Ethylene propylene diene monomer rubber sealing ring material for liquid cooling system and preparation method therefor

Abstract

An ethylene propylene diene monomer rubber sealing ring material for a liquid cooling system and a preparation method therefor. The material comprises the following components in parts by weight: 100 parts of ethylene propylene diene monomer rubber, 70-90 parts of carbon black, 0.5-1.5 parts of an internal release agent, and 7-9 parts of a peroxide cross-linking agent, wherein the carbon black is made up of 40-50 parts of furnace carbon black and 30-40 parts of thermal cracking carbon black in combination. The preparation method comprises: 1. weighing the ethylene propylene diene monomer, the furnace carbon black, the thermal cracking carbon black, and the internal release agent on the basis of the above parts by weight, sequentially carrying out first mixing and first tight milling, and upon completion of the first tight milling, sheeting out the mixed material and then cooling the resulting material to room temperature to obtain a masterbatch; 2. weighing the peroxide cross-linking agent and the masterbatch, sequentially carrying out second mixing and second tight milling, and upon completion of the second tight milling, sheeting out the mixed material to obtain blanks; and 3. sequentially vulcanizing the blanks, and then cooling to obtain an ethylene propylene diene monomer rubber sealing material for a liquid cooling system. The material has excellent processability and liquid-cooling medium resistance; and the preparation method is simple and convenient to operate and beneficial to industrial production.

Description

An EPDM rubber sealing ring material for liquid cooling system and preparation method thereof Technical Field

[0001] The invention belongs to the technical field of rubber materials, and particularly relates to an EPDM rubber sealing ring material for a liquid cooling system and a preparation method thereof. Background Art

[0002] Rubber sealing products for liquid cooling systems play a key role as their application expands into emerging fields such as data centers, new energy vehicles, 5G base stations, energy storage, and artificial intelligence. These rubber sealing products are primarily used for sealing liquid cooling systems and come into direct contact with the cooling medium. Liquid cooling media primarily fall into two categories: aqueous refrigerants such as ethylene glycol and propylene glycol, and fluorocarbon compounds such as fluorocarbon olefins, fluorocarbon alkanes, perfluoropolyethers, and perfluorohexanone.

[0003] With the rapid development of emerging sectors such as data centers, 5G base stations, energy storage, and new energy vehicles, the demand for heat exchange is increasing rapidly. Liquid cooling heat exchange technology is being widely used, and the maintenance costs of cold plate connectors and pipelines have increased dramatically, leading manufacturers to place higher demands on rubber seals for liquid cooling systems. Rubber seals for liquid cooling systems come into direct contact with the coolant medium, including ethylene glycol-based aqueous media and fluorocarbon compounds. These seals require excellent resistance to media aging and the extraction of no small molecules from the media to avoid coolant contamination. The high maintenance costs require seals with long service life, low compression set within the operating temperature range of -45-90°C, and a small volume change rate after at least 10 temperature cycles.

[0004] Liquid cooling system seal failure and coolant leakage are not only related to material properties but also to seal appearance, groove dimensional design, sealing surface machining accuracy, and assembly process. The appearance quality of rubber seals is particularly critical. The relatively low molecular weight of the coolant medium places higher demands on seal appearance quality. Therefore, the rubber compound used to produce liquid cooling system seals requires superior processing properties to meet product production requirements and achieve high-quality seals. Summary of the Invention

[0005] The object of the present invention is to provide an EPDM rubber sealing ring material for a liquid cooling system and a preparation method thereof. The material of the present invention has excellent processing properties and resistance to liquid cooling media, thereby improving the sealing effect of the sealing product; the preparation method of the present invention is simple to operate and is conducive to industrial production.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the present invention is an EPDM rubber sealing ring material for a liquid cooling system and a preparation method thereof, comprising the following components in parts by weight: 100 parts of EPDM rubber, 70-90 parts of carbon black, 0.5-1.5 parts of an internal release agent, and 7-9 parts of a peroxide crosslinking agent, wherein the carbon black is a combination of 40-50 parts of furnace carbon black and 30-40 parts of thermal cracking carbon black.

[0007] Furthermore, the EPDM rubber has a Mooney viscosity of ML (1+4) 125° C. ≤ 35, an ethylene content of 45-60%, and a raw rubber having ENB as the third monomer, with an ENB content of 6-9%.

