaxially connected to the second rotating shaft, and the transmission belt is connected to the first pulley and the second pulley.

[0108] The feed pipe is equipped with an extrusion screw, and the extrusion screw is driven by a second drive motor.

[0109] The preparation method includes the following steps:

[0110] S1: Aromatic polyamide was subjected to ultraviolet irradiation in the molten state for 6 hours and then extruded and granulated to obtain modified aromatic polyamide masterbatch; the wavelength of the ultraviolet light was 0.05 μm;

[0111] S2: The inner layer tube blank raw materials are mixed evenly, melted, and then fed into the first extrusion chamber to extrude the inner layer tube blank. The inner layer tube blank is prepared from the following raw materials in parts by weight: 35 parts HDPE resin, 65 parts MDPE, 17 parts polyamide-polyolefin block copolymer, 13 parts POE toughening agent, 8 parts coconut shell fiber, and 40 parts modified aromatic polyamide masterbatch.

[0112] S3: The intermediate layer skeleton material is mixed evenly and melted, then fed into the annular channel through the feed pipe and extruded into the extrusion channel under pressure. During the uniform extrusion of the inner layer tube blank, the rotating sleeve is controlled to rotate continuously at a uniform speed, so that the intermediate layer skeleton material is extruded into the outer side of the inner layer tube blank in a spiral shape. The intermediate skeleton layer is prepared from the following parts by weight of raw materials: 17 parts MDPE, 6.5 parts glass fiber, 0.8 parts titanium dioxide and 0.7 parts tungsten dioxide.

[0113] S4: Mix the outer layer tube blank raw materials evenly, melt them, and then put them into the second extrusion chamber. Under the rotation of the rotating sleeve, the second spiral part extrudes the raw materials in the second extrusion chamber to the outside of the inner layer tube blank and the middle skeleton layer. The outer layer tube blank is prepared from the following raw materials in parts by weight: 35 parts HDPE resin, 65 parts MDPE, 1.5 parts UV stabilizer, 1 part POE toughening agent, 10 parts dioctyl phthalate, 5 parts cyclohexanone, 6 parts coumarone resin, 7 parts melamine, 6 parts chlorinated paraffin, 5 parts methacrylic acid, 5 parts titanium dioxide, 4.5 parts sisal fiber, and 4.5 parts bamboo fiber.

[0114] Example 2

[0115] A method for preparing a high-toughness PE100RC gas pipe, based on an extrusion device, the extrusion device comprising:

[0116] frame;

[0117] An extrusion spindle is rotatably connected to a frame, and a first helical section is connected to the side of the extrusion spindle;

[0118] A central die, which is connected to the frame, is a rotating body, and its axis coincides with the axis of the extrusion spindle;

[0119] The first extrusion sleeve is connected to the frame and is sleeved on the outside of the extrusion main shaft. The front section of the first extrusion sleeve forms a first extrusion chamber with the extrusion main shaft, and the rear section of the first extrusion sleeve forms an annular extrusion die cavity with the central die.

[0120] A rotating sleeve is coaxially and rotatably connected to the outside of a first extrusion sleeve. The rear section of the rotating sleeve extends to the rear of the first extrusion sleeve in the extrusion direction. The inner diameter of the rear section of the rotating sleeve is the same as the diameter of the rear section of the first extrusion sleeve. An extrusion cavity is formed between the rear section of the rotating sleeve and the central die. An annular channel is provided inside the rotating sleeve, and the annular channel communicates with the outer circumferential surface of the rotating sleeve. An extrusion channel communicating with the inner wall of the rear section of the rotating sleeve is connected to the annular channel. A second spiral portion is provided on the outer wall of the rotating sleeve.

[0121] An annular rotary connecting part is rotary sealed to the annular channel portion of the rotary sleeve, and the annular connecting part is connected to a feed pipe;

[0122] A drive mechanism is connected to the extrusion spindle and the rotating sleeve for driving the extrusion spindle and the rotating sleeve to rotate.

