Electrically conductive upe fluid transfer hose and method of making same

Abstract

This invention discloses a conductive UPE fluid delivery hose. The hose comprises, from the inside out, a UPE inner liner, an inner rubber layer, a first reinforcing layer, a middle rubber layer, a second reinforcing layer, and an outer rubber layer. The UPE inner liner is a UPE tube with conductive spiral patterns. The UPE tube is made of ultra-high molecular weight polyethylene (UHMWPE). The conductive spiral patterns are also made of conductive UHMWPE. The inner rubber layer is composed of EPDM rubber with adhesive properties to the UPE inner liner. The middle rubber layer is composed of EPDM rubber with adhesive properties to the first and second reinforcing layers. The outer rubber layer is composed of flame-retardant EPDM rubber. This invention's conductive UPE fluid delivery hose satisfies antistatic properties while also possessing environmentally friendly manufacturing characteristics, flame retardancy, and excellent fluid flushing performance.

Description

Technical Field

[0001] This invention belongs to the fields of rubber and plastic composite material processing and industrial conveying hoses, and relates to a novel conductive UPE fluid conveying hose and its preparation method. Background Technology

[0002] Currently, the industrial fluid and solid-liquid two-phase transportation fields have imposed increasingly stringent requirements on the safety, cleanliness, durability, and applicability of hoses. In particular, in industries such as food and beverage, pharmaceuticals, fine chemicals, and powder transportation, hoses must simultaneously meet multiple performance requirements, including FDA food contact compliance, wear resistance and anti-clogging, dry and wet compatibility, reel storage, explosion-proof and anti-static properties.

[0003] Ultra-high molecular weight polyethylene (UPE) has become the preferred lining material for high-end conveying hoses due to its extremely low coefficient of friction, excellent wear resistance, chemical corrosion resistance, and food-grade safety. However, UPE is a highly insulating polymer, and during high-speed material flow, friction, and impact, the pipe wall is prone to generating and accumulating a large amount of static electricity. On the one hand, this may form electrostatic sparks, which could cause explosions and fires in flammable and explosive conditions; on the other hand, electrostatic adsorption can cause powder to stick to the wall, scale to form inside the pipe, flow rate reduction, and even affect the purity of the conveyed medium, failing to meet the high cleanliness requirements of food and pharmaceutical industries.

[0004] Some UPE composite hoses are coated with adhesives containing organic solvents during the hose manufacturing process (patent CN110805758A), which is not environmentally friendly or human-friendly. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a novel conductive UPE fluid conveying hose. This hose adopts an integrated design of UPE substrate and conductive spiral pattern, ensuring the characteristics of smooth inner wall, high wear resistance, dual-use (wet and dry) and reel-type application while achieving real-time, continuous, and reliable static electricity discharge. This improves the safety, stability, and cleanliness of the conveying system, filling the market gap for high-end anti-static cleanroom conveying hoses. Furthermore, the manufacturing process of this hose is environmentally friendly, simple, and highly efficient, meeting the upgrading needs of downstream industries.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A novel conductive UPE fluid delivery hose comprises, from the inside out, a UPE inner liner, an inner rubber layer, a first reinforcing layer, a middle rubber layer, a second reinforcing layer, and an outer rubber layer. The UPE inner liner is a UPE tube with conductive spiral patterns. The raw material of the UPE inner liner is ultra-high molecular weight polyethylene (UPE). The raw material of the conductive spiral patterns is conductive ultra-high molecular weight polyethylene (conductive UPE). The rubber compound of the inner rubber layer is an EPDM rubber compound with excellent adhesion to the UPE inner liner. The middle rubber layer is an EPDM rubber compound with adhesive properties to the first and second reinforcing layers. The rubber compound of the outer rubber layer is an environmentally friendly, flame-retardant, and long-life flame-retardant EPDM rubber compound.

[0008] Preferably, the UPE inner liner is a UPE tube with conductive spiral patterns obtained by a composite extrusion process; the conductive UPE spiral patterns are coplanar with the inner wall of the UPE inner liner.

[0009] Specifically, the UPE can be either Celanese GUR X201 or Mitsui Chemicals L3000; the conductive UPE can be Mitsui Chemicals L8000.

[0010] The thickness of the UPE inner lining is 0.25±0.10mm.

