Flame-retardant PE communication pipe and preparation system thereof

Abstract

The invention discloses a flame-retardant PE communication tube and a preparation system thereof, and particularly relates to a polyethylene tube, the flame-retardant PE communication tube comprises the PE tube prepared from the following raw materials in parts by weight: 55-68 parts of matrix resin, 22-33 parts of magnesium hydroxide, 3-5 parts of silicone resin, 0.3-0.5 part of an antioxidant, 6-9 parts of expanded graphite, 0.6-0.9 part of a lubricant and 1-10 parts of color master particles, and the outer layer of the PE tube is covered with a wire weaving part. The wire rod weaving part is composed of PSA flame-retardant wire rods. The outer layer of the PE pipe with the flame-retardant effect is provided with the wire weaving part, and the wire weaving part is composed of the flame-retardant, heat-insulating and supporting PSA flame-retardant wires, so that the supporting capacity is provided for the PE pipe, a cable in the PE pipe is protected, appearance supporting of the PE pipe can be assisted when the PE pipe is molten when meeting open fire, and diffusion of the open fire is further reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of polyethylene pipes, and in particular to a flame-retardant PE communication pipe and a preparation system thereof. Background Art

[0002] Flame-retardant PE communication pipe is made of PE (polyethylene) as the main material, with flame-retardant materials and other additives added. It can effectively suppress the spread of fire when encountering open flames and is widely used in home decoration, factories and other occasions.

[0003] Patent number CN116554584A, published (announced) on August 8, 2023, discloses a flame-retardant PE communication pipe and its preparation method. The pipe comprises the following raw materials by weight: 80-100 parts polyethylene resin, 10-30 parts functional masterbatch, 1-3 parts compatibilizer, 0.5-2 parts antioxidant, 2-5 parts lubricant, and 0.1-1 parts thermal stabilizer. The functional masterbatch is made from a functional polymer material, a flame retardant, and a synergistic flame retardant. The purpose is to impart excellent flame retardancy and mechanical properties to the PE communication pipe, making it adaptable to various environments.

[0004] According to patent number CN116175933A, publication (announcement) date: 2023-05-30, a cooling device for a plastic corrugated pipe extruder is disclosed, wherein a first cooling cavity is provided in the thickness direction of the first mold assembly, at least one first liquid filling port is provided at the top of the first cooling cavity, and at least one first liquid outlet is provided in the middle and / or lower part of the first cooling cavity; the first filling assembly includes at least one first filling port, and the first filling port is provided corresponding to the first liquid filling port; the cooling device for a plastic corrugated pipe extruder provided by the present invention fills all the first cooling cavities through the first filling assembly, thereby simplifying the structural complexity of the first filling assembly; the process of gradual heat exchange of the coolant is continuously carried out just after it enters the first mold assembly; in the basic molding process of the plastic corrugated pipe, the temperature difference between the first mold assembly and the plastic in the melted state will not be too large, thereby ensuring the molding quality of the plastic corrugated pipe.

[0005] In the existing technologies including the above-mentioned patents, flame-retardant PE communication pipes have good flame-retardant effects, and their own materials are relatively soft and easy to bend. However, when they are made into corrugated pipes to increase strength, their supporting capacity is still limited. When they are pulled in PP pipes for interior decoration that require flame-retardant functions, or when they are used to bundle cables in mobile devices, the internal cables will still be damaged due to insufficient supporting force. Summary of the Invention

[0006] The purpose of the present invention is to provide a flame-retardant PE communication pipe and a preparation system thereof, aiming to solve the above-mentioned problems.

[0007] In order to achieve the above-mentioned purpose, the present invention provides the following technical solution: a flame-retardant PE communication pipe and its preparation system, comprising a PE pipe made of the following raw materials by weight: 55-68 parts of base resin, 22-33 parts of magnesium hydroxide, 3-5 parts of silicone resin, 0.3-0.5 parts of antioxidant, 6-9 parts of expanded graphite, 0.6-0.9 parts of lubricant, and 1-10 parts of masterbatch, wherein the outer layer of the PE pipe is covered with a wire braided portion, and the wire braided portion is composed of PSA flame-retardant wire.

