Rubber hose for immersed liquid cooling system and preparation method thereof

Abstract

The invention discloses a rubber hose for an immersed liquid cooling system. The rubber hose sequentially comprises an inner rubber layer, a first reinforcing layer, a middle rubber layer, a second reinforcing layer and an outer rubber layer from inside to outside, the inner rubber layer, the middle rubber layer and the outer rubber layer are all prepared by extruding the rubber material; the first reinforcing layer and the second reinforcing layer are both formed by winding polyester threads. The rubber hose disclosed by the invention has the advantages of medium extraction resistance, flexibility, easiness in bending, long service life and the like, is suitable for an immersed liquid cooling system of a data center, and can ensure long-term, safe and reliable operation of the liquid cooling system.

Description

Technical Field

[0001] The invention belongs to the field of rubber composite material processing, and relates to a rubber material for preparing a rubber hose for an immersion liquid cooling system, and in particular to a rubber hose for an immersion liquid cooling system and a preparation method thereof. Background Art

[0002] With the explosive growth of data volume, a large amount of computing power requires a large number of servers to support it. However, due to the limitations of data center construction area and environmental regulations, increasing the power density of a single cabinet has become a key solution to reconcile the growing demand for computing power and the limited carrying capacity of data centers. The large amount of data throughput and calculations have made data centers, which serve as the "brain" of emerging technologies such as artificial intelligence and big data, face unprecedented energy consumption and heat dissipation challenges. In this context, liquid-cooled data centers that use liquid cooling technology and liquid-cooled servers and other equipment have emerged, providing a new solution for data center cooling.

[0003] Liquid cooling systems commonly use a variety of media, including deionized water, alcohol-based solutions, fluorocarbon fluids, mineral oil, or silicone oil. Synthetic hydrocarbons, as a new cooling medium, offer advantages such as low density, rapid thermal conductivity, no signal interference, good compatibility, high surface tension, high boiling point, easy degradation, and low cost. Leveraging their combined advantages of thermal stability, insulation, safety, and environmental friendliness, they are becoming a mainstream choice for high-power density liquid cooling systems. Their core competitiveness lies in balancing the high performance of fluorinated fluids with the low cost of water-based / mineral oils, making them particularly irreplaceable in immersion cooling scenarios.

[0004] Existing metal cooling pipes, 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 pipe in spatial layout, but also easily lead to stress concentration, deformation and even leakage due to the significant thermal expansion and contraction effect, thereby shortening the service life of the cooling pipe and affecting the overall performance of the system. Although PTFE (polytetrafluoroethylene) pipes have the advantages of high temperature resistance, corrosion resistance, and good insulation, they also have some obvious disadvantages. For example, under continuous load or high temperature, PTFE will slowly deform (creep), which may cause pipeline loosening, seal failure, and even coolant leakage. At the same time, it has strong rigidity and a large bending radius, making it difficult to adapt to complex pipeline layouts. Therefore, the development of a new cooling pipe for immersion cooling systems with excellent flexibility, small bending radius, good compatibility with synthetic hydrocarbons, good extraction resistance, and long service life 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 immersion cooling systems. Taking into account flexibility, bending performance, extraction resistance, etc., the rubber material and structure of the hose are innovated. A rubber compound for preparing a rubber hose for an immersion liquid cooling system and a rubber hose for an immersion cooling system made of the rubber compound are provided. The hose not only has excellent flexibility, a small bending radius, and good compatibility with synthetic hydrocarbons, but also has good extraction resistance and a long service life, which can ensure the long-term, safe and reliable operation of the liquid cooling system.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A rubber compound for preparing a rubber hose for an immersion liquid cooling system is prepared from the following raw materials in parts by weight: 100 parts of NBR / PVC rubber, 10-15 parts of N550 carbon black, 15-25 parts of white carbon black, 25-35 parts of silicon micropowder, 10-20 parts of plasticizer, 5 parts of zinc oxide, 1 part of stearic acid, 2-4 parts of antioxidant, 0.3-0.8 part of sulfur, and 3-5 parts of accelerator.

[0008] Preferably, the rubber compound for preparing the rubber hose for the immersion liquid cooling system is made of the following raw materials in parts by weight: 100 parts of NBR / PVC rubber, 10 parts of N550 carbon black, 15 parts of white carbon black, 25 parts of silicon micropowder, 15 parts of plasticizer, 5 parts of zinc oxide, 1 part of stearic acid, 3 parts of antioxidant, 0.5 parts of sulfur, and 4.5 parts of accelerator.