[0011] The width of the conductive spiral is 10-50 mm and the thickness is 0.10 ± 0.05 mm.

[0012] The thickness of the inner adhesive layer is 1.50±0.30mm.

[0013] The thickness of the intermediate adhesive layer is 0.80±0.30mm.

[0014] The thickness of the outer adhesive layer is 2.50±0.50mm.

[0015] The inner rubber layer is made of EPDM rubber compound in the following parts by weight: 100 parts EPDM rubber, 45-65 parts N550 carbon black, 40-60 parts kaolin, 5-10 parts silica, 20-30 parts paraffin oil, 2-3.5 parts adhesive resin, 1-3 parts silane coupling agent, 3-5 parts vulcanizing agent DCP, and 1.5-3 parts co-crosslinking agent HVA-2; wherein the Mooney viscosity ML(1+4) 125℃ of the EPDM rubber is 50-70, and the ethylene content is 45-65%; specifically, the EPDM rubber can be EPDM rubber 552.

[0016] The intermediate layer material is a EPDM rubber compound made from the following raw materials in parts by weight: 100 parts EPDM rubber, 60-80 parts N550 carbon black, 25-35 parts talc, 10-20 parts silica, 25-35 parts paraffin oil, 5 parts zinc oxide, 1 part stearic acid, 1-3 parts silane coupling agent, 3-5 parts adhesive resin, 0.3-0.8 parts sulfur, 0.5-1.5 parts accelerator TBzTD, 1-2 parts accelerator BZ, 1-2 parts accelerator CZ, and 1-2 parts accelerator DM; wherein the Mooney viscosity ML(1+4) at 125°C of the EPDM rubber is 50-70, and the ethylene content is 45-65%; specifically, the EPDM rubber can be EPDM rubber 552.

[0017] The outer rubber layer is a flame-retardant EPDM rubber compound made from the following raw materials in parts by weight: 100 parts EPDM rubber, 2-4 parts active zinc oxide, 1-3 parts stearic acid, 40-60 parts N550 carbon black, 40-60 parts calcium silicate, 10-20 parts magnesium hydroxide, 70-90 parts phosphorus-nitrogen compound flame retardant, 2-5 parts silane coupling agent, 1-3 parts antioxidant, 20-30 parts paraffin oil, 1-2 parts sulfur, and 4-6 parts comprehensive accelerator; wherein the Mooney viscosity ML(1+4) 125°C of the EPDM rubber is 60-80, and the ethylene content is 60-70%; specifically, the EPDM rubber can be EPDM rubber 6470C; the nitrogen-phosphorus compound flame retardant is Longsafe nitrogen-phosphorus compound flame retardant. 201, wherein the comprehensive accelerator is comprehensive accelerator DTNF-80, and the antioxidant is a combination of antioxidant RD and antioxidant MB in a weight ratio of 1:1.

[0018] The first reinforcing layer is woven from dipped fibers, and the fibers are one or more of nylon fibers, polyester fibers, vinylon fibers, or aramid fibers; the second reinforcing layer is woven from dipped fibers, and the fibers are one or more of nylon fibers, polyester fibers, vinylon fibers, or aramid fibers.

[0019] Preferably, the first reinforcing layer is made of 1000D to 4000D impregnated polyester yarn, woven using a 36-spindle, 3-strand braiding method.

[0020] More preferably, the first reinforcing layer uses 2000D impregnated polyester yarn.

[0021] Preferably, the second reinforcing layer is made of 1000D to 4000D impregnated polyester yarn, woven using a 36-spindle, 3-strand braiding method.

[0022] More preferably, the second reinforcing layer uses 2000D impregnated polyester yarn.

[0023] The first reinforcing layer has a braided coverage of 70% to 80%; the second reinforcing layer has a winding coverage of 55% to 65%.

[0024] Another object of the present invention is to provide a method for preparing a novel conductive UPE fluid delivery hose, comprising the following steps:

[0025] Step (1): Set the temperatures of each zone of the plastic extruder to 130±5℃, 160±5℃, 185±5℃, 195±5℃, and 185±5℃ respectively. Add the dried UPE tube raw material UPE and the conductive spiral raw material conductive UPE to the single screw extruder. Insert the mandrel into the plastic extruder. The plasticized conductive UPE melt enters the spiral co-extrusion die. The spiral co-extrusion die is coaxially linked with the UPE tube extrusion line. The conductive UPE melt is continuously spirally extruded and tightly adhered to the inner wall of the UPE tube to obtain a tube blank containing a UPE inner liner.