[0008] A flame-retardant PE communication pipe preparation system, which is used for the flame-retardant PE communication pipe described above, includes a screw extruder for melting raw materials and extruding PE pipes, and also includes: A winding assembly includes a rotating cover on which a wire coil is provided, and the wire coil rotates to wind the PSA flame-retardant wire material onto the PE pipe; The molding and cooling mechanism comprises two groups of molding blocks that move in a waist-circular trajectory. A cooling channel is opened in the molding blocks. The two cooling channels are connected by the two molding blocks fitting PE pipes to form an annular circulation channel.

[0009] Preferably, the molding cooling mechanism further comprises a cold water pool, and the first end of the molding block is fixedly connected to a water collecting block submerged in the liquid surface, and the water collecting block moves with the molding block to supply water to the circulation channel.

[0010] Preferably, the cold water tank is provided with a first water outlet unit, which discharges water along the central axis of the liquid surface, so that the water flows along two groups of opposite water receiving blocks.

[0011] Preferably, the rotating cover is provided with conducting rods in a circumferential array, and the conducting rods are rotatably connected to fixed sleeves.

[0012] Preferably, a partition plate is provided in the cooling channel to separate the circulation channel into an outer channel and an inner channel, and liquid flows in the outer channel and the inner channel.

[0013] Preferably, a notch is provided on the partition plate in one of the cooling channels, and a blocking partition plate and a guide plate are symmetrically and alternately arranged on the notch along the central axis of the partition plate.

[0014] Preferably, a water outlet channel connected to the outer channel is provided on the second end of the forming block, and a one-way movable elastic paddle is provided on the water outlet channel.

[0015] Preferably, water inlets connected to the water collecting block are symmetrically opened at the first end of the cooling channel, and a limiting plate is provided on one of the water inlets.

[0016] Preferably, the forming and cooling mechanism further comprises a driving belt for carrying the forming blocks and a fixing plate for limiting the forming blocks, and a driving disk is coupled to the driving belt for transmission.

[0017] In the above technical solution, the present invention provides a flame-retardant PE communication pipe and a preparation system thereof, which have the following beneficial effects: a wire braided portion is provided on the outer layer of the PE pipe with flame-retardant effect, and the wire braided portion is composed of flame-retardant, heat-insulating and supportive PSA flame-retardant wire to give the PE pipe supporting ability, thereby protecting the cable inside the PE pipe, and can assist in supporting the shape of the PE pipe when the PE pipe melts in the open flame, thereby further reducing the spread of the open flame. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 A schematic structural diagram of a preparation system provided in an embodiment of the present invention; Figure 2 A schematic diagram of the exploded structure of a winding assembly provided in an embodiment of the present invention; Figure 3 An exploded schematic diagram of a cold water tank and a winding assembly provided in an embodiment of the present invention; Figure 4 A schematic cross-sectional view of a preparation system according to an embodiment of the present invention; Figure 5 A schematic cross-sectional view from another angle of the preparation system provided by an embodiment of the present invention; Figure 6 for Figure 5 A in the middle is an enlarged schematic diagram; Figure 7 for Figure 5 The enlarged schematic diagram of point B in the middle; Figure 8 A schematic structural diagram of a molding cooling mechanism provided in an embodiment of the present invention; Figure 9 An exploded schematic diagram of a molding cooling mechanism provided by an embodiment of the present invention; Figure 10 A transparent schematic diagram of a forming block provided in an embodiment of the present invention; Figure 11 for Figure 10 Enlarged schematic diagram at point C in the middle; Figure 12 A schematic diagram of the cross-sectional structure of a PE pipe provided in an embodiment of the present invention.