[0008] Furthermore, the internal release agent is Rheinland-18, Rheinland-42 or Modli 935P.

[0009] Furthermore, the peroxide cross-linking agent is dicumyl peroxide, odorless DCP or dicumyl peroxide.

[0010] Furthermore, the preparation method of the EPDM rubber sealing ring material for the liquid cooling system comprises the following steps:

[0011] Step 1: Weigh 100 parts of EPDM rubber, 40-50 parts of furnace carbon black, 30-40 parts of thermal cracking carbon black and 0.05-0.15 parts of internal release agent in parts by weight, and perform first mixing and first thin pass in sequence. After the first thin pass is completed, the mixture is sheeted and then cooled to room temperature to obtain a masterbatch;

[0012] Step 2: Weigh 7-10 parts of peroxide crosslinking agent and carry out second mixing and second thinning with the masterbatch in sequence. After the second thinning is completed, the mixture is sheeted to obtain a blank of EPDM rubber sealing material for liquid cooling system.

[0013] Furthermore, the preparation method further comprises sequentially subjecting the blank to a first vulcanization and a second vulcanization with gradually increasing temperature, and cooling after the second vulcanization to obtain an EPDM rubber sealing material for a liquid cooling system.

[0014] Furthermore, the first vulcanization in step three is carried out in a flat-plate vulcanizer, and the blank is placed in the flat-plate vulcanizer and kept warm for 5-15 minutes at a temperature of 160-180° C. and a pressure of 8-15 MPa.

[0015] Furthermore, the second vulcanization in step three is carried out in an electric heating blast box, the blank is placed in the electric heating blast box and kept warm at 90-120° C. for 1-2 hours, and then heated to 150-180° C. and kept warm for 2-4 hours.

[0016] Furthermore, in the step 1, the first mixing temperature is no more than 80° C., the time is 30-40 minutes, and the number of first thin passes is 4-8 times.

[0017] Furthermore, in the step 2, the second mixing temperature is no more than 60° C., the time is 15-20 minutes, and the second thin-pass number is 4-6 times.

[0018] The liquid cooling system described in the present invention uses EPDM rubber sealing ring material, which is used for sealing cold plate or immersion liquid cooling systems such as data centers, 5G base stations, and new energy vehicles.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) The rubber sealing ring material of the present invention is mainly used for sealing of liquid cooling systems. To ensure the sealing properties of the material, a raw rubber grade in which the third monomer is ENB is selected, with an ENB content of 6-9% and an ethylene content of 45-60%, is selected to ensure the material's vulcanization speed, sealing properties, and low-temperature rebound.

[0021] (2) The rubber sealing ring material of the present invention is primarily used for sealing liquid cooling systems and is in direct contact with the liquid cooling medium. No softening oil is added during the preparation process to prevent the material from extracting low-molecular substances in the liquid cooling medium and contaminating the liquid cooling medium, thereby improving the material's resistance to liquid cooling medium. When no softening oil is added, the raw rubber Mooney viscosity ML (1+4) is selected to be 125°C ≤ 35 to ensure carbon black filling and prevent excessive material viscosity from affecting processability.

[0022] (3) In the preparation process, furnace carbon black and thermal cracking carbon black are used together. On the one hand, the reinforcing effect of the filler is guaranteed, and on the other hand, the processability of the material production process can be adjusted to compensate for the deterioration of processability caused by the lack of softening oil. Furnace carbon black has good reinforcing properties and can improve the hardness, tensile strength, tear strength, and tensile stress of the vulcanized rubber, but the permanent deformation, rebound and dynamic properties deteriorate. At the same time, as the amount of addition increases, the mixing time of carbon black is long, the dispersion is poor, the power consumption is high, and the viscosity of the material increases. These problems are significant. Thermal cracking carbon black with low reinforcement does not significantly increase the hardness and viscosity of the rubber compound, can be filled in large quantities, and has good rebound resilience and dynamic properties, which is beneficial to improving the compression permanent deformation characteristics of the sealing material.