[0026] Step (2): Set the temperatures of each zone of the rubber extruder to 60±5℃, 70±5℃, 75±5℃, and 80±5℃ respectively. Feed the inner rubber layer material into the feed port of the rubber extruder. Insert the tube blank with the mandrel and UPE inner liner into the rubber extruder and extrude the inner rubber layer under vacuum conditions to obtain the tube blank containing the inner rubber layer.

[0027] Step (3): Insert the tube blank containing the inner rubber layer with the mandrel into the braiding machine and braid the fibers to obtain the tube blank containing the first reinforcing layer;

[0028] Step (4): Set the temperatures of each zone of the rubber extruder to 60±5℃, 70±5℃, 75±5℃, and 80±5℃ respectively. Feed the middle layer rubber into the feed port of the rubber extruder. Insert the tube blank with the mandrel and containing the first reinforcing layer into the rubber extruder. Extrude the middle layer rubber under vacuum conditions to obtain the tube blank containing the middle layer.

[0029] Step (5): Insert the tube blank containing the middle rubber layer with the mandrel into the braiding machine and braid the fibers to obtain the tube blank containing the second reinforcing layer;

[0030] Step (6): Set the temperatures of each zone of the rubber extruder to 60±5℃, 65±5℃, 70±5℃, and 75±5℃ respectively. Feed the outer layer rubber material into the feed port of the rubber extruder, insert the tube blank with the mandrel and the second reinforcing layer into the rubber extruder, and extrude the outer layer rubber under vacuum conditions to obtain the final tube blank.

[0031] Step (7): Place the end tube blank with the mandrel on the winding and unwinding machine and wrap the water cloth around the end tube blank;

[0032] Step (8): Vulcanize the final pipe blank wrapped with water cloth; after vulcanization, unwrap the cloth and remove the core to obtain a conductive UPE fluid conveying hose.

[0033] In step (8), the vulcanization is carried out in a vulcanizing tank.

[0034] The vulcanization temperature is 160±2℃, the vulcanization pressure is 0.56±0.05MPa, and the vulcanization time is 60±0.5min.

[0035] The beneficial effects of this invention are:

[0036] The novel conductive UPE fluid delivery hose of this invention not only provides antistatic properties but also exhibits environmental friendliness, flame retardancy, and excellent fluid flushing performance, effectively extending the hose's service life. Specifically:

[0037] The inner liner of the conductive UPE fluid delivery hose of this invention is made of UPE material with conductive spiral patterns, and the inner surface resistivity is less than 10. 6 Below Ω, the problem of static electricity accumulation in UPE is solved. The conductive spiral pattern is a continuous conductive channel. Combined with the overall grounding of the pipe, it can conduct and release static electricity generated on the pipe wall in real time to the ground, eliminating the generation of electrostatic sparks at the source and meeting the strict industrial requirements for explosion-proof safety. At the same time, for viscous fluids, electrostatic adsorption will aggravate the adhesion between the pipe wall and the material, increasing the conveying resistance. After the conductive spiral pattern eliminates static electricity, the material loses the electrostatic adsorption force and can be smoothly conveyed along the smooth inner hole of the UPE, fundamentally avoiding the above problems and maintaining the efficient and stable operation of the conveying system. Compared with point-like or block-like local conductive layers, the continuous spiral conductive pattern can achieve static electricity elimination throughout the pipe, without dead corners or breaks; and the conductive pattern is usually located on the inner wall of the pipe, without damaging the smoothness of the UPE inner hole or affecting its core wear-resistant characteristics, perfectly matching the application requirements of UPE pipes. In addition, UPE has an extremely low coefficient of friction, so the fluid does not stick or adhere to the wall when conveying fluids, and has good flowability. Furthermore, the UPE inner lining meets food and hygiene grade requirements.