[0009] The Mooney viscosity ML (1+4) of the NBR / PVC rubber at 100 DEG C is 65-80, the content of acrylonitrile is 30-40%, and the weight ratio of NBR to PVC is 70:30.

[0010] The plasticizer is one or a combination of RS107, TP95 or DOS.

[0011] The antioxidant is one or a combination of ECOSCINOX 1010, ECOSCINOX 168 or ECOSCINOX 1076, preferably a combination of ECOSCINOX 1010 and ECOSCINOX 1076 in a weight ratio of 1:1.

[0012] The accelerator is one or more of accelerator TBzTD, accelerator DM, accelerator CZ, and accelerator TET, preferably a combination of accelerator TBzTD, accelerator DM, and accelerator CZ in a weight ratio of 1:1:1.

[0013] Another object of the present invention is to provide a method for preparing the rubber compound for preparing the rubber hose for the immersion liquid cooling system, comprising the following steps:

[0014] Step (1), cooling the internal mixer with water, controlling the temperature of the internal mixer working room to not exceed 60° C., adding NBR / PVC rubber, zinc oxide, stearic acid, antioxidant and silica powder, and mixing for 90±5 seconds;

[0015] Step (2), adding plasticizer, N550 carbon black and white carbon black, and mixing for 5±0.5 minutes;

[0016] Step (3), adding sulfur and accelerator, mixing, and discharging the rubber material after the temperature reaches 110°C;

[0017] Step (4): moving the rubber material to an open mill for thinning and cooling to room temperature to obtain a rubber material for preparing a rubber hose for an immersion liquid cooling system.

[0018] Another object of the present invention is to provide a rubber hose for an immersion liquid cooling system, which comprises, from the inside to the outside, an inner rubber layer, a first reinforcement layer, a middle rubber layer, a second reinforcement layer, and an outer rubber layer; the inner rubber layer, the middle rubber layer, and the outer rubber layer are all made by extruding the rubber material; the first reinforcement layer and the second reinforcement layer are both wound by polyester thread.

[0019] The thickness of the inner rubber layer is 1.5 to 2.5 mm; the thickness of the middle rubber layer is 0.3 to 0.5 mm; the thickness of the outer rubber layer is 1.0 to 2.0 mm; the first reinforcement layer is formed by winding 12+12 spindles and 1 strand of polyester thread, and the lead of the first reinforcement layer is 35±5 mm; the second reinforcement layer is formed by winding 12+12 spindles and 1 strand of polyester thread, and the lead of the second reinforcement layer is 35±5 mm.

[0020] The polyester thread is 840D to 1000D polyester thread. Specifically, the polyester thread is 840D polyester thread or 1000D polyester thread.

[0021] Another object of the present invention is to provide a method for preparing the rubber hose for the immersion liquid cooling system, comprising the following steps:

[0022] Step a, inserting the soft core shaft into the rubber extruder, and extruding the inner rubber layer under vacuum conditions to obtain the inner rubber layer tube blank;

[0023] Step b, inserting the inner rubber layer tube into a winding machine, winding a polyester thread on the outer surface of the inner rubber layer to form a first reinforcement layer, and obtaining a wound tube;

[0024] Step c, inserting the wound tube into a rubber extruder, and extruding a middle rubber layer on the outer surface of the reinforcement layer to obtain a middle rubber layer tube;

[0025] Step d, inserting the middle rubber layer tube into a winding machine, winding a polyester thread on the outer surface of the middle rubber layer to form a second reinforcement layer, and obtaining a wound tube;

[0026] Step e, inserting the wound tube into a rubber extruder, and extruding an outer rubber layer on the outer surface of the reinforcement layer to obtain a tube;

[0027] Step f, plastic-coating the tube blank and performing high-temperature steam vulcanization; the vulcanization temperature is 160°C ± 3°C, the vulcanization time is 40min ± 5min, and the vulcanization pressure is 0.56mpa ± 0.02MPa;

[0028] Step g: The product obtained by vulcanization is stripped and cored to obtain a rubber hose for an immersion liquid cooling system.

[0029] Beneficial effects of the present invention:

[0030] The rubber hose of the present invention has the advantages of being resistant to medium extraction, being soft and flexible, and having a long service life. It is suitable for use in data center immersion liquid cooling systems and can ensure the long-term, safe, and reliable operation of the liquid cooling system.