[0020] Description of reference numerals: 1. Cold water tank; 11. First water outlet unit; 12. Second water outlet unit; 121. Oblique water outlet; 122. Water inlet; 20. PSA flame-retardant wire; 21. PE pipe; 211. Wire braiding part; 3. Molding cooling mechanism; 30. Slot; 301. Extension column; 31. Molding block; 310. Water inlet; 3101. Water outlet; 3102. Spacer; 311. Cooling channel; 312. Outer channel; 313. Inner channel; 314. Blocking partition; 315. Guide plate; 316. Elastic paddle; 317. Limiting plate; 32. Drive belt; 321. Drive disk; 322. Fixed plate; 33. Water collecting block; 331. Guide plate; 4. Winding assembly; 41. Rotating cover; 411. Conductor rod; 42. Fixed sleeve; 43. Wire reel. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0022] Example 1 like Figure 12 As shown, a flame-retardant PE communication pipe includes a PE pipe 21 made of the following raw materials by weight: 55-68 parts of base resin, 22-33 parts of sodium hydroxide, 3-5 parts of silicone resin, 0.3-0.5 parts of antioxidant, 6-9 parts of expanded graphite, 0.6-0.9 parts of lubricant, and 1-10 parts of masterbatch. The outer layer of the PE pipe 21 is covered with a wire braided portion 211, and the wire braided portion 211 is composed of PSA flame-retardant wire 20.

[0023] Specifically, the diameter of the PSA flame retardant wire 20 is 30 μm. PSA is specifically polyarylsulfone amide fiber. The PSA flame retardant wire 20 is wound on the PE tube 21 . The number of PSA flame retardant wires 20 wound is no less than 2.

[0024] In the above technical solution, a wire braided portion 211 is provided on the outer layer of the PE tube 21 having a flame retardant effect. The wire braided portion 211 is composed of flame retardant, heat-insulating and supportive PSA flame retardant wire 20 to provide support for the PE tube 21, thereby protecting the cables inside the PE tube 21. When the PE tube 21 melts in the event of an open flame, it can assist in supporting the outer shape of the PE tube 21, thereby further reducing the spread of the open flame.

[0025] Preparation of a flame-retardant PE communication pipe: S01. Material Preparation: Dry magnesium hydroxide and expanded graphite in an oven at 85°C-95°C for at least 4 hours, maintaining a moisture content of ≤0.1%. Coat the flame retardant with a silane coupling agent (KH-550) to improve compatibility, at a ratio of 1-2 wt% of the flame retardant. Dry the base resin (HDPE) in an oven at 50°C-60°C for 2 hours to reduce moisture. Premix the antioxidant, lubricant, and masterbatch according to the appropriate proportions.

[0026] S02. Mixing: Add the base resin (HDPE), flame retardant, antioxidant, lubricant, masterbatch and silicone resin into a high-speed mixer for mixing at a mixing temperature of 80°C to 90°C for 9 to 13 minutes.

[0027] S03. The mixed materials are melted and extruded into a PE tube 21 using a screw extruder (length-to-diameter ratio L / D = 32:1, compression ratio 2.8). After extrusion, the PSA flame-retardant wire 20 is wrapped around the PE tube 21 (the PSA flame-retardant wire 20 winding tension is 0.5-0.8 N). Finally, the PE tube 21 is formed and cooled by the forming and cooling mechanism 3.

[0028] Example 2 like Figure 1-11 As shown, a flame-retardant PE communication pipe preparation system includes a screw extruder for melting raw materials and extruding a PE pipe 21, and further includes: The winding assembly 4 includes a rotating cover 41 on which a wire reel 43 is provided. The wire reel 43 rotates to wind the PSA flame retardant wire 20 toward the PE tube 21. The forming and cooling mechanism 3 comprises two groups of forming blocks 31 that move in a waist-shaped trajectory. A cooling channel 311 is provided in the forming block 31. The two cooling channels 311 are connected by the two forming blocks 31 that are attached to the PE pipe 21 to form an annular circulation channel.