[0038] Furthermore, current hoses require an adhesive coating between the inner lining and the inner rubber layer to ensure bonding performance. However, this invention eliminates the need for any adhesive during hose production. Instead, it incorporates an adhesive resin into the inner rubber layer, which reacts chemically with the inner lining during vulcanization, providing sufficient bonding strength. Simultaneously, the design of the middle rubber layer and the second braided layer solves the problem of difficult bonding of the outer flame-retardant rubber layer. The entire production process is environmentally friendly and pollution-free. Because no glue is used, the hose can proceed to the next process immediately after braiding without needing to be stopped, improving production efficiency. The outer rubber layer is a flame-retardant EPDM rubber composition, which incorporates a nitrogen-phosphorus compounded flame retardant and various halogen-free environmentally friendly flame retardants. This causes the rubber to decompose during combustion, generating non-volatile glassy substances and a carbon layer that covers the material surface, forming a dense coating that blocks heat and oxygen penetration, thereby achieving a flame-retardant effect. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of the conductive UPE fluid delivery hose of the present invention.

[0040] Figure 1 In the middle, 1-conductive spiral pattern, 2-UPE inner liner, 3-inner adhesive layer, 4-first reinforcing layer, 5-middle adhesive layer, 6-second reinforcing layer, 7-outer adhesive layer. Detailed Implementation

[0041] The technical solution of the present invention will be further described below through specific embodiments.

[0042] As shown in Table 1, taking a conductive UPE fluid transfer hose with an inner diameter of Φ25mm as an example, the hose structure is as follows: from the inside to the outside.

[0043] Table 1. Hose Structure

[0044]

[0045] Example 1

[0046] A EPDM rubber compound with good adhesion to the UPE inner lining is used to prepare the inner rubber layer of the conductive UPE fluid delivery hose. It is made of the following raw materials in parts by weight: 100 parts EPDM 552, 55 parts N550 carbon black, 50 parts kaolin, 8 parts silica, 25 parts paraffin oil 2280, 3 parts adhesive resin SL-3025C, 2 parts silane coupling agent Si-69, 4 parts vulcanizing agent DCP, and 2.5 parts co-crosslinking agent HVA-2.

[0047] Example 2

[0048] A EPDM rubber compound with good adhesion to the reinforcing layer is used to prepare the middle layer of a conductive UPE fluid delivery hose. It is made from the following raw materials in parts by weight: 100 parts EPDM 552, 70 parts N550 carbon black, 30 parts talc, 15 parts silica, 30 parts paraffin oil 2280, 5 parts zinc oxide, 1 part stearic acid, 2 parts silane coupling agent Si-69, 3 parts adhesive resin SL-3025C, 0.5 parts sulfur, 1 part accelerator TBzTD, 1 part accelerator BZ, 1.5 parts accelerator CZ, and 1 part accelerator DM.

[0049] Example 3

[0050] Flame-retardant EPDM rubber compound used to prepare the outer rubber layer of conductive UPE fluid conveying hoses is made from the following raw materials in parts by weight: 100 parts EPDM 6470C, 3 parts active zinc oxide, 1.5 parts stearic acid, 50 parts N550 carbon black, 50 parts calcium silicate, 15 parts magnesium hydroxide, 80 parts phosphorus-nitrogen compound flame retardant Longsafe 201, 3 parts silane coupling agent Si-69, 1 part antioxidant RD, 1 part antioxidant MB, 25 parts paraffin oil YP5002, 1.5 parts sulfur, and 5 parts comprehensive accelerator DTNF-80.

[0051] Example 4

[0052] like Figure 1 As shown, a novel conductive UPE fluid delivery hose comprises, from the inside out: a UPE inner liner 2, an inner rubber layer 3, a first reinforcing layer 4, a middle rubber layer 5, a second reinforcing layer 6, and an outer rubber layer 7.

[0053] The UPE inner liner 2 is a UPE tube with conductive spiral patterns 1, and the conductive spiral patterns 1 are coplanar with the inner wall of the UPE inner liner 2; the raw material of the UPE tube is Celanese GUR X201; the raw material of the conductive spiral patterns is Mitsui Chemicals L8000.

[0054] The rubber compound of the inner rubber layer 3 is the EPDM rubber compound that has good adhesion to the UPE inner lining layer in Example 1.

[0055] The first reinforcing layer 4 is woven from 2000D impregnated polyester yarn (RFL impregnation system) in a 36-spindle * 3-strand weaving pattern.

