Rubber hose for liquid cooling system and manufacturing method thereof

Abstract

The invention discloses a rubber material for preparing a rubber hose for a liquid cooling system. The rubber material is prepared from the following raw materials in parts by weight: 55-80 parts of high Mooney ethylene propylene diene monomer, 20-45 parts of low Mooney ethylene propylene diene monomer, 100-150 parts of fast extruding furnace black, 30-65 parts of paraffin oil, 3-8 parts of petroleum resin, 1-5 parts of an anti-aging agent, 2-7 parts of an adhesive, 3-8 parts of zinc oxide, 1-3 parts of stearic acid, 0.3-1.5 parts of sulfur and 3-8 parts of an accelerant. The invention further discloses a rubber hose for the liquid cooling system. The rubber hose sequentially comprises an inner rubber layer, a first reinforcing layer, a first middle rubber layer, a second reinforcing layer, a second middle rubber layer, a third reinforcing layer and an outer rubber layer from inside to outside. The flexible pipe has the advantages of excellent flexibility, small bending radius, improvement of the flexibility and efficiency of the spatial layout of the liquid cooling system, good compatibility with the electronic fluorinated liquid, excellent high and low temperature resistance, excellent ozone resistance and the like, and excellent durability.

Description

Technical Field

[0001] The invention belongs to the field of rubber composite material processing, and relates to a rubber material for a rubber hose for a liquid cooling system, in particular to an inner layer, a middle layer and an outer layer rubber material for the rubber hose for a liquid cooling system, and a rubber hose for a liquid cooling system made of the rubber material. Background Art

[0002] With the development of technologies such as artificial intelligence, cloud computing, big data, and blockchain, the 5G communication era, which is characterized by high speed, low latency, and large connections, has arrived. The requirements for heat dissipation in fields such as AI computing power, data centers, and semiconductors are getting higher and higher. Traditional air cooling and water cooling methods can no longer meet the needs. In this context, liquid cooling technology, with its ultra-high energy efficiency and ultra-high thermal density, is gradually becoming the focus of industry attention and a key path to solving heat dissipation bottlenecks and energy-saving challenges.

[0003] There are many types of media commonly used in liquid cooling systems, including deionized water, alcohol-based solutions, fluorocarbon-based working fluids, mineral oil or silicone oil. Among them, electronic fluorinated liquid, as an emerging cooling medium, is colorless, odorless, non-oil-based and non-corrosive, with a wide operating temperature range, low toxicity, excellent chemical stability and excellent dielectric properties. Due to its unique performance advantages, electronic fluorinated liquid occupies an important position in the pursuit of efficient, safe and environmentally friendly liquid cooling systems, and has become the preferred medium for high-end liquid cooling and special applications.

[0004] In the prior art, metal cooling tubes such as copper and aluminum have excellent thermal conductivity, but their inherent defects such as poor toughness and large bending radius not only limit the flexibility of the cooling tube in spatial layout, but also easily lead to stress concentration, deformation and even leakage due to the significant thermal expansion and contraction effect, thus shortening the service life of the cooling tube and affecting the overall performance of the system. Therefore, the development of a new cooling tube for liquid cooling system has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The purpose of the present invention is to address the shortcomings of existing cooling pipes in liquid cooling systems, comprehensively consider the performance of flexibility, bending performance, high and low temperature resistance, innovate the hose formula and structure, and provide a rubber compound for preparing cooling pipes and a rubber hose for liquid cooling systems made of the rubber compound. The hose not only has excellent flexibility, a small bending radius, and good compatibility with electronic fluorinated liquid, but also is resistant to high and low temperatures, can effectively resist the stress caused by temperature changes, has a long service life, and can ensure the long-term, safe and reliable operation of the liquid cooling system.

[0006] The objective of the present invention is achieved through the following technical solutions: A rubber compound for preparing a rubber hose for a liquid cooling system is prepared from the following raw materials in parts by weight: 55-80 parts of high-Mooney EPDM rubber, 20-45 parts of low-Mooney EPDM rubber, 100-150 parts of quick-extrusion carbon black, 30-65 parts of paraffin oil, 3-8 parts of petroleum resin, 1-5 parts of antioxidant, 2-7 parts of adhesive, 3-8 parts of zinc oxide, 1-3 parts of stearic acid, 0.3-1.5 parts of sulfur, and 3-8 parts of accelerator; wherein the total weight of the high-Mooney EPDM rubber and the low-Mooney EPDM rubber is 100 parts.