[0029] Specifically, a through hole is opened in the center of the rotating cover 41 for the PE tube 21 extruded by the screw extruder to pass through. The rotating cover 41 is driven by a motor to rotate, and the PSA flame retardant wire 20 is wound around the PE tube 21 to form a wire braided portion 211. However, the good heat insulation ability of the wire braided portion 211 will affect the cooling and forming of the PE tube 21 by the forming cooling mechanism 3. Subsequently, the PE tube 21 is fitted and clamped by the forming block 31 moving along the waist circle trajectory for shaping and cooling. The PE tube 21 can be shaped into a straight tube or a corrugated tube. During the clamping process, the cooling channels 311 in the two forming blocks 31 are docked to form a circulation channel. The liquid in the circulation channel flows to increase the cooling capacity of the PE tube 21 and the PSA flame retardant wire 20, and the PSA flame retardant wire 20 can be fitted while maintaining cooling and forming.

[0030] In the above technical solution, while the PE tube 21 is extruded and cooled by the forming block 31, the PSA flame-retardant wire 20 can also be fixed on the PE tube 21. The circulation channel formed by the cooling channel 311 promotes the circulation cooling of the liquid, thereby increasing the cooling capacity of the forming block 31 and fixing the PSA flame-retardant wire 20 with a certain thermal insulation capacity.

[0031] Furthermore, the forming and cooling mechanism 3 also includes a drive belt 32 for supporting the forming block 31 and a fixed plate 322 for limiting the forming block 31. The fixed plate 322 is fixedly mounted on the frame (the frame is constructed of aluminum alloy profiles or cast iron parts). The forming block 31 is provided with a slot 30, which is connected to the drive belt 32 via a fastener. The inner wall of the drive belt 32 is provided with raised teeth, which are coupled to the drive disk 321 for transmission. The drive disk 321 is connected to the output end of the reducer via a coupling. The fixed plate 322 is provided with a guide groove for a waist-shaped trajectory. The forming block 31 is symmetrically provided with extension columns 301. The two extension columns 301 are respectively limited by the guide grooves of the waist-shaped trajectory, thereby limiting the movement trajectory of the forming block 31.

[0032] As an embodiment provided by the present invention, the molding cooling mechanism 3 also includes a cold water pool 1. The first end of the molding block 31 is fixedly connected to a water collecting block 33 submerged in the liquid surface. The water collecting block 33 moves with the molding block 31 to supply water to the circulation channel.

[0033] Specifically, the first end of the forming block 31 (with Figure 5 For reference, the first end is the lower end) and a water collecting block 33 is provided. The liquid level of the cold water pool 1 is high enough to immerse the water collecting block 33 in the water as a whole. When the forming block 31 moves along the waist-circular trajectory, it will drive the water collecting block 33 to move in the water, thereby guiding the water in the cold water pool 1 into the circulation channel for flow circulation and replacement, thereby increasing the cooling rate of the forming block 31.

[0034] As an embodiment provided by the present invention, a first water outlet unit 11 is provided on the cold water pool 1 , and the first water outlet unit 11 discharges water along the central axis of the liquid surface, so that the water flows along two sets of opposite water receiving blocks 33 .

[0035] Specifically, a guide plate 331 extending from the water receiving block 33 is provided on the water receiving block 33. The first water outlet unit 11 is composed of a water pipe and a water pump. The water outlet of the water pump is arranged at the central axis of the two groups of forming blocks 31, and the water outlet is facing between the water receiving blocks 33. When started, the water pump outlet ejects water to promote water to enter the water receiving block 33 along the guide plate 331.

[0036] Furthermore, a second water outlet unit 12 is provided on the cold water pool 1. The second water outlet unit 12 also consists of a water pipe and a water pump. The second water outlet unit 12 is provided at the other end of the cold water pool 1. The water inlet 122 of the water pump of the second water outlet unit 12 faces the water outlet of the first water outlet unit 11. A plurality of inclined water outlets 121 are provided in a linear array on the water pipe of the second water outlet unit 12. The inclined water outlets 121 discharge water toward the central axis of the two groups of forming blocks 31, further increasing the amount of water entering the water receiving block 33.

[0037] As an embodiment provided by the present invention, the rotating cover 41 is provided with conductive rods 411 in a circumferential array, and the conductive rods 411 are rotatably connected to the fixed sleeves 42 .