[0023] (4) The rubber sealing material for the liquid cooling system of the present invention uses a combination of furnace carbon black and thermal black. 40-50 parts of furnace carbon black has excellent reinforcing properties, ensuring that the material has excellent mechanical strength; and 30-40 parts of thermal black improves the material's compression set, resilience, and dynamic properties, ensuring excellent processing performance.

[0024] (5) The rubber sealing ring material components of the present invention use peroxide as a cross-linking vulcanizing agent. The vulcanization system has good heat resistance, resilience, and low compression set and medium extract content, but the vulcanization system has the disadvantages of short burning time, long vulcanization time, and poor hot tear strength. The present invention optimizes the type and amount of peroxide vulcanizing agent to ensure a good mold vulcanization production process, and through the filler ratio, ensures good mechanical strength to meet the high appearance and dimensional quality requirements of the product.

[0025] (6) The preparation method of the present invention is simple to operate and can be applied to industrial production by increasing the use of carbon black types and removing the addition of softening oil in the conventional method. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below with reference to specific embodiments.

[0027] The invention provides an EPDM rubber sealing ring material for a liquid cooling system. The material comprises the following components in parts by weight: 100 parts of EPDM rubber, 70-90 parts of carbon black, 0.5-1.5 parts of an internal release agent, and 7-9 parts of a peroxide crosslinking agent, wherein the carbon black is a combination of 40-50 parts of furnace carbon black and 30-40 parts of thermal cracking carbon black.

[0028] It should be noted that the EPDM rubber in the present invention adopts a low Mooney, and the third monomer is a raw rubber brand of ENB, wherein the Mooney ML (1+4) 125°C ≤ 35, which is beneficial to filler filling while compensating for the process problems caused by the addition of no softening oil. A higher content of the third monomer (6-9%) is selected to increase the vulcanization speed and compensate for the poor material performance caused by the low Mooney molecular chain; carbon black adopts furnace carbon black with better reinforcement, such as N550, N774, etc., to improve the hardness, tensile strength, tear strength, etc. of the material, and thermal cracking carbon black is used to compensate for the defects of permanent deformation, rebound and deterioration of dynamic properties caused by furnace carbon black; the internal release agent can be an internal release agent of fatty alcohol or fatty ester well known to those skilled in the art; the type of peroxide crosslinking agent is not particularly limited, and a peroxide crosslinking agent well known to those skilled in the art can be used.

[0029] The EPDM rubbers used in the following embodiments of the present invention are ARLANXEO Keltan 2650, Keltan 2750, and Keltan 6950 EPDM rubbers; the carbon blacks are N774, N550, SP5000, and N990 from Cabot Chemical (Tianjin) Co., Ltd., wherein the furnace blacks are N774, N550, and SP5000, and the thermal black is N990; the internal mold release agents are Rheinsol-18 and Rheinsol-42 from Rhein Chemie Co., Ltd. and Moldli 935P from Qingdao Angji Rubber & Plastics; and the peroxide crosslinking agents are dicumyl peroxide (DCP), odorless DCP, and diisopropylbenzene peroxide (DCP) from Tianjin Akzo Nobel Peroxide Co., Ltd.

[0030] Example 1 A method for preparing an EPDM rubber sealing ring material for a liquid cooling system comprises the following steps:

[0031] Step 1: Weigh 100g of ARLANXEO Keltan 2650 raw rubber, 50g of N774 carbon black, 30g of N990 carbon black, and 1.0g of Rheinland-42, mix the above materials at 70°C for 35 minutes, then thin-pass the mixture six times, sheet the mixture, and cool it to room temperature to obtain a masterbatch;

[0032] Step 2: Weigh 8.5 g of dicumyl peroxide and mix it with the masterbatch at a temperature of 45°C for 18 minutes, then thin it 5 times, and then sheet the mixture to obtain a blank;

[0033] Step 3: Place the blank in a flat vulcanizer and keep it warm at 175°C and 10 MPa for 8 minutes. Then place it in an electric blower and keep it warm at 110°C for 1 hour. Then continue to heat it to 150°C and keep it warm for 2 hours. Finally, heat it to 180°C and keep it warm for 1 hour. After completion, cool it to obtain the EPDM rubber sealing ring material for the liquid cooling system.