[0056] The material of the middle rubber layer 5 is EPDM rubber compound with good adhesion to the reinforcing layer as described in Example 2.

[0057] The second reinforcing layer 6 is woven from 2000D impregnated polyester yarn (RFL impregnation system) in a 36-spindle * 3-strand weaving pattern.

[0058] The outer rubber layer 7 is made of flame-retardant EPDM rubber compound as described in Example 3.

[0059] The preparation method of the novel conductive UPE fluid delivery hose in this embodiment includes the following steps:

[0060] Step (1): Set the temperatures of each zone of the plastic extruder to 130±5℃, 160±5℃, 185±5℃, 195±5℃, and 185±5℃ respectively. Add the dried raw materials of the UPE inner liner (Celanis GUR X201 and Mitsui Chemicals L8000) to the single screw extruder. Insert the mandrel with an outer diameter of Φ25mm into the plastic extruder. The plasticized conductive UPE melt enters the spiral co-extrusion die. The die is coaxially linked with the UPE tube extrusion line. The conductive UPE melt is continuously spirally extruded and tightly adhered to the inner wall of the UPE tube to obtain a tube blank containing the UPE inner liner.

[0061] Step (2): Set the temperatures of each zone of the rubber extruder to 60±5℃, 70±5℃, 75±5℃, and 80±5℃ respectively. Feed the inner rubber layer material into the feed port of the rubber extruder. Insert the tube blank with the mandrel and UPE inner liner into the rubber extruder. Extrude the inner rubber layer under vacuum conditions (vacuum degree ≤40 KPa) to obtain the tube blank containing the inner rubber layer.

[0062] Step (3): Insert the tube blank with the mandrel and inner rubber layer into the braiding machine and braid the fibers according to the braiding method of 36 spindles * 3 strands to obtain the tube blank containing the first reinforcing layer.

[0063] Step (4): Set the temperatures of each zone of the rubber extruder to 60±5℃, 70±5℃, 75±5℃, and 80±5℃ respectively. Feed the intermediate rubber layer into the feed port of the rubber extruder. Insert the tube blank with the mandrel and containing the first reinforcing layer into the rubber extruder. Extrude the intermediate rubber layer under vacuum conditions (vacuum degree ≤40 KPa) to obtain the tube blank containing the intermediate rubber layer.

[0064] Step (5): Insert the tube blank containing the middle rubber layer with the mandrel into the braiding machine and braid the fibers according to the braiding method of 36 spindles * 3 strands to obtain the tube blank containing the second reinforcing layer.

[0065] Step (6): Set the temperatures of each zone of the rubber extruder to 60±5℃, 65±5℃, 70±5℃, and 75±5℃ respectively. Feed the outer rubber layer into the feed port of the rubber extruder. Insert the tube blank with the mandrel and containing the second reinforcing layer into the rubber extruder. Extrude the outer rubber layer under vacuum conditions (vacuum degree ≤40 KPa) to obtain the final tube blank.

[0066] Step (7): Place the end tube blank with the mandrel on the winding and unwinding machine, and wrap the water-coated cloth around the end tube blank;

[0067] Step (8): Transfer the final pipe blank wrapped with water cloth to the vulcanizing cylinder and vulcanize it for 60±0.5 min at a temperature of 160±2℃ and a pressure of 0.56±0.05MPa. After vulcanization, unwrap the cloth and remove the core to obtain a new type of conductive UPE fluid conveying hose.

[0068] Example 5

[0069] Compared to Example 1, the coverage of the second reinforcing layer of the novel conductive UPE fluid delivery hose in this example is 60%, while all other aspects are the same as in Example 1.

[0070] Comparative Example 1

[0071] Compared with Example 1, Comparative Example 1 only replaced the conductive UPE inner liner with a regular UPE inner liner (i.e., the UPE inner liner is a regular UPE tube without conductive spiral patterns), and everything else was the same as Example 1.

[0072] Comparative Example 2

[0073] Compared to Example 1, Comparative Example 2 does not contain a conductive UPE liner, but is otherwise identical to Example 1.

[0074] Table 2. Hose Performance

[0075]

[0076] Note: Inner layer refers to the inner wall of the hose; outer layer refers to the outer wall of the hose.