[0031] The NBR / PVC rubber used in the present invention has excellent ozone and weathering resistance. Its molecular chains are more densely packed, resulting in reduced porosity and significantly improved coolant barrier properties. Furthermore, the chlorine content in the NBR / PVC molecules significantly enhances the material's flame retardancy.

[0032] The antioxidants ECOSCINOX 1010 and ECOSCINOX 1076 used in the present invention have good compatibility with NBR / PVC rubber, are not easy to volatilize, and have good extraction resistance; at the same time, they can improve the processing stability and long-term thermal stability of the rubber.

[0033] The reinforcing layer of this invention is made of polyester yarn, a widely available material with low production costs and a stable supply. This overcomes the limitations of aramid and vinylon yarns, such as their high import costs. The use of polyester yarn and its winding structure ensures the rubber hose's collapse resistance and flexibility, making it suitable for applications with small bend radii while significantly improving the hose's overall performance and physical and mechanical properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic structural diagram of a rubber hose for an immersion liquid cooling system of the present invention.

[0035] Figure 1 In the diagram, 1-inner rubber layer, 2-first reinforcement layer, 3-middle rubber layer, 4-second reinforcement layer, 5-outer rubber layer. DETAILED DESCRIPTION

[0036] The technical solution of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Take the production of a rubber hose for an immersion liquid cooling system with an inner diameter × outer diameter of 6.0±0.4mm×15.0±0.5mm as an example.

[0038] Example 1

[0039] like Figure 1 As shown, a rubber hose for an immersion liquid cooling system comprises, from inside to outside, an inner rubber layer 1, a first reinforcement layer 2, a middle rubber layer 3, a second reinforcement layer 4 and an outer rubber layer 5.

[0040] The rubber materials used to prepare the inner, middle and outer rubber layers are all made of the following raw materials in parts by weight: 100 parts of NBR / PVC D703L rubber, 10 parts of N550 carbon black, 15 parts of white carbon black, 25 parts of silica powder, 15 parts of plasticizer DOS, 5 parts of zinc oxide, 1 part of stearic acid, 1.5 parts of antioxidant ECOSCINOX 1010, 1.5 parts of antioxidant ECOSCINOX 1076, 0.5 parts of sulfur, 1.5 parts of accelerator TBzTD, 1.5 parts of accelerator DM, and 1.5 parts of accelerator CZ.

[0041] The rubber compound used to prepare the inner, middle and outer rubber layers is prepared by the following method, the steps are as follows:

[0042] Step (1), the internal mixer is cooled by water, the temperature of the internal mixer working room is controlled to be no more than 60° C., NBR / PVC rubber D703L (base material), zinc oxide, stearic acid, antioxidant ECOSCINOX 1010, antioxidant ECOSCINOX 1076 and silicon powder are added, and mixing is carried out for 90 seconds;

[0043] Step (2), add DOS (plasticizer), N550 carbon black and white carbon black, and mix for 5 minutes;

[0044] Step (3), adding sulfur S (vulcanizing agent), accelerator TBzTD, accelerator DM and accelerator CZ, mixing, and discharging the rubber material after the temperature reaches 110°C;

[0045] Step (4): moving the rubber material to an open mill to thinly sheet the material, cooling the material to room temperature, and obtaining the rubber material for preparing the inner, middle and outer rubber layers.

[0046] The preparation method of the rubber hose for the immersion liquid cooling system of this embodiment comprises the following steps:

[0047] Step a, inserting the soft mandrel into a rubber extruder, and extruding an inner rubber layer at a pressure of less than -0.06 MPa, wherein the thickness of the inner rubber layer is 2.0 mm, to obtain an inner rubber layer tube blank;

[0048] Step b, inserting the inner rubber layer tube into the winding machine, and winding 1000D polyester thread on the outer surface of the inner rubber layer to form a first reinforcement layer, the winding method is: winding with 12+12 spindles and 1 strand of 1000D polyester thread, with a lead of 30.0mm, to obtain a wound tube blank;

[0049] Step c, inserting the winding tube into a rubber extruder, extruding a middle rubber layer on the outer surface of the reinforcement layer, wherein the thickness of the middle rubber layer is 0.4 mm, to obtain a middle rubber layer tube;

[0050] Step d, inserting the middle rubber layer tube into the winding machine, and winding 1000D polyester thread on the outer surface of the middle rubber layer to form a second reinforcement layer. The winding method is: winding is made by using 12+12 spindles and 1 strand of 1000D polyester thread with a lead of 30.0 mm to obtain a wound tube blank;

[0051] Step e, inserting the wound tube into a rubber extruder, extruding an outer rubber layer on the outer surface of the reinforcement layer, wherein the thickness of the outer rubber layer is 1.5 mm, to obtain a tube;

[0052] Step f, wrap the tube blank with TPX plastic, set the vulcanization temperature to 160°C ± 3°C, the vulcanization time to 40min ± 5min, and the vulcanization pressure to 0.56mpa ± 0.02MPa, and perform high-temperature steam vulcanization;

[0053] Step g: The product obtained by vulcanization is stripped and cored to obtain a rubber hose for an immersion liquid cooling system.