[0007] Preferably, the rubber material used to prepare the rubber hose for the liquid cooling system is made of the following raw materials in parts by weight: 60 to 75 parts of high Mooney EPDM rubber, 25 to 40 parts of low Mooney EPDM rubber, 120 to 140 parts of quick-extrusion carbon black, 40 to 60 parts of paraffin oil, 4 to 6 parts of petroleum resin, 2 to 4 parts of antioxidant, 3 to 5 parts of adhesive, 3 to 8 parts of zinc oxide, 1 to 3 parts of stearic acid, 0.3 to 1 part of sulfur, and 4 to 6 parts of accelerator.

[0008] The Mooney viscosity ML (1+4) of the high Mooney EPDM rubber at 125°C is 70-90, the ethylene content is 45%-55%, and the content of the third monomer ethylidene norbornene is 5.0%-6.0%; the Mooney viscosity ML (1+4) of the low Mooney EPDM rubber at 125°C is 30-45, the ethylene content is 45%-55%, and the content of the third monomer ethylidene norbornene is 4.0%-5.0%.

[0009] The paraffin oil is paraffin oil SUNPAR 2280; the petroleum resin is petroleum resin HC52110; and the adhesive is adhesive RC.

[0010] The antioxidant is at least one of antioxidant MB and antioxidant RD, preferably a combination of antioxidant MB and antioxidant RD in a mass ratio of 1:1.

[0011] The accelerator is at least one of accelerator TMTD, accelerator DPTT, accelerator BZ and accelerator DTDM, preferably a combination of accelerator DTDM, accelerator TMTD, accelerator DPTT and accelerator BZ in a mass ratio of 1:(1-2):(2-3):(2-3).

[0012] Another object of the present invention is to provide a method for preparing the rubber compound for preparing a rubber hose for a liquid cooling system, comprising the following steps: Step (1), cooling the internal mixer with water, controlling the temperature of the internal mixer working room to not exceed 50° C., adding high Mooney EPDM rubber, low Mooney EPDM rubber, zinc oxide, stearic acid and antioxidant, and mixing for 1 to 2 minutes; Step (2), adding quick-pressed carbon black, paraffin oil, petroleum resin and adhesive, and mixing for 2 to 4 minutes; Step (3), adding sulfur and accelerator, mixing for 0.5 to 2 minutes, and then draining after the temperature of the internal mixer rises to 110°C; Step (4), moving the rubber material to an open mixing mill for thinning, and leaving it to stand for 8 hours to obtain a rubber material for preparing a rubber hose for a liquid cooling system.

[0013] Another object of the present invention is to provide a rubber hose for a liquid cooling system, which comprises, from the inside to the outside, an inner rubber layer, a first reinforcement layer, a first middle rubber layer, a second reinforcement layer, a second middle rubber layer, a third reinforcement layer, and an outer rubber layer; the inner rubber layer, the first middle rubber layer, the second middle rubber layer, and the outer rubber layer are all made by extruding the rubber material described in claim 1; the first reinforcement layer and the third reinforcement layer are woven by polyester wire; and the second reinforcement layer is wound by copper-plated steel wire.

[0014] The thickness of the inner rubber layer is 2.0-2.4 mm; the thickness of the first middle rubber layer is 0.3-0.5 mm; the thickness of the second middle rubber layer is 0.4-0.6 mm; the thickness of the outer rubber layer is 2.0-2.4 mm; the first reinforcement layer and the third reinforcement layer are both woven from polyester wire using a 36-spindle 2-strand weaving method, with a coverage rate of 80-90%; the second reinforcement layer is wound with copper-plated steel wire, with a pitch of 6-8 mm.

[0015] Another object of the present invention is to provide a method for preparing a rubber hose for a liquid cooling system, comprising: inner layer rubber extrusion, polyester wire braiding, first middle layer rubber extrusion, copper-plated steel wire winding, second middle layer rubber extrusion, polyester wire braiding, outer layer rubber extrusion, cloth winding, vulcanization, cloth unwinding, core removal, and inspection steps; wherein the vulcanization pressure is 0.4-0.6MPa, the vulcanization temperature is 150±5°C, and the vulcanization time is 60±2min.

[0016] The present invention selects and uses a high Mooney EPDM rubber with a Mooney viscosity ML (1+4) of 70 to 90 at 125°C, an ethylene content of 45% to 55%, and a third monomer ethylidene norbornene content of 5.0% to 6.0% and a low Mooney EPDM rubber with a Mooney viscosity ML (1+4) of 30 to 45 at 125°C, an ethylene content of 45% to 55%, and a third monomer ethylidene norbornene content of 4.0% to 5.0%. The two rubbers not only have good processing performance, but also can make the rubber material have higher filling capacity, better strength and molding stiffness, and have good compatibility with electronic fluorinated liquid.