[0077] The results are shown in Table 2. Compared with the existing ordinary UPE fluid conveying hose (Comparative Example 1), the new conductive UPE fluid conveying hose of the present invention meets the performance requirements such as bursting and hydrostatic pressure. While fully inheriting the advantages of the ordinary UPE fluid conveying hose such as ultra-low friction and food hygiene grade, the conductive UPE fluid conveying hose adds key functions such as antistatic, explosion-proof and non-adsorption of powder, making it safer.

[0078] Compared to Example 1, the hose in Comparative Example 2, due to the removal of the UPE inner liner, exhibits a significant increase in the surface resistance and dynamic friction coefficient of its inner layer, making the inner surface of the hose prone to adhesion, scaling, and difficult cleaning. Furthermore, the lack of a UPE inner liner in Comparative Example 2 narrows the range of chemicals that can be transported. In summary, the novel conductive UPE fluid transport hose of this invention possesses the characteristics of explosion-proof safety, high transport efficiency, and hygienic safety.

Claims

1. A conductive UPE fluid delivery hose, characterized in that: The hose comprises, from the inside out, a UPE inner liner, an inner rubber layer, a first reinforcing layer, a middle rubber layer, a second reinforcing layer, and an outer rubber layer. The UPE inner liner is a UPE tube with conductive spiral patterns. The UPE tube is made of ultra-high molecular weight polyethylene. The conductive spiral patterns are made of conductive ultra-high molecular weight polyethylene. The inner rubber layer is made of EPDM rubber, which has adhesive properties with the UPE inner liner. The middle rubber layer is made of EPDM rubber, which has adhesive properties with the first and second reinforcing layers. The outer rubber layer is made of flame-retardant EPDM rubber.

2. The conductive UPE fluid delivery hose according to claim 1, characterized in that: The thickness of the UPE inner liner is 0.25±0.10mm; the width of the conductive spiral pattern is 10-50mm and the thickness is 0.10±0.05mm, and the conductive spiral pattern is coplanar with the inner wall of the UPE inner liner; the thickness of the inner adhesive layer is 1.50±0.30mm; the thickness of the middle adhesive layer is 0.80±0.30mm; and the thickness of the outer adhesive layer is 2.50±0.50mm.

3. The conductive UPE fluid delivery hose according to claim 1, characterized in that: The inner rubber layer is made of EPDM rubber compound in the following parts by weight: 100 parts EPDM rubber, 45-65 parts N550 carbon black, 40-60 parts kaolin, 5-10 parts silica, 20-30 parts paraffin oil, 2-3.5 parts adhesive resin, 1-3 parts silane coupling agent, 3-5 parts vulcanizing agent DCP, and 1.5-3 parts co-crosslinking agent HVA-2; wherein the Mooney viscosity ML(1+4) at 125°C of the EPDM rubber is 50-70, and the ethylene content is 45-65%.

4. The conductive UPE fluid delivery hose according to claim 1, characterized in that: The intermediate layer material is a EPDM rubber compound made from the following raw materials in parts by weight: 100 parts EPDM rubber, 60-80 parts N550 carbon black, 25-35 parts talc, 10-20 parts silica, 25-35 parts paraffin oil, 5 parts zinc oxide, 1 part stearic acid, 1-3 parts silane coupling agent, 3-5 parts adhesive resin, 0.3-0.8 parts sulfur, 0.5-1.5 parts accelerator TBzTD, 1-2 parts accelerator BZ, 1-2 parts accelerator CZ, and 1-2 parts accelerator DM; wherein the Mooney viscosity ML(1+4) at 125°C of the EPDM rubber is 50-70, and the ethylene content is 45-65%.

5. The conductive UPE fluid delivery hose according to claim 1, characterized in that: The outer rubber layer is a flame-retardant EPDM rubber compound made from the following raw materials in parts by weight: 100 parts EPDM rubber, 2-4 parts active zinc oxide, 1-3 parts stearic acid, 40-60 parts N550 carbon black, 40-60 parts calcium silicate, 10-20 parts magnesium hydroxide, 70-90 parts phosphorus-nitrogen compound flame retardant, 2-5 parts silane coupling agent, 1-3 parts antioxidant, 20-30 parts paraffin oil, 1-2 parts sulfur, and 4-6 parts comprehensive accelerator; wherein the Mooney viscosity ML(1+4) 125℃ of the EPDM rubber is 60-80, and the ethylene content is 60-70%; the nitrogen-phosphorus compound flame retardant is Longsafe 201, the comprehensive accelerator is DTNF-80, and the antioxidant is a combination of antioxidant RD and antioxidant MB in a 1:1 weight ratio.