[0054] The first reinforcement layer and the second reinforcement layer are both formed by winding 1000D polyester wire with 12+12 spindles and 1 strand, and the lead is 30.0 mm.

[0055] Example 2

[0056] The structure and preparation method of the rubber hose of this embodiment are the same as those of Example 1, except that the specifications of the polyester yarns used in the first and second reinforcement layers of the rubber hose are both adjusted to 840D.

[0057] Example 3

[0058] The structure and preparation method of the rubber hose of this embodiment are the same as those of Example 1, except that the leads of the first reinforcement layer and the second reinforcement layer of the rubber hose are both adjusted to 40.0 mm.

[0059] Comparative Example 1

[0060] Compared with Example 1, the first reinforcement layer and the second reinforcement layer of the rubber hose are both adjusted to a 24-spindle-1-strand braided structure, and the rest are the same as Example 1.

[0061] Comparative Example 2

[0062] Compared with Example 1, the materials of the first reinforcement layer and the second reinforcement layer of the rubber hose are adjusted to 1000D aramid yarn, and the rest are the same as Example 1.

[0063] Comparative Example 3

[0064] Compared with Example 1, the antioxidant ECOSCINOX 1010 in the rubber materials used to prepare the inner, middle and outer rubber layers was replaced by an equal amount of antioxidant RD, and the antioxidant ECOSCINOX 1076 was replaced by an equal amount of antioxidant 4010NA. The rest was the same as Example 1.

[0065] Comparative Example 4

[0066] Compared with Example 1, Comparative Example 3 is an existing liquid cooling system rubber hose, the inner rubber layer is made of ethylene propylene diene monomer (EPDM) rubber, the outer rubber layer is made of EPDM rubber, and there is only one reinforcement layer between the inner rubber layer and the outer rubber layer, which is a polyester braided structure.

[0067] The properties of the rubber hoses of Examples 1 to 3 and Comparative Examples 1 and 2 are shown in Table 1.

[0068] Table 1. Rubber hose properties

[0069]

[0070]

[0071] Note: Undated references to national standards indicate the latest version. The test oil for the pulse test is ExxonMobil 3220; the medium is ExxonMobil 3220.

[0072] Compared to the rubber hose in Example 1, the two reinforcing layers of the rubber hose in Comparative Example 1 were both braided, resulting in lower bending resistance and poor flexural properties, making it unsuitable for piping in extremely confined spaces. Compared to the rubber hose in Example 1, the two reinforcing layers of the rubber hose in Comparative Example 2 were made of aramid. Although the flexural properties met the requirements, the flexural resistance test data was significantly lower. This is because aramid is more rigid than polyester, resulting in a decrease in the bending fatigue resistance of the hose in Comparative Example 2. Furthermore, the bonding strength between the layers of the hose made with aramid yarn is significantly reduced, which in turn shortens the hose's lifespan and increases its cost. In Comparative Example 3, after replacing the antioxidants ECOSCINOX 1010 and ECOSCINOX 1076 in the rubber compound of the inner, middle, and outer rubber layers with equal amounts of antioxidants RD and 4010NA, the rubber compound exhibited poor compatibility with ExxonMobil 3220 oil, failing to meet the technical requirements for use. Comparative Example 4, using EPDM rubber as the rubber compound, exhibited precipitation in ExxonMobil 3220 oil, affecting the system's cooling performance. Furthermore, the resulting hose's pulse performance did not meet the required standards. In summary, the rubber hose for an immersion liquid cooling system of the present invention exhibits resistance to medium extraction, flexibility, and a long lifespan, thereby resolving the installation difficulties associated with the limited space surrounding the liquid cooling system.