[0123] The second extrusion sleeve is connected to the frame and coaxially sleeved around the outside of the rotating sleeve, forming a second extrusion chamber between the second extrusion sleeve and the rotating sleeve; the rear section of the second extrusion sleeve extends to the rear of the rear section of the rotating sleeve in the extrusion direction, and an extrusion die cavity is formed between the rear section of the second extrusion sleeve and the central die, and the inner diameter of the rear section of the second extrusion sleeve is larger than the inner diameter of the rear section of the first extrusion sleeve;

[0124] The drive mechanism includes a first drive motor, a first bevel gear, a second bevel gear, a first rotating shaft, a first pulley, a second pulley, a transmission belt, a third bevel gear, a fourth bevel gear, and a second rotating shaft;

[0125] The first drive motor is connected to the extrusion main shaft, the first bevel gear is coaxially sleeved on the extrusion main shaft, the first rotating shaft is connected to the frame through a bearing, the first rotating shaft is perpendicular to the extrusion main shaft, the second bevel gear is coaxially connected to the first rotating shaft, the second bevel gear meshes with the first bevel gear, and the first pulley is coaxially connected to the first rotating shaft;

[0126] The third bevel gear is coaxially sleeved on the rotating sleeve;

[0127] The second rotating shaft is connected to the frame via a main bearing and is perpendicular to the extrusion main shaft. The fourth bevel gear is coaxially connected to the second rotating shaft and meshes with the third bevel gear. The second pulley is coaxially connected to the second rotating shaft, and the transmission belt is connected to the first pulley and the second pulley.

[0128] The feed pipe is equipped with an extrusion screw, and the extrusion screw is driven by a second drive motor.

[0129] The preparation method includes the following steps:

[0130] S1: Aromatic polyamide was subjected to ultraviolet irradiation in the molten state for 5 hours and then extruded and granulated to obtain modified aromatic polyamide masterbatch; the wavelength of the ultraviolet light was 0.03 μm;

[0131] S2: The inner layer tube blank raw materials are mixed evenly, melted, and then fed into the first extrusion chamber to extrude the inner layer tube blank. The inner layer tube blank is prepared from the following raw materials in parts by weight: 30 parts HDPE resin, 60 parts MDPE, 15 parts polyamide-polyolefin block copolymer, 12 parts POE toughening agent, 6 parts coconut shell fiber, and 30 parts modified aromatic polyamide masterbatch.

[0132] S3: Mix the intermediate layer skeleton material evenly, melt it, and then pass it into the annular channel through the feed pipe. Under pressure, it is extruded into the extrusion channel. During the uniform extrusion of the inner layer tube blank, the rotating sleeve is controlled to rotate continuously at a uniform speed, so that the intermediate layer skeleton material is extruded into the outer side of the inner layer tube blank in a spiral shape. The intermediate skeleton layer is prepared from the following parts by weight of raw materials: 16 parts MDPE, 6 parts glass fiber, 0.5 parts titanium dioxide and 0.5 parts tungsten dioxide.

[0133] S4: Mix the outer layer tube blank raw materials evenly, melt them, and put them into the second extrusion chamber. Under the rotation of the rotating sleeve, the second spiral part extrudes the raw materials in the second extrusion chamber to the outside of the inner layer tube blank and the middle skeleton layer. The outer layer tube blank is made of the following raw materials in parts by weight: 30 parts HDPE resin, 60 parts MDPE, 1 part UV stabilizer, 0.5 parts POE toughening agent, 8 parts dioctyl phthalate, 4 parts cyclohexanone, 3 parts coumarone resin, 5 parts melamine, 4 parts chlorinated paraffin, 3 parts methacrylic acid, 3 parts titanium dioxide, 3 parts sisal fiber, and 3 parts bamboo fiber.

[0134] Example 3

[0135] A method for preparing a high-toughness PE100RC gas pipe, based on an extrusion device, the extrusion device comprising:

[0136] frame;

[0137] An extrusion spindle is rotatably connected to a frame, and a first helical section is connected to the side of the extrusion spindle;

[0138] A central die, which is connected to the frame, is a rotating body, and its axis coincides with the axis of the extrusion spindle;

[0139] The first extrusion sleeve is connected to the frame and is sleeved on the outside of the extrusion main shaft. The front section of the first extrusion sleeve forms a first extrusion chamber with the extrusion main shaft, and the rear section of the first extrusion sleeve forms an annular extrusion die cavity with the central die.