6. The conductive UPE fluid delivery hose according to claim 1, characterized in that: The first reinforcing layer is woven from dipped fibers, and the fibers are one or more of nylon fibers, polyester fibers, vinylon fibers, or aramid fibers; the weaving coverage of the first reinforcing layer is 70% to 80%; the second reinforcing layer is woven from dipped fibers, and the fibers are one or more of nylon fibers, polyester fibers, vinylon fibers, or aramid fibers; the winding coverage of the second reinforcing layer is 55% to 65%.

7. The conductive UPE fluid delivery hose according to claim 1 or 6, characterized in that: The first reinforcing layer is made of 1000D to 4000D impregnated polyester yarn, woven in a 36-spindle, 3-strand braiding method; the second reinforcing layer is made of 1000D to 4000D impregnated polyester yarn, woven in a 36-spindle, 3-strand braiding method.

8. The conductive UPE fluid delivery hose according to claim 7, characterized in that: The first reinforcing layer uses 2000D impregnated polyester yarn; the second reinforcing layer uses 2000D impregnated polyester yarn.

9. A method for preparing the conductive UPE fluid delivery hose according to claim 1, characterized in that: Includes the following steps: Step (1): Set the temperatures of each zone of the plastic extruder to 130±5℃, 160±5℃, 185±5℃, 195±5℃, and 185±5℃ respectively. Add the dried UPE tube raw material and the conductive spiral material to the single screw extruder. Insert the mandrel into the plastic extruder. The plasticized conductive UPE melt enters the spiral co-extrusion die. The spiral co-extrusion die is coaxially linked with the UPE tube extrusion line. The conductive UPE melt is continuously spirally extruded and tightly adhered to the inner wall of the UPE tube to obtain a tube blank containing a UPE inner lining layer. Step (2): Set the temperatures of each zone of the rubber extruder to 60±5℃, 70±5℃, 75±5℃, and 80±5℃ respectively. Feed the inner rubber layer material into the feed port of the rubber extruder. Insert the tube blank with the mandrel and UPE inner liner into the rubber extruder and extrude the inner rubber layer under vacuum conditions to obtain the tube blank containing the inner rubber layer. Step (3): Insert the tube blank containing the inner rubber layer with the mandrel into the braiding machine and braid the fibers to obtain the tube blank containing the first reinforcing layer; Step (4): Set the temperatures of each zone of the rubber extruder to 60±5℃, 70±5℃, 75±5℃, and 80±5℃ respectively. Feed the middle layer rubber into the feed port of the rubber extruder. Insert the tube blank with the mandrel and containing the first reinforcing layer into the rubber extruder. Extrude the middle layer rubber under vacuum conditions to obtain the tube blank containing the middle layer. Step (5): Insert the tube blank containing the middle rubber layer with the mandrel into the braiding machine and braid the fibers to obtain the tube blank containing the second reinforcing layer; Step (6): Set the temperatures of each zone of the rubber extruder to 60±5℃, 65±5℃, 70±5℃, and 75±5℃ respectively. Feed the outer layer rubber material into the feed port of the rubber extruder, insert the tube blank with the mandrel and the second reinforcing layer into the rubber extruder, and extrude the outer layer rubber under vacuum conditions to obtain the final tube blank. Step (7): Place the end tube blank with the mandrel on the winding and unwinding machine and wrap the water cloth around the end tube blank; Step (8): Vulcanize the final pipe blank wrapped with water cloth; after vulcanization, unwrap the cloth and remove the core to obtain a conductive UPE fluid conveying hose.

10. The method for preparing the conductive UPE fluid delivery hose according to claim 9, characterized in that: In step (8), the vulcanization temperature is 160±2℃, the vulcanization pressure is 0.56±0.05MPa, and the vulcanization time is 60±0.5min.

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