[0038] Specifically, the number of conductor rods 411 corresponds to the number of wire coils 43, and the number of conductor rods 411 is not less than two. The wire coil 43 is rotatably connected to the rotating cover 41, and the fixed sleeve 42 is fixed on the frame. The rotating cover 41 is rotatably connected to the fixed sleeve 42 through the conductor rods 411, and the coupling wheel provided on the output end of the motor is engaged with the outer wall of the rotating cover 41 to drive the rotating cover 41 to rotate. When the PE tube 21 is extruded, the PSA flame retardant wire 20 is wound onto the PE tube 21.

[0039] As an embodiment provided by the present invention, a partition plate 3102 is provided in the cooling channel 311 to separate the circulation channel into an outer channel 312 and an inner channel 313 , and liquid flows in the outer channel 312 and the inner channel 313 .

[0040] Specifically, the circulation channel is divided into an outer channel 312 and an inner channel 313. The liquid entering the circulation channel enters from the lower end, so that the liquid (i.e., water) that first enters the circulation channel enters the outer channel 312 and the inner channel 313 respectively. The inner channel 313 is closer to the PE pipe 21 and heats up faster. As the liquid passes through the circulation channel, the liquid in the outer channel 312 and the inner channel 313 are exchanged, so that the heated liquid is discharged in time to increase the cooling capacity of the circulation channel.

[0041] Further, the forming block 31 (with Figure 6 The second end is provided with a water outlet 3101 connected to the outer channel 312 to facilitate the discharge of the heated water in the outer channel 312. The water outlet 3101 is provided with a one-way movable elastic plate 316. The elastic plate 316 is provided with a one-way movable elastic plate 316. Figure 6 For reference, it is flipped upwards so that the water in the outer channel 312 can push open the elastic paddle 316 for discharge and maintain the water pressure in the circulation channel. When the water pressure is not enough to push open the elastic paddle 316, it will not be discharged, ensuring that the water fills the entire circulation channel, and it is not easy to have gaps due to air flow backflow, thereby avoiding cooling temperature differences in different parts.

[0042] Furthermore, the first end of the cooling channel 311 (with Figure 7 For reference, the first end is the lower end) and symmetrically provided with water inlet channels 310 connected to the water collecting block 33, one of the water inlet channels 310 is provided with a limiting plate 317, and the partition plate 3102 located at the first end of the cooling channel 311 is vacant, so that the two water inlets 310 will not collide after entering, and water will enter in one direction, thereby increasing the circulation speed of the liquid.

[0043] As the best embodiment provided by the present invention, a notch is provided on the partition plate 3102 in one of the cooling channels 311 , and a blocking partition plate 314 and a guide plate 315 are symmetrically and alternately arranged on the notch along the central axis of the partition plate 3102 .

[0044] Specifically, the notch is opened at the second end of one of the cooling channels 311 (with Figure 6 For reference, the second end is the upper end), the upper end gap is provided with staggered blocking partitions 314 and guide plates 315, such as Figure 11 As shown, the blocking baffle 314 and the guide plate 315 respectively occupy half the width of the cooling channel 311, and the blocking baffle 314 and the guide plate 315 on the outer channel 312 and the inner channel 313 are staggered, so that the water flows in the outer channel 312 and the inner channel 313 are exchanged when encountering the blocking baffle 314 and the guide plate 315, that is, the water flow in the outer channel 312 enters the inner channel 313, and the water flow in the inner channel 313 enters the outer channel 312 to complete the exchange.