[0140] A rotating sleeve is coaxially and rotatably connected to the outside of a first extrusion sleeve. The rear section of the rotating sleeve extends to the rear of the first extrusion sleeve in the extrusion direction. The inner diameter of the rear section of the rotating sleeve is the same as the diameter of the rear section of the first extrusion sleeve. An extrusion cavity is formed between the rear section of the rotating sleeve and the central die. An annular channel is provided inside the rotating sleeve, and the annular channel communicates with the outer circumferential surface of the rotating sleeve. An extrusion channel communicating with the inner wall of the rear section of the rotating sleeve is connected to the annular channel. A second spiral portion is provided on the outer wall of the rotating sleeve.

[0141] An annular rotary connecting part is rotary sealed to the annular channel portion of the rotary sleeve, and the annular connecting part is connected to a feed pipe;

[0142] A drive mechanism is connected to the extrusion spindle and the rotating sleeve for driving the extrusion spindle and the rotating sleeve to rotate.

[0143] The second extrusion sleeve is connected to the frame and coaxially sleeved around the outside of the rotating sleeve, forming a second extrusion chamber between the second extrusion sleeve and the rotating sleeve; the rear section of the second extrusion sleeve extends to the rear of the rear section of the rotating sleeve in the extrusion direction, and an extrusion die cavity is formed between the rear section of the second extrusion sleeve and the central die, and the inner diameter of the rear section of the second extrusion sleeve is larger than the inner diameter of the rear section of the first extrusion sleeve;

[0144] The drive mechanism includes a first drive motor, a first bevel gear, a second bevel gear, a first rotating shaft, a first pulley, a second pulley, a transmission belt, a third bevel gear, a fourth bevel gear, and a second rotating shaft;

[0145] The first drive motor is connected to the extrusion main shaft, the first bevel gear is coaxially sleeved on the extrusion main shaft, the first rotating shaft is connected to the frame through a bearing, the first rotating shaft is perpendicular to the extrusion main shaft, the second bevel gear is coaxially connected to the first rotating shaft, the second bevel gear meshes with the first bevel gear, and the first pulley is coaxially connected to the first rotating shaft;

[0146] The third bevel gear is coaxially sleeved on the rotating sleeve;

[0147] The second rotating shaft is connected to the frame via a main bearing and is perpendicular to the extrusion main shaft. The fourth bevel gear is coaxially connected to the second rotating shaft and meshes with the third bevel gear. The second pulley is coaxially connected to the second rotating shaft, and the transmission belt is connected to the first pulley and the second pulley.

[0148] The feed pipe is equipped with an extrusion screw, and the extrusion screw is driven by a second drive motor.

[0149] The preparation method includes the following steps:

[0150] S1: Aromatic polyamide was subjected to ultraviolet irradiation in the molten state for 7 hours and then extruded and granulated to obtain modified aromatic polyamide masterbatch; the wavelength of the ultraviolet light was 0.1 μm;

[0151] S2: The inner layer tube blank raw materials are mixed evenly, melted, and then fed into the first extrusion chamber to extrude the inner layer tube blank. The inner layer tube blank is prepared from the following raw materials in parts by weight: 40 parts HDPE resin, 70 parts MDPE, 20 parts polyamide-polyolefin block copolymer, 15 parts POE toughening agent, 10 parts coconut shell fiber, and 45 parts modified aromatic polyamide masterbatch.

[0152] S3: Mix the intermediate layer skeleton material evenly, melt it, and then pass it into the annular channel through the feed pipe. Under pressure, it is extruded into the extrusion channel. During the uniform extrusion of the inner layer tube blank, the rotating sleeve is controlled to rotate continuously at a uniform speed, so that the intermediate layer skeleton material is extruded into the outer side of the inner layer tube blank in a spiral shape. The intermediate skeleton layer is prepared from the following parts by weight of raw materials: 18 parts MDPE, 7 parts glass fiber, 1 part titanium dioxide and 0.5-1 part tungsten dioxide.