[0017] The present invention selects environmentally friendly paraffin oil SUNPAR 2280 as a plasticizer, which has high saturated hydrocarbon content, stable molecular weight, high flash point, good compatibility with EPDM rubber, small odor, and can improve the processing performance and high temperature resistance of the rubber.

[0018] Petroleum resin HC52110 belongs to C5 / C9 copolymerized petroleum resin, has low odor and good thermal stability. Adhesive RC is a complex compound based on melamine, belongs to the m-methyl-white bonding system, and has the dual functions of methylene donor and methylene acceptor. The present invention selects petroleum resin HC52110 and adhesive RC to use together, which can make the rubber have good adhesion and improve the bonding strength between the rubber and the fiber reinforcement layer and the copper-plated steel wire.

[0019] The antioxidant MB and the antioxidant RD of the present invention are used together, which has a good "synergistic effect" and can make the rubber material have excellent properties such as heat aging resistance and ozone resistance.

[0020] The present invention selects carbon black N550 as a reinforcing filler. Carbon black N550 has a medium particle size, a high structure, low heat generation and good thermal conductivity, and can give the rubber compound good processing performance and physical and mechanical properties.

[0021] The vulcanization system of the present invention uses sulfur and accelerators TMTD, accelerator DPTT, accelerator BZ and accelerator DTDM in combination, which can significantly improve the crosslinking degree of the rubber material, so that the rubber material has excellent physical and mechanical properties, high and low temperature resistance and other properties.

[0022] Beneficial effects of the present invention: The invention uses high-Mooney and low-Mooney EPDM rubbers, antioxidants MB and RD, paraffin oil SUNPAR 2280, and adds petroleum resin HC52110 and adhesive RC, so that the rubber material not only has good physical and mechanical properties, high and low temperature resistance, and ozone resistance, but also has good compatibility with electronic fluorinated liquid.

[0023] The rubber hose for liquid cooling system made of the rubber compound of the present invention has excellent flexibility, small bending radius, good adhesion between layers of the hose, excellent high and low temperature resistance, ozone resistance and other properties, excellent durability, and a service life of up to 15 years. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the rubber hose for the liquid cooling system of the present invention.

[0025] Figure 1 In the figure, 1-inner rubber layer; 2-first reinforcement layer; 3-first middle rubber layer; 4-second reinforcement layer; 5-second middle rubber layer; 6-third reinforcement layer; 7-outer rubber layer. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described below through specific implementation methods.

[0027] Table 1. Compound formula Example 1 The raw materials and amounts of the rubber compound of this embodiment are shown in Table 1, and are prepared in the following manner: Step (1), cooling the internal mixer with water, controlling the working temperature of the internal mixer to not exceed 50° C., adding high Mooney EPDM rubber, low Mooney EPDM rubber, zinc oxide, stearic acid and antioxidant, and mixing for 1.5 min; Step (2), adding quick-pressed carbon black, paraffin oil, petroleum resin and adhesive, and mixing for 3 minutes; Step (3), adding sulfur and accelerator, mixing for 1 minute, and then draining the rubber after the temperature of the internal mixer rises to 110°C; Step (4), moving the rubber material to an open mixing mill for thinning, and leaving it to stand for 8 hours to obtain a rubber material for preparing a rubber hose for a liquid cooling system.

[0028] Example 2 The raw materials and amounts of the rubber material in this example are shown in Table 1, and the preparation method is the same as that in Example 1.

[0029] Example 3 The raw materials and amounts of the rubber material in this example are shown in Table 1, and the preparation method is the same as that in Example 1.

[0030] Comparative Example 1 The raw materials and amounts of the rubber compound of this comparative example are shown in Table 1. Compared with Example 2, the comparative example 1 does not use EPDM Keltan 4450S (low Mooney EPDM rubber), but because the Mooney viscosity of the rubber compound is too high, it cannot be mixed normally according to the preparation method of Example 1.

[0031] Comparative Example 2 The raw materials and amounts of the rubber compound of this comparative example are shown in Table 1. Compared with Example 2, the comparative example 2 does not use EPDM Keltan 8550C (high Mooney EPDM rubber), and the preparation method is the same as that of Example 1.