[0034] Example 2 A method for preparing an EPDM rubber sealing ring material for a liquid cooling system, comprising the following steps:

[0035] Step 1: Weigh 100g of ARLANXEO Keltan 2750 raw rubber, 45g of N774 carbon black, 40g of N990 carbon black, and 1.2g of Rheinland-42, mix the above materials at 70°C for 35 minutes, then thin-pass through 6 times, sheet the mixture, and cool it to room temperature to obtain a masterbatch;

[0036] Step 2: Weigh 8.0 g of dicumyl peroxide and mix it with the masterbatch at a temperature of 45°C for 18 minutes, then thin it 5 times, and then sheet the mixture to obtain a blank;

[0037] Step 3: Place the blank in a flat vulcanizer and keep it warm at 175°C and 12MPa for 8 minutes, then place it in an electric blower and keep it warm at 100°C for 1 hour, then continue to heat it to 150°C and keep it warm for 4 hours. After completion, cool it to obtain the EPDM rubber sealing ring material for the liquid cooling system.

[0038] Example 3 A method for preparing an EPDM rubber sealing ring material for a liquid cooling system, comprising the following steps:

[0039] Step 1: Weigh 80g of ARLANXEO Keltan 2650 raw rubber, 20g of Keltan 6950 raw rubber, 40g of N550 carbon black, 36g of N990 carbon black, and 0.8g of Rheinland-42, and mix the above materials at 60°C for 40 minutes, then thin-pass the mixture six times, sheet out, and then cool to room temperature to obtain a masterbatch;

[0040] Step 2: Weigh 7.8 g of dicumyl peroxide and mix it with the masterbatch at 40°C for 20 minutes, then thin it 5 times, and then sheet the mixture to obtain a blank;

[0041] Step 3: Place the blank in a flat vulcanizer and keep it warm at 175°C and 8MPa for 10 minutes. Then place it in an electric blower and keep it warm at 100°C for 1 hour. Then continue to heat it to 150°C and keep it warm for 1 hour. Finally, heat it to 180°C and keep it warm for 2 hours. After completion, cool it to obtain the EPDM rubber sealing ring material for the liquid cooling system.

[0042] Example 4 A method for preparing an EPDM rubber sealing ring material for a liquid cooling system comprises the following steps:

[0043] Step 1: Weigh 100g of ARLANXEO Keltan 2750 raw rubber, 43g of SP5000 carbon black, 38g of N990 carbon black, and 1.5g of Moldline 935P. Mix the above materials at 80°C for 30 minutes, then thin-pass the mixture four times. Sheet the mixture and cool it to room temperature to obtain a masterbatch.

[0044] Step 2: Weigh 7.8g of odorless DCP and mix it with the masterbatch at 50°C for 17 minutes, then thin it 6 times, and then sheet the mixture to obtain a blank;

[0045] Step 3: Place the blank in a flat vulcanizer and keep it warm at 170°C and 10 MPa for 6 minutes, then place it in an electric blower and keep it warm at 90°C for 2 hours, then continue to heat it to 180°C and keep it warm for 2 hours. After completion, cool it to obtain EPDM rubber sealing ring material for liquid cooling system.

[0046] Example 5 A method for preparing an EPDM rubber sealing ring material for a liquid cooling system, comprising the following steps:

[0047] Step 1: Weigh 100g of ARLANXEO Keltan 2650 raw rubber, 48g of N550 carbon black, 32g of N990 carbon black, and 0.5g of Rheinland-18, mix the above materials at 75°C for 40 minutes, then thin-pass the mixture 8 times, sheet the mixture, and cool it to room temperature to obtain a masterbatch;

[0048] Step 2: Weigh 7.0 g of double 25 and mix it with the masterbatch at a temperature of 48°C for 15 minutes, then thin it 4 times, and then sheet the mixture to obtain a blank;

[0049] Step 3: Place the blank in a flat vulcanizer and keep it warm at 185°C and 11 MPa for 5 minutes. Then place it in an electric blower and keep it warm at 120°C for 1.5 hours. Then continue to heat it to 170°C and keep it warm for 3 hours. After completion, cool it to obtain EPDM rubber sealing ring material for liquid cooling system.