[0153] S4: Mix the outer layer tube blank raw materials evenly, melt them, and put them into the second extrusion chamber. Under the rotation of the rotating sleeve, the second spiral part extrudes the raw materials in the second extrusion chamber to the outside of the inner layer tube blank and the middle skeleton layer. The outer layer tube blank is prepared from the following raw materials in parts by weight: 40 parts HDPE resin, 70 parts MDPE, 2 parts UV stabilizer, 2 parts POE toughening agent, 12 parts dioctyl phthalate, 6 parts cyclohexanone, 9 parts coumarone resin, 9 parts melamine, 8 parts chlorinated paraffin, 7 parts methacrylic acid, 8 parts titanium dioxide, 6 parts sisal fiber, and 6 parts bamboo fiber.

[0154] Comparative Example 1

[0155] Based on Example 1, the intermediate skeleton layer is omitted.

[0156] Comparative Example 2

[0157] Based on Example 1, the outer tube blank raw materials omit sisal fiber and bamboo fiber.

[0158] Comparative Example 3

[0159] Based on Example 1, sisal fiber was omitted from the raw material of the outer tube blank.

[0160] Comparative Example 4

[0161] Based on Example 1, 35 parts HDPE resin and 65 parts MDPE were replaced with 100 parts HDPE.

[0162] Comparative Example 5

[0163] Based on Example 1, 35 parts HDPE resin and 65 parts MDPE were replaced with 100 parts HDPE.

[0164] Comparative Example 6

[0165] Based on Example 1, the addition of modified aromatic polyamide masterbatch is omitted in S1 and S2.

[0166] Experimental Example

[0167] The performance of the gas pipes prepared in Examples 1-3 and Comparative Examples 1-6 was tested.

[0168] The experimental results are shown in Table 1:

[0169] Table 1

[0170]

[0171]

[0172] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for preparing a high-toughness PE100RC gas pipe, characterized in that, Includes the following steps: S1: Aromatic polyamide is subjected to ultraviolet irradiation treatment in the molten state for 5-7 hours and then extruded and granulated to obtain modified aromatic polyamide masterbatch; S2: Extruding inner layer preform, the inner layer preform is prepared from the following raw materials in parts by weight: 30-40 parts HDPE resin, 60-70 parts MDPE, 15-20 parts polyamide-polyolefin block copolymer, 12-15 parts POE toughening agent, 6-10 parts coconut shell fiber and 30-45 parts modified aromatic polyamide masterbatch. S3: A spiral intermediate skeleton layer is extruded on the outside of the inner tube blank. The intermediate skeleton layer is prepared from the following raw materials in parts by weight: 16-18 parts MDPE, 6-7 parts glass fiber, 0.5-1 parts titanium dioxide and 0.5-1 parts tungsten dioxide. S4: An outer tube blank is extruded on the outside of the inner tube blank and the intermediate skeleton layer. The outer tube blank is prepared from the following raw materials in parts by weight: 30-40 parts HDPE resin, 60-70 parts MDPE, 1-2 parts UV stabilizer, 0.5-2 parts POE toughening agent, 8-12 parts dioctyl phthalate, 4-6 parts cyclohexanone, 3-9 parts coumarone resin, 5-9 parts melamine, 4-8 parts chlorinated paraffin, 3-7 parts methacrylic acid, 3-8 parts titanium dioxide, 3-6 parts sisal fiber, and 3-6 parts bamboo fiber.

2. The method for preparing the high-toughness PE100RC gas pipe according to claim 1, characterized in that, The pitch of the intermediate skeleton layer is 7-9 cm.