[0032] Comparative Example 3 The raw materials and dosage of the rubber compound of this comparative example are shown in Table 1. Compared with Example 2, the petroleum resin HC52110 is not used in Comparative Example 3, and the preparation method is the same as that of Example 1.

[0033] Comparative Example 4 The raw materials and dosage of the rubber material in this comparative example are shown in Table 1. Compared with Example 2, the comparative example 4 does not use the adhesive RC, and the preparation method is the same as that of Example 1.

[0034] The properties of the rubber materials obtained in Example 1 to Example 3 and Comparative Example 2 to Comparative Example 4 were investigated, and experiments were conducted in accordance with the standards "GB / T531.1-2008", "GB / T 528-2009" and "GB / T 1690-2010". The results are shown in Table 2.

[0035] Table 2. Rubber performance parameters Example 4 like Figure 1 As shown, a rubber hose for a liquid cooling system is prepared according to Table 3, which includes, from inside to outside, an inner rubber layer 1, a first reinforcement layer 2, a first middle rubber layer 3, a second reinforcement layer 4, a second middle rubber layer 5, a third reinforcement layer 6, and an outer rubber layer 7. The preparation method of the rubber hose for a liquid cooling system is as follows, comprising the following steps: Step (1), feeding the rubber material from a cold feeder, and extruding it with a φ25.0 mm mandrel to obtain an inner rubber layer with a thickness of 2.6 mm; weaving 36 spindles and 2 strands to obtain a first reinforcement layer with a coverage of 85%; Step (2), the rubber material is extruded and coated on the outside of the first reinforcement layer to obtain a first middle rubber layer with a thickness of 0.4 mm; and the second reinforcement layer is obtained by winding with copper-plated steel wire; Step (3), the rubber material is extruded and coated on the outer side of the second reinforcement layer to obtain a second middle rubber layer with a thickness of 0.5 mm; and a third reinforcement layer with a coverage rate of 80% is obtained by weaving 36 spindles and 2 strands; Step (4), the rubber material is extruded and coated on the outside of the third reinforcement layer to obtain an outer rubber layer with a thickness of 1.8 mm; and the tube blank is formed after being wrapped with cloth; Step (5), the tube blank is vulcanized at a temperature of 150° C. and a pressure of 0.5 MPa for 60 minutes; and the rubber hose for the liquid cooling system is obtained by unwinding, removing the core, and inspecting.

[0036] Table 4. Hose structure The hose performance is as follows: Table 4. Hose performance It can be seen from Comparative Examples 3 and 4 that when petroleum resin HC52110 and adhesive RC are not used simultaneously in the formula, although the physical and mechanical properties of the rubber and the compatibility with electronic fluorinated liquid do not change much, the bonding strength between the layers of the hose made from the corresponding rubber is significantly reduced. It can be seen that petroleum resin HC52110 and adhesive RC need to be compounded to make the hose have excellent bonding properties. Good bonding between the layers of the hose can ensure the integrity and long life of the hose. The rubber of Comparative Example 2 uses a single low Mooney EPDM rubber. The physical and mechanical properties of the rubber and the compatibility with electronic fluorinated liquid are poor. The stiffness of the hose made from the rubber is poor, and the bending performance cannot meet the requirements. When the copper-plated steel wire winding layer is missing in the hose structure or the pitch is not within the required range, the bending performance is poor. In addition, the hose of the present invention is first bent around a core shaft with a diameter twice the outer diameter, and then subjected to tests such as bending performance, temperature cycle, and ozone resistance, and the test results are good. As is known to all, the minimum bending radius of a general rubber hose is 5 to 8 times of the nominal outer diameter, while the minimum bending radius of the rubber hose for the liquid cooling system of the present invention is smaller, even less than twice of the outer diameter of the hose.

[0037] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A rubber compound for preparing a rubber hose for a liquid cooling system, characterized in that: The invention is made of the following raw materials in parts by weight: 55-80 parts of high Mooney EPDM rubber, 20-45 parts of low Mooney EPDM rubber, 100-150 parts of quick-extrusion carbon black, 30-65 parts of paraffin oil, 3-8 parts of petroleum resin, 1-5 parts of antioxidant, 2-7 parts of adhesive, 3-8 parts of zinc oxide, 1-3 parts of stearic acid, 0.3-1.5 parts of sulfur and 3-8 parts of accelerator; wherein the total parts by weight of the high Mooney EPDM rubber and the low Mooney EPDM rubber is 100 parts.