[0045] First, the PE tube 21 extruded by the screw extruder passes through the rotating cover 41. The rotating cover 41 rotates to wind the PSA flame retardant wire 20 around the PE tube 21. Then, the PE tube 21 enters the forming block 31. The forming block 31 moves in a straight line along the waist-circular trajectory and is clamped. At this time, the water pump outlet ejects water to force it to enter the water receiving block 33 along the guide plate 331. The water is transported by the water receiving block 33 into the circulation channel and enters the outer channel 312 and the inner channel 313 respectively. The inner channel 313 is cooled until it reaches the gap. After being guided by the blocking partition 314 and the guide plate 315, the water flow in the outer channel 312 and the inner channel 313 is exchanged to continue cooling the forming block 31. The water in the outer channel 312 pushes the elastic paddle 316 to be discharged, and the water pressure in the circulation channel is maintained. After being cooled and pressed by the forming block 31, the PE tube 21 is discharged and subsequently cut to obtain a finished product.

[0046] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A flame retardant PE communication pipe, characterized in that: The invention comprises a PE tube (21) made of the following raw materials in parts by weight: 55-68 parts of base resin, 22-33 parts of magnesium hydroxide, 3-5 parts of silicone resin, 0.3-0.5 parts of antioxidant, 6-9 parts of expanded graphite, 0.6-0.9 parts of lubricant, and 1-10 parts of masterbatch particles; the outer layer of the PE tube (21) is covered with a wire braided portion (211); the wire braided portion (211) is composed of PSA flame-retardant wire (20).

2. A flame-retardant PE communication pipe preparation system, which is used to prepare the flame-retardant PE communication pipe of claim 1, comprising a screw extruder for melting raw materials and extruding the PE pipe (21), characterized in that: Also included are: A winding assembly (4) comprising a rotating cover (41), wherein a wire reel (43) is provided on the rotating cover (41), and wherein the wire reel (43) rotates to wind the PSA flame-retardant wire (20) toward the PE tube (21); The forming and cooling mechanism (3) comprises two groups of forming blocks (31) that move in a waist-shaped trajectory, wherein cooling channels (311) are provided in the forming blocks (31), and the two cooling channels (311) are connected to each other by the two forming blocks (31) being attached to the PE pipes (21), thereby forming an annular circulation channel.

3. A flame-retardant PE communication pipe preparation system according to claim 2, characterized in that: The molding cooling mechanism (3) further comprises a cold water pool (1); a first end of the molding block (31) is fixedly connected to a water collecting block (33) submerged in the liquid surface; the water collecting block (33) moves with the molding block (31) to supply water to the circulation channel.

4. A flame-retardant PE communication pipe preparation system according to claim 3, characterized in that: The cold water pool (1) is provided with a first water outlet unit (11), and the first water outlet unit (11) discharges water along the central axis of the liquid surface, so that the water flows along two groups of opposite water receiving blocks (33).

5. A flame retardant PE communication pipe preparation system according to claim 2, characterized in that: Conductor rods (411) are arranged in a circumferential array on the rotating cover (41), and fixed sleeves (42) are rotatably connected to the conductor rods (411).

6. A flame-retardant PE communication pipe preparation system according to claim 2, characterized in that: A partition plate (3102) is provided in the cooling channel (311) to separate the circulation channel into an outer channel (312) and an inner channel (313), and liquid flows in the outer channel (312) and the inner channel (313).

7. A flame-retardant PE communication pipe preparation system according to claim 6, characterized in that: A notch is provided on the partition plate (3102) in one of the cooling channels (311), and a blocking partition plate (314) and a guide plate (315) are symmetrically and alternately arranged on the notch along the central axis of the partition plate (3102).

8. The flame-retardant PE communication pipe preparation system according to claim 6, characterized in that: A water outlet (3101) communicating with the outer channel (312) is provided on the second end of the forming block (31), and a unidirectionally movable elastic plate (316) is provided on the water outlet (3101).

9. The flame-retardant PE communication pipe preparation system according to claim 3, characterized in that: A water inlet (310) connected to the water collecting block (33) is symmetrically provided at the first end of the cooling channel (311), wherein a limiting plate (317) is provided on one of the water inlets (310).

10. A flame-retardant PE communication pipe preparation system according to claim 2, characterized in that: The molding cooling mechanism (3) further comprises a driving belt (32) for carrying the molding block (31) and a fixing plate (322) for limiting the molding block (31); a driving disc (321) is coupled to the driving belt (32) for transmission.

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