3. The method for preparing the high-toughness PE100RC gas pipe according to claim 1, characterized in that, Based on the extrusion equipment, the extrusion equipment includes: frame; An extrusion spindle is rotatably connected to a frame, and a first helical section is connected to the side of the extrusion spindle; A central die, which is connected to the frame, is a rotating body, and its axis coincides with the axis of the extrusion spindle; The first extrusion sleeve is connected to the frame and is sleeved on the outside of the extrusion main shaft. The front section of the first extrusion sleeve forms a first extrusion chamber with the extrusion main shaft, and the rear section of the first extrusion sleeve forms an annular extrusion die cavity with the central die. A rotating sleeve is coaxially and rotatably connected to the outside of a first extrusion sleeve. The rear section of the rotating sleeve extends to the rear of the first extrusion sleeve in the extrusion direction. The inner diameter of the rear section of the rotating sleeve is the same as the diameter of the rear section of the first extrusion sleeve. An extrusion cavity is formed between the rear section of the rotating sleeve and the central die. An annular channel is provided inside the rotating sleeve, and the annular channel communicates with the outer circumferential surface of the rotating sleeve. An extrusion channel communicating with the inner wall of the rear section of the rotating sleeve is connected to the annular channel. A second spiral portion is provided on the outer wall of the rotating sleeve. An annular rotary connecting part is rotary sealed to the annular channel portion of the rotary sleeve, and the annular connecting part is connected to a feed pipe; A drive mechanism is connected to the extrusion spindle and the rotating sleeve for driving the extrusion spindle and the rotating sleeve to rotate. The second extrusion sleeve is connected to the frame and coaxially sleeved on the outside of the rotating sleeve, forming a second extrusion chamber between the second extrusion sleeve and the rotating sleeve; the rear section of the second extrusion sleeve extends to the rear of the rear section of the rotating sleeve in the extrusion direction, and the rear section of the second extrusion sleeve forms an extrusion die cavity with the central die, and the inner diameter of the rear section of the second extrusion sleeve is larger than the inner diameter of the rear section of the first extrusion sleeve. In the preparation method: S2 specifically involves: the inner tube blank raw materials are mixed evenly, melted, and then fed into the first extrusion chamber to extrude the inner tube blank; S3 specifically involves: mixing the intermediate layer skeleton material evenly, melting it, and then feeding it into the annular channel through the feed pipe. Under pressure, the material is then extruded into the extrusion channel. During the uniform extrusion of the inner layer tube blank, the rotating sleeve is controlled to rotate continuously at a uniform speed, so that the intermediate layer skeleton material is extruded into the outer side of the inner layer tube blank in a spiral shape. S4 specifically involves: mixing the outer tube blank raw material evenly, melting it, and then feeding it into the second extrusion chamber. Under the rotation of the rotating sleeve, the second spiral part extrudes the raw material in the second extrusion chamber to the outside of the inner tube blank and the intermediate skeleton layer.

4. The method for preparing the high-toughness PE100RC gas pipe according to claim 3, characterized in that, In the extrusion equipment, the drive mechanism includes a first drive motor, a first bevel gear, a second bevel gear, a first rotating shaft, a first pulley, a second pulley, a transmission belt, a third bevel gear, a fourth bevel gear, and a second rotating shaft; The first drive motor is connected to the extrusion main shaft, the first bevel gear is coaxially sleeved on the extrusion main shaft, the first rotating shaft is connected to the frame through a bearing, the first rotating shaft is perpendicular to the extrusion main shaft, the second bevel gear is coaxially connected to the first rotating shaft, the second bevel gear meshes with the first bevel gear, and the first pulley is coaxially connected to the first rotating shaft; The third bevel gear is coaxially sleeved on the rotating sleeve; The second rotating shaft is connected to the frame via a main bearing and is perpendicular to the extrusion main shaft. The fourth bevel gear is coaxially connected to the second rotating shaft and meshes with the third bevel gear. The second pulley is coaxially connected to the second rotating shaft, and the transmission belt is connected to the first pulley and the second pulley.

5. The method for preparing the high-toughness PE100RC gas pipe according to claim 3, characterized in that, In the extrusion equipment, an extrusion screw is provided inside the feed pipe, and the extrusion screw is driven by a second drive motor.

6. The method for preparing the high-toughness PE100RC gas pipe according to claim 1, characterized in that, In S1, the wavelength of the ultraviolet light is 0.03-0.1 μm.

7. A gas pipe prepared by the method of preparing high-toughness PE100RC gas pipe according to any one of claims 1 to 6.

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