2. The rubber material for preparing a rubber hose for a liquid cooling system according to claim 1, characterized in that: The rubber material used for preparing the rubber hose for the liquid cooling system is made of the following raw materials in parts by weight: 60 to 75 parts of high Mooney EPDM rubber, 25 to 40 parts of low Mooney EPDM rubber, 120 to 140 parts of quick-extrusion carbon black, 40 to 60 parts of paraffin oil, 4 to 6 parts of petroleum resin, 2 to 4 parts of antioxidant, 3 to 5 parts of adhesive, 3 to 8 parts of zinc oxide, 1 to 3 parts of stearic acid, 0.3 to 1 part of sulfur, and 4 to 6 parts of accelerator.

3. The rubber material for preparing a rubber hose for a liquid cooling system according to claim 1 or 2, characterized in that: The Mooney viscosity ML (1+4) of the high Mooney EPDM rubber at 125°C is 70-90, the ethylene content is 45%-55%, and the content of the third monomer ethylidene norbornene is 5.0%-6.0%; the Mooney viscosity ML (1+4) of the low Mooney EPDM rubber at 125°C is 30-45, the ethylene content is 45%-55%, and the content of the third monomer ethylidene norbornene is 4.0%-5.0%.

4. The rubber material for preparing a rubber hose for a liquid cooling system according to claim 1 or 2, characterized in that: The paraffin oil is paraffin oil SUNPAR 2280; the petroleum resin is petroleum resin HC52110; and the adhesive is adhesive RC.

5. The rubber compound for preparing a rubber hose for a liquid cooling system according to claim 1 or 2, characterized in that: The antioxidant is at least one of antioxidant MB and antioxidant RD; the accelerator is at least one of accelerator TMTD, accelerator DPTT, accelerator BZ and accelerator DTDM.

6. The rubber material for preparing a rubber hose for a liquid cooling system according to claim 1 or 2, characterized in that: The antioxidant is a combination of antioxidant MB and antioxidant RD in a mass ratio of 1:1; the accelerator is a combination of accelerator DTDM, accelerator TMTD, accelerator DPTT and accelerator BZ in a mass ratio of 1:(1-2):(2-3):(2-3).

7. A method for preparing a rubber compound for preparing a rubber hose for a liquid cooling system according to claim 1 or 2, characterized in that: The following steps are involved: Step (1), cooling the internal mixer with water, controlling the temperature of the internal mixer working room to not exceed 50° C., adding high Mooney EPDM rubber, low Mooney EPDM rubber, zinc oxide, stearic acid and antioxidant, and mixing for 1 to 2 minutes; Step (2), adding quick-pressed carbon black, paraffin oil, petroleum resin and adhesive, and mixing for 2 to 4 minutes; Step (3), adding sulfur and accelerator, mixing for 0.5 to 2 minutes, and then draining after the temperature of the internal mixer rises to 110°C; Step (4), moving the rubber material to an open mixing mill for thinning, and leaving it to stand for 8 hours to obtain a rubber material for preparing a rubber hose for a liquid cooling system.

8. A rubber hose for a liquid cooling system, characterized in that: From the inside to the outside, it includes an inner rubber layer, a first reinforcement layer, a first middle rubber layer, a second reinforcement layer, a second middle rubber layer, a third reinforcement layer, and an outer rubber layer; the inner rubber layer, the first middle rubber layer, the second middle rubber layer, and the outer rubber layer are all made by extruding the rubber material described in claim 1; the first reinforcement layer and the third reinforcement layer are woven by polyester wire; the second reinforcement layer is wound by copper-plated steel wire.

9. The rubber hose for liquid cooling system according to claim 8, characterized in that: The thickness of the inner rubber layer is 2.0-3.0 mm; the thickness of the first middle rubber layer is 0.3-0.5 mm; the thickness of the second middle rubber layer is 0.4-0.6 mm; the thickness of the outer rubber layer is 1.5-2.5 mm; the first reinforcement layer and the third reinforcement layer are both woven from polyester wire using a 36-spindle 2-strand weaving method, with a coverage rate of 80-90%; the second reinforcement layer is wound with copper-plated steel wire, with a pitch of 6-8 mm.

10. A method for preparing the rubber hose for a liquid cooling system according to claim 8, characterized in that: include: The process includes inner layer rubber extrusion, polyester wire braiding, first middle layer rubber extrusion, copper-plated steel wire winding, second middle layer rubber extrusion, polyester wire braiding, outer layer rubber extrusion, cloth winding, vulcanization, cloth unwinding, core removal and inspection. The vulcanization pressure is 0.4-0.6MPa, the vulcanization temperature is 150±5℃ and the vulcanization time is 60±2min.

Images