[0050] Comparative Example 1

[0051] Step 1: Weigh 100g of ARLANXEO Keltan 6950 raw rubber, 80g of N550 carbon black, 2.0g of Rheinland-42, and 20g of paraffin mineral softening oil, mix the above materials at 80°C for 30 minutes, then thin-pass the mixture six times, sheet the mixture, and cool it to room temperature to obtain a masterbatch;

[0052] Step 2: Weigh 8.5 g of dicumyl peroxide and mix it with the masterbatch at a temperature of 50°C for 15 minutes, then thin it 5 times, and then sheet the mixture to obtain a blank;

[0053] Step 3: Place the blank in a flat vulcanizer and keep it warm at 170°C and 10 MPa for 10 minutes. Then place it in an electric blower and keep it warm at 100°C for 2 hours. Then continue to heat it to 150°C and keep it warm for 4 hours. After completion, cool it to obtain the sealing material.

[0054] Comparative Example 2

[0055] Step 1: Weigh 100g of ARLANXEO Keltan 2650 rubber, 70g of N550 carbon black, 1.5g of Rheinland-42, and 18g of paraffin mineral softening oil. Mix the above materials at 80°C for 30 minutes, then thin-pass the mixture six times. Sheet the mixture and cool it to room temperature to obtain a masterbatch.

[0056] Step 2: Weigh 9.0 g of dicumyl peroxide and mix it with the masterbatch at a temperature of 50°C for 15 minutes, then thin it 5 times, and then sheet the mixture to obtain a blank;

[0057] Step 3: Place the blank in a flat vulcanizer and keep it warm at 180°C and 8MPa for 5 minutes. Then place it in an electric blower and keep it warm at 100°C for 2 hours. Then continue to heat it to 150°C and keep it warm for 2 hours. Finally, heat it to 180°C and keep it warm for 1 hour. After completion, cool it to obtain the sealing material.

[0058] Comparative Example 3

[0059] Step 1: Weigh 100g of ARLANXEO Keltan 2650 raw rubber, 80g of N990 carbon black, and 20.8g of Rheinland Powder-420, mix the above materials at 60°C for 40 minutes, then thin-pass the mixture six times, sheet the mixture, and cool it to room temperature to obtain a masterbatch;

[0060] Step 2: Weigh 7.5 g of dicumyl peroxide and mix it with the masterbatch at 40°C for 20 minutes, then thin it 5 times, and then sheet the mixture to obtain a blank;

[0061] Step 3: Place the blank in a flat vulcanizer and keep it warm at 175°C and 8MPa for 10 minutes. Then place it in an electric blower and keep it warm at 100°C for 1 hour. Then continue to heat it to 150°C and keep it warm for 1 hour. Finally, heat it to 180°C and keep it warm for 2 hours. After completion, cool it to obtain the sealing material.

[0062] Comparative Example 4

[0063] Step 1: Weigh 100g of ARLANXEO Keltan 2650 raw rubber, 60g of N550 carbon black, and 0.5g of Rheinland Powder 180g, mix the above materials at 75°C for 40 minutes, then thin-pass the mixture 8 times, sheet the mixture, and cool it to room temperature to obtain a masterbatch;

[0064] Step 2: Weigh 7.0g of double 25 and mix it with the masterbatch at a temperature of 48°C for 15 minutes, then thin it 4 times, and then sheet the mixture to obtain the EPDM rubber sealing ring material blank for the liquid cooling system;

[0065] Step 3: Place the blank in a flat vulcanizer and keep it warm at 185°C and 11MPa for 5 minutes, then place it in an electric blower and keep it warm at 120°C for 1.5 hours, then continue to heat it to 170°C and keep it warm for 3 hours. After completion, cool it to obtain an EPDM rubber sealing ring for the liquid cooling system.

[0066] Experimental part

[0067] The performance tests of the materials prepared in Examples 1-5 and Comparative Examples 1-4 were conducted, as follows:

[0068] Cold resistance (low temperature shrinkage TR10) is tested according to GB / T 7758-2002;

[0069] Heat resistance (hot air compression permanent deformation) is tested in accordance with GB / T 7759.1-2015 (130℃×72h);

[0070] High and low temperature cycle test: complete 10 cycles of test in the temperature range of -45 to 90°C, volume change rate;

[0071] The test results are shown in Table 1:

[0072] Table 1

[0073] Appearance quality refers to GB / T 3452.2-2007-S grade requirements;

[0074] The test results are shown in Table 2:

[0075] Table 2

[0076] As can be seen from Table 1, the EPDM rubber sealing ring material for the liquid cooling system provided by the present invention has excellent resistance to liquid cooling media, heat resistance, cold resistance, and aging resistance and resilience, and can effectively ensure the airtightness requirements during use. By controlling the amount of softener and carbon black reinforcement, the mechanical strength and service life of the material are guaranteed while avoiding the problem of various coolant media extracting small molecules and contaminating the coolant medium.