[0073] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the scope of protection of the present invention in any form, and any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rubber compound for preparing a rubber hose for an immersion liquid cooling system, characterized in that: It is made of the following raw materials in parts by weight: 100 parts of NBR / PVC rubber, 10-15 parts of N550 carbon black, 15-25 parts of white carbon black, 25-35 parts of silicon micropowder, 10-20 parts of plasticizer, 5 parts of zinc oxide, 1 part of stearic acid, 2-4 parts of antioxidant, 0.3-0.8 parts of sulfur, and 3-5 parts of accelerator.

2. The rubber compound for preparing a rubber hose for an immersion liquid cooling system according to claim 1, characterized in that: It is made of the following raw materials in parts by weight: 100 parts of NBR / PVC rubber, 10 parts of N550 carbon black, 15 parts of white carbon black, 25 parts of silicon micropowder, 15 parts of plasticizer, 5 parts of zinc oxide, 1 part of stearic acid, 3 parts of antioxidant, 0.5 parts of sulfur, and 4.5 parts of accelerator.

3. The rubber compound for preparing a rubber hose for an immersion liquid cooling system according to claim 1 or 2, characterized in that: The Mooney viscosity ML (1+4) of the NBR / PVC rubber at 100 DEG C is 65-80, the content of acrylonitrile is 30-40%, and the weight ratio of NBR to PVC is 70:

30.

4. The rubber compound for preparing a rubber hose for an immersion liquid cooling system according to claim 1, characterized in that: The plasticizer is one or a combination of RS107, TP95 or DOS.

5. The rubber compound for preparing a rubber hose for an immersion liquid cooling system according to claim 1, characterized in that: The antioxidant is one or a combination of ECOSCINOX 1010, ECOSCINOX 168 or ECOSCINOX 1076; the accelerator is one or more of accelerator TBzTD, accelerator DM, accelerator CZ and accelerator TET.

6. The rubber compound for preparing a rubber hose for an immersion liquid cooling system according to claim 5, characterized in that: The antioxidant is a combination of ECOSCINOX 1010 and ECOSCINOX 1076 in a weight ratio of 1:1; the accelerator is a combination of accelerator TBzTD, accelerator DM and accelerator CZ in a weight ratio of 1:1:

1.

7. A rubber hose for an immersion liquid cooling system, characterized in that: From the inside to the outside, it includes an inner rubber layer, a first reinforcement layer, a middle rubber layer, a second reinforcement layer, and an outer rubber layer; the inner rubber layer, the middle rubber layer, and the outer rubber layer are all made by extruding the rubber material according to claim 1; the first reinforcement layer and the second reinforcement layer are both wound by polyester thread.

8. The rubber hose for an immersion liquid cooling system according to claim 7, characterized in that: The thickness of the inner rubber layer is 1.5 to 2.5 mm; the thickness of the middle rubber layer is 0.3 to 0.5 mm; the thickness of the outer rubber layer is 1.0 to 2.0 mm; the first reinforcement layer is formed by winding 12+12 spindles and 1 strand of polyester thread, and the lead of the first reinforcement layer is 35±5 mm; the second reinforcement layer is formed by winding 12+12 spindles and 1 strand of polyester thread, and the lead of the second reinforcement layer is 35±5 mm.

9. The rubber hose for an immersion liquid cooling system according to claim 7, characterized in that: The polyester thread is 840D-1000D polyester thread.

10. A method for preparing the rubber hose for an immersion liquid cooling system according to claim 7, characterized in that: Here are the steps: Step a, inserting the soft core shaft into the rubber extruder, and extruding the inner rubber layer under vacuum conditions to obtain the inner rubber layer tube blank; Step b, inserting the inner rubber layer tube into a winding machine, winding a polyester thread on the outer surface of the inner rubber layer to form a first reinforcement layer, and obtaining a wound tube; Step c, inserting the winding tube into a rubber extruder, and extruding a middle rubber layer on the outer surface of the reinforcement layer to obtain a middle rubber layer tube; Step d, inserting the middle rubber layer tube into a winding machine, winding a polyester thread on the outer surface of the middle rubber layer to form a second reinforcement layer, and obtaining a wound tube; Step e, inserting the wound tube into a rubber extruder, and extruding an outer rubber layer on the outer surface of the reinforcement layer to obtain a tube; Step f, plastic-coating the tube blank and performing high-temperature steam vulcanization; the vulcanization temperature is 160°C ± 3°C, the vulcanization time is 40min ± 5min, and the vulcanization pressure is 0.56mpa ± 0.02MPa; Step g: The product obtained by vulcanization is stripped and cored to obtain a rubber hose for an immersion liquid cooling system.

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