[0077] As can be seen from Table 2, the product qualification rate of the preparation method of the present invention has been significantly improved, effectively ensuring the high appearance quality requirements of rubber sealing products for liquid cooling systems. At the same time, it can greatly improve production efficiency and reduce production costs.

[0078] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An EPDM rubber sealing ring material for a liquid cooling system, characterized in that: The invention comprises the following components in parts by weight: 100 parts of EPDM rubber, 70-90 parts of carbon black, 0.5-1.5 parts of internal mold release agent, and 7-9 parts of peroxide crosslinking agent, wherein the carbon black is a combination of 40-50 parts of furnace carbon black and 30-40 parts of thermal cracking carbon black.

2. The EPDM rubber sealing ring material for liquid cooling system according to claim 1, characterized in that: The EPDM rubber is a raw rubber with a Mooney viscosity of ML (1+4) 125° C. ≤ 35, an ethylene content of 45-60%, and an ENB as the third monomer, with an ENB content of 6-9%.

3. The EPDM rubber sealing ring material for liquid cooling system according to claim 1, characterized in that: The internal mold release agent is Rheinland-18, Rheinland-42 or Modli 935P.

4. The EPDM rubber sealing ring material for a liquid cooling system according to claim 1, wherein: The peroxide cross-linking agent is dicumyl peroxide, odorless DCP or dicumyl peroxide.

5. The method for preparing the EPDM rubber sealing ring material for the liquid cooling system according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: Weigh 100 parts of EPDM rubber, 40-50 parts of furnace carbon black, 30-40 parts of thermal cracking carbon black and 0.5-1.5 parts of internal release agent in parts by weight, and perform first mixing and first thin pass in sequence. After the first thin pass is completed, the mixture is sheeted and then cooled to room temperature to obtain a masterbatch; Step 2: Weigh 7-10 parts of peroxide crosslinking agent and carry out second mixing and second thinning with the masterbatch in sequence. After the second thinning is completed, the mixture is sheeted to obtain a blank of EPDM rubber sealing material for liquid cooling system.

6. The method for preparing the EPDM rubber sealing ring material for a liquid cooling system according to claim 5, characterized in that: The method also includes sequentially subjecting the blank to a first vulcanization and a second vulcanization with gradually increasing temperature, and cooling the blank after the second vulcanization is completed to obtain an EPDM rubber sealing material for a liquid cooling system.

7. The method for preparing the EPDM rubber sealing ring material for a liquid cooling system according to claim 6, wherein: The first vulcanization in the step 3 is carried out in a flat-plate vulcanizer, and the blank is placed in the flat-plate vulcanizer and kept warm for 5-15 minutes under the conditions of a temperature of 160-180° C. and a pressure of 8-15 MPa.

8. The method for preparing the EPDM rubber sealing ring material for a liquid cooling system according to claim 6, wherein: The second vulcanization in step 3 is carried out in an electric heating blast box. The blank is placed in the electric heating blast box and kept warm at 90-120° C. for 1-2 hours, and then heated to 150-180° C. and kept warm for 2-4 hours.

9. The method for preparing the EPDM rubber sealing ring material for a liquid cooling system according to claim 5, wherein: In the step 1, the first mixing temperature does not exceed 80° C., and the mixing time is 30-40 minutes; and the number of first thin passes is 4-8 times.

10. The method for preparing the EPDM rubber sealing ring material for a liquid cooling system according to claim 5, wherein: The second mixing temperature in step 2 is no more than 60°C and the mixing time is 15-20 minutes; The second thin pass number is 4-6 times.

11. The EPDM rubber sealing ring material for a liquid cooling system according to any one of claims 1 to 4 is used for sealing cold plate or immersion liquid cooling systems in data centers, 5G base stations, new energy vehicles, etc.

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